2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wim.taymans@chello.be>
5 * gstpad.h: Header for GstPad object
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.
27 #include <gst/gstconfig.h>
29 #include <gst/gstobject.h>
30 #include <gst/gstbuffer.h>
31 #include <gst/gstcaps.h>
32 #include <gst/gstevent.h>
33 #include <gst/gstquery.h>
34 #include <gst/gsttask.h>
38 GST_EXPORT GType _gst_pad_type;
43 #define GST_TYPE_PAD (_gst_pad_type)
44 #define GST_IS_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD))
45 #define GST_IS_PAD_FAST(obj) (G_OBJECT_TYPE(obj) == GST_TYPE_PAD) /* necessary? */
46 #define GST_IS_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
47 #define GST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD, GstPad))
48 #define GST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD, GstPadClass))
49 #define GST_PAD_CAST(obj) ((GstPad*)(obj))
51 typedef struct _GstPad GstPad;
52 typedef struct _GstPadClass GstPadClass;
56 * @GST_PAD_LINK_OK : link succeeded
57 * @GST_PAD_LINK_WRONG_HIERARCHY: pads have no common grandparent
58 * @GST_PAD_LINK_WAS_LINKED : pad was already linked
59 * @GST_PAD_LINK_WRONG_DIRECTION: pads have wrong direction
60 * @GST_PAD_LINK_NOFORMAT : pads do not have common format
61 * @GST_PAD_LINK_NOSCHED : pads cannot cooperate in scheduling
62 * @GST_PAD_LINK_REFUSED : refused for some reason
66 GST_PAD_LINK_WRONG_HIERARCHY = -1,
67 GST_PAD_LINK_WAS_LINKED = -2,
68 GST_PAD_LINK_WRONG_DIRECTION = -3,
69 GST_PAD_LINK_NOFORMAT = -4,
70 GST_PAD_LINK_NOSCHED = -5,
71 GST_PAD_LINK_REFUSED = -6,
75 * GST_PAD_LINK_FAILED:
76 * @ret: the #GstPadLinkReturn value
78 * Macro to test if the given #GstPadLinkReturn value indicates a failed
79 * negotiation step (REFUSED/DELAYED).
81 #define GST_PAD_LINK_FAILED(ret) ((ret) < GST_PAD_LINK_OK)
84 * GST_PAD_LINK_SUCCESSFUL:
85 * @ret: the #GstPadLinkReturn value
87 * Macro to test if the given #GstPadLinkReturn value indicates a successfull
88 * negotiation step (OK/DONE).
90 #define GST_PAD_LINK_SUCCESSFUL(ret) ((ret) >= GST_PAD_LINK_OK)
93 GST_FLOW_RESEND = 1, /* resend buffer, possibly with new caps */
94 GST_FLOW_OK = 0, /* data passing was ok */
95 /* expected failures */
96 GST_FLOW_NOT_LINKED = -1, /* pad is not linked */
97 GST_FLOW_WRONG_STATE = -2, /* pad is in wrong state */
99 GST_FLOW_UNEXPECTED = -3, /* did not expect anything, like after EOS */
100 GST_FLOW_NOT_NEGOTIATED = -4, /* pad is not negotiated */
101 GST_FLOW_ERROR = -5, /* some (fatal) error occured */
102 GST_FLOW_NOT_SUPPORTED = -6 /* function not supported */
105 #define GST_FLOW_IS_FATAL(ret) ((ret) <= GST_FLOW_UNEXPECTED)
113 #define GST_PAD_MODE_ACTIVATE(mode) ((mode) != GST_ACTIVATE_NONE)
116 typedef gboolean (*GstPadActivateFunction) (GstPad *pad);
117 typedef gboolean (*GstPadActivateModeFunction) (GstPad *pad, gboolean active);
122 * GstPadChainFunction:
123 * @pad: the #GstPad that performed the chain.
124 * @buffer: the #GstBuffer that is chained.
126 * A function that will be called when chaining buffers.
128 * Returns: GST_FLOW_OK for success
130 typedef GstFlowReturn (*GstPadChainFunction) (GstPad *pad, GstBuffer *buffer);
131 typedef GstFlowReturn (*GstPadGetRangeFunction) (GstPad *pad, guint64 offset,
132 guint length, GstBuffer **buffer);
135 * GstPadEventFunction:
136 * @pad: the #GstPad to handle the event.
