PipeWire 1.2.6
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Plugin Handle

SPA plugin handle and factory interfaces More...

Files

file  plugin.h
 spa/support/plugin.h
 

Data Structures

struct  spa_handle
 
struct  spa_interface_info
 This structure lists the information about available interfaces on handles. More...
 
struct  spa_support
 Extra supporting infrastructure passed to the init() function of a factory. More...
 
struct  spa_handle_factory
 

Typedefs

typedef int(* spa_handle_factory_enum_func_t) (const struct spa_handle_factory **factory, uint32_t *index)
 The function signature of the entry point in a plugin.
 

Macros

#define SPA_VERSION_HANDLE   0
 Version of this struct.
 
#define spa_handle_get_interface(h, ...)   (h)->get_interface((h),__VA_ARGS__)
 
#define spa_handle_clear(h)   (h)->clear((h))
 
#define SPA_SUPPORT_INIT(type, data)   ((struct spa_support) { (type), (data) })
 
#define SPA_VERSION_HANDLE_FACTORY   1
 The version of this structure.
 
#define spa_handle_factory_get_size(h, ...)   (h)->get_size((h),__VA_ARGS__)
 
#define spa_handle_factory_init(h, ...)   (h)->init((h),__VA_ARGS__)
 
#define spa_handle_factory_enum_interface_info(h, ...)   (h)->enum_interface_info((h),__VA_ARGS__)
 
#define SPA_HANDLE_FACTORY_ENUM_FUNC_NAME   "spa_handle_factory_enum"
 
#define SPA_KEY_FACTORY_NAME   "factory.name"
 the name of a factory
 
#define SPA_KEY_FACTORY_AUTHOR   "factory.author"
 a comma separated list of factory authors
 
#define SPA_KEY_FACTORY_DESCRIPTION   "factory.description"
 description of a factory
 
#define SPA_KEY_FACTORY_USAGE   "factory.usage"
 usage of a factory
 
#define SPA_KEY_LIBRARY_NAME   "library.name"
 the name of a library.
 

Functions

static void * spa_support_find (const struct spa_support *support, uint32_t n_support, const char *type)
 Find a support item of the given type.
 
int spa_handle_factory_enum (const struct spa_handle_factory **factory, uint32_t *index)
 The entry point in a plugin.
 

Detailed Description

SPA plugin handle and factory interfaces

See: SPA Plugins

Typedef Documentation

◆ spa_handle_factory_enum_func_t

typedef int(* spa_handle_factory_enum_func_t) (const struct spa_handle_factory **factory, uint32_t *index)

The function signature of the entry point in a plugin.

Parameters
factorya location to hold the factory result
indexindex to keep track of the enumeration
Returns
1 on success 0 when there are no more factories -EINVAL when factory is NULL
Examples
local-v4l2.c, spa/examples/adapter-control.c, spa/examples/example-control.c, spa/examples/local-libcamera.c, and spa/examples/local-v4l2.c.

Macro Definition Documentation

◆ SPA_VERSION_HANDLE

#define SPA_VERSION_HANDLE   0

Version of this struct.

◆ spa_handle_get_interface

#define spa_handle_get_interface ( h,
... )   (h)->get_interface((h),__VA_ARGS__)

◆ spa_handle_clear

#define spa_handle_clear ( h)    (h)->clear((h))

◆ SPA_SUPPORT_INIT

#define SPA_SUPPORT_INIT ( type,
data )   ((struct spa_support) { (type), (data) })

◆ SPA_VERSION_HANDLE_FACTORY

#define SPA_VERSION_HANDLE_FACTORY   1

The version of this structure.

◆ spa_handle_factory_get_size

#define spa_handle_factory_get_size ( h,
... )   (h)->get_size((h),__VA_ARGS__)

◆ spa_handle_factory_init

#define spa_handle_factory_init ( h,
... )   (h)->init((h),__VA_ARGS__)

◆ spa_handle_factory_enum_interface_info

#define spa_handle_factory_enum_interface_info ( h,
... )   (h)->enum_interface_info((h),__VA_ARGS__)

◆ SPA_HANDLE_FACTORY_ENUM_FUNC_NAME

#define SPA_HANDLE_FACTORY_ENUM_FUNC_NAME   "spa_handle_factory_enum"

◆ SPA_KEY_FACTORY_NAME

#define SPA_KEY_FACTORY_NAME   "factory.name"

the name of a factory

Examples
export-spa-device.c, export-spa.c, and internal.c.

◆ SPA_KEY_FACTORY_AUTHOR

#define SPA_KEY_FACTORY_AUTHOR   "factory.author"

a comma separated list of factory authors

◆ SPA_KEY_FACTORY_DESCRIPTION

#define SPA_KEY_FACTORY_DESCRIPTION   "factory.description"

description of a factory

◆ SPA_KEY_FACTORY_USAGE

#define SPA_KEY_FACTORY_USAGE   "factory.usage"

usage of a factory

◆ SPA_KEY_LIBRARY_NAME

#define SPA_KEY_LIBRARY_NAME   "library.name"

the name of a library.

This is usually the filename of the plugin without the path or the plugin extension.

Examples
export-spa-device.c, export-spa.c, and internal.c.

Function Documentation

◆ spa_support_find()

static void * spa_support_find ( const struct spa_support * support,
uint32_t n_support,
const char * type )
inlinestatic

Find a support item of the given type.

◆ spa_handle_factory_enum()

int spa_handle_factory_enum ( const struct spa_handle_factory ** factory,
uint32_t * index )

The entry point in a plugin.

Parameters
factorya location to hold the factory result
indexindex to keep track of the enumeration
Returns
1 on success 0 when no more items are available < 0 errno type error