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);
239 typedef void (*GstPadBlockCallback) (GstPad *pad, gboolean blocked, gpointer user_data);
243 * @GST_PAD_UNKNOWN: direction is unknown.
244 * @GST_PAD_SRC: the pad is a source pad.
245 * @GST_PAD_SINK: the pad is a sink pad.
247 * The direction of a pad.
257 * @GST_PAD_BLOCKED: is dataflow on a pad blocked
258 * @GST_PAD_FLUSHING: is pad empying buffers
259 * @GST_PAD_IN_GETCAPS: GstPadGetCapsFunction() is running now
260 * @GST_PAD_IN_SETCAPS: GstPadSetCapsFunction() is running now
261 * @GST_PAD_FLAG_LAST: offset to define more flags
266 GST_PAD_BLOCKED = GST_OBJECT_FLAG_LAST,
272 GST_PAD_FLAG_LAST = GST_OBJECT_FLAG_LAST + 8
275 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
276 typedef struct _GstPadTemplate GstPadTemplate;
281 gpointer element_private;
283 GstPadTemplate *padtemplate;
285 /* direction cannot change after creating the pad */
286 GstPadDirection direction;
288 /*< public >*/ /* with STREAM_LOCK */
289 /* streaming rec_lock */
290 GStaticRecMutex *stream_rec_lock;
292 /*< public >*/ /* with PREROLL_LOCK */
293 GMutex *preroll_lock;
296 /*< public >*/ /* with LOCK */
297 /* block cond, mutex is from the object */
299 GstPadBlockCallback block_callback;
302 /* the pad capabilities */
304 GstPadGetCapsFunction getcapsfunc;
305 GstPadSetCapsFunction setcapsfunc;
306 GstPadAcceptCapsFunction acceptcapsfunc;
307 GstPadFixateCapsFunction fixatecapsfunc;
309 GstPadActivateFunction activatefunc;
310 GstPadActivateModeFunction activatepushfunc;
311 GstPadActivateModeFunction activatepullfunc;
314 GstPadLinkFunction linkfunc;
315 GstPadUnlinkFunction unlinkfunc;
318 gpointer sched_private;
320 /* data transport functions */
321 GstPadChainFunction chainfunc;
322 GstPadCheckGetRangeFunction checkgetrangefunc;
323 GstPadGetRangeFunction getrangefunc;
324 GstPadEventFunction eventfunc;
326 GstActivateMode mode;
328 /* generic query method */
329 GstPadQueryTypeFunction querytypefunc;
330 GstPadQueryFunction queryfunc;
333 GstPadIntLinkFunction intlinkfunc;
335 GstPadBufferAllocFunction bufferallocfunc;
337 /* whether to emit signals for have-data. counts number
338 * of handlers attached. */
339 gint do_buffer_signals;
340 gint do_event_signals;
343 gpointer _gst_reserved[GST_PADDING];
346 struct _GstPadClass {
347 GstObjectClass parent_class;
349 /* signal callbacks */
350 void (*linked) (GstPad *pad, GstPad *peer);
351 void (*unlinked) (GstPad *pad, GstPad *peer);
352 void (*request_link) (GstPad *pad);
353 gboolean (*have_data) (GstPad *pad, GstMiniObject *data);
356 gpointer _gst_reserved[GST_PADDING];
360 /***** helper macros *****/
362 #define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
363 #define GST_PAD_PARENT(pad) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(pad)))
364 #define GST_PAD_ELEMENT_PRIVATE(pad) (GST_PAD_CAST(pad)->element_private)
365 #define GST_PAD_PAD_TEMPLATE(pad) (GST_PAD_CAST(pad)->padtemplate)
366 #define GST_PAD_DIRECTION(pad) (GST_PAD_CAST(pad)->direction)
