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/gstqueryutils.h>
35 #include <gst/gsttask.h>
39 GST_EXPORT GType _gst_pad_type;
44 #define GST_TYPE_PAD (_gst_pad_type)
45 #define GST_IS_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD))
46 #define GST_IS_PAD_FAST(obj) (G_OBJECT_TYPE(obj) == GST_TYPE_PAD) /* necessary? */
47 #define GST_IS_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
48 #define GST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD, GstPad))
49 #define GST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD, GstPadClass))
50 #define GST_PAD_CAST(obj) ((GstPad*)(obj))
52 typedef struct _GstPad GstPad;
53 typedef struct _GstPadClass GstPadClass;
57 * @GST_PAD_LINK_OK : link succeeded
58 * @GST_PAD_LINK_WRONG_HIERARCHY: pads have no common grandparent
59 * @GST_PAD_LINK_WAS_LINKED : pad was already linked
60 * @GST_PAD_LINK_WRONG_DIRECTION: pads have wrong direction
61 * @GST_PAD_LINK_NOFORMAT : pads do not have common format
62 * @GST_PAD_LINK_NOSCHED : pads cannot cooperate in scheduling
63 * @GST_PAD_LINK_REFUSED : refused for some reason
67 GST_PAD_LINK_WRONG_HIERARCHY = -1,
68 GST_PAD_LINK_WAS_LINKED = -2,
69 GST_PAD_LINK_WRONG_DIRECTION = -3,
70 GST_PAD_LINK_NOFORMAT = -4,
71 GST_PAD_LINK_NOSCHED = -5,
72 GST_PAD_LINK_REFUSED = -6,
76 * GST_PAD_LINK_FAILED:
77 * @ret: the #GstPadLinkReturn value
79 * Macro to test if the given #GstPadLinkReturn value indicates a failed
80 * negotiation step (REFUSED/DELAYED).
82 #define GST_PAD_LINK_FAILED(ret) ((ret) < GST_PAD_LINK_OK)
85 * GST_PAD_LINK_SUCCESSFUL:
86 * @ret: the #GstPadLinkReturn value
88 * Macro to test if the given #GstPadLinkReturn value indicates a successfull
89 * negotiation step (OK/DONE).
91 #define GST_PAD_LINK_SUCCESSFUL(ret) ((ret) >= GST_PAD_LINK_OK)
94 GST_FLOW_RESEND = 1, /* resend buffer, possibly with new caps */
95 GST_FLOW_OK = 0, /* data passing was ok */
96 /* expected failures */
97 GST_FLOW_NOT_LINKED = -1, /* pad is not linked */
98 GST_FLOW_WRONG_STATE = -2, /* pad is in wrong state */
100 GST_FLOW_UNEXPECTED = -3, /* did not expect anything, like after EOS */
101 GST_FLOW_NOT_NEGOTIATED = -4, /* pad is not negotiated */
102 GST_FLOW_ERROR = -5, /* some (fatal) error occured */
103 GST_FLOW_NOT_SUPPORTED = -6 /* function not supported */
106 #define GST_FLOW_IS_FATAL(ret) ((ret) <= GST_FLOW_UNEXPECTED)
114 #define GST_PAD_MODE_ACTIVATE(mode) ((mode) != GST_ACTIVATE_NONE)
117 typedef gboolean (*GstPadActivateFunction) (GstPad *pad);
118 typedef gboolean (*GstPadActivateModeFunction) (GstPad *pad, gboolean active);
123 * GstPadChainFunction:
124 * @pad: the #GstPad that performed the chain.
125 * @buffer: the #GstBuffer that is chained.
127 * A function that will be called when chaining buffers.
131 typedef GstFlowReturn (*GstPadChainFunction) (GstPad *pad, GstBuffer *buffer);
132 typedef GstFlowReturn (*GstPadGetRangeFunction) (GstPad *pad, guint64 offset,
133 guint length, GstBuffer **buffer);
136 * GstPadEventFunction:
137 * @pad: the #GstPad to handle the event.
