third_party/WebKit/LayoutTests/webaudio/stereo2mono-down-mixing.html

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