moq-mux 0.5.0

Media muxers and demuxers for MoQ
Documentation 
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use hang::catalog::Container;
use mp4_atom::{Decode, Encode};

fn run_fmp4(data: &[u8]) -> hang::Catalog {
	let mut broadcast = moq_net::Broadcast::new().produce();
	let catalog = crate::catalog::hang::Producer::new(&mut broadcast).unwrap();

	let mut fmp4 = crate::container::fmp4::Import::new(broadcast, catalog.clone());

	let mut buf = bytes::BytesMut::from(data);
	// Ignore errors from incomplete/malformed trailing fragments in test files.
	let _ = fmp4.decode(&mut buf);

	catalog.snapshot()
}

fn decode_init(init: &[u8]) -> (mp4_atom::Ftyp, mp4_atom::Moov) {
	let mut cursor = std::io::Cursor::new(init);
	let ftyp = mp4_atom::Ftyp::decode(&mut cursor).expect("invalid ftyp");
	let moov = mp4_atom::Moov::decode(&mut cursor).expect("invalid moov");
	(ftyp, moov)
}

#[test]
fn test_bbb_catalog() {
	let data = include_bytes!("test_data/bbb.mp4");
	let catalog = run_fmp4(data);

	assert_eq!(catalog.video.renditions.len(), 1);
	assert_eq!(catalog.audio.renditions.len(), 1);

	let video = catalog.video.renditions.values().next().unwrap();
	assert_eq!(video.codec.to_string(), "avc1.64001f");
	assert_eq!(video.coded_width, Some(1280));
	assert_eq!(video.coded_height, Some(720));
	assert!(matches!(video.container, Container::Cmaf { .. }));

	let audio = catalog.audio.renditions.values().next().unwrap();
	assert_eq!(audio.codec.to_string(), "mp4a.40.2");
	assert_eq!(audio.sample_rate, 44100);
	assert_eq!(audio.channel_count, 2);
	assert!(matches!(audio.container, Container::Cmaf { .. }));
}

#[test]
fn test_bbb_init_roundtrip() {
	let data = include_bytes!("test_data/bbb.mp4");
	let catalog = run_fmp4(data);

	let video = catalog.video.renditions.values().next().unwrap();
	let Container::Cmaf { init, .. } = &video.container else {
		panic!("expected Cmaf container");
	};
	let (ftyp, moov) = decode_init(init);
	assert_eq!(ftyp.major_brand, mp4_atom::FourCC::new(b"isom"));
	assert_eq!(moov.trak.len(), 1);
	assert_eq!(moov.trak[0].tkhd.track_id, 1);
	assert_eq!(moov.trak[0].mdia.mdhd.timescale, 24000);
	let mvex = moov.mvex.as_ref().unwrap();
	assert_eq!(mvex.trex.len(), 1);
	assert_eq!(mvex.trex[0].track_id, 1);

	// Verify it round-trips through encode/decode
	let mut buf = Vec::new();
	ftyp.encode(&mut buf).unwrap();
	moov.encode(&mut buf).unwrap();
	let (ftyp2, moov2) = decode_init(&buf);
	assert_eq!(ftyp2.major_brand, mp4_atom::FourCC::new(b"isom"));
	assert_eq!(moov2.trak.len(), 1);

	let audio = catalog.audio.renditions.values().next().unwrap();
	let Container::Cmaf { init, .. } = &audio.container else {
		panic!("expected Cmaf container");
	};
	let (ftyp, moov) = decode_init(init);
	assert_eq!(ftyp.major_brand, mp4_atom::FourCC::new(b"isom"));
	assert_eq!(moov.trak.len(), 1);
	assert_eq!(moov.trak[0].tkhd.track_id, 2);
	assert_eq!(moov.trak[0].mdia.mdhd.timescale, 44100);
	let mvex = moov.mvex.as_ref().unwrap();
	assert_eq!(mvex.trex.len(), 1);
	assert_eq!(mvex.trex[0].track_id, 2);
}

