dom/media/webaudio/test/test_oscillatorNode2.html
author Ting-Yu Lin <tlin@mozilla.com>
Sat, 01 Apr 2023 04:17:05 +0000
changeset 658805 7437637d0b5c2745440bfeba4adb64689d24044f
parent 491143 3b3c5e0e1bc4a58d8a7d5718745cc41153e06a76
permissions -rw-r--r--
Bug 1055894 - Add GetLogicalNormalRect() and adapt some callers of GetNormalRect(). r=emilio This patch makes the API nicer, and shouldn't change the behavior. Differential Revision: https://phabricator.services.mozilla.com/D174344

<!DOCTYPE HTML>
<html>
<head>
  <title>Test OscillatorNode lifetime and sine phase</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<pre id="test">
<script src="webaudio.js" type="text/javascript"></script>
<script class="testbody" type="text/javascript">

const signalLength = 2048;

function createOscillator(context) {
  var osc = context.createOscillator();
  osc.start(0);
  osc.stop(signalLength/context.sampleRate);
  return osc;
}

function connectUnreferencedOscillator(context, destination) {
  var osc = createOscillator(context);
  osc.connect(destination);
}

var gTest = {
  length: signalLength,
  numberOfChannels: 1,
  createGraph(context) {
    var blend = context.createGain();

    connectUnreferencedOscillator(context, blend);
    // Test that the unreferenced oscillator remains alive until it has finished.
    SpecialPowers.forceGC();
    SpecialPowers.forceCC();

    // Create another sine wave oscillator in negative time, which should
    // cancel when mixed with the unreferenced oscillator.
    var oscillator = createOscillator(context);
    oscillator.frequency.value = -440;
    oscillator.connect(blend);

    return blend;
  },
};

runTest();

</script>
</pre>
</body>
</html>