third_party/WebKit/LayoutTests/webaudio/dynamicscompressor-clear-internal-state.html

   1 <!doctype html>
   2 <html>
   3   <head>
   4     <title>Validate Reduction Value of DynamicsComporessor after Disabling</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("Validate Reduction Value of DynamicsComporessor after Disabling");
  13
  14       var context;
  15       var buffer;
  16       var source;
  17       var compressor;
  18       var renderedData;
  19
  20       var sampleRate = 44100;
  21       var testDurationSamples = 44100;
  22
  23       function checkResult (event) {
  24
  25           renderedData = event.renderedBuffer.getChannelData(0);
  26
  27           // Check that the reduction value is 0.0.
  28           if (compressor.reduction.value !== 0.0) {
  29               testFailed("Expected reduction of 0.0, but the value is " + compressor.reduction.value);
  30           }
  31           else {
  32               testPassed("Reduction is 0.0");
  33           }
  34
  35           finishJSTest();
  36       }
  37
  38       function runTest() {
  39           window.jsTestIsAsync = true;
  40
  41           // Create the offline context for the test.
  42           context = new OfflineAudioContext(1, testDurationSamples, sampleRate);
  43           context.oncomplete = checkResult;
  44
  45           // Create the constant sample buffer of 0.5 sec.
  46           buffer = createConstantBuffer(context, testDurationSamples / 2, 1);
  47
  48           // Create compressor and use default parameters for the compression.
  49           compressor = context.createDynamicsCompressor();
  50
  51           // Create the source and connect it to the destination
  52           source = context.createBufferSource();
  53           source.buffer = buffer;
  54           source.connect(compressor);
  55           compressor.connect(context.destination);
  56           source.start(0.0);
  57
  58           // Render it!
  59           context.startRendering();
  60       }
  61
  62       runTest();
  63       succesfullyParsed = true;
  64     </script>
  65   </body>
  66 </html>