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authorLucaSas <sas.luca.alex@gmail.com>2021-11-04 16:14:58 +0200
committerLucaSas <sas.luca.alex@gmail.com>2021-11-04 16:14:58 +0200
commitd96b4ebce5ee6245fa80d27d41b67aa56555c912 (patch)
treef28cb388a14c4bd9da8f4b57b213eb1539fc5367 /libs/raylib/src/external/dr_flac.h
parent6bcb1207addb4afe041c94e68e23c77175164956 (diff)
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Changed the template to now download raylib instead of having it in the repo.
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diff --git a/libs/raylib/src/external/dr_flac.h b/libs/raylib/src/external/dr_flac.h
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-/*
-FLAC audio decoder. Choice of public domain or MIT-0. See license statements at the end of this file.
-dr_flac - v0.11.10 - 2019-06-26
-
-David Reid - mackron@gmail.com
-*/
-
-/*
-USAGE
-=====
-dr_flac is a single-file library. To use it, do something like the following in one .c file.
- #define DR_FLAC_IMPLEMENTATION
- #include "dr_flac.h"
-
-You can then #include this file in other parts of the program as you would with any other header file. To decode audio data,
-do something like the following:
-
- drflac* pFlac = drflac_open_file("MySong.flac");
- if (pFlac == NULL) {
- // Failed to open FLAC file
- }
-
- drflac_int32* pSamples = malloc(pFlac->totalPCMFrameCount * pFlac->channels * sizeof(drflac_int32));
- drflac_uint64 numberOfInterleavedSamplesActuallyRead = drflac_read_pcm_frames_s32(pFlac, pFlac->totalPCMFrameCount, pSamples);
-
-The drflac object represents the decoder. It is a transparent type so all the information you need, such as the number of
-channels and the bits per sample, should be directly accessible - just make sure you don't change their values. Samples are
-always output as interleaved signed 32-bit PCM. In the example above a native FLAC stream was opened, however dr_flac has
-seamless support for Ogg encapsulated FLAC streams as well.
-
-You do not need to decode the entire stream in one go - you just specify how many samples you'd like at any given time and
-the decoder will give you as many samples as it can, up to the amount requested. Later on when you need the next batch of
-samples, just call it again. Example:
-
- while (drflac_read_pcm_frames_s32(pFlac, chunkSizeInPCMFrames, pChunkSamples) > 0) {
- do_something();
- }
-
-You can seek to a specific sample with drflac_seek_to_sample(). The given sample is based on interleaving. So for example,
-if you were to seek to the sample at index 0 in a stereo stream, you'll be seeking to the first sample of the left channel.
-The sample at index 1 will be the first sample of the right channel. The sample at index 2 will be the second sample of the
-left channel, etc.
-
-
-If you just want to quickly decode an entire FLAC file in one go you can do something like this:
-
- unsigned int channels;
- unsigned int sampleRate;
- drflac_uint64 totalPCMFrameCount;
- drflac_int32* pSampleData = drflac_open_file_and_read_pcm_frames_s32("MySong.flac", &channels, &sampleRate, &totalPCMFrameCount);
- if (pSampleData == NULL) {
- // Failed to open and decode FLAC file.
- }
-
- ...
-
- drflac_free(pSampleData);
-
-
-You can read samples as signed 16-bit integer and 32-bit floating-point PCM with the *_s16() and *_f32() family of APIs
-respectively, but note that these should be considered lossy.
-
-
-If you need access to metadata (album art, etc.), use drflac_open_with_metadata(), drflac_open_file_with_metdata() or
-drflac_open_memory_with_metadata(). The rationale for keeping these APIs separate is that they're slightly slower than the
-normal versions and also just a little bit harder to use.
-
-dr_flac reports metadata to the application through the use of a callback, and every metadata block is reported before
-drflac_open_with_metdata() returns.
-
-
-The main opening APIs (drflac_open(), etc.) will fail if the header is not present. The presents a problem in certain
-scenarios such as broadcast style streams like internet radio where the header may not be present because the user has
-started playback mid-stream. To handle this, use the relaxed APIs: drflac_open_relaxed() and drflac_open_with_metadata_relaxed().
-
-It is not recommended to use these APIs for file based streams because a missing header would usually indicate a
-corrupted or perverse file. In addition, these APIs can take a long time to initialize because they may need to spend
-a lot of time finding the first frame.
-
-
-
-OPTIONS
-=======
-#define these options before including this file.
-
-#define DR_FLAC_NO_STDIO
- Disable drflac_open_file() and family.
-
-#define DR_FLAC_NO_OGG
- Disables support for Ogg/FLAC streams.
-
-#define DR_FLAC_BUFFER_SIZE <number>
- Defines the size of the internal buffer to store data from onRead(). This buffer is used to reduce the number of calls
- back to the client for more data. Larger values means more memory, but better performance. My tests show diminishing
- returns after about 4KB (which is the default). Consider reducing this if you have a very efficient implementation of
- onRead(), or increase it if it's very inefficient. Must be a multiple of 8.
-
-#define DR_FLAC_NO_CRC
- Disables CRC checks. This will offer a performance boost when CRC is unnecessary.
-
-#define DR_FLAC_NO_SIMD
- Disables SIMD optimizations (SSE on x86/x64 architectures). Use this if you are having compatibility issues with your
- compiler.
-
-
-
-QUICK NOTES
-===========
-- dr_flac does not currently support changing the sample rate nor channel count mid stream.
-- Audio data is output as signed 32-bit PCM, regardless of the bits per sample the FLAC stream is encoded as.
-- This has not been tested on big-endian architectures.
-- dr_flac is not thread-safe, but its APIs can be called from any thread so long as you do your own synchronization.
-- When using Ogg encapsulation, a corrupted metadata block will result in drflac_open_with_metadata() and drflac_open()
- returning inconsistent samples.
-*/
-
-#ifndef dr_flac_h
-#define dr_flac_h
-
-#include <stddef.h>
-
-#if defined(_MSC_VER) && _MSC_VER < 1600
-typedef signed char drflac_int8;
-typedef unsigned char drflac_uint8;
-typedef signed short drflac_int16;
-typedef unsigned short drflac_uint16;
-typedef signed int drflac_int32;
-typedef unsigned int drflac_uint32;
-typedef signed __int64 drflac_int64;
-typedef unsigned __int64 drflac_uint64;
-#else
-#include <stdint.h>
-typedef int8_t drflac_int8;
-typedef uint8_t drflac_uint8;
-typedef int16_t drflac_int16;
-typedef uint16_t drflac_uint16;
-typedef int32_t drflac_int32;
-typedef uint32_t drflac_uint32;
-typedef int64_t drflac_int64;
-typedef uint64_t drflac_uint64;
-#endif
-typedef drflac_uint8 drflac_bool8;
-typedef drflac_uint32 drflac_bool32;
-#define DRFLAC_TRUE 1
-#define DRFLAC_FALSE 0
-
-#if defined(_MSC_VER) && _MSC_VER >= 1700 /* Visual Studio 2012 */
- #define DRFLAC_DEPRECATED __declspec(deprecated)
-#elif (defined(__GNUC__) && __GNUC__ >= 4) /* GCC 4 */
- #define DRFLAC_DEPRECATED __attribute__((deprecated))
-#elif defined(__has_feature) /* Clang */
- #if __has_feature(attribute_deprecated)
- #define DRFLAC_DEPRECATED __attribute__((deprecated))
- #else
- #define DRFLAC_DEPRECATED
- #endif
-#else
- #define DRFLAC_DEPRECATED
-#endif
-
-/*
-As data is read from the client it is placed into an internal buffer for fast access. This controls the
-size of that buffer. Larger values means more speed, but also more memory. In my testing there is diminishing
-returns after about 4KB, but you can fiddle with this to suit your own needs. Must be a multiple of 8.
-*/
-#ifndef DR_FLAC_BUFFER_SIZE
-#define DR_FLAC_BUFFER_SIZE 4096
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* Check if we can enable 64-bit optimizations. */
-#if defined(_WIN64) || defined(_LP64) || defined(__LP64__)
-#define DRFLAC_64BIT
-#endif
-
-#ifdef DRFLAC_64BIT
-typedef drflac_uint64 drflac_cache_t;
-#else
-typedef drflac_uint32 drflac_cache_t;
-#endif
-
-/* The various metadata block types. */
-#define DRFLAC_METADATA_BLOCK_TYPE_STREAMINFO 0
-#define DRFLAC_METADATA_BLOCK_TYPE_PADDING 1
-#define DRFLAC_METADATA_BLOCK_TYPE_APPLICATION 2
-#define DRFLAC_METADATA_BLOCK_TYPE_SEEKTABLE 3
-#define DRFLAC_METADATA_BLOCK_TYPE_VORBIS_COMMENT 4
-#define DRFLAC_METADATA_BLOCK_TYPE_CUESHEET 5
-#define DRFLAC_METADATA_BLOCK_TYPE_PICTURE 6
-#define DRFLAC_METADATA_BLOCK_TYPE_INVALID 127
-
-/* The various picture types specified in the PICTURE block. */
-#define DRFLAC_PICTURE_TYPE_OTHER 0
-#define DRFLAC_PICTURE_TYPE_FILE_ICON 1
-#define DRFLAC_PICTURE_TYPE_OTHER_FILE_ICON 2
-#define DRFLAC_PICTURE_TYPE_COVER_FRONT 3
-#define DRFLAC_PICTURE_TYPE_COVER_BACK 4
-#define DRFLAC_PICTURE_TYPE_LEAFLET_PAGE 5
-#define DRFLAC_PICTURE_TYPE_MEDIA 6
-#define DRFLAC_PICTURE_TYPE_LEAD_ARTIST 7
-#define DRFLAC_PICTURE_TYPE_ARTIST 8
-#define DRFLAC_PICTURE_TYPE_CONDUCTOR 9
-#define DRFLAC_PICTURE_TYPE_BAND 10
-#define DRFLAC_PICTURE_TYPE_COMPOSER 11
-#define DRFLAC_PICTURE_TYPE_LYRICIST 12
-#define DRFLAC_PICTURE_TYPE_RECORDING_LOCATION 13
-#define DRFLAC_PICTURE_TYPE_DURING_RECORDING 14
-#define DRFLAC_PICTURE_TYPE_DURING_PERFORMANCE 15
-#define DRFLAC_PICTURE_TYPE_SCREEN_CAPTURE 16
-#define DRFLAC_PICTURE_TYPE_BRIGHT_COLORED_FISH 17
-#define DRFLAC_PICTURE_TYPE_ILLUSTRATION 18
-#define DRFLAC_PICTURE_TYPE_BAND_LOGOTYPE 19
-#define DRFLAC_PICTURE_TYPE_PUBLISHER_LOGOTYPE 20
-
-typedef enum
-{
- drflac_container_native,
- drflac_container_ogg,
- drflac_container_unknown
-} drflac_container;
-
-typedef enum
-{
- drflac_seek_origin_start,
- drflac_seek_origin_current
-} drflac_seek_origin;
-
-/* Packing is important on this structure because we map this directly to the raw data within the SEEKTABLE metadata block. */
-#pragma pack(2)
-typedef struct
-{
- drflac_uint64 firstSample;
- drflac_uint64 frameOffset; /* The offset from the first byte of the header of the first frame. */
- drflac_uint16 sampleCount;
-} drflac_seekpoint;
-#pragma pack()
-
-typedef struct
-{
- drflac_uint16 minBlockSize;
- drflac_uint16 maxBlockSize;
- drflac_uint32 minFrameSize;
- drflac_uint32 maxFrameSize;
- drflac_uint32 sampleRate;
- drflac_uint8 channels;
- drflac_uint8 bitsPerSample;
- drflac_uint64 totalSampleCount;
- drflac_uint8 md5[16];
-} drflac_streaminfo;
-
-typedef struct
-{
- /* The metadata type. Use this to know how to interpret the data below. */
- drflac_uint32 type;
-
- /*
- A pointer to the raw data. This points to a temporary buffer so don't hold on to it. It's best to
- not modify the contents of this buffer. Use the structures below for more meaningful and structured
- information about the metadata. It's possible for this to be null.
- */
- const void* pRawData;
-
- /* The size in bytes of the block and the buffer pointed to by pRawData if it's non-NULL. */
- drflac_uint32 rawDataSize;
-
- union
- {
- drflac_streaminfo streaminfo;
-
- struct
- {
- int unused;
- } padding;
-
- struct
- {
- drflac_uint32 id;
- const void* pData;
- drflac_uint32 dataSize;
- } application;
-
- struct
- {
- drflac_uint32 seekpointCount;
- const drflac_seekpoint* pSeekpoints;
- } seektable;
-
- struct
- {
- drflac_uint32 vendorLength;
- const char* vendor;
- drflac_uint32 commentCount;
- const void* pComments;
- } vorbis_comment;
-
- struct
- {
- char catalog[128];
- drflac_uint64 leadInSampleCount;
- drflac_bool32 isCD;
- drflac_uint8 trackCount;
- const void* pTrackData;
- } cuesheet;
-
- struct
- {
- drflac_uint32 type;
- drflac_uint32 mimeLength;
- const char* mime;
- drflac_uint32 descriptionLength;
- const char* description;
- drflac_uint32 width;
- drflac_uint32 height;
- drflac_uint32 colorDepth;
- drflac_uint32 indexColorCount;
- drflac_uint32 pictureDataSize;
- const drflac_uint8* pPictureData;
- } picture;
- } data;
-} drflac_metadata;
-
-
-/*
-Callback for when data needs to be read from the client.
-
-pUserData [in] The user data that was passed to drflac_open() and family.
-pBufferOut [out] The output buffer.
-bytesToRead [in] The number of bytes to read.
-
-Returns the number of bytes actually read.
-
-A return value of less than bytesToRead indicates the end of the stream. Do _not_ return from this callback until
-either the entire bytesToRead is filled or you have reached the end of the stream.
-*/
-typedef size_t (* drflac_read_proc)(void* pUserData, void* pBufferOut, size_t bytesToRead);
-
-/*
-Callback for when data needs to be seeked.
-
-pUserData [in] The user data that was passed to drflac_open() and family.
-offset [in] The number of bytes to move, relative to the origin. Will never be negative.
-origin [in] The origin of the seek - the current position or the start of the stream.
-
-Returns whether or not the seek was successful.
-
-The offset will never be negative. Whether or not it is relative to the beginning or current position is determined
-by the "origin" parameter which will be either drflac_seek_origin_start or drflac_seek_origin_current.
-*/
-typedef drflac_bool32 (* drflac_seek_proc)(void* pUserData, int offset, drflac_seek_origin origin);
-
-/*
-Callback for when a metadata block is read.
-
-pUserData [in] The user data that was passed to drflac_open() and family.
-pMetadata [in] A pointer to a structure containing the data of the metadata block.
-
-Use pMetadata->type to determine which metadata block is being handled and how to read the data.
-*/
-typedef void (* drflac_meta_proc)(void* pUserData, drflac_metadata* pMetadata);
-
-
-/* Structure for internal use. Only used for decoders opened with drflac_open_memory. */
-typedef struct
-{
- const drflac_uint8* data;
- size_t dataSize;
- size_t currentReadPos;
-} drflac__memory_stream;
-
-/* Structure for internal use. Used for bit streaming. */
-typedef struct
-{
- /* The function to call when more data needs to be read. */
- drflac_read_proc onRead;
-
- /* The function to call when the current read position needs to be moved. */
- drflac_seek_proc onSeek;
-
- /* The user data to pass around to onRead and onSeek. */
- void* pUserData;
-
-
- /*
- The number of unaligned bytes in the L2 cache. This will always be 0 until the end of the stream is hit. At the end of the
- stream there will be a number of bytes that don't cleanly fit in an L1 cache line, so we use this variable to know whether
- or not the bistreamer needs to run on a slower path to read those last bytes. This will never be more than sizeof(drflac_cache_t).
- */
- size_t unalignedByteCount;
-
- /* The content of the unaligned bytes. */
- drflac_cache_t unalignedCache;
-
- /* The index of the next valid cache line in the "L2" cache. */
- drflac_uint32 nextL2Line;
-
- /* The number of bits that have been consumed by the cache. This is used to determine how many valid bits are remaining. */
- drflac_uint32 consumedBits;
-
- /*
- The cached data which was most recently read from the client. There are two levels of cache. Data flows as such:
- Client -> L2 -> L1. The L2 -> L1 movement is aligned and runs on a fast path in just a few instructions.
- */
- drflac_cache_t cacheL2[DR_FLAC_BUFFER_SIZE/sizeof(drflac_cache_t)];
- drflac_cache_t cache;
-
- /*
- CRC-16. This is updated whenever bits are read from the bit stream. Manually set this to 0 to reset the CRC. For FLAC, this
- is reset to 0 at the beginning of each frame.
- */
- drflac_uint16 crc16;
- drflac_cache_t crc16Cache; /* A cache for optimizing CRC calculations. This is filled when when the L1 cache is reloaded. */
- drflac_uint32 crc16CacheIgnoredBytes; /* The number of bytes to ignore when updating the CRC-16 from the CRC-16 cache. */
-} drflac_bs;
-
-typedef struct
-{
- /* The type of the subframe: SUBFRAME_CONSTANT, SUBFRAME_VERBATIM, SUBFRAME_FIXED or SUBFRAME_LPC. */
- drflac_uint8 subframeType;
-
- /* The number of wasted bits per sample as specified by the sub-frame header. */
- drflac_uint8 wastedBitsPerSample;
-
- /* The order to use for the prediction stage for SUBFRAME_FIXED and SUBFRAME_LPC. */
- drflac_uint8 lpcOrder;
-
- /*
- The number of bits per sample for this subframe. This is not always equal to the current frame's bit per sample because
- an extra bit is required for side channels when interchannel decorrelation is being used.
- */
- drflac_uint32 bitsPerSample;
-
- /*
- A pointer to the buffer containing the decoded samples in the subframe. This pointer is an offset from drflac::pExtraData. Note that
- it's a signed 32-bit integer for each value.
- */
- drflac_int32* pDecodedSamples;
-} drflac_subframe;
-
-typedef struct
-{
- /*
- If the stream uses variable block sizes, this will be set to the index of the first sample. If fixed block sizes are used, this will
- always be set to 0.
- */
- drflac_uint64 sampleNumber;
-
- /* If the stream uses fixed block sizes, this will be set to the frame number. If variable block sizes are used, this will always be 0. */
- drflac_uint32 frameNumber;
-
- /* The sample rate of this frame. */
- drflac_uint32 sampleRate;
-
- /* The number of samples in each sub-frame within this frame. */
- drflac_uint16 blockSize;
-
- /*
- The channel assignment of this frame. This is not always set to the channel count. If interchannel decorrelation is being used this
- will be set to DRFLAC_CHANNEL_ASSIGNMENT_LEFT_SIDE, DRFLAC_CHANNEL_ASSIGNMENT_RIGHT_SIDE or DRFLAC_CHANNEL_ASSIGNMENT_MID_SIDE.
- */
- drflac_uint8 channelAssignment;
-
- /* The number of bits per sample within this frame. */
- drflac_uint8 bitsPerSample;
-
- /* The frame's CRC. */
- drflac_uint8 crc8;
-} drflac_frame_header;
-
-typedef struct
-{
- /* The header. */
- drflac_frame_header header;
-
- /*
- The number of samples left to be read in this frame. This is initially set to the block size multiplied by the channel count. As samples
- are read, this will be decremented. When it reaches 0, the decoder will see this frame as fully consumed and load the next frame.
- */
- drflac_uint32 samplesRemaining;
-
- /* The list of sub-frames within the frame. There is one sub-frame for each channel, and there's a maximum of 8 channels. */
- drflac_subframe subframes[8];
-} drflac_frame;
-
-typedef struct
-{
- /* The function to call when a metadata block is read. */
- drflac_meta_proc onMeta;
-
- /* The user data posted to the metadata callback function. */
- void* pUserDataMD;
-
-
- /* The sample rate. Will be set to something like 44100. */
- drflac_uint32 sampleRate;
-
- /*
- The number of channels. This will be set to 1 for monaural streams, 2 for stereo, etc. Maximum 8. This is set based on the
- value specified in the STREAMINFO block.
- */
- drflac_uint8 channels;
-
- /* The bits per sample. Will be set to something like 16, 24, etc. */
- drflac_uint8 bitsPerSample;
-
- /* The maximum block size, in samples. This number represents the number of samples in each channel (not combined). */
- drflac_uint16 maxBlockSize;
-
- /*
- The total number of samples making up the stream. This includes every channel. For example, if the stream has 2 channels,
- with each channel having a total of 4096, this value will be set to 2*4096 = 8192. Can be 0 in which case it's still a
- valid stream, but just means the total sample count is unknown. Likely the case with streams like internet radio.
- */
- drflac_uint64 totalSampleCount;
- drflac_uint64 totalPCMFrameCount; /* <-- Equal to totalSampleCount / channels. */
-
-
- /* The container type. This is set based on whether or not the decoder was opened from a native or Ogg stream. */
- drflac_container container;
-
- /* The number of seekpoints in the seektable. */
- drflac_uint32 seekpointCount;
-
-
- /* Information about the frame the decoder is currently sitting on. */
- drflac_frame currentFrame;
-
- /* The index of the sample the decoder is currently sitting on. This is only used for seeking. */
- drflac_uint64 currentSample;
-
- /* The position of the first frame in the stream. This is only ever used for seeking. */
- drflac_uint64 firstFramePos;
-
-
- /* A hack to avoid a malloc() when opening a decoder with drflac_open_memory(). */
- drflac__memory_stream memoryStream;
-
-
- /* A pointer to the decoded sample data. This is an offset of pExtraData. */
- drflac_int32* pDecodedSamples;
-
- /* A pointer to the seek table. This is an offset of pExtraData, or NULL if there is no seek table. */
- drflac_seekpoint* pSeekpoints;
-
- /* Internal use only. Only used with Ogg containers. Points to a drflac_oggbs object. This is an offset of pExtraData. */
- void* _oggbs;
-
- /* The bit streamer. The raw FLAC data is fed through this object. */
- drflac_bs bs;
-
- /* Variable length extra data. We attach this to the end of the object so we can avoid unnecessary mallocs. */
- drflac_uint8 pExtraData[1];
-} drflac;
-
-
-/*
-Opens a FLAC decoder.
-
-onRead [in] The function to call when data needs to be read from the client.
-onSeek [in] The function to call when the read position of the client data needs to move.
-pUserData [in, optional] A pointer to application defined data that will be passed to onRead and onSeek.
-
-Returns a pointer to an object representing the decoder.
-
-Close the decoder with drflac_close().
-
-This function will automatically detect whether or not you are attempting to open a native or Ogg encapsulated
-FLAC, both of which should work seamlessly without any manual intervention. Ogg encapsulation also works with
-multiplexed streams which basically means it can play FLAC encoded audio tracks in videos.
-
-This is the lowest level function for opening a FLAC stream. You can also use drflac_open_file() and drflac_open_memory()
-to open the stream from a file or from a block of memory respectively.
-
-The STREAMINFO block must be present for this to succeed. Use drflac_open_relaxed() to open a FLAC stream where
-the header may not be present.
-
-See also: drflac_open_file(), drflac_open_memory(), drflac_open_with_metadata(), drflac_close()
-*/
-drflac* drflac_open(drflac_read_proc onRead, drflac_seek_proc onSeek, void* pUserData);
-
-/*
-The same as drflac_open(), except attempts to open the stream even when a header block is not present.
-
-Because the header is not necessarily available, the caller must explicitly define the container (Native or Ogg). Do
-not set this to drflac_container_unknown - that is for internal use only.
-
-Opening in relaxed mode will continue reading data from onRead until it finds a valid frame. If a frame is never
-found it will continue forever. To abort, force your onRead callback to return 0, which dr_flac will use as an
-indicator that the end of the stream was found.
-*/
-drflac* drflac_open_relaxed(drflac_read_proc onRead, drflac_seek_proc onSeek, drflac_container container, void* pUserData);
-
-/*
-Opens a FLAC decoder and notifies the caller of the metadata chunks (album art, etc.).
-
-onRead [in] The function to call when data needs to be read from the client.
-onSeek [in] The function to call when the read position of the client data needs to move.
-onMeta [in] The function to call for every metadata block.
-pUserData [in, optional] A pointer to application defined data that will be passed to onRead, onSeek and onMeta.
-
-Returns a pointer to an object representing the decoder.
-
-Close the decoder with drflac_close().
-
-This is slower than drflac_open(), so avoid this one if you don't need metadata. Internally, this will do a DRFLAC_MALLOC()
-and DRFLAC_FREE() for every metadata block except for STREAMINFO and PADDING blocks.
-
-The caller is notified of the metadata via the onMeta callback. All metadata blocks will be handled before the function
-returns.
-
-The STREAMINFO block must be present for this to succeed. Use drflac_open_with_metadata_relaxed() to open a FLAC
-stream where the header may not be present.
-
-Note that this will behave inconsistently with drflac_open() if the stream is an Ogg encapsulated stream and a metadata
-block is corrupted. This is due to the way the Ogg stream recovers from corrupted pages. When drflac_open_with_metadata()
-is being used, the open routine will try to read the contents of the metadata block, whereas drflac_open() will simply
-seek past it (for the sake of efficiency). This inconsistency can result in different samples being returned depending on
-whether or not the stream is being opened with metadata.
-
-See also: drflac_open_file_with_metadata(), drflac_open_memory_with_metadata(), drflac_open(), drflac_close()
-*/
-drflac* drflac_open_with_metadata(drflac_read_proc onRead, drflac_seek_proc onSeek, drflac_meta_proc onMeta, void* pUserData);
-
-/*
-The same as drflac_open_with_metadata(), except attempts to open the stream even when a header block is not present.
-
-See also: drflac_open_with_metadata(), drflac_open_relaxed()
-*/
-drflac* drflac_open_with_metadata_relaxed(drflac_read_proc onRead, drflac_seek_proc onSeek, drflac_meta_proc onMeta, drflac_container container, void* pUserData);
-
-/*
-Closes the given FLAC decoder.
-
-pFlac [in] The decoder to close.
-
-This will destroy the decoder object.
-*/
-void drflac_close(drflac* pFlac);
-
-
-/*
-Reads sample data from the given FLAC decoder, output as interleaved signed 32-bit PCM.
-
-pFlac [in] The decoder.
-framesToRead [in] The number of PCM frames to read.
-pBufferOut [out, optional] A pointer to the buffer that will receive the decoded samples.
-
-Returns the number of PCM frames actually read.
-
-pBufferOut can be null, in which case the call will act as a seek, and the return value will be the number of frames
-seeked.
-*/
-drflac_uint64 drflac_read_pcm_frames_s32(drflac* pFlac, drflac_uint64 framesToRead, drflac_int32* pBufferOut);
-
-/*
-Same as drflac_read_pcm_frames_s32(), except outputs samples as 16-bit integer PCM rather than 32-bit.
-
-Note that this is lossy for streams where the bits per sample is larger than 16.
-*/
-drflac_uint64 drflac_read_pcm_frames_s16(drflac* pFlac, drflac_uint64 framesToRead, drflac_int16* pBufferOut);
-
-/*
-Same as drflac_read_pcm_frames_s32(), except outputs samples as 32-bit floating-point PCM.
-
-Note that this should be considered lossy due to the nature of floating point numbers not being able to exactly
-represent every possible number.
-*/
-drflac_uint64 drflac_read_pcm_frames_f32(drflac* pFlac, drflac_uint64 framesToRead, float* pBufferOut);
-
-/*
-Seeks to the PCM frame at the given index.
-
-pFlac [in] The decoder.
-pcmFrameIndex [in] The index of the PCM frame to seek to. See notes below.
-
-Returns DRFLAC_TRUE if successful; DRFLAC_FALSE otherwise.
-*/
-drflac_bool32 drflac_seek_to_pcm_frame(drflac* pFlac, drflac_uint64 pcmFrameIndex);
-
-
-
-#ifndef DR_FLAC_NO_STDIO
-/*
-Opens a FLAC decoder from the file at the given path.
-
-filename [in] The path of the file to open, either absolute or relative to the current directory.
-
-Returns a pointer to an object representing the decoder.
-
-Close the decoder with drflac_close().
-
-This will hold a handle to the file until the decoder is closed with drflac_close(). Some platforms will restrict the
-number of files a process can have open at any given time, so keep this mind if you have many decoders open at the
-same time.
-
-See also: drflac_open(), drflac_open_file_with_metadata(), drflac_close()
-*/
-drflac* drflac_open_file(const char* filename);
-
-/*
-Opens a FLAC decoder from the file at the given path and notifies the caller of the metadata chunks (album art, etc.)
-
-Look at the documentation for drflac_open_with_metadata() for more information on how metadata is handled.
-*/
-drflac* drflac_open_file_with_metadata(const char* filename, drflac_meta_proc onMeta, void* pUserData);
-#endif
-
-/*
-Opens a FLAC decoder from a pre-allocated block of memory
-
-This does not create a copy of the data. It is up to the application to ensure the buffer remains valid for
-the lifetime of the decoder.
-*/
-drflac* drflac_open_memory(const void* data, size_t dataSize);
-
-/*
-Opens a FLAC decoder from a pre-allocated block of memory and notifies the caller of the metadata chunks (album art, etc.)
-
-Look at the documentation for drflac_open_with_metadata() for more information on how metadata is handled.
-*/
-drflac* drflac_open_memory_with_metadata(const void* data, size_t dataSize, drflac_meta_proc onMeta, void* pUserData);
-
-
-
-/* High Level APIs */
-
-/*
-Opens a FLAC stream from the given callbacks and fully decodes it in a single operation. The return value is a
-pointer to the sample data as interleaved signed 32-bit PCM. The returned data must be freed with DRFLAC_FREE().
-
-Sometimes a FLAC file won't keep track of the total sample count. In this situation the function will continuously
-read samples into a dynamically sized buffer on the heap until no samples are left.
-
-Do not call this function on a broadcast type of stream (like internet radio streams and whatnot).
-*/
-drflac_int32* drflac_open_and_read_pcm_frames_s32(drflac_read_proc onRead, drflac_seek_proc onSeek, void* pUserData, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalPCMFrameCount);
-
-/* Same as drflac_open_and_read_pcm_frames_s32(), except returns signed 16-bit integer samples. */
-drflac_int16* drflac_open_and_read_pcm_frames_s16(drflac_read_proc onRead, drflac_seek_proc onSeek, void* pUserData, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalPCMFrameCount);
-
-/* Same as drflac_open_and_read_pcm_frames_s32(), except returns 32-bit floating-point samples. */
-float* drflac_open_and_read_pcm_frames_f32(drflac_read_proc onRead, drflac_seek_proc onSeek, void* pUserData, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalPCMFrameCount);
-
-#ifndef DR_FLAC_NO_STDIO
-/* Same as drflac_open_and_read_pcm_frames_s32() except opens the decoder from a file. */
-drflac_int32* drflac_open_file_and_read_pcm_frames_s32(const char* filename, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalPCMFrameCount);
-
-/* Same as drflac_open_file_and_read_pcm_frames_s32(), except returns signed 16-bit integer samples. */
-drflac_int16* drflac_open_file_and_read_pcm_frames_s16(const char* filename, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalPCMFrameCount);
-
-/* Same as drflac_open_file_and_read_pcm_frames_s32(), except returns 32-bit floating-point samples. */
-float* drflac_open_file_and_read_pcm_frames_f32(const char* filename, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalPCMFrameCount);
-#endif
-
-/* Same as drflac_open_and_read_pcm_frames_s32() except opens the decoder from a block of memory. */
-drflac_int32* drflac_open_memory_and_read_pcm_frames_s32(const void* data, size_t dataSize, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalPCMFrameCount);
-
-/* Same as drflac_open_memory_and_read_pcm_frames_s32(), except returns signed 16-bit integer samples. */
-drflac_int16* drflac_open_memory_and_read_pcm_frames_s16(const void* data, size_t dataSize, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalPCMFrameCount);
-
-/* Same as drflac_open_memory_and_read_pcm_frames_s32(), except returns 32-bit floating-point samples. */
-float* drflac_open_memory_and_read_pcm_frames_f32(const void* data, size_t dataSize, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalPCMFrameCount);
-
-/* Frees memory that was allocated internally by dr_flac. */
-void drflac_free(void* p);
-
-
-/* Structure representing an iterator for vorbis comments in a VORBIS_COMMENT metadata block. */
-typedef struct
-{
- drflac_uint32 countRemaining;
- const char* pRunningData;
-} drflac_vorbis_comment_iterator;
-
-/*
-Initializes a vorbis comment iterator. This can be used for iterating over the vorbis comments in a VORBIS_COMMENT
-metadata block.
-*/
-void drflac_init_vorbis_comment_iterator(drflac_vorbis_comment_iterator* pIter, drflac_uint32 commentCount, const void* pComments);
-
-/*
-Goes to the next vorbis comment in the given iterator. If null is returned it means there are no more comments. The
-returned string is NOT null terminated.
-*/
-const char* drflac_next_vorbis_comment(drflac_vorbis_comment_iterator* pIter, drflac_uint32* pCommentLengthOut);
-
-
-/* Structure representing an iterator for cuesheet tracks in a CUESHEET metadata block. */
-typedef struct
-{
- drflac_uint32 countRemaining;
- const char* pRunningData;
-} drflac_cuesheet_track_iterator;
-
-/* Packing is important on this structure because we map this directly to the raw data within the CUESHEET metadata block. */
-#pragma pack(4)
-typedef struct
-{
- drflac_uint64 offset;
- drflac_uint8 index;
- drflac_uint8 reserved[3];
-} drflac_cuesheet_track_index;
-#pragma pack()
-
-typedef struct
-{
- drflac_uint64 offset;
- drflac_uint8 trackNumber;
- char ISRC[12];
- drflac_bool8 isAudio;
- drflac_bool8 preEmphasis;
- drflac_uint8 indexCount;
- const drflac_cuesheet_track_index* pIndexPoints;
-} drflac_cuesheet_track;
-
-/*
-Initializes a cuesheet track iterator. This can be used for iterating over the cuesheet tracks in a CUESHEET metadata
-block.
-*/
-void drflac_init_cuesheet_track_iterator(drflac_cuesheet_track_iterator* pIter, drflac_uint32 trackCount, const void* pTrackData);
-
-/* Goes to the next cuesheet track in the given iterator. If DRFLAC_FALSE is returned it means there are no more comments. */
-drflac_bool32 drflac_next_cuesheet_track(drflac_cuesheet_track_iterator* pIter, drflac_cuesheet_track* pCuesheetTrack);
-
-
-/* Deprecated APIs */
-DRFLAC_DEPRECATED drflac_uint64 drflac_read_s32(drflac* pFlac, drflac_uint64 samplesToRead, drflac_int32* pBufferOut); /* Use drflac_read_pcm_frames_s32() instead. */
-DRFLAC_DEPRECATED drflac_uint64 drflac_read_s16(drflac* pFlac, drflac_uint64 samplesToRead, drflac_int16* pBufferOut); /* Use drflac_read_pcm_frames_s16() instead. */
-DRFLAC_DEPRECATED drflac_uint64 drflac_read_f32(drflac* pFlac, drflac_uint64 samplesToRead, float* pBufferOut); /* Use drflac_read_pcm_frames_f32() instead. */
-DRFLAC_DEPRECATED drflac_bool32 drflac_seek_to_sample(drflac* pFlac, drflac_uint64 sampleIndex); /* Use drflac_seek_to_pcm_frame() instead. */
-DRFLAC_DEPRECATED drflac_int32* drflac_open_and_decode_s32(drflac_read_proc onRead, drflac_seek_proc onSeek, void* pUserData, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalSampleCount); /* Use drflac_open_and_read_pcm_frames_s32(). */
-DRFLAC_DEPRECATED drflac_int16* drflac_open_and_decode_s16(drflac_read_proc onRead, drflac_seek_proc onSeek, void* pUserData, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalSampleCount); /* Use drflac_open_and_read_pcm_frames_s16(). */
-DRFLAC_DEPRECATED float* drflac_open_and_decode_f32(drflac_read_proc onRead, drflac_seek_proc onSeek, void* pUserData, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalSampleCount); /* Use drflac_open_and_read_pcm_frames_f32(). */
-DRFLAC_DEPRECATED drflac_int32* drflac_open_and_decode_file_s32(const char* filename, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalSampleCount); /* Use drflac_open_file_and_read_pcm_frames_s32(). */
-DRFLAC_DEPRECATED drflac_int16* drflac_open_and_decode_file_s16(const char* filename, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalSampleCount); /* Use drflac_open_file_and_read_pcm_frames_s16(). */
-DRFLAC_DEPRECATED float* drflac_open_and_decode_file_f32(const char* filename, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalSampleCount); /* Use drflac_open_file_and_read_pcm_frames_f32(). */
-DRFLAC_DEPRECATED drflac_int32* drflac_open_and_decode_memory_s32(const void* data, size_t dataSize, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalSampleCount); /* Use drflac_open_memory_and_read_pcm_frames_s32(). */
-DRFLAC_DEPRECATED drflac_int16* drflac_open_and_decode_memory_s16(const void* data, size_t dataSize, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalSampleCount); /* Use drflac_open_memory_and_read_pcm_frames_s16(). */
-DRFLAC_DEPRECATED float* drflac_open_and_decode_memory_f32(const void* data, size_t dataSize, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalSampleCount); /* Use drflac_open_memory_and_read_pcm_frames_f32(). */
-
-#ifdef __cplusplus
-}
-#endif
-#endif /* dr_flac_h */
-
-
-/************************************************************************************************************************************************************
- ************************************************************************************************************************************************************
-
- IMPLEMENTATION
-
- ************************************************************************************************************************************************************
- ************************************************************************************************************************************************************/
-#ifdef DR_FLAC_IMPLEMENTATION
-
-/* Disable some annoying warnings. */
-#if defined(__GNUC__)
- #pragma GCC diagnostic push
- #if __GNUC__ >= 7
- #pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
- #endif
-#endif
-
-#ifdef __linux__
- #ifndef _BSD_SOURCE
- #define _BSD_SOURCE
- #endif
- #ifndef __USE_BSD
- #define __USE_BSD
- #endif
- #include <endian.h>
-#endif
-
-#include <stdlib.h>
-#include <string.h>
-
-#ifdef _MSC_VER
-#define DRFLAC_INLINE __forceinline
-#else
-#ifdef __GNUC__
-#define DRFLAC_INLINE __inline__ __attribute__((always_inline))
-#else
-#define DRFLAC_INLINE
-#endif
-#endif
-
-/* CPU architecture. */
-#if defined(__x86_64__) || defined(_M_X64)
- #define DRFLAC_X64
-#elif defined(__i386) || defined(_M_IX86)
- #define DRFLAC_X86
-#elif defined(__arm__) || defined(_M_ARM)
- #define DRFLAC_ARM
-#endif
-
-/* Intrinsics Support */
-#if !defined(DR_FLAC_NO_SIMD)
- #if defined(DRFLAC_X64) || defined(DRFLAC_X86)
- #if defined(_MSC_VER) && !defined(__clang__)
- /* MSVC. */
- #if _MSC_VER >= 1400 && !defined(DRFLAC_NO_SSE2) /* 2005 */
- #define DRFLAC_SUPPORT_SSE2
- #endif
- #if _MSC_VER >= 1600 && !defined(DRFLAC_NO_SSE41) /* 2010 */
- #define DRFLAC_SUPPORT_SSE41
- #endif
- #else
- /* Assume GNUC-style. */
- #if defined(__SSE2__) && !defined(DRFLAC_NO_SSE2)
- #define DRFLAC_SUPPORT_SSE2
- #endif
- #if defined(__SSE4_1__) && !defined(DRFLAC_NO_SSE41)
- #define DRFLAC_SUPPORT_SSE41
- #endif
- #endif
-
- /* If at this point we still haven't determined compiler support for the intrinsics just fall back to __has_include. */
- #if !defined(__GNUC__) && !defined(__clang__) && defined(__has_include)
- #if !defined(DRFLAC_SUPPORT_SSE2) && !defined(DRFLAC_NO_SSE2) && __has_include(<emmintrin.h>)
- #define DRFLAC_SUPPORT_SSE2
- #endif
- #if !defined(DRFLAC_SUPPORT_SSE41) && !defined(DRFLAC_NO_SSE41) && __has_include(<smmintrin.h>)
- #define DRFLAC_SUPPORT_SSE41
- #endif
- #endif
-
- #if defined(DRFLAC_SUPPORT_SSE41)
- #include <smmintrin.h>
- #elif defined(DRFLAC_SUPPORT_SSE2)
- #include <emmintrin.h>
- #endif
- #endif
-
- #if defined(DRFLAC_ARM)
- #if !defined(DRFLAC_NO_NEON) && (defined(__ARM_NEON) || defined(__aarch64__) || defined(_M_ARM64))
- #define DRFLAC_SUPPORT_NEON
- #endif
-
- /* Fall back to looking for the #include file. */
- #if !defined(__GNUC__) && !defined(__clang__) && defined(__has_include)
- #if !defined(DRFLAC_SUPPORT_NEON) && !defined(DRFLAC_NO_NEON) && __has_include(<arm_neon.h>)
- #define DRFLAC_SUPPORT_NEON
- #endif
- #endif
-
- #if defined(DRFLAC_SUPPORT_NEON)
- #include <arm_neon.h>
- #endif
- #endif
-#endif
-
-/* Compile-time CPU feature support. */
-#if !defined(DR_FLAC_NO_SIMD) && (defined(DRFLAC_X86) || defined(DRFLAC_X64))
- #if defined(_MSC_VER) && !defined(__clang__)
- #if _MSC_VER >= 1400
- #include <intrin.h>
- static void drflac__cpuid(int info[4], int fid)
- {
- __cpuid(info, fid);
- }
- #else
- #define DRFLAC_NO_CPUID
- #endif
- #else
- #if defined(__GNUC__) || defined(__clang__)
- static void drflac__cpuid(int info[4], int fid)
- {
- /*
- It looks like the -fPIC option uses the ebx register which GCC complains about. We can work around this by just using a different register, the
- specific register of which I'm letting the compiler decide on. The "k" prefix is used to specify a 32-bit register. The {...} syntax is for
- supporting different assembly dialects.
-
- What's basically happening is that we're saving and restoring the ebx register manually.
- */
- #if defined(DRFLAC_X86) && defined(__PIC__)
- __asm__ __volatile__ (
- "xchg{l} {%%}ebx, %k1;"
- "cpuid;"
- "xchg{l} {%%}ebx, %k1;"
- : "=a"(info[0]), "=&r"(info[1]), "=c"(info[2]), "=d"(info[3]) : "a"(fid), "c"(0)
- );
- #else
- __asm__ __volatile__ (
- "cpuid" : "=a"(info[0]), "=b"(info[1]), "=c"(info[2]), "=d"(info[3]) : "a"(fid), "c"(0)
- );
- #endif
- }
- #else
- #define DRFLAC_NO_CPUID
- #endif
- #endif
-#else
- #define DRFLAC_NO_CPUID
-#endif
-
-static DRFLAC_INLINE drflac_bool32 drflac_has_sse2()
-{
-#if defined(DRFLAC_SUPPORT_SSE2)
- #if (defined(DRFLAC_X64) || defined(DRFLAC_X86)) && !defined(DRFLAC_NO_SSE2)
- #if defined(DRFLAC_X64)
- return DRFLAC_TRUE; /* 64-bit targets always support SSE2. */
- #elif (defined(_M_IX86_FP) && _M_IX86_FP == 2) || defined(__SSE2__)
- return DRFLAC_TRUE; /* If the compiler is allowed to freely generate SSE2 code we can assume support. */
- #else
- #if defined(DRFLAC_NO_CPUID)
- return DRFLAC_FALSE;
- #else
- int info[4];
- drflac__cpuid(info, 1);
- return (info[3] & (1 << 26)) != 0;
- #endif
- #endif
- #else
- return DRFLAC_FALSE; /* SSE2 is only supported on x86 and x64 architectures. */
- #endif
-#else
- return DRFLAC_FALSE; /* No compiler support. */
-#endif
-}
-
-static DRFLAC_INLINE drflac_bool32 drflac_has_sse41()
-{
-#if defined(DRFLAC_SUPPORT_SSE41)
- #if (defined(DRFLAC_X64) || defined(DRFLAC_X86)) && !defined(DRFLAC_NO_SSE41)
- #if defined(DRFLAC_X64)
- return DRFLAC_TRUE; /* 64-bit targets always support SSE4.1. */
- #elif (defined(_M_IX86_FP) && _M_IX86_FP == 2) || defined(__SSE4_1__)
- return DRFLAC_TRUE; /* If the compiler is allowed to freely generate SSE41 code we can assume support. */
- #else
- #if defined(DRFLAC_NO_CPUID)
- return DRFLAC_FALSE;
- #else
- int info[4];
- drflac__cpuid(info, 1);
- return (info[2] & (1 << 19)) != 0;
- #endif
- #endif
- #else
- return DRFLAC_FALSE; /* SSE41 is only supported on x86 and x64 architectures. */
- #endif
-#else
- return DRFLAC_FALSE; /* No compiler support. */
-#endif
-}
-
-
-#if defined(_MSC_VER) && _MSC_VER >= 1500 && (defined(DRFLAC_X86) || defined(DRFLAC_X64))
- #define DRFLAC_HAS_LZCNT_INTRINSIC
-#elif (defined(__GNUC__) && ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7)))
- #define DRFLAC_HAS_LZCNT_INTRINSIC
-#elif defined(__clang__)
- #if __has_builtin(__builtin_clzll) || __has_builtin(__builtin_clzl)
- #define DRFLAC_HAS_LZCNT_INTRINSIC
- #endif
-#endif
-
-#if defined(_MSC_VER) && _MSC_VER >= 1300
- #define DRFLAC_HAS_BYTESWAP16_INTRINSIC
- #define DRFLAC_HAS_BYTESWAP32_INTRINSIC
- #define DRFLAC_HAS_BYTESWAP64_INTRINSIC
-#elif defined(__clang__)
- #if __has_builtin(__builtin_bswap16)
- #define DRFLAC_HAS_BYTESWAP16_INTRINSIC
- #endif
- #if __has_builtin(__builtin_bswap32)
- #define DRFLAC_HAS_BYTESWAP32_INTRINSIC
- #endif
- #if __has_builtin(__builtin_bswap64)
- #define DRFLAC_HAS_BYTESWAP64_INTRINSIC
- #endif
-#elif defined(__GNUC__)
- #if ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
- #define DRFLAC_HAS_BYTESWAP32_INTRINSIC
- #define DRFLAC_HAS_BYTESWAP64_INTRINSIC
- #endif
- #if ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))
- #define DRFLAC_HAS_BYTESWAP16_INTRINSIC
- #endif
-#endif
-
-
-/* Standard library stuff. */
-#ifndef DRFLAC_ASSERT
-#include <assert.h>
-#define DRFLAC_ASSERT(expression) assert(expression)
-#endif
-#ifndef DRFLAC_MALLOC
-#define DRFLAC_MALLOC(sz) malloc((sz))
-#endif
-#ifndef DRFLAC_REALLOC
-#define DRFLAC_REALLOC(p, sz) realloc((p), (sz))
-#endif
-#ifndef DRFLAC_FREE
-#define DRFLAC_FREE(p) free((p))
-#endif
-#ifndef DRFLAC_COPY_MEMORY
-#define DRFLAC_COPY_MEMORY(dst, src, sz) memcpy((dst), (src), (sz))
-#endif
-#ifndef DRFLAC_ZERO_MEMORY
-#define DRFLAC_ZERO_MEMORY(p, sz) memset((p), 0, (sz))
-#endif
-
-#define DRFLAC_MAX_SIMD_VECTOR_SIZE 64 /* 64 for AVX-512 in the future. */
-
-typedef drflac_int32 drflac_result;
-#define DRFLAC_SUCCESS 0
-#define DRFLAC_ERROR -1 /* A generic error. */
-#define DRFLAC_INVALID_ARGS -2
-#define DRFLAC_END_OF_STREAM -128
-#define DRFLAC_CRC_MISMATCH -129
-
-#define DRFLAC_SUBFRAME_CONSTANT 0
-#define DRFLAC_SUBFRAME_VERBATIM 1
-#define DRFLAC_SUBFRAME_FIXED 8
-#define DRFLAC_SUBFRAME_LPC 32
-#define DRFLAC_SUBFRAME_RESERVED 255
-
-#define DRFLAC_RESIDUAL_CODING_METHOD_PARTITIONED_RICE 0
-#define DRFLAC_RESIDUAL_CODING_METHOD_PARTITIONED_RICE2 1
-
-#define DRFLAC_CHANNEL_ASSIGNMENT_INDEPENDENT 0
-#define DRFLAC_CHANNEL_ASSIGNMENT_LEFT_SIDE 8
-#define DRFLAC_CHANNEL_ASSIGNMENT_RIGHT_SIDE 9
-#define DRFLAC_CHANNEL_ASSIGNMENT_MID_SIDE 10
-
-/*
-Keeps track of the number of leading samples for each sub-frame. This is required because the SSE pipeline will occasionally
-reference excess prior samples.
-*/
-#define DRFLAC_LEADING_SAMPLES 32
-
-
-#define drflac_align(x, a) ((((x) + (a) - 1) / (a)) * (a))
-#define drflac_assert DRFLAC_ASSERT
-#define drflac_copy_memory DRFLAC_COPY_MEMORY
-#define drflac_zero_memory DRFLAC_ZERO_MEMORY
-
-
-/* CPU caps. */
-static drflac_bool32 drflac__gIsLZCNTSupported = DRFLAC_FALSE;
-#ifndef DRFLAC_NO_CPUID
-/*
-I've had a bug report that Clang's ThreadSanitizer presents a warning in this function. Having reviewed this, this does
-actually make sense. However, since CPU caps should never differ for a running process, I don't think the trade off of
-complicating internal API's by passing around CPU caps versus just disabling the warnings is worthwhile. I'm therefore
-just going to disable these warnings.
