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hook.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_HOOK_H
6#define SPA_HOOK_H
7
8#ifdef __cplusplus
9 extern "C" {
10#endif
11
12#include <spa/utils/defs.h>
13#include <spa/utils/list.h>
14
15#ifndef SPA_API_HOOK
16 #ifdef SPA_API_IMPL
17 #define SPA_API_HOOK SPA_API_IMPL
18 #else
19 #define SPA_API_HOOK static inline
20 #endif
21#endif
22
108
113
118 struct spa_callbacks {
119 const void *funcs;
120 void *data;
121};
122
124#define SPA_CALLBACK_VERSION_MIN(c,v) ((c) && ((v) == 0 || (c)->version > (v)-1))
125
126/** Check if a callback \a c has method \a m of version \a v */
127#define SPA_CALLBACK_CHECK(c,m,v) (SPA_CALLBACK_VERSION_MIN(c,v) && (c)->m)
128
130
133#define SPA_CALLBACKS_INIT(_funcs,_data) ((struct spa_callbacks){ (_funcs), (_data), })
134
137 struct spa_interface {
138 const char *type;
139 uint32_t version;
140 struct spa_callbacks cb;
141};
142
148 * .bar = some_bar_implementation,
149 * };
150 *
151 * struct foo *f = malloc(...);
152 * f->iface = SPA_INTERFACE_INIT("foo type", 0, foo_funcs, NULL);
153 * \endcode
154 *
155 */
156#define SPA_INTERFACE_INIT(_type,_version,_funcs,_data) \
157 ((struct spa_interface){ (_type), (_version), SPA_CALLBACKS_INIT(_funcs,_data), })
158
164#define spa_callbacks_call(callbacks,type,method,vers,...) \
165({ \
166 const type *_f = (const type *) (callbacks)->funcs; \
167 bool _res = SPA_CALLBACK_CHECK(_f,method,vers); \
168 if (SPA_LIKELY(_res)) \
169 (_f->method)((callbacks)->data, ## __VA_ARGS__); \
170 _res; \
171})
172
173#define spa_callbacks_call_fast(callbacks,type,method,vers,...) \
174({ \
175 const type *_f = (const type *) (callbacks)->funcs; \
176 (_f->method)((callbacks)->data, ## __VA_ARGS__); \
177 true; \
178})
179
180
183
184#define spa_callback_version_min(callbacks,type,vers) \
185({ \
186 const type *_f = (const type *) (callbacks)->funcs; \
187 SPA_CALLBACK_VERSION_MIN(_f,vers); \
188})
189
190
194#define spa_callback_check(callbacks,type,method,vers) \
195({ \
196 const type *_f = (const type *) (callbacks)->funcs; \
197 SPA_CALLBACK_CHECK(_f,method,vers); \
198})
199
200
205 */
206#define spa_callbacks_call_res(callbacks,type,res,method,vers,...) \
207({ \
208 const type *_f = (const type *) (callbacks)->funcs; \
209 if (SPA_LIKELY(SPA_CALLBACK_CHECK(_f,method,vers))) \
210 res = (_f->method)((callbacks)->data, ## __VA_ARGS__); \
211 res; \
212})
213#define spa_callbacks_call_fast_res(callbacks,type,res,method,vers,...) \
214({ \
215 const type *_f = (const type *) (callbacks)->funcs; \
216 res = (_f->method)((callbacks)->data, ## __VA_ARGS__); \
217})
218
222#define spa_interface_callback_version_min(iface,method_type,vers) \
223 spa_callback_version_min(&(iface)->cb, method_type, vers)
224
229#define spa_interface_callback_check(iface,method_type,method,vers) \
230 spa_callback_check(&(iface)->cb, method_type, method, vers)
231
233 * Invoke method named \a method in the callbacks on the given interface object.
234 * The \a method_type defines the type of the method struct, not the interface
235 * itself.
