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Copy pathogg.rs
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287 lines (268 loc) · 11.2 KB
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//! Ogg audio source (`filmcraft-ogg` demux): Ogg Opus with our Opus decoder and Ogg Vorbis with the
//! bootstrap Vorbis decoder.
//!
//! Opus (RFC 7845): packet positions come from granule positions and TOC durations
//! ([`filmcraft_ogg::OpusTiming`]); the pre-skip samples land before 0 and are never returned, the
//! final page's end trimming is applied, and random access decodes [`crate::audio::OPUS_PRE_ROLL`]
//! of preceding packets first (so a seek gives the same samples as continuous playback).
//!
//! Vorbis: decoded once when opened (audio files are small next to video), aligned to the granule
//! positions (leading samples before the first page's granule and samples after the last page's
//! granule are dropped).
use std::collections::HashMap;
use std::sync::{Arc, Mutex};
use filmcraft_frame::{AudioBuffer, VideoFrame};
use filmcraft_media::{AudioStreamInfo, FrameRequest, MediaError, MediaInfo, MediaKind, MediaSource, SharedSource};
use filmcraft_ogg::{Codec, OggFile, OpusTiming};
use filmcraft_time::Tick;
use crate::CodecError;
use crate::audio::{OPUS_PRE_ROLL, OPUS_RATE, PacketDecoder, read_resampled};
impl filmcraft_ogg::ByteSource for crate::Src {
fn len(&self) -> u64 {
self.0.len()
}
fn read_at(&self, offset: u64, buf: &mut [u8]) -> std::io::Result<()> {
self.0.read_at(offset, buf)
}
}
pub fn sniff(head: &[u8]) -> bool {
filmcraft_ogg::sniff(head)
}
struct OpusState {
decoder: Option<PacketDecoder>,
packets: HashMap<usize, Arc<Vec<Vec<f32>>>>,
order: Vec<usize>,
last_decoded: Option<usize>,
}
enum Kind {
Opus {
head: Box<filmcraft_opus::OpusHead>,
timing: OpusTiming,
state: Mutex<OpusState>,
},
/// Fully decoded planar samples.
Pcm {
rate: u32,
samples: Vec<Vec<f32>>,
},
}
pub struct OggSource {
info: MediaInfo,
bytes: crate::Src,
file: OggFile,
stream: usize,
kind: Kind,
}
impl OggSource {
pub fn open(name: &str, bytes: Arc<[u8]>) -> crate::Result<Self> {
Self::open_reader(name, Arc::new(filmcraft_media::reader::MemReader(bytes)))
}
pub fn open_reader(name: &str, reader: filmcraft_media::SharedReader) -> crate::Result<Self> {
let bytes = crate::Src(reader);
let file = filmcraft_ogg::open(&bytes).map_err(|e| CodecError::Container(e.to_string()))?;
for w in &file.warnings {
log::warn!("{name}: {w}");
}
let stream = file
.streams
.iter()
.position(|s| matches!(s.codec, Codec::Opus | Codec::Vorbis) && !s.packets.is_empty())
.ok_or_else(|| CodecError::Unsupported("Ogg: no Opus or Vorbis stream".into()))?;
let st = &file.streams[stream];
let (kind, rate, channels, codec) = match st.codec {
Codec::Opus => {
let head = filmcraft_opus::OpusHead::parse(&st.headers[0]).map_err(|e| CodecError::Unsupported(format!("Opus: {e}")))?;
let timing = OpusTiming::of(st, head.pre_skip as u32);
let channels = head.channels as u32;
(
Kind::Opus {
head: Box::new(head),
timing,
state: Mutex::new(OpusState { decoder: None, packets: HashMap::new(), order: Vec::new(), last_decoded: None }),
},
OPUS_RATE,
channels,
"Opus",
)
}
_ => {
let (rate, samples) = decode_vorbis(&file, &bytes, stream)?;
let ch = samples.len() as u32;
(Kind::Pcm { rate, samples }, rate, ch, "Vorbis")
}
};
let frames = match &kind {
Kind::Opus { timing, .. } => timing.total,
Kind::Pcm { samples, .. } => samples.first().map_or(0, Vec::len) as i64,
};
let info = MediaInfo {
name: name.to_string(),
kind: MediaKind::AudioOnly,
duration: Tick::from_units(frames, rate as i64),
video: None,
audio: Some(AudioStreamInfo { sample_rate: rate, channels: channels.max(1), codec: codec.into(), bits_per_sample: None }),
container: "Ogg".into(),
start_timecode: None,
file_size: Some(bytes.0.len()),
};
Ok(Self { info, bytes, file, stream, kind })
}
/// The demuxed file.
