dom/media/webaudio/test/test_pannerNodeAtZeroDistance.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <head>
   4   <title>Test PannerNode produces output even when the even when the distance is from the listener is zero</title>
   5   <script src="/tests/SimpleTest/SimpleTest.js"></script>
   6   <script type="text/javascript" src="webaudio.js"></script>
   7   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
   8 </head>
   9 <body>
  10 <pre id="test">
  11 <script class="testbody" type="text/javascript">
  12
  13 var BUF_SIZE = 128;
  14
  15 var types = [
  16   "equalpower",
  17   "HRTF"
  18 ]
  19
  20 async function testMono(type) {
  21   var ac = new OfflineAudioContext(1, BUF_SIZE, 44100);
  22
  23   // A sine to be used to fill the buffers
  24   function sine(t) {
  25     return Math.sin(440 * 2 * Math.PI * t / ac.sampleRate);
  26   }
  27
  28   var monoBuffer = ac.createBuffer(1, BUF_SIZE, ac.sampleRate);
  29   for (var i = 0; i < BUF_SIZE; ++i) {
  30     monoBuffer.getChannelData(0)[i] = sine(i);
  31   }
  32
  33   var monoSource = ac.createBufferSource();
  34   monoSource.buffer = monoBuffer;
  35   monoSource.start(0);
  36
  37   var panner = ac.createPanner();
  38   panner.distanceModel = "linear";
  39   monoSource.connect(panner);
  40
  41   var panner2 = ac.createPanner();
  42   panner2.distanceModel = "inverse";
  43   panner.connect(panner2);
  44
  45   var panner3 = ac.createPanner();
  46   panner3.distanceModel = "exponential";
  47   panner2.connect(panner3);
  48
  49   panner3.connect(ac.destination);
  50
  51   // Use the input buffer to compare the output. According to the spec,
  52   // mono input at zero distance will apply gain = cos(0.5 * Math.PI / 2)
  53   // https://webaudio.github.io/web-audio-api/#Spatialzation-equal-power-panning
  54   const gain = Math.cos(0.5 * Math.PI / 2);
  55   for (var i = 0; i < BUF_SIZE; ++i) {
  56     monoBuffer.getChannelData(0)[i] = gain * monoBuffer.getChannelData(0)[i];
  57   }
  58
  59   const buffer = await ac.startRendering();
  60   compareBuffers(buffer, monoBuffer);
  61 }
  62
  63 async function testStereo(type) {
  64   var ac = new OfflineAudioContext(2, BUF_SIZE, 44100);
  65
  66   // A sine to be used to fill the buffers
  67   function sine(t) {
  68     return Math.sin(440 * 2 * Math.PI * t / ac.sampleRate);
  69   }
  70
  71   var stereoBuffer = ac.createBuffer(2, BUF_SIZE, ac.sampleRate);
  72   for (var i = 0; i < BUF_SIZE; ++i) {
  73     stereoBuffer.getChannelData(0)[i] = sine(i);
  74     stereoBuffer.getChannelData(1)[i] = sine(i);
  75   }
  76
  77   var stereoSource = ac.createBufferSource();
  78   stereoSource.buffer = stereoBuffer;
  79   stereoSource.start(0);
  80
  81   var panner = ac.createPanner();
  82   panner.distanceModel = "linear";
  83   stereoSource.connect(panner);
  84
  85   var panner2 = ac.createPanner();
  86   panner2.distanceModel = "inverse";
  87   panner.connect(panner2);
  88
  89   var panner3 = ac.createPanner();
  90   panner3.distanceModel = "exponential";
  91   panner2.connect(panner3);
  92
  93   panner3.connect(ac.destination);
  94
  95   const buffer = await ac.startRendering();
  96   compareBuffers(buffer, stereoBuffer);
  97 }
  98
  99 async function test(type) {
 100   await testMono(type)
 101   await testStereo(type);
 102 }
 103
 104 add_task(async function() {
 105   for (const panningModel of types) {
 106     await test(panningModel);
 107   }
 108 });
 109
 110 </script>
 111 </pre>
 112 </body>
 113 </html>