236 */
237#define spa_interface_call(iface,method_type,method,vers,...) \
238 spa_callbacks_call(&(iface)->cb,method_type,method,vers,##__VA_ARGS__)
239
240#define spa_interface_call_fast(iface,method_type,method,vers,...) \
241 spa_callbacks_call_fast(&(iface)->cb,method_type,method,vers,##__VA_ARGS__)
242
248 * The return value is stored in \a res.
249 */
250#define spa_interface_call_res(iface,method_type,res,method,vers,...) \
251 spa_callbacks_call_res(&(iface)->cb,method_type,res,method,vers,##__VA_ARGS__)
252
253#define spa_interface_call_fast_res(iface,method_type,res,method,vers,...) \
254 spa_callbacks_call_fast_res(&(iface)->cb,method_type,res,method,vers,##__VA_ARGS__)
255
256
257#define spa_api_func_v(o,method,version,...) \
258({ \
259 if (SPA_LIKELY(SPA_CALLBACK_CHECK(o,method,version))) \
260 ((o)->method)(o, ##__VA_ARGS__); \
261})
262#define spa_api_func_r(rtype,def,o,method,version,...) \
263({ \
264 rtype _res = def; \
265 if (SPA_LIKELY(SPA_CALLBACK_CHECK(o,method,version))) \
266 _res = ((o)->method)(o, ##__VA_ARGS__); \
267 _res; \
268})
269#define spa_api_func_fast(o,method,...) \
270({ \
271 ((o)->method)(o, ##__VA_ARGS__); \
272})
273
274#define spa_api_method_v(type,o,method,version,...) \
275({ \
276 struct spa_interface *_i = o; \
277 spa_interface_call(_i, struct type ##_methods, \
278 method, version, ##__VA_ARGS__); \
279})
280#define spa_api_method_r(rtype,def,type,o,method,version,...) \
281({ \
282 rtype _res = def; \
283 struct spa_interface *_i = o; \
284 spa_interface_call_res(_i, struct type ##_methods, \
285 _res, method, version, ##__VA_ARGS__); \
286 _res; \
287})
288#define spa_api_method_null_v(type,co,o,method,version,...) \
289({ \
290 struct type *_co = co; \
291 if (SPA_LIKELY(_co != NULL)) { \
292 struct spa_interface *_i = o; \
293 spa_interface_call(_i, struct type ##_methods, \
294 method, version, ##__VA_ARGS__); \
295 } \
296})
297#define spa_api_method_null_r(rtype,def,type,co,o,method,version,...) \
298({ \
299 rtype _res = def; \
300 struct type *_co = co; \
301 if (SPA_LIKELY(_co != NULL)) { \
302 struct spa_interface *_i = o; \
303 spa_interface_call_res(_i, struct type ##_methods, \
304 _res, method, version, ##__VA_ARGS__); \
305 } \
306 _res; \
307})
308#define spa_api_method_fast_v(type,o,method,version,...) \
309({ \
310 struct spa_interface *_i = o; \
311 spa_interface_call_fast(_i, struct type ##_methods, \
312 method, version, ##__VA_ARGS__); \
313})
314#define spa_api_method_fast_r(rtype,def,type,o,method,version,...) \
315({ \
316 rtype _res = def; \
317 struct spa_interface *_i = o; \
318 spa_interface_call_fast_res(_i, struct type ##_methods, \
319 _res, method, version, ##__VA_ARGS__); \
320 _res; \
321})
322
325
325 */
326
333
396
401
405 struct spa_hook_list {
406 struct spa_list list;
407};
408
409
416 struct spa_hook {
417 struct spa_list link;
418 struct spa_callbacks cb;
419
421 void (*removed) (struct spa_hook *hook);
422 void *priv;
423};
424
426 SPA_API_HOOK void spa_hook_list_init(struct spa_hook_list *list)
427{
428 spa_list_init(&list->list);
429}
430
431 SPA_API_HOOK bool spa_hook_list_is_empty(struct spa_hook_list *list)
432{