-*/
-#if defined(__has_feature)
- #if __has_feature(thread_sanitizer)
- #define DRFLAC_NO_THREAD_SANITIZE __attribute__((no_sanitize("thread")))
- #else
- #define DRFLAC_NO_THREAD_SANITIZE
- #endif
-#else
- #define DRFLAC_NO_THREAD_SANITIZE
-#endif
-static drflac_bool32 drflac__gIsSSE2Supported = DRFLAC_FALSE;
-static drflac_bool32 drflac__gIsSSE41Supported = DRFLAC_FALSE;
-DRFLAC_NO_THREAD_SANITIZE static void drflac__init_cpu_caps()
-{
- static drflac_bool32 isCPUCapsInitialized = DRFLAC_FALSE;
-
- if (!isCPUCapsInitialized) {
- int info[4] = {0};
-
- /* LZCNT */
- drflac__cpuid(info, 0x80000001);
- drflac__gIsLZCNTSupported = (info[2] & (1 << 5)) != 0;
-
- /* SSE2 */
- drflac__gIsSSE2Supported = drflac_has_sse2();
-
- /* SSE4.1 */
- drflac__gIsSSE41Supported = drflac_has_sse41();
-
- /* Initialized. */
- isCPUCapsInitialized = DRFLAC_TRUE;
- }
-}
-#endif
-
-
-/* Endian Management */
-static DRFLAC_INLINE drflac_bool32 drflac__is_little_endian()
-{
-#if defined(DRFLAC_X86) || defined(DRFLAC_X64)
- return DRFLAC_TRUE;
-#elif defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && __BYTE_ORDER == __LITTLE_ENDIAN
- return DRFLAC_TRUE;
-#else
- int n = 1;
- return (*(char*)&n) == 1;
-#endif
-}
-
-static DRFLAC_INLINE drflac_uint16 drflac__swap_endian_uint16(drflac_uint16 n)
-{
-#ifdef DRFLAC_HAS_BYTESWAP16_INTRINSIC
- #if defined(_MSC_VER)
- return _byteswap_ushort(n);
- #elif defined(__GNUC__) || defined(__clang__)
- return __builtin_bswap16(n);
- #else
- #error "This compiler does not support the byte swap intrinsic."
- #endif
-#else
- return ((n & 0xFF00) >> 8) |
- ((n & 0x00FF) << 8);
-#endif
-}
-
-static DRFLAC_INLINE drflac_uint32 drflac__swap_endian_uint32(drflac_uint32 n)
-{
-#ifdef DRFLAC_HAS_BYTESWAP32_INTRINSIC
- #if defined(_MSC_VER)
- return _byteswap_ulong(n);
- #elif defined(__GNUC__) || defined(__clang__)
- return __builtin_bswap32(n);
- #else
- #error "This compiler does not support the byte swap intrinsic."
- #endif
-#else
- return ((n & 0xFF000000) >> 24) |
- ((n & 0x00FF0000) >> 8) |
- ((n & 0x0000FF00) << 8) |
- ((n & 0x000000FF) << 24);
-#endif
-}
-
-static DRFLAC_INLINE drflac_uint64 drflac__swap_endian_uint64(drflac_uint64 n)
-{
-#ifdef DRFLAC_HAS_BYTESWAP64_INTRINSIC
- #if defined(_MSC_VER)
- return _byteswap_uint64(n);
- #elif defined(__GNUC__) || defined(__clang__)
- return __builtin_bswap64(n);
- #else
- #error "This compiler does not support the byte swap intrinsic."
- #endif
-#else
- return ((n & (drflac_uint64)0xFF00000000000000) >> 56) |
- ((n & (drflac_uint64)0x00FF000000000000) >> 40) |
- ((n & (drflac_uint64)0x0000FF0000000000) >> 24) |
- ((n & (drflac_uint64)0x000000FF00000000) >> 8) |
- ((n & (drflac_uint64)0x00000000FF000000) << 8) |
- ((n & (drflac_uint64)0x0000000000FF0000) << 24) |
- ((n & (drflac_uint64)0x000000000000FF00) << 40) |
- ((n & (drflac_uint64)0x00000000000000FF) << 56);
-#endif
-}
-
-
-static DRFLAC_INLINE drflac_uint16 drflac__be2host_16(drflac_uint16 n)
-{
- if (drflac__is_little_endian()) {
- return drflac__swap_endian_uint16(n);
- }
-
- return n;
-}
-
-static DRFLAC_INLINE drflac_uint32 drflac__be2host_32(drflac_uint32 n)
-{
- if (drflac__is_little_endian()) {
- return drflac__swap_endian_uint32(n);
- }
-
- return n;
-}
-
-static DRFLAC_INLINE drflac_uint64 drflac__be2host_64(drflac_uint64 n)
-{
- if (drflac__is_little_endian()) {
- return drflac__swap_endian_uint64(n);
- }
-
- return n;
-}
-
-
-static DRFLAC_INLINE drflac_uint32 drflac__le2host_32(drflac_uint32 n)
-{
- if (!drflac__is_little_endian()) {
- return drflac__swap_endian_uint32(n);
- }
-
- return n;
-}
-
-
-static DRFLAC_INLINE drflac_uint32 drflac__unsynchsafe_32(drflac_uint32 n)
-{
- drflac_uint32 result = 0;
- result |= (n & 0x7F000000) >> 3;
- result |= (n & 0x007F0000) >> 2;
- result |= (n & 0x00007F00) >> 1;
- result |= (n & 0x0000007F) >> 0;
-
- return result;
-}
-
-
-
-/* The CRC code below is based on this document: http://zlib.net/crc_v3.txt */
-static drflac_uint8 drflac__crc8_table[] = {
- 0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15, 0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
- 0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65, 0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
- 0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5, 0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
- 0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85, 0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
- 0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2, 0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
- 0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2, 0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
- 0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32, 0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
- 0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42, 0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
- 0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C, 0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
- 0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC, 0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
- 0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C, 0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
- 0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C, 0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
- 0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B, 0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
- 0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B, 0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
- 0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB, 0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
- 0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB, 0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3
-};
-
-static drflac_uint16 drflac__crc16_table[] = {
- 0x0000, 0x8005, 0x800F, 0x000A, 0x801B, 0x001E, 0x0014, 0x8011,
- 0x8033, 0x0036, 0x003C, 0x8039, 0x0028, 0x802D, 0x8027, 0x0022,
- 0x8063, 0x0066, 0x006C, 0x8069, 0x0078, 0x807D, 0x8077, 0x0072,
- 0x0050, 0x8055, 0x805F, 0x005A, 0x804B, 0x004E, 0x0044, 0x8041,
- 0x80C3, 0x00C6, 0x00CC, 0x80C9, 0x00D8, 0x80DD, 0x80D7, 0x00D2,
- 0x00F0, 0x80F5, 0x80FF, 0x00FA, 0x80EB, 0x00EE, 0x00E4, 0x80E1,
- 0x00A0, 0x80A5, 0x80AF, 0x00AA, 0x80BB, 0x00BE, 0x00B4, 0x80B1,
- 0x8093, 0x0096, 0x009C, 0x8099, 0x0088, 0x808D, 0x8087, 0x0082,
- 0x8183, 0x0186, 0x018C, 0x8189, 0x0198, 0x819D, 0x8197, 0x0192,
- 0x01B0, 0x81B5, 0x81BF, 0x01BA, 0x81AB, 0x01AE, 0x01A4, 0x81A1,
- 0x01E0, 0x81E5, 0x81EF, 0x01EA, 0x81FB, 0x01FE, 0x01F4, 0x81F1,
- 0x81D3, 0x01D6, 0x01DC, 0x81D9, 0x01C8, 0x81CD, 0x81C7, 0x01C2,
- 0x0140, 0x8145, 0x814F, 0x014A, 0x815B, 0x015E, 0x0154, 0x8151,
- 0x8173, 0x0176, 0x017C, 0x8179, 0x0168, 0x816D, 0x8167, 0x0162,
- 0x8123, 0x0126, 0x012C, 0x8129, 0x0138, 0x813D, 0x8137, 0x0132,
- 0x0110, 0x8115, 0x811F, 0x011A, 0x810B, 0x010E, 0x0104, 0x8101,
- 0x8303, 0x0306, 0x030C, 0x8309, 0x0318, 0x831D, 0x8317, 0x0312,
- 0x0330, 0x8335, 0x833F, 0x033A, 0x832B, 0x032E, 0x0324, 0x8321,
- 0x0360, 0x8365, 0x836F, 0x036A, 0x837B, 0x037E, 0x0374, 0x8371,
- 0x8353, 0x0356, 0x035C, 0x8359, 0x0348, 0x834D, 0x8347, 0x0342,
- 0x03C0, 0x83C5, 0x83CF, 0x03CA, 0x83DB, 0x03DE, 0x03D4, 0x83D1,
- 0x83F3, 0x03F6, 0x03FC, 0x83F9, 0x03E8, 0x83ED, 0x83E7, 0x03E2,
- 0x83A3, 0x03A6, 0x03AC, 0x83A9, 0x03B8, 0x83BD, 0x83B7, 0x03B2,
- 0x0390, 0x8395, 0x839F, 0x039A, 0x838B, 0x038E, 0x0384, 0x8381,
- 0x0280, 0x8285, 0x828F, 0x028A, 0x829B, 0x029E, 0x0294, 0x8291,
- 0x82B3, 0x02B6, 0x02BC, 0x82B9, 0x02A8, 0x82AD, 0x82A7, 0x02A2,
- 0x82E3, 0x02E6, 0x02EC, 0x82E9, 0x02F8, 0x82FD, 0x82F7, 0x02F2,
- 0x02D0, 0x82D5, 0x82DF, 0x02DA, 0x82CB, 0x02CE, 0x02C4, 0x82C1,
- 0x8243, 0x0246, 0x024C, 0x8249, 0x0258, 0x825D, 0x8257, 0x0252,
- 0x0270, 0x8275, 0x827F, 0x027A, 0x826B, 0x026E, 0x0264, 0x8261,
- 0x0220, 0x8225, 0x822F, 0x022A, 0x823B, 0x023E, 0x0234, 0x8231,
- 0x8213, 0x0216, 0x021C, 0x8219, 0x0208, 0x820D, 0x8207, 0x0202
-};
-
-static DRFLAC_INLINE drflac_uint8 drflac_crc8_byte(drflac_uint8 crc, drflac_uint8 data)
-{
- return drflac__crc8_table[crc ^ data];
-}
-
-static DRFLAC_INLINE drflac_uint8 drflac_crc8(drflac_uint8 crc, drflac_uint32 data, drflac_uint32 count)
-{
-#ifdef DR_FLAC_NO_CRC
- (void)crc;
- (void)data;
- (void)count;
- return 0;
-#else
-#if 0
- /* REFERENCE (use of this implementation requires an explicit flush by doing "drflac_crc8(crc, 0, 8);") */
- drflac_uint8 p = 0x07;
- for (int i = count-1; i >= 0; --i) {
- drflac_uint8 bit = (data & (1 << i)) >> i;
- if (crc & 0x80) {
- crc = ((crc << 1) | bit) ^ p;
- } else {
- crc = ((crc << 1) | bit);
- }
- }
- return crc;
-#else
- drflac_uint32 wholeBytes;
- drflac_uint32 leftoverBits;
- drflac_uint64 leftoverDataMask;
-
- static drflac_uint64 leftoverDataMaskTable[8] = {
- 0x00, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F
- };
-
- drflac_assert(count <= 32);
-
- wholeBytes = count >> 3;
- leftoverBits = count - (wholeBytes*8);
- leftoverDataMask = leftoverDataMaskTable[leftoverBits];
-
- switch (wholeBytes) {
- case 4: crc = drflac_crc8_byte(crc, (drflac_uint8)((data & (0xFF000000UL << leftoverBits)) >> (24 + leftoverBits)));
- case 3: crc = drflac_crc8_byte(crc, (drflac_uint8)((data & (0x00FF0000UL << leftoverBits)) >> (16 + leftoverBits)));
- case 2: crc = drflac_crc8_byte(crc, (drflac_uint8)((data & (0x0000FF00UL << leftoverBits)) >> ( 8 + leftoverBits)));
- case 1: crc = drflac_crc8_byte(crc, (drflac_uint8)((data & (0x000000FFUL << leftoverBits)) >> ( 0 + leftoverBits)));
- case 0: if (leftoverBits > 0) crc = (crc << leftoverBits) ^ drflac__crc8_table[(crc >> (8 - leftoverBits)) ^ (data & leftoverDataMask)];
- }
- return crc;
-#endif
-#endif
-}
-
-static DRFLAC_INLINE drflac_uint16 drflac_crc16_byte(drflac_uint16 crc, drflac_uint8 data)
-{
- return (crc << 8) ^ drflac__crc16_table[(drflac_uint8)(crc >> 8) ^ data];
-}
-
-static DRFLAC_INLINE drflac_uint16 drflac_crc16_bytes(drflac_uint16 crc, drflac_cache_t data, drflac_uint32 byteCount)
-{
- switch (byteCount)
- {
-#ifdef DRFLAC_64BIT
- case 8: crc = drflac_crc16_byte(crc, (drflac_uint8)((data >> 56) & 0xFF));
- case 7: crc = drflac_crc16_byte(crc, (drflac_uint8)((data >> 48) & 0xFF));
- case 6: crc = drflac_crc16_byte(crc, (drflac_uint8)((data >> 40) & 0xFF));
- case 5: crc = drflac_crc16_byte(crc, (drflac_uint8)((data >> 32) & 0xFF));
-#endif
- case 4: crc = drflac_crc16_byte(crc, (drflac_uint8)((data >> 24) & 0xFF));
- case 3: crc = drflac_crc16_byte(crc, (drflac_uint8)((data >> 16) & 0xFF));
- case 2: crc = drflac_crc16_byte(crc, (drflac_uint8)((data >> 8) & 0xFF));
- case 1: crc = drflac_crc16_byte(crc, (drflac_uint8)((data >> 0) & 0xFF));
- }
-
- return crc;
-}
-
-static DRFLAC_INLINE drflac_uint16 drflac_crc16__32bit(drflac_uint16 crc, drflac_uint32 data, drflac_uint32 count)
-{
-#ifdef DR_FLAC_NO_CRC
- (void)crc;
- (void)data;
- (void)count;
- return 0;
-#else
-#if 0
- /* REFERENCE (use of this implementation requires an explicit flush by doing "drflac_crc16(crc, 0, 16);") */
- drflac_uint16 p = 0x8005;
- for (int i = count-1; i >= 0; --i) {
- drflac_uint16 bit = (data & (1ULL << i)) >> i;
- if (r & 0x8000) {
- r = ((r << 1) | bit) ^ p;
- } else {
- r = ((r << 1) | bit);
- }
- }
-
- return crc;
-#else
- drflac_uint32 wholeBytes;
- drflac_uint32 leftoverBits;
- drflac_uint64 leftoverDataMask;
-
- static drflac_uint64 leftoverDataMaskTable[8] = {
- 0x00, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F
- };
-
- drflac_assert(count <= 64);
-
- wholeBytes = count >> 3;
- leftoverBits = count - (wholeBytes*8);
- leftoverDataMask = leftoverDataMaskTable[leftoverBits];
-
- switch (wholeBytes) {
- default:
- case 4: crc = drflac_crc16_byte(crc, (drflac_uint8)((data & (0xFF000000UL << leftoverBits)) >> (24 + leftoverBits)));
- case 3: crc = drflac_crc16_byte(crc, (drflac_uint8)((data & (0x00FF0000UL << leftoverBits)) >> (16 + leftoverBits)));
- case 2: crc = drflac_crc16_byte(crc, (drflac_uint8)((data & (0x0000FF00UL << leftoverBits)) >> ( 8 + leftoverBits)));
- case 1: crc = drflac_crc16_byte(crc, (drflac_uint8)((data & (0x000000FFUL << leftoverBits)) >> ( 0 + leftoverBits)));
- case 0: if (leftoverBits > 0) crc = (crc << leftoverBits) ^ drflac__crc16_table[(crc >> (16 - leftoverBits)) ^ (data & leftoverDataMask)];
- }
- return crc;
-#endif
-#endif
-}
-
-static DRFLAC_INLINE drflac_uint16 drflac_crc16__64bit(drflac_uint16 crc, drflac_uint64 data, drflac_uint32 count)
-{
-#ifdef DR_FLAC_NO_CRC
- (void)crc;
- (void)data;
- (void)count;
- return 0;
-#else
- drflac_uint32 wholeBytes;
- drflac_uint32 leftoverBits;
- drflac_uint64 leftoverDataMask;
-
- static drflac_uint64 leftoverDataMaskTable[8] = {
- 0x00, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F
- };
-
- drflac_assert(count <= 64);
-
- wholeBytes = count >> 3;
- leftoverBits = count - (wholeBytes*8);
- leftoverDataMask = leftoverDataMaskTable[leftoverBits];
-
- switch (wholeBytes) {
- default:
- case 8: crc = drflac_crc16_byte(crc, (drflac_uint8)((data & (((drflac_uint64)0xFF000000 << 32) << leftoverBits)) >> (56 + leftoverBits))); /* Weird "<< 32" bitshift is required for C89 because it doesn't support 64-bit constants. Should be optimized out by a good compiler. */
- case 7: crc = drflac_crc16_byte(crc, (drflac_uint8)((data & (((drflac_uint64)0x00FF0000 << 32) << leftoverBits)) >> (48 + leftoverBits)));
- case 6: crc = drflac_crc16_byte(crc, (drflac_uint8)((data & (((drflac_uint64)0x0000FF00 << 32) << leftoverBits)) >> (40 + leftoverBits)));
- case 5: crc = drflac_crc16_byte(crc, (drflac_uint8)((data & (((drflac_uint64)0x000000FF << 32) << leftoverBits)) >> (32 + leftoverBits)));
- case 4: crc = drflac_crc16_byte(crc, (drflac_uint8)((data & (((drflac_uint64)0xFF000000 ) << leftoverBits)) >> (24 + leftoverBits)));
- case 3: crc = drflac_crc16_byte(crc, (drflac_uint8)((data & (((drflac_uint64)0x00FF0000 ) << leftoverBits)) >> (16 + leftoverBits)));
- case 2: crc = drflac_crc16_byte(crc, (drflac_uint8)((data & (((drflac_uint64)0x0000FF00 ) << leftoverBits)) >> ( 8 + leftoverBits)));
- case 1: crc = drflac_crc16_byte(crc, (drflac_uint8)((data & (((drflac_uint64)0x000000FF ) << leftoverBits)) >> ( 0 + leftoverBits)));
- case 0: if (leftoverBits > 0) crc = (crc << leftoverBits) ^ drflac__crc16_table[(crc >> (16 - leftoverBits)) ^ (data & leftoverDataMask)];
- }
- return crc;
-#endif
-}
-
-
-static DRFLAC_INLINE drflac_uint16 drflac_crc16(drflac_uint16 crc, drflac_cache_t data, drflac_uint32 count)
-{
-#ifdef DRFLAC_64BIT
- return drflac_crc16__64bit(crc, data, count);
-#else
- return drflac_crc16__32bit(crc, data, count);
-#endif
-}
-
-
-#ifdef DRFLAC_64BIT
-#define drflac__be2host__cache_line drflac__be2host_64
-#else
-#define drflac__be2host__cache_line drflac__be2host_32
-#endif
-
-/*
-BIT READING ATTEMPT #2
-
-This uses a 32- or 64-bit bit-shifted cache - as bits are read, the cache is shifted such that the first valid bit is sitting
-on the most significant bit. It uses the notion of an L1 and L2 cache (borrowed from CPU architecture), where the L1 cache
-is a 32- or 64-bit unsigned integer (depending on whether or not a 32- or 64-bit build is being compiled) and the L2 is an
-array of "cache lines", with each cache line being the same size as the L1. The L2 is a buffer of about 4KB and is where data
-from onRead() is read into.
-*/
-#define DRFLAC_CACHE_L1_SIZE_BYTES(bs) (sizeof((bs)->cache))
-#define DRFLAC_CACHE_L1_SIZE_BITS(bs) (sizeof((bs)->cache)*8)
-#define DRFLAC_CACHE_L1_BITS_REMAINING(bs) (DRFLAC_CACHE_L1_SIZE_BITS(bs) - (bs)->consumedBits)
-#define DRFLAC_CACHE_L1_SELECTION_MASK(_bitCount) (~((~(drflac_cache_t)0) >> (_bitCount)))
-#define DRFLAC_CACHE_L1_SELECTION_SHIFT(bs, _bitCount) (DRFLAC_CACHE_L1_SIZE_BITS(bs) - (_bitCount))
-#define DRFLAC_CACHE_L1_SELECT(bs, _bitCount) (((bs)->cache) & DRFLAC_CACHE_L1_SELECTION_MASK(_bitCount))
-#define DRFLAC_CACHE_L1_SELECT_AND_SHIFT(bs, _bitCount) (DRFLAC_CACHE_L1_SELECT((bs), (_bitCount)) >> DRFLAC_CACHE_L1_SELECTION_SHIFT((bs), (_bitCount)))
-#define DRFLAC_CACHE_L1_SELECT_AND_SHIFT_SAFE(bs, _bitCount)(DRFLAC_CACHE_L1_SELECT((bs), (_bitCount)) >> (DRFLAC_CACHE_L1_SELECTION_SHIFT((bs), (_bitCount)) & (DRFLAC_CACHE_L1_SIZE_BITS(bs)-1)))
-#define DRFLAC_CACHE_L2_SIZE_BYTES(bs) (sizeof((bs)->cacheL2))
-#define DRFLAC_CACHE_L2_LINE_COUNT(bs) (DRFLAC_CACHE_L2_SIZE_BYTES(bs) / sizeof((bs)->cacheL2[0]))
-#define DRFLAC_CACHE_L2_LINES_REMAINING(bs) (DRFLAC_CACHE_L2_LINE_COUNT(bs) - (bs)->nextL2Line)
-
-
-#ifndef DR_FLAC_NO_CRC
-static DRFLAC_INLINE void drflac__reset_crc16(drflac_bs* bs)
-{
- bs->crc16 = 0;
- bs->crc16CacheIgnoredBytes = bs->consumedBits >> 3;
-}
-
-static DRFLAC_INLINE void drflac__update_crc16(drflac_bs* bs)
-{
- bs->crc16 = drflac_crc16_bytes(bs->crc16, bs->crc16Cache, DRFLAC_CACHE_L1_SIZE_BYTES(bs) - bs->crc16CacheIgnoredBytes);
- bs->crc16CacheIgnoredBytes = 0;
-}
-
-static DRFLAC_INLINE drflac_uint16 drflac__flush_crc16(drflac_bs* bs)
-{
- /* We should never be flushing in a situation where we are not aligned on a byte boundary. */
- drflac_assert((DRFLAC_CACHE_L1_BITS_REMAINING(bs) & 7) == 0);
-
- /*
- The bits that were read from the L1 cache need to be accumulated. The number of bytes needing to be accumulated is determined
- by the number of bits that have been consumed.
- */
- if (DRFLAC_CACHE_L1_BITS_REMAINING(bs) == 0) {
- drflac__update_crc16(bs);
- } else {
- /* We only accumulate the consumed bits. */
- bs->crc16 = drflac_crc16_bytes(bs->crc16, bs->crc16Cache >> DRFLAC_CACHE_L1_BITS_REMAINING(bs), (bs->consumedBits >> 3) - bs->crc16CacheIgnoredBytes);
-
- /*
- The bits that we just accumulated should never be accumulated again. We need to keep track of how many bytes were accumulated
- so we can handle that later.
- */
- bs->crc16CacheIgnoredBytes = bs->consumedBits >> 3;
- }
-
- return bs->crc16;
-}
-#endif
-
-static DRFLAC_INLINE drflac_bool32 drflac__reload_l1_cache_from_l2(drflac_bs* bs)
-{
- size_t bytesRead;
- size_t alignedL1LineCount;
-
- /* Fast path. Try loading straight from L2. */
- if (bs->nextL2Line < DRFLAC_CACHE_L2_LINE_COUNT(bs)) {
- bs->cache = bs->cacheL2[bs->nextL2Line++];
- return DRFLAC_TRUE;
- }
-
- /*
- If we get here it means we've run out of data in the L2 cache. We'll need to fetch more from the client, if there's
- any left.
- */
- if (bs->unalignedByteCount > 0) {
- return DRFLAC_FALSE; /* If we have any unaligned bytes it means there's no more aligned bytes left in the client. */
- }
-
- bytesRead = bs->onRead(bs->pUserData, bs->cacheL2, DRFLAC_CACHE_L2_SIZE_BYTES(bs));
-
- bs->nextL2Line = 0;
- if (bytesRead == DRFLAC_CACHE_L2_SIZE_BYTES(bs)) {
- bs->cache = bs->cacheL2[bs->nextL2Line++];
- return DRFLAC_TRUE;
- }
-
-
- /*
- If we get here it means we were unable to retrieve enough data to fill the entire L2 cache. It probably
- means we've just reached the end of the file. We need to move the valid data down to the end of the buffer
- and adjust the index of the next line accordingly. Also keep in mind that the L2 cache must be aligned to
- the size of the L1 so we'll need to seek backwards by any misaligned bytes.
- */
- alignedL1LineCount = bytesRead / DRFLAC_CACHE_L1_SIZE_BYTES(bs);
-
- /* We need to keep track of any unaligned bytes for later use. */
- bs->unalignedByteCount = bytesRead - (alignedL1LineCount * DRFLAC_CACHE_L1_SIZE_BYTES(bs));
- if (bs->unalignedByteCount > 0) {
- bs->unalignedCache = bs->cacheL2[alignedL1LineCount];
- }
-
- if (alignedL1LineCount > 0) {
- size_t offset = DRFLAC_CACHE_L2_LINE_COUNT(bs) - alignedL1LineCount;
- size_t i;
- for (i = alignedL1LineCount; i > 0; --i) {
- bs->cacheL2[i-1 + offset] = bs->cacheL2[i-1];
- }
-
- bs->nextL2Line = (drflac_uint32)offset;
- bs->cache = bs->cacheL2[bs->nextL2Line++];
- return DRFLAC_TRUE;
- } else {
- /* If we get into this branch it means we weren't able to load any L1-aligned data. */
- bs->nextL2Line = DRFLAC_CACHE_L2_LINE_COUNT(bs);
- return DRFLAC_FALSE;
- }
-}
-
-static drflac_bool32 drflac__reload_cache(drflac_bs* bs)
-{
- size_t bytesRead;
-
-#ifndef DR_FLAC_NO_CRC
- drflac__update_crc16(bs);
-#endif
-
- /* Fast path. Try just moving the next value in the L2 cache to the L1 cache. */
- if (drflac__reload_l1_cache_from_l2(bs)) {
- bs->cache = drflac__be2host__cache_line(bs->cache);
- bs->consumedBits = 0;
-#ifndef DR_FLAC_NO_CRC
- bs->crc16Cache = bs->cache;
-#endif
- return DRFLAC_TRUE;
- }
-
- /* Slow path. */
-
- /*
- If we get here it means we have failed to load the L1 cache from the L2. Likely we've just reached the end of the stream and the last
- few bytes did not meet the alignment requirements for the L2 cache. In this case we need to fall back to a slower path and read the
- data from the unaligned cache.
- */
- bytesRead = bs->unalignedByteCount;
- if (bytesRead == 0) {
- bs->consumedBits = DRFLAC_CACHE_L1_SIZE_BITS(bs); /* <-- The stream has been exhausted, so marked the bits as consumed. */
- return DRFLAC_FALSE;
- }
-
- drflac_assert(bytesRead < DRFLAC_CACHE_L1_SIZE_BYTES(bs));
- bs->consumedBits = (drflac_uint32)(DRFLAC_CACHE_L1_SIZE_BYTES(bs) - bytesRead) * 8;
-
- bs->cache = drflac__be2host__cache_line(bs->unalignedCache);
- bs->cache &= DRFLAC_CACHE_L1_SELECTION_MASK(DRFLAC_CACHE_L1_BITS_REMAINING(bs)); /* <-- Make sure the consumed bits are always set to zero. Other parts of the library depend on this property. */
- bs->unalignedByteCount = 0; /* <-- At this point the unaligned bytes have been moved into the cache and we thus have no more unaligned bytes. */
-
-#ifndef DR_FLAC_NO_CRC
- bs->crc16Cache = bs->cache >> bs->consumedBits;
- bs->crc16CacheIgnoredBytes = bs->consumedBits >> 3;
-#endif
- return DRFLAC_TRUE;
-}
-
-static void drflac__reset_cache(drflac_bs* bs)
-{
- bs->nextL2Line = DRFLAC_CACHE_L2_LINE_COUNT(bs); /* <-- This clears the L2 cache. */
- bs->consumedBits = DRFLAC_CACHE_L1_SIZE_BITS(bs); /* <-- This clears the L1 cache. */
- bs->cache = 0;
- bs->unalignedByteCount = 0; /* <-- This clears the trailing unaligned bytes. */
- bs->unalignedCache = 0;
-
-#ifndef DR_FLAC_NO_CRC
- bs->crc16Cache = 0;
- bs->crc16CacheIgnoredBytes = 0;
-#endif
-}
-
-
-static DRFLAC_INLINE drflac_bool32 drflac__read_uint32(drflac_bs* bs, unsigned int bitCount, drflac_uint32* pResultOut)
-{
- drflac_assert(bs != NULL);
- drflac_assert(pResultOut != NULL);
- drflac_assert(bitCount > 0);
- drflac_assert(bitCount <= 32);
-
- if (bs->consumedBits == DRFLAC_CACHE_L1_SIZE_BITS(bs)) {
- if (!drflac__reload_cache(bs)) {
- return DRFLAC_FALSE;
- }
- }
-
- if (bitCount <= DRFLAC_CACHE_L1_BITS_REMAINING(bs)) {
- /*
- If we want to load all 32-bits from a 32-bit cache we need to do it slightly differently because we can't do
- a 32-bit shift on a 32-bit integer. This will never be the case on 64-bit caches, so we can have a slightly
- more optimal solution for this.
- */
-#ifdef DRFLAC_64BIT
- *pResultOut = (drflac_uint32)DRFLAC_CACHE_L1_SELECT_AND_SHIFT(bs, bitCount);
- bs->consumedBits += bitCount;
- bs->cache <<= bitCount;
-#else
- if (bitCount < DRFLAC_CACHE_L1_SIZE_BITS(bs)) {
- *pResultOut = (drflac_uint32)DRFLAC_CACHE_L1_SELECT_AND_SHIFT(bs, bitCount);
- bs->consumedBits += bitCount;
- bs->cache <<= bitCount;
- } else {
- /* Cannot shift by 32-bits, so need to do it differently. */
- *pResultOut = (drflac_uint32)bs->cache;
- bs->consumedBits = DRFLAC_CACHE_L1_SIZE_BITS(bs);
- bs->cache = 0;
- }
-#endif
-
- return DRFLAC_TRUE;
- } else {
- /* It straddles the cached data. It will never cover more than the next chunk. We just read the number in two parts and combine them. */
- drflac_uint32 bitCountHi = DRFLAC_CACHE_L1_BITS_REMAINING(bs);
- drflac_uint32 bitCountLo = bitCount - bitCountHi;
- drflac_uint32 resultHi = (drflac_uint32)DRFLAC_CACHE_L1_SELECT_AND_SHIFT(bs, bitCountHi);
-
- if (!drflac__reload_cache(bs)) {
- return DRFLAC_FALSE;
- }
-
- *pResultOut = (resultHi << bitCountLo) | (drflac_uint32)DRFLAC_CACHE_L1_SELECT_AND_SHIFT(bs, bitCountLo);
- bs->consumedBits += bitCountLo;
- bs->cache <<= bitCountLo;
- return DRFLAC_TRUE;
- }
-}
-
-static drflac_bool32 drflac__read_int32(drflac_bs* bs, unsigned int bitCount, drflac_int32* pResult)
-{
- drflac_uint32 result;
- drflac_uint32 signbit;
-
- drflac_assert(bs != NULL);
- drflac_assert(pResult != NULL);
- drflac_assert(bitCount > 0);
- drflac_assert(bitCount <= 32);
-
- if (!drflac__read_uint32(bs, bitCount, &result)) {
- return DRFLAC_FALSE;
- }
-
- signbit = ((result >> (bitCount-1)) & 0x01);
- result |= (~signbit + 1) << bitCount;
-
- *pResult = (drflac_int32)result;
- return DRFLAC_TRUE;
-}
-
-#ifdef DRFLAC_64BIT
-static drflac_bool32 drflac__read_uint64(drflac_bs* bs, unsigned int bitCount, drflac_uint64* pResultOut)
-{
- drflac_uint32 resultHi;
- drflac_uint32 resultLo;
-
- drflac_assert(bitCount <= 64);
- drflac_assert(bitCount > 32);
-
- if (!drflac__read_uint32(bs, bitCount - 32, &resultHi)) {
- return DRFLAC_FALSE;
- }
-
- if (!drflac__read_uint32(bs, 32, &resultLo)) {
- return DRFLAC_FALSE;
- }
-
- *pResultOut = (((drflac_uint64)resultHi) << 32) | ((drflac_uint64)resultLo);
- return DRFLAC_TRUE;
-}
-#endif
-
-/* Function below is unused, but leaving it here in case I need to quickly add it again. */
-#if 0
-static drflac_bool32 drflac__read_int64(drflac_bs* bs, unsigned int bitCount, drflac_int64* pResultOut)
-{
- drflac_uint64 result;
- drflac_uint64 signbit;
-
- drflac_assert(bitCount <= 64);
-
- if (!drflac__read_uint64(bs, bitCount, &result)) {
- return DRFLAC_FALSE;
- }
-
- signbit = ((result >> (bitCount-1)) & 0x01);
- result |= (~signbit + 1) << bitCount;
-
- *pResultOut = (drflac_int64)result;
- return DRFLAC_TRUE;
-}
-#endif
-
-static drflac_bool32 drflac__read_uint16(drflac_bs* bs, unsigned int bitCount, drflac_uint16* pResult)
-{
- drflac_uint32 result;
-
- drflac_assert(bs != NULL);
- drflac_assert(pResult != NULL);
- drflac_assert(bitCount > 0);
- drflac_assert(bitCount <= 16);
-
- if (!drflac__read_uint32(bs, bitCount, &result)) {
- return DRFLAC_FALSE;
- }
-
- *pResult = (drflac_uint16)result;
- return DRFLAC_TRUE;
-}
-
-#if 0
-static drflac_bool32 drflac__read_int16(drflac_bs* bs, unsigned int bitCount, drflac_int16* pResult)
-{
- drflac_int32 result;
-
- drflac_assert(bs != NULL);
- drflac_assert(pResult != NULL);
- drflac_assert(bitCount > 0);
- drflac_assert(bitCount <= 16);
-
- if (!drflac__read_int32(bs, bitCount, &result)) {
- return DRFLAC_FALSE;
- }
-
- *pResult = (drflac_int16)result;
- return DRFLAC_TRUE;
-}
-#endif
-
-static drflac_bool32 drflac__read_uint8(drflac_bs* bs, unsigned int bitCount, drflac_uint8* pResult)
-{
- drflac_uint32 result;
-
- drflac_assert(bs != NULL);
- drflac_assert(pResult != NULL);
- drflac_assert(bitCount > 0);
- drflac_assert(bitCount <= 8);
-
- if (!drflac__read_uint32(bs, bitCount, &result)) {
- return DRFLAC_FALSE;
- }
-
- *pResult = (drflac_uint8)result;
- return DRFLAC_TRUE;
-}
-
-static drflac_bool32 drflac__read_int8(drflac_bs* bs, unsigned int bitCount, drflac_int8* pResult)
-{
- drflac_int32 result;
-
- drflac_assert(bs != NULL);
- drflac_assert(pResult != NULL);
- drflac_assert(bitCount > 0);
- drflac_assert(bitCount <= 8);
-
- if (!drflac__read_int32(bs, bitCount, &result)) {
- return DRFLAC_FALSE;
- }
-
- *pResult = (drflac_int8)result;
- return DRFLAC_TRUE;
-}
-
-
-static drflac_bool32 drflac__seek_bits(drflac_bs* bs, size_t bitsToSeek)
-{
- if (bitsToSeek <= DRFLAC_CACHE_L1_BITS_REMAINING(bs)) {
- bs->consumedBits += (drflac_uint32)bitsToSeek;
- bs->cache <<= bitsToSeek;
- return DRFLAC_TRUE;
- } else {
- /* It straddles the cached data. This function isn't called too frequently so I'm favouring simplicity here. */
- bitsToSeek -= DRFLAC_CACHE_L1_BITS_REMAINING(bs);
- bs->consumedBits += DRFLAC_CACHE_L1_BITS_REMAINING(bs);
- bs->cache = 0;
-
- /* Simple case. Seek in groups of the same number as bits that fit within a cache line. */
-#ifdef DRFLAC_64BIT
- while (bitsToSeek >= DRFLAC_CACHE_L1_SIZE_BITS(bs)) {
- drflac_uint64 bin;
- if (!drflac__read_uint64(bs, DRFLAC_CACHE_L1_SIZE_BITS(bs), &bin)) {
- return DRFLAC_FALSE;
- }
- bitsToSeek -= DRFLAC_CACHE_L1_SIZE_BITS(bs);
- }
-#else
- while (bitsToSeek >= DRFLAC_CACHE_L1_SIZE_BITS(bs)) {
- drflac_uint32 bin;
- if (!drflac__read_uint32(bs, DRFLAC_CACHE_L1_SIZE_BITS(bs), &bin)) {
- return DRFLAC_FALSE;
- }
- bitsToSeek -= DRFLAC_CACHE_L1_SIZE_BITS(bs);
- }
-#endif
-
- /* Whole leftover bytes. */
- while (bitsToSeek >= 8) {
- drflac_uint8 bin;
- if (!drflac__read_uint8(bs, 8, &bin)) {
- return DRFLAC_FALSE;
- }
- bitsToSeek -= 8;
- }
-
- /* Leftover bits. */
- if (bitsToSeek > 0) {
- drflac_uint8 bin;
- if (!drflac__read_uint8(bs, (drflac_uint32)bitsToSeek, &bin)) {
- return DRFLAC_FALSE;
- }
- bitsToSeek = 0; /* <-- Necessary for the assert below. */
- }
-
- drflac_assert(bitsToSeek == 0);
- return DRFLAC_TRUE;
- }
-}
-
-
-/* This function moves the bit streamer to the first bit after the sync code (bit 15 of the of the frame header). It will also update the CRC-16. */
-static drflac_bool32 drflac__find_and_seek_to_next_sync_code(drflac_bs* bs)
-{
- drflac_assert(bs != NULL);
-
- /*
- The sync code is always aligned to 8 bits. This is convenient for us because it means we can do byte-aligned movements. The first
- thing to do is align to the next byte.
- */
- if (!drflac__seek_bits(bs, DRFLAC_CACHE_L1_BITS_REMAINING(bs) & 7)) {
- return DRFLAC_FALSE;
- }
-
- for (;;) {
- drflac_uint8 hi;
-
-#ifndef DR_FLAC_NO_CRC
- drflac__reset_crc16(bs);
-#endif
-
- if (!drflac__read_uint8(bs, 8, &hi)) {
- return DRFLAC_FALSE;
- }
-
- if (hi == 0xFF) {
- drflac_uint8 lo;
- if (!drflac__read_uint8(bs, 6, &lo)) {
- return DRFLAC_FALSE;
- }
-
- if (lo == 0x3E) {
- return DRFLAC_TRUE;
- } else {
- if (!drflac__seek_bits(bs, DRFLAC_CACHE_L1_BITS_REMAINING(bs) & 7)) {
- return DRFLAC_FALSE;
- }
- }
- }
- }
-
- /* Should never get here. */
- /*return DRFLAC_FALSE;*/
-}
-
-
-#if !defined(DR_FLAC_NO_SIMD) && defined(DRFLAC_HAS_LZCNT_INTRINSIC)
-#define DRFLAC_IMPLEMENT_CLZ_LZCNT
-#endif
-#if defined(_MSC_VER) && _MSC_VER >= 1400 && (defined(DRFLAC_X64) || defined(DRFLAC_X86))
-#define DRFLAC_IMPLEMENT_CLZ_MSVC
-#endif
-
-static DRFLAC_INLINE drflac_uint32 drflac__clz_software(drflac_cache_t x)
-{
- drflac_uint32 n;
- static drflac_uint32 clz_table_4[] = {
- 0,
- 4,
- 3, 3,
- 2, 2, 2, 2,
- 1, 1, 1, 1, 1, 1, 1, 1
- };
-
- if (x == 0) {
- return sizeof(x)*8;
- }
-
- n = clz_table_4[x >> (sizeof(x)*8 - 4)];
- if (n == 0) {
-#ifdef DRFLAC_64BIT
- if ((x & ((drflac_uint64)0xFFFFFFFF << 32)) == 0) { n = 32; x <<= 32; }
- if ((x & ((drflac_uint64)0xFFFF0000 << 32)) == 0) { n += 16; x <<= 16; }
- if ((x & ((drflac_uint64)0xFF000000 << 32)) == 0) { n += 8; x <<= 8; }
- if ((x & ((drflac_uint64)0xF0000000 << 32)) == 0) { n += 4; x <<= 4; }
-#else
- if ((x & 0xFFFF0000) == 0) { n = 16; x <<= 16; }
- if ((x & 0xFF000000) == 0) { n += 8; x <<= 8; }
- if ((x & 0xF0000000) == 0) { n += 4; x <<= 4; }
-#endif
- n += clz_table_4[x >> (sizeof(x)*8 - 4)];
- }
-
- return n - 1;
-}
-
-#ifdef DRFLAC_IMPLEMENT_CLZ_LZCNT
-static DRFLAC_INLINE drflac_bool32 drflac__is_lzcnt_supported()
-{
- /* If the compiler itself does not support the intrinsic then we'll need to return false. */
-#ifdef DRFLAC_HAS_LZCNT_INTRINSIC
- return drflac__gIsLZCNTSupported;
-#else
- return DRFLAC_FALSE;
-#endif
-}
-
-static DRFLAC_INLINE drflac_uint32 drflac__clz_lzcnt(drflac_cache_t x)
-{
-#if defined(_MSC_VER) && !defined(__clang__)
- #ifdef DRFLAC_64BIT
- return (drflac_uint32)__lzcnt64(x);
- #else
- return (drflac_uint32)__lzcnt(x);
- #endif
-#else
- #if defined(__GNUC__) || defined(__clang__)
- if (x == 0) {
- return sizeof(x)*8;
- }
- #ifdef DRFLAC_64BIT
- return (drflac_uint32)__builtin_clzll((drflac_uint64)x);
- #else
- return (drflac_uint32)__builtin_clzl((drflac_uint32)x);
- #endif
- #else
- /* Unsupported compiler. */
- #error "This compiler does not support the lzcnt intrinsic."
- #endif
-#endif
-}
-#endif
-
-#ifdef DRFLAC_IMPLEMENT_CLZ_MSVC
-#include <intrin.h> /* For BitScanReverse(). */
-
-static DRFLAC_INLINE drflac_uint32 drflac__clz_msvc(drflac_cache_t x)
-{
- drflac_uint32 n;
-
- if (x == 0) {
- return sizeof(x)*8;
- }
-
-#ifdef DRFLAC_64BIT
- _BitScanReverse64((unsigned long*)&n, x);
-#else
- _BitScanReverse((unsigned long*)&n, x);
-#endif
- return sizeof(x)*8 - n - 1;
-}
-#endif
-
-static DRFLAC_INLINE drflac_uint32 drflac__clz(drflac_cache_t x)
-{
-#ifdef DRFLAC_IMPLEMENT_CLZ_LZCNT
- if (drflac__is_lzcnt_supported()) {
- return drflac__clz_lzcnt(x);
- } else
-#endif
- {
-#ifdef DRFLAC_IMPLEMENT_CLZ_MSVC
- return drflac__clz_msvc(x);
-#else
- return drflac__clz_software(x);
-#endif
- }
-}
-
-
-static DRFLAC_INLINE drflac_bool32 drflac__seek_past_next_set_bit(drflac_bs* bs, unsigned int* pOffsetOut)
-{
- drflac_uint32 zeroCounter = 0;
- drflac_uint32 setBitOffsetPlus1;
-
- while (bs->cache == 0) {
- zeroCounter += (drflac_uint32)DRFLAC_CACHE_L1_BITS_REMAINING(bs);
- if (!drflac__reload_cache(bs)) {
- return DRFLAC_FALSE;
- }
- }
-
- setBitOffsetPlus1 = drflac__clz(bs->cache);
- setBitOffsetPlus1 += 1;
-
- bs->consumedBits += setBitOffsetPlus1;
- bs->cache <<= setBitOffsetPlus1;
-
- *pOffsetOut = zeroCounter + setBitOffsetPlus1 - 1;
- return DRFLAC_TRUE;
-}
-
-
-
-static drflac_bool32 drflac__seek_to_byte(drflac_bs* bs, drflac_uint64 offsetFromStart)
-{
- drflac_assert(bs != NULL);
- drflac_assert(offsetFromStart > 0);
-
- /*
- Seeking from the start is not quite as trivial as it sounds because the onSeek callback takes a signed 32-bit integer (which
- is intentional because it simplifies the implementation of the onSeek callbacks), however offsetFromStart is unsigned 64-bit.
- To resolve we just need to do an initial seek from the start, and then a series of offset seeks to make up the remainder.
- */
- if (offsetFromStart > 0x7FFFFFFF) {
- drflac_uint64 bytesRemaining = offsetFromStart;
- if (!bs->onSeek(bs->pUserData, 0x7FFFFFFF, drflac_seek_origin_start)) {
- return DRFLAC_FALSE;
- }
- bytesRemaining -= 0x7FFFFFFF;
-
- while (bytesRemaining > 0x7FFFFFFF) {
- if (!bs->onSeek(bs->pUserData, 0x7FFFFFFF, drflac_seek_origin_current)) {
- return DRFLAC_FALSE;
- }
- bytesRemaining -= 0x7FFFFFFF;
- }
-
- if (bytesRemaining > 0) {
- if (!bs->onSeek(bs->pUserData, (int)bytesRemaining, drflac_seek_origin_current)) {
- return DRFLAC_FALSE;
- }
- }
- } else {
- if (!bs->onSeek(bs->pUserData, (int)offsetFromStart, drflac_seek_origin_start)) {
- return DRFLAC_FALSE;
- }
- }
-
- /* The cache should be reset to force a reload of fresh data from the client. */
- drflac__reset_cache(bs);
- return DRFLAC_TRUE;
-}
-
-
-static drflac_result drflac__read_utf8_coded_number(drflac_bs* bs, drflac_uint64* pNumberOut, drflac_uint8* pCRCOut)
-{
- drflac_uint8 crc;
- drflac_uint64 result;
- unsigned char utf8[7] = {0};
- int byteCount;
- int i;
-
- drflac_assert(bs != NULL);
- drflac_assert(pNumberOut != NULL);
- drflac_assert(pCRCOut != NULL);
-
- crc = *pCRCOut;
-
- if (!drflac__read_uint8(bs, 8, utf8)) {
- *pNumberOut = 0;
- return DRFLAC_END_OF_STREAM;
- }
- crc = drflac_crc8(crc, utf8[0], 8);
-
- if ((utf8[0] & 0x80) == 0) {
- *pNumberOut = utf8[0];
- *pCRCOut = crc;
- return DRFLAC_SUCCESS;
- }
-
- byteCount = 1;
- if ((utf8[0] & 0xE0) == 0xC0) {
- byteCount = 2;
- } else if ((utf8[0] & 0xF0) == 0xE0) {
- byteCount = 3;
- } else if ((utf8[0] & 0xF8) == 0xF0) {
- byteCount = 4;
- } else if ((utf8[0] & 0xFC) == 0xF8) {
- byteCount = 5;
- } else if ((utf8[0] & 0xFE) == 0xFC) {
- byteCount = 6;
- } else if ((utf8[0] & 0xFF) == 0xFE) {
- byteCount = 7;
- } else {
- *pNumberOut = 0;
- return DRFLAC_CRC_MISMATCH; /* Bad UTF-8 encoding. */
- }
-
- /* Read extra bytes. */
- drflac_assert(byteCount > 1);
-
- result = (drflac_uint64)(utf8[0] & (0xFF >> (byteCount + 1)));
- for (i = 1; i < byteCount; ++i) {
- if (!drflac__read_uint8(bs, 8, utf8 + i)) {
- *pNumberOut = 0;
- return DRFLAC_END_OF_STREAM;
- }
- crc = drflac_crc8(crc, utf8[i], 8);
-
- result = (result << 6) | (utf8[i] & 0x3F);
- }
-
- *pNumberOut = result;
- *pCRCOut = crc;
- return DRFLAC_SUCCESS;
-}
-
-
-
-/*
-The next two functions are responsible for calculating the prediction.
-
-When the bits per sample is >16 we need to use 64-bit integer arithmetic because otherwise we'll run out of precision. It's
-safe to assume this will be slower on 32-bit platforms so we use a more optimal solution when the bits per sample is <=16.
