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>
41 #define GST_TYPE_PAD (gst_pad_get_type ())
42 #define GST_IS_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD))
43 #define GST_IS_PAD_FAST(obj) (G_OBJECT_TYPE(obj) == GST_TYPE_PAD) /* necessary? */
44 #define GST_IS_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
45 #define GST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD, GstPad))
46 #define GST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD, GstPadClass))
47 #define GST_PAD_CAST(obj) ((GstPad*)(obj))
49 typedef struct _GstPad GstPad;
50 typedef struct _GstPadClass GstPadClass;
54 * @GST_PAD_LINK_OK : link succeeded
55 * @GST_PAD_LINK_WRONG_HIERARCHY: pads have no common grandparent
56 * @GST_PAD_LINK_WAS_LINKED : pad was already linked
57 * @GST_PAD_LINK_WRONG_DIRECTION: pads have wrong direction
58 * @GST_PAD_LINK_NOFORMAT : pads do not have common format
59 * @GST_PAD_LINK_NOSCHED : pads cannot cooperate in scheduling
60 * @GST_PAD_LINK_REFUSED : refused for some reason
64 GST_PAD_LINK_WRONG_HIERARCHY = -1,
65 GST_PAD_LINK_WAS_LINKED = -2,
66 GST_PAD_LINK_WRONG_DIRECTION = -3,
67 GST_PAD_LINK_NOFORMAT = -4,
68 GST_PAD_LINK_NOSCHED = -5,
69 GST_PAD_LINK_REFUSED = -6,
73 * GST_PAD_LINK_FAILED:
74 * @ret: the #GstPadLinkReturn value
76 * Macro to test if the given #GstPadLinkReturn value indicates a failed
79 #define GST_PAD_LINK_FAILED(ret) ((ret) < GST_PAD_LINK_OK)
82 * GST_PAD_LINK_SUCCESSFUL:
83 * @ret: the #GstPadLinkReturn value
85 * Macro to test if the given #GstPadLinkReturn value indicates a successful
88 #define GST_PAD_LINK_SUCCESSFUL(ret) ((ret) >= GST_PAD_LINK_OK)
92 * @GST_FLOW_RESEND: Resend buffer, possibly with new caps.
93 * @GST_FLOW_OK: Data passing was ok.
94 * @GST_FLOW_NOT_LINKED: Pad is not linked.
95 * @GST_FLOW_WRONG_STATE: Pad is in wrong state.
96 * @GST_FLOW_UNEXPECTED: Did not expect anything, like after EOS.
97 * @GST_FLOW_NOT_NEGOTIATED: Pad is not negotiated.
98 * @GST_FLOW_ERROR: Some (fatal) error occured.
100 * The result of passing data to a linked pad.
105 /* expected failures */
106 GST_FLOW_NOT_LINKED = -1,
107 GST_FLOW_WRONG_STATE = -2,
109 GST_FLOW_UNEXPECTED = -3,
110 GST_FLOW_NOT_NEGOTIATED = -4,
112 GST_FLOW_NOT_SUPPORTED = -6
117 * @ret: a #GstFlowReturn value
119 * Macro to test if the given #GstFlowReturn value indicates a fatal
122 #define GST_FLOW_IS_FATAL(ret) ((ret) <= GST_FLOW_UNEXPECTED)
124 G_CONST_RETURN gchar* gst_flow_get_name (GstFlowReturn ret);
125 GQuark gst_flow_to_quark (GstFlowReturn ret);
133 #define GST_PAD_MODE_ACTIVATE(mode) ((mode) != GST_ACTIVATE_NONE)
136 typedef gboolean (*GstPadActivateFunction) (GstPad *pad);
137 typedef gboolean (*GstPadActivateModeFunction) (GstPad *pad, gboolean active);
142 * GstPadChainFunction:
143 * @pad: the #GstPad that performed the chain.
144 * @buffer: the #GstBuffer that is chained.
146 * A function that will be called when chaining buffers.
148 * Returns: GST_FLOW_OK for success
150 typedef GstFlowReturn (*GstPadChainFunction) (GstPad *pad, GstBuffer *buffer);
151 typedef GstFlowReturn (*GstPadGetRangeFunction) (GstPad *pad, guint64 offset,
152 guint length, GstBuffer **buffer);
155 * GstPadEventFunction:
156 * @pad: the #GstPad to handle the event.
