test_defaultAudioConstraints.html

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<!DOCTYPE HTML>

<html>

<head>

  <script type="application/javascript" src="mediaStreamPlayback.js"></script>

</head>

<body>

<pre id="test">

<script type="application/javascript">

"use strict";

createHTML({

  title: "Test that the audio constraints that observe at the audio constraints we expect.",

  bug: "1509842"

});

runTest(async () => {

  // We need a real device to get a MediaEngine supporting constraints

  let audioDevice = SpecialPowers.getCharPref("media.audio_loopback_dev", "");

  if (!audioDevice) {

    todo(false, "No device set by framework. Try --use-test-media-devices");

    return;

  // Get a gUM track with the default settings, check that they are what we

  // expect.

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

  let track = stream.getAudioTracks()[0];

  let defaultSettings = track.getSettings();

  is(defaultSettings.echoCancellation, true,

      "Echo cancellation should be ON by default.");

  is(defaultSettings.noiseSuppression, true,

      "Noise suppression should be ON by default.");

  is(defaultSettings.autoGainControl, true,

      "Automatic gain control should be ON by default.");

  track.stop();

  // This is UA-dependant, and belongs in a Mochitest, not in a WPT.

  // When a gUM track has been requested with `echoCancellation` OFF, check that

  // `noiseSuppression` and `autoGainControl` are off as well.

  stream =

    await navigator.mediaDevices.getUserMedia({audio:{echoCancellation: false}});

  track = stream.getAudioTracks()[0];

  defaultSettings = track.getSettings();

  is(defaultSettings.echoCancellation, false,

      "Echo cancellation should be OFF when requested.");

  is(defaultSettings.noiseSuppression, false,

      `Noise suppression should be OFF when echoCancellation is the only

      constraint and is OFF.`);

  is(defaultSettings.autoGainControl, false,

      `Automatic gain control should be OFF when echoCancellation is the only

      constraint and is OFF.`);

  track.stop();

  // When a gUM track has been requested with `echoCancellation` OFF, check that

  // `noiseSuppression` and `autoGainControl` are not OFF as well if another

  // constraint has been specified.

  stream =

    await navigator.mediaDevices.getUserMedia({audio:{echoCancellation: false,

                                                      autoGainControl: true}});

  track = stream.getAudioTracks()[0];

  defaultSettings = track.getSettings();

  is(defaultSettings.echoCancellation, false,

      "Echo cancellation should be OFF when requested.");

  is(defaultSettings.noiseSuppression, false,

      `Noise suppression should be OFF when echoCancellation is OFF and another

      constraint has been specified.`);

  is(defaultSettings.autoGainControl, true,

      "Auto gain control should be ON when requested.");

  track.stop();

});

</script>

</pre>

</body>

</html>