2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000,2004 Wim Taymans <wim@fluendo.com>
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 /* gstelement.h and gstelementfactory.h include eachother */
28 typedef struct _GstElement GstElement;
29 typedef struct _GstElementClass GstElementClass;
31 /* gstmessage.h needs State */
34 * @GST_STATE_VOID_PENDING: no pending state.
35 * @GST_STATE_NULL : the NULL state or initial state of an element.
36 * @GST_STATE_READY : the element is ready to go to PAUSED.
37 * @GST_STATE_PAUSED : the element is PAUSED, it is ready to accept and
38 * process data. Sink elements however only accept one
39 * buffer and then block.
40 * @GST_STATE_PLAYING : the element is PLAYING, the #GstClock is running and
41 * the data is flowing.
43 * The possible states an element can be in. States can be changed using
44 * gst_element_set_state() and checked using gst_element_get_state().
47 GST_STATE_VOID_PENDING = 0,
55 #include <gst/gstconfig.h>
56 #include <gst/gstobject.h>
57 #include <gst/gstpad.h>
58 #include <gst/gstbus.h>
59 #include <gst/gstclock.h>
60 #include <gst/gstelementfactory.h>
61 #include <gst/gstplugin.h>
62 #include <gst/gstpluginfeature.h>
63 #include <gst/gstindex.h>
64 #include <gst/gstindexfactory.h>
65 #include <gst/gstiterator.h>
66 #include <gst/gstmessage.h>
67 #include <gst/gsttaglist.h>
71 #define GST_TYPE_ELEMENT (gst_element_get_type ())
72 #define GST_IS_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_ELEMENT))
73 #define GST_IS_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_ELEMENT))
74 #define GST_ELEMENT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_ELEMENT, GstElementClass))
75 #define GST_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_ELEMENT, GstElement))
76 #define GST_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_ELEMENT, GstElementClass))
77 #define GST_ELEMENT_CAST(obj) ((GstElement*)(obj))
80 * GstStateChangeReturn:
81 * @GST_STATE_CHANGE_FAILURE : the state change failed
82 * @GST_STATE_CHANGE_SUCCESS : the state change succeeded
83 * @GST_STATE_CHANGE_ASYNC : the state change will happen asynchronously
84 * @GST_STATE_CHANGE_NO_PREROLL: the state change succeeded but the element
85 * cannot produce data in %GST_STATE_PAUSED.
86 * This typically happens with live sources.
88 * The possible return values from a state change function. Only
89 * @GST_STATE_CHANGE_FAILURE is a real failure.
92 GST_STATE_CHANGE_FAILURE = 0,
93 GST_STATE_CHANGE_SUCCESS = 1,
94 GST_STATE_CHANGE_ASYNC = 2,
95 GST_STATE_CHANGE_NO_PREROLL = 3
96 } GstStateChangeReturn;
98 /* NOTE: this probably should be done with an #ifdef to decide
99 * whether to safe-cast or to just do the non-checking cast.
104 * @elem: a #GstElement to return state for.
106 * This macro returns the current #GstState of the element.
108 #define GST_STATE(elem) (GST_ELEMENT_CAST(elem)->current_state)
112 * @elem: a #GstElement to return the next state for.
114 * This macro returns the next #GstState of the element.
116 #define GST_STATE_NEXT(elem) (GST_ELEMENT_CAST(elem)->next_state)
120 * @elem: a #GstElement to return the pending state for.
122 * This macro returns the currently pending #GstState of the element.
124 #define GST_STATE_PENDING(elem) (GST_ELEMENT_CAST(elem)->pending_state)
128 * @elem: a #GstElement to return the target state for.
130 * This macro returns the target #GstState of the element.
134 #define GST_STATE_TARGET(elem) (GST_ELEMENT_CAST(elem)->abidata.ABI.target_state)
138 * @elem: a #GstElement to return the last state result for.
140 * This macro returns the last #GstStateChangeReturn value.
