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'use strict';
// This file depends on `webrtc/RTCPeerConnection-helper.js`
// which should be loaded from the main HTML file.
// TODO: Replace with IETF link.
var kAbsCaptureTime =
function addHeaderExtensionToSdp(sdp, uri) {
// Find the highest used header extension id by sorting the extension ids
// used, eliminating duplicates and adding one. This is not quite correct but
// this code will go away with the header extension API.
const usedIds =
sdp.split('\n')
.filter(line => line.startsWith('a=extmap:'))
.map(line => parseInt(line.split(' ')[0].substring(9), 10))
.sort((a, b) => a - b)
.filter((item, index, array) => array.indexOf(item) === index);
const nextId = usedIds[usedIds.length - 1] + 1;
const extmapLine = 'a=extmap:' + nextId + ' ' + uri + '\r\n';
const sections = sdp.split('\nm=').map((part, index) => {
return (index > 0 ? 'm=' + part : part).trim() + '\r\n';
});
const sessionPart = sections.shift();
return sessionPart +
sections.map(mediaSection => mediaSection + extmapLine).join('');
}
async function addAbsCaptureTimeAndExchangeOffer(caller, callee) {
let offer = await caller.createOffer();
// Absolute capture time header extension may not be offered by default,
// in such case, munge the SDP.
offer.sdp = addHeaderExtensionToSdp(offer.sdp, kAbsCaptureTime);
await caller.setLocalDescription(offer);
return callee.setRemoteDescription(offer);
}
async function checkAbsCaptureTimeAndExchangeAnswer(
caller, callee, absCaptureTimeAnswered) {
let answer = await callee.createAnswer();
const extmap = new RegExp('a=extmap:\\d+ ' + kAbsCaptureTime + '\r\n', 'g');
if (answer.sdp.match(extmap) == null) {
// We expect that absolute capture time RTP header extension is answered.
// But if not, there is no need to proceed with the test.
assert_false(
absCaptureTimeAnswered,
'Absolute capture time RTP ' +
'header extension is not answered');
} else {
if (!absCaptureTimeAnswered) {
// We expect that absolute capture time RTP header extension is not
// answered, but it is, then we munge the answer to remove it.
answer.sdp = answer.sdp.replace(extmap, '');
}
}
await callee.setLocalDescription(answer);
return caller.setRemoteDescription(answer);
}
async function exchangeOfferAndListenToOntrack(
t, caller, callee, absCaptureTimeOffered) {
const ontrackPromise = addEventListenerPromise(t, callee, 'track');
// Absolute capture time header extension is expected not offered by default,
// and thus munging is needed to enable it.
await absCaptureTimeOffered ?
addAbsCaptureTimeAndExchangeOffer(caller, callee) :
exchangeOffer(caller, callee);
return ontrackPromise;
}
async function initiateCall(
t, streamOptions, enableAbsCaptureTime, worker, enableSenderTransform,
enableReceiverTransform) {
const caller = new RTCPeerConnection();
t.add_cleanup(() => caller.close());
const callee = new RTCPeerConnection();
t.add_cleanup(() => callee.close());
const senderTransform = enableSenderTransform ?
new RTCRtpScriptTransform(worker, {name: 'sender'}) :
null;
const receiverTransform = enableReceiverTransform ?
new RTCRtpScriptTransform(worker, {name: 'receiver'}) :
null;
const stream = await getNoiseStream(streamOptions);
stream.getTracks().forEach(track => {
const sender = caller.addTrack(track, stream);
if (enableSenderTransform) {
sender.transform = senderTransform;
}
t.add_cleanup(() => track.stop());
});
callee.ontrack =
e => {
if (enableReceiverTransform) {
e.receiver.transform = receiverTransform;
}
}
exchangeIceCandidates(caller, callee);
await exchangeOfferAndListenToOntrack(
t, caller, callee, enableAbsCaptureTime);
// Exchange answer and check whether the absolute capture time RTP header
// extension is answered.
await checkAbsCaptureTimeAndExchangeAnswer(
caller, callee, enableAbsCaptureTime);
}