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
|
/*
* Copyright (C) 2003-2013 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 "VolumeFilterPlugin.hxx"
#include "FilterPlugin.hxx"
#include "FilterInternal.hxx"
#include "FilterRegistry.hxx"
#include "conf.h"
#include "pcm_buffer.h"
#include "PcmVolume.hxx"
#include "audio_format.h"
#include <assert.h>
#include <string.h>
struct volume_filter {
struct filter filter;
/**
* The current volume, from 0 to #PCM_VOLUME_1.
*/
unsigned volume;
struct audio_format audio_format;
struct pcm_buffer buffer;
};
static inline GQuark
volume_quark(void)
{
return g_quark_from_static_string("pcm_volume");
}
static struct filter *
volume_filter_init(G_GNUC_UNUSED const struct config_param *param,
G_GNUC_UNUSED GError **error_r)
{
struct volume_filter *filter = g_new(struct volume_filter, 1);
filter_init(&filter->filter, &volume_filter_plugin);
filter->volume = PCM_VOLUME_1;
return &filter->filter;
}
static void
volume_filter_finish(struct filter *filter)
{
g_free(filter);
}
static const struct audio_format *
volume_filter_open(struct filter *_filter, struct audio_format *audio_format,
G_GNUC_UNUSED GError **error_r)
{
struct volume_filter *filter = (struct volume_filter *)_filter;
filter->audio_format = *audio_format;
pcm_buffer_init(&filter->buffer);
return &filter->audio_format;
}
static void
volume_filter_close(struct filter *_filter)
{
struct volume_filter *filter = (struct volume_filter *)_filter;
pcm_buffer_deinit(&filter->buffer);
}
static const void *
volume_filter_filter(struct filter *_filter, const void *src, size_t src_size,
size_t *dest_size_r, GError **error_r)
{
struct volume_filter *filter = (struct volume_filter *)_filter;
bool success;
void *dest;
*dest_size_r = src_size;
if (filter->volume >= PCM_VOLUME_1)
/* optimized special case: 100% volume = no-op */
return src;
dest = pcm_buffer_get(&filter->buffer, src_size);
if (filter->volume <= 0) {
/* optimized special case: 0% volume = memset(0) */
/* XXX is this valid for all sample formats? What
about floating point? */
memset(dest, 0, src_size);
return dest;
}
memcpy(dest, src, src_size);
success = pcm_volume(dest, src_size,
sample_format(filter->audio_format.format),
filter->volume);
if (!success) {
g_set_error(error_r, volume_quark(), 0,
"pcm_volume() has failed");
return NULL;
}
return dest;
}
const struct filter_plugin volume_filter_plugin = {
"volume",
volume_filter_init,
volume_filter_finish,
volume_filter_open,
volume_filter_close,
volume_filter_filter,
};
unsigned
volume_filter_get(const struct filter *_filter)
{
const struct volume_filter *filter =
(const struct volume_filter *)_filter;
assert(filter->filter.plugin == &volume_filter_plugin);
assert(filter->volume <= PCM_VOLUME_1);
return filter->volume;
}
void
volume_filter_set(struct filter *_filter, unsigned volume)
{
struct volume_filter *filter = (struct volume_filter *)_filter;
assert(filter->filter.plugin == &volume_filter_plugin);
assert(volume <= PCM_VOLUME_1);
filter->volume = volume;
}
|
