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alsactl: monitor all cards as default

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Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2013-11-26 14:27:30 +01:00
parent bb3293c76e
commit 5dfc232a9d
2 changed files with 106 additions and 39 deletions
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5
alsactl/alsactl.1
View file

@ -39,9 +39,8 @@ rescan, save_and_quit).
\fImonitor\fP is for monitoring the events received from the given
control device.
If no soundcards are specified, setup for all cards will be saved or
loaded (except for \fImonitor\fP command that can handle only a single
card; it selects the card "default" when unspecified).
If no soundcards are specified, setup for all cards will be saved,
loaded or monitored.
.SH OPTIONS

140
alsactl/monitor.c
View file

@ -22,15 +22,11 @@
#include <stdio.h>
#include <alsa/asoundlib.h>
int monitor(const char *name)
static int open_ctl(const char *name, snd_ctl_t **ctlp)
{
snd_ctl_t *ctl;
snd_ctl_event_t *event;
int err;
if (!name)
name = "default";
err = snd_ctl_open(&ctl, name, SND_CTL_READONLY);
if (err < 0) {
fprintf(stderr, "Cannot open ctl %s\n", name);
@ -42,36 +38,108 @@ int monitor(const char *name)
snd_ctl_close(ctl);
return err;
}
snd_ctl_event_alloca(&event);
while (snd_ctl_read(ctl, event) > 0) {
unsigned int mask;
if (snd_ctl_event_get_type(event) != SND_CTL_EVENT_ELEM)
continue;
printf("#%d (%i,%i,%i,%s,%i)",
snd_ctl_event_elem_get_numid(event),
snd_ctl_event_elem_get_interface(event),
snd_ctl_event_elem_get_device(event),
snd_ctl_event_elem_get_subdevice(event),
snd_ctl_event_elem_get_name(event),
snd_ctl_event_elem_get_index(event));
mask = snd_ctl_event_elem_get_mask(event);
if (mask == SND_CTL_EVENT_MASK_REMOVE) {
printf(" REMOVE\n");
continue;
}
if (mask & SND_CTL_EVENT_MASK_VALUE)
printf(" VALUE");
if (mask & SND_CTL_EVENT_MASK_INFO)
printf(" INFO");
if (mask & SND_CTL_EVENT_MASK_ADD)
printf(" ADD");
if (mask & SND_CTL_EVENT_MASK_TLV)
printf(" TLV");
printf("\n");
}
snd_ctl_close(ctl);
*ctlp = ctl;
return 0;
}
static int print_event(int card, snd_ctl_t *ctl)
{
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;
if (snd_ctl_event_get_type(event) != SND_CTL_EVENT_ELEM)
return 0;
if (card >= 0)
printf("card %d, ", card);
printf("#%d (%i,%i,%i,%s,%i)",
snd_ctl_event_elem_get_numid(event),
snd_ctl_event_elem_get_interface(event),
snd_ctl_event_elem_get_device(event),
snd_ctl_event_elem_get_subdevice(event),
snd_ctl_event_elem_get_name(event),
snd_ctl_event_elem_get_index(event));
mask = snd_ctl_event_elem_get_mask(event);
if (mask == SND_CTL_EVENT_MASK_REMOVE) {
printf(" REMOVE\n");
return 0;
}
if (mask & SND_CTL_EVENT_MASK_VALUE)
printf(" VALUE");
if (mask & SND_CTL_EVENT_MASK_INFO)
printf(" INFO");
if (mask & SND_CTL_EVENT_MASK_ADD)
printf(" ADD");
if (mask & SND_CTL_EVENT_MASK_TLV)
printf(" TLV");
printf("\n");
return 0;
}
#define MAX_CARDS 256
int monitor(const char *name)
{
snd_ctl_t *ctls[MAX_CARDS];
int ncards = 0;
int show_cards;
int i, err;
if (!name) {
int card = -1;
while (snd_card_next(&card) >= 0 && card >= 0) {
char cardname[16];
if (ncards >= MAX_CARDS) {
fprintf(stderr, "alsactl: too many cards\n");
err = -E2BIG;
goto error;
}
sprintf(cardname, "hw:%d", card);
err = open_ctl(cardname, &ctls[ncards]);
if (err < 0)
goto error;
ncards++;
}
show_cards = 1;
} else {
err = open_ctl(name, &ctls[0]);
if (err < 0)
goto error;
ncards++;
show_cards = 0;
}
for (;;) {
struct pollfd fds[ncards];
for (i = 0; i < ncards; i++)
snd_ctl_poll_descriptors(ctls[i], &fds[i], 1);
err = poll(fds, ncards, -1);
if (err <= 0) {
err = 0;
break;
}
for (i = 0; i < ncards; i++) {
unsigned short revents;
snd_ctl_poll_descriptors_revents(ctls[i], &fds[i], 1,
&revents);
if (revents & POLLIN)
print_event(show_cards ? i : -1, ctls[i]);
}
}
error:
for (i = 0; i < ncards; i++)
snd_ctl_close(ctls[i]);
return err;
}