142 #define GST_STATE_RETURN(elem) (GST_ELEMENT_CAST(elem)->last_return)
144 #define __GST_SIGN(val) ((val) < 0 ? -1 : ((val) > 0 ? 1 : 0))
146 * GST_STATE_GET_NEXT:
147 * @cur: A starting #GstState
148 * @pending: A target #GstState
150 * Given a current state @cur and a target state @pending, calculate the next (intermediate)
153 #define GST_STATE_GET_NEXT(cur,pending) ((cur) + __GST_SIGN ((gint)(pending) - (gint)(cur)))
155 * GST_STATE_TRANSITION:
156 * @cur: A current state
157 * @next: A next state
159 * Given a current state @cur and a next state @next, calculate the associated
160 * #GstStateChange transition.
162 #define GST_STATE_TRANSITION(cur,next) ((GstStateChange)(((cur)<<3)|(next)))
164 * GST_STATE_TRANSITION_CURRENT:
165 * @trans: A #GstStateChange
167 * Given a state transition @trans, extract the current #GstState.
169 #define GST_STATE_TRANSITION_CURRENT(trans) ((GstState)((trans)>>3))
171 * GST_STATE_TRANSITION_NEXT:
172 * @trans: A #GstStateChange
174 * Given a state transition @trans, extract the next #GstState.
176 #define GST_STATE_TRANSITION_NEXT(trans) ((GstState)((trans)&0x7))
180 * @GST_STATE_CHANGE_NULL_TO_READY : state change from NULL to READY.
183 * The element must check if the resources it needs are available. Device
184 * sinks and -sources typically try to probe the device to constrain their
188 * The element opens the device (in case feature need to be probed).
191 * @GST_STATE_CHANGE_READY_TO_PAUSED : state change from READY to PAUSED.
194 * The element pads are activated in order to receive data in PAUSED.
195 * Streaming threads are started.
198 * Some elements might need to return ASYNC and complete the state change
199 * when they have enough information. It is a requirement for sinks to
200 * return ASYNC and complete the state change when they receive the first
201 * buffer or EOS event (preroll). Sinks also block the dataflow when in
205 * A pipeline resets the running_time to 0.
208 * Live sources return NO_PREROLL and don't generate data.
211 * @GST_STATE_CHANGE_PAUSED_TO_PLAYING: state change from PAUSED to PLAYING.
214 * Most elements ignore this state change.
217 * The pipeline selects a clock and distributes this to all the children
218 * before setting them to PLAYING. This means that it is only alowed to
219 * synchronize on the clock in the PLAYING state.
222 * The pipeline uses the clock and the running_time to calculate the
223 * base_time. The base_time is distributed to all children when performing
227 * Sink elements stop blocking on the preroll buffer or event and start
228 * rendering the data.
231 * Sinks can post the EOS message in the PLAYING state. It is not allowed to
232 * post EOS when not in the PLAYING state.
235 * While streaming in PAUSED or PLAYING elements can create and remove
239 * Live sources start generating data and return SUCCESS.
242 * @GST_STATE_CHANGE_PLAYING_TO_PAUSED: state change from PLAYING to PAUSED.
245 * Most elements ignore this state change.
248 * The pipeline calculates the running_time based on the last selected clock
249 * and the base_time. It stores this information to continue playback when
250 * going back to the PLAYING state.
253 * Sinks unblock any clock wait calls.
256 * When a sink does not have a pending buffer to play, it returns ASYNC from
257 * this state change and completes the state change when it receives a new
258 * buffer or an EOS event.
261 * Any queued EOS messages are removed since they will be reposted when going
262 * back to the PLAYING state. The EOS messages are queued in GstBins.
265 * Live sources stop generating data and return NO_PREROLL.
268 * @GST_STATE_CHANGE_PAUSED_TO_READY : state change from PAUSED to READY.
271 * Sinks unblock any waits in the preroll.
274 * Elements unblock any waits on devices
277 * Chain or get_range functions return WRONG_STATE.
280 * The element pads are deactivated so that streaming becomes impossible and
281 * all streaming threads are stopped.
284 * The sink forgets all negotiated formats
287 * Elements remove all sometimes pads
290 * @GST_STATE_CHANGE_READY_TO_NULL : state change from READY to NULL.
293 * Elements close devices
296 * Elements reset any internal state.
300 * These are the different state changes an element goes through.
301 * %GST_STATE_NULL ⇒ %GST_STATE_PLAYING is called an upwards state change
302 * and %GST_STATE_PLAYING ⇒ %GST_STATE_NULL a downwards state change.
