2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
5 * gstpad.c: Pads for connecting elements together
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.
23 /* #define GST_DEBUG_ENABLED */
24 #include "gst_private.h"
28 #include "gstelement.h"
31 #include "gstscheduler.h"
34 GType _gst_pad_type = 0;
36 /***** Start with the base GstPad class *****/
37 static void gst_pad_class_init (GstPadClass *klass);
38 static void gst_pad_init (GstPad *pad);
40 static gboolean gst_pad_try_reconnect_filtered_func (GstRealPad *srcpad, GstRealPad *sinkpad,
41 GstCaps *caps, gboolean clear);
43 #ifndef GST_DISABLE_LOADSAVE
44 static xmlNodePtr gst_pad_save_thyself (GstObject *object, xmlNodePtr parent);
47 static GstObject *pad_parent_class = NULL;
50 gst_pad_get_type(void)
53 static const GTypeInfo pad_info = {
57 (GClassInitFunc)gst_pad_class_init,
62 (GInstanceInitFunc)gst_pad_init,
65 _gst_pad_type = g_type_register_static(GST_TYPE_OBJECT, "GstPad", &pad_info, 0);
71 gst_pad_class_init (GstPadClass *klass)
73 pad_parent_class = g_type_class_ref(GST_TYPE_OBJECT);
77 gst_pad_init (GstPad *pad)
79 pad->element_private = NULL;
81 pad->padtemplate = NULL;
86 /***** Then do the Real Pad *****/
87 /* Pad signals and args */
91 REAL_CAPS_NEGO_FAILED,
105 static void gst_real_pad_class_init (GstRealPadClass *klass);
106 static void gst_real_pad_init (GstRealPad *pad);
108 static void gst_real_pad_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
109 static void gst_real_pad_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
111 static void gst_real_pad_dispose (GObject *object);
113 static void gst_pad_push_func (GstPad *pad, GstBuffer *buf);
115 GType _gst_real_pad_type = 0;
117 static GstPad *real_pad_parent_class = NULL;
118 static guint gst_real_pad_signals[REAL_LAST_SIGNAL] = { 0 };
121 gst_real_pad_get_type(void) {
122 if (!_gst_real_pad_type) {
123 static const GTypeInfo pad_info = {
124 sizeof(GstRealPadClass),
127 (GClassInitFunc)gst_real_pad_class_init,
132 (GInstanceInitFunc)gst_real_pad_init,
135 _gst_real_pad_type = g_type_register_static(GST_TYPE_PAD, "GstRealPad", &pad_info, 0);
137 return _gst_real_pad_type;
141 gst_real_pad_class_init (GstRealPadClass *klass)
143 GObjectClass *gobject_class;
144 GstObjectClass *gstobject_class;
146 gobject_class = (GObjectClass*) klass;
147 gstobject_class = (GstObjectClass*) klass;
149 real_pad_parent_class = g_type_class_ref (GST_TYPE_PAD);
151 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_real_pad_dispose);
152 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_real_pad_set_property);
153 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_real_pad_get_property);
155 gst_real_pad_signals[REAL_SET_ACTIVE] =
156 g_signal_new ("set_active", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
157 G_STRUCT_OFFSET (GstRealPadClass, set_active), NULL, NULL,
158 gst_marshal_VOID__BOOLEAN, G_TYPE_NONE, 1,
160 gst_real_pad_signals[REAL_CAPS_CHANGED] =
161 g_signal_new ("caps_changed", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
162 G_STRUCT_OFFSET (GstRealPadClass, caps_changed), NULL, NULL,
163 gst_marshal_VOID__POINTER, G_TYPE_NONE, 1,
165 gst_real_pad_signals[REAL_CAPS_NEGO_FAILED] =
166 g_signal_new ("caps_nego_failed", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
167 G_STRUCT_OFFSET (GstRealPadClass, caps_nego_failed), NULL, NULL,
168 gst_marshal_VOID__POINTER, G_TYPE_NONE, 1,
170 gst_real_pad_signals[REAL_CONNECTED] =
171 g_signal_new ("connected", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
172 G_STRUCT_OFFSET (GstRealPadClass, connected), NULL, NULL,
173 gst_marshal_VOID__POINTER, G_TYPE_NONE, 1,
175 gst_real_pad_signals[REAL_DISCONNECTED] =
176 g_signal_new ("disconnected", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
177 G_STRUCT_OFFSET (GstRealPadClass, disconnected), NULL, NULL,
178 gst_marshal_VOID__POINTER, G_TYPE_NONE, 1,
180 gst_real_pad_signals[REAL_EVENT_RECEIVED] =
181 g_signal_new ("event_received", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
182 G_STRUCT_OFFSET (GstRealPadClass, event_received), NULL, NULL,
183 gst_marshal_VOID__POINTER, G_TYPE_NONE, 1,
186 /* gtk_object_add_arg_type ("GstRealPad::active", G_TYPE_BOOLEAN, */
187 /* GTK_ARG_READWRITE, REAL_ARG_ACTIVE); */
188 g_object_class_install_property (G_OBJECT_CLASS (klass), REAL_ARG_ACTIVE,
189 g_param_spec_boolean ("active", "Active", "Whether the pad is active.",
190 TRUE,G_PARAM_READWRITE));
192 #ifndef GST_DISABLE_LOADSAVE
193 gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_pad_save_thyself);
195 gstobject_class->path_string_separator = ".";
199 gst_real_pad_init (GstRealPad *pad)
201 pad->direction = GST_PAD_UNKNOWN;
205 pad->sched_private = NULL;
207 pad->chainfunc = NULL;
209 pad->getregionfunc = NULL;
211 pad->chainhandler = GST_DEBUG_FUNCPTR (gst_pad_push_func);
212 pad->gethandler = NULL;
213 pad->pullregionfunc = NULL;
215 pad->bufferpoolfunc = NULL;
216 pad->ghostpads = NULL;
219 pad->connectfunc = NULL;
220 pad->getcapsfunc = NULL;
224 gst_real_pad_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
226 g_return_if_fail (GST_IS_PAD (object));
229 case REAL_ARG_ACTIVE:
230 if (g_value_get_boolean (value)) {
231 GST_DEBUG (GST_CAT_PADS, "activating pad %s:%s", GST_DEBUG_PAD_NAME (object));
232 GST_FLAG_UNSET (object, GST_PAD_DISABLED);
234 GST_DEBUG (GST_CAT_PADS, "de-activating pad %s:%s", GST_DEBUG_PAD_NAME (object));
235 GST_FLAG_SET (object, GST_PAD_DISABLED);
237 g_signal_emit (G_OBJECT (object), gst_real_pad_signals[REAL_SET_ACTIVE], 0,
238 !GST_FLAG_IS_SET (object, GST_PAD_DISABLED));
246 gst_real_pad_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
248 /* it's not null if we got it, but it might not be ours */
249 g_return_if_fail (GST_IS_PAD (object));
252 case REAL_ARG_ACTIVE:
253 g_value_set_boolean (value, !GST_FLAG_IS_SET (object, GST_PAD_DISABLED));
263 * @name: name of new pad
264 * @direction: either GST_PAD_SRC or GST_PAD_SINK
266 * Create a new pad with given name.
271 gst_pad_new (gchar *name,
272 GstPadDirection direction)
276 g_return_val_if_fail (name != NULL, NULL);
277 g_return_val_if_fail (direction != GST_PAD_UNKNOWN, NULL);
279 pad = g_object_new (gst_real_pad_get_type (), NULL);
280 gst_object_set_name (GST_OBJECT (pad), name);
281 GST_RPAD_DIRECTION (pad) = direction;
283 return GST_PAD (pad);
287 * gst_pad_new_from_template:
288 * @templ: the pad template to use
289 * @name: the name of the element
291 * Create a new pad with given name from the given template.
296 gst_pad_new_from_template (GstPadTemplate *templ,
301 g_return_val_if_fail (name != NULL, NULL);
302 g_return_val_if_fail (templ != NULL, NULL);
304 pad = gst_pad_new (name, templ->direction);
306 gst_object_ref (GST_OBJECT (templ));
307 GST_PAD_PAD_TEMPLATE (pad) = templ;
313 * gst_pad_get_direction:
314 * @pad: the Pad to get the direction from
316 * Get the direction of the pad.
318 * Returns: the direction of the pad
321 gst_pad_get_direction (GstPad *pad)
323 g_return_val_if_fail (pad != NULL, GST_PAD_UNKNOWN);
324 g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_UNKNOWN);
326 return GST_PAD_DIRECTION (pad);
331 * @pad: the pad to set the name of
332 * @name: the name of the pad
334 * Set the name of a pad.
337 gst_pad_set_name (GstPad *pad,
340 g_return_if_fail (pad != NULL);
341 g_return_if_fail (GST_IS_PAD (pad));
343 gst_object_set_name (GST_OBJECT (pad), name);
348 * @pad: the pad to get the name of
350 * Get the name of a pad.
352 * Returns: the name of the pad, don't free.