433 return spa_list_is_empty(&list->list);
434}
435
437 SPA_API_HOOK void spa_hook_list_append(struct spa_hook_list *list,
438 struct spa_hook *hook,
439 const void *funcs, void *data)
440{
441 spa_zero(*hook);
442 hook->cb = SPA_CALLBACKS_INIT(funcs, data);
443 spa_list_append(&list->list, &hook->link);
444}
445
446
447 SPA_API_HOOK void spa_hook_list_prepend(struct spa_hook_list *list,
448 struct spa_hook *hook,
449 const void *funcs, void *data)
450{
451 spa_zero(*hook);
452 hook->cb = SPA_CALLBACKS_INIT(funcs, data);
453 spa_list_prepend(&list->list, &hook->link);
454}
455
456
457 SPA_API_HOOK void spa_hook_remove(struct spa_hook *hook)
458{
459 if (spa_list_is_initialized(&hook->link))
460 spa_list_remove(&hook->link);
461 if (hook->removed)
462 hook->removed(hook);
463}
464
466 SPA_API_HOOK void spa_hook_list_clean(struct spa_hook_list *list)
467{
468 struct spa_hook *h;
469 spa_list_consume(h, &list->list, link)
470 spa_hook_remove(h);
471}
472
473 SPA_API_HOOK void
474 spa_hook_list_isolate(struct spa_hook_list *list,
475 struct spa_hook_list *save,
476 struct spa_hook *hook,
477 const void *funcs, void *data)
478{
479 /* init save list and move hooks to it */
480 spa_hook_list_init(save);
481 spa_list_insert_list(&save->list, &list->list);
482 /* init hooks and add single hook */
483 spa_hook_list_init(list);
484 spa_hook_list_append(list, hook, funcs, data);
485}
486
487 SPA_API_HOOK void
488 spa_hook_list_join(struct spa_hook_list *list,
489 struct spa_hook_list *save)
490{
491 spa_list_insert_list(&list->list, &save->list);
492}
493
494#define spa_hook_list_call_simple(l,type,method,vers,...) \
495({ \
496 struct spa_hook_list *_l = l; \
497 struct spa_hook *_h, *_t; \
498 spa_list_for_each_safe(_h, _t, &_l->list, link) \
499 spa_callbacks_call(&_h->cb,type,method,vers, ## __VA_ARGS__); \
500})
501
504
505#define spa_hook_list_do_call(l,start,type,method,vers,once,...) \
506({ \
507 struct spa_hook_list *_list = l; \
508 struct spa_list *_s = start ? (struct spa_list *)start : &_list->list; \
509 struct spa_hook _cursor = { 0 }, *_ci; \
510 int _count = 0; \
511 spa_list_cursor_start(_cursor, _s, link); \
512 spa_list_for_each_cursor(_ci, _cursor, &_list->list, link) { \
513 if (spa_callbacks_call(&_ci->cb,type,method,vers, ## __VA_ARGS__)) { \
514 _count++; \
515 if (once) \
516 break; \
517 } \
518 } \
519 spa_list_cursor_end(_cursor, link); \
520 _count; \
521})
522
527#define spa_hook_list_call(l,t,m,v,...) spa_hook_list_do_call(l,NULL,t,m,v,false,##__VA_ARGS__)
533#define spa_hook_list_call_once(l,t,m,v,...) spa_hook_list_do_call(l,NULL,t,m,v,true,##__VA_ARGS__)
534
535#define spa_hook_list_call_start(l,s,t,m,v,...) spa_hook_list_do_call(l,s,t,m,v,false,##__VA_ARGS__)
536#define spa_hook_list_call_once_start(l,s,t,m,v,...) spa_hook_list_do_call(l,s,t,m,v,true,##__VA_ARGS__)
537
541
542#ifdef __cplusplus
543}
544#endif
545
546#endif /* SPA_HOOK_H */
defs.h
spa/utils/defs.h
spa_hook_list_is_empty
SPA_API_HOOK bool spa_hook_list_is_empty(struct spa_hook_list *list)
Definition hook.h:442
spa_hook_list_clean
SPA_API_HOOK void spa_hook_list_clean(struct spa_hook_list *list)
Remove all hooks from the list.
