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comparison: content/media/webaudio/test/test_bug964376.html
content/media/webaudio/test/test_bug964376.html
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| -1:000000000000 | 0:82d49bd3e192 |
|---|---|
| 1 <!DOCTYPE HTML> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>Test repeating audio is not distorted</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 function gcd(a, b) { | |
| 14 if (b === 0) { | |
| 15 return a; | |
| 16 } | |
| 17 return gcd(b, a % b); | |
| 18 } | |
| 19 | |
| 20 var SAMPLE_PLACEMENT = 128; | |
| 21 | |
| 22 var gTest = { | |
| 23 length: 2048, | |
| 24 numberOfChannels: 1, | |
| 25 | |
| 26 createGraph: function(context) { | |
| 27 var freq = Math.round(context.sampleRate / SAMPLE_PLACEMENT); | |
| 28 var dur = context.sampleRate / gcd(freq, context.sampleRate); | |
| 29 var buffer = context.createBuffer(1, dur, context.sampleRate); | |
| 30 | |
| 31 for (var i = 0; i < context.sampleRate; ++i) { | |
| 32 buffer.getChannelData(0)[i] = Math.sin(freq * 2 * Math.PI * i / context.sampleRate); | |
| 33 } | |
| 34 | |
| 35 var source = context.createBufferSource(); | |
| 36 source.buffer = buffer; | |
| 37 source.loop = true; | |
| 38 source.playbackRate.setValueAtTime(0.5, SAMPLE_PLACEMENT / context.sampleRate); | |
| 39 source.start(0); | |
| 40 | |
| 41 return source; | |
| 42 }, | |
| 43 | |
| 44 createExpectedBuffers: function(context) { | |
| 45 var freq = Math.round(context.sampleRate / SAMPLE_PLACEMENT); | |
| 46 var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate); | |
| 47 var c = expectedBuffer.getChannelData(0); | |
| 48 for (var i = 0; i < c.length; ++i) { | |
| 49 if (i < SAMPLE_PLACEMENT) { | |
| 50 c[i] = Math.sin(freq * 2 * Math.PI * i / context.sampleRate); | |
| 51 } else { | |
| 52 c[i] = Math.sin(freq / 2 * 2 * Math.PI * (i + SAMPLE_PLACEMENT) / context.sampleRate); | |
| 53 } | |
| 54 } | |
| 55 | |
| 56 return expectedBuffer; | |
| 57 }, | |
| 58 }; | |
| 59 | |
| 60 runTest(); | |
| 61 </script> | |
| 62 </pre> | |
| 63 </body> | |
| 64 </html> |