355 gst_pad_get_name (GstPad *pad)
357 g_return_val_if_fail (pad != NULL, NULL);
358 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
360 return GST_OBJECT_NAME (pad);
364 * gst_pad_set_chain_function:
365 * @pad: the pad to set the chain function for
366 * @chain: the chain function
368 * Set the given chain function for the pad.
371 gst_pad_set_chain_function (GstPad *pad,
372 GstPadChainFunction chain)
374 g_return_if_fail (pad != NULL);
375 g_return_if_fail (GST_IS_REAL_PAD (pad));
377 GST_RPAD_CHAINFUNC(pad) = chain;
378 GST_DEBUG (GST_CAT_PADS, "chainfunc for %s:%s set to %s",
379 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (chain));
383 * gst_pad_set_get_function:
384 * @pad: the pad to set the get function for
385 * @get: the get function
387 * Set the given get function for the pad.
390 gst_pad_set_get_function (GstPad *pad,
391 GstPadGetFunction get)
393 g_return_if_fail (pad != NULL);
394 g_return_if_fail (GST_IS_REAL_PAD (pad));
396 GST_RPAD_GETFUNC(pad) = get;
397 GST_DEBUG (GST_CAT_PADS, "getfunc for %s:%s set to %s",
398 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (get));
402 * gst_pad_set_event_function:
403 * @pad: the pad to set the event handler for
404 * @event: the event handler
406 * Set the given event handler for the pad.
409 gst_pad_set_event_function (GstPad *pad,
410 GstPadEventFunction event)
412 g_return_if_fail (pad != NULL);
413 g_return_if_fail (GST_IS_REAL_PAD (pad));
415 GST_RPAD_EVENTFUNC(pad) = event;
416 GST_DEBUG (GST_CAT_PADS, "eventfunc for %s:%s set to %s",
417 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (event));
421 * gst_pad_set_getregion_function:
422 * @pad: the pad to set the getregion function for
423 * @getregion: the getregion function
425 * Set the given getregion function for the pad.
428 gst_pad_set_getregion_function (GstPad *pad,
429 GstPadGetRegionFunction getregion)
431 g_return_if_fail (pad != NULL);
432 g_return_if_fail (GST_IS_REAL_PAD (pad));
434 GST_RPAD_GETREGIONFUNC(pad) = getregion;
435 GST_DEBUG (GST_CAT_PADS, "getregionfunc for %s:%s set to %s",
436 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (getregion));
440 * gst_pad_set_connect_function:
441 * @pad: the pad to set the connect function for
442 * @connect: the connect function
444 * Set the given connect function for the pad. It will be called
445 * when the pad is connected or reconnected with caps.
448 gst_pad_set_connect_function (GstPad *pad,
449 GstPadConnectFunction connect)
451 g_return_if_fail (pad != NULL);
452 g_return_if_fail (GST_IS_REAL_PAD (pad));
454 GST_RPAD_CONNECTFUNC (pad) = connect;
455 GST_DEBUG (GST_CAT_PADS, "connectfunc for %s:%s set to %s",
456 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (connect));
460 * gst_pad_set_getcaps_function:
461 * @pad: the pad to set the getcaps function for
462 * @getcaps: the getcaps function
464 * Set the given getcaps function for the pad.
467 gst_pad_set_getcaps_function (GstPad *pad,
468 GstPadGetCapsFunction getcaps)
470 g_return_if_fail (pad != NULL);
471 g_return_if_fail (GST_IS_REAL_PAD (pad));
473 GST_RPAD_GETCAPSFUNC (pad) = getcaps;
474 GST_DEBUG (GST_CAT_PADS, "getcapsfunc for %s:%s set to %s",
475 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (getcaps));
478 * gst_pad_set_bufferpool_function:
479 * @pad: the pad to set the bufferpool function for
480 * @bufpool: the bufferpool function
482 * Set the given bufferpool function for the pad.
485 gst_pad_set_bufferpool_function (GstPad *pad,
486 GstPadBufferPoolFunction bufpool)
488 g_return_if_fail (pad != NULL);
489 g_return_if_fail (GST_IS_REAL_PAD (pad));
491 GST_RPAD_BUFFERPOOLFUNC (pad) = bufpool;
492 GST_DEBUG (GST_CAT_PADS, "bufferpoolfunc for %s:%s set to %s",
493 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (bufpool));
497 gst_pad_push_func(GstPad *pad, GstBuffer *buf)
499 if (GST_RPAD_CHAINFUNC (GST_RPAD_PEER (pad)) != NULL) {
500 GST_DEBUG (GST_CAT_DATAFLOW, "calling chain function %s",
501 GST_DEBUG_FUNCPTR_NAME (GST_RPAD_CHAINFUNC (GST_RPAD_PEER (pad))));
502 (GST_RPAD_CHAINFUNC (GST_RPAD_PEER (pad))) (pad, buf);
504 GST_DEBUG (GST_CAT_DATAFLOW, "default pad_push handler in place, no chain function");
505 g_warning ("(internal error) default pad_push in place for pad %s:%s but it has no chain function",
506 GST_DEBUG_PAD_NAME (pad));
512 * gst_pad_disconnect:
513 * @srcpad: the source pad to disconnect
514 * @sinkpad: the sink pad to disconnect
516 * Disconnects the source pad from the sink pad.
519 gst_pad_disconnect (GstPad *srcpad,
522 GstRealPad *realsrc, *realsink;
525 g_return_if_fail (srcpad != NULL);
526 g_return_if_fail (GST_IS_PAD (srcpad));
527 g_return_if_fail (sinkpad != NULL);
528 g_return_if_fail (GST_IS_PAD (sinkpad));
530 GST_INFO (GST_CAT_ELEMENT_PADS, "disconnecting %s:%s(%p) and %s:%s(%p)",
531 GST_DEBUG_PAD_NAME (srcpad), srcpad, GST_DEBUG_PAD_NAME (sinkpad), sinkpad);
533 /* now we need to deal with the real/ghost stuff */
534 realsrc = GST_PAD_REALIZE (srcpad);
535 realsink = GST_PAD_REALIZE (sinkpad);
537 g_return_if_fail (GST_RPAD_PEER (realsrc) != NULL);
538 g_return_if_fail (GST_RPAD_PEER (realsink) == realsrc);
540 if ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SINK) &&
541 (GST_RPAD_DIRECTION (realsink) == GST_PAD_SRC)) {
548 g_return_if_fail ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) &&
549 (GST_RPAD_DIRECTION (realsink) == GST_PAD_SINK));
551 /* first clear peers */
552 GST_RPAD_PEER (realsrc) = NULL;
553 GST_RPAD_PEER (realsink) = NULL;
555 /* reset the filters, both filters are refcounted once */
556 if (GST_RPAD_FILTER (realsrc)) {
557 gst_caps_unref (GST_RPAD_FILTER (realsrc));
558 GST_RPAD_FILTER (realsink) = NULL;
559 GST_RPAD_FILTER (realsrc) = NULL;
562 /* now tell the scheduler */
563 if (GST_PAD_PARENT (realsrc)->sched)
564 gst_scheduler_pad_disconnect (GST_PAD_PARENT (realsrc)->sched, (GstPad *)realsrc, (GstPad *)realsink);
565 else if (GST_PAD_PARENT (realsink)->sched)
566 gst_scheduler_pad_disconnect (GST_PAD_PARENT (realsink)->sched, (GstPad *)realsrc, (GstPad *)realsink);
568 /* hold a reference, as they can go away in the signal handlers */
569 gst_object_ref (GST_OBJECT (realsrc));
570 gst_object_ref (GST_OBJECT (realsink));
572 /* fire off a signal to each of the pads telling them that they've been disconnected */
573 g_signal_emit (G_OBJECT (realsrc), gst_real_pad_signals[REAL_DISCONNECTED], 0, realsink);
574 g_signal_emit (G_OBJECT (realsink), gst_real_pad_signals[REAL_DISCONNECTED], 0, realsrc);
576 GST_INFO (GST_CAT_ELEMENT_PADS, "disconnected %s:%s and %s:%s",
577 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
579 gst_object_unref (GST_OBJECT (realsrc));
580 gst_object_unref (GST_OBJECT (realsink));
584 * gst_pad_can_connect_filtered:
585 * @srcpad: the source pad to connect
586 * @sinkpad: the sink pad to connect
587 * @filtercaps: the filter caps.
589 * Checks if the source pad and the sink pad can be connected.
590 * The filter indicates the media type that should flow trought this connection.
