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79 lines
3.2 KiB
C++
79 lines
3.2 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 ReverbConvolverStage_h
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#define ReverbConvolverStage_h
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#include "FFTConvolver.h"
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#include "nsTArray.h"
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#include "mozilla/FFTBlock.h"
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#include "mozilla/MemoryReporting.h"
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namespace WebCore {
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using mozilla::FFTBlock;
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class ReverbAccumulationBuffer;
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class ReverbConvolver;
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// A ReverbConvolverStage represents the convolution associated with a sub-section of a large impulse response.
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// It incorporates a delay line to account for the offset of the sub-section within the larger impulse response.
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class ReverbConvolverStage {
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public:
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// renderPhase is useful to know so that we can manipulate the pre versus post delay so that stages will perform
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// their heavy work (FFT processing) on different slices to balance the load in a real-time thread.
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ReverbConvolverStage(const float* impulseResponse, size_t responseLength, size_t reverbTotalLatency, size_t stageOffset, size_t stageLength, size_t fftSize, size_t renderPhase, ReverbAccumulationBuffer*);
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// |source| must point to an array of WEBAUDIO_BLOCK_SIZE elements.
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void process(const float* source);
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void processInBackground(ReverbConvolver* convolver);
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// Useful for background processing
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int inputReadIndex() const { return m_inputReadIndex; }
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size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
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private:
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nsAutoPtr<FFTBlock> m_fftKernel;
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nsAutoPtr<FFTConvolver> m_fftConvolver;
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ReverbAccumulationBuffer* m_accumulationBuffer;
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int m_accumulationReadIndex;
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int m_inputReadIndex;
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size_t m_postDelayLength;
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nsTArray<float> m_temporaryBuffer;
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};
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} // namespace WebCore
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#endif // ReverbConvolverStage_h
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