pw_device_methods Struct Reference

Device methods. More...

#include <pipewire/device.h>

Data Fields
uint32_t	version
int(*	add_listener )(void *object, struct spa_hook *listener, const struct pw_device_events *events, void *data)
int(*	subscribe_params )(void *object, uint32_t *ids, uint32_t n_ids)
	Subscribe to parameter changes.
int(*	enum_params )(void *object, int seq, uint32_t id, uint32_t start, uint32_t num, const struct spa_pod *filter)
	Enumerate device parameters.
int(*	set_param )(void *object, uint32_t id, uint32_t flags, const struct spa_pod *param)
	Set a parameter on the device.

Detailed Description

Device methods.

Field Documentation

version

uint32_t pw_device_methods::version

add_listener

int(* pw_device_methods::add_listener) (void *object, struct spa_hook *listener, const struct pw_device_events *events, void *data)

subscribe_params

int(* pw_device_methods::subscribe_params) (void *object, uint32_t *ids, uint32_t n_ids)

Subscribe to parameter changes.

Automatically emit param events for the given ids when they are changed.

Parameters

ids	an array of param ids
n_ids	the number of ids in ids

This requires X permissions on the device.

enum_params

int(* pw_device_methods::enum_params) (void *object, int seq, uint32_t id, uint32_t start, uint32_t num, const struct spa_pod *filter)

Enumerate device parameters.

Start enumeration of device parameters. For each param, a param event will be emitted.

Parameters

seq	a sequence number to place in the reply
id	the parameter id to enum or PW_ID_ANY for all
start	the start index or 0 for the first param
num	the maximum number of params to retrieve
filter	a param filter or NULL

This requires X permissions on the device.

set_param

int(* pw_device_methods::set_param) (void *object, uint32_t id, uint32_t flags, const struct spa_pod *param)

Set a parameter on the device.

Parameters

id	the parameter id to set
flags	extra parameter flags
param	the parameter to set

This requires W and X permissions on the device.

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

• pipewire/device.h