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<!doctype html>
<meta charset=utf-8>
<!-- This file contains a test that waits for two seconds. -->
<meta name="timeout" content="long">
<title>RTP clockrate</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../RTCPeerConnection-helper.js"></script>
<script>
'use strict';
async function initiateSingleTrackCallAndReturnReceiver(t, kind) {
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
const stream = await getNoiseStream({[kind]:true});
const [track] = stream.getTracks();
t.add_cleanup(() => track.stop());
pc1.addTrack(track, stream);
exchangeIceCandidates(pc1, pc2);
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
await exchangeAnswer(pc1, pc2);
await waitForConnectionStateChange(pc2, ['connected']);
return trackEvent.receiver;
}
promise_test(async t => {
// the getSynchronizationSources API exposes the rtp timestamp.
const receiver = await initiateSingleTrackCallAndReturnReceiver(t, 'video');
const first = await listenForSSRCs(t, receiver);
await new Promise(resolve => t.step_timeout(resolve, 2000));
const second = await listenForSSRCs(t, receiver);
// rtpTimestamp may wrap at 0xffffffff, take care of that.
const actualClockRate = ((second[0].rtpTimestamp - first[0].rtpTimestamp + 0xffffffff) % 0xffffffff) / (second[0].timestamp - first[0].timestamp) * 1000;
assert_approx_equals(actualClockRate, 90000, 9000, 'Video clockrate is approximately 90000');
}, 'video rtp timestamps increase by approximately 90000 per second');
</script>
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