#include <control_external.h>

Data Fields
void(*)	close (snd_ctl_ext_t *ext)
int(*)	elem_count (snd_ctl_ext_t *ext)
int(*)	elem_list (snd_ctl_ext_t ext, unsigned int offset, snd_ctl_elem_id_t id)
snd_ctl_ext_key_t(*)	find_elem (snd_ctl_ext_t ext, const snd_ctl_elem_id_t id)
void(*)	free_key (snd_ctl_ext_t *ext, snd_ctl_ext_key_t key)
int(*)	get_attribute (snd_ctl_ext_t ext, snd_ctl_ext_key_t key, int type, unsigned int acc, unsigned int count)
int(*)	get_integer_info (snd_ctl_ext_t ext, snd_ctl_ext_key_t key, long imin, long imax, long istep)
int(*)	get_integer64_info (snd_ctl_ext_t ext, snd_ctl_ext_key_t key, int64_t imin, int64_t imax, int64_t istep)
int(*)	get_enumerated_info (snd_ctl_ext_t ext, snd_ctl_ext_key_t key, unsigned int items)
int(*)	get_enumerated_name (snd_ctl_ext_t ext, snd_ctl_ext_key_t key, unsigned int item, char name, size_t name_max_len)
int(*)	read_integer (snd_ctl_ext_t ext, snd_ctl_ext_key_t key, long value)
int(*)	read_integer64 (snd_ctl_ext_t ext, snd_ctl_ext_key_t key, int64_t value)
int(*)	read_enumerated (snd_ctl_ext_t ext, snd_ctl_ext_key_t key, unsigned int items)
int(*)	read_bytes (snd_ctl_ext_t ext, snd_ctl_ext_key_t key, unsigned char data, size_t max_bytes)
int(*)	read_iec958 (snd_ctl_ext_t ext, snd_ctl_ext_key_t key, snd_aes_iec958_t iec958)
int(*)	write_integer (snd_ctl_ext_t ext, snd_ctl_ext_key_t key, long value)
int(*)	write_integer64 (snd_ctl_ext_t ext, snd_ctl_ext_key_t key, int64_t value)
int(*)	write_enumerated (snd_ctl_ext_t ext, snd_ctl_ext_key_t key, unsigned int items)
int(*)	write_bytes (snd_ctl_ext_t ext, snd_ctl_ext_key_t key, unsigned char data, size_t max_bytes)
int(*)	write_iec958 (snd_ctl_ext_t ext, snd_ctl_ext_key_t key, snd_aes_iec958_t iec958)
void(*)	subscribe_events (snd_ctl_ext_t *ext, int subscribe)
int(*)	read_event (snd_ctl_ext_t ext, snd_ctl_elem_id_t id, unsigned int *event_mask)
int(*)	poll_descriptors_count (snd_ctl_ext_t *ext)
int(*)	poll_descriptors (snd_ctl_ext_t ext, struct pollfd pfds, unsigned int space)
int(*)	poll_revents (snd_ctl_ext_t ext, struct pollfd pfds, unsigned int nfds, unsigned short *revents)

Detailed Description

Callback table of ext.

Callback table of control ext

Field Documentation

◆ close

void(*) snd_ctl_ext_callback_t::close(snd_ctl_ext_t *ext)

close the control handle; optional

◆ elem_count

int(*) snd_ctl_ext_callback_t::elem_count(snd_ctl_ext_t *ext)

return the total number of elements; required

◆ elem_list

int(*) snd_ctl_ext_callback_t::elem_list(snd_ctl_ext_t *ext, unsigned int offset, snd_ctl_elem_id_t *id)

return the element id of the given offset (array index); required

◆ find_elem

snd_ctl_ext_key_t(*) snd_ctl_ext_callback_t::find_elem(snd_ctl_ext_t *ext, const snd_ctl_elem_id_t *id)

convert the element id to a search key; required

◆ free_key

void(*) snd_ctl_ext_callback_t::free_key(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key)

the destructor of the key; optional

◆ get_attribute

int(*) snd_ctl_ext_callback_t::get_attribute(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, int *type, unsigned int *acc, unsigned int *count)

get the attribute of the element; required

◆ get_enumerated_info

int(*) snd_ctl_ext_callback_t::get_enumerated_info(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int *items)

get the element information of enumerated type

◆ get_enumerated_name

int(*) snd_ctl_ext_callback_t::get_enumerated_name(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int item, char *name, size_t name_max_len)

get the name of the enumerated item

◆ get_integer64_info

int(*) snd_ctl_ext_callback_t::get_integer64_info(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, int64_t *imin, int64_t *imax, int64_t *istep)

get the element information of integer64 type

◆ get_integer_info

int(*) snd_ctl_ext_callback_t::get_integer_info(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, long *imin, long *imax, long *istep)

get the element information of integer type

◆ poll_descriptors

int(*) snd_ctl_ext_callback_t::poll_descriptors(snd_ctl_ext_t *ext, struct pollfd *pfds, unsigned int space)

fill the poll descriptors; optional

◆ poll_descriptors_count

int(*) snd_ctl_ext_callback_t::poll_descriptors_count(snd_ctl_ext_t *ext)

return the number of poll descriptors; optional

◆ poll_revents

int(*) snd_ctl_ext_callback_t::poll_revents(snd_ctl_ext_t *ext, struct pollfd *pfds, unsigned int nfds, unsigned short *revents)

mangle the revents of poll descriptors

◆ read_bytes

int(*) snd_ctl_ext_callback_t::read_bytes(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned char *data, size_t max_bytes)

read the current values of bytes type

◆ read_enumerated

int(*) snd_ctl_ext_callback_t::read_enumerated(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int *items)

read the current values of enumerated type

◆ read_event

int(*) snd_ctl_ext_callback_t::read_event(snd_ctl_ext_t *ext, snd_ctl_elem_id_t *id, unsigned int *event_mask)

read a pending notification event; optional

◆ read_iec958

int(*) snd_ctl_ext_callback_t::read_iec958(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, snd_aes_iec958_t *iec958)

read the current values of iec958 type

◆ read_integer

int(*) snd_ctl_ext_callback_t::read_integer(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, long *value)

read the current values of integer type

◆ read_integer64

int(*) snd_ctl_ext_callback_t::read_integer64(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, int64_t *value)

read the current values of integer64 type

◆ subscribe_events

void(*) snd_ctl_ext_callback_t::subscribe_events(snd_ctl_ext_t *ext, int subscribe)

subscribe/unsubscribe the event notification; optional

◆ write_bytes

int(*) snd_ctl_ext_callback_t::write_bytes(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned char *data, size_t max_bytes)

update the current values of bytes type with the given values

◆ write_enumerated

int(*) snd_ctl_ext_callback_t::write_enumerated(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int *items)

update the current values of enumerated type with the given values

◆ write_iec958

int(*) snd_ctl_ext_callback_t::write_iec958(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, snd_aes_iec958_t *iec958)

update the current values of iec958 type with the given values

◆ write_integer

int(*) snd_ctl_ext_callback_t::write_integer(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, long *value)

update the current values of integer type with the given values

◆ write_integer64

int(*) snd_ctl_ext_callback_t::write_integer64(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, int64_t *value)

update the current values of integer64 type with the given values

The documentation for this struct was generated from the following file:

/home/lkp/rpmbuild/BUILD/alsa-lib-1.2.16.1/include/control_external.h

Data Fields