How to use swapRidAndMidExtensionsInSimulcastOffer method in wpt

Best JavaScript code snippet using wpt

simulcast.js

Source:simulcast.js

...11  'urn:ietf:params:rtp-hdrext:sdes:mid',12  'urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id',13  'urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id',14];15function swapRidAndMidExtensionsInSimulcastOffer(offer, rids) {16  const sections = SDPUtils.splitSections(offer.sdp);17  const dtls = SDPUtils.getDtlsParameters(sections[1], sections[0]);18  const ice = SDPUtils.getIceParameters(sections[1], sections[0]);19  const rtpParameters = SDPUtils.parseRtpParameters(sections[1]);20  // The gist of this hack is that rid and mid have the same wire format.21  const rid = rtpParameters.headerExtensions.find(ext => ext.uri === 'urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id');22  rtpParameters.headerExtensions = rtpParameters.headerExtensions.filter(ext => {23    return !extensionsToFilter.includes(ext.uri);24  });25  // This tells the other side that the RID packets are actually mids.26  rtpParameters.headerExtensions.push({id: rid.id, uri: 'urn:ietf:params:rtp-hdrext:sdes:mid', direction: 'sendrecv'});27  // Filter rtx as we have no way to (re)interpret rrid.28  // Not doing this makes probing use RTX, it's not understood and ramp-up is slower.29  rtpParameters.codecs = rtpParameters.codecs.filter(c => c.name.toUpperCase() !== 'RTX');30  let sdp = SDPUtils.writeSessionBoilerplate() +31    SDPUtils.writeDtlsParameters(dtls, 'actpass') +32    SDPUtils.writeIceParameters(ice) +33    'a=group:BUNDLE ' + rids.join(' ') + '\r\n';34  const baseRtpDescription = SDPUtils.writeRtpDescription('video', rtpParameters);35  rids.forEach(rid => {36    sdp += baseRtpDescription +37        'a=mid:' + rid + '\r\n' +38        'a=msid:rid-' + rid + ' rid-' + rid + '\r\n';39  });40  return sdp;41}42function swapRidAndMidExtensionsInSimulcastAnswer(answer, localDescription, rids) {43  const sections = SDPUtils.splitSections(answer.sdp);44  const dtls = SDPUtils.getDtlsParameters(sections[1], sections[0]);45  const ice = SDPUtils.getIceParameters(sections[1], sections[0]);46  const rtpParameters = SDPUtils.parseRtpParameters(sections[1]);47  rtpParameters.headerExtensions = rtpParameters.headerExtensions.filter(ext => {48    return !extensionsToFilter.includes(ext.uri);49  });50  const localMid = SDPUtils.getMid(SDPUtils.splitSections(localDescription.sdp)[1]);51  let sdp = SDPUtils.writeSessionBoilerplate() +52    SDPUtils.writeDtlsParameters(dtls, 'active') +53    SDPUtils.writeIceParameters(ice) +54    'a=group:BUNDLE ' + localMid + '\r\n';55  sdp += SDPUtils.writeRtpDescription('video', rtpParameters);56  sdp += 'a=mid:' + localMid + '\r\n';57  rids.forEach(rid => {58    sdp += 'a=rid:' + rid + ' recv\r\n';59  });60  sdp += 'a=simulcast:recv ' + rids.join(';') + '\r\n';61  // Re-add headerextensions we filtered.62  const headerExtensions = SDPUtils.parseRtpParameters(SDPUtils.splitSections(localDescription.sdp)[1]).headerExtensions;63  headerExtensions.forEach(ext => {64    if (extensionsToFilter.includes(ext.uri)) {65      sdp += 'a=extmap:' + ext.id + ' ' + ext.uri + '\r\n';66    }67  });68  return sdp;69}70async function negotiateSimulcastAndWaitForVideo(t, rids, pc1, pc2, codec) {71  exchangeIceCandidates(pc1, pc2);72  const metadataToBeLoaded = [];73  pc2.ontrack = (e) => {74    const stream = e.streams[0];75    const v = document.createElement('video');76    v.autoplay = true;77    v.srcObject = stream;78    v.id = stream.id79    metadataToBeLoaded.push(new Promise((resolve) => {80        v.addEventListener('loadedmetadata', () => {81            resolve();82        });83    }));84  };85  const sendEncodings = rids.map(rid => ({rid}));86  // Use a 2X downscale factor between each layer. To improve ramp-up time, the87  // top layer is scaled down by a factor 2. Smaller layer comes first. For88  // example if MediaStreamTrack is 720p and we want to send three layers we'll89  // get {90p, 180p, 360p}.90  let scaleResolutionDownBy = 2;91  for (let i = sendEncodings.length - 1; i >= 0; --i) {92    sendEncodings[i].scaleResolutionDownBy = scaleResolutionDownBy;93    scaleResolutionDownBy *= 2;94  }95  // Use getUserMedia as getNoiseStream does not have enough entropy to ramp-up.96  await setMediaPermission();97  const stream = await navigator.mediaDevices.getUserMedia({video: {width: 1280, height: 720}});98  t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));99  const transceiver = pc1.addTransceiver(stream.getVideoTracks()[0], {100    streams: [stream],101    sendEncodings: sendEncodings,102  });103  if (codec) {104    preferCodec(transceiver, codec.mimeType, codec.sdpFmtpLine);105  }106  const offer = await pc1.createOffer();107  await pc1.setLocalDescription(offer),108  await pc2.setRemoteDescription({109    type: 'offer',110    sdp: swapRidAndMidExtensionsInSimulcastOffer(offer, rids),111  });112  const answer = await pc2.createAnswer();113  await pc2.setLocalDescription(answer);114  await pc1.setRemoteDescription({115    type: 'answer',116    sdp: swapRidAndMidExtensionsInSimulcastAnswer(answer, pc1.localDescription, rids),117  });118  assert_equals(metadataToBeLoaded.length, rids.length);119  return Promise.all(metadataToBeLoaded);...

Using AI Code Generation

1var wptool = require('./wptool');2var offer = wptool.swapRidAndMidExtensionsInSimulcastOffer(offer);3console.log(offer);4var wptool = {5  swapRidAndMidExtensionsInSimulcastOffer: function (offer) {6    var sdp = offer.sdp;7    var ridExt = "urn:3gpp:video-orientation";8    var midExt = "urn:ietf:params:rtp-hdrext:sdes:mid";9    var ridExtPos = sdp.indexOf(ridExt);10    var midExtPos = sdp.indexOf(midExt);11    var ridExtLine = sdp.substring(ridExtPos, sdp.indexOf("a=rtcp-fb", ridExtPos));12    var midExtLine = sdp.substring(midExtPos, sdp.indexOf("a=rtcp-fb", midExtPos));13    var ridExtLinePos = sdp.indexOf(ridExtLine);14    var midExtLinePos = sdp.indexOf(midExtLine);15    sdp = sdp.substring(0, ridExtLinePos) + midExtLine + sdp.substring(ridExtLinePos + ridExtLine.length);16    sdp = sdp.substring(0, midExtLinePos) + ridExtLine + sdp.substring(midExtLinePos + midExtLine.length);17    offer.sdp = sdp;18    return offer;19  }20};21module.exports = wptool;

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