moq-mux 0.7.5

Media muxers and demuxers for MoQ
Documentation 
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

//! The original hang wire format.
//!
//! Each moq frame holds one media frame: a VarInt-encoded timestamp
//! followed by the raw codec bitstream. Simple but ad-hoc; new
//! broadcasts should use [`crate::container::loc`] instead.

use std::task::Poll;

use bytes::Buf;

use crate::container::{Container, Frame, Read};

/// Hang Legacy wire format. Stateless; one instance serves every track.
#[derive(Default)]
pub struct Wire;

impl Container for Wire {
	type Error = crate::Error;

	fn write(&self, group: &mut moq_net::GroupProducer, frames: &[Frame]) -> Result<(), Self::Error> {
		for frame in frames {
			let hang_frame = hang::container::Frame {
				timestamp: frame.timestamp,
				payload: frame.payload.clone(),
			};
			hang_frame.encode(group)?;
		}
		Ok(())
	}

	fn poll_read(&self, group: &mut moq_net::GroupConsumer, waiter: &kio::Waiter) -> Poll<Result<Read, Self::Error>> {
		use std::task::ready;

		loop {
			let Some(data) = ready!(group.poll_read_frame(waiter).map_err(hang::Error::from)?) else {
				return Poll::Ready(Ok(Read::Done));
			};

			let mut hang_frame = hang::container::Frame::decode(data)?;

			// An empty payload is a marker, not a sample: it says content stops at this
			// timestamp, so there's nothing to decode. Read on rather than hand an empty
			// access unit to a decoder. Skipping (rather than erroring) is what lets a
			// publisher start emitting markers without breaking us.
			if !hang_frame.payload.has_remaining() {
				continue;
			}

			let payload = hang_frame.payload.copy_to_bytes(hang_frame.payload.remaining());
			return Poll::Ready(Ok(Read::Frame(Frame {
				timestamp: hang_frame.timestamp,
				payload,
				// Legacy doesn't carry the keyframe bit on the wire; the
				// wrapping Consumer fills it in from group position.
				keyframe: false,
				// Legacy carries no per-frame duration.
				duration: None,
			})));
		}
	}
}