pub fn file(&self) -> &OggFile {
&self.file
}
fn opus_packet(&self, st: &mut OpusState, head: &filmcraft_opus::OpusHead, timing: &OpusTiming, i: usize) -> crate::Result<Arc<Vec<Vec<f32>>>> {
if let Some(p) = st.packets.get(&i) {
return Ok(p.clone());
}
let read = |k: usize| self.file.read_packet(&self.bytes, self.stream, k).map_err(|e| CodecError::Container(e.to_string()));
if st.decoder.is_none() {
st.decoder = Some(PacketDecoder::opus(head.clone())?);
}
// Non-sequential access: reset and decode the pre-roll (RFC 7845 §4.6; see OPUS_PRE_ROLL).
if st.last_decoded.is_none_or(|l| l + 1 != i) {
let d = st.decoder.as_mut().ok_or_else(|| CodecError::Decode("no audio decoder".into()))?;
d.reset();
let from = timing.starts.partition_point(|&x| x <= timing.starts[i] - OPUS_PRE_ROLL as i64).saturating_sub(1);
for j in from..i {
if let Ok(prev) = read(j) {
let _ = d.decode(&prev, 0);
}
}
}
let data = read(i)?;
let r = st.decoder.as_mut().ok_or_else(|| CodecError::Decode("no audio decoder".into()))?.decode(&data, 0);
st.last_decoded = Some(i);
let p = Arc::new(r.unwrap_or_default());
st.packets.insert(i, p.clone());
st.order.push(i);
if st.order.len() > 2048 {
let old = st.order.remove(0);
st.packets.remove(&old);
}
Ok(p)
}
}
/// Decode a Vorbis stream fully, aligned to its granule positions.
fn decode_vorbis(file: &OggFile, bytes: &crate::Src, s: usize) -> crate::Result<(u32, Vec<Vec<f32>>)> {
use symphonia::core::codecs::CODEC_TYPE_VORBIS;
let st = &file.streams[s];
if st.headers.len() < 3 {
return Err(CodecError::Decode("Vorbis: missing header packets".into()));
}
let vi = filmcraft_ogg::VorbisInfo::parse(&st.headers[0]).ok_or_else(|| CodecError::Decode("Vorbis: bad identification header".into()))?;
let mut extra = st.headers[0].clone();
extra.extend_from_slice(&st.headers[2]);
let mut dec = PacketDecoder::new(CODEC_TYPE_VORBIS, vi.sample_rate, Some(extra))?;
let ch = vi.channels.max(1) as usize;
let mut out: Vec<Vec<f32>> = vec![Vec::new(); ch];
let mut lead: Option<i64> = None;
for (i, p) in st.packets.iter().enumerate() {
let data = file.read_packet(bytes, s, i).map_err(|e| CodecError::Container(e.to_string()))?;
if let Ok(pcm) = dec.decode(&data, 0) {
for (c, o) in out.iter_mut().enumerate() {
if let Some(src) = pcm.get(c) {
o.extend_from_slice(src);
}
}
}
if lead.is_none()
&& let Some(g) = p.granule
{
// samples decoded through the first granule page beyond its granule precede time 0
lead = Some((out[0].len() as i64 - g).max(0));
}
}
let lead = lead.unwrap_or(0) as usize;
for o in &mut out {
o.drain(..lead.min(o.len()));
}
if st.saw_eos
&& let Some(g) = st.last_granule
{
for o in &mut out {
o.truncate(g.max(0) as usize);
}
}
Ok((vi.sample_rate, out))
}
impl MediaSource for OggSource {
fn info(&self) -> &MediaInfo {
&self.info
}
