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encrypted.html
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<html>
<head>
<meta charset="utf-8">
<script src="https://webrtc.github.io/adapter/adapter-latest.js"></script>
<script src="https://rawgit.com/otalk/sdp/master/sdp.js"></script>
<script src="https://webrtc.github.io/samples/src/js/third_party/graph.js"></script>
<script src="test-assert.js"></script>
<script src="draw-graphs.js"></script>
<style>
video {
width: 320px;
}
</style>
</head>
<body>
<div id="local">
<h2>Local Video</h2>
</div>
<div id="remotes">
<h2>Remote Videos</h2>
</div>
<script>
let currentCryptoKey;
function sendTransform(chunk, controller) {
console.log('ST', chunk.data.byteLength);
if (currentCryptoKey) {
const view = new DataView(chunk.data);
// Any length that is needed can be used for the new buffer.
const newData = new ArrayBuffer(chunk.data.byteLength + 4);
const newView = new DataView(newData);
for (let i = 0; i < chunk.data.byteLength; ++i) {
const keyByte = currentCryptoKey.charCodeAt(i % currentCryptoKey.length);
newView.setInt8(i, view.getInt8(i) ^ keyByte);
}
// Append checksum
newView.setUint32(chunk.data.byteLength, 0xDEADBEEF);
chunk.data = newData;
}
controller.enqueue(chunk);
}
function receiveTransform(chunk, controller) {
console.log('RT', chunk.data.byteLength);
if (currentCryptoKey) {
const view = new DataView(chunk.data);
const checksum = view.getUint32(chunk.data.byteLength - 4);
if (checksum != 0xDEADBEEF) {
console.log('Corrupted frame received');
console.log(checksum.toString(16));
}
const newData = new ArrayBuffer(chunk.data.byteLength - 4);
const newView = new DataView(newData);
for (let i = 0; i < chunk.data.byteLength - 4; ++i) {
const keyByte = currentCryptoKey.charCodeAt(i % currentCryptoKey.length);
newView.setInt8(i, view.getInt8(i) ^ keyByte);
}
chunk.data = newData;
}
controller.enqueue(chunk);
}
const pc1 = new RTCPeerConnection({
sdpSemantics: 'unified-plan',
forceEncodedVideoInsertableStreams: true,
});
const pc2 = new RTCPeerConnection({
sdpSemantics: 'unified-plan',
forceEncodedVideoInsertableStreams: true,
});
pc1.onicecandidate = (e) => pc2.addIceCandidate(e.candidate);
pc2.onicecandidate = (e) => pc1.addIceCandidate(e.candidate);
pc2.ontrack = (e) => {
const transform = new TransformStream({
start() {},
flush() {},
transform: receiveTransform
});
const receiverStreams = e.receiver.createEncodedVideoStreams();
receiverStreams.readableStream
.pipeThrough(transform)
.pipeTo(receiverStreams.writableStream);
show(e.streams[0], true);
}
const extensionsToFilter = [
'urn:ietf:params:rtp-hdrext:sdes:mid',
'urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id',
'urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id',
];
const rids = [0, 1, 2];
navigator.mediaDevices.getUserMedia({video: {width: 1280, height: 720}})
.then((stream) => {
const transceiver = pc1.addTransceiver(stream.getVideoTracks()[0], {
streams: [stream],
sendEncodings: rids.map(rid => {rid}),
});
const {sender} = transceiver;
const senderStreams = sender.createEncodedVideoStreams();
const senderTransformStream = new TransformStream({
start() {},
flush() {},
transform: sendTransform
});
senderStreams.readableStream
.pipeThrough(senderTransformStream)
.pipeTo(senderStreams.writableStream);
show(stream, false);
return pc1.createOffer();
})
.then((offer) => {
const sections = SDPUtils.splitSections(offer.sdp);
const dtls = SDPUtils.getDtlsParameters(sections[1], sections[0]);
const ice = SDPUtils.getIceParameters(sections[1], sections[0]);
const rtpParameters = SDPUtils.parseRtpParameters(sections[1]);
// The gist of this hack is that rid and mid have the same wire format.
