[英]WebRTC ontrack on caller side not firing after answer received
在我的多對等 webrtc 客戶端(在 chrome 上測試)中,成功建立了穩定的連接,但是在我收到被叫方的答復后, ontrack事件沒有觸發,因此流 sourceObj 沒有附加到我的 DOM。 為什么? 被調用者顯示兩個視頻(本地和遠程),但在調用者端未添加遠程視頻,這似乎是由於ontrack 事件未觸發。
我在發送 Offer/Answer 之前創建了所有 RTCPeerConnection,並在將 ontrack 事件綁定到它之后在創建時將本地軌道添加到它。 然后我發送報價/答案並遵循信號處理過程。
class WebRTC_Client {
private serversCfg = {
iceServers: [{
urls: ["stun:stun.l.google.com:19302"]
}]
};
...
private gotStream(stream) {
window.localStream = stream;
...
}
private stopLocalTracks(){
if (window.localStream) {
window.localStream.getTracks().forEach(function (track) {
track.stop();
});
var videoTracks = window.localStream.getVideoTracks();
for (var i = 0; i !== videoTracks.length; ++i) {
videoTracks[i].stop();
}
}
}
private start() {
var self = this;
...
this.stopLocalTracks();
...
navigator.mediaDevices.getUserMedia(this.getConstrains())
.then((stream) => {
self.gotStream(stream);
trace('Send signal to peers that I am ready to be called: onReadyForTeamspeak');
self.SignalingChannel.send(JSON.stringify({type: 'onReadyForTeamspeak'}));
})
.catch( self.errorHandler );
}
public addPeerId(peerId){
this.availablePeerIds[peerId] = peerId;
this.preparePeerConnection(peerId);
}
private preparePeerConnection(peerId){
var self = this;
if( this.peerConns[peerId] ){
return;
}
this.peerConns[peerId] = new RTCPeerConnection(this.serversCfg);
this.peerConns[peerId].ontrack = function (evt) { self.gotRemoteStream(evt, peerId); };
this.peerConns[peerId].onicecandidate = function (evt) { self.iceCallback(evt, peerId); };
this.addTracks(peerId);
}
private addTracks(peerId){
var self = this;
var localTracksCount = 0;
window.localStream.getTracks().forEach(
function (track) {
self.peerConns[peerId].addTrack(
track,
window.localStream
);
}
);
}
private call() {
var self = this;
for( let peerId in this.availablePeerIds ){
if( !this.availablePeerIds.hasOwnProperty(peerId) ){
continue;
}
if( this.isCaller(peerId) ) {
this.preparePeerConnection(peerId);
this.createOffer(peerId);
}
}
}
private createOffer(peerId){
var self = this;
this.peerConns[peerId].createOffer( this.offerOptions )
.then( function (offer) { return self.peerConns[peerId].setLocalDescription(offer); } )
.then( function () {
self.SignalingChannel.send(JSON.stringify({ "sdp": self.peerConns[peerId].localDescription, "remotePeerId": peerId, "type": "onWebRTCPeerConn" }));
})
.catch( this.errorHandler );
}
private answerCall(peerId){
var self = this;
this.peerConns[peerId].createAnswer()
.then( function (answer) { return self.peerConns[peerId].setLocalDescription(answer); } )
.then( function () {
self.SignalingChannel.send(JSON.stringify({ "sdp": self.peerConns[peerId].localDescription, "remotePeerId": peerId, "type": "onWebRTCPeerConn" }));
})
.catch( this.errorHandler );
}
...
private gotRemoteStream(e, peerId) {
if (!this.videoBillboards[peerId]) {
this.createMediaElements(peerId);
}
if (this.videoAssets[peerId].srcObject !== e.streams[0]) {
this.videoAssets[peerId].srcObject = e.streams[0];
}
}
private iceCallback(event, peerId) {
this.SignalingChannel.send(JSON.stringify({ "candidate": event.candidate, "remotePeerId": peerId, "type": "onWebRTCPeerConn" }));
}
private handleCandidate(candidate, peerId) {
this.peerConns[peerId].addIceCandidate(candidate)
.then(
this.onAddIceCandidateSuccess,
this.onAddIceCandidateError
);
}
...
private handleSignals(signal){
var self = this,
peerId = signal.connectionId;
this.addPeerId(peerId);
if( signal.sdp ) {
var desc = new RTCSessionDescription(signal.sdp);
this.peerConns[peerId].setRemoteDescription(desc)
.then(function () {
if (desc.type === 'offer') {
self.answerCall(peerId);
}
})
.catch( this.errorHandler );
} else if( signal.candidate ){
this.handleCandidate(new RTCIceCandidate(signal.candidate), peerId);
} else if( signal.closeConn ){
this.endCall(peerId,true);
}
}
}
找到了解決方案! 我在this.peerConns[peerId].createOffer( this.offerOptions )
中輸入的選項有問題。
實際上在我提供的代碼中人們看不到它,但是動態創建我的類成員變量this.offerOptions
的方法有一個錯誤。 這顯然是在告訴被調用者不要將任何流發送回調用者。
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