-*/
-static DRFLAC_INLINE drflac_int32 drflac__calculate_prediction_32(drflac_uint32 order, drflac_int32 shift, const drflac_int32* coefficients, drflac_int32* pDecodedSamples)
-{
- drflac_int32 prediction = 0;
-
- drflac_assert(order <= 32);
-
- /* 32-bit version. */
-
- /* VC++ optimizes this to a single jmp. I've not yet verified this for other compilers. */
- switch (order)
- {
- case 32: prediction += coefficients[31] * pDecodedSamples[-32];
- case 31: prediction += coefficients[30] * pDecodedSamples[-31];
- case 30: prediction += coefficients[29] * pDecodedSamples[-30];
- case 29: prediction += coefficients[28] * pDecodedSamples[-29];
- case 28: prediction += coefficients[27] * pDecodedSamples[-28];
- case 27: prediction += coefficients[26] * pDecodedSamples[-27];
- case 26: prediction += coefficients[25] * pDecodedSamples[-26];
- case 25: prediction += coefficients[24] * pDecodedSamples[-25];
- case 24: prediction += coefficients[23] * pDecodedSamples[-24];
- case 23: prediction += coefficients[22] * pDecodedSamples[-23];
- case 22: prediction += coefficients[21] * pDecodedSamples[-22];
- case 21: prediction += coefficients[20] * pDecodedSamples[-21];
- case 20: prediction += coefficients[19] * pDecodedSamples[-20];
- case 19: prediction += coefficients[18] * pDecodedSamples[-19];
- case 18: prediction += coefficients[17] * pDecodedSamples[-18];
- case 17: prediction += coefficients[16] * pDecodedSamples[-17];
- case 16: prediction += coefficients[15] * pDecodedSamples[-16];
- case 15: prediction += coefficients[14] * pDecodedSamples[-15];
- case 14: prediction += coefficients[13] * pDecodedSamples[-14];
- case 13: prediction += coefficients[12] * pDecodedSamples[-13];
- case 12: prediction += coefficients[11] * pDecodedSamples[-12];
- case 11: prediction += coefficients[10] * pDecodedSamples[-11];
- case 10: prediction += coefficients[ 9] * pDecodedSamples[-10];
- case 9: prediction += coefficients[ 8] * pDecodedSamples[- 9];
- case 8: prediction += coefficients[ 7] * pDecodedSamples[- 8];
- case 7: prediction += coefficients[ 6] * pDecodedSamples[- 7];
- case 6: prediction += coefficients[ 5] * pDecodedSamples[- 6];
- case 5: prediction += coefficients[ 4] * pDecodedSamples[- 5];
- case 4: prediction += coefficients[ 3] * pDecodedSamples[- 4];
- case 3: prediction += coefficients[ 2] * pDecodedSamples[- 3];
- case 2: prediction += coefficients[ 1] * pDecodedSamples[- 2];
- case 1: prediction += coefficients[ 0] * pDecodedSamples[- 1];
- }
-
- return (drflac_int32)(prediction >> shift);
-}
-
-static DRFLAC_INLINE drflac_int32 drflac__calculate_prediction_64(drflac_uint32 order, drflac_int32 shift, const drflac_int32* coefficients, drflac_int32* pDecodedSamples)
-{
- drflac_int64 prediction;
-
- drflac_assert(order <= 32);
-
- /* 64-bit version. */
-
- /* This method is faster on the 32-bit build when compiling with VC++. See note below. */
-#ifndef DRFLAC_64BIT
- if (order == 8)
- {
- prediction = coefficients[0] * (drflac_int64)pDecodedSamples[-1];
- prediction += coefficients[1] * (drflac_int64)pDecodedSamples[-2];
- prediction += coefficients[2] * (drflac_int64)pDecodedSamples[-3];
- prediction += coefficients[3] * (drflac_int64)pDecodedSamples[-4];
- prediction += coefficients[4] * (drflac_int64)pDecodedSamples[-5];
- prediction += coefficients[5] * (drflac_int64)pDecodedSamples[-6];
- prediction += coefficients[6] * (drflac_int64)pDecodedSamples[-7];
- prediction += coefficients[7] * (drflac_int64)pDecodedSamples[-8];
- }
- else if (order == 7)
- {
- prediction = coefficients[0] * (drflac_int64)pDecodedSamples[-1];
- prediction += coefficients[1] * (drflac_int64)pDecodedSamples[-2];
- prediction += coefficients[2] * (drflac_int64)pDecodedSamples[-3];
- prediction += coefficients[3] * (drflac_int64)pDecodedSamples[-4];
- prediction += coefficients[4] * (drflac_int64)pDecodedSamples[-5];
- prediction += coefficients[5] * (drflac_int64)pDecodedSamples[-6];
- prediction += coefficients[6] * (drflac_int64)pDecodedSamples[-7];
- }
- else if (order == 3)
- {
- prediction = coefficients[0] * (drflac_int64)pDecodedSamples[-1];
- prediction += coefficients[1] * (drflac_int64)pDecodedSamples[-2];
- prediction += coefficients[2] * (drflac_int64)pDecodedSamples[-3];
- }
- else if (order == 6)
- {
- prediction = coefficients[0] * (drflac_int64)pDecodedSamples[-1];
- prediction += coefficients[1] * (drflac_int64)pDecodedSamples[-2];
- prediction += coefficients[2] * (drflac_int64)pDecodedSamples[-3];
- prediction += coefficients[3] * (drflac_int64)pDecodedSamples[-4];
- prediction += coefficients[4] * (drflac_int64)pDecodedSamples[-5];
- prediction += coefficients[5] * (drflac_int64)pDecodedSamples[-6];
- }
- else if (order == 5)
- {
- prediction = coefficients[0] * (drflac_int64)pDecodedSamples[-1];
- prediction += coefficients[1] * (drflac_int64)pDecodedSamples[-2];
- prediction += coefficients[2] * (drflac_int64)pDecodedSamples[-3];
- prediction += coefficients[3] * (drflac_int64)pDecodedSamples[-4];
- prediction += coefficients[4] * (drflac_int64)pDecodedSamples[-5];
- }
- else if (order == 4)
- {
- prediction = coefficients[0] * (drflac_int64)pDecodedSamples[-1];
- prediction += coefficients[1] * (drflac_int64)pDecodedSamples[-2];
- prediction += coefficients[2] * (drflac_int64)pDecodedSamples[-3];
- prediction += coefficients[3] * (drflac_int64)pDecodedSamples[-4];
- }
- else if (order == 12)
- {
- prediction = coefficients[0] * (drflac_int64)pDecodedSamples[-1];
- prediction += coefficients[1] * (drflac_int64)pDecodedSamples[-2];
- prediction += coefficients[2] * (drflac_int64)pDecodedSamples[-3];
- prediction += coefficients[3] * (drflac_int64)pDecodedSamples[-4];
- prediction += coefficients[4] * (drflac_int64)pDecodedSamples[-5];
- prediction += coefficients[5] * (drflac_int64)pDecodedSamples[-6];
- prediction += coefficients[6] * (drflac_int64)pDecodedSamples[-7];
- prediction += coefficients[7] * (drflac_int64)pDecodedSamples[-8];
- prediction += coefficients[8] * (drflac_int64)pDecodedSamples[-9];
- prediction += coefficients[9] * (drflac_int64)pDecodedSamples[-10];
- prediction += coefficients[10] * (drflac_int64)pDecodedSamples[-11];
- prediction += coefficients[11] * (drflac_int64)pDecodedSamples[-12];
- }
- else if (order == 2)
- {
- prediction = coefficients[0] * (drflac_int64)pDecodedSamples[-1];
- prediction += coefficients[1] * (drflac_int64)pDecodedSamples[-2];
- }
- else if (order == 1)
- {
- prediction = coefficients[0] * (drflac_int64)pDecodedSamples[-1];
- }
- else if (order == 10)
- {
- prediction = coefficients[0] * (drflac_int64)pDecodedSamples[-1];
- prediction += coefficients[1] * (drflac_int64)pDecodedSamples[-2];
- prediction += coefficients[2] * (drflac_int64)pDecodedSamples[-3];
- prediction += coefficients[3] * (drflac_int64)pDecodedSamples[-4];
- prediction += coefficients[4] * (drflac_int64)pDecodedSamples[-5];
- prediction += coefficients[5] * (drflac_int64)pDecodedSamples[-6];
- prediction += coefficients[6] * (drflac_int64)pDecodedSamples[-7];
- prediction += coefficients[7] * (drflac_int64)pDecodedSamples[-8];
- prediction += coefficients[8] * (drflac_int64)pDecodedSamples[-9];
- prediction += coefficients[9] * (drflac_int64)pDecodedSamples[-10];
- }
- else if (order == 9)
- {
- prediction = coefficients[0] * (drflac_int64)pDecodedSamples[-1];
- prediction += coefficients[1] * (drflac_int64)pDecodedSamples[-2];
- prediction += coefficients[2] * (drflac_int64)pDecodedSamples[-3];
- prediction += coefficients[3] * (drflac_int64)pDecodedSamples[-4];
- prediction += coefficients[4] * (drflac_int64)pDecodedSamples[-5];
- prediction += coefficients[5] * (drflac_int64)pDecodedSamples[-6];
- prediction += coefficients[6] * (drflac_int64)pDecodedSamples[-7];
- prediction += coefficients[7] * (drflac_int64)pDecodedSamples[-8];
- prediction += coefficients[8] * (drflac_int64)pDecodedSamples[-9];
- }
- else if (order == 11)
- {
- prediction = coefficients[0] * (drflac_int64)pDecodedSamples[-1];
- prediction += coefficients[1] * (drflac_int64)pDecodedSamples[-2];
- prediction += coefficients[2] * (drflac_int64)pDecodedSamples[-3];
- prediction += coefficients[3] * (drflac_int64)pDecodedSamples[-4];
- prediction += coefficients[4] * (drflac_int64)pDecodedSamples[-5];
- prediction += coefficients[5] * (drflac_int64)pDecodedSamples[-6];
- prediction += coefficients[6] * (drflac_int64)pDecodedSamples[-7];
- prediction += coefficients[7] * (drflac_int64)pDecodedSamples[-8];
- prediction += coefficients[8] * (drflac_int64)pDecodedSamples[-9];
- prediction += coefficients[9] * (drflac_int64)pDecodedSamples[-10];
- prediction += coefficients[10] * (drflac_int64)pDecodedSamples[-11];
- }
- else
- {
- int j;
-
- prediction = 0;
- for (j = 0; j < (int)order; ++j) {
- prediction += coefficients[j] * (drflac_int64)pDecodedSamples[-j-1];
- }
- }
-#endif
-
- /*
- VC++ optimizes this to a single jmp instruction, but only the 64-bit build. The 32-bit build generates less efficient code for some
- reason. The ugly version above is faster so we'll just switch between the two depending on the target platform.
- */
-#ifdef DRFLAC_64BIT
- prediction = 0;
- switch (order)
- {
- case 32: prediction += coefficients[31] * (drflac_int64)pDecodedSamples[-32];
- case 31: prediction += coefficients[30] * (drflac_int64)pDecodedSamples[-31];
- case 30: prediction += coefficients[29] * (drflac_int64)pDecodedSamples[-30];
- case 29: prediction += coefficients[28] * (drflac_int64)pDecodedSamples[-29];
- case 28: prediction += coefficients[27] * (drflac_int64)pDecodedSamples[-28];
- case 27: prediction += coefficients[26] * (drflac_int64)pDecodedSamples[-27];
- case 26: prediction += coefficients[25] * (drflac_int64)pDecodedSamples[-26];
- case 25: prediction += coefficients[24] * (drflac_int64)pDecodedSamples[-25];
- case 24: prediction += coefficients[23] * (drflac_int64)pDecodedSamples[-24];
- case 23: prediction += coefficients[22] * (drflac_int64)pDecodedSamples[-23];
- case 22: prediction += coefficients[21] * (drflac_int64)pDecodedSamples[-22];
- case 21: prediction += coefficients[20] * (drflac_int64)pDecodedSamples[-21];
- case 20: prediction += coefficients[19] * (drflac_int64)pDecodedSamples[-20];
- case 19: prediction += coefficients[18] * (drflac_int64)pDecodedSamples[-19];
- case 18: prediction += coefficients[17] * (drflac_int64)pDecodedSamples[-18];
- case 17: prediction += coefficients[16] * (drflac_int64)pDecodedSamples[-17];
- case 16: prediction += coefficients[15] * (drflac_int64)pDecodedSamples[-16];
- case 15: prediction += coefficients[14] * (drflac_int64)pDecodedSamples[-15];
- case 14: prediction += coefficients[13] * (drflac_int64)pDecodedSamples[-14];
- case 13: prediction += coefficients[12] * (drflac_int64)pDecodedSamples[-13];
- case 12: prediction += coefficients[11] * (drflac_int64)pDecodedSamples[-12];
- case 11: prediction += coefficients[10] * (drflac_int64)pDecodedSamples[-11];
- case 10: prediction += coefficients[ 9] * (drflac_int64)pDecodedSamples[-10];
- case 9: prediction += coefficients[ 8] * (drflac_int64)pDecodedSamples[- 9];
- case 8: prediction += coefficients[ 7] * (drflac_int64)pDecodedSamples[- 8];
- case 7: prediction += coefficients[ 6] * (drflac_int64)pDecodedSamples[- 7];
- case 6: prediction += coefficients[ 5] * (drflac_int64)pDecodedSamples[- 6];
- case 5: prediction += coefficients[ 4] * (drflac_int64)pDecodedSamples[- 5];
- case 4: prediction += coefficients[ 3] * (drflac_int64)pDecodedSamples[- 4];
- case 3: prediction += coefficients[ 2] * (drflac_int64)pDecodedSamples[- 3];
- case 2: prediction += coefficients[ 1] * (drflac_int64)pDecodedSamples[- 2];
- case 1: prediction += coefficients[ 0] * (drflac_int64)pDecodedSamples[- 1];
- }
-#endif
-
- return (drflac_int32)(prediction >> shift);
-}
-
-static DRFLAC_INLINE void drflac__calculate_prediction_64_x4(drflac_uint32 order, drflac_int32 shift, const drflac_int32* coefficients, const drflac_uint32 riceParamParts[4], drflac_int32* pDecodedSamples)
-{
- drflac_int64 prediction0 = 0;
- drflac_int64 prediction1 = 0;
- drflac_int64 prediction2 = 0;
- drflac_int64 prediction3 = 0;
-
- drflac_assert(order <= 32);
-
- switch (order)
- {
- case 32:
- prediction0 += coefficients[31] * (drflac_int64)pDecodedSamples[-32];
- prediction1 += coefficients[31] * (drflac_int64)pDecodedSamples[-31];
- prediction2 += coefficients[31] * (drflac_int64)pDecodedSamples[-30];
- prediction3 += coefficients[31] * (drflac_int64)pDecodedSamples[-29];
- case 31:
- prediction0 += coefficients[30] * (drflac_int64)pDecodedSamples[-31];
- prediction1 += coefficients[30] * (drflac_int64)pDecodedSamples[-30];
- prediction2 += coefficients[30] * (drflac_int64)pDecodedSamples[-29];
- prediction3 += coefficients[30] * (drflac_int64)pDecodedSamples[-28];
- case 30:
- prediction0 += coefficients[29] * (drflac_int64)pDecodedSamples[-30];
- prediction1 += coefficients[29] * (drflac_int64)pDecodedSamples[-29];
- prediction2 += coefficients[29] * (drflac_int64)pDecodedSamples[-28];
- prediction3 += coefficients[29] * (drflac_int64)pDecodedSamples[-27];
- case 29:
- prediction0 += coefficients[28] * (drflac_int64)pDecodedSamples[-29];
- prediction1 += coefficients[28] * (drflac_int64)pDecodedSamples[-28];
- prediction2 += coefficients[28] * (drflac_int64)pDecodedSamples[-27];
- prediction3 += coefficients[28] * (drflac_int64)pDecodedSamples[-26];
- case 28:
- prediction0 += coefficients[27] * (drflac_int64)pDecodedSamples[-28];
- prediction1 += coefficients[27] * (drflac_int64)pDecodedSamples[-27];
- prediction2 += coefficients[27] * (drflac_int64)pDecodedSamples[-26];
- prediction3 += coefficients[27] * (drflac_int64)pDecodedSamples[-25];
- case 27:
- prediction0 += coefficients[26] * (drflac_int64)pDecodedSamples[-27];
- prediction1 += coefficients[26] * (drflac_int64)pDecodedSamples[-26];
- prediction2 += coefficients[26] * (drflac_int64)pDecodedSamples[-25];
- prediction3 += coefficients[26] * (drflac_int64)pDecodedSamples[-24];
- case 26:
- prediction0 += coefficients[25] * (drflac_int64)pDecodedSamples[-26];
- prediction1 += coefficients[25] * (drflac_int64)pDecodedSamples[-25];
- prediction2 += coefficients[25] * (drflac_int64)pDecodedSamples[-24];
- prediction3 += coefficients[25] * (drflac_int64)pDecodedSamples[-23];
- case 25:
- prediction0 += coefficients[24] * (drflac_int64)pDecodedSamples[-25];
- prediction1 += coefficients[24] * (drflac_int64)pDecodedSamples[-24];
- prediction2 += coefficients[24] * (drflac_int64)pDecodedSamples[-23];
- prediction3 += coefficients[24] * (drflac_int64)pDecodedSamples[-22];
- case 24:
- prediction0 += coefficients[23] * (drflac_int64)pDecodedSamples[-24];
- prediction1 += coefficients[23] * (drflac_int64)pDecodedSamples[-23];
- prediction2 += coefficients[23] * (drflac_int64)pDecodedSamples[-22];
- prediction3 += coefficients[23] * (drflac_int64)pDecodedSamples[-21];
- case 23:
- prediction0 += coefficients[22] * (drflac_int64)pDecodedSamples[-23];
- prediction1 += coefficients[22] * (drflac_int64)pDecodedSamples[-22];
- prediction2 += coefficients[22] * (drflac_int64)pDecodedSamples[-21];
- prediction3 += coefficients[22] * (drflac_int64)pDecodedSamples[-20];
- case 22:
- prediction0 += coefficients[21] * (drflac_int64)pDecodedSamples[-22];
- prediction1 += coefficients[21] * (drflac_int64)pDecodedSamples[-21];
- prediction2 += coefficients[21] * (drflac_int64)pDecodedSamples[-20];
- prediction3 += coefficients[21] * (drflac_int64)pDecodedSamples[-19];
- case 21:
- prediction0 += coefficients[20] * (drflac_int64)pDecodedSamples[-21];
- prediction1 += coefficients[20] * (drflac_int64)pDecodedSamples[-20];
- prediction2 += coefficients[20] * (drflac_int64)pDecodedSamples[-19];
- prediction3 += coefficients[20] * (drflac_int64)pDecodedSamples[-18];
- case 20:
- prediction0 += coefficients[19] * (drflac_int64)pDecodedSamples[-20];
- prediction1 += coefficients[19] * (drflac_int64)pDecodedSamples[-19];
- prediction2 += coefficients[19] * (drflac_int64)pDecodedSamples[-18];
- prediction3 += coefficients[19] * (drflac_int64)pDecodedSamples[-17];
- case 19:
- prediction0 += coefficients[18] * (drflac_int64)pDecodedSamples[-19];
- prediction1 += coefficients[18] * (drflac_int64)pDecodedSamples[-18];
- prediction2 += coefficients[18] * (drflac_int64)pDecodedSamples[-17];
- prediction3 += coefficients[18] * (drflac_int64)pDecodedSamples[-16];
- case 18:
- prediction0 += coefficients[17] * (drflac_int64)pDecodedSamples[-18];
- prediction1 += coefficients[17] * (drflac_int64)pDecodedSamples[-17];
- prediction2 += coefficients[17] * (drflac_int64)pDecodedSamples[-16];
- prediction3 += coefficients[17] * (drflac_int64)pDecodedSamples[-15];
- case 17:
- prediction0 += coefficients[16] * (drflac_int64)pDecodedSamples[-17];
- prediction1 += coefficients[16] * (drflac_int64)pDecodedSamples[-16];
- prediction2 += coefficients[16] * (drflac_int64)pDecodedSamples[-15];
- prediction3 += coefficients[16] * (drflac_int64)pDecodedSamples[-14];
-
- case 16:
- prediction0 += coefficients[15] * (drflac_int64)pDecodedSamples[-16];
- prediction1 += coefficients[15] * (drflac_int64)pDecodedSamples[-15];
- prediction2 += coefficients[15] * (drflac_int64)pDecodedSamples[-14];
- prediction3 += coefficients[15] * (drflac_int64)pDecodedSamples[-13];
- case 15:
- prediction0 += coefficients[14] * (drflac_int64)pDecodedSamples[-15];
- prediction1 += coefficients[14] * (drflac_int64)pDecodedSamples[-14];
- prediction2 += coefficients[14] * (drflac_int64)pDecodedSamples[-13];
- prediction3 += coefficients[14] * (drflac_int64)pDecodedSamples[-12];
- case 14:
- prediction0 += coefficients[13] * (drflac_int64)pDecodedSamples[-14];
- prediction1 += coefficients[13] * (drflac_int64)pDecodedSamples[-13];
- prediction2 += coefficients[13] * (drflac_int64)pDecodedSamples[-12];
- prediction3 += coefficients[13] * (drflac_int64)pDecodedSamples[-11];
- case 13:
- prediction0 += coefficients[12] * (drflac_int64)pDecodedSamples[-13];
- prediction1 += coefficients[12] * (drflac_int64)pDecodedSamples[-12];
- prediction2 += coefficients[12] * (drflac_int64)pDecodedSamples[-11];
- prediction3 += coefficients[12] * (drflac_int64)pDecodedSamples[-10];
- case 12:
- prediction0 += coefficients[11] * (drflac_int64)pDecodedSamples[-12];
- prediction1 += coefficients[11] * (drflac_int64)pDecodedSamples[-11];
- prediction2 += coefficients[11] * (drflac_int64)pDecodedSamples[-10];
- prediction3 += coefficients[11] * (drflac_int64)pDecodedSamples[- 9];
- case 11:
- prediction0 += coefficients[10] * (drflac_int64)pDecodedSamples[-11];
- prediction1 += coefficients[10] * (drflac_int64)pDecodedSamples[-10];
- prediction2 += coefficients[10] * (drflac_int64)pDecodedSamples[- 9];
- prediction3 += coefficients[10] * (drflac_int64)pDecodedSamples[- 8];
- case 10:
- prediction0 += coefficients[9] * (drflac_int64)pDecodedSamples[-10];
- prediction1 += coefficients[9] * (drflac_int64)pDecodedSamples[- 9];
- prediction2 += coefficients[9] * (drflac_int64)pDecodedSamples[- 8];
- prediction3 += coefficients[9] * (drflac_int64)pDecodedSamples[- 7];
- case 9:
- prediction0 += coefficients[8] * (drflac_int64)pDecodedSamples[- 9];
- prediction1 += coefficients[8] * (drflac_int64)pDecodedSamples[- 8];
- prediction2 += coefficients[8] * (drflac_int64)pDecodedSamples[- 7];
- prediction3 += coefficients[8] * (drflac_int64)pDecodedSamples[- 6];
- case 8:
- prediction0 += coefficients[7] * (drflac_int64)pDecodedSamples[- 8];
- prediction1 += coefficients[7] * (drflac_int64)pDecodedSamples[- 7];
- prediction2 += coefficients[7] * (drflac_int64)pDecodedSamples[- 6];
- prediction3 += coefficients[7] * (drflac_int64)pDecodedSamples[- 5];
- case 7:
- prediction0 += coefficients[6] * (drflac_int64)pDecodedSamples[- 7];
- prediction1 += coefficients[6] * (drflac_int64)pDecodedSamples[- 6];
- prediction2 += coefficients[6] * (drflac_int64)pDecodedSamples[- 5];
- prediction3 += coefficients[6] * (drflac_int64)pDecodedSamples[- 4];
- case 6:
- prediction0 += coefficients[5] * (drflac_int64)pDecodedSamples[- 6];
- prediction1 += coefficients[5] * (drflac_int64)pDecodedSamples[- 5];
- prediction2 += coefficients[5] * (drflac_int64)pDecodedSamples[- 4];
- prediction3 += coefficients[5] * (drflac_int64)pDecodedSamples[- 3];
- case 5:
- prediction0 += coefficients[4] * (drflac_int64)pDecodedSamples[- 5];
- prediction1 += coefficients[4] * (drflac_int64)pDecodedSamples[- 4];
- prediction2 += coefficients[4] * (drflac_int64)pDecodedSamples[- 3];
- prediction3 += coefficients[4] * (drflac_int64)pDecodedSamples[- 2];
- case 4:
- prediction0 += coefficients[3] * (drflac_int64)pDecodedSamples[- 4];
- prediction1 += coefficients[3] * (drflac_int64)pDecodedSamples[- 3];
- prediction2 += coefficients[3] * (drflac_int64)pDecodedSamples[- 2];
- prediction3 += coefficients[3] * (drflac_int64)pDecodedSamples[- 1];
- order = 3;
- }
-
- switch (order)
- {
- case 3: prediction0 += coefficients[ 2] * (drflac_int64)pDecodedSamples[- 3];
- case 2: prediction0 += coefficients[ 1] * (drflac_int64)pDecodedSamples[- 2];
- case 1: prediction0 += coefficients[ 0] * (drflac_int64)pDecodedSamples[- 1];
- }
- pDecodedSamples[0] = riceParamParts[0] + (drflac_int32)(prediction0 >> shift);
-
- switch (order)
- {
- case 3: prediction1 += coefficients[ 2] * (drflac_int64)pDecodedSamples[- 2];
- case 2: prediction1 += coefficients[ 1] * (drflac_int64)pDecodedSamples[- 1];
- case 1: prediction1 += coefficients[ 0] * (drflac_int64)pDecodedSamples[ 0];
- }
- pDecodedSamples[1] = riceParamParts[1] + (drflac_int32)(prediction1 >> shift);
-
- switch (order)
- {
- case 3: prediction2 += coefficients[ 2] * (drflac_int64)pDecodedSamples[- 1];
- case 2: prediction2 += coefficients[ 1] * (drflac_int64)pDecodedSamples[ 0];
- case 1: prediction2 += coefficients[ 0] * (drflac_int64)pDecodedSamples[ 1];
- }
- pDecodedSamples[2] = riceParamParts[2] + (drflac_int32)(prediction2 >> shift);
-
- switch (order)
- {
- case 3: prediction3 += coefficients[ 2] * (drflac_int64)pDecodedSamples[ 0];
- case 2: prediction3 += coefficients[ 1] * (drflac_int64)pDecodedSamples[ 1];
- case 1: prediction3 += coefficients[ 0] * (drflac_int64)pDecodedSamples[ 2];
- }
- pDecodedSamples[3] = riceParamParts[3] + (drflac_int32)(prediction3 >> shift);
-}
-
-#if defined(DRFLAC_SUPPORT_SSE41)
-static DRFLAC_INLINE drflac_int32 drflac__calculate_prediction_64__sse41(drflac_uint32 order, drflac_int32 shift, const drflac_int32* coefficients, drflac_int32* pDecodedSamples)
-{
- __m128i prediction = _mm_setzero_si128();
-
- drflac_assert(order <= 32);
-
- switch (order)
- {
- case 32:
- case 31: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[31], 0, coefficients[30]), _mm_set_epi32(0, pDecodedSamples[-32], 0, pDecodedSamples[-31])));
- case 30:
- case 29: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[29], 0, coefficients[28]), _mm_set_epi32(0, pDecodedSamples[-30], 0, pDecodedSamples[-29])));
- case 28:
- case 27: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[27], 0, coefficients[26]), _mm_set_epi32(0, pDecodedSamples[-28], 0, pDecodedSamples[-27])));
- case 26:
- case 25: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[25], 0, coefficients[24]), _mm_set_epi32(0, pDecodedSamples[-26], 0, pDecodedSamples[-25])));
- case 24:
- case 23: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[23], 0, coefficients[22]), _mm_set_epi32(0, pDecodedSamples[-24], 0, pDecodedSamples[-23])));
- case 22:
- case 21: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[21], 0, coefficients[20]), _mm_set_epi32(0, pDecodedSamples[-22], 0, pDecodedSamples[-21])));
- case 20:
- case 19: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[19], 0, coefficients[18]), _mm_set_epi32(0, pDecodedSamples[-20], 0, pDecodedSamples[-19])));
- case 18:
- case 17: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[17], 0, coefficients[16]), _mm_set_epi32(0, pDecodedSamples[-18], 0, pDecodedSamples[-17])));
- case 16:
- case 15: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[15], 0, coefficients[14]), _mm_set_epi32(0, pDecodedSamples[-16], 0, pDecodedSamples[-15])));
- case 14:
- case 13: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[13], 0, coefficients[12]), _mm_set_epi32(0, pDecodedSamples[-14], 0, pDecodedSamples[-13])));
- case 12:
- case 11: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[11], 0, coefficients[10]), _mm_set_epi32(0, pDecodedSamples[-12], 0, pDecodedSamples[-11])));
- case 10:
- case 9: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[ 9], 0, coefficients[ 8]), _mm_set_epi32(0, pDecodedSamples[-10], 0, pDecodedSamples[- 9])));
- case 8:
- case 7: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[ 7], 0, coefficients[ 6]), _mm_set_epi32(0, pDecodedSamples[- 8], 0, pDecodedSamples[- 7])));
- case 6:
- case 5: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[ 5], 0, coefficients[ 4]), _mm_set_epi32(0, pDecodedSamples[- 6], 0, pDecodedSamples[- 5])));
- case 4:
- case 3: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[ 3], 0, coefficients[ 2]), _mm_set_epi32(0, pDecodedSamples[- 4], 0, pDecodedSamples[- 3])));
- case 2:
- case 1: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[ 1], 0, coefficients[ 0]), _mm_set_epi32(0, pDecodedSamples[- 2], 0, pDecodedSamples[- 1])));
- }
-
- return (drflac_int32)((
- ((drflac_uint64*)&prediction)[0] +
- ((drflac_uint64*)&prediction)[1]) >> shift);
-}
-
-static DRFLAC_INLINE void drflac__calculate_prediction_64_x2__sse41(drflac_uint32 order, drflac_int32 shift, const drflac_int32* coefficients, const drflac_uint32 riceParamParts[4], drflac_int32* pDecodedSamples)
-{
- __m128i prediction = _mm_setzero_si128();
- drflac_int64 predictions[2] = {0, 0};
-
- drflac_assert(order <= 32);
-
- switch (order)
- {
- case 32: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[31], 0, coefficients[31]), _mm_set_epi32(0, pDecodedSamples[-31], 0, pDecodedSamples[-32])));
- case 31: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[30], 0, coefficients[30]), _mm_set_epi32(0, pDecodedSamples[-30], 0, pDecodedSamples[-31])));
- case 30: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[29], 0, coefficients[29]), _mm_set_epi32(0, pDecodedSamples[-29], 0, pDecodedSamples[-30])));
- case 29: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[28], 0, coefficients[28]), _mm_set_epi32(0, pDecodedSamples[-28], 0, pDecodedSamples[-29])));
- case 28: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[27], 0, coefficients[27]), _mm_set_epi32(0, pDecodedSamples[-27], 0, pDecodedSamples[-28])));
- case 27: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[26], 0, coefficients[26]), _mm_set_epi32(0, pDecodedSamples[-26], 0, pDecodedSamples[-27])));
- case 26: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[25], 0, coefficients[25]), _mm_set_epi32(0, pDecodedSamples[-25], 0, pDecodedSamples[-26])));
- case 25: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[24], 0, coefficients[24]), _mm_set_epi32(0, pDecodedSamples[-24], 0, pDecodedSamples[-25])));
- case 24: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[23], 0, coefficients[23]), _mm_set_epi32(0, pDecodedSamples[-23], 0, pDecodedSamples[-24])));
- case 23: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[22], 0, coefficients[22]), _mm_set_epi32(0, pDecodedSamples[-22], 0, pDecodedSamples[-23])));
- case 22: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[21], 0, coefficients[21]), _mm_set_epi32(0, pDecodedSamples[-21], 0, pDecodedSamples[-22])));
- case 21: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[20], 0, coefficients[20]), _mm_set_epi32(0, pDecodedSamples[-20], 0, pDecodedSamples[-21])));
- case 20: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[19], 0, coefficients[19]), _mm_set_epi32(0, pDecodedSamples[-19], 0, pDecodedSamples[-20])));
- case 19: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[18], 0, coefficients[18]), _mm_set_epi32(0, pDecodedSamples[-18], 0, pDecodedSamples[-19])));
- case 18: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[17], 0, coefficients[17]), _mm_set_epi32(0, pDecodedSamples[-17], 0, pDecodedSamples[-18])));
- case 17: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[16], 0, coefficients[16]), _mm_set_epi32(0, pDecodedSamples[-16], 0, pDecodedSamples[-17])));
- case 16: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[15], 0, coefficients[15]), _mm_set_epi32(0, pDecodedSamples[-15], 0, pDecodedSamples[-16])));
- case 15: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[14], 0, coefficients[14]), _mm_set_epi32(0, pDecodedSamples[-14], 0, pDecodedSamples[-15])));
- case 14: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[13], 0, coefficients[13]), _mm_set_epi32(0, pDecodedSamples[-13], 0, pDecodedSamples[-14])));
- case 13: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[12], 0, coefficients[12]), _mm_set_epi32(0, pDecodedSamples[-12], 0, pDecodedSamples[-13])));
- case 12: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[11], 0, coefficients[11]), _mm_set_epi32(0, pDecodedSamples[-11], 0, pDecodedSamples[-12])));
- case 11: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[10], 0, coefficients[10]), _mm_set_epi32(0, pDecodedSamples[-10], 0, pDecodedSamples[-11])));
- case 10: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[ 9], 0, coefficients[ 9]), _mm_set_epi32(0, pDecodedSamples[- 9], 0, pDecodedSamples[-10])));
- case 9: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[ 8], 0, coefficients[ 8]), _mm_set_epi32(0, pDecodedSamples[- 8], 0, pDecodedSamples[- 9])));
- case 8: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[ 7], 0, coefficients[ 7]), _mm_set_epi32(0, pDecodedSamples[- 7], 0, pDecodedSamples[- 8])));
- case 7: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[ 6], 0, coefficients[ 6]), _mm_set_epi32(0, pDecodedSamples[- 6], 0, pDecodedSamples[- 7])));
- case 6: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[ 5], 0, coefficients[ 5]), _mm_set_epi32(0, pDecodedSamples[- 5], 0, pDecodedSamples[- 6])));
- case 5: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[ 4], 0, coefficients[ 4]), _mm_set_epi32(0, pDecodedSamples[- 4], 0, pDecodedSamples[- 5])));
- case 4: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[ 3], 0, coefficients[ 3]), _mm_set_epi32(0, pDecodedSamples[- 3], 0, pDecodedSamples[- 4])));
- case 3: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[ 2], 0, coefficients[ 2]), _mm_set_epi32(0, pDecodedSamples[- 2], 0, pDecodedSamples[- 3])));
- case 2: prediction = _mm_add_epi64(prediction, _mm_mul_epi32(_mm_set_epi32(0, coefficients[ 1], 0, coefficients[ 1]), _mm_set_epi32(0, pDecodedSamples[- 1], 0, pDecodedSamples[- 2])));
- order = 1;
- }
-
- _mm_storeu_si128((__m128i*)predictions, prediction);
-
- switch (order)
- {
- case 1: predictions[0] += coefficients[ 0] * (drflac_int64)pDecodedSamples[- 1];
- }
- pDecodedSamples[0] = riceParamParts[0] + (drflac_int32)(predictions[0] >> shift);
-
- switch (order)
- {
- case 1: predictions[1] += coefficients[ 0] * (drflac_int64)pDecodedSamples[ 0];
- }
- pDecodedSamples[1] = riceParamParts[1] + (drflac_int32)(predictions[1] >> shift);
-}
-
-
-static DRFLAC_INLINE __m128i drflac__mm_not_si128(__m128i a)
-{
- return _mm_xor_si128(a, _mm_cmpeq_epi32(_mm_setzero_si128(), _mm_setzero_si128()));
-}
-
-static DRFLAC_INLINE __m128i drflac__mm_slide1_epi32(__m128i a, __m128i b)
-{
- /* a3a2a1a0/b3b2b1b0 -> a2a1a0b3 */
-
- /* Result = a2a1a0b3 */
- __m128i b3a3b2a2 = _mm_unpackhi_epi32(a, b);
- __m128i a2b3a2b3 = _mm_shuffle_epi32(b3a3b2a2, _MM_SHUFFLE(0, 3, 0, 3));
- __m128i a1a2a0b3 = _mm_unpacklo_epi32(a2b3a2b3, a);
- __m128i a2a1a0b3 = _mm_shuffle_epi32(a1a2a0b3, _MM_SHUFFLE(2, 3, 1, 0));
- return a2a1a0b3;
-}
-
-static DRFLAC_INLINE __m128i drflac__mm_slide2_epi32(__m128i a, __m128i b)
-{
- /* Result = a1a0b3b2 */
- __m128i b1b0b3b2 = _mm_shuffle_epi32(b, _MM_SHUFFLE(1, 0, 3, 2));
- __m128i a1b3a0b2 = _mm_unpacklo_epi32(b1b0b3b2, a);
- __m128i a1a0b3b2 = _mm_shuffle_epi32(a1b3a0b2, _MM_SHUFFLE(3, 1, 2, 0));
- return a1a0b3b2;
-}
-
-static DRFLAC_INLINE __m128i drflac__mm_slide3_epi32(__m128i a, __m128i b)
-{
- /* Result = a0b3b2b1 */
- __m128i b1a1b0a0 = _mm_unpacklo_epi32(a, b);
- __m128i a0b1a0b1 = _mm_shuffle_epi32(b1a1b0a0, _MM_SHUFFLE(0, 3, 0, 3));
- __m128i b3a0b2b1 = _mm_unpackhi_epi32(a0b1a0b1, b);
- __m128i a0b3b2b1 = _mm_shuffle_epi32(b3a0b2b1, _MM_SHUFFLE(2, 3, 1, 0));
- return a0b3b2b1;
-}
-
-static DRFLAC_INLINE void drflac__calculate_prediction_32_x4__sse41(drflac_uint32 order, drflac_int32 shift, const __m128i* coefficients128, const __m128i riceParamParts128, drflac_int32* pDecodedSamples)
-{
- drflac_assert(order <= 32);
-
- /* I don't think this is as efficient as it could be. More work needs to be done on this. */
- if (order > 0) {
- drflac_int32 predictions[4];
- drflac_uint32 riceParamParts[4];
-
- __m128i s_09_10_11_12 = _mm_loadu_si128((const __m128i*)(pDecodedSamples - 12));
- __m128i s_05_06_07_08 = _mm_loadu_si128((const __m128i*)(pDecodedSamples - 8));
- __m128i s_01_02_03_04 = _mm_loadu_si128((const __m128i*)(pDecodedSamples - 4));
-
- __m128i prediction = _mm_setzero_si128();
-
- /*
- The idea with this switch is to do do a single jump based on the value of "order". In my test library, "order" is never larger than 12, so
- I have decided to do a less optimal, but simpler solution in the order > 12 case.
- */
- switch (order)
- {
- case 32: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[31], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 32))));
- case 31: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[30], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 31))));
- case 30: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[29], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 30))));
- case 29: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[28], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 29))));
- case 28: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[27], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 28))));
- case 27: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[26], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 27))));
- case 26: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[25], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 26))));
- case 25: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[24], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 25))));
- case 24: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[23], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 24))));
- case 23: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[22], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 23))));
- case 22: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[21], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 22))));
- case 21: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[20], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 21))));
- case 20: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[19], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 20))));
- case 19: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[18], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 19))));
- case 18: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[17], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 18))));
- case 17: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[16], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 17))));
- case 16: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[15], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 16))));
- case 15: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[14], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 15))));
- case 14: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[13], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 14))));
- case 13: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[12], _mm_loadu_si128((const __m128i*)(pDecodedSamples - 13))));
-
- case 12: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[11], s_09_10_11_12));
- case 11: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[10], drflac__mm_slide3_epi32(s_05_06_07_08, s_09_10_11_12)));
- case 10: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[ 9], drflac__mm_slide2_epi32(s_05_06_07_08, s_09_10_11_12)));
- case 9: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[ 8], drflac__mm_slide1_epi32(s_05_06_07_08, s_09_10_11_12)));
- case 8: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[ 7], s_05_06_07_08));
- case 7: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[ 6], drflac__mm_slide3_epi32(s_01_02_03_04, s_05_06_07_08)));
- case 6: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[ 5], drflac__mm_slide2_epi32(s_01_02_03_04, s_05_06_07_08)));
- case 5: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[ 4], drflac__mm_slide1_epi32(s_01_02_03_04, s_05_06_07_08)));
- case 4: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[ 3], s_01_02_03_04)); order = 3; /* <-- Don't forget to set order to 3 here! */
- case 3: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[ 2], drflac__mm_slide3_epi32(_mm_setzero_si128(), s_01_02_03_04)));
- case 2: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[ 1], drflac__mm_slide2_epi32(_mm_setzero_si128(), s_01_02_03_04)));
- case 1: prediction = _mm_add_epi32(prediction, _mm_mullo_epi32(coefficients128[ 0], drflac__mm_slide1_epi32(_mm_setzero_si128(), s_01_02_03_04)));
- }
-
- _mm_storeu_si128((__m128i*)predictions, prediction);
- _mm_storeu_si128((__m128i*)riceParamParts, riceParamParts128);
-
- predictions[0] = riceParamParts[0] + (predictions[0] >> shift);
-
- switch (order)
- {
- case 3: predictions[3] += ((const drflac_int32*)&coefficients128[ 2])[0] * predictions[ 0];
- case 2: predictions[2] += ((const drflac_int32*)&coefficients128[ 1])[0] * predictions[ 0];
- case 1: predictions[1] += ((const drflac_int32*)&coefficients128[ 0])[0] * predictions[ 0];
- }
- predictions[1] = riceParamParts[1] + (predictions[1] >> shift);
-
- switch (order)
- {
- case 3:
- case 2: predictions[3] += ((const drflac_int32*)&coefficients128[ 1])[0] * predictions[ 1];
- case 1: predictions[2] += ((const drflac_int32*)&coefficients128[ 0])[0] * predictions[ 1];
- }
- predictions[2] = riceParamParts[2] + (predictions[2] >> shift);
-
- switch (order)
- {
- case 3:
- case 2:
- case 1: predictions[3] += ((const drflac_int32*)&coefficients128[ 0])[0] * predictions[ 2];
- }
- predictions[3] = riceParamParts[3] + (predictions[3] >> shift);
-
- pDecodedSamples[0] = predictions[0];
- pDecodedSamples[1] = predictions[1];
- pDecodedSamples[2] = predictions[2];
- pDecodedSamples[3] = predictions[3];
- } else {
- _mm_storeu_si128((__m128i*)pDecodedSamples, riceParamParts128);
- }
-}
-#endif
-
-#if 0
-/*
-Reference implementation for reading and decoding samples with residual. This is intentionally left unoptimized for the
-sake of readability and should only be used as a reference.
-*/
-static drflac_bool32 drflac__decode_samples_with_residual__rice__reference(drflac_bs* bs, drflac_uint32 bitsPerSample, drflac_uint32 count, drflac_uint8 riceParam, drflac_uint32 order, drflac_int32 shift, const drflac_int32* coefficients, drflac_int32* pSamplesOut)
-{
- drflac_uint32 i;
-
- drflac_assert(bs != NULL);
- drflac_assert(count > 0);
- drflac_assert(pSamplesOut != NULL);
-
- for (i = 0; i < count; ++i) {
- drflac_uint32 zeroCounter = 0;
- for (;;) {
- drflac_uint8 bit;
- if (!drflac__read_uint8(bs, 1, &bit)) {
- return DRFLAC_FALSE;
- }
-
- if (bit == 0) {
- zeroCounter += 1;
- } else {
- break;
- }
- }
-
- drflac_uint32 decodedRice;
- if (riceParam > 0) {
- if (!drflac__read_uint32(bs, riceParam, &decodedRice)) {
- return DRFLAC_FALSE;
- }
- } else {
- decodedRice = 0;
- }
-
- decodedRice |= (zeroCounter << riceParam);
- if ((decodedRice & 0x01)) {
- decodedRice = ~(decodedRice >> 1);
- } else {
- decodedRice = (decodedRice >> 1);
- }
-
-
- if (bitsPerSample > 16) {
- pSamplesOut[i] = decodedRice + drflac__calculate_prediction_64(order, shift, coefficients, pSamplesOut + i);
- } else {
- pSamplesOut[i] = decodedRice + drflac__calculate_prediction_32(order, shift, coefficients, pSamplesOut + i);
- }
- }
-
- return DRFLAC_TRUE;
-}
-#endif
-
-#if 0
-static drflac_bool32 drflac__read_rice_parts__reference(drflac_bs* bs, drflac_uint8 riceParam, drflac_uint32* pZeroCounterOut, drflac_uint32* pRiceParamPartOut)
-{
- drflac_uint32 zeroCounter = 0;
- drflac_uint32 decodedRice;
-
- for (;;) {
- drflac_uint8 bit;
- if (!drflac__read_uint8(bs, 1, &bit)) {
- return DRFLAC_FALSE;
- }
-
- if (bit == 0) {
- zeroCounter += 1;
- } else {
- break;
- }
- }
-
- if (riceParam > 0) {
- if (!drflac__read_uint32(bs, riceParam, &decodedRice)) {
- return DRFLAC_FALSE;
- }
- } else {
- decodedRice = 0;
- }
-
- *pZeroCounterOut = zeroCounter;
- *pRiceParamPartOut = decodedRice;
- return DRFLAC_TRUE;
-}
-#endif
-
-#if 0
-static DRFLAC_INLINE drflac_bool32 drflac__read_rice_parts(drflac_bs* bs, drflac_uint8 riceParam, drflac_uint32* pZeroCounterOut, drflac_uint32* pRiceParamPartOut)
-{
- drflac_cache_t riceParamMask;
- drflac_uint32 zeroCounter;
- drflac_uint32 setBitOffsetPlus1;
- drflac_uint32 riceParamPart;
- drflac_uint32 riceLength;
-
- drflac_assert(riceParam > 0); /* <-- riceParam should never be 0. drflac__read_rice_parts__param_equals_zero() should be used instead for this case. */
-
- riceParamMask = DRFLAC_CACHE_L1_SELECTION_MASK(riceParam);
-
- zeroCounter = 0;
- while (bs->cache == 0) {
- zeroCounter += (drflac_uint32)DRFLAC_CACHE_L1_BITS_REMAINING(bs);
- if (!drflac__reload_cache(bs)) {
- return DRFLAC_FALSE;
- }
- }
-
- setBitOffsetPlus1 = drflac__clz(bs->cache);
- zeroCounter += setBitOffsetPlus1;
- setBitOffsetPlus1 += 1;
-
- riceLength = setBitOffsetPlus1 + riceParam;
- if (riceLength < DRFLAC_CACHE_L1_BITS_REMAINING(bs)) {
- riceParamPart = (drflac_uint32)((bs->cache & (riceParamMask >> setBitOffsetPlus1)) >> DRFLAC_CACHE_L1_SELECTION_SHIFT(bs, riceLength));
-
- bs->consumedBits += riceLength;
- bs->cache <<= riceLength;
- } else {
- drflac_uint32 bitCountLo;
- drflac_cache_t resultHi;
-
- bs->consumedBits += riceLength;
- bs->cache <<= setBitOffsetPlus1 & (DRFLAC_CACHE_L1_SIZE_BITS(bs)-1); /* <-- Equivalent to "if (setBitOffsetPlus1 < DRFLAC_CACHE_L1_SIZE_BITS(bs)) { bs->cache <<= setBitOffsetPlus1; }" */
-
- /* It straddles the cached data. It will never cover more than the next chunk. We just read the number in two parts and combine them. */
- bitCountLo = bs->consumedBits - DRFLAC_CACHE_L1_SIZE_BITS(bs);
- resultHi = DRFLAC_CACHE_L1_SELECT_AND_SHIFT(bs, riceParam); /* <-- Use DRFLAC_CACHE_L1_SELECT_AND_SHIFT_SAFE() if ever this function allows riceParam=0. */
-
- if (bs->nextL2Line < DRFLAC_CACHE_L2_LINE_COUNT(bs)) {
-#ifndef DR_FLAC_NO_CRC
- drflac__update_crc16(bs);
-#endif
- bs->cache = drflac__be2host__cache_line(bs->cacheL2[bs->nextL2Line++]);
- bs->consumedBits = 0;
-#ifndef DR_FLAC_NO_CRC
- bs->crc16Cache = bs->cache;
-#endif
- } else {
- /* Slow path. We need to fetch more data from the client. */
- if (!drflac__reload_cache(bs)) {
- return DRFLAC_FALSE;
- }
- }
-
- riceParamPart = (drflac_uint32)(resultHi | DRFLAC_CACHE_L1_SELECT_AND_SHIFT_SAFE(bs, bitCountLo));
-
- bs->consumedBits += bitCountLo;
- bs->cache <<= bitCountLo;
- }
-
- pZeroCounterOut[0] = zeroCounter;
- pRiceParamPartOut[0] = riceParamPart;
-
- return DRFLAC_TRUE;
-}
-#endif
-
-static DRFLAC_INLINE drflac_bool32 drflac__read_rice_parts_x1(drflac_bs* bs, drflac_uint8 riceParam, drflac_uint32* pZeroCounterOut, drflac_uint32* pRiceParamPartOut)
-{
- drflac_uint32 riceParamPlus1 = riceParam + 1;
- /*drflac_cache_t riceParamPlus1Mask = DRFLAC_CACHE_L1_SELECTION_MASK(riceParamPlus1);*/
- drflac_uint32 riceParamPlus1Shift = DRFLAC_CACHE_L1_SELECTION_SHIFT(bs, riceParamPlus1);
- drflac_uint32 riceParamPlus1MaxConsumedBits = DRFLAC_CACHE_L1_SIZE_BITS(bs) - riceParamPlus1;
-
- /*
- The idea here is to use local variables for the cache in an attempt to encourage the compiler to store them in registers. I have
- no idea how this will work in practice...
- */
- drflac_cache_t bs_cache = bs->cache;
- drflac_uint32 bs_consumedBits = bs->consumedBits;
-
- /* The first thing to do is find the first unset bit. Most likely a bit will be set in the current cache line. */
- drflac_uint32 lzcount = drflac__clz(bs_cache);
- if (lzcount < sizeof(bs_cache)*8) {
- pZeroCounterOut[0] = lzcount;
-
- /*
- It is most likely that the riceParam part (which comes after the zero counter) is also on this cache line. When extracting
- this, we include the set bit from the unary coded part because it simplifies cache management. This bit will be handled
- outside of this function at a higher level.
