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Create a new mixer switch
#include <audio_driver.h>
ado_dswitch_t *ado_mixer_switch_new
( ado_mixer_t *mixer,
char *name,
uint32_t type,
uint32_t subtype,
int32_t (*read) ( MIXER_CONTEXT_T *context,
ado_dswitch_t *dswitch,
snd_switch_t *cswitch,
void *instance_data ),
int32_t (*write) ( MIXER_CONTEXT_T *context,
ado_dswitch_t *dswitch,
snd_switch_t *cswitch,
void *instance_data ),
void *instance_data,
void (*instance_free) (void *data) );
- mixer
- A pointer to the ado_mixer_t structure that specifies the
mixer to create the element in.
This structure was created by
ado_mixer_create().
- name
- The name of the element.
Elements are referred to by name, so be careful; for some standard names, see
<asound.h>.
- type
- The type of switch; one of:
- SND_SW_TYPE_BOOLEAN
- SND_SW_TYPE_BYTE
- SND_SW_TYPE_WORD
- SND_SW_TYPE_DWORD
- SND_SW_TYPE_LIST
- subtype
- The subtype of the switch; one of:
- SND_SW_SUBTYPE_DEC
- SND_SW_SUBTYPE_HEXA
- read()
- A callback that reads the state of the switch.
- write()
- A callback that writes the state of the switch.
- instance_data
- A pointer to any instance data that the read and
write() callbacks might need.
This can be a pointer to allocated memory, in which case you'll need to
define the instance_free function.
- instance_free
- A function that must free any allocated instance data.
It's called when the element is destroyed.
The ado_mixer_switch_new() function creates a new mixer switch.
|
A mixer switch isn't the same thing as a mixer switch element:
- Mixer switch element
- Used for things such as mutes and capture selects.
- Mixer switch
- Used less frequently, but still important to have available, e.g.
PCM Loopback.
|
A pointer to the newly allocated switch.
QNX Neutrino
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
No |
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