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/gstpluginfeature.h>
33 #include <gst/gstindex.h>
37 #define GST_NUM_STATES 4
39 /* NOTE: this probably should be done with an #ifdef to decide
40 * whether to safe-cast or to just do the non-checking cast.
42 #define GST_STATE(obj) (GST_ELEMENT(obj)->current_state)
43 #define GST_STATE_PENDING(obj) (GST_ELEMENT(obj)->pending_state)
45 /* Note: using 8 bit shift mostly "just because", it leaves us enough room to grow <g> */
46 #define GST_STATE_TRANSITION(obj) ((GST_STATE(obj)<<8) | GST_STATE_PENDING(obj))
47 #define GST_STATE_NULL_TO_READY ((GST_STATE_NULL<<8) | GST_STATE_READY)
48 #define GST_STATE_READY_TO_PAUSED ((GST_STATE_READY<<8) | GST_STATE_PAUSED)
49 #define GST_STATE_PAUSED_TO_PLAYING ((GST_STATE_PAUSED<<8) | GST_STATE_PLAYING)
50 #define GST_STATE_PLAYING_TO_PAUSED ((GST_STATE_PLAYING<<8) | GST_STATE_PAUSED)
51 #define GST_STATE_PAUSED_TO_READY ((GST_STATE_PAUSED<<8) | GST_STATE_READY)
52 #define GST_STATE_READY_TO_NULL ((GST_STATE_READY<<8) | GST_STATE_NULL)
54 extern GType _gst_element_type;
56 #define GST_TYPE_ELEMENT (_gst_element_type)
58 #define GST_ELEMENT_CAST(obj) ((GstElement*)(obj))
59 #define GST_ELEMENT_CLASS_CAST(klass) ((GstElementClass*)(klass))
60 #define GST_IS_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_ELEMENT))
61 #define GST_IS_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_ELEMENT))
62 #define GST_ELEMENT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_ELEMENT, GstElementClass))
64 #ifdef GST_TYPE_PARANOID
65 # define GST_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_ELEMENT, GstElement))
66 # define GST_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_ELEMENT, GstElementClass))
68 # define GST_ELEMENT GST_ELEMENT_CAST
69 # define GST_ELEMENT_CLASS GST_ELEMENT_CLASS_CAST
72 /* convenience functions */
73 #ifdef G_HAVE_ISO_VARARGS
74 #define GST_ELEMENT_QUERY_TYPE_FUNCTION(functionname, ...) \
75 GST_QUERY_TYPE_FUNCTION (GstElement*, functionname, __VA_ARGS__);
76 #define GST_ELEMENT_FORMATS_FUNCTION(functionname, ...) \
77 GST_FORMATS_FUNCTION (GstElement*, functionname, __VA_ARGS__);
78 #define GST_ELEMENT_EVENT_MASK_FUNCTION(functionname, ...) \
79 GST_EVENT_MASK_FUNCTION (GstElement*, functionname, __VA_ARGS__);
80 #elif defined(G_HAVE_GNUC_VARARGS)
81 #define GST_ELEMENT_QUERY_TYPE_FUNCTION(functionname, a...) \
82 GST_QUERY_TYPE_FUNCTION (GstElement*, functionname, a);
83 #define GST_ELEMENT_FORMATS_FUNCTION(functionname, a...) \
84 GST_FORMATS_FUNCTION (GstElement*, functionname, a);
85 #define GST_ELEMENT_EVENT_MASK_FUNCTION(functionname, a...) \
86 GST_EVENT_MASK_FUNCTION (GstElement*, functionname, a);
90 /* element is complex (for some def.) and generally require a cothread */
91 GST_ELEMENT_COMPLEX = GST_OBJECT_FLAG_LAST,
92 /* input and output pads aren't directly coupled to each other
93 examples: queues, multi-output async readers, etc. */
94 GST_ELEMENT_DECOUPLED,
95 /* this element should be placed in a thread if at all possible */
96 GST_ELEMENT_THREAD_SUGGESTED,
97 /* this element, for some reason, has a loop function that performs
98 * an infinite loop without calls to gst_element_yield () */
99 GST_ELEMENT_INFINITE_LOOP,
100 /* there is a new loopfunction ready for placement */
101 GST_ELEMENT_NEW_LOOPFUNC,
102 /* if this element can handle events */
103 GST_ELEMENT_EVENT_AWARE,
104 /* use threadsafe property get/set implementation */
105 GST_ELEMENT_USE_THREADSAFE_PROPERTIES,
107 /* private flags that can be used by the scheduler */
108 GST_ELEMENT_SCHEDULER_PRIVATE1,
109 GST_ELEMENT_SCHEDULER_PRIVATE2,
111 /* use some padding for future expansion */
112 GST_ELEMENT_FLAG_LAST = GST_OBJECT_FLAG_LAST + 16
