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 impulseResponseLength()61 size_t impulseResponseLength() const { return m_impulseResponseLength; } 62 inputBuffer()63 ReverbInputBuffer* inputBuffer() { return &m_inputBuffer; } 64 useBackgroundThreads()65 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 91