- */
- extract_rice_param_part:
- bs_cache <<= lzcount;
- bs_consumedBits += lzcount;
-
- if (bs_consumedBits <= riceParamPlus1MaxConsumedBits) {
- /* Getting here means the rice parameter part is wholly contained within the current cache line. */
- pRiceParamPartOut[0] = (drflac_uint32)(bs_cache >> riceParamPlus1Shift);
- bs_cache <<= riceParamPlus1;
- bs_consumedBits += riceParamPlus1;
- } else {
- drflac_uint32 riceParamPartHi;
- drflac_uint32 riceParamPartLo;
- drflac_uint32 riceParamPartLoBitCount;
-
- /*
- Getting here means the rice parameter part straddles the cache line. We need to read from the tail of the current cache
- line, reload the cache, and then combine it with the head of the next cache line.
- */
-
- /* Grab the high part of the rice parameter part. */
- riceParamPartHi = (drflac_uint32)(bs_cache >> riceParamPlus1Shift);
-
- /* Before reloading the cache we need to grab the size in bits of the low part. */
- riceParamPartLoBitCount = bs_consumedBits - riceParamPlus1MaxConsumedBits;
- drflac_assert(riceParamPartLoBitCount > 0 && riceParamPartLoBitCount < 32);
-
- /* Now reload the cache. */
- if (bs->nextL2Line < DRFLAC_CACHE_L2_LINE_COUNT(bs)) {
- #ifndef DR_FLAC_NO_CRC
- drflac__update_crc16(bs);
- #endif
- bs_cache = drflac__be2host__cache_line(bs->cacheL2[bs->nextL2Line++]);
- bs_consumedBits = riceParamPartLoBitCount;
- #ifndef DR_FLAC_NO_CRC
- bs->crc16Cache = bs_cache;
- #endif
- } else {
- /* Slow path. We need to fetch more data from the client. */
- if (!drflac__reload_cache(bs)) {
- return DRFLAC_FALSE;
- }
-
- bs_cache = bs->cache;
- bs_consumedBits = bs->consumedBits + riceParamPartLoBitCount;
- }
-
- /* We should now have enough information to construct the rice parameter part. */
- riceParamPartLo = (drflac_uint32)(bs_cache >> (DRFLAC_CACHE_L1_SELECTION_SHIFT(bs, riceParamPartLoBitCount)));
- pRiceParamPartOut[0] = riceParamPartHi | riceParamPartLo;
-
- bs_cache <<= riceParamPartLoBitCount;
- }
- } else {
- /*
- Getting here means there are no bits set on the cache line. This is a less optimal case because we just wasted a call
- to drflac__clz() and we need to reload the cache.
- */
- drflac_uint32 zeroCounter = (drflac_uint32)(DRFLAC_CACHE_L1_SIZE_BITS(bs) - bs_consumedBits);
- for (;;) {
- if (bs->nextL2Line < DRFLAC_CACHE_L2_LINE_COUNT(bs)) {
- #ifndef DR_FLAC_NO_CRC
- drflac__update_crc16(bs);
- #endif
- bs_cache = drflac__be2host__cache_line(bs->cacheL2[bs->nextL2Line++]);
- bs_consumedBits = 0;
- #ifndef DR_FLAC_NO_CRC
- bs->crc16Cache = bs_cache;
- #endif
- } else {
- /* Slow path. We need to fetch more data from the client. */
- if (!drflac__reload_cache(bs)) {
- return DRFLAC_FALSE;
- }
-
- bs_cache = bs->cache;
- bs_consumedBits = bs->consumedBits;
- }
-
- lzcount = drflac__clz(bs_cache);
- zeroCounter += lzcount;
-
- if (lzcount < sizeof(bs_cache)*8) {
- break;
- }
- }
-
- pZeroCounterOut[0] = zeroCounter;
- goto extract_rice_param_part;
- }
-
- /* Make sure the cache is restored at the end of it all. */
- bs->cache = bs_cache;
- bs->consumedBits = bs_consumedBits;
-
- return DRFLAC_TRUE;
-}
-
-static DRFLAC_INLINE drflac_bool32 drflac__read_rice_parts_x4(drflac_bs* bs, drflac_uint8 riceParam, drflac_uint32* pZeroCounterOut, drflac_uint32* pRiceParamPartOut)
-{
- drflac_uint32 riceParamPlus1 = riceParam + 1;
- /*drflac_cache_t riceParamPlus1Mask = DRFLAC_CACHE_L1_SELECTION_MASK(riceParamPlus1);*/
- drflac_uint32 riceParamPlus1Shift = DRFLAC_CACHE_L1_SELECTION_SHIFT(bs, riceParamPlus1);
- drflac_uint32 riceParamPlus1MaxConsumedBits = DRFLAC_CACHE_L1_SIZE_BITS(bs) - riceParamPlus1;
-
- /*
- The idea here is to use local variables for the cache in an attempt to encourage the compiler to store them in registers. I have
- no idea how this will work in practice...
- */
- drflac_cache_t bs_cache = bs->cache;
- drflac_uint32 bs_consumedBits = bs->consumedBits;
-
- /*
- What this is doing is trying to efficiently extract 4 rice parts at a time, the idea being that we can exploit certain properties
- to our advantage to make things more efficient.
- */
- int i;
- for (i = 0; i < 4; ++i) {
- /* The first thing to do is find the first unset bit. Most likely a bit will be set in the current cache line. */
- drflac_uint32 lzcount = drflac__clz(bs_cache);
- if (lzcount < sizeof(bs_cache)*8) {
- pZeroCounterOut[i] = lzcount;
-
- /*
- It is most likely that the riceParam part (which comes after the zero counter) is also on this cache line. When extracting
- this, we include the set bit from the unary coded part because it simplifies cache management. This bit will be handled
- outside of this function at a higher level.
- */
- extract_rice_param_part:
- bs_cache <<= lzcount;
- bs_consumedBits += lzcount;
-
- if (bs_consumedBits <= riceParamPlus1MaxConsumedBits) {
- /* Getting here means the rice parameter part is wholly contained within the current cache line. */
- pRiceParamPartOut[i] = (drflac_uint32)(bs_cache >> riceParamPlus1Shift);
- bs_cache <<= riceParamPlus1;
- bs_consumedBits += riceParamPlus1;
- } else {
- drflac_uint32 riceParamPartHi;
- drflac_uint32 riceParamPartLo;
- drflac_uint32 riceParamPartLoBitCount;
-
- /*
- Getting here means the rice parameter part straddles the cache line. We need to read from the tail of the current cache
- line, reload the cache, and then combine it with the head of the next cache line.
- */
-
- /* Grab the high part of the rice parameter part. */
- riceParamPartHi = (drflac_uint32)(bs_cache >> riceParamPlus1Shift);
-
- /* Before reloading the cache we need to grab the size in bits of the low part. */
- riceParamPartLoBitCount = bs_consumedBits - riceParamPlus1MaxConsumedBits;
-
- /* Now reload the cache. */
- if (bs->nextL2Line < DRFLAC_CACHE_L2_LINE_COUNT(bs)) {
- #ifndef DR_FLAC_NO_CRC
- drflac__update_crc16(bs);
- #endif
- bs_cache = drflac__be2host__cache_line(bs->cacheL2[bs->nextL2Line++]);
- bs_consumedBits = riceParamPartLoBitCount;
- #ifndef DR_FLAC_NO_CRC
- bs->crc16Cache = bs_cache;
- #endif
- } else {
- /* Slow path. We need to fetch more data from the client. */
- if (!drflac__reload_cache(bs)) {
- return DRFLAC_FALSE;
- }
-
- bs_cache = bs->cache;
- bs_consumedBits = bs->consumedBits + riceParamPartLoBitCount;
- }
-
- /* We should now have enough information to construct the rice parameter part. */
- riceParamPartLo = (drflac_uint32)(bs_cache >> (DRFLAC_CACHE_L1_SELECTION_SHIFT(bs, riceParamPartLoBitCount)));
- pRiceParamPartOut[i] = riceParamPartHi | riceParamPartLo;
-
- bs_cache <<= riceParamPartLoBitCount;
- }
- } else {
- /*
- Getting here means there are no bits set on the cache line. This is a less optimal case because we just wasted a call
- to drflac__clz() and we need to reload the cache.
- */
- drflac_uint32 zeroCounter = (drflac_uint32)(DRFLAC_CACHE_L1_SIZE_BITS(bs) - bs_consumedBits);
- for (;;) {
- if (bs->nextL2Line < DRFLAC_CACHE_L2_LINE_COUNT(bs)) {
- #ifndef DR_FLAC_NO_CRC
- drflac__update_crc16(bs);
- #endif
- bs_cache = drflac__be2host__cache_line(bs->cacheL2[bs->nextL2Line++]);
- bs_consumedBits = 0;
- #ifndef DR_FLAC_NO_CRC
- bs->crc16Cache = bs_cache;
- #endif
- } else {
- /* Slow path. We need to fetch more data from the client. */
- if (!drflac__reload_cache(bs)) {
- return DRFLAC_FALSE;
- }
-
- bs_cache = bs->cache;
- bs_consumedBits = bs->consumedBits;
- }
-
- lzcount = drflac__clz(bs_cache);
- zeroCounter += lzcount;
-
- if (lzcount < sizeof(bs_cache)*8) {
- break;
- }
- }
-
- pZeroCounterOut[i] = zeroCounter;
- goto extract_rice_param_part;
- }
- }
-
- /* Make sure the cache is restored at the end of it all. */
- bs->cache = bs_cache;
- bs->consumedBits = bs_consumedBits;
-
- return DRFLAC_TRUE;
-}
-
-static DRFLAC_INLINE drflac_bool32 drflac__seek_rice_parts(drflac_bs* bs, drflac_uint8 riceParam)
-{
- drflac_uint32 riceParamPlus1 = riceParam + 1;
- drflac_uint32 riceParamPlus1MaxConsumedBits = DRFLAC_CACHE_L1_SIZE_BITS(bs) - riceParamPlus1;
-
- /*
- The idea here is to use local variables for the cache in an attempt to encourage the compiler to store them in registers. I have
- no idea how this will work in practice...
- */
- drflac_cache_t bs_cache = bs->cache;
- drflac_uint32 bs_consumedBits = bs->consumedBits;
-
- /* The first thing to do is find the first unset bit. Most likely a bit will be set in the current cache line. */
- drflac_uint32 lzcount = drflac__clz(bs_cache);
- if (lzcount < sizeof(bs_cache)*8) {
- /*
- It is most likely that the riceParam part (which comes after the zero counter) is also on this cache line. When extracting
- this, we include the set bit from the unary coded part because it simplifies cache management. This bit will be handled
- outside of this function at a higher level.
- */
- extract_rice_param_part:
- bs_cache <<= lzcount;
- bs_consumedBits += lzcount;
-
- if (bs_consumedBits <= riceParamPlus1MaxConsumedBits) {
- /* Getting here means the rice parameter part is wholly contained within the current cache line. */
- bs_cache <<= riceParamPlus1;
- bs_consumedBits += riceParamPlus1;
- } else {
- /*
- Getting here means the rice parameter part straddles the cache line. We need to read from the tail of the current cache
- line, reload the cache, and then combine it with the head of the next cache line.
- */
-
- /* Before reloading the cache we need to grab the size in bits of the low part. */
- drflac_uint32 riceParamPartLoBitCount = bs_consumedBits - riceParamPlus1MaxConsumedBits;
- drflac_assert(riceParamPartLoBitCount > 0 && riceParamPartLoBitCount < 32);
-
- /* Now reload the cache. */
- if (bs->nextL2Line < DRFLAC_CACHE_L2_LINE_COUNT(bs)) {
- #ifndef DR_FLAC_NO_CRC
- drflac__update_crc16(bs);
- #endif
- bs_cache = drflac__be2host__cache_line(bs->cacheL2[bs->nextL2Line++]);
- bs_consumedBits = riceParamPartLoBitCount;
- #ifndef DR_FLAC_NO_CRC
- bs->crc16Cache = bs_cache;
- #endif
- } else {
- /* Slow path. We need to fetch more data from the client. */
- if (!drflac__reload_cache(bs)) {
- return DRFLAC_FALSE;
- }
-
- bs_cache = bs->cache;
- bs_consumedBits = bs->consumedBits + riceParamPartLoBitCount;
- }
-
- bs_cache <<= riceParamPartLoBitCount;
- }
- } else {
- /*
- Getting here means there are no bits set on the cache line. This is a less optimal case because we just wasted a call
- to drflac__clz() and we need to reload the cache.
- */
- for (;;) {
- if (bs->nextL2Line < DRFLAC_CACHE_L2_LINE_COUNT(bs)) {
- #ifndef DR_FLAC_NO_CRC
- drflac__update_crc16(bs);
- #endif
- bs_cache = drflac__be2host__cache_line(bs->cacheL2[bs->nextL2Line++]);
- bs_consumedBits = 0;
- #ifndef DR_FLAC_NO_CRC
- bs->crc16Cache = bs_cache;
- #endif
- } else {
- /* Slow path. We need to fetch more data from the client. */
- if (!drflac__reload_cache(bs)) {
- return DRFLAC_FALSE;
- }
-
- bs_cache = bs->cache;
- bs_consumedBits = bs->consumedBits;
- }
-
- lzcount = drflac__clz(bs_cache);
- if (lzcount < sizeof(bs_cache)*8) {
- break;
- }
- }
-
- goto extract_rice_param_part;
- }
-
- /* Make sure the cache is restored at the end of it all. */
- bs->cache = bs_cache;
- bs->consumedBits = bs_consumedBits;
-
- return DRFLAC_TRUE;
-}
-
-
-static drflac_bool32 drflac__decode_samples_with_residual__rice__scalar(drflac_bs* bs, drflac_uint32 bitsPerSample, drflac_uint32 count, drflac_uint8 riceParam, drflac_uint32 order, drflac_int32 shift, const drflac_int32* coefficients, drflac_int32* pSamplesOut)
-{
- drflac_uint32 t[2] = {0x00000000, 0xFFFFFFFF};
- drflac_uint32 zeroCountPart0;
- drflac_uint32 zeroCountPart1;
- drflac_uint32 zeroCountPart2;
- drflac_uint32 zeroCountPart3;
- drflac_uint32 riceParamPart0;
- drflac_uint32 riceParamPart1;
- drflac_uint32 riceParamPart2;
- drflac_uint32 riceParamPart3;
- drflac_uint32 riceParamMask;
- const drflac_int32* pSamplesOutEnd;
- drflac_uint32 i;
-
- drflac_assert(bs != NULL);
- drflac_assert(count > 0);
- drflac_assert(pSamplesOut != NULL);
-
- riceParamMask = ~((~0UL) << riceParam);
- pSamplesOutEnd = pSamplesOut + ((count >> 2) << 2);
-
- if (bitsPerSample >= 24) {
- while (pSamplesOut < pSamplesOutEnd) {
- /*
- Rice extraction. It's faster to do this one at a time against local variables than it is to use the x4 version
- against an array. Not sure why, but perhaps it's making more efficient use of registers?
- */
- if (!drflac__read_rice_parts_x1(bs, riceParam, &zeroCountPart0, &riceParamPart0) ||
- !drflac__read_rice_parts_x1(bs, riceParam, &zeroCountPart1, &riceParamPart1) ||
- !drflac__read_rice_parts_x1(bs, riceParam, &zeroCountPart2, &riceParamPart2) ||
- !drflac__read_rice_parts_x1(bs, riceParam, &zeroCountPart3, &riceParamPart3)) {
- return DRFLAC_FALSE;
- }
-
- riceParamPart0 &= riceParamMask;
- riceParamPart1 &= riceParamMask;
- riceParamPart2 &= riceParamMask;
- riceParamPart3 &= riceParamMask;
-
- riceParamPart0 |= (zeroCountPart0 << riceParam);
- riceParamPart1 |= (zeroCountPart1 << riceParam);
- riceParamPart2 |= (zeroCountPart2 << riceParam);
- riceParamPart3 |= (zeroCountPart3 << riceParam);
-
- riceParamPart0 = (riceParamPart0 >> 1) ^ t[riceParamPart0 & 0x01];
- riceParamPart1 = (riceParamPart1 >> 1) ^ t[riceParamPart1 & 0x01];
- riceParamPart2 = (riceParamPart2 >> 1) ^ t[riceParamPart2 & 0x01];
- riceParamPart3 = (riceParamPart3 >> 1) ^ t[riceParamPart3 & 0x01];
-
- pSamplesOut[0] = riceParamPart0 + drflac__calculate_prediction_64(order, shift, coefficients, pSamplesOut + 0);
- pSamplesOut[1] = riceParamPart1 + drflac__calculate_prediction_64(order, shift, coefficients, pSamplesOut + 1);
- pSamplesOut[2] = riceParamPart2 + drflac__calculate_prediction_64(order, shift, coefficients, pSamplesOut + 2);
- pSamplesOut[3] = riceParamPart3 + drflac__calculate_prediction_64(order, shift, coefficients, pSamplesOut + 3);
-
- pSamplesOut += 4;
- }
- } else {
- while (pSamplesOut < pSamplesOutEnd) {
- if (!drflac__read_rice_parts_x1(bs, riceParam, &zeroCountPart0, &riceParamPart0) ||
- !drflac__read_rice_parts_x1(bs, riceParam, &zeroCountPart1, &riceParamPart1) ||
- !drflac__read_rice_parts_x1(bs, riceParam, &zeroCountPart2, &riceParamPart2) ||
- !drflac__read_rice_parts_x1(bs, riceParam, &zeroCountPart3, &riceParamPart3)) {
- return DRFLAC_FALSE;
- }
-
- riceParamPart0 &= riceParamMask;
- riceParamPart1 &= riceParamMask;
- riceParamPart2 &= riceParamMask;
- riceParamPart3 &= riceParamMask;
-
- riceParamPart0 |= (zeroCountPart0 << riceParam);
- riceParamPart1 |= (zeroCountPart1 << riceParam);
- riceParamPart2 |= (zeroCountPart2 << riceParam);
- riceParamPart3 |= (zeroCountPart3 << riceParam);
-
- riceParamPart0 = (riceParamPart0 >> 1) ^ t[riceParamPart0 & 0x01];
- riceParamPart1 = (riceParamPart1 >> 1) ^ t[riceParamPart1 & 0x01];
- riceParamPart2 = (riceParamPart2 >> 1) ^ t[riceParamPart2 & 0x01];
- riceParamPart3 = (riceParamPart3 >> 1) ^ t[riceParamPart3 & 0x01];
-
- pSamplesOut[0] = riceParamPart0 + drflac__calculate_prediction_32(order, shift, coefficients, pSamplesOut + 0);
- pSamplesOut[1] = riceParamPart1 + drflac__calculate_prediction_32(order, shift, coefficients, pSamplesOut + 1);
- pSamplesOut[2] = riceParamPart2 + drflac__calculate_prediction_32(order, shift, coefficients, pSamplesOut + 2);
- pSamplesOut[3] = riceParamPart3 + drflac__calculate_prediction_32(order, shift, coefficients, pSamplesOut + 3);
-
- pSamplesOut += 4;
- }
- }
-
- i = ((count >> 2) << 2);
- while (i < count) {
- /* Rice extraction. */
- if (!drflac__read_rice_parts_x1(bs, riceParam, &zeroCountPart0, &riceParamPart0)) {
- return DRFLAC_FALSE;
- }
-
- /* Rice reconstruction. */
- riceParamPart0 &= riceParamMask;
- riceParamPart0 |= (zeroCountPart0 << riceParam);
- riceParamPart0 = (riceParamPart0 >> 1) ^ t[riceParamPart0 & 0x01];
- /*riceParamPart0 = (riceParamPart0 >> 1) ^ (~(riceParamPart0 & 0x01) + 1);*/
-
- /* Sample reconstruction. */
- if (bitsPerSample >= 24) {
- pSamplesOut[0] = riceParamPart0 + drflac__calculate_prediction_64(order, shift, coefficients, pSamplesOut + 0);
- } else {
- pSamplesOut[0] = riceParamPart0 + drflac__calculate_prediction_32(order, shift, coefficients, pSamplesOut + 0);
- }
-
- i += 1;
- pSamplesOut += 1;
- }
-
- return DRFLAC_TRUE;
-}
-
-#if defined(DRFLAC_SUPPORT_SSE41)
-static drflac_bool32 drflac__decode_samples_with_residual__rice__sse41(drflac_bs* bs, drflac_uint32 bitsPerSample, drflac_uint32 count, drflac_uint8 riceParam, drflac_uint32 order, drflac_int32 shift, const drflac_int32* coefficients, drflac_int32* pSamplesOut)
-{
- static drflac_uint32 t[2] = {0x00000000, 0xFFFFFFFF};
-
- /*drflac_uint32 zeroCountParts[4];*/
- /*drflac_uint32 riceParamParts[4];*/
-
- drflac_uint32 zeroCountParts0;
- drflac_uint32 zeroCountParts1;
- drflac_uint32 zeroCountParts2;
- drflac_uint32 zeroCountParts3;
- drflac_uint32 riceParamParts0;
- drflac_uint32 riceParamParts1;
- drflac_uint32 riceParamParts2;
- drflac_uint32 riceParamParts3;
- drflac_uint32 riceParamMask;
- const drflac_int32* pSamplesOutEnd;
- __m128i riceParamMask128;
- __m128i one;
- drflac_uint32 i;
-
- drflac_assert(bs != NULL);
- drflac_assert(count > 0);
- drflac_assert(pSamplesOut != NULL);
-
- riceParamMask = ~((~0UL) << riceParam);
- riceParamMask128 = _mm_set1_epi32(riceParamMask);
- one = _mm_set1_epi32(0x01);
-
- pSamplesOutEnd = pSamplesOut + ((count >> 2) << 2);
-
- if (bitsPerSample >= 24) {
- while (pSamplesOut < pSamplesOutEnd) {
- __m128i zeroCountPart128;
- __m128i riceParamPart128;
- drflac_uint32 riceParamParts[4];
-
- /* Rice extraction. */
- if (!drflac__read_rice_parts_x1(bs, riceParam, &zeroCountParts0, &riceParamParts0) ||
- !drflac__read_rice_parts_x1(bs, riceParam, &zeroCountParts1, &riceParamParts1) ||
- !drflac__read_rice_parts_x1(bs, riceParam, &zeroCountParts2, &riceParamParts2) ||
- !drflac__read_rice_parts_x1(bs, riceParam, &zeroCountParts3, &riceParamParts3)) {
- return DRFLAC_FALSE;
- }
-
- zeroCountPart128 = _mm_set_epi32(zeroCountParts3, zeroCountParts2, zeroCountParts1, zeroCountParts0);
- riceParamPart128 = _mm_set_epi32(riceParamParts3, riceParamParts2, riceParamParts1, riceParamParts0);
-
- riceParamPart128 = _mm_and_si128(riceParamPart128, riceParamMask128);
- riceParamPart128 = _mm_or_si128(riceParamPart128, _mm_slli_epi32(zeroCountPart128, riceParam));
- riceParamPart128 = _mm_xor_si128(_mm_srli_epi32(riceParamPart128, 1), _mm_mullo_epi32(_mm_and_si128(riceParamPart128, one), _mm_set1_epi32(0xFFFFFFFF))); /* <-- Only supported from SSE4.1 */
- /*riceParamPart128 = _mm_xor_si128(_mm_srli_epi32(riceParamPart128, 1), _mm_add_epi32(drflac__mm_not_si128(_mm_and_si128(riceParamPart128, one)), one));*/ /* <-- SSE2 compatible */
-
- _mm_storeu_si128((__m128i*)riceParamParts, riceParamPart128);
-
- #if defined(DRFLAC_64BIT)
- /* The scalar implementation seems to be faster on 64-bit in my testing. */
- drflac__calculate_prediction_64_x4(order, shift, coefficients, riceParamParts, pSamplesOut);
- #else
- pSamplesOut[0] = riceParamParts[0] + drflac__calculate_prediction_64__sse41(order, shift, coefficients, pSamplesOut + 0);
- pSamplesOut[1] = riceParamParts[1] + drflac__calculate_prediction_64__sse41(order, shift, coefficients, pSamplesOut + 1);
- pSamplesOut[2] = riceParamParts[2] + drflac__calculate_prediction_64__sse41(order, shift, coefficients, pSamplesOut + 2);
- pSamplesOut[3] = riceParamParts[3] + drflac__calculate_prediction_64__sse41(order, shift, coefficients, pSamplesOut + 3);
- #endif
-
- pSamplesOut += 4;
- }
- } else {
- drflac_int32 coefficientsUnaligned[32*4 + 4] = {0};
- drflac_int32* coefficients128 = (drflac_int32*)(((size_t)coefficientsUnaligned + 15) & ~15);
-
- for (i = 0; i < order; ++i) {
- coefficients128[i*4+0] = coefficients[i];
- coefficients128[i*4+1] = coefficients[i];
- coefficients128[i*4+2] = coefficients[i];
- coefficients128[i*4+3] = coefficients[i];
- }
-
- while (pSamplesOut < pSamplesOutEnd) {
- __m128i zeroCountPart128;
- __m128i riceParamPart128;
- /*drflac_int32 riceParamParts[4];*/
-
- /* Rice extraction. */
-#if 1
- if (!drflac__read_rice_parts_x1(bs, riceParam, &zeroCountParts0, &riceParamParts0) ||
- !drflac__read_rice_parts_x1(bs, riceParam, &zeroCountParts1, &riceParamParts1) ||
- !drflac__read_rice_parts_x1(bs, riceParam, &zeroCountParts2, &riceParamParts2) ||
- !drflac__read_rice_parts_x1(bs, riceParam, &zeroCountParts3, &riceParamParts3)) {
- return DRFLAC_FALSE;
- }
-
- zeroCountPart128 = _mm_set_epi32(zeroCountParts3, zeroCountParts2, zeroCountParts1, zeroCountParts0);
- riceParamPart128 = _mm_set_epi32(riceParamParts3, riceParamParts2, riceParamParts1, riceParamParts0);
-#else
- if (!drflac__read_rice_parts_x4(bs, riceParam, zeroCountParts, riceParamParts)) {
- return DRFLAC_FALSE;
- }
-
- zeroCountPart128 = _mm_set_epi32(zeroCountParts[3], zeroCountParts[2], zeroCountParts[1], zeroCountParts[0]);
- riceParamPart128 = _mm_set_epi32(riceParamParts[3], riceParamParts[2], riceParamParts[1], riceParamParts[0]);
-#endif
-
- riceParamPart128 = _mm_and_si128(riceParamPart128, riceParamMask128);
- riceParamPart128 = _mm_or_si128(riceParamPart128, _mm_slli_epi32(zeroCountPart128, riceParam));
- riceParamPart128 = _mm_xor_si128(_mm_srli_epi32(riceParamPart128, 1), _mm_mullo_epi32(_mm_and_si128(riceParamPart128, one), _mm_set1_epi32(0xFFFFFFFF)));
-
-#if 1
- drflac__calculate_prediction_32_x4__sse41(order, shift, (const __m128i*)coefficients128, riceParamPart128, pSamplesOut);
-#else
- _mm_storeu_si128((__m128i*)riceParamParts, riceParamPart128);
-
- pSamplesOut[0] = riceParamParts[0] + drflac__calculate_prediction_32(order, shift, coefficients, pSamplesOut + 0);
- pSamplesOut[1] = riceParamParts[1] + drflac__calculate_prediction_32(order, shift, coefficients, pSamplesOut + 1);
- pSamplesOut[2] = riceParamParts[2] + drflac__calculate_prediction_32(order, shift, coefficients, pSamplesOut + 2);
- pSamplesOut[3] = riceParamParts[3] + drflac__calculate_prediction_32(order, shift, coefficients, pSamplesOut + 3);
-#endif
-
- pSamplesOut += 4;
- }
- }
-
-
- i = ((count >> 2) << 2);
- while (i < count) {
- /* Rice extraction. */
- if (!drflac__read_rice_parts_x1(bs, riceParam, &zeroCountParts0, &riceParamParts0)) {
- return DRFLAC_FALSE;
- }
-
- /* Rice reconstruction. */
- riceParamParts0 &= riceParamMask;
- riceParamParts0 |= (zeroCountParts0 << riceParam);
- riceParamParts0 = (riceParamParts0 >> 1) ^ t[riceParamParts0 & 0x01];
-
- /* Sample reconstruction. */
- if (bitsPerSample >= 24) {
- pSamplesOut[0] = riceParamParts0 + drflac__calculate_prediction_64(order, shift, coefficients, pSamplesOut + 0);
- } else {
- pSamplesOut[0] = riceParamParts0 + drflac__calculate_prediction_32(order, shift, coefficients, pSamplesOut + 0);
- }
-
- i += 1;
- pSamplesOut += 1;
- }
-
- return DRFLAC_TRUE;
-}
-#endif
-
-static drflac_bool32 drflac__decode_samples_with_residual__rice(drflac_bs* bs, drflac_uint32 bitsPerSample, drflac_uint32 count, drflac_uint8 riceParam, drflac_uint32 order, drflac_int32 shift, const drflac_int32* coefficients, drflac_int32* pSamplesOut)
-{
-#if defined(DRFLAC_SUPPORT_SSE41)
- if (drflac__gIsSSE41Supported) {
- return drflac__decode_samples_with_residual__rice__sse41(bs, bitsPerSample, count, riceParam, order, shift, coefficients, pSamplesOut);
- } else
-#endif
- {
- /* Scalar fallback. */
- #if 0
- return drflac__decode_samples_with_residual__rice__reference(bs, bitsPerSample, count, riceParam, order, shift, coefficients, pSamplesOut);
- #else
- return drflac__decode_samples_with_residual__rice__scalar(bs, bitsPerSample, count, riceParam, order, shift, coefficients, pSamplesOut);
- #endif
- }
-}
-
-/* Reads and seeks past a string of residual values as Rice codes. The decoder should be sitting on the first bit of the Rice codes. */
-static drflac_bool32 drflac__read_and_seek_residual__rice(drflac_bs* bs, drflac_uint32 count, drflac_uint8 riceParam)
-{
- drflac_uint32 i;
-
- drflac_assert(bs != NULL);
- drflac_assert(count > 0);
-
- for (i = 0; i < count; ++i) {
- if (!drflac__seek_rice_parts(bs, riceParam)) {
- return DRFLAC_FALSE;
- }
- }
-
- return DRFLAC_TRUE;
-}
-
-static drflac_bool32 drflac__decode_samples_with_residual__unencoded(drflac_bs* bs, drflac_uint32 bitsPerSample, drflac_uint32 count, drflac_uint8 unencodedBitsPerSample, drflac_uint32 order, drflac_int32 shift, const drflac_int32* coefficients, drflac_int32* pSamplesOut)
-{
- drflac_uint32 i;
-
- drflac_assert(bs != NULL);
- drflac_assert(count > 0);
- drflac_assert(unencodedBitsPerSample <= 31); /* <-- unencodedBitsPerSample is a 5 bit number, so cannot exceed 31. */
- drflac_assert(pSamplesOut != NULL);
-
- for (i = 0; i < count; ++i) {
- if (unencodedBitsPerSample > 0) {
- if (!drflac__read_int32(bs, unencodedBitsPerSample, pSamplesOut + i)) {
- return DRFLAC_FALSE;
- }
- } else {
- pSamplesOut[i] = 0;
- }
-
- if (bitsPerSample > 16) {
- pSamplesOut[i] += drflac__calculate_prediction_64(order, shift, coefficients, pSamplesOut + i);
- } else {
- pSamplesOut[i] += drflac__calculate_prediction_32(order, shift, coefficients, pSamplesOut + i);
- }
- }
-
- return DRFLAC_TRUE;
-}
-
-
-/*
-Reads and decodes the residual for the sub-frame the decoder is currently sitting on. This function should be called
-when the decoder is sitting at the very start of the RESIDUAL block. The first <order> residuals will be ignored. The
-<blockSize> and <order> parameters are used to determine how many residual values need to be decoded.
-*/
-static drflac_bool32 drflac__decode_samples_with_residual(drflac_bs* bs, drflac_uint32 bitsPerSample, drflac_uint32 blockSize, drflac_uint32 order, drflac_int32 shift, const drflac_int32* coefficients, drflac_int32* pDecodedSamples)
-{
- drflac_uint8 residualMethod;
- drflac_uint8 partitionOrder;
- drflac_uint32 samplesInPartition;
- drflac_uint32 partitionsRemaining;
-
- drflac_assert(bs != NULL);
- drflac_assert(blockSize != 0);
- drflac_assert(pDecodedSamples != NULL); /* <-- Should we allow NULL, in which case we just seek past the residual rather than do a full decode? */
-
- if (!drflac__read_uint8(bs, 2, &residualMethod)) {
- return DRFLAC_FALSE;
- }
-
- if (residualMethod != DRFLAC_RESIDUAL_CODING_METHOD_PARTITIONED_RICE && residualMethod != DRFLAC_RESIDUAL_CODING_METHOD_PARTITIONED_RICE2) {
- return DRFLAC_FALSE; /* Unknown or unsupported residual coding method. */
- }
-
- /* Ignore the first <order> values. */
- pDecodedSamples += order;
-
- if (!drflac__read_uint8(bs, 4, &partitionOrder)) {
- return DRFLAC_FALSE;
- }
-
- /*
- From the FLAC spec:
- The Rice partition order in a Rice-coded residual section must be less than or equal to 8.
- */
- if (partitionOrder > 8) {
- return DRFLAC_FALSE;
- }
-
- /* Validation check. */
- if ((blockSize / (1 << partitionOrder)) <= order) {
- return DRFLAC_FALSE;
- }
-
- samplesInPartition = (blockSize / (1 << partitionOrder)) - order;
- partitionsRemaining = (1 << partitionOrder);
- for (;;) {
- drflac_uint8 riceParam = 0;
- if (residualMethod == DRFLAC_RESIDUAL_CODING_METHOD_PARTITIONED_RICE) {
- if (!drflac__read_uint8(bs, 4, &riceParam)) {
- return DRFLAC_FALSE;
- }
- if (riceParam == 15) {
- riceParam = 0xFF;
- }
- } else if (residualMethod == DRFLAC_RESIDUAL_CODING_METHOD_PARTITIONED_RICE2) {
- if (!drflac__read_uint8(bs, 5, &riceParam)) {
- return DRFLAC_FALSE;
- }
- if (riceParam == 31) {
- riceParam = 0xFF;
- }
- }
-
- if (riceParam != 0xFF) {
- if (!drflac__decode_samples_with_residual__rice(bs, bitsPerSample, samplesInPartition, riceParam, order, shift, coefficients, pDecodedSamples)) {
- return DRFLAC_FALSE;
- }
- } else {
- unsigned char unencodedBitsPerSample = 0;
- if (!drflac__read_uint8(bs, 5, &unencodedBitsPerSample)) {
- return DRFLAC_FALSE;
- }
-
- if (!drflac__decode_samples_with_residual__unencoded(bs, bitsPerSample, samplesInPartition, unencodedBitsPerSample, order, shift, coefficients, pDecodedSamples)) {
- return DRFLAC_FALSE;
- }
- }
-
- pDecodedSamples += samplesInPartition;
-
- if (partitionsRemaining == 1) {
- break;
- }
-
- partitionsRemaining -= 1;
-
- if (partitionOrder != 0) {
- samplesInPartition = blockSize / (1 << partitionOrder);
- }
- }
-
- return DRFLAC_TRUE;
-}
-
-/*
-Reads and seeks past the residual for the sub-frame the decoder is currently sitting on. This function should be called
-when the decoder is sitting at the very start of the RESIDUAL block. The first <order> residuals will be set to 0. The
-<blockSize> and <order> parameters are used to determine how many residual values need to be decoded.
-*/
-static drflac_bool32 drflac__read_and_seek_residual(drflac_bs* bs, drflac_uint32 blockSize, drflac_uint32 order)
-{
- drflac_uint8 residualMethod;
- drflac_uint8 partitionOrder;
- drflac_uint32 samplesInPartition;
- drflac_uint32 partitionsRemaining;
-
- drflac_assert(bs != NULL);
- drflac_assert(blockSize != 0);
-
- if (!drflac__read_uint8(bs, 2, &residualMethod)) {
- return DRFLAC_FALSE;
- }
-
- if (residualMethod != DRFLAC_RESIDUAL_CODING_METHOD_PARTITIONED_RICE && residualMethod != DRFLAC_RESIDUAL_CODING_METHOD_PARTITIONED_RICE2) {
- return DRFLAC_FALSE; /* Unknown or unsupported residual coding method. */
- }
-
- if (!drflac__read_uint8(bs, 4, &partitionOrder)) {
- return DRFLAC_FALSE;
- }
-
- /*
- From the FLAC spec:
- The Rice partition order in a Rice-coded residual section must be less than or equal to 8.
- */
- if (partitionOrder > 8) {
- return DRFLAC_FALSE;
- }
-
- /* Validation check. */
- if ((blockSize / (1 << partitionOrder)) <= order) {
- return DRFLAC_FALSE;
- }
-
- samplesInPartition = (blockSize / (1 << partitionOrder)) - order;
- partitionsRemaining = (1 << partitionOrder);
- for (;;)
- {
- drflac_uint8 riceParam = 0;
- if (residualMethod == DRFLAC_RESIDUAL_CODING_METHOD_PARTITIONED_RICE) {
- if (!drflac__read_uint8(bs, 4, &riceParam)) {
- return DRFLAC_FALSE;
- }
- if (riceParam == 15) {
- riceParam = 0xFF;
- }
- } else if (residualMethod == DRFLAC_RESIDUAL_CODING_METHOD_PARTITIONED_RICE2) {
- if (!drflac__read_uint8(bs, 5, &riceParam)) {
- return DRFLAC_FALSE;
- }
- if (riceParam == 31) {
- riceParam = 0xFF;
- }
- }
-
- if (riceParam != 0xFF) {
- if (!drflac__read_and_seek_residual__rice(bs, samplesInPartition, riceParam)) {
- return DRFLAC_FALSE;
- }
- } else {
- unsigned char unencodedBitsPerSample = 0;
- if (!drflac__read_uint8(bs, 5, &unencodedBitsPerSample)) {
- return DRFLAC_FALSE;
- }
-
- if (!drflac__seek_bits(bs, unencodedBitsPerSample * samplesInPartition)) {
- return DRFLAC_FALSE;
- }
- }
-
-
- if (partitionsRemaining == 1) {
- break;
- }
-
- partitionsRemaining -= 1;
- samplesInPartition = blockSize / (1 << partitionOrder);
- }
-
- return DRFLAC_TRUE;
-}
-
-
-static drflac_bool32 drflac__decode_samples__constant(drflac_bs* bs, drflac_uint32 blockSize, drflac_uint32 bitsPerSample, drflac_int32* pDecodedSamples)
-{
- drflac_uint32 i;
-
- /* Only a single sample needs to be decoded here. */
- drflac_int32 sample;
- if (!drflac__read_int32(bs, bitsPerSample, &sample)) {
- return DRFLAC_FALSE;
- }
-
- /*
- We don't really need to expand this, but it does simplify the process of reading samples. If this becomes a performance issue (unlikely)
- we'll want to look at a more efficient way.
