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chrome.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>
<h1>NOTE: this is deprecated. See the <a href="rid-as-mid.html">spec way</a> (but does not give you ssrcs)</h1>
<div id="local">
<h2>Local Video</h2>
</div>
<div id="remotes">
<h2>Remote Videos</h2>
</div>
<script>
const SDPUtils = adapter.sdp;
const nativeCreateOffer = window.RTCPeerConnection.prototype.createOffer;
window.RTCPeerConnection.prototype.createOffer = function() {
const offerOptions = arguments.length === 3 ? arguments[2] : arguments[0];
if (!(offerOptions && offerOptions.numberOfSimulcastLayers > 1)) {
return nativeCreateOffer.apply(this, arguments);
}
const {numberOfSimulcastLayers} = offerOptions;
delete offerOptions.numberOfSimulcastLayers;
return nativeCreateOffer.apply(this, arguments)
.then(({type, sdp}) => {
const sections = SDPUtils.splitSections(sdp);
/* sdp munging code. Really, its just extracting some information (ssrc, cname and msid) and reusing it.
* It could just set a different set of ssrc instead of trying to reuse the first.
*/
const firstVideoIndex = sections.findIndex(s => SDPUtils.getKind(s) === 'video');
if (firstVideoIndex === -1) {
return new RTCSessionDescription({type, sdp});
}
let cname;
let msid;
SDPUtils.matchPrefix(sections[firstVideoIndex], 'a=ssrc:').forEach(line => {
const media = SDPUtils.parseSsrcMedia(line);
if (media.attribute === 'cname') {
cname = media.value;
} else if (media.attribute === 'msid') {
msid = media.value;
}
});
const fidGroup = SDPUtils.matchPrefix(sections[firstVideoIndex], 'a=ssrc-group:FID ')[0].substr(17);
const lines = sections[firstVideoIndex].trim().split('\r\n').filter(line => {
return line.indexOf('a=ssrc:') !== 0 && line.indexOf('a=ssrc-group:') !== 0;
});
const simSSRCs = [];
const [videoSSRC1, rtxSSRC1] = fidGroup.split(' ').map(ssrc => parseInt(ssrc, 10));
lines.push('a=ssrc:' + videoSSRC1 + ' cname:' + cname);
lines.push('a=ssrc:' + videoSSRC1 + ' msid:' + msid);
lines.push('a=ssrc:' + rtxSSRC1 + ' cname:' + cname);
lines.push('a=ssrc:' + rtxSSRC1 + ' msid:' + msid);
lines.push('a=ssrc-group:FID ' + videoSSRC1 + ' ' + rtxSSRC1);
simSSRCs.push(videoSSRC1);
if (numberOfSimulcastLayers >= 2) {
const videoSSRC2 = videoSSRC1 + 1;
const rtxSSRC2 = videoSSRC1 + 2;
lines.push('a=ssrc:' + videoSSRC2 + ' cname:' + cname);
lines.push('a=ssrc:' + videoSSRC2 + ' msid:' + msid);
lines.push('a=ssrc:' + rtxSSRC2 + ' cname:' + cname);
lines.push('a=ssrc:' + rtxSSRC2 + ' msid:' + msid);
lines.push('a=ssrc-group:FID ' + videoSSRC2 + ' ' + rtxSSRC2);
simSSRCs.push(videoSSRC2);
}
if (numberOfSimulcastLayers >= 3) {
const videoSSRC3 = videoSSRC1 + 3;
const rtxSSRC3 = videoSSRC1 + 4;
lines.push('a=ssrc:' + videoSSRC3 + ' cname:' + cname);
lines.push('a=ssrc:' + videoSSRC3 + ' msid:' + msid);
lines.push('a=ssrc:' + rtxSSRC3 + ' cname:' + cname);
lines.push('a=ssrc:' + rtxSSRC3 + ' msid:' + msid);
lines.push('a=ssrc-group:FID ' + videoSSRC3 + ' ' + rtxSSRC3);
simSSRCs.push(videoSSRC3);
}
lines.push('a=ssrc-group:SIM ' + simSSRCs.join(' '));
sections[firstVideoIndex] = lines.join('\r\n') + '\r\n';
return new RTCSessionDescription({type, sdp: sections.join('')});
});
}
const pc1 = new RTCPeerConnection({sdpSemantics: 'unified-plan'});
const pc2 = new RTCPeerConnection({sdpSemantics: 'unified-plan'});
pc1.onicecandidate = (e) => pc2.addIceCandidate(e.candidate);
pc2.onicecandidate = (e) => pc1.addIceCandidate(e.candidate);
pc2.ontrack = (e) => show(e.streams[0], true);
navigator.mediaDevices.getUserMedia({video: {width: 1280, height: 720}})
.then((stream) => {
pc1.addTrack(stream.getVideoTracks()[0], stream);
show(stream, false);
return pc1.createOffer({numberOfSimulcastLayers: 3});
})
.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]);
const rtcpParameters = SDPUtils.parseRtcpParameters(sections[1]);
// unified plan things.
rtpParameters.headerExtensions = rtpParameters.headerExtensions.filter(ext => {
return ext.uri !== 'urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id' &&
ext.uri !== 'urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id' &&
ext.uri !== 'urn:ietf:params:rtp-hdrext:sdes:mid';
});
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) +
SDPUtils.writeRtcpParameters({
mux:rtcpParameters.mux,
reducedSize: rtcpParameters.reducedSize,
});
const fidGroups = SDPUtils.matchPrefix(sections[1], 'a=ssrc-group:FID ');
if (fidGroups.length > 0) {
const [videoSSRC1, rtxSSRC1] = fidGroups[0].substr(17).split(' ').map(ssrc => parseInt(ssrc, 10));
sdp += codecs +
'a=mid:0\r\n' +
'a=msid:low low\r\n' +
'a=ssrc:' + videoSSRC1 + ' cname:something\r\n' +
'a=ssrc:' + rtxSSRC1 + ' cname:something\r\n' +
'a=ssrc-group:FID ' + videoSSRC1 + ' ' + rtxSSRC1 + '\r\n';
}
if (fidGroups.length > 1) {
const [videoSSRC2, rtxSSRC2] = fidGroups[1].substr(17).split(' ').map(ssrc => parseInt(ssrc, 10));
sdp += codecs +
'a=mid:1\r\n' +
'a=msid:mid mid\r\n' +
'a=ssrc:' + videoSSRC2 + ' cname:something\r\n' +
'a=ssrc:' + rtxSSRC2 + ' cname:something\r\n' +
'a=ssrc-group:FID ' + videoSSRC2 + ' ' + rtxSSRC2 + '\r\n';
}
if (fidGroups.length > 2) {
const [videoSSRC3, rtxSSRC3] = fidGroups[2].substr(17).split(' ').map(ssrc => parseInt(ssrc, 10));
sdp += codecs +
'a=mid:2\r\n' +
'a=msid:hi hi\r\n' +
'a=ssrc:' + videoSSRC3 + ' cname:something\r\n' +
'a=ssrc:' + rtxSSRC3 + ' cname:something\r\n' +
'a=ssrc-group:FID ' + videoSSRC3 + ' ' + rtxSSRC3 + '\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]);
const rtcpParameters = SDPUtils.parseRtcpParameters(sections[1]);
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) +
SDPUtils.writeRtcpParameters({
mux:rtcpParameters.mux,
reducedSize: rtcpParameters.reducedSize,
});
sdp += codecs;
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>