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af_volume.h
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 /**
20  * @file
21  * audio volume filter
22  */
23 
24 #ifndef AVFILTER_AF_VOLUME_H
25 #define AVFILTER_AF_VOLUME_H
26 
27 #include "libavutil/common.h"
28 #include "libavutil/eval.h"
29 #include "libavutil/float_dsp.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/samplefmt.h"
32 
37 };
38 
39 enum EvalMode {
43 };
44 
59 };
60 
66 };
67 
68 typedef struct VolumeContext {
69  const AVClass *class;
71  int precision;
72  int eval_mode;
73  const char *volume_expr;
76 
80  double volume;
81  int volume_i;
82  int channels;
83  int planes;
85 
86  void (*scale_samples)(uint8_t *dst, const uint8_t *src, int nb_samples,
87  int volume);
90 
92 
93 #endif /* AVFILTER_AF_VOLUME_H */