1 /* GStreamer
2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
4 *
5 * gstelement.h: Header for GstElement
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
21 */
24 #ifndef __GST_ELEMENT_H__
25 #define __GST_ELEMENT_H__
27 #include <gst/gstconfig.h>
28 #include <gst/gsttypes.h>
29 #include <gst/gstobject.h>
30 #include <gst/gstpad.h>
31 #include <gst/gstclock.h>
32 #include <gst/gstplugin.h>
33 #include <gst/gstpluginfeature.h>
34 #include <gst/gstindex.h>
35 #include <gst/gsttag.h>
37 G_BEGIN_DECLS
39 typedef struct _GstElementDetails GstElementDetails;
41 /* FIXME: need translatable stuff in here (how handle in registry)? */
42 struct _GstElementDetails {
43 gchar *longname; /* long, english name */
44 gchar *klass; /* type of element, as hierarchy */
45 gchar *description; /* insights of one form or another */
46 gchar *author; /* who wrote this thing? */
48 gpointer _gst_reserved[GST_PADDING];
49 };
50 #define GST_ELEMENT_DETAILS(longname,klass,description,author) \
51 { longname, klass, description, author, GST_PADDING_INIT }
52 #define GST_IS_ELEMENT_DETAILS(details) ( \
53 (details) && ((details)->longname != NULL) && ((details)->klass != NULL) \
54 && ((details)->description != NULL) && ((details)->author != NULL))
56 #define GST_NUM_STATES 4
58 /* NOTE: this probably should be done with an #ifdef to decide
59 * whether to safe-cast or to just do the non-checking cast.
60 */
61 #define GST_STATE(obj) (GST_ELEMENT(obj)->current_state)
62 #define GST_STATE_PENDING(obj) (GST_ELEMENT(obj)->pending_state)
64 /* Note: using 8 bit shift mostly "just because", it leaves us enough room to grow <g> */
65 #define GST_STATE_TRANSITION(obj) ((GST_STATE(obj)<<8) | GST_STATE_PENDING(obj))
66 #define GST_STATE_NULL_TO_READY ((GST_STATE_NULL<<8) | GST_STATE_READY)
67 #define GST_STATE_READY_TO_PAUSED ((GST_STATE_READY<<8) | GST_STATE_PAUSED)
68 #define GST_STATE_PAUSED_TO_PLAYING ((GST_STATE_PAUSED<<8) | GST_STATE_PLAYING)
69 #define GST_STATE_PLAYING_TO_PAUSED ((GST_STATE_PLAYING<<8) | GST_STATE_PAUSED)
70 #define GST_STATE_PAUSED_TO_READY ((GST_STATE_PAUSED<<8) | GST_STATE_READY)
71 #define GST_STATE_READY_TO_NULL ((GST_STATE_READY<<8) | GST_STATE_NULL)
73 extern GType _gst_element_type;
75 #define GST_TYPE_ELEMENT (_gst_element_type)
76 #define GST_IS_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_ELEMENT))
77 #define GST_IS_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_ELEMENT))
78 #define GST_ELEMENT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_ELEMENT, GstElementClass))
79 #define GST_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_ELEMENT, GstElement))
80 #define GST_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_ELEMENT, GstElementClass))
82 /* convenience functions */
83 #ifndef GST_DISABLE_DEPRECATED
84 #ifdef G_HAVE_ISO_VARARGS
85 #define GST_ELEMENT_QUERY_TYPE_FUNCTION(functionname, ...) \
86 GST_QUERY_TYPE_FUNCTION (GstElement*, functionname, __VA_ARGS__);
87 #define GST_ELEMENT_FORMATS_FUNCTION(functionname, ...) \
88 GST_FORMATS_FUNCTION (GstElement*, functionname, __VA_ARGS__);
89 #define GST_ELEMENT_EVENT_MASK_FUNCTION(functionname, ...) \
90 GST_EVENT_MASK_FUNCTION (GstElement*, functionname, __VA_ARGS__);
91 #elif defined(G_HAVE_GNUC_VARARGS)
92 #define GST_ELEMENT_QUERY_TYPE_FUNCTION(functionname, a...) \
93 GST_QUERY_TYPE_FUNCTION (GstElement*, functionname, a);
94 #define GST_ELEMENT_FORMATS_FUNCTION(functionname, a...) \
95 GST_FORMATS_FUNCTION (GstElement*, functionname, a);
96 #define GST_ELEMENT_EVENT_MASK_FUNCTION(functionname, a...) \
97 GST_EVENT_MASK_FUNCTION (GstElement*, functionname, a);
98 #endif
99 #endif
101 typedef enum {
102 /* element is complex (for some def.) and generally require a cothread */
103 GST_ELEMENT_COMPLEX = GST_OBJECT_FLAG_LAST,
104 /* input and output pads aren't directly coupled to each other
