2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
5 * gstelement.h: Header for GstElement
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.
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.
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.
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>
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];
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.
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);
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
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", __dbg); \
148 gst_element_error_full (GST_ELEMENT(el), \
149 GST_ ## domain ## _ERROR, GST_ ## domain ## _ERROR_ ## code, \
150 __msg, __dbg, __FILE__, GST_FUNCTION, __LINE__); \
153 typedef struct _GstElementFactory GstElementFactory;
154 typedef struct _GstElementFactoryClass GstElementFactoryClass;
156 typedef void (*GstElementLoopFunction) (GstElement *element);
157 typedef void (*GstElementPreRunFunction) (GstElement *element);
158 typedef void (*GstElementPostRunFunction) (GstElement *element);
163 /* element state and scheduling */
164 guint8 current_state;
165 guint8 pending_state;
166 GstElementLoopFunction loopfunc;
169 gpointer sched_private;
171 /* allocated clock */
173 GstClockTimeDiff base_time; /* NULL/READY: 0 - PAUSED: current time - PLAYING: difference to clock */
184 GstElementPreRunFunction pre_run_func;
185 GstElementPostRunFunction post_run_func;
186 GAsyncQueue *prop_value_queue;
187 GMutex *property_mutex;
189 gpointer _gst_reserved[GST_PADDING];
192 struct _GstElementClass {
193 GstObjectClass parent_class;
195 /* the element details */
196 GstElementDetails details;
198 /* factory that the element was created from */
199 GstElementFactory *elementfactory;
201 /* templates for our pads */
203 gint numpadtemplates;
205 /* signal callbacks */
206 void (*state_change) (GstElement *element, GstElementState old, GstElementState state);
207 void (*new_pad) (GstElement *element, GstPad *pad);
208 void (*pad_removed) (GstElement *element, GstPad *pad);
209 void (*error) (GstElement *element, GstElement *source, GError *error, gchar *debug);
210 void (*eos) (GstElement *element);
211 void (*found_tag) (GstElement *element, GstElement *source, const GstTagList *tag_list);
213 /* local pointers for get/set */
214 void (*set_property) (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
215 void (*get_property) (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
218 gboolean (*release_locks) (GstElement *element);
220 /* query/convert/events functions */
221 const GstEventMask* (*get_event_masks) (GstElement *element);
222 gboolean (*send_event) (GstElement *element, GstEvent *event);
223 const GstFormat* (*get_formats) (GstElement *element);
224 gboolean (*convert) (GstElement *element,
225 GstFormat src_format, gint64 src_value,
226 GstFormat *dest_format, gint64 *dest_value);
227 const GstQueryType* (*get_query_types) (GstElement *element);
228 gboolean (*query) (GstElement *element, GstQueryType type,
229 GstFormat *format, gint64 *value);
231 /* change the element state */
232 GstElementStateReturn (*change_state) (GstElement *element);
234 /* request/release pads */
235 GstPad* (*request_new_pad) (GstElement *element, GstPadTemplate *templ, const gchar* name);
236 void (*release_pad) (GstElement *element, GstPad *pad);
239 GstClock* (*get_clock) (GstElement *element);
240 void (*set_clock) (GstElement *element, GstClock *clock);
243 GstIndex* (*get_index) (GstElement *element);
244 void (*set_index) (GstElement *element, GstIndex *index);
246 GstElementStateReturn (*set_state) (GstElement *element, GstElementState state);
247 gpointer _gst_reserved[GST_PADDING];
250 void gst_element_class_add_pad_template (GstElementClass *klass, GstPadTemplate *templ);
251 void gst_element_class_install_std_props (GstElementClass *klass,
252 const gchar *first_name, ...);
253 void gst_element_class_set_details (GstElementClass *klass,
254 const GstElementDetails *details);
256 #define gst_element_default_deep_notify gst_object_default_deep_notify
258 void gst_element_default_error (GObject *object, GstObject *orig, GError *error, gchar *debug);
260 GType gst_element_get_type (void);
261 void gst_element_set_loop_function (GstElement *element,
262 GstElementLoopFunction loop);
264 #define gst_element_get_name(elem) gst_object_get_name(GST_OBJECT(elem))