304 typedef enum /*< flags=0 >*/
306 GST_STATE_CHANGE_NULL_TO_READY = (GST_STATE_NULL<<3) | GST_STATE_READY,
307 GST_STATE_CHANGE_READY_TO_PAUSED = (GST_STATE_READY<<3) | GST_STATE_PAUSED,
308 GST_STATE_CHANGE_PAUSED_TO_PLAYING = (GST_STATE_PAUSED<<3) | GST_STATE_PLAYING,
309 GST_STATE_CHANGE_PLAYING_TO_PAUSED = (GST_STATE_PLAYING<<3) | GST_STATE_PAUSED,
310 GST_STATE_CHANGE_PAUSED_TO_READY = (GST_STATE_PAUSED<<3) | GST_STATE_READY,
311 GST_STATE_CHANGE_READY_TO_NULL = (GST_STATE_READY<<3) | GST_STATE_NULL
316 * @GST_ELEMENT_LOCKED_STATE: ignore state changes from parent
317 * @GST_ELEMENT_IS_SINK: the element is a sink
318 * @GST_ELEMENT_UNPARENTING: Child is being removed from the parent bin.
319 * gst_bin_remove() on a child already being removed immediately returns FALSE
320 * @GST_ELEMENT_IS_SOURCE: the element is a source. Since 0.10.31
321 * @GST_ELEMENT_FLAG_LAST: offset to define more flags
323 * The standard flags that an element may have.
327 GST_ELEMENT_LOCKED_STATE = (GST_OBJECT_FLAG_LAST << 0),
328 GST_ELEMENT_IS_SINK = (GST_OBJECT_FLAG_LAST << 1),
329 GST_ELEMENT_UNPARENTING = (GST_OBJECT_FLAG_LAST << 2),
330 GST_ELEMENT_IS_SOURCE = (GST_OBJECT_FLAG_LAST << 3),
332 GST_ELEMENT_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 16)
336 * GST_ELEMENT_IS_LOCKED_STATE:
337 * @elem: A #GstElement to query
339 * Check if the element is in the locked state and therefore will ignore state
340 * changes from its parent object.
342 #define GST_ELEMENT_IS_LOCKED_STATE(elem) (GST_OBJECT_FLAG_IS_SET(elem,GST_ELEMENT_LOCKED_STATE))
346 * @elem: A #GstElement to query
348 * Gets the name of this element. Use only in core as this is not
349 * ABI-compatible. Others use gst_element_get_name()
351 #define GST_ELEMENT_NAME(elem) (GST_OBJECT_NAME(elem))
354 * GST_ELEMENT_PARENT:
355 * @elem: A #GstElement to query
357 * Get the parent object of this element.
359 #define GST_ELEMENT_PARENT(elem) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(elem)))
363 * @elem: A #GstElement to query
365 * Get the message bus of this element.
367 #define GST_ELEMENT_BUS(elem) (GST_ELEMENT_CAST(elem)->bus)
371 * @elem: A #GstElement to query
373 * Get the clock of this element
375 #define GST_ELEMENT_CLOCK(elem) (GST_ELEMENT_CAST(elem)->clock)
379 * @elem: A #GstElement to query
381 * Get the pads of this elements.
383 #define GST_ELEMENT_PADS(elem) (GST_ELEMENT_CAST(elem)->pads)
386 * GST_ELEMENT_START_TIME:
387 * @elem: a #GstElement to return the start time for.
389 * This macro returns the start_time of the @elem. The start_time is the
390 * running_time of the pipeline when the element went to PAUSED.
394 #define GST_ELEMENT_START_TIME(elem) (GST_ELEMENT_CAST(elem)->abidata.ABI.start_time)
398 * @el: the element that generates the error
399 * @domain: like CORE, LIBRARY, RESOURCE or STREAM (see #gstreamer-GstGError)
400 * @code: error code defined for that domain (see #gstreamer-GstGError)
401 * @text: the message to display (format string and args enclosed in
403 * @debug: debugging information for the message (format string and args
404 enclosed in parentheses)
406 * Utility function that elements can use in case they encountered a fatal
407 * data processing error. The pipeline will post an error message and the
408 * application will be requested to stop further media processing.