367 #define GST_PAD_TASK(pad) (GST_PAD_CAST(pad)->task)
368 #define GST_PAD_ACTIVATE_MODE(pad) (GST_PAD_CAST(pad)->mode)
370 #define GST_PAD_ACTIVATEFUNC(pad) (GST_PAD_CAST(pad)->activatefunc)
371 #define GST_PAD_ACTIVATEPUSHFUNC(pad) (GST_PAD_CAST(pad)->activatepushfunc)
372 #define GST_PAD_ACTIVATEPULLFUNC(pad) (GST_PAD_CAST(pad)->activatepullfunc)
373 #define GST_PAD_CHAINFUNC(pad) (GST_PAD_CAST(pad)->chainfunc)
374 #define GST_PAD_CHECKGETRANGEFUNC(pad) (GST_PAD_CAST(pad)->checkgetrangefunc)
375 #define GST_PAD_GETRANGEFUNC(pad) (GST_PAD_CAST(pad)->getrangefunc)
376 #define GST_PAD_EVENTFUNC(pad) (GST_PAD_CAST(pad)->eventfunc)
377 #define GST_PAD_QUERYTYPEFUNC(pad) (GST_PAD_CAST(pad)->querytypefunc)
378 #define GST_PAD_QUERYFUNC(pad) (GST_PAD_CAST(pad)->queryfunc)
379 #define GST_PAD_INTLINKFUNC(pad) (GST_PAD_CAST(pad)->intlinkfunc)
381 #define GST_PAD_PEER(pad) (GST_PAD_CAST(pad)->peer)
382 #define GST_PAD_LINKFUNC(pad) (GST_PAD_CAST(pad)->linkfunc)
383 #define GST_PAD_UNLINKFUNC(pad) (GST_PAD_CAST(pad)->unlinkfunc)
385 #define GST_PAD_CAPS(pad) (GST_PAD_CAST(pad)->caps)
386 #define GST_PAD_GETCAPSFUNC(pad) (GST_PAD_CAST(pad)->getcapsfunc)
387 #define GST_PAD_SETCAPSFUNC(pad) (GST_PAD_CAST(pad)->setcapsfunc)
388 #define GST_PAD_ACCEPTCAPSFUNC(pad) (GST_PAD_CAST(pad)->acceptcapsfunc)
389 #define GST_PAD_FIXATECAPSFUNC(pad) (GST_PAD_CAST(pad)->fixatecapsfunc)
391 #define GST_PAD_BUFFERALLOCFUNC(pad) (GST_PAD_CAST(pad)->bufferallocfunc)
393 #define GST_PAD_DO_BUFFER_SIGNALS(pad) (GST_PAD_CAST(pad)->do_buffer_signals)
394 #define GST_PAD_DO_EVENT_SIGNALS(pad) (GST_PAD_CAST(pad)->do_event_signals)
396 #define GST_PAD_IS_LINKED(pad) (GST_PAD_PEER(pad) != NULL)
397 #define GST_PAD_IS_BLOCKED(pad) (GST_FLAG_IS_SET (pad, GST_PAD_BLOCKED))
398 #define GST_PAD_IS_FLUSHING(pad) (GST_FLAG_IS_SET (pad, GST_PAD_FLUSHING))
399 #define GST_PAD_IS_IN_GETCAPS(pad) (GST_FLAG_IS_SET (pad, GST_PAD_IN_GETCAPS))
400 #define GST_PAD_IS_IN_SETCAPS(pad) (GST_FLAG_IS_SET (pad, GST_PAD_IN_SETCAPS))
401 #define GST_PAD_IS_USABLE(pad) (GST_PAD_IS_LINKED (pad) && \
402 !GST_PAD_IS_FLUSHING(pad) && !GST_PAD_IS_FLUSHING(GST_PAD_PEER (pad)))
403 #define GST_PAD_IS_SRC(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SRC)
404 #define GST_PAD_IS_SINK(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SINK)
406 #define GST_PAD_SET_FLUSHING(pad) (GST_FLAG_SET (pad, GST_PAD_FLUSHING))
407 #define GST_PAD_UNSET_FLUSHING(pad) (GST_FLAG_UNSET (pad, GST_PAD_FLUSHING))
409 #define GST_STREAM_GET_LOCK(pad) (GST_PAD_CAST(pad)->stream_rec_lock)
410 #define GST_STREAM_LOCK(pad) (g_static_rec_mutex_lock(GST_STREAM_GET_LOCK(pad)))
411 #define GST_STREAM_TRYLOCK(pad) (g_static_rec_mutex_trylock(GST_STREAM_GET_LOCK(pad)))
412 #define GST_STREAM_UNLOCK(pad) (g_static_rec_mutex_unlock(GST_STREAM_GET_LOCK(pad)))
413 #define GST_STREAM_UNLOCK_FULL(pad) (g_static_rec_mutex_unlock_full(GST_STREAM_GET_LOCK(pad)))
414 #define GST_STREAM_LOCK_FULL(pad,t) (g_static_rec_mutex_lock_full(GST_STREAM_GET_LOCK(pad), t))
416 #define GST_PREROLL_GET_LOCK(pad) (GST_PAD_CAST(pad)->preroll_lock)
