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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/stb_vorbis.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/stb_vorbis.h b/libs/raylib/src/external/stb_vorbis.h
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-// Ogg Vorbis audio decoder - v1.14 - public domain
-// http://nothings.org/stb_vorbis/
-//
-// Original version written by Sean Barrett in 2007.
-//
-// Originally sponsored by RAD Game Tools. Seeking implementation
-// sponsored by Phillip Bennefall, Marc Andersen, Aaron Baker,
-// Elias Software, Aras Pranckevicius, and Sean Barrett.
-//
-// LICENSE
-//
-// See end of file for license information.
-//
-// Limitations:
-//
-// - floor 0 not supported (used in old ogg vorbis files pre-2004)
-// - lossless sample-truncation at beginning ignored
-// - cannot concatenate multiple vorbis streams
-// - sample positions are 32-bit, limiting seekable 192Khz
-// files to around 6 hours (Ogg supports 64-bit)
-//
-// Feature contributors:
-// Dougall Johnson (sample-exact seeking)
-//
-// Bugfix/warning contributors:
-// Terje Mathisen Niklas Frykholm Andy Hill
-// Casey Muratori John Bolton Gargaj
-// Laurent Gomila Marc LeBlanc Ronny Chevalier
-// Bernhard Wodo Evan Balster alxprd@github
-// Tom Beaumont Ingo Leitgeb Nicolas Guillemot
-// Phillip Bennefall Rohit Thiago Goulart
-// manxorist@github saga musix github:infatum
-// Timur Gagiev BareRose
-//
-// Partial history:
-// 1.14 - 2018-02-11 - delete bogus dealloca usage
-// 1.13 - 2018-01-29 - fix truncation of last frame (hopefully)
-// 1.12 - 2017-11-21 - limit residue begin/end to blocksize/2 to avoid large temp allocs in bad/corrupt files
-// 1.11 - 2017-07-23 - fix MinGW compilation
-// 1.10 - 2017-03-03 - more robust seeking; fix negative stbv_ilog(); clear error in open_memory
-// 1.09 - 2016-04-04 - back out 'truncation of last frame' fix from previous version
-// 1.08 - 2016-04-02 - warnings; setup memory leaks; truncation of last frame
-// 1.07 - 2015-01-16 - fixes for crashes on invalid files; warning fixes; const
-// 1.06 - 2015-08-31 - full, correct support for seeking API (Dougall Johnson)
-// some crash fixes when out of memory or with corrupt files
-// fix some inappropriately signed shifts
-// 1.05 - 2015-04-19 - don't define __forceinline if it's redundant
-// 1.04 - 2014-08-27 - fix missing const-correct case in API
-// 1.03 - 2014-08-07 - warning fixes
-// 1.02 - 2014-07-09 - declare qsort comparison as explicitly _cdecl in Windows
-// 1.01 - 2014-06-18 - fix stb_vorbis_get_samples_float (interleaved was correct)
-// 1.0 - 2014-05-26 - fix memory leaks; fix warnings; fix bugs in >2-channel;
-// (API change) report sample rate for decode-full-file funcs
-//
-// See end of file for full version history.
-
-
-//////////////////////////////////////////////////////////////////////////////
-//
-// HEADER BEGINS HERE
-//
-
-#ifndef STB_VORBIS_INCLUDE_STB_VORBIS_H
-#define STB_VORBIS_INCLUDE_STB_VORBIS_H
-
-#if defined(STB_VORBIS_NO_CRT) && !defined(STB_VORBIS_NO_STDIO)
-#define STB_VORBIS_NO_STDIO
-#endif
-
-#ifndef STB_VORBIS_NO_STDIO
-#include <stdio.h>
-#endif
-
-// NOTE: Added to work with raylib on Android
-#if defined(PLATFORM_ANDROID)
- #include "utils.h" // Android fopen function map
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#ifdef STB_VORBIS_STATIC
-#define STBVDEF static
-#else
-#define STBVDEF extern
-#endif
-
-/////////// THREAD SAFETY
-
-// Individual stb_vorbis* handles are not thread-safe; you cannot decode from
-// them from multiple threads at the same time. However, you can have multiple
-// stb_vorbis* handles and decode from them independently in multiple thrads.
-
-
-/////////// MEMORY ALLOCATION
-
-// normally stb_vorbis uses malloc() to allocate memory at startup,
-// and alloca() to allocate temporary memory during a frame on the
-// stack. (Memory consumption will depend on the amount of setup
-// data in the file and how you set the compile flags for speed
-// vs. size. In my test files the maximal-size usage is ~150KB.)
-//
-// You can modify the wrapper functions in the source (stbv_setup_malloc,
-// stbv_setup_temp_malloc, temp_malloc) to change this behavior, or you
-// can use a simpler allocation model: you pass in a buffer from
-// which stb_vorbis will allocate _all_ its memory (including the
-// temp memory). "open" may fail with a VORBIS_outofmem if you
-// do not pass in enough data; there is no way to determine how
-// much you do need except to succeed (at which point you can
-// query get_info to find the exact amount required. yes I know
-// this is lame).
-//
-// If you pass in a non-NULL buffer of the type below, allocation
-// will occur from it as described above. Otherwise just pass NULL
-// to use malloc()/alloca()
-
-typedef struct
-{
- char *alloc_buffer;
- int alloc_buffer_length_in_bytes;
-} stb_vorbis_alloc;
-
-
-/////////// FUNCTIONS USEABLE WITH ALL INPUT MODES
-
-typedef struct stb_vorbis stb_vorbis;
-
-typedef struct
-{
- unsigned int sample_rate;
- int channels;
-
- unsigned int setup_memory_required;
- unsigned int setup_temp_memory_required;
- unsigned int temp_memory_required;
-
- int max_frame_size;
-} stb_vorbis_info;
-
-// get general information about the file
-STBVDEF stb_vorbis_info stb_vorbis_get_info(stb_vorbis *f);
-
-// get the last error detected (clears it, too)
-STBVDEF int stb_vorbis_get_error(stb_vorbis *f);
-
-// close an ogg vorbis file and free all memory in use
-STBVDEF void stb_vorbis_close(stb_vorbis *f);
-
-// this function returns the offset (in samples) from the beginning of the
-// file that will be returned by the next decode, if it is known, or -1
-// otherwise. after a flush_pushdata() call, this may take a while before
-// it becomes valid again.
-// NOT WORKING YET after a seek with PULLDATA API
-STBVDEF int stb_vorbis_get_sample_offset(stb_vorbis *f);
-
-// returns the current seek point within the file, or offset from the beginning
-// of the memory buffer. In pushdata mode it returns 0.
-STBVDEF unsigned int stb_vorbis_get_file_offset(stb_vorbis *f);
-
-/////////// PUSHDATA API
-
-#ifndef STB_VORBIS_NO_PUSHDATA_API
-
-// this API allows you to get blocks of data from any source and hand
-// them to stb_vorbis. you have to buffer them; stb_vorbis will tell
-// you how much it used, and you have to give it the rest next time;
-// and stb_vorbis may not have enough data to work with and you will
-// need to give it the same data again PLUS more. Note that the Vorbis
-// specification does not bound the size of an individual frame.
-
-STBVDEF stb_vorbis *stb_vorbis_open_pushdata(
- const unsigned char * datablock, int datablock_length_in_bytes,
- int *datablock_memory_consumed_in_bytes,
- int *error,
- const stb_vorbis_alloc *alloc_buffer);
-// create a vorbis decoder by passing in the initial data block containing
-// the ogg&vorbis headers (you don't need to do parse them, just provide
-// the first N bytes of the file--you're told if it's not enough, see below)
-// on success, returns an stb_vorbis *, does not set error, returns the amount of
-// data parsed/consumed on this call in *datablock_memory_consumed_in_bytes;
-// on failure, returns NULL on error and sets *error, does not change *datablock_memory_consumed
-// if returns NULL and *error is VORBIS_need_more_data, then the input block was
-// incomplete and you need to pass in a larger block from the start of the file
-
-STBVDEF int stb_vorbis_decode_frame_pushdata(
- stb_vorbis *f,
- const unsigned char *datablock, int datablock_length_in_bytes,
- int *channels, // place to write number of float * buffers
- float ***output, // place to write float ** array of float * buffers
- int *samples // place to write number of output samples
- );
-// decode a frame of audio sample data if possible from the passed-in data block
-//
-// return value: number of bytes we used from datablock
-//
-// possible cases:
-// 0 bytes used, 0 samples output (need more data)
-// N bytes used, 0 samples output (resynching the stream, keep going)
-// N bytes used, M samples output (one frame of data)
-// note that after opening a file, you will ALWAYS get one N-bytes,0-sample
-// frame, because Vorbis always "discards" the first frame.
-//
-// Note that on resynch, stb_vorbis will rarely consume all of the buffer,
-// instead only datablock_length_in_bytes-3 or less. This is because it wants
-// to avoid missing parts of a page header if they cross a datablock boundary,
-// without writing state-machiney code to record a partial detection.
-//
-// The number of channels returned are stored in *channels (which can be
-// NULL--it is always the same as the number of channels reported by
-// get_info). *output will contain an array of float* buffers, one per
-// channel. In other words, (*output)[0][0] contains the first sample from
-// the first channel, and (*output)[1][0] contains the first sample from
-// the second channel.
-
-STBVDEF void stb_vorbis_flush_pushdata(stb_vorbis *f);
-// inform stb_vorbis that your next datablock will not be contiguous with
-// previous ones (e.g. you've seeked in the data); future attempts to decode
-// frames will cause stb_vorbis to resynchronize (as noted above), and
-// once it sees a valid Ogg page (typically 4-8KB, as large as 64KB), it
-// will begin decoding the _next_ frame.
-//
-// if you want to seek using pushdata, you need to seek in your file, then
-// call stb_vorbis_flush_pushdata(), then start calling decoding, then once
-// decoding is returning you data, call stb_vorbis_get_sample_offset, and
-// if you don't like the result, seek your file again and repeat.
-#endif
-
-
-////////// PULLING INPUT API
-
-#ifndef STB_VORBIS_NO_PULLDATA_API
-// This API assumes stb_vorbis is allowed to pull data from a source--
-// either a block of memory containing the _entire_ vorbis stream, or a
-// FILE * that you or it create, or possibly some other reading mechanism
-// if you go modify the source to replace the FILE * case with some kind
-// of callback to your code. (But if you don't support seeking, you may
-// just want to go ahead and use pushdata.)
-
-#if !defined(STB_VORBIS_NO_STDIO) && !defined(STB_VORBIS_NO_INTEGER_CONVERSION)
-STBVDEF int stb_vorbis_decode_filename(const char *filename, int *channels, int *sample_rate, short **output);
-#endif
-#ifndef STB_VORBIS_NO_INTEGER_CONVERSION
-STBVDEF int stb_vorbis_decode_memory(const unsigned char *mem, int len, int *channels, int *sample_rate, short **output);
-#endif
-// decode an entire file and output the data interleaved into a malloc()ed
-// buffer stored in *output. The return value is the number of samples
-// decoded, or -1 if the file could not be opened or was not an ogg vorbis file.
-// When you're done with it, just free() the pointer returned in *output.
-
-STBVDEF stb_vorbis * stb_vorbis_open_memory(const unsigned char *data, int len,
- int *error, const stb_vorbis_alloc *alloc_buffer);
-// create an ogg vorbis decoder from an ogg vorbis stream in memory (note
-// this must be the entire stream!). on failure, returns NULL and sets *error
-
-#ifndef STB_VORBIS_NO_STDIO
-STBVDEF stb_vorbis * stb_vorbis_open_filename(const char *filename,
- int *error, const stb_vorbis_alloc *alloc_buffer);
-// create an ogg vorbis decoder from a filename via fopen(). on failure,
-// returns NULL and sets *error (possibly to VORBIS_file_open_failure).
-
-STBVDEF stb_vorbis * stb_vorbis_open_file(FILE *f, int close_handle_on_close,
- int *error, const stb_vorbis_alloc *alloc_buffer);
-// create an ogg vorbis decoder from an open FILE *, looking for a stream at
-// the _current_ seek point (ftell). on failure, returns NULL and sets *error.
-// note that stb_vorbis must "own" this stream; if you seek it in between
-// calls to stb_vorbis, it will become confused. Morever, if you attempt to
-// perform stb_vorbis_seek_*() operations on this file, it will assume it
-// owns the _entire_ rest of the file after the start point. Use the next
-// function, stb_vorbis_open_file_section(), to limit it.
-
-STBVDEF stb_vorbis * stb_vorbis_open_file_section(FILE *f, int close_handle_on_close,
- int *error, const stb_vorbis_alloc *alloc_buffer, unsigned int len);
-// create an ogg vorbis decoder from an open FILE *, looking for a stream at
-// the _current_ seek point (ftell); the stream will be of length 'len' bytes.
-// on failure, returns NULL and sets *error. note that stb_vorbis must "own"
-// this stream; if you seek it in between calls to stb_vorbis, it will become
-// confused.
-#endif
-
-STBVDEF int stb_vorbis_seek_frame(stb_vorbis *f, unsigned int sample_number);
-STBVDEF int stb_vorbis_seek(stb_vorbis *f, unsigned int sample_number);
-// these functions seek in the Vorbis file to (approximately) 'sample_number'.
-// after calling seek_frame(), the next call to get_frame_*() will include
-// the specified sample. after calling stb_vorbis_seek(), the next call to
-// stb_vorbis_get_samples_* will start with the specified sample. If you
-// do not need to seek to EXACTLY the target sample when using get_samples_*,
-// you can also use seek_frame().
-
-STBVDEF int stb_vorbis_seek_start(stb_vorbis *f);
-// this function is equivalent to stb_vorbis_seek(f,0)
-
-STBVDEF unsigned int stb_vorbis_stream_length_in_samples(stb_vorbis *f);
-STBVDEF float stb_vorbis_stream_length_in_seconds(stb_vorbis *f);
-// these functions return the total length of the vorbis stream
-
-STBVDEF int stb_vorbis_get_frame_float(stb_vorbis *f, int *channels, float ***output);
-// decode the next frame and return the number of samples. the number of
-// channels returned are stored in *channels (which can be NULL--it is always
-// the same as the number of channels reported by get_info). *output will
-// contain an array of float* buffers, one per channel. These outputs will
-// be overwritten on the next call to stb_vorbis_get_frame_*.
-//
-// You generally should not intermix calls to stb_vorbis_get_frame_*()
-// and stb_vorbis_get_samples_*(), since the latter calls the former.
-
-#ifndef STB_VORBIS_NO_INTEGER_CONVERSION
-STBVDEF int stb_vorbis_get_frame_short_interleaved(stb_vorbis *f, int num_c, short *buffer, int num_shorts);
-STBVDEF int stb_vorbis_get_frame_short (stb_vorbis *f, int num_c, short **buffer, int num_samples);
-#endif
-// decode the next frame and return the number of *samples* per channel.
-// Note that for interleaved data, you pass in the number of shorts (the
-// size of your array), but the return value is the number of samples per
-// channel, not the total number of samples.
-//
-// The data is coerced to the number of channels you request according to the
-// channel coercion rules (see below). You must pass in the size of your
-// buffer(s) so that stb_vorbis will not overwrite the end of the buffer.
-// The maximum buffer size needed can be gotten from get_info(); however,
-// the Vorbis I specification implies an absolute maximum of 4096 samples
-// per channel.
-
-// Channel coercion rules:
-// Let M be the number of channels requested, and N the number of channels present,
-// and Cn be the nth channel; let stereo L be the sum of all L and center channels,
-// and stereo R be the sum of all R and center channels (channel assignment from the
-// vorbis spec).
-// M N output
-// 1 k sum(Ck) for all k
-// 2 * stereo L, stereo R
-// k l k > l, the first l channels, then 0s
-// k l k <= l, the first k channels
-// Note that this is not _good_ surround etc. mixing at all! It's just so
-// you get something useful.
-
-STBVDEF int stb_vorbis_get_samples_float_interleaved(stb_vorbis *f, int channels, float *buffer, int num_floats);
-STBVDEF int stb_vorbis_get_samples_float(stb_vorbis *f, int channels, float **buffer, int num_samples);
-// gets num_samples samples, not necessarily on a frame boundary--this requires
-// buffering so you have to supply the buffers. DOES NOT APPLY THE COERCION RULES.
-// Returns the number of samples stored per channel; it may be less than requested
-// at the end of the file. If there are no more samples in the file, returns 0.
-
-#ifndef STB_VORBIS_NO_INTEGER_CONVERSION
-STBVDEF int stb_vorbis_get_samples_short_interleaved(stb_vorbis *f, int channels, short *buffer, int num_shorts);
-STBVDEF int stb_vorbis_get_samples_short(stb_vorbis *f, int channels, short **buffer, int num_samples);
-#endif
-// gets num_samples samples, not necessarily on a frame boundary--this requires
-// buffering so you have to supply the buffers. Applies the coercion rules above
-// to produce 'channels' channels. Returns the number of samples stored per channel;
-// it may be less than requested at the end of the file. If there are no more
-// samples in the file, returns 0.
-
-#endif
-
-//////// ERROR CODES
-
-enum STBVorbisError
-{
- VORBIS__no_error,
-
- VORBIS_need_more_data=1, // not a real error
-
- VORBIS_invalid_api_mixing, // can't mix API modes
- VORBIS_outofmem, // not enough memory
- VORBIS_feature_not_supported, // uses floor 0
- VORBIS_too_many_channels, // STB_VORBIS_MAX_CHANNELS is too small
- VORBIS_file_open_failure, // fopen() failed
- VORBIS_seek_without_length, // can't seek in unknown-length file
-
- VORBIS_unexpected_eof=10, // file is truncated?
- VORBIS_seek_invalid, // seek past EOF
-
- // decoding errors (corrupt/invalid stream) -- you probably
- // don't care about the exact details of these
-
- // vorbis errors:
- VORBIS_invalid_setup=20,
- VORBIS_invalid_stream,
-
- // ogg errors:
- VORBIS_missing_capture_pattern=30,
- VORBIS_invalid_stream_structure_version,
- VORBIS_continued_packet_flag_invalid,
- VORBIS_incorrect_stream_serial_number,
- VORBIS_invalid_first_page,
- VORBIS_bad_packet_type,
- VORBIS_cant_find_last_page,
- VORBIS_seek_failed
-};
-
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif // STB_VORBIS_INCLUDE_STB_VORBIS_H
-//
-// HEADER ENDS HERE
-//
-//////////////////////////////////////////////////////////////////////////////
-
-#ifdef STB_VORBIS_IMPLEMENTATION
-
-// global configuration settings (e.g. set these in the project/makefile),
-// or just set them in this file at the top (although ideally the first few
-// should be visible when the header file is compiled too, although it's not
-// crucial)
-
-// STB_VORBIS_NO_PUSHDATA_API
-// does not compile the code for the various stb_vorbis_*_pushdata()
-// functions
-// #define STB_VORBIS_NO_PUSHDATA_API
-
-// STB_VORBIS_NO_PULLDATA_API
-// does not compile the code for the non-pushdata APIs
-// #define STB_VORBIS_NO_PULLDATA_API
-
-// STB_VORBIS_NO_STDIO
-// does not compile the code for the APIs that use FILE *s internally
-// or externally (implied by STB_VORBIS_NO_PULLDATA_API)
-// #define STB_VORBIS_NO_STDIO
-
-// STB_VORBIS_NO_INTEGER_CONVERSION
-// does not compile the code for converting audio sample data from
-// float to integer (implied by STB_VORBIS_NO_PULLDATA_API)
-// #define STB_VORBIS_NO_INTEGER_CONVERSION
-
-// STB_VORBIS_NO_FAST_SCALED_FLOAT
-// does not use a fast float-to-int trick to accelerate float-to-int on
-// most platforms which requires endianness be defined correctly.
-// #define STB_VORBIS_NO_FAST_SCALED_FLOAT
-
-
-// STB_VORBIS_MAX_CHANNELS [number]
-// globally define this to the maximum number of channels you need.
-// The spec does not put a restriction on channels except that
-// the count is stored in a byte, so 255 is the hard limit.
-// Reducing this saves about 16 bytes per value, so using 16 saves
-// (255-16)*16 or around 4KB. Plus anything other memory usage
-// I forgot to account for. Can probably go as low as 8 (7.1 audio),
-// 6 (5.1 audio), or 2 (stereo only).
-#ifndef STB_VORBIS_MAX_CHANNELS
-#define STB_VORBIS_MAX_CHANNELS 16 // enough for anyone?
-#endif
-
-// STB_VORBIS_PUSHDATA_CRC_COUNT [number]
-// after a flush_pushdata(), stb_vorbis begins scanning for the
-// next valid page, without backtracking. when it finds something
-// that looks like a page, it streams through it and verifies its
-// CRC32. Should that validation fail, it keeps scanning. But it's
-// possible that _while_ streaming through to check the CRC32 of
-// one candidate page, it sees another candidate page. This #define
-// determines how many "overlapping" candidate pages it can search
-// at once. Note that "real" pages are typically ~4KB to ~8KB, whereas
-// garbage pages could be as big as 64KB, but probably average ~16KB.
-// So don't hose ourselves by scanning an apparent 64KB page and
-// missing a ton of real ones in the interim; so minimum of 2
-#ifndef STB_VORBIS_PUSHDATA_CRC_COUNT
-#define STB_VORBIS_PUSHDATA_CRC_COUNT 4
-#endif
-
-// STB_VORBIS_FAST_HUFFMAN_LENGTH [number]
-// sets the log size of the huffman-acceleration table. Maximum
-// supported value is 24. with larger numbers, more decodings are O(1),
-// but the table size is larger so worse cache missing, so you'll have
-// to probe (and try multiple ogg vorbis files) to find the sweet spot.
-#ifndef STB_VORBIS_FAST_HUFFMAN_LENGTH
-#define STB_VORBIS_FAST_HUFFMAN_LENGTH 10
-#endif
-
-// STB_VORBIS_FAST_BINARY_LENGTH [number]
-// sets the log size of the binary-search acceleration table. this
-// is used in similar fashion to the fast-huffman size to set initial
-// parameters for the binary search
-
-// STB_VORBIS_FAST_HUFFMAN_INT
-// The fast huffman tables are much more efficient if they can be
-// stored as 16-bit results instead of 32-bit results. This restricts
-// the codebooks to having only 65535 possible outcomes, though.
-// (At least, accelerated by the huffman table.)
-#ifndef STB_VORBIS_FAST_HUFFMAN_INT
-#define STB_VORBIS_FAST_HUFFMAN_SHORT
-#endif
-
-// STB_VORBIS_NO_HUFFMAN_BINARY_SEARCH
-// If the 'fast huffman' search doesn't succeed, then stb_vorbis falls
-// back on binary searching for the correct one. This requires storing
-// extra tables with the huffman codes in sorted order. Defining this
-// symbol trades off space for speed by forcing a linear search in the
-// non-fast case, except for "sparse" codebooks.
-// #define STB_VORBIS_NO_HUFFMAN_BINARY_SEARCH
-
-// STB_VORBIS_DIVIDES_IN_RESIDUE
-// stb_vorbis precomputes the result of the scalar residue decoding
-// that would otherwise require a divide per chunk. you can trade off
-// space for time by defining this symbol.
-// #define STB_VORBIS_DIVIDES_IN_RESIDUE
-
-// STB_VORBIS_DIVIDES_IN_CODEBOOK
-// vorbis VQ codebooks can be encoded two ways: with every case explicitly
-// stored, or with all elements being chosen from a small range of values,
-// and all values possible in all elements. By default, stb_vorbis expands
-// this latter kind out to look like the former kind for ease of decoding,
-// because otherwise an integer divide-per-vector-element is required to
-// unpack the index. If you define STB_VORBIS_DIVIDES_IN_CODEBOOK, you can
-// trade off storage for speed.
-//#define STB_VORBIS_DIVIDES_IN_CODEBOOK
-
-#ifdef STB_VORBIS_CODEBOOK_SHORTS
-#error "STB_VORBIS_CODEBOOK_SHORTS is no longer supported as it produced incorrect results for some input formats"
-#endif
-
-// STB_VORBIS_DIVIDE_TABLE
-// this replaces small integer divides in the floor decode loop with
-// table lookups. made less than 1% difference, so disabled by default.
-
-// STB_VORBIS_NO_INLINE_DECODE
-// disables the inlining of the scalar codebook fast-huffman decode.
-// might save a little codespace; useful for debugging
-// #define STB_VORBIS_NO_INLINE_DECODE
-
-// STB_VORBIS_NO_DEFER_FLOOR
-// Normally we only decode the floor without synthesizing the actual
-// full curve. We can instead synthesize the curve immediately. This
-// requires more memory and is very likely slower, so I don't think
-// you'd ever want to do it except for debugging.
-// #define STB_VORBIS_NO_DEFER_FLOOR
-
-
-
-
-//////////////////////////////////////////////////////////////////////////////
-
-#ifdef STB_VORBIS_NO_PULLDATA_API
- #define STB_VORBIS_NO_INTEGER_CONVERSION
- #define STB_VORBIS_NO_STDIO
-#endif
-
-#if defined(STB_VORBIS_NO_CRT) && !defined(STB_VORBIS_NO_STDIO)
- #define STB_VORBIS_NO_STDIO 1
-#endif
-
-#ifndef STB_VORBIS_NO_INTEGER_CONVERSION
-#ifndef STB_VORBIS_NO_FAST_SCALED_FLOAT
-
- // only need endianness for fast-float-to-int, which we don't
- // use for pushdata
-
- #ifndef STB_VORBIS_BIG_ENDIAN
- #define STB_VORBIS_ENDIAN 0
- #else
- #define STB_VORBIS_ENDIAN 1
- #endif
-
-#endif
-#endif
-
-
-#ifndef STB_VORBIS_NO_STDIO
-#include <stdio.h>
-#endif
-
-#ifndef STB_VORBIS_NO_CRT
- #include <stdlib.h>
- #include <string.h>
- #include <assert.h>
- #include <math.h>
-
- // find definition of alloca if it's not in stdlib.h:
- #if defined(_MSC_VER) || defined(__MINGW32__)
- #include <malloc.h>
- #endif
- #if defined(__linux__) || defined(__linux) || defined(__EMSCRIPTEN__)
- #include <alloca.h>
- #endif
-#else // STB_VORBIS_NO_CRT
- #define NULL 0
- #define malloc(s) 0
- #define free(s) ((void) 0)
- #define realloc(s) 0
-#endif // STB_VORBIS_NO_CRT
-
-#include <limits.h>
-
-#ifdef __MINGW32__
- // eff you mingw:
- // "fixed":
- // http://sourceforge.net/p/mingw-w64/mailman/message/32882927/
- // "no that broke the build, reverted, who cares about C":
- // http://sourceforge.net/p/mingw-w64/mailman/message/32890381/
- #ifdef __forceinline
- #undef __forceinline
- #endif
- #define __forceinline
- #ifndef alloca
- #define alloca(s) __builtin_alloca(s)
- #endif
-#elif !defined(_MSC_VER)
- #if __GNUC__
- #define __forceinline inline
- #else
- #define __forceinline
- #endif
-#endif
-
-#if STB_VORBIS_MAX_CHANNELS > 256
-#error "Value of STB_VORBIS_MAX_CHANNELS outside of allowed range"
-#endif
-
-#if STB_VORBIS_FAST_HUFFMAN_LENGTH > 24
-#error "Value of STB_VORBIS_FAST_HUFFMAN_LENGTH outside of allowed range"
-#endif
-
-
-#if 0
-#include <crtdbg.h>
-#define STBV_CHECK(f) _CrtIsValidHeapPointer(f->channel_buffers[1])
-#else
-#define STBV_CHECK(f) ((void) 0)
-#endif
-
-#define STBV_MAX_BLOCKSIZE_LOG 13 // from specification
-#define STBV_MAX_BLOCKSIZE (1 << STBV_MAX_BLOCKSIZE_LOG)
-
-
-typedef unsigned char stbv_uint8;
-typedef signed char stbv_int8;
-typedef unsigned short stbv_uint16;
-typedef signed short stbv_int16;
-typedef unsigned int stbv_uint32;
-typedef signed int stbv_int32;
-
-#ifndef TRUE
-#define TRUE 1
-#define FALSE 0
-#endif
-
-typedef float stbv_codetype;
-
-// @NOTE
-//
-// Some arrays below are tagged "//varies", which means it's actually
-// a variable-sized piece of data, but rather than malloc I assume it's
-// small enough it's better to just allocate it all together with the
-// main thing
-//
-// Most of the variables are specified with the smallest size I could pack
-// them into. It might give better performance to make them all full-sized
-// integers. It should be safe to freely rearrange the structures or change
-// the sizes larger--nothing relies on silently truncating etc., nor the
-// order of variables.
