test_multiple_mediastreamtracks.html

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<!DOCTYPE HTML>

<html>

<head>

  <title>Test the ability of MediaStream with multiple MediaStreamTracks</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

  <script type="text/javascript" src="manifest.js"></script>

  <script type="text/javascript" src="gUM_support.js"></script>

</head>

<body>

<pre id="test">

<script class="testbody" type="text/javascript">

async function startTest() {

  try {

    await setupGetUserMediaTestPrefs();

    let orgStream = await navigator.mediaDevices.getUserMedia({audio: true, video: true});

    let a = orgStream.getAudioTracks()[0];

    let v = orgStream.getVideoTracks()[0];

    let stream = new MediaStream([a, a, a, a, v, v, v].map(track => track.clone()));

    let element = document.createElement("video");

    element.onloadedmetadata = function() {

      is(stream.getAudioTracks().length, 4, 'Length of audio tracks should be 4.');

      is(stream.getVideoTracks().length, 3, 'Length of vudio tracks should be 3.');

      SimpleTest.finish();

};

    element.srcObject = stream;

    element.play();

  } catch (err) {

    ok(false, 'Unexpected error fired with: ' + err);

    SimpleTest.finish();

SimpleTest.waitForExplicitFinish();

SpecialPowers.pushPrefEnv(

    "set": [

      ["media.track.enabled", true]

  }, startTest);

</script>

</pre>

</body>

</html>