PipeWire: spa/support/plugin.h Source File

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plugin.h
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1/* Simple Plugin API */
2/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
3/* SPDX-License-Identifier: MIT */
4
5#ifndef SPA_PLUGIN_H
6#define SPA_PLUGIN_H
7
8#include <errno.h>
9
10#include <spa/utils/defs.h>
11#include <spa/utils/hook.h>
12#include <spa/utils/dict.h>
13
14#ifdef __cplusplus
15extern "C" {
16#endif
17
18#ifndef SPA_API_PLUGIN
19 #ifdef SPA_API_IMPL
20 #define SPA_API_PLUGIN SPA_API_IMPL
21 #else
22 #define SPA_API_PLUGIN static inline
23 #endif
24#endif
25
30
35
36struct spa_handle {
38#define SPA_VERSION_HANDLE 0
39 uint32_t version;
40
43 *
44 * \a interface is always a struct spa_interface but depending on
45 * \a type, the struct might contain other information.
46 *
47 * \param handle a spa_handle
48 * \param type the interface type
49 * \param iface result to hold the interface.
50 * \return 0 on success
51 * -ENOTSUP when there are no interfaces
52 * -EINVAL when handle or info is NULL
53 */
54 int (*get_interface) (struct spa_handle *handle, const char *type, void **iface);
62 int (*clear) (struct spa_handle *handle);
63};
64
65 SPA_API_PLUGIN int
66 spa_handle_get_interface(struct spa_handle *object,
67 const char *type, void **iface)
68{
69 return spa_api_func_r(int, -ENOTSUP, object, get_interface, 0, type, iface);
70}
71 SPA_API_PLUGIN int
72 spa_handle_clear(struct spa_handle *object)
73{
74 return spa_api_func_r(int, -ENOTSUP, object, clear, 0);
75}
76
79
80 */
81struct spa_interface_info {
82 const char *type; /*< the type of the interface, can be
83 * used to get the interface */
84};
85
89 */
90 struct spa_support {
91 const char *type; /*< the type of the support item */
92 void *data; /*< specific data for the item */
93};
94
96 SPA_API_PLUGIN void *spa_support_find(const struct spa_support *support,
97 uint32_t n_support,
98 const char *type)
99{
100 uint32_t i;
101 for (i = 0; i < n_support; i++) {
102 if (strcmp(support[i].type, type) == 0)
103 return support[i].data;
104 }
105 return NULL;
106}
107
108#define SPA_SUPPORT_INIT(type,data) ((struct spa_support) { (type), (data) })
109
110struct spa_handle_factory {
112#define SPA_VERSION_HANDLE_FACTORY 1
113 uint32_t version;
115
119 * See utils/names.h for the list of standard names.
120 *
121 * Examples include:
122 *
123 * api.alsa.pcm.sink: an object to write PCM samples to an alsa PLAYBACK
124 * device
125 * api.v4l2.source: an object to read from a v4l2 source.
126 */
127 const char *name;
131 const struct spa_dict *info;
139 size_t (*get_size) (const struct spa_handle_factory *factory,
140 const struct spa_dict *params);
141
158 int (*init) (const struct spa_handle_factory *factory,
159 struct spa_handle *handle,
160 const struct spa_dict *info,
161 const struct spa_support *support,
162 uint32_t n_support);
163
176 int (*enum_interface_info) (const struct spa_handle_factory *factory,
177 const struct spa_interface_info **info,
178 uint32_t *index);
179};
180
181 SPA_API_PLUGIN size_t
182 spa_handle_factory_get_size(const struct spa_handle_factory *object,
183 const struct spa_dict *params)
184{
185 return spa_api_func_r(size_t, 0, object, get_size, 1, params);
186}
187 SPA_API_PLUGIN int
188 spa_handle_factory_init(const struct spa_handle_factory *object,
189 struct spa_handle *handle, const struct spa_dict *info,
190 const struct spa_support *support, uint32_t n_support)
191{
192 return spa_api_func_r(int, -ENOTSUP, object, init, 1, handle, info,
193 support, n_support);
194}
195 SPA_API_PLUGIN int
196 spa_handle_factory_enum_interface_info(const struct spa_handle_factory *object,
197 const struct spa_interface_info **info, uint32_t *index)
198{
199 return spa_api_func_r(int, -ENOTSUP, object, enum_interface_info, 1,
200 info, index);
201}
202
205
206 * \param factory a location to hold the factory result
207 * \param index index to keep track of the enumeration
208 * \return 1 on success
209 * 0 when there are no more factories
210 * -EINVAL when factory is NULL
211 */
212typedef int (*spa_handle_factory_enum_func_t) (const struct spa_handle_factory **factory,
213 uint32_t *index);
214
215#define SPA_HANDLE_FACTORY_ENUM_FUNC_NAME "spa_handle_factory_enum"
216
226 int spa_handle_factory_enum(const struct spa_handle_factory **factory, uint32_t *index);
227
228
229
230#define SPA_KEY_FACTORY_NAME "factory.name"
231#define SPA_KEY_FACTORY_AUTHOR "factory.author"
232#define SPA_KEY_FACTORY_DESCRIPTION "factory.description"
233#define SPA_KEY_FACTORY_USAGE "factory.usage"
234
235#define SPA_KEY_LIBRARY_NAME "library.name"
238
242
243#ifdef __cplusplus
244} /* extern "C" */
245#endif
246
247#endif /* SPA_PLUGIN_H */
defs.h
spa/utils/defs.h
spa_handle_factory_enum_func_t
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.