-
-#define STBV_FAST_HUFFMAN_TABLE_SIZE (1 << STB_VORBIS_FAST_HUFFMAN_LENGTH)
-#define STBV_FAST_HUFFMAN_TABLE_MASK (STBV_FAST_HUFFMAN_TABLE_SIZE - 1)
-
-typedef struct
-{
- int dimensions, entries;
- stbv_uint8 *codeword_lengths;
- float minimum_value;
- float delta_value;
- stbv_uint8 value_bits;
- stbv_uint8 lookup_type;
- stbv_uint8 sequence_p;
- stbv_uint8 sparse;
- stbv_uint32 lookup_values;
- stbv_codetype *multiplicands;
- stbv_uint32 *codewords;
- #ifdef STB_VORBIS_FAST_HUFFMAN_SHORT
- stbv_int16 fast_huffman[STBV_FAST_HUFFMAN_TABLE_SIZE];
- #else
- stbv_int32 fast_huffman[STBV_FAST_HUFFMAN_TABLE_SIZE];
- #endif
- stbv_uint32 *sorted_codewords;
- int *sorted_values;
- int sorted_entries;
-} StbvCodebook;
-
-typedef struct
-{
- stbv_uint8 order;
- stbv_uint16 rate;
- stbv_uint16 bark_map_size;
- stbv_uint8 amplitude_bits;
- stbv_uint8 amplitude_offset;
- stbv_uint8 number_of_books;
- stbv_uint8 book_list[16]; // varies
-} StbvFloor0;
-
-typedef struct
-{
- stbv_uint8 partitions;
- stbv_uint8 partition_class_list[32]; // varies
- stbv_uint8 class_dimensions[16]; // varies
- stbv_uint8 class_subclasses[16]; // varies
- stbv_uint8 class_masterbooks[16]; // varies
- stbv_int16 subclass_books[16][8]; // varies
- stbv_uint16 Xlist[31*8+2]; // varies
- stbv_uint8 sorted_order[31*8+2];
- stbv_uint8 stbv_neighbors[31*8+2][2];
- stbv_uint8 floor1_multiplier;
- stbv_uint8 rangebits;
- int values;
-} StbvFloor1;
-
-typedef union
-{
- StbvFloor0 floor0;
- StbvFloor1 floor1;
-} StbvFloor;
-
-typedef struct
-{
- stbv_uint32 begin, end;
- stbv_uint32 part_size;
- stbv_uint8 classifications;
- stbv_uint8 classbook;
- stbv_uint8 **classdata;
- stbv_int16 (*residue_books)[8];
-} StbvResidue;
-
-typedef struct
-{
- stbv_uint8 magnitude;
- stbv_uint8 angle;
- stbv_uint8 mux;
-} StbvMappingChannel;
-
-typedef struct
-{
- stbv_uint16 coupling_steps;
- StbvMappingChannel *chan;
- stbv_uint8 submaps;
- stbv_uint8 submap_floor[15]; // varies
- stbv_uint8 submap_residue[15]; // varies
-} StbvMapping;
-
-typedef struct
-{
- stbv_uint8 blockflag;
- stbv_uint8 mapping;
- stbv_uint16 windowtype;
- stbv_uint16 transformtype;
-} StbvMode;
-
-typedef struct
-{
- stbv_uint32 goal_crc; // expected crc if match
- int bytes_left; // bytes left in packet
- stbv_uint32 crc_so_far; // running crc
- int bytes_done; // bytes processed in _current_ chunk
- stbv_uint32 sample_loc; // granule pos encoded in page
-} StbvCRCscan;
-
-typedef struct
-{
- stbv_uint32 page_start, page_end;
- stbv_uint32 last_decoded_sample;
-} StbvProbedPage;
-
-struct stb_vorbis
-{
- // user-accessible info
- unsigned int sample_rate;
- int channels;
-
- unsigned int setup_memory_required;
- unsigned int temp_memory_required;
- unsigned int setup_temp_memory_required;
-
- // input config
-#ifndef STB_VORBIS_NO_STDIO
- FILE *f;
- stbv_uint32 f_start;
- int close_on_free;
-#endif
-
- stbv_uint8 *stream;
- stbv_uint8 *stream_start;
- stbv_uint8 *stream_end;
-
- stbv_uint32 stream_len;
-
- stbv_uint8 push_mode;
-
- stbv_uint32 first_audio_page_offset;
-
- StbvProbedPage p_first, p_last;
-
- // memory management
- stb_vorbis_alloc alloc;
- int setup_offset;
- int temp_offset;
-
- // run-time results
- int eof;
- enum STBVorbisError error;
-
- // user-useful data
-
- // header info
- int blocksize[2];
- int blocksize_0, blocksize_1;
- int codebook_count;
- StbvCodebook *codebooks;
- int floor_count;
- stbv_uint16 floor_types[64]; // varies
- StbvFloor *floor_config;
- int residue_count;
- stbv_uint16 residue_types[64]; // varies
- StbvResidue *residue_config;
- int mapping_count;
- StbvMapping *mapping;
- int mode_count;
- StbvMode mode_config[64]; // varies
-
- stbv_uint32 total_samples;
-
- // decode buffer
- float *channel_buffers[STB_VORBIS_MAX_CHANNELS];
- float *outputs [STB_VORBIS_MAX_CHANNELS];
-
- float *previous_window[STB_VORBIS_MAX_CHANNELS];
- int previous_length;
-
- #ifndef STB_VORBIS_NO_DEFER_FLOOR
- stbv_int16 *finalY[STB_VORBIS_MAX_CHANNELS];
- #else
- float *floor_buffers[STB_VORBIS_MAX_CHANNELS];
- #endif
-
- stbv_uint32 current_loc; // sample location of next frame to decode
- int current_loc_valid;
-
- // per-blocksize precomputed data
-
- // twiddle factors
- float *A[2],*B[2],*C[2];
- float *window[2];
- stbv_uint16 *stbv_bit_reverse[2];
-
- // current page/packet/segment streaming info
- stbv_uint32 serial; // stream serial number for verification
- int last_page;
- int segment_count;
- stbv_uint8 segments[255];
- stbv_uint8 page_flag;
- stbv_uint8 bytes_in_seg;
- stbv_uint8 first_decode;
- int next_seg;
- int last_seg; // flag that we're on the last segment
- int last_seg_which; // what was the segment number of the last seg?
- stbv_uint32 acc;
- int valid_bits;
- int packet_bytes;
- int end_seg_with_known_loc;
- stbv_uint32 known_loc_for_packet;
- int discard_samples_deferred;
- stbv_uint32 samples_output;
-
- // push mode scanning
- int page_crc_tests; // only in push_mode: number of tests active; -1 if not searching
-#ifndef STB_VORBIS_NO_PUSHDATA_API
- StbvCRCscan scan[STB_VORBIS_PUSHDATA_CRC_COUNT];
-#endif
-
- // sample-access
- int channel_buffer_start;
- int channel_buffer_end;
-};
-
-#if defined(STB_VORBIS_NO_PUSHDATA_API)
- #define STBV_IS_PUSH_MODE(f) FALSE
-#elif defined(STB_VORBIS_NO_PULLDATA_API)
- #define STBV_IS_PUSH_MODE(f) TRUE
-#else
- #define STBV_IS_PUSH_MODE(f) ((f)->push_mode)
-#endif
-
-typedef struct stb_vorbis stbv_vorb;
-
-static int stbv_error(stbv_vorb *f, enum STBVorbisError e)
-{
- f->error = e;
- if (!f->eof && e != VORBIS_need_more_data) {
- f->error=e; // breakpoint for debugging
- }
- return 0;
-}
-
-
-// these functions are used for allocating temporary memory
-// while decoding. if you can afford the stack space, use
-// alloca(); otherwise, provide a temp buffer and it will
-// allocate out of those.
-
-#define stbv_array_size_required(count,size) (count*(sizeof(void *)+(size)))
-
-#define stbv_temp_alloc(f,size) (f->alloc.alloc_buffer ? stbv_setup_temp_malloc(f,size) : alloca(size))
-#define stbv_temp_free(f,p) 0
-#define stbv_temp_alloc_save(f) ((f)->temp_offset)
-#define stbv_temp_alloc_restore(f,p) ((f)->temp_offset = (p))
-
-#define stbv_temp_block_array(f,count,size) stbv_make_block_array(stbv_temp_alloc(f,stbv_array_size_required(count,size)), count, size)
-
-// given a sufficiently large block of memory, make an array of pointers to subblocks of it
-static void *stbv_make_block_array(void *mem, int count, int size)
-{
- int i;
- void ** p = (void **) mem;
- char *q = (char *) (p + count);
- for (i=0; i < count; ++i) {
- p[i] = q;
- q += size;
- }
- return p;
-}
-
-static void *stbv_setup_malloc(stbv_vorb *f, int sz)
-{
- sz = (sz+3) & ~3;
- f->setup_memory_required += sz;
- if (f->alloc.alloc_buffer) {
- void *p = (char *) f->alloc.alloc_buffer + f->setup_offset;
- if (f->setup_offset + sz > f->temp_offset) return NULL;
- f->setup_offset += sz;
- return p;
- }
- return sz ? malloc(sz) : NULL;
-}
-
-static void stbv_setup_free(stbv_vorb *f, void *p)
-{
- if (f->alloc.alloc_buffer) return; // do nothing; setup mem is a stack
- free(p);
-}
-
-static void *stbv_setup_temp_malloc(stbv_vorb *f, int sz)
-{
- sz = (sz+3) & ~3;
- if (f->alloc.alloc_buffer) {
- if (f->temp_offset - sz < f->setup_offset) return NULL;
- f->temp_offset -= sz;
- return (char *) f->alloc.alloc_buffer + f->temp_offset;
- }
- return malloc(sz);
-}
-
-static void stbv_setup_temp_free(stbv_vorb *f, void *p, int sz)
-{
- if (f->alloc.alloc_buffer) {
- f->temp_offset += (sz+3)&~3;
- return;
- }
- free(p);
-}
-
-#define STBV_CRC32_POLY 0x04c11db7 // from spec
-
-static stbv_uint32 stbv_crc_table[256];
-static void stbv_crc32_init(void)
-{
- int i,j;
- stbv_uint32 s;
- for(i=0; i < 256; i++) {
- for (s=(stbv_uint32) i << 24, j=0; j < 8; ++j)
- s = (s << 1) ^ (s >= (1U<<31) ? STBV_CRC32_POLY : 0);
- stbv_crc_table[i] = s;
- }
-}
-
-static __forceinline stbv_uint32 stbv_crc32_update(stbv_uint32 crc, stbv_uint8 byte)
-{
- return (crc << 8) ^ stbv_crc_table[byte ^ (crc >> 24)];
-}
-
-
-// used in setup, and for huffman that doesn't go fast path
-static unsigned int stbv_bit_reverse(unsigned int n)
-{
- n = ((n & 0xAAAAAAAA) >> 1) | ((n & 0x55555555) << 1);
- n = ((n & 0xCCCCCCCC) >> 2) | ((n & 0x33333333) << 2);
- n = ((n & 0xF0F0F0F0) >> 4) | ((n & 0x0F0F0F0F) << 4);
- n = ((n & 0xFF00FF00) >> 8) | ((n & 0x00FF00FF) << 8);
- return (n >> 16) | (n << 16);
-}
-
-static float stbv_square(float x)
-{
- return x*x;
-}
-
-// this is a weird definition of log2() for which log2(1) = 1, log2(2) = 2, log2(4) = 3
-// as required by the specification. fast(?) implementation from stb.h
-// @OPTIMIZE: called multiple times per-packet with "constants"; move to setup
-static int stbv_ilog(stbv_int32 n)
-{
- static signed char log2_4[16] = { 0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4 };
-
- if (n < 0) return 0; // signed n returns 0
-
- // 2 compares if n < 16, 3 compares otherwise (4 if signed or n > 1<<29)
- if (n < (1 << 14))
- if (n < (1 << 4)) return 0 + log2_4[n ];
- else if (n < (1 << 9)) return 5 + log2_4[n >> 5];
- else return 10 + log2_4[n >> 10];
- else if (n < (1 << 24))
- if (n < (1 << 19)) return 15 + log2_4[n >> 15];
- else return 20 + log2_4[n >> 20];
- else if (n < (1 << 29)) return 25 + log2_4[n >> 25];
- else return 30 + log2_4[n >> 30];
-}
-
-#ifndef M_PI
- #define M_PI 3.14159265358979323846264f // from CRC
-#endif
-
-// code length assigned to a value with no huffman encoding
-#define NO_CODE 255
-
-/////////////////////// LEAF SETUP FUNCTIONS //////////////////////////
-//
-// these functions are only called at setup, and only a few times
-// per file
-
-static float stbv_float32_unpack(stbv_uint32 x)
-{
- // from the specification
- stbv_uint32 mantissa = x & 0x1fffff;
- stbv_uint32 sign = x & 0x80000000;
- stbv_uint32 exp = (x & 0x7fe00000) >> 21;
- double res = sign ? -(double)mantissa : (double)mantissa;
- return (float) ldexp((float)res, exp-788);
-}
-
-
-// zlib & jpeg huffman tables assume that the output symbols
-// can either be arbitrarily arranged, or have monotonically
-// increasing frequencies--they rely on the lengths being sorted;
-// this makes for a very simple generation algorithm.
-// vorbis allows a huffman table with non-sorted lengths. This
-// requires a more sophisticated construction, since symbols in
-// order do not map to huffman codes "in order".
-static void stbv_add_entry(StbvCodebook *c, stbv_uint32 huff_code, int symbol, int count, int len, stbv_uint32 *values)
-{
- if (!c->sparse) {
- c->codewords [symbol] = huff_code;
- } else {
- c->codewords [count] = huff_code;
- c->codeword_lengths[count] = len;
- values [count] = symbol;
- }
-}
-
-static int stbv_compute_codewords(StbvCodebook *c, stbv_uint8 *len, int n, stbv_uint32 *values)
-{
- int i,k,m=0;
- stbv_uint32 available[32];
-
- memset(available, 0, sizeof(available));
- // find the first entry
- for (k=0; k < n; ++k) if (len[k] < NO_CODE) break;
- if (k == n) { assert(c->sorted_entries == 0); return TRUE; }
- // add to the list
- stbv_add_entry(c, 0, k, m++, len[k], values);
- // add all available leaves
- for (i=1; i <= len[k]; ++i)
- available[i] = 1U << (32-i);
- // note that the above code treats the first case specially,
- // but it's really the same as the following code, so they
- // could probably be combined (except the initial code is 0,
- // and I use 0 in available[] to mean 'empty')
- for (i=k+1; i < n; ++i) {
- stbv_uint32 res;
- int z = len[i], y;
- if (z == NO_CODE) continue;
- // find lowest available leaf (should always be earliest,
- // which is what the specification calls for)
- // note that this property, and the fact we can never have
- // more than one free leaf at a given level, isn't totally
- // trivial to prove, but it seems true and the assert never
- // fires, so!
- while (z > 0 && !available[z]) --z;
- if (z == 0) { return FALSE; }
- res = available[z];
- assert(z >= 0 && z < 32);
- available[z] = 0;
- stbv_add_entry(c, stbv_bit_reverse(res), i, m++, len[i], values);
- // propogate availability up the tree
- if (z != len[i]) {
- assert(len[i] >= 0 && len[i] < 32);
- for (y=len[i]; y > z; --y) {
- assert(available[y] == 0);
- available[y] = res + (1 << (32-y));
- }
- }
- }
- return TRUE;
-}
-
-// accelerated huffman table allows fast O(1) match of all symbols
-// of length <= STB_VORBIS_FAST_HUFFMAN_LENGTH
-static void stbv_compute_accelerated_huffman(StbvCodebook *c)
-{
- int i, len;
- for (i=0; i < STBV_FAST_HUFFMAN_TABLE_SIZE; ++i)
- c->fast_huffman[i] = -1;
-
- len = c->sparse ? c->sorted_entries : c->entries;
- #ifdef STB_VORBIS_FAST_HUFFMAN_SHORT
- if (len > 32767) len = 32767; // largest possible value we can encode!
- #endif
- for (i=0; i < len; ++i) {
- if (c->codeword_lengths[i] <= STB_VORBIS_FAST_HUFFMAN_LENGTH) {
- stbv_uint32 z = c->sparse ? stbv_bit_reverse(c->sorted_codewords[i]) : c->codewords[i];
- // set table entries for all bit combinations in the higher bits
- while (z < STBV_FAST_HUFFMAN_TABLE_SIZE) {
- c->fast_huffman[z] = i;
- z += 1 << c->codeword_lengths[i];
- }
- }
- }
-}
-
-#ifdef _MSC_VER
-#define STBV_CDECL __cdecl
-#else
-#define STBV_CDECL
-#endif
-
-static int STBV_CDECL stbv_uint32_compare(const void *p, const void *q)
-{
- stbv_uint32 x = * (stbv_uint32 *) p;
- stbv_uint32 y = * (stbv_uint32 *) q;
- return x < y ? -1 : x > y;
-}
-
-static int stbv_include_in_sort(StbvCodebook *c, stbv_uint8 len)
-{
- if (c->sparse) { assert(len != NO_CODE); return TRUE; }
- if (len == NO_CODE) return FALSE;
- if (len > STB_VORBIS_FAST_HUFFMAN_LENGTH) return TRUE;
- return FALSE;
-}
-
-// if the fast table above doesn't work, we want to binary
-// search them... need to reverse the bits
-static void stbv_compute_sorted_huffman(StbvCodebook *c, stbv_uint8 *lengths, stbv_uint32 *values)
-{
- int i, len;
- // build a list of all the entries
- // OPTIMIZATION: don't include the short ones, since they'll be caught by FAST_HUFFMAN.
- // this is kind of a frivolous optimization--I don't see any performance improvement,
- // but it's like 4 extra lines of code, so.
- if (!c->sparse) {
- int k = 0;
- for (i=0; i < c->entries; ++i)
- if (stbv_include_in_sort(c, lengths[i]))
- c->sorted_codewords[k++] = stbv_bit_reverse(c->codewords[i]);
- assert(k == c->sorted_entries);
- } else {
- for (i=0; i < c->sorted_entries; ++i)
- c->sorted_codewords[i] = stbv_bit_reverse(c->codewords[i]);
- }
-
- qsort(c->sorted_codewords, c->sorted_entries, sizeof(c->sorted_codewords[0]), stbv_uint32_compare);
- c->sorted_codewords[c->sorted_entries] = 0xffffffff;
-
- len = c->sparse ? c->sorted_entries : c->entries;
- // now we need to indicate how they correspond; we could either
- // #1: sort a different data structure that says who they correspond to
- // #2: for each sorted entry, search the original list to find who corresponds
- // #3: for each original entry, find the sorted entry
- // #1 requires extra storage, #2 is slow, #3 can use binary search!
- for (i=0; i < len; ++i) {
- int huff_len = c->sparse ? lengths[values[i]] : lengths[i];
- if (stbv_include_in_sort(c,huff_len)) {
- stbv_uint32 code = stbv_bit_reverse(c->codewords[i]);
- int x=0, n=c->sorted_entries;
- while (n > 1) {
- // invariant: sc[x] <= code < sc[x+n]
- int m = x + (n >> 1);
- if (c->sorted_codewords[m] <= code) {
- x = m;
- n -= (n>>1);
- } else {
- n >>= 1;
- }
- }
- assert(c->sorted_codewords[x] == code);
- if (c->sparse) {
- c->sorted_values[x] = values[i];
- c->codeword_lengths[x] = huff_len;
- } else {
- c->sorted_values[x] = i;
- }
- }
- }
-}
-
-// only run while parsing the header (3 times)
-static int stbv_vorbis_validate(stbv_uint8 *data)
-{
- static stbv_uint8 vorbis[6] = { 'v', 'o', 'r', 'b', 'i', 's' };
- return memcmp(data, vorbis, 6) == 0;
-}
-
-// called from setup only, once per code book
-// (formula implied by specification)
-static int stbv_lookup1_values(int entries, int dim)
-{
- int r = (int) floor(exp((float) log((float) entries) / dim));
- if ((int) floor(pow((float) r+1, dim)) <= entries) // (int) cast for MinGW warning;
- ++r; // floor() to avoid _ftol() when non-CRT
- assert(pow((float) r+1, dim) > entries);
- assert((int) floor(pow((float) r, dim)) <= entries); // (int),floor() as above
- return r;
-}
-
-// called twice per file
-static void stbv_compute_twiddle_factors(int n, float *A, float *B, float *C)
-{
- int n4 = n >> 2, n8 = n >> 3;
- int k,k2;
-
- for (k=k2=0; k < n4; ++k,k2+=2) {
- A[k2 ] = (float) cos(4*k*M_PI/n);
- A[k2+1] = (float) -sin(4*k*M_PI/n);
- B[k2 ] = (float) cos((k2+1)*M_PI/n/2) * 0.5f;
- B[k2+1] = (float) sin((k2+1)*M_PI/n/2) * 0.5f;
- }
- for (k=k2=0; k < n8; ++k,k2+=2) {
- C[k2 ] = (float) cos(2*(k2+1)*M_PI/n);
- C[k2+1] = (float) -sin(2*(k2+1)*M_PI/n);
- }
-}
-
-static void stbv_compute_window(int n, float *window)
-{
- int n2 = n >> 1, i;
- for (i=0; i < n2; ++i)
- window[i] = (float) sin(0.5 * M_PI * stbv_square((float) sin((i - 0 + 0.5) / n2 * 0.5 * M_PI)));
-}
-
-static void stbv_compute_bitreverse(int n, stbv_uint16 *rev)
-{
- int ld = stbv_ilog(n) - 1; // stbv_ilog is off-by-one from normal definitions
- int i, n8 = n >> 3;
- for (i=0; i < n8; ++i)
- rev[i] = (stbv_bit_reverse(i) >> (32-ld+3)) << 2;
-}
-
-static int stbv_init_blocksize(stbv_vorb *f, int b, int n)
-{
- int n2 = n >> 1, n4 = n >> 2, n8 = n >> 3;
- f->A[b] = (float *) stbv_setup_malloc(f, sizeof(float) * n2);
- f->B[b] = (float *) stbv_setup_malloc(f, sizeof(float) * n2);
- f->C[b] = (float *) stbv_setup_malloc(f, sizeof(float) * n4);
- if (!f->A[b] || !f->B[b] || !f->C[b]) return stbv_error(f, VORBIS_outofmem);
- stbv_compute_twiddle_factors(n, f->A[b], f->B[b], f->C[b]);
- f->window[b] = (float *) stbv_setup_malloc(f, sizeof(float) * n2);
- if (!f->window[b]) return stbv_error(f, VORBIS_outofmem);
- stbv_compute_window(n, f->window[b]);
- f->stbv_bit_reverse[b] = (stbv_uint16 *) stbv_setup_malloc(f, sizeof(stbv_uint16) * n8);
- if (!f->stbv_bit_reverse[b]) return stbv_error(f, VORBIS_outofmem);
- stbv_compute_bitreverse(n, f->stbv_bit_reverse[b]);
- return TRUE;
-}
-
-static void stbv_neighbors(stbv_uint16 *x, int n, int *plow, int *phigh)
-{
- int low = -1;
- int high = 65536;
- int i;
- for (i=0; i < n; ++i) {
- if (x[i] > low && x[i] < x[n]) { *plow = i; low = x[i]; }
- if (x[i] < high && x[i] > x[n]) { *phigh = i; high = x[i]; }
- }
-}
-
-// this has been repurposed so y is now the original index instead of y
-typedef struct
-{
- stbv_uint16 x,id;
-} stbv_floor_ordering;
-
-static int STBV_CDECL stbv_point_compare(const void *p, const void *q)
-{
- stbv_floor_ordering *a = (stbv_floor_ordering *) p;
- stbv_floor_ordering *b = (stbv_floor_ordering *) q;
- return a->x < b->x ? -1 : a->x > b->x;
-}
-
-//
-/////////////////////// END LEAF SETUP FUNCTIONS //////////////////////////
-
-
-#if defined(STB_VORBIS_NO_STDIO)
- #define STBV_USE_MEMORY(z) TRUE
-#else
- #define STBV_USE_MEMORY(z) ((z)->stream)
-#endif
-
-static stbv_uint8 stbv_get8(stbv_vorb *z)
-{
- if (STBV_USE_MEMORY(z)) {
- if (z->stream >= z->stream_end) { z->eof = TRUE; return 0; }
- return *z->stream++;
- }
-
- #ifndef STB_VORBIS_NO_STDIO
- {
- int c = fgetc(z->f);
- if (c == EOF) { z->eof = TRUE; return 0; }
- return c;
- }
- #endif
-}
-
-static stbv_uint32 stbv_get32(stbv_vorb *f)
-{
- stbv_uint32 x;
- x = stbv_get8(f);
- x += stbv_get8(f) << 8;
- x += stbv_get8(f) << 16;
- x += (stbv_uint32) stbv_get8(f) << 24;
- return x;
-}
-
-static int stbv_getn(stbv_vorb *z, stbv_uint8 *data, int n)
-{
- if (STBV_USE_MEMORY(z)) {
- if (z->stream+n > z->stream_end) { z->eof = 1; return 0; }
- memcpy(data, z->stream, n);
- z->stream += n;
- return 1;
- }
-
- #ifndef STB_VORBIS_NO_STDIO
- if (fread(data, n, 1, z->f) == 1)
- return 1;
- else {
- z->eof = 1;
- return 0;
- }
- #endif
-}
-
-static void stbv_skip(stbv_vorb *z, int n)
-{
- if (STBV_USE_MEMORY(z)) {
- z->stream += n;
- if (z->stream >= z->stream_end) z->eof = 1;
- return;
- }
- #ifndef STB_VORBIS_NO_STDIO
- {
- long x = ftell(z->f);
- fseek(z->f, x+n, SEEK_SET);
- }
- #endif
-}
-
-static int stbv_set_file_offset(stb_vorbis *f, unsigned int loc)
-{
- #ifndef STB_VORBIS_NO_PUSHDATA_API
- if (f->push_mode) return 0;
- #endif
- f->eof = 0;
- if (STBV_USE_MEMORY(f)) {
- if (f->stream_start + loc >= f->stream_end || f->stream_start + loc < f->stream_start) {
- f->stream = f->stream_end;
- f->eof = 1;
- return 0;
- } else {
- f->stream = f->stream_start + loc;
- return 1;
- }
- }
- #ifndef STB_VORBIS_NO_STDIO
- if (loc + f->f_start < loc || loc >= 0x80000000) {
- loc = 0x7fffffff;
- f->eof = 1;
- } else {
- loc += f->f_start;
- }
- if (!fseek(f->f, loc, SEEK_SET))
- return 1;
- f->eof = 1;
- fseek(f->f, f->f_start, SEEK_END);
- return 0;
- #endif
-}
-
-
-static stbv_uint8 stbv_ogg_page_header[4] = { 0x4f, 0x67, 0x67, 0x53 };
-
-static int stbv_capture_pattern(stbv_vorb *f)
-{
- if (0x4f != stbv_get8(f)) return FALSE;
- if (0x67 != stbv_get8(f)) return FALSE;
- if (0x67 != stbv_get8(f)) return FALSE;
- if (0x53 != stbv_get8(f)) return FALSE;
- return TRUE;
-}
-
-#define STBV_PAGEFLAG_continued_packet 1
-#define STBV_PAGEFLAG_first_page 2
-#define STBV_PAGEFLAG_last_page 4
-
-static int stbv_start_page_no_capturepattern(stbv_vorb *f)
-{
- stbv_uint32 loc0,loc1,n;
- // stream structure version
- if (0 != stbv_get8(f)) return stbv_error(f, VORBIS_invalid_stream_structure_version);
- // header flag
- f->page_flag = stbv_get8(f);
- // absolute granule position
- loc0 = stbv_get32(f);
- loc1 = stbv_get32(f);
- // @TODO: validate loc0,loc1 as valid positions?