417 #define GST_PREROLL_LOCK(pad) (g_mutex_lock(GST_PREROLL_GET_LOCK(pad)))
418 #define GST_PREROLL_TRYLOCK(pad) (g_mutex_trylock(GST_PREROLL_GET_LOCK(pad)))
419 #define GST_PREROLL_UNLOCK(pad) (g_mutex_unlock(GST_PREROLL_GET_LOCK(pad)))
420 #define GST_PREROLL_GET_COND(pad) (GST_PAD_CAST(pad)->preroll_cond)
421 #define GST_PREROLL_WAIT(pad) g_cond_wait (GST_PREROLL_GET_COND (pad), GST_PREROLL_GET_LOCK (pad))
422 #define GST_PREROLL_TIMED_WAIT(pad, timeval) g_cond_timed_wait (GST_PREROLL_GET_COND (pad), GST_PREROLL_GET_LOCK (pad),\
424 #define GST_PREROLL_SIGNAL(pad) g_cond_signal (GST_PREROLL_GET_COND (pad));
425 #define GST_PREROLL_BROADCAST(pad) g_cond_broadcast (GST_PREROLL_GET_COND (pad));
427 #define GST_PAD_BLOCK_GET_COND(pad) (GST_PAD_CAST(pad)->block_cond)
428 #define GST_PAD_BLOCK_WAIT(pad) (g_cond_wait(GST_PAD_BLOCK_GET_COND (pad), GST_GET_LOCK (pad)))
429 #define GST_PAD_BLOCK_SIGNAL(pad) (g_cond_signal(GST_PAD_BLOCK_GET_COND (pad)))
431 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
432 #include <gst/gstpadtemplate.h>
434 GType gst_pad_get_type (void);
437 GstPad* gst_pad_new (const gchar *name, GstPadDirection direction);
438 GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name);
440 #define gst_pad_get_name(pad) gst_object_get_name (GST_OBJECT_CAST (pad))
441 #define gst_pad_get_parent(pad) gst_object_get_parent (GST_OBJECT_CAST (pad))
443 GstPadDirection gst_pad_get_direction (GstPad *pad);
445 gboolean gst_pad_set_active (GstPad *pad, gboolean active);
446 gboolean gst_pad_is_active (GstPad *pad);
447 gboolean gst_pad_activate_pull (GstPad *pad, gboolean active);
448 gboolean gst_pad_activate_push (GstPad *pad, gboolean active);
450 gboolean gst_pad_set_blocked (GstPad *pad, gboolean blocked);
451 gboolean gst_pad_set_blocked_async (GstPad *pad, gboolean blocked,
452 GstPadBlockCallback callback, gpointer user_data);
453 gboolean gst_pad_is_blocked (GstPad *pad);
455 void gst_pad_set_element_private (GstPad *pad, gpointer priv);
456 gpointer gst_pad_get_element_private (GstPad *pad);
458 GstPadTemplate* gst_pad_get_pad_template (GstPad *pad);
460 void gst_pad_set_bufferalloc_function (GstPad *pad, GstPadBufferAllocFunction bufalloc);
461 GstFlowReturn gst_pad_alloc_buffer (GstPad *pad, guint64 offset, gint size,
462 GstCaps *caps, GstBuffer **buf);
464 /* data passing setup functions */
465 void gst_pad_set_activate_function (GstPad *pad, GstPadActivateFunction activate);
466 void gst_pad_set_activatepull_function (GstPad *pad, GstPadActivateModeFunction activatepull);
467 void gst_pad_set_activatepush_function (GstPad *pad, GstPadActivateModeFunction activatepush);
468 void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain);
469 void gst_pad_set_getrange_function (GstPad *pad, GstPadGetRangeFunction get);
470 void gst_pad_set_checkgetrange_function (GstPad *pad, GstPadCheckGetRangeFunction check);
471 void gst_pad_set_event_function (GstPad *pad, GstPadEventFunction event);
474 void gst_pad_set_link_function (GstPad *pad, GstPadLinkFunction link);