- */
- for (i = 0; i < blockSize; ++i) {
- pDecodedSamples[i] = sample;
- }
-
- return DRFLAC_TRUE;
-}
-
-static drflac_bool32 drflac__decode_samples__verbatim(drflac_bs* bs, drflac_uint32 blockSize, drflac_uint32 bitsPerSample, drflac_int32* pDecodedSamples)
-{
- drflac_uint32 i;
-
- for (i = 0; i < blockSize; ++i) {
- drflac_int32 sample;
- if (!drflac__read_int32(bs, bitsPerSample, &sample)) {
- return DRFLAC_FALSE;
- }
-
- pDecodedSamples[i] = sample;
- }
-
- return DRFLAC_TRUE;
-}
-
-static drflac_bool32 drflac__decode_samples__fixed(drflac_bs* bs, drflac_uint32 blockSize, drflac_uint32 bitsPerSample, drflac_uint8 lpcOrder, drflac_int32* pDecodedSamples)
-{
- drflac_uint32 i;
-
- static drflac_int32 lpcCoefficientsTable[5][4] = {
- {0, 0, 0, 0},
- {1, 0, 0, 0},
- {2, -1, 0, 0},
- {3, -3, 1, 0},
- {4, -6, 4, -1}
- };
-
- /* Warm up samples and coefficients. */
- for (i = 0; i < lpcOrder; ++i) {
- drflac_int32 sample;
- if (!drflac__read_int32(bs, bitsPerSample, &sample)) {
- return DRFLAC_FALSE;
- }
-
- pDecodedSamples[i] = sample;
- }
-
- if (!drflac__decode_samples_with_residual(bs, bitsPerSample, blockSize, lpcOrder, 0, lpcCoefficientsTable[lpcOrder], pDecodedSamples)) {
- return DRFLAC_FALSE;
- }
-
- return DRFLAC_TRUE;
-}
-
-static drflac_bool32 drflac__decode_samples__lpc(drflac_bs* bs, drflac_uint32 blockSize, drflac_uint32 bitsPerSample, drflac_uint8 lpcOrder, drflac_int32* pDecodedSamples)
-{
- drflac_uint8 i;
- drflac_uint8 lpcPrecision;
- drflac_int8 lpcShift;
- drflac_int32 coefficients[32];
-
- /* Warm up samples. */
- for (i = 0; i < lpcOrder; ++i) {
- drflac_int32 sample;
- if (!drflac__read_int32(bs, bitsPerSample, &sample)) {
- return DRFLAC_FALSE;
- }
-
- pDecodedSamples[i] = sample;
- }
-
- if (!drflac__read_uint8(bs, 4, &lpcPrecision)) {
- return DRFLAC_FALSE;
- }
- if (lpcPrecision == 15) {
- return DRFLAC_FALSE; /* Invalid. */
- }
- lpcPrecision += 1;
-
- if (!drflac__read_int8(bs, 5, &lpcShift)) {
- return DRFLAC_FALSE;
- }
-
- drflac_zero_memory(coefficients, sizeof(coefficients));
- for (i = 0; i < lpcOrder; ++i) {
- if (!drflac__read_int32(bs, lpcPrecision, coefficients + i)) {
- return DRFLAC_FALSE;
- }
- }
-
- if (!drflac__decode_samples_with_residual(bs, bitsPerSample, blockSize, lpcOrder, lpcShift, coefficients, pDecodedSamples)) {
- return DRFLAC_FALSE;
- }
-
- return DRFLAC_TRUE;
-}
-
-
-static drflac_bool32 drflac__read_next_flac_frame_header(drflac_bs* bs, drflac_uint8 streaminfoBitsPerSample, drflac_frame_header* header)
-{
- const drflac_uint32 sampleRateTable[12] = {0, 88200, 176400, 192000, 8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000};
- const drflac_uint8 bitsPerSampleTable[8] = {0, 8, 12, (drflac_uint8)-1, 16, 20, 24, (drflac_uint8)-1}; /* -1 = reserved. */
-
- drflac_assert(bs != NULL);
- drflac_assert(header != NULL);
-
- /* Keep looping until we find a valid sync code. */
- for (;;) {
- drflac_uint8 crc8 = 0xCE; /* 0xCE = drflac_crc8(0, 0x3FFE, 14); */
- drflac_uint8 reserved = 0;
- drflac_uint8 blockingStrategy = 0;
- drflac_uint8 blockSize = 0;
- drflac_uint8 sampleRate = 0;
- drflac_uint8 channelAssignment = 0;
- drflac_uint8 bitsPerSample = 0;
- drflac_bool32 isVariableBlockSize;
-
- if (!drflac__find_and_seek_to_next_sync_code(bs)) {
- return DRFLAC_FALSE;
- }
-
- if (!drflac__read_uint8(bs, 1, &reserved)) {
- return DRFLAC_FALSE;
- }
- if (reserved == 1) {
- continue;
- }
- crc8 = drflac_crc8(crc8, reserved, 1);
-
- if (!drflac__read_uint8(bs, 1, &blockingStrategy)) {
- return DRFLAC_FALSE;
- }
- crc8 = drflac_crc8(crc8, blockingStrategy, 1);
-
- if (!drflac__read_uint8(bs, 4, &blockSize)) {
- return DRFLAC_FALSE;
- }
- if (blockSize == 0) {
- continue;
- }
- crc8 = drflac_crc8(crc8, blockSize, 4);
-
- if (!drflac__read_uint8(bs, 4, &sampleRate)) {
- return DRFLAC_FALSE;
- }
- crc8 = drflac_crc8(crc8, sampleRate, 4);
-
- if (!drflac__read_uint8(bs, 4, &channelAssignment)) {
- return DRFLAC_FALSE;
- }
- if (channelAssignment > 10) {
- continue;
- }
- crc8 = drflac_crc8(crc8, channelAssignment, 4);
-
- if (!drflac__read_uint8(bs, 3, &bitsPerSample)) {
- return DRFLAC_FALSE;
- }
- if (bitsPerSample == 3 || bitsPerSample == 7) {
- continue;
- }
- crc8 = drflac_crc8(crc8, bitsPerSample, 3);
-
-
- if (!drflac__read_uint8(bs, 1, &reserved)) {
- return DRFLAC_FALSE;
- }
- if (reserved == 1) {
- continue;
- }
- crc8 = drflac_crc8(crc8, reserved, 1);
-
-
- isVariableBlockSize = blockingStrategy == 1;
- if (isVariableBlockSize) {
- drflac_uint64 sampleNumber;
- drflac_result result = drflac__read_utf8_coded_number(bs, &sampleNumber, &crc8);
- if (result != DRFLAC_SUCCESS) {
- if (result == DRFLAC_END_OF_STREAM) {
- return DRFLAC_FALSE;
- } else {
- continue;
- }
- }
- header->frameNumber = 0;
- header->sampleNumber = sampleNumber;
- } else {
- drflac_uint64 frameNumber = 0;
- drflac_result result = drflac__read_utf8_coded_number(bs, &frameNumber, &crc8);
- if (result != DRFLAC_SUCCESS) {
- if (result == DRFLAC_END_OF_STREAM) {
- return DRFLAC_FALSE;
- } else {
- continue;
- }
- }
- header->frameNumber = (drflac_uint32)frameNumber; /* <-- Safe cast. */
- header->sampleNumber = 0;
- }
-
-
- if (blockSize == 1) {
- header->blockSize = 192;
- } else if (blockSize >= 2 && blockSize <= 5) {
- header->blockSize = 576 * (1 << (blockSize - 2));
- } else if (blockSize == 6) {
- if (!drflac__read_uint16(bs, 8, &header->blockSize)) {
- return DRFLAC_FALSE;
- }
- crc8 = drflac_crc8(crc8, header->blockSize, 8);
- header->blockSize += 1;
- } else if (blockSize == 7) {
- if (!drflac__read_uint16(bs, 16, &header->blockSize)) {
- return DRFLAC_FALSE;
- }
- crc8 = drflac_crc8(crc8, header->blockSize, 16);
- header->blockSize += 1;
- } else {
- header->blockSize = 256 * (1 << (blockSize - 8));
- }
-
-
- if (sampleRate <= 11) {
- header->sampleRate = sampleRateTable[sampleRate];
- } else if (sampleRate == 12) {
- if (!drflac__read_uint32(bs, 8, &header->sampleRate)) {
- return DRFLAC_FALSE;
- }
- crc8 = drflac_crc8(crc8, header->sampleRate, 8);
- header->sampleRate *= 1000;
- } else if (sampleRate == 13) {
- if (!drflac__read_uint32(bs, 16, &header->sampleRate)) {
- return DRFLAC_FALSE;
- }
- crc8 = drflac_crc8(crc8, header->sampleRate, 16);
- } else if (sampleRate == 14) {
- if (!drflac__read_uint32(bs, 16, &header->sampleRate)) {
- return DRFLAC_FALSE;
- }
- crc8 = drflac_crc8(crc8, header->sampleRate, 16);
- header->sampleRate *= 10;
- } else {
- continue; /* Invalid. Assume an invalid block. */
- }
-
-
- header->channelAssignment = channelAssignment;
-
- header->bitsPerSample = bitsPerSampleTable[bitsPerSample];
- if (header->bitsPerSample == 0) {
- header->bitsPerSample = streaminfoBitsPerSample;
- }
-
- if (!drflac__read_uint8(bs, 8, &header->crc8)) {
- return DRFLAC_FALSE;
- }
-
-#ifndef DR_FLAC_NO_CRC
- if (header->crc8 != crc8) {
- continue; /* CRC mismatch. Loop back to the top and find the next sync code. */
- }
-#endif
- return DRFLAC_TRUE;
- }
-}
-
-static drflac_bool32 drflac__read_subframe_header(drflac_bs* bs, drflac_subframe* pSubframe)
-{
- drflac_uint8 header;
- int type;
-
- if (!drflac__read_uint8(bs, 8, &header)) {
- return DRFLAC_FALSE;
- }
-
- /* First bit should always be 0. */
- if ((header & 0x80) != 0) {
- return DRFLAC_FALSE;
- }
-
- type = (header & 0x7E) >> 1;
- if (type == 0) {
- pSubframe->subframeType = DRFLAC_SUBFRAME_CONSTANT;
- } else if (type == 1) {
- pSubframe->subframeType = DRFLAC_SUBFRAME_VERBATIM;
- } else {
- if ((type & 0x20) != 0) {
- pSubframe->subframeType = DRFLAC_SUBFRAME_LPC;
- pSubframe->lpcOrder = (type & 0x1F) + 1;
- } else if ((type & 0x08) != 0) {
- pSubframe->subframeType = DRFLAC_SUBFRAME_FIXED;
- pSubframe->lpcOrder = (type & 0x07);
- if (pSubframe->lpcOrder > 4) {
- pSubframe->subframeType = DRFLAC_SUBFRAME_RESERVED;
- pSubframe->lpcOrder = 0;
- }
- } else {
- pSubframe->subframeType = DRFLAC_SUBFRAME_RESERVED;
- }
- }
-
- if (pSubframe->subframeType == DRFLAC_SUBFRAME_RESERVED) {
- return DRFLAC_FALSE;
- }
-
- /* Wasted bits per sample. */
- pSubframe->wastedBitsPerSample = 0;
- if ((header & 0x01) == 1) {
- unsigned int wastedBitsPerSample;
- if (!drflac__seek_past_next_set_bit(bs, &wastedBitsPerSample)) {
- return DRFLAC_FALSE;
- }
- pSubframe->wastedBitsPerSample = (unsigned char)wastedBitsPerSample + 1;
- }
-
- return DRFLAC_TRUE;
-}
-
-static drflac_bool32 drflac__decode_subframe(drflac_bs* bs, drflac_frame* frame, int subframeIndex, drflac_int32* pDecodedSamplesOut)
-{
- drflac_subframe* pSubframe;
-
- drflac_assert(bs != NULL);
- drflac_assert(frame != NULL);
-
- pSubframe = frame->subframes + subframeIndex;
- if (!drflac__read_subframe_header(bs, pSubframe)) {
- return DRFLAC_FALSE;
- }
-
- /* Side channels require an extra bit per sample. Took a while to figure that one out... */
- pSubframe->bitsPerSample = frame->header.bitsPerSample;
- if ((frame->header.channelAssignment == DRFLAC_CHANNEL_ASSIGNMENT_LEFT_SIDE || frame->header.channelAssignment == DRFLAC_CHANNEL_ASSIGNMENT_MID_SIDE) && subframeIndex == 1) {
- pSubframe->bitsPerSample += 1;
- } else if (frame->header.channelAssignment == DRFLAC_CHANNEL_ASSIGNMENT_RIGHT_SIDE && subframeIndex == 0) {
- pSubframe->bitsPerSample += 1;
- }
-
- /* Need to handle wasted bits per sample. */
- if (pSubframe->wastedBitsPerSample >= pSubframe->bitsPerSample) {
- return DRFLAC_FALSE;
- }
- pSubframe->bitsPerSample -= pSubframe->wastedBitsPerSample;
- pSubframe->pDecodedSamples = pDecodedSamplesOut;
-
- switch (pSubframe->subframeType)
- {
- case DRFLAC_SUBFRAME_CONSTANT:
- {
- drflac__decode_samples__constant(bs, frame->header.blockSize, pSubframe->bitsPerSample, pSubframe->pDecodedSamples);
- } break;
-
- case DRFLAC_SUBFRAME_VERBATIM:
- {
- drflac__decode_samples__verbatim(bs, frame->header.blockSize, pSubframe->bitsPerSample, pSubframe->pDecodedSamples);
- } break;
-
- case DRFLAC_SUBFRAME_FIXED:
- {
- drflac__decode_samples__fixed(bs, frame->header.blockSize, pSubframe->bitsPerSample, pSubframe->lpcOrder, pSubframe->pDecodedSamples);
- } break;
-
- case DRFLAC_SUBFRAME_LPC:
- {
- drflac__decode_samples__lpc(bs, frame->header.blockSize, pSubframe->bitsPerSample, pSubframe->lpcOrder, pSubframe->pDecodedSamples);
- } break;
-
- default: return DRFLAC_FALSE;
- }
-
- return DRFLAC_TRUE;
-}
-
-static drflac_bool32 drflac__seek_subframe(drflac_bs* bs, drflac_frame* frame, int subframeIndex)
-{
- drflac_subframe* pSubframe;
-
- drflac_assert(bs != NULL);
- drflac_assert(frame != NULL);
-
- pSubframe = frame->subframes + subframeIndex;
- if (!drflac__read_subframe_header(bs, pSubframe)) {
- return DRFLAC_FALSE;
- }
-
- /* Side channels require an extra bit per sample. Took a while to figure that one out... */
- pSubframe->bitsPerSample = frame->header.bitsPerSample;
- if ((frame->header.channelAssignment == DRFLAC_CHANNEL_ASSIGNMENT_LEFT_SIDE || frame->header.channelAssignment == DRFLAC_CHANNEL_ASSIGNMENT_MID_SIDE) && subframeIndex == 1) {
- pSubframe->bitsPerSample += 1;
- } else if (frame->header.channelAssignment == DRFLAC_CHANNEL_ASSIGNMENT_RIGHT_SIDE && subframeIndex == 0) {
- pSubframe->bitsPerSample += 1;
- }
-
- /* Need to handle wasted bits per sample. */
- if (pSubframe->wastedBitsPerSample >= pSubframe->bitsPerSample) {
- return DRFLAC_FALSE;
- }
- pSubframe->bitsPerSample -= pSubframe->wastedBitsPerSample;
- pSubframe->pDecodedSamples = NULL;
-
- switch (pSubframe->subframeType)
- {
- case DRFLAC_SUBFRAME_CONSTANT:
- {
- if (!drflac__seek_bits(bs, pSubframe->bitsPerSample)) {
- return DRFLAC_FALSE;
- }
- } break;
-
- case DRFLAC_SUBFRAME_VERBATIM:
- {
- unsigned int bitsToSeek = frame->header.blockSize * pSubframe->bitsPerSample;
- if (!drflac__seek_bits(bs, bitsToSeek)) {
- return DRFLAC_FALSE;
- }
- } break;
-
- case DRFLAC_SUBFRAME_FIXED:
- {
- unsigned int bitsToSeek = pSubframe->lpcOrder * pSubframe->bitsPerSample;
- if (!drflac__seek_bits(bs, bitsToSeek)) {
- return DRFLAC_FALSE;
- }
-
- if (!drflac__read_and_seek_residual(bs, frame->header.blockSize, pSubframe->lpcOrder)) {
- return DRFLAC_FALSE;
- }
- } break;
-
- case DRFLAC_SUBFRAME_LPC:
- {
- unsigned char lpcPrecision;
-
- unsigned int bitsToSeek = pSubframe->lpcOrder * pSubframe->bitsPerSample;
- if (!drflac__seek_bits(bs, bitsToSeek)) {
- return DRFLAC_FALSE;
- }
-
- if (!drflac__read_uint8(bs, 4, &lpcPrecision)) {
- return DRFLAC_FALSE;
- }
- if (lpcPrecision == 15) {
- return DRFLAC_FALSE; /* Invalid. */
- }
- lpcPrecision += 1;
-
-
- bitsToSeek = (pSubframe->lpcOrder * lpcPrecision) + 5; /* +5 for shift. */
- if (!drflac__seek_bits(bs, bitsToSeek)) {
- return DRFLAC_FALSE;
- }
-
- if (!drflac__read_and_seek_residual(bs, frame->header.blockSize, pSubframe->lpcOrder)) {
- return DRFLAC_FALSE;
- }
- } break;
-
- default: return DRFLAC_FALSE;
- }
-
- return DRFLAC_TRUE;
-}
-
-
-static DRFLAC_INLINE drflac_uint8 drflac__get_channel_count_from_channel_assignment(drflac_int8 channelAssignment)
-{
- drflac_uint8 lookup[] = {1, 2, 3, 4, 5, 6, 7, 8, 2, 2, 2};
-
- drflac_assert(channelAssignment <= 10);
- return lookup[channelAssignment];
-}
-
-static drflac_result drflac__decode_flac_frame(drflac* pFlac)
-{
- int channelCount;
- int i;
- drflac_uint8 paddingSizeInBits;
- drflac_uint16 desiredCRC16;
-#ifndef DR_FLAC_NO_CRC
- drflac_uint16 actualCRC16;
-#endif
-
- /* This function should be called while the stream is sitting on the first byte after the frame header. */
- drflac_zero_memory(pFlac->currentFrame.subframes, sizeof(pFlac->currentFrame.subframes));
-
- /* The frame block size must never be larger than the maximum block size defined by the FLAC stream. */
- if (pFlac->currentFrame.header.blockSize > pFlac->maxBlockSize) {
- return DRFLAC_ERROR;
- }
-
- /* The number of channels in the frame must match the channel count from the STREAMINFO block. */
- channelCount = drflac__get_channel_count_from_channel_assignment(pFlac->currentFrame.header.channelAssignment);
- if (channelCount != (int)pFlac->channels) {
- return DRFLAC_ERROR;
- }
-
- for (i = 0; i < channelCount; ++i) {
- if (!drflac__decode_subframe(&pFlac->bs, &pFlac->currentFrame, i, pFlac->pDecodedSamples + ((pFlac->currentFrame.header.blockSize+DRFLAC_LEADING_SAMPLES) * i) + DRFLAC_LEADING_SAMPLES)) {
- return DRFLAC_ERROR;
- }
- }
-
- paddingSizeInBits = DRFLAC_CACHE_L1_BITS_REMAINING(&pFlac->bs) & 7;
- if (paddingSizeInBits > 0) {
- drflac_uint8 padding = 0;
- if (!drflac__read_uint8(&pFlac->bs, paddingSizeInBits, &padding)) {
- return DRFLAC_END_OF_STREAM;
- }
- }
-
-#ifndef DR_FLAC_NO_CRC
- actualCRC16 = drflac__flush_crc16(&pFlac->bs);
-#endif
- if (!drflac__read_uint16(&pFlac->bs, 16, &desiredCRC16)) {
- return DRFLAC_END_OF_STREAM;
- }
-
-#ifndef DR_FLAC_NO_CRC
- if (actualCRC16 != desiredCRC16) {
- return DRFLAC_CRC_MISMATCH; /* CRC mismatch. */
- }
-#endif
-
- pFlac->currentFrame.samplesRemaining = pFlac->currentFrame.header.blockSize * channelCount;
-
- return DRFLAC_SUCCESS;
-}
-
-static drflac_result drflac__seek_flac_frame(drflac* pFlac)
-{
- int channelCount;
- int i;
- drflac_uint16 desiredCRC16;
-#ifndef DR_FLAC_NO_CRC
- drflac_uint16 actualCRC16;
-#endif
-
- channelCount = drflac__get_channel_count_from_channel_assignment(pFlac->currentFrame.header.channelAssignment);
- for (i = 0; i < channelCount; ++i) {
- if (!drflac__seek_subframe(&pFlac->bs, &pFlac->currentFrame, i)) {
- return DRFLAC_ERROR;
- }
- }
-
- /* Padding. */
- if (!drflac__seek_bits(&pFlac->bs, DRFLAC_CACHE_L1_BITS_REMAINING(&pFlac->bs) & 7)) {
- return DRFLAC_ERROR;
- }
-
- /* CRC. */
-#ifndef DR_FLAC_NO_CRC
- actualCRC16 = drflac__flush_crc16(&pFlac->bs);
-#endif
- if (!drflac__read_uint16(&pFlac->bs, 16, &desiredCRC16)) {
- return DRFLAC_END_OF_STREAM;
- }
-
-#ifndef DR_FLAC_NO_CRC
- if (actualCRC16 != desiredCRC16) {
- return DRFLAC_CRC_MISMATCH; /* CRC mismatch. */
- }
-#endif
-
- return DRFLAC_SUCCESS;
-}
-
-static drflac_bool32 drflac__read_and_decode_next_flac_frame(drflac* pFlac)
-{
- drflac_assert(pFlac != NULL);
-
- for (;;) {
- drflac_result result;
-
- if (!drflac__read_next_flac_frame_header(&pFlac->bs, pFlac->bitsPerSample, &pFlac->currentFrame.header)) {
- return DRFLAC_FALSE;
- }
-
- result = drflac__decode_flac_frame(pFlac);
- if (result != DRFLAC_SUCCESS) {
- if (result == DRFLAC_CRC_MISMATCH) {
- continue; /* CRC mismatch. Skip to the next frame. */
- } else {
- return DRFLAC_FALSE;
- }
- }
-
- return DRFLAC_TRUE;
- }
-}
-
-
-static void drflac__get_current_frame_sample_range(drflac* pFlac, drflac_uint64* pFirstSampleInFrameOut, drflac_uint64* pLastSampleInFrameOut)
-{
- unsigned int channelCount;
- drflac_uint64 firstSampleInFrame;
- drflac_uint64 lastSampleInFrame;
-
- drflac_assert(pFlac != NULL);
-
- channelCount = drflac__get_channel_count_from_channel_assignment(pFlac->currentFrame.header.channelAssignment);
-
- firstSampleInFrame = pFlac->currentFrame.header.sampleNumber*channelCount;
- if (firstSampleInFrame == 0) {
- firstSampleInFrame = pFlac->currentFrame.header.frameNumber * pFlac->maxBlockSize*channelCount;
- }
-
- lastSampleInFrame = firstSampleInFrame + (pFlac->currentFrame.header.blockSize*channelCount);
- if (lastSampleInFrame > 0) {
- lastSampleInFrame -= 1; /* Needs to be zero based. */
- }
-
- if (pFirstSampleInFrameOut) {
- *pFirstSampleInFrameOut = firstSampleInFrame;
- }
- if (pLastSampleInFrameOut) {
- *pLastSampleInFrameOut = lastSampleInFrame;
- }
-}
-
-/* This function will be replacing drflac__get_current_frame_sample_range(), but it's not currently used so I have commented it out to silence a compiler warning. */
-#if 0
-static void drflac__get_pcm_frame_range_of_current_flac_frame(drflac* pFlac, drflac_uint64* pFirstPCMFrame, drflac_uint64* pLastPCMFrame)
-{
- drflac_uint64 firstPCMFrame;
- drflac_uint64 lastPCMFrame;
-
- drflac_assert(pFlac != NULL);
-
- firstPCMFrame = pFlac->currentFrame.header.sampleNumber;
- if (firstPCMFrame == 0) {
- firstPCMFrame = pFlac->currentFrame.header.frameNumber * pFlac->maxBlockSize;
- }
-
- lastPCMFrame = firstPCMFrame + (pFlac->currentFrame.header.blockSize);
- if (lastPCMFrame > 0) {
- lastPCMFrame -= 1; /* Needs to be zero based. */
- }
-
- if (pFirstPCMFrame) {
- *pFirstPCMFrame = firstPCMFrame;
- }
- if (pLastPCMFrame) {
- *pLastPCMFrame = lastPCMFrame;
- }
-}
-#endif
-
-static drflac_bool32 drflac__seek_to_first_frame(drflac* pFlac)
-{
- drflac_bool32 result;
-
- drflac_assert(pFlac != NULL);
-
- result = drflac__seek_to_byte(&pFlac->bs, pFlac->firstFramePos);
-
- drflac_zero_memory(&pFlac->currentFrame, sizeof(pFlac->currentFrame));
- pFlac->currentSample = 0;
-
- return result;
-}
-
-static DRFLAC_INLINE drflac_result drflac__seek_to_next_flac_frame(drflac* pFlac)
-{
- /* This function should only ever be called while the decoder is sitting on the first byte past the FRAME_HEADER section. */
- drflac_assert(pFlac != NULL);
- return drflac__seek_flac_frame(pFlac);
-}
-
-drflac_uint64 drflac__seek_forward_by_samples(drflac* pFlac, drflac_uint64 samplesToRead)
-{
- drflac_uint64 samplesRead = 0;
- while (samplesToRead > 0) {
- if (pFlac->currentFrame.samplesRemaining == 0) {
- if (!drflac__read_and_decode_next_flac_frame(pFlac)) {
- break; /* Couldn't read the next frame, so just break from the loop and return. */
- }
- } else {
- if (pFlac->currentFrame.samplesRemaining > samplesToRead) {
- samplesRead += samplesToRead;
- pFlac->currentFrame.samplesRemaining -= (drflac_uint32)samplesToRead; /* <-- Safe cast. Will always be < currentFrame.samplesRemaining < 65536. */
- samplesToRead = 0;
- } else {
- samplesRead += pFlac->currentFrame.samplesRemaining;
- samplesToRead -= pFlac->currentFrame.samplesRemaining;
- pFlac->currentFrame.samplesRemaining = 0;
- }
- }
- }
-
- pFlac->currentSample += samplesRead;
- return samplesRead;
-}
-
-drflac_uint64 drflac__seek_forward_by_pcm_frames(drflac* pFlac, drflac_uint64 pcmFramesToSeek)
-{
- return drflac__seek_forward_by_samples(pFlac, pcmFramesToSeek*pFlac->channels);
-}
-
-static drflac_bool32 drflac__seek_to_sample__brute_force(drflac* pFlac, drflac_uint64 sampleIndex)
-{
- drflac_bool32 isMidFrame = DRFLAC_FALSE;
- drflac_uint64 runningSampleCount;
-
- drflac_assert(pFlac != NULL);
-
- /* If we are seeking forward we start from the current position. Otherwise we need to start all the way from the start of the file. */
- if (sampleIndex >= pFlac->currentSample) {
- /* Seeking forward. Need to seek from the current position. */
- runningSampleCount = pFlac->currentSample;
-
- /* The frame header for the first frame may not yet have been read. We need to do that if necessary. */
- if (pFlac->currentSample == 0 && pFlac->currentFrame.samplesRemaining == 0) {
- if (!drflac__read_next_flac_frame_header(&pFlac->bs, pFlac->bitsPerSample, &pFlac->currentFrame.header)) {
- return DRFLAC_FALSE;
- }
- } else {
- isMidFrame = DRFLAC_TRUE;
- }
- } else {
- /* Seeking backwards. Need to seek from the start of the file. */
- runningSampleCount = 0;
-
- /* Move back to the start. */
- if (!drflac__seek_to_first_frame(pFlac)) {
- return DRFLAC_FALSE;
- }
-
- /* Decode the first frame in preparation for sample-exact seeking below. */
- if (!drflac__read_next_flac_frame_header(&pFlac->bs, pFlac->bitsPerSample, &pFlac->currentFrame.header)) {
- return DRFLAC_FALSE;
- }
- }
-
- /*
- We need to as quickly as possible find the frame that contains the target sample. To do this, we iterate over each frame and inspect its
- header. If based on the header we can determine that the frame contains the sample, we do a full decode of that frame.
- */
- for (;;) {
- drflac_uint64 sampleCountInThisFrame;
- drflac_uint64 firstSampleInFrame = 0;
- drflac_uint64 lastSampleInFrame = 0;
-
- drflac__get_current_frame_sample_range(pFlac, &firstSampleInFrame, &lastSampleInFrame);
-
- sampleCountInThisFrame = (lastSampleInFrame - firstSampleInFrame) + 1;
- if (sampleIndex < (runningSampleCount + sampleCountInThisFrame)) {
- /*
- The sample should be in this frame. We need to fully decode it, however if it's an invalid frame (a CRC mismatch), we need to pretend
- it never existed and keep iterating.
- */
- drflac_uint64 samplesToDecode = sampleIndex - runningSampleCount;
-
- if (!isMidFrame) {
- drflac_result result = drflac__decode_flac_frame(pFlac);
- if (result == DRFLAC_SUCCESS) {
- /* The frame is valid. We just need to skip over some samples to ensure it's sample-exact. */
- return drflac__seek_forward_by_samples(pFlac, samplesToDecode) == samplesToDecode; /* <-- If this fails, something bad has happened (it should never fail). */
- } else {
- if (result == DRFLAC_CRC_MISMATCH) {
- goto next_iteration; /* CRC mismatch. Pretend this frame never existed. */
- } else {
- return DRFLAC_FALSE;
- }
- }
- } else {
- /* We started seeking mid-frame which means we need to skip the frame decoding part. */
- return drflac__seek_forward_by_samples(pFlac, samplesToDecode) == samplesToDecode;
- }
- } else {
- /*
- It's not in this frame. We need to seek past the frame, but check if there was a CRC mismatch. If so, we pretend this
- frame never existed and leave the running sample count untouched.
- */
- if (!isMidFrame) {
- drflac_result result = drflac__seek_to_next_flac_frame(pFlac);
- if (result == DRFLAC_SUCCESS) {
- runningSampleCount += sampleCountInThisFrame;
- } else {
- if (result == DRFLAC_CRC_MISMATCH) {
- goto next_iteration; /* CRC mismatch. Pretend this frame never existed. */
- } else {
- return DRFLAC_FALSE;
- }
- }
- } else {
- /*
- We started seeking mid-frame which means we need to seek by reading to the end of the frame instead of with
- drflac__seek_to_next_flac_frame() which only works if the decoder is sitting on the byte just after the frame header.
- */
- runningSampleCount += pFlac->currentFrame.samplesRemaining;
- pFlac->currentFrame.samplesRemaining = 0;
- isMidFrame = DRFLAC_FALSE;
- }
- }
-
- next_iteration:
- /* Grab the next frame in preparation for the next iteration. */
- if (!drflac__read_next_flac_frame_header(&pFlac->bs, pFlac->bitsPerSample, &pFlac->currentFrame.header)) {
- return DRFLAC_FALSE;
- }
- }
-}
-
-
-static drflac_bool32 drflac__seek_to_sample__seek_table(drflac* pFlac, drflac_uint64 sampleIndex)
-{
- drflac_uint32 iClosestSeekpoint = 0;
- drflac_bool32 isMidFrame = DRFLAC_FALSE;
- drflac_uint64 runningSampleCount;
- drflac_uint32 iSeekpoint;
-
- drflac_assert(pFlac != NULL);
-
- if (pFlac->pSeekpoints == NULL || pFlac->seekpointCount == 0) {
- return DRFLAC_FALSE;
- }
-
- for (iSeekpoint = 0; iSeekpoint < pFlac->seekpointCount; ++iSeekpoint) {
- if (pFlac->pSeekpoints[iSeekpoint].firstSample*pFlac->channels >= sampleIndex) {
- break;
- }
-
- iClosestSeekpoint = iSeekpoint;
- }
-
- /*
- At this point we should have found the seekpoint closest to our sample. If we are seeking forward and the closest seekpoint is _before_ the current sample, we
- just seek forward from where we are. Otherwise we start seeking from the seekpoint's first sample.
- */
- if ((sampleIndex >= pFlac->currentSample) && (pFlac->pSeekpoints[iClosestSeekpoint].firstSample*pFlac->channels <= pFlac->currentSample)) {
- /* Optimized case. Just seek forward from where we are. */
- runningSampleCount = pFlac->currentSample;
-
- /* The frame header for the first frame may not yet have been read. We need to do that if necessary. */
- if (pFlac->currentSample == 0 && pFlac->currentFrame.samplesRemaining == 0) {
- if (!drflac__read_next_flac_frame_header(&pFlac->bs, pFlac->bitsPerSample, &pFlac->currentFrame.header)) {
- return DRFLAC_FALSE;
- }
- } else {
- isMidFrame = DRFLAC_TRUE;
- }
- } else {
- /* Slower case. Seek to the start of the seekpoint and then seek forward from there. */
- runningSampleCount = pFlac->pSeekpoints[iClosestSeekpoint].firstSample*pFlac->channels;
-
- if (!drflac__seek_to_byte(&pFlac->bs, pFlac->firstFramePos + pFlac->pSeekpoints[iClosestSeekpoint].frameOffset)) {
- return DRFLAC_FALSE;
- }
-
- /* Grab the frame the seekpoint is sitting on in preparation for the sample-exact seeking below. */
- if (!drflac__read_next_flac_frame_header(&pFlac->bs, pFlac->bitsPerSample, &pFlac->currentFrame.header)) {
- return DRFLAC_FALSE;
- }
- }
-
- for (;;) {
- drflac_uint64 sampleCountInThisFrame;
- drflac_uint64 firstSampleInFrame = 0;
- drflac_uint64 lastSampleInFrame = 0;
- drflac__get_current_frame_sample_range(pFlac, &firstSampleInFrame, &lastSampleInFrame);
-
- sampleCountInThisFrame = (lastSampleInFrame - firstSampleInFrame) + 1;
- if (sampleIndex < (runningSampleCount + sampleCountInThisFrame)) {
- /*
- The sample should be in this frame. We need to fully decode it, but if it's an invalid frame (a CRC mismatch) we need to pretend
- it never existed and keep iterating.
- */
- drflac_uint64 samplesToDecode = sampleIndex - runningSampleCount;
-
- if (!isMidFrame) {
- drflac_result result = drflac__decode_flac_frame(pFlac);
- if (result == DRFLAC_SUCCESS) {
- /* The frame is valid. We just need to skip over some samples to ensure it's sample-exact. */
- return drflac__seek_forward_by_samples(pFlac, samplesToDecode) == samplesToDecode; /* <-- If this fails, something bad has happened (it should never fail). */
- } else {
- if (result == DRFLAC_CRC_MISMATCH) {
- goto next_iteration; /* CRC mismatch. Pretend this frame never existed. */
- } else {
- return DRFLAC_FALSE;
- }
- }
- } else {
- /* We started seeking mid-frame which means we need to skip the frame decoding part. */
- return drflac__seek_forward_by_samples(pFlac, samplesToDecode) == samplesToDecode;
- }
- } else {
- /*
- It's not in this frame. We need to seek past the frame, but check if there was a CRC mismatch. If so, we pretend this
- frame never existed and leave the running sample count untouched.
- */
- if (!isMidFrame) {
- drflac_result result = drflac__seek_to_next_flac_frame(pFlac);
- if (result == DRFLAC_SUCCESS) {
- runningSampleCount += sampleCountInThisFrame;
- } else {
- if (result == DRFLAC_CRC_MISMATCH) {
- goto next_iteration; /* CRC mismatch. Pretend this frame never existed. */
- } else {
- return DRFLAC_FALSE;
- }
- }
- } else {
- /*
- We started seeking mid-frame which means we need to seek by reading to the end of the frame instead of with
- drflac__seek_to_next_flac_frame() which only works if the decoder is sitting on the byte just after the frame header.
- */
- runningSampleCount += pFlac->currentFrame.samplesRemaining;
- pFlac->currentFrame.samplesRemaining = 0;
- isMidFrame = DRFLAC_FALSE;
- }
- }
-
- next_iteration:
- /* Grab the next frame in preparation for the next iteration. */
- if (!drflac__read_next_flac_frame_header(&pFlac->bs, pFlac->bitsPerSample, &pFlac->currentFrame.header)) {
- return DRFLAC_FALSE;
- }
- }
-}
-
-
-#ifndef DR_FLAC_NO_OGG
-typedef struct
-{
- drflac_uint8 capturePattern[4]; /* Should be "OggS" */
- drflac_uint8 structureVersion; /* Always 0. */
- drflac_uint8 headerType;
- drflac_uint64 granulePosition;
- drflac_uint32 serialNumber;
- drflac_uint32 sequenceNumber;
- drflac_uint32 checksum;
- drflac_uint8 segmentCount;
- drflac_uint8 segmentTable[255];
-} drflac_ogg_page_header;
-#endif
-
-typedef struct
-{
- drflac_read_proc onRead;
- drflac_seek_proc onSeek;
- drflac_meta_proc onMeta;
- drflac_container container;
- void* pUserData;
- void* pUserDataMD;
- drflac_uint32 sampleRate;
- drflac_uint8 channels;
- drflac_uint8 bitsPerSample;
- drflac_uint64 totalSampleCount;
- drflac_uint16 maxBlockSize;
- drflac_uint64 runningFilePos;
- drflac_bool32 hasStreamInfoBlock;
- drflac_bool32 hasMetadataBlocks;
- drflac_bs bs; /* <-- A bit streamer is required for loading data during initialization. */
- drflac_frame_header firstFrameHeader; /* <-- The header of the first frame that was read during relaxed initalization. Only set if there is no STREAMINFO block. */
-
-#ifndef DR_FLAC_NO_OGG
- drflac_uint32 oggSerial;
- drflac_uint64 oggFirstBytePos;
- drflac_ogg_page_header oggBosHeader;
-#endif
-} drflac_init_info;
-
-static DRFLAC_INLINE void drflac__decode_block_header(drflac_uint32 blockHeader, drflac_uint8* isLastBlock, drflac_uint8* blockType, drflac_uint32* blockSize)
-{
- blockHeader = drflac__be2host_32(blockHeader);
- *isLastBlock = (blockHeader & 0x80000000UL) >> 31;
- *blockType = (blockHeader & 0x7F000000UL) >> 24;
- *blockSize = (blockHeader & 0x00FFFFFFUL);
-}
-
-static DRFLAC_INLINE drflac_bool32 drflac__read_and_decode_block_header(drflac_read_proc onRead, void* pUserData, drflac_uint8* isLastBlock, drflac_uint8* blockType, drflac_uint32* blockSize)
-{
- drflac_uint32 blockHeader;
- if (onRead(pUserData, &blockHeader, 4) != 4) {
- return DRFLAC_FALSE;
- }
-
- drflac__decode_block_header(blockHeader, isLastBlock, blockType, blockSize);
- return DRFLAC_TRUE;
-}
-
-drflac_bool32 drflac__read_streaminfo(drflac_read_proc onRead, void* pUserData, drflac_streaminfo* pStreamInfo)
-{
- drflac_uint32 blockSizes;
- drflac_uint64 frameSizes = 0;
- drflac_uint64 importantProps;
- drflac_uint8 md5[16];
-
- /* min/max block size. */
- if (onRead(pUserData, &blockSizes, 4) != 4) {
- return DRFLAC_FALSE;
- }
-
- /* min/max frame size. */
- if (onRead(pUserData, &frameSizes, 6) != 6) {
- return DRFLAC_FALSE;
- }
-
- /* Sample rate, channels, bits per sample and total sample count. */
- if (onRead(pUserData, &importantProps, 8) != 8) {
- return DRFLAC_FALSE;
- }
-
- /* MD5 */
- if (onRead(pUserData, md5, sizeof(md5)) != sizeof(md5)) {
- return DRFLAC_FALSE;
- }
-
- blockSizes = drflac__be2host_32(blockSizes);
- frameSizes = drflac__be2host_64(frameSizes);
- importantProps = drflac__be2host_64(importantProps);
-
- pStreamInfo->minBlockSize = (blockSizes & 0xFFFF0000) >> 16;
- pStreamInfo->maxBlockSize = (blockSizes & 0x0000FFFF);
- pStreamInfo->minFrameSize = (drflac_uint32)((frameSizes & (((drflac_uint64)0x00FFFFFF << 16) << 24)) >> 40);
- pStreamInfo->maxFrameSize = (drflac_uint32)((frameSizes & (((drflac_uint64)0x00FFFFFF << 16) << 0)) >> 16);
- pStreamInfo->sampleRate = (drflac_uint32)((importantProps & (((drflac_uint64)0x000FFFFF << 16) << 28)) >> 44);
- pStreamInfo->channels = (drflac_uint8 )((importantProps & (((drflac_uint64)0x0000000E << 16) << 24)) >> 41) + 1;
- pStreamInfo->bitsPerSample = (drflac_uint8 )((importantProps & (((drflac_uint64)0x0000001F << 16) << 20)) >> 36) + 1;
- pStreamInfo->totalSampleCount = ((importantProps & ((((drflac_uint64)0x0000000F << 16) << 16) | 0xFFFFFFFF))) * pStreamInfo->channels;
- drflac_copy_memory(pStreamInfo->md5, md5, sizeof(md5));
-
- return DRFLAC_TRUE;
-}
-
-drflac_bool32 drflac__read_and_decode_metadata(drflac_read_proc onRead, drflac_seek_proc onSeek, drflac_meta_proc onMeta, void* pUserData, void* pUserDataMD, drflac_uint64* pFirstFramePos, drflac_uint64* pSeektablePos, drflac_uint32* pSeektableSize)
-{
- /*
- We want to keep track of the byte position in the stream of the seektable. At the time of calling this function we know that
- we'll be sitting on byte 42.
- */
- drflac_uint64 runningFilePos = 42;
- drflac_uint64 seektablePos = 0;
- drflac_uint32 seektableSize = 0;
-
- for (;;) {
- drflac_metadata metadata;
- drflac_uint8 isLastBlock = 0;
- drflac_uint8 blockType;
- drflac_uint32 blockSize;
- if (!drflac__read_and_decode_block_header(onRead, pUserData, &isLastBlock, &blockType, &blockSize)) {
- return DRFLAC_FALSE;
- }
- runningFilePos += 4;
-
- metadata.type = blockType;
- metadata.pRawData = NULL;
- metadata.rawDataSize = 0;
-
- switch (blockType)
- {
- case DRFLAC_METADATA_BLOCK_TYPE_APPLICATION:
- {
- if (blockSize < 4) {
- return DRFLAC_FALSE;
- }
-
- if (onMeta) {
- void* pRawData = DRFLAC_MALLOC(blockSize);
- if (pRawData == NULL) {
- return DRFLAC_FALSE;
- }
-
- if (onRead(pUserData, pRawData, blockSize) != blockSize) {
- DRFLAC_FREE(pRawData);
- return DRFLAC_FALSE;
- }
-
- metadata.pRawData = pRawData;
- metadata.rawDataSize = blockSize;
- metadata.data.application.id = drflac__be2host_32(*(drflac_uint32*)pRawData);
- metadata.data.application.pData = (const void*)((drflac_uint8*)pRawData + sizeof(drflac_uint32));
- metadata.data.application.dataSize = blockSize - sizeof(drflac_uint32);
- onMeta(pUserDataMD, &metadata);
-
- DRFLAC_FREE(pRawData);
- }
- } break;
-
- case DRFLAC_METADATA_BLOCK_TYPE_SEEKTABLE:
- {
- seektablePos = runningFilePos;
- seektableSize = blockSize;
-
- if (onMeta) {
- drflac_uint32 iSeekpoint;
- void* pRawData;
-
- pRawData = DRFLAC_MALLOC(blockSize);
- if (pRawData == NULL) {
- return DRFLAC_FALSE;
- }
-
- if (onRead(pUserData, pRawData, blockSize) != blockSize) {
- DRFLAC_FREE(pRawData);
- return DRFLAC_FALSE;
- }
-
- metadata.pRawData = pRawData;
- metadata.rawDataSize = blockSize;
- metadata.data.seektable.seekpointCount = blockSize/sizeof(drflac_seekpoint);
- metadata.data.seektable.pSeekpoints = (const drflac_seekpoint*)pRawData;
-
- /* Endian swap. */
- for (iSeekpoint = 0; iSeekpoint < metadata.data.seektable.seekpointCount; ++iSeekpoint) {
- drflac_seekpoint* pSeekpoint = (drflac_seekpoint*)pRawData + iSeekpoint;
- pSeekpoint->firstSample = drflac__be2host_64(pSeekpoint->firstSample);
- pSeekpoint->frameOffset = drflac__be2host_64(pSeekpoint->frameOffset);
- pSeekpoint->sampleCount = drflac__be2host_16(pSeekpoint->sampleCount);
- }
-
- onMeta(pUserDataMD, &metadata);
-
- DRFLAC_FREE(pRawData);
- }
- } break;
-
- case DRFLAC_METADATA_BLOCK_TYPE_VORBIS_COMMENT:
- {
- if (blockSize < 8) {
- return DRFLAC_FALSE;
- }
-
- if (onMeta) {
- void* pRawData;
- const char* pRunningData;
- const char* pRunningDataEnd;
- drflac_uint32 i;
-
- pRawData = DRFLAC_MALLOC(blockSize);
- if (pRawData == NULL) {
- return DRFLAC_FALSE;
- }
-
- if (onRead(pUserData, pRawData, blockSize) != blockSize) {
- DRFLAC_FREE(pRawData);
- return DRFLAC_FALSE;
- }
-
- metadata.pRawData = pRawData;
- metadata.rawDataSize = blockSize;
-
- pRunningData = (const char*)pRawData;
- pRunningDataEnd = (const char*)pRawData + blockSize;
-
- metadata.data.vorbis_comment.vendorLength = drflac__le2host_32(*(const drflac_uint32*)pRunningData); pRunningData += 4;
-
- /* Need space for the rest of the block */
- if ((pRunningDataEnd - pRunningData) - 4 < (drflac_int64)metadata.data.vorbis_comment.vendorLength) { /* <-- Note the order of operations to avoid overflow to a valid value */
- DRFLAC_FREE(pRawData);
- return DRFLAC_FALSE;
- }
- metadata.data.vorbis_comment.vendor = pRunningData; pRunningData += metadata.data.vorbis_comment.vendorLength;
- metadata.data.vorbis_comment.commentCount = drflac__le2host_32(*(const drflac_uint32*)pRunningData); pRunningData += 4;
-
- /* Need space for 'commentCount' comments after the block, which at minimum is a drflac_uint32 per comment */
- if ((pRunningDataEnd - pRunningData) / sizeof(drflac_uint32) < metadata.data.vorbis_comment.commentCount) { /* <-- Note the order of operations to avoid overflow to a valid value */
- DRFLAC_FREE(pRawData);
- return DRFLAC_FALSE;
- }
- metadata.data.vorbis_comment.pComments = pRunningData;
-
- /* Check that the comments section is valid before passing it to the callback */
- for (i = 0; i < metadata.data.vorbis_comment.commentCount; ++i) {
- drflac_uint32 commentLength;
-
- if (pRunningDataEnd - pRunningData < 4) {
- DRFLAC_FREE(pRawData);
- return DRFLAC_FALSE;
- }
-
- commentLength = drflac__le2host_32(*(const drflac_uint32*)pRunningData); pRunningData += 4;
- if (pRunningDataEnd - pRunningData < (drflac_int64)commentLength) { /* <-- Note the order of operations to avoid overflow to a valid value */
- DRFLAC_FREE(pRawData);
- return DRFLAC_FALSE;
- }
- pRunningData += commentLength;
- }
-
- onMeta(pUserDataMD, &metadata);
-
- DRFLAC_FREE(pRawData);
- }
- } break;
-
- case DRFLAC_METADATA_BLOCK_TYPE_CUESHEET:
- {
- if (blockSize < 396) {
- return DRFLAC_FALSE;
- }
-
- if (onMeta) {
- void* pRawData;
- const char* pRunningData;
- const char* pRunningDataEnd;
- drflac_uint8 iTrack;
- drflac_uint8 iIndex;
-
- pRawData = DRFLAC_MALLOC(blockSize);
- if (pRawData == NULL) {
- return DRFLAC_FALSE;
- }
-
- if (onRead(pUserData, pRawData, blockSize) != blockSize) {
- DRFLAC_FREE(pRawData);
- return DRFLAC_FALSE;
- }
-
- metadata.pRawData = pRawData;
- metadata.rawDataSize = blockSize;
-
- pRunningData = (const char*)pRawData;
- pRunningDataEnd = (const char*)pRawData + blockSize;
-
- drflac_copy_memory(metadata.data.cuesheet.catalog, pRunningData, 128); pRunningData += 128;
- metadata.data.cuesheet.leadInSampleCount = drflac__be2host_64(*(const drflac_uint64*)pRunningData); pRunningData += 8;
- metadata.data.cuesheet.isCD = (pRunningData[0] & 0x80) != 0; pRunningData += 259;
- metadata.data.cuesheet.trackCount = pRunningData[0]; pRunningData += 1;
- metadata.data.cuesheet.pTrackData = pRunningData;
-
- /* Check that the cuesheet tracks are valid before passing it to the callback */
- for (iTrack = 0; iTrack < metadata.data.cuesheet.trackCount; ++iTrack) {
- drflac_uint8 indexCount;
- drflac_uint32 indexPointSize;
-
- if (pRunningDataEnd - pRunningData < 36) {
- DRFLAC_FREE(pRawData);
- return DRFLAC_FALSE;
- }
-
- /* Skip to the index point count */
- pRunningData += 35;
- indexCount = pRunningData[0]; pRunningData += 1;
- indexPointSize = indexCount * sizeof(drflac_cuesheet_track_index);
- if (pRunningDataEnd - pRunningData < (drflac_int64)indexPointSize) {
- DRFLAC_FREE(pRawData);
- return DRFLAC_FALSE;
- }
-
- /* Endian swap. */
- for (iIndex = 0; iIndex < indexCount; ++iIndex) {
- drflac_cuesheet_track_index* pTrack = (drflac_cuesheet_track_index*)pRunningData;
- pRunningData += sizeof(drflac_cuesheet_track_index);
- pTrack->offset = drflac__be2host_64(pTrack->offset);
- }
- }
-
- onMeta(pUserDataMD, &metadata);
-
- DRFLAC_FREE(pRawData);
- }
- } break;
-
- case DRFLAC_METADATA_BLOCK_TYPE_PICTURE:
- {
- if (blockSize < 32) {
- return DRFLAC_FALSE;
- }
-
- if (onMeta) {
- void* pRawData;
- const char* pRunningData;
- const char* pRunningDataEnd;
-
- pRawData = DRFLAC_MALLOC(blockSize);
- if (pRawData == NULL) {
- return DRFLAC_FALSE;
- }
-
- if (onRead(pUserData, pRawData, blockSize) != blockSize) {
- DRFLAC_FREE(pRawData);
- return DRFLAC_FALSE;
- }
-
- metadata.pRawData = pRawData;
- metadata.rawDataSize = blockSize;
-
- pRunningData = (const char*)pRawData;
- pRunningDataEnd = (const char*)pRawData + blockSize;
-
- metadata.data.picture.type = drflac__be2host_32(*(const drflac_uint32*)pRunningData); pRunningData += 4;
- metadata.data.picture.mimeLength = drflac__be2host_32(*(const drflac_uint32*)pRunningData); pRunningData += 4;
-
- /* Need space for the rest of the block */
- if ((pRunningDataEnd - pRunningData) - 24 < (drflac_int64)metadata.data.picture.mimeLength) { /* <-- Note the order of operations to avoid overflow to a valid value */
- DRFLAC_FREE(pRawData);
- return DRFLAC_FALSE;
- }
- metadata.data.picture.mime = pRunningData; pRunningData += metadata.data.picture.mimeLength;
- metadata.data.picture.descriptionLength = drflac__be2host_32(*(const drflac_uint32*)pRunningData); pRunningData += 4;
-
- /* Need space for the rest of the block */
- if ((pRunningDataEnd - pRunningData) - 20 < (drflac_int64)metadata.data.picture.descriptionLength) { /* <-- Note the order of operations to avoid overflow to a valid value */
- DRFLAC_FREE(pRawData);
- return DRFLAC_FALSE;
- }
- metadata.data.picture.description = pRunningData; pRunningData += metadata.data.picture.descriptionLength;
- metadata.data.picture.width = drflac__be2host_32(*(const drflac_uint32*)pRunningData); pRunningData += 4;
- metadata.data.picture.height = drflac__be2host_32(*(const drflac_uint32*)pRunningData); pRunningData += 4;
- metadata.data.picture.colorDepth = drflac__be2host_32(*(const drflac_uint32*)pRunningData); pRunningData += 4;
- metadata.data.picture.indexColorCount = drflac__be2host_32(*(const drflac_uint32*)pRunningData); pRunningData += 4;
- metadata.data.picture.pictureDataSize = drflac__be2host_32(*(const drflac_uint32*)pRunningData); pRunningData += 4;
- metadata.data.picture.pPictureData = (const drflac_uint8*)pRunningData;
-
- /* Need space for the picture after the block */
- if (pRunningDataEnd - pRunningData < (drflac_int64)metadata.data.picture.pictureDataSize) { /* <-- Note the order of operations to avoid overflow to a valid value */
- DRFLAC_FREE(pRawData);
- return DRFLAC_FALSE;
- }
-
- onMeta(pUserDataMD, &metadata);
-
- DRFLAC_FREE(pRawData);
- }
- } break;
-
- case DRFLAC_METADATA_BLOCK_TYPE_PADDING:
- {
- if (onMeta) {
- metadata.data.padding.unused = 0;
-
- /* Padding doesn't have anything meaningful in it, so just skip over it, but make sure the caller is aware of it by firing the callback. */
- if (!onSeek(pUserData, blockSize, drflac_seek_origin_current)) {
- isLastBlock = DRFLAC_TRUE; /* An error occurred while seeking. Attempt to recover by treating this as the last block which will in turn terminate the loop. */
- } else {
- onMeta(pUserDataMD, &metadata);
- }
- }
- } break;
-
- case DRFLAC_METADATA_BLOCK_TYPE_INVALID:
- {
- /* Invalid chunk. Just skip over this one. */
- if (onMeta) {
- if (!onSeek(pUserData, blockSize, drflac_seek_origin_current)) {
- isLastBlock = DRFLAC_TRUE; /* An error occurred while seeking. Attempt to recover by treating this as the last block which will in turn terminate the loop. */
- }
- }
- } break;
-
- default:
- {
- /*
- It's an unknown chunk, but not necessarily invalid. There's a chance more metadata blocks might be defined later on, so we
- can at the very least report the chunk to the application and let it look at the raw data.
- */
- if (onMeta) {
- void* pRawData = DRFLAC_MALLOC(blockSize);
- if (pRawData == NULL) {
- return DRFLAC_FALSE;
- }
-
- if (onRead(pUserData, pRawData, blockSize) != blockSize) {
- DRFLAC_FREE(pRawData);
- return DRFLAC_FALSE;
- }
-
- metadata.pRawData = pRawData;
- metadata.rawDataSize = blockSize;
- onMeta(pUserDataMD, &metadata);
-
- DRFLAC_FREE(pRawData);
- }
- } break;
- }
-
- /* If we're not handling metadata, just skip over the block. If we are, it will have been handled earlier in the switch statement above. */
- if (onMeta == NULL && blockSize > 0) {
- if (!onSeek(pUserData, blockSize, drflac_seek_origin_current)) {
- isLastBlock = DRFLAC_TRUE;
- }
- }
-
- runningFilePos += blockSize;
- if (isLastBlock) {
- break;
- }
- }
-
- *pSeektablePos = seektablePos;
- *pSeektableSize = seektableSize;
- *pFirstFramePos = runningFilePos;
-
- return DRFLAC_TRUE;
-}
-
-drflac_bool32 drflac__init_private__native(drflac_init_info* pInit, drflac_read_proc onRead, drflac_seek_proc onSeek, drflac_meta_proc onMeta, void* pUserData, void* pUserDataMD, drflac_bool32 relaxed)
-{
- /* Pre Condition: The bit stream should be sitting just past the 4-byte id header. */
-
- drflac_uint8 isLastBlock;
- drflac_uint8 blockType;
- drflac_uint32 blockSize;
-
- (void)onSeek;
-
- pInit->container = drflac_container_native;
-
- /* The first metadata block should be the STREAMINFO block. */
- if (!drflac__read_and_decode_block_header(onRead, pUserData, &isLastBlock, &blockType, &blockSize)) {
- return DRFLAC_FALSE;
- }
-
- if (blockType != DRFLAC_METADATA_BLOCK_TYPE_STREAMINFO || blockSize != 34) {
- if (!relaxed) {
- /* We're opening in strict mode and the first block is not the STREAMINFO block. Error. */
- return DRFLAC_FALSE;
- } else {
- /*
- Relaxed mode. To open from here we need to just find the first frame and set the sample rate, etc. to whatever is defined
- for that frame.
