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spec.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://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>
const SDPUtils = adapter.sdp;
const pc1 = new RTCPeerConnection({sdpSemantics: 'unified-plan'});
const pc2 = new RTCPeerConnection({sdpSemantics: 'plan-b'});
pc1.onicecandidate = (e) => pc2.addIceCandidate(e.candidate);
pc2.onicecandidate = (e) => pc1.addIceCandidate(e.candidate);
pc2.ontrack = (e) => 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];
const recvSSRCs = {};
pc2.oniceconnectionstatechange = () => {
if (pc2.iceConnectionState === 'connected') {
const pollforssrcs = setInterval(() => {
pc2.getStats().then(stats => {
stats.forEach(report => {
if (report.type === 'inbound-rtp') {
if (!recvSSRCs[report.ssrc]) {
const {ssrc} = report;
recvSSRCs[ssrc] = true;
let {sdp} = pc2.remoteDescription;
sdp = sdp.split('\r\n').filter(line => {
if (line.indexOf('urn:ietf:params:rtp-hdrext:sdes') !== -1) {
return false;
}
if (line.indexOf('a=msid:') !== -1) {
return false;
}
return !line.startsWith('a=rid:') && !line.startsWith('a=simulcast');
}).join('\r\n');
sdp += 'a=ssrc:' + ssrc + ' cname:something\r\n' +
'a=ssrc:' + ssrc + ' msid:' + ssrc + ' ' + ssrc + '\r\n';
pc2.setRemoteDescription({type: 'offer', sdp})
.then(() => pc2.createAnswer())
.then((answer) => pc2.setLocalDescription(answer))
.then(() => {
console.log('done adding', ssrc);
})
.catch(e => console.error(e));
if (Object.keys(recvSSRCs).length === 3) {
clearInterval(pollforssrcs);
}
}
}
});
});
}, 100);
}
};
navigator.mediaDevices.getUserMedia({video: {width: 1280, height: 720}})
.then((stream) => {
pc1.addTransceiver(stream.getVideoTracks()[0], {
streams: [stream],
sendEncodings: rids.map(rid => {rid}),
});
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]);
rtpParameters.headerExtensions = rtpParameters.headerExtensions.filter(ext => {
return !extensionsToFilter.includes(ext.uri);
});
rtpParameters.codecs = rtpParameters.codecs.filter(c => c.name.toUpperCase() !== 'RTX');
const rtcpParameters = SDPUtils.parseRtcpParameters(sections[1]);
let sdp = SDPUtils.writeSessionBoilerplate() +
SDPUtils.writeDtlsParameters(dtls, 'actpass') +
SDPUtils.writeIceParameters(ice) +
'a=group:BUNDLE 0\r\n' +
'a=msid-semantic:WMS *\r\n';
const codecs = SDPUtils.writeRtpDescription('video', rtpParameters) +
SDPUtils.writeRtcpParameters({
mux:rtcpParameters.mux,
reducedSize: rtcpParameters.reducedSize,
});
sdp += codecs +
'a=setup:actpass\r\n' +
'a=mid:0\r\n';
const offer2 = {
type: 'offer',
sdp,
};
offer2.sdp = offer2.sdp.split('\r\n').filter(line => {
if (line.indexOf('urn:ietf:params:rtp-hdrext:sdes') !== -1) {
return false;
}
if (line.indexOf('a=msid:') !== -1) {
return false;
}
return !line.startsWith('a=rid:') && !line.startsWith('a=simulcast');
}).join('\r\n');
return Promise.all([
pc1.setLocalDescription(offer),
pc2.setRemoteDescription(offer2),
]);
})
.then(() => pc2.createAnswer())
.then(answer => {
let {sdp} = answer;
rids.forEach(rid => {
sdp += 'a=rid:' + rid + ' recv\r\n';
});
sdp += 'a=simulcast:recv ' + rids.join(';') + '\r\n';
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>