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client.js
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/*
client.js
This file was adapted from the aiortc server.py example code.
(https://github.com/aiortc/aiortc/tree/main/examples/server)
TODO: Implement video calling. See https://github.com/aiortc/aiortc/issues/334
*/
// get DOM elements
var dataChannelLog = document.getElementById('data-channel'),
iceConnectionLog = document.getElementById('ice-connection-state'),
iceGatheringLog = document.getElementById('ice-gathering-state'),
signalingLog = document.getElementById('signaling-state');
// peer connection
var pc = null;
// data channel
var dc = null, dcInterval = null;
function createPeerConnection() {
var config = {
sdpSemantics: 'unified-plan'
};
// if (document.getElementById('use-stun').checked) {
// config.iceServers = [{urls: ['stun:stun.l.google.com:19302']}];
// }
pc = new RTCPeerConnection(config); // Create RTC Peer Connection
// register some listeners to help debugging
pc.addEventListener('icegatheringstatechange', function() {
iceGatheringLog.textContent += ' -> ' + pc.iceGatheringState;
}, false);
iceGatheringLog.textContent = pc.iceGatheringState;
pc.addEventListener('iceconnectionstatechange', function() {
iceConnectionLog.textContent += ' -> ' + pc.iceConnectionState;
}, false);
iceConnectionLog.textContent = pc.iceConnectionState;
pc.addEventListener('signalingstatechange', function() {
signalingLog.textContent += ' -> ' + pc.signalingState;
}, false);
signalingLog.textContent = pc.signalingState;
// connect audio / video // Event Listener activated whenever a new "track" is established (video, audio) flow from server-side to client-side
pc.addEventListener('track', function(evt) {
if (evt.track.kind == 'video')
document.getElementById('video').srcObject = evt.streams[0];
else
document.getElementById('audio').srcObject = evt.streams[0];
});
return pc;
}
// Offerer side
function negotiate() {
return pc.createOffer().then(function(offer) {
return pc.setLocalDescription(offer); // generated offer is set to the pc object (i.e. )
console.log(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;
// codec = document.getElementById('audio-codec').value;
// if (codec !== 'default') {
// offer.sdp = sdpFilterCodec('audio', codec, offer.sdp);
// }
// codec = document.getElementById('video-codec').value;
// if (codec !== 'default') {
// offer.sdp = sdpFilterCodec('video', codec, offer.sdp);
// }
// offer transmitted via json
document.getElementById('offer-sdp').textContent = offer.sdp;
return fetch('/offer', {
body: JSON.stringify({
sdp: offer.sdp,
type: offer.type,
video_transform: 'pup'// document.getElementById('video-transform').value # hardcoded in
}),
headers: {
'Content-Type': 'application/json'
},
method: 'POST'
});
}).then(function(response) {
return response.json();
}).then(function(answer) {
document.getElementById('answer-sdp').textContent = answer.sdp;
return pc.setRemoteDescription(answer); // Answer passed back to front end pc object. Now remote description also knwos about session description of server peer
}).catch(function(e) {
alert(e);
});
// After this occurs, the browser and server are connected and can pass data back and forth!
}
function start() {
document.getElementById('start').style.display = 'none'; // Disables start button
pc = createPeerConnection(); // Calls our function createPeerConnection (see above)
var time_start = null;
// Set up time/date
function current_stamp() {
if (time_start === null) {
time_start = new Date().getTime();
return 0;
} else {
return new Date().getTime() - time_start;
}
}
// if (true) {//document.getElementById('use-datachannel').checked) {
// var parameters = JSON.parse(document.getElementById('datachannel-parameters').value);
// dc = pc.createDataChannel('chat', parameters);
// dc.onclose = function() {
// clearInterval(dcInterval);
// dataChannelLog.textContent += '- close\n';
// };
// dc.onopen = function() {
// dataChannelLog.textContent += '- open\n';
// dcInterval = setInterval(function() {
// var message = 'ping ' + current_stamp();
// dataChannelLog.textContent += '> ' + message + '\n';
// dc.send(message);
// }, 1000);
// };
// dc.onmessage = function(evt) {
// dataChannelLog.textContent += '< ' + evt.data + '\n';
// if (evt.data.substring(0, 4) === 'pong') {
// var elapsed_ms = current_stamp() - parseInt(evt.data.substring(5), 10);
// dataChannelLog.textContent += ' RTT ' + elapsed_ms + ' ms\n';
// }
// };
// }
// Will be passed to getUserMedia, which prompts user to allow access for video (and can do audio too)
var constraints = {
audio: false, // document.getElementById('use-audio').checked,
video: false
};
if (true) {//document.getElementById('use-video').checked) {
var resolution = "";//document.getElementById('video-resolution').value;
if (resolution) {
resolution = resolution.split('x');
constraints.video = {
width: parseInt(resolution[0], 0),
height: parseInt(resolution[1], 0)
};
} else {
constraints.video = true;
}
}
if (constraints.audio || constraints.video) {
if (constraints.video) {
document.getElementById('media').style.display = 'block';
}
navigator.mediaDevices.getUserMedia(constraints).then(function(stream) {
stream.getTracks().forEach(function(track) {
pc.addTrack(track, stream); // Connects video stream (track) from webcam to WebRTC connection
});
return negotiate();
}, function(err) {
alert('Could not acquire media: ' + err);
});
} else {
negotiate();
}
document.getElementById('stop').style.display = 'inline-block';
}
function stop() {
document.getElementById('stop').style.display = 'none';
// 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
}