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? */
50 #define GST_ELEMENT_DETAILS(longname,klass,description,author) \
51 { longname, klass, description, author, GST_STRUCT_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)
77 #define GST_ELEMENT_CAST(obj) ((GstElement*)(obj))
78 #define GST_ELEMENT_CLASS_CAST(klass) ((GstElementClass*)(klass))
79 #define GST_IS_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_ELEMENT))
80 #define GST_IS_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_ELEMENT))
81 #define GST_ELEMENT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_ELEMENT, GstElementClass))
83 #ifdef GST_TYPE_PARANOID
84 # define GST_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_ELEMENT, GstElement))
85 # define GST_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_ELEMENT, GstElementClass))
87 # define GST_ELEMENT GST_ELEMENT_CAST
88 # define GST_ELEMENT_CLASS GST_ELEMENT_CLASS_CAST
91 /* convenience functions */
92 #ifdef G_HAVE_ISO_VARARGS
93 #define GST_ELEMENT_QUERY_TYPE_FUNCTION(functionname, ...) \
94 GST_QUERY_TYPE_FUNCTION (GstElement*, functionname, __VA_ARGS__);
95 #define GST_ELEMENT_FORMATS_FUNCTION(functionname, ...) \
96 GST_FORMATS_FUNCTION (GstElement*, functionname, __VA_ARGS__);
97 #define GST_ELEMENT_EVENT_MASK_FUNCTION(functionname, ...) \
98 GST_EVENT_MASK_FUNCTION (GstElement*, functionname, __VA_ARGS__);
99 #elif defined(G_HAVE_GNUC_VARARGS)
100 #define GST_ELEMENT_QUERY_TYPE_FUNCTION(functionname, a...) \
101 GST_QUERY_TYPE_FUNCTION (GstElement*, functionname, a);
102 #define GST_ELEMENT_FORMATS_FUNCTION(functionname, a...) \
103 GST_FORMATS_FUNCTION (GstElement*, functionname, a);
104 #define GST_ELEMENT_EVENT_MASK_FUNCTION(functionname, a...) \
105 GST_EVENT_MASK_FUNCTION (GstElement*, functionname, a);
109 /* element is complex (for some def.) and generally require a cothread */
110 GST_ELEMENT_COMPLEX = GST_OBJECT_FLAG_LAST,
111 /* input and output pads aren't directly coupled to each other
112 examples: queues, multi-output async readers, etc. */
113 GST_ELEMENT_DECOUPLED,
114 /* this element should be placed in a thread if at all possible */
115 GST_ELEMENT_THREAD_SUGGESTED,
116 /* this element, for some reason, has a loop function that performs
117 * an infinite loop without calls to gst_element_yield () */
118 GST_ELEMENT_INFINITE_LOOP,
119 /* there is a new loopfunction ready for placement */
120 GST_ELEMENT_NEW_LOOPFUNC,
121 /* if this element can handle events */
122 GST_ELEMENT_EVENT_AWARE,
123 /* use threadsafe property get/set implementation */
124 GST_ELEMENT_USE_THREADSAFE_PROPERTIES,
126 /* private flags that can be used by the scheduler */
127 GST_ELEMENT_SCHEDULER_PRIVATE1,
128 GST_ELEMENT_SCHEDULER_PRIVATE2,
130 /* ignore state changes from parent */
131 GST_ELEMENT_LOCKED_STATE,
133 /* element is in error */
136 /* use some padding for future expansion */
137 GST_ELEMENT_FLAG_LAST = GST_OBJECT_FLAG_LAST + 16
140 #define GST_ELEMENT_IS_THREAD_SUGGESTED(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_THREAD_SUGGESTED))
141 #define GST_ELEMENT_IS_EVENT_AWARE(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_EVENT_AWARE))
142 #define GST_ELEMENT_IS_DECOUPLED(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_DECOUPLED))
144 #define GST_ELEMENT_NAME(obj) (GST_OBJECT_NAME(obj))
145 #define GST_ELEMENT_PARENT(obj) (GST_OBJECT_PARENT(obj))
146 #define GST_ELEMENT_MANAGER(obj) (((GstElement*)(obj))->manager)
147 #define GST_ELEMENT_SCHED(obj) (((GstElement*)(obj))->sched)
148 #define GST_ELEMENT_CLOCK(obj) (((GstElement*)(obj))->clock)
149 #define GST_ELEMENT_PADS(obj) ((obj)->pads)
151 typedef struct _GstElementFactory GstElementFactory;
152 typedef struct _GstElementFactoryClass GstElementFactoryClass;
154 typedef void (*GstElementLoopFunction) (GstElement *element);
