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<!doctype html>
<meta charset=utf-8>
<title>RTCRtpReceiver.prototype.getContributingSources</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="RTCPeerConnection-helper.js"></script>
<script>
'use strict';
async function connectAndExpectNoCsrcs(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);
// Some browsers might need an audio element attached to the DOM.
const element = document.createElement(kind);
element.autoplay = true;
element.srcObject = trackEvent.streams[0];
document.body.appendChild(element);
t.add_cleanup(() => { document.body.removeChild(element) });
assert_array_equals(trackEvent.receiver.getContributingSources(), []);
}
promise_test(async t => {
await connectAndExpectNoCsrcs(t, 'audio');
}, '[audio] getContributingSources() returns an empty list in loopback call');
promise_test(async t => {
await connectAndExpectNoCsrcs(t, 'video');
}, '[video] getContributingSources() returns an empty list in loopback call');
</script>
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