157 * @event: the #GstEvent to handle.
159 * Function signature to handle an event for the pad.
161 * Returns: TRUE if the pad could handle the event.
163 typedef gboolean (*GstPadEventFunction) (GstPad *pad, GstEvent *event);
166 /* deprecate me, check range should use seeking query */
167 typedef gboolean (*GstPadCheckGetRangeFunction) (GstPad *pad);
172 * GstPadIntLinkFunction:
173 * @pad: The #GstPad to query.
175 * The signature of the internal pad link function.
177 * Returns: a newly allocated #GList of pads that are linked to the given pad on
178 * the inside of the parent element.
179 * The caller must call g_list_free() on it after use.
182 typedef GList* (*GstPadIntLinkFunction) (GstPad *pad);
185 /* generic query function */
187 * GstPadQueryTypeFunction:
188 * @pad: a #GstPad to query
190 * The signature of the query types function.
192 * Returns: an array of query types
194 typedef const GstQueryType* (*GstPadQueryTypeFunction) (GstPad *pad);
197 * GstPadQueryFunction:
198 * @pad: the #GstPad to query.
199 * @query: the #GstQuery object to execute
201 * The signature of the query function.
203 * Returns: TRUE if the query could be performed.
205 typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstQuery *query);
211 * @pad: the #GstPad that is linked.
212 * @peer: the peer #GstPad of the link
214 * Function signature to handle a new link on the pad.
216 * Returns: the result of the link with the specified peer.
218 typedef GstPadLinkReturn (*GstPadLinkFunction) (GstPad *pad, GstPad *peer);
220 * GstPadUnlinkFunction
221 * @pad: the #GstPad that is linked.
223 * Function signature to handle a unlinking the pad prom its peer.
225 typedef void (*GstPadUnlinkFunction) (GstPad *pad);
230 * GstPadGetCapsFunction:
231 * @pad: the #GstPad to get the capabilities of.
233 * Returns a copy of the capabilities of the specified pad. By default this
234 * function will return the pad template capabilities, but can optionally
237 * Returns: a newly allocated copy #GstCaps of the pad.
239 typedef GstCaps* (*GstPadGetCapsFunction) (GstPad *pad);
240 typedef gboolean (*GstPadSetCapsFunction) (GstPad *pad, GstCaps *caps);
241 typedef gboolean (*GstPadAcceptCapsFunction) (GstPad *pad, GstCaps *caps);
242 typedef void (*GstPadFixateCapsFunction) (GstPad *pad, GstCaps *caps);
243 typedef GstFlowReturn (*GstPadBufferAllocFunction) (GstPad *pad, guint64 offset, guint size,
244 GstCaps *caps, GstBuffer **buf);
248 * GstPadDispatcherFunction:
249 * @pad: the #GstPad that is dispatched.
250 * @data: the gpointer to optional user data.
252 * A dispatcher function is called for all internally linked pads, see
253 * gst_pad_dispatcher().
255 * Returns: TRUE if the dispatching procedure has to be stopped.
257 typedef gboolean (*GstPadDispatcherFunction) (GstPad *pad, gpointer data);
260 * GstPadBlockCallback:
261 * @pad: the #GstPad that is blockend or unblocked.
262 * @blocked: blocking state for the pad
263 * @user_data: the gpointer to optional user data.
265 * Callback used by gst_pad_set_blocked_async(). Gets called when the blocking
266 * operation succeeds.
269 typedef void (*GstPadBlockCallback) (GstPad *pad, gboolean blocked, gpointer user_data);
273 * @GST_PAD_UNKNOWN: direction is unknown.
274 * @GST_PAD_SRC: the pad is a source pad.
275 * @GST_PAD_SINK: the pad is a sink pad.
277 * The direction of a pad.
