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client.js
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client.js
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var pc = null, dc = null, dcInterval = null;
var preview = document.getElementById('preview');
function writeConsole(msg)
{
let consoleLog = document.getElementById('console');
consoleLog.textContent += msg + '\r\n';
consoleLog.scrollTop = consoleLog.scrollHeight;
}
function createPeerConnection() {
//Use Googles Turn server
var config = {
sdpSemantics: 'unified-plan',
iceServers:[{urls: ['stun:stun.l.google.com:19302']}]
};
pc = new RTCPeerConnection(config);
// register some listeners to help debugging
pc.addEventListener('icegatheringstatechange', function() {
writeConsole(pc.iceGatheringState);
}, false);
pc.addEventListener('iceconnectionstatechange', function() {
writeConsole(pc.iceConnectionState);
}, false);
pc.addEventListener('signalingstatechange', function() {
writeConsole(pc.signalingState);
}, false);
// connect video
pc.addEventListener('track', function(evt) {
if (evt.track.kind == 'video')
document.getElementById('video').srcObject = evt.streams[0];
});
return pc;
}
function negotiate() {
return pc.createOffer().then(function(offer) {
return pc.setLocalDescription(offer);
}).then(function() {
// wait for ICE gathering to complete
return new Promise(function(resolve) {
if (pc.iceGatheringState === 'complete') {
resolve();
} else {
function checkState() {
if (pc.iceGatheringState === 'complete') {
pc.removeEventListener('icegatheringstatechange', checkState);
resolve();
}
}
pc.addEventListener('icegatheringstatechange', checkState);
}
});
}).then(function() {
var offer = pc.localDescription;
var codec = "VP8/90000";
offer.sdp = sdpFilterCodec('video', codec, offer.sdp);
writeConsole(offer.sdp);
return fetch('/offer', {
body: JSON.stringify({
sdp: offer.sdp,
type: offer.type,
video_transform: "edges"
}),
headers: {
'Content-Type': 'application/json'
},
method: 'POST'
});
}).then(function(response) {
return response.json();
}).then(function(answer) {
writeConsole(answer.sdp);
return pc.setRemoteDescription(answer);
}).catch(function(e) {
alert(e);
});
}
function start() {
document.getElementById('start').style.display = 'none';
pc = createPeerConnection();
//mediaDevices constraints, be aware the browser may just ignore them
var constraints = {
audio:false,
video: {width: 320, height: 240, frameRate: { ideal: 10, max:20 } }
};
if (constraints.video) {
if(navigator.mediaDevices.getUserMedia){
navigator.mediaDevices.getUserMedia(constraints).then(function(stream) {
preview.srcObject = stream;
preview.onloadedmetadata = function(e) {
preview.play();
};
stream.getTracks().forEach(function(track) {
pc.addTrack(track, stream);
});
return negotiate();
}, function(err) {
alert('Could not acquire media: ' + err);
});
}
} else {
negotiate();
}
document.getElementById('stop').style.display = 'block';
}
function stop() {
document.getElementById('stop').style.display = 'none';
document.getElementById('start').style.display = 'block';
preview.pause();
// close data channel
if (dc) {
dc.close();
}
// close transceivers
if (pc.getTransceivers) {
pc.getTransceivers().forEach(function(transceiver) {
if (transceiver.stop) {
transceiver.stop();
}
});
}
// close local audio / video
pc.getSenders().forEach(function(sender) {
sender.track.stop();
});
// close peer connection
setTimeout(function() {
pc.close();
}, 500);
}
function sdpFilterCodec(kind, codec, realSdp) {
var allowed = []
var rtxRegex = new RegExp('a=fmtp:(\\d+) apt=(\\d+)\r$');
var codecRegex = new RegExp('a=rtpmap:([0-9]+) ' + escapeRegExp(codec))
var videoRegex = new RegExp('(m=' + kind + ' .*?)( ([0-9]+))*\\s*$')
var lines = realSdp.split('\n');
var isKind = false;
for (var i = 0; i < lines.length; i++) {
if (lines[i].startsWith('m=' + kind + ' ')) {
isKind = true;
} else if (lines[i].startsWith('m=')) {
isKind = false;
}
if (isKind) {
var match = lines[i].match(codecRegex);
if (match) {
allowed.push(parseInt(match[1]));
}
match = lines[i].match(rtxRegex);
if (match && allowed.includes(parseInt(match[2]))) {
allowed.push(parseInt(match[1]));
}
}
}
var skipRegex = 'a=(fmtp|rtcp-fb|rtpmap):([0-9]+)';
var sdp = '';
isKind = false;
for (var i = 0; i < lines.length; i++) {
if (lines[i].startsWith('m=' + kind + ' ')) {
isKind = true;
} else if (lines[i].startsWith('m=')) {
isKind = false;
}
if (isKind) {
var skipMatch = lines[i].match(skipRegex);
if (skipMatch && !allowed.includes(parseInt(skipMatch[2]))) {
continue;
} else if (lines[i].match(videoRegex)) {
sdp += lines[i].replace(videoRegex, '$1 ' + allowed.join(' ')) + '\n';
} else {
sdp += lines[i] + '\n';
}
} else {
sdp += lines[i] + '\n';
}
}
return sdp;
}
function escapeRegExp(string) {
return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
}