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mixer: add mixer_ctl_update() API

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Some sound cards update their controls due to external
events, such as HDMI EDID byte data changing when an
HDMI cable is connected. This API allows the count of
elements to be updated.
This commit is contained in:
Simon Wilson
2013-06-28 16:17:50 -07:00
parent 38f87f3be4
commit 710df882fa
2 changed files with 11 additions and 0 deletions
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include/tinyalsa/asoundlib.h
+6
View File
@@ -215,6 +215,12 @@ unsigned int mixer_ctl_get_num_enums(struct mixer_ctl *ctl);
const char *mixer_ctl_get_enum_string(struct mixer_ctl *ctl,
unsigned int enum_id);
/* Some sound cards update their controls due to external events,
* such as HDMI EDID byte data changing when an HDMI cable is
* connected. This API allows the count of elements to be updated.
*/
void mixer_ctl_update(struct mixer_ctl *ctl);
/* Set and get mixer controls */
int mixer_ctl_get_percent(struct mixer_ctl *ctl, unsigned int id);
int mixer_ctl_set_percent(struct mixer_ctl *ctl, unsigned int id, int percent);
mixer.c
+5
View File
@@ -195,6 +195,11 @@ struct mixer_ctl *mixer_get_ctl_by_name(struct mixer *mixer, const char *name)
return NULL;
}
void mixer_ctl_update(struct mixer_ctl *ctl)
{
ioctl(ctl->mixer->fd, SNDRV_CTL_IOCTL_ELEM_INFO, ctl->info);
}
const char *mixer_ctl_get_name(struct mixer_ctl *ctl)
{
if (!ctl)