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canvas_pseudo_simulcast.html
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canvas_pseudo_simulcast.html
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Canvas pseudo simulcast</title>
</head>
<body>
WebRTC Canvas pseudo simulcast sender, with hand signaling for Firefox-Firefox(49) or Chrome-Chrome(51)
<br />
<button id="start_button" onclick="startVideo()">StartVideo</button>
<button id="stop_button" onclick="stopVideo()">StopVideo</button>
<button type="button" onclick="connect();">Connect</button>
<button type="button" onclick="hangUp();">Hang Up</button>
<br />
<video id="local_video" width="642px" height="482px" style="border: solid 1px black;"></video>
<canvas id="canvas_middle" width="320px" height="240px" style="border: none;"></canvas>
<canvas id="canvas_low" width="240px" height="180px" style="border: none;"></canvas>
<br />
<p>SDP to send:<br /><textarea id="text-for-send-sdp" rows="5" cols="60" readonly="readonly">SDP to send</textarea></p>
<p>SDP to receive: <button type="button" onclick="onSDPText();">Receive SDP</button><br />
<textarea id="text-for-receive-sdp" rows="5" cols="60"></textarea>
</p>
<video id="video_middle" width="322px" height="242px" style="border: solid 1px black;"></video>
<video id="video_low" width="242px" height="182px" style="border: solid 1px black;"></video>
</body>
<script>
navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia ||
navigator.mozGetUserMedia || navigator.msGetUserMedia;
window.RTCPeerConnection = window.RTCPeerConnection || window.webkitRTCPeerConnection || window.mozRTCPeerConnection;
window.RTCIceCandidate = window.RTCIceCandidate || window.mozRTCIceCandidate || window.webkitRTCIceCandidate;
window.requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame ||
window.webkitRequestAnimationFrame;
window.cancelAnimationFrame = window.cancelAnimationFrame || window.mozCancelAnimationFrame ||
window.webkitCancelAnimationFrame;
let localVideo = document.getElementById('local_video');
let canvasMiddle = document.getElementById('canvas_middle');
let canvasLow = document.getElementById('canvas_low');
let ctxMiddle = canvasMiddle.getContext('2d');
let ctxLow = canvasLow.getContext('2d');
let localStream = null;
let localAudioStream = null;
let animationId = null;
let intervalId = null;
let canvasMiddleStream = null;
let canvasLowStream = null;
let videoMiddle = document.getElementById('video_middle');
let videoLow = document.getElementById('video_low');
var peerConnection = null;
var peerStarted = false;
// ----------------- handshake --------------
var textForSendSDP = document.getElementById('text-for-send-sdp');
var textToReceiveSDP = document.getElementById('text-for-receive-sdp');
function onSDPText() {
var text = textToReceiveSDP.value;
if (peerConnection) {
onAnswerText(text);
}
else {
onOfferText(text);
}
textToReceiveSDP.value ="";
}
function onOfferText(text) {
console.log("Received offer text...")
setOfferText(text);
}
function onAnswerText(text) {
console.log("Received answer text...")
setAnswerText(text);
}
function sendSDPText(text) {
console.log("---sending sdp text ---");
textForSendSDP.value = text;
textForSendSDP.focus();
textForSendSDP.select();
}
function startAudio() {
getDeviceStream({video: false, audio: true})
.then(function (stream) { // success
localAudioStream = stream;
logStream('localAudioStream', localAudioStream);
}).catch(function (error) { // error
console.error('getUserMedia error:', error);
return;
}
);
}
//let highRezo = { width: 1280, height: 720 };
function startVideo() {
getDeviceStream({video: true, audio: false})
//navigator.mediaDevices.getUserMedia({video: true, audio: true}) // separate audio
.then(function (stream) { // success
localStream = stream;
logStream('localStream', stream);
playVideo(localVideo, localStream);
canvasMiddleStream = canvasMiddle.captureStream(15);
playVideo(videoMiddle, canvasMiddleStream);
logStream('canvasMiddleStream', canvasMiddleStream);
canvasLowStream = canvasLow.captureStream(5);
playVideo(videoLow, canvasLowStream);
logStream('canvasLowStream', canvasLowStream);
startAudio();
// animation frame will be drop down, when window is hidden.
