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1 /* | 1 /* |
2 * Copyright (C) 2010 Google Inc. All rights reserved. | 2 * Copyright (C) 2010 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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27 */ | 27 */ |
28 | 28 |
29 #ifndef FFTConvolver_h | 29 #ifndef FFTConvolver_h |
30 #define FFTConvolver_h | 30 #define FFTConvolver_h |
31 | 31 |
32 #include "platform/audio/AudioArray.h" | 32 #include "platform/audio/AudioArray.h" |
33 #include "platform/audio/FFTFrame.h" | 33 #include "platform/audio/FFTFrame.h" |
34 #include "wtf/Allocator.h" | 34 #include "wtf/Allocator.h" |
35 #include "wtf/Noncopyable.h" | 35 #include "wtf/Noncopyable.h" |
36 | 36 |
37 #if ENABLE(WEB_AUDIO) | |
38 | |
39 namespace blink { | 37 namespace blink { |
40 | 38 |
41 class PLATFORM_EXPORT FFTConvolver { | 39 class PLATFORM_EXPORT FFTConvolver { |
42 USING_FAST_MALLOC(FFTConvolver); | 40 USING_FAST_MALLOC(FFTConvolver); |
43 WTF_MAKE_NONCOPYABLE(FFTConvolver); | 41 WTF_MAKE_NONCOPYABLE(FFTConvolver); |
44 public: | 42 public: |
45 // fftSize must be a power of two | 43 // fftSize must be a power of two |
46 FFTConvolver(size_t fftSize); | 44 FFTConvolver(size_t fftSize); |
47 | 45 |
48 // For now, with multiple calls to Process(), framesToProcess MUST add up EX
ACTLY to fftSize / 2 | 46 // For now, with multiple calls to Process(), framesToProcess MUST add up EX
ACTLY to fftSize / 2 |
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67 | 65 |
68 // Stores output which we read a little at a time | 66 // Stores output which we read a little at a time |
69 AudioFloatArray m_outputBuffer; | 67 AudioFloatArray m_outputBuffer; |
70 | 68 |
71 // Saves the 2nd half of the FFT buffer, so we can do an overlap-add with th
e 1st half of the next one | 69 // Saves the 2nd half of the FFT buffer, so we can do an overlap-add with th
e 1st half of the next one |
72 AudioFloatArray m_lastOverlapBuffer; | 70 AudioFloatArray m_lastOverlapBuffer; |
73 }; | 71 }; |
74 | 72 |
75 } // namespace blink | 73 } // namespace blink |
76 | 74 |
77 #endif // ENABLE(WEB_AUDIO) | |
78 | |
79 #endif // FFTConvolver_h | 75 #endif // FFTConvolver_h |
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