138 * @event: the #GstEvent to handle.
140 * Function signature to handle an event for the pad.
142 * Returns: TRUE if the pad could handle the event.
144 typedef gboolean (*GstPadEventFunction) (GstPad *pad, GstEvent *event);
147 /* deprecate me, check range should use seeking query */
148 typedef gboolean (*GstPadCheckGetRangeFunction) (GstPad *pad);
153 * GstPadIntLinkFunction:
154 * @pad: The #GstPad to query.
156 * The signature of the internal pad link function.
158 * Returns: a newly allocated #GList of pads that are linked to the given pad on
159 * the inside of the parent element.
160 * The caller must call g_list_free() on it after use.
163 typedef GList* (*GstPadIntLinkFunction) (GstPad *pad);
166 /* generic query function */
168 * GstPadQueryTypeFunction:
169 * @pad: a #GstPad to query
171 * The signature of the query types function.
173 * Returns: an array of query types
175 typedef const GstQueryType* (*GstPadQueryTypeFunction) (GstPad *pad);
178 * GstPadQueryFunction:
179 * @pad: the #GstPad to query.
180 * @query: the #GstQuery object to execute
182 * The signature of the query function.
184 * Returns: TRUE if the query could be performed.
186 typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstQuery *query);
192 * @pad: the #GstPad that is linked.
193 * @peer: the peer #GstPad of the link
195 * Function signature to handle a new link on the pad.
197 * Returns: the result of the link with the specified peer.
199 typedef GstPadLinkReturn (*GstPadLinkFunction) (GstPad *pad, GstPad *peer);
201 * GstPadUnlinkFunction
202 * @pad: the #GstPad that is linked.
204 * Function signature to handle a unlinking the pad prom its peer.
206 typedef void (*GstPadUnlinkFunction) (GstPad *pad);
211 * GstPadGetCapsFunction:
212 * @pad: the #GstPad to get the capabilities of.
214 * Returns a copy of the capabilities of the specified pad. By default this
215 * function will return the pad template capabilities, but can optionally
218 * Returns: a newly allocated copy #GstCaps of the pad.
220 typedef GstCaps* (*GstPadGetCapsFunction) (GstPad *pad);
221 typedef gboolean (*GstPadSetCapsFunction) (GstPad *pad, GstCaps *caps);
222 typedef gboolean (*GstPadAcceptCapsFunction) (GstPad *pad, GstCaps *caps);
223 typedef void (*GstPadFixateCapsFunction) (GstPad *pad, GstCaps *caps);
224 typedef GstFlowReturn (*GstPadBufferAllocFunction) (GstPad *pad, guint64 offset, guint size,
225 GstCaps *caps, GstBuffer **buf);
229 * GstPadDispatcherFunction:
230 * @pad: the #GstPad that is dispatched.
231 * @data: the gpointer to optional user data.
233 * A dispatcher function is called for all internally linked pads, see
234 * gst_pad_dispatcher().
236 * Returns: TRUE if the dispatching procedure has to be stopped.
238 typedef gboolean (*GstPadDispatcherFunction) (GstPad *pad, gpointer data);
240 typedef void (*GstPadBlockCallback) (GstPad *pad, gboolean blocked, gpointer user_data);
244 * @GST_PAD_UNKNOWN: direction is unknown.
245 * @GST_PAD_SRC: the pad is a source pad.
246 * @GST_PAD_SINK: the pad is a sink pad.
248 * The direction of a pad.
