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 "FFTConvolver.h" 33 34 #include "nsTArray.h" 35 #include "mozilla/FFTBlock.h" 36 #include "mozilla/MemoryReporting.h" 37 #include "mozilla/UniquePtr.h" 38 39 namespace WebCore { 40 41 using mozilla::FFTBlock; 42 43 class ReverbAccumulationBuffer; 44 class ReverbConvolver; 45 46 // A ReverbConvolverStage represents the convolution associated with a 47 // sub-section of a large impulse response. It incorporates a delay line to 48 // account for the offset of the sub-section within the larger impulse response. 49 class ReverbConvolverStage { 50 public: 51 // renderPhase is useful to know so that we can manipulate the pre versus post 52 // delay so that stages will perform their heavy work (FFT processing) on 53 // different slices to balance the load in a real-time thread. 54 ReverbConvolverStage(const float* impulseResponse, size_t responseLength, 55 size_t reverbTotalLatency, size_t stageOffset, 56 size_t stageLength, size_t fftSize, size_t renderPhase, 57 ReverbAccumulationBuffer*); 58 59 // |source| must point to an array of WEBAUDIO_BLOCK_SIZE elements. 60 void process(const float* source); 61 62 void processInBackground(ReverbConvolver* convolver); 63 64 // Useful for background processing inputReadIndex()65 int inputReadIndex() const { return m_inputReadIndex; } 66 67 size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; 68 69 private: 70 mozilla::UniquePtr<FFTBlock> m_fftKernel; 71 mozilla::UniquePtr<FFTConvolver> m_fftConvolver; 72 73 ReverbAccumulationBuffer* m_accumulationBuffer; 74 size_t m_accumulationReadIndex; 75 int m_inputReadIndex; 76 77 size_t m_postDelayLength; 78 79 nsTArray<float> m_temporaryBuffer; 80 }; 81 82 } // namespace WebCore 83 84 #endif // ReverbConvolverStage_h 85