tor-browser

The Tor Browser
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test_setSinkId_preMutedElement.html (3280B)

      1 <!DOCTYPE HTML>
      2 <html>
      3 <head>
      4  <script src="mediaStreamPlayback.js"></script>
      5 </head>
      6 <body>
      7 <pre id="test">
      8 <script type="application/javascript">
      9 createHTML({
     10  title: "Test changing sink and muting before the MediaStream is set",
     11  bug: "1651049",
     12  visible: true
     13 });
     14 
     15 let getOutputDeviceId = async () => {
     16  let devices = await navigator.mediaDevices.enumerateDevices();
     17  let audios = devices.filter(d => d.kind == "audiooutput");
     18  ok(audios.length, "One or more output devices found.");
     19  return audios[0].deviceId;
     20 }
     21 
     22 let verifyAudioTone = async (ac, stream, freq) => {
     23  const toneAnalyser = new AudioStreamAnalyser(ac, stream);
     24  return toneAnalyser.waitForAnalysisSuccess(array => {
     25    const lowerFreq = freq / 2;
     26    const upperFreq = freq + 1000;
     27    const lowerMag = array[toneAnalyser.binIndexForFrequency(lowerFreq)];
     28    const freqMag = array[toneAnalyser.binIndexForFrequency(freq)];
     29    const upperMag = array[toneAnalyser.binIndexForFrequency(upperFreq)];
     30    info("Audio tone expected. "
     31         + lowerFreq + ": " + lowerMag + ", "
     32         + freq + ": " + freqMag + ", "
     33         + upperFreq + ": " + upperMag);
     34    return lowerMag < 50 && freqMag > 200 && upperMag < 50;
     35  });
     36 }
     37 
     38 let verifyNoAudioTone = async (ac, stream, freq) => {
     39  const toneAnalyser = new AudioStreamAnalyser(ac, stream);
     40  // repeat check 100 times to make sure that it is muted.
     41  let retryCnt = 0;
     42  return toneAnalyser.waitForAnalysisSuccess(array => {
     43    const lowerFreq = freq / 2;
     44    const upperFreq = freq + 1000;
     45    const lowerMag = array[toneAnalyser.binIndexForFrequency(lowerFreq)];
     46    const freqMag = array[toneAnalyser.binIndexForFrequency(freq)];
     47    const upperMag = array[toneAnalyser.binIndexForFrequency(upperFreq)];
     48    info("No audio tone expected. "
     49         + lowerFreq + ": " + lowerMag + ", "
     50         + freq + ": " + freqMag + ", "
     51         + upperFreq + ": " + upperMag);
     52    return lowerMag == 0 && freqMag == 0 && upperMag == 0 && ++retryCnt == 100;
     53  });
     54 }
     55 
     56 runTest(async () => {
     57  let audioDevice = SpecialPowers.getCharPref("media.audio_loopback_dev", "");
     58  if (!audioDevice) {
     59    todo(false, "No loopback device set by framework. Try --use-test-media-devices");
     60    return;
     61  }
     62 
     63  await pushPrefs(["media.setsinkid.enabled", true]);
     64 
     65  // Implicitly expose the loopback device sink by opening the source in the
     66  // same group.
     67  const verifyStream = await getUserMedia({audio: true});
     68 
     69  let sinkId = await getOutputDeviceId();
     70  isnot(sinkId, "", "SinkId is not null");
     71 
     72  let audioElement = createMediaElement('audio', 'audioElement');
     73  audioElement.muted = true;
     74  await audioElement.setSinkId(sinkId);
     75  isnot(audioElement.sinkId, "", "sinkId property of the element is not null");
     76 
     77  // The test stream is a sine tone of 1000 Hz
     78  let ac = new AudioContext();
     79  const frequency = 2000;
     80  let stream = createOscillatorStream(ac, frequency);
     81  await verifyAudioTone(ac, stream, frequency);
     82 
     83  audioElement.srcObject = stream;
     84  audioElement.play();
     85 
     86  // Verify the silent output using the loopback device.
     87  await verifyNoAudioTone(ac, verifyStream, frequency);
     88  info("output is muted");
     89 
     90  // Clean up
     91  audioElement.pause();
     92  audioElement.srcObject = null;
     93  verifyStream.getTracks()[0].stop();
     94 });
     95 </script>
     96 </pre>
     97 </body>
     98 </html>