257 GST_PAD_BLOCKED = GST_OBJECT_FLAG_LAST,
262 GST_PAD_FLAG_LAST = GST_OBJECT_FLAG_LAST + 8
265 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
266 typedef struct _GstPadTemplate GstPadTemplate;
271 gpointer element_private;
273 GstPadTemplate *padtemplate;
275 /* direction cannot change after creating the pad */
276 GstPadDirection direction;
278 /*< public >*/ /* with STREAM_LOCK */
279 /* streaming rec_lock */
280 GStaticRecMutex *stream_rec_lock;
282 /*< public >*/ /* with PREROLL_LOCK */
283 GMutex *preroll_lock;
286 /*< public >*/ /* with LOCK */
287 /* block cond, mutex is from the object */
289 GstPadBlockCallback block_callback;
292 /* the pad capabilities */
294 GstPadGetCapsFunction getcapsfunc;
295 GstPadSetCapsFunction setcapsfunc;
296 GstPadAcceptCapsFunction acceptcapsfunc;
297 GstPadFixateCapsFunction fixatecapsfunc;
299 GstPadActivateFunction activatefunc;
300 GstPadActivateModeFunction activatepushfunc;
301 GstPadActivateModeFunction activatepullfunc;
304 GstPadLinkFunction linkfunc;
305 GstPadUnlinkFunction unlinkfunc;
308 gpointer sched_private;
310 /* data transport functions */
311 GstPadChainFunction chainfunc;
312 GstPadCheckGetRangeFunction checkgetrangefunc;
313 GstPadGetRangeFunction getrangefunc;
314 GstPadEventFunction eventfunc;
316 GstActivateMode mode;
318 /* generic query method */
319 GstPadQueryTypeFunction querytypefunc;
320 GstPadQueryFunction queryfunc;
323 GstPadIntLinkFunction intlinkfunc;
325 GstPadBufferAllocFunction bufferallocfunc;
327 /* whether to emit signals for have-data. counts number
328 * of handlers attached. */
329 gint do_buffer_signals;
330 gint do_event_signals;
333 gpointer _gst_reserved[GST_PADDING];
336 struct _GstPadClass {
337 GstObjectClass parent_class;
339 /* signal callbacks */
340 void (*linked) (GstPad *pad, GstPad *peer);
341 void (*unlinked) (GstPad *pad, GstPad *peer);
342 void (*request_link) (GstPad *pad);
343 gboolean (*have_data) (GstPad *pad, GstMiniObject *data);
346 gpointer _gst_reserved[GST_PADDING];
350 /***** helper macros *****/
352 #define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
353 #define GST_PAD_PARENT(pad) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(pad)))
354 #define GST_PAD_ELEMENT_PRIVATE(pad) (GST_PAD_CAST(pad)->element_private)
355 #define GST_PAD_PAD_TEMPLATE(pad) (GST_PAD_CAST(pad)->padtemplate)
356 #define GST_PAD_DIRECTION(pad) (GST_PAD_CAST(pad)->direction)
357 #define GST_PAD_TASK(pad) (GST_PAD_CAST(pad)->task)
358 #define GST_PAD_ACTIVATE_MODE(pad) (GST_PAD_CAST(pad)->mode)
360 #define GST_PAD_ACTIVATEFUNC(pad) (GST_PAD_CAST(pad)->activatefunc)
361 #define GST_PAD_ACTIVATEPUSHFUNC(pad) (GST_PAD_CAST(pad)->activatepushfunc)
362 #define GST_PAD_ACTIVATEPULLFUNC(pad) (GST_PAD_CAST(pad)->activatepullfunc)
363 #define GST_PAD_CHAINFUNC(pad) (GST_PAD_CAST(pad)->chainfunc)
364 #define GST_PAD_CHECKGETRANGEFUNC(pad) (GST_PAD_CAST(pad)->checkgetrangefunc)