592 * Returns: TRUE if the pad can be connected, FALSE otherwise
595 gst_pad_can_connect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps)
597 gint num_decoupled = 0;
598 GstRealPad *realsrc, *realsink;
601 g_return_val_if_fail (srcpad != NULL, FALSE);
602 g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
603 g_return_val_if_fail (sinkpad != NULL, FALSE);
604 g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
606 /* now we need to deal with the real/ghost stuff */
607 realsrc = GST_PAD_REALIZE (srcpad);
608 realsink = GST_PAD_REALIZE (sinkpad);
610 g_return_val_if_fail (GST_RPAD_PEER (realsrc) == NULL, FALSE);
611 g_return_val_if_fail (GST_RPAD_PEER (realsink) == NULL, FALSE);
612 g_return_val_if_fail (GST_PAD_PARENT (realsrc) != NULL, FALSE);
613 g_return_val_if_fail (GST_PAD_PARENT (realsink) != NULL, FALSE);
615 if (realsrc->sched && realsink->sched) {
616 if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsrc), GST_ELEMENT_DECOUPLED))
618 if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsink), GST_ELEMENT_DECOUPLED))
621 if (realsrc->sched != realsink->sched && num_decoupled != 1) {
622 g_warning ("connecting pads with different scheds requires exactly one decoupled element (queue)");
627 /* check if the directions are compatible */
628 if (!(((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SINK) &&
629 (GST_RPAD_DIRECTION (realsink) == GST_PAD_SRC)) ||
630 ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) &&
631 (GST_RPAD_DIRECTION (realsink) == GST_PAD_SINK))))
639 * gst_pad_can_connect:
640 * @srcpad: the source pad to connect
641 * @sinkpad: the sink pad to connect
643 * Checks if the source pad can be connected to the sink pad.
645 * Returns: TRUE if the pads can be connected, FALSE otherwise
648 gst_pad_can_connect (GstPad *srcpad, GstPad *sinkpad)
650 return gst_pad_can_connect_filtered (srcpad, sinkpad, NULL);
654 * gst_pad_connect_filtered:
655 * @srcpad: the source pad to connect
656 * @sinkpad: the sink pad to connect
657 * @filtercaps: the filter caps.
659 * Connects the source pad to the sink pad. The filter indicates the media type
660 * that should flow trought this connection.
662 * Returns: TRUE if the pad could be connected, FALSE otherwise
665 gst_pad_connect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps)
667 GstRealPad *realsrc, *realsink;
668 gint num_decoupled = 0;
671 g_return_val_if_fail (srcpad != NULL, FALSE);
672 g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
673 g_return_val_if_fail (sinkpad != NULL, FALSE);
674 g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
676 GST_INFO (GST_CAT_PADS, "connecting %s:%s and %s:%s",
677 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
679 /* now we need to deal with the real/ghost stuff */
680 realsrc = GST_PAD_REALIZE (srcpad);
681 realsink = GST_PAD_REALIZE (sinkpad);
683 if ((GST_PAD (realsrc) != srcpad) || (GST_PAD (realsink) != sinkpad)) {
684 GST_INFO (GST_CAT_PADS, "*actually* connecting %s:%s and %s:%s",
685 GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
688 g_return_val_if_fail (GST_RPAD_PEER (realsrc) == NULL, FALSE);
689 g_return_val_if_fail (GST_RPAD_PEER (realsink) == NULL, FALSE);
690 g_return_val_if_fail (GST_PAD_PARENT (realsrc) != NULL, FALSE);
691 g_return_val_if_fail (GST_PAD_PARENT (realsink) != NULL, FALSE);
693 if (realsrc->sched && realsink->sched) {
694 if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsrc), GST_ELEMENT_DECOUPLED))
696 if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsink), GST_ELEMENT_DECOUPLED))
699 if (realsrc->sched != realsink->sched && num_decoupled != 1) {
700 g_warning ("connecting pads with different scheds requires exactly one decoupled element (queue)\n");
705 /* check for reversed directions and swap if necessary */
706 if ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SINK) &&
707 (GST_RPAD_DIRECTION (realsink) == GST_PAD_SRC)) {
714 g_return_val_if_fail ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) &&
715 (GST_RPAD_DIRECTION (realsink) == GST_PAD_SINK), FALSE);
717 /* first set peers */
718 GST_RPAD_PEER (realsrc) = realsink;
719 GST_RPAD_PEER (realsink) = realsrc;
721 /* try to negotiate the pads, we don't need to clear the caps here */
722 if (!gst_pad_try_reconnect_filtered_func (realsrc, realsink, filtercaps, FALSE)) {
723 GST_DEBUG (GST_CAT_CAPS, "pads cannot connect");
725 GST_RPAD_PEER (realsrc) = NULL;
726 GST_RPAD_PEER (realsink) = NULL;
731 /* fire off a signal to each of the pads telling them that they've been connected */
732 g_signal_emit (G_OBJECT (realsrc), gst_real_pad_signals[REAL_CONNECTED], 0, realsink);
733 g_signal_emit (G_OBJECT (realsink), gst_real_pad_signals[REAL_CONNECTED], 0, realsrc);
735 /* now tell the scheduler(s) */
737 gst_scheduler_pad_connect (realsrc->sched, (GstPad *)realsrc, (GstPad *)realsink);
738 else if (realsink->sched)
739 gst_scheduler_pad_connect (realsink->sched, (GstPad *)realsrc, (GstPad *)realsink);
741 GST_INFO (GST_CAT_PADS, "connected %s:%s and %s:%s",
742 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
743 gst_caps_debug (gst_pad_get_caps (GST_PAD_CAST (realsrc)), "caps of newly connected src pad");
750 * @srcpad: the source pad to connect
751 * @sinkpad: the sink pad to connect
753 * Connects the source pad to the sink pad.
755 * Returns: TRUE if the pad could be connected, FALSE otherwise
758 gst_pad_connect (GstPad *srcpad, GstPad *sinkpad)
760 return gst_pad_connect_filtered (srcpad, sinkpad, NULL);
764 * gst_pad_set_parent:
765 * @pad: the pad to set the parent
766 * @parent: the object to set the parent to
768 * Sets the parent object of a pad.
771 gst_pad_set_parent (GstPad *pad,
774 g_return_if_fail (pad != NULL);
775 g_return_if_fail (GST_IS_PAD (pad));
776 g_return_if_fail (GST_PAD_PARENT (pad) == NULL);
777 g_return_if_fail (parent != NULL);
778 g_return_if_fail (GST_IS_OBJECT (parent));
779 g_return_if_fail ((gpointer)pad != (gpointer)parent);
781 gst_object_set_parent (GST_OBJECT (pad), parent);
785 * gst_pad_get_parent:
786 * @pad: the pad to get the parent from
788 * Get the parent object of this pad.
790 * Returns: the parent object
793 gst_pad_get_parent (GstPad *pad)
795 g_return_val_if_fail (pad != NULL, NULL);
796 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
798 return GST_PAD_PARENT (pad);
802 * gst_pad_get_pad_template:
803 * @pad: the pad to get the padtemplate from
805 * Get the padtemplate object of this pad.
807 * Returns: the padtemplate object
810 gst_pad_get_pad_template (GstPad *pad)
812 g_return_val_if_fail (pad != NULL, NULL);
813 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
815 return GST_PAD_PAD_TEMPLATE (pad);
821 * @pad: the pad to set the scheduler for
822 * @sched: The scheduler to set
824 * Set the scheduler for the pad
827 gst_pad_set_sched (GstPad *pad, GstScheduler *sched)
829 g_return_if_fail (pad != NULL);
830 g_return_if_fail (GST_IS_PAD (pad));
832 GST_RPAD_SCHED(pad) = sched;
837 * @pad: the pad to get the scheduler from
839 * Get the scheduler of the pad
841 * Returns: the scheduler of the pad.
844 gst_pad_get_sched (GstPad *pad)
846 g_return_val_if_fail (pad != NULL, NULL);
847 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
849 return GST_RPAD_SCHED(pad);
853 * gst_pad_unset_sched:
854 * @pad: the pad to unset the scheduler for
856 * Unset the scheduler for the pad
859 gst_pad_unset_sched (GstPad *pad)
861 g_return_if_fail (pad != NULL);
862 g_return_if_fail (GST_IS_PAD (pad));
864 GST_RPAD_SCHED(pad) = NULL;
868 * gst_pad_get_real_parent:
869 * @pad: the pad to get the parent from
871 * Get the real parent object of this pad. If the pad
872 * is a ghostpad, the actual owner of the real pad is
873 * returned, as opposed to the gst_pad_get_parent().
875 * Returns: the parent object
878 gst_pad_get_real_parent (GstPad *pad)
880 g_return_val_if_fail (pad != NULL, NULL);
881 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
883 return GST_PAD_PARENT (GST_PAD (GST_PAD_REALIZE (pad)));
887 * gst_pad_add_ghost_pad:
888 * @pad: the pad to set the ghost parent
889 * @ghostpad: the ghost pad to add
891 * Add a ghost pad to a pad.
894 gst_pad_add_ghost_pad (GstPad *pad,
899 g_return_if_fail (pad != NULL);
900 g_return_if_fail (GST_IS_PAD (pad));
901 g_return_if_fail (ghostpad != NULL);
902 g_return_if_fail (GST_IS_GHOST_PAD (ghostpad));
904 realpad = GST_PAD_REALIZE (pad);
906 realpad->ghostpads = g_list_prepend (realpad->ghostpads, ghostpad);
911 * gst_pad_remove_ghost_pad:
912 * @pad: the pad to remove the ghost parent
913 * @ghostpad: the ghost pad to remove from the pad
915 * Remove a ghost pad from a pad.