- // stream serial number -- vorbis doesn't interleave, so discard
- stbv_get32(f);
- //if (f->serial != stbv_get32(f)) return stbv_error(f, VORBIS_incorrect_stream_serial_number);
- // page sequence number
- n = stbv_get32(f);
- f->last_page = n;
- // CRC32
- stbv_get32(f);
- // page_segments
- f->segment_count = stbv_get8(f);
- if (!stbv_getn(f, f->segments, f->segment_count))
- return stbv_error(f, VORBIS_unexpected_eof);
- // assume we _don't_ know any the sample position of any segments
- f->end_seg_with_known_loc = -2;
- if (loc0 != ~0U || loc1 != ~0U) {
- int i;
- // determine which packet is the last one that will complete
- for (i=f->segment_count-1; i >= 0; --i)
- if (f->segments[i] < 255)
- break;
- // 'i' is now the index of the _last_ segment of a packet that ends
- if (i >= 0) {
- f->end_seg_with_known_loc = i;
- f->known_loc_for_packet = loc0;
- }
- }
- if (f->first_decode) {
- int i,len;
- StbvProbedPage p;
- len = 0;
- for (i=0; i < f->segment_count; ++i)
- len += f->segments[i];
- len += 27 + f->segment_count;
- p.page_start = f->first_audio_page_offset;
- p.page_end = p.page_start + len;
- p.last_decoded_sample = loc0;
- f->p_first = p;
- }
- f->next_seg = 0;
- return TRUE;
-}
-
-static int stbv_start_page(stbv_vorb *f)
-{
- if (!stbv_capture_pattern(f)) return stbv_error(f, VORBIS_missing_capture_pattern);
- return stbv_start_page_no_capturepattern(f);
-}
-
-static int stbv_start_packet(stbv_vorb *f)
-{
- while (f->next_seg == -1) {
- if (!stbv_start_page(f)) return FALSE;
- if (f->page_flag & STBV_PAGEFLAG_continued_packet)
- return stbv_error(f, VORBIS_continued_packet_flag_invalid);
- }
- f->last_seg = FALSE;
- f->valid_bits = 0;
- f->packet_bytes = 0;
- f->bytes_in_seg = 0;
- // f->next_seg is now valid
- return TRUE;
-}
-
-static int stbv_maybe_start_packet(stbv_vorb *f)
-{
- if (f->next_seg == -1) {
- int x = stbv_get8(f);
- if (f->eof) return FALSE; // EOF at page boundary is not an error!
- if (0x4f != x ) return stbv_error(f, VORBIS_missing_capture_pattern);
- if (0x67 != stbv_get8(f)) return stbv_error(f, VORBIS_missing_capture_pattern);
- if (0x67 != stbv_get8(f)) return stbv_error(f, VORBIS_missing_capture_pattern);
- if (0x53 != stbv_get8(f)) return stbv_error(f, VORBIS_missing_capture_pattern);
- if (!stbv_start_page_no_capturepattern(f)) return FALSE;
- if (f->page_flag & STBV_PAGEFLAG_continued_packet) {
- // set up enough state that we can read this packet if we want,
- // e.g. during recovery
- f->last_seg = FALSE;
- f->bytes_in_seg = 0;
- return stbv_error(f, VORBIS_continued_packet_flag_invalid);
- }
- }
- return stbv_start_packet(f);
-}
-
-static int stbv_next_segment(stbv_vorb *f)
-{
- int len;
- if (f->last_seg) return 0;
- if (f->next_seg == -1) {
- f->last_seg_which = f->segment_count-1; // in case stbv_start_page fails
- if (!stbv_start_page(f)) { f->last_seg = 1; return 0; }
- if (!(f->page_flag & STBV_PAGEFLAG_continued_packet)) return stbv_error(f, VORBIS_continued_packet_flag_invalid);
- }
- len = f->segments[f->next_seg++];
- if (len < 255) {
- f->last_seg = TRUE;
- f->last_seg_which = f->next_seg-1;
- }
- if (f->next_seg >= f->segment_count)
- f->next_seg = -1;
- assert(f->bytes_in_seg == 0);
- f->bytes_in_seg = len;
- return len;
-}
-
-#define STBV_EOP (-1)
-#define STBV_INVALID_BITS (-1)
-
-static int stbv_get8_packet_raw(stbv_vorb *f)
-{
- if (!f->bytes_in_seg) { // CLANG!
- if (f->last_seg) return STBV_EOP;
- else if (!stbv_next_segment(f)) return STBV_EOP;
- }
- assert(f->bytes_in_seg > 0);
- --f->bytes_in_seg;
- ++f->packet_bytes;
- return stbv_get8(f);
-}
-
-static int stbv_get8_packet(stbv_vorb *f)
-{
- int x = stbv_get8_packet_raw(f);
- f->valid_bits = 0;
- return x;
-}
-
-static void stbv_flush_packet(stbv_vorb *f)
-{
- while (stbv_get8_packet_raw(f) != STBV_EOP);
-}
-
-// @OPTIMIZE: this is the secondary bit decoder, so it's probably not as important
-// as the huffman decoder?
-static stbv_uint32 stbv_get_bits(stbv_vorb *f, int n)
-{
- stbv_uint32 z;
-
- if (f->valid_bits < 0) return 0;
- if (f->valid_bits < n) {
- if (n > 24) {
- // the accumulator technique below would not work correctly in this case
- z = stbv_get_bits(f, 24);
- z += stbv_get_bits(f, n-24) << 24;
- return z;
- }
- if (f->valid_bits == 0) f->acc = 0;
- while (f->valid_bits < n) {
- int z = stbv_get8_packet_raw(f);
- if (z == STBV_EOP) {
- f->valid_bits = STBV_INVALID_BITS;
- return 0;
- }
- f->acc += z << f->valid_bits;
- f->valid_bits += 8;
- }
- }
- if (f->valid_bits < 0) return 0;
- z = f->acc & ((1 << n)-1);
- f->acc >>= n;
- f->valid_bits -= n;
- return z;
-}
-
-// @OPTIMIZE: primary accumulator for huffman
-// expand the buffer to as many bits as possible without reading off end of packet
-// it might be nice to allow f->valid_bits and f->acc to be stored in registers,
-// e.g. cache them locally and decode locally
-static __forceinline void stbv_prep_huffman(stbv_vorb *f)
-{
- if (f->valid_bits <= 24) {
- if (f->valid_bits == 0) f->acc = 0;
- do {
- int z;
- if (f->last_seg && !f->bytes_in_seg) return;
- z = stbv_get8_packet_raw(f);
- if (z == STBV_EOP) return;
- f->acc += (unsigned) z << f->valid_bits;
- f->valid_bits += 8;
- } while (f->valid_bits <= 24);
- }
-}
-
-enum
-{
- STBV_VORBIS_packet_id = 1,
- STBV_VORBIS_packet_comment = 3,
- STBV_VORBIS_packet_setup = 5
-};
-
-static int stbv_codebook_decode_scalar_raw(stbv_vorb *f, StbvCodebook *c)
-{
- int i;
- stbv_prep_huffman(f);
-
- if (c->codewords == NULL && c->sorted_codewords == NULL)
- return -1;
-
- // cases to use binary search: sorted_codewords && !c->codewords
- // sorted_codewords && c->entries > 8
- if (c->entries > 8 ? c->sorted_codewords!=NULL : !c->codewords) {
- // binary search
- stbv_uint32 code = stbv_bit_reverse(f->acc);
- int x=0, n=c->sorted_entries, len;
-
- while (n > 1) {
- // invariant: sc[x] <= code < sc[x+n]
- int m = x + (n >> 1);
- if (c->sorted_codewords[m] <= code) {
- x = m;
- n -= (n>>1);
- } else {
- n >>= 1;
- }
- }
- // x is now the sorted index
- if (!c->sparse) x = c->sorted_values[x];
- // x is now sorted index if sparse, or symbol otherwise
- len = c->codeword_lengths[x];
- if (f->valid_bits >= len) {
- f->acc >>= len;
- f->valid_bits -= len;
- return x;
- }
-
- f->valid_bits = 0;
- return -1;
- }
-
- // if small, linear search
- assert(!c->sparse);
- for (i=0; i < c->entries; ++i) {
- if (c->codeword_lengths[i] == NO_CODE) continue;
- if (c->codewords[i] == (f->acc & ((1 << c->codeword_lengths[i])-1))) {
- if (f->valid_bits >= c->codeword_lengths[i]) {
- f->acc >>= c->codeword_lengths[i];
- f->valid_bits -= c->codeword_lengths[i];
- return i;
- }
- f->valid_bits = 0;
- return -1;
- }
- }
-
- stbv_error(f, VORBIS_invalid_stream);
- f->valid_bits = 0;
- return -1;
-}
-
-#ifndef STB_VORBIS_NO_INLINE_DECODE
-
-#define STBV_DECODE_RAW(var, f,c) \
- if (f->valid_bits < STB_VORBIS_FAST_HUFFMAN_LENGTH) \
- stbv_prep_huffman(f); \
- var = f->acc & STBV_FAST_HUFFMAN_TABLE_MASK; \
- var = c->fast_huffman[var]; \
- if (var >= 0) { \
- int n = c->codeword_lengths[var]; \
- f->acc >>= n; \
- f->valid_bits -= n; \
- if (f->valid_bits < 0) { f->valid_bits = 0; var = -1; } \
- } else { \
- var = stbv_codebook_decode_scalar_raw(f,c); \
- }
-
-#else
-
-static int stbv_codebook_decode_scalar(stbv_vorb *f, StbvCodebook *c)
-{
- int i;
- if (f->valid_bits < STB_VORBIS_FAST_HUFFMAN_LENGTH)
- stbv_prep_huffman(f);
- // fast huffman table lookup
- i = f->acc & STBV_FAST_HUFFMAN_TABLE_MASK;
- i = c->fast_huffman[i];
- if (i >= 0) {
- f->acc >>= c->codeword_lengths[i];
- f->valid_bits -= c->codeword_lengths[i];
- if (f->valid_bits < 0) { f->valid_bits = 0; return -1; }
- return i;
- }
- return stbv_codebook_decode_scalar_raw(f,c);
-}
-
-#define STBV_DECODE_RAW(var,f,c) var = stbv_codebook_decode_scalar(f,c);
-
-#endif
-
-#define STBV_DECODE(var,f,c) \
- STBV_DECODE_RAW(var,f,c) \
- if (c->sparse) var = c->sorted_values[var];
-
-#ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK
- #define DECODE_VQ(var,f,c) STBV_DECODE_RAW(var,f,c)
-#else
- #define DECODE_VQ(var,f,c) STBV_DECODE(var,f,c)
-#endif
-
-
-
-
-
-
-// STBV_CODEBOOK_ELEMENT_FAST is an optimization for the CODEBOOK_FLOATS case
-// where we avoid one addition
-#define STBV_CODEBOOK_ELEMENT(c,off) (c->multiplicands[off])
-#define STBV_CODEBOOK_ELEMENT_FAST(c,off) (c->multiplicands[off])
-#define STBV_CODEBOOK_ELEMENT_BASE(c) (0)
-
-static int stbv_codebook_decode_start(stbv_vorb *f, StbvCodebook *c)
-{
- int z = -1;
-
- // type 0 is only legal in a scalar context
- if (c->lookup_type == 0)
- stbv_error(f, VORBIS_invalid_stream);
- else {
- DECODE_VQ(z,f,c);
- if (c->sparse) assert(z < c->sorted_entries);
- if (z < 0) { // check for STBV_EOP
- if (!f->bytes_in_seg)
- if (f->last_seg)
- return z;
- stbv_error(f, VORBIS_invalid_stream);
- }
- }
- return z;
-}
-
-static int stbv_codebook_decode(stbv_vorb *f, StbvCodebook *c, float *output, int len)
-{
- int i,z = stbv_codebook_decode_start(f,c);
- if (z < 0) return FALSE;
- if (len > c->dimensions) len = c->dimensions;
-
-#ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK
- if (c->lookup_type == 1) {
- float last = STBV_CODEBOOK_ELEMENT_BASE(c);
- int div = 1;
- for (i=0; i < len; ++i) {
- int off = (z / div) % c->lookup_values;
- float val = STBV_CODEBOOK_ELEMENT_FAST(c,off) + last;
- output[i] += val;
- if (c->sequence_p) last = val + c->minimum_value;
- div *= c->lookup_values;
- }
- return TRUE;
- }
-#endif
-
- z *= c->dimensions;
- if (c->sequence_p) {
- float last = STBV_CODEBOOK_ELEMENT_BASE(c);
- for (i=0; i < len; ++i) {
- float val = STBV_CODEBOOK_ELEMENT_FAST(c,z+i) + last;
- output[i] += val;
- last = val + c->minimum_value;
- }
- } else {
- float last = STBV_CODEBOOK_ELEMENT_BASE(c);
- for (i=0; i < len; ++i) {
- output[i] += STBV_CODEBOOK_ELEMENT_FAST(c,z+i) + last;
- }
- }
-
- return TRUE;
-}
-
-static int stbv_codebook_decode_step(stbv_vorb *f, StbvCodebook *c, float *output, int len, int step)
-{
- int i,z = stbv_codebook_decode_start(f,c);
- float last = STBV_CODEBOOK_ELEMENT_BASE(c);
- if (z < 0) return FALSE;
- if (len > c->dimensions) len = c->dimensions;
-
-#ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK
- if (c->lookup_type == 1) {
- int div = 1;
- for (i=0; i < len; ++i) {
- int off = (z / div) % c->lookup_values;
- float val = STBV_CODEBOOK_ELEMENT_FAST(c,off) + last;
- output[i*step] += val;
- if (c->sequence_p) last = val;
- div *= c->lookup_values;
- }
- return TRUE;
- }
-#endif
-
- z *= c->dimensions;
- for (i=0; i < len; ++i) {
- float val = STBV_CODEBOOK_ELEMENT_FAST(c,z+i) + last;
- output[i*step] += val;
- if (c->sequence_p) last = val;
- }
-
- return TRUE;
-}
-
-static int stbv_codebook_decode_deinterleave_repeat(stbv_vorb *f, StbvCodebook *c, float **outputs, int ch, int *c_inter_p, int *p_inter_p, int len, int total_decode)
-{
- int c_inter = *c_inter_p;
- int p_inter = *p_inter_p;
- int i,z, effective = c->dimensions;
-
- // type 0 is only legal in a scalar context
- if (c->lookup_type == 0) return stbv_error(f, VORBIS_invalid_stream);
-
- while (total_decode > 0) {
- float last = STBV_CODEBOOK_ELEMENT_BASE(c);
- DECODE_VQ(z,f,c);
- #ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK
- assert(!c->sparse || z < c->sorted_entries);
- #endif
- if (z < 0) {
- if (!f->bytes_in_seg)
- if (f->last_seg) return FALSE;
- return stbv_error(f, VORBIS_invalid_stream);
- }
-
- // if this will take us off the end of the buffers, stop short!
- // we check by computing the length of the virtual interleaved
- // buffer (len*ch), our current offset within it (p_inter*ch)+(c_inter),
- // and the length we'll be using (effective)
- if (c_inter + p_inter*ch + effective > len * ch) {
- effective = len*ch - (p_inter*ch - c_inter);
- }
-
- #ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK
- if (c->lookup_type == 1) {
- int div = 1;
- for (i=0; i < effective; ++i) {
- int off = (z / div) % c->lookup_values;
- float val = STBV_CODEBOOK_ELEMENT_FAST(c,off) + last;
- if (outputs[c_inter])
- outputs[c_inter][p_inter] += val;
- if (++c_inter == ch) { c_inter = 0; ++p_inter; }
- if (c->sequence_p) last = val;
- div *= c->lookup_values;
- }
- } else
- #endif
- {
- z *= c->dimensions;
- if (c->sequence_p) {
- for (i=0; i < effective; ++i) {
- float val = STBV_CODEBOOK_ELEMENT_FAST(c,z+i) + last;
- if (outputs[c_inter])
- outputs[c_inter][p_inter] += val;
- if (++c_inter == ch) { c_inter = 0; ++p_inter; }
- last = val;
- }
- } else {
- for (i=0; i < effective; ++i) {
- float val = STBV_CODEBOOK_ELEMENT_FAST(c,z+i) + last;
- if (outputs[c_inter])
- outputs[c_inter][p_inter] += val;
- if (++c_inter == ch) { c_inter = 0; ++p_inter; }
- }
- }
- }
-
- total_decode -= effective;
- }
- *c_inter_p = c_inter;
- *p_inter_p = p_inter;
- return TRUE;
-}
-
-static int stbv_predict_point(int x, int x0, int x1, int y0, int y1)
-{
- int dy = y1 - y0;
- int adx = x1 - x0;
- // @OPTIMIZE: force int division to round in the right direction... is this necessary on x86?
- int err = abs(dy) * (x - x0);
- int off = err / adx;
- return dy < 0 ? y0 - off : y0 + off;
-}
-
-// the following table is block-copied from the specification
-static float stbv_inverse_db_table[256] =
-{
- 1.0649863e-07f, 1.1341951e-07f, 1.2079015e-07f, 1.2863978e-07f,
- 1.3699951e-07f, 1.4590251e-07f, 1.5538408e-07f, 1.6548181e-07f,
- 1.7623575e-07f, 1.8768855e-07f, 1.9988561e-07f, 2.1287530e-07f,
- 2.2670913e-07f, 2.4144197e-07f, 2.5713223e-07f, 2.7384213e-07f,
- 2.9163793e-07f, 3.1059021e-07f, 3.3077411e-07f, 3.5226968e-07f,
- 3.7516214e-07f, 3.9954229e-07f, 4.2550680e-07f, 4.5315863e-07f,
- 4.8260743e-07f, 5.1396998e-07f, 5.4737065e-07f, 5.8294187e-07f,
- 6.2082472e-07f, 6.6116941e-07f, 7.0413592e-07f, 7.4989464e-07f,
- 7.9862701e-07f, 8.5052630e-07f, 9.0579828e-07f, 9.6466216e-07f,
- 1.0273513e-06f, 1.0941144e-06f, 1.1652161e-06f, 1.2409384e-06f,
- 1.3215816e-06f, 1.4074654e-06f, 1.4989305e-06f, 1.5963394e-06f,
- 1.7000785e-06f, 1.8105592e-06f, 1.9282195e-06f, 2.0535261e-06f,
- 2.1869758e-06f, 2.3290978e-06f, 2.4804557e-06f, 2.6416497e-06f,
- 2.8133190e-06f, 2.9961443e-06f, 3.1908506e-06f, 3.3982101e-06f,
- 3.6190449e-06f, 3.8542308e-06f, 4.1047004e-06f, 4.3714470e-06f,
- 4.6555282e-06f, 4.9580707e-06f, 5.2802740e-06f, 5.6234160e-06f,
- 5.9888572e-06f, 6.3780469e-06f, 6.7925283e-06f, 7.2339451e-06f,
- 7.7040476e-06f, 8.2047000e-06f, 8.7378876e-06f, 9.3057248e-06f,
- 9.9104632e-06f, 1.0554501e-05f, 1.1240392e-05f, 1.1970856e-05f,
- 1.2748789e-05f, 1.3577278e-05f, 1.4459606e-05f, 1.5399272e-05f,
- 1.6400004e-05f, 1.7465768e-05f, 1.8600792e-05f, 1.9809576e-05f,
- 2.1096914e-05f, 2.2467911e-05f, 2.3928002e-05f, 2.5482978e-05f,
- 2.7139006e-05f, 2.8902651e-05f, 3.0780908e-05f, 3.2781225e-05f,
- 3.4911534e-05f, 3.7180282e-05f, 3.9596466e-05f, 4.2169667e-05f,
- 4.4910090e-05f, 4.7828601e-05f, 5.0936773e-05f, 5.4246931e-05f,
- 5.7772202e-05f, 6.1526565e-05f, 6.5524908e-05f, 6.9783085e-05f,
- 7.4317983e-05f, 7.9147585e-05f, 8.4291040e-05f, 8.9768747e-05f,
- 9.5602426e-05f, 0.00010181521f, 0.00010843174f, 0.00011547824f,
- 0.00012298267f, 0.00013097477f, 0.00013948625f, 0.00014855085f,
- 0.00015820453f, 0.00016848555f, 0.00017943469f, 0.00019109536f,
- 0.00020351382f, 0.00021673929f, 0.00023082423f, 0.00024582449f,
- 0.00026179955f, 0.00027881276f, 0.00029693158f, 0.00031622787f,
- 0.00033677814f, 0.00035866388f, 0.00038197188f, 0.00040679456f,
- 0.00043323036f, 0.00046138411f, 0.00049136745f, 0.00052329927f,
- 0.00055730621f, 0.00059352311f, 0.00063209358f, 0.00067317058f,
- 0.00071691700f, 0.00076350630f, 0.00081312324f, 0.00086596457f,
- 0.00092223983f, 0.00098217216f, 0.0010459992f, 0.0011139742f,
- 0.0011863665f, 0.0012634633f, 0.0013455702f, 0.0014330129f,
- 0.0015261382f, 0.0016253153f, 0.0017309374f, 0.0018434235f,
- 0.0019632195f, 0.0020908006f, 0.0022266726f, 0.0023713743f,
- 0.0025254795f, 0.0026895994f, 0.0028643847f, 0.0030505286f,
- 0.0032487691f, 0.0034598925f, 0.0036847358f, 0.0039241906f,
- 0.0041792066f, 0.0044507950f, 0.0047400328f, 0.0050480668f,
- 0.0053761186f, 0.0057254891f, 0.0060975636f, 0.0064938176f,
- 0.0069158225f, 0.0073652516f, 0.0078438871f, 0.0083536271f,
- 0.0088964928f, 0.009474637f, 0.010090352f, 0.010746080f,
- 0.011444421f, 0.012188144f, 0.012980198f, 0.013823725f,
- 0.014722068f, 0.015678791f, 0.016697687f, 0.017782797f,
- 0.018938423f, 0.020169149f, 0.021479854f, 0.022875735f,
- 0.024362330f, 0.025945531f, 0.027631618f, 0.029427276f,
- 0.031339626f, 0.033376252f, 0.035545228f, 0.037855157f,
- 0.040315199f, 0.042935108f, 0.045725273f, 0.048696758f,
- 0.051861348f, 0.055231591f, 0.058820850f, 0.062643361f,
- 0.066714279f, 0.071049749f, 0.075666962f, 0.080584227f,
- 0.085821044f, 0.091398179f, 0.097337747f, 0.10366330f,
- 0.11039993f, 0.11757434f, 0.12521498f, 0.13335215f,
- 0.14201813f, 0.15124727f, 0.16107617f, 0.17154380f,
- 0.18269168f, 0.19456402f, 0.20720788f, 0.22067342f,
- 0.23501402f, 0.25028656f, 0.26655159f, 0.28387361f,
- 0.30232132f, 0.32196786f, 0.34289114f, 0.36517414f,
- 0.38890521f, 0.41417847f, 0.44109412f, 0.46975890f,
- 0.50028648f, 0.53279791f, 0.56742212f, 0.60429640f,
- 0.64356699f, 0.68538959f, 0.72993007f, 0.77736504f,
- 0.82788260f, 0.88168307f, 0.9389798f, 1.0f
-};
-
-
-// @OPTIMIZE: if you want to replace this bresenham line-drawing routine,
-// note that you must produce bit-identical output to decode correctly;
-// this specific sequence of operations is specified in the spec (it's
-// drawing integer-quantized frequency-space lines that the encoder
-// expects to be exactly the same)
-// ... also, isn't the whole point of Bresenham's algorithm to NOT
-// have to divide in the setup? sigh.
