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<meta charset=utf-8>
<title>payload type handling (assuming rtcp-mux)</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../third_party/sdp/sdp.js"></script>
<script>
promise_test(async t => {
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
const negotiate = async () => {
await pc1.setLocalDescription();
await pc2.setRemoteDescription(pc1.localDescription);
await pc2.setLocalDescription();
await pc1.setRemoteDescription(pc2.localDescription);
};
// Add audio, negotiate, stop the transceiver, negotiate again,
// add another audio transceiver and negotiate. This should re-use the m-line.
pc1.addTransceiver('audio');
await negotiate();
pc1.getTransceivers()[0].stop();
await negotiate();
pc1.addTransceiver('audio');
await negotiate();
let numberOfMediaSections = SDPUtils.splitSections(pc1.localDescription.sdp).length - 1;
assert_equals(numberOfMediaSections, 1, 'Audio m-line gets reused for audio transceiver');
// Stop the audio transceiver, negotiate, add a video transceiver, negotiate.
// This should reuse the m-line.
pc1.getTransceivers()[0].stop();
await negotiate();
pc1.addTransceiver('video');
await negotiate();
numberOfMediaSections = SDPUtils.splitSections(pc1.localDescription.sdp).length - 1;
assert_equals(numberOfMediaSections, 1, 'Audio m-line gets reused for video transceiver');
// Add another video transceiver after stopping the current one.
// This should re-use the m-line.
pc1.getTransceivers()[0].stop();
await negotiate();
pc1.addTransceiver('video');
await negotiate();
numberOfMediaSections = SDPUtils.splitSections(pc1.localDescription.sdp).length - 1;
assert_equals(numberOfMediaSections, 1, 'Video m-line gets reused for video transceiver');
}, 'Reuses m-lines in local negotiation');
promise_test(async t => {
// SDP with a rejected video m-line.
const sdp = `v=0
o=- 0 3 IN IP4 127.0.0.1
s=-
t=0 0
a=fingerprint:sha-256 A7:24:72:CA:6E:02:55:39:BA:66:DF:6E:CC:4C:D8:B0:1A:BF:1A:56:65:7D:F4:03:AD:7E:77:43:2A:29:EC:93
m=video 0 UDP/TLS/RTP/SAVPF 100
c=IN IP4 0.0.0.0
a=rtcp-mux
a=sendonly
a=mid:video
a=rtpmap:100 VP8/90000
a=setup:actpass
a=ice-ufrag:ETEn
a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l
`;
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
await pc1.setRemoteDescription({type: 'offer', sdp});
await pc1.setLocalDescription();
assert_equals(pc1.getTransceivers().length, 0);
pc1.addTransceiver('audio');
let offer = await pc1.createOffer();
let numberOfMediaSections = SDPUtils.splitSections(offer.sdp).length - 1;
assert_equals(numberOfMediaSections, 1, 'Remote video m-line gets reused for audio transceiver');
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
await pc2.setRemoteDescription({type: 'offer', sdp});
await pc2.setLocalDescription();
assert_equals(pc2.getTransceivers().length, 0);
pc1.addTransceiver('video');
offer = await pc2.createOffer();
numberOfMediaSections = SDPUtils.splitSections(offer.sdp).length - 1;
assert_equals(numberOfMediaSections, 1, 'Remote video m-line gets reused for video transceiver');
}, 'Reuses m-lines in remote negotiation');
</script>
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