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"
41 static GstObject *padtemplate_parent_class = NULL;
42 static guint gst_pad_template_signals[TEMPL_LAST_SIGNAL] = { 0 };
44 GType _gst_pad_type = 0;
46 /***** Start with the base GstPad class *****/
47 static void gst_pad_class_init (GstPadClass *klass);
48 static void gst_pad_init (GstPad *pad);
50 static gboolean gst_pad_try_reconnect_filtered_func (GstRealPad *srcpad, GstRealPad *sinkpad,
51 GstCaps *caps, gboolean clear);
53 #ifndef GST_DISABLE_LOADSAVE
54 static xmlNodePtr gst_pad_save_thyself (GstObject *object, xmlNodePtr parent);
57 static GstObject *pad_parent_class = NULL;
60 gst_pad_get_type (void)
63 static const GTypeInfo pad_info = {
64 sizeof (GstPadClass), NULL, NULL,
65 (GClassInitFunc) gst_pad_class_init, NULL, NULL,
68 (GInstanceInitFunc) gst_pad_init, NULL
70 _gst_pad_type = g_type_register_static (GST_TYPE_OBJECT, "GstPad",
77 gst_pad_class_init (GstPadClass *klass)
79 pad_parent_class = g_type_class_ref (GST_TYPE_OBJECT);
83 gst_pad_init (GstPad *pad)
85 pad->element_private = NULL;
87 pad->padtemplate = NULL;
92 /***** Then do the Real Pad *****/
93 /* Pad signals and args */
95 REAL_CAPS_NEGO_FAILED,
109 static void gst_real_pad_class_init (GstRealPadClass *klass);
110 static void gst_real_pad_init (GstRealPad *pad);
112 static void gst_real_pad_set_property (GObject *object, guint prop_id,
115 static void gst_real_pad_get_property (GObject *object, guint prop_id,
119 static void gst_real_pad_dispose (GObject *object);
121 GType _gst_real_pad_type = 0;
123 static GstPad *real_pad_parent_class = NULL;
124 static guint gst_real_pad_signals[REAL_LAST_SIGNAL] = { 0 };
127 gst_real_pad_get_type (void) {
128 if (!_gst_real_pad_type) {
129 static const GTypeInfo pad_info = {
130 sizeof (GstRealPadClass), NULL, NULL,
131 (GClassInitFunc) gst_real_pad_class_init, NULL, NULL,
134 (GInstanceInitFunc) gst_real_pad_init, NULL
136 _gst_real_pad_type = g_type_register_static (GST_TYPE_PAD, "GstRealPad",
139 return _gst_real_pad_type;
143 gst_real_pad_class_init (GstRealPadClass *klass)
145 GObjectClass *gobject_class;
146 GstObjectClass *gstobject_class;
148 gobject_class = (GObjectClass*) klass;
149 gstobject_class = (GstObjectClass*) klass;
151 real_pad_parent_class = g_type_class_ref (GST_TYPE_PAD);
153 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_real_pad_dispose);
154 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_real_pad_set_property);
155 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_real_pad_get_property);
157 gst_real_pad_signals[REAL_CAPS_NEGO_FAILED] =
158 g_signal_new ("caps_nego_failed", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
159 G_STRUCT_OFFSET (GstRealPadClass, caps_nego_failed), NULL, NULL,
160 gst_marshal_VOID__POINTER, G_TYPE_NONE, 1,
162 gst_real_pad_signals[REAL_CONNECTED] =
163 g_signal_new ("connected", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
164 G_STRUCT_OFFSET (GstRealPadClass, connected), NULL, NULL,
165 gst_marshal_VOID__POINTER, G_TYPE_NONE, 1,
167 gst_real_pad_signals[REAL_DISCONNECTED] =
168 g_signal_new ("disconnected", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
169 G_STRUCT_OFFSET (GstRealPadClass, disconnected), NULL, NULL,
170 gst_marshal_VOID__POINTER, G_TYPE_NONE, 1,
173 /* gtk_object_add_arg_type ("GstRealPad::active", G_TYPE_BOOLEAN, */
174 /* GTK_ARG_READWRITE, REAL_ARG_ACTIVE); */
175 g_object_class_install_property (G_OBJECT_CLASS (klass), REAL_ARG_ACTIVE,
176 g_param_spec_boolean ("active", "Active", "Whether the pad is active.",
177 TRUE, G_PARAM_READWRITE));
178 g_object_class_install_property (G_OBJECT_CLASS (klass), REAL_ARG_CAPS,
179 g_param_spec_boxed ("caps", "Caps", "The capabilities of the pad",
180 GST_TYPE_CAPS, G_PARAM_READABLE));
182 #ifndef GST_DISABLE_LOADSAVE
183 gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_pad_save_thyself);
185 gstobject_class->path_string_separator = ".";
189 gst_real_pad_init (GstRealPad *pad)
191 pad->direction = GST_PAD_UNKNOWN;
194 pad->chainfunc = NULL;
197 pad->chainhandler = NULL;
198 pad->gethandler = NULL;
200 pad->bufferpoolfunc = NULL;
201 pad->ghostpads = NULL;
204 pad->connectfunc = NULL;
205 pad->getcapsfunc = NULL;
207 pad->convertfunc = gst_pad_convert_default;
208 pad->eventfunc = gst_pad_event_default;
209 pad->convertfunc = gst_pad_convert_default;
210 pad->queryfunc = gst_pad_query_default;
211 pad->intconnfunc = gst_pad_get_internal_connections_default;
213 pad->eventmaskfunc = gst_pad_get_event_masks_default;
214 pad->formatsfunc = gst_pad_get_formats_default;
215 pad->querytypefunc = gst_pad_get_query_types_default;
217 GST_FLAG_SET (pad, GST_PAD_DISABLED);
218 GST_FLAG_UNSET (pad, GST_PAD_NEGOTIATING);
220 gst_probe_dispatcher_init (&pad->probedisp);
224 gst_real_pad_set_property (GObject *object, guint prop_id,
225 const GValue *value, GParamSpec *pspec)
227 g_return_if_fail (GST_IS_PAD (object));
230 case REAL_ARG_ACTIVE:
231 gst_pad_set_active (GST_PAD (object), g_value_get_boolean (value));
234 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
240 gst_real_pad_get_property (GObject *object, guint prop_id,
241 GValue *value, GParamSpec *pspec)
243 g_return_if_fail (GST_IS_PAD (object));
246 case REAL_ARG_ACTIVE:
247 g_value_set_boolean (value, !GST_FLAG_IS_SET (object, GST_PAD_DISABLED));
250 g_value_set_boxed (value, GST_PAD_CAPS (GST_REAL_PAD (object)));
253 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
260 * gst_pad_custom_new:
261 * @type: the #Gtype of the pad.
262 * @name: the name of the new pad.
263 * @direction: the #GstPadDirection of the pad.
265 * Creates a new pad with the given name and type in the given direction.
266 * If name is NULL, a guaranteed unique name (across all pads)
269 * Returns: a new #GstPad, or NULL in case of an error.
272 gst_pad_custom_new (GType type, const gchar *name,
273 GstPadDirection direction)
277 g_return_val_if_fail (direction != GST_PAD_UNKNOWN, NULL);
279 pad = g_object_new (type, NULL);
280 gst_object_set_name (GST_OBJECT (pad), name);
281 GST_RPAD_DIRECTION (pad) = direction;
283 return GST_PAD (pad);
288 * @name: the name of the new pad.
289 * @direction: the #GstPadDirection of the pad.
291 * Creates a new real pad with the given name in the given direction.
292 * If name is NULL, a guaranteed unique name (across all pads)
295 * Returns: a new #GstPad, or NULL in case of an error.
298 gst_pad_new (const gchar *name,
299 GstPadDirection direction)
301 return gst_pad_custom_new (gst_real_pad_get_type (), name, direction);
305 * gst_pad_custom_new_from_template:
306 * @type: the custom #GType of the pad.
307 * @templ: the #GstPadTemplate to instantiate from.
308 * @name: the name of the new pad.
310 * Creates a new custom pad with the given name from the given template.
311 * If name is NULL, a guaranteed unique name (across all pads)
314 * Returns: a new #GstPad, or NULL in case of an error.
317 gst_pad_custom_new_from_template (GType type, GstPadTemplate *templ,
322 g_return_val_if_fail (templ != NULL, NULL);
324 pad = gst_pad_new (name, templ->direction);
326 gst_object_ref (GST_OBJECT (templ));
327 GST_PAD_PAD_TEMPLATE (pad) = templ;
329 g_signal_emit (G_OBJECT (templ), gst_pad_template_signals[TEMPL_PAD_CREATED], 0, pad);
335 * gst_pad_new_from_template:
336 * @templ: the pad template to use
337 * @name: the name of the element
339 * Creates a new real pad with the given name from the given template.
340 * If name is NULL, a guaranteed unique name (across all pads)
343 * Returns: a new #GstPad, or NULL in case of an error.
346 gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name)
348 return gst_pad_custom_new_from_template (gst_real_pad_get_type (),
353 * gst_pad_get_direction:
354 * @pad: a #GstPad to get the direction of.
356 * Gets the direction of the pad.
358 * Returns: the #GstPadDirection of the pad.
361 gst_pad_get_direction (GstPad *pad)
363 g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_UNKNOWN);
365 return GST_PAD_DIRECTION (pad);
369 * gst_pad_set_active:
370 * @pad: the #GstPad to activate or deactivate.
371 * @active: TRUE to activate the pad.
373 * Activates or deactivates the given pad.
376 gst_pad_set_active (GstPad *pad, gboolean active)
381 g_return_if_fail (GST_IS_PAD (pad));
383 old = GST_PAD_IS_ACTIVE (pad);
388 realpad = GST_PAD_REALIZE (pad);
391 GST_DEBUG (GST_CAT_PADS, "activating pad %s:%s",
392 GST_DEBUG_PAD_NAME (realpad));
393 GST_FLAG_UNSET (realpad, GST_PAD_DISABLED);
395 GST_DEBUG (GST_CAT_PADS, "de-activating pad %s:%s",
396 GST_DEBUG_PAD_NAME (realpad));
397 GST_FLAG_SET (realpad, GST_PAD_DISABLED);
400 g_object_notify (G_OBJECT (realpad), "active");
405 * @pad: the #GstPad to query
407 * Query if a pad is active
409 * Returns: TRUE if the pad is active.
412 gst_pad_is_active (GstPad *pad)
414 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
416 return !GST_FLAG_IS_SET (pad, GST_PAD_DISABLED);
421 * @pad: a #GstPad to set the name of.
422 * @name: the name of the pad.
424 * Sets the name of a pad. If name is NULL, then a guaranteed unique
425 * name will be assigned.
428 gst_pad_set_name (GstPad *pad, const gchar *name)
430 g_return_if_fail (GST_IS_PAD (pad));
432 gst_object_set_name (GST_OBJECT (pad), name);
437 * @pad: a #GstPad to get the name of.
439 * Gets the name of a pad.
441 * Returns: the name of the pad. This is not a newly allocated pointer
442 * so you must not free it.
445 gst_pad_get_name (GstPad *pad)
447 g_return_val_if_fail (pad != NULL, NULL);
448 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
450 return GST_OBJECT_NAME (pad);
454 * gst_pad_set_chain_function:
455 * @pad: a #GstPad to set the chain function for.
456 * @chain: the #GstPadChainFunction to set.
458 * Sets the given chain function for the pad.
