third_party/WebKit/LayoutTests/webaudio/oscillator-basic.html

   1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
   2
   3 <!--
   4 Create an oscillator of each type and verify that the type is set correctly.
   5 -->
   6 <html>
   7 <head>
   8 <script src="resources/compatibility.js"></script>
   9 <script type="text/javascript" src="resources/audio-testing.js"></script>
  10 <script type="text/javascript" src="../resources/js-test.js"></script>
  11 </head>
  12
  13 <body>
  14 <div id="description"></div>
  15 <div id="console"></div>
  16
  17 <script>
  18 description("Basic test of setting Oscillator node types.");
  19
  20 var sampleRate = 44100;
  21 var renderLengthSeconds = 0.25;
  22
  23 var oscTypes = ["sine", "square", "sawtooth", "triangle", "custom"];
  24
  25 function runTest()
  26 {
  27     if (window.testRunner) {
  28         testRunner.dumpAsText();
  29         testRunner.waitUntilDone();
  30     }
  31
  32     window.jsTestIsAsync = true;
  33
  34     // Create offline audio context.
  35     var context = new OfflineAudioContext(2, sampleRate * renderLengthSeconds, sampleRate);
  36     var osc = context.createOscillator();
  37
  38     // Set each possible oscillator type (except CUSTOM) and verify that the type is correct.
  39     // Here we're setting the type using WebIDL enum values which are strings.
  40     for (var k = 0; k < oscTypes.length - 1; ++k) {
  41         osc.type = oscTypes[k];
  42         Should("osc.type = '" + oscTypes[k] + "'", osc.type).beEqualTo(oscTypes[k]);
  43     }
  44
  45     // Verify that setting a custom type directly does not set the custom type. This test has to be
  46     // done before using setPeriodicWave.
  47
  48     Should("osc.type = 'custom'", function () {
  49       osc.type = "custom";
  50     }).throw('InvalidStateError');
  51
  52     // Now set a custom oscillator
  53     var coeffA = new Float32Array([0, 1, 0.5]);
  54     var coeffB = new Float32Array([0, 0, 0]);
  55     var wave = context.createPeriodicWave(coeffA, coeffB);
  56
  57     Should("osc.setPeriodicWave(wave)", function () {
  58       osc.setPeriodicWave(wave);
  59     }).notThrow();
  60     Should("osc.type", osc.type).beEqualTo("custom");
  61
  62     // Check that numerical values are no longer supported
  63     var oldType = osc.type;
  64     osc.type = 0;
  65     Should("osc.type = 0", osc.type).notBeEqualTo(0);
  66     Should("osc.type", osc.type).beEqualTo(oldType);
  67
  68     finishJSTest();
  69 }
  70
  71 runTest();
  72 successfullyParsed = true;
  73
  74 </script>
  75
  76
  77 </body>
  78 </html>