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 Reverb_h 30 #define Reverb_h 31 32 #include "platform/audio/ReverbConvolver.h" 33 #include "wtf/Noncopyable.h" 34 #include "wtf/Vector.h" 35 36 namespace WebCore { 37 38 class AudioBus; 39 40 // Multi-channel convolution reverb with channel matrixing - one or more ReverbConvolver objects are used internally. 41 42 class PLATFORM_EXPORT Reverb { 43 WTF_MAKE_NONCOPYABLE(Reverb); 44 public: 45 enum { MaxFrameSize = 256 }; 46 47 // renderSliceSize is a rendering hint, so the FFTs can be optimized to not all occur at the same time (very bad when rendering on a real-time thread). 48 Reverb(AudioBus* impulseResponseBuffer, size_t renderSliceSize, size_t maxFFTSize, size_t numberOfChannels, bool useBackgroundThreads, bool normalize); 49 50 void process(const AudioBus* sourceBus, AudioBus* destinationBus, size_t framesToProcess); 51 void reset(); 52 53 size_t impulseResponseLength() const { return m_impulseResponseLength; } 54 size_t latencyFrames() const; 55 56 private: 57 void initialize(AudioBus* impulseResponseBuffer, size_t renderSliceSize, size_t maxFFTSize, size_t numberOfChannels, bool useBackgroundThreads); 58 59 size_t m_impulseResponseLength; 60 61 Vector<OwnPtr<ReverbConvolver> > m_convolvers; 62 63 // For "True" stereo processing 64 RefPtr<AudioBus> m_tempBuffer; 65 }; 66 67 } // namespace WebCore 68 69 #endif // Reverb_h 70