461 gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain)
463 g_return_if_fail (pad != NULL);
464 g_return_if_fail (GST_IS_REAL_PAD (pad));
466 GST_RPAD_CHAINFUNC (pad) = chain;
467 GST_DEBUG (GST_CAT_PADS, "chainfunc for %s:%s set to %s",
468 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (chain));
472 * gst_pad_set_get_function:
473 * @pad: a #GstPad to set the get function for.
474 * @get: the #GstPadGetFunction to set.
476 * Sets the given get function for the pad.
479 gst_pad_set_get_function (GstPad *pad,
480 GstPadGetFunction get)
482 g_return_if_fail (pad != NULL);
483 g_return_if_fail (GST_IS_REAL_PAD (pad));
485 GST_RPAD_GETFUNC (pad) = get;
487 GST_DEBUG (GST_CAT_PADS, "getfunc for %s:%s set to %s",
488 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (get));
492 * gst_pad_set_event_function:
493 * @pad: a #GstPad to set the event handler for.
494 * @event: the #GstPadEventFunction to set.
496 * Sets the given event handler for the pad.
499 gst_pad_set_event_function (GstPad *pad,
500 GstPadEventFunction event)
502 g_return_if_fail (GST_IS_REAL_PAD (pad));
504 GST_RPAD_EVENTFUNC (pad) = event;
506 GST_DEBUG (GST_CAT_PADS, "eventfunc for %s:%s set to %s",
507 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (event));
511 * gst_pad_set_event_mask_function:
512 * @pad: a #GstPad to set the event mask function for.
513 * @mask_func: the #GstPadEventMaskFunction to set.
515 * Sets the given event mask function for the pad.
518 gst_pad_set_event_mask_function (GstPad *pad,
519 GstPadEventMaskFunction mask_func)
521 g_return_if_fail (GST_IS_REAL_PAD (pad));
523 GST_RPAD_EVENTMASKFUNC (pad) = mask_func;
525 GST_DEBUG (GST_CAT_PADS, "eventmaskfunc for %s:%s set to %s",
526 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (mask_func));
530 * gst_pad_get_event_masks:
531 * @pad: a #GstPad to get the event mask for.
533 * Gets the array of eventmasks from the given pad.
535 * Returns: an array with eventmasks, the list is ended
539 gst_pad_get_event_masks (GstPad *pad)
546 rpad = GST_PAD_REALIZE (pad);
548 g_return_val_if_fail (rpad, FALSE);
550 if (GST_RPAD_EVENTMASKFUNC (rpad))
551 return GST_RPAD_EVENTMASKFUNC (rpad) (GST_PAD_CAST (pad));
557 gst_pad_get_event_masks_dispatcher (GstPad *pad, const GstEventMask **data)
559 *data = gst_pad_get_event_masks (pad);
565 * gst_pad_get_event_masks_default:
566 * @pad: a #GstPad to get the event mask for.
568 * Invokes the default event masks dispatcher on the pad.
570 * Returns: an array with eventmasks, the list is ended
574 gst_pad_get_event_masks_default (GstPad *pad)
576 GstEventMask *result = NULL;
578 gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
579 gst_pad_get_event_masks_dispatcher, &result);
585 * gst_pad_set_convert_function:
586 * @pad: a #GstPad to set the convert function for.
587 * @convert: the #GstPadConvertFunction to set.
589 * Sets the given convert function for the pad.
592 gst_pad_set_convert_function (GstPad *pad,
593 GstPadConvertFunction convert)
595 g_return_if_fail (pad != NULL);
596 g_return_if_fail (GST_IS_REAL_PAD (pad));
598 GST_RPAD_CONVERTFUNC (pad) = convert;
600 GST_DEBUG (GST_CAT_PADS, "convertfunc for %s:%s set to %s",
601 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (convert));
605 * gst_pad_set_query_function:
606 * @pad: the #GstPad to set the query function for.
607 * @query: the #GstPadQueryFunction to set.
609 * Set the given query function for the pad.
612 gst_pad_set_query_function (GstPad *pad, GstPadQueryFunction query)
614 g_return_if_fail (pad != NULL);
615 g_return_if_fail (GST_IS_REAL_PAD (pad));
617 GST_RPAD_QUERYFUNC (pad) = query;
619 GST_DEBUG (GST_CAT_PADS, "queryfunc for %s:%s set to %s",
620 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (query));
624 * gst_pad_set_query_type_function:
625 * @pad: the #GstPad to set the query type function for.
626 * @type_func: the #GstPadQueryTypeFunction to set.
628 * Set the given query type function for the pad.
631 gst_pad_set_query_type_function (GstPad *pad, GstPadQueryTypeFunction type_func)
633 g_return_if_fail (pad != NULL);
634 g_return_if_fail (GST_IS_REAL_PAD (pad));
636 GST_RPAD_QUERYTYPEFUNC (pad) = type_func;
638 GST_DEBUG (GST_CAT_PADS, "querytypefunc for %s:%s set to %s",
639 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (type_func));
643 * gst_pad_get_query_types:
644 * @pad: the #GstPad to query
646 * Get an array of supported queries that can be performed
649 * Returns: an array of querytypes anded with 0.
652 gst_pad_get_query_types (GstPad *pad)
659 rpad = GST_PAD_REALIZE (pad);
661 g_return_val_if_fail (rpad, FALSE);
663 if (GST_RPAD_QUERYTYPEFUNC (rpad))
664 return GST_RPAD_QUERYTYPEFUNC (rpad) (GST_PAD_CAST (pad));
670 gst_pad_get_query_types_dispatcher (GstPad *pad, const GstQueryType **data)
672 *data = gst_pad_get_query_types (pad);
678 * gst_pad_get_query_types_default:
679 * @pad: the #GstPad to query
681 * Invoke the default dispatcher for the query types on
684 * Returns: an array of querytypes anded with 0.
687 gst_pad_get_query_types_default (GstPad *pad)
689 GstQueryType *result = NULL;
691 gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
692 gst_pad_get_query_types_dispatcher, &result);
698 * gst_pad_set_internal_connection_function:
699 * @pad: a #GstPad to set the internal connection function for.
700 * @intconn: the #GstPadIntConnFunction to set.
702 * Sets the given internal connection function for the pad.
705 gst_pad_set_internal_connection_function (GstPad *pad,
706 GstPadIntConnFunction intconn)
708 g_return_if_fail (pad != NULL);
709 g_return_if_fail (GST_IS_REAL_PAD (pad));
711 GST_RPAD_INTCONNFUNC (pad) = intconn;
712 GST_DEBUG (GST_CAT_PADS, "internal connection for %s:%s set to %s",
713 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (intconn));
717 * gst_pad_set_formats_function:
718 * @pad: the #GstPad to set the formats function for.
719 * @formats: the #GstPadFormatsFunction to set.
721 * Sets the given formats function for the pad.
724 gst_pad_set_formats_function (GstPad *pad, GstPadFormatsFunction formats)
726 g_return_if_fail (pad != NULL);
727 g_return_if_fail (GST_IS_REAL_PAD (pad));
729 GST_RPAD_FORMATSFUNC (pad) = formats;
730 GST_DEBUG (GST_CAT_PADS, "formats function for %s:%s set to %s",
731 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (formats));
735 * gst_pad_set_connect_function:
736 * @pad: a #GstPad to set the connect function for.
737 * @connect: the #GstPadConnectFunction to set.
739 * Sets the given connect function for the pad. It will be called
740 * when the pad is connected or reconnected with caps.
743 gst_pad_set_connect_function (GstPad *pad,
744 GstPadConnectFunction connect)
746 g_return_if_fail (pad != NULL);
747 g_return_if_fail (GST_IS_REAL_PAD (pad));
749 GST_RPAD_CONNECTFUNC (pad) = connect;
750 GST_DEBUG (GST_CAT_PADS, "connectfunc for %s:%s set to %s",
751 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (connect));
755 * gst_pad_set_getcaps_function:
756 * @pad: a #GstPad to set the getcaps function for.
757 * @getcaps: the #GstPadGetCapsFunction to set.
759 * Sets the given getcaps function for the pad.
762 gst_pad_set_getcaps_function (GstPad *pad,
763 GstPadGetCapsFunction getcaps)
765 g_return_if_fail (pad != NULL);
766 g_return_if_fail (GST_IS_REAL_PAD (pad));
768 GST_RPAD_GETCAPSFUNC (pad) = getcaps;
769 GST_DEBUG (GST_CAT_PADS, "getcapsfunc for %s:%s set to %s",
770 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (getcaps));
773 * gst_pad_set_bufferpool_function:
774 * @pad: a #GstPad to set the bufferpool function for.
775 * @bufpool: the #GstPadBufferPoolFunction to set.
777 * Sets the given bufferpool function for the pad. Note that the
778 * bufferpool function can only be set on sinkpads.
781 gst_pad_set_bufferpool_function (GstPad *pad,
782 GstPadBufferPoolFunction bufpool)
784 g_return_if_fail (pad != NULL);
785 g_return_if_fail (GST_IS_REAL_PAD (pad));
786 g_return_if_fail (GST_PAD_IS_SINK (pad));
788 GST_RPAD_BUFFERPOOLFUNC (pad) = bufpool;
789 GST_DEBUG (GST_CAT_PADS, "bufferpoolfunc for %s:%s set to %s",
790 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (bufpool));
794 * gst_pad_disconnect:
795 * @srcpad: the source #GstPad to disconnect.
796 * @sinkpad: the sink #GstPad to disconnect.
798 * Disconnects the source pad from the sink pad.
801 gst_pad_disconnect (GstPad *srcpad,
804 GstRealPad *realsrc, *realsink;
805 GstScheduler *src_sched, *sink_sched;
808 g_return_if_fail (srcpad != NULL);
809 g_return_if_fail (GST_IS_PAD (srcpad));
810 g_return_if_fail (sinkpad != NULL);
811 g_return_if_fail (GST_IS_PAD (sinkpad));
813 GST_INFO (GST_CAT_ELEMENT_PADS, "disconnecting %s:%s(%p) and %s:%s(%p)",
814 GST_DEBUG_PAD_NAME (srcpad), srcpad,
815 GST_DEBUG_PAD_NAME (sinkpad), sinkpad);
817 /* now we need to deal with the real/ghost stuff */
818 realsrc = GST_PAD_REALIZE (srcpad);
819 realsink = GST_PAD_REALIZE (sinkpad);
821 g_return_if_fail (GST_RPAD_PEER (realsrc) != NULL);
822 g_return_if_fail (GST_RPAD_PEER (realsink) == realsrc);
824 if ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SINK) &&
825 (GST_RPAD_DIRECTION (realsink) == GST_PAD_SRC)) {
832 g_return_if_fail ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) &&
833 (GST_RPAD_DIRECTION (realsink) == GST_PAD_SINK));
835 /* get the schedulers before we disconnect */
836 src_sched = gst_pad_get_scheduler (GST_PAD_CAST (realsrc));
837 sink_sched = gst_pad_get_scheduler (GST_PAD_CAST (realsink));
839 /* first clear peers */
840 GST_RPAD_PEER (realsrc) = NULL;
841 GST_RPAD_PEER (realsink) = NULL;
843 /* reset the filters, both filters are refcounted once */
844 if (GST_RPAD_FILTER (realsrc)) {
845 gst_caps_unref (GST_RPAD_FILTER (realsrc));
846 GST_RPAD_FILTER (realsink) = NULL;
847 GST_RPAD_FILTER (realsrc) = NULL;
850 /* now tell the scheduler */
851 if (src_sched && src_sched == sink_sched) {
852 gst_scheduler_pad_disconnect (src_sched,
853 GST_PAD_CAST (realsrc), GST_PAD_CAST (realsink));
856 /* hold a reference, as they can go away in the signal handlers */
857 gst_object_ref (GST_OBJECT (realsrc));
858 gst_object_ref (GST_OBJECT (realsink));
860 /* fire off a signal to each of the pads telling them
861 * that they've been disconnected */
862 g_signal_emit (G_OBJECT (realsrc), gst_real_pad_signals[REAL_DISCONNECTED],
864 g_signal_emit (G_OBJECT (realsink), gst_real_pad_signals[REAL_DISCONNECTED],
867 GST_INFO (GST_CAT_ELEMENT_PADS, "disconnected %s:%s and %s:%s",
868 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
870 gst_object_unref (GST_OBJECT (realsrc));
871 gst_object_unref (GST_OBJECT (realsink));
875 gst_pad_check_schedulers (GstRealPad *realsrc, GstRealPad *realsink)
877 GstScheduler *src_sched, *sink_sched;
878 gint num_decoupled = 0;
880 src_sched = gst_pad_get_scheduler (GST_PAD_CAST (realsrc));
881 sink_sched = gst_pad_get_scheduler (GST_PAD_CAST (realsink));
883 if (src_sched && sink_sched) {
884 if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsrc), GST_ELEMENT_DECOUPLED))
886 if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsink), GST_ELEMENT_DECOUPLED))
889 if (src_sched != sink_sched && num_decoupled != 1) {
897 * gst_pad_can_connect_filtered:
898 * @srcpad: the source #GstPad to connect.
