third_party/WebKit/LayoutTests/webaudio/scriptprocessornode.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 type="text/javascript" src="resources/audio-testing.js"></script>
   7 </head>
   8
   9 <body>
  10
  11 <div id="description"></div>
  12 <div id="console"></div>
  13
  14 <script>
  15 description("Tests ScriptProcessorNode.");
  16
  17 var sampleRate = 44100.0;
  18 var outputChannels = 6;
  19 var playbackTime = 0.0;
  20
  21 // For the current implementation of ScriptProcessorNode, when it works with OfflineAudioContext (which runs much faster
  22 // than real-time) the event.inputBuffer might be overwrite again before onaudioprocess ever get chance to be called.
  23 // We carefully arrange the renderLengthInFrames and bufferSize to have exactly the same value to avoid this issue.
  24 var renderLengthInFrames = 512;
  25 var bufferSize = 512;
  26
  27 var context;
  28
  29 function createBuffer(context, length) {
  30     var audioBuffer = context.createBuffer(2, length, sampleRate);
  31     var n = audioBuffer.length;
  32     var dataL = audioBuffer.getChannelData(0);
  33     var dataR = audioBuffer.getChannelData(1);
  34
  35     for (var i = 0; i < n; ++i) {
  36         dataL[i] = -1;
  37         dataR[i] = 1;
  38     }
  39
  40     return audioBuffer;
  41 }
  42
  43 function processAudioData(event) {
  44     playbackTime = event.playbackTime;
  45     var expectedTime = context.currentTime + (bufferSize / context.sampleRate);
  46     var allowedTimeGap = 0.0000001;
  47
  48     // There may be a little time gap which is from different thread operation
  49     // between currentTime when main thread fires onaudioprocess() and currentTime when read in JS
  50     // since currentTime is continuously increasing on audio thread.
  51
  52     shouldBeCloseTo("playbackTime", expectedTime, allowedTimeGap, true);
  53
  54     buffer = event.outputBuffer;
  55     if (buffer.numberOfChannels != outputChannels)
  56         testFailed("numberOfOutputChannels doesn't match!");
  57
  58     if (buffer.length != bufferSize)
  59         testFailed("numberOfOutputChannels doesn't match!");
  60
  61     buffer = event.inputBuffer;
  62     var bufferDataL = buffer.getChannelData(0);
  63     var bufferDataR = buffer.getChannelData(1);
  64
  65     var success = true;
  66     // Go through every sample and make sure it's all -1 for the left-channel, and all +1 for the right-channel.
  67     for (var i = 0; i < buffer.length; ++i) {
  68         if (bufferDataL[i] != -1 || bufferDataR[i] != 1) {
  69             success = false;
  70             break;
  71         }
  72     }
  73
  74     if (success) {
  75         testPassed("onaudioprocess was called with correct data.");
  76     } else {
  77         testFailed("onaudioprocess was called with wrong data.");
  78     }
  79 }
  80
  81 function doBufferSizeTest(size) {
  82     try {
  83         var jsnode = context.createScriptProcessor(size, 1, 1);
  84         testPassed("Successfully created ScriptProcessorNode with bufferSize = " + size + ".");
  85     } catch(e) {
  86         testFailed("Failed to create ScriptProcessorNode with bufferSize = " + size + ".");
  87     }
  88 }
  89
  90 function runTest() {
  91     if (window.testRunner) {
  92         testRunner.dumpAsText();
  93         testRunner.waitUntilDone();
  94     }
  95
  96     window.jsTestIsAsync = true;
  97
  98     // Create offline audio context.
  99     context = new OfflineAudioContext(2, renderLengthInFrames, sampleRate);
 100
 101     try {
 102         var jsnode = context.createScriptProcessor(512, 0, 0);
 103         testFailed("Exception should be thrown when both numberOfInputChannels and numberOfOutputChannels are zero.");
 104     } catch(e) {
 105         testPassed("Exception was thrown when both numberOfInputChannels and numberOfOutputChannels are zero.");
 106     }
 107
 108     try {
 109         var jsnode = context.createScriptProcessor(512, 1, 0);
 110         testPassed("Successfully created ScriptProcessorNode with numberOfInputChannels = 1 and numberOfOutputChannels = 0.");
 111     } catch(e) {
 112         testFailed("Exception should not be thrown when numberOfInputChannels = 1 and numberOfOutputChannels = 0.");
 113     }
 114
 115     try {
 116         var jsnode = context.createScriptProcessor(512, 2, 0);
 117         testPassed("Successfully created ScriptProcessorNode with numberOfInputChannels = 2 and numberOfOutputChannels = 0.");
 118     } catch(e) {
 119         testFailed("Exception should not be thrown when numberOfInputChannels = 2 and numberOfOutputChannels = 0.");
 120     }
 121
 122     try {
 123         var jsnode = context.createScriptProcessor(512, 0, 1);
 124         testPassed("Successfully created ScriptProcessorNode with numberOfInputChannels = 0 and numberOfOutputChannels = 1.");
 125     } catch(e) {
 126         testFailed("Exception should not be thrown when numberOfInputChannels = 0 and numberOfOutputChannels = 1.");
 127     }
 128
 129     try {
 130         var jsnode = context.createScriptProcessor(512, 0, 2);
 131         testPassed("Successfully created ScriptProcessorNode with numberOfInputChannels = 0 and numberOfOutputChannels = 2.");
 132     } catch(e) {
 133         testFailed("Exception should not be thrown when numberOfInputChannels = 0 and numberOfOutputChannels = 2.");
 134     }
 135
 136     try {
 137         var jsnode = context.createScriptProcessor(511, 1, 1);
 138         testFailed("Exception should be thrown for illegal bufferSize.");
 139     } catch(e) {
 140         testPassed("Exception was thrown for illegal bufferSize.");
 141     }
 142
 143     doBufferSizeTest(256);
 144     doBufferSizeTest(512);
 145     doBufferSizeTest(1024);
 146     doBufferSizeTest(2048);
 147     doBufferSizeTest(4096);
 148     doBufferSizeTest(8192);
 149     doBufferSizeTest(16384);
 150
 151     var sourceBuffer = createBuffer(context, renderLengthInFrames);
 152
 153     var bufferSource = context.createBufferSource();
 154     bufferSource.buffer = sourceBuffer;
 155
 156     var jsnode = context.createScriptProcessor(bufferSize, 2, outputChannels);
 157
 158     bufferSource.connect(jsnode);
 159     jsnode.connect(context.destination);
 160     jsnode.onaudioprocess = processAudioData;
 161
 162     bufferSource.start(0);
 163     context.oncomplete = finishJSTest;
 164     context.startRendering();
 165 }
 166
 167 runTest();
 168
 169 </script>
 170
 171 </body>
 172 </html>