-#ifndef STB_VORBIS_NO_DEFER_FLOOR
-#define STBV_LINE_OP(a,b) a *= b
-#else
-#define STBV_LINE_OP(a,b) a = b
-#endif
-
-#ifdef STB_VORBIS_DIVIDE_TABLE
-#define STBV_DIVTAB_NUMER 32
-#define STBV_DIVTAB_DENOM 64
-stbv_int8 stbv_integer_divide_table[STBV_DIVTAB_NUMER][STBV_DIVTAB_DENOM]; // 2KB
-#endif
-
-static __forceinline void stbv_draw_line(float *output, int x0, int y0, int x1, int y1, int n)
-{
- int dy = y1 - y0;
- int adx = x1 - x0;
- int ady = abs(dy);
- int base;
- int x=x0,y=y0;
- int err = 0;
- int sy;
-
-#ifdef STB_VORBIS_DIVIDE_TABLE
- if (adx < STBV_DIVTAB_DENOM && ady < STBV_DIVTAB_NUMER) {
- if (dy < 0) {
- base = -stbv_integer_divide_table[ady][adx];
- sy = base-1;
- } else {
- base = stbv_integer_divide_table[ady][adx];
- sy = base+1;
- }
- } else {
- base = dy / adx;
- if (dy < 0)
- sy = base - 1;
- else
- sy = base+1;
- }
-#else
- base = dy / adx;
- if (dy < 0)
- sy = base - 1;
- else
- sy = base+1;
-#endif
- ady -= abs(base) * adx;
- if (x1 > n) x1 = n;
- if (x < x1) {
- STBV_LINE_OP(output[x], stbv_inverse_db_table[y]);
- for (++x; x < x1; ++x) {
- err += ady;
- if (err >= adx) {
- err -= adx;
- y += sy;
- } else
- y += base;
- STBV_LINE_OP(output[x], stbv_inverse_db_table[y]);
- }
- }
-}
-
-static int stbv_residue_decode(stbv_vorb *f, StbvCodebook *book, float *target, int offset, int n, int rtype)
-{
- int k;
- if (rtype == 0) {
- int step = n / book->dimensions;
- for (k=0; k < step; ++k)
- if (!stbv_codebook_decode_step(f, book, target+offset+k, n-offset-k, step))
- return FALSE;
- } else {
- for (k=0; k < n; ) {
- if (!stbv_codebook_decode(f, book, target+offset, n-k))
- return FALSE;
- k += book->dimensions;
- offset += book->dimensions;
- }
- }
- return TRUE;
-}
-
-// n is 1/2 of the blocksize --
-// specification: "Correct per-vector decode length is [n]/2"
-static void stbv_decode_residue(stbv_vorb *f, float *residue_buffers[], int ch, int n, int rn, stbv_uint8 *do_not_decode)
-{
- int i,j,pass;
- StbvResidue *r = f->residue_config + rn;
- int rtype = f->residue_types[rn];
- int c = r->classbook;
- int classwords = f->codebooks[c].dimensions;
- unsigned int actual_size = rtype == 2 ? n*2 : n;
- unsigned int limit_r_begin = (r->begin < actual_size ? r->begin : actual_size);
- unsigned int limit_r_end = (r->end < actual_size ? r->end : actual_size);
- int n_read = limit_r_end - limit_r_begin;
- int part_read = n_read / r->part_size;
- int temp_alloc_point = stbv_temp_alloc_save(f);
- #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
- stbv_uint8 ***part_classdata = (stbv_uint8 ***) stbv_temp_block_array(f,f->channels, part_read * sizeof(**part_classdata));
- #else
- int **classifications = (int **) stbv_temp_block_array(f,f->channels, part_read * sizeof(**classifications));
- #endif
-
- STBV_CHECK(f);
-
- for (i=0; i < ch; ++i)
- if (!do_not_decode[i])
- memset(residue_buffers[i], 0, sizeof(float) * n);
-
- if (rtype == 2 && ch != 1) {
- for (j=0; j < ch; ++j)
- if (!do_not_decode[j])
- break;
- if (j == ch)
- goto done;
-
- for (pass=0; pass < 8; ++pass) {
- int pcount = 0, class_set = 0;
- if (ch == 2) {
- while (pcount < part_read) {
- int z = r->begin + pcount*r->part_size;
- int c_inter = (z & 1), p_inter = z>>1;
- if (pass == 0) {
- StbvCodebook *c = f->codebooks+r->classbook;
- int q;
- STBV_DECODE(q,f,c);
- if (q == STBV_EOP) goto done;
- #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
- part_classdata[0][class_set] = r->classdata[q];
- #else
- for (i=classwords-1; i >= 0; --i) {
- classifications[0][i+pcount] = q % r->classifications;
- q /= r->classifications;
- }
- #endif
- }
- for (i=0; i < classwords && pcount < part_read; ++i, ++pcount) {
- int z = r->begin + pcount*r->part_size;
- #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
- int c = part_classdata[0][class_set][i];
- #else
- int c = classifications[0][pcount];
- #endif
- int b = r->residue_books[c][pass];
- if (b >= 0) {
- StbvCodebook *book = f->codebooks + b;
- #ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK
- if (!stbv_codebook_decode_deinterleave_repeat(f, book, residue_buffers, ch, &c_inter, &p_inter, n, r->part_size))
- goto done;
- #else
- // saves 1%
- if (!stbv_codebook_decode_deinterleave_repeat(f, book, residue_buffers, ch, &c_inter, &p_inter, n, r->part_size))
- goto done;
- #endif
- } else {
- z += r->part_size;
- c_inter = z & 1;
- p_inter = z >> 1;
- }
- }
- #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
- ++class_set;
- #endif
- }
- } else if (ch == 1) {
- while (pcount < part_read) {
- int z = r->begin + pcount*r->part_size;
- int c_inter = 0, p_inter = z;
- if (pass == 0) {
- StbvCodebook *c = f->codebooks+r->classbook;
- int q;
- STBV_DECODE(q,f,c);
- if (q == STBV_EOP) goto done;
- #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
- part_classdata[0][class_set] = r->classdata[q];
- #else
- for (i=classwords-1; i >= 0; --i) {
- classifications[0][i+pcount] = q % r->classifications;
- q /= r->classifications;
- }
- #endif
- }
- for (i=0; i < classwords && pcount < part_read; ++i, ++pcount) {
- int z = r->begin + pcount*r->part_size;
- #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
- int c = part_classdata[0][class_set][i];
- #else
- int c = classifications[0][pcount];
- #endif
- int b = r->residue_books[c][pass];
- if (b >= 0) {
- StbvCodebook *book = f->codebooks + b;
- if (!stbv_codebook_decode_deinterleave_repeat(f, book, residue_buffers, ch, &c_inter, &p_inter, n, r->part_size))
- goto done;
- } else {
- z += r->part_size;
- c_inter = 0;
- p_inter = z;
- }
- }
- #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
- ++class_set;
- #endif
- }
- } else {
- while (pcount < part_read) {
- int z = r->begin + pcount*r->part_size;
- int c_inter = z % ch, p_inter = z/ch;
- if (pass == 0) {
- StbvCodebook *c = f->codebooks+r->classbook;
- int q;
- STBV_DECODE(q,f,c);
- if (q == STBV_EOP) goto done;
- #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
- part_classdata[0][class_set] = r->classdata[q];
- #else
- for (i=classwords-1; i >= 0; --i) {
- classifications[0][i+pcount] = q % r->classifications;
- q /= r->classifications;
- }
- #endif
- }
- for (i=0; i < classwords && pcount < part_read; ++i, ++pcount) {
- int z = r->begin + pcount*r->part_size;
- #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
- int c = part_classdata[0][class_set][i];
- #else
- int c = classifications[0][pcount];
- #endif
- int b = r->residue_books[c][pass];
- if (b >= 0) {
- StbvCodebook *book = f->codebooks + b;
- if (!stbv_codebook_decode_deinterleave_repeat(f, book, residue_buffers, ch, &c_inter, &p_inter, n, r->part_size))
- goto done;
- } else {
- z += r->part_size;
- c_inter = z % ch;
- p_inter = z / ch;
- }
- }
- #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
- ++class_set;
- #endif
- }
- }
- }
- goto done;
- }
- STBV_CHECK(f);
-
- for (pass=0; pass < 8; ++pass) {
- int pcount = 0, class_set=0;
- while (pcount < part_read) {
- if (pass == 0) {
- for (j=0; j < ch; ++j) {
- if (!do_not_decode[j]) {
- StbvCodebook *c = f->codebooks+r->classbook;
- int temp;
- STBV_DECODE(temp,f,c);
- if (temp == STBV_EOP) goto done;
- #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
- part_classdata[j][class_set] = r->classdata[temp];
- #else
- for (i=classwords-1; i >= 0; --i) {
- classifications[j][i+pcount] = temp % r->classifications;
- temp /= r->classifications;
- }
- #endif
- }
- }
- }
- for (i=0; i < classwords && pcount < part_read; ++i, ++pcount) {
- for (j=0; j < ch; ++j) {
- if (!do_not_decode[j]) {
- #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
- int c = part_classdata[j][class_set][i];
- #else
- int c = classifications[j][pcount];
- #endif
- int b = r->residue_books[c][pass];
- if (b >= 0) {
- float *target = residue_buffers[j];
- int offset = r->begin + pcount * r->part_size;
- int n = r->part_size;
- StbvCodebook *book = f->codebooks + b;
- if (!stbv_residue_decode(f, book, target, offset, n, rtype))
- goto done;
- }
- }
- }
- }
- #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
- ++class_set;
- #endif
- }
- }
- done:
- STBV_CHECK(f);
- #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
- stbv_temp_free(f,part_classdata);
- #else
- stbv_temp_free(f,classifications);
- #endif
- stbv_temp_alloc_restore(f,temp_alloc_point);
-}
-
-
-#if 0
-// slow way for debugging
-void inverse_mdct_slow(float *buffer, int n)
-{
- int i,j;
- int n2 = n >> 1;
- float *x = (float *) malloc(sizeof(*x) * n2);
- memcpy(x, buffer, sizeof(*x) * n2);
- for (i=0; i < n; ++i) {
- float acc = 0;
- for (j=0; j < n2; ++j)
- // formula from paper:
- //acc += n/4.0f * x[j] * (float) cos(M_PI / 2 / n * (2 * i + 1 + n/2.0)*(2*j+1));
- // formula from wikipedia
- //acc += 2.0f / n2 * x[j] * (float) cos(M_PI/n2 * (i + 0.5 + n2/2)*(j + 0.5));
- // these are equivalent, except the formula from the paper inverts the multiplier!
- // however, what actually works is NO MULTIPLIER!?!
- //acc += 64 * 2.0f / n2 * x[j] * (float) cos(M_PI/n2 * (i + 0.5 + n2/2)*(j + 0.5));
- acc += x[j] * (float) cos(M_PI / 2 / n * (2 * i + 1 + n/2.0)*(2*j+1));
- buffer[i] = acc;
- }
- free(x);
-}
-#elif 0
-// same as above, but just barely able to run in real time on modern machines
-void inverse_mdct_slow(float *buffer, int n, stbv_vorb *f, int blocktype)
-{
- float mcos[16384];
- int i,j;
- int n2 = n >> 1, nmask = (n << 2) -1;
- float *x = (float *) malloc(sizeof(*x) * n2);
- memcpy(x, buffer, sizeof(*x) * n2);
- for (i=0; i < 4*n; ++i)
- mcos[i] = (float) cos(M_PI / 2 * i / n);
-
- for (i=0; i < n; ++i) {
- float acc = 0;
- for (j=0; j < n2; ++j)
- acc += x[j] * mcos[(2 * i + 1 + n2)*(2*j+1) & nmask];
- buffer[i] = acc;
- }
- free(x);
-}
-#elif 0
-// transform to use a slow dct-iv; this is STILL basically trivial,
-// but only requires half as many ops
-void dct_iv_slow(float *buffer, int n)
-{
- float mcos[16384];
- float x[2048];
- int i,j;
- int n2 = n >> 1, nmask = (n << 3) - 1;
- memcpy(x, buffer, sizeof(*x) * n);
- for (i=0; i < 8*n; ++i)
- mcos[i] = (float) cos(M_PI / 4 * i / n);
- for (i=0; i < n; ++i) {
- float acc = 0;
- for (j=0; j < n; ++j)
- acc += x[j] * mcos[((2 * i + 1)*(2*j+1)) & nmask];
- buffer[i] = acc;
- }
-}
-
-void inverse_mdct_slow(float *buffer, int n, stbv_vorb *f, int blocktype)
-{
- int i, n4 = n >> 2, n2 = n >> 1, n3_4 = n - n4;
- float temp[4096];
-
- memcpy(temp, buffer, n2 * sizeof(float));
- dct_iv_slow(temp, n2); // returns -c'-d, a-b'
-
- for (i=0; i < n4 ; ++i) buffer[i] = temp[i+n4]; // a-b'
- for ( ; i < n3_4; ++i) buffer[i] = -temp[n3_4 - i - 1]; // b-a', c+d'
- for ( ; i < n ; ++i) buffer[i] = -temp[i - n3_4]; // c'+d
-}
-#endif
-
-#ifndef LIBVORBIS_MDCT
-#define LIBVORBIS_MDCT 0
-#endif
-
-#if LIBVORBIS_MDCT
-// directly call the vorbis MDCT using an interface documented
-// by Jeff Roberts... useful for performance comparison
-typedef struct
-{
- int n;
- int log2n;
-
- float *trig;
- int *bitrev;
-
- float scale;
-} mdct_lookup;
-
-extern void mdct_init(mdct_lookup *lookup, int n);
-extern void mdct_clear(mdct_lookup *l);
-extern void mdct_backward(mdct_lookup *init, float *in, float *out);
-
-mdct_lookup M1,M2;
-
-void stbv_inverse_mdct(float *buffer, int n, stbv_vorb *f, int blocktype)
-{
- mdct_lookup *M;
- if (M1.n == n) M = &M1;
- else if (M2.n == n) M = &M2;
- else if (M1.n == 0) { mdct_init(&M1, n); M = &M1; }
- else {
- if (M2.n) __asm int 3;
- mdct_init(&M2, n);
- M = &M2;
- }
-
- mdct_backward(M, buffer, buffer);
-}
-#endif
-
-
-// the following were split out into separate functions while optimizing;
-// they could be pushed back up but eh. __forceinline showed no change;
-// they're probably already being inlined.
-static void stbv_imdct_step3_iter0_loop(int n, float *e, int i_off, int k_off, float *A)
-{
- float *ee0 = e + i_off;
- float *ee2 = ee0 + k_off;
- int i;
-
- assert((n & 3) == 0);
- for (i=(n>>2); i > 0; --i) {
- float k00_20, k01_21;
- k00_20 = ee0[ 0] - ee2[ 0];
- k01_21 = ee0[-1] - ee2[-1];
- ee0[ 0] += ee2[ 0];//ee0[ 0] = ee0[ 0] + ee2[ 0];
- ee0[-1] += ee2[-1];//ee0[-1] = ee0[-1] + ee2[-1];
- ee2[ 0] = k00_20 * A[0] - k01_21 * A[1];
- ee2[-1] = k01_21 * A[0] + k00_20 * A[1];
- A += 8;
-
- k00_20 = ee0[-2] - ee2[-2];
- k01_21 = ee0[-3] - ee2[-3];
- ee0[-2] += ee2[-2];//ee0[-2] = ee0[-2] + ee2[-2];
- ee0[-3] += ee2[-3];//ee0[-3] = ee0[-3] + ee2[-3];
- ee2[-2] = k00_20 * A[0] - k01_21 * A[1];
- ee2[-3] = k01_21 * A[0] + k00_20 * A[1];
- A += 8;
-
- k00_20 = ee0[-4] - ee2[-4];
- k01_21 = ee0[-5] - ee2[-5];
- ee0[-4] += ee2[-4];//ee0[-4] = ee0[-4] + ee2[-4];
- ee0[-5] += ee2[-5];//ee0[-5] = ee0[-5] + ee2[-5];
- ee2[-4] = k00_20 * A[0] - k01_21 * A[1];
- ee2[-5] = k01_21 * A[0] + k00_20 * A[1];
- A += 8;
-
- k00_20 = ee0[-6] - ee2[-6];
- k01_21 = ee0[-7] - ee2[-7];
- ee0[-6] += ee2[-6];//ee0[-6] = ee0[-6] + ee2[-6];
- ee0[-7] += ee2[-7];//ee0[-7] = ee0[-7] + ee2[-7];
- ee2[-6] = k00_20 * A[0] - k01_21 * A[1];
- ee2[-7] = k01_21 * A[0] + k00_20 * A[1];
- A += 8;
- ee0 -= 8;
- ee2 -= 8;
- }
-}
-
-static void stbv_imdct_step3_inner_r_loop(int lim, float *e, int d0, int k_off, float *A, int k1)
-{
- int i;
- float k00_20, k01_21;
-
- float *e0 = e + d0;
- float *e2 = e0 + k_off;
-
- for (i=lim >> 2; i > 0; --i) {
- k00_20 = e0[-0] - e2[-0];
- k01_21 = e0[-1] - e2[-1];
- e0[-0] += e2[-0];//e0[-0] = e0[-0] + e2[-0];
- e0[-1] += e2[-1];//e0[-1] = e0[-1] + e2[-1];
- e2[-0] = (k00_20)*A[0] - (k01_21) * A[1];
- e2[-1] = (k01_21)*A[0] + (k00_20) * A[1];
-
- A += k1;
-
- k00_20 = e0[-2] - e2[-2];
- k01_21 = e0[-3] - e2[-3];
- e0[-2] += e2[-2];//e0[-2] = e0[-2] + e2[-2];
- e0[-3] += e2[-3];//e0[-3] = e0[-3] + e2[-3];
- e2[-2] = (k00_20)*A[0] - (k01_21) * A[1];
- e2[-3] = (k01_21)*A[0] + (k00_20) * A[1];
-
- A += k1;
-
- k00_20 = e0[-4] - e2[-4];
- k01_21 = e0[-5] - e2[-5];
- e0[-4] += e2[-4];//e0[-4] = e0[-4] + e2[-4];
- e0[-5] += e2[-5];//e0[-5] = e0[-5] + e2[-5];
- e2[-4] = (k00_20)*A[0] - (k01_21) * A[1];
- e2[-5] = (k01_21)*A[0] + (k00_20) * A[1];
-
- A += k1;
-
- k00_20 = e0[-6] - e2[-6];
- k01_21 = e0[-7] - e2[-7];
- e0[-6] += e2[-6];//e0[-6] = e0[-6] + e2[-6];
- e0[-7] += e2[-7];//e0[-7] = e0[-7] + e2[-7];
- e2[-6] = (k00_20)*A[0] - (k01_21) * A[1];
- e2[-7] = (k01_21)*A[0] + (k00_20) * A[1];
-
- e0 -= 8;
- e2 -= 8;
-
- A += k1;
- }
-}
-
-static void stbv_imdct_step3_inner_s_loop(int n, float *e, int i_off, int k_off, float *A, int a_off, int k0)
-{
- int i;
- float A0 = A[0];
- float A1 = A[0+1];
- float A2 = A[0+a_off];
- float A3 = A[0+a_off+1];
- float A4 = A[0+a_off*2+0];
- float A5 = A[0+a_off*2+1];
- float A6 = A[0+a_off*3+0];
- float A7 = A[0+a_off*3+1];
-
- float k00,k11;
-
- float *ee0 = e +i_off;
- float *ee2 = ee0+k_off;
-
- for (i=n; i > 0; --i) {
- k00 = ee0[ 0] - ee2[ 0];
- k11 = ee0[-1] - ee2[-1];
- ee0[ 0] = ee0[ 0] + ee2[ 0];
- ee0[-1] = ee0[-1] + ee2[-1];
- ee2[ 0] = (k00) * A0 - (k11) * A1;
- ee2[-1] = (k11) * A0 + (k00) * A1;
-
- k00 = ee0[-2] - ee2[-2];
- k11 = ee0[-3] - ee2[-3];
- ee0[-2] = ee0[-2] + ee2[-2];
- ee0[-3] = ee0[-3] + ee2[-3];
- ee2[-2] = (k00) * A2 - (k11) * A3;
- ee2[-3] = (k11) * A2 + (k00) * A3;
-
- k00 = ee0[-4] - ee2[-4];
- k11 = ee0[-5] - ee2[-5];
- ee0[-4] = ee0[-4] + ee2[-4];
- ee0[-5] = ee0[-5] + ee2[-5];
- ee2[-4] = (k00) * A4 - (k11) * A5;
- ee2[-5] = (k11) * A4 + (k00) * A5;
-
- k00 = ee0[-6] - ee2[-6];
- k11 = ee0[-7] - ee2[-7];
- ee0[-6] = ee0[-6] + ee2[-6];
- ee0[-7] = ee0[-7] + ee2[-7];
- ee2[-6] = (k00) * A6 - (k11) * A7;
- ee2[-7] = (k11) * A6 + (k00) * A7;
-
- ee0 -= k0;
- ee2 -= k0;
- }
-}
-
-static __forceinline void stbv_iter_54(float *z)
-{
- float k00,k11,k22,k33;
- float y0,y1,y2,y3;
-
- k00 = z[ 0] - z[-4];
- y0 = z[ 0] + z[-4];
- y2 = z[-2] + z[-6];
- k22 = z[-2] - z[-6];
-
- z[-0] = y0 + y2; // z0 + z4 + z2 + z6
- z[-2] = y0 - y2; // z0 + z4 - z2 - z6
-
- // done with y0,y2
-
- k33 = z[-3] - z[-7];
-
- z[-4] = k00 + k33; // z0 - z4 + z3 - z7
- z[-6] = k00 - k33; // z0 - z4 - z3 + z7
-
- // done with k33
-
- k11 = z[-1] - z[-5];
- y1 = z[-1] + z[-5];
- y3 = z[-3] + z[-7];
-
- z[-1] = y1 + y3; // z1 + z5 + z3 + z7
- z[-3] = y1 - y3; // z1 + z5 - z3 - z7
- z[-5] = k11 - k22; // z1 - z5 + z2 - z6
- z[-7] = k11 + k22; // z1 - z5 - z2 + z6
-}
-
-static void stbv_imdct_step3_inner_s_loop_ld654(int n, float *e, int i_off, float *A, int base_n)
-{
- int a_off = base_n >> 3;
- float A2 = A[0+a_off];
- float *z = e + i_off;
- float *base = z - 16 * n;
-
- while (z > base) {
- float k00,k11;
-
- k00 = z[-0] - z[-8];
- k11 = z[-1] - z[-9];
- z[-0] = z[-0] + z[-8];
- z[-1] = z[-1] + z[-9];
- z[-8] = k00;
- z[-9] = k11 ;
-
- k00 = z[ -2] - z[-10];
- k11 = z[ -3] - z[-11];
- z[ -2] = z[ -2] + z[-10];
- z[ -3] = z[ -3] + z[-11];
- z[-10] = (k00+k11) * A2;
- z[-11] = (k11-k00) * A2;
-
- k00 = z[-12] - z[ -4]; // reverse to avoid a unary negation
- k11 = z[ -5] - z[-13];
- z[ -4] = z[ -4] + z[-12];
- z[ -5] = z[ -5] + z[-13];
- z[-12] = k11;
- z[-13] = k00;
-
- k00 = z[-14] - z[ -6]; // reverse to avoid a unary negation
- k11 = z[ -7] - z[-15];
- z[ -6] = z[ -6] + z[-14];
- z[ -7] = z[ -7] + z[-15];
- z[-14] = (k00+k11) * A2;
- z[-15] = (k00-k11) * A2;
-
- stbv_iter_54(z);
- stbv_iter_54(z-8);
- z -= 16;
- }
-}
-
-static void stbv_inverse_mdct(float *buffer, int n, stbv_vorb *f, int blocktype)
-{
- int n2 = n >> 1, n4 = n >> 2, n8 = n >> 3, l;
- int ld;
- // @OPTIMIZE: reduce register pressure by using fewer variables?
- int save_point = stbv_temp_alloc_save(f);
- float *buf2 = (float *) stbv_temp_alloc(f, n2 * sizeof(*buf2));
- float *u=NULL,*v=NULL;
- // twiddle factors
- float *A = f->A[blocktype];
-
- // IMDCT algorithm from "The use of multirate filter banks for coding of high quality digital audio"
- // See notes about bugs in that paper in less-optimal implementation 'inverse_mdct_old' after this function.
-
- // kernel from paper
-
-
- // merged:
- // copy and reflect spectral data
- // step 0
-
- // note that it turns out that the items added together during
- // this step are, in fact, being added to themselves (as reflected
- // by step 0). inexplicable inefficiency! this became obvious
- // once I combined the passes.
-
- // so there's a missing 'times 2' here (for adding X to itself).
- // this propogates through linearly to the end, where the numbers
- // are 1/2 too small, and need to be compensated for.
-
- {
- float *d,*e, *AA, *e_stop;
- d = &buf2[n2-2];
- AA = A;
- e = &buffer[0];
- e_stop = &buffer[n2];
- while (e != e_stop) {
- d[1] = (e[0] * AA[0] - e[2]*AA[1]);
- d[0] = (e[0] * AA[1] + e[2]*AA[0]);
- d -= 2;
- AA += 2;
- e += 4;
- }
-
- e = &buffer[n2-3];
- while (d >= buf2) {
- d[1] = (-e[2] * AA[0] - -e[0]*AA[1]);
- d[0] = (-e[2] * AA[1] + -e[0]*AA[0]);
- d -= 2;
- AA += 2;
- e -= 4;
- }
- }
-
- // now we use symbolic names for these, so that we can
- // possibly swap their meaning as we change which operations
- // are in place
-
- u = buffer;
- v = buf2;
-
- // step 2 (paper output is w, now u)
- // this could be in place, but the data ends up in the wrong
- // place... _somebody_'s got to swap it, so this is nominated
- {
- float *AA = &A[n2-8];
- float *d0,*d1, *e0, *e1;
-
- e0 = &v[n4];
- e1 = &v[0];
-
- d0 = &u[n4];
- d1 = &u[0];
-
- while (AA >= A) {
- float v40_20, v41_21;
-
- v41_21 = e0[1] - e1[1];
- v40_20 = e0[0] - e1[0];
- d0[1] = e0[1] + e1[1];
- d0[0] = e0[0] + e1[0];
- d1[1] = v41_21*AA[4] - v40_20*AA[5];
- d1[0] = v40_20*AA[4] + v41_21*AA[5];
-
- v41_21 = e0[3] - e1[3];
- v40_20 = e0[2] - e1[2];
- d0[3] = e0[3] + e1[3];
- d0[2] = e0[2] + e1[2];
- d1[3] = v41_21*AA[0] - v40_20*AA[1];
- d1[2] = v40_20*AA[0] + v41_21*AA[1];
-
- AA -= 8;
-
- d0 += 4;
- d1 += 4;
- e0 += 4;
- e1 += 4;
- }
- }
-
- // step 3
- ld = stbv_ilog(n) - 1; // stbv_ilog is off-by-one from normal definitions
-
- // optimized step 3:
-
- // the original step3 loop can be nested r inside s or s inside r;
- // it's written originally as s inside r, but this is dumb when r
- // iterates many times, and s few. So I have two copies of it and
- // switch between them halfway.
-
- // this is iteration 0 of step 3
- stbv_imdct_step3_iter0_loop(n >> 4, u, n2-1-n4*0, -(n >> 3), A);
- stbv_imdct_step3_iter0_loop(n >> 4, u, n2-1-n4*1, -(n >> 3), A);
-
- // this is iteration 1 of step 3
- stbv_imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*0, -(n >> 4), A, 16);
- stbv_imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*1, -(n >> 4), A, 16);
- stbv_imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*2, -(n >> 4), A, 16);
- stbv_imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*3, -(n >> 4), A, 16);
-
- l=2;
- for (; l < (ld-3)>>1; ++l) {
- int k0 = n >> (l+2), k0_2 = k0>>1;
- int lim = 1 << (l+1);
- int i;
- for (i=0; i < lim; ++i)
- stbv_imdct_step3_inner_r_loop(n >> (l+4), u, n2-1 - k0*i, -k0_2, A, 1 << (l+3));
- }
-
- for (; l < ld-6; ++l) {
- int k0 = n >> (l+2), k1 = 1 << (l+3), k0_2 = k0>>1;
- int rlim = n >> (l+6), r;
- int lim = 1 << (l+1);
- int i_off;
- float *A0 = A;
- i_off = n2-1;
- for (r=rlim; r > 0; --r) {
- stbv_imdct_step3_inner_s_loop(lim, u, i_off, -k0_2, A0, k1, k0);
- A0 += k1*4;
- i_off -= 8;
- }
- }
-
- // iterations with count:
- // ld-6,-5,-4 all interleaved together
- // the big win comes from getting rid of needless flops
- // due to the constants on pass 5 & 4 being all 1 and 0;
- // combining them to be simultaneous to improve cache made little difference
- stbv_imdct_step3_inner_s_loop_ld654(n >> 5, u, n2-1, A, n);
-
- // output is u
-
- // step 4, 5, and 6
- // cannot be in-place because of step 5
- {
- stbv_uint16 *bitrev = f->stbv_bit_reverse[blocktype];
- // weirdly, I'd have thought reading sequentially and writing
- // erratically would have been better than vice-versa, but in
- // fact that's not what my testing showed. (That is, with
- // j = bitreverse(i), do you read i and write j, or read j and write i.)