899 * @sinkpad: the sink #GstPad to connect.
900 * @filtercaps: the filter #GstCaps.
902 * Checks if the source pad and the sink pad can be connected when constrained
903 * by the given filter caps.
905 * Returns: TRUE if the pads can be connected, FALSE otherwise.
908 gst_pad_can_connect_filtered (GstPad *srcpad, GstPad *sinkpad,
911 GstRealPad *realsrc, *realsink;
914 g_return_val_if_fail (srcpad != NULL, FALSE);
915 g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
916 g_return_val_if_fail (sinkpad != NULL, FALSE);
917 g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
919 /* now we need to deal with the real/ghost stuff */
920 realsrc = GST_PAD_REALIZE (srcpad);
921 realsink = GST_PAD_REALIZE (sinkpad);
923 g_return_val_if_fail (GST_RPAD_PEER (realsrc) == NULL, FALSE);
924 g_return_val_if_fail (GST_RPAD_PEER (realsink) == NULL, FALSE);
925 g_return_val_if_fail (GST_PAD_PARENT (realsrc) != NULL, FALSE);
926 g_return_val_if_fail (GST_PAD_PARENT (realsink) != NULL, FALSE);
928 if (!gst_pad_check_schedulers (realsrc, realsink)) {
929 g_warning ("connecting pads with different scheds requires "
930 "exactly one decoupled element (queue)");
934 /* check if the directions are compatible */
935 if (!(((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SINK) &&
936 (GST_RPAD_DIRECTION (realsink) == GST_PAD_SRC)) ||
937 ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) &&
938 (GST_RPAD_DIRECTION (realsink) == GST_PAD_SINK))))
944 * gst_pad_can_connect:
945 * @srcpad: the source #GstPad to connect.
946 * @sinkpad: the sink #GstPad to connect.
948 * Checks if the source pad and the sink pad can be connected.
950 * Returns: TRUE if the pads can be connected, FALSE otherwise.
953 gst_pad_can_connect (GstPad *srcpad, GstPad *sinkpad)
955 return gst_pad_can_connect_filtered (srcpad, sinkpad, NULL);
959 * gst_pad_connect_filtered:
960 * @srcpad: the source #GstPad to connect.
961 * @sinkpad: the sink #GstPad to connect.
962 * @filtercaps: the filter #GstCaps.
964 * Connects the source pad and the sink pad can be connected, constrained
965 * by the given filter caps.
967 * Returns: TRUE if the pads have been connected, FALSE otherwise.
970 gst_pad_connect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps)
972 GstRealPad *realsrc, *realsink;
973 GstScheduler *src_sched, *sink_sched;
976 g_return_val_if_fail (srcpad != NULL, FALSE);
977 g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
978 g_return_val_if_fail (sinkpad != NULL, FALSE);
979 g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
981 GST_INFO (GST_CAT_PADS, "trying to connect %s:%s and %s:%s",
982 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
984 /* now we need to deal with the real/ghost stuff */
985 realsrc = GST_PAD_REALIZE (srcpad);
986 realsink = GST_PAD_REALIZE (sinkpad);
988 if ((GST_PAD (realsrc) != srcpad) || (GST_PAD (realsink) != sinkpad)) {
989 GST_INFO (GST_CAT_PADS, "*actually* connecting %s:%s and %s:%s",
990 GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
992 if (GST_RPAD_PEER (realsrc) != NULL) {
993 GST_INFO (GST_CAT_PADS, "Real source pad %s:%s has a peer, failed",
994 GST_DEBUG_PAD_NAME (realsrc));
997 if (GST_RPAD_PEER (realsink) != NULL) {
998 GST_INFO (GST_CAT_PADS, "Real sink pad %s:%s has a peer, failed",
999 GST_DEBUG_PAD_NAME (realsink));
1002 if (GST_PAD_PARENT (realsrc) == NULL) {
1003 GST_INFO (GST_CAT_PADS, "Real src pad %s:%s has no parent, failed",
1004 GST_DEBUG_PAD_NAME (realsrc));
1007 if (GST_PAD_PARENT (realsink) == NULL) {
1008 GST_INFO (GST_CAT_PADS, "Real src pad %s:%s has no parent, failed",
1009 GST_DEBUG_PAD_NAME (realsrc));
1013 if (!gst_pad_check_schedulers (realsrc, realsink)) {
1014 g_warning ("connecting pads with different scheds requires "
1015 "exactly one decoupled element (such as queue)");
1019 /* check for reversed directions and swap if necessary */
1020 if ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SINK) &&
1021 (GST_RPAD_DIRECTION (realsink) == GST_PAD_SRC)) {
1022 GstRealPad *temppad;
1028 if (GST_RPAD_DIRECTION (realsrc) != GST_PAD_SRC) {
1029 GST_INFO (GST_CAT_PADS, "Real src pad %s:%s is not a source pad, failed",
1030 GST_DEBUG_PAD_NAME (realsrc));
1033 if (GST_RPAD_DIRECTION (realsink) != GST_PAD_SINK) {
1034 GST_INFO (GST_CAT_PADS, "Real sink pad %s:%s is not a sink pad, failed",
1035 GST_DEBUG_PAD_NAME (realsink));
1038 /* first set peers */
1039 GST_RPAD_PEER (realsrc) = realsink;
1040 GST_RPAD_PEER (realsink) = realsrc;
1042 /* try to negotiate the pads, we don't need to clear the caps here */
1043 if (!gst_pad_try_reconnect_filtered_func (realsrc, realsink,
1044 filtercaps, FALSE)) {
1045 GST_DEBUG (GST_CAT_CAPS, "reconnect_filtered_func failed, can't connect");
1047 GST_RPAD_PEER (realsrc) = NULL;
1048 GST_RPAD_PEER (realsink) = NULL;
1053 /* fire off a signal to each of the pads telling them
1054 * that they've been connected */
1055 g_signal_emit (G_OBJECT (realsrc), gst_real_pad_signals[REAL_CONNECTED],
1057 g_signal_emit (G_OBJECT (realsink), gst_real_pad_signals[REAL_CONNECTED],
1060 src_sched = gst_pad_get_scheduler (GST_PAD_CAST (realsrc));
1061 sink_sched = gst_pad_get_scheduler (GST_PAD_CAST (realsink));
1063 /* now tell the scheduler */
1064 if (src_sched && src_sched == sink_sched) {
1065 gst_scheduler_pad_connect (src_sched,
1066 GST_PAD_CAST (realsrc), GST_PAD_CAST (realsink));
1069 GST_INFO (GST_CAT_PADS, "connected %s:%s and %s:%s, successful",
1070 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
1071 gst_caps_debug (gst_pad_get_caps (GST_PAD_CAST (realsrc)),
1072 "caps of newly connected src pad");
1079 * @srcpad: the source #GstPad to connect.
1080 * @sinkpad: the sink #GstPad to connect.
1082 * Connects the source pad to the sink pad.
1084 * Returns: TRUE if the pad could be connected, FALSE otherwise.
1087 gst_pad_connect (GstPad *srcpad, GstPad *sinkpad)
1089 return gst_pad_connect_filtered (srcpad, sinkpad, NULL);
1093 * gst_pad_set_parent:
1094 * @pad: a #GstPad to set the parent of.
1095 * @parent: the new parent #GstElement.
1097 * Sets the parent object of a pad.
1100 gst_pad_set_parent (GstPad *pad, GstElement *parent)
1102 g_return_if_fail (pad != NULL);
1103 g_return_if_fail (GST_IS_PAD (pad));
1104 g_return_if_fail (GST_PAD_PARENT (pad) == NULL);
1105 g_return_if_fail (parent != NULL);
1106 g_return_if_fail (GST_IS_OBJECT (parent));
1107 g_return_if_fail ((gpointer) pad != (gpointer) parent);
1109 gst_object_set_parent (GST_OBJECT (pad), GST_OBJECT (parent));
1113 * gst_pad_get_parent:
1114 * @pad: the #GstPad to get the parent of.
1116 * Gets the parent object of this pad.
1118 * Returns: the parent #GstElement.
1121 gst_pad_get_parent (GstPad *pad)
1123 g_return_val_if_fail (pad != NULL, NULL);
1124 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1126 return GST_PAD_PARENT (pad);
1130 * gst_pad_get_pad_template:
1131 * @pad: a #GstPad to get the pad template of.
1133 * Gets the pad template object of this pad.
1135 * Returns: the #GstPadTemplate from which this pad was instantiated.
1138 gst_pad_get_pad_template (GstPad *pad)
1140 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1142 return GST_PAD_PAD_TEMPLATE (pad);
1147 * gst_pad_get_scheduler:
1148 * @pad: a #GstPad to get the scheduler of.
1150 * Gets the scheduler of the pad. Since the pad does not
1151 * have a scheduler of its own, the scheduler of the parent
1152 * is taken. For decoupled pads, the scheduler of the peer
1155 * Returns: the #GstScheduler of the pad.
1158 gst_pad_get_scheduler (GstPad *pad)
1160 GstScheduler *scheduler = NULL;
1163 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1165 parent = gst_pad_get_parent (pad);
1167 if (GST_FLAG_IS_SET (parent, GST_ELEMENT_DECOUPLED)) {
1168 GstRealPad *peer = GST_RPAD_PEER (pad);
1171 scheduler = gst_element_get_scheduler (gst_pad_get_parent (GST_PAD_CAST (peer)));
1175 scheduler = gst_element_get_scheduler (parent);
1183 * gst_pad_get_real_parent:
1184 * @pad: a #GstPad to get the real parent of.
1186 * Gets the real parent object of this pad. If the pad
1187 * is a ghost pad, the actual owner of the real pad is
1188 * returned, as opposed to #gst_pad_get_parent().
