2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
5 * gstpad.c: Pads for linking 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., 51 Franklin St, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
24 * @short_description: Object contained by elements that allows links to
26 * @see_also: #GstPadTemplate, #GstElement, #GstEvent, #GstQuery, #GstBuffer
28 * A #GstElement is linked to other elements via "pads", which are extremely
29 * light-weight generic link points.
31 * Pads have a #GstPadDirection, source pads produce data, sink pads consume
34 * Pads are typically created from a #GstPadTemplate with
35 * gst_pad_new_from_template() and are then added to a #GstElement. This usually
36 * happens when the element is created but it can also happen dynamically based
37 * on the data that the element is processing or based on the pads that the
38 * application requests.
40 * Pads without pad templates can be created with gst_pad_new(),
41 * which takes a direction and a name as an argument. If the name is %NULL,
42 * then a guaranteed unique name will be assigned to it.
44 * A #GstElement creating a pad will typically use the various
45 * gst_pad_set_*_function() calls to register callbacks for events, queries or
46 * dataflow on the pads.
48 * gst_pad_get_parent() will retrieve the #GstElement that owns the pad.
50 * After two pads are retrieved from an element by gst_element_get_static_pad(),
51 * the pads can be linked with gst_pad_link(). (For quick links,
52 * you can also use gst_element_link(), which will make the obvious
53 * link for you if it's straightforward.). Pads can be unlinked again with
54 * gst_pad_unlink(). gst_pad_get_peer() can be used to check what the pad is
57 * Before dataflow is possible on the pads, they need to be activated with
58 * gst_pad_set_active().
60 * gst_pad_query() and gst_pad_peer_query() can be used to query various
61 * properties of the pad and the stream.
63 * To send a #GstEvent on a pad, use gst_pad_send_event() and
64 * gst_pad_push_event(). Some events will be sticky on the pad, meaning that
65 * after they pass on the pad they can be queried later with
66 * gst_pad_get_sticky_event() and gst_pad_sticky_events_foreach().
67 * gst_pad_get_current_caps() and gst_pad_has_current_caps() are convenience
68 * functions to query the current sticky CAPS event on a pad.
70 * GstElements will use gst_pad_push() and gst_pad_pull_range() to push out
71 * or pull in a buffer.
73 * The dataflow, events and queries that happen on a pad can be monitored with
74 * probes that can be installed with gst_pad_add_probe(). gst_pad_is_blocked()
75 * can be used to check if a block probe is installed on the pad.
76 * gst_pad_is_blocking() checks if the blocking probe is currently blocking the
77 * pad. gst_pad_remove_probe() is used to remove a previously installed probe
78 * and unblock blocking probes if any.
80 * Pad have an offset that can be retrieved with gst_pad_get_offset(). This
81 * offset will be applied to the running_time of all data passing over the pad.
82 * gst_pad_set_offset() can be used to change the offset.
84 * Convenience functions exist to start, pause and stop the task on a pad with
85 * gst_pad_start_task(), gst_pad_pause_task() and gst_pad_stop_task()
89 #include "gst_private.h"
92 #include "gstpadtemplate.h"
93 #include "gstenumtypes.h"
98 #include "glib-compat-private.h"
100 GST_DEBUG_CATEGORY_STATIC (debug_dataflow);
101 #define GST_CAT_DEFAULT GST_CAT_PADS
103 /* Pad signals and args */
122 #define GST_PAD_GET_PRIVATE(obj) \
123 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_PAD, GstPadPrivate))
125 /* we have a pending and an active event on the pad. On source pads only the
126 * active event is used. On sinkpads, events are copied to the pending entry and
127 * moved to the active event when the eventfunc returned %TRUE. */
134 struct _GstPadPrivate
141 guint probe_list_cookie;
151 #define PROBE_COOKIE(h) (((GstProbe *)(h))->cookie)
156 GstPadProbeInfo *info;
163 static void gst_pad_dispose (GObject * object);
164 static void gst_pad_finalize (GObject * object);
165 static void gst_pad_set_property (GObject * object, guint prop_id,
166 const GValue * value, GParamSpec * pspec);
167 static void gst_pad_get_property (GObject * object, guint prop_id,
168 GValue * value, GParamSpec * pspec);
170 static void gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ);
171 static gboolean gst_pad_activate_default (GstPad * pad, GstObject * parent);
172 static GstFlowReturn gst_pad_chain_list_default (GstPad * pad,
173 GstObject * parent, GstBufferList * list);
175 static GstFlowReturn gst_pad_send_event_unchecked (GstPad * pad,
176 GstEvent * event, GstPadProbeType type);
177 static GstFlowReturn gst_pad_push_event_unchecked (GstPad * pad,
178 GstEvent * event, GstPadProbeType type);
180 static guint gst_pad_signals[LAST_SIGNAL] = { 0 };
182 static GParamSpec *pspec_caps = NULL;
184 /* quarks for probe signals */
185 static GQuark buffer_quark;
186 static GQuark buffer_list_quark;
187 static GQuark event_quark;
196 static GstFlowQuarks flow_quarks[] = {
197 {GST_FLOW_CUSTOM_SUCCESS, "custom-success", 0},
198 {GST_FLOW_OK, "ok", 0},
199 {GST_FLOW_NOT_LINKED, "not-linked", 0},
200 {GST_FLOW_FLUSHING, "flushing", 0},
201 {GST_FLOW_EOS, "eos", 0},
202 {GST_FLOW_NOT_NEGOTIATED, "not-negotiated", 0},
203 {GST_FLOW_ERROR, "error", 0},
204 {GST_FLOW_NOT_SUPPORTED, "not-supported", 0},
205 {GST_FLOW_CUSTOM_ERROR, "custom-error", 0}
210 * @ret: a #GstFlowReturn to get the name of.
212 * Gets a string representing the given flow return.
214 * Returns: a static string with the name of the flow return.
217 gst_flow_get_name (GstFlowReturn ret)
221 ret = CLAMP (ret, GST_FLOW_CUSTOM_ERROR, GST_FLOW_CUSTOM_SUCCESS);
223 for (i = 0; i < G_N_ELEMENTS (flow_quarks); i++) {
224 if (ret == flow_quarks[i].ret)
225 return flow_quarks[i].name;
232 * @ret: a #GstFlowReturn to get the quark of.
234 * Get the unique quark for the given GstFlowReturn.
236 * Returns: the quark associated with the flow return or 0 if an
237 * invalid return was specified.
240 gst_flow_to_quark (GstFlowReturn ret)
244 ret = CLAMP (ret, GST_FLOW_CUSTOM_ERROR, GST_FLOW_CUSTOM_SUCCESS);
246 for (i = 0; i < G_N_ELEMENTS (flow_quarks); i++) {
247 if (ret == flow_quarks[i].ret)
248 return flow_quarks[i].quark;
254 * gst_pad_link_get_name:
255 * @ret: a #GstPadLinkReturn to get the name of.
257 * Gets a string representing the given pad-link return.
259 * Returns: a static string with the name of the pad-link return.
264 gst_pad_link_get_name (GstPadLinkReturn ret)
267 case GST_PAD_LINK_OK:
269 case GST_PAD_LINK_WRONG_HIERARCHY:
270 return "wrong hierarchy";
271 case GST_PAD_LINK_WAS_LINKED:
273 case GST_PAD_LINK_WRONG_DIRECTION:
274 return "wrong direction";
275 case GST_PAD_LINK_NOFORMAT:
276 return "no common format";
277 case GST_PAD_LINK_NOSCHED:
278 return "incompatible scheduling";
279 case GST_PAD_LINK_REFUSED:
282 g_return_val_if_reached ("unknown");
289 buffer_quark = g_quark_from_static_string ("buffer"); \
290 buffer_list_quark = g_quark_from_static_string ("bufferlist"); \
291 event_quark = g_quark_from_static_string ("event"); \
293 for (i = 0; i < G_N_ELEMENTS (flow_quarks); i++) { \
294 flow_quarks[i].quark = g_quark_from_static_string (flow_quarks[i].name); \
297 GST_DEBUG_CATEGORY_INIT (debug_dataflow, "GST_DATAFLOW", \
298 GST_DEBUG_BOLD | GST_DEBUG_FG_GREEN, "dataflow inside pads"); \
301 #define gst_pad_parent_class parent_class
302 G_DEFINE_TYPE_WITH_CODE (GstPad, gst_pad, GST_TYPE_OBJECT, _do_init);
305 gst_pad_class_init (GstPadClass * klass)
307 GObjectClass *gobject_class;
308 GstObjectClass *gstobject_class;
310 gobject_class = G_OBJECT_CLASS (klass);
311 gstobject_class = GST_OBJECT_CLASS (klass);
313 g_type_class_add_private (klass, sizeof (GstPadPrivate));
315 gobject_class->dispose = gst_pad_dispose;
316 gobject_class->finalize = gst_pad_finalize;
317 gobject_class->set_property = gst_pad_set_property;
318 gobject_class->get_property = gst_pad_get_property;
322 * @pad: the pad that emitted the signal
323 * @peer: the peer pad that has been connected
325 * Signals that a pad has been linked to the peer pad.
327 gst_pad_signals[PAD_LINKED] =
328 g_signal_new ("linked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
329 G_STRUCT_OFFSET (GstPadClass, linked), NULL, NULL,
330 g_cclosure_marshal_generic, G_TYPE_NONE, 1, GST_TYPE_PAD);
333 * @pad: the pad that emitted the signal
334 * @peer: the peer pad that has been disconnected
336 * Signals that a pad has been unlinked from the peer pad.
