| /* |
| * Copyright (C) 2010 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| * its contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef ReverbAccumulationBuffer_h |
| #define ReverbAccumulationBuffer_h |
| |
| #include "platform/PlatformExport.h" |
| #include "platform/audio/AudioArray.h" |
| |
| namespace WebCore { |
| |
| // ReverbAccumulationBuffer is a circular delay buffer with one client reading from it and multiple clients |
| // writing/accumulating to it at different delay offsets from the read position. The read operation will zero the memory |
| // just read from the buffer, so it will be ready for accumulation the next time around. |
| class PLATFORM_EXPORT ReverbAccumulationBuffer { |
| public: |
| ReverbAccumulationBuffer(size_t length); |
| |
| // This will read from, then clear-out numberOfFrames |
| void readAndClear(float* destination, size_t numberOfFrames); |
| |
| // Each ReverbConvolverStage will accumulate its output at the appropriate delay from the read position. |
| // We need to pass in and update readIndex here, since each ReverbConvolverStage may be running in |
| // a different thread than the realtime thread calling ReadAndClear() and maintaining m_readIndex |
| // Returns the writeIndex where the accumulation took place |
| int accumulate(float* source, size_t numberOfFrames, int* readIndex, size_t delayFrames); |
| |
| size_t readIndex() const { return m_readIndex; } |
| void updateReadIndex(int* readIndex, size_t numberOfFrames) const; |
| |
| size_t readTimeFrame() const { return m_readTimeFrame; } |
| |
| void reset(); |
| |
| private: |
| AudioFloatArray m_buffer; |
| size_t m_readIndex; |
| size_t m_readTimeFrame; // for debugging (frame on continuous timeline) |
| }; |
| |
| } // namespace WebCore |
| |
| #endif // ReverbAccumulationBuffer_h |