1190 * Returns: the parent #GstElement.
1193 gst_pad_get_real_parent (GstPad *pad)
1195 g_return_val_if_fail (pad != NULL, NULL);
1196 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1198 return GST_PAD_PARENT (GST_PAD (GST_PAD_REALIZE (pad)));
1202 * gst_pad_add_ghost_pad:
1203 * @pad: a #GstPad to attach the ghost pad to.
1204 * @ghostpad: the ghost #GstPad to to the pad.
1206 * Adds a ghost pad to a pad.
1209 gst_pad_add_ghost_pad (GstPad *pad,
1212 GstRealPad *realpad;
1214 g_return_if_fail (pad != NULL);
1215 g_return_if_fail (GST_IS_PAD (pad));
1216 g_return_if_fail (ghostpad != NULL);
1217 g_return_if_fail (GST_IS_GHOST_PAD (ghostpad));
1219 realpad = GST_PAD_REALIZE (pad);
1221 realpad->ghostpads = g_list_prepend (realpad->ghostpads, ghostpad);
1226 * gst_pad_remove_ghost_pad:
1227 * @pad: a #GstPad to remove the ghost pad from.
1228 * @ghostpad: the ghost #GstPad to remove from the pad.
1230 * Removes a ghost pad from a pad.
1233 gst_pad_remove_ghost_pad (GstPad *pad,
1236 GstRealPad *realpad;
1238 g_return_if_fail (pad != NULL);
1239 g_return_if_fail (GST_IS_PAD (pad));
1240 g_return_if_fail (ghostpad != NULL);
1241 g_return_if_fail (GST_IS_GHOST_PAD (ghostpad));
1243 realpad = GST_PAD_REALIZE (pad);
1245 realpad->ghostpads = g_list_remove (realpad->ghostpads, ghostpad);
1249 * gst_pad_get_ghost_pad_list:
1250 * @pad: a #GstPad to get the ghost pads of.
1252 * Gets the ghost pads of this pad.
1254 * Returns: a #GList of ghost pads.
1257 gst_pad_get_ghost_pad_list (GstPad *pad)
1259 g_return_val_if_fail (pad != NULL, NULL);
1260 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1262 return GST_PAD_REALIZE(pad)->ghostpads;
1265 /* an internal caps negotiation helper function:
1267 * 1. optionally calls the pad connect function with the provided caps
1268 * 2. deals with the result code of the connect function
1269 * 3. sets fixed caps on the pad.
1271 static GstPadConnectReturn
1272 gst_pad_try_set_caps_func (GstRealPad *pad, GstCaps *caps, gboolean notify)
1274 GstCaps *oldcaps, *allowed = NULL;
1275 GstPadTemplate *template;
1276 GstElement *parent = GST_PAD_PARENT (pad);
1278 g_return_val_if_fail (pad != NULL, GST_PAD_CONNECT_REFUSED);
1279 g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_CONNECT_REFUSED);
1281 /* if this pad has a parent and the parent is not READY, delay the
1283 if (parent && GST_STATE (parent) < GST_STATE_READY)
1285 GST_DEBUG (GST_CAT_CAPS, "parent %s of pad %s:%s is not READY",
1286 GST_ELEMENT_NAME (parent), GST_DEBUG_PAD_NAME (pad));
1287 return GST_PAD_CONNECT_DELAYED;
1290 GST_INFO (GST_CAT_CAPS, "trying to set caps %p on pad %s:%s",
1291 caps, GST_DEBUG_PAD_NAME (pad));
1293 /* first see if we have to check against a filter */
1294 if (!(allowed = GST_RPAD_FILTER (pad))) {
1295 /* no filter, make sure we check against the padtemplate then */
1296 if ((template = gst_pad_get_pad_template (GST_PAD_CAST (pad)))) {
1297 allowed = gst_pad_template_get_caps (template);
1301 /* do we have to check the caps against something? */
1303 GstCaps *intersection;
1305 /* check against calculated caps */
1306 intersection = gst_caps_intersect (caps, allowed);
1308 /* oops, empty intersection, caps don"t have anything in common */
1309 if (!intersection) {
1310 GST_INFO (GST_CAT_CAPS, "caps did not intersect with %s:%s's allowed caps",
1311 GST_DEBUG_PAD_NAME (pad));
1312 gst_caps_debug (caps, "caps themselves (attemped to set)");
1313 gst_caps_debug (allowed,
1314 "allowed caps that did not agree with caps");
1315 return GST_PAD_CONNECT_REFUSED;
1317 /* caps checks out fine, we can unref the intersection now */
1318 gst_caps_unref (intersection);
1319 /* given that the caps are fixed, we know that their intersection with the
1320 * padtemplate caps is the same as caps itself */
1323 /* we need to notify the connect function */
1324 if (notify && GST_RPAD_CONNECTFUNC (pad)) {
1325 GstPadConnectReturn res;
1326 gchar *debug_string;
1327 gboolean negotiating;
1329 GST_INFO (GST_CAT_CAPS, "calling connect function on pad %s:%s",
1330 GST_DEBUG_PAD_NAME (pad));
1332 negotiating = GST_FLAG_IS_SET (pad, GST_PAD_NEGOTIATING);
1334 /* set the NEGOTIATING flag if not already done */
1336 GST_FLAG_SET (pad, GST_PAD_NEGOTIATING);
1338 /* call the connect function */
1339 res = GST_RPAD_CONNECTFUNC (pad) (GST_PAD (pad), caps);
1341 /* unset again after negotiating only if we set it */
1343 GST_FLAG_UNSET (pad, GST_PAD_NEGOTIATING);
1346 case GST_PAD_CONNECT_REFUSED:
1347 debug_string = "REFUSED";
1349 case GST_PAD_CONNECT_OK:
1350 debug_string = "OK";
1352 case GST_PAD_CONNECT_DONE:
1353 debug_string = "DONE";
1355 case GST_PAD_CONNECT_DELAYED:
1356 debug_string = "DELAYED";
1359 g_warning ("unknown return code from connect function of pad %s:%s %d",
1360 GST_DEBUG_PAD_NAME (pad), res);
1361 return GST_PAD_CONNECT_REFUSED;
1364 GST_INFO (GST_CAT_CAPS,
1365 "got reply %s (%d) from connect function on pad %s:%s",
1366 debug_string, res, GST_DEBUG_PAD_NAME (pad));
1368 /* done means the connect function called another caps negotiate function
1369 * on this pad that succeeded, we dont need to continue */
1370 if (res == GST_PAD_CONNECT_DONE) {
1371 GST_INFO (GST_CAT_CAPS, "pad %s:%s is done", GST_DEBUG_PAD_NAME (pad));
1372 return GST_PAD_CONNECT_DONE;
1374 if (res == GST_PAD_CONNECT_REFUSED) {
1375 GST_INFO (GST_CAT_CAPS, "pad %s:%s doesn't accept caps",
1376 GST_DEBUG_PAD_NAME (pad));
1377 return GST_PAD_CONNECT_REFUSED;
1380 /* we can only set caps on the pad if they are fixed */
1381 if (GST_CAPS_IS_FIXED (caps)) {
1383 GST_INFO (GST_CAT_CAPS, "setting caps on pad %s:%s",
1384 GST_DEBUG_PAD_NAME (pad));
1385 /* if we got this far all is ok, remove the old caps, set the new one */
1386 oldcaps = GST_PAD_CAPS (pad);
1387 if (caps) gst_caps_ref (caps);
1388 GST_PAD_CAPS (pad) = caps;
1389 if (oldcaps) gst_caps_unref (oldcaps);
1391 g_object_notify (G_OBJECT (pad), "caps");
1394 GST_INFO (GST_CAT_CAPS,
1395 "caps are not fixed on pad %s:%s, not setting them yet",
1396 GST_DEBUG_PAD_NAME (pad));
1398 return GST_PAD_CONNECT_OK;
1402 * gst_pad_try_set_caps:
1403 * @pad: a #GstPad to try to set the caps on.
1404 * @caps: the #GstCaps to set.
1406 * Tries to set the caps on the given pad.
1408 * Returns: A GstPadConnectReturn value indicating whether the caps
1412 gst_pad_try_set_caps (GstPad *pad, GstCaps *caps)
1414 GstRealPad *peer, *realpad;
1415 GstPadConnectReturn set_retval;
1417 realpad = GST_PAD_REALIZE (pad);
1418 peer = GST_RPAD_PEER (realpad);
1420 GST_INFO (GST_CAT_CAPS, "trying to set caps %p on pad %s:%s",
1421 caps, GST_DEBUG_PAD_NAME (realpad));
1423 gst_caps_debug (caps, "caps that we are trying to set");
1425 /* setting non fixed caps on a pad is not allowed */
1426 if (!GST_CAPS_IS_FIXED (caps)) {
1427 GST_INFO (GST_CAT_CAPS,
1428 "trying to set unfixed caps on pad %s:%s, not allowed",
1429 GST_DEBUG_PAD_NAME (realpad));
1430 g_warning ("trying to set non fixed caps on pad %s:%s, not allowed",
1431 GST_DEBUG_PAD_NAME (realpad));
1432 gst_caps_debug (caps, "unfixed caps");
1433 return GST_PAD_CONNECT_DELAYED;
1436 /* if we have a peer try to set the caps, notifying the peerpad
1437 * if it has a connect function */
1438 if (peer && ((set_retval = gst_pad_try_set_caps_func (peer, caps, TRUE)) <= 0))
1440 GST_INFO (GST_CAT_CAPS, "tried to set caps on peerpad %s:%s but couldn't, return value %d",
1441 GST_DEBUG_PAD_NAME (peer), set_retval);
1445 /* then try to set our own caps, we don't need to be notified */
1446 if ((set_retval = gst_pad_try_set_caps_func (realpad, caps, FALSE)) <= 0)
1448 GST_INFO (GST_CAT_CAPS, "tried to set own caps on pad %s:%s but couldn't, return value %d",
1449 GST_DEBUG_PAD_NAME (realpad), set_retval);
1452 GST_INFO (GST_CAT_CAPS, "succeeded setting caps %p on pad %s:%s, return value %d",
1453 caps, GST_DEBUG_PAD_NAME (realpad), set_retval);
1454 g_assert (GST_PAD_CAPS (pad));
1459 /* this is a caps negotiation convenience routine, it:
1461 * 1. optionally clears any pad caps.
1462 * 2. calculates the intersection between the two pad tamplate/getcaps caps.
1463 * 3. calculates the intersection with the (optional) filtercaps.
1464 * 4. stores the intersection in the pad filter.
1465 * 5. stores the app filtercaps in the pad appfilter.
1466 * 6. starts the caps negotiation.