137 * @event: the #GstEvent to handle.
139 * Function signature to handle an event for the pad.
141 * Returns: TRUE if the pad could handle the event.
143 typedef gboolean (*GstPadEventFunction) (GstPad *pad, GstEvent *event);
146 /* deprecate me, check range should use seeking query */
147 typedef gboolean (*GstPadCheckGetRangeFunction) (GstPad *pad);
152 * GstPadIntLinkFunction:
153 * @pad: The #GstPad to query.
155 * The signature of the internal pad link function.
157 * Returns: a newly allocated #GList of pads that are linked to the given pad on
158 * the inside of the parent element.
159 * The caller must call g_list_free() on it after use.
162 typedef GList* (*GstPadIntLinkFunction) (GstPad *pad);
165 /* generic query function */
167 * GstPadQueryTypeFunction:
168 * @pad: a #GstPad to query
170 * The signature of the query types function.
172 * Returns: an array of query types
174 typedef const GstQueryType* (*GstPadQueryTypeFunction) (GstPad *pad);
177 * GstPadQueryFunction:
178 * @pad: the #GstPad to query.
179 * @query: the #GstQuery object to execute
181 * The signature of the query function.
183 * Returns: TRUE if the query could be performed.
185 typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstQuery *query);
191 * @pad: the #GstPad that is linked.
192 * @peer: the peer #GstPad of the link
194 * Function signature to handle a new link on the pad.
196 * Returns: the result of the link with the specified peer.
198 typedef GstPadLinkReturn (*GstPadLinkFunction) (GstPad *pad, GstPad *peer);
200 * GstPadUnlinkFunction
201 * @pad: the #GstPad that is linked.
203 * Function signature to handle a unlinking the pad prom its peer.
205 typedef void (*GstPadUnlinkFunction) (GstPad *pad);
210 * GstPadGetCapsFunction:
211 * @pad: the #GstPad to get the capabilities of.
213 * Returns a copy of the capabilities of the specified pad. By default this
214 * function will return the pad template capabilities, but can optionally
217 * Returns: a newly allocated copy #GstCaps of the pad.
219 typedef GstCaps* (*GstPadGetCapsFunction) (GstPad *pad);
220 typedef gboolean (*GstPadSetCapsFunction) (GstPad *pad, GstCaps *caps);
221 typedef gboolean (*GstPadAcceptCapsFunction) (GstPad *pad, GstCaps *caps);
222 typedef void (*GstPadFixateCapsFunction) (GstPad *pad, GstCaps *caps);
223 typedef GstFlowReturn (*GstPadBufferAllocFunction) (GstPad *pad, guint64 offset, guint size,
224 GstCaps *caps, GstBuffer **buf);
228 * GstPadDispatcherFunction:
229 * @pad: the #GstPad that is dispatched.
230 * @data: the gpointer to optional user data.
232 * A dispatcher function is called for all internally linked pads, see
233 * gst_pad_dispatcher().
235 * Returns: TRUE if the dispatching procedure has to be stopped.
237 typedef gboolean (*GstPadDispatcherFunction) (GstPad *pad, gpointer data);
240 * GstPadBlockCallback:
241 * @pad: the #GstPad that is blockend or unblocked.
242 * @blocked: blocking state for the pad
243 * @user_data: the gpointer to optional user data.
245 * Callback used by gst_pad_set_blocked_async(). Gets called when the blocking
246 * operation succeeds.
249 typedef void (*GstPadBlockCallback) (GstPad *pad, gboolean blocked, gpointer user_data);
253 * @GST_PAD_UNKNOWN: direction is unknown.
254 * @GST_PAD_SRC: the pad is a source pad.
255 * @GST_PAD_SINK: the pad is a sink pad.
257 * The direction of a pad.