918 gst_pad_remove_ghost_pad (GstPad *pad,
923 g_return_if_fail (pad != NULL);
924 g_return_if_fail (GST_IS_PAD (pad));
925 g_return_if_fail (ghostpad != NULL);
926 g_return_if_fail (GST_IS_GHOST_PAD (ghostpad));
928 realpad = GST_PAD_REALIZE (pad);
930 realpad->ghostpads = g_list_remove (realpad->ghostpads, ghostpad);
934 * gst_pad_get_ghost_pad_list:
935 * @pad: the pad to get the ghost parents from
937 * Get the ghost parents of this pad.
939 * Returns: a GList of ghost pads
942 gst_pad_get_ghost_pad_list (GstPad *pad)
944 g_return_val_if_fail (pad != NULL, NULL);
945 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
947 return GST_PAD_REALIZE(pad)->ghostpads;
950 /* an internal caps negotiation helper function does:
952 * 1. optinally calls the pad connect function with the provided caps
953 * 2. deal with the result code of the connect function
954 * 3. set fixed caps on the pad.
956 static GstPadConnectReturn
957 gst_pad_try_set_caps_func (GstRealPad *pad, GstCaps *caps, gboolean notify)
960 GstPadTemplate *template;
961 GstElement *parent = GST_PAD_PARENT (pad);
963 /* thomas: FIXME: is this the right result to return ? */
964 g_return_val_if_fail (pad != NULL, GST_PAD_CONNECT_REFUSED);
965 g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_CONNECT_REFUSED);
967 /* if this pad has a parent and the parent is not READY, delay the
969 if (parent && GST_STATE (parent) < GST_STATE_READY)
971 GST_DEBUG (GST_CAT_CAPS, "parent %s of pad %s:%s is not ready",
972 GST_ELEMENT_NAME (parent), GST_DEBUG_PAD_NAME (pad));
973 return GST_PAD_CONNECT_DELAYED;
976 GST_INFO (GST_CAT_CAPS, "trying to set caps %p on pad %s:%s",
977 caps, GST_DEBUG_PAD_NAME (pad));
979 if ((template = gst_pad_get_pad_template (GST_PAD_CAST (pad)))) {
980 if (!gst_caps_intersect (caps, gst_pad_template_get_caps (template))) {
981 GST_INFO (GST_CAT_CAPS, "caps did not intersect with %s:%s's padtemplate",
982 GST_DEBUG_PAD_NAME (pad));
983 gst_caps_debug (caps, "caps themselves (attemped to set)");
984 gst_caps_debug (gst_pad_template_get_caps (template),
985 "pad template caps that did not agree with caps");
986 return GST_PAD_CONNECT_REFUSED;
988 /* given that the caps are fixed, we know that their intersection with the
989 * padtemplate caps is the same as caps itself */
992 /* we need to notify the connect function */
993 if (notify && GST_RPAD_CONNECTFUNC (pad)) {
994 GstPadConnectReturn res;
997 GST_INFO (GST_CAT_CAPS, "calling connect function on pad %s:%s",
998 GST_DEBUG_PAD_NAME (pad));
1000 /* call the connect function */
1001 res = GST_RPAD_CONNECTFUNC (pad) (GST_PAD (pad), caps);
1004 case GST_PAD_CONNECT_REFUSED:
1005 debug_string = "REFUSED";
1007 case GST_PAD_CONNECT_OK:
1008 debug_string = "OK";
1010 case GST_PAD_CONNECT_DONE:
1011 debug_string = "DONE";
1013 case GST_PAD_CONNECT_DELAYED:
1014 debug_string = "DELAYED";
1017 g_warning ("unknown return code from connect function of pad %s:%s %d",
1018 GST_DEBUG_PAD_NAME (pad), res);
1019 return GST_PAD_CONNECT_REFUSED;
1022 GST_INFO (GST_CAT_CAPS, "got reply %s (%d) from connect function on pad %s:%s",
1023 debug_string, res, GST_DEBUG_PAD_NAME (pad));
1025 /* done means the connect function called another caps negotiate function
1026 * on this pad that succeeded, we dont need to continue */
1027 if (res == GST_PAD_CONNECT_DONE) {
1028 GST_INFO (GST_CAT_CAPS, "pad %s:%s is done", GST_DEBUG_PAD_NAME (pad));
1029 return GST_PAD_CONNECT_DONE;
1031 if (res == GST_PAD_CONNECT_REFUSED) {
1032 GST_INFO (GST_CAT_CAPS, "pad %s:%s doesn't accept caps",
1033 GST_DEBUG_PAD_NAME (pad));
1034 return GST_PAD_CONNECT_REFUSED;
1037 /* we can only set caps on the pad if they are fixed */
1038 if (GST_CAPS_IS_FIXED (caps)) {
1040 GST_INFO (GST_CAT_CAPS, "setting caps on pad %s:%s",
1041 GST_DEBUG_PAD_NAME (pad));
1042 /* if we got this far all is ok, remove the old caps, set the new one */
1043 oldcaps = GST_PAD_CAPS (pad);
1044 if (caps) gst_caps_ref (caps);
1045 GST_PAD_CAPS (pad) = caps;
1046 if (oldcaps) gst_caps_unref (oldcaps);
1049 GST_INFO (GST_CAT_CAPS, "caps are not fixed on pad %s:%s, not setting them yet",
1050 GST_DEBUG_PAD_NAME (pad));
1053 return GST_PAD_CONNECT_OK;
1057 * gst_pad_try_set_caps:
1058 * @pad: the pad to try to set the caps on
1059 * @caps: the caps to set
1061 * Try to set the caps on the given pad.
1063 * Returns: TRUE if the caps could be set
1066 gst_pad_try_set_caps (GstPad *pad, GstCaps *caps)
1068 GstRealPad *peer, *realpad;
1070 realpad = GST_PAD_REALIZE (pad);
1071 peer = GST_RPAD_PEER (realpad);
1073 GST_INFO (GST_CAT_CAPS, "trying to set caps %p on pad %s:%s",
1074 caps, GST_DEBUG_PAD_NAME (realpad));
1076 gst_caps_debug (caps, "caps that we are trying to set");
1078 /* setting non fixed caps on a pad is not allowed */
1079 if (!GST_CAPS_IS_FIXED (caps)) {
1080 GST_INFO (GST_CAT_CAPS, "trying to set unfixed caps on pad %s:%s, not allowed",
1081 GST_DEBUG_PAD_NAME (realpad));
1082 g_warning ("trying to set non fixed caps on pad %s:%s, not allowed",
1083 GST_DEBUG_PAD_NAME (realpad));
1084 gst_caps_debug (caps, "unfixed caps");
1088 /* if we have a peer try to set the caps, notifying the peerpad
1089 * if it has a connect function */
1090 if (peer && (gst_pad_try_set_caps_func (peer, caps, TRUE) != GST_PAD_CONNECT_OK))
1092 GST_INFO (GST_CAT_CAPS, "tried to set caps on peerpad %s:%s but couldn't",
1093 GST_DEBUG_PAD_NAME (peer));
1097 /* then try to set our own caps, we don't need to be notified */
1098 if (gst_pad_try_set_caps_func (realpad, caps, FALSE) != GST_PAD_CONNECT_OK)
1100 GST_INFO (GST_CAT_CAPS, "tried to set own caps on pad %s:%s but couldn't",
1101 GST_DEBUG_PAD_NAME (realpad));
1104 GST_INFO (GST_CAT_CAPS, "succeeded setting caps %p on pad %s:%s",
1105 caps, GST_DEBUG_PAD_NAME (realpad));
1106 g_assert (GST_PAD_CAPS (pad));
1111 /* this is a caps negotiation convenience routine, it performs:
1113 * 1. optionally clear any pad caps
1114 * 2. calculate the intersection between the two pad tamplate/getcaps caps
1115 * 3. calculate the intersection with the (optional) filtercaps.
1116 * 4. store the intersection in the pad filter
1117 * 5. store the app filtercaps in the pad appfilter.
1118 * 6. start the caps negotiation.
