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
|
/*
* Copyright (C) 2003-2014 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 "SoftwareMixerPlugin.hxx"
#include "mixer/MixerInternal.hxx"
#include "filter/FilterPlugin.hxx"
#include "filter/FilterRegistry.hxx"
#include "filter/FilterInternal.hxx"
#include "filter/plugins/VolumeFilterPlugin.hxx"
#include "pcm/Volume.hxx"
#include "config/ConfigData.hxx"
#include "util/Error.hxx"
#include <assert.h>
#include <math.h>
static Filter *
CreateVolumeFilter()
{
Error error;
return filter_new(&volume_filter_plugin, config_param(), error);
}
struct SoftwareMixer final : public Mixer {
Filter *filter;
/**
* If this is true, then this object "owns" the #Filter
* instance (see above). It will be set to false by
* software_mixer_get_filter(); after that, the caller will be
* responsible for the #Filter.
*/
bool owns_filter;
unsigned volume;
SoftwareMixer()
:Mixer(software_mixer_plugin),
filter(CreateVolumeFilter()),
owns_filter(true),
volume(100)
{
assert(filter != nullptr);
}
~SoftwareMixer() {
if (owns_filter)
delete filter;
}
};
static Mixer *
software_mixer_init(gcc_unused void *ao,
gcc_unused const config_param ¶m,
gcc_unused Error &error)
{
return new SoftwareMixer();
}
static void
software_mixer_finish(Mixer *data)
{
SoftwareMixer *sm = (SoftwareMixer *)data;
delete sm;
}
static int
software_mixer_get_volume(Mixer *mixer, gcc_unused Error &error)
{
SoftwareMixer *sm = (SoftwareMixer *)mixer;
return sm->volume;
}
static bool
software_mixer_set_volume(Mixer *mixer, unsigned volume,
gcc_unused Error &error)
{
SoftwareMixer *sm = (SoftwareMixer *)mixer;
assert(volume <= 100);
sm->volume = volume;
if (volume >= 100)
volume = PCM_VOLUME_1;
else if (volume > 0)
volume = pcm_float_to_volume((exp(volume / 25.0) - 1) /
(54.5981500331F - 1));
volume_filter_set(sm->filter, volume);
return true;
}
const struct mixer_plugin software_mixer_plugin = {
software_mixer_init,
software_mixer_finish,
nullptr,
nullptr,
software_mixer_get_volume,
software_mixer_set_volume,
true,
};
Filter *
software_mixer_get_filter(Mixer *mixer)
{
SoftwareMixer *sm = (SoftwareMixer *)mixer;
assert(sm->IsPlugin(software_mixer_plugin));
assert(sm->owns_filter);
sm->owns_filter = false;
return sm->filter;
}
|
