<!DOCTYPE HTML>
<html>
<head>
  <title>Test AudioParam.setTargetAtTime where the target time is the same as the time of a previous event</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">

var V0 = 0.9;
var V1 = 0.1;
var T0 = 0;
var TimeConstant = 0.1;

var gTest = {
  length: 2048,
  numberOfChannels: 1,
  createGraph(context) {
    var sourceBuffer = context.createBuffer(1, 2048, context.sampleRate);
    for (var i = 0; i < 2048; ++i) {
      sourceBuffer.getChannelData(0)[i] = 1;
    }

    var source = context.createBufferSource();
    source.buffer = sourceBuffer;

    var gain = context.createGain();
    gain.gain.setValueAtTime(V0, T0);
    gain.gain.setTargetAtTime(V1, T0, TimeConstant);

    source.connect(gain);

    source.start(0);
    return gain;
  },
  createExpectedBuffers(context) {
    var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate);
    for (var i = 0; i < 2048; ++i) {
      var t = i / context.sampleRate;
      expectedBuffer.getChannelData(0)[i] = V1 + (V0 - V1) * Math.exp(-(t - T0) / TimeConstant);
    }
    return expectedBuffer;
  },
};

SimpleTest.waitForExplicitFinish();
// Comparing different AudioContexts may result in different timing reated information being reported
// when we jitter time, as they are on different Relative Timelines.
SpecialPowers.pushPrefEnv({"set": [["privacy.resistFingerprinting.reduceTimerPrecision.jitter", false]]}, runTest);


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