OLD | NEW |
---|---|
(Empty) | |
1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef MEDIA_BASE_AUDIO_FIFO_H_ | |
6 #define MEDIA_BASE_AUDIO_FIFO_H_ | |
7 | |
8 #include "media/base/audio_bus.h" | |
9 #include "media/base/media_export.h" | |
10 | |
11 namespace media { | |
12 | |
13 // First-in first-out container for AudioBus elements. | |
14 // The maximum number of audio frames in the FIFO is set at construction and | |
15 // can not be extended dynamically. The allocated memory is utilized as a | |
16 // ring buffer. | |
17 class MEDIA_EXPORT AudioFifo { | |
18 public: | |
19 // Creates a new AudioFifo and allocates |channels| of length |frames|. | |
20 AudioFifo(int channels, int frames); | |
21 virtual ~AudioFifo(); | |
22 | |
23 // Pushes all audio channel data from |source| to the FIFO. | |
24 // Returns false if the allocated space is not sufficient. Partial data is | |
25 // not written to the FIFO for this overflow case. | |
26 bool Push(const AudioBus* source); | |
27 | |
28 // Consumes |frames_to_consume| audio frames from the FIFO and copies | |
29 // them to |destination|. | |
30 // Returns false if the FIFO does not contain |frames_to_consume| frames | |
31 // or if there is not sufficient space in |destination| to store the frames. | |
32 bool Consume(AudioBus* destination, int frames_to_consume); | |
scherkus (not reviewing)
2012/09/06 13:53:57
are callees expected to check their own size / fra
henrika (OOO until Aug 14)
2012/09/07 14:10:37
Are you suggesting that I modify to void and add C
| |
33 | |
34 // Empties the FIFO without deallocating any memory. | |
35 void Clear(); | |
36 | |
37 // Number of actual audio bus frames in the FIFO. | |
38 int frames_in_fifo() const { return frames_in_fifo_; } | |
scherkus (not reviewing)
2012/09/06 13:53:57
s/frames_in_fifo/frames/ ?
we're using a FIFO obj
henrika (OOO until Aug 14)
2012/09/07 14:10:37
LOL, that's my melody as well but not all reviewer
| |
39 | |
40 private: | |
41 int max_frames() const { return max_frames_in_fifo_; } | |
42 | |
43 // The actual FIFO is an audio bus implemented as a ring buffer. | |
44 scoped_ptr<AudioBus> audio_bus_; | |
45 | |
46 // Maximum number of elements the FIFO can contain. | |
47 // This value is set by |frames| in the constructor. | |
48 const int max_frames_in_fifo_; | |
49 | |
50 // Number of actual elements in the FIFO. | |
51 int frames_in_fifo_; | |
52 | |
53 // Current read position. | |
54 int read_pos_; | |
55 | |
56 // Current write position. | |
57 int write_pos_; | |
58 | |
59 DISALLOW_COPY_AND_ASSIGN(AudioFifo); | |
60 }; | |
61 | |
62 } // namespace media | |
63 | |
64 #endif // MEDIA_BASE_AUDIO_FIFO_H_ | |
OLD | NEW |