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