1121 gst_pad_try_reconnect_filtered_func (GstRealPad *srcpad, GstRealPad *sinkpad, GstCaps *filtercaps, gboolean clear)
1123 GstCaps *srccaps, *sinkcaps;
1124 GstCaps *intersection = NULL;
1125 GstRealPad *realsrc, *realsink;
1127 realsrc = GST_PAD_REALIZE (srcpad);
1128 realsink = GST_PAD_REALIZE (sinkpad);
1130 g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE);
1131 g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE);
1133 /* optinally clear the caps */
1135 GST_INFO (GST_CAT_PADS, "reconnect filtered %s:%s and %s:%s, clearing caps",
1136 GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
1138 GST_PAD_CAPS (GST_PAD (realsrc)) = NULL;
1139 GST_PAD_CAPS (GST_PAD (realsink)) = NULL;
1142 GST_INFO (GST_CAT_PADS, "reconnect filtered %s:%s and %s:%s",
1143 GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
1146 srccaps = gst_pad_get_caps (GST_PAD (realsrc));
1147 GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s", GST_DEBUG_PAD_NAME (realsrc));
1148 gst_caps_debug (srccaps, "caps of src pad (pre-reconnect)");
1149 sinkcaps = gst_pad_get_caps (GST_PAD (realsink));
1150 GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s", GST_DEBUG_PAD_NAME (realsink));
1151 gst_caps_debug (sinkcaps, "caps of sink pad (pre-reconnect)");
1153 /* first take the intersection of the pad caps */
1154 intersection = gst_caps_intersect (srccaps, sinkcaps);
1156 /* if we have no intersection but one of the caps was not NULL.. */
1157 if (!intersection && (srccaps || sinkcaps)) {
1158 /* the intersection is NULL but the pad caps were not both NULL,
1159 * this means they have no common format */
1160 GST_INFO (GST_CAT_PADS, "pads %s:%s and %s:%s have no common type",
1161 GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
1163 } else if (intersection) {
1164 GST_INFO (GST_CAT_PADS, "pads %s:%s and %s:%s intersected to %s caps",
1165 GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink),
1166 ((intersection && GST_CAPS_IS_FIXED (intersection)) ? "fixed" : "variable"));
1168 /* then filter this against the app filter */
1170 GstCaps *filtered_intersection = gst_caps_intersect (intersection, filtercaps);
1172 /* get rid of the old intersection here */
1173 gst_caps_unref (intersection);
1175 if (!filtered_intersection) {
1176 GST_INFO (GST_CAT_PADS, "filtered connection between pads %s:%s and %s:%s is empty",
1177 GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
1180 intersection = filtered_intersection;
1182 /* keep a reference to the app caps */
1183 GST_RPAD_APPFILTER (realsink) = filtercaps;
1184 GST_RPAD_APPFILTER (realsrc) = filtercaps;
1187 GST_DEBUG (GST_CAT_CAPS, "setting filter for connection to:");
1188 gst_caps_debug (intersection, "filter for connection");
1190 /* both the app filter and the filter, while stored on both peer pads, are the
1191 equal to the same thing on both */
1192 GST_RPAD_FILTER (realsrc) = intersection;
1193 GST_RPAD_FILTER (realsink) = intersection;
1195 return gst_pad_perform_negotiate (GST_PAD (realsrc), GST_PAD (realsink));
1199 * gst_pad_perform_negotiate:
1201 * @sinkpad: a sinkpad
1203 * Try to negotiate the pads.
1205 * Returns: a boolean indicating the pad succesfully negotiated.
1208 gst_pad_perform_negotiate (GstPad *srcpad, GstPad *sinkpad)
1210 GstCaps *intersection, *filtered_intersection;
1211 GstRealPad *realsrc, *realsink;
1212 GstCaps *srccaps, *sinkcaps, *filter;
1214 g_return_val_if_fail (srcpad != NULL, FALSE);
1215 g_return_val_if_fail (sinkpad != NULL, FALSE);
1217 realsrc = GST_PAD_REALIZE (srcpad);
1218 realsink = GST_PAD_REALIZE (sinkpad);
1220 g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE);
1221 g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE);
1223 filter = GST_RPAD_APPFILTER (realsrc);
1225 GST_INFO (GST_CAT_PADS, "dumping filter for connection %s:%s-%s:%s",
1226 GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
1227 gst_caps_debug (filter, "connection filter caps");
1230 /* calculate the new caps here */
1231 srccaps = gst_pad_get_caps (GST_PAD (realsrc));
1232 GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s", GST_DEBUG_PAD_NAME (realsrc));
1233 gst_caps_debug (srccaps, "src caps, awaiting negotiation, after applying filter");
1234 sinkcaps = gst_pad_get_caps (GST_PAD (realsink));
1235 GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s", GST_DEBUG_PAD_NAME (realsink));
1236 gst_caps_debug (sinkcaps, "sink caps, awaiting negotiation, after applying filter");
1237 intersection = gst_caps_intersect (srccaps, sinkcaps);
1238 filtered_intersection = gst_caps_intersect (intersection, filter);
1239 if (filtered_intersection) {
1240 gst_caps_unref (intersection);
1241 intersection = filtered_intersection;
1244 /* no negotiation is performed if the pads have filtercaps */
1246 GstPadConnectReturn res;
1248 res = gst_pad_try_set_caps_func (realsrc, intersection, TRUE);
1249 if (res == GST_PAD_CONNECT_REFUSED)
1251 if (res == GST_PAD_CONNECT_DONE)
1254 res = gst_pad_try_set_caps_func (realsink, intersection, TRUE);
1255 if (res == GST_PAD_CONNECT_REFUSED)
1257 if (res == GST_PAD_CONNECT_DONE)
1264 * gst_pad_try_reconnect_filtered:
1265 * @srcpad: the source"pad to reconnect
1266 * @sinkpad: the sink pad to reconnect
1267 * @filtercaps: the capabilities to use in the reconnectiong
1269 * Try to reconnect this pad and its peer with the specified caps
1271 * Returns: a boolean indicating the peer pad could accept the caps.
1274 gst_pad_try_reconnect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps)
1276 GstRealPad *realsrc, *realsink;
1278 g_return_val_if_fail (srcpad != NULL, FALSE);
1279 g_return_val_if_fail (sinkpad != NULL, FALSE);
1281 realsrc = GST_PAD_REALIZE (srcpad);
1282 realsink = GST_PAD_REALIZE (sinkpad);
1284 g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE);
1285 g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE);
1287 return gst_pad_try_reconnect_filtered_func (realsrc, realsink, filtercaps, TRUE);
1291 * gst_pad_reconnect_filtered:
1292 * @srcpad: the source"pad to reconnect
1293 * @sinkpad: the sink pad to reconnect
1294 * @filtercaps: the capabilities to use in the reconnectiong
1296 * Try to reconnect this pad and its peer with the specified caps.
1298 * Returns: a boolean indicating the peer pad could accept the caps.
1299 * if FALSE is returned, the pads are disconnected.
1302 gst_pad_reconnect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps)
1304 GstRealPad *realsrc, *realsink;
1306 g_return_val_if_fail (srcpad != NULL, FALSE);
1307 g_return_val_if_fail (sinkpad != NULL, FALSE);
1309 realsrc = GST_PAD_REALIZE (srcpad);
1310 realsink = GST_PAD_REALIZE (sinkpad);
1312 g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE);
1313 g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE);
1315 if (!gst_pad_try_reconnect_filtered_func (realsrc, realsink, filtercaps, TRUE)) {
1316 gst_pad_disconnect (srcpad, GST_PAD (GST_PAD_PEER (srcpad)));
1323 * gst_pad_proxy_connect:
1324 * @pad: the pad to proxy to
1325 * @caps: the capabilities to use in the proxying
1327 * Proxy the connect function to the specified pad.
1329 * Returns: a boolean indicating the peer pad could accept the caps.
1332 gst_pad_proxy_connect (GstPad *pad, GstCaps *caps)
1334 GstRealPad *peer, *realpad;
1336 realpad = GST_PAD_REALIZE (pad);
1338 peer = GST_RPAD_PEER (realpad);
1340 GST_INFO (GST_CAT_CAPS, "proxy connect to pad %s:%s",
1341 GST_DEBUG_PAD_NAME (realpad));
1343 if (peer && gst_pad_try_set_caps_func (peer, caps, TRUE) < 0)
1344 return GST_PAD_CONNECT_REFUSED;
1345 if (gst_pad_try_set_caps_func (realpad, caps, FALSE) < 0)
1346 return GST_PAD_CONNECT_REFUSED;
1348 return GST_PAD_CONNECT_OK;
1353 * @pad: the pad to get the capabilities from
1355 * Get the capabilities of this pad.
1357 * Returns: the capabilities of this pad
1360 gst_pad_get_caps (GstPad *pad)
1362 GstRealPad *realpad;
1364 g_return_val_if_fail (pad != NULL, NULL);
1365 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1367 realpad = GST_PAD_REALIZE (pad);
1369 GST_DEBUG (GST_CAT_CAPS, "get pad caps of %s:%s (%p)",
1370 GST_DEBUG_PAD_NAME (realpad), realpad);
1372 if (GST_PAD_CAPS (realpad)) {
1373 GST_DEBUG (GST_CAT_CAPS, "using pad real caps");
1374 return GST_PAD_CAPS (realpad);
1376 else if GST_RPAD_GETCAPSFUNC (realpad) {
1377 GST_DEBUG (GST_CAT_CAPS, "using pad get function");
1378 return GST_RPAD_GETCAPSFUNC (realpad) (GST_PAD_CAST (realpad), NULL);
1380 else if (GST_PAD_PAD_TEMPLATE (realpad)) {
1381 GST_DEBUG (GST_CAT_CAPS, "using pad template");
1382 return GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (realpad));
1384 GST_DEBUG (GST_CAT_CAPS, "pad has no caps");
1390 * gst_pad_get_pad_template_caps:
1391 * @pad: the pad to get the capabilities from
1393 * Get the capabilities of this pad.
