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