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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

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  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  */

 #ifndef Reverb_h

 #define Reverb_h

 #include "ReverbConvolver.h"

 #include "nsAutoPtr.h"

 #include "nsTArray.h"

 #include "AudioSegment.h"

 #include "mozilla/MemoryReporting.h"

 namespace mozilla {

 class ThreadSharedFloatArrayBufferList;

 }

 namespace WebCore {

 class DirectConvolver;

 class FFTConvolver;

 // Multi-channel convolution reverb with channel matrixing - one or more ReverbConvolver objects are used internally.

 class Reverb {

 public:

     enum { MaxFrameSize = 256 };

     // renderSliceSize is a rendering hint, so the FFTs can be optimized to not all occur at the same time (very bad when rendering on a real-time thread).

     Reverb(mozilla::ThreadSharedFloatArrayBufferList* impulseResponseBuffer, size_t impulseResponseBufferLength, size_t renderSliceSize, size_t maxFFTSize, size_t numberOfChannels, bool useBackgroundThreads, bool normalize, float sampleRate);

     void process(const mozilla::AudioChunk* sourceBus, mozilla::AudioChunk* destinationBus, size_t framesToProcess);

     void reset();

     size_t impulseResponseLength() const { return m_impulseResponseLength; }

     size_t latencyFrames() const;

     size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;

 private:

     void initialize(const nsTArray<const float*>& impulseResponseBuffer, size_t impulseResponseBufferLength, size_t renderSliceSize, size_t maxFFTSize, size_t numberOfChannels, bool useBackgroundThreads);

     size_t m_impulseResponseLength;

     nsTArray<nsAutoPtr<ReverbConvolver> > m_convolvers;

     // For "True" stereo processing

     mozilla::AudioChunk m_tempBuffer;

 };

 } // namespace WebCore

 #endif // Reverb_h