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75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
/*
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* Copyright (C) 2010 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef FFTConvolver_h
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#define FFTConvolver_h
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#include "nsTArray.h"
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#include "mozilla/FFTBlock.h"
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namespace WebCore {
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typedef nsTArray<float> AudioFloatArray;
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using mozilla::FFTBlock;
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class FFTConvolver {
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public:
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// fftSize must be a power of two
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FFTConvolver(size_t fftSize);
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// For now, with multiple calls to Process(), framesToProcess MUST add up EXACTLY to fftSize / 2
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//
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// FIXME: Later, we can do more sophisticated buffering to relax this requirement...
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//
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// The input to output latency is equal to fftSize / 2
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//
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// Processing in-place is allowed...
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void process(FFTBlock* fftKernel, const float* sourceP, float* destP, size_t framesToProcess);
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void reset();
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size_t fftSize() const { return m_frame.FFTSize(); }
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private:
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FFTBlock m_frame;
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// Buffer input until we get fftSize / 2 samples then do an FFT
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size_t m_readWriteIndex;
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AudioFloatArray m_inputBuffer;
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// Stores output which we read a little at a time
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AudioFloatArray m_outputBuffer;
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// Saves the 2nd half of the FFT buffer, so we can do an overlap-add with the 1st half of the next one
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AudioFloatArray m_lastOverlapBuffer;
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};
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} // namespace WebCore
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#endif // FFTConvolver_h
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