PipeWire: hook.h Source File

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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
9extern "C" {
10#endif
11
12#include <spa/utils/defs.h>
13#include <spa/utils/list.h>
14
110struct spa_callbacks {
111 const void *funcs;
112 void *data;
113};
114
116#define SPA_CALLBACK_VERSION_MIN(c,v) ((c) && ((v) == 0 || (c)->version > (v)-1))
117
119#define SPA_CALLBACK_CHECK(c,m,v) (SPA_CALLBACK_VERSION_MIN(c,v) && (c)->m)
120
125#define SPA_CALLBACKS_INIT(_funcs,_data) ((struct spa_callbacks){ (_funcs), (_data), })
126
129struct spa_interface {
130 const char *type;
131 uint32_t version;
132 struct spa_callbacks cb;
133};
134
148#define SPA_INTERFACE_INIT(_type,_version,_funcs,_data) \
149 ((struct spa_interface){ (_type), (_version), SPA_CALLBACKS_INIT(_funcs,_data), })
150
156#define spa_callbacks_call(callbacks,type,method,vers,...) \
157({ \
158 const type *_f = (const type *) (callbacks)->funcs; \
159 bool _res = SPA_CALLBACK_CHECK(_f,method,vers); \
160 if (SPA_LIKELY(_res)) \
161 _f->method((callbacks)->data, ## __VA_ARGS__); \
162 _res; \
163})
164
165#define spa_callbacks_call_fast(callbacks,type,method,vers,...) \
166({ \
167 const type *_f = (const type *) (callbacks)->funcs; \
168 _f->method((callbacks)->data, ## __VA_ARGS__); \
169 true; \
170})
171
172
176#define spa_callback_version_min(callbacks,type,vers) \
177({ \
178 const type *_f = (const type *) (callbacks)->funcs; \
179 SPA_CALLBACK_VERSION_MIN(_f,vers); \
180})
181
186#define spa_callback_check(callbacks,type,method,vers) \
187({ \
188 const type *_f = (const type *) (callbacks)->funcs; \
189 SPA_CALLBACK_CHECK(_f,method,vers); \
190})
191
198#define spa_callbacks_call_res(callbacks,type,res,method,vers,...) \
199({ \
200 const type *_f = (const type *) (callbacks)->funcs; \
201 if (SPA_LIKELY(SPA_CALLBACK_CHECK(_f,method,vers))) \
202 res = _f->method((callbacks)->data, ## __VA_ARGS__); \
203 res; \
204})
205#define spa_callbacks_call_fast_res(callbacks,type,res,method,vers,...) \
206({ \
207 const type *_f = (const type *) (callbacks)->funcs; \
208 res = _f->method((callbacks)->data, ## __VA_ARGS__); \
209})
210
214#define spa_interface_callback_version_min(iface,method_type,vers) \
215 spa_callback_version_min(&(iface)->cb, method_type, vers)
216
221#define spa_interface_callback_check(iface,method_type,method,vers) \
222 spa_callback_check(&(iface)->cb, method_type, method, vers)
223
229#define spa_interface_call(iface,method_type,method,vers,...) \
230 spa_callbacks_call(&(iface)->cb,method_type,method,vers,##__VA_ARGS__)
231
232#define spa_interface_call_fast(iface,method_type,method,vers,...) \
233 spa_callbacks_call_fast(&(iface)->cb,method_type,method,vers,##__VA_ARGS__)
234
242#define spa_interface_call_res(iface,method_type,res,method,vers,...) \
243 spa_callbacks_call_res(&(iface)->cb,method_type,res,method,vers,##__VA_ARGS__)
244
245#define spa_interface_call_fast_res(iface,method_type,res,method,vers,...) \
246 spa_callbacks_call_fast_res(&(iface)->cb,method_type,res,method,vers,##__VA_ARGS__)
247
330struct spa_hook_list {
331 struct spa_list list;
332};
333
334
341struct spa_hook {
342 struct spa_list link;
343 struct spa_callbacks cb;
346 void (*removed) (struct spa_hook *hook);
347 void *priv;
348};
349
351 static inline void spa_hook_list_init(struct spa_hook_list *list)
352{
353 spa_list_init(&list->list);
354}
355
356 static inline bool spa_hook_list_is_empty(struct spa_hook_list *list)
357{
358 return spa_list_is_empty(&list->list);
359}
360
362static inline void spa_hook_list_append(struct spa_hook_list *list,
363 struct spa_hook *hook,
364 const void *funcs, void *data)
365{
366 spa_zero(*hook);
367 hook->cb = SPA_CALLBACKS_INIT(funcs, data);
368 spa_list_append(&list->list, &hook->link);
369}
370
372static inline void spa_hook_list_prepend(struct spa_hook_list *list,
373 struct spa_hook *hook,
374 const void *funcs, void *data)
375{
376 spa_zero(*hook);
377 hook->cb = SPA_CALLBACKS_INIT(funcs, data);
378 spa_list_prepend(&list->list, &hook->link);
379}
380
382static inline void spa_hook_remove(struct spa_hook *hook)
383{
384 if (spa_list_is_initialized(&hook->link))
385 spa_list_remove(&hook->link);
386 if (hook->removed)
387 hook->removed(hook);
388}
389
391 static inline void spa_hook_list_clean(struct spa_hook_list *list)
392{
393 struct spa_hook *h;
394 spa_list_consume(h, &list->list, link)
395 spa_hook_remove(h);
396}
397
398static inline void
399 spa_hook_list_isolate(struct spa_hook_list *list,