267 * @GST_PAD_BLOCKED: is dataflow on a pad blocked
268 * @GST_PAD_FLUSHING: is pad empying buffers
269 * @GST_PAD_IN_GETCAPS: GstPadGetCapsFunction() is running now
270 * @GST_PAD_IN_SETCAPS: GstPadSetCapsFunction() is running now
271 * @GST_PAD_FLAG_LAST: offset to define more flags
276 GST_PAD_BLOCKED = GST_OBJECT_FLAG_LAST,
282 GST_PAD_FLAG_LAST = GST_OBJECT_FLAG_LAST + 8
285 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
286 typedef struct _GstPadTemplate GstPadTemplate;
291 gpointer element_private;
293 GstPadTemplate *padtemplate;
295 /* direction cannot change after creating the pad */
296 GstPadDirection direction;
298 /*< public >*/ /* with STREAM_LOCK */
299 /* streaming rec_lock */
300 GStaticRecMutex *stream_rec_lock;
302 /*< public >*/ /* with PREROLL_LOCK */
303 GMutex *preroll_lock;
306 /*< public >*/ /* with LOCK */
307 /* block cond, mutex is from the object */
309 GstPadBlockCallback block_callback;
312 /* the pad capabilities */
314 GstPadGetCapsFunction getcapsfunc;
315 GstPadSetCapsFunction setcapsfunc;
316 GstPadAcceptCapsFunction acceptcapsfunc;
317 GstPadFixateCapsFunction fixatecapsfunc;
319 GstPadActivateFunction activatefunc;
320 GstPadActivateModeFunction activatepushfunc;
321 GstPadActivateModeFunction activatepullfunc;
324 GstPadLinkFunction linkfunc;
325 GstPadUnlinkFunction unlinkfunc;
328 gpointer sched_private;
330 /* data transport functions */
331 GstPadChainFunction chainfunc;
332 GstPadCheckGetRangeFunction checkgetrangefunc;
333 GstPadGetRangeFunction getrangefunc;
334 GstPadEventFunction eventfunc;
336 GstActivateMode mode;
338 /* generic query method */
339 GstPadQueryTypeFunction querytypefunc;
340 GstPadQueryFunction queryfunc;
343 GstPadIntLinkFunction intlinkfunc;
345 GstPadBufferAllocFunction bufferallocfunc;
347 /* whether to emit signals for have-data. counts number
348 * of handlers attached. */
349 gint do_buffer_signals;
350 gint do_event_signals;
353 gpointer _gst_reserved[GST_PADDING];
356 struct _GstPadClass {
357 GstObjectClass parent_class;
359 /* signal callbacks */
360 void (*linked) (GstPad *pad, GstPad *peer);
361 void (*unlinked) (GstPad *pad, GstPad *peer);
362 void (*request_link) (GstPad *pad);
363 gboolean (*have_data) (GstPad *pad, GstMiniObject *data);
366 gpointer _gst_reserved[GST_PADDING];
370 /***** helper macros *****/
372 #define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
373 #define GST_PAD_PARENT(pad) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(pad)))
374 #define GST_PAD_ELEMENT_PRIVATE(pad) (GST_PAD_CAST(pad)->element_private)
375 #define GST_PAD_PAD_TEMPLATE(pad) (GST_PAD_CAST(pad)->padtemplate)
376 #define GST_PAD_DIRECTION(pad) (GST_PAD_CAST(pad)->direction)
377 #define GST_PAD_TASK(pad) (GST_PAD_CAST(pad)->task)
378 #define GST_PAD_ACTIVATE_MODE(pad) (GST_PAD_CAST(pad)->mode)
380 #define GST_PAD_ACTIVATEFUNC(pad) (GST_PAD_CAST(pad)->activatefunc)
381 #define GST_PAD_ACTIVATEPUSHFUNC(pad) (GST_PAD_CAST(pad)->activatepushfunc)
382 #define GST_PAD_ACTIVATEPULLFUNC(pad) (GST_PAD_CAST(pad)->activatepullfunc)