287 * @GST_PAD_BLOCKED: is dataflow on a pad blocked
288 * @GST_PAD_FLUSHING: is pad empying buffers
289 * @GST_PAD_IN_GETCAPS: GstPadGetCapsFunction() is running now
290 * @GST_PAD_IN_SETCAPS: GstPadSetCapsFunction() is running now
291 * @GST_PAD_FLAG_LAST: offset to define more flags
296 GST_PAD_BLOCKED = (GST_OBJECT_FLAG_LAST << 0),
297 GST_PAD_FLUSHING = (GST_OBJECT_FLAG_LAST << 1),
298 GST_PAD_IN_GETCAPS = (GST_OBJECT_FLAG_LAST << 2),
299 GST_PAD_IN_SETCAPS = (GST_OBJECT_FLAG_LAST << 3),
301 GST_PAD_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 8)
304 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
305 typedef struct _GstPadTemplate GstPadTemplate;
310 gpointer element_private;
312 GstPadTemplate *padtemplate;
314 /* direction cannot change after creating the pad */
315 GstPadDirection direction;
317 /*< public >*/ /* with STREAM_LOCK */
318 /* streaming rec_lock */
319 GStaticRecMutex *stream_rec_lock;
321 /*< public >*/ /* with PREROLL_LOCK */
322 GMutex *preroll_lock;
325 /*< public >*/ /* with LOCK */
326 /* block cond, mutex is from the object */
328 GstPadBlockCallback block_callback;
331 /* the pad capabilities */
333 GstPadGetCapsFunction getcapsfunc;
334 GstPadSetCapsFunction setcapsfunc;
335 GstPadAcceptCapsFunction acceptcapsfunc;
336 GstPadFixateCapsFunction fixatecapsfunc;
338 GstPadActivateFunction activatefunc;
339 GstPadActivateModeFunction activatepushfunc;
340 GstPadActivateModeFunction activatepullfunc;
343 GstPadLinkFunction linkfunc;
344 GstPadUnlinkFunction unlinkfunc;
347 gpointer sched_private;
349 /* data transport functions */
350 GstPadChainFunction chainfunc;
351 GstPadCheckGetRangeFunction checkgetrangefunc;
352 GstPadGetRangeFunction getrangefunc;
353 GstPadEventFunction eventfunc;
355 GstActivateMode mode;
357 /* generic query method */
358 GstPadQueryTypeFunction querytypefunc;
359 GstPadQueryFunction queryfunc;
362 GstPadIntLinkFunction intlinkfunc;
364 GstPadBufferAllocFunction bufferallocfunc;
366 /* whether to emit signals for have-data. counts number
367 * of handlers attached. */
368 gint do_buffer_signals;
369 gint do_event_signals;
372 gpointer _gst_reserved[GST_PADDING];
375 struct _GstPadClass {
376 GstObjectClass parent_class;
378 /* signal callbacks */
379 void (*linked) (GstPad *pad, GstPad *peer);
380 void (*unlinked) (GstPad *pad, GstPad *peer);
381 void (*request_link) (GstPad *pad);
382 gboolean (*have_data) (GstPad *pad, GstMiniObject *data);
385 gpointer _gst_reserved[GST_PADDING];
389 /***** helper macros *****/
391 #define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
392 #define GST_PAD_PARENT(pad) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(pad)))
393 #define GST_PAD_ELEMENT_PRIVATE(pad) (GST_PAD_CAST(pad)->element_private)
394 #define GST_PAD_PAD_TEMPLATE(pad) (GST_PAD_CAST(pad)->padtemplate)
395 #define GST_PAD_DIRECTION(pad) (GST_PAD_CAST(pad)->direction)
396 #define GST_PAD_TASK(pad) (GST_PAD_CAST(pad)->task)
397 #define GST_PAD_ACTIVATE_MODE(pad) (GST_PAD_CAST(pad)->mode)
399 #define GST_PAD_ACTIVATEFUNC(pad) (GST_PAD_CAST(pad)->activatefunc)
400 #define GST_PAD_ACTIVATEPUSHFUNC(pad) (GST_PAD_CAST(pad)->activatepushfunc)
