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fix(webrtc): use MediaAdded event to discover video mid instead of hardcoded iteration (closes #11)

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dailz
2026-06-06 21:16:55 +08:00
parent fc4733ffe8
commit 1beaea8088
1 changed files with 28 additions and 19 deletions
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47
src/webrtc.rs
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@@ -311,28 +311,26 @@ impl WebRtcInner {
}
fn discover_video_params(&mut self) {
for s in ["0", "1", "2", "3"] {
let mid: Mid = s.into();
if let Some(media) = self.rtc.media(mid) {
if media.kind() == MediaKind::Video {
tracing::info!("Found video media: mid={mid}");
self.video_mid = Some(mid);
let mid = match self.video_mid {
Some(m) => m,
None => {
tracing::warn!("discover_video_params: no video_mid yet");
return;
}
};
self.video_pt = None;
if let Some(writer) = self.rtc.writer(mid) {
for pp in writer.payload_params() {
tracing::debug!("Codec: pt={:?} spec={:?}", pp.pt(), pp.spec());
if pp.spec().codec.is_video() && pp.spec().codec == Codec::H264 {
self.video_pt = Some(pp.pt());
tracing::info!("H.264 payload type: {:?}", pp.pt());
break;
}
}
}
if let Some(mid) = self.video_mid {
if let Some(writer) = self.rtc.writer(mid) {
for pp in writer.payload_params() {
tracing::debug!("Codec: pt={:?} spec={:?}", pp.pt(), pp.spec());
if pp.spec().codec.is_video() && pp.spec().codec == Codec::H264 {
self.video_pt = Some(pp.pt());
tracing::info!("H.264 payload type: {:?}", pp.pt());
break;
}
}
}
if self.video_pt.is_none() {
tracing::warn!("discover_video_params: no H.264 codec found for mid={mid}");
}
}
@@ -360,7 +358,18 @@ impl WebRtcInner {
return Ok(true);
}
Event::MediaAdded(ma) => {
tracing::info!("Media added: mid={:?}", ma.mid);
tracing::info!("Media added: mid={} kind={:?}", ma.mid, ma.kind);
if ma.kind == MediaKind::Video {
if let Some(media) = self.rtc.media(ma.mid) {
if media.direction().is_sending()
&& self.video_mid.is_none()
{
self.video_mid = Some(ma.mid);
tracing::info!("Captured video mid: {}", ma.mid);
self.discover_video_params();
}
}
}
}
_ => {
tracing::debug!("WebRTC event: {:?}", e);