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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef MEDIA_BASE_AUDIO_BLOCK_FIFO_H_ | 5 #ifndef MEDIA_BASE_AUDIO_BLOCK_FIFO_H_ |
6 #define MEDIA_BASE_AUDIO_BLOCK_FIFO_H_ | 6 #define MEDIA_BASE_AUDIO_BLOCK_FIFO_H_ |
7 | 7 |
8 #include "base/macros.h" | 8 #include "base/macros.h" |
9 #include "base/memory/scoped_vector.h" | |
10 #include "media/base/audio_bus.h" | 9 #include "media/base/audio_bus.h" |
11 #include "media/base/media_export.h" | 10 #include "media/base/media_export.h" |
12 | 11 |
13 namespace media { | 12 namespace media { |
14 | 13 |
15 // First-in first-out container for AudioBus elements. | 14 // First-in first-out container for AudioBus elements. |
16 // The FIFO is composed of blocks of AudioBus elements, it accepts interleaved | 15 // The FIFO is composed of blocks of AudioBus elements, it accepts interleaved |
17 // data as input and will deinterleave it into the FIFO, and it only allows | 16 // data as input and will deinterleave it into the FIFO, and it only allows |
18 // consuming a whole block of AudioBus element. | 17 // consuming a whole block of AudioBus element. |
19 // This class is thread-unsafe. | 18 // This class is thread-unsafe. |
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52 // Dynamically increase |blocks| of memory to the FIFO. | 51 // Dynamically increase |blocks| of memory to the FIFO. |
53 void IncreaseCapacity(int blocks); | 52 void IncreaseCapacity(int blocks); |
54 | 53 |
55 private: | 54 private: |
56 // Common implementation for Push() and PushSilence. if |source| is nullptr, | 55 // Common implementation for Push() and PushSilence. if |source| is nullptr, |
57 // silence will be pushed. To push silence, set source and bytes_per_sample to | 56 // silence will be pushed. To push silence, set source and bytes_per_sample to |
58 // nullptr and 0 respectively. | 57 // nullptr and 0 respectively. |
59 void PushInternal(const void* source, int frames, int bytes_per_sample); | 58 void PushInternal(const void* source, int frames, int bytes_per_sample); |
60 | 59 |
61 // The actual FIFO is a vector of audio buses. | 60 // The actual FIFO is a vector of audio buses. |
62 ScopedVector<AudioBus> audio_blocks_; | 61 std::vector<std::unique_ptr<AudioBus>> audio_blocks_; |
63 | 62 |
64 // Number of channels in AudioBus. | 63 // Number of channels in AudioBus. |
65 const int channels_; | 64 const int channels_; |
66 | 65 |
67 // Maximum number of frames of data one block of memory can contain. | 66 // Maximum number of frames of data one block of memory can contain. |
68 // This value is set by |frames| in the constructor. | 67 // This value is set by |frames| in the constructor. |
69 const int block_frames_; | 68 const int block_frames_; |
70 | 69 |
71 // Used to keep track which block of memory to be written. | 70 // Used to keep track which block of memory to be written. |
72 int write_block_; | 71 int write_block_; |
73 | 72 |
74 // Used to keep track which block of memory to be consumed. | 73 // Used to keep track which block of memory to be consumed. |
75 int read_block_; | 74 int read_block_; |
76 | 75 |
77 // Number of available blocks of memory to be consumed. | 76 // Number of available blocks of memory to be consumed. |
78 int available_blocks_; | 77 int available_blocks_; |
79 | 78 |
80 // Current write position in the current written block. | 79 // Current write position in the current written block. |
81 int write_pos_; | 80 int write_pos_; |
82 | 81 |
83 DISALLOW_COPY_AND_ASSIGN(AudioBlockFifo); | 82 DISALLOW_COPY_AND_ASSIGN(AudioBlockFifo); |
84 }; | 83 }; |
85 | 84 |
86 } // namespace media | 85 } // namespace media |
87 | 86 |
88 #endif // MEDIA_BASE_AUDIO_BLOCK_FIFO_H_ | 87 #endif // MEDIA_BASE_AUDIO_BLOCK_FIFO_H_ |
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