-
- float *d0 = &v[n4-4];
- float *d1 = &v[n2-4];
- while (d0 >= v) {
- int k4;
-
- k4 = bitrev[0];
- d1[3] = u[k4+0];
- d1[2] = u[k4+1];
- d0[3] = u[k4+2];
- d0[2] = u[k4+3];
-
- k4 = bitrev[1];
- d1[1] = u[k4+0];
- d1[0] = u[k4+1];
- d0[1] = u[k4+2];
- d0[0] = u[k4+3];
-
- d0 -= 4;
- d1 -= 4;
- bitrev += 2;
- }
- }
- // (paper output is u, now v)
-
-
- // data must be in buf2
- assert(v == buf2);
-
- // step 7 (paper output is v, now v)
- // this is now in place
- {
- float *C = f->C[blocktype];
- float *d, *e;
-
- d = v;
- e = v + n2 - 4;
-
- while (d < e) {
- float a02,a11,b0,b1,b2,b3;
-
- a02 = d[0] - e[2];
- a11 = d[1] + e[3];
-
- b0 = C[1]*a02 + C[0]*a11;
- b1 = C[1]*a11 - C[0]*a02;
-
- b2 = d[0] + e[ 2];
- b3 = d[1] - e[ 3];
-
- d[0] = b2 + b0;
- d[1] = b3 + b1;
- e[2] = b2 - b0;
- e[3] = b1 - b3;
-
- a02 = d[2] - e[0];
- a11 = d[3] + e[1];
-
- b0 = C[3]*a02 + C[2]*a11;
- b1 = C[3]*a11 - C[2]*a02;
-
- b2 = d[2] + e[ 0];
- b3 = d[3] - e[ 1];
-
- d[2] = b2 + b0;
- d[3] = b3 + b1;
- e[0] = b2 - b0;
- e[1] = b1 - b3;
-
- C += 4;
- d += 4;
- e -= 4;
- }
- }
-
- // data must be in buf2
-
-
- // step 8+decode (paper output is X, now buffer)
- // this generates pairs of data a la 8 and pushes them directly through
- // the decode kernel (pushing rather than pulling) to avoid having
- // to make another pass later
-
- // this cannot POSSIBLY be in place, so we refer to the buffers directly
-
- {
- float *d0,*d1,*d2,*d3;
-
- float *B = f->B[blocktype] + n2 - 8;
- float *e = buf2 + n2 - 8;
- d0 = &buffer[0];
- d1 = &buffer[n2-4];
- d2 = &buffer[n2];
- d3 = &buffer[n-4];
- while (e >= v) {
- float p0,p1,p2,p3;
-
- p3 = e[6]*B[7] - e[7]*B[6];
- p2 = -e[6]*B[6] - e[7]*B[7];
-
- d0[0] = p3;
- d1[3] = - p3;
- d2[0] = p2;
- d3[3] = p2;
-
- p1 = e[4]*B[5] - e[5]*B[4];
- p0 = -e[4]*B[4] - e[5]*B[5];
-
- d0[1] = p1;
- d1[2] = - p1;
- d2[1] = p0;
- d3[2] = p0;
-
- p3 = e[2]*B[3] - e[3]*B[2];
- p2 = -e[2]*B[2] - e[3]*B[3];
-
- d0[2] = p3;
- d1[1] = - p3;
- d2[2] = p2;
- d3[1] = p2;
-
- p1 = e[0]*B[1] - e[1]*B[0];
- p0 = -e[0]*B[0] - e[1]*B[1];
-
- d0[3] = p1;
- d1[0] = - p1;
- d2[3] = p0;
- d3[0] = p0;
-
- B -= 8;
- e -= 8;
- d0 += 4;
- d2 += 4;
- d1 -= 4;
- d3 -= 4;
- }
- }
-
- stbv_temp_free(f,buf2);
- stbv_temp_alloc_restore(f,save_point);
-}
-
-#if 0
-// this is the original version of the above code, if you want to optimize it from scratch
-void inverse_mdct_naive(float *buffer, int n)
-{
- float s;
- float A[1 << 12], B[1 << 12], C[1 << 11];
- int i,k,k2,k4, n2 = n >> 1, n4 = n >> 2, n8 = n >> 3, l;
- int n3_4 = n - n4, ld;
- // how can they claim this only uses N words?!
- // oh, because they're only used sparsely, whoops
- float u[1 << 13], X[1 << 13], v[1 << 13], w[1 << 13];
- // set up twiddle factors
-
- for (k=k2=0; k < n4; ++k,k2+=2) {
- A[k2 ] = (float) cos(4*k*M_PI/n);
- A[k2+1] = (float) -sin(4*k*M_PI/n);
- B[k2 ] = (float) cos((k2+1)*M_PI/n/2);
- B[k2+1] = (float) sin((k2+1)*M_PI/n/2);
- }
- for (k=k2=0; k < n8; ++k,k2+=2) {
- C[k2 ] = (float) cos(2*(k2+1)*M_PI/n);
- C[k2+1] = (float) -sin(2*(k2+1)*M_PI/n);
- }
-
- // IMDCT algorithm from "The use of multirate filter banks for coding of high quality digital audio"
- // Note there are bugs in that pseudocode, presumably due to them attempting
- // to rename the arrays nicely rather than representing the way their actual
- // implementation bounces buffers back and forth. As a result, even in the
- // "some formulars corrected" version, a direct implementation fails. These
- // are noted below as "paper bug".
-
- // copy and reflect spectral data
- for (k=0; k < n2; ++k) u[k] = buffer[k];
- for ( ; k < n ; ++k) u[k] = -buffer[n - k - 1];
- // kernel from paper
- // step 1
- for (k=k2=k4=0; k < n4; k+=1, k2+=2, k4+=4) {
- v[n-k4-1] = (u[k4] - u[n-k4-1]) * A[k2] - (u[k4+2] - u[n-k4-3])*A[k2+1];
- v[n-k4-3] = (u[k4] - u[n-k4-1]) * A[k2+1] + (u[k4+2] - u[n-k4-3])*A[k2];
- }
- // step 2
- for (k=k4=0; k < n8; k+=1, k4+=4) {
- w[n2+3+k4] = v[n2+3+k4] + v[k4+3];
- w[n2+1+k4] = v[n2+1+k4] + v[k4+1];
- w[k4+3] = (v[n2+3+k4] - v[k4+3])*A[n2-4-k4] - (v[n2+1+k4]-v[k4+1])*A[n2-3-k4];
- w[k4+1] = (v[n2+1+k4] - v[k4+1])*A[n2-4-k4] + (v[n2+3+k4]-v[k4+3])*A[n2-3-k4];
- }
- // step 3
- ld = stbv_ilog(n) - 1; // stbv_ilog is off-by-one from normal definitions
- for (l=0; l < ld-3; ++l) {
- int k0 = n >> (l+2), k1 = 1 << (l+3);
- int rlim = n >> (l+4), r4, r;
- int s2lim = 1 << (l+2), s2;
- for (r=r4=0; r < rlim; r4+=4,++r) {
- for (s2=0; s2 < s2lim; s2+=2) {
- u[n-1-k0*s2-r4] = w[n-1-k0*s2-r4] + w[n-1-k0*(s2+1)-r4];
- u[n-3-k0*s2-r4] = w[n-3-k0*s2-r4] + w[n-3-k0*(s2+1)-r4];
- u[n-1-k0*(s2+1)-r4] = (w[n-1-k0*s2-r4] - w[n-1-k0*(s2+1)-r4]) * A[r*k1]
- - (w[n-3-k0*s2-r4] - w[n-3-k0*(s2+1)-r4]) * A[r*k1+1];
- u[n-3-k0*(s2+1)-r4] = (w[n-3-k0*s2-r4] - w[n-3-k0*(s2+1)-r4]) * A[r*k1]
- + (w[n-1-k0*s2-r4] - w[n-1-k0*(s2+1)-r4]) * A[r*k1+1];
- }
- }
- if (l+1 < ld-3) {
- // paper bug: ping-ponging of u&w here is omitted
- memcpy(w, u, sizeof(u));
- }
- }
-
- // step 4
- for (i=0; i < n8; ++i) {
- int j = stbv_bit_reverse(i) >> (32-ld+3);
- assert(j < n8);
- if (i == j) {
- // paper bug: original code probably swapped in place; if copying,
- // need to directly copy in this case
- int i8 = i << 3;
- v[i8+1] = u[i8+1];
- v[i8+3] = u[i8+3];
- v[i8+5] = u[i8+5];
- v[i8+7] = u[i8+7];
- } else if (i < j) {
- int i8 = i << 3, j8 = j << 3;
- v[j8+1] = u[i8+1], v[i8+1] = u[j8 + 1];
- v[j8+3] = u[i8+3], v[i8+3] = u[j8 + 3];
- v[j8+5] = u[i8+5], v[i8+5] = u[j8 + 5];
- v[j8+7] = u[i8+7], v[i8+7] = u[j8 + 7];
- }
- }
- // step 5
- for (k=0; k < n2; ++k) {
- w[k] = v[k*2+1];
- }
- // step 6
- for (k=k2=k4=0; k < n8; ++k, k2 += 2, k4 += 4) {
- u[n-1-k2] = w[k4];
- u[n-2-k2] = w[k4+1];
- u[n3_4 - 1 - k2] = w[k4+2];
- u[n3_4 - 2 - k2] = w[k4+3];
- }
- // step 7
- for (k=k2=0; k < n8; ++k, k2 += 2) {
- v[n2 + k2 ] = ( u[n2 + k2] + u[n-2-k2] + C[k2+1]*(u[n2+k2]-u[n-2-k2]) + C[k2]*(u[n2+k2+1]+u[n-2-k2+1]))/2;
- v[n-2 - k2] = ( u[n2 + k2] + u[n-2-k2] - C[k2+1]*(u[n2+k2]-u[n-2-k2]) - C[k2]*(u[n2+k2+1]+u[n-2-k2+1]))/2;
- v[n2+1+ k2] = ( u[n2+1+k2] - u[n-1-k2] + C[k2+1]*(u[n2+1+k2]+u[n-1-k2]) - C[k2]*(u[n2+k2]-u[n-2-k2]))/2;
- v[n-1 - k2] = (-u[n2+1+k2] + u[n-1-k2] + C[k2+1]*(u[n2+1+k2]+u[n-1-k2]) - C[k2]*(u[n2+k2]-u[n-2-k2]))/2;
- }
- // step 8
- for (k=k2=0; k < n4; ++k,k2 += 2) {
- X[k] = v[k2+n2]*B[k2 ] + v[k2+1+n2]*B[k2+1];
- X[n2-1-k] = v[k2+n2]*B[k2+1] - v[k2+1+n2]*B[k2 ];
- }
-
- // decode kernel to output
- // determined the following value experimentally
- // (by first figuring out what made inverse_mdct_slow work); then matching that here
- // (probably vorbis encoder premultiplies by n or n/2, to save it on the decoder?)
- s = 0.5; // theoretically would be n4
-
- // [[[ note! the s value of 0.5 is compensated for by the B[] in the current code,
- // so it needs to use the "old" B values to behave correctly, or else
- // set s to 1.0 ]]]
- for (i=0; i < n4 ; ++i) buffer[i] = s * X[i+n4];
- for ( ; i < n3_4; ++i) buffer[i] = -s * X[n3_4 - i - 1];
- for ( ; i < n ; ++i) buffer[i] = -s * X[i - n3_4];
-}
-#endif
-
-static float *stbv_get_window(stbv_vorb *f, int len)
-{
- len <<= 1;
- if (len == f->blocksize_0) return f->window[0];
- if (len == f->blocksize_1) return f->window[1];
- assert(0);
- return NULL;
-}
-
-#ifndef STB_VORBIS_NO_DEFER_FLOOR
-typedef stbv_int16 STBV_YTYPE;
-#else
-typedef int STBV_YTYPE;
-#endif
-static int stbv_do_floor(stbv_vorb *f, StbvMapping *map, int i, int n, float *target, STBV_YTYPE *finalY, stbv_uint8 *step2_flag)
-{
- int n2 = n >> 1;
- int s = map->chan[i].mux, floor;
- floor = map->submap_floor[s];
- if (f->floor_types[floor] == 0) {
- return stbv_error(f, VORBIS_invalid_stream);
- } else {
- StbvFloor1 *g = &f->floor_config[floor].floor1;
- int j,q;
- int lx = 0, ly = finalY[0] * g->floor1_multiplier;
- for (q=1; q < g->values; ++q) {
- j = g->sorted_order[q];
- #ifndef STB_VORBIS_NO_DEFER_FLOOR
- if (finalY[j] >= 0)
- #else
- if (step2_flag[j])
- #endif
- {
- int hy = finalY[j] * g->floor1_multiplier;
- int hx = g->Xlist[j];
- if (lx != hx)
- stbv_draw_line(target, lx,ly, hx,hy, n2);
- STBV_CHECK(f);
- lx = hx, ly = hy;
- }
- }
- if (lx < n2) {
- // optimization of: stbv_draw_line(target, lx,ly, n,ly, n2);
- for (j=lx; j < n2; ++j)
- STBV_LINE_OP(target[j], stbv_inverse_db_table[ly]);
- STBV_CHECK(f);
- }
- }
- return TRUE;
-}
-
-// The meaning of "left" and "right"
-//
-// For a given frame:
-// we compute samples from 0..n
-// window_center is n/2
-// we'll window and mix the samples from left_start to left_end with data from the previous frame
-// all of the samples from left_end to right_start can be output without mixing; however,
-// this interval is 0-length except when transitioning between short and long frames
-// all of the samples from right_start to right_end need to be mixed with the next frame,
-// which we don't have, so those get saved in a buffer
-// frame N's right_end-right_start, the number of samples to mix with the next frame,
-// has to be the same as frame N+1's left_end-left_start (which they are by
-// construction)
-
-static int stbv_vorbis_decode_initial(stbv_vorb *f, int *p_left_start, int *p_left_end, int *p_right_start, int *p_right_end, int *mode)
-{
- StbvMode *m;
- int i, n, prev, next, window_center;
- f->channel_buffer_start = f->channel_buffer_end = 0;
-
- retry:
- if (f->eof) return FALSE;
- if (!stbv_maybe_start_packet(f))
- return FALSE;
- // check packet type
- if (stbv_get_bits(f,1) != 0) {
- if (STBV_IS_PUSH_MODE(f))
- return stbv_error(f,VORBIS_bad_packet_type);
- while (STBV_EOP != stbv_get8_packet(f));
- goto retry;
- }
-
- if (f->alloc.alloc_buffer)
- assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset);
-
- i = stbv_get_bits(f, stbv_ilog(f->mode_count-1));
- if (i == STBV_EOP) return FALSE;
- if (i >= f->mode_count) return FALSE;
- *mode = i;
- m = f->mode_config + i;
- if (m->blockflag) {
- n = f->blocksize_1;
- prev = stbv_get_bits(f,1);
- next = stbv_get_bits(f,1);
- } else {
- prev = next = 0;
- n = f->blocksize_0;
- }
-
-// WINDOWING
-
- window_center = n >> 1;
- if (m->blockflag && !prev) {
- *p_left_start = (n - f->blocksize_0) >> 2;
- *p_left_end = (n + f->blocksize_0) >> 2;
- } else {
- *p_left_start = 0;
- *p_left_end = window_center;
- }
- if (m->blockflag && !next) {
- *p_right_start = (n*3 - f->blocksize_0) >> 2;
- *p_right_end = (n*3 + f->blocksize_0) >> 2;
- } else {
- *p_right_start = window_center;
- *p_right_end = n;
- }
-
- return TRUE;
-}
-
-static int stbv_vorbis_decode_packet_rest(stbv_vorb *f, int *len, StbvMode *m, int left_start, int left_end, int right_start, int right_end, int *p_left)
-{
- StbvMapping *map;
- int i,j,k,n,n2;
- int zero_channel[256];
- int really_zero_channel[256];
-
-// WINDOWING
-
- n = f->blocksize[m->blockflag];
- map = &f->mapping[m->mapping];
-
-// FLOORS
- n2 = n >> 1;
-
- STBV_CHECK(f);
-
- for (i=0; i < f->channels; ++i) {
- int s = map->chan[i].mux, floor;
- zero_channel[i] = FALSE;
- floor = map->submap_floor[s];
- if (f->floor_types[floor] == 0) {
- return stbv_error(f, VORBIS_invalid_stream);
- } else {
- StbvFloor1 *g = &f->floor_config[floor].floor1;
- if (stbv_get_bits(f, 1)) {
- short *finalY;
- stbv_uint8 step2_flag[256];
- static int range_list[4] = { 256, 128, 86, 64 };
- int range = range_list[g->floor1_multiplier-1];
- int offset = 2;
- finalY = f->finalY[i];
- finalY[0] = stbv_get_bits(f, stbv_ilog(range)-1);
- finalY[1] = stbv_get_bits(f, stbv_ilog(range)-1);
- for (j=0; j < g->partitions; ++j) {
- int pclass = g->partition_class_list[j];
- int cdim = g->class_dimensions[pclass];
- int cbits = g->class_subclasses[pclass];
- int csub = (1 << cbits)-1;
- int cval = 0;
- if (cbits) {
- StbvCodebook *c = f->codebooks + g->class_masterbooks[pclass];
- STBV_DECODE(cval,f,c);
- }
- for (k=0; k < cdim; ++k) {
- int book = g->subclass_books[pclass][cval & csub];
- cval = cval >> cbits;
- if (book >= 0) {
- int temp;
- StbvCodebook *c = f->codebooks + book;
- STBV_DECODE(temp,f,c);
- finalY[offset++] = temp;
- } else
- finalY[offset++] = 0;
- }
- }
- if (f->valid_bits == STBV_INVALID_BITS) goto error; // behavior according to spec
- step2_flag[0] = step2_flag[1] = 1;
- for (j=2; j < g->values; ++j) {
- int low, high, pred, highroom, lowroom, room, val;
- low = g->stbv_neighbors[j][0];
- high = g->stbv_neighbors[j][1];
- //stbv_neighbors(g->Xlist, j, &low, &high);
- pred = stbv_predict_point(g->Xlist[j], g->Xlist[low], g->Xlist[high], finalY[low], finalY[high]);
- val = finalY[j];
- highroom = range - pred;
- lowroom = pred;
- if (highroom < lowroom)
- room = highroom * 2;
- else
- room = lowroom * 2;
- if (val) {
- step2_flag[low] = step2_flag[high] = 1;
- step2_flag[j] = 1;
- if (val >= room)
- if (highroom > lowroom)
- finalY[j] = val - lowroom + pred;
- else
- finalY[j] = pred - val + highroom - 1;
- else
- if (val & 1)
- finalY[j] = pred - ((val+1)>>1);
- else
- finalY[j] = pred + (val>>1);
- } else {
- step2_flag[j] = 0;
- finalY[j] = pred;
- }
- }
-
-#ifdef STB_VORBIS_NO_DEFER_FLOOR
- stbv_do_floor(f, map, i, n, f->floor_buffers[i], finalY, step2_flag);
-#else
- // defer final floor computation until _after_ residue
- for (j=0; j < g->values; ++j) {
- if (!step2_flag[j])
- finalY[j] = -1;
- }
-#endif
- } else {
- error:
- zero_channel[i] = TRUE;
- }
- // So we just defer everything else to later
-
- // at this point we've decoded the floor into buffer
- }
- }
- STBV_CHECK(f);
- // at this point we've decoded all floors
-
- if (f->alloc.alloc_buffer)
- assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset);
-
- // re-enable coupled channels if necessary
- memcpy(really_zero_channel, zero_channel, sizeof(really_zero_channel[0]) * f->channels);
- for (i=0; i < map->coupling_steps; ++i)
- if (!zero_channel[map->chan[i].magnitude] || !zero_channel[map->chan[i].angle]) {
- zero_channel[map->chan[i].magnitude] = zero_channel[map->chan[i].angle] = FALSE;
- }
-
- STBV_CHECK(f);
-// RESIDUE STBV_DECODE
- for (i=0; i < map->submaps; ++i) {
- float *residue_buffers[STB_VORBIS_MAX_CHANNELS];
- int r;
- stbv_uint8 do_not_decode[256];
- int ch = 0;
- for (j=0; j < f->channels; ++j) {
- if (map->chan[j].mux == i) {
- if (zero_channel[j]) {
- do_not_decode[ch] = TRUE;
- residue_buffers[ch] = NULL;
- } else {
- do_not_decode[ch] = FALSE;
- residue_buffers[ch] = f->channel_buffers[j];
- }
- ++ch;
- }
- }
- r = map->submap_residue[i];
- stbv_decode_residue(f, residue_buffers, ch, n2, r, do_not_decode);
- }
-
- if (f->alloc.alloc_buffer)
- assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset);
- STBV_CHECK(f);
-
-// INVERSE COUPLING
- for (i = map->coupling_steps-1; i >= 0; --i) {
- int n2 = n >> 1;
- float *m = f->channel_buffers[map->chan[i].magnitude];
- float *a = f->channel_buffers[map->chan[i].angle ];
- for (j=0; j < n2; ++j) {
- float a2,m2;
- if (m[j] > 0)
- if (a[j] > 0)
- m2 = m[j], a2 = m[j] - a[j];
- else
- a2 = m[j], m2 = m[j] + a[j];
- else
- if (a[j] > 0)
- m2 = m[j], a2 = m[j] + a[j];
- else
- a2 = m[j], m2 = m[j] - a[j];
- m[j] = m2;
- a[j] = a2;
- }
- }
- STBV_CHECK(f);
-
- // finish decoding the floors
-#ifndef STB_VORBIS_NO_DEFER_FLOOR
- for (i=0; i < f->channels; ++i) {
- if (really_zero_channel[i]) {
- memset(f->channel_buffers[i], 0, sizeof(*f->channel_buffers[i]) * n2);
- } else {
- stbv_do_floor(f, map, i, n, f->channel_buffers[i], f->finalY[i], NULL);
- }
- }
-#else
- for (i=0; i < f->channels; ++i) {
- if (really_zero_channel[i]) {
- memset(f->channel_buffers[i], 0, sizeof(*f->channel_buffers[i]) * n2);
- } else {
- for (j=0; j < n2; ++j)
- f->channel_buffers[i][j] *= f->floor_buffers[i][j];
- }
- }
-#endif
-
-// INVERSE MDCT
- STBV_CHECK(f);
- for (i=0; i < f->channels; ++i)
- stbv_inverse_mdct(f->channel_buffers[i], n, f, m->blockflag);
- STBV_CHECK(f);
-
- // this shouldn't be necessary, unless we exited on an error
- // and want to flush to get to the next packet
- stbv_flush_packet(f);
-
- if (f->first_decode) {
- // assume we start so first non-discarded sample is sample 0
- // this isn't to spec, but spec would require us to read ahead
- // and decode the size of all current frames--could be done,
- // but presumably it's not a commonly used feature
- f->current_loc = -n2; // start of first frame is positioned for discard
- // we might have to discard samples "from" the next frame too,
- // if we're lapping a large block then a small at the start?
- f->discard_samples_deferred = n - right_end;
- f->current_loc_valid = TRUE;
- f->first_decode = FALSE;
- } else if (f->discard_samples_deferred) {
- if (f->discard_samples_deferred >= right_start - left_start) {
- f->discard_samples_deferred -= (right_start - left_start);
- left_start = right_start;
- *p_left = left_start;
- } else {
- left_start += f->discard_samples_deferred;
- *p_left = left_start;
- f->discard_samples_deferred = 0;
- }
- } else if (f->previous_length == 0 && f->current_loc_valid) {
- // we're recovering from a seek... that means we're going to discard
- // the samples from this packet even though we know our position from
- // the last page header, so we need to update the position based on
- // the discarded samples here
- // but wait, the code below is going to add this in itself even
- // on a discard, so we don't need to do it here...
- }
-
- // check if we have ogg information about the sample # for this packet
- if (f->last_seg_which == f->end_seg_with_known_loc) {
- // if we have a valid current loc, and this is final:
- if (f->current_loc_valid && (f->page_flag & STBV_PAGEFLAG_last_page)) {
- stbv_uint32 current_end = f->known_loc_for_packet;
- // then let's infer the size of the (probably) short final frame
- if (current_end < f->current_loc + (right_end-left_start)) {
- if (current_end < f->current_loc) {
- // negative truncation, that's impossible!
- *len = 0;
- } else {
- *len = current_end - f->current_loc;
- }
- *len += left_start; // this doesn't seem right, but has no ill effect on my test files
- if (*len > right_end) *len = right_end; // this should never happen
- f->current_loc += *len;
- return TRUE;
- }
- }
- // otherwise, just set our sample loc
- // guess that the ogg granule pos refers to the _middle_ of the
- // last frame?
- // set f->current_loc to the position of left_start
- f->current_loc = f->known_loc_for_packet - (n2-left_start);
- f->current_loc_valid = TRUE;
- }
- if (f->current_loc_valid)
- f->current_loc += (right_start - left_start);
-
- if (f->alloc.alloc_buffer)
- assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset);
- *len = right_end; // ignore samples after the window goes to 0
- STBV_CHECK(f);
-
- return TRUE;
-}
-
-static int stbv_vorbis_decode_packet(stbv_vorb *f, int *len, int *p_left, int *p_right)
-{
- int mode, left_end, right_end;
- if (!stbv_vorbis_decode_initial(f, p_left, &left_end, p_right, &right_end, &mode)) return 0;
- return stbv_vorbis_decode_packet_rest(f, len, f->mode_config + mode, *p_left, left_end, *p_right, right_end, p_left);
-}
-
-static int stbv_vorbis_finish_frame(stb_vorbis *f, int len, int left, int right)
-{
- int prev,i,j;
- // we use right&left (the start of the right- and left-window sin()-regions)
- // to determine how much to return, rather than inferring from the rules
- // (same result, clearer code); 'left' indicates where our sin() window
- // starts, therefore where the previous window's right edge starts, and
- // therefore where to start mixing from the previous buffer. 'right'
- // indicates where our sin() ending-window starts, therefore that's where
- // we start saving, and where our returned-data ends.