1395 * Returns: a list of the capabilities of this pad
1398 gst_pad_get_pad_template_caps (GstPad *pad)
1400 g_return_val_if_fail (pad != NULL, NULL);
1401 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1403 if (GST_PAD_PAD_TEMPLATE (pad))
1404 return GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (pad));
1411 * gst_pad_template_get_caps_by_name:
1412 * @templ: the padtemplate to get the capabilities from
1413 * @name: the name of the capability to get
1415 * Get the capability with the given name from this padtemplate.
1417 * Returns: a capability or NULL if not found
1420 gst_pad_template_get_caps_by_name (GstPadTemplate *templ, const gchar *name)
1424 g_return_val_if_fail (templ != NULL, NULL);
1426 caps = GST_PAD_TEMPLATE_CAPS (templ);
1430 return gst_caps_get_by_name (caps, name);
1434 * gst_pad_check_compatibility:
1435 * @srcpad: the srcpad to check
1436 * @sinkpad: the sinkpad to check against
1438 * Check if two pads have compatible capabilities.
1440 * Returns: TRUE if they are compatible or the capabilities
1441 * could not be checked
1444 gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad)
1446 g_return_val_if_fail (srcpad != NULL, FALSE);
1447 g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
1448 g_return_val_if_fail (sinkpad != NULL, FALSE);
1449 g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
1451 if (GST_PAD_CAPS (srcpad) && GST_PAD_CAPS (sinkpad)) {
1452 if (!gst_caps_check_compatibility (GST_PAD_CAPS (srcpad), GST_PAD_CAPS (sinkpad))) {
1460 GST_DEBUG (GST_CAT_PADS, "could not check capabilities of pads (%s:%s) and (%s:%s) %p %p",
1461 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad),
1462 GST_PAD_CAPS (srcpad), GST_PAD_CAPS (sinkpad));
1469 * @pad: the pad to get the peer from
1471 * Get the peer pad of this pad.
1473 * Returns: the peer pad
1476 gst_pad_get_peer (GstPad *pad)
1478 g_return_val_if_fail (pad != NULL, NULL);
1479 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1481 return GST_PAD (GST_PAD_PEER (pad));
1485 * gst_pad_get_allowed_caps:
1486 * @pad: the pad to get the allowed caps from
1488 * Get the caps of the allowed media types that can
1489 * go through this pad.
1491 * Returns: the allowed caps, newly allocated
1494 gst_pad_get_allowed_caps (GstPad *pad)
1496 g_return_val_if_fail (pad != NULL, NULL);
1497 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1499 GST_DEBUG (GST_CAT_PROPERTIES, "get allowed caps of %s:%s", GST_DEBUG_PAD_NAME (pad));
1501 return gst_caps_copy (GST_RPAD_FILTER (pad));
1505 * gst_pad_recalc_allowed_caps:
1506 * @pad: the pad to recaculate the caps of
1508 * Attempt to reconnect the pad to its peer through its filter,
1509 * set with gst_pad_[re]connect_filtered. This function is useful when a
1510 * plugin has new capabilities on a pad and wants to notify the peer.
1512 * Returns: TRUE on success, FALSE otherwise.
1515 gst_pad_recalc_allowed_caps (GstPad *pad)
1519 g_return_val_if_fail (pad != NULL, FALSE);
1520 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1522 GST_DEBUG (GST_CAT_PROPERTIES, "set allowed caps of %s:%s", GST_DEBUG_PAD_NAME (pad));
1524 peer = GST_RPAD_PEER (pad);
1526 return gst_pad_try_reconnect_filtered (pad, GST_PAD (peer), GST_RPAD_APPFILTER (pad));
1532 * gst_pad_get_bufferpool:
1533 * @pad: the pad to get the bufferpool from
1535 * Get the bufferpool of the peer pad of the given
1538 * Returns: The GstBufferPool or NULL.
1541 gst_pad_get_bufferpool (GstPad *pad)
1545 g_return_val_if_fail (pad != NULL, NULL);
1546 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1548 peer = GST_RPAD_PEER (pad);
1553 GST_DEBUG_ENTER ("(%s:%s)", GST_DEBUG_PAD_NAME (pad));
1555 if (peer->bufferpoolfunc) {
1556 GST_DEBUG (GST_CAT_PADS, "calling bufferpoolfunc &%s (@%p) of peer pad %s:%s",
1557 GST_DEBUG_FUNCPTR_NAME (peer->bufferpoolfunc), &peer->bufferpoolfunc, GST_DEBUG_PAD_NAME (((GstPad*) peer)));
1558 return (peer->bufferpoolfunc) (((GstPad*) peer));
1560 GST_DEBUG (GST_CAT_PADS, "no bufferpoolfunc for peer pad %s:%s at %p",
1561 GST_DEBUG_PAD_NAME (((GstPad*) peer)), &peer->bufferpoolfunc);
1567 gst_real_pad_dispose (GObject *object)
1569 GstPad *pad = GST_PAD (object);
1571 /* No connected pad can ever be disposed.
1572 * It has to have a parent to be connected and a parent would hold a reference */
1573 g_assert (GST_PAD_PEER (pad) == NULL);
1575 GST_DEBUG (GST_CAT_REFCOUNTING, "dispose %s:%s", GST_DEBUG_PAD_NAME(pad));
1577 if (GST_PAD_PAD_TEMPLATE (pad)){
1578 GST_DEBUG (GST_CAT_REFCOUNTING, "unreffing padtemplate'%s'", GST_OBJECT_NAME (GST_PAD_PAD_TEMPLATE (pad)));
1579 gst_object_unref (GST_OBJECT (GST_PAD_PAD_TEMPLATE (pad)));
1580 GST_PAD_PAD_TEMPLATE (pad) = NULL;
1583 /* we destroy the ghostpads, because they are nothing without the real pad */
1584 if (GST_REAL_PAD (pad)->ghostpads) {
1585 GList *orig, *ghostpads;
1587 orig = ghostpads = g_list_copy (GST_REAL_PAD (pad)->ghostpads);
1590 GstPad *ghostpad = GST_PAD (ghostpads->data);
1592 if (GST_IS_ELEMENT (GST_OBJECT_PARENT (ghostpad))){
1593 GST_DEBUG (GST_CAT_REFCOUNTING, "removing ghost pad from element '%s'",
1594 GST_OBJECT_NAME (GST_OBJECT_PARENT (ghostpad)));
1596 gst_element_remove_ghost_pad (GST_ELEMENT (GST_OBJECT_PARENT (ghostpad)), GST_PAD (ghostpad));
1598 ghostpads = g_list_next (ghostpads);
1601 g_list_free (GST_REAL_PAD(pad)->ghostpads);
1604 if (GST_IS_ELEMENT (GST_OBJECT_PARENT (pad))){
1605 GST_DEBUG (GST_CAT_REFCOUNTING, "removing pad from element '%s'",
1606 GST_OBJECT_NAME (GST_OBJECT (GST_ELEMENT (GST_OBJECT_PARENT (pad)))));
1608 gst_element_remove_pad (GST_ELEMENT (GST_OBJECT_PARENT (pad)), pad);
1611 G_OBJECT_CLASS (real_pad_parent_class)->dispose (object);
1615 #ifndef GST_DISABLE_LOADSAVE
1617 * gst_pad_load_and_connect:
1618 * @self: the XML node to read the description from
1619 * @parent: the element that has the pad
1621 * Read the pad definition from the XML node and connect the given pad
1622 * in element to a pad of an element up in the hierarchy.
1625 gst_pad_load_and_connect (xmlNodePtr self,
1628 xmlNodePtr field = self->xmlChildrenNode;
1629 GstPad *pad = NULL, *targetpad;
1630 guchar *peer = NULL;
1633 GstObject *grandparent;
1636 if (!strcmp (field->name, "name")) {
1637 pad = gst_element_get_pad (GST_ELEMENT (parent), xmlNodeGetContent (field));
1639 else if (!strcmp(field->name, "peer")) {
1640 peer = xmlNodeGetContent (field);
1642 field = field->next;
1644 g_return_if_fail (pad != NULL);
1646 if (peer == NULL) return;
1648 split = g_strsplit (peer, ".", 2);
1650 g_return_if_fail (split[0] != NULL);
1651 g_return_if_fail (split[1] != NULL);
1653 grandparent = gst_object_get_parent (parent);
1655 if (grandparent && GST_IS_BIN (grandparent)) {
1656 target = gst_bin_get_by_name_recurse_up (GST_BIN (grandparent), split[0]);
1661 if (target == NULL) goto cleanup;
1663 targetpad = gst_element_get_pad (target, split[1]);
1665 if (targetpad == NULL) goto cleanup;
1667 gst_pad_connect (pad, targetpad);
1674 * gst_pad_save_thyself:
1675 * @pad: the pad to save
1676 * @parent: the parent XML node to save the description in
1678 * Saves the pad into an xml representation
1680 * Returns: the xml representation of the pad
1683 gst_pad_save_thyself (GstObject *object,
1686 GstRealPad *realpad;
1689 g_return_val_if_fail (GST_IS_REAL_PAD (object), NULL);
1691 realpad = GST_REAL_PAD(object);
1693 xmlNewChild(parent,NULL,"name", GST_PAD_NAME (realpad));
1694 if (GST_RPAD_PEER(realpad) != NULL) {
1695 peer = GST_PAD(GST_RPAD_PEER(realpad));
1696 /* first check to see if the peer's parent's parent is the same */
1697 /* we just save it off */
1698 xmlNewChild(parent,NULL,"peer",g_strdup_printf("%s.%s",
1699 GST_OBJECT_NAME (GST_PAD_PARENT (peer)), GST_PAD_NAME (peer)));
1701 xmlNewChild(parent,NULL,"peer","");
1707 * gst_pad_ghost_save_thyself:
1708 * @pad: the pad to save
1710 * @parent: the parent XML node to save the description in
1712 * Saves the ghost pad into an xml representation.