animationId = window.requestAnimationFrame(drawCanvas);
// use interval for updating while window is hidden
//intervalId = setInterval(drawCanvas, 50);
}).catch(function (error) { // error
console.error('getUserMedia error:', error);
return;
}
);
}
function stopVideo() {
pauseVideo(localVideo);
pauseVideo(videoMiddle);
pauseVideo(videoLow);
if (localStream) {
stopLocalStream(localStream);
localStream = null;
}
if (canvasMiddleStream) {
stopLocalStream(canvasMiddleStream);
canvasMiddleStream = null;
}
if (canvasLowStream) {
stopLocalStream(canvasLowStream);
canvasLowStream = null;
}
if (localAudioStream) {
stopLocalStream(localAudioStream);
localAudioStream = null;
}
if (animationId) {
window.cancelAnimationFrame(animationId);
animationId = null;
}
if (intervalId) {
clearInterval(intervalId);
intervalId = null;
}
}
function drawCanvas() {
ctxMiddle.drawImage(localVideo, 1, 1, 640, 480, 0, 0, 320, 240);
ctxMiddle.fillText("320x240 15fps",10,10);
ctxLow.drawImage(localVideo, 1, 1, 640, 480, 0, 0, 240, 180);
ctxLow.fillText("240x180 5fps",10,10);
// animation frame will be drop down, when window is hidden.
animationId = window.requestAnimationFrame(drawCanvas);
}
// ---- utility ----
function logStream(msg, stream) {
console.log(msg + ': id=' + stream.id);
var videoTracks = stream.getVideoTracks();
if (videoTracks) {
console.log('videoTracks.length=' + videoTracks.length);
for (var i = 0; i < videoTracks.length; i++) {
var track = videoTracks[i];
console.log('track.id=' + track.id);
}
}
var audioTracks = stream.getAudioTracks();
if (audioTracks) {
console.log('audioTracks.length=' + audioTracks.length);
for (var i = 0; i < audioTracks.length; i++) {
var track = audioTracks[i];
console.log('track.id=' + track.id);
}
}
}
function stopLocalStream(stream) {
let tracks = stream.getTracks();
if (! tracks) {
console.warn('NO tracks');
return;
}
for (let track of tracks) {
track.stop();
}
}
function getDeviceStream(option) {
if ('getUserMedia' in navigator.mediaDevices) {
console.log('navigator.mediaDevices.getUserMadia');
return navigator.mediaDevices.getUserMedia(option);
}
else {
console.log('wrap navigator.getUserMadia with Promise');
return new Promise(function(resolve, reject){
navigator.getUserMedia(option,
resolve,
reject
);
});
}
}
function playVideo(element, stream) {
if ('srcObject' in element) {
element.srcObject = stream;
}
else {
element.src = window.URL.createObjectURL(stream);
}
element.play();
element.volume = 0;
}
function pauseVideo(element) {
element.pause();
if ('srcObject' in element) {
element.srcObject = null;
}
else {
if (element.src && (element.src !== '') ) {
window.URL.revokeObjectURL(element.src);
}
element.src = '';
}
}
// ---------------------- connection handling -----------------------
function prepareNewConnection() {
var pc_config = {"iceServers":[]};
var peer = null;
try {
peer = new RTCPeerConnection(pc_config);
} catch (e) {
console.log("Failed to create peerConnection, exception: " + e.message);
}
peer.onnegotiationneeded = function(evt) {
console.log('onnegotiationneeded() evt:', evt);
};
peer.onicecandidate = function (evt) {
if (evt.candidate) {
console.log(evt.candidate);
} else {
console.log("empty ice event, send SDP now");
sendSDPText(peer.localDescription.sdp);
}
};
peer.onicecandidateerror = function (evt) {
console.error('ICE candidate ERROR:', evt);
};
peer.onsignalingstatechange = function() {
console.log('== signaling status=' + peer.signalingState);
};
peer.oniceconnectionstatechange = function() {
console.log('== ice connection status=' + peer.iceConnectionState + ' gahter=' + peer.iceGatheringState);
};
peer.onicegatheringstatechange = function() {
console.log('==***== ice gathering state=' + peer.iceGatheringState);
};
peer.onconnectionstatechange = function() {
console.log('==***== connection state=' + peer.connectionState);
};
peer.onremovestream = function(event) {
console.warn('onremovestream() NOT handled');
};
peer.ontrack = function(event) {
console.warn('ontrack() NOT handled');
}
if (localAudioStream) {
console.log('Adding localAudio stream...');
if ('addTrack' in peer) {
var sender = peer.addTrack(localAudioStream.getAudioTracks()[0], localAudioStream);
}
else {
peer.addStream(localAudioStream);
}
}
if (localStream) {
console.log('Adding localStream stream...');
if ('addTrack' in peer) {
var sender = peer.addTrack(localStream.getVideoTracks()[0], localStream);
}
else {
peer.addStream(localStream);
}
}
/* separate audio
if (localStream) {
console.log('Adding localStream audioTrack...');
