third_party/WebKit/LayoutTests/webaudio/mixing.html

   1 <!DOCTYPE html>
   2
   3 <!--
   4 Create two sources and play them simultaneously.  This tests unity-gain summing of AudioNode inputs.
   5 The result should be some laughing playing at the same time as the drumming.
   6 -->
   7
   8 <html>
   9 <head>
  10 <script type="text/javascript" src="resources/audio-testing.js"></script>
  11 <script type="text/javascript" src="resources/buffer-loader.js"></script>
  12
  13 </head>
  14 <body>
  15
  16 <script>
  17
  18 window.onload = init;
  19
  20 var sampleRate = 44100.0;
  21 var lengthInSeconds = 2;
  22
  23 var context = 0;
  24 var bufferLoader = 0;
  25
  26 function init() {
  27     if (!window.testRunner)
  28         return;
  29
  30     // Create offline audio context.
  31     context = new OfflineAudioContext(2, sampleRate * lengthInSeconds, sampleRate);
  32
  33     bufferLoader = new BufferLoader(
  34         context,
  35         [
  36         "resources/hyper-reality/br-jam-loop.wav",
  37         "resources/hyper-reality/laughter.wav",
  38         ],
  39         finishedLoading
  40     );
  41
  42     bufferLoader.load();
  43     testRunner.waitUntilDone();
  44 }
  45
  46 function finishedLoading(bufferList) {
  47     // Create two sources and play them at the same time.
  48     var source1 = context.createBufferSource();
  49     var source2 = context.createBufferSource();
  50     source1.buffer = bufferList[0];
  51     source2.buffer = bufferList[1];
  52
  53     source1.connect(context.destination);
  54     source2.connect(context.destination);
  55     source1.start(0);
  56     source2.start(0);
  57
  58     context.oncomplete = finishAudioTest;
  59     context.startRendering();
  60 }
  61
  62 </script>
  63
  64 </body>
  65 </html>