test_biquadFilterNode.html

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<head>

  <title>Test BiquadFilterNode</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">

function near(a, b, msg) {

  ok(Math.abs(a - b) < 1e-3, msg);

SimpleTest.waitForExplicitFinish();

addLoadEvent(function() {

  var context = new AudioContext();

  var buffer = context.createBuffer(1, 2048, context.sampleRate);

  for (var i = 0; i < 2048; ++i) {

    buffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);

  var destination = context.destination;

  var source = context.createBufferSource();

  var filter = context.createBiquadFilter();

  source.buffer = buffer;

  source.connect(filter);

  filter.connect(destination);

  // Verify default values

  is(filter.type, "lowpass", "Correct default value for type");

  near(filter.frequency.defaultValue, 350, "Correct default value for filter frequency");

  near(filter.detune.defaultValue, 0, "Correct default value for filter detune");

  near(filter.Q.defaultValue, 1, "Correct default value for filter Q");

  near(filter.gain.defaultValue, 0, "Correct default value for filter gain");

  is(filter.channelCount, 2, "Biquad filter node has 2 input channels by default");

  is(filter.channelCountMode, "max", "Correct channelCountMode for the biquad filter node");

  is(filter.channelInterpretation, "speakers", "Correct channelCountInterpretation for the biquad filter node");

  // Make sure that we can set all of the valid type values

  var types = [

    "lowpass",

    "highpass",

    "bandpass",

    "lowshelf",

    "highshelf",

    "peaking",

    "notch",

    "allpass",

];

  for (var i = 0; i < types.length; ++i) {

    filter.type = types[i];

  // Make sure getFrequencyResponse handles invalid frequencies properly

  var frequencies = new Float32Array([-1.0, context.sampleRate*0.5 - 1.0, context.sampleRate]);

  var magResults = new Float32Array(3);

  var phaseResults = new Float32Array(3);

  filter.getFrequencyResponse(frequencies, magResults, phaseResults);

  ok(isNaN(magResults[0]), "Invalid input frequency should give NaN magnitude response");

  ok(!isNaN(magResults[1]), "Valid input frequency should not give NaN magnitude response");

  ok(isNaN(magResults[2]), "Invalid input frequency should give NaN magnitude response");

  ok(isNaN(phaseResults[0]), "Invalid input frquency should give NaN phase response");

  ok(!isNaN(phaseResults[1]), "Valid input frquency should not give NaN phase response");

  ok(isNaN(phaseResults[2]), "Invalid input frquency should give NaN phase response");

  source.start(0);

  SimpleTest.executeSoon(function() {

    source.stop(0);

    source.disconnect();

    filter.disconnect();

    SimpleTest.finish();

});

});

</script>

</pre>

</body>

</html>