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 with 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.
Note:
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.
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