1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
/*
Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file src/lib/audio_buffers.h
* @brief AudioBuffers class.
*/
#ifndef DCPOMATIC_AUDIO_BUFFERS_H
#define DCPOMATIC_AUDIO_BUFFERS_H
#include <stdint.h>
#include <memory>
/** @class AudioBuffers
* @brief A class to hold multi-channel audio data in float format.
*
* The use of int32_t for frame counts in this class is due to the
* round-up to the next power-of-2 code in ensure_size(); if that
* were changed the frame count could use any integer type.
*/
class AudioBuffers
{
public:
AudioBuffers (int channels, int32_t frames);
AudioBuffers (AudioBuffers const &);
explicit AudioBuffers (std::shared_ptr<const AudioBuffers>);
AudioBuffers (std::shared_ptr<const AudioBuffers> other, int32_t frames_to_copy, int32_t read_offset);
~AudioBuffers ();
AudioBuffers & operator= (AudioBuffers const &);
std::shared_ptr<AudioBuffers> clone () const;
std::shared_ptr<AudioBuffers> channel (int) const;
void ensure_size (int32_t);
float** data () const {
return _data;
}
float* data (int) const;
int channels () const {
return _channels;
}
int frames () const {
return _frames;
}
void set_frames (int32_t f);
void make_silent ();
void make_silent (int c);
void make_silent (int32_t from, int32_t frames);
void apply_gain (float);
void copy_from (AudioBuffers const * from, int32_t frames_to_copy, int32_t read_offset, int32_t write_offset);
void copy_channel_from (AudioBuffers const * from, int from_channel, int to_channel);
void move (int32_t frames, int32_t from, int32_t to);
void accumulate_channel (AudioBuffers const * from, int from_channel, int to_channel, float gain = 1);
void accumulate_frames (AudioBuffers const * from, int32_t frames, int32_t read_offset, int32_t write_offset);
void append (std::shared_ptr<const AudioBuffers> other);
void trim_start (int32_t frames);
void trim_end (int32_t frames);
private:
void allocate (int channels, int32_t frames);
void deallocate ();
/** Number of channels */
int _channels;
/** Number of frames (where a frame is one sample across all channels) */
int32_t _frames;
/** Number of frames that _data can hold */
int32_t _allocated_frames;
/** Audio data (so that, e.g. _data[2][6] is channel 2, sample 6) */
float** _data;
};
#endif
|
