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simulcast: change pc.addTrack -> pc.addTransceiver 

Use the addTransceiver API to pass a [sendEncodings], which enables
simulcast in the browser sender.
pull/573/head
Juan Navarro 2020-12-04 18:00:52 +01:00
parent 5e9511a376
commit 8de4b17e5f
1 changed files with 51 additions and 30 deletions
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81
openvidu-browser/src/OpenViduInternal/WebRtcPeer/WebRtcPeer.ts
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@ -29,6 +29,43 @@ const logger: OpenViduLogger = OpenViduLogger.getInstance();
*/
let platform: PlatformUtils;
// 3 spatial simulcast layers, with a different SSRC and RID for each layer.
// RTCRtpEncodingParameters[]
// https://w3c.github.io/webrtc-pc/#dom-rtcrtpencodingparameters
//
// NOTE: mediasoup assumes that encodings are ordered from lowest to highest
// quality.
// See: https://mediasoup.org/documentation/v3/mediasoup/rtp-parameters-and-capabilities/#Simulcast
const simulcastEncodings = [
{
rid: "r0",
maxBitrate: 700000,
scaleResolutionDownBy: 16.0,
// scaleResolutionDownBy: 4.0,
// mediasoup-client/Chrome74.ts:send()
// https://w3c.github.io/webrtc-svc/#scalabilitymodes*
// https://w3c.github.io/webrtc-svc/#dependencydiagrams*
// scalabilityMode: "L1T3",
},
{
rid: "r1",
maxBitrate: 800000,
scaleResolutionDownBy: 8.0,
// scaleResolutionDownBy: 2.0,
// mediasoup-client/Chrome74.ts:send()
// scalabilityMode: "L1T3",
},
{
rid: "r2",
maxBitrate: 900000,
scaleResolutionDownBy: 1.0,
// mediasoup-client/Chrome74.ts:send()
// scalabilityMode: "L1T3",
},
];
export interface WebRtcPeerConfiguration {
mediaConstraints: {
@ -100,7 +137,14 @@ export class WebRtcPeer {
}
if (!!this.configuration.mediaStream) {
for (const track of this.configuration.mediaStream.getTracks()) {
this.pc.addTrack(track, this.configuration.mediaStream);
const tcInit: any = {
direction: this.configuration.mode,
streams: [this.configuration.mediaStream],
};
if (track.kind === "video") {
tcInit.sendEncodings = simulcastEncodings;
}
const _tc = this.pc.addTransceiver(track, tcInit);
}
resolve();
}
@ -145,35 +189,12 @@ export class WebRtcPeer {
logger.debug('RTCPeerConnection constraints: ' + JSON.stringify(constraints));
if (platform.isSafariBrowser() && !platform.isIonicIos()) {
// Safari (excluding Ionic), at least on iOS just seems to support unified plan, whereas in other browsers is not yet ready and considered experimental
if (offerAudio) {
this.pc.addTransceiver('audio', {
direction: this.configuration.mode,
});
}
if (offerVideo) {
this.pc.addTransceiver('video', {
direction: this.configuration.mode,
});
}
this.pc.createOffer()
.then(offer => {
logger.debug('Created SDP offer');
resolve(offer);
})
.catch(error => reject(error));
} else {
// Rest of platforms
this.pc.createOffer(constraints)
.then(offer => {
logger.debug('Created SDP offer');
resolve(offer);
})
.catch(error => reject(error));
}
this.pc.createOffer(constraints)
.then(offer => {
logger.debug('Created SDP offer');
resolve(offer);
})
.catch(error => reject(error));
});
}