115 #define GST_ELEMENT_IS_THREAD_SUGGESTED(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_THREAD_SUGGESTED))
116 #define GST_ELEMENT_IS_EOS(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_EOS))
117 #define GST_ELEMENT_IS_EVENT_AWARE(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_EVENT_AWARE))
118 #define GST_ELEMENT_IS_DECOUPLED(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_DECOUPLED))
120 #define GST_ELEMENT_NAME(obj) (GST_OBJECT_NAME(obj))
121 #define GST_ELEMENT_PARENT(obj) (GST_OBJECT_PARENT(obj))
122 #define GST_ELEMENT_MANAGER(obj) (((GstElement*)(obj))->manager)
123 #define GST_ELEMENT_SCHED(obj) (((GstElement*)(obj))->sched)
124 #define GST_ELEMENT_CLOCK(obj) (((GstElement*)(obj))->clock)
125 #define GST_ELEMENT_PADS(obj) ((obj)->pads)
127 typedef struct _GstElementFactory GstElementFactory;
128 typedef struct _GstElementFactoryClass GstElementFactoryClass;
130 typedef void (*GstElementLoopFunction) (GstElement *element);
131 typedef void (*GstElementPreRunFunction) (GstElement *element);
132 typedef void (*GstElementPostRunFunction) (GstElement *element);
137 /* element state and scheduling */
138 guint8 current_state;
139 guint8 pending_state;
140 GstElementLoopFunction loopfunc;
143 gpointer sched_private;
145 /* allocated clock */
147 GstClockTime base_time;
158 GstElementPreRunFunction pre_run_func;
159 GstElementPostRunFunction post_run_func;
160 GAsyncQueue *prop_value_queue;
161 GMutex *property_mutex;
166 struct _GstElementClass {
167 GstObjectClass parent_class;
169 /* the elementfactory that created us */
170 GstElementFactory *elementfactory;
171 /* templates for our pads */
173 gint numpadtemplates;
175 /* signal callbacks */
176 void (*state_change) (GstElement *element, GstElementState old, GstElementState state);
177 void (*new_pad) (GstElement *element, GstPad *pad);
178 void (*pad_removed) (GstElement *element, GstPad *pad);
179 void (*error) (GstElement *element, GstElement *source, gchar *error);
180 void (*eos) (GstElement *element);
182 /* local pointers for get/set */
183 void (*set_property) (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
184 void (*get_property) (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
187 gboolean (*release_locks) (GstElement *element);
189 /* query/convert/events functions */
190 const GstEventMask* (*get_event_masks) (GstElement *element);
191 gboolean (*send_event) (GstElement *element, GstEvent *event);
192 const GstFormat* (*get_formats) (GstElement *element);
193 gboolean (*convert) (GstElement *element,
194 GstFormat src_format, gint64 src_value,
195 GstFormat *dest_format, gint64 *dest_value);
196 const GstQueryType* (*get_query_types) (GstElement *element);
197 gboolean (*query) (GstElement *element, GstQueryType type,
198 GstFormat *format, gint64 *value);
200 /* change the element state */
201 GstElementStateReturn (*change_state) (GstElement *element);
203 /* request/release pads */
204 GstPad* (*request_new_pad) (GstElement *element, GstPadTemplate *templ, const gchar* name);
205 void (*release_pad) (GstElement *element, GstPad *pad);
208 GstClock* (*get_clock) (GstElement *element);
209 void (*set_clock) (GstElement *element, GstClock *clock);
212 GstIndex* (*get_index) (GstElement *element);
213 void (*set_index) (GstElement *element, GstIndex *index);
219 void gst_element_class_add_pad_template (GstElementClass *klass, GstPadTemplate *templ);
220 void gst_element_class_install_std_props (GstElementClass *klass,
221 const gchar *first_name, ...);
223 #define gst_element_default_deep_notify gst_object_default_deep_notify
225 void gst_element_default_error (GObject *object, GstObject *orig, gchar *error);
227 GType gst_element_get_type (void);
228 #define gst_element_destroy(element) gst_object_destroy (GST_OBJECT (element))
