codecs-subsequent-offer.https.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /webrtc/protocol/codecs-subsequent-offer.https.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<meta name="timeout" content="long">

<title>RTCPeerConnection Codecs in subsequent offer</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="../third_party/sdp/sdp.js"></script>

<script>

'use strict';

// A test for https://www.rfc-editor.org/rfc/rfc8829.html#name-subsequent-offers

// The "m=" line and corresponding "a=rtpmap" and "a=fmtp" lines MUST only include

// media formats that have not been excluded by the codec preferences of the

// associated transceiver and also MUST include all currently available formats.

// A VP8-only offer.

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 9 RTP/SAVPF 100

c=IN IP4 0.0.0.0

a=rtcp-mux

a=sendrecv

a=mid:video

a=rtpmap:100 VP8/90000

a=setup:actpass

a=ice-ufrag:ETEn

a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l

`;

promise_test(async t => {

  const pc = new RTCPeerConnection();

  t.add_cleanup(() => pc.close());

  await pc.setRemoteDescription({type: 'offer', sdp});

  await pc.setLocalDescription();

  const transceiver = pc.getTransceivers()[0];

  assert_not_equals(transceiver.stopped, true);

  const offer = await pc.createOffer();

  const mediaSection = SDPUtils.getMediaSections(offer.sdp)[0];

  const rtpParameters = SDPUtils.parseRtpParameters(mediaSection);

  const vp8 = rtpParameters.codecs.filter(codec => codec.name === 'VP8');

  const h264 = rtpParameters.codecs.filter(codec => codec.name === 'H264');

  assert_greater_than(vp8.length, 0);

  assert_greater_than(h264.length, 0);

}, 'A subsequent offer after a VP8-only negotiation includes at least all mandatory to implement codecs');

</script>