getUserMedia-audio-disabled-clone.https.html

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This WPT test may be referenced by the following Test IDs:
- /mediacapture-streams/getUserMedia-audio-disabled-clone.https.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>Test clone of disabled audio track from getUserMedia()</title>

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

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

<body></body>

<script>

'use strict';

async function promise_is_track_silent(track) {

  const ctx = new AudioContext();

  const sourceNode =

      new MediaStreamTrackAudioSourceNode(ctx, {mediaStreamTrack: track});

  const processor = ctx.createScriptProcessor(8192, 1, 0);

  sourceNode.connect(processor);

  const e = await new Promise(resolve => processor.onaudioprocess = resolve);

  ctx.close();

  const input = e.inputBuffer.getChannelData(0);

  for (const sample of input) {

    if (sample != 0.0) {

      return false;

  return true;

promise_test(async t => {

  const stream = await navigator.mediaDevices.getUserMedia({audio: true});

  const [track] = stream.getTracks();

  track.enabled = false;

  // media.getusermedia.microphone.off_while_disabled.delay_ms is 0.

  // Allow some events to be processed for DeviceListener::SetDeviceEnabled()

  // to change mDeviceState.mDeviceEnabled.

  for (const i of Array(2).keys()) {

    await new Promise(resolve => t.step_timeout(resolve, 0));

  const clone = track.clone();

  assert_false(clone.enabled, 'clone.enabled');

  assert_true(await promise_is_track_silent(clone),

              'clone silent before enabled');

  clone.enabled = true;

  assert_false(await promise_is_track_silent(clone),

               'clone silent after enabled');

  assert_false(track.enabled, 'track.enabled');

  assert_true(await promise_is_track_silent(track), 'track silent');

}, 'clone of disabled getUserMedia() audio track');

</script>