383 #define GST_PAD_CHAINFUNC(pad) (GST_PAD_CAST(pad)->chainfunc)
384 #define GST_PAD_CHECKGETRANGEFUNC(pad) (GST_PAD_CAST(pad)->checkgetrangefunc)
385 #define GST_PAD_GETRANGEFUNC(pad) (GST_PAD_CAST(pad)->getrangefunc)
386 #define GST_PAD_EVENTFUNC(pad) (GST_PAD_CAST(pad)->eventfunc)
387 #define GST_PAD_QUERYTYPEFUNC(pad) (GST_PAD_CAST(pad)->querytypefunc)
388 #define GST_PAD_QUERYFUNC(pad) (GST_PAD_CAST(pad)->queryfunc)
389 #define GST_PAD_INTLINKFUNC(pad) (GST_PAD_CAST(pad)->intlinkfunc)
391 #define GST_PAD_PEER(pad) (GST_PAD_CAST(pad)->peer)
392 #define GST_PAD_LINKFUNC(pad) (GST_PAD_CAST(pad)->linkfunc)
393 #define GST_PAD_UNLINKFUNC(pad) (GST_PAD_CAST(pad)->unlinkfunc)
395 #define GST_PAD_CAPS(pad) (GST_PAD_CAST(pad)->caps)
396 #define GST_PAD_GETCAPSFUNC(pad) (GST_PAD_CAST(pad)->getcapsfunc)
397 #define GST_PAD_SETCAPSFUNC(pad) (GST_PAD_CAST(pad)->setcapsfunc)
398 #define GST_PAD_ACCEPTCAPSFUNC(pad) (GST_PAD_CAST(pad)->acceptcapsfunc)
399 #define GST_PAD_FIXATECAPSFUNC(pad) (GST_PAD_CAST(pad)->fixatecapsfunc)
401 #define GST_PAD_BUFFERALLOCFUNC(pad) (GST_PAD_CAST(pad)->bufferallocfunc)
403 #define GST_PAD_DO_BUFFER_SIGNALS(pad) (GST_PAD_CAST(pad)->do_buffer_signals)
404 #define GST_PAD_DO_EVENT_SIGNALS(pad) (GST_PAD_CAST(pad)->do_event_signals)
406 #define GST_PAD_IS_LINKED(pad) (GST_PAD_PEER(pad) != NULL)
407 #define GST_PAD_IS_BLOCKED(pad) (GST_FLAG_IS_SET (pad, GST_PAD_BLOCKED))
408 #define GST_PAD_IS_FLUSHING(pad) (GST_FLAG_IS_SET (pad, GST_PAD_FLUSHING))
409 #define GST_PAD_IS_IN_GETCAPS(pad) (GST_FLAG_IS_SET (pad, GST_PAD_IN_GETCAPS))
410 #define GST_PAD_IS_IN_SETCAPS(pad) (GST_FLAG_IS_SET (pad, GST_PAD_IN_SETCAPS))
411 #define GST_PAD_IS_USABLE(pad) (GST_PAD_IS_LINKED (pad) && \
412 !GST_PAD_IS_FLUSHING(pad) && !GST_PAD_IS_FLUSHING(GST_PAD_PEER (pad)))
413 #define GST_PAD_IS_SRC(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SRC)
414 #define GST_PAD_IS_SINK(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SINK)
416 #define GST_PAD_SET_FLUSHING(pad) (GST_FLAG_SET (pad, GST_PAD_FLUSHING))
417 #define GST_PAD_UNSET_FLUSHING(pad) (GST_FLAG_UNSET (pad, GST_PAD_FLUSHING))
419 #define GST_STREAM_GET_LOCK(pad) (GST_PAD_CAST(pad)->stream_rec_lock)
420 #define GST_STREAM_LOCK(pad) (g_static_rec_mutex_lock(GST_STREAM_GET_LOCK(pad)))
421 #define GST_STREAM_TRYLOCK(pad) (g_static_rec_mutex_trylock(GST_STREAM_GET_LOCK(pad)))
422 #define GST_STREAM_UNLOCK(pad) (g_static_rec_mutex_unlock(GST_STREAM_GET_LOCK(pad)))
423 #define GST_STREAM_UNLOCK_FULL(pad) (g_static_rec_mutex_unlock_full(GST_STREAM_GET_LOCK(pad)))
424 #define GST_STREAM_LOCK_FULL(pad,t) (g_static_rec_mutex_lock_full(GST_STREAM_GET_LOCK(pad), t))
426 #define GST_PREROLL_GET_LOCK(pad) (GST_PAD_CAST(pad)->preroll_lock)
427 #define GST_PREROLL_LOCK(pad) (g_mutex_lock(GST_PREROLL_GET_LOCK(pad)))
428 #define GST_PREROLL_TRYLOCK(pad) (g_mutex_trylock(GST_PREROLL_GET_LOCK(pad)))
429 #define GST_PREROLL_UNLOCK(pad) (g_mutex_unlock(GST_PREROLL_GET_LOCK(pad)))
430 #define GST_PREROLL_GET_COND(pad) (GST_PAD_CAST(pad)->preroll_cond)
431 #define GST_PREROLL_WAIT(pad) g_cond_wait (GST_PREROLL_GET_COND (pad), GST_PREROLL_GET_LOCK (pad))
