vp9-scalability-mode.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/simulcast/vp9-scalability-mode.https.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<title>RTCPeerConnection Simulcast Tests</title>

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

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

<script src="simulcast.js"></script>

<script src="../RTCPeerConnection-helper.js"></script>

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

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

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

<script src="/resources/testdriver-vendor.js"></script>

<script src="../../mediacapture-streams/permission-helper.js"></script>

<script>

promise_test(async t => {

  assert_implements('getCapabilities' in RTCRtpSender, 'RTCRtpSender.getCapabilities not supported');

  assert_implements(RTCRtpSender.getCapabilities('video').codecs.find(c => c.mimeType.toLowerCase() === 'video/vP9'), 'VP9 not supported');

  const rids = [0, 1];

  const pc1 = new RTCPeerConnection();

  t.add_cleanup(() => pc1.close());

  const pc2 = new RTCPeerConnection();

  t.add_cleanup(() => pc2.close());

  // This is not a scalability mode test (see wpt/webrtc-svc/ for those) but a

  // VP9 simulcast test. Setting `scalabilityMode` should not be needed, however

  // some browsers interpret multiple VP9 encodings to mean multiple spatial

  // layers by default. During a transition period, Chromium-based browsers

  // requires explicitly specifying the scalability mode as a way to opt-in to

  // spec-compliant simulcast. See also wpt/webrtc/simulcast/vp9.https.html for

  // a version of this test that does not set the scalability mode.

  const scalabilityMode = 'L1T2';

  return negotiateSimulcastAndWaitForVideo(

      t, await getCameraStream(t), rids, pc1, pc2, {mimeType: 'video/VP9'},

      scalabilityMode);

}, 'VP9 simulcast setup with two streams and L1T2 set');

</script>