/*

 * 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 "ReverbAccumulationBuffer.h"

#include "ReverbInputBuffer.h"

#include "nsAutoPtr.h"

#include "mozilla/MemoryReporting.h"

#ifdef LOG

#undef LOG

#endif

#include "base/condition_variable.h"

#include "base/lock.h"

#include "base/thread.h"

namespace WebCore {

class ReverbConvolverStage;

class 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(const float* impulseResponseData,

                    size_t impulseResponseLength, size_t maxFFTSize,

                    size_t convolverRenderPhase, bool useBackgroundThreads);

    ~ReverbConvolver();

    void process(const float* sourceChannelData,

                 float* destinationChannelData);

    size_t impulseResponseLength() const { return m_impulseResponseLength; }

    ReverbInputBuffer* inputBuffer() { return &m_inputBuffer; }

    bool useBackgroundThreads() const { return m_useBackgroundThreads; }

    void backgroundThreadEntry();

    size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;

private:

    nsTArray<nsAutoPtr<ReverbConvolverStage> > m_stages;

    nsTArray<nsAutoPtr<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;

    // Background thread and synchronization

    base::Thread m_backgroundThread;

    Lock m_backgroundThreadLock;

    ConditionVariable m_backgroundThreadCondition;

    bool m_useBackgroundThreads;

    bool m_wantsToExit;

    bool m_moreInputBuffered;

};

} // namespace WebCore

#endif // ReverbConvolver_h