// Kudos to orphis for this clever hack!
const rid = rtpParameters.headerExtensions.find(ext => ext.uri === 'urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id');
rtpParameters.headerExtensions = rtpParameters.headerExtensions.filter(ext => {
return !extensionsToFilter.includes(ext.uri);
});
// This tells the other side that the RID packets are actually mids.
rtpParameters.headerExtensions.push({id: rid.id, uri: 'urn:ietf:params:rtp-hdrext:sdes:mid', direction: 'sendrecv'});
// Filter rtx as we have no wait to reinterpret rrid. Not doing this makes probing use RTX, its not understood
// and ramp-up is slower.
rtpParameters.codecs = rtpParameters.codecs.filter(c => c.name.toUpperCase() !== 'RTX');
let sdp = SDPUtils.writeSessionBoilerplate() +
SDPUtils.writeDtlsParameters(dtls, 'actpass') +
SDPUtils.writeIceParameters(ice) +
'a=group:BUNDLE 0 1 2\r\n' +
'a=msid-semantic:WMS *\r\n';
const codecs = SDPUtils.writeRtpDescription('video', rtpParameters);
sdp += codecs +
'a=setup:actpass\r\n' +
'a=mid:' + rids[0] + '\r\n' +
'a=msid:low low\r\n';
sdp += codecs +
'a=setup:actpass\r\n' +
'a=mid:' + rids[1] + '\r\n' +
'a=msid:mid mid\r\n';
sdp += codecs +
'a=setup:actpass\r\n' +
'a=mid:' + rids[2] + '\r\n' +
'a=msid:hi hi\r\n';
return Promise.all([
pc1.setLocalDescription(offer),
pc2.setRemoteDescription({
type: 'offer',
sdp,
}),
]);
})
.then(() => pc2.createAnswer())
.then(answer => {
const sections = SDPUtils.splitSections(answer.sdp);
const dtls = SDPUtils.getDtlsParameters(sections[1], sections[0]);
const ice = SDPUtils.getIceParameters(sections[1], sections[0]);
const rtpParameters = SDPUtils.parseRtpParameters(sections[1]);
// Avoid duplicating the mid extension even though Chrome does not care (boo!)
rtpParameters.headerExtensions = rtpParameters.headerExtensions.filter(ext => {
return !extensionsToFilter.includes(ext.uri);
});
let sdp = SDPUtils.writeSessionBoilerplate() +
SDPUtils.writeDtlsParameters(dtls, 'active') +
SDPUtils.writeIceParameters(ice) +
'a=group:BUNDLE 0\r\n' +
'a=msid-semantic:WMS *\r\n';
const codecs = SDPUtils.writeRtpDescription('video', rtpParameters);
sdp += codecs;
sdp += 'a=setup:active\r\n';
rids.forEach(rid => {
sdp += 'a=rid:' + rid + ' recv\r\n';
});
sdp += 'a=simulcast:recv ' + rids.join(';') + '\r\n';
sdp += 'a=mid:' + SDPUtils.getMid(SDPUtils.splitSections(pc1.localDescription.sdp)[1]) + '\r\n';
// Re-add headerextensions we filtered.
const headerExtensions = SDPUtils.parseRtpParameters(SDPUtils.splitSections(pc1.localDescription.sdp)[1]).headerExtensions;
headerExtensions.forEach(ext => {
if (extensionsToFilter.includes(ext.uri)) {
sdp += 'a=extmap:' + ext.id + ' ' + ext.uri + '\r\n';
}
});
return Promise.all([
pc2.setLocalDescription(answer),
pc1.setRemoteDescription({
type: 'answer',
sdp
}),
]);
})
.then(() => {
window.setInterval(() => {
draw(pc1, pc2);
}, 2000);
})
.catch(e => console.error(e));
</script>
</body>
</html>