230 void gst_element_set_loop_function (GstElement *element,
231 GstElementLoopFunction loop);
233 #define gst_element_get_name(elem) gst_object_get_name(GST_OBJECT(elem))
234 #define gst_element_set_name(elem,name) gst_object_set_name(GST_OBJECT(elem),name)
235 #define gst_element_get_parent(elem) gst_object_get_parent(GST_OBJECT(elem))
236 #define gst_element_set_parent(elem,parent) gst_object_set_parent(GST_OBJECT(elem),parent)
238 /* threadsafe versions of their g_object_* counterparts */
239 void gst_element_set (GstElement *element, const gchar *first_property_name, ...);
240 void gst_element_get (GstElement *element, const gchar *first_property_name, ...);
241 void gst_element_set_valist (GstElement *element, const gchar *first_property_name,
243 void gst_element_get_valist (GstElement *element, const gchar *first_property_name,
245 void gst_element_set_property (GstElement *element, const gchar *property_name,
246 const GValue *value);
247 void gst_element_get_property (GstElement *element, const gchar *property_name,
250 void gst_element_enable_threadsafe_properties (GstElement *element);
251 void gst_element_disable_threadsafe_properties (GstElement *element);
252 void gst_element_set_pending_properties (GstElement *element);
255 gboolean gst_element_requires_clock (GstElement *element);
256 gboolean gst_element_provides_clock (GstElement *element);
257 GstClock* gst_element_get_clock (GstElement *element);
258 void gst_element_set_clock (GstElement *element, GstClock *clock);
259 GstClockReturn gst_element_clock_wait (GstElement *element,
260 GstClockID id, GstClockTimeDiff *jitter);
262 gboolean gst_element_is_indexable (GstElement *element);
263 void gst_element_set_index (GstElement *element, GstIndex *index);
264 GstIndex* gst_element_get_index (GstElement *element);
267 gboolean gst_element_release_locks (GstElement *element);
269 void gst_element_yield (GstElement *element);
270 gboolean gst_element_interrupt (GstElement *element);
271 void gst_element_set_scheduler (GstElement *element, GstScheduler *sched);
272 GstScheduler* gst_element_get_scheduler (GstElement *element);
274 void gst_element_add_pad (GstElement *element, GstPad *pad);
275 void gst_element_remove_pad (GstElement *element, GstPad *pad);
276 GstPad * gst_element_add_ghost_pad (GstElement *element, GstPad *pad, const gchar *name);
277 void gst_element_remove_ghost_pad (GstElement *element, GstPad *pad);
279 GstPad* gst_element_get_pad (GstElement *element, const gchar *name);
280 GstPad* gst_element_get_static_pad (GstElement *element, const gchar *name);
281 GstPad* gst_element_get_request_pad (GstElement *element, const gchar *name);
282 void gst_element_release_request_pad (GstElement *element, GstPad *pad);
284 const GList* gst_element_get_pad_list (GstElement *element);
285 GstPad* gst_element_get_compatible_pad (GstElement *element, GstPad *pad);
286 GstPad* gst_element_get_compatible_pad_filtered (GstElement *element, GstPad *pad,
287 GstCaps *filtercaps);
289 GstPadTemplate* gst_element_get_pad_template (GstElement *element, const gchar *name);
290 GList* gst_element_get_pad_template_list (GstElement *element);
291 GstPadTemplate* gst_element_get_compatible_pad_template (GstElement *element, GstPadTemplate *compattempl);
293 gboolean gst_element_link (GstElement *src, GstElement *dest);
294 gboolean gst_element_link_many (GstElement *element_1, GstElement *element_2, ...);
295 gboolean gst_element_link_filtered (GstElement *src, GstElement *dest,
296 GstCaps *filtercaps);
297 void gst_element_unlink (GstElement *src, GstElement *dest);
298 void gst_element_unlink_many (GstElement *element_1, GstElement *element_2, ...);
300 gboolean gst_element_link_pads (GstElement *src, const gchar *srcpadname,
