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
33enum PrecisionType {
34    PRECISION_FIXED = 0,
35    PRECISION_FLOAT,
36    PRECISION_DOUBLE,
37};
38
39enum EvalMode {
40    EVAL_MODE_ONCE,
41    EVAL_MODE_FRAME,
42    EVAL_MODE_NB
43};
44
45enum VolumeVarName {
46    VAR_N,
47    VAR_NB_CHANNELS,
48    VAR_NB_CONSUMED_SAMPLES,
49    VAR_NB_SAMPLES,
50    VAR_POS,
51    VAR_PTS,
52    VAR_SAMPLE_RATE,
53    VAR_STARTPTS,
54    VAR_STARTT,
55    VAR_T,
56    VAR_TB,
57    VAR_VOLUME,
58    VAR_VARS_NB
59};
60
61enum ReplayGainType {
62    REPLAYGAIN_DROP,
63    REPLAYGAIN_IGNORE,
64    REPLAYGAIN_TRACK,
65    REPLAYGAIN_ALBUM,
66};
67
68typedef struct VolumeContext {
69    const AVClass *class;
70    AVFloatDSPContext fdsp;
71    enum PrecisionType precision;
72    enum EvalMode eval_mode;
73    const char *volume_expr;
74    AVExpr *volume_pexpr;
75    double var_values[VAR_VARS_NB];
76
77    enum ReplayGainType replaygain;
78    double replaygain_preamp;
79    int    replaygain_noclip;
80    double volume;
81    int    volume_i;
82    int    channels;
83    int    planes;
84    enum AVSampleFormat sample_fmt;
85
86    void (*scale_samples)(uint8_t *dst, const uint8_t *src, int nb_samples,
87                          int volume);
88    int samples_align;
89} VolumeContext;
90
91void ff_volume_init_x86(VolumeContext *vol);
92
93#endif /* AVFILTER_AF_VOLUME_H */
94