if (localStream.getAudioTracks().length > 0) {
var sender = peer.addTrack(localStream.getAudioTracks()[0], localStream);
}
}
*/
if (canvasMiddleStream) {
console.log('Adding canvasMiddle stream...');
if ('addTrack' in peer) {
var sender = peer.addTrack(canvasMiddleStream.getVideoTracks()[0], canvasMiddleStream);
if ('setParameters' in sender) {
var params = sender.getParameters();
console.log(params);
//params.encodings[0].maxBitrate = 256000;
params = { encodings: [{maxBitrate : 256000}]};
sender.setParameters(params)
//.then(function() {
// console.log('MiddleStream setParam promise --> setParameter()', sender.getParameters());
//});
}
}
else {
peer.addStream(canvasMiddleStream);
}
}
if (canvasLowStream) {
console.log('Adding canvasLow stream...');
if ('addTrack' in peer) {
var sender = peer.addTrack(canvasLowStream.getVideoTracks()[0], canvasLowStream);
if ('setParameters' in sender) {
var params = sender.getParameters();
console.log(params);
params = { encodings: [{maxBitrate : 128000}]};
sender.setParameters(params)
//.then(function() {
// console.log('LowStream setParam promise --> setParameter()', sender.getParameters());
//});
}
}
else {
peer.addStream(canvasLowStream);
}
}
return peer;
}
function makeOffer() {
peerConnection = prepareNewConnection();
peerConnection.createOffer()
.then(function (sessionDescription) {
console.log('createOffer() succsess in promise');
var sdp = setupBandwidth(sessionDescription.sdp);
sessionDescription.sdp = sdp;
return peerConnection.setLocalDescription(sessionDescription);
}).then(function() {
console.log('setLocalDescription() succsess in promise');
if ('getSenders' in peerConnection) {
var senders = peerConnection.getSenders();
for (sender of senders) {
var params = sender.getParameters();
console.log('---- sender param after setLocalDesc ----');
console.log(params);
}
}
}).catch(function(err) {
console.error(err);
});
}
function setupBandwidth(sdp) {
sdp = sdp.replace(/a=mid:sdparta_2\r\n/g, 'a=mid:sdparta_2\r\nb=AS:' + 256 + '\r\n');
sdp = sdp.replace(/a=mid:sdparta_3\r\n/g, 'a=mid:sdparta_3\r\nb=AS:' + 128 + '\r\n');
sdp = sdp.replace(/a=mid:video\r\n/g, 'a=mid:video\r\nb=AS:' + 512 + '\r\n');
return sdp;
}
function setOfferText(text) {
if (peerConnection) {
console.error('peerConnection alreay exist!');
}
peerConnection = prepareNewConnection();
var offer = new RTCSessionDescription({
type : 'offer',
sdp : text,
});
peerConnection.setRemoteDescription(offer)
.then(function() {
console.log('setRemoteDescription(offer) succsess in promise');
if ('getReceivers' in peerConnection) {
var receivers = peerConnection.getReceivers();
console.log('setRemoteDescription receivers:', receivers);
var receiver = receivers[0];
console.log('setRemoteDescription receiver:', receiver);
// not YET var params = receiver.getParameters();
//console.log('reveiver params:', params);
}
makeAnswer();
}).catch(function(err) {
console.error('setRemoteDescription(offer) ERROR: ', err);
});
}
function makeAnswer() {
console.log('sending Answer. Creating remote session description...' );
if (! peerConnection) {
console.error('peerConnection NOT exist!');
return;
}
peerConnection.createAnswer()
.then(function (sessionDescription) {
console.log('createAnswer() succsess in promise');
return peerConnection.setLocalDescription(sessionDescription);
}).then(function() {
console.log('setLocalDescription() succsess in promise');
if ('getReceivers' in peerConnection) {
var receivers = peerConnection.getReceivers();
console.log('setLocalDescription receivers:', receivers);
}
}).catch(function(err) {
console.error(err);
});
}
function setAnswerText(text) {
if (! peerConnection) {
console.error('peerConnection NOT exist!');
return;
}
var answer = new RTCSessionDescription({
type : 'answer',
sdp : text,
});
peerConnection.setRemoteDescription(answer)
.then(function() {
console.log('setRemoteDescription(answer) succsess in promise');
if ('getSenders' in peerConnection) {
var senders = peerConnection.getSenders();
for (sender of senders) {
var params = sender.getParameters();
console.log('---- sender param after setRemoteDesc ----');
console.log(params);
}
}
}).catch(function(err) {
console.error('setRemoteDescription(answer) ERROR: ', err);
});
}
function connect() {
if (!peerStarted) {
makeOffer();
peerStarted = true;
} else {
//alert("peer already started.");
console.warn('--force re create offer--');
makeOffer();
}
}
function hangUp() {
console.log("Hang up.");
if (peerConnection) {
peerConnection.close();
peerConnection = null;
peerStarted = false;
}
}
</script>
</html>