Line data    Source code

       1             : /*
       2             :  * Copyright (C) 2010 Google Inc. All rights reserved.
       3             :  *
       4             :  * Redistribution and use in source and binary forms, with or without
       5             :  * modification, are permitted provided that the following conditions
       6             :  * are met:
       7             :  *
       8             :  * 1.  Redistributions of source code must retain the above copyright
       9             :  *     notice, this list of conditions and the following disclaimer.
      10             :  * 2.  Redistributions in binary form must reproduce the above copyright
      11             :  *     notice, this list of conditions and the following disclaimer in the
      12             :  *     documentation and/or other materials provided with the distribution.
      13             :  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
      14             :  *     its contributors may be used to endorse or promote products derived
      15             :  *     from this software without specific prior written permission.
      16             :  *
      17             :  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
      18             :  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
      19             :  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
      20             :  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
      21             :  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
      22             :  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
      23             :  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
      24             :  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      25             :  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
      26             :  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      27             :  */
      28             : 
      29             : #ifndef ReverbConvolver_h
      30             : #define ReverbConvolver_h
      31             : 
      32             : #include "ReverbAccumulationBuffer.h"
      33             : #include "ReverbInputBuffer.h"
      34             : #include "nsAutoPtr.h"
      35             : #include "mozilla/MemoryReporting.h"
      36             : #ifdef LOG
      37             : #undef LOG
      38             : #endif
      39             : #include "base/condition_variable.h"
      40             : #include "base/lock.h"
      41             : #include "base/thread.h"
      42             : 
      43             : namespace WebCore {
      44             : 
      45             : class ReverbConvolverStage;
      46             : 
      47             : class ReverbConvolver {
      48             : public:
      49             :     // maxFFTSize can be adjusted (from say 2048 to 32768) depending on how much precision is necessary.
      50             :     // For certain tweaky de-convolving applications the phase errors add up quickly and lead to non-sensical results with
      51             :     // larger FFT sizes and single-precision floats.  In these cases 2048 is a good size.
      52             :     // If not doing multi-threaded convolution, then should not go > 8192.
      53             :     ReverbConvolver(const float* impulseResponseData,
      54             :                     size_t impulseResponseLength, size_t maxFFTSize,
      55             :                     size_t convolverRenderPhase, bool useBackgroundThreads);
      56             :     ~ReverbConvolver();
      57             : 
      58             :     void process(const float* sourceChannelData,
      59             :                  float* destinationChannelData);
      60             : 
      61             :     size_t impulseResponseLength() const { return m_impulseResponseLength; }
      62             : 
      63           0 :     ReverbInputBuffer* inputBuffer() { return &m_inputBuffer; }
      64             : 
      65           0 :     bool useBackgroundThreads() const { return m_useBackgroundThreads; }
      66             :     void backgroundThreadEntry();
      67             : 
      68             :     size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
      69             : private:
      70             :     nsTArray<nsAutoPtr<ReverbConvolverStage> > m_stages;
      71             :     nsTArray<nsAutoPtr<ReverbConvolverStage> > m_backgroundStages;
      72             :     size_t m_impulseResponseLength;
      73             : 
      74             :     ReverbAccumulationBuffer m_accumulationBuffer;
      75             : 
      76             :     // One or more background threads read from this input buffer which is fed from the realtime thread.
      77             :     ReverbInputBuffer m_inputBuffer;
      78             : 
      79             :     // Background thread and synchronization
      80             :     base::Thread m_backgroundThread;
      81             :     Lock m_backgroundThreadLock;
      82             :     ConditionVariable m_backgroundThreadCondition;
      83             :     bool m_useBackgroundThreads;
      84             :     bool m_wantsToExit;
      85             :     bool m_moreInputBuffered;
      86             : };
      87             : 
      88             : } // namespace WebCore
      89             : 
      90             : #endif // ReverbConvolver_h