eswyft/alsa-volume-monitor
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This commit is contained in:
evgeny 2016-07-03 20:37:05 +03:00
parent 89e740b2d6
commit 71a71a2a99
1 changed files with 38 additions and 38 deletions
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76
main.c
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@ -32,78 +32,78 @@ int notify(DBusConnection *conn)
int open_ctl(const char *name, snd_ctl_t **ctlp)
{
snd_ctl_t *ctl;
int err;
snd_ctl_t *ctl;
int err;
err = snd_ctl_open(&ctl, name, SND_CTL_READONLY);
if (err < 0) {
fprintf(stderr, "Cannot open ctl %s\n", name);
return err;
}
err = snd_ctl_subscribe_events(ctl, 1);
if (err < 0) {
fprintf(stderr, "Cannot open subscribe events to ctl %s\n", name);
snd_ctl_close(ctl);
return err;
}
*ctlp = ctl;
return 0;
err = snd_ctl_open(&ctl, name, SND_CTL_READONLY);
if (err < 0) {
fprintf(stderr, "Cannot open ctl %s\n", name);
return err;
}
err = snd_ctl_subscribe_events(ctl, 1);
if (err < 0) {
fprintf(stderr, "Cannot open subscribe events to ctl %s\n", name);
snd_ctl_close(ctl);
return err;
}
*ctlp = ctl;
return 0;
}
int check_event(snd_ctl_t *ctl, DBusConnection *conn)
{
snd_ctl_event_t *event;
unsigned int mask;
int err;
snd_ctl_event_t *event;
unsigned int mask;
int err;
snd_ctl_event_alloca(&event);
err = snd_ctl_read(ctl, event);
if (err < 0)
return err;
snd_ctl_event_alloca(&event);
err = snd_ctl_read(ctl, event);
if (err < 0)
return err;
if (snd_ctl_event_get_type(event) != SND_CTL_EVENT_ELEM)
return 0;
if (snd_ctl_event_get_type(event) != SND_CTL_EVENT_ELEM)
return 0;
mask = snd_ctl_event_elem_get_mask(event);
if (!(mask & SND_CTL_EVENT_MASK_VALUE))
return 0;
notify(conn);
return 0;
return 0;
}
#define MAX_CARDS 256
#define MAX_CARDS 256
int monitor(const char *name, DBusConnection *conn) {
snd_ctl_t *ctl;
int err = 0;
int err = 0;
err = open_ctl(name, &ctl);
if (err < 0)
goto error;
while (1) {
struct pollfd fd;
struct pollfd fd;
snd_ctl_poll_descriptors(ctl, &fd, 1);
snd_ctl_poll_descriptors(ctl, &fd, 1);
err = poll(&fd, 1, -1);
if (err <= 0) {
err = 0;
break;
}
err = poll(&fd, 1, -1);
if (err <= 0) {
err = 0;
break;
}
unsigned short revents;
snd_ctl_poll_descriptors_revents(ctl, &fd, 1,
&revents);
if (revents & POLLIN)
check_event(ctl, conn);
}
}
error:
snd_ctl_close(ctl);
return err;
snd_ctl_close(ctl);
return err;
}
void usage()