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firefox.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>
const pc1 = new RTCPeerConnection();
const pc2 = new RTCPeerConnection();
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',
];
navigator.mediaDevices.getUserMedia({video: {wіdth: 1280, height: 720}})
.then(stream => {
show(stream, false);
const sender = pc1.addTrack(stream.getTracks()[0], stream);
const bitrates = sessionStorage.bitrates ? JSON.parse(sessionStorage.bitrates) : [2500000, 500000, 150000];
sender.setParameters({encodings: [
{rid: "hi", maxBitrate: bitrates[0]},
{rid: "mid", maxBitrate: bitrates[1], scaleResolutionDownBy: 2},
{rid: "lo", maxBitrate: bitrates[2], scaleResolutionDownBy: 4},
]});
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 ssrcs = SDPUtils.matchPrefix(sections[1], 'a=ssrc:');
const midPrefix = adapter.browserDetails.version < 63 ? 'sdparta_' : '';
const rtpParameters = SDPUtils.parseRtpParameters(sections[1]);
const rtcpParameters = SDPUtils.parseRtcpParameters(sections[1]);
rtpParameters.headerExtensions = rtpParameters.headerExtensions.filter(ext => {
return !extensionsToFilter.includes(ext.uri);
});
const hasRtx = !!rtpParameters.codecs.find(c => c.name.toUpperCase() === 'RTX');
let sdp = SDPUtils.writeSessionBoilerplate() +
SDPUtils.writeDtlsParameters(dtls, 'actpass') +
SDPUtils.writeIceParameters(ice) +
'a=group:BUNDLE ' + midPrefix + '0 ' + midPrefix + '1 ' + midPrefix + '2\r\n' +
'a=msid-semantic:WMS *\r\n';
const codecs = SDPUtils.writeRtpDescription('video', rtpParameters) +
SDPUtils.writeRtcpParameters({
mux:rtcpParameters.mux,
reducedSize: rtcpParameters.reducedSize,
});
if (hasRtx) {
const fidGroups = SDPUtils.matchPrefix(sections[1], 'a=ssrc-group:FID ');
sdp += codecs +
'a=mid:' + midPrefix + '0\r\n' +
'a=msid:low low\r\n' +
ssrcs[0] + '\r\n' +
ssrcs[1] + '\r\n' +
fidGroups[0] + '\r\n';
sdp += codecs +
'a=mid:' + midPrefix + '1\r\n' +
'a=msid:mid mid\r\n' +
ssrcs[2] + '\r\n' +
ssrcs[3] + '\r\n' +
fidGroups[1] + '\r\n';
sdp += codecs +
'a=mid:' + midPrefix + '2\r\n' +
'a=msid:hi hi\r\n' +
ssrcs[4] + '\r\n' +
ssrcs[5] + '\r\n' +
fidGroups[2] + '\r\n';
} else {
sdp += codecs +
'a=mid:' + midPrefix + '0\r\n' +
'a=msid:low low\r\n' +
ssrcs[0] + '\r\n';
sdp += codecs +
'a=mid:' + midPrefix + '1\r\n' +
'a=msid:mid mid\r\n' +
ssrcs[1] + '\r\n';
sdp += codecs +
'a=mid:' + midPrefix + '2\r\n' +
'a=msid:hi hi\r\n' +
ssrcs[2] + '\r\n';
}
ssrc2track = ssrcs.map(line => (line.split(' ')[0].split(':')[1] >>> 0));
console.log('alice/pc1 offer:\n', offer.sdp)
// console.log('bob/pc2 offer:\n', sdp)
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 ssrcs = SDPUtils.matchPrefix(sections[1], 'a=ssrc:');
const localMid = SDPUtils.getMid(SDPUtils.splitSections(pc1.localDescription.sdp)[1]);
let sdp = SDPUtils.writeSessionBoilerplate() +
SDPUtils.writeDtlsParameters(dtls, 'active') +
SDPUtils.writeIceParameters(ice) +
'a=group:BUNDLE ' + localMid + '\r\n' +
'a=msid-semantic:WMS *\r\n';
const rtpParameters = SDPUtils.parseRtpParameters(sections[1]);
const rtcpParameters = SDPUtils.parseRtcpParameters(sections[1]);
const codecs = SDPUtils.writeRtpDescription('video', rtpParameters) +
SDPUtils.writeRtcpParameters({
mux:rtcpParameters.mux,
reducedSize: rtcpParameters.reducedSize,
});
sdp += codecs +
'a=mid:' + localMid + '\r\n';
sdp += 'a=rid:hi recv\r\n' +
'a=rid:mid recv\r\n' +
'a=rid:lo recv\r\n' +
'a=simulcast:recv hi;mid;lo\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';
}
});
console.log('alice/pc1 answer:', sdp)
// console.log('bob/pc2 answer:', answer.sdp)
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>