338 gst_pad_signals[PAD_UNLINKED] =
339 g_signal_new ("unlinked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
340 G_STRUCT_OFFSET (GstPadClass, unlinked), NULL, NULL,
341 g_cclosure_marshal_generic, G_TYPE_NONE, 1, GST_TYPE_PAD);
343 pspec_caps = g_param_spec_boxed ("caps", "Caps",
344 "The capabilities of the pad", GST_TYPE_CAPS,
345 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
346 g_object_class_install_property (gobject_class, PAD_PROP_CAPS, pspec_caps);
348 g_object_class_install_property (gobject_class, PAD_PROP_DIRECTION,
349 g_param_spec_enum ("direction", "Direction", "The direction of the pad",
350 GST_TYPE_PAD_DIRECTION, GST_PAD_UNKNOWN,
351 G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
353 /* FIXME, Make G_PARAM_CONSTRUCT_ONLY when we fix ghostpads. */
354 g_object_class_install_property (gobject_class, PAD_PROP_TEMPLATE,
355 g_param_spec_object ("template", "Template",
356 "The GstPadTemplate of this pad", GST_TYPE_PAD_TEMPLATE,
357 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
362 * The offset that will be applied to the running time of the pad.
366 g_object_class_install_property (gobject_class, PAD_PROP_OFFSET,
367 g_param_spec_int64 ("offset", "Offset",
368 "The running time offset of the pad", 0, G_MAXINT64, 0,
369 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
371 gstobject_class->path_string_separator = ".";
373 /* Register common function pointer descriptions */
374 GST_DEBUG_REGISTER_FUNCPTR (gst_pad_activate_default);
375 GST_DEBUG_REGISTER_FUNCPTR (gst_pad_event_default);
376 GST_DEBUG_REGISTER_FUNCPTR (gst_pad_query_default);
377 GST_DEBUG_REGISTER_FUNCPTR (gst_pad_iterate_internal_links_default);
378 GST_DEBUG_REGISTER_FUNCPTR (gst_pad_chain_list_default);
382 gst_pad_init (GstPad * pad)
384 pad->priv = GST_PAD_GET_PRIVATE (pad);
386 GST_PAD_DIRECTION (pad) = GST_PAD_UNKNOWN;
388 GST_PAD_ACTIVATEFUNC (pad) = gst_pad_activate_default;
389 GST_PAD_EVENTFUNC (pad) = gst_pad_event_default;
390 GST_PAD_QUERYFUNC (pad) = gst_pad_query_default;
391 GST_PAD_ITERINTLINKFUNC (pad) = gst_pad_iterate_internal_links_default;
392 GST_PAD_CHAINLISTFUNC (pad) = gst_pad_chain_list_default;
394 GST_PAD_SET_FLUSHING (pad);
396 g_rec_mutex_init (&pad->stream_rec_lock);
398 g_cond_init (&pad->block_cond);
400 g_hook_list_init (&pad->probes, sizeof (GstProbe));
402 pad->priv->events = g_array_sized_new (FALSE, TRUE, sizeof (PadEvent), 16);
403 pad->priv->events_cookie = 0;
404 pad->priv->last_cookie = -1;
405 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
408 /* called when setting the pad inactive. It removes all sticky events from
409 * the pad. must be called with object lock */
411 remove_events (GstPad * pad)
415 gboolean notify = FALSE;
417 events = pad->priv->events;
420 for (i = 0; i < len; i++) {
421 PadEvent *ev = &g_array_index (events, PadEvent, i);
422 GstEvent *event = ev->event;
426 if (event && GST_EVENT_TYPE (event) == GST_EVENT_CAPS)
429 gst_event_unref (event);
432 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PENDING_EVENTS);
433 g_array_set_size (events, 0);
434 pad->priv->events_cookie++;
437 GST_OBJECT_UNLOCK (pad);
439 GST_DEBUG_OBJECT (pad, "notify caps");
440 g_object_notify_by_pspec ((GObject *) pad, pspec_caps);
442 GST_OBJECT_LOCK (pad);
446 /* should be called with object lock */
448 find_event_by_type (GstPad * pad, GstEventType type, guint idx)
454 events = pad->priv->events;
457 for (i = 0; i < len; i++) {
458 ev = &g_array_index (events, PadEvent, i);
459 if (ev->event == NULL)
462 if (GST_EVENT_TYPE (ev->event) == type) {
473 /* should be called with OBJECT lock */
475 find_event (GstPad * pad, GstEvent * event)
481 events = pad->priv->events;
484 for (i = 0; i < len; i++) {
485 ev = &g_array_index (events, PadEvent, i);
486 if (event == ev->event)
494 /* should be called with OBJECT lock */
496 remove_event_by_type (GstPad * pad, GstEventType type)
502 events = pad->priv->events;
507 ev = &g_array_index (events, PadEvent, i);
508 if (ev->event == NULL)
511 if (GST_EVENT_TYPE (ev->event) != type)
514 gst_event_unref (ev->event);
515 g_array_remove_index (events, i);
517 pad->priv->events_cookie++;
525 /* check all events on srcpad against those on sinkpad. All events that are not
526 * on sinkpad are marked as received=%FALSE and the PENDING_EVENTS is set on the
527 * srcpad so that the events will be sent next time */
528 /* should be called with srcpad and sinkpad LOCKS */
530 schedule_events (GstPad * srcpad, GstPad * sinkpad)
535 gboolean pending = FALSE;
537 events = srcpad->priv->events;
540 for (i = 0; i < len; i++) {
541 ev = &g_array_index (events, PadEvent, i);
542 if (ev->event == NULL)
545 if (sinkpad == NULL || !find_event (sinkpad, ev->event)) {
546 ev->received = FALSE;
551 GST_OBJECT_FLAG_SET (srcpad, GST_PAD_FLAG_PENDING_EVENTS);
554 typedef gboolean (*PadEventFunction) (GstPad * pad, PadEvent * ev,
557 /* should be called with pad LOCK */
559 events_foreach (GstPad * pad, PadEventFunction func, gpointer user_data)
566 events = pad->priv->events;
569 cookie = pad->priv->events_cookie;
573 PadEvent *ev, ev_ret;
575 ev = &g_array_index (events, PadEvent, i);
576 if (G_UNLIKELY (ev->event == NULL))
579 /* take aditional ref, func might release the lock */
580 ev_ret.event = gst_event_ref (ev->event);
581 ev_ret.received = ev->received;
583 ret = func (pad, &ev_ret, user_data);
585 /* recheck the cookie, lock might have been released and the list could have
587 if (G_UNLIKELY (cookie != pad->priv->events_cookie)) {
588 if (G_LIKELY (ev_ret.event))
589 gst_event_unref (ev_ret.event);
593 /* store the received state */
594 ev->received = ev_ret.received;
596 /* if the event changed, we need to do something */
597 if (G_UNLIKELY (ev->event != ev_ret.event)) {
598 if (G_UNLIKELY (ev_ret.event == NULL)) {
599 /* function unreffed and set the event to NULL, remove it */
600 gst_event_unref (ev->event);
601 g_array_remove_index (events, i);
603 cookie = ++pad->priv->events_cookie;
606 /* function gave a new event for us */
607 gst_event_take (&ev->event, ev_ret.event);
610 /* just unref, nothing changed */
611 gst_event_unref (ev_ret.event);
620 /* should be called with LOCK */
622 _apply_pad_offset (GstPad * pad, GstEvent * event, gboolean upstream)
626 GST_DEBUG_OBJECT (pad, "apply pad offset %" GST_TIME_FORMAT,
627 GST_TIME_ARGS (pad->offset));
629 if (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
632 g_assert (!upstream);
634 /* copy segment values */
635 gst_event_copy_segment (event, &segment);
636 gst_event_unref (event);
638 gst_segment_offset_running_time (&segment, segment.format, pad->offset);
639 event = gst_event_new_segment (&segment);
642 event = gst_event_make_writable (event);
643 offset = gst_event_get_running_time_offset (event);
645 offset -= pad->offset;
647 offset += pad->offset;
648 gst_event_set_running_time_offset (event, offset);
653 static inline GstEvent *
654 apply_pad_offset (GstPad * pad, GstEvent * event, gboolean upstream)
656 if (G_UNLIKELY (pad->offset != 0))
657 return _apply_pad_offset (pad, event, upstream);
662 /* should be called with the OBJECT_LOCK */
664 get_pad_caps (GstPad * pad)
666 GstCaps *caps = NULL;
669 ev = find_event_by_type (pad, GST_EVENT_CAPS, 0);
671 gst_event_parse_caps (ev->event, &caps);
677 gst_pad_dispose (GObject * object)
679 GstPad *pad = GST_PAD_CAST (object);
682 GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pad, "dispose");
684 /* unlink the peer pad */
685 if ((peer = gst_pad_get_peer (pad))) {
686 /* window for MT unsafeness, someone else could unlink here
687 * and then we call unlink with wrong pads. The unlink
688 * function would catch this and safely return failed. */
689 if (GST_PAD_IS_SRC (pad))
690 gst_pad_unlink (pad, peer);
692 gst_pad_unlink (peer, pad);
694 gst_object_unref (peer);
697 gst_pad_set_pad_template (pad, NULL);
699 GST_OBJECT_LOCK (pad);
701 GST_OBJECT_UNLOCK (pad);
703 g_hook_list_clear (&pad->probes);
705 G_OBJECT_CLASS (parent_class)->dispose (object);
709 gst_pad_finalize (GObject * object)
711 GstPad *pad = GST_PAD_CAST (object);
714 /* in case the task is still around, clean it up */
715 if ((task = GST_PAD_TASK (pad))) {
716 gst_task_join (task);
717 GST_PAD_TASK (pad) = NULL;
718 gst_object_unref (task);
721 if (pad->activatenotify)
722 pad->activatenotify (pad->activatedata);
723 if (pad->activatemodenotify)
724 pad->activatemodenotify (pad->activatemodedata);
726 pad->linknotify (pad->linkdata);
727 if (pad->unlinknotify)
728 pad->unlinknotify (pad->unlinkdata);
729 if (pad->chainnotify)
730 pad->chainnotify (pad->chaindata);
731 if (pad->chainlistnotify)
732 pad->chainlistnotify (pad->chainlistdata);
733 if (pad->getrangenotify)
734 pad->getrangenotify (pad->getrangedata);
735 if (pad->eventnotify)
736 pad->eventnotify (pad->eventdata);
737 if (pad->querynotify)
738 pad->querynotify (pad->querydata);
739 if (pad->iterintlinknotify)
740 pad->iterintlinknotify (pad->iterintlinkdata);
742 g_rec_mutex_clear (&pad->stream_rec_lock);
743 g_cond_clear (&pad->block_cond);
744 g_array_free (pad->priv->events, TRUE);
746 G_OBJECT_CLASS (parent_class)->finalize (object);
750 gst_pad_set_property (GObject * object, guint prop_id,
751 const GValue * value, GParamSpec * pspec)
753 g_return_if_fail (GST_IS_PAD (object));
756 case PAD_PROP_DIRECTION:
757 GST_PAD_DIRECTION (object) = (GstPadDirection) g_value_get_enum (value);
759 case PAD_PROP_TEMPLATE:
760 gst_pad_set_pad_template (GST_PAD_CAST (object),
761 (GstPadTemplate *) g_value_get_object (value));
763 case PAD_PROP_OFFSET:
764 gst_pad_set_offset (GST_PAD_CAST (object), g_value_get_int64 (value));
767 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
773 gst_pad_get_property (GObject * object, guint prop_id,
774 GValue * value, GParamSpec * pspec)
776 g_return_if_fail (GST_IS_PAD (object));
780 GST_OBJECT_LOCK (object);
781 g_value_set_boxed (value, get_pad_caps (GST_PAD_CAST (object)));
782 GST_OBJECT_UNLOCK (object);
784 case PAD_PROP_DIRECTION:
785 g_value_set_enum (value, GST_PAD_DIRECTION (object));
787 case PAD_PROP_TEMPLATE:
788 g_value_set_object (value, GST_PAD_PAD_TEMPLATE (object));
790 case PAD_PROP_OFFSET:
791 g_value_set_int64 (value, gst_pad_get_offset (GST_PAD_CAST (object)));
794 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
801 * @name: (allow-none): the name of the new pad.
