third_party/WebKit/LayoutTests/webaudio/audiobuffersource-one-sample-loop.html

   1 <!doctype html>
   2 <html>
   3   <head>
   4     <title>Test AudioBufferSourceNode With Looping a Single-Sample Buffer</title>
   5     <script src="resources/compatibility.js"></script>
   6     <script src="resources/audio-testing.js"></script>
   7     <script src="../resources/js-test.js"></script>
   8   </head>
   9
  10   <body>
  11     <script>
  12       description("Test AudioBufferSourceNode With Looping a Single-Sample Buffer");
  13
  14       var context;
  15       var source;
  16       var buffer;
  17       var renderedData;
  18
  19       var sampleRate = 44100;
  20       var testDurationSamples = 1000;
  21
  22       function checkResult (event) {
  23           var success = true;
  24
  25           renderedData = event.renderedBuffer.getChannelData(0);
  26           // Check that the rendered data is all ones, like the buffer source.
  27           for (k = 0; k < renderedData.length; ++k) {
  28               if (renderedData[k] != 1) {
  29                   success = false;
  30                   testFailed("Expected all ones, but sample " + k + " is " + renderedData[k]);
  31                   break;
  32               }
  33           }
  34           if (success)
  35               testPassed("All samples equal to 1");
  36           finishJSTest();
  37       }
  38
  39       function runTest() {
  40           window.jsTestIsAsync = true;
  41
  42           // Create the offline context for the test.
  43           context = new OfflineAudioContext(1, testDurationSamples, sampleRate);
  44           context.oncomplete = checkResult;
  45
  46           // Create the single sample buffer
  47           buffer = createConstantBuffer(context, 1, 1);
  48
  49           // Create the source and connect it to the destination
  50           source = context.createBufferSource();
  51           source.buffer = buffer;
  52           source.loop = true;
  53           source.connect(context.destination);
  54           source.start();
  55
  56           // Render it!
  57           context.startRendering();
  58       }
  59
  60       runTest();
  61       succesfullyParsed = true;
  62     </script>
  63   </body>
  64 </html>