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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 ReverbConvolver_h
#define ReverbConvolver_h
#include "platform/audio/AudioArray.h"
#include "platform/audio/DirectConvolver.h"
#include "platform/audio/FFTConvolver.h"
#include "platform/audio/ReverbAccumulationBuffer.h"
#include "platform/audio/ReverbConvolverStage.h"
#include "platform/audio/ReverbInputBuffer.h"
#include "wtf/Allocator.h"
#include "wtf/Vector.h"
#include <memory>
namespace blink {
class AudioChannel;
class WebThread;
class PLATFORM_EXPORT ReverbConvolver {
USING_FAST_MALLOC(ReverbConvolver);
WTF_MAKE_NONCOPYABLE(ReverbConvolver);
public:
// maxFFTSize can be adjusted (from say 2048 to 32768) depending on how much
// precision is necessary. For certain tweaky de-convolving applications the
// phase errors add up quickly and lead to non-sensical results with larger
// FFT sizes and single-precision floats. In these cases 2048 is a good
// size. If not doing multi-threaded convolution, then should not go > 8192.
ReverbConvolver(AudioChannel* impulseResponse,
size_t renderSliceSize,
size_t maxFFTSize,
size_t convolverRenderPhase,
bool useBackgroundThreads);
~ReverbConvolver();
void process(const AudioChannel* sourceChannel,
AudioChannel* destinationChannel,
size_t framesToProcess);
void reset();
ReverbInputBuffer* inputBuffer() { return &m_inputBuffer; }
size_t latencyFrames() const;
private:
void processInBackground();
Vector<std::unique_ptr<ReverbConvolverStage>> m_stages;
Vector<std::unique_ptr<ReverbConvolverStage>> m_backgroundStages;
size_t m_impulseResponseLength;
ReverbAccumulationBuffer m_accumulationBuffer;
// One or more background threads read from this input buffer which is fed
// from the realtime thread.
ReverbInputBuffer m_inputBuffer;
// First stage will be of size m_minFFTSize. Each next stage will be twice as
// big until we hit m_maxFFTSize.
size_t m_minFFTSize;
size_t m_maxFFTSize;
// But don't exceed this size in the real-time thread (if we're doing
// background processing).
size_t m_maxRealtimeFFTSize;
// Background thread and synchronization
std::unique_ptr<WebThread> m_backgroundThread;
};
} // namespace blink
#endif // ReverbConvolver_h
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