802 * @direction: the #GstPadDirection of the pad.
804 * Creates a new pad with the given name in the given direction.
805 * If name is %NULL, a guaranteed unique name (across all pads)
807 * This function makes a copy of the name so you can safely free the name.
809 * Returns: (transfer floating) (nullable): a new #GstPad, or %NULL in
815 gst_pad_new (const gchar * name, GstPadDirection direction)
817 return g_object_new (GST_TYPE_PAD,
818 "name", name, "direction", direction, NULL);
822 * gst_pad_new_from_template:
823 * @templ: the pad template to use
824 * @name: (allow-none): the name of the pad
826 * Creates a new pad with the given name from the given template.
827 * If name is %NULL, a guaranteed unique name (across all pads)
829 * This function makes a copy of the name so you can safely free the name.
831 * Returns: (transfer floating) (nullable): a new #GstPad, or %NULL in
835 gst_pad_new_from_template (GstPadTemplate * templ, const gchar * name)
837 g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL);
839 return g_object_new (GST_TYPE_PAD,
840 "name", name, "direction", templ->direction, "template", templ, NULL);
844 * gst_pad_new_from_static_template:
845 * @templ: the #GstStaticPadTemplate to use
846 * @name: the name of the pad
848 * Creates a new pad with the given name from the given static template.
849 * If name is %NULL, a guaranteed unique name (across all pads)
851 * This function makes a copy of the name so you can safely free the name.
853 * Returns: (transfer floating) (nullable): a new #GstPad, or %NULL in
857 gst_pad_new_from_static_template (GstStaticPadTemplate * templ,
861 GstPadTemplate *template;
863 template = gst_static_pad_template_get (templ);
864 pad = gst_pad_new_from_template (template, name);
865 gst_object_unref (template);
869 #define ACQUIRE_PARENT(pad, parent, label) \
871 if (G_LIKELY ((parent = GST_OBJECT_PARENT (pad)))) \
872 gst_object_ref (parent); \
873 else if (G_LIKELY (GST_PAD_NEEDS_PARENT (pad))) \
877 #define RELEASE_PARENT(parent) \
879 if (G_LIKELY (parent)) \
880 gst_object_unref (parent); \
884 * gst_pad_get_direction:
885 * @pad: a #GstPad to get the direction of.
887 * Gets the direction of the pad. The direction of the pad is
888 * decided at construction time so this function does not take
891 * Returns: the #GstPadDirection of the pad.
896 gst_pad_get_direction (GstPad * pad)
898 GstPadDirection result;
900 /* PAD_UNKNOWN is a little silly but we need some sort of
901 * error return value */
902 g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_UNKNOWN);
904 result = GST_PAD_DIRECTION (pad);
910 gst_pad_activate_default (GstPad * pad, GstObject * parent)
912 return gst_pad_activate_mode (pad, GST_PAD_MODE_PUSH, TRUE);
916 * gst_pad_mode_get_name:
917 * @mode: the pad mode
919 * Return the name of a pad mode, for use in debug messages mostly.
921 * Returns: short mnemonic for pad mode @mode
924 gst_pad_mode_get_name (GstPadMode mode)
927 case GST_PAD_MODE_NONE:
929 case GST_PAD_MODE_PUSH:
931 case GST_PAD_MODE_PULL:
940 pre_activate (GstPad * pad, GstPadMode new_mode)
943 case GST_PAD_MODE_NONE:
944 GST_OBJECT_LOCK (pad);
945 GST_DEBUG_OBJECT (pad, "setting PAD_MODE NONE, set flushing");
946 GST_PAD_SET_FLUSHING (pad);
947 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
948 GST_PAD_MODE (pad) = new_mode;
949 /* unlock blocked pads so element can resume and stop */
950 GST_PAD_BLOCK_BROADCAST (pad);
951 GST_OBJECT_UNLOCK (pad);
953 case GST_PAD_MODE_PUSH:
954 case GST_PAD_MODE_PULL:
955 GST_OBJECT_LOCK (pad);
956 GST_DEBUG_OBJECT (pad, "setting pad into %s mode, unset flushing",
957 gst_pad_mode_get_name (new_mode));
958 GST_PAD_UNSET_FLUSHING (pad);
959 pad->ABI.abi.last_flowret = GST_FLOW_OK;
960 GST_PAD_MODE (pad) = new_mode;
961 if (GST_PAD_IS_SINK (pad)) {
963 /* make sure the peer src pad sends us all events */
964 if ((peer = GST_PAD_PEER (pad))) {
965 gst_object_ref (peer);
966 GST_OBJECT_UNLOCK (pad);
968 GST_DEBUG_OBJECT (pad, "reschedule events on peer %s:%s",
969 GST_DEBUG_PAD_NAME (peer));
971 GST_OBJECT_LOCK (peer);
972 schedule_events (peer, NULL);
973 GST_OBJECT_UNLOCK (peer);
975 gst_object_unref (peer);
977 GST_OBJECT_UNLOCK (pad);
980 GST_OBJECT_UNLOCK (pad);
987 post_activate (GstPad * pad, GstPadMode new_mode)
990 case GST_PAD_MODE_NONE:
991 /* ensures that streaming stops */
992 GST_PAD_STREAM_LOCK (pad);
993 GST_DEBUG_OBJECT (pad, "stopped streaming");
994 GST_OBJECT_LOCK (pad);
996 GST_OBJECT_UNLOCK (pad);
997 GST_PAD_STREAM_UNLOCK (pad);
999 case GST_PAD_MODE_PUSH:
1000 case GST_PAD_MODE_PULL:
1007 * gst_pad_set_active:
1008 * @pad: the #GstPad to activate or deactivate.
1009 * @active: whether or not the pad should be active.
1011 * Activates or deactivates the given pad.
1012 * Normally called from within core state change functions.
1014 * If @active, makes sure the pad is active. If it is already active, either in
1015 * push or pull mode, just return. Otherwise dispatches to the pad's activate
1016 * function to perform the actual activation.
1018 * If not @active, calls gst_pad_activate_mode() with the pad's current mode
1019 * and a %FALSE argument.
1021 * Returns: %TRUE if the operation was successful.