- */
- pInit->hasStreamInfoBlock = DRFLAC_FALSE;
- pInit->hasMetadataBlocks = DRFLAC_FALSE;
-
- if (!drflac__read_next_flac_frame_header(&pInit->bs, 0, &pInit->firstFrameHeader)) {
- return DRFLAC_FALSE; /* Couldn't find a frame. */
- }
-
- if (pInit->firstFrameHeader.bitsPerSample == 0) {
- return DRFLAC_FALSE; /* Failed to initialize because the first frame depends on the STREAMINFO block, which does not exist. */
- }
-
- pInit->sampleRate = pInit->firstFrameHeader.sampleRate;
- pInit->channels = drflac__get_channel_count_from_channel_assignment(pInit->firstFrameHeader.channelAssignment);
- pInit->bitsPerSample = pInit->firstFrameHeader.bitsPerSample;
- pInit->maxBlockSize = 65535; /* <-- See notes here: https://xiph.org/flac/format.html#metadata_block_streaminfo */
- return DRFLAC_TRUE;
- }
- } else {
- drflac_streaminfo streaminfo;
- if (!drflac__read_streaminfo(onRead, pUserData, &streaminfo)) {
- return DRFLAC_FALSE;
- }
-
- pInit->hasStreamInfoBlock = DRFLAC_TRUE;
- pInit->sampleRate = streaminfo.sampleRate;
- pInit->channels = streaminfo.channels;
- pInit->bitsPerSample = streaminfo.bitsPerSample;
- pInit->totalSampleCount = streaminfo.totalSampleCount;
- pInit->maxBlockSize = streaminfo.maxBlockSize; /* Don't care about the min block size - only the max (used for determining the size of the memory allocation). */
- pInit->hasMetadataBlocks = !isLastBlock;
-
- if (onMeta) {
- drflac_metadata metadata;
- metadata.type = DRFLAC_METADATA_BLOCK_TYPE_STREAMINFO;
- metadata.pRawData = NULL;
- metadata.rawDataSize = 0;
- metadata.data.streaminfo = streaminfo;
- onMeta(pUserDataMD, &metadata);
- }
-
- return DRFLAC_TRUE;
- }
-}
-
-#ifndef DR_FLAC_NO_OGG
-#define DRFLAC_OGG_MAX_PAGE_SIZE 65307
-#define DRFLAC_OGG_CAPTURE_PATTERN_CRC32 1605413199 /* CRC-32 of "OggS". */
-
-typedef enum
-{
- drflac_ogg_recover_on_crc_mismatch,
- drflac_ogg_fail_on_crc_mismatch
-} drflac_ogg_crc_mismatch_recovery;
-
-#ifndef DR_FLAC_NO_CRC
-static drflac_uint32 drflac__crc32_table[] = {
- 0x00000000L, 0x04C11DB7L, 0x09823B6EL, 0x0D4326D9L,
- 0x130476DCL, 0x17C56B6BL, 0x1A864DB2L, 0x1E475005L,
- 0x2608EDB8L, 0x22C9F00FL, 0x2F8AD6D6L, 0x2B4BCB61L,
- 0x350C9B64L, 0x31CD86D3L, 0x3C8EA00AL, 0x384FBDBDL,
- 0x4C11DB70L, 0x48D0C6C7L, 0x4593E01EL, 0x4152FDA9L,
- 0x5F15ADACL, 0x5BD4B01BL, 0x569796C2L, 0x52568B75L,
- 0x6A1936C8L, 0x6ED82B7FL, 0x639B0DA6L, 0x675A1011L,
- 0x791D4014L, 0x7DDC5DA3L, 0x709F7B7AL, 0x745E66CDL,
- 0x9823B6E0L, 0x9CE2AB57L, 0x91A18D8EL, 0x95609039L,
- 0x8B27C03CL, 0x8FE6DD8BL, 0x82A5FB52L, 0x8664E6E5L,
- 0xBE2B5B58L, 0xBAEA46EFL, 0xB7A96036L, 0xB3687D81L,
- 0xAD2F2D84L, 0xA9EE3033L, 0xA4AD16EAL, 0xA06C0B5DL,
- 0xD4326D90L, 0xD0F37027L, 0xDDB056FEL, 0xD9714B49L,
- 0xC7361B4CL, 0xC3F706FBL, 0xCEB42022L, 0xCA753D95L,
- 0xF23A8028L, 0xF6FB9D9FL, 0xFBB8BB46L, 0xFF79A6F1L,
- 0xE13EF6F4L, 0xE5FFEB43L, 0xE8BCCD9AL, 0xEC7DD02DL,
- 0x34867077L, 0x30476DC0L, 0x3D044B19L, 0x39C556AEL,
- 0x278206ABL, 0x23431B1CL, 0x2E003DC5L, 0x2AC12072L,
- 0x128E9DCFL, 0x164F8078L, 0x1B0CA6A1L, 0x1FCDBB16L,
- 0x018AEB13L, 0x054BF6A4L, 0x0808D07DL, 0x0CC9CDCAL,
- 0x7897AB07L, 0x7C56B6B0L, 0x71159069L, 0x75D48DDEL,
- 0x6B93DDDBL, 0x6F52C06CL, 0x6211E6B5L, 0x66D0FB02L,
- 0x5E9F46BFL, 0x5A5E5B08L, 0x571D7DD1L, 0x53DC6066L,
- 0x4D9B3063L, 0x495A2DD4L, 0x44190B0DL, 0x40D816BAL,
- 0xACA5C697L, 0xA864DB20L, 0xA527FDF9L, 0xA1E6E04EL,
- 0xBFA1B04BL, 0xBB60ADFCL, 0xB6238B25L, 0xB2E29692L,
- 0x8AAD2B2FL, 0x8E6C3698L, 0x832F1041L, 0x87EE0DF6L,
- 0x99A95DF3L, 0x9D684044L, 0x902B669DL, 0x94EA7B2AL,
- 0xE0B41DE7L, 0xE4750050L, 0xE9362689L, 0xEDF73B3EL,
- 0xF3B06B3BL, 0xF771768CL, 0xFA325055L, 0xFEF34DE2L,
- 0xC6BCF05FL, 0xC27DEDE8L, 0xCF3ECB31L, 0xCBFFD686L,
- 0xD5B88683L, 0xD1799B34L, 0xDC3ABDEDL, 0xD8FBA05AL,
- 0x690CE0EEL, 0x6DCDFD59L, 0x608EDB80L, 0x644FC637L,
- 0x7A089632L, 0x7EC98B85L, 0x738AAD5CL, 0x774BB0EBL,
- 0x4F040D56L, 0x4BC510E1L, 0x46863638L, 0x42472B8FL,
- 0x5C007B8AL, 0x58C1663DL, 0x558240E4L, 0x51435D53L,
- 0x251D3B9EL, 0x21DC2629L, 0x2C9F00F0L, 0x285E1D47L,
- 0x36194D42L, 0x32D850F5L, 0x3F9B762CL, 0x3B5A6B9BL,
- 0x0315D626L, 0x07D4CB91L, 0x0A97ED48L, 0x0E56F0FFL,
- 0x1011A0FAL, 0x14D0BD4DL, 0x19939B94L, 0x1D528623L,
- 0xF12F560EL, 0xF5EE4BB9L, 0xF8AD6D60L, 0xFC6C70D7L,
- 0xE22B20D2L, 0xE6EA3D65L, 0xEBA91BBCL, 0xEF68060BL,
- 0xD727BBB6L, 0xD3E6A601L, 0xDEA580D8L, 0xDA649D6FL,
- 0xC423CD6AL, 0xC0E2D0DDL, 0xCDA1F604L, 0xC960EBB3L,
- 0xBD3E8D7EL, 0xB9FF90C9L, 0xB4BCB610L, 0xB07DABA7L,
- 0xAE3AFBA2L, 0xAAFBE615L, 0xA7B8C0CCL, 0xA379DD7BL,
- 0x9B3660C6L, 0x9FF77D71L, 0x92B45BA8L, 0x9675461FL,
- 0x8832161AL, 0x8CF30BADL, 0x81B02D74L, 0x857130C3L,
- 0x5D8A9099L, 0x594B8D2EL, 0x5408ABF7L, 0x50C9B640L,
- 0x4E8EE645L, 0x4A4FFBF2L, 0x470CDD2BL, 0x43CDC09CL,
- 0x7B827D21L, 0x7F436096L, 0x7200464FL, 0x76C15BF8L,
- 0x68860BFDL, 0x6C47164AL, 0x61043093L, 0x65C52D24L,
- 0x119B4BE9L, 0x155A565EL, 0x18197087L, 0x1CD86D30L,
- 0x029F3D35L, 0x065E2082L, 0x0B1D065BL, 0x0FDC1BECL,
- 0x3793A651L, 0x3352BBE6L, 0x3E119D3FL, 0x3AD08088L,
- 0x2497D08DL, 0x2056CD3AL, 0x2D15EBE3L, 0x29D4F654L,
- 0xC5A92679L, 0xC1683BCEL, 0xCC2B1D17L, 0xC8EA00A0L,
- 0xD6AD50A5L, 0xD26C4D12L, 0xDF2F6BCBL, 0xDBEE767CL,
- 0xE3A1CBC1L, 0xE760D676L, 0xEA23F0AFL, 0xEEE2ED18L,
- 0xF0A5BD1DL, 0xF464A0AAL, 0xF9278673L, 0xFDE69BC4L,
- 0x89B8FD09L, 0x8D79E0BEL, 0x803AC667L, 0x84FBDBD0L,
- 0x9ABC8BD5L, 0x9E7D9662L, 0x933EB0BBL, 0x97FFAD0CL,
- 0xAFB010B1L, 0xAB710D06L, 0xA6322BDFL, 0xA2F33668L,
- 0xBCB4666DL, 0xB8757BDAL, 0xB5365D03L, 0xB1F740B4L
-};
-#endif
-
-static DRFLAC_INLINE drflac_uint32 drflac_crc32_byte(drflac_uint32 crc32, drflac_uint8 data)
-{
-#ifndef DR_FLAC_NO_CRC
- return (crc32 << 8) ^ drflac__crc32_table[(drflac_uint8)((crc32 >> 24) & 0xFF) ^ data];
-#else
- (void)data;
- return crc32;
-#endif
-}
-
-#if 0
-static DRFLAC_INLINE drflac_uint32 drflac_crc32_uint32(drflac_uint32 crc32, drflac_uint32 data)
-{
- crc32 = drflac_crc32_byte(crc32, (drflac_uint8)((data >> 24) & 0xFF));
- crc32 = drflac_crc32_byte(crc32, (drflac_uint8)((data >> 16) & 0xFF));
- crc32 = drflac_crc32_byte(crc32, (drflac_uint8)((data >> 8) & 0xFF));
- crc32 = drflac_crc32_byte(crc32, (drflac_uint8)((data >> 0) & 0xFF));
- return crc32;
-}
-
-static DRFLAC_INLINE drflac_uint32 drflac_crc32_uint64(drflac_uint32 crc32, drflac_uint64 data)
-{
- crc32 = drflac_crc32_uint32(crc32, (drflac_uint32)((data >> 32) & 0xFFFFFFFF));
- crc32 = drflac_crc32_uint32(crc32, (drflac_uint32)((data >> 0) & 0xFFFFFFFF));
- return crc32;
-}
-#endif
-
-static DRFLAC_INLINE drflac_uint32 drflac_crc32_buffer(drflac_uint32 crc32, drflac_uint8* pData, drflac_uint32 dataSize)
-{
- /* This can be optimized. */
- drflac_uint32 i;
- for (i = 0; i < dataSize; ++i) {
- crc32 = drflac_crc32_byte(crc32, pData[i]);
- }
- return crc32;
-}
-
-
-static DRFLAC_INLINE drflac_bool32 drflac_ogg__is_capture_pattern(drflac_uint8 pattern[4])
-{
- return pattern[0] == 'O' && pattern[1] == 'g' && pattern[2] == 'g' && pattern[3] == 'S';
-}
-
-static DRFLAC_INLINE drflac_uint32 drflac_ogg__get_page_header_size(drflac_ogg_page_header* pHeader)
-{
- return 27 + pHeader->segmentCount;
-}
-
-static DRFLAC_INLINE drflac_uint32 drflac_ogg__get_page_body_size(drflac_ogg_page_header* pHeader)
-{
- drflac_uint32 pageBodySize = 0;
- int i;
-
- for (i = 0; i < pHeader->segmentCount; ++i) {
- pageBodySize += pHeader->segmentTable[i];
- }
-
- return pageBodySize;
-}
-
-drflac_result drflac_ogg__read_page_header_after_capture_pattern(drflac_read_proc onRead, void* pUserData, drflac_ogg_page_header* pHeader, drflac_uint32* pBytesRead, drflac_uint32* pCRC32)
-{
- drflac_uint8 data[23];
- drflac_uint32 i;
-
- drflac_assert(*pCRC32 == DRFLAC_OGG_CAPTURE_PATTERN_CRC32);
-
- if (onRead(pUserData, data, 23) != 23) {
- return DRFLAC_END_OF_STREAM;
- }
- *pBytesRead += 23;
-
- pHeader->structureVersion = data[0];
- pHeader->headerType = data[1];
- drflac_copy_memory(&pHeader->granulePosition, &data[ 2], 8);
- drflac_copy_memory(&pHeader->serialNumber, &data[10], 4);
- drflac_copy_memory(&pHeader->sequenceNumber, &data[14], 4);
- drflac_copy_memory(&pHeader->checksum, &data[18], 4);
- pHeader->segmentCount = data[22];
-
- /* Calculate the CRC. Note that for the calculation the checksum part of the page needs to be set to 0. */
- data[18] = 0;
- data[19] = 0;
- data[20] = 0;
- data[21] = 0;
-
- for (i = 0; i < 23; ++i) {
- *pCRC32 = drflac_crc32_byte(*pCRC32, data[i]);
- }
-
-
- if (onRead(pUserData, pHeader->segmentTable, pHeader->segmentCount) != pHeader->segmentCount) {
- return DRFLAC_END_OF_STREAM;
- }
- *pBytesRead += pHeader->segmentCount;
-
- for (i = 0; i < pHeader->segmentCount; ++i) {
- *pCRC32 = drflac_crc32_byte(*pCRC32, pHeader->segmentTable[i]);
- }
-
- return DRFLAC_SUCCESS;
-}
-
-drflac_result drflac_ogg__read_page_header(drflac_read_proc onRead, void* pUserData, drflac_ogg_page_header* pHeader, drflac_uint32* pBytesRead, drflac_uint32* pCRC32)
-{
- drflac_uint8 id[4];
-
- *pBytesRead = 0;
-
- if (onRead(pUserData, id, 4) != 4) {
- return DRFLAC_END_OF_STREAM;
- }
- *pBytesRead += 4;
-
- /* We need to read byte-by-byte until we find the OggS capture pattern. */
- for (;;) {
- if (drflac_ogg__is_capture_pattern(id)) {
- drflac_result result;
-
- *pCRC32 = DRFLAC_OGG_CAPTURE_PATTERN_CRC32;
-
- result = drflac_ogg__read_page_header_after_capture_pattern(onRead, pUserData, pHeader, pBytesRead, pCRC32);
- if (result == DRFLAC_SUCCESS) {
- return DRFLAC_SUCCESS;
- } else {
- if (result == DRFLAC_CRC_MISMATCH) {
- continue;
- } else {
- return result;
- }
- }
- } else {
- /* The first 4 bytes did not equal the capture pattern. Read the next byte and try again. */
- id[0] = id[1];
- id[1] = id[2];
- id[2] = id[3];
- if (onRead(pUserData, &id[3], 1) != 1) {
- return DRFLAC_END_OF_STREAM;
- }
- *pBytesRead += 1;
- }
- }
-}
-
-
-/*
-The main part of the Ogg encapsulation is the conversion from the physical Ogg bitstream to the native FLAC bitstream. It works
-in three general stages: Ogg Physical Bitstream -> Ogg/FLAC Logical Bitstream -> FLAC Native Bitstream. dr_flac is designed
-in such a way that the core sections assume everything is delivered in native format. Therefore, for each encapsulation type
-dr_flac is supporting there needs to be a layer sitting on top of the onRead and onSeek callbacks that ensures the bits read from
-the physical Ogg bitstream are converted and delivered in native FLAC format.
-*/
-typedef struct
-{
- drflac_read_proc onRead; /* The original onRead callback from drflac_open() and family. */
- drflac_seek_proc onSeek; /* The original onSeek callback from drflac_open() and family. */
- void* pUserData; /* The user data passed on onRead and onSeek. This is the user data that was passed on drflac_open() and family. */
- drflac_uint64 currentBytePos; /* The position of the byte we are sitting on in the physical byte stream. Used for efficient seeking. */
- drflac_uint64 firstBytePos; /* The position of the first byte in the physical bitstream. Points to the start of the "OggS" identifier of the FLAC bos page. */
- drflac_uint32 serialNumber; /* The serial number of the FLAC audio pages. This is determined by the initial header page that was read during initialization. */
- drflac_ogg_page_header bosPageHeader; /* Used for seeking. */
- drflac_ogg_page_header currentPageHeader;
- drflac_uint32 bytesRemainingInPage;
- drflac_uint32 pageDataSize;
- drflac_uint8 pageData[DRFLAC_OGG_MAX_PAGE_SIZE];
-} drflac_oggbs; /* oggbs = Ogg Bitstream */
-
-static size_t drflac_oggbs__read_physical(drflac_oggbs* oggbs, void* bufferOut, size_t bytesToRead)
-{
- size_t bytesActuallyRead = oggbs->onRead(oggbs->pUserData, bufferOut, bytesToRead);
- oggbs->currentBytePos += bytesActuallyRead;
-
- return bytesActuallyRead;
-}
-
-static drflac_bool32 drflac_oggbs__seek_physical(drflac_oggbs* oggbs, drflac_uint64 offset, drflac_seek_origin origin)
-{
- if (origin == drflac_seek_origin_start) {
- if (offset <= 0x7FFFFFFF) {
- if (!oggbs->onSeek(oggbs->pUserData, (int)offset, drflac_seek_origin_start)) {
- return DRFLAC_FALSE;
- }
- oggbs->currentBytePos = offset;
-
- return DRFLAC_TRUE;
- } else {
- if (!oggbs->onSeek(oggbs->pUserData, 0x7FFFFFFF, drflac_seek_origin_start)) {
- return DRFLAC_FALSE;
- }
- oggbs->currentBytePos = offset;
-
- return drflac_oggbs__seek_physical(oggbs, offset - 0x7FFFFFFF, drflac_seek_origin_current);
- }
- } else {
- while (offset > 0x7FFFFFFF) {
- if (!oggbs->onSeek(oggbs->pUserData, 0x7FFFFFFF, drflac_seek_origin_current)) {
- return DRFLAC_FALSE;
- }
- oggbs->currentBytePos += 0x7FFFFFFF;
- offset -= 0x7FFFFFFF;
- }
-
- if (!oggbs->onSeek(oggbs->pUserData, (int)offset, drflac_seek_origin_current)) { /* <-- Safe cast thanks to the loop above. */
- return DRFLAC_FALSE;
- }
- oggbs->currentBytePos += offset;
-
- return DRFLAC_TRUE;
- }
-}
-
-static drflac_bool32 drflac_oggbs__goto_next_page(drflac_oggbs* oggbs, drflac_ogg_crc_mismatch_recovery recoveryMethod)
-{
- drflac_ogg_page_header header;
- for (;;) {
- drflac_uint32 crc32 = 0;
- drflac_uint32 bytesRead;
- drflac_uint32 pageBodySize;
-#ifndef DR_FLAC_NO_CRC
- drflac_uint32 actualCRC32;
-#endif
-
- if (drflac_ogg__read_page_header(oggbs->onRead, oggbs->pUserData, &header, &bytesRead, &crc32) != DRFLAC_SUCCESS) {
- return DRFLAC_FALSE;
- }
- oggbs->currentBytePos += bytesRead;
-
- pageBodySize = drflac_ogg__get_page_body_size(&header);
- if (pageBodySize > DRFLAC_OGG_MAX_PAGE_SIZE) {
- continue; /* Invalid page size. Assume it's corrupted and just move to the next page. */
- }
-
- if (header.serialNumber != oggbs->serialNumber) {
- /* It's not a FLAC page. Skip it. */
- if (pageBodySize > 0 && !drflac_oggbs__seek_physical(oggbs, pageBodySize, drflac_seek_origin_current)) {
- return DRFLAC_FALSE;
- }
- continue;
- }
-
-
- /* We need to read the entire page and then do a CRC check on it. If there's a CRC mismatch we need to skip this page. */
- if (drflac_oggbs__read_physical(oggbs, oggbs->pageData, pageBodySize) != pageBodySize) {
- return DRFLAC_FALSE;
- }
- oggbs->pageDataSize = pageBodySize;
-
-#ifndef DR_FLAC_NO_CRC
- actualCRC32 = drflac_crc32_buffer(crc32, oggbs->pageData, oggbs->pageDataSize);
- if (actualCRC32 != header.checksum) {
- if (recoveryMethod == drflac_ogg_recover_on_crc_mismatch) {
- continue; /* CRC mismatch. Skip this page. */
- } else {
- /*
- Even though we are failing on a CRC mismatch, we still want our stream to be in a good state. Therefore we
- go to the next valid page to ensure we're in a good state, but return false to let the caller know that the
- seek did not fully complete.
- */
- drflac_oggbs__goto_next_page(oggbs, drflac_ogg_recover_on_crc_mismatch);
- return DRFLAC_FALSE;
- }
- }
-#else
- (void)recoveryMethod; /* <-- Silence a warning. */
-#endif
-
- oggbs->currentPageHeader = header;
- oggbs->bytesRemainingInPage = pageBodySize;
- return DRFLAC_TRUE;
- }
-}
-
-/* Function below is unused at the moment, but I might be re-adding it later. */
-#if 0
-static drflac_uint8 drflac_oggbs__get_current_segment_index(drflac_oggbs* oggbs, drflac_uint8* pBytesRemainingInSeg)
-{
- drflac_uint32 bytesConsumedInPage = drflac_ogg__get_page_body_size(&oggbs->currentPageHeader) - oggbs->bytesRemainingInPage;
- drflac_uint8 iSeg = 0;
- drflac_uint32 iByte = 0;
- while (iByte < bytesConsumedInPage) {
- drflac_uint8 segmentSize = oggbs->currentPageHeader.segmentTable[iSeg];
- if (iByte + segmentSize > bytesConsumedInPage) {
- break;
- } else {
- iSeg += 1;
- iByte += segmentSize;
- }
- }
-
- *pBytesRemainingInSeg = oggbs->currentPageHeader.segmentTable[iSeg] - (drflac_uint8)(bytesConsumedInPage - iByte);
- return iSeg;
-}
-
-static drflac_bool32 drflac_oggbs__seek_to_next_packet(drflac_oggbs* oggbs)
-{
- /* The current packet ends when we get to the segment with a lacing value of < 255 which is not at the end of a page. */
- for (;;) {
- drflac_bool32 atEndOfPage = DRFLAC_FALSE;
-
- drflac_uint8 bytesRemainingInSeg;
- drflac_uint8 iFirstSeg = drflac_oggbs__get_current_segment_index(oggbs, &bytesRemainingInSeg);
-
- drflac_uint32 bytesToEndOfPacketOrPage = bytesRemainingInSeg;
- for (drflac_uint8 iSeg = iFirstSeg; iSeg < oggbs->currentPageHeader.segmentCount; ++iSeg) {
- drflac_uint8 segmentSize = oggbs->currentPageHeader.segmentTable[iSeg];
- if (segmentSize < 255) {
- if (iSeg == oggbs->currentPageHeader.segmentCount-1) {
- atEndOfPage = DRFLAC_TRUE;
- }
-
- break;
- }
-
- bytesToEndOfPacketOrPage += segmentSize;
- }
-
- /*
- At this point we will have found either the packet or the end of the page. If were at the end of the page we'll
- want to load the next page and keep searching for the end of the packet.
- */
- drflac_oggbs__seek_physical(oggbs, bytesToEndOfPacketOrPage, drflac_seek_origin_current);
- oggbs->bytesRemainingInPage -= bytesToEndOfPacketOrPage;
-
- if (atEndOfPage) {
- /*
- We're potentially at the next packet, but we need to check the next page first to be sure because the packet may
- straddle pages.
- */
- if (!drflac_oggbs__goto_next_page(oggbs)) {
- return DRFLAC_FALSE;
- }
-
- /* If it's a fresh packet it most likely means we're at the next packet. */
- if ((oggbs->currentPageHeader.headerType & 0x01) == 0) {
- return DRFLAC_TRUE;
- }
- } else {
- /* We're at the next packet. */
- return DRFLAC_TRUE;
- }
- }
-}
-
-static drflac_bool32 drflac_oggbs__seek_to_next_frame(drflac_oggbs* oggbs)
-{
- /* The bitstream should be sitting on the first byte just after the header of the frame. */
-
- /* What we're actually doing here is seeking to the start of the next packet. */
- return drflac_oggbs__seek_to_next_packet(oggbs);
-}
-#endif
-
-static size_t drflac__on_read_ogg(void* pUserData, void* bufferOut, size_t bytesToRead)
-{
- drflac_oggbs* oggbs = (drflac_oggbs*)pUserData;
- drflac_uint8* pRunningBufferOut = (drflac_uint8*)bufferOut;
- size_t bytesRead = 0;
-
- drflac_assert(oggbs != NULL);
- drflac_assert(pRunningBufferOut != NULL);
-
- /* Reading is done page-by-page. If we've run out of bytes in the page we need to move to the next one. */
- while (bytesRead < bytesToRead) {
- size_t bytesRemainingToRead = bytesToRead - bytesRead;
-
- if (oggbs->bytesRemainingInPage >= bytesRemainingToRead) {
- drflac_copy_memory(pRunningBufferOut, oggbs->pageData + (oggbs->pageDataSize - oggbs->bytesRemainingInPage), bytesRemainingToRead);
- bytesRead += bytesRemainingToRead;
- oggbs->bytesRemainingInPage -= (drflac_uint32)bytesRemainingToRead;
- break;
- }
-
- /* If we get here it means some of the requested data is contained in the next pages. */
- if (oggbs->bytesRemainingInPage > 0) {
- drflac_copy_memory(pRunningBufferOut, oggbs->pageData + (oggbs->pageDataSize - oggbs->bytesRemainingInPage), oggbs->bytesRemainingInPage);
- bytesRead += oggbs->bytesRemainingInPage;
- pRunningBufferOut += oggbs->bytesRemainingInPage;
- oggbs->bytesRemainingInPage = 0;
- }
-
- drflac_assert(bytesRemainingToRead > 0);
- if (!drflac_oggbs__goto_next_page(oggbs, drflac_ogg_recover_on_crc_mismatch)) {
- break; /* Failed to go to the next page. Might have simply hit the end of the stream. */
- }
- }
-
- return bytesRead;
-}
-
-static drflac_bool32 drflac__on_seek_ogg(void* pUserData, int offset, drflac_seek_origin origin)
-{
- drflac_oggbs* oggbs = (drflac_oggbs*)pUserData;
- int bytesSeeked = 0;
-
- drflac_assert(oggbs != NULL);
- drflac_assert(offset >= 0); /* <-- Never seek backwards. */
-
- /* Seeking is always forward which makes things a lot simpler. */
- if (origin == drflac_seek_origin_start) {
- if (!drflac_oggbs__seek_physical(oggbs, (int)oggbs->firstBytePos, drflac_seek_origin_start)) {
- return DRFLAC_FALSE;
- }
-
- if (!drflac_oggbs__goto_next_page(oggbs, drflac_ogg_fail_on_crc_mismatch)) {
- return DRFLAC_FALSE;
- }
-
- return drflac__on_seek_ogg(pUserData, offset, drflac_seek_origin_current);
- }
-
- drflac_assert(origin == drflac_seek_origin_current);
-
- while (bytesSeeked < offset) {
- int bytesRemainingToSeek = offset - bytesSeeked;
- drflac_assert(bytesRemainingToSeek >= 0);
-
- if (oggbs->bytesRemainingInPage >= (size_t)bytesRemainingToSeek) {
- bytesSeeked += bytesRemainingToSeek;
- oggbs->bytesRemainingInPage -= bytesRemainingToSeek;
- break;
- }
-
- /* If we get here it means some of the requested data is contained in the next pages. */
- if (oggbs->bytesRemainingInPage > 0) {
- bytesSeeked += (int)oggbs->bytesRemainingInPage;
- oggbs->bytesRemainingInPage = 0;
- }
-
- drflac_assert(bytesRemainingToSeek > 0);
- if (!drflac_oggbs__goto_next_page(oggbs, drflac_ogg_fail_on_crc_mismatch)) {
- /* Failed to go to the next page. We either hit the end of the stream or had a CRC mismatch. */
- return DRFLAC_FALSE;
- }
- }
-
- return DRFLAC_TRUE;
-}
-
-drflac_bool32 drflac_ogg__seek_to_sample(drflac* pFlac, drflac_uint64 sampleIndex)
-{
- drflac_oggbs* oggbs = (drflac_oggbs*)pFlac->_oggbs;
- drflac_uint64 originalBytePos;
- drflac_uint64 runningGranulePosition;
- drflac_uint64 runningFrameBytePos;
- drflac_uint64 runningSampleCount;
-
- drflac_assert(oggbs != NULL);
-
- originalBytePos = oggbs->currentBytePos; /* For recovery. */
-
- /* First seek to the first frame. */
- if (!drflac__seek_to_byte(&pFlac->bs, pFlac->firstFramePos)) {
- return DRFLAC_FALSE;
- }
- oggbs->bytesRemainingInPage = 0;
-
- runningGranulePosition = 0;
- runningFrameBytePos = oggbs->currentBytePos; /* <-- Points to the OggS identifier. */
- for (;;) {
- if (!drflac_oggbs__goto_next_page(oggbs, drflac_ogg_recover_on_crc_mismatch)) {
- drflac_oggbs__seek_physical(oggbs, originalBytePos, drflac_seek_origin_start);
- return DRFLAC_FALSE; /* Never did find that sample... */
- }
-
- runningFrameBytePos = oggbs->currentBytePos - drflac_ogg__get_page_header_size(&oggbs->currentPageHeader) - oggbs->pageDataSize;
- if (oggbs->currentPageHeader.granulePosition*pFlac->channels >= sampleIndex) {
- break; /* The sample is somewhere in the previous page. */
- }
-
- /*
- At this point we know the sample is not in the previous page. It could possibly be in this page. For simplicity we
- disregard any pages that do not begin a fresh packet.
- */
- if ((oggbs->currentPageHeader.headerType & 0x01) == 0) { /* <-- Is it a fresh page? */
- if (oggbs->currentPageHeader.segmentTable[0] >= 2) {
- drflac_uint8 firstBytesInPage[2];
- firstBytesInPage[0] = oggbs->pageData[0];
- firstBytesInPage[1] = oggbs->pageData[1];
-
- if ((firstBytesInPage[0] == 0xFF) && (firstBytesInPage[1] & 0xFC) == 0xF8) { /* <-- Does the page begin with a frame's sync code? */
- runningGranulePosition = oggbs->currentPageHeader.granulePosition*pFlac->channels;
- }
-
- continue;
- }
- }
- }
-
- /*
- We found the page that that is closest to the sample, so now we need to find it. The first thing to do is seek to the
- start of that page. In the loop above we checked that it was a fresh page which means this page is also the start of
- a new frame. This property means that after we've seeked to the page we can immediately start looping over frames until
- we find the one containing the target sample.
- */
- if (!drflac_oggbs__seek_physical(oggbs, runningFrameBytePos, drflac_seek_origin_start)) {
- return DRFLAC_FALSE;
- }
- if (!drflac_oggbs__goto_next_page(oggbs, drflac_ogg_recover_on_crc_mismatch)) {
- return DRFLAC_FALSE;
- }
-
- /*
- At this point we'll be sitting on the first byte of the frame header of the first frame in the page. We just keep
- looping over these frames until we find the one containing the sample we're after.
- */
- runningSampleCount = runningGranulePosition;
- for (;;) {
- /*
- There are two ways to find the sample and seek past irrelevant frames:
- 1) Use the native FLAC decoder.
- 2) Use Ogg's framing system.
-
- Both of these options have their own pros and cons. Using the native FLAC decoder is slower because it needs to
- do a full decode of the frame. Using Ogg's framing system is faster, but more complicated and involves some code
- duplication for the decoding of frame headers.
-
- Another thing to consider is that using the Ogg framing system will perform direct seeking of the physical Ogg
- bitstream. This is important to consider because it means we cannot read data from the drflac_bs object using the
- standard drflac__*() APIs because that will read in extra data for its own internal caching which in turn breaks
- the positioning of the read pointer of the physical Ogg bitstream. Therefore, anything that would normally be read
- using the native FLAC decoding APIs, such as drflac__read_next_flac_frame_header(), need to be re-implemented so as to
- avoid the use of the drflac_bs object.
-
- Considering these issues, I have decided to use the slower native FLAC decoding method for the following reasons:
- 1) Seeking is already partially accelerated using Ogg's paging system in the code block above.
- 2) Seeking in an Ogg encapsulated FLAC stream is probably quite uncommon.
- 3) Simplicity.
- */
- drflac_uint64 firstSampleInFrame = 0;
- drflac_uint64 lastSampleInFrame = 0;
- drflac_uint64 sampleCountInThisFrame;
-
- if (!drflac__read_next_flac_frame_header(&pFlac->bs, pFlac->bitsPerSample, &pFlac->currentFrame.header)) {
- return DRFLAC_FALSE;
- }
-
- drflac__get_current_frame_sample_range(pFlac, &firstSampleInFrame, &lastSampleInFrame);
-
- sampleCountInThisFrame = (lastSampleInFrame - firstSampleInFrame) + 1;
- if (sampleIndex < (runningSampleCount + sampleCountInThisFrame)) {
- /*
- The sample should be in this frame. We need to fully decode it, however if it's an invalid frame (a CRC mismatch), we need to pretend
- it never existed and keep iterating.
- */
- drflac_result result = drflac__decode_flac_frame(pFlac);
- if (result == DRFLAC_SUCCESS) {
- /* The frame is valid. We just need to skip over some samples to ensure it's sample-exact. */
- drflac_uint64 samplesToDecode = (size_t)(sampleIndex - runningSampleCount); /* <-- Safe cast because the maximum number of samples in a frame is 65535. */
- if (samplesToDecode == 0) {
- return DRFLAC_TRUE;
- }
- return drflac__seek_forward_by_samples(pFlac, samplesToDecode) == samplesToDecode; /* <-- If this fails, something bad has happened (it should never fail). */
- } else {
- if (result == DRFLAC_CRC_MISMATCH) {
- continue; /* CRC mismatch. Pretend this frame never existed. */
- } else {
- return DRFLAC_FALSE;
- }
- }
- } else {
- /*
- It's not in this frame. We need to seek past the frame, but check if there was a CRC mismatch. If so, we pretend this
- frame never existed and leave the running sample count untouched.
- */
- drflac_result result = drflac__seek_to_next_flac_frame(pFlac);
- if (result == DRFLAC_SUCCESS) {
- runningSampleCount += sampleCountInThisFrame;
- } else {
- if (result == DRFLAC_CRC_MISMATCH) {
- continue; /* CRC mismatch. Pretend this frame never existed. */
- } else {
- return DRFLAC_FALSE;
- }
- }
- }
- }
-}
-
-
-drflac_bool32 drflac__init_private__ogg(drflac_init_info* pInit, drflac_read_proc onRead, drflac_seek_proc onSeek, drflac_meta_proc onMeta, void* pUserData, void* pUserDataMD, drflac_bool32 relaxed)
-{
- drflac_ogg_page_header header;
- drflac_uint32 crc32 = DRFLAC_OGG_CAPTURE_PATTERN_CRC32;
- drflac_uint32 bytesRead = 0;
-
- /* Pre Condition: The bit stream should be sitting just past the 4-byte OggS capture pattern. */
- (void)relaxed;
-
- pInit->container = drflac_container_ogg;
- pInit->oggFirstBytePos = 0;
-
- /*
- We'll get here if the first 4 bytes of the stream were the OggS capture pattern, however it doesn't necessarily mean the
- stream includes FLAC encoded audio. To check for this we need to scan the beginning-of-stream page markers and check if
- any match the FLAC specification. Important to keep in mind that the stream may be multiplexed.
- */
- if (drflac_ogg__read_page_header_after_capture_pattern(onRead, pUserData, &header, &bytesRead, &crc32) != DRFLAC_SUCCESS) {
- return DRFLAC_FALSE;
- }
- pInit->runningFilePos += bytesRead;
-
- for (;;) {
- int pageBodySize;
-
- /* Break if we're past the beginning of stream page. */
- if ((header.headerType & 0x02) == 0) {
- return DRFLAC_FALSE;
- }
-
- /* Check if it's a FLAC header. */
- pageBodySize = drflac_ogg__get_page_body_size(&header);
- if (pageBodySize == 51) { /* 51 = the lacing value of the FLAC header packet. */
- /* It could be a FLAC page... */
- drflac_uint32 bytesRemainingInPage = pageBodySize;
- drflac_uint8 packetType;
-
- if (onRead(pUserData, &packetType, 1) != 1) {
- return DRFLAC_FALSE;
- }
-
- bytesRemainingInPage -= 1;
- if (packetType == 0x7F) {
- /* Increasingly more likely to be a FLAC page... */
- drflac_uint8 sig[4];
- if (onRead(pUserData, sig, 4) != 4) {
- return DRFLAC_FALSE;
- }
-
- bytesRemainingInPage -= 4;
- if (sig[0] == 'F' && sig[1] == 'L' && sig[2] == 'A' && sig[3] == 'C') {
- /* Almost certainly a FLAC page... */
- drflac_uint8 mappingVersion[2];
- if (onRead(pUserData, mappingVersion, 2) != 2) {
- return DRFLAC_FALSE;
- }
-
- if (mappingVersion[0] != 1) {
- return DRFLAC_FALSE; /* Only supporting version 1.x of the Ogg mapping. */
- }
-
- /*
- The next 2 bytes are the non-audio packets, not including this one. We don't care about this because we're going to
- be handling it in a generic way based on the serial number and packet types.
- */
- if (!onSeek(pUserData, 2, drflac_seek_origin_current)) {
- return DRFLAC_FALSE;
- }
-
- /* Expecting the native FLAC signature "fLaC". */
- if (onRead(pUserData, sig, 4) != 4) {
- return DRFLAC_FALSE;
- }
-
- if (sig[0] == 'f' && sig[1] == 'L' && sig[2] == 'a' && sig[3] == 'C') {
- /* The remaining data in the page should be the STREAMINFO block. */
- drflac_streaminfo streaminfo;
- drflac_uint8 isLastBlock;
- drflac_uint8 blockType;
- drflac_uint32 blockSize;
- if (!drflac__read_and_decode_block_header(onRead, pUserData, &isLastBlock, &blockType, &blockSize)) {
- return DRFLAC_FALSE;
- }
-
- if (blockType != DRFLAC_METADATA_BLOCK_TYPE_STREAMINFO || blockSize != 34) {
- return DRFLAC_FALSE; /* Invalid block type. First block must be the STREAMINFO block. */
- }
-
- if (drflac__read_streaminfo(onRead, pUserData, &streaminfo)) {
- /* Success! */
- pInit->hasStreamInfoBlock = DRFLAC_TRUE;
- pInit->sampleRate = streaminfo.sampleRate;
- pInit->channels = streaminfo.channels;
- pInit->bitsPerSample = streaminfo.bitsPerSample;
- pInit->totalSampleCount = streaminfo.totalSampleCount;
- pInit->maxBlockSize = streaminfo.maxBlockSize;
- pInit->hasMetadataBlocks = !isLastBlock;
-
- if (onMeta) {
- drflac_metadata metadata;
- metadata.type = DRFLAC_METADATA_BLOCK_TYPE_STREAMINFO;
- metadata.pRawData = NULL;
- metadata.rawDataSize = 0;
- metadata.data.streaminfo = streaminfo;
- onMeta(pUserDataMD, &metadata);
- }
-
- pInit->runningFilePos += pageBodySize;
- pInit->oggFirstBytePos = pInit->runningFilePos - 79; /* Subtracting 79 will place us right on top of the "OggS" identifier of the FLAC bos page. */
- pInit->oggSerial = header.serialNumber;
- pInit->oggBosHeader = header;
- break;
- } else {
- /* Failed to read STREAMINFO block. Aww, so close... */
- return DRFLAC_FALSE;
- }
- } else {
- /* Invalid file. */
- return DRFLAC_FALSE;
- }
- } else {
- /* Not a FLAC header. Skip it. */
- if (!onSeek(pUserData, bytesRemainingInPage, drflac_seek_origin_current)) {
- return DRFLAC_FALSE;
- }
- }
- } else {
- /* Not a FLAC header. Seek past the entire page and move on to the next. */
- if (!onSeek(pUserData, bytesRemainingInPage, drflac_seek_origin_current)) {
- return DRFLAC_FALSE;
- }
- }
- } else {
- if (!onSeek(pUserData, pageBodySize, drflac_seek_origin_current)) {
- return DRFLAC_FALSE;
- }
- }
-
- pInit->runningFilePos += pageBodySize;
-
-
- /* Read the header of the next page. */
- if (drflac_ogg__read_page_header(onRead, pUserData, &header, &bytesRead, &crc32) != DRFLAC_SUCCESS) {
- return DRFLAC_FALSE;
- }
- pInit->runningFilePos += bytesRead;
- }
-
- /*
- If we get here it means we found a FLAC audio stream. We should be sitting on the first byte of the header of the next page. The next
- packets in the FLAC logical stream contain the metadata. The only thing left to do in the initialization phase for Ogg is to create the
- Ogg bistream object.
- */
- pInit->hasMetadataBlocks = DRFLAC_TRUE; /* <-- Always have at least VORBIS_COMMENT metadata block. */
- return DRFLAC_TRUE;
-}
-#endif
-
-drflac_bool32 drflac__init_private(drflac_init_info* pInit, drflac_read_proc onRead, drflac_seek_proc onSeek, drflac_meta_proc onMeta, drflac_container container, void* pUserData, void* pUserDataMD)
-{
- drflac_bool32 relaxed;
- drflac_uint8 id[4];
-
- if (pInit == NULL || onRead == NULL || onSeek == NULL) {
- return DRFLAC_FALSE;
- }
-
- drflac_zero_memory(pInit, sizeof(*pInit));
- pInit->onRead = onRead;
- pInit->onSeek = onSeek;
- pInit->onMeta = onMeta;
- pInit->container = container;
- pInit->pUserData = pUserData;
- pInit->pUserDataMD = pUserDataMD;
-
- pInit->bs.onRead = onRead;
- pInit->bs.onSeek = onSeek;
- pInit->bs.pUserData = pUserData;
- drflac__reset_cache(&pInit->bs);
-
-
- /* If the container is explicitly defined then we can try opening in relaxed mode. */
- relaxed = container != drflac_container_unknown;
-
- /* Skip over any ID3 tags. */
- for (;;) {
- if (onRead(pUserData, id, 4) != 4) {
- return DRFLAC_FALSE; /* Ran out of data. */
- }
- pInit->runningFilePos += 4;
-
- if (id[0] == 'I' && id[1] == 'D' && id[2] == '3') {
- drflac_uint8 header[6];
- drflac_uint8 flags;
- drflac_uint32 headerSize;
-
- if (onRead(pUserData, header, 6) != 6) {
- return DRFLAC_FALSE; /* Ran out of data. */
- }
- pInit->runningFilePos += 6;
-
- flags = header[1];
-
- drflac_copy_memory(&headerSize, header+2, 4);
- headerSize = drflac__unsynchsafe_32(drflac__be2host_32(headerSize));
- if (flags & 0x10) {
- headerSize += 10;
- }
-
- if (!onSeek(pUserData, headerSize, drflac_seek_origin_current)) {
- return DRFLAC_FALSE; /* Failed to seek past the tag. */
- }
- pInit->runningFilePos += headerSize;
- } else {
- break;
- }
- }
-
- if (id[0] == 'f' && id[1] == 'L' && id[2] == 'a' && id[3] == 'C') {
- return drflac__init_private__native(pInit, onRead, onSeek, onMeta, pUserData, pUserDataMD, relaxed);
- }
-#ifndef DR_FLAC_NO_OGG
- if (id[0] == 'O' && id[1] == 'g' && id[2] == 'g' && id[3] == 'S') {
- return drflac__init_private__ogg(pInit, onRead, onSeek, onMeta, pUserData, pUserDataMD, relaxed);
- }
-#endif
-
- /* If we get here it means we likely don't have a header. Try opening in relaxed mode, if applicable. */
- if (relaxed) {
- if (container == drflac_container_native) {
- return drflac__init_private__native(pInit, onRead, onSeek, onMeta, pUserData, pUserDataMD, relaxed);
- }
-#ifndef DR_FLAC_NO_OGG
- if (container == drflac_container_ogg) {
- return drflac__init_private__ogg(pInit, onRead, onSeek, onMeta, pUserData, pUserDataMD, relaxed);
- }
-#endif
- }
-
- /* Unsupported container. */
- return DRFLAC_FALSE;
-}
-
-void drflac__init_from_info(drflac* pFlac, drflac_init_info* pInit)
-{
- drflac_assert(pFlac != NULL);
- drflac_assert(pInit != NULL);
-
- drflac_zero_memory(pFlac, sizeof(*pFlac));
- pFlac->bs = pInit->bs;
- pFlac->onMeta = pInit->onMeta;
- pFlac->pUserDataMD = pInit->pUserDataMD;
- pFlac->maxBlockSize = pInit->maxBlockSize;
- pFlac->sampleRate = pInit->sampleRate;
- pFlac->channels = (drflac_uint8)pInit->channels;
- pFlac->bitsPerSample = (drflac_uint8)pInit->bitsPerSample;
- pFlac->totalSampleCount = pInit->totalSampleCount;
- pFlac->totalPCMFrameCount = pInit->totalSampleCount / pFlac->channels;
- pFlac->container = pInit->container;
-}
-
-drflac* drflac_open_with_metadata_private(drflac_read_proc onRead, drflac_seek_proc onSeek, drflac_meta_proc onMeta, drflac_container container, void* pUserData, void* pUserDataMD)
-{
- drflac_init_info init;
- drflac_uint32 allocationSize;
- drflac_uint32 wholeSIMDVectorCountPerChannel;
- drflac_uint32 decodedSamplesAllocationSize;
-#ifndef DR_FLAC_NO_OGG
- drflac_uint32 oggbsAllocationSize;
- drflac_oggbs oggbs;
-#endif
- drflac_uint64 firstFramePos;
- drflac_uint64 seektablePos;
- drflac_uint32 seektableSize;
- drflac* pFlac;
-
-#ifndef DRFLAC_NO_CPUID
- /* CPU support first. */
- drflac__init_cpu_caps();
-#endif
-
- if (!drflac__init_private(&init, onRead, onSeek, onMeta, container, pUserData, pUserDataMD)) {
- return NULL;
- }
-
- /*
- The size of the allocation for the drflac object needs to be large enough to fit the following:
- 1) The main members of the drflac structure
- 2) A block of memory large enough to store the decoded samples of the largest frame in the stream
- 3) If the container is Ogg, a drflac_oggbs object
-
- The complicated part of the allocation is making sure there's enough room the decoded samples, taking into consideration
- the different SIMD instruction sets.
- */
- allocationSize = sizeof(drflac);
-
- /*
- The allocation size for decoded frames depends on the number of 32-bit integers that fit inside the largest SIMD vector
- we are supporting.
- */
- if (((init.maxBlockSize+DRFLAC_LEADING_SAMPLES) % (DRFLAC_MAX_SIMD_VECTOR_SIZE / sizeof(drflac_int32))) == 0) {
- wholeSIMDVectorCountPerChannel = ((init.maxBlockSize+DRFLAC_LEADING_SAMPLES) / (DRFLAC_MAX_SIMD_VECTOR_SIZE / sizeof(drflac_int32)));
- } else {
- wholeSIMDVectorCountPerChannel = ((init.maxBlockSize+DRFLAC_LEADING_SAMPLES) / (DRFLAC_MAX_SIMD_VECTOR_SIZE / sizeof(drflac_int32))) + 1;
- }
-
- decodedSamplesAllocationSize = wholeSIMDVectorCountPerChannel * DRFLAC_MAX_SIMD_VECTOR_SIZE * init.channels;
-
- allocationSize += decodedSamplesAllocationSize;
- allocationSize += DRFLAC_MAX_SIMD_VECTOR_SIZE; /* Allocate extra bytes to ensure we have enough for alignment. */
-
-#ifndef DR_FLAC_NO_OGG
- /* There's additional data required for Ogg streams. */
- oggbsAllocationSize = 0;
- if (init.container == drflac_container_ogg) {
- oggbsAllocationSize = sizeof(drflac_oggbs);
- allocationSize += oggbsAllocationSize;
- }
-
- drflac_zero_memory(&oggbs, sizeof(oggbs));
- if (init.container == drflac_container_ogg) {
- oggbs.onRead = onRead;
- oggbs.onSeek = onSeek;
- oggbs.pUserData = pUserData;
- oggbs.currentBytePos = init.oggFirstBytePos;
- oggbs.firstBytePos = init.oggFirstBytePos;
- oggbs.serialNumber = init.oggSerial;
- oggbs.bosPageHeader = init.oggBosHeader;
- oggbs.bytesRemainingInPage = 0;
- }
-#endif
-
- /*
- This part is a bit awkward. We need to load the seektable so that it can be referenced in-memory, but I want the drflac object to
- consist of only a single heap allocation. To this, the size of the seek table needs to be known, which we determine when reading
- and decoding the metadata.
- */
- firstFramePos = 42; /* <-- We know we are at byte 42 at this point. */
- seektablePos = 0;
- seektableSize = 0;
- if (init.hasMetadataBlocks) {
- drflac_read_proc onReadOverride = onRead;
- drflac_seek_proc onSeekOverride = onSeek;
- void* pUserDataOverride = pUserData;
-
-#ifndef DR_FLAC_NO_OGG
- if (init.container == drflac_container_ogg) {
- onReadOverride = drflac__on_read_ogg;
- onSeekOverride = drflac__on_seek_ogg;
- pUserDataOverride = (void*)&oggbs;
- }
-#endif
-
- if (!drflac__read_and_decode_metadata(onReadOverride, onSeekOverride, onMeta, pUserDataOverride, pUserDataMD, &firstFramePos, &seektablePos, &seektableSize)) {
- return NULL;
- }
-
- allocationSize += seektableSize;
- }
-
-
- pFlac = (drflac*)DRFLAC_MALLOC(allocationSize);
- drflac__init_from_info(pFlac, &init);
- pFlac->pDecodedSamples = (drflac_int32*)drflac_align((size_t)pFlac->pExtraData, DRFLAC_MAX_SIMD_VECTOR_SIZE);
-
-#ifndef DR_FLAC_NO_OGG
- if (init.container == drflac_container_ogg) {
- drflac_oggbs* pInternalOggbs = (drflac_oggbs*)((drflac_uint8*)pFlac->pDecodedSamples + decodedSamplesAllocationSize + seektableSize);
- *pInternalOggbs = oggbs;
-
- /* The Ogg bistream needs to be layered on top of the original bitstream. */
- pFlac->bs.onRead = drflac__on_read_ogg;
- pFlac->bs.onSeek = drflac__on_seek_ogg;
- pFlac->bs.pUserData = (void*)pInternalOggbs;
- pFlac->_oggbs = (void*)pInternalOggbs;
- }
-#endif
-
- pFlac->firstFramePos = firstFramePos;
-
- /* NOTE: Seektables are not currently compatible with Ogg encapsulation (Ogg has its own accelerated seeking system). I may change this later, so I'm leaving this here for now. */
-#ifndef DR_FLAC_NO_OGG
- if (init.container == drflac_container_ogg)
- {
- pFlac->pSeekpoints = NULL;
- pFlac->seekpointCount = 0;
- }
- else
-#endif
- {
- /* If we have a seektable we need to load it now, making sure we move back to where we were previously. */
- if (seektablePos != 0) {
- pFlac->seekpointCount = seektableSize / sizeof(*pFlac->pSeekpoints);
- pFlac->pSeekpoints = (drflac_seekpoint*)((drflac_uint8*)pFlac->pDecodedSamples + decodedSamplesAllocationSize);
-
- /* Seek to the seektable, then just read directly into our seektable buffer. */
- if (pFlac->bs.onSeek(pFlac->bs.pUserData, (int)seektablePos, drflac_seek_origin_start)) {
- if (pFlac->bs.onRead(pFlac->bs.pUserData, pFlac->pSeekpoints, seektableSize) == seektableSize) {
- /* Endian swap. */
- drflac_uint32 iSeekpoint;
- for (iSeekpoint = 0; iSeekpoint < pFlac->seekpointCount; ++iSeekpoint) {
- pFlac->pSeekpoints[iSeekpoint].firstSample = drflac__be2host_64(pFlac->pSeekpoints[iSeekpoint].firstSample);
- pFlac->pSeekpoints[iSeekpoint].frameOffset = drflac__be2host_64(pFlac->pSeekpoints[iSeekpoint].frameOffset);
- pFlac->pSeekpoints[iSeekpoint].sampleCount = drflac__be2host_16(pFlac->pSeekpoints[iSeekpoint].sampleCount);
- }
- } else {
- /* Failed to read the seektable. Pretend we don't have one. */
- pFlac->pSeekpoints = NULL;
- pFlac->seekpointCount = 0;
- }
-
- /* We need to seek back to where we were. If this fails it's a critical error. */
- if (!pFlac->bs.onSeek(pFlac->bs.pUserData, (int)pFlac->firstFramePos, drflac_seek_origin_start)) {
- DRFLAC_FREE(pFlac);
- return NULL;
- }
- } else {
- /* Failed to seek to the seektable. Ominous sign, but for now we can just pretend we don't have one. */
- pFlac->pSeekpoints = NULL;
- pFlac->seekpointCount = 0;
- }
- }
- }
-
-
- /*
- If we get here, but don't have a STREAMINFO block, it means we've opened the stream in relaxed mode and need to decode
- the first frame.
