third_party/WebKit/LayoutTests/webaudio/automatic-pull-node.html

   1 <!DOCTYPE html>
   2
   3 <html>
   4 <head>
   5 <script src="../resources/js-test.js"></script>
   6 <script src="resources/compatibility.js"></script>
   7 <script type="text/javascript" src="resources/audio-testing.js"></script>
   8 </head>
   9
  10 <body>
  11
  12 <div id="description"></div>
  13 <div id="console"></div>
  14
  15 <script>
  16 description("This test verifies that the AudioBasicInspectorNode based nodes work correctly.");
  17
  18 var sampleRate = 44100.0;
  19 // We carefully arrange the renderLengthInFrames to be a multiple of the AudioNode rendering quantum (AudioNode::ProcessingSizeInFrames)
  20 // so that AudioSourceNode will not feed tailing zeroes into the context and fail this test.
  21 var renderLengthInFrames = 256;
  22 var fftSize = 64;
  23
  24 var audioDataOne = 255; // Audio data 1.0 in Uint8 format will be 255.
  25 var audioDataZero = 128; // Audio data 0 in Uint8 format will be 128.
  26
  27 var context;
  28 var constantBuffer;
  29 var bufferSource;
  30 var analyser;
  31
  32 function constructCommonGraph() {
  33     // Create offline audio context.
  34     context = new OfflineAudioContext(1, renderLengthInFrames, sampleRate);
  35     constantBuffer = createConstantBuffer(context, renderLengthInFrames, 1);
  36
  37     bufferSource = context.createBufferSource();
  38     bufferSource.buffer = constantBuffer;
  39
  40     analyser = context.createAnalyser();
  41     analyser.fftSize = fftSize;
  42
  43     bufferSource.connect(analyser);
  44 }
  45
  46 function test1Finished() {
  47     var timeDomainData = new Uint8Array(fftSize);
  48     analyser.getByteTimeDomainData(timeDomainData);
  49
  50     if (timeDomainData[0] >= audioDataOne)
  51         testPassed("RealtimeAnalyserNode got pulled when connected from upstream node but not to downstream node.");
  52     else
  53         testFailed("RealtimeAnalyserNode failed to get pulled when connected from upstream node but not to downstream node.");
  54
  55     test2();
  56 }
  57
  58 // To verify the realtimeAnalyser can pull data when there is an upstream node connected to it
  59 // but it's not connected to a downstream node.
  60 function test1() {
  61     constructCommonGraph();
  62
  63     bufferSource.start(0);
  64
  65     context.oncomplete = test1Finished;
  66     context.startRendering();
  67 }
  68
  69 function test2Finished() {
  70     var timeDomainData = new Uint8Array(fftSize);
  71     analyser.getByteTimeDomainData(timeDomainData);
  72
  73     if (timeDomainData[0] >= audioDataOne)
  74         testPassed("RealtimeAnalyserNode got pulled when connected from upstream node and to destination node.");
  75     else
  76         testFailed("RealtimeAnalyserNode failed to be pulled when connected by upstream node and to destination node.");
  77
  78     test3();
  79 }
  80
  81 // To verify the realtimeAnalyser can process normally when there is an upstream node connected to it
  82 // and it's also connected to a downstream node which ultimately connect to audio destination.
  83 function test2() {
  84     constructCommonGraph();
  85
  86     analyser.connect(context.destination);
  87
  88     bufferSource.start(0);
  89
  90     context.oncomplete = test2Finished;
  91     context.startRendering();
  92 }
  93
  94 function test3Finished() {
  95     var timeDomainData = new Uint8Array(fftSize);
  96     analyser.getByteTimeDomainData(timeDomainData);
  97
  98     // If realtimeAnalyser hasn't pulled any data, the data in buffer will be 0.
  99     if (timeDomainData[0] == audioDataZero)
 100         testPassed("RealtimeAnalyserNode didn't get pulled when it should not.");
 101     else
 102         testFailed("RealtimeAnalyserNode been pulled when it should not.");
 103
 104     finishJSTest();
 105 }
 106
 107 // To verify the realtimeAnalyser will stop pulling if it is connected to a downstream node
 108 // which is not ultimatly connected to any audio destination.
 109 function test3() {
 110     constructCommonGraph();
 111
 112     var gain = context.createGain();
 113     analyser.connect(gain);
 114
 115     bufferSource.start(0);
 116
 117     context.oncomplete = test3Finished;
 118     context.startRendering();
 119 }
 120
 121 function runTest() {
 122     if (window.testRunner) {
 123         testRunner.dumpAsText();
 124         testRunner.waitUntilDone();
 125     }
 126
 127     window.jsTestIsAsync = true;
 128
 129     test1();
 130 }
 131
 132 runTest();
 133
 134 </script>
 135
 136 </body>
 137 </html>