Quelle  test_multiple_mediastreamtracks.html   Sprache: HTML

<!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>