third_party/WebKit/LayoutTests/webaudio/panner-loop.html

   1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
   2 <html>
   3   <head>
   4     <script src="resources/compatibility.js"></script>
   5     <script src="resources/audio-testing.js"></script>
   6     <script src="../resources/js-test.js"></script>
   7     <script src="resources/panner-model-testing.js"></script>
   8   </head>
   9
  10   <body>
  11     <div id="description"></div>
  12     <div id="console"></div>
  13     <script>
  14       description("Test PannerNode handling of feedback loops");
  15
  16       // See crbug.com/331446.
  17
  18       // Create a simple feedback loop and make sure the panner node processes it correctly.
  19
  20       function runTest() {
  21           if (window.testRunner) {
  22               testRunner.dumpAsText();
  23               testRunner.waitUntilDone();
  24           }
  25
  26           window.jsTestIsAsync = true;
  27
  28           var sampleRate = 44100;
  29           var renderLengthSeconds = 1;
  30
  31           // Create offline audio context.
  32           var context = new OfflineAudioContext(2, sampleRate * renderLengthSeconds, sampleRate);
  33
  34           // Create nodes in graph. This is based on the test given in crbug.com/331446.
  35           var source = context.createBufferSource();
  36           source.buffer = createImpulseBuffer(context, sampleRate * renderLengthSeconds);
  37           var activateNode = context.createGain();
  38           var dry = context.createGain();
  39           var wet = context.createGain();
  40           var filter = context.createBiquadFilter();
  41           var delay = context.createDelay();
  42           var feedbackNode = context.createGain();
  43           var output = context.createGain();
  44
  45           delay.delayTime.value = 0.1;
  46           wet.gain.value = 0.5;
  47           dry.gain.value = 1;
  48           feedbackNode.gain.value = 0.45;
  49           filter.frequency.value = 20000;
  50
  51           source.connect(activateNode);
  52           activateNode.connect(delay);
  53           activateNode.connect(dry);
  54           delay.connect(filter);
  55           filter.connect(feedbackNode);
  56           feedbackNode.connect(delay);
  57           feedbackNode.connect(wet);
  58           wet.connect(output);
  59           dry.connect(output);
  60
  61           var panner = context.createPanner();
  62           panner.coneOuterGain = 0.1;
  63           panner.coneOuterAngle = 180;
  64           panner.coneInnerAngle = 0;
  65
  66           panner.connect(context.destination);
  67
  68           output.connect(panner);
  69
  70           // Render.  We don't care what the output is, though.
  71
  72           context.oncomplete = function (event) {
  73                                    testPassed("Rendering successfully completed.");
  74                                    finishJSTest();
  75                                };
  76           context.startRendering();
  77       }
  78
  79       runTest();
  80       successfullyParsed = true;
  81     </script>
  82
  83   </body>
  84 </html>