1469 gst_pad_try_reconnect_filtered_func (GstRealPad *srcpad, GstRealPad *sinkpad,
1470 GstCaps *filtercaps, gboolean clear)
1472 GstCaps *srccaps, *sinkcaps;
1473 GstCaps *intersection = NULL;
1474 GstRealPad *realsrc, *realsink;
1476 realsrc = GST_PAD_REALIZE (srcpad);
1477 realsink = GST_PAD_REALIZE (sinkpad);
1479 g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE);
1480 g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE);
1482 /* optinally clear the caps */
1484 GST_INFO (GST_CAT_PADS,
1485 "start reconnect filtered %s:%s and %s:%s, clearing caps",
1486 GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
1488 GST_PAD_CAPS (GST_PAD (realsrc)) = NULL;
1489 GST_PAD_CAPS (GST_PAD (realsink)) = NULL;
1492 GST_INFO (GST_CAT_PADS, "start reconnect filtered %s:%s and %s:%s",
1493 GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
1496 srccaps = gst_pad_get_caps (GST_PAD (realsrc));
1497 GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s",
1498 GST_DEBUG_PAD_NAME (realsrc));
1499 gst_caps_debug (srccaps, "caps of src pad (pre-reconnect)");
1500 sinkcaps = gst_pad_get_caps (GST_PAD (realsink));
1501 GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s",
1502 GST_DEBUG_PAD_NAME (realsink));
1503 gst_caps_debug (sinkcaps, "caps of sink pad (pre-reconnect)");
1505 /* first take the intersection of the pad caps */
1506 intersection = gst_caps_intersect (srccaps, sinkcaps);
1507 gst_caps_debug (intersection, "caps of intersection");
1509 /* if we have no intersection but one of the caps was not NULL.. */
1510 if (!intersection && (srccaps || sinkcaps)) {
1511 /* the intersection is NULL but the pad caps were not both NULL,
1512 * this means they have no common format */
1513 GST_INFO (GST_CAT_PADS, "pads %s:%s and %s:%s have no common type",
1514 GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
1516 } else if (intersection) {
1517 GST_INFO (GST_CAT_PADS, "pads %s:%s and %s:%s intersected to %s caps",
1518 GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink),
1519 ((intersection && GST_CAPS_IS_FIXED (intersection)) ? "fixed" : "variable"));
1521 /* then filter this against the app filter */
1523 GstCaps *filtered_intersection = gst_caps_intersect (intersection,
1526 /* get rid of the old intersection here */
1527 gst_caps_unref (intersection);
1529 if (!filtered_intersection) {
1530 GST_INFO (GST_CAT_PADS,
1531 "filtered connection between pads %s:%s and %s:%s is empty",
1532 GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
1535 intersection = filtered_intersection;
1537 /* keep a reference to the app caps */
1538 GST_RPAD_APPFILTER (realsink) = filtercaps;
1539 GST_RPAD_APPFILTER (realsrc) = filtercaps;
1542 GST_DEBUG (GST_CAT_CAPS, "setting filter for connection to:");
1543 gst_caps_debug (intersection, "filter for connection");
1545 /* both the app filter and the filter, while stored on both peer pads,
1546 * are equal to the same thing on both */
1547 GST_RPAD_FILTER (realsrc) = intersection;
1548 GST_RPAD_FILTER (realsink) = intersection;
1550 return gst_pad_perform_negotiate (GST_PAD (realsrc), GST_PAD (realsink));
1554 * gst_pad_perform_negotiate:
1555 * @srcpad: the source #GstPad.
1556 * @sinkpad: the sink #GstPad.
1558 * Tries to negotiate the pads.
1560 * Returns: TRUE if the pads were succesfully negotiated, FALSE otherwise.
1563 gst_pad_perform_negotiate (GstPad *srcpad, GstPad *sinkpad)
1565 GstCaps *intersection, *filtered_intersection;
1566 GstRealPad *realsrc, *realsink;
1567 GstCaps *srccaps, *sinkcaps, *filter;
1569 g_return_val_if_fail (srcpad != NULL, FALSE);
1570 g_return_val_if_fail (sinkpad != NULL, FALSE);
1572 realsrc = GST_PAD_REALIZE (srcpad);
1573 realsink = GST_PAD_REALIZE (sinkpad);
1575 g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE);
1576 g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE);
1578 filter = GST_RPAD_APPFILTER (realsrc);
1580 GST_INFO (GST_CAT_PADS, "dumping filter for connection %s:%s-%s:%s",
1581 GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
1582 gst_caps_debug (filter, "connection filter caps");
1585 /* calculate the new caps here */
1586 srccaps = gst_pad_get_caps (GST_PAD (realsrc));
1587 GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s",
1588 GST_DEBUG_PAD_NAME (realsrc));
1589 gst_caps_debug (srccaps,
1590 "src caps, awaiting negotiation, after applying filter");
1591 sinkcaps = gst_pad_get_caps (GST_PAD (realsink));
1592 GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s",
1593 GST_DEBUG_PAD_NAME (realsink));
1594 gst_caps_debug (sinkcaps,
1595 "sink caps, awaiting negotiation, after applying filter");
1596 intersection = gst_caps_intersect (srccaps, sinkcaps);
1597 filtered_intersection = gst_caps_intersect (intersection, filter);
1598 if (filtered_intersection) {
1599 gst_caps_unref (intersection);
1600 intersection = filtered_intersection;
1603 /* no negotiation is performed if the pads have filtercaps */
1605 GstPadConnectReturn res;
1607 res = gst_pad_try_set_caps_func (realsrc, intersection, TRUE);
1608 if (res == GST_PAD_CONNECT_REFUSED)
1610 if (res == GST_PAD_CONNECT_DONE)
1613 res = gst_pad_try_set_caps_func (realsink, intersection, TRUE);
1614 if (res == GST_PAD_CONNECT_REFUSED)
1616 if (res == GST_PAD_CONNECT_DONE)
1623 * gst_pad_try_reconnect_filtered:
1624 * @srcpad: the source #GstPad to reconnect.
1625 * @sinkpad: the sink #GstPad to reconnect.
1626 * @filtercaps: the #GstPad to use as a filter in the reconnection.
1628 * Tries to reconnect the given source and sink pad, constrained by the given
1631 * Returns: TRUE if the pads were succesfully renegotiated, FALSE otherwise.
1634 gst_pad_try_reconnect_filtered (GstPad *srcpad, GstPad *sinkpad,
1635 GstCaps *filtercaps)
1637 GstRealPad *realsrc, *realsink;
1639 g_return_val_if_fail (srcpad != NULL, FALSE);
1640 g_return_val_if_fail (sinkpad != NULL, FALSE);
1642 realsrc = GST_PAD_REALIZE (srcpad);
1643 realsink = GST_PAD_REALIZE (sinkpad);
1645 g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE);
1646 g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE);
1648 return gst_pad_try_reconnect_filtered_func (realsrc, realsink,
1653 * gst_pad_reconnect_filtered:
1654 * @srcpad: the source #GstPad to reconnect.
1655 * @sinkpad: the sink #GstPad to reconnect.
1656 * @filtercaps: the #GstPad to use as a filter in the reconnection.
1658 * Reconnects the given source and sink pad, constrained by the given
1659 * capabilities. If the reconnection fails, the pads are disconnected
1660 * and FALSE is returned.
1662 * Returns: TRUE if the pads were succesfully reconnected, FALSE otherwise.
1665 gst_pad_reconnect_filtered (GstPad *srcpad, GstPad *sinkpad,
1666 GstCaps *filtercaps)
1668 GstRealPad *realsrc, *realsink;
1670 g_return_val_if_fail (srcpad != NULL, FALSE);
1671 g_return_val_if_fail (sinkpad != NULL, FALSE);
1673 realsrc = GST_PAD_REALIZE (srcpad);
1674 realsink = GST_PAD_REALIZE (sinkpad);
1676 g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE);
1677 g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE);
1679 if (! gst_pad_try_reconnect_filtered_func (realsrc, realsink,
1680 filtercaps, TRUE)) {
1681 gst_pad_disconnect (srcpad, GST_PAD (GST_PAD_PEER (srcpad)));
1688 * gst_pad_proxy_connect:
1689 * @pad: a #GstPad to proxy to.
1690 * @caps: the #GstCaps to use in proxying.
1692 * Proxies the connect function to the specified pad.
1694 * Returns: TRUE if the peer pad accepted the caps, FALSE otherwise.
1697 gst_pad_proxy_connect (GstPad *pad, GstCaps *caps)
1699 GstRealPad *peer, *realpad;
1701 realpad = GST_PAD_REALIZE (pad);
1703 peer = GST_RPAD_PEER (realpad);
1705 GST_INFO (GST_CAT_CAPS, "proxy connect to pad %s:%s",
1706 GST_DEBUG_PAD_NAME (realpad));
1708 if (peer && gst_pad_try_set_caps_func (peer, caps, TRUE) < 0)
1709 return GST_PAD_CONNECT_REFUSED;
1710 if (gst_pad_try_set_caps_func (realpad, caps, FALSE) < 0)
1711 return GST_PAD_CONNECT_REFUSED;
1713 return GST_PAD_CONNECT_OK;
1718 * @pad: a #GstPad to get the capabilities of.
1720 * Gets the capabilities of this pad.
1722 * Returns: the #GstCaps of this pad.
1725 gst_pad_get_caps (GstPad *pad)
1727 GstRealPad *realpad;
1729 g_return_val_if_fail (pad != NULL, NULL);
1730 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1732 realpad = GST_PAD_REALIZE (pad);
1734 GST_DEBUG (GST_CAT_CAPS, "get pad caps of %s:%s (%p)",
1735 GST_DEBUG_PAD_NAME (realpad), realpad);
1737 if (GST_PAD_CAPS (realpad)) {
1738 GST_DEBUG (GST_CAT_CAPS, "using pad real caps %p", GST_PAD_CAPS (realpad));
1739 return GST_PAD_CAPS (realpad);
1741 else if GST_RPAD_GETCAPSFUNC (realpad) {
1742 GST_DEBUG (GST_CAT_CAPS, "using pad get function");
1743 return GST_RPAD_GETCAPSFUNC (realpad) (GST_PAD_CAST (realpad), NULL);
1745 else if (GST_PAD_PAD_TEMPLATE (realpad)) {
1746 GstPadTemplate *templ = GST_PAD_PAD_TEMPLATE (realpad);
1747 GST_DEBUG (GST_CAT_CAPS, "using pad template %p with caps %p",
1748 templ, GST_PAD_TEMPLATE_CAPS (templ));
1749 return GST_PAD_TEMPLATE_CAPS (templ);
1751 GST_DEBUG (GST_CAT_CAPS, "pad has no caps");
1757 * gst_pad_get_pad_template_caps:
1758 * @pad: a #GstPad to get the template capabilities from.
1760 * Gets the template capabilities of this pad.
1762 * Returns: the template #GstCaps of this pad.
1765 gst_pad_get_pad_template_caps (GstPad *pad)
1767 g_return_val_if_fail (pad != NULL, NULL);
1768 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1770 if (GST_PAD_PAD_TEMPLATE (pad))
1771 return GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (pad));
1777 * gst_pad_template_get_caps_by_name:
1778 * @templ: a #GstPadTemplate to get the capabilities of.
1779 * @name: the name of the capability to get.
1781 * Gets the capability with the given name from this pad template.
1783 * Returns: the #GstCaps, or NULL if not found or in case of an error.
1786 gst_pad_template_get_caps_by_name (GstPadTemplate *templ, const gchar *name)
1790 g_return_val_if_fail (templ != NULL, NULL);
1792 caps = GST_PAD_TEMPLATE_CAPS (templ);
1796 return gst_caps_get_by_name (caps, name);
1800 * gst_pad_check_compatibility:
1801 * @srcpad: the source #GstPad to check.
1802 * @sinkpad: the sink #GstPad to check against.
1804 * Checks if two pads have compatible capabilities.
