The Tor Browser: content/media/webaudio/test/test_audioParamExponentialRamp.html@b8a032363ba2 (annotated)

content/media/webaudio/test/test_audioParamExponentialRamp.html@b8a032363ba2 (annotated)

Thu, 22 Jan 2015 13:21:57 +0100

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 <!DOCTYPE HTML>
 <html>
 <head>
   <title>Test AudioParam.exponentialRampToValue</title>
   <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
   <script type="text/javascript" src="webaudio.js"></script>
   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
 </head>
 <body>
 <pre id="test">
 <script class="testbody" type="text/javascript">
 var V0 = 0.1;
 var V1 = 0.9;
 var T0 = 0;
 var gTest = {
   length: 2048,
   numberOfChannels: 1,
   createGraph: function(context) {
     var sourceBuffer = context.createBuffer(1, 2048, context.sampleRate);
     for (var i = 0; i < 2048; ++i) {
       sourceBuffer.getChannelData(0)[i] = 1;
     }
     var source = context.createBufferSource();
     source.buffer = sourceBuffer;
     var gain = context.createGain();
     gain.gain.setValueAtTime(V0, 0);
     gain.gain.exponentialRampToValueAtTime(V1, 2048/context.sampleRate);
     source.connect(gain);
     source.start(0);
     return gain;
   },
   createExpectedBuffers: function(context) {
     var T1 = 2048 / context.sampleRate;
     var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate);
     for (var i = 0; i < 2048; ++i) {
       var t = i / context.sampleRate;
       expectedBuffer.getChannelData(0)[i] = V0 * Math.pow(V1 / V0, (t - T0) / (T1 - T0));
     }
     return expectedBuffer;
   },
 };
 runTest();
 </script>
 </pre>
 </body>
 </html>