-
- // mixin from previous window
- if (f->previous_length) {
- int i,j, n = f->previous_length;
- float *w = stbv_get_window(f, n);
- for (i=0; i < f->channels; ++i) {
- for (j=0; j < n; ++j)
- f->channel_buffers[i][left+j] =
- f->channel_buffers[i][left+j]*w[ j] +
- f->previous_window[i][ j]*w[n-1-j];
- }
- }
-
- prev = f->previous_length;
-
- // last half of this data becomes previous window
- f->previous_length = len - right;
-
- // @OPTIMIZE: could avoid this copy by double-buffering the
- // output (flipping previous_window with channel_buffers), but
- // then previous_window would have to be 2x as large, and
- // channel_buffers couldn't be temp mem (although they're NOT
- // currently temp mem, they could be (unless we want to level
- // performance by spreading out the computation))
- for (i=0; i < f->channels; ++i)
- for (j=0; right+j < len; ++j)
- f->previous_window[i][j] = f->channel_buffers[i][right+j];
-
- if (!prev)
- // there was no previous packet, so this data isn't valid...
- // this isn't entirely true, only the would-have-overlapped data
- // isn't valid, but this seems to be what the spec requires
- return 0;
-
- // truncate a short frame
- if (len < right) right = len;
-
- f->samples_output += right-left;
-
- return right - left;
-}
-
-static int stbv_vorbis_pump_first_frame(stb_vorbis *f)
-{
- int len, right, left, res;
- res = stbv_vorbis_decode_packet(f, &len, &left, &right);
- if (res)
- stbv_vorbis_finish_frame(f, len, left, right);
- return res;
-}
-
-#ifndef STB_VORBIS_NO_PUSHDATA_API
-static int stbv_is_whole_packet_present(stb_vorbis *f, int end_page)
-{
- // make sure that we have the packet available before continuing...
- // this requires a full ogg parse, but we know we can fetch from f->stream
-
- // instead of coding this out explicitly, we could save the current read state,
- // read the next packet with stbv_get8() until end-of-packet, check f->eof, then
- // reset the state? but that would be slower, esp. since we'd have over 256 bytes
- // of state to restore (primarily the page segment table)
-
- int s = f->next_seg, first = TRUE;
- stbv_uint8 *p = f->stream;
-
- if (s != -1) { // if we're not starting the packet with a 'continue on next page' flag
- for (; s < f->segment_count; ++s) {
- p += f->segments[s];
- if (f->segments[s] < 255) // stop at first short segment
- break;
- }
- // either this continues, or it ends it...
- if (end_page)
- if (s < f->segment_count-1) return stbv_error(f, VORBIS_invalid_stream);
- if (s == f->segment_count)
- s = -1; // set 'crosses page' flag
- if (p > f->stream_end) return stbv_error(f, VORBIS_need_more_data);
- first = FALSE;
- }
- for (; s == -1;) {
- stbv_uint8 *q;
- int n;
-
- // check that we have the page header ready
- if (p + 26 >= f->stream_end) return stbv_error(f, VORBIS_need_more_data);
- // validate the page
- if (memcmp(p, stbv_ogg_page_header, 4)) return stbv_error(f, VORBIS_invalid_stream);
- if (p[4] != 0) return stbv_error(f, VORBIS_invalid_stream);
- if (first) { // the first segment must NOT have 'continued_packet', later ones MUST
- if (f->previous_length)
- if ((p[5] & STBV_PAGEFLAG_continued_packet)) return stbv_error(f, VORBIS_invalid_stream);
- // if no previous length, we're resynching, so we can come in on a continued-packet,
- // which we'll just drop
- } else {
- if (!(p[5] & STBV_PAGEFLAG_continued_packet)) return stbv_error(f, VORBIS_invalid_stream);
- }
- n = p[26]; // segment counts
- q = p+27; // q points to segment table
- p = q + n; // advance past header
- // make sure we've read the segment table
- if (p > f->stream_end) return stbv_error(f, VORBIS_need_more_data);
- for (s=0; s < n; ++s) {
- p += q[s];
- if (q[s] < 255)
- break;
- }
- if (end_page)
- if (s < n-1) return stbv_error(f, VORBIS_invalid_stream);
- if (s == n)
- s = -1; // set 'crosses page' flag
- if (p > f->stream_end) return stbv_error(f, VORBIS_need_more_data);
- first = FALSE;
- }
- return TRUE;
-}
-#endif // !STB_VORBIS_NO_PUSHDATA_API
-
-static int stbv_start_decoder(stbv_vorb *f)
-{
- stbv_uint8 header[6], x,y;
- int len,i,j,k, max_submaps = 0;
- int longest_floorlist=0;
-
- // first page, first packet
-
- if (!stbv_start_page(f)) return FALSE;
- // validate page flag
- if (!(f->page_flag & STBV_PAGEFLAG_first_page)) return stbv_error(f, VORBIS_invalid_first_page);
- if (f->page_flag & STBV_PAGEFLAG_last_page) return stbv_error(f, VORBIS_invalid_first_page);
- if (f->page_flag & STBV_PAGEFLAG_continued_packet) return stbv_error(f, VORBIS_invalid_first_page);
- // check for expected packet length
- if (f->segment_count != 1) return stbv_error(f, VORBIS_invalid_first_page);
- if (f->segments[0] != 30) return stbv_error(f, VORBIS_invalid_first_page);
- // read packet
- // check packet header
- if (stbv_get8(f) != STBV_VORBIS_packet_id) return stbv_error(f, VORBIS_invalid_first_page);
- if (!stbv_getn(f, header, 6)) return stbv_error(f, VORBIS_unexpected_eof);
- if (!stbv_vorbis_validate(header)) return stbv_error(f, VORBIS_invalid_first_page);
- // vorbis_version
- if (stbv_get32(f) != 0) return stbv_error(f, VORBIS_invalid_first_page);
- f->channels = stbv_get8(f); if (!f->channels) return stbv_error(f, VORBIS_invalid_first_page);
- if (f->channels > STB_VORBIS_MAX_CHANNELS) return stbv_error(f, VORBIS_too_many_channels);
- f->sample_rate = stbv_get32(f); if (!f->sample_rate) return stbv_error(f, VORBIS_invalid_first_page);
- stbv_get32(f); // bitrate_maximum
- stbv_get32(f); // bitrate_nominal
- stbv_get32(f); // bitrate_minimum
- x = stbv_get8(f);
- {
- int log0,log1;
- log0 = x & 15;
- log1 = x >> 4;
- f->blocksize_0 = 1 << log0;
- f->blocksize_1 = 1 << log1;
- if (log0 < 6 || log0 > 13) return stbv_error(f, VORBIS_invalid_setup);
- if (log1 < 6 || log1 > 13) return stbv_error(f, VORBIS_invalid_setup);
- if (log0 > log1) return stbv_error(f, VORBIS_invalid_setup);
- }
-
- // framing_flag
- x = stbv_get8(f);
- if (!(x & 1)) return stbv_error(f, VORBIS_invalid_first_page);
-
- // second packet!
- if (!stbv_start_page(f)) return FALSE;
-
- if (!stbv_start_packet(f)) return FALSE;
- do {
- len = stbv_next_segment(f);
- stbv_skip(f, len);
- f->bytes_in_seg = 0;
- } while (len);
-
- // third packet!
- if (!stbv_start_packet(f)) return FALSE;
-
- #ifndef STB_VORBIS_NO_PUSHDATA_API
- if (STBV_IS_PUSH_MODE(f)) {
- if (!stbv_is_whole_packet_present(f, TRUE)) {
- // convert error in ogg header to write type
- if (f->error == VORBIS_invalid_stream)
- f->error = VORBIS_invalid_setup;
- return FALSE;
- }
- }
- #endif
-
- stbv_crc32_init(); // always init it, to avoid multithread race conditions
-
- if (stbv_get8_packet(f) != STBV_VORBIS_packet_setup) return stbv_error(f, VORBIS_invalid_setup);
- for (i=0; i < 6; ++i) header[i] = stbv_get8_packet(f);
- if (!stbv_vorbis_validate(header)) return stbv_error(f, VORBIS_invalid_setup);
-
- // codebooks
-
- f->codebook_count = stbv_get_bits(f,8) + 1;
- f->codebooks = (StbvCodebook *) stbv_setup_malloc(f, sizeof(*f->codebooks) * f->codebook_count);
- if (f->codebooks == NULL) return stbv_error(f, VORBIS_outofmem);
- memset(f->codebooks, 0, sizeof(*f->codebooks) * f->codebook_count);
- for (i=0; i < f->codebook_count; ++i) {
- stbv_uint32 *values;
- int ordered, sorted_count;
- int total=0;
- stbv_uint8 *lengths;
- StbvCodebook *c = f->codebooks+i;
- STBV_CHECK(f);
- x = stbv_get_bits(f, 8); if (x != 0x42) return stbv_error(f, VORBIS_invalid_setup);
- x = stbv_get_bits(f, 8); if (x != 0x43) return stbv_error(f, VORBIS_invalid_setup);
- x = stbv_get_bits(f, 8); if (x != 0x56) return stbv_error(f, VORBIS_invalid_setup);
- x = stbv_get_bits(f, 8);
- c->dimensions = (stbv_get_bits(f, 8)<<8) + x;
- x = stbv_get_bits(f, 8);
- y = stbv_get_bits(f, 8);
- c->entries = (stbv_get_bits(f, 8)<<16) + (y<<8) + x;
- ordered = stbv_get_bits(f,1);
- c->sparse = ordered ? 0 : stbv_get_bits(f,1);
-
- if (c->dimensions == 0 && c->entries != 0) return stbv_error(f, VORBIS_invalid_setup);
-
- if (c->sparse)
- lengths = (stbv_uint8 *) stbv_setup_temp_malloc(f, c->entries);
- else
- lengths = c->codeword_lengths = (stbv_uint8 *) stbv_setup_malloc(f, c->entries);
-
- if (!lengths) return stbv_error(f, VORBIS_outofmem);
-
- if (ordered) {
- int current_entry = 0;
- int current_length = stbv_get_bits(f,5) + 1;
- while (current_entry < c->entries) {
- int limit = c->entries - current_entry;
- int n = stbv_get_bits(f, stbv_ilog(limit));
- if (current_entry + n > (int) c->entries) { return stbv_error(f, VORBIS_invalid_setup); }
- memset(lengths + current_entry, current_length, n);
- current_entry += n;
- ++current_length;
- }
- } else {
- for (j=0; j < c->entries; ++j) {
- int present = c->sparse ? stbv_get_bits(f,1) : 1;
- if (present) {
- lengths[j] = stbv_get_bits(f, 5) + 1;
- ++total;
- if (lengths[j] == 32)
- return stbv_error(f, VORBIS_invalid_setup);
- } else {
- lengths[j] = NO_CODE;
- }
- }
- }
-
- if (c->sparse && total >= c->entries >> 2) {
- // convert sparse items to non-sparse!
- if (c->entries > (int) f->setup_temp_memory_required)
- f->setup_temp_memory_required = c->entries;
-
- c->codeword_lengths = (stbv_uint8 *) stbv_setup_malloc(f, c->entries);
- if (c->codeword_lengths == NULL) return stbv_error(f, VORBIS_outofmem);
- memcpy(c->codeword_lengths, lengths, c->entries);
- stbv_setup_temp_free(f, lengths, c->entries); // note this is only safe if there have been no intervening temp mallocs!
- lengths = c->codeword_lengths;
- c->sparse = 0;
- }
-
- // compute the size of the sorted tables
- if (c->sparse) {
- sorted_count = total;
- } else {
- sorted_count = 0;
- #ifndef STB_VORBIS_NO_HUFFMAN_BINARY_SEARCH
- for (j=0; j < c->entries; ++j)
- if (lengths[j] > STB_VORBIS_FAST_HUFFMAN_LENGTH && lengths[j] != NO_CODE)
- ++sorted_count;
- #endif
- }
-
- c->sorted_entries = sorted_count;
- values = NULL;
-
- STBV_CHECK(f);
- if (!c->sparse) {
- c->codewords = (stbv_uint32 *) stbv_setup_malloc(f, sizeof(c->codewords[0]) * c->entries);
- if (!c->codewords) return stbv_error(f, VORBIS_outofmem);
- } else {
- unsigned int size;
- if (c->sorted_entries) {
- c->codeword_lengths = (stbv_uint8 *) stbv_setup_malloc(f, c->sorted_entries);
- if (!c->codeword_lengths) return stbv_error(f, VORBIS_outofmem);
- c->codewords = (stbv_uint32 *) stbv_setup_temp_malloc(f, sizeof(*c->codewords) * c->sorted_entries);
- if (!c->codewords) return stbv_error(f, VORBIS_outofmem);
- values = (stbv_uint32 *) stbv_setup_temp_malloc(f, sizeof(*values) * c->sorted_entries);
- if (!values) return stbv_error(f, VORBIS_outofmem);
- }
- size = c->entries + (sizeof(*c->codewords) + sizeof(*values)) * c->sorted_entries;
- if (size > f->setup_temp_memory_required)
- f->setup_temp_memory_required = size;
- }
-
- if (!stbv_compute_codewords(c, lengths, c->entries, values)) {
- if (c->sparse) stbv_setup_temp_free(f, values, 0);
- return stbv_error(f, VORBIS_invalid_setup);
- }
-
- if (c->sorted_entries) {
- // allocate an extra slot for sentinels
- c->sorted_codewords = (stbv_uint32 *) stbv_setup_malloc(f, sizeof(*c->sorted_codewords) * (c->sorted_entries+1));
- if (c->sorted_codewords == NULL) return stbv_error(f, VORBIS_outofmem);
- // allocate an extra slot at the front so that c->sorted_values[-1] is defined
- // so that we can catch that case without an extra if
- c->sorted_values = ( int *) stbv_setup_malloc(f, sizeof(*c->sorted_values ) * (c->sorted_entries+1));
- if (c->sorted_values == NULL) return stbv_error(f, VORBIS_outofmem);
- ++c->sorted_values;
- c->sorted_values[-1] = -1;
- stbv_compute_sorted_huffman(c, lengths, values);
- }
-
- if (c->sparse) {
- stbv_setup_temp_free(f, values, sizeof(*values)*c->sorted_entries);
- stbv_setup_temp_free(f, c->codewords, sizeof(*c->codewords)*c->sorted_entries);
- stbv_setup_temp_free(f, lengths, c->entries);
- c->codewords = NULL;
- }
-
- stbv_compute_accelerated_huffman(c);
-
- STBV_CHECK(f);
- c->lookup_type = stbv_get_bits(f, 4);
- if (c->lookup_type > 2) return stbv_error(f, VORBIS_invalid_setup);
- if (c->lookup_type > 0) {
- stbv_uint16 *mults;
- c->minimum_value = stbv_float32_unpack(stbv_get_bits(f, 32));
- c->delta_value = stbv_float32_unpack(stbv_get_bits(f, 32));
- c->value_bits = stbv_get_bits(f, 4)+1;
- c->sequence_p = stbv_get_bits(f,1);
- if (c->lookup_type == 1) {
- c->lookup_values = stbv_lookup1_values(c->entries, c->dimensions);
- } else {
- c->lookup_values = c->entries * c->dimensions;
- }
- if (c->lookup_values == 0) return stbv_error(f, VORBIS_invalid_setup);
- mults = (stbv_uint16 *) stbv_setup_temp_malloc(f, sizeof(mults[0]) * c->lookup_values);
- if (mults == NULL) return stbv_error(f, VORBIS_outofmem);
- for (j=0; j < (int) c->lookup_values; ++j) {
- int q = stbv_get_bits(f, c->value_bits);
- if (q == STBV_EOP) { stbv_setup_temp_free(f,mults,sizeof(mults[0])*c->lookup_values); return stbv_error(f, VORBIS_invalid_setup); }
- mults[j] = q;
- }
-
-#ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK
- if (c->lookup_type == 1) {
- int len, sparse = c->sparse;
- float last=0;
- // pre-expand the lookup1-style multiplicands, to avoid a divide in the inner loop
- if (sparse) {
- if (c->sorted_entries == 0) goto stbv_skip;
- c->multiplicands = (stbv_codetype *) stbv_setup_malloc(f, sizeof(c->multiplicands[0]) * c->sorted_entries * c->dimensions);
- } else
- c->multiplicands = (stbv_codetype *) stbv_setup_malloc(f, sizeof(c->multiplicands[0]) * c->entries * c->dimensions);
- if (c->multiplicands == NULL) { stbv_setup_temp_free(f,mults,sizeof(mults[0])*c->lookup_values); return stbv_error(f, VORBIS_outofmem); }
- len = sparse ? c->sorted_entries : c->entries;
- for (j=0; j < len; ++j) {
- unsigned int z = sparse ? c->sorted_values[j] : j;
- unsigned int div=1;
- for (k=0; k < c->dimensions; ++k) {
- int off = (z / div) % c->lookup_values;
- float val = mults[off];
- val = mults[off]*c->delta_value + c->minimum_value + last;
- c->multiplicands[j*c->dimensions + k] = val;
- if (c->sequence_p)
- last = val;
- if (k+1 < c->dimensions) {
- if (div > UINT_MAX / (unsigned int) c->lookup_values) {
- stbv_setup_temp_free(f, mults,sizeof(mults[0])*c->lookup_values);
- return stbv_error(f, VORBIS_invalid_setup);
- }
- div *= c->lookup_values;
- }
- }
- }
- c->lookup_type = 2;
- }
- else
-#endif
- {
- float last=0;
- STBV_CHECK(f);
- c->multiplicands = (stbv_codetype *) stbv_setup_malloc(f, sizeof(c->multiplicands[0]) * c->lookup_values);
- if (c->multiplicands == NULL) { stbv_setup_temp_free(f, mults,sizeof(mults[0])*c->lookup_values); return stbv_error(f, VORBIS_outofmem); }
- for (j=0; j < (int) c->lookup_values; ++j) {
- float val = mults[j] * c->delta_value + c->minimum_value + last;
- c->multiplicands[j] = val;
- if (c->sequence_p)
- last = val;
- }
- }
-#ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK
- stbv_skip:;
-#endif
- stbv_setup_temp_free(f, mults, sizeof(mults[0])*c->lookup_values);
-
- STBV_CHECK(f);
- }
- STBV_CHECK(f);
- }
-
- // time domain transfers (notused)
-
- x = stbv_get_bits(f, 6) + 1;
- for (i=0; i < x; ++i) {
- stbv_uint32 z = stbv_get_bits(f, 16);
- if (z != 0) return stbv_error(f, VORBIS_invalid_setup);
- }
-
- // Floors
- f->floor_count = stbv_get_bits(f, 6)+1;
- f->floor_config = (StbvFloor *) stbv_setup_malloc(f, f->floor_count * sizeof(*f->floor_config));
- if (f->floor_config == NULL) return stbv_error(f, VORBIS_outofmem);
- for (i=0; i < f->floor_count; ++i) {
- f->floor_types[i] = stbv_get_bits(f, 16);
- if (f->floor_types[i] > 1) return stbv_error(f, VORBIS_invalid_setup);
- if (f->floor_types[i] == 0) {
- StbvFloor0 *g = &f->floor_config[i].floor0;
- g->order = stbv_get_bits(f,8);
- g->rate = stbv_get_bits(f,16);
- g->bark_map_size = stbv_get_bits(f,16);
- g->amplitude_bits = stbv_get_bits(f,6);
- g->amplitude_offset = stbv_get_bits(f,8);
- g->number_of_books = stbv_get_bits(f,4) + 1;
- for (j=0; j < g->number_of_books; ++j)
- g->book_list[j] = stbv_get_bits(f,8);
- return stbv_error(f, VORBIS_feature_not_supported);
- } else {
- stbv_floor_ordering p[31*8+2];
- StbvFloor1 *g = &f->floor_config[i].floor1;
- int max_class = -1;
- g->partitions = stbv_get_bits(f, 5);
- for (j=0; j < g->partitions; ++j) {
- g->partition_class_list[j] = stbv_get_bits(f, 4);
- if (g->partition_class_list[j] > max_class)
- max_class = g->partition_class_list[j];
- }
- for (j=0; j <= max_class; ++j) {
- g->class_dimensions[j] = stbv_get_bits(f, 3)+1;
- g->class_subclasses[j] = stbv_get_bits(f, 2);
- if (g->class_subclasses[j]) {
- g->class_masterbooks[j] = stbv_get_bits(f, 8);
- if (g->class_masterbooks[j] >= f->codebook_count) return stbv_error(f, VORBIS_invalid_setup);
- }
- for (k=0; k < 1 << g->class_subclasses[j]; ++k) {
- g->subclass_books[j][k] = stbv_get_bits(f,8)-1;
- if (g->subclass_books[j][k] >= f->codebook_count) return stbv_error(f, VORBIS_invalid_setup);
- }
- }
- g->floor1_multiplier = stbv_get_bits(f,2)+1;
- g->rangebits = stbv_get_bits(f,4);
- g->Xlist[0] = 0;
- g->Xlist[1] = 1 << g->rangebits;
- g->values = 2;
- for (j=0; j < g->partitions; ++j) {
- int c = g->partition_class_list[j];
- for (k=0; k < g->class_dimensions[c]; ++k) {
- g->Xlist[g->values] = stbv_get_bits(f, g->rangebits);
- ++g->values;
- }
- }
- // precompute the sorting
- for (j=0; j < g->values; ++j) {
- p[j].x = g->Xlist[j];
- p[j].id = j;
- }
- qsort(p, g->values, sizeof(p[0]), stbv_point_compare);
- for (j=0; j < g->values; ++j)
- g->sorted_order[j] = (stbv_uint8) p[j].id;
- // precompute the stbv_neighbors
- for (j=2; j < g->values; ++j) {
- int low,hi;
- stbv_neighbors(g->Xlist, j, &low,&hi);
- g->stbv_neighbors[j][0] = low;
- g->stbv_neighbors[j][1] = hi;
- }
-
- if (g->values > longest_floorlist)
- longest_floorlist = g->values;
- }
- }
-
- // StbvResidue
- f->residue_count = stbv_get_bits(f, 6)+1;
- f->residue_config = (StbvResidue *) stbv_setup_malloc(f, f->residue_count * sizeof(f->residue_config[0]));
- if (f->residue_config == NULL) return stbv_error(f, VORBIS_outofmem);
- memset(f->residue_config, 0, f->residue_count * sizeof(f->residue_config[0]));
- for (i=0; i < f->residue_count; ++i) {
- stbv_uint8 residue_cascade[64];
- StbvResidue *r = f->residue_config+i;
- f->residue_types[i] = stbv_get_bits(f, 16);
- if (f->residue_types[i] > 2) return stbv_error(f, VORBIS_invalid_setup);
- r->begin = stbv_get_bits(f, 24);
- r->end = stbv_get_bits(f, 24);
- if (r->end < r->begin) return stbv_error(f, VORBIS_invalid_setup);
- r->part_size = stbv_get_bits(f,24)+1;
- r->classifications = stbv_get_bits(f,6)+1;
- r->classbook = stbv_get_bits(f,8);
- if (r->classbook >= f->codebook_count) return stbv_error(f, VORBIS_invalid_setup);
- for (j=0; j < r->classifications; ++j) {
- stbv_uint8 high_bits=0;
- stbv_uint8 low_bits=stbv_get_bits(f,3);
- if (stbv_get_bits(f,1))
- high_bits = stbv_get_bits(f,5);
- residue_cascade[j] = high_bits*8 + low_bits;
- }
- r->residue_books = (short (*)[8]) stbv_setup_malloc(f, sizeof(r->residue_books[0]) * r->classifications);
- if (r->residue_books == NULL) return stbv_error(f, VORBIS_outofmem);
- for (j=0; j < r->classifications; ++j) {
- for (k=0; k < 8; ++k) {
- if (residue_cascade[j] & (1 << k)) {
- r->residue_books[j][k] = stbv_get_bits(f, 8);
- if (r->residue_books[j][k] >= f->codebook_count) return stbv_error(f, VORBIS_invalid_setup);
- } else {
- r->residue_books[j][k] = -1;
- }
- }
- }
- // precompute the classifications[] array to avoid inner-loop mod/divide
- // call it 'classdata' since we already have r->classifications
- r->classdata = (stbv_uint8 **) stbv_setup_malloc(f, sizeof(*r->classdata) * f->codebooks[r->classbook].entries);
- if (!r->classdata) return stbv_error(f, VORBIS_outofmem);
- memset(r->classdata, 0, sizeof(*r->classdata) * f->codebooks[r->classbook].entries);
- for (j=0; j < f->codebooks[r->classbook].entries; ++j) {
- int classwords = f->codebooks[r->classbook].dimensions;
- int temp = j;
- r->classdata[j] = (stbv_uint8 *) stbv_setup_malloc(f, sizeof(r->classdata[j][0]) * classwords);
- if (r->classdata[j] == NULL) return stbv_error(f, VORBIS_outofmem);
- for (k=classwords-1; k >= 0; --k) {
- r->classdata[j][k] = temp % r->classifications;
- temp /= r->classifications;
- }
- }
- }
-
- f->mapping_count = stbv_get_bits(f,6)+1;
- f->mapping = (StbvMapping *) stbv_setup_malloc(f, f->mapping_count * sizeof(*f->mapping));
- if (f->mapping == NULL) return stbv_error(f, VORBIS_outofmem);
- memset(f->mapping, 0, f->mapping_count * sizeof(*f->mapping));
- for (i=0; i < f->mapping_count; ++i) {
- StbvMapping *m = f->mapping + i;
- int mapping_type = stbv_get_bits(f,16);
- if (mapping_type != 0) return stbv_error(f, VORBIS_invalid_setup);
- m->chan = (StbvMappingChannel *) stbv_setup_malloc(f, f->channels * sizeof(*m->chan));
- if (m->chan == NULL) return stbv_error(f, VORBIS_outofmem);
- if (stbv_get_bits(f,1))
- m->submaps = stbv_get_bits(f,4)+1;
- else
- m->submaps = 1;
- if (m->submaps > max_submaps)
- max_submaps = m->submaps;
- if (stbv_get_bits(f,1)) {
- m->coupling_steps = stbv_get_bits(f,8)+1;
- for (k=0; k < m->coupling_steps; ++k) {
- m->chan[k].magnitude = stbv_get_bits(f, stbv_ilog(f->channels-1));
- m->chan[k].angle = stbv_get_bits(f, stbv_ilog(f->channels-1));
- if (m->chan[k].magnitude >= f->channels) return stbv_error(f, VORBIS_invalid_setup);
- if (m->chan[k].angle >= f->channels) return stbv_error(f, VORBIS_invalid_setup);
- if (m->chan[k].magnitude == m->chan[k].angle) return stbv_error(f, VORBIS_invalid_setup);
- }
- } else
- m->coupling_steps = 0;
-
- // reserved field
- if (stbv_get_bits(f,2)) return stbv_error(f, VORBIS_invalid_setup);
- if (m->submaps > 1) {
- for (j=0; j < f->channels; ++j) {
- m->chan[j].mux = stbv_get_bits(f, 4);
- if (m->chan[j].mux >= m->submaps) return stbv_error(f, VORBIS_invalid_setup);
- }
- } else
- // @SPECIFICATION: this case is missing from the spec
- for (j=0; j < f->channels; ++j)
- m->chan[j].mux = 0;
-
- for (j=0; j < m->submaps; ++j) {
- stbv_get_bits(f,8); // discard
- m->submap_floor[j] = stbv_get_bits(f,8);
- m->submap_residue[j] = stbv_get_bits(f,8);
- if (m->submap_floor[j] >= f->floor_count) return stbv_error(f, VORBIS_invalid_setup);
- if (m->submap_residue[j] >= f->residue_count) return stbv_error(f, VORBIS_invalid_setup);
- }
- }
-
- // Modes
- f->mode_count = stbv_get_bits(f, 6)+1;
- for (i=0; i < f->mode_count; ++i) {
- StbvMode *m = f->mode_config+i;
- m->blockflag = stbv_get_bits(f,1);
- m->windowtype = stbv_get_bits(f,16);
- m->transformtype = stbv_get_bits(f,16);
- m->mapping = stbv_get_bits(f,8);
- if (m->windowtype != 0) return stbv_error(f, VORBIS_invalid_setup);
- if (m->transformtype != 0) return stbv_error(f, VORBIS_invalid_setup);
- if (m->mapping >= f->mapping_count) return stbv_error(f, VORBIS_invalid_setup);
- }
-
- stbv_flush_packet(f);
-
- f->previous_length = 0;
-
- for (i=0; i < f->channels; ++i) {
- f->channel_buffers[i] = (float *) stbv_setup_malloc(f, sizeof(float) * f->blocksize_1);
- f->previous_window[i] = (float *) stbv_setup_malloc(f, sizeof(float) * f->blocksize_1/2);
- f->finalY[i] = (stbv_int16 *) stbv_setup_malloc(f, sizeof(stbv_int16) * longest_floorlist);
- if (f->channel_buffers[i] == NULL || f->previous_window[i] == NULL || f->finalY[i] == NULL) return stbv_error(f, VORBIS_outofmem);
- memset(f->channel_buffers[i], 0, sizeof(float) * f->blocksize_1);
- #ifdef STB_VORBIS_NO_DEFER_FLOOR
- f->floor_buffers[i] = (float *) stbv_setup_malloc(f, sizeof(float) * f->blocksize_1/2);
- if (f->floor_buffers[i] == NULL) return stbv_error(f, VORBIS_outofmem);
- #endif
- }
-
- if (!stbv_init_blocksize(f, 0, f->blocksize_0)) return FALSE;
- if (!stbv_init_blocksize(f, 1, f->blocksize_1)) return FALSE;
- f->blocksize[0] = f->blocksize_0;
- f->blocksize[1] = f->blocksize_1;
-
-#ifdef STB_VORBIS_DIVIDE_TABLE
- if (stbv_integer_divide_table[1][1]==0)
- for (i=0; i < STBV_DIVTAB_NUMER; ++i)
- for (j=1; j < STBV_DIVTAB_DENOM; ++j)
- stbv_integer_divide_table[i][j] = i / j;
-#endif
-
- // compute how much temporary memory is needed
-
- // 1.