1026 gst_pad_set_active (GstPad * pad, gboolean active)
1030 gboolean ret = FALSE;
1032 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1034 GST_OBJECT_LOCK (pad);
1035 old = GST_PAD_MODE (pad);
1036 ACQUIRE_PARENT (pad, parent, no_parent);
1037 GST_OBJECT_UNLOCK (pad);
1040 if (old == GST_PAD_MODE_NONE) {
1041 GST_DEBUG_OBJECT (pad, "activating pad from none");
1042 ret = (GST_PAD_ACTIVATEFUNC (pad)) (pad, parent);
1044 pad->ABI.abi.last_flowret = GST_FLOW_OK;
1046 GST_DEBUG_OBJECT (pad, "pad was active in %s mode",
1047 gst_pad_mode_get_name (old));
1051 if (old == GST_PAD_MODE_NONE) {
1052 GST_DEBUG_OBJECT (pad, "pad was inactive");
1055 GST_DEBUG_OBJECT (pad, "deactivating pad from %s mode",
1056 gst_pad_mode_get_name (old));
1057 ret = gst_pad_activate_mode (pad, old, FALSE);
1059 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
1063 RELEASE_PARENT (parent);
1065 if (G_UNLIKELY (!ret))
1073 GST_DEBUG_OBJECT (pad, "no parent");
1074 GST_OBJECT_UNLOCK (pad);
1079 GST_OBJECT_LOCK (pad);
1081 g_critical ("Failed to deactivate pad %s:%s, very bad",
1082 GST_DEBUG_PAD_NAME (pad));
1084 GST_WARNING_OBJECT (pad, "Failed to activate pad");
1086 GST_OBJECT_UNLOCK (pad);
1092 * gst_pad_activate_mode:
1093 * @pad: the #GstPad to activate or deactivate.
1094 * @mode: the requested activation mode
1095 * @active: whether or not the pad should be active.
1097 * Activates or deactivates the given pad in @mode via dispatching to the
1098 * pad's activatemodefunc. For use from within pad activation functions only.
1100 * If you don't know what this is, you probably don't want to call it.
1102 * Returns: %TRUE if the operation was successful.
1107 gst_pad_activate_mode (GstPad * pad, GstPadMode mode, gboolean active)
1109 gboolean res = FALSE;
1111 GstPadMode old, new;
1112 GstPadDirection dir;
1115 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1117 GST_OBJECT_LOCK (pad);
1118 old = GST_PAD_MODE (pad);
1119 dir = GST_PAD_DIRECTION (pad);
1120 ACQUIRE_PARENT (pad, parent, no_parent);
1121 GST_OBJECT_UNLOCK (pad);
1123 new = active ? mode : GST_PAD_MODE_NONE;
1128 if (active && old != mode && old != GST_PAD_MODE_NONE) {
1129 /* pad was activate in the wrong direction, deactivate it
1130 * and reactivate it in the requested mode */
1131 GST_DEBUG_OBJECT (pad, "deactivating pad from %s mode",
1132 gst_pad_mode_get_name (old));
1134 if (G_UNLIKELY (!gst_pad_activate_mode (pad, old, FALSE)))
1135 goto deactivate_failed;
1139 case GST_PAD_MODE_PULL:
1141 if (dir == GST_PAD_SINK) {
1142 if ((peer = gst_pad_get_peer (pad))) {
1143 GST_DEBUG_OBJECT (pad, "calling peer");
1144 if (G_UNLIKELY (!gst_pad_activate_mode (peer, mode, active)))
1146 gst_object_unref (peer);
1148 /* there is no peer, this is only fatal when we activate. When we
1149 * deactivate, we must assume the application has unlinked the peer and
1150 * will deactivate it eventually. */
1154 GST_DEBUG_OBJECT (pad, "deactivating unlinked pad");
1157 if (G_UNLIKELY (GST_PAD_GETRANGEFUNC (pad) == NULL))
1158 goto failure; /* Can't activate pull on a src without a
1159 getrange function */
1167 /* Mark pad as needing reconfiguration */
1169 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
1170 pre_activate (pad, new);
1172 if (GST_PAD_ACTIVATEMODEFUNC (pad)) {
1173 if (G_UNLIKELY (!GST_PAD_ACTIVATEMODEFUNC (pad) (pad, parent, mode,
1177 /* can happen for sinks of passthrough elements */
1180 post_activate (pad, new);
1182 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "%s in %s mode",
1183 active ? "activated" : "deactivated", gst_pad_mode_get_name (mode));
1188 /* Clear sticky flags on deactivation */
1190 GST_OBJECT_LOCK (pad);
1191 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
1192 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_EOS);
1193 GST_OBJECT_UNLOCK (pad);
1197 RELEASE_PARENT (parent);
1203 GST_DEBUG_OBJECT (pad, "no parent");
1204 GST_OBJECT_UNLOCK (pad);
1209 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "already %s in %s mode",
1210 active ? "activated" : "deactivated", gst_pad_mode_get_name (mode));
1215 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad,
1216 "failed to %s in switch to %s mode from %s mode",
1217 (active ? "activate" : "deactivate"), gst_pad_mode_get_name (mode),
1218 gst_pad_mode_get_name (old));
1223 GST_OBJECT_LOCK (peer);
1224 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad,
1225 "activate_mode on peer (%s:%s) failed", GST_DEBUG_PAD_NAME (peer));
1226 GST_OBJECT_UNLOCK (peer);
1227 gst_object_unref (peer);
1232 GST_CAT_INFO_OBJECT (GST_CAT_PADS, pad, "can't activate unlinked sink "
1233 "pad in pull mode");
1238 GST_OBJECT_LOCK (pad);
1239 GST_CAT_INFO_OBJECT (GST_CAT_PADS, pad, "failed to %s in %s mode",
1240 active ? "activate" : "deactivate", gst_pad_mode_get_name (mode));
1241 GST_PAD_SET_FLUSHING (pad);
1242 GST_PAD_MODE (pad) = old;
1243 GST_OBJECT_UNLOCK (pad);
1249 * gst_pad_is_active:
1250 * @pad: the #GstPad to query
1252 * Query if a pad is active
1254 * Returns: %TRUE if the pad is active.
1259 gst_pad_is_active (GstPad * pad)
1261 gboolean result = FALSE;
1263 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1265 GST_OBJECT_LOCK (pad);
1266 result = GST_PAD_IS_ACTIVE (pad);
1267 GST_OBJECT_UNLOCK (pad);
1273 cleanup_hook (GstPad * pad, GHook * hook)
1275 GstPadProbeType type;
1277 if (!G_HOOK_IS_VALID (hook))
1280 type = (hook->flags) >> G_HOOK_FLAG_USER_SHIFT;
1282 if (type & GST_PAD_PROBE_TYPE_BLOCKING) {
1283 /* unblock when we remove the last blocking probe */
1285 GST_DEBUG_OBJECT (pad, "remove blocking probe, now %d left",
1288 /* Might have new probes now that want to be called */
1289 GST_PAD_BLOCK_BROADCAST (pad);
1291 if (pad->num_blocked == 0) {
1292 GST_DEBUG_OBJECT (pad, "last blocking probe removed, unblocking");
1293 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_BLOCKED);
1296 g_hook_destroy_link (&pad->probes, hook);
1301 * gst_pad_add_probe:
1302 * @pad: the #GstPad to add the probe to
1303 * @mask: the probe mask
1304 * @callback: #GstPadProbeCallback that will be called with notifications of
1306 * @user_data: (closure): user data passed to the callback
1307 * @destroy_data: #GDestroyNotify for user_data
1309 * Be notified of different states of pads. The provided callback is called for
1310 * every state that matches @mask.
1312 * Returns: an id or 0 if no probe is pending. The id can be used to remove the
1313 * probe with gst_pad_remove_probe(). When using GST_PAD_PROBE_TYPE_IDLE it can
1314 * happen that the probe can be run immediately and if the probe returns
1315 * GST_PAD_PROBE_REMOVE this functions returns 0.
1320 gst_pad_add_probe (GstPad * pad, GstPadProbeType mask,
1321 GstPadProbeCallback callback, gpointer user_data,
1322 GDestroyNotify destroy_data)
1327 g_return_val_if_fail (GST_IS_PAD (pad), 0);
1328 g_return_val_if_fail (mask != 0, 0);
1330 GST_OBJECT_LOCK (pad);
1332 /* make a new probe */
1333 hook = g_hook_alloc (&pad->probes);
1335 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "adding probe for mask 0x%08x",
1338 /* when no contraints are given for the types, assume all types are
1340 if ((mask & GST_PAD_PROBE_TYPE_ALL_BOTH) == 0)
1341 mask |= GST_PAD_PROBE_TYPE_ALL_BOTH;
1342 if ((mask & GST_PAD_PROBE_TYPE_SCHEDULING) == 0)
1343 mask |= GST_PAD_PROBE_TYPE_SCHEDULING;
1345 /* store our flags and other fields */
1346 hook->flags |= (mask << G_HOOK_FLAG_USER_SHIFT);
1347 hook->func = callback;
1348 hook->data = user_data;
1349 hook->destroy = destroy_data;
1350 PROBE_COOKIE (hook) = (pad->priv->probe_cookie - 1);
1353 g_hook_prepend (&pad->probes, hook);
1355 /* incremenent cookie so that the new hook get's called */
1356 pad->priv->probe_list_cookie++;
1358 /* get the id of the hook, we return this and it can be used to remove the
1360 res = hook->hook_id;
1362 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "got probe id %lu", res);
1364 if (mask & GST_PAD_PROBE_TYPE_BLOCKING) {
1365 /* we have a block probe */
1367 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_BLOCKED);
1368 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "added blocking probe, "
1369 "now %d blocking probes", pad->num_blocked);
1371 /* Might have new probes now that want to be called */
1372 GST_PAD_BLOCK_BROADCAST (pad);
1375 /* call the callback if we need to be called for idle callbacks */
1376 if ((mask & GST_PAD_PROBE_TYPE_IDLE) && (callback != NULL)) {
1377 if (pad->priv->using > 0) {
1378 /* the pad is in use, we can't signal the idle callback yet. Since we set the
1379 * flag above, the last thread to leave the push will do the callback. New
1380 * threads going into the push will block. */
1381 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
1382 "pad is in use, delay idle callback");
1383 GST_OBJECT_UNLOCK (pad);
1385 GstPadProbeInfo info = { GST_PAD_PROBE_TYPE_IDLE, res, };
1386 GstPadProbeReturn ret;
1388 /* Keep another ref, the callback could destroy the pad */
1389 gst_object_ref (pad);
1391 /* the pad is idle now, we can signal the idle callback now */
1392 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
1393 "pad is idle, trigger idle callback");
1394 GST_OBJECT_UNLOCK (pad);
1396 ret = callback (pad, &info, user_data);
1398 GST_OBJECT_LOCK (pad);
1400 case GST_PAD_PROBE_REMOVE:
1401 /* remove the probe */
1402 GST_DEBUG_OBJECT (pad, "asked to remove hook");
1403 cleanup_hook (pad, hook);
1406 case GST_PAD_PROBE_DROP:
1407 GST_DEBUG_OBJECT (pad, "asked to drop item");
1409 case GST_PAD_PROBE_PASS:
1410 GST_DEBUG_OBJECT (pad, "asked to pass item");
1412 case GST_PAD_PROBE_OK:
1413 GST_DEBUG_OBJECT (pad, "probe returned OK");
1416 GST_DEBUG_OBJECT (pad, "probe returned %d", ret);
1419 GST_OBJECT_UNLOCK (pad);
1421 gst_object_unref (pad);
1424 GST_OBJECT_UNLOCK (pad);
1430 * gst_pad_remove_probe:
1431 * @pad: the #GstPad with the probe
1432 * @id: the probe id to remove
1434 * Remove the probe with @id from @pad.
