size_t
actlstr(char *buf, size_t n, char *ch, struct mixer *mx) {
size_t ret;
char *status;
struct mixer_ctl *ctl;
if (!(ctl = mixer_get_ctl_by_name(mx, ch))) {
mixer_close(mx);
die("couldn't find mixer ctl '%s'\n", ch);
}
switch (mixer_ctl_get_type(ctl)) {
case MIXER_CTL_TYPE_INT:
if ((ret = snprintf(buf, n, "%d%%",
mixer_ctl_get_percent(ctl, 0))) > n)
ret = n;
break;
case MIXER_CTL_TYPE_BOOL:
status = mixer_ctl_get_value(ctl, 0) ? "On" : "Off";
ret = stpncpy(buf, status, n) - buf;
break;
default:
mixer_close(mx);
die("unsupported ctl type '%s'\n",
mixer_ctl_get_type_string(ctl));
};
return ret;
}
int write_percentage(int argc, char **argv) {
int nMixer = -1, nControl = -1;
int location = -1, value = -1;
if (argc == 6) {
nMixer = atoi(argv[2]);
nControl = atoi(argv[3]);
location = atoi(argv[4]);
value = atoi(argv[5]);
}
if (argc != 6 || nMixer < 0 || nMixer > 7 || nControl < 0 || location < 0) {
printf("Usage: ainfo write-percentage <card number> <control number> <location> <value>\n"
"where <card number> is between 0 and 7\n"
"<control number> is the control to be written\n"
"<location> is the location to be written\n"
"<value> is the value to be written\n");
return 0;
}
mixer *m = mixer_open(nMixer);
if (m == NULL) {
printf("Unable to open card #%d\n", nMixer);
return 0;
}
mixer_ctl *c = mixer_get_ctl(m, nControl);
if (c == NULL) {
printf("Unable to open control #%d\n", nControl);
return 0;
}
char name[64], type[64];
mixer_ctl_get_name(c, name, sizeof(name));
mixer_ctl_set_percent(c, location, value);
printf("Control: %s\nPercent: %d\nValue: %d\n", name,
mixer_ctl_get_percent(c, location), mixer_ctl_get_value(c, location));
return 0;
}