1714 * Returns: the xml representation of the pad
1717 gst_pad_ghost_save_thyself (GstPad *pad,
1723 g_return_val_if_fail (GST_IS_GHOST_PAD (pad), NULL);
1725 self = xmlNewChild (parent, NULL, "ghostpad", NULL);
1726 xmlNewChild (self, NULL, "name", GST_PAD_NAME (pad));
1727 xmlNewChild (self, NULL, "parent", GST_OBJECT_NAME (GST_PAD_PARENT (pad)));
1729 /* FIXME FIXME FIXME! */
1733 #endif /* GST_DISABLE_LOADSAVE */
1735 #ifndef gst_pad_push
1738 * @pad: the pad to push
1739 * @buf: the buffer to push
1741 * Push a buffer to the peer of the pad.
1744 gst_pad_push (GstPad *pad, GstBuffer *buf)
1746 GstRealPad *peer = GST_RPAD_PEER (pad);
1748 GST_DEBUG_ENTER ("(%s:%s)", GST_DEBUG_PAD_NAME (pad));
1750 g_return_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SRC);
1753 g_warning ("push on pad %s:%s but it is unconnected", GST_DEBUG_PAD_NAME (pad));
1756 if (peer->chainhandler) {
1758 GST_DEBUG (GST_CAT_DATAFLOW, "calling chainhandler &%s of peer pad %s:%s",
1759 GST_DEBUG_FUNCPTR_NAME (peer->chainhandler), GST_DEBUG_PAD_NAME (GST_PAD (peer)));
1760 (peer->chainhandler) (GST_PAD_CAST (peer), buf);
1764 g_warning ("trying to push a NULL buffer on pad %s:%s", GST_DEBUG_PAD_NAME (peer));
1769 g_warning ("(internal error) push on pad %s:%s but it has no chainhandler", GST_DEBUG_PAD_NAME (peer));
1772 /* clean up the mess here */
1774 if (GST_IS_BUFFER (buf))
1775 gst_buffer_unref (buf);
1777 gst_event_free (GST_EVENT (buf));
1782 #ifndef gst_pad_pull
1785 * @pad: the pad to pull
1787 * Pull a buffer from the peer pad.
1789 * Returns: a new buffer from the peer pad.
1792 gst_pad_pull (GstPad *pad)
1794 GstRealPad *peer = GST_RPAD_PEER(pad);
1796 GST_DEBUG_ENTER("(%s:%s)",GST_DEBUG_PAD_NAME(pad));
1798 g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK, NULL);
1801 gst_element_error (GST_PAD_PARENT (pad),
1802 "pull on pad %s:%s but it was unconnected",
1803 GST_ELEMENT_NAME (GST_PAD_PARENT (pad)), GST_PAD_NAME (pad),
1807 if (peer->gethandler) {
1810 GST_DEBUG (GST_CAT_DATAFLOW, "calling gethandler %s of peer pad %s:%s",
1811 GST_DEBUG_FUNCPTR_NAME (peer->gethandler), GST_DEBUG_PAD_NAME (peer));
1813 buf = (peer->gethandler) (GST_PAD_CAST (peer));
1816 /* no null buffers allowed */
1817 gst_element_error (GST_PAD_PARENT (pad),
1818 "NULL buffer during pull on %s:%s", GST_DEBUG_PAD_NAME (pad), NULL);
1821 gst_element_error (GST_PAD_PARENT (pad),
1822 "(internal error) pull on pad %s:%s but the peer pad %s:%s has no gethandler",
1823 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_PAD_NAME (peer),
1831 #ifndef gst_pad_pullregion
1833 * gst_pad_pullregion:
1834 * @pad: the pad to pull the region from
1835 * @type: the regiontype
1836 * @offset: the offset/start of the buffer to pull
1837 * @len: the length of the buffer to pull
1839 * Pull a buffer region from the peer pad. The region to pull can be
1840 * specified with a offset/lenght pair or with a start/legnth time
1841 * indicator as specified by the type parameter.
1843 * Returns: a new buffer from the peer pad with data in the specified
1847 gst_pad_pullregion (GstPad *pad, GstRegionType type, guint64 offset, guint64 len)
1850 GstBuffer *result = NULL;
1852 g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK, NULL);
1855 peer = GST_RPAD_PEER(pad);
1856 g_return_val_if_fail (peer != NULL, NULL);
1859 gst_buffer_unref (result);
1861 GST_DEBUG_ENTER("(%s:%s,%d,%lld,%lld)",GST_DEBUG_PAD_NAME(pad),type,offset,len);
1863 if (peer->pullregionfunc) {
1864 GST_DEBUG (GST_CAT_DATAFLOW, "calling pullregionfunc &%s of peer pad %s:%s",
1865 GST_DEBUG_FUNCPTR_NAME (peer->pullregionfunc), GST_DEBUG_PAD_NAME(GST_PAD_CAST (peer)));
1866 result = (peer->pullregionfunc) (GST_PAD_CAST (peer), type, offset, len);
1868 GST_DEBUG (GST_CAT_DATAFLOW,"no pullregionfunc");
1874 while (result && !(GST_BUFFER_OFFSET (result) == offset &&
1875 GST_BUFFER_SIZE (result) == len));
1883 * @pad: the pad to peek
1885 * Peek for a buffer from the peer pad.
1887 * Returns: a from the peer pad or NULL if the peer has no buffer.
1890 gst_pad_peek (GstPad *pad)
1892 g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK, NULL);
1894 return GST_RPAD_BUFPEN (GST_RPAD_PEER (pad));
1899 * @padlist: A list of pads
1901 * Wait for a buffer on the list of pads.
1903 * Returns: The pad that has a buffer available, use
1904 * #gst_pad_pull to get the buffer.
1907 gst_pad_select (GList *padlist)
1911 pad = gst_scheduler_pad_select (GST_PAD_PARENT (padlist->data)->sched, padlist);
1918 * @pad: The first pad to perform the select on
1921 * Wait for a buffer on the given of pads.
1923 * Returns: The pad that has a buffer available, use
1924 * #gst_pad_pull to get the buffer.
1927 gst_pad_selectv (GstPad *pad, ...)
1930 GList *padlist = NULL;
1936 va_start (var_args, pad);
1939 padlist = g_list_prepend (padlist, pad);
1940 pad = va_arg (var_args, GstPad *);
1942 result = gst_pad_select (padlist);
1943 g_list_free (padlist);
1950 /************************************************************************
1955 static void gst_pad_template_class_init (GstPadTemplateClass *klass);
1956 static void gst_pad_template_init (GstPadTemplate *templ);
1964 static GstObject *padtemplate_parent_class = NULL;
1965 static guint gst_pad_template_signals[TEMPL_LAST_SIGNAL] = { 0 };
1968 gst_pad_template_get_type (void)
1970 static GType padtemplate_type = 0;
1972 if (!padtemplate_type) {
1973 static const GTypeInfo padtemplate_info = {
1974 sizeof(GstPadTemplateClass),
1977 (GClassInitFunc)gst_pad_template_class_init,
1980 sizeof(GstPadTemplate),
1982 (GInstanceInitFunc)gst_pad_template_init,
1985 padtemplate_type = g_type_register_static(GST_TYPE_OBJECT, "GstPadTemplate", &padtemplate_info, 0);
1987 return padtemplate_type;
1991 gst_pad_template_class_init (GstPadTemplateClass *klass)
1993 GObjectClass *gobject_class;
1994 GstObjectClass *gstobject_class;
1996 gobject_class = (GObjectClass*)klass;
1997 gstobject_class = (GstObjectClass*)klass;
1999 padtemplate_parent_class = g_type_class_ref(GST_TYPE_OBJECT);
2001 gst_pad_template_signals[TEMPL_PAD_CREATED] =
2002 g_signal_new ("pad_created", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
2003 G_STRUCT_OFFSET (GstPadTemplateClass, pad_created), NULL, NULL,
2004 gst_marshal_VOID__POINTER, G_TYPE_NONE, 1,
2008 gstobject_class->path_string_separator = "*";
2012 gst_pad_template_init (GstPadTemplate *templ)
2016 /* ALWAYS padtemplates cannot have conversion specifications, it doesn't make
2018 * SOMETIMES padtemplates can do whatever they want, they are provided by the
2020 * REQUEST padtemplates can be reverse-parsed (the user asks for 'sink1', the
2021 * 'sink%d' template is automatically selected), so we need to restrict their
2025 name_is_valid (const gchar *name, GstPadPresence presence)
2029 if (presence == GST_PAD_ALWAYS) {
2030 if (strchr (name, '%')) {
2031 g_warning ("invalid name template %s: conversion specifications are not"
2032 " allowed for GST_PAD_ALWAYS padtemplates", name);
2035 } else if (presence == GST_PAD_REQUEST) {
2036 if ((str = strchr (name, '%')) && strchr (str + 1, '%')) {
2037 g_warning ("invalid name template %s: only one conversion specification"
2038 " allowed in GST_PAD_REQUEST padtemplate", name);
2041 if (str && (*(str+1) != 's' && *(str+1) != 'd')) {
2042 g_warning ("invalid name template %s: conversion specification must be of"
2043 " type '%%d' or '%%s' for GST_PAD_REQUEST padtemplate", name);
2046 if (str && (*(str+2) != '\0')) {
2047 g_warning ("invalid name template %s: conversion specification must appear"
2048 " at the end of the GST_PAD_REQUEST padtemplate name", name);
2057 * gst_pad_template_new:
2058 * @name_template: the name template
2059 * @direction: the direction for the template
2060 * @presence: the presence of the pad
2061 * @caps: a list of capabilities for the template
2062 * @...: more capabilities
2064 * Creates a new padtemplate from the given arguments.