Definition plugin.h:222
spa_handle_factory_get_size
SPA_API_PLUGIN size_t spa_handle_factory_get_size(const struct spa_handle_factory *object, const struct spa_dict *params)
Definition plugin.h:192
spa_handle_get_interface
SPA_API_PLUGIN int spa_handle_get_interface(struct spa_handle *object, const char *type, void **iface)
Definition plugin.h:74
spa_support_find
SPA_API_PLUGIN void * spa_support_find(const struct spa_support *support, uint32_t n_support, const char *type)
Find a support item of the given type.
Definition plugin.h:104
spa_handle_factory_enum_interface_info
SPA_API_PLUGIN int spa_handle_factory_enum_interface_info(const struct spa_handle_factory *object, const struct spa_interface_info **info, uint32_t *index)
Definition plugin.h:206
spa_handle_clear
SPA_API_PLUGIN int spa_handle_clear(struct spa_handle *object)
Definition plugin.h:80
spa_handle_factory_init
SPA_API_PLUGIN int spa_handle_factory_init(const struct spa_handle_factory *object, struct spa_handle *handle, const struct spa_dict *info, const struct spa_support *support, uint32_t n_support)
Definition plugin.h:198
spa_handle_factory_enum
int spa_handle_factory_enum(const struct spa_handle_factory **factory, uint32_t *index)
The entry point in a plugin.
spa_api_func_r
#define spa_api_func_r(rtype, def, o, method, version,...)
Definition hook.h:273
hook.h
spa/utils/hook.h
SPA_API_PLUGIN
#define SPA_API_PLUGIN
Definition plugin.h:29
spa_dict
Definition dict.h:51
spa_handle_factory
Definition plugin.h:119
spa_handle_factory::enum_interface_info
int(* enum_interface_info)(const struct spa_handle_factory *factory, const struct spa_interface_info **info, uint32_t *index)
spa_handle_factory::enum_interface_info:
Definition plugin.h:186
spa_handle_factory::version
uint32_t version
Definition plugin.h:123
spa_handle_factory::info
const struct spa_dict * info
Extra information about the handles of this factory.
Definition plugin.h:141
spa_handle_factory::get_size
size_t(* get_size)(const struct spa_handle_factory *factory, const struct spa_dict *params)
Get the size of handles from this factory.
Definition plugin.h:149
spa_handle_factory::init
int(* init)(const struct spa_handle_factory *factory, struct spa_handle *handle, const struct spa_dict *info, const struct spa_support *support, uint32_t n_support)
Initialize an instance of this factory.
Definition plugin.h:168
spa_handle
Definition plugin.h:43
spa_handle::get_interface
int(* get_interface)(struct spa_handle *handle, const char *type, void **iface)
Get the interface provided by handle with type.
Definition plugin.h:62
spa_handle::clear
int(* clear)(struct spa_handle *handle)
Clean up the memory of handle.
Definition plugin.h:70
spa_handle::version
uint32_t version
Definition plugin.h:47
spa_interface_info
This structure lists the information about available interfaces on handles.
Definition plugin.h:89
spa_interface_info::type
const char * type
Definition plugin.h:90
spa_support
Extra supporting infrastructure passed to the init() function of a factory.
Definition plugin.h:98
spa_support::type
const char * type
Definition plugin.h:99
dict.h
spa/utils/dict.h