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Side by Side Diff: third_party/WebKit/LayoutTests/webaudio/resources/oscillator-testing.js

Issue 2581463002: Refactor WebAudio test directory (Closed)
Patch Set: Use correct path for wav result files Created 4 years ago
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1 // Notes about generated waveforms: 1 // Notes about generated waveforms:
2 // 2 //
3 // QUESTION: Why does the wave shape not look like the exact shape (sharp edges) ? 3 // QUESTION: Why does the wave shape not look like the exact shape (sharp edges) ?
4 // ANSWER: Because a shape with sharp edges has infinitely high frequency conten t. 4 // ANSWER: Because a shape with sharp edges has infinitely high frequency conten t.
5 // Since a digital audio signal must be band-limited based on the nyquist freque ncy (half the sample-rate) 5 // Since a digital audio signal must be band-limited based on the nyquist freque ncy (half the sample-rate)
6 // in order to avoid aliasing, this creates more rounded edges and "ringing" in the 6 // in order to avoid aliasing, this creates more rounded edges and "ringing" in the
7 // appearance of the waveform. See Nyquist-Shannon sampling theorem: 7 // appearance of the waveform. See Nyquist-Shannon sampling theorem:
8 // http://en.wikipedia.org/wiki/Nyquist%E2%80%93Shannon_sampling_theorem 8 // http://en.wikipedia.org/wiki/Nyquist%E2%80%93Shannon_sampling_theorem
9 // 9 //
10 // QUESTION: Why does the very end of the generated signal appear to get slightl y weaker? 10 // QUESTION: Why does the very end of the generated signal appear to get slightl y weaker?
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105 { 105 {
106 if (nPower == 0 && sPower > 0) { 106 if (nPower == 0 && sPower > 0) {
107 return 1000; 107 return 1000;
108 } 108 }
109 return 10 * Math.log10(sPower / nPower); 109 return 10 * Math.log10(sPower / nPower);
110 } 110 }
111 111
112 function loadReferenceAndRunTest(oscType) { 112 function loadReferenceAndRunTest(oscType) {
113 var bufferLoader = new BufferLoader( 113 var bufferLoader = new BufferLoader(
114 context, 114 context,
115 [ "oscillator-" + oscType + "-expected.wav" ], 115 [ "../Oscillator/oscillator-" + oscType + "-expected.wav" ],
116 function (bufferList) { 116 function (bufferList) {
117 reference = bufferList[0].getChannelData(0); 117 reference = bufferList[0].getChannelData(0);
118 generateExponentialOscillatorSweep(context, oscType); 118 generateExponentialOscillatorSweep(context, oscType);
119 context.oncomplete = checkResult; 119 context.oncomplete = checkResult;
120 context.startRendering(); 120 context.startRendering();
121 }); 121 });
122 122
123 bufferLoader.load(); 123 bufferLoader.load();
124 } 124 }
125 125
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206 thresholdDiff: thresholdDiff, 206 thresholdDiff: thresholdDiff,
207 thresholdDiffCount: thresholdDiffCount, 207 thresholdDiffCount: thresholdDiffCount,
208 waveScaleFactor: waveScaleFactor, 208 waveScaleFactor: waveScaleFactor,
209 setThresholds: setThresholds, 209 setThresholds: setThresholds,
210 loadReferenceAndRunTest: loadReferenceAndRunTest, 210 loadReferenceAndRunTest: loadReferenceAndRunTest,
211 runTest: runTest, 211 runTest: runTest,
212 createNewReference: createNewReference, 212 createNewReference: createNewReference,
213 }; 213 };
214 214
215 }()); 215 }());
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