2066 * Returns: the new padtemplate
2069 gst_pad_template_new (const gchar *name_template,
2070 GstPadDirection direction, GstPadPresence presence,
2073 GstPadTemplate *new;
2075 GstCaps *thecaps = NULL;
2077 g_return_val_if_fail (name_template != NULL, NULL);
2079 if (!name_is_valid (name_template, presence))
2082 new = g_object_new (gst_pad_template_get_type (),
2083 "name", name_template,
2086 GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (name_template);
2087 GST_PAD_TEMPLATE_DIRECTION (new) = direction;
2088 GST_PAD_TEMPLATE_PRESENCE (new) = presence;
2090 va_start (var_args, caps);
2093 new->fixed &= caps->fixed;
2094 thecaps = gst_caps_append (thecaps, caps);
2095 caps = va_arg (var_args, GstCaps*);
2099 GST_PAD_TEMPLATE_CAPS (new) = thecaps;
2105 * gst_pad_template_get_caps:
2106 * @templ: the padtemplate to use
2108 * Get the capabilities of the padtemplate
2110 * Returns: a GstCaps*
2113 gst_pad_template_get_caps (GstPadTemplate *templ)
2115 g_return_val_if_fail (templ != NULL, NULL);
2117 return GST_PAD_TEMPLATE_CAPS (templ);
2121 * gst_pad_set_element_private:
2122 * @pad: the pad to set the private data to
2123 * @priv: The private data to attach to the pad
2125 * Set the given private data pointer to the pad. This
2126 * function can only be used by the element that own the
2130 gst_pad_set_element_private (GstPad *pad, gpointer priv)
2132 pad->element_private = priv;
2136 * gst_pad_get_element_private:
2137 * @pad: the pad to get the private data of
2139 * Get the private data of a pad. The private data can
2140 * only be set by the parent element of this pad.
2142 * Returns: a pointer to the private data.
2145 gst_pad_get_element_private (GstPad *pad)
2147 return pad->element_private;
2151 /***** ghost pads *****/
2152 GType _gst_ghost_pad_type = 0;
2154 static void gst_ghost_pad_class_init (GstGhostPadClass *klass);
2155 static void gst_ghost_pad_init (GstGhostPad *pad);
2157 static GstPad *ghost_pad_parent_class = NULL;
2158 /* static guint gst_ghost_pad_signals[LAST_SIGNAL] = { 0 }; */
2161 gst_ghost_pad_get_type (void)
2163 if (!_gst_ghost_pad_type) {
2164 static const GTypeInfo pad_info = {
2165 sizeof (GstGhostPadClass),
2168 (GClassInitFunc) gst_ghost_pad_class_init,
2171 sizeof(GstGhostPad),
2173 (GInstanceInitFunc) gst_ghost_pad_init,
2176 _gst_ghost_pad_type = g_type_register_static (GST_TYPE_PAD, "GstGhostPad", &pad_info, 0);
2178 return _gst_ghost_pad_type;
2182 gst_ghost_pad_class_init (GstGhostPadClass *klass)
2184 GObjectClass *gobject_class;
2186 gobject_class = (GObjectClass*) klass;
2188 ghost_pad_parent_class = g_type_class_ref (GST_TYPE_PAD);
2192 gst_ghost_pad_init (GstGhostPad *pad)
2194 pad->realpad = NULL;
2198 * gst_ghost_pad_new:
2199 * @name: name of the new ghost pad
2200 * @pad: the pad to create a ghost pad of
2202 * Create a new ghost pad associated with the given pad.
2204 * Returns: new ghost pad
2207 gst_ghost_pad_new (gchar *name,
2210 GstGhostPad *ghostpad;
2211 GstRealPad *realpad;
2213 g_return_val_if_fail (name != NULL, NULL);
2214 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2216 ghostpad = g_object_new (gst_ghost_pad_get_type () ,NULL);
2217 gst_pad_set_name (GST_PAD (ghostpad), name);
2219 realpad = (GstRealPad *) pad;
2221 while (!GST_IS_REAL_PAD (realpad)) {
2222 realpad = GST_PAD_REALIZE (realpad);
2224 GST_GPAD_REALPAD (ghostpad) = realpad;
2225 GST_PAD_PAD_TEMPLATE (ghostpad) = GST_PAD_PAD_TEMPLATE (pad);
2227 /* add ourselves to the real pad's list of ghostpads */
2228 gst_pad_add_ghost_pad (pad, GST_PAD (ghostpad));
2230 /* FIXME need to ref the real pad here... ? */
2232 GST_DEBUG (GST_CAT_PADS, "created ghost pad \"%s\"", name);
2234 return GST_PAD (ghostpad);
2238 gst_pad_event_default_dispatch (GstPad *pad, GstElement *element, GstEvent *event)
2240 GList *pads = element->pads;
2243 GstPad *eventpad = GST_PAD (pads->data);
2244 pads = g_list_next (pads);
2246 /* for all pads in the opposite direction that are connected */
2247 if (GST_PAD_DIRECTION (eventpad) != GST_PAD_DIRECTION (pad) && GST_PAD_IS_CONNECTED (eventpad)) {
2248 if (GST_PAD_DIRECTION (eventpad) == GST_PAD_SRC) {
2249 gst_pad_push (eventpad, GST_BUFFER (gst_event_copy (event)));
2252 GstPad *peerpad = GST_PAD_CAST (GST_RPAD_PEER (eventpad));
2254 gst_pad_send_event (peerpad, gst_event_copy (event));
2261 * gst_pad_event_default:
2262 * @pad: the pad to operate on
2263 * @event: the event to handle
2265 * Invoke the default event handler for the given pad.
2268 gst_pad_event_default (GstPad *pad, GstEvent *event)
2270 GstElement *element = GST_PAD_PARENT (pad);
2272 g_signal_emit (G_OBJECT (pad), gst_real_pad_signals[REAL_EVENT_RECEIVED], 0, event);
2274 switch (GST_EVENT_TYPE (event)) {
2276 gst_element_set_eos (element);
2277 gst_pad_event_default_dispatch (pad, element, event);
2278 /* we have to try to schedule another element because this one is disabled */
2279 gst_element_yield (element);
2281 case GST_EVENT_FLUSH:
2283 gst_pad_event_default_dispatch (pad, element, event);
2289 * gst_pad_send_event:
2290 * @pad: the pad to send the event to
2291 * @event: the event to send to the pad.
2293 * Send the event to the pad.
2295 * Returns: TRUE if the event was handled.
2298 gst_pad_send_event (GstPad *pad, GstEvent *event)
2300 gboolean handled = FALSE;
2302 g_return_val_if_fail (event, FALSE);
2304 if (GST_EVENT_SRC (event) == NULL)
2305 GST_EVENT_SRC (event) = gst_object_ref (GST_OBJECT (pad));
2307 GST_DEBUG (GST_CAT_EVENT, "have event %d on pad %s:%s",
2308 GST_EVENT_TYPE (event), GST_DEBUG_PAD_NAME (pad));
2310 if (GST_RPAD_EVENTFUNC (pad))
2311 handled = GST_RPAD_EVENTFUNC (pad) (pad, event);
2313 GST_DEBUG(GST_CAT_EVENT, "there's no event function for pad %s:%s", GST_DEBUG_PAD_NAME (pad));
2317 GST_DEBUG(GST_CAT_EVENT, "proceeding with default event behavior here");
2318 gst_pad_event_default (pad, event);