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
/*
* Copyright 2003-2018 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 "MixerControl.hxx"
#include "MixerInternal.hxx"
#include <assert.h>
Mixer *
mixer_new(EventLoop &event_loop,
const MixerPlugin &plugin, AudioOutput &ao,
MixerListener &listener,
const ConfigBlock &block)
{
Mixer *mixer = plugin.init(event_loop, ao, listener, block);
assert(mixer == nullptr || mixer->IsPlugin(plugin));
return mixer;
}
void
mixer_free(Mixer *mixer)
{
assert(mixer != nullptr);
/* mixers with the "global" flag set might still be open at
this point (see mixer_auto_close()) */
mixer_close(mixer);
delete mixer;
}
void
mixer_open(Mixer *mixer)
{
assert(mixer != nullptr);
const std::lock_guard<Mutex> protect(mixer->mutex);
if (mixer->open)
return;
try {
mixer->Open();
mixer->open = true;
mixer->failed = false;
} catch (...) {
mixer->failed = true;
throw;
}
}
static void
mixer_close_internal(Mixer *mixer)
{
assert(mixer != nullptr);
assert(mixer->open);
mixer->Close();
mixer->open = false;
}
void
mixer_close(Mixer *mixer)
{
assert(mixer != nullptr);
const std::lock_guard<Mutex> protect(mixer->mutex);
if (mixer->open)
mixer_close_internal(mixer);
}
void
mixer_auto_close(Mixer *mixer)
{
if (!mixer->plugin.global)
mixer_close(mixer);
}
/*
* Close the mixer due to failure. The mutex must be locked before
* calling this function.
*/
static void
mixer_failed(Mixer *mixer)
{
assert(mixer->open);
mixer_close_internal(mixer);
mixer->failed = true;
}
int
mixer_get_volume(Mixer *mixer)
{
int volume;
assert(mixer != nullptr);
if (mixer->plugin.global && !mixer->failed)
mixer_open(mixer);
const std::lock_guard<Mutex> protect(mixer->mutex);
if (mixer->open) {
try {
volume = mixer->GetVolume();
} catch (...) {
mixer_failed(mixer);
throw;
}
} else
volume = -1;
return volume;
}
void
mixer_set_volume(Mixer *mixer, unsigned volume)
{
assert(mixer != nullptr);
assert(volume <= 100);
if (mixer->plugin.global && !mixer->failed)
mixer_open(mixer);
const std::lock_guard<Mutex> protect(mixer->mutex);
if (mixer->open)
mixer->SetVolume(volume);
}