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1 /* | 1 /* |
2 * Copyright (C) 2012 Google Inc. All rights reserved. | 2 * Copyright (C) 2012 Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * | 7 * |
8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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34 | 34 |
35 #include "platform/audio/FFTFrame.h" | 35 #include "platform/audio/FFTFrame.h" |
36 #include "platform/audio/VectorMath.h" | 36 #include "platform/audio/VectorMath.h" |
37 #include "modules/webaudio/OscillatorNode.h" | 37 #include "modules/webaudio/OscillatorNode.h" |
38 #include <algorithm> | 38 #include <algorithm> |
39 | 39 |
40 const unsigned PeriodicWaveSize = 4096; // This must be a power of two. | 40 const unsigned PeriodicWaveSize = 4096; // This must be a power of two. |
41 const unsigned NumberOfRanges = 36; // There should be 3 * log2(PeriodicWaveSize
) 1/3 octave ranges. | 41 const unsigned NumberOfRanges = 36; // There should be 3 * log2(PeriodicWaveSize
) 1/3 octave ranges. |
42 const float CentsPerRange = 1200 / 3; // 1/3 Octave. | 42 const float CentsPerRange = 1200 / 3; // 1/3 Octave. |
43 | 43 |
44 namespace WebCore { | 44 namespace blink { |
45 | 45 |
46 using namespace VectorMath; | 46 using namespace VectorMath; |
47 | 47 |
48 PassRefPtrWillBeRawPtr<PeriodicWave> PeriodicWave::create(float sampleRate, Floa
t32Array* real, Float32Array* imag) | 48 PassRefPtrWillBeRawPtr<PeriodicWave> PeriodicWave::create(float sampleRate, Floa
t32Array* real, Float32Array* imag) |
49 { | 49 { |
50 bool isGood = real && imag && real->length() == imag->length(); | 50 bool isGood = real && imag && real->length() == imag->length(); |
51 ASSERT(isGood); | 51 ASSERT(isGood); |
52 if (isGood) { | 52 if (isGood) { |
53 RefPtrWillBeRawPtr<PeriodicWave> periodicWave = adoptRefWillBeNoop(new P
eriodicWave(sampleRate)); | 53 RefPtrWillBeRawPtr<PeriodicWave> periodicWave = adoptRefWillBeNoop(new P
eriodicWave(sampleRate)); |
54 size_t numberOfComponents = real->length(); | 54 size_t numberOfComponents = real->length(); |
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293 break; | 293 break; |
294 } | 294 } |
295 | 295 |
296 realP[n] = 0; | 296 realP[n] = 0; |
297 imagP[n] = b; | 297 imagP[n] = b; |
298 } | 298 } |
299 | 299 |
300 createBandLimitedTables(realP, imagP, halfSize); | 300 createBandLimitedTables(realP, imagP, halfSize); |
301 } | 301 } |
302 | 302 |
303 } // namespace WebCore | 303 } // namespace blink |
304 | 304 |
305 #endif // ENABLE(WEB_AUDIO) | 305 #endif // ENABLE(WEB_AUDIO) |
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