snd_mixer_element_read()
Get a mixer element's configurable parameters
Synopsis:
#include <sys/asoundlib.h>
int snd_mixer_element_read(
snd_mixer_t *handle,
snd_mixer_element_t *element );
Arguments:
- handle
- The handle for the mixer device. This must have been created by snd_mixer_open() .
- element
- A pointer to a snd_mixer_element_t in which snd_mixer_element_read() stores the element's configurable parameters.
Library:
libasound.so
Use the -l asound option to qcc to link against this library.
Description:
The snd_mixer_element_read() function fills the snd_mixer_element_t structure with information on the current settings of the element identified by the eid substructure.
We recommend that you work with mixer groups instead of manipulating the
elements directly.
Returns:
Zero on success, or a negative error value on error.
Errors:
- -EINVAL
- Invalid handle or element argument.
- -ENXIO
- The element wasn't found.
Classification:
QNX Neutrino
| Safety: | |
|---|---|
| Cancellation point | No |
| Interrupt handler | No |
| Signal handler | Yes |
| Thread | Yes |
Caveats:
The element struct must be initialized to a known state before making the call: use memset() to set the struct to zero, and then set the eid member to specify which element to read.