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comparison: content/media/webaudio/blink/ReverbAccumulationBuffer.h
content/media/webaudio/blink/ReverbAccumulationBuffer.h
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| 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 ReverbAccumulationBuffer_h | |
| 30 #define ReverbAccumulationBuffer_h | |
| 31 | |
| 32 #include "nsTArray.h" | |
| 33 #include "mozilla/MemoryReporting.h" | |
| 34 | |
| 35 namespace WebCore { | |
| 36 | |
| 37 typedef nsTArray<float> AudioFloatArray; | |
| 38 | |
| 39 // ReverbAccumulationBuffer is a circular delay buffer with one client reading from it and multiple clients | |
| 40 // writing/accumulating to it at different delay offsets from the read position. The read operation will zero the memory | |
| 41 // just read from the buffer, so it will be ready for accumulation the next time around. | |
| 42 class ReverbAccumulationBuffer { | |
| 43 public: | |
| 44 ReverbAccumulationBuffer(size_t length); | |
| 45 | |
| 46 // This will read from, then clear-out numberOfFrames | |
| 47 void readAndClear(float* destination, size_t numberOfFrames); | |
| 48 | |
| 49 // Each ReverbConvolverStage will accumulate its output at the appropriate delay from the read position. | |
| 50 // We need to pass in and update readIndex here, since each ReverbConvolverStage may be running in | |
| 51 // a different thread than the realtime thread calling ReadAndClear() and maintaining m_readIndex | |
| 52 // Returns the writeIndex where the accumulation took place | |
| 53 int accumulate(float* source, size_t numberOfFrames, int* readIndex, size_t delayFrames); | |
| 54 | |
| 55 size_t readIndex() const { return m_readIndex; } | |
| 56 void updateReadIndex(int* readIndex, size_t numberOfFrames) const; | |
| 57 | |
| 58 size_t readTimeFrame() const { return m_readTimeFrame; } | |
| 59 | |
| 60 void reset(); | |
| 61 | |
| 62 size_t sizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const | |
| 63 { | |
| 64 return m_buffer.SizeOfExcludingThis(aMallocSizeOf); | |
| 65 } | |
| 66 | |
| 67 private: | |
| 68 AudioFloatArray m_buffer; | |
| 69 size_t m_readIndex; | |
| 70 size_t m_readTimeFrame; // for debugging (frame on continuous timeline) | |
| 71 }; | |
| 72 | |
| 73 } // namespace WebCore | |
| 74 | |
| 75 #endif // ReverbAccumulationBuffer_h |