401 #define GST_PAD_ACTIVATEPULLFUNC(pad) (GST_PAD_CAST(pad)->activatepullfunc)
402 #define GST_PAD_CHAINFUNC(pad) (GST_PAD_CAST(pad)->chainfunc)
403 #define GST_PAD_CHECKGETRANGEFUNC(pad) (GST_PAD_CAST(pad)->checkgetrangefunc)
404 #define GST_PAD_GETRANGEFUNC(pad) (GST_PAD_CAST(pad)->getrangefunc)
405 #define GST_PAD_EVENTFUNC(pad) (GST_PAD_CAST(pad)->eventfunc)
406 #define GST_PAD_QUERYTYPEFUNC(pad) (GST_PAD_CAST(pad)->querytypefunc)
407 #define GST_PAD_QUERYFUNC(pad) (GST_PAD_CAST(pad)->queryfunc)
408 #define GST_PAD_INTLINKFUNC(pad) (GST_PAD_CAST(pad)->intlinkfunc)
410 #define GST_PAD_PEER(pad) (GST_PAD_CAST(pad)->peer)
411 #define GST_PAD_LINKFUNC(pad) (GST_PAD_CAST(pad)->linkfunc)
412 #define GST_PAD_UNLINKFUNC(pad) (GST_PAD_CAST(pad)->unlinkfunc)
414 #define GST_PAD_CAPS(pad) (GST_PAD_CAST(pad)->caps)
415 #define GST_PAD_GETCAPSFUNC(pad) (GST_PAD_CAST(pad)->getcapsfunc)
416 #define GST_PAD_SETCAPSFUNC(pad) (GST_PAD_CAST(pad)->setcapsfunc)
417 #define GST_PAD_ACCEPTCAPSFUNC(pad) (GST_PAD_CAST(pad)->acceptcapsfunc)
418 #define GST_PAD_FIXATECAPSFUNC(pad) (GST_PAD_CAST(pad)->fixatecapsfunc)
420 #define GST_PAD_BUFFERALLOCFUNC(pad) (GST_PAD_CAST(pad)->bufferallocfunc)
422 #define GST_PAD_DO_BUFFER_SIGNALS(pad) (GST_PAD_CAST(pad)->do_buffer_signals)
423 #define GST_PAD_DO_EVENT_SIGNALS(pad) (GST_PAD_CAST(pad)->do_event_signals)
425 #define GST_PAD_IS_LINKED(pad) (GST_PAD_PEER(pad) != NULL)
426 #define GST_PAD_IS_BLOCKED(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_BLOCKED))
427 #define GST_PAD_IS_FLUSHING(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLUSHING))
428 #define GST_PAD_IS_IN_GETCAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_IN_GETCAPS))
429 #define GST_PAD_IS_IN_SETCAPS(pad) (GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_IN_SETCAPS))
430 #define GST_PAD_IS_USABLE(pad) (GST_PAD_IS_LINKED (pad) && \
431 !GST_PAD_IS_FLUSHING(pad) && !GST_PAD_IS_FLUSHING(GST_PAD_PEER (pad)))
432 #define GST_PAD_IS_SRC(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SRC)
433 #define GST_PAD_IS_SINK(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SINK)
435 #define GST_PAD_SET_FLUSHING(pad) (GST_OBJECT_FLAG_SET (pad, GST_PAD_FLUSHING))
436 #define GST_PAD_UNSET_FLUSHING(pad) (GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLUSHING))
438 #define GST_STREAM_GET_LOCK(pad) (GST_PAD_CAST(pad)->stream_rec_lock)
439 #define GST_STREAM_LOCK(pad) (g_static_rec_mutex_lock(GST_STREAM_GET_LOCK(pad)))
440 #define GST_STREAM_TRYLOCK(pad) (g_static_rec_mutex_trylock(GST_STREAM_GET_LOCK(pad)))
441 #define GST_STREAM_UNLOCK(pad) (g_static_rec_mutex_unlock(GST_STREAM_GET_LOCK(pad)))
442 #define GST_STREAM_UNLOCK_FULL(pad) (g_static_rec_mutex_unlock_full(GST_STREAM_GET_LOCK(pad)))
443 #define GST_STREAM_LOCK_FULL(pad,t) (g_static_rec_mutex_lock_full(GST_STREAM_GET_LOCK(pad), t))
445 #define GST_PREROLL_GET_LOCK(pad) (GST_PAD_CAST(pad)->preroll_lock)
446 #define GST_PREROLL_LOCK(pad) (g_mutex_lock(GST_PREROLL_GET_LOCK(pad)))
447 #define GST_PREROLL_TRYLOCK(pad) (g_mutex_trylock(GST_PREROLL_GET_LOCK(pad)))
448 #define GST_PREROLL_UNLOCK(pad) (g_mutex_unlock(GST_PREROLL_GET_LOCK(pad)))