265 #define gst_element_set_name(elem,name) gst_object_set_name(GST_OBJECT(elem),name)
266 #define gst_element_get_parent(elem) gst_object_get_parent(GST_OBJECT(elem))
267 #define gst_element_set_parent(elem,parent) gst_object_set_parent(GST_OBJECT(elem),parent)
269 /* threadsafe versions of their g_object_* counterparts */
270 void gst_element_set (GstElement *element, const gchar *first_property_name, ...);
271 void gst_element_get (GstElement *element, const gchar *first_property_name, ...);
272 void gst_element_set_valist (GstElement *element, const gchar *first_property_name,
274 void gst_element_get_valist (GstElement *element, const gchar *first_property_name,
276 void gst_element_set_property (GstElement *element, const gchar *property_name,
277 const GValue *value);
278 void gst_element_get_property (GstElement *element, const gchar *property_name,
281 void gst_element_enable_threadsafe_properties (GstElement *element);
282 void gst_element_disable_threadsafe_properties (GstElement *element);
283 void gst_element_set_pending_properties (GstElement *element);
286 gboolean gst_element_requires_clock (GstElement *element);
287 gboolean gst_element_provides_clock (GstElement *element);
288 GstClock* gst_element_get_clock (GstElement *element);
289 void gst_element_set_clock (GstElement *element, GstClock *clock);
290 GstClockReturn gst_element_clock_wait (GstElement *element,
291 GstClockID id, GstClockTimeDiff *jitter);
292 GstClockTime gst_element_get_time (GstElement *element);
293 gboolean gst_element_wait (GstElement *element, GstClockTime timestamp);
294 void gst_element_set_time (GstElement *element, GstClockTime time);
295 void gst_element_adjust_time (GstElement *element, GstClockTimeDiff diff);
298 gboolean gst_element_is_indexable (GstElement *element);
299 void gst_element_set_index (GstElement *element, GstIndex *index);
300 GstIndex* gst_element_get_index (GstElement *element);
303 gboolean gst_element_release_locks (GstElement *element);
305 void gst_element_yield (GstElement *element);
306 gboolean gst_element_interrupt (GstElement *element);
307 void gst_element_set_scheduler (GstElement *element, GstScheduler *sched);
308 GstScheduler* gst_element_get_scheduler (GstElement *element);
310 void gst_element_add_pad (GstElement *element, GstPad *pad);
311 void gst_element_remove_pad (GstElement *element, GstPad *pad);
312 GstPad * gst_element_add_ghost_pad (GstElement *element, GstPad *pad, const gchar *name);
313 void gst_element_remove_ghost_pad (GstElement *element, GstPad *pad);
315 GstPad* gst_element_get_pad (GstElement *element, const gchar *name);
316 GstPad* gst_element_get_static_pad (GstElement *element, const gchar *name);
317 GstPad* gst_element_get_request_pad (GstElement *element, const gchar *name);
318 void gst_element_release_request_pad (GstElement *element, GstPad *pad);
320 G_CONST_RETURN GList*
321 gst_element_get_pad_list (GstElement *element);
322 GstPad* gst_element_get_compatible_pad (GstElement *element, GstPad *pad);
323 GstPad* gst_element_get_compatible_pad_filtered (GstElement *element, GstPad *pad,
324 const GstCaps *filtercaps);
326 GstPadTemplate* gst_element_class_get_pad_template (GstElementClass *element_class, const gchar *name);
327 GList* gst_element_class_get_pad_template_list (GstElementClass *element_class);
328 GstPadTemplate* gst_element_get_pad_template (GstElement *element, const gchar *name);
329 GList* gst_element_get_pad_template_list (GstElement *element);
330 GstPadTemplate* gst_element_get_compatible_pad_template (GstElement *element, GstPadTemplate *compattempl);
332 gboolean gst_element_link (GstElement *src, GstElement *dest);
333 gboolean gst_element_link_many (GstElement *element_1,
334 GstElement *element_2, ...);
335 gboolean gst_element_link_filtered (GstElement *src, GstElement *dest,
336 const GstCaps *filtercaps);
337 void gst_element_unlink (GstElement *src, GstElement *dest);
338 void gst_element_unlink_many (GstElement *element_1,
339 GstElement *element_2, ...);
341 gboolean gst_element_link_pads (GstElement *src, const gchar *srcpadname,
342 GstElement *dest, const gchar *destpadname);
343 gboolean gst_element_link_pads_filtered (GstElement *src, const gchar *srcpadname,
344 GstElement *dest, const gchar *destpadname,
345 const GstCaps *filtercaps);
346 void gst_element_unlink_pads (GstElement *src, const gchar *srcpadname,
