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
|
#include <alsa/asoundlib.h>
#include <alsa/mixer.h>
#include <limits.h>
#include "../util.h"
// https://stackoverflow.com/questions/7657624/get-master-sound-volume-in-c-in-linux
const char *vol_pulse(void)
{
snd_mixer_t *handle;
snd_mixer_elem_t *elem;
snd_mixer_selem_id_t *sid;
static const char *mix_name = "Master";
static const char *card = "default";
static int mix_index = 0;
static const char *notfound = "n/a";
snd_mixer_selem_id_alloca(&sid);
snd_mixer_selem_id_set_index(sid, mix_index);
snd_mixer_selem_id_set_name(sid, mix_name);
if ((snd_mixer_open(&handle, 0)) < 0) {
fprintf(stderr, "could not open mixer\n");
return notfound;
}
if ((snd_mixer_attach(handle, card)) < 0) {
snd_mixer_close(handle);
fprintf(stderr, "could not open card %s\n", card);
return notfound;
}
if ((snd_mixer_selem_register(handle, NULL, NULL)) < 0) {
snd_mixer_close(handle);
fprintf(stderr, "could not register selem\n");
return notfound;
}
int ret = snd_mixer_load(handle);
if (ret < 0) {
snd_mixer_close(handle);
fprintf(stderr, "could not load mixer\n");
return notfound;
}
elem = snd_mixer_find_selem(handle, sid);
if (!elem) {
snd_mixer_close(handle);
fprintf(stderr, "could not find selem with index=%d, name=%s\n", mix_index, mix_name);
return notfound;
}
long minv, maxv;
long outvol;
int muted;
snd_mixer_selem_get_playback_volume_range(elem, &minv, &maxv);
if(snd_mixer_selem_get_playback_volume(elem, 0, &outvol) < 0) {
fprintf(stderr, "could not read output volume\n");
snd_mixer_close(handle);
return notfound;
}
if(snd_mixer_selem_get_playback_switch(elem, 0, &muted) < 0) {
fprintf(stderr, "could not read mute output\n");
snd_mixer_close(handle);
return notfound;
}
snd_mixer_close(handle);
return bprintf("%0.0f%s", ((float)outvol / (float)maxv) * 100, muted ? "" : "M");
}
|