fn video_frame(&self, _req: FrameRequest) -> Result<Arc<VideoFrame>, MediaError> {
Err(MediaError::NoStream("video"))
}
fn audio(&self, start: i64, frames: usize, sample_rate: u32) -> Result<AudioBuffer, MediaError> {
let (head, timing, state) = match &self.kind {
Kind::Pcm { rate, samples } => return Ok(read_resampled(samples, *rate, start, frames, sample_rate)),
Kind::Opus { head, timing, state } => (head, timing, state),
};
let ch = head.channels.max(1);
let ratio = OPUS_RATE as f64 / sample_rate as f64;
let exact = sample_rate == OPUS_R
74D5
ATE;
let s0 = if exact { start } else { (start as f64 * ratio).floor() as i64 };
let need = if exact { frames as i64 } else { (frames as f64 * ratio).ceil() as i64 + 2 };
let mut src: Vec<Vec<f32>> = vec![vec![0.0; need.max(0) as usize]; ch];
let mut st = state.lock().unwrap_or_else(|e| e.into_inner());
let n = timing.starts.len();
let mut i = timing.starts.partition_point(|&x| x <= s0.max(0)).saturating_sub(1);
while i < n {
let pk_start = timing.starts[i];
if pk_start >= s0 + need || pk_start >= timing.total {
break;
}
let pk = self.opus_packet(&mut st, head, timing, i)?;
for (c, dst) in src.iter_mut().enumerate() {
let Some(chan) = pk.get(c.min(pk.len().saturating_sub(1))) else { continue };
for (k, v) in chan.iter().enumerate() {
let pos = pk_start + k as i64;
// before 0: pre-skip; at or after total: end trimming
if pos < 0 || pos >= timing.total {
continue;
}
let at = pos - s0;
if at >= 0 && (at as usize) < dst.len() {
dst[at as usize] = *v;
}
}
}
i += 1;
}
drop(st);
let mut out = AudioBuffer::silence(sample_rate, ch, frames);
if exact {
out.channels = src;
return Ok(out);
}
let frac = s0 as f64 - start as f64 * ratio;
for k in 0..frames {
let pos = k as f64 * ratio - frac;
let i0 = pos.floor().max(0.0) as usize;
let f = (pos - i0 as f64) as f32;
for c in 0..ch {
let a = src[c].get(i0).copied().unwrap_or(0.0);
let b = src[c].get(i0 + 1).copied().unwrap_or(a);
out.channels[c][k] = a + (b - a) * f;
}
}
Ok(out)
}
}
/// Ogg Opus / Vorbis; other Ogg codecs (FLAC) fall through to the bootstrap audio opener.
fn handles(head: &[u8]) -> bool {
sniff(head) && (head.windows(8).any(|w| w == b"OpusHead") || head.windows(7).any(|w| w == b"\x01vorbis"))
}
pub fn opener(name: &str, bytes: Arc<[u8]>) -> Option<Result<SharedSource, MediaError>> {
if !handles(&bytes[..bytes.len().min(4096)]) {
return None;
}
Some(OggSource::open(name, bytes).map(|s| Arc::new(s) as SharedSource).map_err(Into::into))
}
/// [`filmcraft_media::ReaderOpener`] for Ogg Opus / Vorbis.
pub fn reader_opener(name: &str, head: &[u8], reader: &filmcraft_media::SharedReader) -> Option<Result<SharedSource, MediaError>> {
if !handles(&head[..head.len().min(4096)]) {
return None;
}
Some(OggSource::open_reader(name, reader.clone()).map(|s| Arc::new(s) as SharedSource).map_err(Into::into))
}