- */
- if (!init.hasStreamInfoBlock) {
- pFlac->currentFrame.header = init.firstFrameHeader;
- do
- {
- drflac_result result = drflac__decode_flac_frame(pFlac);
- if (result == DRFLAC_SUCCESS) {
- break;
- } else {
- if (result == DRFLAC_CRC_MISMATCH) {
- if (!drflac__read_next_flac_frame_header(&pFlac->bs, pFlac->bitsPerSample, &pFlac->currentFrame.header)) {
- DRFLAC_FREE(pFlac);
- return NULL;
- }
- continue;
- } else {
- DRFLAC_FREE(pFlac);
- return NULL;
- }
- }
- } while (1);
- }
-
- return pFlac;
-}
-
-
-
-#ifndef DR_FLAC_NO_STDIO
-#include <stdio.h>
-
-static size_t drflac__on_read_stdio(void* pUserData, void* bufferOut, size_t bytesToRead)
-{
- return fread(bufferOut, 1, bytesToRead, (FILE*)pUserData);
-}
-
-static drflac_bool32 drflac__on_seek_stdio(void* pUserData, int offset, drflac_seek_origin origin)
-{
- drflac_assert(offset >= 0); /* <-- Never seek backwards. */
-
- return fseek((FILE*)pUserData, offset, (origin == drflac_seek_origin_current) ? SEEK_CUR : SEEK_SET) == 0;
-}
-
-static FILE* drflac__fopen(const char* filename)
-{
- FILE* pFile;
-#if defined(_MSC_VER) && _MSC_VER >= 1400
- if (fopen_s(&pFile, filename, "rb") != 0) {
- return NULL;
- }
-#else
- pFile = fopen(filename, "rb");
- if (pFile == NULL) {
- return NULL;
- }
-#endif
-
- return pFile;
-}
-
-
-drflac* drflac_open_file(const char* filename)
-{
- drflac* pFlac;
- FILE* pFile;
-
- pFile = drflac__fopen(filename);
- if (pFile == NULL) {
- return NULL;
- }
-
- pFlac = drflac_open(drflac__on_read_stdio, drflac__on_seek_stdio, (void*)pFile);
- if (pFlac == NULL) {
- fclose(pFile);
- return NULL;
- }
-
- return pFlac;
-}
-
-drflac* drflac_open_file_with_metadata(const char* filename, drflac_meta_proc onMeta, void* pUserData)
-{
- drflac* pFlac;
- FILE* pFile;
-
- pFile = drflac__fopen(filename);
- if (pFile == NULL) {
- return NULL;
- }
-
- pFlac = drflac_open_with_metadata_private(drflac__on_read_stdio, drflac__on_seek_stdio, onMeta, drflac_container_unknown, (void*)pFile, pUserData);
- if (pFlac == NULL) {
- fclose(pFile);
- return pFlac;
- }
-
- return pFlac;
-}
-#endif /* DR_FLAC_NO_STDIO */
-
-static size_t drflac__on_read_memory(void* pUserData, void* bufferOut, size_t bytesToRead)
-{
- drflac__memory_stream* memoryStream = (drflac__memory_stream*)pUserData;
- size_t bytesRemaining;
-
- drflac_assert(memoryStream != NULL);
- drflac_assert(memoryStream->dataSize >= memoryStream->currentReadPos);
-
- bytesRemaining = memoryStream->dataSize - memoryStream->currentReadPos;
- if (bytesToRead > bytesRemaining) {
- bytesToRead = bytesRemaining;
- }
-
- if (bytesToRead > 0) {
- drflac_copy_memory(bufferOut, memoryStream->data + memoryStream->currentReadPos, bytesToRead);
- memoryStream->currentReadPos += bytesToRead;
- }
-
- return bytesToRead;
-}
-
-static drflac_bool32 drflac__on_seek_memory(void* pUserData, int offset, drflac_seek_origin origin)
-{
- drflac__memory_stream* memoryStream = (drflac__memory_stream*)pUserData;
-
- drflac_assert(memoryStream != NULL);
- drflac_assert(offset >= 0); /* <-- Never seek backwards. */
-
- if (offset > (drflac_int64)memoryStream->dataSize) {
- return DRFLAC_FALSE;
- }
-
- if (origin == drflac_seek_origin_current) {
- if (memoryStream->currentReadPos + offset <= memoryStream->dataSize) {
- memoryStream->currentReadPos += offset;
- } else {
- return DRFLAC_FALSE; /* Trying to seek too far forward. */
- }
- } else {
- if ((drflac_uint32)offset <= memoryStream->dataSize) {
- memoryStream->currentReadPos = offset;
- } else {
- return DRFLAC_FALSE; /* Trying to seek too far forward. */
- }
- }
-
- return DRFLAC_TRUE;
-}
-
-drflac* drflac_open_memory(const void* data, size_t dataSize)
-{
- drflac__memory_stream memoryStream;
- drflac* pFlac;
-
- memoryStream.data = (const unsigned char*)data;
- memoryStream.dataSize = dataSize;
- memoryStream.currentReadPos = 0;
- pFlac = drflac_open(drflac__on_read_memory, drflac__on_seek_memory, &memoryStream);
- if (pFlac == NULL) {
- return NULL;
- }
-
- pFlac->memoryStream = memoryStream;
-
- /* This is an awful hack... */
-#ifndef DR_FLAC_NO_OGG
- if (pFlac->container == drflac_container_ogg)
- {
- drflac_oggbs* oggbs = (drflac_oggbs*)pFlac->_oggbs;
- oggbs->pUserData = &pFlac->memoryStream;
- }
- else
-#endif
- {
- pFlac->bs.pUserData = &pFlac->memoryStream;
- }
-
- return pFlac;
-}
-
-drflac* drflac_open_memory_with_metadata(const void* data, size_t dataSize, drflac_meta_proc onMeta, void* pUserData)
-{
- drflac__memory_stream memoryStream;
- drflac* pFlac;
-
- memoryStream.data = (const unsigned char*)data;
- memoryStream.dataSize = dataSize;
- memoryStream.currentReadPos = 0;
- pFlac = drflac_open_with_metadata_private(drflac__on_read_memory, drflac__on_seek_memory, onMeta, drflac_container_unknown, &memoryStream, pUserData);
- if (pFlac == NULL) {
- return NULL;
- }
-
- pFlac->memoryStream = memoryStream;
-
- /* This is an awful hack... */
-#ifndef DR_FLAC_NO_OGG
- if (pFlac->container == drflac_container_ogg)
- {
- drflac_oggbs* oggbs = (drflac_oggbs*)pFlac->_oggbs;
- oggbs->pUserData = &pFlac->memoryStream;
- }
- else
-#endif
- {
- pFlac->bs.pUserData = &pFlac->memoryStream;
- }
-
- return pFlac;
-}
-
-
-
-drflac* drflac_open(drflac_read_proc onRead, drflac_seek_proc onSeek, void* pUserData)
-{
- return drflac_open_with_metadata_private(onRead, onSeek, NULL, drflac_container_unknown, pUserData, pUserData);
-}
-drflac* drflac_open_relaxed(drflac_read_proc onRead, drflac_seek_proc onSeek, drflac_container container, void* pUserData)
-{
- return drflac_open_with_metadata_private(onRead, onSeek, NULL, container, pUserData, pUserData);
-}
-
-drflac* drflac_open_with_metadata(drflac_read_proc onRead, drflac_seek_proc onSeek, drflac_meta_proc onMeta, void* pUserData)
-{
- return drflac_open_with_metadata_private(onRead, onSeek, onMeta, drflac_container_unknown, pUserData, pUserData);
-}
-drflac* drflac_open_with_metadata_relaxed(drflac_read_proc onRead, drflac_seek_proc onSeek, drflac_meta_proc onMeta, drflac_container container, void* pUserData)
-{
- return drflac_open_with_metadata_private(onRead, onSeek, onMeta, container, pUserData, pUserData);
-}
-
-void drflac_close(drflac* pFlac)
-{
- if (pFlac == NULL) {
- return;
- }
-
-#ifndef DR_FLAC_NO_STDIO
- /*
- If we opened the file with drflac_open_file() we will want to close the file handle. We can know whether or not drflac_open_file()
- was used by looking at the callbacks.
- */
- if (pFlac->bs.onRead == drflac__on_read_stdio) {
- fclose((FILE*)pFlac->bs.pUserData);
- }
-
-#ifndef DR_FLAC_NO_OGG
- /* Need to clean up Ogg streams a bit differently due to the way the bit streaming is chained. */
- if (pFlac->container == drflac_container_ogg) {
- drflac_oggbs* oggbs = (drflac_oggbs*)pFlac->_oggbs;
- drflac_assert(pFlac->bs.onRead == drflac__on_read_ogg);
-
- if (oggbs->onRead == drflac__on_read_stdio) {
- fclose((FILE*)oggbs->pUserData);
- }
- }
-#endif
-#endif
-
- DRFLAC_FREE(pFlac);
-}
-
-drflac_uint64 drflac__read_s32__misaligned(drflac* pFlac, drflac_uint64 samplesToRead, drflac_int32* bufferOut)
-{
- unsigned int channelCount = drflac__get_channel_count_from_channel_assignment(pFlac->currentFrame.header.channelAssignment);
- drflac_uint64 samplesRead;
-
- /* We should never be calling this when the number of samples to read is >= the sample count. */
- drflac_assert(samplesToRead < channelCount);
- drflac_assert(pFlac->currentFrame.samplesRemaining > 0 && samplesToRead <= pFlac->currentFrame.samplesRemaining);
-
- samplesRead = 0;
- while (samplesToRead > 0) {
- drflac_uint64 totalSamplesInFrame = pFlac->currentFrame.header.blockSize * channelCount;
- drflac_uint64 samplesReadFromFrameSoFar = totalSamplesInFrame - pFlac->currentFrame.samplesRemaining;
- drflac_uint64 channelIndex = samplesReadFromFrameSoFar % channelCount;
- drflac_uint64 nextSampleInFrame = samplesReadFromFrameSoFar / channelCount;
- int decodedSample = 0;
-
- switch (pFlac->currentFrame.header.channelAssignment)
- {
- case DRFLAC_CHANNEL_ASSIGNMENT_LEFT_SIDE:
- {
- if (channelIndex == 0) {
- decodedSample = (int)((drflac_uint32)pFlac->currentFrame.subframes[channelIndex + 0].pDecodedSamples[nextSampleInFrame] << pFlac->currentFrame.subframes[channelIndex + 0].wastedBitsPerSample);
- } else {
- int side = (int)((drflac_uint32)pFlac->currentFrame.subframes[channelIndex + 0].pDecodedSamples[nextSampleInFrame] << pFlac->currentFrame.subframes[channelIndex + 0].wastedBitsPerSample);
- int left = (int)((drflac_uint32)pFlac->currentFrame.subframes[channelIndex - 1].pDecodedSamples[nextSampleInFrame] << pFlac->currentFrame.subframes[channelIndex - 1].wastedBitsPerSample);
- decodedSample = left - side;
- }
- } break;
-
- case DRFLAC_CHANNEL_ASSIGNMENT_RIGHT_SIDE:
- {
- if (channelIndex == 0) {
- int side = (int)((drflac_uint32)pFlac->currentFrame.subframes[channelIndex + 0].pDecodedSamples[nextSampleInFrame] << pFlac->currentFrame.subframes[channelIndex + 0].wastedBitsPerSample);
- int right = (int)((drflac_uint32)pFlac->currentFrame.subframes[channelIndex + 1].pDecodedSamples[nextSampleInFrame] << pFlac->currentFrame.subframes[channelIndex + 1].wastedBitsPerSample);
- decodedSample = side + right;
- } else {
- decodedSample = (int)((drflac_uint32)pFlac->currentFrame.subframes[channelIndex + 0].pDecodedSamples[nextSampleInFrame] << pFlac->currentFrame.subframes[channelIndex + 0].wastedBitsPerSample);
- }
- } break;
-
- case DRFLAC_CHANNEL_ASSIGNMENT_MID_SIDE:
- {
- int mid;
- int side;
- if (channelIndex == 0) {
- mid = (int)((drflac_uint32)pFlac->currentFrame.subframes[channelIndex + 0].pDecodedSamples[nextSampleInFrame] << pFlac->currentFrame.subframes[channelIndex + 0].wastedBitsPerSample);
- side = (int)((drflac_uint32)pFlac->currentFrame.subframes[channelIndex + 1].pDecodedSamples[nextSampleInFrame] << pFlac->currentFrame.subframes[channelIndex + 1].wastedBitsPerSample);
-
- mid = (((unsigned int)mid) << 1) | (side & 0x01);
- decodedSample = (mid + side) >> 1;
- } else {
- mid = (int)((drflac_uint32)pFlac->currentFrame.subframes[channelIndex - 1].pDecodedSamples[nextSampleInFrame] << pFlac->currentFrame.subframes[channelIndex - 1].wastedBitsPerSample);
- side = (int)((drflac_uint32)pFlac->currentFrame.subframes[channelIndex + 0].pDecodedSamples[nextSampleInFrame] << pFlac->currentFrame.subframes[channelIndex + 0].wastedBitsPerSample);
-
- mid = (((unsigned int)mid) << 1) | (side & 0x01);
- decodedSample = (mid - side) >> 1;
- }
- } break;
-
- case DRFLAC_CHANNEL_ASSIGNMENT_INDEPENDENT:
- default:
- {
- decodedSample = (int)((drflac_uint32)pFlac->currentFrame.subframes[channelIndex + 0].pDecodedSamples[nextSampleInFrame] << pFlac->currentFrame.subframes[channelIndex + 0].wastedBitsPerSample);
- } break;
- }
-
- decodedSample = (int)((drflac_uint32)decodedSample << (32 - pFlac->bitsPerSample));
-
- if (bufferOut) {
- *bufferOut++ = decodedSample;
- }
-
- samplesRead += 1;
- pFlac->currentFrame.samplesRemaining -= 1;
- samplesToRead -= 1;
- }
-
- return samplesRead;
-}
-
-drflac_uint64 drflac_read_s32(drflac* pFlac, drflac_uint64 samplesToRead, drflac_int32* bufferOut)
-{
- drflac_uint64 samplesRead;
-
- /* Note that <bufferOut> is allowed to be null, in which case this will act like a seek. */
- if (pFlac == NULL || samplesToRead == 0) {
- return 0;
- }
-
- if (bufferOut == NULL) {
- return drflac__seek_forward_by_samples(pFlac, samplesToRead);
- }
-
- samplesRead = 0;
- while (samplesToRead > 0) {
- /* If we've run out of samples in this frame, go to the next. */
- if (pFlac->currentFrame.samplesRemaining == 0) {
- if (!drflac__read_and_decode_next_flac_frame(pFlac)) {
- break; /* Couldn't read the next frame, so just break from the loop and return. */
- }
- } else {
- /* Here is where we grab the samples and interleave them. */
- unsigned int channelCount = drflac__get_channel_count_from_channel_assignment(pFlac->currentFrame.header.channelAssignment);
- drflac_uint64 totalSamplesInFrame = pFlac->currentFrame.header.blockSize * channelCount;
- drflac_uint64 samplesReadFromFrameSoFar = totalSamplesInFrame - pFlac->currentFrame.samplesRemaining;
- drflac_uint64 misalignedSampleCount = samplesReadFromFrameSoFar % channelCount;
- drflac_uint64 alignedSampleCountPerChannel;
- drflac_uint64 firstAlignedSampleInFrame;
- unsigned int unusedBitsPerSample;
- drflac_uint64 alignedSamplesRead;
-
- if (misalignedSampleCount > 0) {
- drflac_uint64 misalignedSamplesRead = drflac__read_s32__misaligned(pFlac, misalignedSampleCount, bufferOut);
- samplesRead += misalignedSamplesRead;
- samplesReadFromFrameSoFar += misalignedSamplesRead;
- bufferOut += misalignedSamplesRead;
- samplesToRead -= misalignedSamplesRead;
- pFlac->currentSample += misalignedSamplesRead;
- }
-
-
- alignedSampleCountPerChannel = samplesToRead / channelCount;
- if (alignedSampleCountPerChannel > pFlac->currentFrame.samplesRemaining / channelCount) {
- alignedSampleCountPerChannel = pFlac->currentFrame.samplesRemaining / channelCount;
- }
-
- firstAlignedSampleInFrame = samplesReadFromFrameSoFar / channelCount;
- unusedBitsPerSample = 32 - pFlac->bitsPerSample;
-
- switch (pFlac->currentFrame.header.channelAssignment)
- {
- case DRFLAC_CHANNEL_ASSIGNMENT_LEFT_SIDE:
- {
- drflac_uint64 i;
- const drflac_int32* pDecodedSamples0 = pFlac->currentFrame.subframes[0].pDecodedSamples + firstAlignedSampleInFrame;
- const drflac_int32* pDecodedSamples1 = pFlac->currentFrame.subframes[1].pDecodedSamples + firstAlignedSampleInFrame;
-
- for (i = 0; i < alignedSampleCountPerChannel; ++i) {
- int left = (int)((drflac_uint32)pDecodedSamples0[i] << (unusedBitsPerSample + pFlac->currentFrame.subframes[0].wastedBitsPerSample));
- int side = (int)((drflac_uint32)pDecodedSamples1[i] << (unusedBitsPerSample + pFlac->currentFrame.subframes[1].wastedBitsPerSample));
- int right = left - side;
-
- bufferOut[i*2+0] = left;
- bufferOut[i*2+1] = right;
- }
- } break;
-
- case DRFLAC_CHANNEL_ASSIGNMENT_RIGHT_SIDE:
- {
- drflac_uint64 i;
- const drflac_int32* pDecodedSamples0 = pFlac->currentFrame.subframes[0].pDecodedSamples + firstAlignedSampleInFrame;
- const drflac_int32* pDecodedSamples1 = pFlac->currentFrame.subframes[1].pDecodedSamples + firstAlignedSampleInFrame;
-
- for (i = 0; i < alignedSampleCountPerChannel; ++i) {
- int side = (int)((drflac_uint32)pDecodedSamples0[i] << (unusedBitsPerSample + pFlac->currentFrame.subframes[0].wastedBitsPerSample));
- int right = (int)((drflac_uint32)pDecodedSamples1[i] << (unusedBitsPerSample + pFlac->currentFrame.subframes[1].wastedBitsPerSample));
- int left = right + side;
-
- bufferOut[i*2+0] = left;
- bufferOut[i*2+1] = right;
- }
- } break;
-
- case DRFLAC_CHANNEL_ASSIGNMENT_MID_SIDE:
- {
- drflac_uint64 i;
- const drflac_int32* pDecodedSamples0 = pFlac->currentFrame.subframes[0].pDecodedSamples + firstAlignedSampleInFrame;
- const drflac_int32* pDecodedSamples1 = pFlac->currentFrame.subframes[1].pDecodedSamples + firstAlignedSampleInFrame;
-
- for (i = 0; i < alignedSampleCountPerChannel; ++i) {
- int mid = (int)((drflac_uint32)pDecodedSamples0[i] << pFlac->currentFrame.subframes[0].wastedBitsPerSample);
- int side = (int)((drflac_uint32)pDecodedSamples1[i] << pFlac->currentFrame.subframes[1].wastedBitsPerSample);
-
- mid = (((drflac_uint32)mid) << 1) | (side & 0x01);
-
- bufferOut[i*2+0] = (drflac_int32)((drflac_uint32)((mid + side) >> 1) << (unusedBitsPerSample));
- bufferOut[i*2+1] = (drflac_int32)((drflac_uint32)((mid - side) >> 1) << (unusedBitsPerSample));
- }
- } break;
-
- case DRFLAC_CHANNEL_ASSIGNMENT_INDEPENDENT:
- default:
- {
- if (pFlac->currentFrame.header.channelAssignment == 1) /* 1 = Stereo */
- {
- /* Stereo optimized inner loop unroll. */
- drflac_uint64 i;
- const drflac_int32* pDecodedSamples0 = pFlac->currentFrame.subframes[0].pDecodedSamples + firstAlignedSampleInFrame;
- const drflac_int32* pDecodedSamples1 = pFlac->currentFrame.subframes[1].pDecodedSamples + firstAlignedSampleInFrame;
-
- for (i = 0; i < alignedSampleCountPerChannel; ++i) {
- bufferOut[i*2+0] = (drflac_int32)((drflac_uint32)pDecodedSamples0[i] << (unusedBitsPerSample + pFlac->currentFrame.subframes[0].wastedBitsPerSample));
- bufferOut[i*2+1] = (drflac_int32)((drflac_uint32)pDecodedSamples1[i] << (unusedBitsPerSample + pFlac->currentFrame.subframes[1].wastedBitsPerSample));
- }
- }
- else
- {
- /* Generic interleaving. */
- drflac_uint64 i;
- for (i = 0; i < alignedSampleCountPerChannel; ++i) {
- unsigned int j;
- for (j = 0; j < channelCount; ++j) {
- bufferOut[(i*channelCount)+j] = (drflac_int32)((drflac_uint32)(pFlac->currentFrame.subframes[j].pDecodedSamples[firstAlignedSampleInFrame + i]) << (unusedBitsPerSample + pFlac->currentFrame.subframes[j].wastedBitsPerSample));
- }
- }
- }
- } break;
- }
-
- alignedSamplesRead = alignedSampleCountPerChannel * channelCount;
- samplesRead += alignedSamplesRead;
- samplesReadFromFrameSoFar += alignedSamplesRead;
- bufferOut += alignedSamplesRead;
- samplesToRead -= alignedSamplesRead;
- pFlac->currentSample += alignedSamplesRead;
- pFlac->currentFrame.samplesRemaining -= (unsigned int)alignedSamplesRead;
-
-
- /* At this point we may still have some excess samples left to read. */
- if (samplesToRead > 0 && pFlac->currentFrame.samplesRemaining > 0) {
- drflac_uint64 excessSamplesRead = 0;
- if (samplesToRead < pFlac->currentFrame.samplesRemaining) {
- excessSamplesRead = drflac__read_s32__misaligned(pFlac, samplesToRead, bufferOut);
- } else {
- excessSamplesRead = drflac__read_s32__misaligned(pFlac, pFlac->currentFrame.samplesRemaining, bufferOut);
- }
-
- samplesRead += excessSamplesRead;
- samplesReadFromFrameSoFar += excessSamplesRead;
- bufferOut += excessSamplesRead;
- samplesToRead -= excessSamplesRead;
- pFlac->currentSample += excessSamplesRead;
- }
- }
- }
-
- return samplesRead;
-}
-
-drflac_uint64 drflac_read_pcm_frames_s32(drflac* pFlac, drflac_uint64 framesToRead, drflac_int32* pBufferOut)
-{
-#if defined(_MSC_VER) && !defined(__clang__)
- #pragma warning(push)
- #pragma warning(disable:4996) /* was declared deprecated */
-#elif defined(__GNUC__) || defined(__clang__)
- #pragma GCC diagnostic push
- #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-#endif
- return drflac_read_s32(pFlac, framesToRead*pFlac->channels, pBufferOut) / pFlac->channels;
-#if defined(_MSC_VER) && !defined(__clang__)
- #pragma warning(pop)
-#elif defined(__GNUC__) || defined(__clang__)
- #pragma GCC diagnostic pop
-#endif
-}
-
-
-drflac_uint64 drflac_read_s16(drflac* pFlac, drflac_uint64 samplesToRead, drflac_int16* pBufferOut)
-{
- /* This reads samples in 2 passes and can probably be optimized. */
- drflac_uint64 totalSamplesRead = 0;
-
-#if defined(_MSC_VER) && !defined(__clang__)
- #pragma warning(push)
- #pragma warning(disable:4996) /* was declared deprecated */
-#elif defined(__GNUC__) || defined(__clang__)
- #pragma GCC diagnostic push
- #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-#endif
-
- while (samplesToRead > 0) {
- drflac_uint64 i;
- drflac_int32 samples32[4096];
- drflac_uint64 samplesJustRead = drflac_read_s32(pFlac, (samplesToRead > 4096) ? 4096 : samplesToRead, samples32);
- if (samplesJustRead == 0) {
- break; /* Reached the end. */
- }
-
- /* s32 -> s16 */
- for (i = 0; i < samplesJustRead; ++i) {
- pBufferOut[i] = (drflac_int16)(samples32[i] >> 16);
- }
-
- totalSamplesRead += samplesJustRead;
- samplesToRead -= samplesJustRead;
- pBufferOut += samplesJustRead;
- }
-
-#if defined(_MSC_VER) && !defined(__clang__)
- #pragma warning(pop)
-#elif defined(__GNUC__) || defined(__clang__)
- #pragma GCC diagnostic pop
-#endif
-
- return totalSamplesRead;
-}
-
-drflac_uint64 drflac_read_pcm_frames_s16(drflac* pFlac, drflac_uint64 framesToRead, drflac_int16* pBufferOut)
-{
- /* This reads samples in 2 passes and can probably be optimized. */
- drflac_uint64 totalPCMFramesRead = 0;
-
- while (framesToRead > 0) {
- drflac_uint64 iFrame;
- drflac_int32 samples32[4096];
- drflac_uint64 framesJustRead = drflac_read_pcm_frames_s32(pFlac, (framesToRead > 4096/pFlac->channels) ? 4096/pFlac->channels : framesToRead, samples32);
- if (framesJustRead == 0) {
- break; /* Reached the end. */
- }
-
- /* s32 -> s16 */
- for (iFrame = 0; iFrame < framesJustRead; ++iFrame) {
- drflac_uint32 iChannel;
- for (iChannel = 0; iChannel < pFlac->channels; ++iChannel) {
- drflac_uint64 iSample = iFrame*pFlac->channels + iChannel;
- pBufferOut[iSample] = (drflac_int16)(samples32[iSample] >> 16);
- }
- }
-
- totalPCMFramesRead += framesJustRead;
- framesToRead -= framesJustRead;
- pBufferOut += framesJustRead * pFlac->channels;
- }
-
- return totalPCMFramesRead;
-}
-
-
-drflac_uint64 drflac_read_f32(drflac* pFlac, drflac_uint64 samplesToRead, float* pBufferOut)
-{
- /* This reads samples in 2 passes and can probably be optimized. */
- drflac_uint64 totalSamplesRead = 0;
-
-#if defined(_MSC_VER) && !defined(__clang__)
- #pragma warning(push)
- #pragma warning(disable:4996) /* was declared deprecated */
-#elif defined(__GNUC__) || defined(__clang__)
- #pragma GCC diagnostic push
- #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-#endif
-
- while (samplesToRead > 0) {
- drflac_uint64 i;
- drflac_int32 samples32[4096];
- drflac_uint64 samplesJustRead = drflac_read_s32(pFlac, (samplesToRead > 4096) ? 4096 : samplesToRead, samples32);
- if (samplesJustRead == 0) {
- break; /* Reached the end. */
- }
-
- /* s32 -> f32 */
- for (i = 0; i < samplesJustRead; ++i) {
- pBufferOut[i] = (float)(samples32[i] / 2147483648.0);
- }
-
- totalSamplesRead += samplesJustRead;
- samplesToRead -= samplesJustRead;
- pBufferOut += samplesJustRead;
- }
-
-#if defined(_MSC_VER) && !defined(__clang__)
- #pragma warning(pop)
-#elif defined(__GNUC__) || defined(__clang__)
- #pragma GCC diagnostic pop
-#endif
-
- return totalSamplesRead;
-}
-
-#if 0
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_left_side__reference(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
- drflac_uint64 i;
- for (i = 0; i < frameCount; ++i) {
- int left = pInputSamples0[i] << (unusedBitsPerSample + pFlac->currentFrame.subframes[0].wastedBitsPerSample);
- int side = pInputSamples1[i] << (unusedBitsPerSample + pFlac->currentFrame.subframes[1].wastedBitsPerSample);
- int right = left - side;
-
- pOutputSamples[i*2+0] = (float)(left / 2147483648.0);
- pOutputSamples[i*2+1] = (float)(right / 2147483648.0);
- }
-}
-#endif
-
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_left_side__scalar(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
- drflac_uint64 i;
- drflac_uint64 frameCount4 = frameCount >> 2;
-
- float factor = 1 / 2147483648.0;
-
- drflac_int32 shift0 = unusedBitsPerSample + pFlac->currentFrame.subframes[0].wastedBitsPerSample;
- drflac_int32 shift1 = unusedBitsPerSample + pFlac->currentFrame.subframes[1].wastedBitsPerSample;
- for (i = 0; i < frameCount4; ++i) {
- drflac_int32 left0 = pInputSamples0[i*4+0] << shift0;
- drflac_int32 left1 = pInputSamples0[i*4+1] << shift0;
- drflac_int32 left2 = pInputSamples0[i*4+2] << shift0;
- drflac_int32 left3 = pInputSamples0[i*4+3] << shift0;
-
- drflac_int32 side0 = pInputSamples1[i*4+0] << shift1;
- drflac_int32 side1 = pInputSamples1[i*4+1] << shift1;
- drflac_int32 side2 = pInputSamples1[i*4+2] << shift1;
- drflac_int32 side3 = pInputSamples1[i*4+3] << shift1;
-
- drflac_int32 right0 = left0 - side0;
- drflac_int32 right1 = left1 - side1;
- drflac_int32 right2 = left2 - side2;
- drflac_int32 right3 = left3 - side3;
-
- pOutputSamples[i*8+0] = left0 * factor;
- pOutputSamples[i*8+1] = right0 * factor;
- pOutputSamples[i*8+2] = left1 * factor;
- pOutputSamples[i*8+3] = right1 * factor;
- pOutputSamples[i*8+4] = left2 * factor;
- pOutputSamples[i*8+5] = right2 * factor;
- pOutputSamples[i*8+6] = left3 * factor;
- pOutputSamples[i*8+7] = right3 * factor;
- }
-
- for (i = (frameCount4 << 2); i < frameCount; ++i) {
- int left = pInputSamples0[i] << shift0;
- int side = pInputSamples1[i] << shift1;
- int right = left - side;
-
- pOutputSamples[i*2+0] = (float)(left * factor);
- pOutputSamples[i*2+1] = (float)(right * factor);
- }
-}
-
-#if defined(DRFLAC_SUPPORT_SSE2)
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_left_side__sse2(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
- drflac_uint64 frameCount4;
- __m128 factor;
- int shift0;
- int shift1;
- drflac_uint64 i;
-
- drflac_assert(pFlac->bitsPerSample <= 24);
-
- frameCount4 = frameCount >> 2;
-
- factor = _mm_set1_ps(1.0f / 8388608.0f);
- shift0 = (unusedBitsPerSample + pFlac->currentFrame.subframes[0].wastedBitsPerSample) - 8;
- shift1 = (unusedBitsPerSample + pFlac->currentFrame.subframes[1].wastedBitsPerSample) - 8;
-
- for (i = 0; i < frameCount4; ++i) {
- __m128i inputSample0 = _mm_loadu_si128((const __m128i*)pInputSamples0 + i);
- __m128i inputSample1 = _mm_loadu_si128((const __m128i*)pInputSamples1 + i);
-
- __m128i left = _mm_slli_epi32(inputSample0, shift0);
- __m128i side = _mm_slli_epi32(inputSample1, shift1);
- __m128i right = _mm_sub_epi32(left, side);
- __m128 leftf = _mm_mul_ps(_mm_cvtepi32_ps(left), factor);
- __m128 rightf = _mm_mul_ps(_mm_cvtepi32_ps(right), factor);
-
- pOutputSamples[i*8+0] = ((float*)&leftf)[0];
- pOutputSamples[i*8+1] = ((float*)&rightf)[0];
- pOutputSamples[i*8+2] = ((float*)&leftf)[1];
- pOutputSamples[i*8+3] = ((float*)&rightf)[1];
- pOutputSamples[i*8+4] = ((float*)&leftf)[2];
- pOutputSamples[i*8+5] = ((float*)&rightf)[2];
- pOutputSamples[i*8+6] = ((float*)&leftf)[3];
- pOutputSamples[i*8+7] = ((float*)&rightf)[3];
- }
-
- for (i = (frameCount4 << 2); i < frameCount; ++i) {
- int left = pInputSamples0[i] << shift0;
- int side = pInputSamples1[i] << shift1;
- int right = left - side;
-
- pOutputSamples[i*2+0] = (float)(left / 8388608.0f);
- pOutputSamples[i*2+1] = (float)(right / 8388608.0f);
- }
-}
-#endif
-
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_left_side(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
-#if defined(DRFLAC_SUPPORT_SSE2)
- if (drflac__gIsSSE2Supported && pFlac->bitsPerSample <= 24) {
- drflac_read_pcm_frames_f32__decode_left_side__sse2(pFlac, frameCount, unusedBitsPerSample, pInputSamples0, pInputSamples1, pOutputSamples);
- } else
-#endif
- {
- /* Scalar fallback. */
-#if 0
- drflac_read_pcm_frames_f32__decode_left_side__reference(pFlac, frameCount, unusedBitsPerSample, pInputSamples0, pInputSamples1, pOutputSamples);
-#else
- drflac_read_pcm_frames_f32__decode_left_side__scalar(pFlac, frameCount, unusedBitsPerSample, pInputSamples0, pInputSamples1, pOutputSamples);
-#endif
- }
-}
-
-
-#if 0
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_right_side__reference(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
- drflac_uint64 i;
- for (i = 0; i < frameCount; ++i) {
- int side = pInputSamples0[i] << (unusedBitsPerSample + pFlac->currentFrame.subframes[0].wastedBitsPerSample);
- int right = pInputSamples1[i] << (unusedBitsPerSample + pFlac->currentFrame.subframes[1].wastedBitsPerSample);
- int left = right + side;
-
- pOutputSamples[i*2+0] = (float)(left / 2147483648.0);
- pOutputSamples[i*2+1] = (float)(right / 2147483648.0);
- }
-}
-#endif
-
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_right_side__scalar(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
- drflac_uint64 i;
- drflac_uint64 frameCount4 = frameCount >> 2;
-
- float factor = 1 / 2147483648.0;
-
- drflac_int32 shift0 = unusedBitsPerSample + pFlac->currentFrame.subframes[0].wastedBitsPerSample;
- drflac_int32 shift1 = unusedBitsPerSample + pFlac->currentFrame.subframes[1].wastedBitsPerSample;
- for (i = 0; i < frameCount4; ++i) {
- drflac_int32 side0 = pInputSamples0[i*4+0] << shift0;
- drflac_int32 side1 = pInputSamples0[i*4+1] << shift0;
- drflac_int32 side2 = pInputSamples0[i*4+2] << shift0;
- drflac_int32 side3 = pInputSamples0[i*4+3] << shift0;
-
- drflac_int32 right0 = pInputSamples1[i*4+0] << shift1;
- drflac_int32 right1 = pInputSamples1[i*4+1] << shift1;
- drflac_int32 right2 = pInputSamples1[i*4+2] << shift1;
- drflac_int32 right3 = pInputSamples1[i*4+3] << shift1;
-
- drflac_int32 left0 = right0 + side0;
- drflac_int32 left1 = right1 + side1;
- drflac_int32 left2 = right2 + side2;
- drflac_int32 left3 = right3 + side3;
-
- pOutputSamples[i*8+0] = left0 * factor;
- pOutputSamples[i*8+1] = right0 * factor;
- pOutputSamples[i*8+2] = left1 * factor;
- pOutputSamples[i*8+3] = right1 * factor;
- pOutputSamples[i*8+4] = left2 * factor;
- pOutputSamples[i*8+5] = right2 * factor;
- pOutputSamples[i*8+6] = left3 * factor;
- pOutputSamples[i*8+7] = right3 * factor;
- }
-
- for (i = (frameCount4 << 2); i < frameCount; ++i) {
- int side = pInputSamples0[i] << shift0;
- int right = pInputSamples1[i] << shift1;
- int left = right + side;
-
- pOutputSamples[i*2+0] = (float)(left * factor);
- pOutputSamples[i*2+1] = (float)(right * factor);
- }
-}
-
-#if defined(DRFLAC_SUPPORT_SSE2)
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_right_side__sse2(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
- drflac_uint64 frameCount4;
- __m128 factor;
- int shift0;
- int shift1;
- drflac_uint64 i;
-
- drflac_assert(pFlac->bitsPerSample <= 24);
-
- frameCount4 = frameCount >> 2;
-
- factor = _mm_set1_ps(1.0f / 8388608.0f);
- shift0 = (unusedBitsPerSample + pFlac->currentFrame.subframes[0].wastedBitsPerSample) - 8;
- shift1 = (unusedBitsPerSample + pFlac->currentFrame.subframes[1].wastedBitsPerSample) - 8;
-
- for (i = 0; i < frameCount4; ++i) {
- __m128i inputSample0 = _mm_loadu_si128((const __m128i*)pInputSamples0 + i);
- __m128i inputSample1 = _mm_loadu_si128((const __m128i*)pInputSamples1 + i);
-
- __m128i side = _mm_slli_epi32(inputSample0, shift0);
- __m128i right = _mm_slli_epi32(inputSample1, shift1);
- __m128i left = _mm_add_epi32(right, side);
- __m128 leftf = _mm_mul_ps(_mm_cvtepi32_ps(left), factor);
- __m128 rightf = _mm_mul_ps(_mm_cvtepi32_ps(right), factor);
-
- pOutputSamples[i*8+0] = ((float*)&leftf)[0];
- pOutputSamples[i*8+1] = ((float*)&rightf)[0];
- pOutputSamples[i*8+2] = ((float*)&leftf)[1];
- pOutputSamples[i*8+3] = ((float*)&rightf)[1];
- pOutputSamples[i*8+4] = ((float*)&leftf)[2];
- pOutputSamples[i*8+5] = ((float*)&rightf)[2];
- pOutputSamples[i*8+6] = ((float*)&leftf)[3];
- pOutputSamples[i*8+7] = ((float*)&rightf)[3];
- }
-
- for (i = (frameCount4 << 2); i < frameCount; ++i) {
- int side = pInputSamples0[i] << shift0;
- int right = pInputSamples1[i] << shift1;
- int left = right + side;
-
- pOutputSamples[i*2+0] = (float)(left / 8388608.0f);
- pOutputSamples[i*2+1] = (float)(right / 8388608.0f);
- }
-}
-#endif
-
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_right_side(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
-#if defined(DRFLAC_SUPPORT_SSE2)
- if (drflac__gIsSSE2Supported && pFlac->bitsPerSample <= 24) {
- drflac_read_pcm_frames_f32__decode_right_side__sse2(pFlac, frameCount, unusedBitsPerSample, pInputSamples0, pInputSamples1, pOutputSamples);
- } else
-#endif
- {
- /* Scalar fallback. */
-#if 0
- drflac_read_pcm_frames_f32__decode_right_side__reference(pFlac, frameCount, unusedBitsPerSample, pInputSamples0, pInputSamples1, pOutputSamples);
-#else
- drflac_read_pcm_frames_f32__decode_right_side__scalar(pFlac, frameCount, unusedBitsPerSample, pInputSamples0, pInputSamples1, pOutputSamples);
-#endif
- }
-}
-
-
-#if 0
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_mid_side__reference(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
- for (drflac_uint64 i = 0; i < frameCount; ++i) {
- int mid = pInputSamples0[i] << pFlac->currentFrame.subframes[0].wastedBitsPerSample;
- int side = pInputSamples1[i] << pFlac->currentFrame.subframes[1].wastedBitsPerSample;
-
- mid = (((drflac_uint32)mid) << 1) | (side & 0x01);
-
- pOutputSamples[i*2+0] = (float)((((mid + side) >> 1) << (unusedBitsPerSample)) / 2147483648.0);
- pOutputSamples[i*2+1] = (float)((((mid - side) >> 1) << (unusedBitsPerSample)) / 2147483648.0);
- }
-}
-#endif
-
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_mid_side__scalar(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
- drflac_uint64 i;
- drflac_uint64 frameCount4 = frameCount >> 2;
-
- float factor = 1 / 2147483648.0;
-
- int shift = unusedBitsPerSample;
- if (shift > 0) {
- shift -= 1;
- for (i = 0; i < frameCount4; ++i) {
- int temp0L;
- int temp1L;
- int temp2L;
- int temp3L;
- int temp0R;
- int temp1R;
- int temp2R;
- int temp3R;
-
- int mid0 = pInputSamples0[i*4+0] << pFlac->currentFrame.subframes[0].wastedBitsPerSample;
- int mid1 = pInputSamples0[i*4+1] << pFlac->currentFrame.subframes[0].wastedBitsPerSample;
- int mid2 = pInputSamples0[i*4+2] << pFlac->currentFrame.subframes[0].wastedBitsPerSample;
- int mid3 = pInputSamples0[i*4+3] << pFlac->currentFrame.subframes[0].wastedBitsPerSample;
-
- int side0 = pInputSamples1[i*4+0] << pFlac->currentFrame.subframes[1].wastedBitsPerSample;
- int side1 = pInputSamples1[i*4+1] << pFlac->currentFrame.subframes[1].wastedBitsPerSample;
- int side2 = pInputSamples1[i*4+2] << pFlac->currentFrame.subframes[1].wastedBitsPerSample;
- int side3 = pInputSamples1[i*4+3] << pFlac->currentFrame.subframes[1].wastedBitsPerSample;
-
- mid0 = (((drflac_uint32)mid0) << 1) | (side0 & 0x01);
- mid1 = (((drflac_uint32)mid1) << 1) | (side1 & 0x01);
- mid2 = (((drflac_uint32)mid2) << 1) | (side2 & 0x01);
- mid3 = (((drflac_uint32)mid3) << 1) | (side3 & 0x01);
-
- temp0L = ((mid0 + side0) << shift);
- temp1L = ((mid1 + side1) << shift);
- temp2L = ((mid2 + side2) << shift);
- temp3L = ((mid3 + side3) << shift);
-
- temp0R = ((mid0 - side0) << shift);
- temp1R = ((mid1 - side1) << shift);
- temp2R = ((mid2 - side2) << shift);
- temp3R = ((mid3 - side3) << shift);
-
- pOutputSamples[i*8+0] = (float)(temp0L * factor);
- pOutputSamples[i*8+1] = (float)(temp0R * factor);
- pOutputSamples[i*8+2] = (float)(temp1L * factor);
- pOutputSamples[i*8+3] = (float)(temp1R * factor);
- pOutputSamples[i*8+4] = (float)(temp2L * factor);
- pOutputSamples[i*8+5] = (float)(temp2R * factor);
- pOutputSamples[i*8+6] = (float)(temp3L * factor);
- pOutputSamples[i*8+7] = (float)(temp3R * factor);
- }
- } else {
- for (i = 0; i < frameCount4; ++i) {
- int temp0L;
- int temp1L;
- int temp2L;
- int temp3L;
- int temp0R;
- int temp1R;
- int temp2R;
- int temp3R;
-
- int mid0 = pInputSamples0[i*4+0] << pFlac->currentFrame.subframes[0].wastedBitsPerSample;
- int mid1 = pInputSamples0[i*4+1] << pFlac->currentFrame.subframes[0].wastedBitsPerSample;
- int mid2 = pInputSamples0[i*4+2] << pFlac->currentFrame.subframes[0].wastedBitsPerSample;
- int mid3 = pInputSamples0[i*4+3] << pFlac->currentFrame.subframes[0].wastedBitsPerSample;
-
- int side0 = pInputSamples1[i*4+0] << pFlac->currentFrame.subframes[1].wastedBitsPerSample;
- int side1 = pInputSamples1[i*4+1] << pFlac->currentFrame.subframes[1].wastedBitsPerSample;
- int side2 = pInputSamples1[i*4+2] << pFlac->currentFrame.subframes[1].wastedBitsPerSample;
- int side3 = pInputSamples1[i*4+3] << pFlac->currentFrame.subframes[1].wastedBitsPerSample;
-
- mid0 = (((drflac_uint32)mid0) << 1) | (side0 & 0x01);
- mid1 = (((drflac_uint32)mid1) << 1) | (side1 & 0x01);
- mid2 = (((drflac_uint32)mid2) << 1) | (side2 & 0x01);
- mid3 = (((drflac_uint32)mid3) << 1) | (side3 & 0x01);
-
- temp0L = ((mid0 + side0) >> 1);
- temp1L = ((mid1 + side1) >> 1);
- temp2L = ((mid2 + side2) >> 1);
- temp3L = ((mid3 + side3) >> 1);
-
- temp0R = ((mid0 - side0) >> 1);
- temp1R = ((mid1 - side1) >> 1);
- temp2R = ((mid2 - side2) >> 1);
- temp3R = ((mid3 - side3) >> 1);
-
- pOutputSamples[i*8+0] = (float)(temp0L * factor);
- pOutputSamples[i*8+1] = (float)(temp0R * factor);
- pOutputSamples[i*8+2] = (float)(temp1L * factor);
- pOutputSamples[i*8+3] = (float)(temp1R * factor);
- pOutputSamples[i*8+4] = (float)(temp2L * factor);
- pOutputSamples[i*8+5] = (float)(temp2R * factor);
- pOutputSamples[i*8+6] = (float)(temp3L * factor);
- pOutputSamples[i*8+7] = (float)(temp3R * factor);
- }
- }
-
- for (i = (frameCount4 << 2); i < frameCount; ++i) {
- int mid = pInputSamples0[i] << pFlac->currentFrame.subframes[0].wastedBitsPerSample;
- int side = pInputSamples1[i] << pFlac->currentFrame.subframes[1].wastedBitsPerSample;
-
- mid = (((drflac_uint32)mid) << 1) | (side & 0x01);
-
- pOutputSamples[i*2+0] = (float)((((mid + side) >> 1) << unusedBitsPerSample) * factor);
- pOutputSamples[i*2+1] = (float)((((mid - side) >> 1) << unusedBitsPerSample) * factor);
- }
-}
-
-#if defined(DRFLAC_SUPPORT_SSE2)
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_mid_side__sse2(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
- drflac_uint64 i;
- drflac_uint64 frameCount4;
- float factor;
- int shift;
- __m128 factor128;
-
- drflac_assert(pFlac->bitsPerSample <= 24);
-
- frameCount4 = frameCount >> 2;
-
- factor = 1.0f / 8388608.0f;
- factor128 = _mm_set1_ps(1.0f / 8388608.0f);
-
- shift = unusedBitsPerSample - 8;
- if (shift == 0) {
- for (i = 0; i < frameCount4; ++i) {
- __m128i tempL;
- __m128i tempR;
- __m128 leftf;
- __m128 rightf;
-
- __m128i inputSample0 = _mm_loadu_si128((const __m128i*)pInputSamples0 + i);
- __m128i inputSample1 = _mm_loadu_si128((const __m128i*)pInputSamples1 + i);
-
- __m128i mid = _mm_slli_epi32(inputSample0, pFlac->currentFrame.subframes[0].wastedBitsPerSample);
- __m128i side = _mm_slli_epi32(inputSample1, pFlac->currentFrame.subframes[1].wastedBitsPerSample);
-
- mid = _mm_or_si128(_mm_slli_epi32(mid, 1), _mm_and_si128(side, _mm_set1_epi32(0x01)));
-
- tempL = _mm_add_epi32(mid, side);
- tempR = _mm_sub_epi32(mid, side);
-
- /* Signed bit shift. */
- tempL = _mm_or_si128(_mm_srli_epi32(tempL, 1), _mm_and_si128(tempL, _mm_set1_epi32(0x80000000)));
- tempR = _mm_or_si128(_mm_srli_epi32(tempR, 1), _mm_and_si128(tempR, _mm_set1_epi32(0x80000000)));
-
- leftf = _mm_mul_ps(_mm_cvtepi32_ps(tempL), factor128);
- rightf = _mm_mul_ps(_mm_cvtepi32_ps(tempR), factor128);
-
- pOutputSamples[i*8+0] = ((float*)&leftf)[0];
- pOutputSamples[i*8+1] = ((float*)&rightf)[0];
- pOutputSamples[i*8+2] = ((float*)&leftf)[1];
- pOutputSamples[i*8+3] = ((float*)&rightf)[1];
- pOutputSamples[i*8+4] = ((float*)&leftf)[2];
- pOutputSamples[i*8+5] = ((float*)&rightf)[2];
- pOutputSamples[i*8+6] = ((float*)&leftf)[3];
- pOutputSamples[i*8+7] = ((float*)&rightf)[3];
- }
-
- for (i = (frameCount4 << 2); i < frameCount; ++i) {
- int mid = pInputSamples0[i] << pFlac->currentFrame.subframes[0].wastedBitsPerSample;
- int side = pInputSamples1[i] << pFlac->currentFrame.subframes[1].wastedBitsPerSample;
-
- mid = (((drflac_uint32)mid) << 1) | (side & 0x01);
-
- pOutputSamples[i*2+0] = (float)(((mid + side) >> 1) * factor);
- pOutputSamples[i*2+1] = (float)(((mid - side) >> 1) * factor);
- }
- } else {
- for (i = 0; i < frameCount4; ++i) {
- __m128i inputSample0;
- __m128i inputSample1;
- __m128i mid;
- __m128i side;
- __m128i tempL;
- __m128i tempR;
- __m128 leftf;
- __m128 rightf;
-
- inputSample0 = _mm_loadu_si128((const __m128i*)pInputSamples0 + i);
- inputSample1 = _mm_loadu_si128((const __m128i*)pInputSamples1 + i);
-
- mid = _mm_slli_epi32(inputSample0, pFlac->currentFrame.subframes[0].wastedBitsPerSample);
- side = _mm_slli_epi32(inputSample1, pFlac->currentFrame.subframes[1].wastedBitsPerSample);
-
- mid = _mm_or_si128(_mm_slli_epi32(mid, 1), _mm_and_si128(side, _mm_set1_epi32(0x01)));
-
- tempL = _mm_slli_epi32(_mm_srli_epi32(_mm_add_epi32(mid, side), 1), shift);
- tempR = _mm_slli_epi32(_mm_srli_epi32(_mm_sub_epi32(mid, side), 1), shift);
-
- leftf = _mm_mul_ps(_mm_cvtepi32_ps(tempL), factor128);
- rightf = _mm_mul_ps(_mm_cvtepi32_ps(tempR), factor128);
-
- pOutputSamples[i*8+0] = ((float*)&leftf)[0];
- pOutputSamples[i*8+1] = ((float*)&rightf)[0];
- pOutputSamples[i*8+2] = ((float*)&leftf)[1];
- pOutputSamples[i*8+3] = ((float*)&rightf)[1];
- pOutputSamples[i*8+4] = ((float*)&leftf)[2];
- pOutputSamples[i*8+5] = ((float*)&rightf)[2];
- pOutputSamples[i*8+6] = ((float*)&leftf)[3];
- pOutputSamples[i*8+7] = ((float*)&rightf)[3];
- }
-
- for (i = (frameCount4 << 2); i < frameCount; ++i) {
- int mid = pInputSamples0[i] << pFlac->currentFrame.subframes[0].wastedBitsPerSample;
- int side = pInputSamples1[i] << pFlac->currentFrame.subframes[1].wastedBitsPerSample;
-
- mid = (((drflac_uint32)mid) << 1) | (side & 0x01);
-
- pOutputSamples[i*2+0] = (float)((((mid + side) >> 1) << shift) * factor);
- pOutputSamples[i*2+1] = (float)((((mid - side) >> 1) << shift) * factor);
- }
- }
-}
-#endif
-
-
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_mid_side(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
-#if defined(DRFLAC_SUPPORT_SSE2)
- if (drflac__gIsSSE2Supported && pFlac->bitsPerSample <= 24) {
- drflac_read_pcm_frames_f32__decode_mid_side__sse2(pFlac, frameCount, unusedBitsPerSample, pInputSamples0, pInputSamples1, pOutputSamples);
- } else
-#endif
- {
- /* Scalar fallback. */
-#if 0
- drflac_read_pcm_frames_f32__decode_mid_side__reference(pFlac, frameCount, unusedBitsPerSample, pInputSamples0, pInputSamples1, pOutputSamples);
-#else
- drflac_read_pcm_frames_f32__decode_mid_side__scalar(pFlac, frameCount, unusedBitsPerSample, pInputSamples0, pInputSamples1, pOutputSamples);
-#endif
- }
-}
-
-#if 0
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_independent_stereo__reference(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
- for (drflac_uint64 i = 0; i < frameCount; ++i) {
- pOutputSamples[i*2+0] = (float)((pInputSamples0[i] << (unusedBitsPerSample + pFlac->currentFrame.subframes[0].wastedBitsPerSample)) / 2147483648.0);
- pOutputSamples[i*2+1] = (float)((pInputSamples1[i] << (unusedBitsPerSample + pFlac->currentFrame.subframes[1].wastedBitsPerSample)) / 2147483648.0);
- }
-}
-#endif
-
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_independent_stereo__scalar(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
- drflac_uint64 i;
- drflac_uint64 frameCount4 = frameCount >> 2;
-
- float factor = 1 / 2147483648.0;
-
- int shift0 = (unusedBitsPerSample + pFlac->currentFrame.subframes[0].wastedBitsPerSample);
- int shift1 = (unusedBitsPerSample + pFlac->currentFrame.subframes[1].wastedBitsPerSample);
-
- for (i = 0; i < frameCount4; ++i) {
- int tempL0 = pInputSamples0[i*4+0] << shift0;
- int tempL1 = pInputSamples0[i*4+1] << shift0;
- int tempL2 = pInputSamples0[i*4+2] << shift0;
- int tempL3 = pInputSamples0[i*4+3] << shift0;
-
- int tempR0 = pInputSamples1[i*4+0] << shift1;
- int tempR1 = pInputSamples1[i*4+1] << shift1;
- int tempR2 = pInputSamples1[i*4+2] << shift1;
- int tempR3 = pInputSamples1[i*4+3] << shift1;
-
- pOutputSamples[i*8+0] = (float)(tempL0 * factor);
- pOutputSamples[i*8+1] = (float)(tempR0 * factor);
- pOutputSamples[i*8+2] = (float)(tempL1 * factor);
- pOutputSamples[i*8+3] = (float)(tempR1 * factor);
- pOutputSamples[i*8+4] = (float)(tempL2 * factor);
- pOutputSamples[i*8+5] = (float)(tempR2 * factor);
- pOutputSamples[i*8+6] = (float)(tempL3 * factor);
- pOutputSamples[i*8+7] = (float)(tempR3 * factor);
- }
-
- for (i = (frameCount4 << 2); i < frameCount; ++i) {
- pOutputSamples[i*2+0] = (float)((pInputSamples0[i] << shift0) * factor);
- pOutputSamples[i*2+1] = (float)((pInputSamples1[i] << shift1) * factor);
- }
-}
-
-#if defined(DRFLAC_SUPPORT_SSE2)
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_independent_stereo__sse2(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
- drflac_uint64 i;
- drflac_uint64 frameCount4 = frameCount >> 2;
-
- float factor = 1.0f / 8388608.0f;
- __m128 factor128 = _mm_set1_ps(1.0f / 8388608.0f);
-
- int shift0 = (unusedBitsPerSample + pFlac->currentFrame.subframes[0].wastedBitsPerSample) - 8;
- int shift1 = (unusedBitsPerSample + pFlac->currentFrame.subframes[1].wastedBitsPerSample) - 8;
-
- for (i = 0; i < frameCount4; ++i) {
- __m128i inputSample0 = _mm_loadu_si128((const __m128i*)pInputSamples0 + i);
- __m128i inputSample1 = _mm_loadu_si128((const __m128i*)pInputSamples1 + i);
-
- __m128i i32L = _mm_slli_epi32(inputSample0, shift0);
- __m128i i32R = _mm_slli_epi32(inputSample1, shift1);
-
- __m128 f32L = _mm_mul_ps(_mm_cvtepi32_ps(i32L), factor128);
- __m128 f32R = _mm_mul_ps(_mm_cvtepi32_ps(i32R), factor128);
-
- pOutputSamples[i*8+0] = ((float*)&f32L)[0];
- pOutputSamples[i*8+1] = ((float*)&f32R)[0];
- pOutputSamples[i*8+2] = ((float*)&f32L)[1];
- pOutputSamples[i*8+3] = ((float*)&f32R)[1];
- pOutputSamples[i*8+4] = ((float*)&f32L)[2];
- pOutputSamples[i*8+5] = ((float*)&f32R)[2];
- pOutputSamples[i*8+6] = ((float*)&f32L)[3];
- pOutputSamples[i*8+7] = ((float*)&f32R)[3];
- }
-
- for (i = (frameCount4 << 2); i < frameCount; ++i) {
- pOutputSamples[i*2+0] = (float)((pInputSamples0[i] << shift0) * factor);
- pOutputSamples[i*2+1] = (float)((pInputSamples1[i] << shift1) * factor);
- }
-}
-#endif
-
-static DRFLAC_INLINE void drflac_read_pcm_frames_f32__decode_independent_stereo(drflac* pFlac, drflac_uint64 frameCount, drflac_int32 unusedBitsPerSample, const drflac_int32* pInputSamples0, const drflac_int32* pInputSamples1, float* pOutputSamples)
-{
-#if defined(DRFLAC_SUPPORT_SSE2)
- if (drflac__gIsSSE2Supported && pFlac->bitsPerSample <= 24) {
- drflac_read_pcm_frames_f32__decode_independent_stereo__sse2(pFlac, frameCount, unusedBitsPerSample, pInputSamples0, pInputSamples1, pOutputSamples);
- } else
-#endif
- {
- /* Scalar fallback. */
-#if 0
- drflac_read_pcm_frames_f32__decode_independent_stereo__reference(pFlac, frameCount, unusedBitsPerSample, pInputSamples0, pInputSamples1, pOutputSamples);
-#else
- drflac_read_pcm_frames_f32__decode_independent_stereo__scalar(pFlac, frameCount, unusedBitsPerSample, pInputSamples0, pInputSamples1, pOutputSamples);
-#endif
- }
-}
-
-drflac_uint64 drflac_read_pcm_frames_f32(drflac* pFlac, drflac_uint64 framesToRead, float* pBufferOut)
-{
- drflac_uint64 framesRead;
-
- if (pFlac == NULL || framesToRead == 0) {
- return 0;
- }
-
- if (pBufferOut == NULL) {
- return drflac__seek_forward_by_pcm_frames(pFlac, framesToRead);
- }
-
- framesRead = 0;
- while (framesToRead > 0) {
- /* If we've run out of samples in this frame, go to the next. */
- if (pFlac->currentFrame.samplesRemaining == 0) {
- if (!drflac__read_and_decode_next_flac_frame(pFlac)) {
- break; /* Couldn't read the next frame, so just break from the loop and return. */
- }
- } else {
- unsigned int channelCount = drflac__get_channel_count_from_channel_assignment(pFlac->currentFrame.header.channelAssignment);
- drflac_uint64 totalFramesInPacket = pFlac->currentFrame.header.blockSize;
- drflac_uint64 framesReadFromPacketSoFar = totalFramesInPacket - (pFlac->currentFrame.samplesRemaining/channelCount);
- drflac_uint64 iFirstPCMFrame = framesReadFromPacketSoFar;
- drflac_int32 unusedBitsPerSample = 32 - pFlac->bitsPerSample;
- drflac_uint64 frameCountThisIteration = framesToRead;
- drflac_uint64 samplesReadThisIteration;
-
- if (frameCountThisIteration > pFlac->currentFrame.samplesRemaining / channelCount) {
- frameCountThisIteration = pFlac->currentFrame.samplesRemaining / channelCount;
- }
-
- if (channelCount == 2) {
- const drflac_int32* pDecodedSamples0 = pFlac->currentFrame.subframes[0].pDecodedSamples + iFirstPCMFrame;
- const drflac_int32* pDecodedSamples1 = pFlac->currentFrame.subframes[1].pDecodedSamples + iFirstPCMFrame;
-
- switch (pFlac->currentFrame.header.channelAssignment)
- {
- case DRFLAC_CHANNEL_ASSIGNMENT_LEFT_SIDE:
- {
- drflac_read_pcm_frames_f32__decode_left_side(pFlac, frameCountThisIteration, unusedBitsPerSample, pDecodedSamples0, pDecodedSamples1, pBufferOut);
- } break;
-
- case DRFLAC_CHANNEL_ASSIGNMENT_RIGHT_SIDE:
- {
- drflac_read_pcm_frames_f32__decode_right_side(pFlac, frameCountThisIteration, unusedBitsPerSample, pDecodedSamples0, pDecodedSamples1, pBufferOut);
- } break;
-
- case DRFLAC_CHANNEL_ASSIGNMENT_MID_SIDE:
- {
- drflac_read_pcm_frames_f32__decode_mid_side(pFlac, frameCountThisIteration, unusedBitsPerSample, pDecodedSamples0, pDecodedSamples1, pBufferOut);
- } break;
-
- case DRFLAC_CHANNEL_ASSIGNMENT_INDEPENDENT:
- default:
- {
- drflac_read_pcm_frames_f32__decode_independent_stereo(pFlac, frameCountThisIteration, unusedBitsPerSample, pDecodedSamples0, pDecodedSamples1, pBufferOut);
- } break;
- }
- } else {
- /* Generic interleaving. */
- drflac_uint64 i;
- for (i = 0; i < frameCountThisIteration; ++i) {
- unsigned int j;
- for (j = 0; j < channelCount; ++j) {
- pBufferOut[(i*channelCount)+j] = (float)(((pFlac->currentFrame.subframes[j].pDecodedSamples[iFirstPCMFrame + i]) << (unusedBitsPerSample + pFlac->currentFrame.subframes[j].wastedBitsPerSample)) / 2147483648.0);
- }
- }
- }
-
- samplesReadThisIteration = frameCountThisIteration * channelCount;
- framesRead += frameCountThisIteration;
- framesReadFromPacketSoFar += frameCountThisIteration;
- pBufferOut += samplesReadThisIteration;
- framesToRead -= frameCountThisIteration;
- pFlac->currentSample += samplesReadThisIteration;
- pFlac->currentFrame.samplesRemaining -= (unsigned int)samplesReadThisIteration;
- }
- }
-
- return framesRead;
-}
-
-drflac_bool32 drflac_seek_to_sample(drflac* pFlac, drflac_uint64 sampleIndex)
-{
- if (pFlac == NULL) {
- return DRFLAC_FALSE;
- }
-
- /*
- If we don't know where the first frame begins then we can't seek. This will happen when the STREAMINFO block was not present
- when the decoder was opened.