1439 gst_pad_remove_probe (GstPad * pad, gulong id)
1443 g_return_if_fail (GST_IS_PAD (pad));
1445 GST_OBJECT_LOCK (pad);
1447 hook = g_hook_get (&pad->probes, id);
1451 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "removing hook %ld",
1453 cleanup_hook (pad, hook);
1454 GST_OBJECT_UNLOCK (pad);
1460 GST_OBJECT_UNLOCK (pad);
1461 g_warning ("%s: pad `%p' has no probe with id `%lu'", G_STRLOC, pad, id);
1467 * gst_pad_is_blocked:
1468 * @pad: the #GstPad to query
1470 * Checks if the pad is blocked or not. This function returns the
1471 * last requested state of the pad. It is not certain that the pad
1472 * is actually blocking at this point (see gst_pad_is_blocking()).
1474 * Returns: %TRUE if the pad is blocked.
1479 gst_pad_is_blocked (GstPad * pad)
1481 gboolean result = FALSE;
1483 g_return_val_if_fail (GST_IS_PAD (pad), result);
1485 GST_OBJECT_LOCK (pad);
1486 result = GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_BLOCKED);
1487 GST_OBJECT_UNLOCK (pad);
1493 * gst_pad_is_blocking:
1494 * @pad: the #GstPad to query
1496 * Checks if the pad is blocking or not. This is a guaranteed state
1497 * of whether the pad is actually blocking on a #GstBuffer or a #GstEvent.
1499 * Returns: %TRUE if the pad is blocking.
1504 gst_pad_is_blocking (GstPad * pad)
1506 gboolean result = FALSE;
1508 g_return_val_if_fail (GST_IS_PAD (pad), result);
1510 GST_OBJECT_LOCK (pad);
1511 /* the blocking flag is only valid if the pad is not flushing */
1512 result = GST_PAD_IS_BLOCKING (pad) && !GST_PAD_IS_FLUSHING (pad);
1513 GST_OBJECT_UNLOCK (pad);
1519 * gst_pad_needs_reconfigure:
1520 * @pad: the #GstPad to check
1522 * Check the #GST_PAD_FLAG_NEED_RECONFIGURE flag on @pad and return %TRUE
1523 * if the flag was set.
1525 * Returns: %TRUE is the GST_PAD_FLAG_NEED_RECONFIGURE flag is set on @pad.
1528 gst_pad_needs_reconfigure (GstPad * pad)
1530 gboolean reconfigure;
1532 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1534 GST_OBJECT_LOCK (pad);
1535 reconfigure = GST_PAD_NEEDS_RECONFIGURE (pad);
1536 GST_DEBUG_OBJECT (pad, "peeking RECONFIGURE flag %d", reconfigure);
1537 GST_OBJECT_UNLOCK (pad);
1543 * gst_pad_check_reconfigure:
1544 * @pad: the #GstPad to check
1546 * Check and clear the #GST_PAD_FLAG_NEED_RECONFIGURE flag on @pad and return %TRUE
1547 * if the flag was set.
1549 * Returns: %TRUE is the GST_PAD_FLAG_NEED_RECONFIGURE flag was set on @pad.
1552 gst_pad_check_reconfigure (GstPad * pad)
1554 gboolean reconfigure;
1556 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1558 GST_OBJECT_LOCK (pad);
1559 reconfigure = GST_PAD_NEEDS_RECONFIGURE (pad);
1561 GST_DEBUG_OBJECT (pad, "remove RECONFIGURE flag");
1562 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
1564 GST_OBJECT_UNLOCK (pad);
1570 * gst_pad_mark_reconfigure:
1571 * @pad: the #GstPad to mark
1573 * Mark a pad for needing reconfiguration. The next call to
1574 * gst_pad_check_reconfigure() will return %TRUE after this call.
1577 gst_pad_mark_reconfigure (GstPad * pad)
1579 g_return_if_fail (GST_IS_PAD (pad));
1581 GST_OBJECT_LOCK (pad);
1582 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
1583 GST_OBJECT_UNLOCK (pad);
1587 * gst_pad_set_activate_function:
1589 * @f: the #GstPadActivateFunction to set.
1591 * Calls gst_pad_set_activate_function_full() with %NULL for the user_data and
1595 * gst_pad_set_activate_function_full:
1597 * @activate: the #GstPadActivateFunction to set.
1598 * @user_data: user_data passed to @notify
1599 * @notify: notify called when @activate will not be used anymore.
1601 * Sets the given activate function for @pad. The activate function will
1602 * dispatch to gst_pad_activate_mode() to perform the actual activation.
1603 * Only makes sense to set on sink pads.
1605 * Call this function if your sink pad can start a pull-based task.
1608 gst_pad_set_activate_function_full (GstPad * pad,
1609 GstPadActivateFunction activate, gpointer user_data, GDestroyNotify notify)
1611 g_return_if_fail (GST_IS_PAD (pad));
1613 if (pad->activatenotify)
1614 pad->activatenotify (pad->activatedata);
1615 GST_PAD_ACTIVATEFUNC (pad) = activate;
1616 pad->activatedata = user_data;
1617 pad->activatenotify = notify;
1619 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "activatefunc set to %s",
1620 GST_DEBUG_FUNCPTR_NAME (activate));
1624 * gst_pad_set_activatemode_function:
1626 * @f: the #GstPadActivateModeFunction to set.
1628 * Calls gst_pad_set_activatemode_function_full() with %NULL for the user_data and
1632 * gst_pad_set_activatemode_function_full:
1634 * @activatemode: the #GstPadActivateModeFunction to set.
1635 * @user_data: user_data passed to @notify
1636 * @notify: notify called when @activatemode will not be used anymore.
1638 * Sets the given activate_mode function for the pad. An activate_mode function
1639 * prepares the element for data passing.
1642 gst_pad_set_activatemode_function_full (GstPad * pad,
1643 GstPadActivateModeFunction activatemode, gpointer user_data,
1644 GDestroyNotify notify)
1646 g_return_if_fail (GST_IS_PAD (pad));
1648 if (pad->activatemodenotify)
1649 pad->activatemodenotify (pad->activatemodedata);
1650 GST_PAD_ACTIVATEMODEFUNC (pad) = activatemode;
1651 pad->activatemodedata = user_data;
1652 pad->activatemodenotify = notify;
1654 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "activatemodefunc set to %s",
1655 GST_DEBUG_FUNCPTR_NAME (activatemode));
1659 * gst_pad_set_chain_function:
1660 * @p: a sink #GstPad.
1661 * @f: the #GstPadChainFunction to set.
1663 * Calls gst_pad_set_chain_function_full() with %NULL for the user_data and
1667 * gst_pad_set_chain_function_full:
1668 * @pad: a sink #GstPad.
1669 * @chain: the #GstPadChainFunction to set.
1670 * @user_data: user_data passed to @notify
1671 * @notify: notify called when @chain will not be used anymore.
1673 * Sets the given chain function for the pad. The chain function is called to
1674 * process a #GstBuffer input buffer. see #GstPadChainFunction for more details.
1677 gst_pad_set_chain_function_full (GstPad * pad, GstPadChainFunction chain,
1678 gpointer user_data, GDestroyNotify notify)
1680 g_return_if_fail (GST_IS_PAD (pad));
1681 g_return_if_fail (GST_PAD_IS_SINK (pad));
1683 if (pad->chainnotify)
1684 pad->chainnotify (pad->chaindata);
1685 GST_PAD_CHAINFUNC (pad) = chain;
1686 pad->chaindata = user_data;
1687 pad->chainnotify = notify;
1689 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "chainfunc set to %s",
1690 GST_DEBUG_FUNCPTR_NAME (chain));
1694 * gst_pad_set_chain_list_function:
1695 * @p: a sink #GstPad.