155 typedef void (*GstElementPreRunFunction) (GstElement *element);
156 typedef void (*GstElementPostRunFunction) (GstElement *element);
161 /* element state and scheduling */
162 guint8 current_state;
163 guint8 pending_state;
164 GstElementLoopFunction loopfunc;
167 gpointer sched_private;
169 /* allocated clock */
171 GstClockTime base_time;
182 GstElementPreRunFunction pre_run_func;
183 GstElementPostRunFunction post_run_func;
184 GAsyncQueue *prop_value_queue;
185 GMutex *property_mutex;
190 struct _GstElementClass {
191 GstObjectClass parent_class;
193 /* the element details */
194 GstElementDetails details;
196 /* factory that the element was created from */
197 GstElementFactory *elementfactory;
199 /* templates for our pads */
201 gint numpadtemplates;
203 /* signal callbacks */
204 void (*state_change) (GstElement *element, GstElementState old, GstElementState state);
205 void (*new_pad) (GstElement *element, GstPad *pad);
206 void (*pad_removed) (GstElement *element, GstPad *pad);
207 void (*error) (GstElement *element, GstElement *source, gchar *error);
208 void (*eos) (GstElement *element);
209 void (*found_tag) (GstElement *element, GstElement *source, GstTagList *tag_list);
211 /* local pointers for get/set */
212 void (*set_property) (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
213 void (*get_property) (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
216 gboolean (*release_locks) (GstElement *element);
218 /* query/convert/events functions */
219 const GstEventMask* (*get_event_masks) (GstElement *element);
220 gboolean (*send_event) (GstElement *element, GstEvent *event);
221 const GstFormat* (*get_formats) (GstElement *element);
222 gboolean (*convert) (GstElement *element,
223 GstFormat src_format, gint64 src_value,
224 GstFormat *dest_format, gint64 *dest_value);
225 const GstQueryType* (*get_query_types) (GstElement *element);
226 gboolean (*query) (GstElement *element, GstQueryType type,
227 GstFormat *format, gint64 *value);
229 /* change the element state */
230 GstElementStateReturn (*change_state) (GstElement *element);
232 /* request/release pads */
233 GstPad* (*request_new_pad) (GstElement *element, GstPadTemplate *templ, const gchar* name);
234 void (*release_pad) (GstElement *element, GstPad *pad);
237 GstClock* (*get_clock) (GstElement *element);
238 void (*set_clock) (GstElement *element, GstClock *clock);
241 GstIndex* (*get_index) (GstElement *element);
242 void (*set_index) (GstElement *element, GstIndex *index);
247 void gst_element_class_add_pad_template (GstElementClass *klass, GstPadTemplate *templ);
248 void gst_element_class_install_std_props (GstElementClass *klass,
249 const gchar *first_name, ...);
250 void gst_element_class_set_details (GstElementClass *klass,
251 GstElementDetails *details);
253 #define gst_element_default_deep_notify gst_object_default_deep_notify
255 void gst_element_default_error (GObject *object, GstObject *orig, gchar *error);
257 GType gst_element_get_type (void);
258 void gst_element_set_loop_function (GstElement *element,
259 GstElementLoopFunction loop);
261 #define gst_element_get_name(elem) gst_object_get_name(GST_OBJECT(elem))
262 #define gst_element_set_name(elem,name) gst_object_set_name(GST_OBJECT(elem),name)
263 #define gst_element_get_parent(elem) gst_object_get_parent(GST_OBJECT(elem))
264 #define gst_element_set_parent(elem,parent) gst_object_set_parent(GST_OBJECT(elem),parent)
266 /* threadsafe versions of their g_object_* counterparts */
267 void gst_element_set (GstElement *element, const gchar *first_property_name, ...);
268 void gst_element_get (GstElement *element, const gchar *first_property_name, ...);
269 void gst_element_set_valist (GstElement *element, const gchar *first_property_name,
