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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/memory/scoped_vector.h" | 8 #include "base/memory/scoped_vector.h" |
9 #include "media/base/audio_bus.h" | 9 #include "media/base/audio_bus.h" |
10 #include "media/base/media_export.h" | 10 #include "media/base/media_export.h" |
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21 // Creates a new AudioBlockFifo and allocates |blocks| memory, each block | 21 // Creates a new AudioBlockFifo and allocates |blocks| memory, each block |
22 // of memory can store |channels| of length |frames| data. | 22 // of memory can store |channels| of length |frames| data. |
23 AudioBlockFifo(int channels, int frames, int blocks); | 23 AudioBlockFifo(int channels, int frames, int blocks); |
24 virtual ~AudioBlockFifo(); | 24 virtual ~AudioBlockFifo(); |
25 | 25 |
26 // Pushes interleaved audio data from |source| to the FIFO. | 26 // Pushes interleaved audio data from |source| to the FIFO. |
27 // The method will deinterleave the data into a audio bus. | 27 // The method will deinterleave the data into a audio bus. |
28 // Push() will crash if the allocated space is insufficient. | 28 // Push() will crash if the allocated space is insufficient. |
29 void Push(const void* source, int frames, int bytes_per_sample); | 29 void Push(const void* source, int frames, int bytes_per_sample); |
30 | 30 |
| 31 // Pushes the audio data from |source| to the FIFO. |
| 32 // Push() will crash if the allocated space is insufficient. |
| 33 void Push(const AudioBus* source); |
| 34 |
31 // Consumes a block of audio from the FIFO. Returns an AudioBus which | 35 // Consumes a block of audio from the FIFO. Returns an AudioBus which |
32 // contains the consumed audio data to avoid copying. | 36 // contains the consumed audio data to avoid copying. |
33 // Consume() will crash if the FIFO does not contain a block of data. | 37 // Consume() will crash if the FIFO does not contain a block of data. |
34 const AudioBus* Consume(); | 38 const AudioBus* Consume(); |
35 | 39 |
36 // Empties the FIFO without deallocating any memory. | 40 // Empties the FIFO without deallocating any memory. |
37 void Clear(); | 41 void Clear(); |
38 | 42 |
39 // Number of available block of memory ready to be consumed in the FIFO. | 43 // Number of available block of memory ready to be consumed in the FIFO. |
40 int available_blocks() const { return available_blocks_; } | 44 int available_blocks() const { return available_blocks_; } |
41 | 45 |
42 // Number of available frames of data in the FIFO. | 46 // Number of available frames of data in the FIFO. |
43 int GetAvailableFrames() const; | 47 int GetAvailableFrames() const; |
44 | 48 |
45 // Number of unfilled frames in the whole FIFO. | 49 // Number of unfilled frames in the whole FIFO. |
46 int GetUnfilledFrames() const; | 50 int GetUnfilledFrames() const; |
47 | 51 |
48 private: | 52 private: |
| 53 // Helper method to update the indexes in Push methods. |
| 54 void UpdatePosition(int push_frames); |
| 55 |
49 // The actual FIFO is a vector of audio buses. | 56 // The actual FIFO is a vector of audio buses. |
50 ScopedVector<AudioBus> audio_blocks_; | 57 ScopedVector<AudioBus> audio_blocks_; |
51 | 58 |
52 // Maximum number of frames of data one block of memory can contain. | 59 // Maximum number of frames of data one block of memory can contain. |
53 // This value is set by |frames| in the constructor. | 60 // This value is set by |frames| in the constructor. |
54 const int block_frames_; | 61 const int block_frames_; |
55 | 62 |
56 // Used to keep track which block of memory to be written. | 63 // Used to keep track which block of memory to be written. |
57 int write_block_; | 64 int write_block_; |
58 | 65 |
59 // Used to keep track which block of memory to be consumed. | 66 // Used to keep track which block of memory to be consumed. |
60 int read_block_; | 67 int read_block_; |
61 | 68 |
62 // Number of available blocks of memory to be consumed. | 69 // Number of available blocks of memory to be consumed. |
63 int available_blocks_; | 70 int available_blocks_; |
64 | 71 |
65 // Current write position in the current written block. | 72 // Current write position in the current written block. |
66 int write_pos_; | 73 int write_pos_; |
67 | 74 |
68 DISALLOW_COPY_AND_ASSIGN(AudioBlockFifo); | 75 DISALLOW_COPY_AND_ASSIGN(AudioBlockFifo); |
69 }; | 76 }; |
70 | 77 |
71 } // namespace media | 78 } // namespace media |
72 | 79 |
73 #endif // MEDIA_BASE_AUDIO_BLOCK_FIFO_H_ | 80 #endif // MEDIA_BASE_AUDIO_BLOCK_FIFO_H_ |
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