The Tor Browser / file comparison
comparison: content/media/webaudio/blink/FFTConvolver.h
content/media/webaudio/blink/FFTConvolver.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:17ce8c2a27f6 |
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| 1 /* | |
| 2 * Copyright (C) 2010 Google Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer in the | |
| 12 * documentation and/or other materials provided with the distribution. | |
| 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of | |
| 14 * its contributors may be used to endorse or promote products derived | |
| 15 * from this software without specific prior written permission. | |
| 16 * | |
| 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY | |
| 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
| 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY | |
| 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
| 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 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. | |
| 27 */ | |
| 28 | |
| 29 #ifndef FFTConvolver_h | |
| 30 #define FFTConvolver_h | |
| 31 | |
| 32 #include "nsTArray.h" | |
| 33 #include "mozilla/FFTBlock.h" | |
| 34 #include "mozilla/MemoryReporting.h" | |
| 35 | |
| 36 namespace WebCore { | |
| 37 | |
| 38 typedef nsTArray<float> AudioFloatArray; | |
| 39 using mozilla::FFTBlock; | |
| 40 | |
| 41 class FFTConvolver { | |
| 42 public: | |
| 43 // fftSize must be a power of two | |
| 44 FFTConvolver(size_t fftSize); | |
| 45 | |
| 46 // |fftKernel| must be pre-scaled for FFTBlock::GetInverseWithoutScaling(). | |
| 47 // | |
| 48 // For now, with multiple calls to Process(), framesToProcess MUST add up EXACTLY to fftSize / 2 | |
| 49 // | |
| 50 // FIXME: Later, we can do more sophisticated buffering to relax this requirement... | |
| 51 // | |
| 52 // The input to output latency is equal to fftSize / 2 | |
| 53 // | |
| 54 // Processing in-place is allowed... | |
| 55 void process(FFTBlock* fftKernel, const float* sourceP, float* destP, size_t framesToProcess); | |
| 56 | |
| 57 void reset(); | |
| 58 | |
| 59 size_t fftSize() const { return m_frame.FFTSize(); } | |
| 60 | |
| 61 size_t sizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; | |
| 62 size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; | |
| 63 | |
| 64 private: | |
| 65 FFTBlock m_frame; | |
| 66 | |
| 67 // Buffer input until we get fftSize / 2 samples then do an FFT | |
| 68 size_t m_readWriteIndex; | |
| 69 AudioFloatArray m_inputBuffer; | |
| 70 | |
| 71 // Stores output which we read a little at a time | |
| 72 AudioFloatArray m_outputBuffer; | |
| 73 | |
| 74 // Saves the 2nd half of the FFT buffer, so we can do an overlap-add with the 1st half of the next one | |
| 75 AudioFloatArray m_lastOverlapBuffer; | |
| 76 }; | |
| 77 | |
| 78 } // namespace WebCore | |
| 79 | |
| 80 #endif // FFTConvolver_h |
