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 ReverbConvolverStage_h
      30             : #define ReverbConvolverStage_h
      31             : 
      32             : #include "FFTConvolver.h"
      33             : 
      34             : #include "nsAutoPtr.h"
      35             : #include "nsTArray.h"
      36             : #include "mozilla/FFTBlock.h"
      37             : #include "mozilla/MemoryReporting.h"
      38             : 
      39             : namespace WebCore {
      40             : 
      41             : using mozilla::FFTBlock;
      42             : 
      43             : class ReverbAccumulationBuffer;
      44             : class ReverbConvolver;
      45             : 
      46             : // A ReverbConvolverStage represents the convolution associated with a sub-section of a large impulse response.
      47             : // It incorporates a delay line to account for the offset of the sub-section within the larger impulse response.
      48           0 : class ReverbConvolverStage {
      49             : public:
      50             :     // renderPhase is useful to know so that we can manipulate the pre versus post delay so that stages will perform
      51             :     // their heavy work (FFT processing) on different slices to balance the load in a real-time thread.
      52             :     ReverbConvolverStage(const float* impulseResponse, size_t responseLength, size_t reverbTotalLatency, size_t stageOffset, size_t stageLength, size_t fftSize, size_t renderPhase, ReverbAccumulationBuffer*);
      53             : 
      54             :     // |source| must point to an array of WEBAUDIO_BLOCK_SIZE elements.
      55             :     void process(const float* source);
      56             : 
      57             :     void processInBackground(ReverbConvolver* convolver);
      58             : 
      59             :     // Useful for background processing
      60           0 :     int inputReadIndex() const { return m_inputReadIndex; }
      61             : 
      62             :     size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
      63             : 
      64             : private:
      65             :     nsAutoPtr<FFTBlock> m_fftKernel;
      66             :     nsAutoPtr<FFTConvolver> m_fftConvolver;
      67             : 
      68             :     ReverbAccumulationBuffer* m_accumulationBuffer;
      69             :     int m_accumulationReadIndex;
      70             :     int m_inputReadIndex;
      71             : 
      72             :     size_t m_postDelayLength;
      73             : 
      74             :     nsTArray<float> m_temporaryBuffer;
      75             : };
      76             : 
      77             : } // namespace WebCore
      78             : 
      79             : #endif // ReverbConvolverStage_h