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webrtcsink: trigger negotiation manually

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We no longer connect to on-negotiation-needed, this in order to call the
consumer-added signal without holding the state lock:

Going to Ready triggers synchronous emission of the on-negotiation-needed
signal, during which time the application may add a data channel, causing
renegotiation, which we do not support at this time.

This is completely safe, as we know that at that point all conditions are
gathered: webrtcbin is in the Ready state, and all its transceivers have
codec_preferences.
This commit is contained in:
Mathieu Duponchelle 2022-03-01 02:27:34 +01:00
parent 3a5e05f2ab
commit 7f000ea42b
1 changed files with 18 additions and 22 deletions
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40
plugins/src/webrtcsink/imp.rs
View file

@ -1360,11 +1360,11 @@ impl WebRTCSink {
&self,
element: &super::WebRTCSink,
offer: gst_webrtc::WebRTCSessionDescription,
peer_id: String,
peer_id: &str,
) {
let mut state = self.state.lock().unwrap();
if let Some(consumer) = state.consumers.get(&peer_id) {
if let Some(consumer) = state.consumers.get(peer_id) {
consumer
.webrtcbin
.emit_by_name::<()>("set-local-description", &[&offer, &None::<gst::Promise>]);
@ -1382,19 +1382,15 @@ impl WebRTCSink {
}
}
fn on_negotiation_needed(&self, element: &super::WebRTCSink, peer_id: String) {
fn negotiate(&self, element: &super::WebRTCSink, peer_id: &str) {
let state = self.state.lock().unwrap();
gst_debug!(
CAT,
obj: element,
"On negotiation needed for peer {}",
peer_id
);
gst_debug!(CAT, obj: element, "Negotiating for peer {}", peer_id);
if let Some(consumer) = state.consumers.get(&peer_id) {
if let Some(consumer) = state.consumers.get(peer_id) {
let element = element.downgrade();
gst_debug!(CAT, "Creating offer for peer {}", peer_id);
let peer_id = peer_id.to_string();
let promise = gst::Promise::with_change_func(move |reply| {
gst_debug!(CAT, "Created offer for peer {}", peer_id);
@ -1429,7 +1425,7 @@ impl WebRTCSink {
.value("offer")
.map(|offer| offer.get::<gst_webrtc::WebRTCSessionDescription>().unwrap())
{
this.on_offer_created(&element, offer, peer_id);
this.on_offer_created(&element, offer, &peer_id);
} else {
gst_warning!(
CAT,
@ -1515,17 +1511,6 @@ impl WebRTCSink {
pipeline.add(&webrtcbin).unwrap();
let element_clone = element.downgrade();
let peer_id_clone = peer_id.to_owned();
webrtcbin.connect("on-negotiation-needed", false, move |_| {
if let Some(element) = element_clone.upgrade() {
let this = Self::from_instance(&element);
this.on_negotiation_needed(&element, peer_id_clone.to_string());
}
None
});
let element_clone = element.downgrade();
let peer_id_clone = peer_id.to_owned();
webrtcbin.connect("on-ice-candidate", false, move |values| {
@ -1737,6 +1722,17 @@ impl WebRTCSink {
// moment.
element.emit_by_name::<()>("consumer-added", &[&peer_id, &webrtcbin]);
// We don't connect to on-negotiation-needed, this in order to call the above
// signal without holding the state lock:
//
// Going to Ready triggers synchronous emission of the on-negotiation-needed
// signal, during which time the application may add a data channel, causing
// renegotiation, which we do not support at this time.
//
// This is completely safe, as we know that by now all conditions are gathered:
// webrtcbin is in the Ready state, and all its transceivers have codec_preferences.
self.negotiate(&element, peer_id);
pipeline.set_state(gst::State::Playing).map_err(|err| {
WebRTCSinkError::ConsumerPipelineError {
peer_id: peer_id.to_string(),