1806 * Returns: TRUE if they are compatible or if the capabilities
1807 * could not be checked
1810 gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad)
1812 g_return_val_if_fail (srcpad != NULL, FALSE);
1813 g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
1814 g_return_val_if_fail (sinkpad != NULL, FALSE);
1815 g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
1817 if (GST_PAD_CAPS (srcpad) && GST_PAD_CAPS (sinkpad)) {
1818 if (!gst_caps_is_always_compatible (GST_PAD_CAPS (srcpad),
1819 GST_PAD_CAPS (sinkpad))) {
1827 GST_DEBUG (GST_CAT_PADS,
1828 "could not check capabilities of pads (%s:%s) and (%s:%s) %p %p",
1829 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad),
1830 GST_PAD_CAPS (srcpad), GST_PAD_CAPS (sinkpad));
1837 * @pad: a #GstPad to get the peer of.
1839 * Gets the peer pad of this pad.
1841 * Returns: the peer #GstPad.
1844 gst_pad_get_peer (GstPad *pad)
1846 g_return_val_if_fail (pad != NULL, NULL);
1847 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1849 return GST_PAD (GST_PAD_PEER (pad));
1853 * gst_pad_get_allowed_caps:
1854 * @pad: a #GstPad to get the allowed caps of.
1856 * Gets the capabilities of the allowed media types that can
1857 * flow through this pad. The caller must free the resulting caps.
1859 * Returns: a newly allocated copy of the allowed #GstCaps.
1862 gst_pad_get_allowed_caps (GstPad *pad)
1864 g_return_val_if_fail (pad != NULL, NULL);
1865 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1867 GST_DEBUG (GST_CAT_PROPERTIES, "get allowed caps of %s:%s",
1868 GST_DEBUG_PAD_NAME (pad));
1870 return gst_caps_copy (GST_RPAD_FILTER (pad));
1874 * gst_pad_recalc_allowed_caps:
1875 * @pad: a #GstPad to recalculate the capablities of.
1877 * Attempts to reconnect the pad to its peer through its filter,
1878 * set with gst_pad_[re]connect_filtered. This function is useful when a
1879 * plug-in has new capabilities on a pad and wants to notify the peer.
1881 * Returns: TRUE on success, FALSE otherwise.
1884 gst_pad_recalc_allowed_caps (GstPad *pad)
1888 g_return_val_if_fail (pad != NULL, FALSE);
1889 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1891 GST_DEBUG (GST_CAT_PROPERTIES, "set allowed caps of %s:%s",
1892 GST_DEBUG_PAD_NAME (pad));
1894 peer = GST_RPAD_PEER (pad);
1896 return gst_pad_try_reconnect_filtered (pad, GST_PAD (peer),
1897 GST_RPAD_APPFILTER (pad));
1903 * gst_pad_get_bufferpool:
1904 * @pad: a #GstPad to get the bufferpool from.
1906 * Gets the bufferpool of the peer pad of the given pad.Note that
1907 * a bufferpool can only be obtained from a srcpad.
1909 * Returns: the #GstBufferPool, or NULL in case of an error.
1912 gst_pad_get_bufferpool (GstPad *pad)
1916 g_return_val_if_fail (pad != NULL, NULL);
1917 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1918 g_return_val_if_fail (GST_PAD_IS_SRC (pad), NULL);
1920 peer = GST_RPAD_PEER (pad);
1925 GST_DEBUG_ENTER ("(%s:%s)", GST_DEBUG_PAD_NAME (pad));
1927 if (peer->bufferpoolfunc) {
1928 GST_DEBUG (GST_CAT_PADS,
1929 "calling bufferpoolfunc &%s (@%p) of peer pad %s:%s",
1930 GST_DEBUG_FUNCPTR_NAME (peer->bufferpoolfunc),
1931 &peer->bufferpoolfunc, GST_DEBUG_PAD_NAME (((GstPad*) peer)));
1932 return (peer->bufferpoolfunc) (((GstPad*) peer));
1934 GST_DEBUG (GST_CAT_PADS, "no bufferpoolfunc for peer pad %s:%s at %p",
1935 GST_DEBUG_PAD_NAME (((GstPad*) peer)), &peer->bufferpoolfunc);
1941 gst_real_pad_dispose (GObject *object)
1943 GstPad *pad = GST_PAD (object);
1945 /* No connected pad can ever be disposed.
1946 * It has to have a parent to be connected
1947 * and a parent would hold a reference */
1948 g_assert (GST_PAD_PEER (pad) == NULL);
1950 GST_DEBUG (GST_CAT_REFCOUNTING, "dispose %s:%s", GST_DEBUG_PAD_NAME(pad));
1952 if (GST_PAD_PAD_TEMPLATE (pad)){
1953 GST_DEBUG (GST_CAT_REFCOUNTING, "unreffing padtemplate'%s'",
1954 GST_OBJECT_NAME (GST_PAD_PAD_TEMPLATE (pad)));
1955 gst_object_unref (GST_OBJECT (GST_PAD_PAD_TEMPLATE (pad)));
1956 GST_PAD_PAD_TEMPLATE (pad) = NULL;
1959 /* we destroy the ghostpads, because they are nothing without the real pad */
1960 if (GST_REAL_PAD (pad)->ghostpads) {
1961 GList *orig, *ghostpads;
1963 orig = ghostpads = g_list_copy (GST_REAL_PAD (pad)->ghostpads);
1966 GstPad *ghostpad = GST_PAD (ghostpads->data);
1968 if (GST_IS_ELEMENT (GST_OBJECT_PARENT (ghostpad))){
1969 GST_DEBUG (GST_CAT_REFCOUNTING, "removing ghost pad from element '%s'",
1970 GST_OBJECT_NAME (GST_OBJECT_PARENT (ghostpad)));
1972 gst_element_remove_ghost_pad (GST_ELEMENT (GST_OBJECT_PARENT (ghostpad)), GST_PAD (ghostpad));
1974 ghostpads = g_list_next (ghostpads);
1977 g_list_free (GST_REAL_PAD(pad)->ghostpads);
1980 if (GST_IS_ELEMENT (GST_OBJECT_PARENT (pad))) {
1981 GST_DEBUG (GST_CAT_REFCOUNTING, "removing pad from element '%s'",
1982 GST_OBJECT_NAME (GST_OBJECT (GST_ELEMENT (GST_OBJECT_PARENT (pad)))));
1984 gst_element_remove_pad (GST_ELEMENT (GST_OBJECT_PARENT (pad)), pad);
1987 G_OBJECT_CLASS (real_pad_parent_class)->dispose (object);
1991 #ifndef GST_DISABLE_LOADSAVE
1992 /* FIXME: why isn't this on a GstElement ? */
1994 * gst_pad_load_and_connect:
1995 * @self: an #xmlNodePtr to read the description from.
1996 * @parent: the #GstObject element that owns the pad.
1998 * Reads the pad definition from the XML node and connects the given pad
1999 * in the element to a pad of an element up in the hierarchy.
2002 gst_pad_load_and_connect (xmlNodePtr self, GstObject *parent)
2004 xmlNodePtr field = self->xmlChildrenNode;
2005 GstPad *pad = NULL, *targetpad;
2009 GstObject *grandparent;
2012 if (!strcmp (field->name, "name")) {
2013 pad = gst_element_get_pad (GST_ELEMENT (parent),
2014 xmlNodeGetContent (field));
2016 else if (!strcmp(field->name, "peer")) {
2017 peer = xmlNodeGetContent (field);
2019 field = field->next;
2021 g_return_if_fail (pad != NULL);
2023 if (peer == NULL) return;
2025 split = g_strsplit (peer, ".", 2);
2027 if (split[0] == NULL || split[1] == NULL) {
2028 GST_DEBUG (GST_CAT_XML,
2029 "Could not parse peer '%s' for pad %s:%s, leaving unconnected",
2030 peer, GST_DEBUG_PAD_NAME (pad));
2034 g_return_if_fail (split[0] != NULL);
2035 g_return_if_fail (split[1] != NULL);
2037 grandparent = gst_object_get_parent (parent);
2039 if (grandparent && GST_IS_BIN (grandparent)) {
2040 target = gst_bin_get_by_name_recurse_up (GST_BIN (grandparent), split[0]);
2045 if (target == NULL) goto cleanup;
2047 targetpad = gst_element_get_pad (target, split[1]);
2049 if (targetpad == NULL) goto cleanup;
2051 gst_pad_connect (pad, targetpad);
2058 * gst_pad_save_thyself:
2059 * @pad: a #GstPad to save.
2060 * @parent: the parent #xmlNodePtr to save the description in.
2062 * Saves the pad into an xml representation.
2064 * Returns: the #xmlNodePtr representation of the pad.
2067 gst_pad_save_thyself (GstObject *object, xmlNodePtr parent)
2069 GstRealPad *realpad;
2072 g_return_val_if_fail (GST_IS_REAL_PAD (object), NULL);
2074 realpad = GST_REAL_PAD (object);
2076 xmlNewChild (parent, NULL, "name", GST_PAD_NAME (realpad));
2077 if (GST_RPAD_PEER (realpad) != NULL) {
2080 peer = GST_PAD (GST_RPAD_PEER (realpad));
2081 /* first check to see if the peer's parent's parent is the same */
2082 /* we just save it off */
2083 content = g_strdup_printf ("%s.%s",
2084 GST_OBJECT_NAME (GST_PAD_PARENT (peer)),
2085 GST_PAD_NAME (peer));
2086 xmlNewChild (parent, NULL, "peer", content);
2089 xmlNewChild (parent, NULL, "peer", "");
2094 /* FIXME: shouldn't pad and ghost be switched ?
2097 * gst_ghost_pad_save_thyself:
2098 * @pad: a ghost #GstPad to save.
2099 * @parent: the parent #xmlNodePtr to save the description in.
2101 * Saves the ghost pad into an xml representation.
2103 * Returns: the #xmlNodePtr representation of the pad.
2106 gst_ghost_pad_save_thyself (GstPad *pad, xmlNodePtr parent)
2110 g_return_val_if_fail (GST_IS_GHOST_PAD (pad), NULL);
2112 self = xmlNewChild (parent, NULL, "ghostpad", NULL);
2113 xmlNewChild (self, NULL, "name", GST_PAD_NAME (pad));
2114 xmlNewChild (self, NULL, "parent", GST_OBJECT_NAME (GST_PAD_PARENT (pad)));
2116 /* FIXME FIXME FIXME! */
2120 #endif /* GST_DISABLE_LOADSAVE */
2124 * @pad: a #GstPad to push the buffer out of.
2125 * @buf: the #GstBuffer to push.
2127 * Pushes a buffer to the peer of the pad.
2130 gst_pad_push (GstPad *pad, GstBuffer *buf)
2134 GST_DEBUG_ENTER ("(%s:%s)", GST_DEBUG_PAD_NAME (pad));
2136 g_return_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SRC);
2138 if (!gst_probe_dispatcher_dispatch (&(GST_REAL_PAD (pad)->probedisp), GST_DATA (buf)))
2141 peer = GST_RPAD_PEER (pad);
2144 g_warning ("push on pad %s:%s but it is unconnected",
2145 GST_DEBUG_PAD_NAME (pad));
2148 if (!GST_IS_EVENT (buf) && !GST_PAD_IS_ACTIVE (pad)) {
2149 g_warning ("push on pad %s:%s but it is not active",
2150 GST_DEBUG_PAD_NAME (pad));
2154 if (peer->chainhandler) {
2156 GST_DEBUG (GST_CAT_DATAFLOW,
2157 "calling chainhandler &%s of peer pad %s:%s",
2158 GST_DEBUG_FUNCPTR_NAME (peer->chainhandler),
2159 GST_DEBUG_PAD_NAME (GST_PAD (peer)));
2160 if (!gst_probe_dispatcher_dispatch (&peer->probedisp, GST_DATA (buf)))
2163 (peer->chainhandler) (GST_PAD_CAST (peer), buf);
2167 g_warning ("trying to push a NULL buffer on pad %s:%s",
2168 GST_DEBUG_PAD_NAME (peer));
2173 g_warning ("internal error: push on pad %s:%s but it has no chainhandler",
2174 GST_DEBUG_PAD_NAME (peer));
2177 /* clean up the mess here */
2178 if (buf != NULL) gst_data_unref (GST_DATA (buf));
2183 * @pad: a #GstPad to pull a buffer from.