410 #define GST_ELEMENT_ERROR(el, domain, code, text, debug) \
412 gchar *__txt = _gst_element_error_printf text; \
413 gchar *__dbg = _gst_element_error_printf debug; \
415 GST_WARNING_OBJECT (el, "error: %s", __txt); \
417 GST_WARNING_OBJECT (el, "error: %s", __dbg); \
418 gst_element_message_full (GST_ELEMENT(el), GST_MESSAGE_ERROR, \
419 GST_ ## domain ## _ERROR, GST_ ## domain ## _ERROR_ ## code, \
420 __txt, __dbg, __FILE__, GST_FUNCTION, __LINE__); \
424 * GST_ELEMENT_WARNING:
425 * @el: the element that generates the warning
426 * @domain: like CORE, LIBRARY, RESOURCE or STREAM (see #gstreamer-GstGError)
427 * @code: error code defined for that domain (see #gstreamer-GstGError)
428 * @text: the message to display (format string and args enclosed in
430 * @debug: debugging information for the message (format string and args
431 enclosed in parentheses)
433 * Utility function that elements can use in case they encountered a non-fatal
434 * data processing problem. The pipeline will post a warning message and the
435 * application will be informed.
437 #define GST_ELEMENT_WARNING(el, domain, code, text, debug) \
439 gchar *__txt = _gst_element_error_printf text; \
440 gchar *__dbg = _gst_element_error_printf debug; \
442 GST_WARNING_OBJECT (el, "warning: %s", __txt); \
444 GST_WARNING_OBJECT (el, "warning: %s", __dbg); \
445 gst_element_message_full (GST_ELEMENT(el), GST_MESSAGE_WARNING, \
446 GST_ ## domain ## _ERROR, GST_ ## domain ## _ERROR_ ## code, \
447 __txt, __dbg, __FILE__, GST_FUNCTION, __LINE__); \
452 * @el: the element that generates the information
453 * @domain: like CORE, LIBRARY, RESOURCE or STREAM (see #gstreamer-GstGError)
454 * @code: error code defined for that domain (see #gstreamer-GstGError)
455 * @text: the message to display (format string and args enclosed in
457 * @debug: debugging information for the message (format string and args
458 enclosed in parentheses)
460 * Utility function that elements can use in case they want to inform
461 * the application of something noteworthy that is not an error.
462 * The pipeline will post a warning message and the
463 * application will be informed.
467 #define GST_ELEMENT_INFO(el, domain, code, text, debug) \
469 gchar *__txt = _gst_element_error_printf text; \
470 gchar *__dbg = _gst_element_error_printf debug; \
472 GST_INFO_OBJECT (el, "info: %s", __txt); \
474 GST_INFO_OBJECT (el, "info: %s", __dbg); \
475 gst_element_message_full (GST_ELEMENT(el), GST_MESSAGE_INFO, \
476 GST_ ## domain ## _ERROR, GST_ ## domain ## _ERROR_ ## code, \
477 __txt, __dbg, __FILE__, GST_FUNCTION, __LINE__); \
480 /* the state change mutexes and conds */
482 * GST_STATE_GET_LOCK:
483 * @elem: a #GstElement
485 * Get a reference to the state lock of @elem.
486 * This lock is used by the core. It is taken while getting or setting
487 * the state, during state changes, and while finalizing.
489 #define GST_STATE_GET_LOCK(elem) (GST_ELEMENT_CAST(elem)->state_lock)
491 * GST_STATE_GET_COND:
492 * @elem: a #GstElement
494 * Get the conditional used to signal the completion of a state change.
