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comparison: content/media/webaudio/test/test_waveShaper.html
content/media/webaudio/test/test_waveShaper.html
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| -1:000000000000 | 0:3ff8a5a1b884 |
|---|---|
| 1 <!DOCTYPE HTML> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>Test WaveShaperNode with no curve</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 gTest = { | |
| 14 length: 4096, | |
| 15 numberOfChannels: 1, | |
| 16 createGraph: function(context) { | |
| 17 var source = context.createBufferSource(); | |
| 18 source.buffer = this.buffer; | |
| 19 | |
| 20 var shaper = context.createWaveShaper(); | |
| 21 shaper.curve = this.curve; | |
| 22 | |
| 23 source.connect(shaper); | |
| 24 | |
| 25 source.start(0); | |
| 26 return shaper; | |
| 27 }, | |
| 28 createExpectedBuffers: function(context) { | |
| 29 this.buffer = context.createBuffer(1, 4096, context.sampleRate); | |
| 30 for (var i = 1; i < 4095; ++i) { | |
| 31 this.buffer.getChannelData(0)[i] = 2 * (i / 4096) - 1; | |
| 32 } | |
| 33 // Two out of range values | |
| 34 this.buffer.getChannelData(0)[0] = -2; | |
| 35 this.buffer.getChannelData(0)[4095] = 2; | |
| 36 | |
| 37 this.curve = new Float32Array(2048); | |
| 38 for (var i = 0; i < 2048; ++i) { | |
| 39 this.curve[i] = Math.sin(100 * Math.PI * (i + 1) / context.sampleRate); | |
| 40 } | |
| 41 | |
| 42 var expectedBuffer = context.createBuffer(1, 4096, context.sampleRate); | |
| 43 for (var i = 1; i < 4095; ++i) { | |
| 44 var input = this.buffer.getChannelData(0)[i]; | |
| 45 var index = Math.floor(this.curve.length * (input + 1) / 2); | |
| 46 index = Math.max(0, Math.min(this.curve.length - 1, index)); | |
| 47 expectedBuffer.getChannelData(0)[i] = this.curve[index]; | |
| 48 } | |
| 49 expectedBuffer.getChannelData(0)[0] = this.curve[0]; | |
| 50 expectedBuffer.getChannelData(0)[4095] = this.curve[2047]; | |
| 51 return expectedBuffer; | |
| 52 }, | |
| 53 }; | |
| 54 | |
| 55 runTest(); | |
| 56 | |
| 57 </script> | |
| 58 </pre> | |
| 59 </body> | |
| 60 </html> |