2185 * Pulls a buffer from the peer pad.
2187 * Returns: a new #GstBuffer from the peer pad.
2190 gst_pad_pull (GstPad *pad)
2194 GST_DEBUG_ENTER("(%s:%s)",GST_DEBUG_PAD_NAME(pad));
2196 g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK, NULL);
2198 peer = GST_RPAD_PEER (pad);
2201 gst_element_error (GST_PAD_PARENT (pad),
2202 "pull on pad %s:%s but it was unconnected",
2203 GST_ELEMENT_NAME (GST_PAD_PARENT (pad)),
2204 GST_PAD_NAME (pad), NULL);
2207 if (peer->gethandler) {
2209 gboolean active = GST_PAD_IS_ACTIVE (peer);
2211 GST_DEBUG (GST_CAT_DATAFLOW, "calling gethandler %s of peer pad %s:%s",
2212 GST_DEBUG_FUNCPTR_NAME (peer->gethandler),
2213 GST_DEBUG_PAD_NAME (peer));
2215 buf = (peer->gethandler) (GST_PAD_CAST (peer));
2218 if (!gst_probe_dispatcher_dispatch (&peer->probedisp, GST_DATA (buf)))
2221 if (!GST_IS_EVENT (buf) && !active) {
2222 g_warning ("pull on pad %s:%s but it is not active",
2223 GST_DEBUG_PAD_NAME (peer));
2229 /* no null buffers allowed */
2230 gst_element_error (GST_PAD_PARENT (pad),
2231 "NULL buffer during pull on %s:%s",
2232 GST_DEBUG_PAD_NAME (pad), NULL);
2235 gst_element_error (GST_PAD_PARENT (pad),
2236 "internal error: pull on pad %s:%s "
2237 "but the peer pad %s:%s has no gethandler",
2238 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_PAD_NAME (peer),
2247 * @padlist: a #GList of pads.
2249 * Waits for a buffer on any of the list of pads.
2251 * Returns: the #GstPad that has a buffer available.
2252 * Use #gst_pad_pull() to get the buffer.
2255 gst_pad_select (GList *padlist)
2259 pad = gst_scheduler_pad_select (GST_PAD_PARENT (padlist->data)->sched,
2266 * @pad: a first #GstPad to perform the select on.
2267 * @...: A NULL-terminated list of more pads to select on.
2269 * Waits for a buffer on the given set of pads.
2271 * Returns: the #GstPad that has a buffer available.
2272 * Use #gst_pad_pull() to get the buffer.
2275 gst_pad_selectv (GstPad *pad, ...)
2278 GList *padlist = NULL;
2284 va_start (var_args, pad);
2287 padlist = g_list_prepend (padlist, pad);
2288 pad = va_arg (var_args, GstPad *);
2290 result = gst_pad_select (padlist);
2291 g_list_free (padlist);
2298 /************************************************************************
2303 static void gst_pad_template_class_init (GstPadTemplateClass *klass);
2304 static void gst_pad_template_init (GstPadTemplate *templ);
2307 gst_pad_template_get_type (void)
2309 static GType padtemplate_type = 0;
2311 if (!padtemplate_type) {
2312 static const GTypeInfo padtemplate_info = {
2313 sizeof (GstPadTemplateClass), NULL, NULL,
2314 (GClassInitFunc) gst_pad_template_class_init, NULL, NULL,
2315 sizeof (GstPadTemplate),
2317 (GInstanceInitFunc) gst_pad_template_init, NULL
2319 padtemplate_type = g_type_register_static(GST_TYPE_OBJECT, "GstPadTemplate",
2320 &padtemplate_info, 0);
2322 return padtemplate_type;
2326 gst_pad_template_class_init (GstPadTemplateClass *klass)
2328 GObjectClass *gobject_class;
2329 GstObjectClass *gstobject_class;
2331 gobject_class = (GObjectClass*) klass;
2332 gstobject_class = (GstObjectClass*) klass;
2334 padtemplate_parent_class = g_type_class_ref (GST_TYPE_OBJECT);
2336 gst_pad_template_signals[TEMPL_PAD_CREATED] =
2337 g_signal_new ("pad_created", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
2338 G_STRUCT_OFFSET (GstPadTemplateClass, pad_created),
2339 NULL, NULL, gst_marshal_VOID__POINTER, G_TYPE_NONE, 1,
2342 gstobject_class->path_string_separator = "*";
2346 gst_pad_template_init (GstPadTemplate *templ)
2350 /* ALWAYS padtemplates cannot have conversion specifications, it doesn't make
2352 * SOMETIMES padtemplates can do whatever they want, they are provided by the
2354 * REQUEST padtemplates can be reverse-parsed (the user asks for 'sink1', the
2355 * 'sink%d' template is automatically selected), so we need to restrict their
2359 name_is_valid (const gchar *name, GstPadPresence presence)
2363 if (presence == GST_PAD_ALWAYS) {
2364 if (strchr (name, '%')) {
2365 g_warning ("invalid name template %s: conversion specifications are not"
2366 " allowed for GST_PAD_ALWAYS padtemplates", name);
2369 } else if (presence == GST_PAD_REQUEST) {
2370 if ((str = strchr (name, '%')) && strchr (str + 1, '%')) {
2371 g_warning ("invalid name template %s: only one conversion specification"
2372 " allowed in GST_PAD_REQUEST padtemplate", name);
2375 if (str && (*(str+1) != 's' && *(str+1) != 'd')) {
2376 g_warning ("invalid name template %s: conversion specification must be of"
2377 " type '%%d' or '%%s' for GST_PAD_REQUEST padtemplate", name);
2380 if (str && (*(str+2) != '\0')) {
2381 g_warning ("invalid name template %s: conversion specification must"
2382 " appear at the end of the GST_PAD_REQUEST padtemplate name",
2392 * gst_pad_template_new:
2393 * @name_template: the name template.
2394 * @direction: the #GstPadDirection of the template.
2395 * @presence: the #GstPadPresence of the pad.
2396 * @caps: a #GstCaps set for the template.
2397 * @...: a NULL-terminated list of #GstCaps.
2399 * Creates a new pad template with a name according to the given template
2400 * and with the given arguments.
2402 * Returns: a new #GstPadTemplate.
2405 gst_pad_template_new (const gchar *name_template,
2406 GstPadDirection direction, GstPadPresence presence,
2409 GstPadTemplate *new;
2411 GstCaps *thecaps = NULL;
2413 g_return_val_if_fail (name_template != NULL, NULL);
2415 if (!name_is_valid (name_template, presence))
2418 new = g_object_new (gst_pad_template_get_type (),
2419 "name", name_template,
2422 GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (name_template);
2423 GST_PAD_TEMPLATE_DIRECTION (new) = direction;
2424 GST_PAD_TEMPLATE_PRESENCE (new) = presence;
2426 va_start (var_args, caps);
2429 new->fixed &= caps->fixed;
2430 thecaps = gst_caps_append (thecaps, gst_caps_ref (caps));
2431 caps = va_arg (var_args, GstCaps*);
2435 GST_PAD_TEMPLATE_CAPS (new) = thecaps;
2441 * gst_pad_template_get_caps:
2442 * @templ: a #GstPadTemplate to get capabilities of.
2444 * Gets the capabilities of the pad template.
2446 * Returns: the #GstCaps of the pad template.
2449 gst_pad_template_get_caps (GstPadTemplate *templ)
2451 g_return_val_if_fail (templ != NULL, NULL);
2453 return GST_PAD_TEMPLATE_CAPS (templ);
2457 * gst_pad_set_element_private:
2458 * @pad: the #GstPad to set the private data of.
2459 * @priv: The private data to attach to the pad.
2461 * Set the given private data gpointer on the pad.
2462 * This function can only be used by the element that owns the pad.
2465 gst_pad_set_element_private (GstPad *pad, gpointer priv)
2467 pad->element_private = priv;
2471 * gst_pad_get_element_private:
2472 * @pad: the #GstPad to get the private data of.
2474 * Gets the private data of a pad.
2476 * Returns: a #gpointer to the private data.
2479 gst_pad_get_element_private (GstPad *pad)
2481 return pad->element_private;
2485 /***** ghost pads *****/
2486 GType _gst_ghost_pad_type = 0;
2488 static void gst_ghost_pad_class_init (GstGhostPadClass *klass);
2489 static void gst_ghost_pad_init (GstGhostPad *pad);
2491 static GstPad *ghost_pad_parent_class = NULL;
2492 /* static guint gst_ghost_pad_signals[LAST_SIGNAL] = { 0 }; */
2495 gst_ghost_pad_get_type (void)
2497 if (!_gst_ghost_pad_type) {
2498 static const GTypeInfo pad_info = {
2499 sizeof (GstGhostPadClass), NULL, NULL,
2500 (GClassInitFunc) gst_ghost_pad_class_init, NULL, NULL,
2501 sizeof (GstGhostPad),
2503 (GInstanceInitFunc) gst_ghost_pad_init,
2506 _gst_ghost_pad_type = g_type_register_static (GST_TYPE_PAD, "GstGhostPad",
2509 return _gst_ghost_pad_type;
2513 gst_ghost_pad_class_init (GstGhostPadClass *klass)
2515 GObjectClass *gobject_class;
2517 gobject_class = (GObjectClass*) klass;
2519 ghost_pad_parent_class = g_type_class_ref (GST_TYPE_PAD);
2523 gst_ghost_pad_init (GstGhostPad *pad)
2525 pad->realpad = NULL;
2529 * gst_ghost_pad_new:
2530 * @name: the name of the new ghost pad.
2531 * @pad: the #GstPad to create a ghost pad for.
2533 * Creates a new ghost pad associated with the given pad, and names it with
2534 * the given name. If name is NULL, a guaranteed unique name (across all
2535 * ghost pads) will be assigned (most likely of the form ghostpad&perc;d).
2537 * Returns: a new ghost #GstPad, or NULL in case of an error.
2541 gst_ghost_pad_new (const gchar *name,
2544 GstGhostPad *ghostpad;
2545 GstRealPad *realpad;
2547 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2549 ghostpad = g_object_new (gst_ghost_pad_get_type () ,NULL);
2550 gst_pad_set_name (GST_PAD (ghostpad), name);
2552 realpad = (GstRealPad *) pad;
2554 while (!GST_IS_REAL_PAD (realpad)) {
2555 realpad = GST_PAD_REALIZE (realpad);
2557 GST_GPAD_REALPAD (ghostpad) = realpad;
2558 GST_PAD_PAD_TEMPLATE (ghostpad) = GST_PAD_PAD_TEMPLATE (pad);
2560 /* add ourselves to the real pad's list of ghostpads */
2561 gst_pad_add_ghost_pad (pad, GST_PAD (ghostpad));
2563 /* FIXME need to ref the real pad here... ? */
2565 GST_DEBUG (GST_CAT_PADS, "created ghost pad \"%s\"",
2566 gst_pad_get_name (GST_PAD (ghostpad)));
2568 return GST_PAD (ghostpad);
2572 * gst_pad_get_internal_connections_default:
2573 * @pad: the #GstPad to get the internal connections of.
