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Side by Side Diff: third_party/WebKit/Source/platform/audio/ReverbAccumulationBuffer.h

Issue 2384073002: reflow comments in platform/audio (Closed)
Patch Set: comments (heh!) Created 4 years, 2 months ago
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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
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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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