- */
- if (pFlac->firstFramePos == 0) {
- return DRFLAC_FALSE;
- }
-
- if (sampleIndex == 0) {
- pFlac->currentSample = 0;
- return drflac__seek_to_first_frame(pFlac);
- } else {
- drflac_bool32 wasSuccessful = DRFLAC_FALSE;
-
- /* Clamp the sample to the end. */
- if (sampleIndex >= pFlac->totalSampleCount) {
- sampleIndex = pFlac->totalSampleCount - 1;
- }
-
- /* If the target sample and the current sample are in the same frame we just move the position forward. */
- if (sampleIndex > pFlac->currentSample) {
- /* Forward. */
- drflac_uint32 offset = (drflac_uint32)(sampleIndex - pFlac->currentSample);
- if (pFlac->currentFrame.samplesRemaining > offset) {
- pFlac->currentFrame.samplesRemaining -= offset;
- pFlac->currentSample = sampleIndex;
- return DRFLAC_TRUE;
- }
- } else {
- /* Backward. */
- drflac_uint32 offsetAbs = (drflac_uint32)(pFlac->currentSample - sampleIndex);
- drflac_uint32 currentFrameSampleCount = pFlac->currentFrame.header.blockSize * drflac__get_channel_count_from_channel_assignment(pFlac->currentFrame.header.channelAssignment);
- drflac_uint32 currentFrameSamplesConsumed = (drflac_uint32)(currentFrameSampleCount - pFlac->currentFrame.samplesRemaining);
- if (currentFrameSamplesConsumed > offsetAbs) {
- pFlac->currentFrame.samplesRemaining += offsetAbs;
- pFlac->currentSample = sampleIndex;
- return DRFLAC_TRUE;
- }
- }
-
- /*
- Different techniques depending on encapsulation. Using the native FLAC seektable with Ogg encapsulation is a bit awkward so
- we'll instead use Ogg's natural seeking facility.
- */
-#ifndef DR_FLAC_NO_OGG
- if (pFlac->container == drflac_container_ogg)
- {
- wasSuccessful = drflac_ogg__seek_to_sample(pFlac, sampleIndex);
- }
- else
-#endif
- {
- /* First try seeking via the seek table. If this fails, fall back to a brute force seek which is much slower. */
- wasSuccessful = drflac__seek_to_sample__seek_table(pFlac, sampleIndex);
- if (!wasSuccessful) {
- wasSuccessful = drflac__seek_to_sample__brute_force(pFlac, sampleIndex);
- }
- }
-
- pFlac->currentSample = sampleIndex;
- return wasSuccessful;
- }
-}
-
-drflac_bool32 drflac_seek_to_pcm_frame(drflac* pFlac, drflac_uint64 pcmFrameIndex)
-{
- if (pFlac == NULL) {
- return DRFLAC_FALSE;
- }
-
- /*
- If we don't know where the first frame begins then we can't seek. This will happen when the STREAMINFO block was not present
- when the decoder was opened.
- */
- if (pFlac->firstFramePos == 0) {
- return DRFLAC_FALSE;
- }
-
- if (pcmFrameIndex == 0) {
- pFlac->currentSample = 0;
- return drflac__seek_to_first_frame(pFlac);
- } else {
- drflac_bool32 wasSuccessful = DRFLAC_FALSE;
-
- /* Clamp the sample to the end. */
- if (pcmFrameIndex >= pFlac->totalPCMFrameCount) {
- pcmFrameIndex = pFlac->totalPCMFrameCount - 1;
- }
-
- /* If the target sample and the current sample are in the same frame we just move the position forward. */
- if (pcmFrameIndex*pFlac->channels > pFlac->currentSample) {
- /* Forward. */
- drflac_uint32 offset = (drflac_uint32)(pcmFrameIndex*pFlac->channels - pFlac->currentSample);
- if (pFlac->currentFrame.samplesRemaining > offset) {
- pFlac->currentFrame.samplesRemaining -= offset;
- pFlac->currentSample = pcmFrameIndex*pFlac->channels;
- return DRFLAC_TRUE;
- }
- } else {
- /* Backward. */
- drflac_uint32 offsetAbs = (drflac_uint32)(pFlac->currentSample - pcmFrameIndex*pFlac->channels);
- drflac_uint32 currentFrameSampleCount = pFlac->currentFrame.header.blockSize * drflac__get_channel_count_from_channel_assignment(pFlac->currentFrame.header.channelAssignment);
- drflac_uint32 currentFrameSamplesConsumed = (drflac_uint32)(currentFrameSampleCount - pFlac->currentFrame.samplesRemaining);
- if (currentFrameSamplesConsumed > offsetAbs) {
- pFlac->currentFrame.samplesRemaining += offsetAbs;
- pFlac->currentSample = pcmFrameIndex*pFlac->channels;
- return DRFLAC_TRUE;
- }
- }
-
- /*
- Different techniques depending on encapsulation. Using the native FLAC seektable with Ogg encapsulation is a bit awkward so
- we'll instead use Ogg's natural seeking facility.
- */
-#ifndef DR_FLAC_NO_OGG
- if (pFlac->container == drflac_container_ogg)
- {
- wasSuccessful = drflac_ogg__seek_to_sample(pFlac, pcmFrameIndex*pFlac->channels);
- }
- else
-#endif
- {
- /* First try seeking via the seek table. If this fails, fall back to a brute force seek which is much slower. */
- wasSuccessful = drflac__seek_to_sample__seek_table(pFlac, pcmFrameIndex*pFlac->channels);
- if (!wasSuccessful) {
- wasSuccessful = drflac__seek_to_sample__brute_force(pFlac, pcmFrameIndex*pFlac->channels);
- }
- }
-
- pFlac->currentSample = pcmFrameIndex*pFlac->channels;
- return wasSuccessful;
- }
-}
-
-
-
-/* High Level APIs */
-
-#if defined(SIZE_MAX)
- #define DRFLAC_SIZE_MAX SIZE_MAX
-#else
- #if defined(DRFLAC_64BIT)
- #define DRFLAC_SIZE_MAX ((drflac_uint64)0xFFFFFFFFFFFFFFFF)
- #else
- #define DRFLAC_SIZE_MAX 0xFFFFFFFF
- #endif
-#endif
-
-
-/* Using a macro as the definition of the drflac__full_decode_and_close_*() API family. Sue me. */
-#define DRFLAC_DEFINE_FULL_READ_AND_CLOSE(extension, type) \
-static type* drflac__full_read_and_close_ ## extension (drflac* pFlac, unsigned int* channelsOut, unsigned int* sampleRateOut, drflac_uint64* totalPCMFrameCountOut)\
-{ \
- type* pSampleData = NULL; \
- drflac_uint64 totalPCMFrameCount; \
- \
- drflac_assert(pFlac != NULL); \
- \
- totalPCMFrameCount = pFlac->totalPCMFrameCount; \
- \
- if (totalPCMFrameCount == 0) { \
- type buffer[4096]; \
- drflac_uint64 pcmFramesRead; \
- size_t sampleDataBufferSize = sizeof(buffer); \
- \
- pSampleData = (type*)DRFLAC_MALLOC(sampleDataBufferSize); \
- if (pSampleData == NULL) { \
- goto on_error; \
- } \
- \
- while ((pcmFramesRead = (drflac_uint64)drflac_read_pcm_frames_##extension(pFlac, sizeof(buffer)/sizeof(buffer[0])/pFlac->channels, buffer)) > 0) { \
- if (((totalPCMFrameCount + pcmFramesRead) * pFlac->channels * sizeof(type)) > sampleDataBufferSize) { \
- type* pNewSampleData; \
- \
- sampleDataBufferSize *= 2; \
- pNewSampleData = (type*)DRFLAC_REALLOC(pSampleData, sampleDataBufferSize); \
- if (pNewSampleData == NULL) { \
- DRFLAC_FREE(pSampleData); \
- goto on_error; \
- } \
- \
- pSampleData = pNewSampleData; \
- } \
- \
- drflac_copy_memory(pSampleData + (totalPCMFrameCount*pFlac->channels), buffer, (size_t)(pcmFramesRead*pFlac->channels*sizeof(type))); \
- totalPCMFrameCount += pcmFramesRead; \
- } \
- \
- /* At this point everything should be decoded, but we just want to fill the unused part buffer with silence - need to \
- protect those ears from random noise! */ \
- drflac_zero_memory(pSampleData + (totalPCMFrameCount*pFlac->channels), (size_t)(sampleDataBufferSize - totalPCMFrameCount*pFlac->channels*sizeof(type))); \
- } else { \
- drflac_uint64 dataSize = totalPCMFrameCount*pFlac->channels*sizeof(type); \
- if (dataSize > DRFLAC_SIZE_MAX) { \
- goto on_error; /* The decoded data is too big. */ \
- } \
- \
- pSampleData = (type*)DRFLAC_MALLOC((size_t)dataSize); /* <-- Safe cast as per the check above. */ \
- if (pSampleData == NULL) { \
- goto on_error; \
- } \
- \
- totalPCMFrameCount = drflac_read_pcm_frames_##extension(pFlac, pFlac->totalPCMFrameCount, pSampleData); \
- } \
- \
- if (sampleRateOut) *sampleRateOut = pFlac->sampleRate; \
- if (channelsOut) *channelsOut = pFlac->channels; \
- if (totalPCMFrameCountOut) *totalPCMFrameCountOut = totalPCMFrameCount; \
- \
- drflac_close(pFlac); \
- return pSampleData; \
- \
-on_error: \
- drflac_close(pFlac); \
- return NULL; \
-}
-
-DRFLAC_DEFINE_FULL_READ_AND_CLOSE(s32, drflac_int32)
-DRFLAC_DEFINE_FULL_READ_AND_CLOSE(s16, drflac_int16)
-DRFLAC_DEFINE_FULL_READ_AND_CLOSE(f32, float)
-
-drflac_int32* drflac_open_and_read_pcm_frames_s32(drflac_read_proc onRead, drflac_seek_proc onSeek, void* pUserData, unsigned int* channelsOut, unsigned int* sampleRateOut, drflac_uint64* totalPCMFrameCountOut)
-{
- drflac* pFlac;
-
- if (channelsOut) {
- *channelsOut = 0;
- }
- if (sampleRateOut) {
- *sampleRateOut = 0;
- }
- if (totalPCMFrameCountOut) {
- *totalPCMFrameCountOut = 0;
- }
-
- pFlac = drflac_open(onRead, onSeek, pUserData);
- if (pFlac == NULL) {
- return NULL;
- }
-
- return drflac__full_read_and_close_s32(pFlac, channelsOut, sampleRateOut, totalPCMFrameCountOut);
-}
-
-drflac_int32* drflac_open_and_decode_s32(drflac_read_proc onRead, drflac_seek_proc onSeek, void* pUserData, unsigned int* channelsOut, unsigned int* sampleRateOut, drflac_uint64* totalSampleCountOut)
-{
- unsigned int channels;
- unsigned int sampleRate;
- drflac_uint64 totalPCMFrameCount;
- drflac_int32* pResult;
-
- if (channelsOut) {
- *channelsOut = 0;
- }
- if (sampleRateOut) {
- *sampleRateOut = 0;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = 0;
- }
-
- pResult = drflac_open_and_read_pcm_frames_s32(onRead, onSeek, pUserData, &channels, &sampleRate, &totalPCMFrameCount);
- if (pResult == NULL) {
- return NULL;
- }
-
- if (channelsOut) {
- *channelsOut = channels;
- }
- if (sampleRateOut) {
- *sampleRateOut = sampleRate;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = totalPCMFrameCount * channels;
- }
-
- return pResult;
-}
-
-
-
-drflac_int16* drflac_open_and_read_pcm_frames_s16(drflac_read_proc onRead, drflac_seek_proc onSeek, void* pUserData, unsigned int* channelsOut, unsigned int* sampleRateOut, drflac_uint64* totalPCMFrameCountOut)
-{
- drflac* pFlac;
-
- if (channelsOut) {
- *channelsOut = 0;
- }
- if (sampleRateOut) {
- *sampleRateOut = 0;
- }
- if (totalPCMFrameCountOut) {
- *totalPCMFrameCountOut = 0;
- }
-
- pFlac = drflac_open(onRead, onSeek, pUserData);
- if (pFlac == NULL) {
- return NULL;
- }
-
- return drflac__full_read_and_close_s16(pFlac, channelsOut, sampleRateOut, totalPCMFrameCountOut);
-}
-
-drflac_int16* drflac_open_and_decode_s16(drflac_read_proc onRead, drflac_seek_proc onSeek, void* pUserData, unsigned int* channelsOut, unsigned int* sampleRateOut, drflac_uint64* totalSampleCountOut)
-{
- unsigned int channels;
- unsigned int sampleRate;
- drflac_uint64 totalPCMFrameCount;
- drflac_int16* pResult;
-
- if (channelsOut) {
- *channelsOut = 0;
- }
- if (sampleRateOut) {
- *sampleRateOut = 0;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = 0;
- }
-
- pResult = drflac_open_and_read_pcm_frames_s16(onRead, onSeek, pUserData, &channels, &sampleRate, &totalPCMFrameCount);
- if (pResult == NULL) {
- return NULL;
- }
-
- if (channelsOut) {
- *channelsOut = channels;
- }
- if (sampleRateOut) {
- *sampleRateOut = sampleRate;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = totalPCMFrameCount * channels;
- }
-
- return pResult;
-}
-
-
-float* drflac_open_and_read_pcm_frames_f32(drflac_read_proc onRead, drflac_seek_proc onSeek, void* pUserData, unsigned int* channelsOut, unsigned int* sampleRateOut, drflac_uint64* totalPCMFrameCountOut)
-{
- drflac* pFlac;
-
- if (channelsOut) {
- *channelsOut = 0;
- }
- if (sampleRateOut) {
- *sampleRateOut = 0;
- }
- if (totalPCMFrameCountOut) {
- *totalPCMFrameCountOut = 0;
- }
-
- pFlac = drflac_open(onRead, onSeek, pUserData);
- if (pFlac == NULL) {
- return NULL;
- }
-
- return drflac__full_read_and_close_f32(pFlac, channelsOut, sampleRateOut, totalPCMFrameCountOut);
-}
-
-float* drflac_open_and_decode_f32(drflac_read_proc onRead, drflac_seek_proc onSeek, void* pUserData, unsigned int* channelsOut, unsigned int* sampleRateOut, drflac_uint64* totalSampleCountOut)
-{
- unsigned int channels;
- unsigned int sampleRate;
- drflac_uint64 totalPCMFrameCount;
- float* pResult;
-
- if (channelsOut) {
- *channelsOut = 0;
- }
- if (sampleRateOut) {
- *sampleRateOut = 0;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = 0;
- }
-
- pResult = drflac_open_and_read_pcm_frames_f32(onRead, onSeek, pUserData, &channels, &sampleRate, &totalPCMFrameCount);
- if (pResult == NULL) {
- return NULL;
- }
-
- if (channelsOut) {
- *channelsOut = channels;
- }
- if (sampleRateOut) {
- *sampleRateOut = sampleRate;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = totalPCMFrameCount * channels;
- }
-
- return pResult;
-}
-
-#ifndef DR_FLAC_NO_STDIO
-drflac_int32* drflac_open_file_and_read_pcm_frames_s32(const char* filename, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalPCMFrameCount)
-{
- drflac* pFlac;
-
- if (sampleRate) {
- *sampleRate = 0;
- }
- if (channels) {
- *channels = 0;
- }
- if (totalPCMFrameCount) {
- *totalPCMFrameCount = 0;
- }
-
- pFlac = drflac_open_file(filename);
- if (pFlac == NULL) {
- return NULL;
- }
-
- return drflac__full_read_and_close_s32(pFlac, channels, sampleRate, totalPCMFrameCount);
-}
-
-drflac_int32* drflac_open_and_decode_file_s32(const char* filename, unsigned int* channelsOut, unsigned int* sampleRateOut, drflac_uint64* totalSampleCountOut)
-{
- unsigned int channels;
- unsigned int sampleRate;
- drflac_uint64 totalPCMFrameCount;
- drflac_int32* pResult;
-
- if (channelsOut) {
- *channelsOut = 0;
- }
- if (sampleRateOut) {
- *sampleRateOut = 0;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = 0;
- }
-
- pResult = drflac_open_file_and_read_pcm_frames_s32(filename, &channels, &sampleRate, &totalPCMFrameCount);
- if (pResult == NULL) {
- return NULL;
- }
-
- if (channelsOut) {
- *channelsOut = channels;
- }
- if (sampleRateOut) {
- *sampleRateOut = sampleRate;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = totalPCMFrameCount * channels;
- }
-
- return pResult;
-}
-
-
-drflac_int16* drflac_open_file_and_read_pcm_frames_s16(const char* filename, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalPCMFrameCount)
-{
- drflac* pFlac;
-
- if (sampleRate) {
- *sampleRate = 0;
- }
- if (channels) {
- *channels = 0;
- }
- if (totalPCMFrameCount) {
- *totalPCMFrameCount = 0;
- }
-
- pFlac = drflac_open_file(filename);
- if (pFlac == NULL) {
- return NULL;
- }
-
- return drflac__full_read_and_close_s16(pFlac, channels, sampleRate, totalPCMFrameCount);
-}
-
-drflac_int16* drflac_open_and_decode_file_s16(const char* filename, unsigned int* channelsOut, unsigned int* sampleRateOut, drflac_uint64* totalSampleCountOut)
-{
- unsigned int channels;
- unsigned int sampleRate;
- drflac_uint64 totalPCMFrameCount;
- drflac_int16* pResult;
-
- if (channelsOut) {
- *channelsOut = 0;
- }
- if (sampleRateOut) {
- *sampleRateOut = 0;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = 0;
- }
-
- pResult = drflac_open_file_and_read_pcm_frames_s16(filename, &channels, &sampleRate, &totalPCMFrameCount);
- if (pResult == NULL) {
- return NULL;
- }
-
- if (channelsOut) {
- *channelsOut = channels;
- }
- if (sampleRateOut) {
- *sampleRateOut = sampleRate;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = totalPCMFrameCount * channels;
- }
-
- return pResult;
-}
-
-
-float* drflac_open_file_and_read_pcm_frames_f32(const char* filename, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalPCMFrameCount)
-{
- drflac* pFlac;
-
- if (sampleRate) {
- *sampleRate = 0;
- }
- if (channels) {
- *channels = 0;
- }
- if (totalPCMFrameCount) {
- *totalPCMFrameCount = 0;
- }
-
- pFlac = drflac_open_file(filename);
- if (pFlac == NULL) {
- return NULL;
- }
-
- return drflac__full_read_and_close_f32(pFlac, channels, sampleRate, totalPCMFrameCount);
-}
-
-float* drflac_open_and_decode_file_f32(const char* filename, unsigned int* channelsOut, unsigned int* sampleRateOut, drflac_uint64* totalSampleCountOut)
-{
- unsigned int channels;
- unsigned int sampleRate;
- drflac_uint64 totalPCMFrameCount;
- float* pResult;
-
- if (channelsOut) {
- *channelsOut = 0;
- }
- if (sampleRateOut) {
- *sampleRateOut = 0;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = 0;
- }
-
- pResult = drflac_open_file_and_read_pcm_frames_f32(filename, &channels, &sampleRate, &totalPCMFrameCount);
- if (pResult == NULL) {
- return NULL;
- }
-
- if (channelsOut) {
- *channelsOut = channels;
- }
- if (sampleRateOut) {
- *sampleRateOut = sampleRate;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = totalPCMFrameCount * channels;
- }
-
- return pResult;
-}
-#endif
-
-drflac_int32* drflac_open_memory_and_read_pcm_frames_s32(const void* data, size_t dataSize, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalPCMFrameCount)
-{
- drflac* pFlac;
-
- if (sampleRate) {
- *sampleRate = 0;
- }
- if (channels) {
- *channels = 0;
- }
- if (totalPCMFrameCount) {
- *totalPCMFrameCount = 0;
- }
-
- pFlac = drflac_open_memory(data, dataSize);
- if (pFlac == NULL) {
- return NULL;
- }
-
- return drflac__full_read_and_close_s32(pFlac, channels, sampleRate, totalPCMFrameCount);
-}
-
-drflac_int32* drflac_open_and_decode_memory_s32(const void* data, size_t dataSize, unsigned int* channelsOut, unsigned int* sampleRateOut, drflac_uint64* totalSampleCountOut)
-{
- unsigned int channels;
- unsigned int sampleRate;
- drflac_uint64 totalPCMFrameCount;
- drflac_int32* pResult;
-
- if (channelsOut) {
- *channelsOut = 0;
- }
- if (sampleRateOut) {
- *sampleRateOut = 0;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = 0;
- }
-
- pResult = drflac_open_memory_and_read_pcm_frames_s32(data, dataSize, &channels, &sampleRate, &totalPCMFrameCount);
- if (pResult == NULL) {
- return NULL;
- }
-
- if (channelsOut) {
- *channelsOut = channels;
- }
- if (sampleRateOut) {
- *sampleRateOut = sampleRate;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = totalPCMFrameCount * channels;
- }
-
- return pResult;
-}
-
-
-drflac_int16* drflac_open_memory_and_read_pcm_frames_s16(const void* data, size_t dataSize, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalPCMFrameCount)
-{
- drflac* pFlac;
-
- if (sampleRate) {
- *sampleRate = 0;
- }
- if (channels) {
- *channels = 0;
- }
- if (totalPCMFrameCount) {
- *totalPCMFrameCount = 0;
- }
-
- pFlac = drflac_open_memory(data, dataSize);
- if (pFlac == NULL) {
- return NULL;
- }
-
- return drflac__full_read_and_close_s16(pFlac, channels, sampleRate, totalPCMFrameCount);
-}
-
-drflac_int16* drflac_open_and_decode_memory_s16(const void* data, size_t dataSize, unsigned int* channelsOut, unsigned int* sampleRateOut, drflac_uint64* totalSampleCountOut)
-{
- unsigned int channels;
- unsigned int sampleRate;
- drflac_uint64 totalPCMFrameCount;
- drflac_int16* pResult;
-
- if (channelsOut) {
- *channelsOut = 0;
- }
- if (sampleRateOut) {
- *sampleRateOut = 0;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = 0;
- }
-
- pResult = drflac_open_memory_and_read_pcm_frames_s16(data, dataSize, &channels, &sampleRate, &totalPCMFrameCount);
- if (pResult == NULL) {
- return NULL;
- }
-
- if (channelsOut) {
- *channelsOut = channels;
- }
- if (sampleRateOut) {
- *sampleRateOut = sampleRate;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = totalPCMFrameCount * channels;
- }
-
- return pResult;
-}
-
-
-float* drflac_open_memory_and_read_pcm_frames_f32(const void* data, size_t dataSize, unsigned int* channels, unsigned int* sampleRate, drflac_uint64* totalPCMFrameCount)
-{
- drflac* pFlac;
-
- if (sampleRate) {
- *sampleRate = 0;
- }
- if (channels) {
- *channels = 0;
- }
- if (totalPCMFrameCount) {
- *totalPCMFrameCount = 0;
- }
-
- pFlac = drflac_open_memory(data, dataSize);
- if (pFlac == NULL) {
- return NULL;
- }
-
- return drflac__full_read_and_close_f32(pFlac, channels, sampleRate, totalPCMFrameCount);
-}
-
-float* drflac_open_and_decode_memory_f32(const void* data, size_t dataSize, unsigned int* channelsOut, unsigned int* sampleRateOut, drflac_uint64* totalSampleCountOut)
-{
- unsigned int channels;
- unsigned int sampleRate;
- drflac_uint64 totalPCMFrameCount;
- float* pResult;
-
- if (channelsOut) {
- *channelsOut = 0;
- }
- if (sampleRateOut) {
- *sampleRateOut = 0;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = 0;
- }
-
- pResult = drflac_open_memory_and_read_pcm_frames_f32(data, dataSize, &channels, &sampleRate, &totalPCMFrameCount);
- if (pResult == NULL) {
- return NULL;
- }
-
- if (channelsOut) {
- *channelsOut = channels;
- }
- if (sampleRateOut) {
- *sampleRateOut = sampleRate;
- }
- if (totalSampleCountOut) {
- *totalSampleCountOut = totalPCMFrameCount * channels;
- }
-
- return pResult;
-}
-
-
-void drflac_free(void* pSampleDataReturnedByOpenAndDecode)
-{
- DRFLAC_FREE(pSampleDataReturnedByOpenAndDecode);
-}
-
-
-
-
-void drflac_init_vorbis_comment_iterator(drflac_vorbis_comment_iterator* pIter, drflac_uint32 commentCount, const void* pComments)
-{
- if (pIter == NULL) {
- return;
- }
-
- pIter->countRemaining = commentCount;
- pIter->pRunningData = (const char*)pComments;
-}
-
-const char* drflac_next_vorbis_comment(drflac_vorbis_comment_iterator* pIter, drflac_uint32* pCommentLengthOut)
-{
- drflac_int32 length;
- const char* pComment;
-
- /* Safety. */
- if (pCommentLengthOut) {
- *pCommentLengthOut = 0;
- }
-
- if (pIter == NULL || pIter->countRemaining == 0 || pIter->pRunningData == NULL) {
- return NULL;
- }
-
- length = drflac__le2host_32(*(const drflac_uint32*)pIter->pRunningData);
- pIter->pRunningData += 4;
-
- pComment = pIter->pRunningData;
- pIter->pRunningData += length;
- pIter->countRemaining -= 1;
-
- if (pCommentLengthOut) {
- *pCommentLengthOut = length;
- }
-
- return pComment;
-}
-
-
-
-
-void drflac_init_cuesheet_track_iterator(drflac_cuesheet_track_iterator* pIter, drflac_uint32 trackCount, const void* pTrackData)
-{
- if (pIter == NULL) {
- return;
- }
-
- pIter->countRemaining = trackCount;
- pIter->pRunningData = (const char*)pTrackData;
-}
-
-drflac_bool32 drflac_next_cuesheet_track(drflac_cuesheet_track_iterator* pIter, drflac_cuesheet_track* pCuesheetTrack)
-{
- drflac_cuesheet_track cuesheetTrack;
- const char* pRunningData;
- drflac_uint64 offsetHi;
- drflac_uint64 offsetLo;
-
- if (pIter == NULL || pIter->countRemaining == 0 || pIter->pRunningData == NULL) {
- return DRFLAC_FALSE;
- }
-
- pRunningData = pIter->pRunningData;
-
- offsetHi = drflac__be2host_32(*(const drflac_uint32*)pRunningData); pRunningData += 4;
- offsetLo = drflac__be2host_32(*(const drflac_uint32*)pRunningData); pRunningData += 4;
- cuesheetTrack.offset = offsetLo | (offsetHi << 32);
- cuesheetTrack.trackNumber = pRunningData[0]; pRunningData += 1;
- drflac_copy_memory(cuesheetTrack.ISRC, pRunningData, sizeof(cuesheetTrack.ISRC)); pRunningData += 12;
- cuesheetTrack.isAudio = (pRunningData[0] & 0x80) != 0;
- cuesheetTrack.preEmphasis = (pRunningData[0] & 0x40) != 0; pRunningData += 14;
- cuesheetTrack.indexCount = pRunningData[0]; pRunningData += 1;
- cuesheetTrack.pIndexPoints = (const drflac_cuesheet_track_index*)pRunningData; pRunningData += cuesheetTrack.indexCount * sizeof(drflac_cuesheet_track_index);
-
- pIter->pRunningData = pRunningData;
- pIter->countRemaining -= 1;
-
- if (pCuesheetTrack) {
- *pCuesheetTrack = cuesheetTrack;
- }
-
- return DRFLAC_TRUE;
-}
-
-#if defined(__GNUC__)
- #pragma GCC diagnostic pop
-#endif
-#endif /* DR_FLAC_IMPLEMENTATION */
-
-
-/*
-REVISION HISTORY
-================
-v0.11.10 - 2019-06-26
- - Fix a compiler error.
-
-v0.11.9 - 2019-06-16
- - Silence some ThreadSanitizer warnings.
-
-v0.11.8 - 2019-05-21
- - Fix warnings.
-
-v0.11.7 - 2019-05-06
- - C89 fixes.
-
-v0.11.6 - 2019-05-05
- - Add support for C89.
- - Fix a compiler warning when CRC is disabled.
- - Change license to choice of public domain or MIT-0.
-
-v0.11.5 - 2019-04-19
- - Fix a compiler error with GCC.
-
-v0.11.4 - 2019-04-17
- - Fix some warnings with GCC when compiling with -std=c99.
-
-v0.11.3 - 2019-04-07
- - Silence warnings with GCC.
-
-v0.11.2 - 2019-03-10
- - Fix a warning.
-
-v0.11.1 - 2019-02-17
- - Fix a potential bug with seeking.
-
-v0.11.0 - 2018-12-16
- - API CHANGE: Deprecated drflac_read_s32(), drflac_read_s16() and drflac_read_f32() and replaced them with
- drflac_read_pcm_frames_s32(), drflac_read_pcm_frames_s16() and drflac_read_pcm_frames_f32(). The new APIs take
- and return PCM frame counts instead of sample counts. To upgrade you will need to change the input count by
- dividing it by the channel count, and then do the same with the return value.
- - API_CHANGE: Deprecated drflac_seek_to_sample() and replaced with drflac_seek_to_pcm_frame(). Same rules as
- the changes to drflac_read_*() apply.
- - API CHANGE: Deprecated drflac_open_and_decode_*() and replaced with drflac_open_*_and_read_*(). Same rules as
- the changes to drflac_read_*() apply.
- - Optimizations.
-
-v0.10.0 - 2018-09-11
- - Remove the DR_FLAC_NO_WIN32_IO option and the Win32 file IO functionality. If you need to use Win32 file IO you
- need to do it yourself via the callback API.
- - Fix the clang build.
- - Fix undefined behavior.
- - Fix errors with CUESHEET metdata blocks.
- - Add an API for iterating over each cuesheet track in the CUESHEET metadata block. This works the same way as the
- Vorbis comment API.
- - Other miscellaneous bug fixes, mostly relating to invalid FLAC streams.
- - Minor optimizations.
-
-v0.9.11 - 2018-08-29
- - Fix a bug with sample reconstruction.
-
-v0.9.10 - 2018-08-07
- - Improve 64-bit detection.
-
-v0.9.9 - 2018-08-05
- - Fix C++ build on older versions of GCC.
-
-v0.9.8 - 2018-07-24
- - Fix compilation errors.
-
-v0.9.7 - 2018-07-05
- - Fix a warning.
-
-v0.9.6 - 2018-06-29
- - Fix some typos.
-
-v0.9.5 - 2018-06-23
- - Fix some warnings.
-
-v0.9.4 - 2018-06-14
- - Optimizations to seeking.
- - Clean up.
-
-v0.9.3 - 2018-05-22
- - Bug fix.
-
-v0.9.2 - 2018-05-12
- - Fix a compilation error due to a missing break statement.
-
-v0.9.1 - 2018-04-29
- - Fix compilation error with Clang.
-
-v0.9 - 2018-04-24
- - Fix Clang build.
- - Start using major.minor.revision versioning.
-
-v0.8g - 2018-04-19
- - Fix build on non-x86/x64 architectures.
-
-v0.8f - 2018-02-02
- - Stop pretending to support changing rate/channels mid stream.
-
-v0.8e - 2018-02-01
- - Fix a crash when the block size of a frame is larger than the maximum block size defined by the FLAC stream.
- - Fix a crash the the Rice partition order is invalid.
-
-v0.8d - 2017-09-22
- - Add support for decoding streams with ID3 tags. ID3 tags are just skipped.
-
-v0.8c - 2017-09-07
- - Fix warning on non-x86/x64 architectures.
-
-v0.8b - 2017-08-19
- - Fix build on non-x86/x64 architectures.
-
-v0.8a - 2017-08-13
- - A small optimization for the Clang build.
-
-v0.8 - 2017-08-12
- - API CHANGE: Rename dr_* types to drflac_*.
- - Optimizations. This brings dr_flac back to about the same class of efficiency as the reference implementation.
- - Add support for custom implementations of malloc(), realloc(), etc.
- - Add CRC checking to Ogg encapsulated streams.
- - Fix VC++ 6 build. This is only for the C++ compiler. The C compiler is not currently supported.
- - Bug fixes.
-
-v0.7 - 2017-07-23
- - Add support for opening a stream without a header block. To do this, use drflac_open_relaxed() / drflac_open_with_metadata_relaxed().
-
-v0.6 - 2017-07-22
- - Add support for recovering from invalid frames. With this change, dr_flac will simply skip over invalid frames as if they
- never existed. Frames are checked against their sync code, the CRC-8 of the frame header and the CRC-16 of the whole frame.
-
-v0.5 - 2017-07-16
- - Fix typos.
- - Change drflac_bool* types to unsigned.
- - Add CRC checking. This makes dr_flac slower, but can be disabled with #define DR_FLAC_NO_CRC.
-
-v0.4f - 2017-03-10
- - Fix a couple of bugs with the bitstreaming code.
-
-v0.4e - 2017-02-17
- - Fix some warnings.
-
-v0.4d - 2016-12-26
- - Add support for 32-bit floating-point PCM decoding.
- - Use drflac_int* and drflac_uint* sized types to improve compiler support.
- - Minor improvements to documentation.
-
-v0.4c - 2016-12-26
- - Add support for signed 16-bit integer PCM decoding.
-
-v0.4b - 2016-10-23
- - A minor change to drflac_bool8 and drflac_bool32 types.
-
-v0.4a - 2016-10-11
- - Rename drBool32 to drflac_bool32 for styling consistency.
-
-v0.4 - 2016-09-29
- - API/ABI CHANGE: Use fixed size 32-bit booleans instead of the built-in bool type.
- - API CHANGE: Rename drflac_open_and_decode*() to drflac_open_and_decode*_s32().
- - API CHANGE: Swap the order of "channels" and "sampleRate" parameters in drflac_open_and_decode*(). Rationale for this is to
- keep it consistent with drflac_audio.
-
-v0.3f - 2016-09-21
- - Fix a warning with GCC.
-
-v0.3e - 2016-09-18
- - Fixed a bug where GCC 4.3+ was not getting properly identified.
- - Fixed a few typos.
- - Changed date formats to ISO 8601 (YYYY-MM-DD).
-
-v0.3d - 2016-06-11
- - Minor clean up.
-
-v0.3c - 2016-05-28
- - Fixed compilation error.
-
-v0.3b - 2016-05-16
- - Fixed Linux/GCC build.
- - Updated documentation.
-
-v0.3a - 2016-05-15
- - Minor fixes to documentation.
-
-v0.3 - 2016-05-11
- - Optimizations. Now at about parity with the reference implementation on 32-bit builds.
- - Lots of clean up.
-
-v0.2b - 2016-05-10
- - Bug fixes.
-
-v0.2a - 2016-05-10
- - Made drflac_open_and_decode() more robust.
- - Removed an unused debugging variable
-
-v0.2 - 2016-05-09
- - Added support for Ogg encapsulation.
- - API CHANGE. Have the onSeek callback take a third argument which specifies whether or not the seek
- should be relative to the start or the current position. Also changes the seeking rules such that
- seeking offsets will never be negative.
- - Have drflac_open_and_decode() fail gracefully if the stream has an unknown total sample count.
-
-v0.1b - 2016-05-07
- - Properly close the file handle in drflac_open_file() and family when the decoder fails to initialize.
- - Removed a stale comment.
-
-v0.1a - 2016-05-05
- - Minor formatting changes.
- - Fixed a warning on the GCC build.
-
-v0.1 - 2016-05-03
- - Initial versioned release.
-*/
-
-/*
-This software is available as a choice of the following licenses. Choose
-whichever you prefer.
-
-===============================================================================
-ALTERNATIVE 1 - Public Domain (www.unlicense.org)
-===============================================================================
-This is free and unencumbered software released into the public domain.
-
-Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
-software, either in source code form or as a compiled binary, for any purpose,
-commercial or non-commercial, and by any means.
-
-In jurisdictions that recognize copyright laws, the author or authors of this
-software dedicate any and all copyright interest in the software to the public
-domain. We make this dedication for the benefit of the public at large and to
-the detriment of our heirs and successors. We intend this dedication to be an
-overt act of relinquishment in perpetuity of all present and future rights to
-this software under copyright law.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
-ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-For more information, please refer to <http://unlicense.org/>
-
-===============================================================================
-ALTERNATIVE 2 - MIT No Attribution
-===============================================================================
-Copyright 2018 David Reid
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of
-this software and associated documentation files (the "Software"), to deal in
-the Software without restriction, including without limitation the rights to
-use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
-of the Software, and to permit persons to whom the Software is furnished to do
-so.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-*/
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