- {
- stbv_uint32 imdct_mem = (f->blocksize_1 * sizeof(float) >> 1);
- stbv_uint32 classify_mem;
- int i,max_part_read=0;
- for (i=0; i < f->residue_count; ++i) {
- StbvResidue *r = f->residue_config + i;
- unsigned int actual_size = f->blocksize_1 / 2;
- unsigned int limit_r_begin = r->begin < actual_size ? r->begin : actual_size;
- unsigned int limit_r_end = r->end < actual_size ? r->end : actual_size;
- int n_read = limit_r_end - limit_r_begin;
- int part_read = n_read / r->part_size;
- if (part_read > max_part_read)
- max_part_read = part_read;
- }
- #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
- classify_mem = f->channels * (sizeof(void*) + max_part_read * sizeof(stbv_uint8 *));
- #else
- classify_mem = f->channels * (sizeof(void*) + max_part_read * sizeof(int *));
- #endif
-
- // maximum reasonable partition size is f->blocksize_1
-
- f->temp_memory_required = classify_mem;
- if (imdct_mem > f->temp_memory_required)
- f->temp_memory_required = imdct_mem;
- }
-
- f->first_decode = TRUE;
-
- if (f->alloc.alloc_buffer) {
- assert(f->temp_offset == f->alloc.alloc_buffer_length_in_bytes);
- // check if there's enough temp memory so we don't error later
- if (f->setup_offset + sizeof(*f) + f->temp_memory_required > (unsigned) f->temp_offset)
- return stbv_error(f, VORBIS_outofmem);
- }
-
- f->first_audio_page_offset = stb_vorbis_get_file_offset(f);
-
- return TRUE;
-}
-
-static void stbv_vorbis_deinit(stb_vorbis *p)
-{
- int i,j;
- if (p->residue_config) {
- for (i=0; i < p->residue_count; ++i) {
- StbvResidue *r = p->residue_config+i;
- if (r->classdata) {
- for (j=0; j < p->codebooks[r->classbook].entries; ++j)
- stbv_setup_free(p, r->classdata[j]);
- stbv_setup_free(p, r->classdata);
- }
- stbv_setup_free(p, r->residue_books);
- }
- }
-
- if (p->codebooks) {
- STBV_CHECK(p);
- for (i=0; i < p->codebook_count; ++i) {
- StbvCodebook *c = p->codebooks + i;
- stbv_setup_free(p, c->codeword_lengths);
- stbv_setup_free(p, c->multiplicands);
- stbv_setup_free(p, c->codewords);
- stbv_setup_free(p, c->sorted_codewords);
- // c->sorted_values[-1] is the first entry in the array
- stbv_setup_free(p, c->sorted_values ? c->sorted_values-1 : NULL);
- }
- stbv_setup_free(p, p->codebooks);
- }
- stbv_setup_free(p, p->floor_config);
- stbv_setup_free(p, p->residue_config);
- if (p->mapping) {
- for (i=0; i < p->mapping_count; ++i)
- stbv_setup_free(p, p->mapping[i].chan);
- stbv_setup_free(p, p->mapping);
- }
- STBV_CHECK(p);
- for (i=0; i < p->channels && i < STB_VORBIS_MAX_CHANNELS; ++i) {
- stbv_setup_free(p, p->channel_buffers[i]);
- stbv_setup_free(p, p->previous_window[i]);
- #ifdef STB_VORBIS_NO_DEFER_FLOOR
- stbv_setup_free(p, p->floor_buffers[i]);
- #endif
- stbv_setup_free(p, p->finalY[i]);
- }
- for (i=0; i < 2; ++i) {
- stbv_setup_free(p, p->A[i]);
- stbv_setup_free(p, p->B[i]);
- stbv_setup_free(p, p->C[i]);
- stbv_setup_free(p, p->window[i]);
- stbv_setup_free(p, p->stbv_bit_reverse[i]);
- }
- #ifndef STB_VORBIS_NO_STDIO
- if (p->close_on_free) fclose(p->f);
- #endif
-}
-
-STBVDEF void stb_vorbis_close(stb_vorbis *p)
-{
- if (p == NULL) return;
- stbv_vorbis_deinit(p);
- stbv_setup_free(p,p);
-}
-
-static void stbv_vorbis_init(stb_vorbis *p, const stb_vorbis_alloc *z)
-{
- memset(p, 0, sizeof(*p)); // NULL out all malloc'd pointers to start
- if (z) {
- p->alloc = *z;
- p->alloc.alloc_buffer_length_in_bytes = (p->alloc.alloc_buffer_length_in_bytes+3) & ~3;
- p->temp_offset = p->alloc.alloc_buffer_length_in_bytes;
- }
- p->eof = 0;
- p->error = VORBIS__no_error;
- p->stream = NULL;
- p->codebooks = NULL;
- p->page_crc_tests = -1;
- #ifndef STB_VORBIS_NO_STDIO
- p->close_on_free = FALSE;
- p->f = NULL;
- #endif
-}
-
-STBVDEF int stb_vorbis_get_sample_offset(stb_vorbis *f)
-{
- if (f->current_loc_valid)
- return f->current_loc;
- else
- return -1;
-}
-
-STBVDEF stb_vorbis_info stb_vorbis_get_info(stb_vorbis *f)
-{
- stb_vorbis_info d;
- d.channels = f->channels;
- d.sample_rate = f->sample_rate;
- d.setup_memory_required = f->setup_memory_required;
- d.setup_temp_memory_required = f->setup_temp_memory_required;
- d.temp_memory_required = f->temp_memory_required;
- d.max_frame_size = f->blocksize_1 >> 1;
- return d;
-}
-
-STBVDEF int stb_vorbis_get_error(stb_vorbis *f)
-{
- int e = f->error;
- f->error = VORBIS__no_error;
- return e;
-}
-
-static stb_vorbis * stbv_vorbis_alloc(stb_vorbis *f)
-{
- stb_vorbis *p = (stb_vorbis *) stbv_setup_malloc(f, sizeof(*p));
- return p;
-}
-
-#ifndef STB_VORBIS_NO_PUSHDATA_API
-
-STBVDEF void stb_vorbis_flush_pushdata(stb_vorbis *f)
-{
- f->previous_length = 0;
- f->page_crc_tests = 0;
- f->discard_samples_deferred = 0;
- f->current_loc_valid = FALSE;
- f->first_decode = FALSE;
- f->samples_output = 0;
- f->channel_buffer_start = 0;
- f->channel_buffer_end = 0;
-}
-
-static int stbv_vorbis_search_for_page_pushdata(stbv_vorb *f, stbv_uint8 *data, int data_len)
-{
- int i,n;
- for (i=0; i < f->page_crc_tests; ++i)
- f->scan[i].bytes_done = 0;
-
- // if we have room for more scans, search for them first, because
- // they may cause us to stop early if their header is incomplete
- if (f->page_crc_tests < STB_VORBIS_PUSHDATA_CRC_COUNT) {
- if (data_len < 4) return 0;
- data_len -= 3; // need to look for 4-byte sequence, so don't miss
- // one that straddles a boundary
- for (i=0; i < data_len; ++i) {
- if (data[i] == 0x4f) {
- if (0==memcmp(data+i, stbv_ogg_page_header, 4)) {
- int j,len;
- stbv_uint32 crc;
- // make sure we have the whole page header
- if (i+26 >= data_len || i+27+data[i+26] >= data_len) {
- // only read up to this page start, so hopefully we'll
- // have the whole page header start next time
- data_len = i;
- break;
- }
- // ok, we have it all; compute the length of the page
- len = 27 + data[i+26];
- for (j=0; j < data[i+26]; ++j)
- len += data[i+27+j];
- // scan everything up to the embedded crc (which we must 0)
- crc = 0;
- for (j=0; j < 22; ++j)
- crc = stbv_crc32_update(crc, data[i+j]);
- // now process 4 0-bytes
- for ( ; j < 26; ++j)
- crc = stbv_crc32_update(crc, 0);
- // len is the total number of bytes we need to scan
- n = f->page_crc_tests++;
- f->scan[n].bytes_left = len-j;
- f->scan[n].crc_so_far = crc;
- f->scan[n].goal_crc = data[i+22] + (data[i+23] << 8) + (data[i+24]<<16) + (data[i+25]<<24);
- // if the last frame on a page is continued to the next, then
- // we can't recover the sample_loc immediately
- if (data[i+27+data[i+26]-1] == 255)
- f->scan[n].sample_loc = ~0;
- else
- f->scan[n].sample_loc = data[i+6] + (data[i+7] << 8) + (data[i+ 8]<<16) + (data[i+ 9]<<24);
- f->scan[n].bytes_done = i+j;
- if (f->page_crc_tests == STB_VORBIS_PUSHDATA_CRC_COUNT)
- break;
- // keep going if we still have room for more
- }
- }
- }
- }
-
- for (i=0; i < f->page_crc_tests;) {
- stbv_uint32 crc;
- int j;
- int n = f->scan[i].bytes_done;
- int m = f->scan[i].bytes_left;
- if (m > data_len - n) m = data_len - n;
- // m is the bytes to scan in the current chunk
- crc = f->scan[i].crc_so_far;
- for (j=0; j < m; ++j)
- crc = stbv_crc32_update(crc, data[n+j]);
- f->scan[i].bytes_left -= m;
- f->scan[i].crc_so_far = crc;
- if (f->scan[i].bytes_left == 0) {
- // does it match?
- if (f->scan[i].crc_so_far == f->scan[i].goal_crc) {
- // Houston, we have page
- data_len = n+m; // consumption amount is wherever that scan ended
- f->page_crc_tests = -1; // drop out of page scan mode
- f->previous_length = 0; // decode-but-don't-output one frame
- f->next_seg = -1; // start a new page
- f->current_loc = f->scan[i].sample_loc; // set the current sample location
- // to the amount we'd have decoded had we decoded this page
- f->current_loc_valid = f->current_loc != ~0U;
- return data_len;
- }
- // delete entry
- f->scan[i] = f->scan[--f->page_crc_tests];
- } else {
- ++i;
- }
- }
-
- return data_len;
-}
-
-// return value: number of bytes we used
-STBVDEF int stb_vorbis_decode_frame_pushdata(
- stb_vorbis *f, // the file we're decoding
- const stbv_uint8 *data, int data_len, // the memory available for decoding
- int *channels, // place to write number of float * buffers
- float ***output, // place to write float ** array of float * buffers
- int *samples // place to write number of output samples
- )
-{
- int i;
- int len,right,left;
-
- if (!STBV_IS_PUSH_MODE(f)) return stbv_error(f, VORBIS_invalid_api_mixing);
-
- if (f->page_crc_tests >= 0) {
- *samples = 0;
- return stbv_vorbis_search_for_page_pushdata(f, (stbv_uint8 *) data, data_len);
- }
-
- f->stream = (stbv_uint8 *) data;
- f->stream_end = (stbv_uint8 *) data + data_len;
- f->error = VORBIS__no_error;
-
- // check that we have the entire packet in memory
- if (!stbv_is_whole_packet_present(f, FALSE)) {
- *samples = 0;
- return 0;
- }
-
- if (!stbv_vorbis_decode_packet(f, &len, &left, &right)) {
- // save the actual error we encountered
- enum STBVorbisError error = f->error;
- if (error == VORBIS_bad_packet_type) {
- // flush and resynch
- f->error = VORBIS__no_error;
- while (stbv_get8_packet(f) != STBV_EOP)
- if (f->eof) break;
- *samples = 0;
- return (int) (f->stream - data);
- }
- if (error == VORBIS_continued_packet_flag_invalid) {
- if (f->previous_length == 0) {
- // we may be resynching, in which case it's ok to hit one
- // of these; just discard the packet
- f->error = VORBIS__no_error;
- while (stbv_get8_packet(f) != STBV_EOP)
- if (f->eof) break;
- *samples = 0;
- return (int) (f->stream - data);
- }
- }
- // if we get an error while parsing, what to do?
- // well, it DEFINITELY won't work to continue from where we are!
- stb_vorbis_flush_pushdata(f);
- // restore the error that actually made us bail
- f->error = error;
- *samples = 0;
- return 1;
- }
-
- // success!
- len = stbv_vorbis_finish_frame(f, len, left, right);
- for (i=0; i < f->channels; ++i)
- f->outputs[i] = f->channel_buffers[i] + left;
-
- if (channels) *channels = f->channels;
- *samples = len;
- *output = f->outputs;
- return (int) (f->stream - data);
-}
-
-STBVDEF stb_vorbis *stb_vorbis_open_pushdata(
- const unsigned char *data, int data_len, // the memory available for decoding
- int *data_used, // only defined if result is not NULL
- int *error, const stb_vorbis_alloc *alloc)
-{
- stb_vorbis *f, p;
- stbv_vorbis_init(&p, alloc);
- p.stream = (stbv_uint8 *) data;
- p.stream_end = (stbv_uint8 *) data + data_len;
- p.push_mode = TRUE;
- if (!stbv_start_decoder(&p)) {
- if (p.eof)
- *error = VORBIS_need_more_data;
- else
- *error = p.error;
- return NULL;
- }
- f = stbv_vorbis_alloc(&p);
- if (f) {
- *f = p;
- *data_used = (int) (f->stream - data);
- *error = 0;
- return f;
- } else {
- stbv_vorbis_deinit(&p);
- return NULL;
- }
-}
-#endif // STB_VORBIS_NO_PUSHDATA_API
-
-STBVDEF unsigned int stb_vorbis_get_file_offset(stb_vorbis *f)
-{
- #ifndef STB_VORBIS_NO_PUSHDATA_API
- if (f->push_mode) return 0;
- #endif
- if (STBV_USE_MEMORY(f)) return (unsigned int) (f->stream - f->stream_start);
- #ifndef STB_VORBIS_NO_STDIO
- return (unsigned int) (ftell(f->f) - f->f_start);
- #endif
-}
-
-#ifndef STB_VORBIS_NO_PULLDATA_API
-//
-// DATA-PULLING API
-//
-
-static stbv_uint32 stbv_vorbis_find_page(stb_vorbis *f, stbv_uint32 *end, stbv_uint32 *last)
-{
- for(;;) {
- int n;
- if (f->eof) return 0;
- n = stbv_get8(f);
- if (n == 0x4f) { // page header candidate
- unsigned int retry_loc = stb_vorbis_get_file_offset(f);
- int i;
- // check if we're off the end of a file_section stream
- if (retry_loc - 25 > f->stream_len)
- return 0;
- // check the rest of the header
- for (i=1; i < 4; ++i)
- if (stbv_get8(f) != stbv_ogg_page_header[i])
- break;
- if (f->eof) return 0;
- if (i == 4) {
- stbv_uint8 header[27];
- stbv_uint32 i, crc, goal, len;
- for (i=0; i < 4; ++i)
- header[i] = stbv_ogg_page_header[i];
- for (; i < 27; ++i)
- header[i] = stbv_get8(f);
- if (f->eof) return 0;
- if (header[4] != 0) goto invalid;
- goal = header[22] + (header[23] << 8) + (header[24]<<16) + (header[25]<<24);
- for (i=22; i < 26; ++i)
- header[i] = 0;
- crc = 0;
- for (i=0; i < 27; ++i)
- crc = stbv_crc32_update(crc, header[i]);
- len = 0;
- for (i=0; i < header[26]; ++i) {
- int s = stbv_get8(f);
- crc = stbv_crc32_update(crc, s);
- len += s;
- }
- if (len && f->eof) return 0;
- for (i=0; i < len; ++i)
- crc = stbv_crc32_update(crc, stbv_get8(f));
- // finished parsing probable page
- if (crc == goal) {
- // we could now check that it's either got the last
- // page flag set, OR it's followed by the capture
- // pattern, but I guess TECHNICALLY you could have
- // a file with garbage between each ogg page and recover
- // from it automatically? So even though that paranoia
- // might decrease the chance of an invalid decode by
- // another 2^32, not worth it since it would hose those
- // invalid-but-useful files?
- if (end)
- *end = stb_vorbis_get_file_offset(f);
- if (last) {
- if (header[5] & 0x04)
- *last = 1;
- else
- *last = 0;
- }
- stbv_set_file_offset(f, retry_loc-1);
- return 1;
- }
- }
- invalid:
- // not a valid page, so rewind and look for next one
- stbv_set_file_offset(f, retry_loc);
- }
- }
-}
-
-
-#define STBV_SAMPLE_unknown 0xffffffff
-
-// seeking is implemented with a binary search, which narrows down the range to
-// 64K, before using a linear search (because finding the synchronization
-// pattern can be expensive, and the chance we'd find the end page again is
-// relatively high for small ranges)
-//
-// two initial interpolation-style probes are used at the start of the search
-// to try to bound either side of the binary search sensibly, while still
-// working in O(log n) time if they fail.
-
-static int stbv_get_seek_page_info(stb_vorbis *f, StbvProbedPage *z)
-{
- stbv_uint8 header[27], lacing[255];
- int i,len;
-
- // record where the page starts
- z->page_start = stb_vorbis_get_file_offset(f);
-
- // parse the header
- stbv_getn(f, header, 27);
- if (header[0] != 'O' || header[1] != 'g' || header[2] != 'g' || header[3] != 'S')
- return 0;
- stbv_getn(f, lacing, header[26]);
-
- // determine the length of the payload
- len = 0;
- for (i=0; i < header[26]; ++i)
- len += lacing[i];
-
- // this implies where the page ends
- z->page_end = z->page_start + 27 + header[26] + len;
-
- // read the last-decoded sample out of the data
- z->last_decoded_sample = header[6] + (header[7] << 8) + (header[8] << 16) + (header[9] << 24);
-
- // restore file state to where we were
- stbv_set_file_offset(f, z->page_start);
- return 1;
-}
-
-// rarely used function to seek back to the preceeding page while finding the
-// start of a packet
-static int stbv_go_to_page_before(stb_vorbis *f, unsigned int limit_offset)
-{
- unsigned int previous_safe, end;
-
- // now we want to seek back 64K from the limit
- if (limit_offset >= 65536 && limit_offset-65536 >= f->first_audio_page_offset)
- previous_safe = limit_offset - 65536;
- else
- previous_safe = f->first_audio_page_offset;
-
- stbv_set_file_offset(f, previous_safe);
-
- while (stbv_vorbis_find_page(f, &end, NULL)) {
- if (end >= limit_offset && stb_vorbis_get_file_offset(f) < limit_offset)
- return 1;
- stbv_set_file_offset(f, end);
- }
-
- return 0;
-}
-
-// implements the search logic for finding a page and starting decoding. if
-// the function succeeds, current_loc_valid will be true and current_loc will
-// be less than or equal to the provided sample number (the closer the
-// better).
-static int stbv_seek_to_sample_coarse(stb_vorbis *f, stbv_uint32 sample_number)
-{
- StbvProbedPage left, right, mid;
- int i, start_seg_with_known_loc, end_pos, page_start;
- stbv_uint32 delta, stream_length, padding;
- double offset, bytes_per_sample;
- int probe = 0;
-
- // find the last page and validate the target sample
- stream_length = stb_vorbis_stream_length_in_samples(f);
- if (stream_length == 0) return stbv_error(f, VORBIS_seek_without_length);
- if (sample_number > stream_length) return stbv_error(f, VORBIS_seek_invalid);
-
- // this is the maximum difference between the window-center (which is the
- // actual granule position value), and the right-start (which the spec
- // indicates should be the granule position (give or take one)).
- padding = ((f->blocksize_1 - f->blocksize_0) >> 2);
- if (sample_number < padding)
- sample_number = 0;
- else
- sample_number -= padding;
-
- left = f->p_first;
- while (left.last_decoded_sample == ~0U) {
- // (untested) the first page does not have a 'last_decoded_sample'
- stbv_set_file_offset(f, left.page_end);
- if (!stbv_get_seek_page_info(f, &left)) goto error;
- }
-
- right = f->p_last;
- assert(right.last_decoded_sample != ~0U);
-
- // starting from the start is handled differently
- if (sample_number <= left.last_decoded_sample) {
- if (stb_vorbis_seek_start(f))
- return 1;
- return 0;
- }
-
- while (left.page_end != right.page_start) {
- assert(left.page_end < right.page_start);
- // search range in bytes
- delta = right.page_start - left.page_end;
- if (delta <= 65536) {
- // there's only 64K left to search - handle it linearly
- stbv_set_file_offset(f, left.page_end);
- } else {
- if (probe < 2) {
- if (probe == 0) {
- // first probe (interpolate)
- double data_bytes = right.page_end - left.page_start;
- bytes_per_sample = data_bytes / right.last_decoded_sample;
- offset = left.page_start + bytes_per_sample * (sample_number - left.last_decoded_sample);
- } else {
- // second probe (try to bound the other side)
- double error = ((double) sample_number - mid.last_decoded_sample) * bytes_per_sample;
- if (error >= 0 && error < 8000) error = 8000;
- if (error < 0 && error > -8000) error = -8000;
- offset += error * 2;
- }
-
- // ensure the offset is valid
- if (offset < left.page_end)
- offset = left.page_end;
- if (offset > right.page_start - 65536)
- offset = right.page_start - 65536;
-
- stbv_set_file_offset(f, (unsigned int) offset);
- } else {
- // binary search for large ranges (offset by 32K to ensure
- // we don't hit the right page)
- stbv_set_file_offset(f, left.page_end + (delta / 2) - 32768);
- }
-
- if (!stbv_vorbis_find_page(f, NULL, NULL)) goto error;
- }
-
- for (;;) {
- if (!stbv_get_seek_page_info(f, &mid)) goto error;
- if (mid.last_decoded_sample != ~0U) break;
- // (untested) no frames end on this page
- stbv_set_file_offset(f, mid.page_end);
- assert(mid.page_start < right.page_start);
- }
-
- // if we've just found the last page again then we're in a tricky file,
- // and we're close enough.
