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
|
/*
* 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 "NullMixerListener.hxx"
#include "mixer/MixerControl.hxx"
#include "mixer/MixerList.hxx"
#include "filter/FilterRegistry.hxx"
#include "pcm/Volume.hxx"
#include "Main.hxx"
#include "event/Loop.hxx"
#include "config/Block.hxx"
#include "util/PrintException.hxx"
#include <assert.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
const FilterPlugin *
filter_plugin_by_name(gcc_unused const char *name) noexcept
{
assert(false);
return NULL;
}
int main(int argc, gcc_unused char **argv)
try {
int volume;
if (argc != 2) {
fprintf(stderr, "Usage: read_mixer PLUGIN\n");
return EXIT_FAILURE;
}
EventLoop event_loop;
NullMixerListener mixer_listener;
Mixer *mixer = mixer_new(event_loop, alsa_mixer_plugin,
/* ugly dangerous dummy pointer to
make the compiler happy; this
works with most mixers, because
they don't need the AudioOutput */
*(AudioOutput *)0x1,
mixer_listener,
ConfigBlock());
mixer_open(mixer);
volume = mixer_get_volume(mixer);
mixer_close(mixer);
mixer_free(mixer);
assert(volume >= -1 && volume <= 100);
if (volume < 0) {
fprintf(stderr, "failed to read volume\n");
return EXIT_FAILURE;
}
printf("%d\n", volume);
return 0;
} catch (...) {
PrintException(std::current_exception());
return EXIT_FAILURE;
}
|