432 #define GST_PREROLL_TIMED_WAIT(pad, timeval) g_cond_timed_wait (GST_PREROLL_GET_COND (pad), GST_PREROLL_GET_LOCK (pad),\
434 #define GST_PREROLL_SIGNAL(pad) g_cond_signal (GST_PREROLL_GET_COND (pad));
435 #define GST_PREROLL_BROADCAST(pad) g_cond_broadcast (GST_PREROLL_GET_COND (pad));
437 #define GST_PAD_BLOCK_GET_COND(pad) (GST_PAD_CAST(pad)->block_cond)
438 #define GST_PAD_BLOCK_WAIT(pad) (g_cond_wait(GST_PAD_BLOCK_GET_COND (pad), GST_GET_LOCK (pad)))
439 #define GST_PAD_BLOCK_SIGNAL(pad) (g_cond_signal(GST_PAD_BLOCK_GET_COND (pad)))
441 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
442 #include <gst/gstpadtemplate.h>
444 GType gst_pad_get_type (void);
447 GstPad* gst_pad_new (const gchar *name, GstPadDirection direction);
448 GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name);
452 * @pad: the pad to get the name from
454 * Returns a copy of the name of the pad.
456 * Returns: the name of the pad. g_free() after usage.
460 #define gst_pad_get_name(pad) gst_object_get_name (GST_OBJECT_CAST (pad))
462 * gst_pad_get_parent:
463 * @pad: the pad to get the parent of
465 * Returns the parent of @pad. This function increases the refcount
466 * of the parent object so you should gst_object_unref() it after usage.
468 * Returns: parent of the object, this can be NULL if the pad has no
469 * parent. unref after usage.
473 #define gst_pad_get_parent(pad) gst_object_get_parent (GST_OBJECT_CAST (pad))
475 GstPadDirection gst_pad_get_direction (GstPad *pad);
477 gboolean gst_pad_set_active (GstPad *pad, gboolean active);
478 gboolean gst_pad_is_active (GstPad *pad);
479 gboolean gst_pad_activate_pull (GstPad *pad, gboolean active);
480 gboolean gst_pad_activate_push (GstPad *pad, gboolean active);
482 gboolean gst_pad_set_blocked (GstPad *pad, gboolean blocked);
483 gboolean gst_pad_set_blocked_async (GstPad *pad, gboolean blocked,
484 GstPadBlockCallback callback, gpointer user_data);
485 gboolean gst_pad_is_blocked (GstPad *pad);
487 void gst_pad_set_element_private (GstPad *pad, gpointer priv);
488 gpointer gst_pad_get_element_private (GstPad *pad);
490 GstPadTemplate* gst_pad_get_pad_template (GstPad *pad);
492 void gst_pad_set_bufferalloc_function (GstPad *pad, GstPadBufferAllocFunction bufalloc);
493 GstFlowReturn gst_pad_alloc_buffer (GstPad *pad, guint64 offset, gint size,
494 GstCaps *caps, GstBuffer **buf);
496 /* data passing setup functions */
497 void gst_pad_set_activate_function (GstPad *pad, GstPadActivateFunction activate);
498 void gst_pad_set_activatepull_function (GstPad *pad, GstPadActivateModeFunction activatepull);
499 void gst_pad_set_activatepush_function (GstPad *pad, GstPadActivateModeFunction activatepush);
500 void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain);
501 void gst_pad_set_getrange_function (GstPad *pad, GstPadGetRangeFunction get);
502 void gst_pad_set_checkgetrange_function (GstPad *pad, GstPadCheckGetRangeFunction check);
503 void gst_pad_set_event_function (GstPad *pad, GstPadEventFunction event);
