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| 1 /* | 1 /* |
| 2 * Copyright (C) 2010 Google Inc. All rights reserved. | 2 * Copyright (C) 2010 Google Inc. All rights reserved. |
| 3 * | 3 * |
| 4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
| 5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
| 6 * are met: | 6 * are met: |
| 7 * | 7 * |
| 8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
| 9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
| (...skipping 18 matching lines...) Expand all Loading... |
| 29 #ifndef ReverbAccumulationBuffer_h | 29 #ifndef ReverbAccumulationBuffer_h |
| 30 #define ReverbAccumulationBuffer_h | 30 #define ReverbAccumulationBuffer_h |
| 31 | 31 |
| 32 #include "platform/PlatformExport.h" | 32 #include "platform/PlatformExport.h" |
| 33 #include "platform/audio/AudioArray.h" | 33 #include "platform/audio/AudioArray.h" |
| 34 #include "wtf/Allocator.h" | 34 #include "wtf/Allocator.h" |
| 35 #include "wtf/Noncopyable.h" | 35 #include "wtf/Noncopyable.h" |
| 36 | 36 |
| 37 namespace blink { | 37 namespace blink { |
| 38 | 38 |
| 39 // ReverbAccumulationBuffer is a circular delay buffer with one client reading f
rom it and multiple clients | 39 // ReverbAccumulationBuffer is a circular delay buffer with one client reading |
| 40 // writing/accumulating to it at different delay offsets from the read position.
The read operation will zero the memory | 40 // from it and multiple clients writing/accumulating to it at different delay |
| 41 // just read from the buffer, so it will be ready for accumulation the next time
around. | 41 // offsets from the read position. The read operation will zero the memory |
| 42 // just read from the buffer, so it will be ready for accumulation the next |
| 43 // time around. |
| 42 class PLATFORM_EXPORT ReverbAccumulationBuffer { | 44 class PLATFORM_EXPORT ReverbAccumulationBuffer { |
| 43 DISALLOW_NEW(); | 45 DISALLOW_NEW(); |
| 44 WTF_MAKE_NONCOPYABLE(ReverbAccumulationBuffer); | 46 WTF_MAKE_NONCOPYABLE(ReverbAccumulationBuffer); |
| 45 | 47 |
| 46 public: | 48 public: |
| 47 ReverbAccumulationBuffer(size_t length); | 49 ReverbAccumulationBuffer(size_t length); |
| 48 | 50 |
| 49 // This will read from, then clear-out numberOfFrames | 51 // This will read from, then clear-out numberOfFrames |
| 50 void readAndClear(float* destination, size_t numberOfFrames); | 52 void readAndClear(float* destination, size_t numberOfFrames); |
| 51 | 53 |
| 52 // Each ReverbConvolverStage will accumulate its output at the appropriate del
ay from the read position. | 54 // Each ReverbConvolverStage will accumulate its output at the appropriate |
| 53 // We need to pass in and update readIndex here, since each ReverbConvolverSta
ge may be running in | 55 // delay from the read position. We need to pass in and update readIndex |
| 54 // a different thread than the realtime thread calling ReadAndClear() and main
taining m_readIndex | 56 // here, since each ReverbConvolverStage may be running in a different thread |
| 57 // than the realtime thread calling ReadAndClear() and maintaining |
| 58 // m_readIndex |
| 55 // Returns the writeIndex where the accumulation took place | 59 // Returns the writeIndex where the accumulation took place |
| 56 int accumulate(float* source, | 60 int accumulate(float* source, |
| 57 size_t numberOfFrames, | 61 size_t numberOfFrames, |
| 58 int* readIndex, | 62 int* readIndex, |
| 59 size_t delayFrames); | 63 size_t delayFrames); |
| 60 | 64 |
| 61 size_t readIndex() const { return m_readIndex; } | 65 size_t readIndex() const { return m_readIndex; } |
| 62 void updateReadIndex(int* readIndex, size_t numberOfFrames) const; | 66 void updateReadIndex(int* readIndex, size_t numberOfFrames) const; |
| 63 | 67 |
| 64 size_t readTimeFrame() const { return m_readTimeFrame; } | 68 size_t readTimeFrame() const { return m_readTimeFrame; } |
| 65 | 69 |
| 66 void reset(); | 70 void reset(); |
| 67 | 71 |
| 68 private: | 72 private: |
| 69 AudioFloatArray m_buffer; | 73 AudioFloatArray m_buffer; |
| 70 size_t m_readIndex; | 74 size_t m_readIndex; |
| 71 size_t m_readTimeFrame; // for debugging (frame on continuous timeline) | 75 size_t m_readTimeFrame; // for debugging (frame on continuous timeline) |
| 72 }; | 76 }; |
| 73 | 77 |
| 74 } // namespace blink | 78 } // namespace blink |
| 75 | 79 |
| 76 #endif // ReverbAccumulationBuffer_h | 80 #endif // ReverbAccumulationBuffer_h |
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