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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 ReverbAccumulationBuffer_h
#define ReverbAccumulationBuffer_h
#include "AlignedTArray.h"
#include "mozilla/MemoryReporting.h"
namespace WebCore {
// ReverbAccumulationBuffer is a circular delay buffer with one client reading
// from it and multiple clients writing/accumulating to it at different delay
// offsets from the read position. The read operation will zero the memory just
// read from the buffer, so it will be ready for accumulation the next time
// around.
class ReverbAccumulationBuffer {
public:
explicit ReverbAccumulationBuffer(size_t length);
// This will read from, then clear-out numberOfFrames
void readAndClear(float* destination, size_t numberOfFrames);
// Each ReverbConvolverStage will accumulate its output at the appropriate
// delay from the read position. We need to pass in and update readIndex here,
// since each ReverbConvolverStage may be running in a different thread than
// the realtime thread calling ReadAndClear() and maintaining m_readIndex
// Returns the writeIndex where the accumulation took place
int accumulate(const float* source, size_t numberOfFrames, int* readIndex,
size_t delayFrames);
size_t readIndex() const { return m_readIndex; }
void updateReadIndex(int* readIndex, size_t numberOfFrames) const;
size_t readTimeFrame() const { return m_readTimeFrame; }
void reset();
size_t sizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
return m_buffer.ShallowSizeOfExcludingThis(aMallocSizeOf);
}
private:
AlignedTArray<float, 16> m_buffer;
size_t m_readIndex;
size_t m_readTimeFrame; // for debugging (frame on continuous timeline)
};
} // namespace WebCore
#endif // ReverbAccumulationBuffer_h