301 GstElement *dest, const gchar *destpadname);
302 gboolean gst_element_link_pads_filtered (GstElement *src, const gchar *srcpadname,
303 GstElement *dest, const gchar *destpadname,
304 GstCaps *filtercaps);
305 void gst_element_unlink_pads (GstElement *src, const gchar *srcpadname,
306 GstElement *dest, const gchar *destpadname);
308 const GstEventMask* gst_element_get_event_masks (GstElement *element);
309 gboolean gst_element_send_event (GstElement *element, GstEvent *event);
310 const GstQueryType* gst_element_get_query_types (GstElement *element);
311 gboolean gst_element_query (GstElement *element, GstQueryType type,
312 GstFormat *format, gint64 *value);
313 const GstFormat* gst_element_get_formats (GstElement *element);
314 gboolean gst_element_convert (GstElement *element,
315 GstFormat src_format, gint64 src_value,
316 GstFormat *dest_format, gint64 *dest_value);
318 void gst_element_set_eos (GstElement *element);
320 void gst_element_error (GstElement *element, const gchar *error, ...);
322 GstElementState gst_element_get_state (GstElement *element);
323 GstElementStateReturn gst_element_set_state (GstElement *element, GstElementState state);
325 void gst_element_wait_state_change (GstElement *element);
327 const gchar* gst_element_state_get_name (GstElementState state);
329 GstElementFactory* gst_element_get_factory (GstElement *element);
331 GstBin* gst_element_get_managing_bin (GstElement *element);
339 typedef struct _GstElementDetails GstElementDetails;
341 struct _GstElementDetails {
342 gchar *longname; /* long, english name */
343 gchar *klass; /* type of element, as hierarchy */
344 gchar *license; /* license element is under */
345 gchar *description; /* insights of one form or another */
346 gchar *version; /* version of the element */
347 gchar *author; /* who wrote this thing? */
348 gchar *copyright; /* copyright details (year, etc.) */
351 #define GST_TYPE_ELEMENT_FACTORY (gst_element_factory_get_type())
352 #define GST_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ELEMENT_FACTORY,\
354 #define GST_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ELEMENT_FACTORY,\
355 GstElementFactoryClass))
356 #define GST_IS_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ELEMENT_FACTORY))
357 #define GST_IS_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ELEMENT_FACTORY))
359 #define GST_ELEMENT_RANK_PRIMARY 256
360 #define GST_ELEMENT_RANK_SECONDARY 128
361 #define GST_ELEMENT_RANK_MARGINAL 64
362 #define GST_ELEMENT_RANK_NONE 0
364 struct _GstElementFactory {
365 GstPluginFeature feature;
367 GType type; /* unique GType of element */
369 guint details_dynamic : 1;
371 GstElementDetails *details; /* pointer to details struct */
374 guint16 numpadtemplates;
376 guint16 rank; /* used by autoplug to prioritise elements to try */
379 struct _GstElementFactoryClass {
380 GstPluginFeatureClass parent_class;
383 GType gst_element_factory_get_type (void);
385 GstElementFactory* gst_element_factory_new (const gchar *name, GType type,
386 GstElementDetails *details);
387 GstElementFactory* gst_element_factory_find (const gchar *name);
389 void gst_element_factory_add_pad_template (GstElementFactory *elementfactory,
390 GstPadTemplate *templ);
392 gboolean gst_element_factory_can_src_caps (GstElementFactory *factory,
394 gboolean gst_element_factory_can_sink_caps (GstElementFactory *factory,
397 GstElement* gst_element_factory_create (GstElementFactory *factory,
399 GstElement* gst_element_factory_make (const gchar *factoryname, const gchar *name);
400 GstElement* gst_element_factory_make_or_warn (const gchar *factoryname, const gchar *name);
402 void gst_element_factory_set_rank (GstElementFactory *factory, guint16 rank);
407 #endif /* __GST_ELEMENT_H__ */