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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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25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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 | 34 |
35 namespace WebCore { | 35 namespace blink { |
36 | 36 |
37 class PLATFORM_EXPORT FFTConvolver { | 37 class PLATFORM_EXPORT FFTConvolver { |
38 public: | 38 public: |
39 // fftSize must be a power of two | 39 // fftSize must be a power of two |
40 FFTConvolver(size_t fftSize); | 40 FFTConvolver(size_t fftSize); |
41 | 41 |
42 // For now, with multiple calls to Process(), framesToProcess MUST add up EX
ACTLY to fftSize / 2 | 42 // For now, with multiple calls to Process(), framesToProcess MUST add up EX
ACTLY to fftSize / 2 |
43 // | 43 // |
44 // FIXME: Later, we can do more sophisticated buffering to relax this requir
ement... | 44 // FIXME: Later, we can do more sophisticated buffering to relax this requir
ement... |
45 // | 45 // |
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59 size_t m_readWriteIndex; | 59 size_t m_readWriteIndex; |
60 AudioFloatArray m_inputBuffer; | 60 AudioFloatArray m_inputBuffer; |
61 | 61 |
62 // Stores output which we read a little at a time | 62 // Stores output which we read a little at a time |
63 AudioFloatArray m_outputBuffer; | 63 AudioFloatArray m_outputBuffer; |
64 | 64 |
65 // Saves the 2nd half of the FFT buffer, so we can do an overlap-add with th
e 1st half of the next one | 65 // Saves the 2nd half of the FFT buffer, so we can do an overlap-add with th
e 1st half of the next one |
66 AudioFloatArray m_lastOverlapBuffer; | 66 AudioFloatArray m_lastOverlapBuffer; |
67 }; | 67 }; |
68 | 68 |
69 } // namespace WebCore | 69 } // namespace blink |
70 | 70 |
71 #endif // FFTConvolver_h | 71 #endif // FFTConvolver_h |
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