1696 * @f: the #GstPadChainListFunction to set.
1698 * Calls gst_pad_set_chain_list_function_full() with %NULL for the user_data and
1702 * gst_pad_set_chain_list_function_full:
1703 * @pad: a sink #GstPad.
1704 * @chainlist: the #GstPadChainListFunction to set.
1705 * @user_data: user_data passed to @notify
1706 * @notify: notify called when @chainlist will not be used anymore.
1708 * Sets the given chain list function for the pad. The chainlist function is
1709 * called to process a #GstBufferList input buffer list. See
1710 * #GstPadChainListFunction for more details.
1713 gst_pad_set_chain_list_function_full (GstPad * pad,
1714 GstPadChainListFunction chainlist, gpointer user_data,
1715 GDestroyNotify notify)
1717 g_return_if_fail (GST_IS_PAD (pad));
1718 g_return_if_fail (GST_PAD_IS_SINK (pad));
1720 if (pad->chainlistnotify)
1721 pad->chainlistnotify (pad->chainlistdata);
1722 GST_PAD_CHAINLISTFUNC (pad) = chainlist;
1723 pad->chainlistdata = user_data;
1724 pad->chainlistnotify = notify;
1726 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "chainlistfunc set to %s",
1727 GST_DEBUG_FUNCPTR_NAME (chainlist));
1731 * gst_pad_set_getrange_function:
1732 * @p: a source #GstPad.
1733 * @f: the #GstPadGetRangeFunction to set.
1735 * Calls gst_pad_set_getrange_function_full() with %NULL for the user_data and
1739 * gst_pad_set_getrange_function_full:
1740 * @pad: a source #GstPad.
1741 * @get: the #GstPadGetRangeFunction to set.
1742 * @user_data: user_data passed to @notify
1743 * @notify: notify called when @get will not be used anymore.
1745 * Sets the given getrange function for the pad. The getrange function is
1746 * called to produce a new #GstBuffer to start the processing pipeline. see
1747 * #GstPadGetRangeFunction for a description of the getrange function.
1750 gst_pad_set_getrange_function_full (GstPad * pad, GstPadGetRangeFunction get,
1751 gpointer user_data, GDestroyNotify notify)
1753 g_return_if_fail (GST_IS_PAD (pad));
1754 g_return_if_fail (GST_PAD_IS_SRC (pad));
1756 if (pad->getrangenotify)
1757 pad->getrangenotify (pad->getrangedata);
1758 GST_PAD_GETRANGEFUNC (pad) = get;
1759 pad->getrangedata = user_data;
1760 pad->getrangenotify = notify;
1762 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "getrangefunc set to %s",
1763 GST_DEBUG_FUNCPTR_NAME (get));
1767 * gst_pad_set_event_function:
1768 * @p: a #GstPad of either direction.
1769 * @f: the #GstPadEventFunction to set.
1771 * Calls gst_pad_set_event_function_full() with %NULL for the user_data and
1775 * gst_pad_set_event_function_full:
1776 * @pad: a #GstPad of either direction.
1777 * @event: the #GstPadEventFunction to set.
1778 * @user_data: user_data passed to @notify
1779 * @notify: notify called when @event will not be used anymore.
1781 * Sets the given event handler for the pad.
1784 gst_pad_set_event_function_full (GstPad * pad, GstPadEventFunction event,
1785 gpointer user_data, GDestroyNotify notify)
1787 g_return_if_fail (GST_IS_PAD (pad));
1789 if (pad->eventnotify)
1790 pad->eventnotify (pad->eventdata);
1791 GST_PAD_EVENTFUNC (pad) = event;
1792 pad->eventdata = user_data;
1793 pad->eventnotify = notify;
1795 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "eventfunc for set to %s",
1796 GST_DEBUG_FUNCPTR_NAME (event));
1800 * gst_pad_set_query_function:
1801 * @p: a #GstPad of either direction.
1802 * @f: the #GstPadQueryFunction to set.
1804 * Calls gst_pad_set_query_function_full() with %NULL for the user_data and
1808 * gst_pad_set_query_function_full:
1809 * @pad: a #GstPad of either direction.
1810 * @query: the #GstPadQueryFunction to set.
1811 * @user_data: user_data passed to @notify
1812 * @notify: notify called when @query will not be used anymore.
1814 * Set the given query function for the pad.
1817 gst_pad_set_query_function_full (GstPad * pad, GstPadQueryFunction query,
1818 gpointer user_data, GDestroyNotify notify)
1820 g_return_if_fail (GST_IS_PAD (pad));
1822 if (pad->querynotify)
1823 pad->querynotify (pad->querydata);
1824 GST_PAD_QUERYFUNC (pad) = query;
1825 pad->querydata = user_data;
1826 pad->querynotify = notify;
1828 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "queryfunc set to %s",
1829 GST_DEBUG_FUNCPTR_NAME (query));
1833 * gst_pad_set_iterate_internal_links_function:
1834 * @p: a #GstPad of either direction.
1835 * @f: the #GstPadIterIntLinkFunction to set.
1837 * Calls gst_pad_set_iterate_internal_links_function_full() with %NULL
1838 * for the user_data and notify.
1841 * gst_pad_set_iterate_internal_links_function_full:
1842 * @pad: a #GstPad of either direction.
1843 * @iterintlink: the #GstPadIterIntLinkFunction to set.
1844 * @user_data: user_data passed to @notify
1845 * @notify: notify called when @iterintlink will not be used anymore.
1847 * Sets the given internal link iterator function for the pad.
1850 gst_pad_set_iterate_internal_links_function_full (GstPad * pad,
1851 GstPadIterIntLinkFunction iterintlink, gpointer user_data,
1852 GDestroyNotify notify)
1854 g_return_if_fail (GST_IS_PAD (pad));
1856 if (pad->iterintlinknotify)
1857 pad->iterintlinknotify (pad->iterintlinkdata);
1858 GST_PAD_ITERINTLINKFUNC (pad) = iterintlink;
1859 pad->iterintlinkdata = user_data;
1860 pad->iterintlinknotify = notify;
1862 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "internal link iterator set to %s",
1863 GST_DEBUG_FUNCPTR_NAME (iterintlink));
1867 * gst_pad_set_link_function:
1869 * @f: the #GstPadLinkFunction to set.
1871 * Calls gst_pad_set_link_function_full() with %NULL
1872 * for the user_data and notify.
1875 * gst_pad_set_link_function_full:
1877 * @link: the #GstPadLinkFunction to set.
1878 * @user_data: user_data passed to @notify
1879 * @notify: notify called when @link will not be used anymore.
1881 * Sets the given link function for the pad. It will be called when
1882 * the pad is linked with another pad.
1884 * The return value #GST_PAD_LINK_OK should be used when the connection can be
1887 * The return value #GST_PAD_LINK_REFUSED should be used when the connection
1888 * cannot be made for some reason.
1890 * If @link is installed on a source pad, it should call the #GstPadLinkFunction
1891 * of the peer sink pad, if present.
1894 gst_pad_set_link_function_full (GstPad * pad, GstPadLinkFunction link,
1895 gpointer user_data, GDestroyNotify notify)
1897 g_return_if_fail (GST_IS_PAD (pad));
1899 if (pad->linknotify)
1900 pad->linknotify (pad->linkdata);
1901 GST_PAD_LINKFUNC (pad) = link;
1902 pad->linkdata = user_data;
1903 pad->linknotify = notify;
1905 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "linkfunc set to %s",
1906 GST_DEBUG_FUNCPTR_NAME (link));
1910 * gst_pad_set_unlink_function:
1912 * @f: the #GstPadUnlinkFunction to set.
1914 * Calls gst_pad_set_unlink_function_full() with %NULL
1915 * for the user_data and notify.
1918 * gst_pad_set_unlink_function_full:
1920 * @unlink: the #GstPadUnlinkFunction to set.
1921 * @user_data: user_data passed to @notify
1922 * @notify: notify called when @unlink will not be used anymore.
1924 * Sets the given unlink function for the pad. It will be called
1925 * when the pad is unlinked.
1928 gst_pad_set_unlink_function_full (GstPad * pad, GstPadUnlinkFunction unlink,
1929 gpointer user_data, GDestroyNotify notify)
1931 g_return_if_fail (GST_IS_PAD (pad));
1933 if (pad->unlinknotify)
1934 pad->unlinknotify (pad->unlinkdata);
1935 GST_PAD_UNLINKFUNC (pad) = unlink;
1936 pad->unlinkdata = user_data;
1937 pad->unlinknotify = notify;
1939 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "unlinkfunc set to %s",
1940 GST_DEBUG_FUNCPTR_NAME (unlink));
1945 * @srcpad: the source #GstPad to unlink.
1946 * @sinkpad: the sink #GstPad to unlink.
1948 * Unlinks the source pad from the sink pad. Will emit the #GstPad::unlinked
1949 * signal on both pads.
1951 * Returns: %TRUE if the pads were unlinked. This function returns %FALSE if
1952 * the pads were not linked together.
