test_pannerNode_audioparam_distance.html

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<head>

  <title>Distance effect of a PannerNode with the position set via AudioParams (Bug 1472550)</title>

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

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

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

</head>

<body>

<pre id="test">

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

 SimpleTest.waitForExplicitFinish();

 var o = new OfflineAudioContext(2, 256, 44100);

 // We want a stereo constant source.

 var b = o.createBuffer(2, 1, 44100);

 b.getChannelData(0)[0] = 1;

 b.getChannelData(1)[0] = 1;

 var c = o.createBufferSource();

 c.buffer = b;

 c.loop = true;

 var p = o.createPanner();

 p.positionY.setValueAtTime(1, 0);

 p.positionX.setValueAtTime(1, 0);

 p.positionZ.setValueAtTime(1, 0);

 // Set the listener somewhere far

 o.listener.setPosition(20, 2, 20);

 c.start();

 c.connect(p).connect(o.destination);

 o.startRendering().then((ab) => {

   // Check that the distance attenuates the sound.

   ok(ab.getChannelData(0)[0] < 0.1, "left channel must be very quiet");

   ok(ab.getChannelData(1)[0] < 0.1, "right channel must be very quiet");

   SimpleTest.finish();

});

</script>

</pre>

</body>

</html>