Link

A link is the connection between 2 nodes (Node). More...

Files
file	link.h
	pipewire/link.h

Data Structures
struct	pw_link_info
	The link information. More...
struct	pw_link_events
	Link events. More...
struct	pw_link_methods
	Link methods. More...
struct	pw_link

Macros
#define	PW_TYPE_INTERFACE_Link   PW_TYPE_INFO_INTERFACE_BASE "Link"
#define	PW_VERSION_LINK   3
#define	PW_LINK_CHANGE_MASK_STATE   (1 << 0)
#define	PW_LINK_CHANGE_MASK_FORMAT   (1 << 1)
#define	PW_LINK_CHANGE_MASK_PROPS   (1 << 2)
#define	PW_LINK_CHANGE_MASK_ALL   ((1 << 3)-1)
#define	PW_LINK_EVENT_INFO   0
#define	PW_LINK_EVENT_NUM   1
#define	PW_VERSION_LINK_EVENTS   0
#define	PW_LINK_METHOD_ADD_LISTENER   0
#define	PW_LINK_METHOD_NUM   1
#define	PW_VERSION_LINK_METHODS   0
#define	pw_link_method(o, method, version, ...)
#define	pw_link_add_listener(c, ...)   pw_link_method(c,add_listener,0,__VA_ARGS__)

Enumerations
enum	pw_link_state {   PW_LINK_STATE_ERROR = -2 , PW_LINK_STATE_UNLINKED = -1 , PW_LINK_STATE_INIT = 0 , PW_LINK_STATE_NEGOTIATING = 1 ,   PW_LINK_STATE_ALLOCATING = 2 , PW_LINK_STATE_PAUSED = 3 , PW_LINK_STATE_ACTIVE = 4 }
	The different link states. More...

Functions
const char *	pw_link_state_as_string (enum pw_link_state state)
	Convert a pw_link_state to a readable string. More...
struct pw_link_info *	pw_link_info_update (struct pw_link_info *info, const struct pw_link_info *update)
struct pw_link_info *	pw_link_info_merge (struct pw_link_info *info, const struct pw_link_info *update, bool reset)
void	pw_link_info_free (struct pw_link_info *info)

Detailed Description

A link is the connection between 2 nodes (Node).

Nodes are linked together on ports.

The link is responsible for negotiating the format and buffers for the nodes.

Macro Definition Documentation

PW_TYPE_INTERFACE_Link

#define PW_TYPE_INTERFACE_Link   PW_TYPE_INFO_INTERFACE_BASE "Link"

Examples

local-v4l2.c.

PW_VERSION_LINK

#define PW_VERSION_LINK   3

Examples

local-v4l2.c.

PW_LINK_CHANGE_MASK_STATE

#define PW_LINK_CHANGE_MASK_STATE   (1 << 0)

PW_LINK_CHANGE_MASK_FORMAT

#define PW_LINK_CHANGE_MASK_FORMAT   (1 << 1)

PW_LINK_CHANGE_MASK_PROPS

#define PW_LINK_CHANGE_MASK_PROPS   (1 << 2)

PW_LINK_CHANGE_MASK_ALL

#define PW_LINK_CHANGE_MASK_ALL   ((1 << 3)-1)

PW_LINK_EVENT_INFO

#define PW_LINK_EVENT_INFO   0

PW_LINK_EVENT_NUM

#define PW_LINK_EVENT_NUM   1

PW_VERSION_LINK_EVENTS

#define PW_VERSION_LINK_EVENTS   0

PW_LINK_METHOD_ADD_LISTENER

#define PW_LINK_METHOD_ADD_LISTENER   0

PW_LINK_METHOD_NUM

#define PW_LINK_METHOD_NUM   1

PW_VERSION_LINK_METHODS

#define PW_VERSION_LINK_METHODS   0

pw_link_method

#define pw_link_method	(		o,
			method,
			version,
			...
	)

pw_link_add_listener

#define pw_link_add_listener	(		c,
			...
	)		pw_link_method(c,add_listener,0,__VA_ARGS__)

See also

pw_link_methods.add_listener

Enumeration Type Documentation

pw_link_state

enum pw_link_state

The different link states.

Enumerator
PW_LINK_STATE_ERROR	the link is in error
PW_LINK_STATE_UNLINKED	the link is unlinked
PW_LINK_STATE_INIT	the link is initialized
PW_LINK_STATE_NEGOTIATING	the link is negotiating formats
PW_LINK_STATE_ALLOCATING	the link is allocating buffers
PW_LINK_STATE_PAUSED	the link is paused
PW_LINK_STATE_ACTIVE	the link is active

Function Documentation

pw_link_state_as_string()

const char * pw_link_state_as_string

(

enum pw_link_state

state

)

Convert a pw_link_state to a readable string.

pw_link_info_update()

struct pw_link_info * pw_link_info_update	(	struct pw_link_info *	info,
		const struct pw_link_info *	update
	)

pw_link_info_merge()

struct pw_link_info * pw_link_info_merge	(	struct pw_link_info *	info,
		const struct pw_link_info *	update,
		bool	reset
	)

pw_link_info_free()

void pw_link_info_free

(

struct pw_link_info *

info

)