449 #define GST_PREROLL_GET_COND(pad) (GST_PAD_CAST(pad)->preroll_cond)
450 #define GST_PREROLL_WAIT(pad) g_cond_wait (GST_PREROLL_GET_COND (pad), GST_PREROLL_GET_LOCK (pad))
451 #define GST_PREROLL_TIMED_WAIT(pad, timeval) g_cond_timed_wait (GST_PREROLL_GET_COND (pad), GST_PREROLL_GET_LOCK (pad),\
453 #define GST_PREROLL_SIGNAL(pad) g_cond_signal (GST_PREROLL_GET_COND (pad));
454 #define GST_PREROLL_BROADCAST(pad) g_cond_broadcast (GST_PREROLL_GET_COND (pad));
456 #define GST_PAD_BLOCK_GET_COND(pad) (GST_PAD_CAST(pad)->block_cond)
457 #define GST_PAD_BLOCK_WAIT(pad) (g_cond_wait(GST_PAD_BLOCK_GET_COND (pad), GST_GET_LOCK (pad)))
458 #define GST_PAD_BLOCK_SIGNAL(pad) (g_cond_signal(GST_PAD_BLOCK_GET_COND (pad)))
460 /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
461 #include <gst/gstpadtemplate.h>
463 GType gst_pad_get_type (void);
466 GstPad* gst_pad_new (const gchar *name, GstPadDirection direction);
467 GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name);
471 * @pad: the pad to get the name from
473 * Returns a copy of the name of the pad.
475 * Returns: the name of the pad. g_free() after usage.
479 #define gst_pad_get_name(pad) gst_object_get_name (GST_OBJECT_CAST (pad))
481 * gst_pad_get_parent:
482 * @pad: the pad to get the parent of
484 * Returns the parent of @pad. This function increases the refcount
485 * of the parent object so you should gst_object_unref() it after usage.
487 * Returns: parent of the object, this can be NULL if the pad has no
488 * parent. unref after usage.
492 #define gst_pad_get_parent(pad) gst_object_get_parent (GST_OBJECT_CAST (pad))
494 GstPadDirection gst_pad_get_direction (GstPad *pad);
496 gboolean gst_pad_set_active (GstPad *pad, gboolean active);
497 gboolean gst_pad_is_active (GstPad *pad);
498 gboolean gst_pad_activate_pull (GstPad *pad, gboolean active);
499 gboolean gst_pad_activate_push (GstPad *pad, gboolean active);
501 gboolean gst_pad_set_blocked (GstPad *pad, gboolean blocked);
502 gboolean gst_pad_set_blocked_async (GstPad *pad, gboolean blocked,
503 GstPadBlockCallback callback, gpointer user_data);
504 gboolean gst_pad_is_blocked (GstPad *pad);
506 void gst_pad_set_element_private (GstPad *pad, gpointer priv);
507 gpointer gst_pad_get_element_private (GstPad *pad);
509 GstPadTemplate* gst_pad_get_pad_template (GstPad *pad);
511 void gst_pad_set_bufferalloc_function (GstPad *pad, GstPadBufferAllocFunction bufalloc);
512 GstFlowReturn gst_pad_alloc_buffer (GstPad *pad, guint64 offset, gint size,
513 GstCaps *caps, GstBuffer **buf);
515 /* data passing setup functions */
516 void gst_pad_set_activate_function (GstPad *pad, GstPadActivateFunction activate);
517 void gst_pad_set_activatepull_function (GstPad *pad, GstPadActivateModeFunction activatepull);
518 void gst_pad_set_activatepush_function (GstPad *pad, GstPadActivateModeFunction activatepush);
519 void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain);
520 void gst_pad_set_getrange_function (GstPad *pad, GstPadGetRangeFunction get);
521 void gst_pad_set_checkgetrange_function (GstPad *pad, GstPadCheckGetRangeFunction check);
