RTCRtpScriptTransform-padding.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-encoded-transform/RTCRtpScriptTransform-padding.https.html - WPT Dashboard Interop Dashboard

<!doctype html>

<html>

<head>

<meta charset="utf-8">

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

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

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

</head>

<body>

<script>

// Bandwidth estimation can result in padding-only packets, especially when we

// deliberately starve the pacer by dropping everything but the first packet

// (see worker code). Test that such packets do not reach receive-side transforms

// as a frame with no data in it.

const kWindow = 8000;

promise_test(async t => {

  const worker = await createWorker("RTCRtpScriptTransform-padding-worker.js");

  const localStream = await getNoiseStream({audio: true});

  t.add_cleanup(() => localStream.getTracks().forEach(track => track.stop()));

  await createConnections(t, (firstConnection) => {

    const sender =

        firstConnection.addTrack(localStream.getTracks()[0], localStream);

    sender.transform = new RTCRtpScriptTransform(worker, {name: "sender"});

  }, (secondConnection) => {

    secondConnection.ontrack = (trackEvent) => {

      trackEvent.receiver.transform =

          new RTCRtpScriptTransform(worker, {name: "receiver"});

};

});

  assert_equals(await nextMessageOrTimeout(t, worker, kWindow),

    "frame", "the written frame should arrive");

  // The worker only speaks up once for the frame we wrote, so anything further

  // is padding that reached the transform.

  assert_equals(await nextMessageOrTimeout(t, worker, kWindow),

    undefined, "a padding-only packet is not a frame, and should not be" +

               " handed to a transform");

}, "Padding is not delivered to a receive-side transform as an empty frame.");

</script>

</body>

</html>