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 "platform/audio/AudioArray.h" 33 #include "platform/audio/FFTFrame.h" 34 #include "wtf/Noncopyable.h" 35 #include "wtf/OwnPtr.h" 36 37 namespace WebCore { 38 39 class ReverbAccumulationBuffer; 40 class ReverbConvolver; 41 class FFTConvolver; 42 class DirectConvolver; 43 44 // A ReverbConvolverStage represents the convolution associated with a sub-section of a large impulse response. 45 // It incorporates a delay line to account for the offset of the sub-section within the larger impulse response. 46 class PLATFORM_EXPORT ReverbConvolverStage { 47 WTF_MAKE_NONCOPYABLE(ReverbConvolverStage); 48 public: 49 // renderPhase is useful to know so that we can manipulate the pre versus post delay so that stages will perform 50 // their heavy work (FFT processing) on different slices to balance the load in a real-time thread. 51 ReverbConvolverStage(const float* impulseResponse, size_t responseLength, size_t reverbTotalLatency, size_t stageOffset, size_t stageLength, size_t fftSize, size_t renderPhase, size_t renderSliceSize, ReverbAccumulationBuffer*, bool directMode = false); 52 53 // WARNING: framesToProcess must be such that it evenly divides the delay buffer size (stage_offset). 54 void process(const float* source, size_t framesToProcess); 55 56 void processInBackground(ReverbConvolver* convolver, size_t framesToProcess); 57 58 void reset(); 59 60 // Useful for background processing 61 int inputReadIndex() const { return m_inputReadIndex; } 62 63 private: 64 OwnPtr<FFTFrame> m_fftKernel; 65 OwnPtr<FFTConvolver> m_fftConvolver; 66 67 AudioFloatArray m_preDelayBuffer; 68 69 ReverbAccumulationBuffer* m_accumulationBuffer; 70 int m_accumulationReadIndex; 71 int m_inputReadIndex; 72 73 size_t m_preDelayLength; 74 size_t m_postDelayLength; 75 size_t m_preReadWriteIndex; 76 size_t m_framesProcessed; 77 78 AudioFloatArray m_temporaryBuffer; 79 80 bool m_directMode; 81 OwnPtr<AudioFloatArray> m_directKernel; 82 OwnPtr<DirectConvolver> m_directConvolver; 83 }; 84 85 } // namespace WebCore 86 87 #endif // ReverbConvolverStage_h 88
