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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
/*
* Copyright (C)2002 Anders Johansson ajh@atri.curtin.edu.au
*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <math.h>
#include <limits.h>
#include "common/common.h"
#include "af.h"
#include "demux/demux.h"
struct priv {
float level; // User-specified gain level for each channel
float rgain; // Replaygain level
int rgain_track; // Enable/disable track based replaygain
int rgain_album; // Enable/disable album based replaygain
float rgain_preamp; // Set replaygain pre-amplification
int rgain_clip; // Enable/disable clipping prevention
int soft; // Enable/disable soft clipping
int fast; // Use fix-point volume control
int detach; // Detach if gain volume is neutral
float cfg_volume;
};
static int control(struct af_instance *af, int cmd, void *arg)
{
struct priv *s = af->priv;
switch (cmd) {
case AF_CONTROL_REINIT: {
struct mp_audio *in = arg;
mp_audio_copy_config(af->data, in);
mp_audio_force_interleaved_format(af->data);
if (s->fast && af_fmt_from_planar(in->format) != AF_FORMAT_FLOAT) {
mp_audio_set_format(af->data, AF_FORMAT_S16);
} else {
mp_audio_set_format(af->data, AF_FORMAT_FLOAT);
}
if (AF_FORMAT_IS_PLANAR(in->format))
mp_audio_set_format(af->data, af_fmt_to_planar(af->data->format));
s->rgain = 1.0;
if ((s->rgain_track || s->rgain_album) && af->replaygain_data) {
float gain, peak;
if (s->rgain_track) {
gain = af->replaygain_data->track_gain;
peak = af->replaygain_data->track_peak;
} else {
gain = af->replaygain_data->album_gain;
peak = af->replaygain_data->album_peak;
}
gain += s->rgain_preamp;
af_from_dB(1, &gain, &s->rgain, 20.0, -200.0, 60.0);
MP_VERBOSE(af, "Applying replay-gain: %f\n", s->rgain);
if (!s->rgain_clip) { // clipping prevention
s->rgain = MPMIN(s->rgain, 1.0 / peak);
MP_VERBOSE(af, "...with clipping prevention: %f\n", s->rgain);
}
}
if (s->detach && fabs(s->level * s->rgain - 1.0) < 0.00001)
return AF_DETACH;
return af_test_output(af, in);
}
case AF_CONTROL_SET_VOLUME:
s->level = *(float *)arg;
return AF_OK;
case AF_CONTROL_GET_VOLUME:
*(float *)arg = s->level;
return AF_OK;
}
return AF_UNKNOWN;
}
static void filter_plane(struct af_instance *af, struct mp_audio *data, int p)
{
struct priv *s = af->priv;
float level = s->level * s->rgain;
int num_samples = data->samples * data->spf;
if (af_fmt_from_planar(af->data->format) == AF_FORMAT_S16) {
int vol = 256.0 * level;
if (vol != 256) {
if (af_make_writeable(af, data) < 0)
return; // oom
int16_t *a = data->planes[p];
for (int i = 0; i < num_samples; i++) {
int x = (a[i] * vol) >> 8;
a[i] = MPCLAMP(x, SHRT_MIN, SHRT_MAX);
}
}
} else if (af_fmt_from_planar(af->data->format) == AF_FORMAT_FLOAT) {
float vol = level;
if (vol != 1.0) {
if (af_make_writeable(af, data) < 0)
return; // oom
float *a = data->planes[p];
for (int i = 0; i < num_samples; i++) {
float x = a[i] * vol;
a[i] = s->soft ? af_softclip(x) : MPCLAMP(x, -1.0, 1.0);
}
}
}
}
static int filter(struct af_instance *af, struct mp_audio *data)
{
if (data) {
for (int n = 0; n < data->num_planes; n++)
filter_plane(af, data, n);
af_add_output_frame(af, data);
}
return 0;
}
static int af_open(struct af_instance *af)
{
struct priv *s = af->priv;
af->control = control;
af->filter_frame = filter;
af_from_dB(1, &s->cfg_volume, &s->level, 20.0, -200.0, 60.0);
return AF_OK;
}
#define OPT_BASE_STRUCT struct priv
// Description of this filter
const struct af_info af_info_volume = {
.info = "Volume control audio filter",
.name = "volume",
.flags = AF_FLAGS_NOT_REENTRANT,
.open = af_open,
.priv_size = sizeof(struct priv),
.options = (const struct m_option[]) {
OPT_FLOATRANGE("volumedb", cfg_volume, 0, -200, 60),
OPT_FLAG("replaygain-track", rgain_track, 0),
OPT_FLAG("replaygain-album", rgain_album, 0),
OPT_FLOATRANGE("replaygain-preamp", rgain_preamp, 0, -15, 15),
OPT_FLAG("replaygain-clip", rgain_clip, 0),
OPT_FLAG("softclip", soft, 0),
OPT_FLAG("s16", fast, 0),
OPT_FLAG("detach", detach, 0),
{0}
},
};
|
