snd_mixer_group_read()
Get a mixer group's configurable parameters
Synopsis:
#include <sys/asoundlib.h>
int snd_mixer_group_read(
snd_mixer_t *handle,
snd_mixer_group_t *group );
Arguments:
- handle
- The handle for the mixer device. This must have been created by snd_mixer_open().
- group
- A pointer to a snd_mixer_group_t structure that snd_mixer_group_read() fills in with information about the mixer group.
Library:
libasound.so
Use the -l asound option with qcc to link against this library.
Description:
The snd_mixer_group_read() function reads the snd_mixer_group_t structure for the group identified by the gid substructure (for more information, see snd_mixer_gid_t).
Note:
You must initialize the gid substructure before calling this function.
Returns:
Zero on success, or a negative error value on error.
Errors:
- -EINVAL
- Invalid handle argument.
- -ENXIO
- The group wasn't found.
Classification:
QNX Neutrino
| Safety: | |
|---|---|
| Cancellation point | No |
| Interrupt handler | No |
| Signal handler | Yes |
| Thread | Yes |
Caveats:
The group struct must be initialized to a known state before making the call: use memset() to set the struct to zero, and then set the gid member to specify which group to read.
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