108 lines
4.2 KiB
JavaScript
108 lines
4.2 KiB
JavaScript
'use strict';
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// This file depends on `webrtc/RTCPeerConnection-helper.js`
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// which should be loaded from the main HTML file.
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var kAbsCaptureTime =
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'http://www.webrtc.org/experiments/rtp-hdrext/abs-capture-time';
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function addHeaderExtensionToSdp(sdp, uri) {
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// Find the highest used header extension id by sorting the extension ids used,
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// eliminating duplicates and adding one. This is not quite correct
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// but this code will go away with the header extension API.
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const usedIds = sdp.split('\n')
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.filter(line => line.startsWith('a=extmap:'))
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.map(line => parseInt(line.split(' ')[0].substring(9), 10))
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.sort((a, b) => a - b)
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.filter((item, index, array) => array.indexOf(item) === index);
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const nextId = usedIds[usedIds.length - 1] + 1;
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const extmapLine = 'a=extmap:' + nextId + ' ' + uri + '\r\n';
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const sections = sdp.split('\nm=').map((part, index) => {
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return (index > 0 ? 'm=' + part : part).trim() + '\r\n';
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});
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const sessionPart = sections.shift();
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return sessionPart + sections.map(mediaSection => mediaSection + extmapLine).join('');
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}
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// TODO(crbug.com/1051821): Use RTP header extension API instead of munging
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// when the RTP header extension API is implemented.
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async function addAbsCaptureTimeAndExchangeOffer(caller, callee) {
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let offer = await caller.createOffer();
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// Absolute capture time header extension may not be offered by default,
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// in such case, munge the SDP.
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offer.sdp = addHeaderExtensionToSdp(offer.sdp, kAbsCaptureTime);
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await caller.setLocalDescription(offer);
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return callee.setRemoteDescription(offer);
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}
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// TODO(crbug.com/1051821): Use RTP header extension API instead of munging
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// when the RTP header extension API is implemented.
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async function checkAbsCaptureTimeAndExchangeAnswer(caller, callee,
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absCaptureTimeAnswered) {
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let answer = await callee.createAnswer();
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const extmap = new RegExp('a=extmap:\\d+ ' + kAbsCaptureTime + '\r\n', 'g');
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if (answer.sdp.match(extmap) == null) {
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// We expect that absolute capture time RTP header extension is answered.
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// But if not, there is no need to proceed with the test.
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assert_false(absCaptureTimeAnswered, 'Absolute capture time RTP ' +
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'header extension is not answered');
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} else {
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if (!absCaptureTimeAnswered) {
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// We expect that absolute capture time RTP header extension is not
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// answered, but it is, then we munge the answer to remove it.
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answer.sdp = answer.sdp.replace(extmap, '');
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}
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}
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await callee.setLocalDescription(answer);
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return caller.setRemoteDescription(answer);
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}
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async function exchangeOfferAndListenToOntrack(t, caller, callee,
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absCaptureTimeOffered) {
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const ontrackPromise = addEventListenerPromise(t, callee, 'track');
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// Absolute capture time header extension is expected not offered by default,
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// and thus munging is needed to enable it.
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await absCaptureTimeOffered
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? addAbsCaptureTimeAndExchangeOffer(caller, callee)
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: exchangeOffer(caller, callee);
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return ontrackPromise;
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}
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async function initiateSingleTrackCall(t, cap, absCaptureTimeOffered,
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absCaptureTimeAnswered) {
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const caller = new RTCPeerConnection();
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t.add_cleanup(() => caller.close());
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const callee = new RTCPeerConnection();
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t.add_cleanup(() => callee.close());
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const stream = await getNoiseStream(cap);
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stream.getTracks().forEach(track => {
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caller.addTrack(track, stream);
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t.add_cleanup(() => track.stop());
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});
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// TODO(crbug.com/988432): `getSynchronizationSources() on the audio side
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// needs a hardware sink for the returned dictionary entries to get updated.
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const remoteVideo = document.getElementById('remote');
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callee.ontrack = e => {
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remoteVideo.srcObject = e.streams[0];
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}
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exchangeIceCandidates(caller, callee);
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await exchangeOfferAndListenToOntrack(t, caller, callee,
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absCaptureTimeOffered);
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// Exchange answer and check whether the absolute capture time RTP header
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// extension is answered.
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await checkAbsCaptureTimeAndExchangeAnswer(caller, callee,
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absCaptureTimeAnswered);
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return [caller, callee];
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}
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