Create a volume (type 1) element
#include <audio_driver.h> ado_mixer_delement_t *ado_mixer_element_volume1 ( ado_mixer_t *mixer, char *name, uint32_t number_of_voices, struct snd_mixer_element_volume1_range *ranges, ado_mixer_delement_control_volume1_t *control, void *instance_data, void (*instance_free) (void *data) );
typedef struct snd_mixer_element_volume1_range { int32_t min, max; int32_t min_dB, max_dB; uint8_t reserved[128]; /* must be filled with zero */ } snd_mixer_element_volume1_range_t;
The prototype is:
int32_t control( MIXER_CONTEXT_T *context, ado_mixer_delement_t *element, uint8_t set, uint32_t *volumes, void *instance_data );
If you need to access this instance data, you have to call ado_mixer_get_element_instance_data() because ado_mixer_delement_t is an opaque data type.
The ado_mixer_element_volume1() convenience function automates the creation of a volume (type 1) element.
A pointer to the newly allocated volume (type 1) element.
QNX Neutrino
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | No |
ado_mixer_element_vol_range_max(), ado_mixer_element_vol_range_min(), ado_mixer_get_element_instance_data()