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<!DOCTYPE html>
<meta charset="utf-8">
<title>Tests that RTCRtpReceiver is prepared to receive any negotiated video codec</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/webrtc/RTCPeerConnection-helper.js"></script>
<script src="/webrtc/third_party/sdp/sdp.js"></script>
<body>
<script>
'use strict'
function filterOnlySecondaryCodec(description) {
const sections = SDPUtils.splitSections(description.sdp);
const dtls = SDPUtils.getDtlsParameters(sections[1], sections[0]);
const ice = SDPUtils.getIceParameters(sections[1], sections[0]);
const rtpParameters = SDPUtils.parseRtpParameters(sections[1]);
const setupValue = SDPUtils.matchPrefix(description.sdp, 'a=setup:')[0].substring(8);
const mline = SDPUtils.parseMLine(sections[1]);
// Of all the codecs in the description, filter out one that has multiple
// payload types, and use only one of those payload types that is not the
// preferred codec.
//
// Ideally this would test all PTs through RTCRtpSender.setParameters, but
// Firefox does not at this time support RTCRtpEncodingParameters.codec:
// https://bugzilla.mozilla.org/show_bug.cgi?id=1894137
const codecs = {};
for (const codec of rtpParameters.codecs) {
if (["RED", "RTX", "ULPFEC"].includes(codec.name.toUpperCase())) {
continue;
}
codecs[codec.name] ??= [];
codecs[codec.name].push(codec);
}
const multipleCodecs = [];
for (const name of Object.keys(codecs)) {
if (codecs[name].length > 1) {
multipleCodecs.push(codecs[name]);
}
}
assert_implements_optional(multipleCodecs.length > 0, 'No codec with multiple payload types');
const multiplePtsCodecs = multipleCodecs[0];
const nonPreferredCodec = multiplePtsCodecs[1];
rtpParameters.codecs = [nonPreferredCodec];
return SDPUtils.writeSessionBoilerplate() +
SDPUtils.writeDtlsParameters(dtls, setupValue) +
SDPUtils.writeIceParameters(ice) +
SDPUtils.writeRtpDescription(mline.kind, rtpParameters);
}
promise_test(async t => {
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
pc1.onicecandidate = ({candidate}) => pc2.addIceCandidate(candidate);
pc2.onicecandidate = ({candidate}) => pc1.addIceCandidate(candidate);
const [track] = (await getNoiseStream({video: true})).getTracks();
t.add_cleanup(() => track.stop());
pc1.addTrack(track);
await pc1.setLocalDescription();
await pc2.setRemoteDescription(pc1.localDescription);
await pc2.setLocalDescription();
const nonPreferredAnswer = {type: 'answer', sdp: filterOnlySecondaryCodec(pc2.localDescription)};
await pc1.setRemoteDescription(nonPreferredAnswer);
// Verify that the right payloadType is sent, *and* received.
const start = performance.now();
const timeoutThreshold = start + 5000;
while (true) {
const stats = [...(await pc1.getStats()).values()].find(({type}) => type === 'outbound-rtp');
if (stats?.framesSent > 0) {
break;
}
if (performance.now() > timeoutThreshold) {
assert_unreached("Timed out waiting for sent frames");
}
await new Promise(r => t.step_timeout(r, 100));
}
while (true) {
const stats = [...(await pc2.getStats()).values()].find(({type}) => type === 'inbound-rtp');
if (stats?.framesReceived > 0) {
break;
}
if (performance.now() > timeoutThreshold) {
assert_unreached("Timed out waiting for received frames");
}
await new Promise(r => t.step_timeout(r, 100));
}
}, 'An RTCRtpReceiver is prepared to receive any negotiated codec.');
</script>
</body>
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