271 void gst_element_get_valist (GstElement *element, const gchar *first_property_name,
273 void gst_element_set_property (GstElement *element, const gchar *property_name,
274 const GValue *value);
275 void gst_element_get_property (GstElement *element, const gchar *property_name,
278 void gst_element_enable_threadsafe_properties (GstElement *element);
279 void gst_element_disable_threadsafe_properties (GstElement *element);
280 void gst_element_set_pending_properties (GstElement *element);
283 gboolean gst_element_requires_clock (GstElement *element);
284 gboolean gst_element_provides_clock (GstElement *element);
285 GstClock* gst_element_get_clock (GstElement *element);
286 void gst_element_set_clock (GstElement *element, GstClock *clock);
287 GstClockReturn gst_element_clock_wait (GstElement *element,
288 GstClockID id, GstClockTimeDiff *jitter);
291 gboolean gst_element_is_indexable (GstElement *element);
292 void gst_element_set_index (GstElement *element, GstIndex *index);
293 GstIndex* gst_element_get_index (GstElement *element);
296 gboolean gst_element_release_locks (GstElement *element);
298 void gst_element_yield (GstElement *element);
299 gboolean gst_element_interrupt (GstElement *element);
300 void gst_element_set_scheduler (GstElement *element, GstScheduler *sched);
301 GstScheduler* gst_element_get_scheduler (GstElement *element);
303 void gst_element_add_pad (GstElement *element, GstPad *pad);
304 void gst_element_remove_pad (GstElement *element, GstPad *pad);
305 GstPad * gst_element_add_ghost_pad (GstElement *element, GstPad *pad, const gchar *name);
306 void gst_element_remove_ghost_pad (GstElement *element, GstPad *pad);
308 GstPad* gst_element_get_pad (GstElement *element, const gchar *name);
309 GstPad* gst_element_get_static_pad (GstElement *element, const gchar *name);
310 GstPad* gst_element_get_request_pad (GstElement *element, const gchar *name);
311 void gst_element_release_request_pad (GstElement *element, GstPad *pad);
313 G_CONST_RETURN GList*
314 gst_element_get_pad_list (GstElement *element);
315 GstPad* gst_element_get_compatible_pad (GstElement *element, GstPad *pad);
316 GstPad* gst_element_get_compatible_pad_filtered (GstElement *element, GstPad *pad,
317 GstCaps *filtercaps);
319 GstPadTemplate* gst_element_class_get_pad_template (GstElementClass *element_class, const gchar *name);
320 GList* gst_element_class_get_pad_template_list (GstElementClass *element_class);
321 GstPadTemplate* gst_element_get_pad_template (GstElement *element, const gchar *name);
322 GList* gst_element_get_pad_template_list (GstElement *element);
323 GstPadTemplate* gst_element_get_compatible_pad_template (GstElement *element, GstPadTemplate *compattempl);
325 gboolean gst_element_link (GstElement *src, GstElement *dest);
326 gboolean gst_element_link_many (GstElement *element_1,
327 GstElement *element_2, ...);
328 gboolean gst_element_link_filtered (GstElement *src, GstElement *dest,
329 GstCaps *filtercaps);
330 void gst_element_unlink (GstElement *src, GstElement *dest);
331 void gst_element_unlink_many (GstElement *element_1,
332 GstElement *element_2, ...);
334 gboolean gst_element_link_pads (GstElement *src, const gchar *srcpadname,
335 GstElement *dest, const gchar *destpadname);
336 gboolean gst_element_link_pads_filtered (GstElement *src, const gchar *srcpadname,
337 GstElement *dest, const gchar *destpadname,
338 GstCaps *filtercaps);
339 void gst_element_unlink_pads (GstElement *src, const gchar *srcpadname,
340 GstElement *dest, const gchar *destpadname);
342 G_CONST_RETURN GstEventMask*
343 gst_element_get_event_masks (GstElement *element);
344 gboolean gst_element_send_event (GstElement *element, GstEvent *event);
345 gboolean gst_element_seek (GstElement *element, GstSeekType seek_type,
347 G_CONST_RETURN GstQueryType*
