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webrtcsrc: the webrtcbin get-transceiver index is not mlineindex

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Instead search through the list of transceivers for the transceiver with the
relevant mlineindex property.

Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1829

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/2292>
This commit is contained in:
Matthew Waters 2025-06-13 13:08:48 +10:00 committed by GStreamer Marge Bot
parent 0fba9bd61e
commit 083496d3bf
1 changed files with 20 additions and 4 deletions
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24
net/webrtc/src/webrtcsrc/imp.rs
View file

@ -895,10 +895,26 @@ impl Session {
obj = element,
"Getting transceiver for {stream_id} and index {i} with caps: {caps:#?}"
);
let transceiver = webrtcbin.emit_by_name::<Option<gst_webrtc::WebRTCRTPTransceiver>>(
"get-transceiver",
&[&(i as i32)],
).unwrap_or_else(|| {
let mut transceiver = None;
let mut idx = 0i32;
// find the transceiver with this mline
loop {
let Some(to_check) = webrtcbin
.emit_by_name::<Option<gst_webrtc::WebRTCRTPTransceiver>>(
"get-transceiver",
&[&idx],
)
else {
break;
};
let mline = to_check.property::<u32>("mlineindex");
if mline as usize == i {
transceiver = Some(to_check);
break;
}
idx += 1;
}
let transceiver = transceiver.unwrap_or_else(|| {
gst::warning!(CAT, "Transceiver for idx {i} does not exist, GStreamer <= 1.24, adding it ourself");
webrtcbin.emit_by_name::<gst_webrtc::WebRTCRTPTransceiver>(
"add-transceiver",