496 #define GST_STATE_GET_COND(elem) (GST_ELEMENT_CAST(elem)->state_cond)
498 #define GST_STATE_LOCK(elem) g_static_rec_mutex_lock(GST_STATE_GET_LOCK(elem))
499 #define GST_STATE_TRYLOCK(elem) g_static_rec_mutex_trylock(GST_STATE_GET_LOCK(elem))
500 #define GST_STATE_UNLOCK(elem) g_static_rec_mutex_unlock(GST_STATE_GET_LOCK(elem))
501 #define GST_STATE_UNLOCK_FULL(elem) g_static_rec_mutex_unlock_full(GST_STATE_GET_LOCK(elem))
502 #define GST_STATE_LOCK_FULL(elem,t) g_static_rec_mutex_lock_full(GST_STATE_GET_LOCK(elem), t)
503 #define GST_STATE_WAIT(elem) g_cond_wait (GST_STATE_GET_COND (elem), \
504 GST_OBJECT_GET_LOCK (elem))
505 #define GST_STATE_TIMED_WAIT(elem, timeval) g_cond_timed_wait (GST_STATE_GET_COND (elem), \
506 GST_OBJECT_GET_LOCK (elem), timeval)
507 #define GST_STATE_SIGNAL(elem) g_cond_signal (GST_STATE_GET_COND (elem));
508 #define GST_STATE_BROADCAST(elem) g_cond_broadcast (GST_STATE_GET_COND (elem));
512 * @state_lock: Used to serialize execution of gst_element_set_state()
513 * @state_cond: Used to signal completion of a state change
514 * @state_cookie: Used to detect concurrent execution of
515 * gst_element_set_state() and gst_element_get_state()
516 * @current_state: the current state of an element
517 * @next_state: the next state of an element, can be #GST_STATE_VOID_PENDING if
518 * the element is in the correct state.
519 * @pending_state: the final state the element should go to, can be
520 * #GST_STATE_VOID_PENDING if the element is in the correct state
521 * @last_return: the last return value of an element state change
522 * @bus: the bus of the element. This bus is provided to the element by the
523 * parent element or the application. A #GstPipeline has a bus of its own.
524 * @clock: the clock of the element. This clock is usually provided to the
525 * element by the toplevel #GstPipeline.
526 * @base_time: the time of the clock right before the element is set to
527 * PLAYING. Subtracting @base_time from the current clock time in the PLAYING
528 * state will yield the running_time against the clock.
529 * @numpads: number of pads of the element, includes both source and sink pads.
530 * @pads: list of pads
531 * @numsrcpads: number of source pads of the element.
532 * @srcpads: list of source pads
533 * @numsinkpads: number of sink pads of the element.
534 * @sinkpads: list of sink pads
535 * @pads_cookie: updated whenever the a pad is added or removed
537 * GStreamer element abstract base class.
543 /*< public >*/ /* with LOCK */
544 GStaticRecMutex *state_lock;
548 guint32 state_cookie;
549 GstState current_state;
551 GstState pending_state;
552 GstStateChangeReturn last_return;
556 /* allocated clock */
558 GstClockTimeDiff base_time; /* NULL/READY: 0 - PAUSED: current time - PLAYING: difference to clock */
560 /* element pads, these lists can only be iterated while holding
561 * the LOCK or checking the cookie after each LOCK. */
573 /* state set by application */
574 GstState target_state;
575 /* running time of the last PAUSED state */
576 GstClockTime start_time;
578 /* adding + 0 to mark ABI change to be undone later */
579 gpointer _gst_reserved[GST_PADDING + 0];
585 * @parent_class: the parent class structure
586 * @details: #GstElementDetails for elements of this class
587 * @elementfactory: the #GstElementFactory that creates these elements
588 * @padtemplates: a #GList of #GstPadTemplate
589 * @numpadtemplates: the number of padtemplates
590 * @pad_templ_cookie: changed whenever the padtemplates change
591 * @request_new_pad: called when a new pad is requested
592 * @release_pad: called when a request pad is to be released
593 * @get_state: get the state of the element
594 * @set_state: set a new state on the element
595 * @change_state: called by @set_state to perform an incremental state change
596 * @set_bus: set a #GstBus on the element
597 * @provide_clock: gets the #GstClock provided by the element
598 * @set_clock: set the #GstClock on the element
599 * @get_index: set a #GstIndex on the element
600 * @set_index: get the #GstIndex of an element
601 * @send_event: send a #GstEvent to the element
602 * @get_query_types: get the supported #GstQueryType of this element
603 * @query: perform a #GstQuery on the element
604 * @request_new_pad_full: called when a new pad is requested. Since: 0.10.32.
