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
|
/*
* Copyright (C) 2003-2010 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "replay_gain_state.h"
#include "pcm_volume.h"
#include <glib.h>
#include <assert.h>
#include <math.h>
struct replay_gain_state {
float preamp, missing_preamp;
enum replay_gain_mode mode;
struct replay_gain_info *info;
float scale;
};
struct replay_gain_state *
replay_gain_state_new(float preamp, float missing_preamp)
{
struct replay_gain_state *state = g_new(struct replay_gain_state, 1);
state->preamp = preamp;
state->missing_preamp = missing_preamp;
state->mode = REPLAY_GAIN_OFF;
state->info = NULL;
return state;
}
void
replay_gain_state_free(struct replay_gain_state *state)
{
assert(state != NULL);
if (state->info != NULL)
replay_gain_info_free(state->info);
g_free(state);
}
static float
calc_replay_gain_scale(float gain, float peak, float preamp)
{
float scale;
if (gain == 0.0)
return (1);
scale = pow(10.0, gain / 20.0);
scale *= preamp;
if (scale > 15.0)
scale = 15.0;
if (scale * peak > 1.0) {
scale = 1.0 / peak;
}
return (scale);
}
static void
replay_gain_state_calc_scale(struct replay_gain_state *state)
{
assert(state != NULL);
if (state->mode == REPLAY_GAIN_OFF || state->info == NULL)
return;
const struct replay_gain_tuple *tuple =
&state->info->tuples[state->mode];
g_debug("computing ReplayGain scale with gain %f, peak %f",
tuple->gain, tuple->peak);
state->scale = calc_replay_gain_scale(tuple->gain, tuple->peak,
state->preamp);
}
void
replay_gain_state_set_mode(struct replay_gain_state *state,
enum replay_gain_mode mode)
{
assert(state != NULL);
if (mode == state->mode)
return;
state->mode = mode;
replay_gain_state_calc_scale(state);
}
void
replay_gain_state_set_info(struct replay_gain_state *state,
const struct replay_gain_info *info)
{
assert(state != NULL);
if (state->info != NULL)
replay_gain_info_free(state->info);
state->info = info != NULL
? replay_gain_info_dup(info)
: NULL;
replay_gain_state_calc_scale(state);
}
void
replay_gain_state_apply(const struct replay_gain_state *state,
void *buffer, size_t size,
const struct audio_format *format)
{
assert(state != NULL);
if (state->mode == REPLAY_GAIN_OFF)
return;
float scale = state->info != NULL
? state->scale : state->missing_preamp;
pcm_volume(buffer, size, format, pcm_float_to_volume(scale));
}
|