365 #define GST_PAD_GETRANGEFUNC(pad) (GST_PAD_CAST(pad)->getrangefunc)
366 #define GST_PAD_EVENTFUNC(pad) (GST_PAD_CAST(pad)->eventfunc)
367 #define GST_PAD_QUERYTYPEFUNC(pad) (GST_PAD_CAST(pad)->querytypefunc)
368 #define GST_PAD_QUERYFUNC(pad) (GST_PAD_CAST(pad)->queryfunc)
369 #define GST_PAD_INTLINKFUNC(pad) (GST_PAD_CAST(pad)->intlinkfunc)
371 #define GST_PAD_PEER(pad) (GST_PAD_CAST(pad)->peer)
372 #define GST_PAD_LINKFUNC(pad) (GST_PAD_CAST(pad)->linkfunc)
373 #define GST_PAD_UNLINKFUNC(pad) (GST_PAD_CAST(pad)->unlinkfunc)
375 #define GST_PAD_CAPS(pad) (GST_PAD_CAST(pad)->caps)
376 #define GST_PAD_GETCAPSFUNC(pad) (GST_PAD_CAST(pad)->getcapsfunc)
377 #define GST_PAD_SETCAPSFUNC(pad) (GST_PAD_CAST(pad)->setcapsfunc)
378 #define GST_PAD_ACCEPTCAPSFUNC(pad) (GST_PAD_CAST(pad)->acceptcapsfunc)
379 #define GST_PAD_FIXATECAPSFUNC(pad) (GST_PAD_CAST(pad)->fixatecapsfunc)
381 #define GST_PAD_BUFFERALLOCFUNC(pad) (GST_PAD_CAST(pad)->bufferallocfunc)
383 #define GST_PAD_DO_BUFFER_SIGNALS(pad) (GST_PAD_CAST(pad)->do_buffer_signals)
384 #define GST_PAD_DO_EVENT_SIGNALS(pad) (GST_PAD_CAST(pad)->do_event_signals)
386 #define GST_PAD_IS_LINKED(pad) (GST_PAD_PEER(pad) != NULL)
387 #define GST_PAD_IS_BLOCKED(pad) (GST_FLAG_IS_SET (pad, GST_PAD_BLOCKED))
388 #define GST_PAD_IS_FLUSHING(pad) (GST_FLAG_IS_SET (pad, GST_PAD_FLUSHING))
389 #define GST_PAD_IS_IN_GETCAPS(pad) (GST_FLAG_IS_SET (pad, GST_PAD_IN_GETCAPS))
390 #define GST_PAD_IS_IN_SETCAPS(pad) (GST_FLAG_IS_SET (pad, GST_PAD_IN_SETCAPS))
391 #define GST_PAD_IS_USABLE(pad) (GST_PAD_IS_LINKED (pad) && \
392 !GST_PAD_IS_FLUSHING(pad) && !GST_PAD_IS_FLUSHING(GST_PAD_PEER (pad)))
393 #define GST_PAD_IS_SRC(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SRC)
394 #define GST_PAD_IS_SINK(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SINK)
396 #define GST_PAD_SET_FLUSHING(pad) (GST_FLAG_SET (pad, GST_PAD_FLUSHING))
397 #define GST_PAD_UNSET_FLUSHING(pad) (GST_FLAG_UNSET (pad, GST_PAD_FLUSHING))
399 #define GST_STREAM_GET_LOCK(pad) (GST_PAD_CAST(pad)->stream_rec_lock)
400 #define GST_STREAM_LOCK(pad) (g_static_rec_mutex_lock(GST_STREAM_GET_LOCK(pad)))
401 #define GST_STREAM_TRYLOCK(pad) (g_static_rec_mutex_trylock(GST_STREAM_GET_LOCK(pad)))
402 #define GST_STREAM_UNLOCK(pad) (g_static_rec_mutex_unlock(GST_STREAM_GET_LOCK(pad)))
403 #define GST_STREAM_UNLOCK_FULL(pad) (g_static_rec_mutex_unlock_full(GST_STREAM_GET_LOCK(pad)))
404 #define GST_STREAM_LOCK_FULL(pad,t) (g_static_rec_mutex_lock_full(GST_STREAM_GET_LOCK(pad), t))
406 #define GST_PREROLL_GET_LOCK(pad) (GST_PAD_CAST(pad)->preroll_lock)
407 #define GST_PREROLL_LOCK(pad) (g_mutex_lock(GST_PREROLL_GET_LOCK(pad)))
408 #define GST_PREROLL_TRYLOCK(pad) (g_mutex_trylock(GST_PREROLL_GET_LOCK(pad)))
409 #define GST_PREROLL_UNLOCK(pad) (g_mutex_unlock(GST_PREROLL_GET_LOCK(pad)))
410 #define GST_PREROLL_GET_COND(pad) (GST_PAD_CAST(pad)->preroll_cond)
