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 "platform/audio/AudioArray.h" 33#include "platform/audio/DirectConvolver.h" 34#include "platform/audio/FFTConvolver.h" 35#include "platform/audio/ReverbAccumulationBuffer.h" 36#include "platform/audio/ReverbConvolverStage.h" 37#include "platform/audio/ReverbInputBuffer.h" 38#include "wtf/OwnPtr.h" 39#include "wtf/RefCounted.h" 40#include "wtf/Vector.h" 41 42namespace blink { 43 44class AudioChannel; 45class WebThread; 46 47class PLATFORM_EXPORT ReverbConvolver { 48 WTF_MAKE_NONCOPYABLE(ReverbConvolver); 49public: 50 // maxFFTSize can be adjusted (from say 2048 to 32768) depending on how much precision is necessary. 51 // For certain tweaky de-convolving applications the phase errors add up quickly and lead to non-sensical results with 52 // larger FFT sizes and single-precision floats. In these cases 2048 is a good size. 53 // If not doing multi-threaded convolution, then should not go > 8192. 54 ReverbConvolver(AudioChannel* impulseResponse, size_t renderSliceSize, size_t maxFFTSize, size_t convolverRenderPhase, bool useBackgroundThreads); 55 ~ReverbConvolver(); 56 57 void process(const AudioChannel* sourceChannel, AudioChannel* destinationChannel, size_t framesToProcess); 58 void reset(); 59 60 ReverbInputBuffer* inputBuffer() { return &m_inputBuffer; } 61 62 size_t latencyFrames() const; 63private: 64 void processInBackground(); 65 66 Vector<OwnPtr<ReverbConvolverStage> > m_stages; 67 Vector<OwnPtr<ReverbConvolverStage> > m_backgroundStages; 68 size_t m_impulseResponseLength; 69 70 ReverbAccumulationBuffer m_accumulationBuffer; 71 72 // One or more background threads read from this input buffer which is fed from the realtime thread. 73 ReverbInputBuffer m_inputBuffer; 74 75 // First stage will be of size m_minFFTSize. Each next stage will be twice as big until we hit m_maxFFTSize. 76 size_t m_minFFTSize; 77 size_t m_maxFFTSize; 78 79 // But don't exceed this size in the real-time thread (if we're doing background processing). 80 size_t m_maxRealtimeFFTSize; 81 82 // Background thread and synchronization 83 OwnPtr<WebThread> m_backgroundThread; 84}; 85 86} // namespace blink 87 88#endif // ReverbConvolver_h 89