MediaStreamTrack-MediaElement-disabled-audio-is-silence.https.html

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This WPT test may be referenced by the following Test IDs:
- /mediacapture-streams/MediaStreamTrack-MediaElement-disabled-audio-is-silence.https.html - WPT Dashboard Interop Dashboard

<!doctype html>

<html>

<head>

<title>A disabled audio track is rendered as silence</title>

<link rel="author" title="Dominique Hazael-Massieux" href="mailto:dom@w3.org"/>

<link rel="help" href="http://dev.w3.org/2011/webrtc/editor/getusermedia.html#introduction">

<link rel="help" href="http://dev.w3.org/2011/webrtc/editor/getusermedia.html#mediastreams-as-media-elements">

</head>

<body>

<p class="instructions">When prompted, accept to share your audio stream.</p>

<h1 class="instructions">Description</h1>

<p class="instructions">This test checks that a disabled audio track in a

MediaStream is rendered as silence. It relies on the

<a href="https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html">

Web Audio API</a>.</p>

<div id='log'></div>

<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=permission-helper.js></script>

<script>

const aud = document.getElementById("aud");

promise_test(async t => {

  await setMediaPermission("granted", ["microphone"]);

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

  var ctx = new AudioContext();

  var streamSource = ctx.createMediaStreamSource(stream);

  var silenceDetector = ctx.createScriptProcessor(1024);

  var count = 10;

  let resolveAudioProcessPromise;

  const audioProcessed = new Promise(res => resolveAudioProcessPromise = res)

  silenceDetector.onaudioprocess = function (e) {

    var buffer1 = e.inputBuffer.getChannelData(0);

    var buffer2 = e.inputBuffer.getChannelData(1);

    var out = e.outputBuffer.getChannelData(0);

    out = new Float32Array(buffer1);

    for (var i = 0; i < buffer1.length; i++) {

      assert_equals(buffer1[i], 0, "Audio buffer entry #" + i + " in channel 0 is silent");

    for (var i = 0; i < buffer2.length; i++) {

      assert_equals(buffer2[i], 0, "Audio buffer entry #" + i + " in channel 1 is silent");

    count--;

    if (count === 0) {

      silenceDetector.onaudioprocess = null;

      resolveAudioProcessPromise();

};

  stream.getAudioTracks()[0].enabled = false;

  streamSource.connect(silenceDetector);

  silenceDetector.connect(ctx.destination);

}, "Tests that a disabled audio track in a MediaStream is rendered as silence");

</script>

</body>

</html>