test_mediaElementAudioSourceNodePassThrough.html

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<meta charset="utf-8">

<head>

  <title>Test MediaElementAudioSourceNode with passthrough</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

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<body>

<pre id="test">

<script class="testbody" type="text/javascript">

SimpleTest.waitForExplicitFinish();

function test() {

  var audio = new Audio("small-shot.ogg");

  var context = new AudioContext();

  var node = context.createMediaElementSource(audio);

  var sp = context.createScriptProcessor(2048, 1);

  node.connect(sp);

  var nonzeroSampleCount = 0;

  var complete = false;

  var iterationCount = 0;

  var srcWrapped = SpecialPowers.wrap(node);

  ok("passThrough" in srcWrapped, "MediaElementAudioSourceNode should support the passThrough API");

  srcWrapped.passThrough = true;

  // This test ensures we receive at least expectedSampleCount nonzero samples

  function processSamples(e) {

    if (complete) {

      return;

    if (iterationCount == 0) {

      // Don't start playing the audio until the AudioContext stuff is connected

      // and running.

      audio.play();

    ++iterationCount;

    var buf = e.inputBuffer.getChannelData(0);

    var nonzeroSamplesThisBuffer = 0;

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

      if (buf[i] != 0) {

        ++nonzeroSamplesThisBuffer;

    nonzeroSampleCount += nonzeroSamplesThisBuffer;

    if (iterationCount == 10) {

      is(nonzeroSampleCount, 0, "The input must be silence");

      SimpleTest.finish();

      complete = true;

  audio.oncanplaythrough = function() {

    sp.onaudioprocess = processSamples;

};

SpecialPowers.pushPrefEnv({"set": [["media.preload.default", 2], ["media.preload.auto", 3]]}, test);

</script>

</pre>

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