var WebRtcStreamer = (function() {
|
|
/**
|
* Interface with WebRTC-streamer API
|
* @constructor
|
* @param {string} videoElement - id of the video element tag
|
* @param {string} srvurl - url of webrtc-streamer (default is current location)
|
*/
|
var WebRtcStreamer = function WebRtcStreamer (videoElement, srvurl) {
|
if (typeof videoElement === "string") {
|
this.videoElement = document.getElementById(videoElement);
|
} else {
|
this.videoElement = videoElement;
|
}
|
this.srvurl = srvurl || location.protocol+"//"+window.location.hostname+":"+window.location.port;
|
this.pc = null;
|
|
this.mediaConstraints = { offerToReceiveAudio: true, offerToReceiveVideo: true };
|
|
this.iceServers = null;
|
this.earlyCandidates = [];
|
}
|
|
WebRtcStreamer.prototype._handleHttpErrors = function (response) {
|
if (!response.ok) {
|
throw Error(response.statusText);
|
}
|
return response;
|
}
|
|
/**
|
* Connect a WebRTC Stream to videoElement
|
* @param {string} videourl - id of WebRTC video stream
|
* @param {string} audiourl - id of WebRTC audio stream
|
* @param {string} options - options of WebRTC call
|
* @param {string} stream - local stream to send
|
*/
|
WebRtcStreamer.prototype.connect = function(videourl, audiourl, options, localstream) {
|
this.disconnect();
|
|
// getIceServers is not already received
|
if (!this.iceServers) {
|
console.log("Get IceServers");
|
|
fetch(this.srvurl + "/api/getIceServers")
|
.then(this._handleHttpErrors)
|
.then( (response) => (response.json()) )
|
.then( (response) => this.onReceiveGetIceServers.call(this,response, videourl, audiourl, options, localstream))
|
.catch( (error) => this.onError("getIceServers " + error ))
|
|
} else {
|
this.onReceiveGetIceServers(this.iceServers, videourl, audiourl, options, localstream);
|
}
|
}
|
|
/**
|
* Disconnect a WebRTC Stream and clear videoElement source
|
*/
|
WebRtcStreamer.prototype.disconnect = function() {
|
if (this.videoElement?.srcObject) {
|
this.videoElement.srcObject.getTracks().forEach(track => {
|
track.stop()
|
this.videoElement.srcObject.removeTrack(track);
|
});
|
}
|
if (this.pc) {
|
fetch(this.srvurl + "/api/hangup?peerid="+this.pc.peerid)
|
.then(this._handleHttpErrors)
|
.catch( (error) => this.onError("hangup " + error ))
|
|
|
try {
|
this.pc.close();
|
}
|
catch (e) {
|
console.log ("Failure close peer connection:" + e);
|
}
|
this.pc = null;
|
}
|
}
|
|
/*
|
* GetIceServers callback
|
*/
|
WebRtcStreamer.prototype.onReceiveGetIceServers = function(iceServers, videourl, audiourl, options, stream) {
|
this.iceServers = iceServers;
|
this.pcConfig = iceServers || {"iceServers": [] };
|
try {
|
this.createPeerConnection();
|
|
var callurl = this.srvurl + "/api/call?peerid="+ this.pc.peerid+"&url="+encodeURIComponent(videourl);
|
if (audiourl) {
|
callurl += "&audiourl="+encodeURIComponent(audiourl);
|
}
|
if (options) {
|
callurl += "&options="+encodeURIComponent(options);
|
}
|
|
if (stream) {
|
this.pc.addStream(stream);
|
}
|
|
// clear early candidates
|
this.earlyCandidates.length = 0;
|
|
// create Offer
|
var bind = this;
|
this.pc.createOffer(this.mediaConstraints).then(function(sessionDescription) {
|
console.log("Create offer:" + JSON.stringify(sessionDescription));
|
|
bind.pc.setLocalDescription(sessionDescription
|
, function() {
|
fetch(callurl, { method: "POST", body: JSON.stringify(sessionDescription) })
|
.then(bind._handleHttpErrors)
|
.then( (response) => (response.json()) )
|
.catch( (error) => bind.onError("call " + error ))
|
.then( (response) => bind.onReceiveCall.call(bind,response) )
|
.catch( (error) => bind.onError("call " + error ))
|
|
}
|
, function(error) {
|
console.log ("setLocalDescription error:" + JSON.stringify(error));
|
} );
|
|
}, function(error) {
|
alert("Create offer error:" + JSON.stringify(error));
|
});
|
|
} catch (e) {
|
this.disconnect();
|
alert("connect error: " + e);
|
}
|
}
|
|
|
WebRtcStreamer.prototype.getIceCandidate = function() {
|
fetch(this.srvurl + "/api/getIceCandidate?peerid=" + this.pc.peerid)
|
.then(this._handleHttpErrors)
|
.then( (response) => (response.json()) )
|
.then( (response) => this.onReceiveCandidate.call(this, response))
|
.catch( (error) => bind.onError("getIceCandidate " + error ))
|
}
|
|
/*
|
* create RTCPeerConnection
|
*/
|
WebRtcStreamer.prototype.createPeerConnection = function() {
|
console.log("createPeerConnection config: " + JSON.stringify(this.pcConfig));
|
this.pc = new RTCPeerConnection(this.pcConfig);
|
var pc = this.pc;
|
pc.peerid = Math.random();
|
|
var bind = this;
|
pc.onicecandidate = function(evt) { bind.onIceCandidate.call(bind, evt); };
|