1957 gst_pad_unlink (GstPad * srcpad, GstPad * sinkpad)
1959 gboolean result = FALSE;
1960 GstElement *parent = NULL;
1962 g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
1963 g_return_val_if_fail (GST_PAD_IS_SRC (srcpad), FALSE);
1964 g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
1965 g_return_val_if_fail (GST_PAD_IS_SINK (sinkpad), FALSE);
1967 GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinking %s:%s(%p) and %s:%s(%p)",
1968 GST_DEBUG_PAD_NAME (srcpad), srcpad,
1969 GST_DEBUG_PAD_NAME (sinkpad), sinkpad);
1971 /* We need to notify the parent before taking any pad locks as the bin in
1972 * question might be waiting for a lock on the pad while holding its lock
1973 * that our message will try to take. */
1974 if ((parent = GST_ELEMENT_CAST (gst_pad_get_parent (srcpad)))) {
1975 if (GST_IS_ELEMENT (parent)) {
1976 gst_element_post_message (parent,
1977 gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
1978 GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK, parent, TRUE));
1980 gst_object_unref (parent);
1985 GST_OBJECT_LOCK (srcpad);
1986 GST_OBJECT_LOCK (sinkpad);
1988 if (G_UNLIKELY (GST_PAD_PEER (srcpad) != sinkpad))
1989 goto not_linked_together;
1991 if (GST_PAD_UNLINKFUNC (srcpad)) {
1992 GstObject *tmpparent;
1994 ACQUIRE_PARENT (srcpad, tmpparent, no_src_parent);
1996 GST_PAD_UNLINKFUNC (srcpad) (srcpad, tmpparent);
1997 RELEASE_PARENT (tmpparent);
2000 if (GST_PAD_UNLINKFUNC (sinkpad)) {
2001 GstObject *tmpparent;
2003 ACQUIRE_PARENT (sinkpad, tmpparent, no_sink_parent);
2005 GST_PAD_UNLINKFUNC (sinkpad) (sinkpad, tmpparent);
2006 RELEASE_PARENT (tmpparent);
2010 /* first clear peers */
2011 GST_PAD_PEER (srcpad) = NULL;
2012 GST_PAD_PEER (sinkpad) = NULL;
2014 GST_OBJECT_UNLOCK (sinkpad);
2015 GST_OBJECT_UNLOCK (srcpad);
2017 /* fire off a signal to each of the pads telling them
2018 * that they've been unlinked */
2019 g_signal_emit (srcpad, gst_pad_signals[PAD_UNLINKED], 0, sinkpad);
2020 g_signal_emit (sinkpad, gst_pad_signals[PAD_UNLINKED], 0, srcpad);
2022 GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinked %s:%s and %s:%s",
2023 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
2028 if (parent != NULL) {
2029 gst_element_post_message (parent,
2030 gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
2031 GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK, parent, FALSE));
2032 gst_object_unref (parent);
2037 not_linked_together:
2039 /* we do not emit a warning in this case because unlinking cannot
2040 * be made MT safe.*/
2041 GST_OBJECT_UNLOCK (sinkpad);
2042 GST_OBJECT_UNLOCK (srcpad);
2048 * gst_pad_is_linked:
2049 * @pad: pad to check
2051 * Checks if a @pad is linked to another pad or not.
2053 * Returns: %TRUE if the pad is linked, %FALSE otherwise.
2058 gst_pad_is_linked (GstPad * pad)
2062 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2064 GST_OBJECT_LOCK (pad);
2065 result = (GST_PAD_PEER (pad) != NULL);
2066 GST_OBJECT_UNLOCK (pad);
2071 /* get the caps from both pads and see if the intersection
2074 * This function should be called with the pad LOCK on both
2078 gst_pad_link_check_compatible_unlocked (GstPad * src, GstPad * sink,
2079 GstPadLinkCheck flags)
2081 GstCaps *srccaps = NULL;
2082 GstCaps *sinkcaps = NULL;
2083 gboolean compatible = FALSE;
2085 if (!(flags & (GST_PAD_LINK_CHECK_CAPS | GST_PAD_LINK_CHECK_TEMPLATE_CAPS)))
2088 /* Doing the expensive caps checking takes priority over only checking the template caps */
2089 if (flags & GST_PAD_LINK_CHECK_CAPS) {
2090 GST_OBJECT_UNLOCK (sink);
2091 GST_OBJECT_UNLOCK (src);
2093 srccaps = gst_pad_query_caps (src, NULL);
2094 sinkcaps = gst_pad_query_caps (sink, NULL);
2096 GST_OBJECT_LOCK (src);
2097 GST_OBJECT_LOCK (sink);
2099 /* If one of the two pads doesn't have a template, consider the intersection
2101 if (G_UNLIKELY ((GST_PAD_PAD_TEMPLATE (src) == NULL)
2102 || (GST_PAD_PAD_TEMPLATE (sink) == NULL))) {
2106 srccaps = gst_caps_ref (GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (src)));
2108 gst_caps_ref (GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (sink)));
2111 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, src, "src caps %" GST_PTR_FORMAT,
2113 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, sink, "sink caps %" GST_PTR_FORMAT,
2116 /* if we have caps on both pads we can check the intersection. If one
2117 * of the caps is %NULL, we return %TRUE. */
2118 if (G_UNLIKELY (srccaps == NULL || sinkcaps == NULL)) {
2120 gst_caps_unref (srccaps);
2122 gst_caps_unref (sinkcaps);
2126 compatible = gst_caps_can_intersect (srccaps, sinkcaps);
2127 gst_caps_unref (srccaps);
2128 gst_caps_unref (sinkcaps);
2131 GST_CAT_DEBUG (GST_CAT_CAPS, "caps are %scompatible",
2132 (compatible ? "" : "not "));
2137 /* check if the grandparents of both pads are the same.
2138 * This check is required so that we don't try to link
2139 * pads from elements in different bins without ghostpads.
2141 * The LOCK should be held on both pads
2144 gst_pad_link_check_hierarchy (GstPad * src, GstPad * sink)
2146 GstObject *psrc, *psink;
2148 psrc = GST_OBJECT_PARENT (src);
2149 psink = GST_OBJECT_PARENT (sink);
2151 /* if one of the pads has no parent, we allow the link */
2152 if (G_UNLIKELY (psrc == NULL || psink == NULL))
2155 /* only care about parents that are elements */
2156 if (G_UNLIKELY (!GST_IS_ELEMENT (psrc) || !GST_IS_ELEMENT (psink)))
2157 goto no_element_parent;
2159 /* if the parents are the same, we have a loop */
2160 if (G_UNLIKELY (psrc == psink))
2163 /* if they both have a parent, we check the grandparents. We can not lock
2164 * the parent because we hold on the child (pad) and the locking order is
2165 * parent >> child. */
2166 psrc = GST_OBJECT_PARENT (psrc);
2167 psink = GST_OBJECT_PARENT (psink);
2169 /* if they have grandparents but they are not the same */
2170 if (G_UNLIKELY (psrc != psink))
2171 goto wrong_grandparents;
2178 GST_CAT_DEBUG (GST_CAT_CAPS,
2179 "one of the pads has no parent %" GST_PTR_FORMAT " and %"
2180 GST_PTR_FORMAT, psrc, psink);
2185 GST_CAT_DEBUG (GST_CAT_CAPS,
2186 "one of the pads has no element parent %" GST_PTR_FORMAT " and %"
2187 GST_PTR_FORMAT, psrc, psink);
2192 GST_CAT_DEBUG (GST_CAT_CAPS, "pads have same parent %" GST_PTR_FORMAT,
2198 GST_CAT_DEBUG (GST_CAT_CAPS,
2199 "pads have different grandparents %" GST_PTR_FORMAT " and %"
2200 GST_PTR_FORMAT, psrc, psink);
2205 /* FIXME leftover from an attempt at refactoring... */
2206 /* call with the two pads unlocked, when this function returns GST_PAD_LINK_OK,
2207 * the two pads will be locked in the srcpad, sinkpad order. */
2208 static GstPadLinkReturn
2209 gst_pad_link_prepare (GstPad * srcpad, GstPad * sinkpad, GstPadLinkCheck flags)
2211 GST_CAT_INFO (GST_CAT_PADS, "trying to link %s:%s and %s:%s",
2212 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
2214 GST_OBJECT_LOCK (srcpad);
2216 if (G_UNLIKELY (GST_PAD_PEER (srcpad) != NULL))
2217 goto src_was_linked;
2219 GST_OBJECT_LOCK (sinkpad);
2221 if (G_UNLIKELY (GST_PAD_PEER (sinkpad) != NULL))
2222 goto sink_was_linked;
2224 /* check hierarchy, pads can only be linked if the grandparents
2226 if ((flags & GST_PAD_LINK_CHECK_HIERARCHY)
2227 && !gst_pad_link_check_hierarchy (srcpad, sinkpad))
2228 goto wrong_hierarchy;
2230 /* check pad caps for non-empty intersection */
2231 if (!gst_pad_link_check_compatible_unlocked (srcpad, sinkpad, flags))
2234 /* FIXME check pad scheduling for non-empty intersection */
2236 return GST_PAD_LINK_OK;
2240 GST_CAT_INFO (GST_CAT_PADS, "src %s:%s was already linked to %s:%s",
2241 GST_DEBUG_PAD_NAME (srcpad),
2242 GST_DEBUG_PAD_NAME (GST_PAD_PEER (srcpad)));
2243 /* we do not emit a warning in this case because unlinking cannot
2244 * be made MT safe.*/
2245 GST_OBJECT_UNLOCK (srcpad);
2246 return GST_PAD_LINK_WAS_LINKED;
2250 GST_CAT_INFO (GST_CAT_PADS, "sink %s:%s was already linked to %s:%s",
2251 GST_DEBUG_PAD_NAME (sinkpad),
2252 GST_DEBUG_PAD_NAME (GST_PAD_PEER (sinkpad)));
2253 /* we do not emit a warning in this case because unlinking cannot
2254 * be made MT safe.*/
2255 GST_OBJECT_UNLOCK (sinkpad);
2256 GST_OBJECT_UNLOCK (srcpad);
2257 return GST_PAD_LINK_WAS_LINKED;
2261 GST_CAT_INFO (GST_CAT_PADS, "pads have wrong hierarchy");
2262 GST_OBJECT_UNLOCK (sinkpad);
2263 GST_OBJECT_UNLOCK (srcpad);
2264 return GST_PAD_LINK_WRONG_HIERARCHY;
2268 GST_CAT_INFO (GST_CAT_PADS, "caps are incompatible");
2269 GST_OBJECT_UNLOCK (sinkpad);
2270 GST_OBJECT_UNLOCK (srcpad);
2271 return GST_PAD_LINK_NOFORMAT;
2277 * @srcpad: the source #GstPad.
