<!DOCTYPE HTML>
<html>
<head>
  <title>Test AudioParam.linearRampToValue</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 T0 = 0;

var gTest = {
  length: 2048,
  numberOfChannels: 1,
  createGraph(context) {
    var source = context.createConstantSource();

    var gain = context.createGain();
    gain.gain.setValueCurveAtTime(this.curve, T0, this.duration);
    source.connect(gain);

    source.start(0);
    return gain;
  },
  createExpectedBuffers(context) {
    this.duration = 1024 / context.sampleRate;
    this.curve = new Float32Array([1.0, 0.5, 0.75, 0.25]);
    var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate);
    var data = expectedBuffer.getChannelData(0);
    var step = 1024 / 3;
    for (var i = 0; i < 2048; ++i) {
      if (i < step) {
        data[i] = 1.0 - 0.5*i/step;
      } else if (i < 2*step) {
        data[i] = 0.5 + 0.25*(i - step)/step;
      } else if (i < 3*step) {
        data[i] = 0.75 - 0.5*(i - 2*step)/step;
      } else {
        data[i] = 0.25;
      }
    }
    return expectedBuffer;
  },
};

runTest();

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