1 files changed, 35 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webrtc/simulcast/vp9-scalability-mode.https.html b/testing/web-platform/tests/webrtc/simulcast/vp9-scalability-mode.https.html
new file mode 100644
index 0000000000..9dc8a3103d
--- /dev/null
+++ b/testing/web-platform/tests/webrtc/simulcast/vp9-scalability-mode.https.html
@@ -0,0 +1,35 @@
+<!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 === '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
+  // many browsers interprets 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, rids, pc1, pc2, {mimeType: 'video/VP9'}, scalabilityMode);
+}, 'VP9 simulcast setup with two streams and L1T2 set');
+</script>