third_party/WebKit/LayoutTests/webaudio/offlineaudiocontext-promise.html

   1 <!doctype html>
   2 <html>
   3   <head>
   4     <script src="../resources/js-test.js"></script>
   5     <script src="resources/compatibility.js"></script>
   6     <script src="resources/audio-testing.js"></script>
   7     <title>OfflineAudioContext.startRendering Promise with oncomplete</title>
   8   </head>
   9
  10   <body>
  11     <script>
  12       description("Test OfflineAudioContext.startRendering Promise with oncomplete");
  13
  14       var context;
  15       var promise;
  16       var renderedData;
  17       var promiseData;
  18
  19       var sampleRate = 48000;
  20       var renderSeconds = 1;
  21       var renderFrames = sampleRate * renderSeconds;
  22       var contextChannels = 2;
  23
  24       function compareData() {
  25         // The spec implies that the same buffer is returned by both oncomplete and the promise.
  26         // Check that they are identical.
  27         if (renderedData === promiseData) {
  28           testPassed("AudioBuffer returned by oncomplete and promise are identical");
  29         } else {
  30           testFailed("AudioBuffer returned by oncomplete and promise are NOT identical");
  31         }
  32         finishJSTest();
  33       }
  34
  35       function checkResult (event) {
  36         renderedData = event.renderedBuffer;
  37         promise.then(function (result) {
  38           promiseData = result;
  39           compareData();
  40         });
  41       }
  42
  43       // Create an offline context and verify that both the oncomplete and promise are returned with
  44       // the same stuff.
  45       function runTest() {
  46         window.jsTestIsAsync = true;
  47
  48         context = new OfflineAudioContext(contextChannels, renderFrames, sampleRate);
  49
  50         var buffer = context.createBuffer(contextChannels, renderFrames, sampleRate);
  51         for (var k = 0; k < renderFrames; ++k) {
  52           buffer.getChannelData(0)[k] = 1;
  53           buffer.getChannelData(1)[k] = 2;
  54         }
  55
  56         var source = context.createBufferSource();
  57         source.buffer = buffer;
  58         source.connect(context.destination);
  59         source.start();
  60
  61         context.oncomplete = checkResult;
  62
  63         promise = context.startRendering();
  64
  65       }
  66
  67       runTest();
  68       successfullyParsed = true;
  69     </script>
  70
  71   </body>
  72 </html>