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<!doctype html>
<meta charset=utf-8>
<!-- This file contains a test that waits for 2 seconds. -->
<meta name="timeout" content="long">
<title>captureTimestamp attribute in RTCRtpSynchronizationSource</title>
<div><video id="remote" width="124" height="124" autoplay></video></div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/webrtc/RTCPeerConnection-helper.js"></script>
<script src="/webrtc-extensions/RTCRtpSynchronizationSource-helper.js"></script>
<script>
'use strict';
function listenForCaptureTimestamp(t, receiver) {
return new Promise((resolve) => {
function listen() {
const ssrcs = receiver.getSynchronizationSources();
assert_true(ssrcs != undefined);
if (ssrcs.length > 0) {
assert_equals(ssrcs.length, 1);
if (ssrcs[0].captureTimestamp != undefined) {
resolve(ssrcs[0].captureTimestamp);
return true;
}
}
return false;
};
t.step_wait(listen, 'No abs-capture-time capture time header extension.');
});
}
// Passes if `getSynchronizationSources()` contains `captureTimestamp` if and
// only if expected.
for (const kind of ['audio', 'video']) {
promise_test(async t => {
const [caller, callee] = await initiateSingleTrackCall(
t, /* caps= */{[kind]: true}, /* absCaptureTimeOffered= */false,
/* absCaptureTimeAnswered= */false);
const receiver = callee.getReceivers()[0];
for (const ssrc of await listenForSSRCs(t, receiver)) {
assert_equals(typeof ssrc.captureTimestamp, 'undefined');
}
}, '[' + kind + '] getSynchronizationSources() should not contain ' +
'captureTimestamp if absolute capture time RTP header extension is not ' +
'offered');
promise_test(async t => {
const [caller, callee] = await initiateSingleTrackCall(
t, /* caps= */{[kind]: true}, /* absCaptureTimeOffered= */false,
/* absCaptureTimeAnswered= */false);
const receiver = callee.getReceivers()[0];
for (const ssrc of await listenForSSRCs(t, receiver)) {
assert_equals(typeof ssrc.captureTimestamp, 'undefined');
}
}, '[' + kind + '] getSynchronizationSources() should not contain ' +
'captureTimestamp if absolute capture time RTP header extension is ' +
'offered, but not answered');
promise_test(async t => {
const [caller, callee] = await initiateSingleTrackCall(
t, /* caps= */{[kind]: true}, /* absCaptureTimeOffered= */true,
/* absCaptureTimeAnswered= */true);
const receiver = callee.getReceivers()[0];
await listenForCaptureTimestamp(t, receiver);
}, '[' + kind + '] getSynchronizationSources() should contain ' +
'captureTimestamp if absolute capture time RTP header extension is ' +
'negotiated');
}
// Passes if `captureTimestamp` for audio and video are comparable, which is
// expected since the test creates a local peer connection between `caller` and
// `callee`.
promise_test(async t => {
const [caller, callee] = await initiateSingleTrackCall(
t, /* caps= */{audio: true, video: true},
/* absCaptureTimeOffered= */true, /* absCaptureTimeAnswered= */true);
const receivers = callee.getReceivers();
assert_equals(receivers.length, 2);
let captureTimestamps = [undefined, undefined];
const t0 = performance.now();
for (let i = 0; i < 2; ++i) {
captureTimestamps[i] = await listenForCaptureTimestamp(t, receivers[i]);
}
const t1 = performance.now();
assert_less_than(Math.abs(captureTimestamps[0] - captureTimestamps[1]),
t1 - t0);
}, 'Audio and video RTCRtpSynchronizationSource.captureTimestamp are ' +
'comparable');
</script>
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