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rtpsend: ensure only a single rtcp pad push

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Otherwise, it can occur that multiple rtcp packets may be produced out
of order.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1426>
This commit is contained in:
Matthew Waters 2024-05-27 23:35:33 +10:00
parent 525179f666
commit df32e1ebfa
1 changed files with 31 additions and 20 deletions
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27
net/rtp/src/rtpbin2/rtpsend.rs
View file

@ -198,29 +198,40 @@ impl SendSession {
async fn rtcp_task(state: Arc<Mutex<State>>, session_id: usize) {
let mut stream = RtcpSendStream::new(state.clone(), session_id);
// we use a semaphore instead of mutex for ordering
// i.e. we should only allow a single pad push, but still allow other rtcp tasks to
// continue operating
let sem = Arc::new(tokio::sync::Semaphore::new(1));
while let Some(reply) = stream.next().await {
let send = {
let state = state.lock().unwrap();
let Some(session) = state.session_by_id(session_id) else {
continue;
};
match reply {
RtcpSendReply::Data(data) => {
let Some(rtcp_srcpad) = session.rtcp_send_srcpad.clone() else {
continue;
session.rtcp_send_srcpad.clone().map(|pad| (pad, data))
}
RtcpSendReply::SsrcBye(ssrc) => {
session
.internal_session
.config
.emit_by_name::<()>("bye-ssrc", &[&ssrc]);
None
}
}
};
drop(state);
if let Some((rtcp_srcpad, data)) = send {
let acquired = sem.clone().acquire_owned().await;
RUNTIME.spawn_blocking(move || {
let buffer = gst::Buffer::from_mut_slice(data);
if let Err(e) = rtcp_srcpad.push(buffer) {
gst::warning!(CAT, obj: rtcp_srcpad, "Failed to send rtcp data: flow return {e:?}");
}
drop(acquired);
});
}
RtcpSendReply::SsrcBye(ssrc) => session
.internal_session
.config
.emit_by_name::<()>("bye-ssrc", &[&ssrc]),
}
}
}