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openvidu-browser: simulcast on Firefox

pull/648/head
Juan Navarro 2021-06-30 19:24:23 +02:00
parent 6d93fc3405
commit cf613aedfc
1 changed files with 25 additions and 3 deletions
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26
openvidu-browser/src/OpenViduInternal/WebRtcPeer/WebRtcPeer.ts
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@ -164,7 +164,7 @@ export class WebRtcPeer {
* Only if the negotiation was initiated by this peer
*/
createOffer(): Promise<RTCSessionDescriptionInit> {
return new Promise((resolve, reject) => {
return new Promise(async (resolve, reject) => {
// TODO: Delete this conditional when all supported browsers are
// modern enough to implement the Transceiver methods.
if ("addTransceiver" in this.pc) {
@ -190,7 +190,29 @@ export class WebRtcPeer {
if (this.configuration.simulcast && track.kind === "video") {
tcInit.sendEncodings = simulcastVideoEncodings;
}
this.pc.addTransceiver(track, tcInit);
const tc = this.pc.addTransceiver(track, tcInit);
// FIXME: Check that the simulcast encodings were applied.
// Firefox doesn't implement `RTCRtpTransceiverInit.sendEncodings`
// so the only way to enable simulcast is with `RTCRtpSender.setParameters()`.
//
// This next block can be deleted when Firefox fixes bug #1396918:
// https://bugzilla.mozilla.org/show_bug.cgi?id=1396918
//
// NOTE: This is done in a way that is compatible with all browsers, to save on
// browser-conditional code. The idea comes from WebRTC Adapter.js:
// * https://github.com/webrtcHacks/adapter/issues/998
// * https://github.com/webrtcHacks/adapter/blob/845a3b4874f1892a76f04c3cc520e80b5041c303/src/js/firefox/firefox_shim.js#L217
if (this.configuration.simulcast && track.kind === "video") {
const sendParams = tc.sender.getParameters();
if (
!("encodings" in sendParams) ||
sendParams.encodings.length !== tcInit.sendEncodings!.length
) {
sendParams.encodings = tcInit.sendEncodings!;
await tc.sender.setParameters(sendParams);
}
}
}
} else {
// To just receive media, create new recvonly transceivers.