400 struct spa_hook_list *save,
401 struct spa_hook *hook,
402 const void *funcs, void *data)
403{
404 /* init save list and move hooks to it */
405 spa_hook_list_init(save);
406 spa_list_insert_list(&save->list, &list->list);
407 /* init hooks and add single hook */
408 spa_hook_list_init(list);
409 spa_hook_list_append(list, hook, funcs, data);
410}
411
412static inline void
413 spa_hook_list_join(struct spa_hook_list *list,
414 struct spa_hook_list *save)
415{
416 spa_list_insert_list(&list->list, &save->list);
417}
418
419#define spa_hook_list_call_simple(l,type,method,vers,...) \
420({ \
421 struct spa_hook_list *_l = l; \
422 struct spa_hook *_h, *_t; \
423 spa_list_for_each_safe(_h, _t, &_l->list, link) \
424 spa_callbacks_call(&_h->cb,type,method,vers, ## __VA_ARGS__); \
425})
426
430#define spa_hook_list_do_call(l,start,type,method,vers,once,...) \
431({ \
432 struct spa_hook_list *_list = l; \
433 struct spa_list *_s = start ? (struct spa_list *)start : &_list->list; \
434 struct spa_hook _cursor = { 0 }, *_ci; \
435 int _count = 0; \
436 spa_list_cursor_start(_cursor, _s, link); \
437 spa_list_for_each_cursor(_ci, _cursor, &_list->list, link) { \
438 if (spa_callbacks_call(&_ci->cb,type,method,vers, ## __VA_ARGS__)) { \
439 _count++; \
440 if (once) \
441 break; \
442 } \
443 } \
444 spa_list_cursor_end(_cursor, link); \
445 _count; \
446})
447
452#define spa_hook_list_call(l,t,m,v,...) spa_hook_list_do_call(l,NULL,t,m,v,false,##__VA_ARGS__)
458#define spa_hook_list_call_once(l,t,m,v,...) spa_hook_list_do_call(l,NULL,t,m,v,true,##__VA_ARGS__)
459
460#define spa_hook_list_call_start(l,s,t,m,v,...) spa_hook_list_do_call(l,s,t,m,v,false,##__VA_ARGS__)
461#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__)
462
467#ifdef __cplusplus
468}
469#endif
470
471#endif /* SPA_HOOK_H */
defs.h
spa/utils/defs.h
spa_hook_list_is_empty
static bool spa_hook_list_is_empty(struct spa_hook_list *list)
Definition hook.h:365
spa_hook_list_append
static 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:371
spa_hook_list_join
static void spa_hook_list_join(struct spa_hook_list *list, struct spa_hook_list *save)
Definition hook.h:422
spa_hook_list_init
static void spa_hook_list_init(struct spa_hook_list *list)
Initialize a hook list to the empty list.
Definition hook.h:360
spa_hook_remove
static void spa_hook_remove(struct spa_hook *hook)
Remove a hook.
Definition hook.h:391
spa_hook_list_clean
static void spa_hook_list_clean(struct spa_hook_list *list)
Remove all hooks from the list.
Definition hook.h:400
spa_hook_list_prepend
static 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:381
spa_hook_list_isolate
static 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:408
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:134
spa_list_is_initialized
static int spa_list_is_initialized(struct spa_list *list)
Definition list.h:40
spa_list_consume
#define spa_list_consume(pos, head, member)
Definition list.h:92
spa_list_init
static void spa_list_init(struct spa_list *list)
Definition list.h:35
spa_list_remove
static void spa_list_remove(struct spa_list *elem)
Definition list.h:65
spa_list_prepend
#define spa_list_prepend(list, item)
Definition list.h:80
spa_list_is_empty
#define spa_list_is_empty(l)
Definition list.h:45
spa_list_append
#define spa_list_append(list, item)
Definition list.h:77
spa_list_insert_list
static void spa_list_insert_list(struct spa_list *list, struct spa_list *other)
Definition list.h:55
spa_zero
#define spa_zero(x)
Definition defs.h:417
list.h
spa/utils/list.h
spa_callbacks
Callbacks, contains the structure with functions and the data passed to the functions.
Definition hook.h:116
spa_callbacks::funcs
const void * funcs
Definition hook.h:117
spa_callbacks::data
void * data
Definition hook.h:118
spa_hook_list
A list of hooks.
Definition hook.h:339
spa_hook_list::list
struct spa_list list
Definition hook.h:340
spa_hook
A hook, contains the structure with functions and the data passed to the functions.
Definition hook.h:350
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:355
spa_hook::cb
struct spa_callbacks cb
Definition hook.h:352
spa_hook::link
struct spa_list link
Definition hook.h:351
spa_hook::priv
void * priv
Definition hook.h:356
spa_interface
Definition hook.h:138
spa_interface::version
uint32_t version
Definition hook.h:140
spa_interface::type
const char * type
Definition hook.h:139
spa_interface::cb
struct spa_callbacks cb
Definition hook.h:141
spa_list
Definition list.h:27