- if (mid.page_start == right.page_start)
- break;
-
- if (sample_number < mid.last_decoded_sample)
- right = mid;
- else
- left = mid;
-
- ++probe;
- }
-
- // seek back to start of the last packet
- page_start = left.page_start;
- stbv_set_file_offset(f, page_start);
- if (!stbv_start_page(f)) return stbv_error(f, VORBIS_seek_failed);
- end_pos = f->end_seg_with_known_loc;
- assert(end_pos >= 0);
-
- for (;;) {
- for (i = end_pos; i > 0; --i)
- if (f->segments[i-1] != 255)
- break;
-
- start_seg_with_known_loc = i;
-
- if (start_seg_with_known_loc > 0 || !(f->page_flag & STBV_PAGEFLAG_continued_packet))
- break;
-
- // (untested) the final packet begins on an earlier page
- if (!stbv_go_to_page_before(f, page_start))
- goto error;
-
- page_start = stb_vorbis_get_file_offset(f);
- if (!stbv_start_page(f)) goto error;
- end_pos = f->segment_count - 1;
- }
-
- // prepare to start decoding
- f->current_loc_valid = FALSE;
- f->last_seg = FALSE;
- f->valid_bits = 0;
- f->packet_bytes = 0;
- f->bytes_in_seg = 0;
- f->previous_length = 0;
- f->next_seg = start_seg_with_known_loc;
-
- for (i = 0; i < start_seg_with_known_loc; i++)
- stbv_skip(f, f->segments[i]);
-
- // start decoding (optimizable - this frame is generally discarded)
- if (!stbv_vorbis_pump_first_frame(f))
- return 0;
- if (f->current_loc > sample_number)
- return stbv_error(f, VORBIS_seek_failed);
- return 1;
-
-error:
- // try to restore the file to a valid state
- stb_vorbis_seek_start(f);
- return stbv_error(f, VORBIS_seek_failed);
-}
-
-// the same as stbv_vorbis_decode_initial, but without advancing
-static int stbv_peek_decode_initial(stbv_vorb *f, int *p_left_start, int *p_left_end, int *p_right_start, int *p_right_end, int *mode)
-{
- int bits_read, bytes_read;
-
- if (!stbv_vorbis_decode_initial(f, p_left_start, p_left_end, p_right_start, p_right_end, mode))
- return 0;
-
- // either 1 or 2 bytes were read, figure out which so we can rewind
- bits_read = 1 + stbv_ilog(f->mode_count-1);
- if (f->mode_config[*mode].blockflag)
- bits_read += 2;
- bytes_read = (bits_read + 7) / 8;
-
- f->bytes_in_seg += bytes_read;
- f->packet_bytes -= bytes_read;
- stbv_skip(f, -bytes_read);
- if (f->next_seg == -1)
- f->next_seg = f->segment_count - 1;
- else
- f->next_seg--;
- f->valid_bits = 0;
-
- return 1;
-}
-
-STBVDEF int stb_vorbis_seek_frame(stb_vorbis *f, unsigned int sample_number)
-{
- stbv_uint32 max_frame_samples;
-
- if (STBV_IS_PUSH_MODE(f)) return stbv_error(f, VORBIS_invalid_api_mixing);
-
- // fast page-level search
- if (!stbv_seek_to_sample_coarse(f, sample_number))
- return 0;
-
- assert(f->current_loc_valid);
- assert(f->current_loc <= sample_number);
-
- // linear search for the relevant packet
- max_frame_samples = (f->blocksize_1*3 - f->blocksize_0) >> 2;
- while (f->current_loc < sample_number) {
- int left_start, left_end, right_start, right_end, mode, frame_samples;
- if (!stbv_peek_decode_initial(f, &left_start, &left_end, &right_start, &right_end, &mode))
- return stbv_error(f, VORBIS_seek_failed);
- // calculate the number of samples returned by the next frame
- frame_samples = right_start - left_start;
- if (f->current_loc + frame_samples > sample_number) {
- return 1; // the next frame will contain the sample
- } else if (f->current_loc + frame_samples + max_frame_samples > sample_number) {
- // there's a chance the frame after this could contain the sample
- stbv_vorbis_pump_first_frame(f);
- } else {
- // this frame is too early to be relevant
- f->current_loc += frame_samples;
- f->previous_length = 0;
- stbv_maybe_start_packet(f);
- stbv_flush_packet(f);
- }
- }
- // the next frame will start with the sample
- assert(f->current_loc == sample_number);
- return 1;
-}
-
-STBVDEF int stb_vorbis_seek(stb_vorbis *f, unsigned int sample_number)
-{
- if (!stb_vorbis_seek_frame(f, sample_number))
- return 0;
-
- if (sample_number != f->current_loc) {
- int n;
- stbv_uint32 frame_start = f->current_loc;
- stb_vorbis_get_frame_float(f, &n, NULL);
- assert(sample_number > frame_start);
- assert(f->channel_buffer_start + (int) (sample_number-frame_start) <= f->channel_buffer_end);
- f->channel_buffer_start += (sample_number - frame_start);
- }
-
- return 1;
-}
-
-STBVDEF int stb_vorbis_seek_start(stb_vorbis *f)
-{
- if (STBV_IS_PUSH_MODE(f)) { return stbv_error(f, VORBIS_invalid_api_mixing); }
- stbv_set_file_offset(f, f->first_audio_page_offset);
- f->previous_length = 0;
- f->first_decode = TRUE;
- f->next_seg = -1;
- return stbv_vorbis_pump_first_frame(f);
-}
-
-STBVDEF unsigned int stb_vorbis_stream_length_in_samples(stb_vorbis *f)
-{
- unsigned int restore_offset, previous_safe;
- unsigned int end, last_page_loc;
-
- if (STBV_IS_PUSH_MODE(f)) return stbv_error(f, VORBIS_invalid_api_mixing);
- if (!f->total_samples) {
- unsigned int last;
- stbv_uint32 lo,hi;
- char header[6];
-
- // first, store the current decode position so we can restore it
- restore_offset = stb_vorbis_get_file_offset(f);
-
- // now we want to seek back 64K from the end (the last page must
- // be at most a little less than 64K, but let's allow a little slop)
- if (f->stream_len >= 65536 && f->stream_len-65536 >= f->first_audio_page_offset)
- previous_safe = f->stream_len - 65536;
- else
- previous_safe = f->first_audio_page_offset;
-
- stbv_set_file_offset(f, previous_safe);
- // previous_safe is now our candidate 'earliest known place that seeking
- // to will lead to the final page'
-
- if (!stbv_vorbis_find_page(f, &end, &last)) {
- // if we can't find a page, we're hosed!
- f->error = VORBIS_cant_find_last_page;
- f->total_samples = 0xffffffff;
- goto done;
- }
-
- // check if there are more pages
- last_page_loc = stb_vorbis_get_file_offset(f);
-
- // stop when the last_page flag is set, not when we reach eof;
- // this allows us to stop short of a 'file_section' end without
- // explicitly checking the length of the section
- while (!last) {
- stbv_set_file_offset(f, end);
- if (!stbv_vorbis_find_page(f, &end, &last)) {
- // the last page we found didn't have the 'last page' flag
- // set. whoops!
- break;
- }
- previous_safe = last_page_loc+1;
- last_page_loc = stb_vorbis_get_file_offset(f);
- }
-
- stbv_set_file_offset(f, last_page_loc);
-
- // parse the header
- stbv_getn(f, (unsigned char *)header, 6);
- // extract the absolute granule position
- lo = stbv_get32(f);
- hi = stbv_get32(f);
- if (lo == 0xffffffff && hi == 0xffffffff) {
- f->error = VORBIS_cant_find_last_page;
- f->total_samples = STBV_SAMPLE_unknown;
- goto done;
- }
- if (hi)
- lo = 0xfffffffe; // saturate
- f->total_samples = lo;
-
- f->p_last.page_start = last_page_loc;
- f->p_last.page_end = end;
- f->p_last.last_decoded_sample = lo;
-
- done:
- stbv_set_file_offset(f, restore_offset);
- }
- return f->total_samples == STBV_SAMPLE_unknown ? 0 : f->total_samples;
-}
-
-STBVDEF float stb_vorbis_stream_length_in_seconds(stb_vorbis *f)
-{
- return stb_vorbis_stream_length_in_samples(f) / (float) f->sample_rate;
-}
-
-
-
-STBVDEF int stb_vorbis_get_frame_float(stb_vorbis *f, int *channels, float ***output)
-{
- int len, right,left,i;
- if (STBV_IS_PUSH_MODE(f)) return stbv_error(f, VORBIS_invalid_api_mixing);
-
- if (!stbv_vorbis_decode_packet(f, &len, &left, &right)) {
- f->channel_buffer_start = f->channel_buffer_end = 0;
- return 0;
- }
-
- len = stbv_vorbis_finish_frame(f, len, left, right);
- for (i=0; i < f->channels; ++i)
- f->outputs[i] = f->channel_buffers[i] + left;
-
- f->channel_buffer_start = left;
- f->channel_buffer_end = left+len;
-
- if (channels) *channels = f->channels;
- if (output) *output = f->outputs;
- return len;
-}
-
-#ifndef STB_VORBIS_NO_STDIO
-
-STBVDEF stb_vorbis * stb_vorbis_open_file_section(FILE *file, int close_on_free, int *error, const stb_vorbis_alloc *alloc, unsigned int length)
-{
- stb_vorbis *f, p;
- stbv_vorbis_init(&p, alloc);
- p.f = file;
- p.f_start = (stbv_uint32) ftell(file);
- p.stream_len = length;
- p.close_on_free = close_on_free;
- if (stbv_start_decoder(&p)) {
- f = stbv_vorbis_alloc(&p);
- if (f) {
- *f = p;
- stbv_vorbis_pump_first_frame(f);
- return f;
- }
- }
- if (error) *error = p.error;
- stbv_vorbis_deinit(&p);
- return NULL;
-}
-
-STBVDEF stb_vorbis * stb_vorbis_open_file(FILE *file, int close_on_free, int *error, const stb_vorbis_alloc *alloc)
-{
- unsigned int len, start;
- start = (unsigned int) ftell(file);
- fseek(file, 0, SEEK_END);
- len = (unsigned int) (ftell(file) - start);
- fseek(file, start, SEEK_SET);
- return stb_vorbis_open_file_section(file, close_on_free, error, alloc, len);
-}
-
-STBVDEF stb_vorbis * stb_vorbis_open_filename(const char *filename, int *error, const stb_vorbis_alloc *alloc)
-{
- FILE *f = fopen(filename, "rb");
- if (f)
- return stb_vorbis_open_file(f, TRUE, error, alloc);
- if (error) *error = VORBIS_file_open_failure;
- return NULL;
-}
-#endif // STB_VORBIS_NO_STDIO
-
-STBVDEF stb_vorbis * stb_vorbis_open_memory(const unsigned char *data, int len, int *error, const stb_vorbis_alloc *alloc)
-{
- stb_vorbis *f, p;
- if (data == NULL) return NULL;
- stbv_vorbis_init(&p, alloc);
- p.stream = (stbv_uint8 *) data;
- p.stream_end = (stbv_uint8 *) data + len;
- p.stream_start = (stbv_uint8 *) p.stream;
- p.stream_len = len;
- p.push_mode = FALSE;
- if (stbv_start_decoder(&p)) {
- f = stbv_vorbis_alloc(&p);
- if (f) {
- *f = p;
- stbv_vorbis_pump_first_frame(f);
- if (error) *error = VORBIS__no_error;
- return f;
- }
- }
- if (error) *error = p.error;
- stbv_vorbis_deinit(&p);
- return NULL;
-}
-
-#ifndef STB_VORBIS_NO_INTEGER_CONVERSION
-#define STBV_PLAYBACK_MONO 1
-#define STBV_PLAYBACK_LEFT 2
-#define STBV_PLAYBACK_RIGHT 4
-
-#define STBV_L (STBV_PLAYBACK_LEFT | STBV_PLAYBACK_MONO)
-#define STBV_C (STBV_PLAYBACK_LEFT | STBV_PLAYBACK_RIGHT | STBV_PLAYBACK_MONO)
-#define STBV_R (STBV_PLAYBACK_RIGHT | STBV_PLAYBACK_MONO)
-
-static stbv_int8 stbv_channel_position[7][6] =
-{
- { 0 },
- { STBV_C },
- { STBV_L, STBV_R },
- { STBV_L, STBV_C, STBV_R },
- { STBV_L, STBV_R, STBV_L, STBV_R },
- { STBV_L, STBV_C, STBV_R, STBV_L, STBV_R },
- { STBV_L, STBV_C, STBV_R, STBV_L, STBV_R, STBV_C },
-};
-
-
-#ifndef STB_VORBIS_NO_FAST_SCALED_FLOAT
- typedef union {
- float f;
- int i;
- } stbv_float_conv;
- typedef char stb_vorbis_float_size_test[sizeof(float)==4 && sizeof(int) == 4];
- #define STBV_FASTDEF(x) stbv_float_conv x
- // add (1<<23) to convert to int, then divide by 2^SHIFT, then add 0.5/2^SHIFT to round
- #define STBV_MAGIC(SHIFT) (1.5f * (1 << (23-SHIFT)) + 0.5f/(1 << SHIFT))
- #define STBV_ADDEND(SHIFT) (((150-SHIFT) << 23) + (1 << 22))
- #define STBV_FAST_SCALED_FLOAT_TO_INT(temp,x,s) (temp.f = (x) + STBV_MAGIC(s), temp.i - STBV_ADDEND(s))
- #define stbv_check_endianness()
-#else
- #define STBV_FAST_SCALED_FLOAT_TO_INT(temp,x,s) ((int) ((x) * (1 << (s))))
- #define stbv_check_endianness()
- #define STBV_FASTDEF(x)
-#endif
-
-static void stbv_copy_samples(short *dest, float *src, int len)
-{
- int i;
- stbv_check_endianness();
- for (i=0; i < len; ++i) {
- STBV_FASTDEF(temp);
- int v = STBV_FAST_SCALED_FLOAT_TO_INT(temp, src[i],15);
- if ((unsigned int) (v + 32768) > 65535)
- v = v < 0 ? -32768 : 32767;
- dest[i] = v;
- }
-}
-
-static void stbv_compute_samples(int mask, short *output, int num_c, float **data, int d_offset, int len)
-{
- #define BUFFER_SIZE 32
- float buffer[BUFFER_SIZE];
- int i,j,o,n = BUFFER_SIZE;
- stbv_check_endianness();
- for (o = 0; o < len; o += BUFFER_SIZE) {
- memset(buffer, 0, sizeof(buffer));
- if (o + n > len) n = len - o;
- for (j=0; j < num_c; ++j) {
- if (stbv_channel_position[num_c][j] & mask) {
- for (i=0; i < n; ++i)
- buffer[i] += data[j][d_offset+o+i];
- }
- }
- for (i=0; i < n; ++i) {
- STBV_FASTDEF(temp);
- int v = STBV_FAST_SCALED_FLOAT_TO_INT(temp,buffer[i],15);
- if ((unsigned int) (v + 32768) > 65535)
- v = v < 0 ? -32768 : 32767;
- output[o+i] = v;
- }
- }
-}
-
-static void stbv_compute_stereo_samples(short *output, int num_c, float **data, int d_offset, int len)
-{
- #define BUFFER_SIZE 32
- float buffer[BUFFER_SIZE];
- int i,j,o,n = BUFFER_SIZE >> 1;
- // o is the offset in the source data
- stbv_check_endianness();
- for (o = 0; o < len; o += BUFFER_SIZE >> 1) {
- // o2 is the offset in the output data
- int o2 = o << 1;
- memset(buffer, 0, sizeof(buffer));
- if (o + n > len) n = len - o;
- for (j=0; j < num_c; ++j) {
- int m = stbv_channel_position[num_c][j] & (STBV_PLAYBACK_LEFT | STBV_PLAYBACK_RIGHT);
- if (m == (STBV_PLAYBACK_LEFT | STBV_PLAYBACK_RIGHT)) {
- for (i=0; i < n; ++i) {
- buffer[i*2+0] += data[j][d_offset+o+i];
- buffer[i*2+1] += data[j][d_offset+o+i];
- }
- } else if (m == STBV_PLAYBACK_LEFT) {
- for (i=0; i < n; ++i) {
- buffer[i*2+0] += data[j][d_offset+o+i];
- }
- } else if (m == STBV_PLAYBACK_RIGHT) {
- for (i=0; i < n; ++i) {
- buffer[i*2+1] += data[j][d_offset+o+i];
- }
- }
- }
- for (i=0; i < (n<<1); ++i) {
- STBV_FASTDEF(temp);
- int v = STBV_FAST_SCALED_FLOAT_TO_INT(temp,buffer[i],15);
- if ((unsigned int) (v + 32768) > 65535)
- v = v < 0 ? -32768 : 32767;
- output[o2+i] = v;
- }
- }
-}
-
-static void stbv_convert_samples_short(int buf_c, short **buffer, int b_offset, int data_c, float **data, int d_offset, int samples)
-{
- int i;
- if (buf_c != data_c && buf_c <= 2 && data_c <= 6) {
- static int channel_selector[3][2] = { {0}, {STBV_PLAYBACK_MONO}, {STBV_PLAYBACK_LEFT, STBV_PLAYBACK_RIGHT} };
- for (i=0; i < buf_c; ++i)
- stbv_compute_samples(channel_selector[buf_c][i], buffer[i]+b_offset, data_c, data, d_offset, samples);
- } else {
- int limit = buf_c < data_c ? buf_c : data_c;
- for (i=0; i < limit; ++i)
- stbv_copy_samples(buffer[i]+b_offset, data[i]+d_offset, samples);
- for ( ; i < buf_c; ++i)
- memset(buffer[i]+b_offset, 0, sizeof(short) * samples);
- }
-}
-
-STBVDEF int stb_vorbis_get_frame_short(stb_vorbis *f, int num_c, short **buffer, int num_samples)
-{
- float **output;
- int len = stb_vorbis_get_frame_float(f, NULL, &output);
- if (len > num_samples) len = num_samples;
- if (len)
- stbv_convert_samples_short(num_c, buffer, 0, f->channels, output, 0, len);
- return len;
-}
-
-static void stbv_convert_channels_short_interleaved(int buf_c, short *buffer, int data_c, float **data, int d_offset, int len)
-{
- int i;
- stbv_check_endianness();
- if (buf_c != data_c && buf_c <= 2 && data_c <= 6) {
- assert(buf_c == 2);
- for (i=0; i < buf_c; ++i)
- stbv_compute_stereo_samples(buffer, data_c, data, d_offset, len);
- } else {
- int limit = buf_c < data_c ? buf_c : data_c;
- int j;
- for (j=0; j < len; ++j) {
- for (i=0; i < limit; ++i) {
- STBV_FASTDEF(temp);
- float f = data[i][d_offset+j];
- int v = STBV_FAST_SCALED_FLOAT_TO_INT(temp, f,15);//data[i][d_offset+j],15);
- if ((unsigned int) (v + 32768) > 65535)
- v = v < 0 ? -32768 : 32767;
- *buffer++ = v;
- }
- for ( ; i < buf_c; ++i)
- *buffer++ = 0;
- }
- }
-}
-
-STBVDEF int stb_vorbis_get_frame_short_interleaved(stb_vorbis *f, int num_c, short *buffer, int num_shorts)
-{
- float **output;
- int len;
- if (num_c == 1) return stb_vorbis_get_frame_short(f,num_c,&buffer, num_shorts);
- len = stb_vorbis_get_frame_float(f, NULL, &output);
- if (len) {
- if (len*num_c > num_shorts) len = num_shorts / num_c;
- stbv_convert_channels_short_interleaved(num_c, buffer, f->channels, output, 0, len);
- }
- return len;
-}
-
-STBVDEF int stb_vorbis_get_samples_short_interleaved(stb_vorbis *f, int channels, short *buffer, int num_shorts)
-{
- float **outputs;
- int len = num_shorts / channels;
- int n=0;
- int z = f->channels;
- if (z > channels) z = channels;
- while (n < len) {
- int k = f->channel_buffer_end - f->channel_buffer_start;
- if (n+k >= len) k = len - n;
- if (k)
- stbv_convert_channels_short_interleaved(channels, buffer, f->channels, f->channel_buffers, f->channel_buffer_start, k);
- buffer += k*channels;
- n += k;
- f->channel_buffer_start += k;
- if (n == len) break;
- if (!stb_vorbis_get_frame_float(f, NULL, &outputs)) break;
- }
- return n;
-}
-
-STBVDEF int stb_vorbis_get_samples_short(stb_vorbis *f, int channels, short **buffer, int len)
-{
- float **outputs;
- int n=0;
- int z = f->channels;
- if (z > channels) z = channels;
- while (n < len) {
- int k = f->channel_buffer_end - f->channel_buffer_start;
- if (n+k >= len) k = len - n;
- if (k)
- stbv_convert_samples_short(channels, buffer, n, f->channels, f->channel_buffers, f->channel_buffer_start, k);
- n += k;
- f->channel_buffer_start += k;
- if (n == len) break;
- if (!stb_vorbis_get_frame_float(f, NULL, &outputs)) break;
- }
- return n;
-}
-
-#ifndef STB_VORBIS_NO_STDIO
-STBVDEF int stb_vorbis_decode_filename(const char *filename, int *channels, int *sample_rate, short **output)
-{
- int data_len, offset, total, limit, error;
- short *data;
- stb_vorbis *v = stb_vorbis_open_filename(filename, &error, NULL);
- if (v == NULL) return -1;
- limit = v->channels * 4096;
- *channels = v->channels;
- if (sample_rate)
- *sample_rate = v->sample_rate;
- offset = data_len = 0;
- total = limit;
- data = (short *) malloc(total * sizeof(*data));
- if (data == NULL) {
- stb_vorbis_close(v);
- return -2;
- }
- for (;;) {
- int n = stb_vorbis_get_frame_short_interleaved(v, v->channels, data+offset, total-offset);
- if (n == 0) break;
- data_len += n;
- offset += n * v->channels;
- if (offset + limit > total) {
- short *data2;
- total *= 2;
- data2 = (short *) realloc(data, total * sizeof(*data));
- if (data2 == NULL) {
- free(data);
- stb_vorbis_close(v);
- return -2;
- }
- data = data2;
- }
- }
- *output = data;
- stb_vorbis_close(v);
- return data_len;
-}
-#endif // NO_STDIO
-
-STBVDEF int stb_vorbis_decode_memory(const stbv_uint8 *mem, int len, int *channels, int *sample_rate, short **output)
-{
- int data_len, offset, total, limit, error;
- short *data;
- stb_vorbis *v = stb_vorbis_open_memory(mem, len, &error, NULL);
- if (v == NULL) return -1;
- limit = v->channels * 4096;
- *channels = v->channels;
- if (sample_rate)
- *sample_rate = v->sample_rate;
- offset = data_len = 0;
- total = limit;
- data = (short *) malloc(total * sizeof(*data));
- if (data == NULL) {
- stb_vorbis_close(v);
- return -2;
- }
- for (;;) {
- int n = stb_vorbis_get_frame_short_interleaved(v, v->channels, data+offset, total-offset);
- if (n == 0) break;
- data_len += n;
- offset += n * v->channels;
- if (offset + limit > total) {
- short *data2;
- total *= 2;
- data2 = (short *) realloc(data, total * sizeof(*data));
- if (data2 == NULL) {
- free(data);
- stb_vorbis_close(v);
- return -2;
- }
- data = data2;
- }
- }
- *output = data;
- stb_vorbis_close(v);
- return data_len;
-}
-#endif // STB_VORBIS_NO_INTEGER_CONVERSION
-
-STBVDEF int stb_vorbis_get_samples_float_interleaved(stb_vorbis *f, int channels, float *buffer, int num_floats)
-{
- float **outputs;
- int len = num_floats / channels;
- int n=0;
- int z = f->channels;
- if (z > channels) z = channels;
- while (n < len) {
- int i,j;
- int k = f->channel_buffer_end - f->channel_buffer_start;
- if (n+k >= len) k = len - n;
- for (j=0; j < k; ++j) {
- for (i=0; i < z; ++i)
- *buffer++ = f->channel_buffers[i][f->channel_buffer_start+j];
- for ( ; i < channels; ++i)
- *buffer++ = 0;
- }
- n += k;
- f->channel_buffer_start += k;
- if (n == len)
- break;
- if (!stb_vorbis_get_frame_float(f, NULL, &outputs))
- break;
- }
- return n;
-}
-
-STBVDEF int stb_vorbis_get_samples_float(stb_vorbis *f, int channels, float **buffer, int num_samples)
-{
- float **outputs;
- int n=0;
- int z = f->channels;
- if (z > channels) z = channels;
- while (n < num_samples) {
- int i;
- int k = f->channel_buffer_end - f->channel_buffer_start;
- if (n+k >= num_samples) k = num_samples - n;
- if (k) {
- for (i=0; i < z; ++i)
- memcpy(buffer[i]+n, f->channel_buffers[i]+f->channel_buffer_start, sizeof(float)*k);
- for ( ; i < channels; ++i)
- memset(buffer[i]+n, 0, sizeof(float) * k);
- }
- n += k;
- f->channel_buffer_start += k;
- if (n == num_samples)
- break;
- if (!stb_vorbis_get_frame_float(f, NULL, &outputs))
- break;
- }
- return n;
-}
-#endif // STB_VORBIS_NO_PULLDATA_API
-
-/* Version history
- 1.12 - 2017-11-21 - limit residue begin/end to blocksize/2 to avoid large temp allocs in bad/corrupt files
- 1.11 - 2017-07-23 - fix MinGW compilation
- 1.10 - 2017-03-03 - more robust seeking; fix negative stbv_ilog(); clear error in open_memory
- 1.09 - 2016-04-04 - back out 'avoid discarding last frame' fix from previous version
- 1.08 - 2016-04-02 - fixed multiple warnings; fix setup memory leaks;
- avoid discarding last frame of audio data
- 1.07 - 2015-01-16 - fixed some warnings, fix mingw, const-correct API
- some more crash fixes when out of memory or with corrupt files
- 1.06 - 2015-08-31 - full, correct support for seeking API (Dougall Johnson)
- some crash fixes when out of memory or with corrupt files
- 1.05 - 2015-04-19 - don't define __forceinline if it's redundant
- 1.04 - 2014-08-27 - fix missing const-correct case in API
- 1.03 - 2014-08-07 - Warning fixes
- 1.02 - 2014-07-09 - Declare qsort compare function _cdecl on windows
- 1.01 - 2014-06-18 - fix stb_vorbis_get_samples_float
- 1.0 - 2014-05-26 - fix memory leaks; fix warnings; fix bugs in multichannel
- (API change) report sample rate for decode-full-file funcs
- 0.99996 - bracket #include <malloc.h> for macintosh compilation by Laurent Gomila
- 0.99995 - use union instead of pointer-cast for fast-float-to-int to avoid alias-optimization problem
- 0.99994 - change fast-float-to-int to work in single-precision FPU mode, remove endian-dependence
- 0.99993 - remove assert that fired on legal files with empty tables
- 0.99992 - rewind-to-start
- 0.99991 - bugfix to stb_vorbis_get_samples_short by Bernhard Wodo
- 0.9999 - (should have been 0.99990) fix no-CRT support, compiling as C++
- 0.9998 - add a full-decode function with a memory source
- 0.9997 - fix a bug in the read-from-FILE case in 0.9996 addition
- 0.9996 - query length of vorbis stream in samples/seconds
- 0.9995 - bugfix to another optimization that only happened in certain files
- 0.9994 - bugfix to one of the optimizations that caused significant (but inaudible?) errors
- 0.9993 - performance improvements; runs in 99% to 104% of time of reference implementation
- 0.9992 - performance improvement of IMDCT; now performs close to reference implementation
- 0.9991 - performance improvement of IMDCT
- 0.999 - (should have been 0.9990) performance improvement of IMDCT
- 0.998 - no-CRT support from Casey Muratori
- 0.997 - bugfixes for bugs found by Terje Mathisen
- 0.996 - bugfix: fast-huffman decode initialized incorrectly for sparse codebooks; fixing gives 10% speedup - found by Terje Mathisen
- 0.995 - bugfix: fix to 'effective' overrun detection - found by Terje Mathisen
- 0.994 - bugfix: garbage decode on final VQ symbol of a non-multiple - found by Terje Mathisen
- 0.993 - bugfix: pushdata API required 1 extra byte for empty page (failed to consume final page if empty) - found by Terje Mathisen
- 0.992 - fixes for MinGW warning
- 0.991 - turn fast-float-conversion on by default
- 0.990 - fix push-mode seek recovery if you seek into the headers
- 0.98b - fix to bad release of 0.98
- 0.98 - fix push-mode seek recovery; robustify float-to-int and support non-fast mode
- 0.97 - builds under c++ (typecasting, don't use 'class' keyword)
- 0.96 - somehow MY 0.95 was right, but the web one was wrong, so here's my 0.95 rereleased as 0.96, fixes a typo in the clamping code
- 0.95 - clamping code for 16-bit functions
- 0.94 - not publically released
- 0.93 - fixed all-zero-floor case (was decoding garbage)
- 0.92 - fixed a memory leak
- 0.91 - conditional compiles to omit parts of the API and the infrastructure to support them: STB_VORBIS_NO_PULLDATA_API, STB_VORBIS_NO_PUSHDATA_API, STB_VORBIS_NO_STDIO, STB_VORBIS_NO_INTEGER_CONVERSION
- 0.90 - first public release
-*/
-
-#endif // STB_VORBIS_IMPLEMENTATION
-
-
-/*
-------------------------------------------------------------------------------
-This software is available under 2 licenses -- choose whichever you prefer.
-------------------------------------------------------------------------------
-ALTERNATIVE A - MIT License
-Copyright (c) 2017 Sean Barrett
-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, subject to the following conditions:
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-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.
-------------------------------------------------------------------------------
-ALTERNATIVE B - 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.
-------------------------------------------------------------------------------
-*/
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