<!DOCTYPE HTML>
<html>
<head>
  <title>Test DynamicsCompressorNode</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 class="testbody" type="text/javascript">

function near(a, b, msg) {
  ok(Math.abs(a - b) < 1e-4, msg);
}

SimpleTest.waitForExplicitFinish();
addLoadEvent(function() {
  var context = new AudioContext();

  var osc = context.createOscillator();
  var sp = context.createScriptProcessor();

  var compressor = new DynamicsCompressorNode(context);

  osc.connect(compressor);
  osc.connect(sp);
  compressor.connect(context.destination);

  is(compressor.channelCount, 2, "compressor node has 2 input channels by default");
  is(compressor.channelCountMode, "clamped-max", "Correct channelCountMode for the compressor node");
  is(compressor.channelInterpretation, "speakers", "Correct channelCountInterpretation for the compressor node");

  // Verify default values
  ok(compressor.threshold instanceof AudioParam, "treshold is an AudioParam");
  near(compressor.threshold.defaultValue, -24, "Correct default value for threshold");
  ok(compressor.knee instanceof AudioParam, "knee is an AudioParam");
  near(compressor.knee.defaultValue, 30, "Correct default value for knee");
  ok(compressor.ratio instanceof AudioParam, "knee is an AudioParam");
  near(compressor.ratio.defaultValue, 12, "Correct default value for ratio");
  is(typeof compressor.reduction, "number", "reduction is a number");
  near(compressor.reduction, 0, "Correct default value for reduction");
  ok(compressor.attack instanceof AudioParam, "attack is an AudioParam");
  near(compressor.attack.defaultValue, 0.003, "Correct default value for attack");
  ok(compressor.release instanceof AudioParam, "release is an AudioParam");
  near(compressor.release.defaultValue, 0.25, "Correct default value for release");

  compressor.threshold.value = -80;

  osc.start();
  var iteration = 0;
  sp.onaudioprocess = function(e) {
    if (iteration > 10) {
      ok(compressor.reduction < 0,
         "Feeding a full-scale sine to a compressor should result in an db" +
         "reduction.");
      sp.onaudioprocess = null;
      osc.stop(0);

      SimpleTest.finish();
    }
    iteration++;
  }
});

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