105 examples: queues, multi-output async readers, etc. */
106 GST_ELEMENT_DECOUPLED,
107 /* this element should be placed in a thread if at all possible */
108 GST_ELEMENT_THREAD_SUGGESTED,
109 /* this element, for some reason, has a loop function that performs
110 * an infinite loop without calls to gst_element_yield () */
111 GST_ELEMENT_INFINITE_LOOP,
112 /* there is a new loopfunction ready for placement */
113 GST_ELEMENT_NEW_LOOPFUNC,
114 /* if this element can handle events */
115 GST_ELEMENT_EVENT_AWARE,
116 /* use threadsafe property get/set implementation */
117 GST_ELEMENT_USE_THREADSAFE_PROPERTIES,
119 /* private flags that can be used by the scheduler */
120 GST_ELEMENT_SCHEDULER_PRIVATE1,
121 GST_ELEMENT_SCHEDULER_PRIVATE2,
123 /* ignore state changes from parent */
124 GST_ELEMENT_LOCKED_STATE,
126 /* element is in error */
127 GST_ELEMENT_IN_ERROR,
129 /* use some padding for future expansion */
130 GST_ELEMENT_FLAG_LAST = GST_OBJECT_FLAG_LAST + 16
131 } GstElementFlags;
133 #define GST_ELEMENT_IS_THREAD_SUGGESTED(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_THREAD_SUGGESTED))
134 #define GST_ELEMENT_IS_EVENT_AWARE(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_EVENT_AWARE))
135 #define GST_ELEMENT_IS_DECOUPLED(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_DECOUPLED))
137 #define GST_ELEMENT_NAME(obj) (GST_OBJECT_NAME(obj))
138 #define GST_ELEMENT_PARENT(obj) (GST_OBJECT_PARENT(obj))
139 #define GST_ELEMENT_MANAGER(obj) (((GstElement*)(obj))->manager)
140 #define GST_ELEMENT_SCHED(obj) (((GstElement*)(obj))->sched)
141 #define GST_ELEMENT_CLOCK(obj) (((GstElement*)(obj))->clock)
142 #define GST_ELEMENT_PADS(obj) ((obj)->pads)
144 #define GST_ELEMENT_ERROR(el, domain, code, message, debug) G_STMT_START { \
145 gchar *__msg = _gst_element_error_printf message; \
146 gchar *__dbg = _gst_element_error_printf debug; \
147 GST_ERROR_OBJECT (el, "%s", __msg); \
148 GST_ERROR_OBJECT (el, "%s", __dbg); \
149 gst_element_error_full (GST_ELEMENT(el), \
150 GST_ ## domain ## _ERROR, GST_ ## domain ## _ERROR_ ## code, \
151 __msg, __dbg, __FILE__, GST_FUNCTION, __LINE__); \
152 } G_STMT_END
154 typedef struct _GstElementFactory GstElementFactory;
155 typedef struct _GstElementFactoryClass GstElementFactoryClass;
157 typedef void (*GstElementLoopFunction) (GstElement *element);
158 typedef void (*GstElementPreRunFunction) (GstElement *element);
159 typedef void (*GstElementPostRunFunction) (GstElement *element);
161 struct _GstElement {
162 GstObject object;
164 /* element state and scheduling */
165 guint8 current_state;
166 guint8 pending_state;
167 GstElementLoopFunction loopfunc;
169 GstScheduler *sched;
170 gpointer sched_private;
172 /* allocated clock */
173 GstClock *clock;
174 GstClockTimeDiff base_time; /* NULL/READY: 0 - PAUSED: current time - PLAYING: difference to clock */
176 /* element pads */
177 guint16 numpads;
178 guint16 numsrcpads;
179 guint16 numsinkpads;
180 GList *pads;
182 GMutex *state_mutex;
183 GCond *state_cond;
185 GstElementPreRunFunction pre_run_func;
186 GstElementPostRunFunction post_run_func;
187 GAsyncQueue *prop_value_queue;
188 GMutex *property_mutex;
190 gpointer _gst_reserved[GST_PADDING];
191 };
193 struct _GstElementClass {
194 GstObjectClass parent_class;
196 /* the element details */
197 GstElementDetails details;
199 /* factory that the element was created from */
200 GstElementFactory *elementfactory;
202 /* templates for our pads */
203 GList *padtemplates;
204 gint numpadtemplates;
206 /* signal callbacks */
207 void (*state_change) (GstElement *element, GstElementState old, GstElementState state);
208 void (*new_pad) (GstElement *element, GstPad *pad);
209 void (*pad_removed) (GstElement *element, GstPad *pad);
210 void (*error) (GstElement *element, GstElement *source, GError *error, gchar *debug);
