LayoutTests/webaudio/stereo2mono-down-mixing.html

   1 <!DOCTYPE html>
   2
   3 <html>
   4 <head>
   5 <script src="../fast/js/resources/js-test-pre.js"></script>
   6 <script src="resources/audio-testing.js"></script>
   7 </head>
   8
   9 <body>
  10
  11 <div id="description"></div>
  12 <div id="console"></div>
  13
  14 <script>
  15 description("This test verifies whether down mixing from stereo to mono will cause assertion error.");
  16
  17 var sampleRate = 44100.0;
  18 var renderLengthSeconds = 0.1;
  19
  20 var context;
  21 var toneBuffer;
  22 var bufferSource;
  23
  24 function createDataBuffer(context, lengthInSeconds) {
  25     var audioBuffer = context.createBuffer(2, lengthInSeconds * sampleRate, sampleRate);
  26
  27     var n = audioBuffer.length;
  28     var data0 = audioBuffer.getChannelData(0);
  29     var data1 = audioBuffer.getChannelData(1);
  30
  31     for (var i = 0; i < n; ++i) {
  32         data0[i] = 1.0;
  33         data1[i] = 1.0;
  34     }
  35
  36     return audioBuffer;
  37 }
  38
  39 function testFinished() {
  40     testPassed("Test no ASSERT error.");
  41     finishJSTest();
  42 }
  43
  44 function runTest() {
  45     if (window.testRunner) {
  46         testRunner.dumpAsText();
  47         testRunner.waitUntilDone();
  48     }
  49
  50     window.jsTestIsAsync = true;
  51
  52     // Create offline audio context, the destination is mono.
  53     context = new webkitOfflineAudioContext(1, sampleRate * renderLengthSeconds, sampleRate);
  54     // Create a stereo AudioBuffer.
  55     toneBuffer = createDataBuffer(context, renderLengthSeconds);
  56
  57     bufferSource = context.createBufferSource();
  58     bufferSource.buffer = toneBuffer;
  59
  60     bufferSource.connect(context.destination);
  61
  62     bufferSource.noteOn(0);
  63
  64     context.oncomplete = testFinished;
  65     context.startRendering();
  66 }
  67
  68
  69 runTest();
  70
  71 </script>
  72
  73 <script src="../fast/js/resources/js-test-post.js"></script>
  74 </body>
  75 </html>