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comparison: content/media/webaudio/test/test_audioParamExponentialRamp.html
content/media/webaudio/test/test_audioParamExponentialRamp.html
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| 1 <!DOCTYPE HTML> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>Test AudioParam.exponentialRampToValue</title> | |
| 5 <script type="text/javascript" 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 V0 = 0.1; | |
| 14 var V1 = 0.9; | |
| 15 var T0 = 0; | |
| 16 | |
| 17 var gTest = { | |
| 18 length: 2048, | |
| 19 numberOfChannels: 1, | |
| 20 createGraph: function(context) { | |
| 21 var sourceBuffer = context.createBuffer(1, 2048, context.sampleRate); | |
| 22 for (var i = 0; i < 2048; ++i) { | |
| 23 sourceBuffer.getChannelData(0)[i] = 1; | |
| 24 } | |
| 25 | |
| 26 var source = context.createBufferSource(); | |
| 27 source.buffer = sourceBuffer; | |
| 28 | |
| 29 var gain = context.createGain(); | |
| 30 gain.gain.setValueAtTime(V0, 0); | |
| 31 gain.gain.exponentialRampToValueAtTime(V1, 2048/context.sampleRate); | |
| 32 | |
| 33 source.connect(gain); | |
| 34 | |
| 35 source.start(0); | |
| 36 return gain; | |
| 37 }, | |
| 38 createExpectedBuffers: function(context) { | |
| 39 var T1 = 2048 / context.sampleRate; | |
| 40 var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate); | |
| 41 for (var i = 0; i < 2048; ++i) { | |
| 42 var t = i / context.sampleRate; | |
| 43 expectedBuffer.getChannelData(0)[i] = V0 * Math.pow(V1 / V0, (t - T0) / (T1 - T0)); | |
| 44 } | |
| 45 return expectedBuffer; | |
| 46 }, | |
| 47 }; | |
| 48 | |
| 49 runTest(); | |
| 50 | |
| 51 </script> | |
| 52 </pre> | |
| 53 </body> | |
| 54 </html> |