606 * GStreamer element class. Override the vmethods to implement the element
609 struct _GstElementClass
611 GstObjectClass parent_class;
614 /* the element details */
615 /* FIXME-0.11: deprecate this in favour of meta_data */
616 GstElementDetails details;
618 /* factory that the element was created from */
619 GstElementFactory *elementfactory;
621 /* templates for our pads */
623 gint numpadtemplates;
624 guint32 pad_templ_cookie;
627 /* signal callbacks */
628 void (*pad_added) (GstElement *element, GstPad *pad);
629 void (*pad_removed) (GstElement *element, GstPad *pad);
630 void (*no_more_pads) (GstElement *element);
633 /* virtual methods for subclasses */
635 /* request/release pads */
636 GstPad* (*request_new_pad) (GstElement *element, GstPadTemplate *templ, const gchar* name);
637 void (*release_pad) (GstElement *element, GstPad *pad);
640 GstStateChangeReturn (*get_state) (GstElement * element, GstState * state,
641 GstState * pending, GstClockTime timeout);
642 GstStateChangeReturn (*set_state) (GstElement *element, GstState state);
643 GstStateChangeReturn (*change_state) (GstElement *element, GstStateChange transition);
646 void (*set_bus) (GstElement * element, GstBus * bus);
649 GstClock* (*provide_clock) (GstElement *element);
650 gboolean (*set_clock) (GstElement *element, GstClock *clock);
653 GstIndex* (*get_index) (GstElement *element);
654 void (*set_index) (GstElement *element, GstIndex *index);
656 /* query functions */
657 gboolean (*send_event) (GstElement *element, GstEvent *event);
659 const GstQueryType* (*get_query_types) (GstElement *element);
660 gboolean (*query) (GstElement *element, GstQuery *query);
663 /* FIXME-0.11: move up and replace details */
667 /* Virtual method for subclasses (additions) */
668 /* FIXME-0.11 Make this the default behaviour */
669 GstPad* (*request_new_pad_full) (GstElement *element, GstPadTemplate *templ,
670 const gchar* name, const GstCaps *caps);
673 gpointer _gst_reserved[GST_PADDING-2];
676 /* element class pad templates */
677 void gst_element_class_add_pad_template (GstElementClass *klass, GstPadTemplate *templ);
678 GstPadTemplate* gst_element_class_get_pad_template (GstElementClass *element_class, const gchar *name);
679 GList* gst_element_class_get_pad_template_list (GstElementClass *element_class);
681 /* element class meta data */
682 void gst_element_class_set_documentation_uri (GstElementClass * klass, const gchar *uri);
683 void gst_element_class_set_icon_name (GstElementClass * klass, const gchar *name);
684 #ifndef GST_DISABLE_DEPRECATED
685 void gst_element_class_set_details (GstElementClass *klass, const GstElementDetails *details);
687 void gst_element_class_set_details_simple (GstElementClass *klass,
688 const gchar *longname,
689 const gchar *classification,
690 const gchar *description,
691 const gchar *author);
693 /* element instance */
694 GType gst_element_get_type (void);
696 /* basic name and parentage stuff from GstObject */
699 * gst_element_get_name:
700 * @elem: a #GstElement to get the name of @elem.
702 * Returns a copy of the name of @elem.
703 * Caller should g_free() the return value after usage.
704 * For a nameless element, this returns NULL, which you can safely g_free()
707 * Returns: (transfer full): the name of @elem. g_free() after usage. MT safe.
710 #define gst_element_get_name(elem) gst_object_get_name(GST_OBJECT_CAST(elem))
713 * gst_element_set_name:
714 * @elem: a #GstElement to set the name of.
715 * @name: the new name
717 * Sets the name of the element, getting rid of the old name if there was one.
719 #define gst_element_set_name(elem,name) gst_object_set_name(GST_OBJECT_CAST(elem),name)
722 * gst_element_get_parent:
723 * @elem: a #GstElement to get the parent of.
725 * Returns: (transfer full): the parent of an element.
727 #define gst_element_get_parent(elem) gst_object_get_parent(GST_OBJECT_CAST(elem))
730 * gst_element_set_parent:
731 * @elem: a #GstElement to set the parent of.
732 * @parent: the new parent #GstObject of the element.
734 * Sets the parent of an element.