411 #define GST_PREROLL_WAIT(pad) g_cond_wait (GST_PREROLL_GET_COND (pad), GST_PREROLL_GET_LOCK (pad))
412 #define GST_PREROLL_TIMED_WAIT(pad, timeval) g_cond_timed_wait (GST_PREROLL_GET_COND (pad), GST_PREROLL_GET_LOCK (pad),\
414 #define GST_PREROLL_SIGNAL(pad) g_cond_signal (GST_PREROLL_GET_COND (pad));
415 #define GST_PREROLL_BROADCAST(pad) g_cond_broadcast (GST_PREROLL_GET_COND (pad));
417 #define GST_PAD_BLOCK_GET_COND(pad) (GST_PAD_CAST(pad)->block_cond)
418 #define GST_PAD_BLOCK_WAIT(pad) (g_cond_wait(GST_PAD_BLOCK_GET_COND (pad), GST_GET_LOCK (pad)))
419 #define GST_PAD_BLOCK_SIGNAL(pad) (g_cond_signal(GST_PAD_BLOCK_GET_COND (pad)))
421 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
422 #include <gst/gstpadtemplate.h>
424 GType gst_pad_get_type (void);
427 GstPad* gst_pad_new (const gchar *name, GstPadDirection direction);
428 GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name);
430 #define gst_pad_get_name(pad) gst_object_get_name (GST_OBJECT_CAST (pad))
431 #define gst_pad_get_parent(pad) gst_object_get_parent (GST_OBJECT_CAST (pad))
433 GstPadDirection gst_pad_get_direction (GstPad *pad);
435 gboolean gst_pad_set_active (GstPad *pad, gboolean active);
436 gboolean gst_pad_is_active (GstPad *pad);
437 gboolean gst_pad_activate_pull (GstPad *pad, gboolean active);
438 gboolean gst_pad_activate_push (GstPad *pad, gboolean active);
440 gboolean gst_pad_set_blocked (GstPad *pad, gboolean blocked);
441 gboolean gst_pad_set_blocked_async (GstPad *pad, gboolean blocked,
442 GstPadBlockCallback callback, gpointer user_data);
443 gboolean gst_pad_is_blocked (GstPad *pad);
445 void gst_pad_set_element_private (GstPad *pad, gpointer priv);
446 gpointer gst_pad_get_element_private (GstPad *pad);
448 GstPadTemplate* gst_pad_get_pad_template (GstPad *pad);
450 void gst_pad_set_bufferalloc_function (GstPad *pad, GstPadBufferAllocFunction bufalloc);
451 GstFlowReturn gst_pad_alloc_buffer (GstPad *pad, guint64 offset, gint size,
452 GstCaps *caps, GstBuffer **buf);
454 /* data passing setup functions */
455 void gst_pad_set_activate_function (GstPad *pad, GstPadActivateFunction activate);
456 void gst_pad_set_activatepull_function (GstPad *pad, GstPadActivateModeFunction activatepull);
457 void gst_pad_set_activatepush_function (GstPad *pad, GstPadActivateModeFunction activatepush);
458 void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain);
459 void gst_pad_set_getrange_function (GstPad *pad, GstPadGetRangeFunction get);
460 void gst_pad_set_checkgetrange_function (GstPad *pad, GstPadCheckGetRangeFunction check);
461 void gst_pad_set_event_function (GstPad *pad, GstPadEventFunction event);
464 void gst_pad_set_link_function (GstPad *pad, GstPadLinkFunction link);
465 void gst_pad_set_unlink_function (GstPad *pad, GstPadUnlinkFunction unlink);
467 GstPadLinkReturn gst_pad_link (GstPad *srcpad, GstPad *sinkpad);