211 void (*eos) (GstElement *element);
212 void (*found_tag) (GstElement *element, GstElement *source, const GstTagList *tag_list);
214 /* local pointers for get/set */
215 void (*set_property) (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
216 void (*get_property) (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
218 /* vtable*/
219 gboolean (*release_locks) (GstElement *element);
221 /* query/convert/events functions */
222 const GstEventMask* (*get_event_masks) (GstElement *element);
223 gboolean (*send_event) (GstElement *element, GstEvent *event);
224 const GstFormat* (*get_formats) (GstElement *element);
225 gboolean (*convert) (GstElement *element,
226 GstFormat src_format, gint64 src_value,
227 GstFormat *dest_format, gint64 *dest_value);
228 const GstQueryType* (*get_query_types) (GstElement *element);
229 gboolean (*query) (GstElement *element, GstQueryType type,
230 GstFormat *format, gint64 *value);
232 /* change the element state */
233 GstElementStateReturn (*change_state) (GstElement *element);
235 /* request/release pads */
236 GstPad* (*request_new_pad) (GstElement *element, GstPadTemplate *templ, const gchar* name);
237 void (*release_pad) (GstElement *element, GstPad *pad);
239 /* set/get clocks */
240 GstClock* (*get_clock) (GstElement *element);
241 void (*set_clock) (GstElement *element, GstClock *clock);
243 /* index */
244 GstIndex* (*get_index) (GstElement *element);
245 void (*set_index) (GstElement *element, GstIndex *index);
247 GstElementStateReturn (*set_state) (GstElement *element, GstElementState state);
248 gpointer _gst_reserved[GST_PADDING];
249 };
251 void gst_element_class_add_pad_template (GstElementClass *klass, GstPadTemplate *templ);
252 void gst_element_class_install_std_props (GstElementClass *klass,
253 const gchar *first_name, ...);
254 void gst_element_class_set_details (GstElementClass *klass,
255 const GstElementDetails *details);
257 #define gst_element_default_deep_notify gst_object_default_deep_notify
259 void gst_element_default_error (GObject *object, GstObject *orig, GError *error, gchar *debug);
261 GType gst_element_get_type (void);
262 void gst_element_set_loop_function (GstElement *element,
263 GstElementLoopFunction loop);
265 #define gst_element_get_name(elem) gst_object_get_name(GST_OBJECT(elem))
266 #define gst_element_set_name(elem,name) gst_object_set_name(GST_OBJECT(elem),name)
267 #define gst_element_get_parent(elem) gst_object_get_parent(GST_OBJECT(elem))
268 #define gst_element_set_parent(elem,parent) gst_object_set_parent(GST_OBJECT(elem),parent)
270 /* threadsafe versions of their g_object_* counterparts */
271 void gst_element_set (GstElement *element, const gchar *first_property_name, ...);
272 void gst_element_get (GstElement *element, const gchar *first_property_name, ...);
273 void gst_element_set_valist (GstElement *element, const gchar *first_property_name,
274 va_list var_args);
275 void gst_element_get_valist (GstElement *element, const gchar *first_property_name,
276 va_list var_args);
277 void gst_element_set_property (GstElement *element, const gchar *property_name,
278 const GValue *value);
279 void gst_element_get_property (GstElement *element, const gchar *property_name,
280 GValue *value);
282 void gst_element_enable_threadsafe_properties (GstElement *element);
283 void gst_element_disable_threadsafe_properties (GstElement *element);
284 void gst_element_set_pending_properties (GstElement *element);
286 /* clocking */
287 gboolean gst_element_requires_clock (GstElement *element);
288 gboolean gst_element_provides_clock (GstElement *element);
289 GstClock* gst_element_get_clock (GstElement *element);
290 void gst_element_set_clock (GstElement *element, GstClock *clock);
291 GstClockReturn gst_element_clock_wait (GstElement *element,
