<!DOCTYPE HTML>
<html>
<head>
  <title>Test AnalyserNode when the input is silent</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();
addLoadEvent(function() {

  var ac = new AudioContext();
  var analyser = ac.createAnalyser();
  var constant = ac.createConstantSource();
  var sp = ac.createScriptProcessor(2048, 1, 0);

  constant.offset.value = 0.0;

  constant.connect(analyser)
          .connect(ac.destination);

  constant.connect(sp);

  var buf = new Float32Array(analyser.frequencyBinCount);
  var iteration_count = 10;
  sp.onaudioprocess = function() {
    analyser.getFloatFrequencyData(buf);
    var correct = true;
    for (var i = 0; i < buf.length; i++) {
     correct &= buf[i] == -Infinity;
    }
    ok(correct, "silent input process -Infinity in decibel bins");
    if(!(iteration_count--)) {
      sp.onaudioprocess = null;
      constant.stop();
      ac.close();
      SimpleTest.finish();
    }
  }

  constant.start();
});

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