347 GstElement *dest, const gchar *destpadname);
349 G_CONST_RETURN GstEventMask*
350 gst_element_get_event_masks (GstElement *element);
351 gboolean gst_element_send_event (GstElement *element, GstEvent *event);
352 gboolean gst_element_seek (GstElement *element, GstSeekType seek_type,
354 G_CONST_RETURN GstQueryType*
355 gst_element_get_query_types (GstElement *element);
356 gboolean gst_element_query (GstElement *element, GstQueryType type,
357 GstFormat *format, gint64 *value);
358 G_CONST_RETURN GstFormat*
359 gst_element_get_formats (GstElement *element);
360 gboolean gst_element_convert (GstElement *element,
361 GstFormat src_format, gint64 src_value,
362 GstFormat *dest_format, gint64 *dest_value);
364 void gst_element_found_tags (GstElement *element, const GstTagList *tag_list);
365 void gst_element_found_tags_for_pad (GstElement *element, GstPad *pad, GstClockTime timestamp,
368 void gst_element_set_eos (GstElement *element);
370 gchar * _gst_element_error_printf (const gchar *format, ...);
371 void gst_element_error_full (GstElement *element, GQuark domain, gint code,
372 gchar *message, gchar *debug,
373 const gchar *file, const gchar *function, gint line);
375 gboolean gst_element_is_locked_state (GstElement *element);
376 void gst_element_set_locked_state (GstElement *element, gboolean locked_state);
377 gboolean gst_element_sync_state_with_parent (GstElement *element);
379 GstElementState gst_element_get_state (GstElement *element);
380 GstElementStateReturn gst_element_set_state (GstElement *element, GstElementState state);
382 void gst_element_wait_state_change (GstElement *element);
384 G_CONST_RETURN gchar* gst_element_state_get_name (GstElementState state);
386 GstElementFactory* gst_element_get_factory (GstElement *element);
388 GstBin* gst_element_get_managing_bin (GstElement *element);
397 #define GST_TYPE_ELEMENT_FACTORY (gst_element_factory_get_type())
398 #define GST_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ELEMENT_FACTORY,\
400 #define GST_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ELEMENT_FACTORY,\
401 GstElementFactoryClass))
402 #define GST_IS_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ELEMENT_FACTORY))
403 #define GST_IS_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ELEMENT_FACTORY))
405 struct _GstElementFactory {
406 GstPluginFeature parent;
408 GType type; /* unique GType of element or 0 if not loaded */
410 GstElementDetails details;
412 GList * padtemplates;
413 guint numpadtemplates;
415 /* URI interface stuff */
417 gchar ** uri_protocols;
419 GList * interfaces; /* interfaces this element implements */
421 gpointer _gst_reserved[GST_PADDING];
424 struct _GstElementFactoryClass {
425 GstPluginFeatureClass parent_class;
427 gpointer _gst_reserved[GST_PADDING];
430 GType gst_element_factory_get_type (void);
432 gboolean gst_element_register (GstPlugin *plugin,
433 const gchar *elementname,
437 GstElementFactory * gst_element_factory_find (const gchar *name);
438 GType gst_element_factory_get_element_type (GstElementFactory *factory);
439 G_CONST_RETURN gchar * gst_element_factory_get_longname (GstElementFactory *factory);
440 G_CONST_RETURN gchar * gst_element_factory_get_klass (GstElementFactory *factory);
441 G_CONST_RETURN gchar * gst_element_factory_get_description (GstElementFactory *factory);
442 G_CONST_RETURN gchar * gst_element_factory_get_author (GstElementFactory *factory);
443 guint gst_element_factory_get_num_pad_templates (GstElementFactory *factory);
444 G_CONST_RETURN GList * gst_element_factory_get_pad_templates (GstElementFactory *factory);
445 guint gst_element_factory_get_uri_type (GstElementFactory *factory);
446 gchar ** gst_element_factory_get_uri_protocols (GstElementFactory *factory);
448 GstElement* gst_element_factory_create (GstElementFactory *factory,
450 GstElement* gst_element_factory_make (const gchar *factoryname, const gchar *name);
452 gboolean gst_element_factory_can_src_caps (GstElementFactory *factory,
453 const GstCaps *caps);
454 gboolean gst_element_factory_can_sink_caps (GstElementFactory *factory,
455 const GstCaps *caps);
457 void __gst_element_factory_add_pad_template (GstElementFactory *elementfactory,
458 GstPadTemplate *templ);
459 void __gst_element_factory_add_interface (GstElementFactory *elementfactory,
460 const gchar *interfacename);
466 #endif /* __GST_ELEMENT_H__ */