292 GstClockID id, GstClockTimeDiff *jitter);
293 GstClockTime gst_element_get_time (GstElement *element);
294 gboolean gst_element_wait (GstElement *element, GstClockTime timestamp);
295 void gst_element_set_time (GstElement *element, GstClockTime time);
296 void gst_element_set_time_delay (GstElement *element, GstClockTime time, GstClockTime delay);
298 void gst_element_adjust_time (GstElement *element, GstClockTimeDiff diff);
300 /* indexs */
301 gboolean gst_element_is_indexable (GstElement *element);
302 void gst_element_set_index (GstElement *element, GstIndex *index);
303 GstIndex* gst_element_get_index (GstElement *element);
306 gboolean gst_element_release_locks (GstElement *element);
308 void gst_element_yield (GstElement *element);
309 gboolean gst_element_interrupt (GstElement *element);
310 void gst_element_set_scheduler (GstElement *element, GstScheduler *sched);
311 GstScheduler* gst_element_get_scheduler (GstElement *element);
313 void gst_element_add_pad (GstElement *element, GstPad *pad);
314 void gst_element_remove_pad (GstElement *element, GstPad *pad);
315 GstPad * gst_element_add_ghost_pad (GstElement *element, GstPad *pad, const gchar *name);
316 void gst_element_remove_ghost_pad (GstElement *element, GstPad *pad);
318 GstPad* gst_element_get_pad (GstElement *element, const gchar *name);
319 GstPad* gst_element_get_static_pad (GstElement *element, const gchar *name);
320 GstPad* gst_element_get_request_pad (GstElement *element, const gchar *name);
321 void gst_element_release_request_pad (GstElement *element, GstPad *pad);
323 G_CONST_RETURN GList*
324 gst_element_get_pad_list (GstElement *element);
325 GstPad* gst_element_get_compatible_pad (GstElement *element, GstPad *pad);
326 GstPad* gst_element_get_compatible_pad_filtered (GstElement *element, GstPad *pad,
327 const GstCaps *filtercaps);
329 GstPadTemplate* gst_element_class_get_pad_template (GstElementClass *element_class, const gchar *name);
330 GList* gst_element_class_get_pad_template_list (GstElementClass *element_class);
331 GstPadTemplate* gst_element_get_pad_template (GstElement *element, const gchar *name);
332 GList* gst_element_get_pad_template_list (GstElement *element);
333 GstPadTemplate* gst_element_get_compatible_pad_template (GstElement *element, GstPadTemplate *compattempl);
335 gboolean gst_element_link (GstElement *src, GstElement *dest);
336 gboolean gst_element_link_many (GstElement *element_1,
337 GstElement *element_2, ...);
338 gboolean gst_element_link_filtered (GstElement *src, GstElement *dest,
339 const GstCaps *filtercaps);
340 void gst_element_unlink (GstElement *src, GstElement *dest);
341 void gst_element_unlink_many (GstElement *element_1,
342 GstElement *element_2, ...);
344 gboolean gst_element_link_pads (GstElement *src, const gchar *srcpadname,
345 GstElement *dest, const gchar *destpadname);
346 gboolean gst_element_link_pads_filtered (GstElement *src, const gchar *srcpadname,
347 GstElement *dest, const gchar *destpadname,
348 const GstCaps *filtercaps);
349 void gst_element_unlink_pads (GstElement *src, const gchar *srcpadname,
350 GstElement *dest, const gchar *destpadname);
352 G_CONST_RETURN GstEventMask*
353 gst_element_get_event_masks (GstElement *element);
354 gboolean gst_element_send_event (GstElement *element, GstEvent *event);
355 gboolean gst_element_seek (GstElement *element, GstSeekType seek_type,
356 guint64 offset);
357 G_CONST_RETURN GstQueryType*
358 gst_element_get_query_types (GstElement *element);
359 gboolean gst_element_query (GstElement *element, GstQueryType type,
360 GstFormat *format, gint64 *value);
361 G_CONST_RETURN GstFormat*
362 gst_element_get_formats (GstElement *element);
363 gboolean gst_element_convert (GstElement *element,
364 GstFormat src_format, gint64 src_value,
365 GstFormat *dest_format, gint64 *dest_value);
