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alsactl init - add dB and percentual CTL{value} parsing for integer values

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Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2008-08-14 14:08:22 +02:00
parent 11684b3c8b
commit e02535b1a8
1 changed files with 38 additions and 2 deletions
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40
alsactl/init_parse.c
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@ -36,6 +36,7 @@
#include <sys/select.h> #include <sys/select.h>
#include <sys/types.h> #include <sys/types.h>
#include <dirent.h> #include <dirent.h>
#include <math.h>
#include <alsa/asoundlib.h> #include <alsa/asoundlib.h>
#include "aconfig.h" #include "aconfig.h"
#include "alsactl.h" #include "alsactl.h"
@ -330,13 +331,18 @@ static const char *get_ctl_value(struct space *space)
return res; return res;
} }
/* Function to convert from percentage to volume. val = percentage */
#define convert_prange1(val, min, max) \
ceil((val) * ((max) - (min)) * 0.01 + (min))
static int set_ctl_value(struct space *space, const char *value) static int set_ctl_value(struct space *space, const char *value)
{ {
snd_ctl_elem_type_t type; snd_ctl_elem_type_t type;
unsigned int idx, idx2, count, items; unsigned int idx, idx2, count, items;
const char *pos; const char *pos, *pos2;
snd_hctl_elem_t *elem; snd_hctl_elem_t *elem;
int val; int val;
long lval;
type = snd_ctl_elem_info_get_type(space->ctl_info); type = snd_ctl_elem_info_get_type(space->ctl_info);
count = snd_ctl_elem_info_get_count(space->ctl_info); count = snd_ctl_elem_info_get_count(space->ctl_info);
@ -360,8 +366,38 @@ static int set_ctl_value(struct space *space, const char *value)
for (idx = 0; idx < count; idx++) { for (idx = 0; idx < count; idx++) {
while (*value == ' ') while (*value == ' ')
value++; value++;
snd_ctl_elem_value_set_integer(space->ctl_value, idx, strtol(value, NULL, 0));
pos = strchr(value, ','); pos = strchr(value, ',');
if (pos)
*(char *)pos = '\0';
remove_trailing_chars((char *)value, ' ');
items = pos ? pos - value : strlen(value);
if (items > 1 && value[items-1] == '%') {
val = convert_prange1(strtol(value, NULL, 0), snd_ctl_elem_info_get_min(space->ctl_info), snd_ctl_elem_info_get_max(space->ctl_info));
snd_ctl_elem_value_set_integer(space->ctl_value, idx, val);
} else if (items > 2 && value[items-2] == 'd' && value[items-1] == 'B') {
val = strtol(value, NULL, 0) * 100;
if ((pos2 = index(value, '.')) != NULL) {
if (isdigit(*(pos2-1)) && isdigit(*(pos2-2))) {
if (val < 0)
val -= strtol(pos2 + 1, NULL, 0);
else
val += strtol(pos2 + 1, NULL, 0);
} else if (isdigit(*(pos2-1))) {
if (val < 0)
val -= strtol(pos2 + 1, NULL, 0) * 10;
else
val += strtol(pos2 + 1, NULL, 0) * 10;
}
}
val = snd_ctl_convert_from_dB(snd_hctl_ctl(space->ctl_handle), space->ctl_id, val, &lval, -1);
if (val < 0) {
Perror(space, "unable to convert dB value '%s' to internal integer range", value);
return val;
}
snd_ctl_elem_value_set_integer(space->ctl_value, idx, lval);
} else {
snd_ctl_elem_value_set_integer(space->ctl_value, idx, strtol(value, NULL, 0));
}
value = pos ? pos + 1 : value + strlen(value) - 1; value = pos ? pos + 1 : value + strlen(value) - 1;
} }
break; break;