522 void gst_pad_set_event_function (GstPad *pad, GstPadEventFunction event);
525 void gst_pad_set_link_function (GstPad *pad, GstPadLinkFunction link);
526 void gst_pad_set_unlink_function (GstPad *pad, GstPadUnlinkFunction unlink);
528 GstPadLinkReturn gst_pad_link (GstPad *srcpad, GstPad *sinkpad);
529 gboolean gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad);
530 gboolean gst_pad_is_linked (GstPad *pad);
532 GstPad* gst_pad_get_peer (GstPad *pad);
534 /* capsnego functions */
535 void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps);
536 void gst_pad_set_acceptcaps_function (GstPad *pad, GstPadAcceptCapsFunction acceptcaps);
537 void gst_pad_set_fixatecaps_function (GstPad *pad, GstPadFixateCapsFunction fixatecaps);
538 void gst_pad_set_setcaps_function (GstPad *pad, GstPadSetCapsFunction setcaps);
540 G_CONST_RETURN GstCaps* gst_pad_get_pad_template_caps (GstPad *pad);
542 /* capsnego function for connected/unconnected pads */
543 GstCaps * gst_pad_get_caps (GstPad * pad);
544 void gst_pad_fixate_caps (GstPad * pad, GstCaps *caps);
545 gboolean gst_pad_accept_caps (GstPad * pad, GstCaps *caps);
546 gboolean gst_pad_set_caps (GstPad * pad, GstCaps *caps);
548 GstCaps * gst_pad_peer_get_caps (GstPad * pad);
549 gboolean gst_pad_peer_accept_caps (GstPad * pad, GstCaps *caps);
551 /* capsnego for connected pads */
552 GstCaps * gst_pad_get_allowed_caps (GstPad * srcpad);
553 GstCaps * gst_pad_get_negotiated_caps (GstPad * pad);
555 /* data passing functions to peer */
556 GstFlowReturn gst_pad_push (GstPad *pad, GstBuffer *buffer);
557 gboolean gst_pad_check_pull_range (GstPad *pad);
558 GstFlowReturn gst_pad_pull_range (GstPad *pad, guint64 offset, guint size,
560 gboolean gst_pad_push_event (GstPad *pad, GstEvent *event);
561 gboolean gst_pad_event_default (GstPad *pad, GstEvent *event);
563 /* data passing functions on pad */
564 GstFlowReturn gst_pad_chain (GstPad *pad, GstBuffer *buffer);
565 GstFlowReturn gst_pad_get_range (GstPad *pad, guint64 offset, guint size,
567 gboolean gst_pad_send_event (GstPad *pad, GstEvent *event);
570 gboolean gst_pad_start_task (GstPad *pad, GstTaskFunction func,
572 gboolean gst_pad_pause_task (GstPad *pad);
573 gboolean gst_pad_stop_task (GstPad *pad);
576 void gst_pad_set_internal_link_function (GstPad *pad, GstPadIntLinkFunction intlink);
577 GList* gst_pad_get_internal_links (GstPad *pad);
578 GList* gst_pad_get_internal_links_default (GstPad *pad);
580 /* generic query function */
581 void gst_pad_set_query_type_function (GstPad *pad, GstPadQueryTypeFunction type_func);
582 G_CONST_RETURN GstQueryType*
583 gst_pad_get_query_types (GstPad *pad);
584 G_CONST_RETURN GstQueryType*
585 gst_pad_get_query_types_default (GstPad *pad);
587 gboolean gst_pad_query (GstPad *pad, GstQuery *query);
588 void gst_pad_set_query_function (GstPad *pad, GstPadQueryFunction query);
589 gboolean gst_pad_query_default (GstPad *pad, GstQuery *query);
591 /* misc helper functions */
592 gboolean gst_pad_dispatcher (GstPad *pad, GstPadDispatcherFunction dispatch,
595 #ifndef GST_DISABLE_LOADSAVE
596 void gst_pad_load_and_link (xmlNodePtr self, GstObject *parent);
601 #endif /* __GST_PAD_H__ */