#[test]
fn test_av1_catalog() {
	let data = include_bytes!("test_data/av1.mp4");
	let catalog = run_fmp4(data);

	assert_eq!(catalog.video.renditions.len(), 1);
	assert_eq!(catalog.audio.renditions.len(), 0);

	let video = catalog.video.renditions.values().next().unwrap();
	assert!(video.codec.to_string().starts_with("av01."), "codec: {}", video.codec);
	assert!(matches!(video.container, Container::Cmaf { .. }));

	let Container::Cmaf { init, .. } = &video.container else {
		panic!("expected Cmaf container");
	};
	let (ftyp, moov) = decode_init(init);
	assert_eq!(ftyp.major_brand, mp4_atom::FourCC::new(b"isom"));
	assert_eq!(moov.trak.len(), 1);
	let mvex = moov.mvex.as_ref().unwrap();
	assert_eq!(mvex.trex.len(), 1);
	assert_eq!(mvex.trex[0].track_id, moov.trak[0].tkhd.track_id);
}

#[test]
fn test_vp9_catalog() {
	let data = include_bytes!("test_data/vp9.mp4");
	let catalog = run_fmp4(data);

	assert_eq!(catalog.video.renditions.len(), 1);
	assert_eq!(catalog.audio.renditions.len(), 0);

	let video = catalog.video.renditions.values().next().unwrap();
	assert!(video.codec.to_string().starts_with("vp09."), "codec: {}", video.codec);
	assert!(matches!(video.container, Container::Cmaf { .. }));

	let Container::Cmaf { init, .. } = &video.container else {
		panic!("expected Cmaf container");
	};
	let (ftyp, moov) = decode_init(init);
	assert_eq!(ftyp.major_brand, mp4_atom::FourCC::new(b"isom"));
	assert_eq!(moov.trak.len(), 1);
	let mvex = moov.mvex.as_ref().unwrap();
	assert_eq!(mvex.trex.len(), 1);
	assert_eq!(mvex.trex[0].track_id, moov.trak[0].tkhd.track_id);
}

/// E2E test: publish via the fMP4 importer, subscribe to the MSF catalog track,
/// and verify the resulting `hang::Catalog` matches what the hang catalog would
/// have produced.
///
/// `catalog::Producer` publishes both the hang (`catalog.json`) and MSF (`catalog`)
/// catalog tracks, so subscribing to the MSF one and decoding via `MsfConsumer`
/// exercises the full unified pipeline (hang -> MSF JSON on the wire -> hang).
#[tokio::test]
async fn test_msf_catalog_roundtrip() {
	let mut broadcast = moq_net::Broadcast::new().produce();
	// Take the consumer before adding tracks; subscribe_track is called after the
	// MSF catalog track has been created by `catalog::Producer::new`.
	let consumer = broadcast.consume();
	let catalog = crate::catalog::hang::Producer::new(&mut broadcast).unwrap();
	let mut fmp4 = crate::container::fmp4::Import::new(broadcast, catalog);

	let data = include_bytes!("test_data/bbb.mp4");
	let mut buf = bytes::BytesMut::from(&data[..]);
	// Trailing fragments may error out (e.g. partial mdat); ignore.
	let _ = fmp4.decode(&mut buf);

	let track = consumer
		.subscribe_track(&moq_net::Track::new(moq_msf::DEFAULT_NAME))
		.expect("MSF catalog track should exist");
	let mut msf = crate::catalog::msf::Consumer::new(track);

	let catalog = msf
		.next()
		.await
		.expect("MSF catalog should decode")
		.expect("MSF catalog should be present");

	// Same expectations as `test_bbb_catalog`, ensuring hang -> MSF -> hang preserves
	// codec, geometry, and CMAF init data.
	assert_eq!(catalog.video.renditions.len(), 1);
	assert_eq!(catalog.audio.renditions.len(), 1);

	let video = catalog.video.renditions.values().next().unwrap();
	assert_eq!(video.codec.to_string(), "avc1.64001f");
	assert_eq!(video.coded_width, Some(1280));
	assert_eq!(video.coded_height, Some(720));
	assert!(matches!(video.container, Container::Cmaf { .. }));

	let audio = catalog.audio.renditions.values().next().unwrap();
	assert_eq!(audio.codec.to_string(), "mp4a.40.2");
	assert_eq!(audio.sample_rate, 44100);
	assert_eq!(audio.channel_count, 2);
	assert!(matches!(audio.container, Container::Cmaf { .. }));
}