475 void gst_pad_set_unlink_function (GstPad *pad, GstPadUnlinkFunction unlink);
477 GstPadLinkReturn gst_pad_link (GstPad *srcpad, GstPad *sinkpad);
478 gboolean gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad);
479 gboolean gst_pad_is_linked (GstPad *pad);
481 GstPad* gst_pad_get_peer (GstPad *pad);
483 /* capsnego functions */
484 void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps);
485 void gst_pad_set_acceptcaps_function (GstPad *pad, GstPadAcceptCapsFunction acceptcaps);
486 void gst_pad_set_fixatecaps_function (GstPad *pad, GstPadFixateCapsFunction fixatecaps);
487 void gst_pad_set_setcaps_function (GstPad *pad, GstPadSetCapsFunction setcaps);
489 G_CONST_RETURN GstCaps* gst_pad_get_pad_template_caps (GstPad *pad);
491 /* capsnego function for connected/unconnected pads */
492 GstCaps * gst_pad_get_caps (GstPad * pad);
493 void gst_pad_fixate_caps (GstPad * pad, GstCaps *caps);
494 gboolean gst_pad_accept_caps (GstPad * pad, GstCaps *caps);
495 gboolean gst_pad_set_caps (GstPad * pad, GstCaps *caps);
497 GstCaps * gst_pad_peer_get_caps (GstPad * pad);
498 gboolean gst_pad_peer_accept_caps (GstPad * pad, GstCaps *caps);
500 /* capsnego for connected pads */
501 GstCaps * gst_pad_get_allowed_caps (GstPad * srcpad);
502 GstCaps * gst_pad_get_negotiated_caps (GstPad * pad);
504 /* data passing functions to peer */
505 GstFlowReturn gst_pad_push (GstPad *pad, GstBuffer *buffer);
506 gboolean gst_pad_check_pull_range (GstPad *pad);
507 GstFlowReturn gst_pad_pull_range (GstPad *pad, guint64 offset, guint size,
509 gboolean gst_pad_push_event (GstPad *pad, GstEvent *event);
510 gboolean gst_pad_event_default (GstPad *pad, GstEvent *event);
512 /* data passing functions on pad */
513 GstFlowReturn gst_pad_chain (GstPad *pad, GstBuffer *buffer);
514 GstFlowReturn gst_pad_get_range (GstPad *pad, guint64 offset, guint size,
516 gboolean gst_pad_send_event (GstPad *pad, GstEvent *event);
519 gboolean gst_pad_start_task (GstPad *pad, GstTaskFunction func,
521 gboolean gst_pad_pause_task (GstPad *pad);
522 gboolean gst_pad_stop_task (GstPad *pad);
525 void gst_pad_set_internal_link_function (GstPad *pad, GstPadIntLinkFunction intlink);
526 GList* gst_pad_get_internal_links (GstPad *pad);
527 GList* gst_pad_get_internal_links_default (GstPad *pad);
529 /* generic query function */
530 void gst_pad_set_query_type_function (GstPad *pad, GstPadQueryTypeFunction type_func);
531 G_CONST_RETURN GstQueryType*
532 gst_pad_get_query_types (GstPad *pad);
533 G_CONST_RETURN GstQueryType*
534 gst_pad_get_query_types_default (GstPad *pad);
536 gboolean gst_pad_query (GstPad *pad, GstQuery *query);
537 void gst_pad_set_query_function (GstPad *pad, GstPadQueryFunction query);
538 gboolean gst_pad_query_default (GstPad *pad, GstQuery *query);
540 /* misc helper functions */
541 gboolean gst_pad_dispatcher (GstPad *pad, GstPadDispatcherFunction dispatch,
544 #ifndef GST_DISABLE_LOADSAVE
545 void gst_pad_load_and_link (xmlNodePtr self, GstObject *parent);
550 #endif /* __GST_PAD_H__ */