Definition hook.h:477
spa_hook_list_isolate
SPA_API_HOOK void spa_hook_list_isolate(struct spa_hook_list *list, struct spa_hook_list *save, struct spa_hook *hook, const void *funcs, void *data)
Definition hook.h:485
spa_hook_remove
SPA_API_HOOK void spa_hook_remove(struct spa_hook *hook)
Remove a hook.
Definition hook.h:468
spa_hook_list_join
SPA_API_HOOK void spa_hook_list_join(struct spa_hook_list *list, struct spa_hook_list *save)
Definition hook.h:499
spa_hook_list_prepend
SPA_API_HOOK void spa_hook_list_prepend(struct spa_hook_list *list, struct spa_hook *hook, const void *funcs, void *data)
Prepend a hook.
Definition hook.h:458
spa_hook_list_append
SPA_API_HOOK void spa_hook_list_append(struct spa_hook_list *list, struct spa_hook *hook, const void *funcs, void *data)
Append a hook.
Definition hook.h:448
spa_hook_list_init
SPA_API_HOOK void spa_hook_list_init(struct spa_hook_list *list)
Initialize a hook list to the empty list.
Definition hook.h:437
SPA_CALLBACKS_INIT
#define SPA_CALLBACKS_INIT(_funcs, _data)
Initialize the set of functions funcs as a spa_callbacks, together with _data.
Definition hook.h:144
spa_list_is_initialized
SPA_API_LIST int spa_list_is_initialized(struct spa_list *list)
Definition list.h:52
spa_list_consume
#define spa_list_consume(pos, head, member)
Definition list.h:104
spa_list_insert_list
SPA_API_LIST void spa_list_insert_list(struct spa_list *list, struct spa_list *other)
Definition list.h:67
spa_list_init
SPA_API_LIST void spa_list_init(struct spa_list *list)
Definition list.h:47
spa_list_remove
SPA_API_LIST void spa_list_remove(struct spa_list *elem)
Definition list.h:77
spa_list_prepend
#define spa_list_prepend(list, item)
Definition list.h:92
spa_list_is_empty
#define spa_list_is_empty(l)
Definition list.h:57
spa_list_append
#define spa_list_append(list, item)
Definition list.h:89
spa_zero
#define spa_zero(x)
Definition defs.h:508
SPA_API_HOOK
#define SPA_API_HOOK
Definition hook.h:27
list.h
spa/utils/list.h
spa_callbacks
Callbacks, contains the structure with functions and the data passed to the functions.
Definition hook.h:126
spa_callbacks::funcs
const void * funcs
Definition hook.h:127
spa_hook_list
A list of hooks.
Definition hook.h:416
spa_hook_list::list
struct spa_list list
Definition hook.h:417
spa_hook
A hook, contains the structure with functions and the data passed to the functions.
Definition hook.h:427
spa_hook::removed
void(* removed)(struct spa_hook *hook)
callback and data for the hook list, private to the hook_list implementor
Definition hook.h:432
spa_hook::cb
struct spa_callbacks cb
Definition hook.h:429
spa_hook::link
struct spa_list link
Definition hook.h:428
spa_hook::priv
void * priv
Definition hook.h:433
spa_interface
Definition hook.h:148
spa_interface::version
uint32_t version
Definition hook.h:150
spa_interface::type
const char * type
Definition hook.h:149
spa_interface::cb
struct spa_callbacks cb
Definition hook.h:151
spa_list
Definition list.h:39