468 gboolean gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad);
469 gboolean gst_pad_is_linked (GstPad *pad);
471 GstPad* gst_pad_get_peer (GstPad *pad);
473 /* capsnego functions */
474 void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps);
475 void gst_pad_set_acceptcaps_function (GstPad *pad, GstPadAcceptCapsFunction acceptcaps);
476 void gst_pad_set_fixatecaps_function (GstPad *pad, GstPadFixateCapsFunction fixatecaps);
477 void gst_pad_set_setcaps_function (GstPad *pad, GstPadSetCapsFunction setcaps);
479 G_CONST_RETURN GstCaps* gst_pad_get_pad_template_caps (GstPad *pad);
481 /* capsnego function for connected/unconnected pads */
482 GstCaps * gst_pad_get_caps (GstPad * pad);
483 void gst_pad_fixate_caps (GstPad * pad, GstCaps *caps);
484 gboolean gst_pad_accept_caps (GstPad * pad, GstCaps *caps);
485 gboolean gst_pad_set_caps (GstPad * pad, GstCaps *caps);
487 GstCaps * gst_pad_peer_get_caps (GstPad * pad);
488 gboolean gst_pad_peer_accept_caps (GstPad * pad, GstCaps *caps);
490 /* capsnego for connected pads */
491 GstCaps * gst_pad_get_allowed_caps (GstPad * srcpad);
492 GstCaps * gst_pad_get_negotiated_caps (GstPad * pad);
494 /* data passing functions to peer */
495 GstFlowReturn gst_pad_push (GstPad *pad, GstBuffer *buffer);
496 gboolean gst_pad_check_pull_range (GstPad *pad);
497 GstFlowReturn gst_pad_pull_range (GstPad *pad, guint64 offset, guint size,
499 gboolean gst_pad_push_event (GstPad *pad, GstEvent *event);
500 gboolean gst_pad_event_default (GstPad *pad, GstEvent *event);
502 /* data passing functions on pad */
503 GstFlowReturn gst_pad_chain (GstPad *pad, GstBuffer *buffer);
504 GstFlowReturn gst_pad_get_range (GstPad *pad, guint64 offset, guint size,
506 gboolean gst_pad_send_event (GstPad *pad, GstEvent *event);
509 gboolean gst_pad_start_task (GstPad *pad, GstTaskFunction func,
511 gboolean gst_pad_pause_task (GstPad *pad);
512 gboolean gst_pad_stop_task (GstPad *pad);
515 void gst_pad_set_internal_link_function (GstPad *pad, GstPadIntLinkFunction intlink);
516 GList* gst_pad_get_internal_links (GstPad *pad);
517 GList* gst_pad_get_internal_links_default (GstPad *pad);
519 /* generic query function */
520 void gst_pad_set_query_type_function (GstPad *pad, GstPadQueryTypeFunction type_func);
521 G_CONST_RETURN GstQueryType*
522 gst_pad_get_query_types (GstPad *pad);
523 G_CONST_RETURN GstQueryType*
524 gst_pad_get_query_types_default (GstPad *pad);
526 gboolean gst_pad_query (GstPad *pad, GstQuery *query);
527 void gst_pad_set_query_function (GstPad *pad, GstPadQueryFunction query);
528 gboolean gst_pad_query_default (GstPad *pad, GstQuery *query);
530 /* misc helper functions */
531 gboolean gst_pad_dispatcher (GstPad *pad, GstPadDispatcherFunction dispatch,
534 #ifndef GST_DISABLE_LOADSAVE
535 void gst_pad_load_and_link (xmlNodePtr self, GstObject *parent);
540 #endif /* __GST_PAD_H__ */