dom/media/webaudio/test/test_decodeMultichannel.html


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<!DOCTYPE HTML>
<html>
<meta charset=utf-8>
<head>
  <title>Test that we can decode 4 channel wave file in webaudio, but not in &lt;audio&gt;</title>
  <script type="text/javascript" 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">
var filename = "audio-quad.wav";

SimpleTest.waitForExplicitFinish();

function finishTest(a) {
  if (a) {
    a = null;
    SimpleTest.finish();
  }
}

function decodeUsingAudioElement() {
  var a = new Audio();
  a.addEventListener("error", function() {
    ok(false, "Error loading metadata");
    finishTest(a);
  });
  a.addEventListener("loadedmetadata", function() {
    ok(true, "Metadata Loaded");
    finishTest(a);
  });

  a.src = filename;
  a.load();
}

addLoadEvent(function() {
  var xhr = new XMLHttpRequest();
  xhr.open("GET", filename);
  xhr.responseType = "arraybuffer";
  xhr.onload = function() {
    var context = new AudioContext();
    context.decodeAudioData(xhr.response, function(b) {
      ok(true, "Decoding of a wave file with four channels succeded.");
      is(b.numberOfChannels, 4, "The AudioBuffer should have 4 channels.");
      decodeUsingAudioElement();
    }, function() {
      ok(false, "Decoding of a wave file with four channels failed.");
      decodeUsingAudioElement();
    });
  };
  xhr.send(null);
});
</script>
</pre>
</body>
</html>