348 gst_element_get_query_types (GstElement *element);
349 gboolean gst_element_query (GstElement *element, GstQueryType type,
350 GstFormat *format, gint64 *value);
351 G_CONST_RETURN GstFormat*
352 gst_element_get_formats (GstElement *element);
353 gboolean gst_element_convert (GstElement *element,
354 GstFormat src_format, gint64 src_value,
355 GstFormat *dest_format, gint64 *dest_value);
357 void gst_element_found_tags (GstElement *element, GstTagList *tag_list);
358 void gst_element_found_tags_for_pad (GstElement *element, GstPad *pad, GstClockTime timestamp,
361 void gst_element_set_eos (GstElement *element);
363 void gst_element_error (GstElement *element, const gchar *error, ...);
365 gboolean gst_element_is_locked_state (GstElement *element);
366 void gst_element_set_locked_state (GstElement *element, gboolean locked_state);
367 gboolean gst_element_sync_state_with_parent (GstElement *element);
369 GstElementState gst_element_get_state (GstElement *element);
370 GstElementStateReturn gst_element_set_state (GstElement *element, GstElementState state);
372 void gst_element_wait_state_change (GstElement *element);
374 G_CONST_RETURN gchar* gst_element_state_get_name (GstElementState state);
376 GstElementFactory* gst_element_get_factory (GstElement *element);
378 GstBin* gst_element_get_managing_bin (GstElement *element);
387 #define GST_TYPE_ELEMENT_FACTORY (gst_element_factory_get_type())
388 #define GST_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ELEMENT_FACTORY,\
390 #define GST_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ELEMENT_FACTORY,\
391 GstElementFactoryClass))
392 #define GST_IS_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ELEMENT_FACTORY))
393 #define GST_IS_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ELEMENT_FACTORY))
395 struct _GstElementFactory {
396 GstPluginFeature parent;
398 GType type; /* unique GType of element or 0 if not loaded */
400 GstElementDetails details;
402 GList * padtemplates;
403 guint numpadtemplates;
405 /* URI interface stuff */
407 gchar ** uri_protocols;
409 GList * interfaces; /* interfaces this element implements */
414 struct _GstElementFactoryClass {
415 GstPluginFeatureClass parent_class;
420 GType gst_element_factory_get_type (void);
422 gboolean gst_element_register (GstPlugin *plugin,
423 const gchar *elementname,
427 GstElementFactory * gst_element_factory_find (const gchar *name);
428 GType gst_element_factory_get_element_type (GstElementFactory *factory);
429 G_CONST_RETURN gchar * gst_element_factory_get_longname (GstElementFactory *factory);
430 G_CONST_RETURN gchar * gst_element_factory_get_klass (GstElementFactory *factory);
431 G_CONST_RETURN gchar * gst_element_factory_get_description (GstElementFactory *factory);
432 G_CONST_RETURN gchar * gst_element_factory_get_version (GstElementFactory *factory);
433 G_CONST_RETURN gchar * gst_element_factory_get_author (GstElementFactory *factory);
434 guint gst_element_factory_get_num_padtemplates (GstElementFactory *factory);
435 G_CONST_RETURN GList * gst_element_factory_get_padtemplates (GstElementFactory *factory);
436 guint gst_element_factory_get_uri_type (GstElementFactory *factory);
437 gchar ** gst_element_factory_get_uri_protocols (GstElementFactory *factory);
439 GstElement* gst_element_factory_create (GstElementFactory *factory,
441 GstElement* gst_element_factory_make (const gchar *factoryname, const gchar *name);
443 gboolean gst_element_factory_can_src_caps (GstElementFactory *factory,
445 gboolean gst_element_factory_can_sink_caps (GstElementFactory *factory,
448 void __gst_element_factory_add_pad_template (GstElementFactory *elementfactory,
449 GstPadTemplate *templ);
450 void __gst_element_factory_add_interface (GstElementFactory *elementfactory,
451 const gchar *interfacename);
457 #endif /* __GST_ELEMENT_H__ */