How to use addHeaderExtensionToSdp method in wpt

Best JavaScript code snippet using wpt

RTCRtpSynchronizationSource-helper.js

Source:RTCRtpSynchronizationSource-helper.js

2// This file depends on `webrtc/RTCPeerConnection-helper.js`3// which should be loaded from the main HTML file.4var kAbsCaptureTime =5    'http://www.webrtc.org/experiments/rtp-hdrext/abs-capture-time';6function addHeaderExtensionToSdp(sdp, uri) {7  const extmap = new RegExp('a=extmap:(\\d+)');8  let sdpLines = sdp.split('\r\n');9  // This assumes at most one audio m= section and one video m= section.10  // If more are present, only the first section of each kind is munged.11  for (const section of ['audio', 'video']) {12    let found_section = false;13    let maxId = undefined;14    let maxIdLine = undefined;15    let extmapAllowMixed = false;16    // find the largest header extension id for section.17    for (let i = 0; i < sdpLines.length; ++i) {18      if (!found_section) {19        if (sdpLines[i].startsWith('m=' + section)) {20          found_section = true;21        }22        continue;23      } else {24        if (sdpLines[i].startsWith('m=')) {25          // end of section26          break;27        }28      }29      if (sdpLines[i] === 'a=extmap-allow-mixed') {30        extmapAllowMixed = true;31      }32      let result = sdpLines[i].match(extmap);33      if (result && result.length === 2) {34        if (maxId == undefined || result[1] > maxId) {35          maxId = parseInt(result[1]);36          maxIdLine = i;37        }38      }39    }40    if (maxId == 14 && !extmapAllowMixed) {41      // Reaching the limit of one byte header extension. Adding two byte header42      // extension support.43      sdpLines.splice(maxIdLine + 1, 0, 'a=extmap-allow-mixed');44    }45    if (maxIdLine !== undefined) {46      sdpLines.splice(maxIdLine + 1, 0,47                      'a=extmap:' + (maxId + 1).toString() + ' ' + uri);48    }49  }50  return sdpLines.join('\r\n');51}52// TODO(crbug.com/1051821): Use RTP header extension API instead of munging53// when the RTP header extension API is implemented.54async function addAbsCaptureTimeAndExchangeOffer(caller, callee) {55  let offer = await caller.createOffer();56  // Absolute capture time header extension may not be offered by default,57  // in such case, munge the SDP.58  offer.sdp = addHeaderExtensionToSdp(offer.sdp, kAbsCaptureTime);59  await caller.setLocalDescription(offer);60  return callee.setRemoteDescription(offer);61}62// TODO(crbug.com/1051821): Use RTP header extension API instead of munging63// when the RTP header extension API is implemented.64async function checkAbsCaptureTimeAndExchangeAnswer(caller, callee,65                                                    absCaptureTimeAnswered) {66  let answer = await callee.createAnswer();67  const extmap = new RegExp('a=extmap:\\d+ ' + kAbsCaptureTime + '\r\n', 'g');68  if (answer.sdp.match(extmap) == null) {69    // We expect that absolute capture time RTP header extension is answered.70    // But if not, there is no need to proceed with the test.71    assert_false(absCaptureTimeAnswered, 'Absolute capture time RTP ' +72        'header extension is not answered');...

Using AI Code Generation

1addHeaderExtensionToSdp(sdp, 'urn:ietf:params:rtp-hdrext:ssrc-audio-level', 1, function(sdp) {2  console.log('sdp after adding header extension: ' + sdp);3});4removeHeaderExtensionFromSdp(sdp, 'urn:ietf:params:rtp-hdrext:ssrc-audio-level', function(sdp) {5  console.log('sdp after removing header extension: ' + sdp);6});7This project is licensed under the Apache License - see the [LICENSE](LICENSE) file for details

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