736 #define gst_element_set_parent(elem,parent) gst_object_set_parent(GST_OBJECT_CAST(elem),parent)
739 gboolean gst_element_requires_clock (GstElement *element);
740 gboolean gst_element_provides_clock (GstElement *element);
741 GstClock* gst_element_provide_clock (GstElement *element);
742 GstClock* gst_element_get_clock (GstElement *element);
743 gboolean gst_element_set_clock (GstElement *element, GstClock *clock);
744 void gst_element_set_base_time (GstElement *element, GstClockTime time);
745 GstClockTime gst_element_get_base_time (GstElement *element);
746 void gst_element_set_start_time (GstElement *element, GstClockTime time);
747 GstClockTime gst_element_get_start_time (GstElement *element);
750 gboolean gst_element_is_indexable (GstElement *element);
751 void gst_element_set_index (GstElement *element, GstIndex *index);
752 GstIndex* gst_element_get_index (GstElement *element);
755 void gst_element_set_bus (GstElement * element, GstBus * bus);
756 GstBus * gst_element_get_bus (GstElement * element);
759 gboolean gst_element_add_pad (GstElement *element, GstPad *pad);
760 gboolean gst_element_remove_pad (GstElement *element, GstPad *pad);
761 void gst_element_no_more_pads (GstElement *element);
763 #ifndef GST_DISABLE_DEPRECATED
764 GstPad* gst_element_get_pad (GstElement *element, const gchar *name);
765 #endif /* GST_DISABLE_DEPRECATED */
766 GstPad* gst_element_get_static_pad (GstElement *element, const gchar *name);
767 GstPad* gst_element_get_request_pad (GstElement *element, const gchar *name);
768 GstPad* gst_element_request_pad (GstElement *element,
769 GstPadTemplate *templ,
770 const gchar * name, const GstCaps *caps);
771 void gst_element_release_request_pad (GstElement *element, GstPad *pad);
773 GstIterator * gst_element_iterate_pads (GstElement * element);
774 GstIterator * gst_element_iterate_src_pads (GstElement * element);
775 GstIterator * gst_element_iterate_sink_pads (GstElement * element);
777 /* event/query/format stuff */
778 gboolean gst_element_send_event (GstElement *element, GstEvent *event);
779 gboolean gst_element_seek (GstElement *element, gdouble rate,
780 GstFormat format, GstSeekFlags flags,
781 GstSeekType cur_type, gint64 cur,
782 GstSeekType stop_type, gint64 stop);
783 G_CONST_RETURN GstQueryType*
784 gst_element_get_query_types (GstElement *element);
785 gboolean gst_element_query (GstElement *element, GstQuery *query);
788 gboolean gst_element_post_message (GstElement * element, GstMessage * message);
791 /* gcc versions < 3.3 warn about NULL being passed as format to printf */
792 #if (defined(GST_USING_PRINTF_EXTENSION) || !defined(__GNUC__) || (__GNUC__ < 3) || (__GNUC__ == 3 && __GNUC_MINOR__ < 3))
793 gchar * _gst_element_error_printf (const gchar *format, ...);
795 gchar * _gst_element_error_printf (const gchar *format, ...) G_GNUC_PRINTF (1, 2);
797 void gst_element_message_full (GstElement * element, GstMessageType type,
798 GQuark domain, gint code, gchar * text,
799 gchar * debug, const gchar * file,
800 const gchar * function, gint line);
802 /* state management */
803 gboolean gst_element_is_locked_state (GstElement *element);
804 gboolean gst_element_set_locked_state (GstElement *element, gboolean locked_state);
805 gboolean gst_element_sync_state_with_parent (GstElement *element);
807 GstStateChangeReturn gst_element_get_state (GstElement * element,
810 GstClockTime timeout);
811 GstStateChangeReturn gst_element_set_state (GstElement *element, GstState state);
813 void gst_element_abort_state (GstElement * element);
814 GstStateChangeReturn gst_element_change_state (GstElement * element,
815 GstStateChange transition);
816 GstStateChangeReturn gst_element_continue_state (GstElement * element,
817 GstStateChangeReturn ret);
818 void gst_element_lost_state (GstElement * element);
819 void gst_element_lost_state_full (GstElement * element, gboolean new_base_time);
821 /* factory management */
822 GstElementFactory* gst_element_get_factory (GstElement *element);
826 #endif /* __GST_ELEMENT_H__ */