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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ReverbConvolverStage_h
#define ReverbConvolverStage_h
#include "FFTConvolver.h"
#include "nsTArray.h"
#include "mozilla/FFTBlock.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/UniquePtr.h"
namespace WebCore {
using mozilla::FFTBlock;
class ReverbAccumulationBuffer;
class ReverbConvolver;
// A ReverbConvolverStage represents the convolution associated with a
// sub-section of a large impulse response. It incorporates a delay line to
// account for the offset of the sub-section within the larger impulse response.
class ReverbConvolverStage {
public:
// renderPhase is useful to know so that we can manipulate the pre versus post
// delay so that stages will perform their heavy work (FFT processing) on
// different slices to balance the load in a real-time thread.
ReverbConvolverStage(const float* impulseResponse, size_t responseLength,
size_t reverbTotalLatency, size_t stageOffset,
size_t stageLength, size_t fftSize, size_t renderPhase,
ReverbAccumulationBuffer*);
// |source| must point to an array of WEBAUDIO_BLOCK_SIZE elements.
void process(const float* source);
void processInBackground(ReverbConvolver* convolver);
// Useful for background processing
int inputReadIndex() const { return m_inputReadIndex; }
size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
private:
mozilla::UniquePtr<FFTBlock> m_fftKernel;
mozilla::UniquePtr<FFTConvolver> m_fftConvolver;
ReverbAccumulationBuffer* m_accumulationBuffer;
int m_accumulationReadIndex;
int m_inputReadIndex;
size_t m_postDelayLength;
nsTArray<float> m_temporaryBuffer;
};
} // namespace WebCore
#endif // ReverbConvolverStage_h