1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
use symphonia::core::audio::{AudioBufferRef, Signal};
use symphonia::core::codecs::{DecoderOptions, CODEC_TYPE_NULL};
use symphonia::core::conv::FromSample;
fn conv<T>(samples: &mut Vec<f32>, data: std::borrow::Cow<symphonia::core::audio::AudioBuffer<T>>)
where
T: symphonia::core::sample::Sample,
f32: symphonia::core::conv::FromSample<T>,
{
samples.extend(data.chan(0).iter().map(|v| f32::from_sample(*v)))
}
pub(crate) fn pcm_decode<P: AsRef<std::path::Path>>(path: P) -> anyhow::Result<(Vec<f32>, u32)> {
// Open the media source.
let src = std::fs::File::open(path)?;
// Create the media source stream.
let mss = symphonia::core::io::MediaSourceStream::new(Box::new(src), Default::default());
// Create a probe hint using the file's extension. [Optional]
let hint = symphonia::core::probe::Hint::new();
// Use the default options for metadata and format readers.
let meta_opts: symphonia::core::meta::MetadataOptions = Default::default();
let fmt_opts: symphonia::core::formats::FormatOptions = Default::default();
// Probe the media source.
let probed = symphonia::default::get_probe().format(&hint, mss, &fmt_opts, &meta_opts)?;
// Get the instantiated format reader.
let mut format = probed.format;
// Find the first audio track with a known (decodeable) codec.
let track = format
.tracks()
.iter()
.find(|t| t.codec_params.codec != CODEC_TYPE_NULL)
.expect("no supported audio tracks");
// Use the default options for the decoder.
let dec_opts: DecoderOptions = Default::default();
// Create a decoder for the track.
let mut decoder = symphonia::default::get_codecs()
.make(&track.codec_params, &dec_opts)
.expect("unsupported codec");
let track_id = track.id;
let sample_rate = track.codec_params.sample_rate.unwrap_or(0);
let mut pcm_data = Vec::new();
// The decode loop.
while let Ok(packet) = format.next_packet() {
// Consume any new metadata that has been read since the last packet.
while !format.metadata().is_latest() {
format.metadata().pop();
}
// If the packet does not belong to the selected track, skip over it.
if packet.track_id() != track_id {
continue;
}
match decoder.decode(&packet)? {
AudioBufferRef::F32(buf) => pcm_data.extend(buf.chan(0)),
AudioBufferRef::U8(data) => conv(&mut pcm_data, data),
AudioBufferRef::U16(data) => conv(&mut pcm_data, data),
AudioBufferRef::U24(data) => conv(&mut pcm_data, data),
AudioBufferRef::U32(data) => conv(&mut pcm_data, data),
AudioBufferRef::S8(data) => conv(&mut pcm_data, data),
AudioBufferRef::S16(data) => conv(&mut pcm_data, data),
AudioBufferRef::S24(data) => conv(&mut pcm_data, data),
AudioBufferRef::S32(data) => conv(&mut pcm_data, data),
AudioBufferRef::F64(data) => conv(&mut pcm_data, data),
}
}
Ok((pcm_data, sample_rate))
}
|