pc.onaddstream = function(evt) { bind.onAddStream.call(bind,evt); };
|
pc.oniceconnectionstatechange = function(evt) {
|
console.log("oniceconnectionstatechange state: " + pc.iceConnectionState);
|
if (bind.videoElement) {
|
if (pc.iceConnectionState === "connected") {
|
bind.videoElement.style.opacity = "1.0";
|
}
|
else if (pc.iceConnectionState === "disconnected") {
|
bind.videoElement.style.opacity = "0.25";
|
}
|
else if ( (pc.iceConnectionState === "failed") || (pc.iceConnectionState === "closed") ) {
|
bind.videoElement.style.opacity = "0.5";
|
} else if (pc.iceConnectionState === "new") {
|
bind.getIceCandidate.call(bind)
|
}
|
}
|
}
|
pc.ondatachannel = function(evt) {
|
console.log("remote datachannel created:"+JSON.stringify(evt));
|
|
evt.channel.onopen = function () {
|
console.log("remote datachannel open");
|
this.send("remote channel openned");
|
}
|
evt.channel.onmessage = function (event) {
|
console.log("remote datachannel recv:"+JSON.stringify(event.data));
|
}
|
}
|
pc.onicegatheringstatechange = function() {
|
if (pc.iceGatheringState === "complete") {
|
const recvs = pc.getReceivers();
|
|
recvs.forEach((recv) => {
|
if (recv.track && recv.track.kind === "video") {
|
console.log("codecs:" + JSON.stringify(recv.getParameters().codecs))
|
}
|
});
|
}
|
}
|
|
try {
|
var dataChannel = pc.createDataChannel("ClientDataChannel");
|
dataChannel.onopen = function() {
|
console.log("local datachannel open");
|
this.send("local channel openned");
|
}
|
dataChannel.onmessage = function(evt) {
|
console.log("local datachannel recv:"+JSON.stringify(evt.data));
|
}
|
} catch (e) {
|
console.log("Cannor create datachannel error: " + e);
|
}
|
|
console.log("Created RTCPeerConnnection with config: " + JSON.stringify(this.pcConfig) );
|
return pc;
|
}
|
|
|
/*
|
* RTCPeerConnection IceCandidate callback
|
*/
|
WebRtcStreamer.prototype.onIceCandidate = function (event) {
|
if (event.candidate) {
|
if (this.pc.currentRemoteDescription) {
|
this.addIceCandidate(this.pc.peerid, event.candidate);
|
} else {
|
this.earlyCandidates.push(event.candidate);
|
}
|
}
|
else {
|
console.log("End of candidates.");
|
}
|
}
|
|
|
WebRtcStreamer.prototype.addIceCandidate = function(peerid, candidate) {
|
fetch(this.srvurl + "/api/addIceCandidate?peerid="+peerid, { method: "POST", body: JSON.stringify(candidate) })
|
.then(this._handleHttpErrors)
|
.then( (response) => (response.json()) )
|
.then( (response) => {console.log("addIceCandidate ok:" + response)})
|
.catch( (error) => this.onError("addIceCandidate " + error ))
|
}
|
|
/*
|
* RTCPeerConnection AddTrack callback
|
*/
|
WebRtcStreamer.prototype.onAddStream = function(event) {
|
console.log("Remote track added:" + JSON.stringify(event));
|
|
this.videoElement.srcObject = event.stream;
|
var promise = this.videoElement.play();
|
if (promise !== undefined) {
|
var bind = this;
|
promise.catch(function(error) {
|
console.warn("error:"+error);
|
bind.videoElement.setAttribute("controls", true);
|
});
|
}
|
}
|
|
/*
|
* AJAX /call callback
|
*/
|
WebRtcStreamer.prototype.onReceiveCall = function(dataJson) {
|
var bind = this;
|
console.log("offer: " + JSON.stringify(dataJson));
|
var descr = new RTCSessionDescription(dataJson);
|
this.pc.setRemoteDescription(descr
|
, function() {
|
console.log ("setRemoteDescription ok");
|
while (bind.earlyCandidates.length) {
|
var candidate = bind.earlyCandidates.shift();
|
bind.addIceCandidate.call(bind, bind.pc.peerid, candidate);
|
}
|
|
bind.getIceCandidate.call(bind)
|
}
|
, function(error) {
|
console.log ("setRemoteDescription error:" + JSON.stringify(error));
|
});
|
}
|
|
/*
|
* AJAX /getIceCandidate callback
|
*/
|
WebRtcStreamer.prototype.onReceiveCandidate = function(dataJson) {
|
console.log("candidate: " + JSON.stringify(dataJson));
|
if (dataJson) {
|
for (var i=0; i<dataJson.length; i++) {
|
var candidate = new RTCIceCandidate(dataJson[i]);
|
|
console.log("Adding ICE candidate :" + JSON.stringify(candidate) );
|
this.pc.addIceCandidate(candidate
|
, function() { console.log ("addIceCandidate OK"); }
|
, function(error) { console.log ("addIceCandidate error:" + JSON.stringify(error)); } );
|
}
|
this.pc.addIceCandidate();
|
}
|
}
|
|
|
/*
|
* AJAX callback for Error
|
*/
|
WebRtcStreamer.prototype.onError = function(status) {
|
console.log("onError:" + status);
|
}
|
|
return WebRtcStreamer;
|
})();
|
|
if (typeof window !== 'undefined' && typeof window.document !== 'undefined') {
|
window.WebRtcStreamer = WebRtcStreamer;
|
}
|
if (typeof module !== 'undefined' && typeof module.exports !== 'undefined') {
|
module.exports = WebRtcStreamer;
|
}
|