2575 * Gets a list of pads to which the given pad is connected to
2576 * inside of the parent element.
2577 * This is the default handler, and thus returns a list of all of the
2578 * pads inside the parent element with opposite direction.
2579 * The caller must free this list after use.
2581 * Returns: a newly allocated #GList of pads.
2584 gst_pad_get_internal_connections_default (GstPad *pad)
2589 GstPadDirection direction;
2592 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2594 rpad = GST_PAD_REALIZE (pad);
2595 direction = rpad->direction;
2597 parent = GST_PAD_PARENT (rpad);
2598 parent_pads = parent->pads;
2600 while (parent_pads) {
2601 GstRealPad *parent_pad = GST_PAD_REALIZE (parent_pads->data);
2603 if (parent_pad->direction != direction) {
2604 res = g_list_prepend (res, parent_pad);
2607 parent_pads = g_list_next (parent_pads);
2614 * gst_pad_get_internal_connections:
2615 * @pad: the #GstPad to get the internal connections of.
2617 * Gets a list of pads to which the given pad is connected to
2618 * inside of the parent element.
2619 * The caller must free this list after use.
2621 * Returns: a newly allocated #GList of pads.
2624 gst_pad_get_internal_connections (GstPad *pad)
2629 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2631 rpad = GST_PAD_REALIZE (pad);
2633 if (GST_RPAD_INTCONNFUNC (rpad))
2634 res = GST_RPAD_INTCONNFUNC (rpad) (GST_PAD_CAST (rpad));
2641 gst_pad_event_default_dispatch (GstPad *pad, GstElement *element,
2644 GList *pads = element->pads;
2647 GstPad *eventpad = GST_PAD (pads->data);
2648 pads = g_list_next (pads);
2650 /* for all pads in the opposite direction that are connected */
2651 if (GST_PAD_DIRECTION (eventpad) != GST_PAD_DIRECTION (pad)
2652 && GST_PAD_IS_CONNECTED (eventpad)) {
2653 if (GST_PAD_DIRECTION (eventpad) == GST_PAD_SRC) {
2654 /* increase the refcount */
2655 gst_event_ref (event);
2656 gst_pad_push (eventpad, GST_BUFFER (event));
2659 GstPad *peerpad = GST_PAD_CAST (GST_RPAD_PEER (eventpad));
2661 /* we only send the event on one pad, multi-sinkpad elements
2662 * should implement a handler */
2663 return gst_pad_send_event (peerpad, event);
2667 gst_event_unref (event);
2672 * gst_pad_event_default:
2673 * @pad: a #GstPad to call the default event handler on.
2674 * @event: the #GstEvent to handle.
2676 * Invokes the default event handler for the given pad.
2678 * Returns: TRUE if the event was sent succesfully.
2681 gst_pad_event_default (GstPad *pad, GstEvent *event)
2683 GstElement *element;
2685 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2686 g_return_val_if_fail (event, FALSE);
2688 element = GST_PAD_PARENT (pad);
2690 switch (GST_EVENT_TYPE (event)) {
2692 gst_pad_event_default_dispatch (pad, element, event);
2693 gst_element_set_eos (element);
2694 /* we have to try to schedule another element
2695 * because this one is disabled */
2696 gst_element_yield (element);
2698 case GST_EVENT_DISCONTINUOUS:
2702 if (gst_event_discont_get_value (event, GST_FORMAT_TIME, &time)) {
2703 if (gst_element_requires_clock (element) && element->clock) {
2704 gst_clock_handle_discont (element->clock, time);
2708 case GST_EVENT_FLUSH:
2710 return gst_pad_event_default_dispatch (pad, element, event);
2716 * gst_pad_dispatcher:
2717 * @pad: a #GstPad to dispatch.
2718 * @dispatch: the #GstDispatcherFunction to call.
2719 * @data: gpointer user data passed to the dispatcher function.
2721 * Invokes the given dispatcher function on all pads that are
2722 * internally connected to the given pad.
2723 * The GstPadDispatcherFunction should return TRUE when no further pads
2724 * need to be processed.
2726 * Returns: TRUE if one of the dispatcher functions returned TRUE.
2729 gst_pad_dispatcher (GstPad *pad, GstPadDispatcherFunction dispatch,
2732 gboolean res = FALSE;
2733 GList *int_pads, *orig;
2735 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2736 g_return_val_if_fail (data, FALSE);
2738 orig = int_pads = gst_pad_get_internal_connections (pad);
2741 GstRealPad *int_rpad = GST_PAD_REALIZE (int_pads->data);
2742 GstRealPad *int_peer = GST_RPAD_PEER (int_rpad);
2745 res = dispatch (GST_PAD_CAST (int_peer), data);
2749 int_pads = g_list_next (int_pads);
2758 * gst_pad_send_event:
2759 * @pad: a #GstPad to send the event to.
2760 * @event: the #GstEvent to send to the pad.
2762 * Sends the event to the pad.
2764 * Returns: TRUE if the event was handled.
2767 gst_pad_send_event (GstPad *pad, GstEvent *event)
2769 gboolean success = FALSE;
2772 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2773 g_return_val_if_fail (event, FALSE);
2775 rpad = GST_PAD_REALIZE (pad);
2777 if (GST_EVENT_SRC (event) == NULL)
2778 GST_EVENT_SRC (event) = gst_object_ref (GST_OBJECT (rpad));
2780 GST_DEBUG (GST_CAT_EVENT, "have event %d on pad %s:%s",
2781 GST_EVENT_TYPE (event), GST_DEBUG_PAD_NAME (rpad));
2783 if (GST_RPAD_EVENTFUNC (rpad))
2784 success = GST_RPAD_EVENTFUNC (rpad) (GST_PAD_CAST (rpad), event);
2786 GST_DEBUG (GST_CAT_EVENT, "there's no event function for pad %s:%s",
2787 GST_DEBUG_PAD_NAME (rpad));
2788 gst_event_unref (event);
2796 GstFormat src_format;
2798 GstFormat *dest_format;
2800 } GstPadConvertData;
2803 gst_pad_convert_dispatcher (GstPad *pad, GstPadConvertData *data)
2805 return gst_pad_convert (pad, data->src_format, data->src_value,
2806 data->dest_format, data->dest_value);
2810 * gst_pad_convert_default:
2811 * @pad: a #GstPad to invoke the default converter on.
2812 * @src_format: the source #GstFormat.
2813 * @src_value: the source value.
2814 * @dest_format: a pointer to the destination #GstFormat.
2815 * @dest_value: a pointer to the destination value.
2817 * Invokes the default converter on a pad.
2818 * This will forward the call to the pad obtained
2819 * using the internal connection of
2822 * Returns: TRUE if the conversion could be performed.
2825 gst_pad_convert_default (GstPad *pad,
2826 GstFormat src_format, gint64 src_value,
2827 GstFormat *dest_format, gint64 *dest_value)
2829 GstPadConvertData data;
2831 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2832 g_return_val_if_fail (dest_format, FALSE);
2833 g_return_val_if_fail (dest_value, FALSE);
2835 data.src_format = src_format;
2836 data.src_value = src_value;
2837 data.dest_format = dest_format;
2838 data.dest_value = dest_value;
2840 return gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
2841 gst_pad_convert_dispatcher, &data);
2846 * @pad: a #GstPad to invoke the default converter on.
2847 * @src_format: the source #GstFormat.
2848 * @src_value: the source value.
2849 * @dest_format: a pointer to the destination #GstFormat.
2850 * @dest_value: a pointer to the destination value.
2852 * Invokes a conversion on the pad.
2854 * Returns: TRUE if the conversion could be performed.
2857 gst_pad_convert (GstPad *pad,
2858 GstFormat src_format, gint64 src_value,
2859 GstFormat *dest_format, gint64 *dest_value)
2863 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2864 g_return_val_if_fail (dest_format, FALSE);
2865 g_return_val_if_fail (dest_value, FALSE);
2867 if (src_format == *dest_format) {
2868 *dest_value = src_value;
2872 rpad = GST_PAD_REALIZE (pad);
2874 if (GST_RPAD_CONVERTFUNC (rpad)) {
2875 return GST_RPAD_CONVERTFUNC (rpad) (GST_PAD_CAST (rpad), src_format,
2876 src_value, dest_format, dest_value);
2890 gst_pad_query_dispatcher (GstPad *pad, GstPadQueryData *data)
2892 return gst_pad_query (pad, data->type, data->format, data->value);
2896 * gst_pad_query_default:
2897 * @pad: a #GstPad to invoke the default query on.
2898 * @type: the #GstQueryType of the query to perform.
2899 * @format: a pointer to the #GstFormat of the result.
2900 * @value: a pointer to the result.
2902 * Invokes the default query function on a pad.
2904 * Returns: TRUE if the query could be performed.
2907 gst_pad_query_default (GstPad *pad, GstQueryType type,
2908 GstFormat *format, gint64 *value)
2910 GstPadQueryData data;
2912 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2913 g_return_val_if_fail (format, FALSE);
2914 g_return_val_if_fail (value, FALSE);
2917 data.format = format;
2920 return gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
2921 gst_pad_query_dispatcher, &data);
2926 * @pad: a #GstPad to invoke the default query on.
2927 * @type: the #GstQueryType of the query to perform.
2928 * @format: a pointer to the #GstFormat of the result.
2929 * @value: a pointer to the result.
2931 * Queries a pad for one of the available properties.
2933 * Returns: TRUE if the query could be performed.
2936 gst_pad_query (GstPad *pad, GstQueryType type,
2937 GstFormat *format, gint64 *value)
2941 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2942 g_return_val_if_fail (format, FALSE);
2943 g_return_val_if_fail (value, FALSE);
2945 rpad = GST_PAD_REALIZE (pad);
2947 g_return_val_if_fail (rpad, FALSE);
2949 if (GST_RPAD_QUERYFUNC (rpad))
2950 return GST_RPAD_QUERYFUNC (rpad) (GST_PAD_CAST (pad), type, format, value);
2956 gst_pad_get_formats_dispatcher (GstPad *pad, const GstFormat **data)
2958 *data = gst_pad_get_formats (pad);
2964 * gst_pad_get_formats_default:
2965 * @pad: a #GstPad to query
2967 * Invoke the default format dispatcher for the pad.
2969 * Returns: An array of GstFormats ended with a 0 value.
2972 gst_pad_get_formats_default (GstPad *pad)
2974 GstFormat *result = NULL;
2976 gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
2977 gst_pad_get_formats_dispatcher, &result);
2983 * gst_pad_get_formats:
2984 * @pad: a #GstPad to query
2986 * Gets the list of supported formats from the pad.
2988 * Returns: An array of GstFormats ended with a 0 value.
2991 gst_pad_get_formats (GstPad *pad)
2995 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2997 rpad = GST_PAD_REALIZE (pad);
2999 if (GST_RPAD_FORMATSFUNC (rpad))
3000 return GST_RPAD_FORMATSFUNC (rpad) (GST_PAD_CAST (pad));