367 void gst_element_found_tags (GstElement *element, const GstTagList *tag_list);
368 void gst_element_found_tags_for_pad (GstElement *element, GstPad *pad, GstClockTime timestamp,
369 GstTagList *list);
371 void gst_element_set_eos (GstElement *element);
373 gchar * _gst_element_error_printf (const gchar *format, ...);
374 void gst_element_error_full (GstElement *element, GQuark domain, gint code,
375 gchar *message, gchar *debug,
376 const gchar *file, const gchar *function, gint line);
378 gboolean gst_element_is_locked_state (GstElement *element);
379 void gst_element_set_locked_state (GstElement *element, gboolean locked_state);
380 gboolean gst_element_sync_state_with_parent (GstElement *element);
382 GstElementState gst_element_get_state (GstElement *element);
383 GstElementStateReturn gst_element_set_state (GstElement *element, GstElementState state);
385 void gst_element_wait_state_change (GstElement *element);
387 G_CONST_RETURN gchar* gst_element_state_get_name (GstElementState state);
389 GstElementFactory* gst_element_get_factory (GstElement *element);
391 GstBin* gst_element_get_managing_bin (GstElement *element);
394 /*
395 *
396 * factories stuff
397 *
398 **/
400 #define GST_TYPE_ELEMENT_FACTORY (gst_element_factory_get_type())
401 #define GST_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ELEMENT_FACTORY,\
402 GstElementFactory))
403 #define GST_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ELEMENT_FACTORY,\
404 GstElementFactoryClass))
405 #define GST_IS_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ELEMENT_FACTORY))
406 #define GST_IS_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ELEMENT_FACTORY))
408 struct _GstElementFactory {
409 GstPluginFeature parent;
411 GType type; /* unique GType of element or 0 if not loaded */
413 GstElementDetails details;
415 GList * padtemplates;
416 guint numpadtemplates;
418 /* URI interface stuff */
419 guint uri_type;
420 gchar ** uri_protocols;
422 GList * interfaces; /* interfaces this element implements */
424 gpointer _gst_reserved[GST_PADDING];
425 };
427 struct _GstElementFactoryClass {
428 GstPluginFeatureClass parent_class;
430 gpointer _gst_reserved[GST_PADDING];
431 };
433 GType gst_element_factory_get_type (void);
435 gboolean gst_element_register (GstPlugin *plugin,
436 const gchar *name,
437 guint rank,
438 GType type);
440 GstElementFactory * gst_element_factory_find (const gchar *name);
441 GType gst_element_factory_get_element_type (GstElementFactory *factory);
442 G_CONST_RETURN gchar * gst_element_factory_get_longname (GstElementFactory *factory);
443 G_CONST_RETURN gchar * gst_element_factory_get_klass (GstElementFactory *factory);
444 G_CONST_RETURN gchar * gst_element_factory_get_description (GstElementFactory *factory);
445 G_CONST_RETURN gchar * gst_element_factory_get_author (GstElementFactory *factory);
446 guint gst_element_factory_get_num_pad_templates (GstElementFactory *factory);
447 G_CONST_RETURN GList * gst_element_factory_get_pad_templates (GstElementFactory *factory);
448 guint gst_element_factory_get_uri_type (GstElementFactory *factory);
449 gchar ** gst_element_factory_get_uri_protocols (GstElementFactory *factory);
451 GstElement* gst_element_factory_create (GstElementFactory *factory,
452 const gchar *name);
453 GstElement* gst_element_factory_make (const gchar *factoryname, const gchar *name);
455 gboolean gst_element_factory_can_src_caps (GstElementFactory *factory,
456 const GstCaps *caps);
457 gboolean gst_element_factory_can_sink_caps (GstElementFactory *factory,
458 const GstCaps *caps);
460 void __gst_element_factory_add_pad_template (GstElementFactory *elementfactory,
461 GstPadTemplate *templ);
462 void __gst_element_factory_add_interface (GstElementFactory *elementfactory,
463 const gchar *interfacename);
466 G_END_DECLS
469 #endif /* __GST_ELEMENT_H__ */