506 void gst_pad_set_link_function (GstPad *pad, GstPadLinkFunction link);
507 void gst_pad_set_unlink_function (GstPad *pad, GstPadUnlinkFunction unlink);
509 GstPadLinkReturn gst_pad_link (GstPad *srcpad, GstPad *sinkpad);
510 gboolean gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad);
511 gboolean gst_pad_is_linked (GstPad *pad);
513 GstPad* gst_pad_get_peer (GstPad *pad);
515 /* capsnego functions */
516 void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps);
517 void gst_pad_set_acceptcaps_function (GstPad *pad, GstPadAcceptCapsFunction acceptcaps);
518 void gst_pad_set_fixatecaps_function (GstPad *pad, GstPadFixateCapsFunction fixatecaps);
519 void gst_pad_set_setcaps_function (GstPad *pad, GstPadSetCapsFunction setcaps);
521 G_CONST_RETURN GstCaps* gst_pad_get_pad_template_caps (GstPad *pad);
523 /* capsnego function for connected/unconnected pads */
524 GstCaps * gst_pad_get_caps (GstPad * pad);
525 void gst_pad_fixate_caps (GstPad * pad, GstCaps *caps);
526 gboolean gst_pad_accept_caps (GstPad * pad, GstCaps *caps);
527 gboolean gst_pad_set_caps (GstPad * pad, GstCaps *caps);
529 GstCaps * gst_pad_peer_get_caps (GstPad * pad);
530 gboolean gst_pad_peer_accept_caps (GstPad * pad, GstCaps *caps);
532 /* capsnego for connected pads */
533 GstCaps * gst_pad_get_allowed_caps (GstPad * srcpad);
534 GstCaps * gst_pad_get_negotiated_caps (GstPad * pad);
536 /* data passing functions to peer */
537 GstFlowReturn gst_pad_push (GstPad *pad, GstBuffer *buffer);
538 gboolean gst_pad_check_pull_range (GstPad *pad);
539 GstFlowReturn gst_pad_pull_range (GstPad *pad, guint64 offset, guint size,
541 gboolean gst_pad_push_event (GstPad *pad, GstEvent *event);
542 gboolean gst_pad_event_default (GstPad *pad, GstEvent *event);
544 /* data passing functions on pad */
545 GstFlowReturn gst_pad_chain (GstPad *pad, GstBuffer *buffer);
546 GstFlowReturn gst_pad_get_range (GstPad *pad, guint64 offset, guint size,
548 gboolean gst_pad_send_event (GstPad *pad, GstEvent *event);
551 gboolean gst_pad_start_task (GstPad *pad, GstTaskFunction func,
553 gboolean gst_pad_pause_task (GstPad *pad);
554 gboolean gst_pad_stop_task (GstPad *pad);
557 void gst_pad_set_internal_link_function (GstPad *pad, GstPadIntLinkFunction intlink);
558 GList* gst_pad_get_internal_links (GstPad *pad);
559 GList* gst_pad_get_internal_links_default (GstPad *pad);
561 /* generic query function */
562 void gst_pad_set_query_type_function (GstPad *pad, GstPadQueryTypeFunction type_func);
563 G_CONST_RETURN GstQueryType*
564 gst_pad_get_query_types (GstPad *pad);
565 G_CONST_RETURN GstQueryType*
566 gst_pad_get_query_types_default (GstPad *pad);
568 gboolean gst_pad_query (GstPad *pad, GstQuery *query);
569 void gst_pad_set_query_function (GstPad *pad, GstPadQueryFunction query);
570 gboolean gst_pad_query_default (GstPad *pad, GstQuery *query);
572 /* misc helper functions */
573 gboolean gst_pad_dispatcher (GstPad *pad, GstPadDispatcherFunction dispatch,
576 #ifndef GST_DISABLE_LOADSAVE
577 void gst_pad_load_and_link (xmlNodePtr self, GstObject *parent);
582 #endif /* __GST_PAD_H__ */