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//! Symphonia integration for reading audio files.
use super::wave::*;
use std::fs::File;
use std::io::Cursor;
use std::path::Path;
extern crate alloc;
use alloc::boxed::Box;
use symphonia::core::audio::{AudioBuffer, Signal};
use symphonia::core::codecs::{CODEC_TYPE_NULL, DecoderOptions};
use symphonia::core::errors::{Error, Result};
use symphonia::core::formats::FormatOptions;
use symphonia::core::io::{MediaSource, MediaSourceStream};
use symphonia::core::meta::MetadataOptions;
use symphonia::core::probe::Hint;
pub type WaveResult<T> = Result<T>;
pub type WaveError = Error;
impl Wave {
/// Load first track of audio file from the given path.
/// Supported formats are anything that Symphonia can read.
pub fn load<P: AsRef<Path>>(path: P) -> WaveResult<Wave> {
Wave::load_track(path, None)
}
/// Load first track of audio from the given slice.
/// Supported formats are anything that Symphonia can read.
pub fn load_slice<S: AsRef<[u8]> + Send + Sync + 'static>(slice: S) -> WaveResult<Wave> {
Wave::load_slice_track(slice, None)
}
/// Load audio from the given slice. Track can be optionally selected.
/// If not selected, the first track with a known codec will be loaded.
/// Supported formats are anything that Symphonia can read.
pub fn load_slice_track<S: AsRef<[u8]> + Send + Sync + 'static>(
slice: S,
track: Option<usize>,
) -> WaveResult<Wave> {
let hint = Hint::new();
let source: Box<dyn MediaSource> = Box::new(Cursor::new(slice));
Wave::decode(source, track, hint)
}
/// Load audio file from the given path. Track can be optionally selected.
/// If not selected, the first track with a known codec will be loaded.
/// Supported formats are anything that Symphonia can read.
pub fn load_track<P: AsRef<Path>>(path: P, track: Option<usize>) -> WaveResult<Wave> {
let path = path.as_ref();
let mut hint = Hint::new();
if let Some(extension) = path.extension() {
if let Some(extension_str) = extension.to_str() {
hint.with_extension(extension_str);
}
}
let source: Box<dyn MediaSource> = match File::open(path) {
Ok(file) => Box::new(file),
Err(error) => return Err(Error::IoError(error)),
};
Wave::decode(source, track, hint)
}
/// Decode track from the given source.
fn decode(source: Box<dyn MediaSource>, track: Option<usize>, hint: Hint) -> WaveResult<Wave> {
let stream = MediaSourceStream::new(source, Default::default());
let format_opts = FormatOptions {
enable_gapless: false,
..Default::default()
};
let metadata_opts: MetadataOptions = Default::default();
let mut wave: Option<Wave> = None;
match symphonia::default::get_probe().format(&hint, stream, &format_opts, &metadata_opts) {
Ok(probed) => {
let mut reader = probed.format;
// Select track if specified, otherwise select the first track with a known codec.
let track = track.and_then(|t| reader.tracks().get(t)).or_else(|| {
reader
.tracks()
.iter()
.find(|t| t.codec_params.codec != CODEC_TYPE_NULL)
});
let track_id = match track {
Some(track) => track.id,
_ => return Err(Error::DecodeError("Could not find track.")),
};
let track = match reader.tracks().iter().find(|track| track.id == track_id) {
Some(track) => track,
_ => return Err(Error::DecodeError("Could not find track.")),
};
let decode_opts = DecoderOptions::default();
let mut decoder =
symphonia::default::get_codecs().make(&track.codec_params, &decode_opts)?;
loop {
let packet = match reader.next_packet() {
Ok(packet) => packet,
Err(err) => {
if let Some(wave_output) = wave {
return Ok(wave_output);
} else {
return Err(err);
}
}
};
// If the packet does not belong to the selected track, skip it.
if packet.track_id() != track_id {
continue;
}
match decoder.decode(&packet) {
Ok(decoded) => {
if wave.is_none() {
let spec = *decoded.spec();
wave = Some(Wave::new(spec.channels.count(), spec.rate as f64));
} else {
// TODO: Check that audio spec hasn't changed.
}
if let Some(ref mut wave_output) = wave {
let mut dest = AudioBuffer::<f32>::new(
decoded.capacity() as u64,
*decoded.spec(),
);
dest.render_silence(Some(decoded.frames()));
match &decoded {
symphonia::core::audio::AudioBufferRef::U8(reff) => {
reff.convert(&mut dest);
}
symphonia::core::audio::AudioBufferRef::U16(reff) => {
reff.convert(&mut dest);
}
symphonia::core::audio::AudioBufferRef::U24(reff) => {
reff.convert(&mut dest);
}
symphonia::core::audio::AudioBufferRef::U32(reff) => {
reff.convert(&mut dest);
}
symphonia::core::audio::AudioBufferRef::S8(reff) => {
reff.convert(&mut dest);
}
symphonia::core::audio::AudioBufferRef::S16(reff) => {
reff.convert(&mut dest);
}
symphonia::core::audio::AudioBufferRef::S24(reff) => {
reff.convert(&mut dest);
}
symphonia::core::audio::AudioBufferRef::S32(reff) => {
reff.convert(&mut dest);
}
symphonia::core::audio::AudioBufferRef::F32(reff) => {
reff.convert(&mut dest);
}
symphonia::core::audio::AudioBufferRef::F64(reff) => {
reff.convert(&mut dest);
}
}
let buffer_len = decoded.frames();
for channel in 0..dest.spec().channels.count() {
let x = dest.chan(channel);
if channel == 0 {
for _i in 0..buffer_len {
wave_output.push(0.0);
}
}
for i in 0..buffer_len {
wave_output.set(
channel,
wave_output.len() - buffer_len + i,
x[i],
);
}
}
}
}
Err(err) => return Err(err),
}
}
}
Err(err) => Err(err),
}
}
}