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 42 namespace blink { 43 class WebThread; 44 } 45 46 namespace WebCore { 47 48 class AudioChannel; 49 50 class PLATFORM_EXPORT ReverbConvolver { 51 WTF_MAKE_NONCOPYABLE(ReverbConvolver); 52 public: 53 // maxFFTSize can be adjusted (from say 2048 to 32768) depending on how much precision is necessary. 54 // For certain tweaky de-convolving applications the phase errors add up quickly and lead to non-sensical results with 55 // larger FFT sizes and single-precision floats. In these cases 2048 is a good size. 56 // If not doing multi-threaded convolution, then should not go > 8192. 57 ReverbConvolver(AudioChannel* impulseResponse, size_t renderSliceSize, size_t maxFFTSize, size_t convolverRenderPhase, bool useBackgroundThreads); 58 ~ReverbConvolver(); 59 60 void process(const AudioChannel* sourceChannel, AudioChannel* destinationChannel, size_t framesToProcess); 61 void reset(); 62 63 ReverbInputBuffer* inputBuffer() { return &m_inputBuffer; } 64 65 size_t latencyFrames() const; 66 private: 67 void processInBackground(); 68 69 Vector<OwnPtr<ReverbConvolverStage> > m_stages; 70 Vector<OwnPtr<ReverbConvolverStage> > m_backgroundStages; 71 size_t m_impulseResponseLength; 72 73 ReverbAccumulationBuffer m_accumulationBuffer; 74 75 // One or more background threads read from this input buffer which is fed from the realtime thread. 76 ReverbInputBuffer m_inputBuffer; 77 78 // First stage will be of size m_minFFTSize. Each next stage will be twice as big until we hit m_maxFFTSize. 79 size_t m_minFFTSize; 80 size_t m_maxFFTSize; 81 82 // But don't exceed this size in the real-time thread (if we're doing background processing). 83 size_t m_maxRealtimeFFTSize; 84 85 // Background thread and synchronization 86 OwnPtr<blink::WebThread> m_backgroundThread; 87 }; 88 89 } // namespace WebCore 90 91 #endif // ReverbConvolver_h 92