2278 * @sinkpad: the sink #GstPad.
2280 * Checks if the source pad and the sink pad are compatible so they can be
2283 * Returns: %TRUE if the pads can be linked.
2286 gst_pad_can_link (GstPad * srcpad, GstPad * sinkpad)
2288 GstPadLinkReturn result;
2290 /* generic checks */
2291 g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
2292 g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
2294 GST_CAT_INFO (GST_CAT_PADS, "check if %s:%s can link with %s:%s",
2295 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
2297 /* gst_pad_link_prepare does everything for us, we only release the locks
2298 * on the pads that it gets us. If this function returns !OK the locks are not
2300 result = gst_pad_link_prepare (srcpad, sinkpad, GST_PAD_LINK_CHECK_DEFAULT);
2301 if (result != GST_PAD_LINK_OK)
2304 GST_OBJECT_UNLOCK (srcpad);
2305 GST_OBJECT_UNLOCK (sinkpad);
2308 return result == GST_PAD_LINK_OK;
2312 * gst_pad_link_full:
2313 * @srcpad: the source #GstPad to link.
2314 * @sinkpad: the sink #GstPad to link.
2315 * @flags: the checks to validate when linking
2317 * Links the source pad and the sink pad.
2319 * This variant of #gst_pad_link provides a more granular control on the
2320 * checks being done when linking. While providing some considerable speedups
2321 * the caller of this method must be aware that wrong usage of those flags
2322 * can cause severe issues. Refer to the documentation of #GstPadLinkCheck
2323 * for more information.
2327 * Returns: A result code indicating if the connection worked or
2331 gst_pad_link_full (GstPad * srcpad, GstPad * sinkpad, GstPadLinkCheck flags)
2333 GstPadLinkReturn result;
2335 GstPadLinkFunction srcfunc, sinkfunc;
2337 g_return_val_if_fail (GST_IS_PAD (srcpad), GST_PAD_LINK_REFUSED);
2338 g_return_val_if_fail (GST_PAD_IS_SRC (srcpad), GST_PAD_LINK_WRONG_DIRECTION);
2339 g_return_val_if_fail (GST_IS_PAD (sinkpad), GST_PAD_LINK_REFUSED);
2340 g_return_val_if_fail (GST_PAD_IS_SINK (sinkpad),
2341 GST_PAD_LINK_WRONG_DIRECTION);
2343 /* Notify the parent early. See gst_pad_unlink for details. */
2344 if (G_LIKELY ((parent = GST_ELEMENT_CAST (gst_pad_get_parent (srcpad))))) {
2345 if (G_LIKELY (GST_IS_ELEMENT (parent))) {
2346 gst_element_post_message (parent,
2347 gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
2348 GST_STRUCTURE_CHANGE_TYPE_PAD_LINK, parent, TRUE));
2350 gst_object_unref (parent);
2355 /* prepare will also lock the two pads */
2356 result = gst_pad_link_prepare (srcpad, sinkpad, flags);
2358 if (G_UNLIKELY (result != GST_PAD_LINK_OK)) {
2359 GST_CAT_INFO (GST_CAT_PADS, "link between %s:%s and %s:%s failed: %s",
2360 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad),
2361 gst_pad_link_get_name (result));
2365 /* must set peers before calling the link function */
2366 GST_PAD_PEER (srcpad) = sinkpad;
2367 GST_PAD_PEER (sinkpad) = srcpad;
2369 /* check events, when something is different, mark pending */
2370 schedule_events (srcpad, sinkpad);
2372 /* get the link functions */
2373 srcfunc = GST_PAD_LINKFUNC (srcpad);
2374 sinkfunc = GST_PAD_LINKFUNC (sinkpad);
2376 if (G_UNLIKELY (srcfunc || sinkfunc)) {
2377 /* custom link functions, execute them */
2378 GST_OBJECT_UNLOCK (sinkpad);
2379 GST_OBJECT_UNLOCK (srcpad);
2382 GstObject *tmpparent;
2384 ACQUIRE_PARENT (srcpad, tmpparent, no_parent);
2385 /* this one will call the peer link function */
2386 result = srcfunc (srcpad, tmpparent, sinkpad);
2387 RELEASE_PARENT (tmpparent);
2388 } else if (sinkfunc) {
2389 GstObject *tmpparent;
2391 ACQUIRE_PARENT (sinkpad, tmpparent, no_parent);
2392 /* if no source link function, we need to call the sink link
2393 * function ourselves. */
2394 result = sinkfunc (sinkpad, tmpparent, srcpad);
2395 RELEASE_PARENT (tmpparent);
2399 GST_OBJECT_LOCK (srcpad);
2400 GST_OBJECT_LOCK (sinkpad);
2402 /* we released the lock, check if the same pads are linked still */
2403 if (GST_PAD_PEER (srcpad) != sinkpad || GST_PAD_PEER (sinkpad) != srcpad)
2404 goto concurrent_link;
2406 if (G_UNLIKELY (result != GST_PAD_LINK_OK))
2409 GST_OBJECT_UNLOCK (sinkpad);
2410 GST_OBJECT_UNLOCK (srcpad);
2412 /* fire off a signal to each of the pads telling them
2413 * that they've been linked */
2414 g_signal_emit (srcpad, gst_pad_signals[PAD_LINKED], 0, sinkpad);
2415 g_signal_emit (sinkpad, gst_pad_signals[PAD_LINKED], 0, srcpad);
2417 GST_CAT_INFO (GST_CAT_PADS, "linked %s:%s and %s:%s, successful",
2418 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
2420 gst_pad_send_event (srcpad, gst_event_new_reconfigure ());
2423 if (G_LIKELY (parent)) {
2424 gst_element_post_message (parent,
2425 gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
2426 GST_STRUCTURE_CHANGE_TYPE_PAD_LINK, parent, FALSE));
2427 gst_object_unref (parent);
2435 GST_CAT_INFO (GST_CAT_PADS, "concurrent link between %s:%s and %s:%s",
2436 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
2437 GST_OBJECT_UNLOCK (sinkpad);
2438 GST_OBJECT_UNLOCK (srcpad);
2440 /* The other link operation succeeded first */
2441 result = GST_PAD_LINK_WAS_LINKED;
2446 GST_CAT_INFO (GST_CAT_PADS, "link between %s:%s and %s:%s failed: %s",
2447 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad),
2448 gst_pad_link_get_name (result));
2450 GST_PAD_PEER (srcpad) = NULL;
2451 GST_PAD_PEER (sinkpad) = NULL;
2453 GST_OBJECT_UNLOCK (sinkpad);
2454 GST_OBJECT_UNLOCK (srcpad);
2462 * @srcpad: the source #GstPad to link.
2463 * @sinkpad: the sink #GstPad to link.
2465 * Links the source pad and the sink pad.
2467 * Returns: A result code indicating if the connection worked or
2473 gst_pad_link (GstPad * srcpad, GstPad * sinkpad)
2475 return gst_pad_link_full (srcpad, sinkpad, GST_PAD_LINK_CHECK_DEFAULT);
2479 gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ)
2481 GstPadTemplate **template_p;
2483 /* this function would need checks if it weren't static */
2485 GST_OBJECT_LOCK (pad);
2486 template_p = &pad->padtemplate;
2487 gst_object_replace ((GstObject **) template_p, (GstObject *) templ);
2488 GST_OBJECT_UNLOCK (pad);
2491 gst_pad_template_pad_created (templ, pad);
2495 * gst_pad_get_pad_template:
2498 * Gets the template for @pad.
2500 * Returns: (transfer full) (nullable): the #GstPadTemplate from which
2501 * this pad was instantiated, or %NULL if this pad has no
2502 * template. Unref after usage.
2505 gst_pad_get_pad_template (GstPad * pad)
2507 GstPadTemplate *templ;
2509 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2511 templ = GST_PAD_PAD_TEMPLATE (pad);
2513 return (templ ? gst_object_ref (templ) : NULL);
2517 * gst_pad_has_current_caps:
2518 * @pad: a #GstPad to check
2520 * Check if @pad has caps set on it with a #GST_EVENT_CAPS event.
2522 * Returns: %TRUE when @pad has caps associated with it.
2525 gst_pad_has_current_caps (GstPad * pad)
2530 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2532 GST_OBJECT_LOCK (pad);
2533 caps = get_pad_caps (pad);
2534 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
2535 "check current pad caps %" GST_PTR_FORMAT, caps);
2536 result = (caps != NULL);
2537 GST_OBJECT_UNLOCK (pad);
2543 * gst_pad_get_current_caps:
2544 * @pad: a #GstPad to get the current capabilities of.
2546 * Gets the capabilities currently configured on @pad with the last
2547 * #GST_EVENT_CAPS event.
2549 * Returns: the current caps of the pad with incremented ref-count.
2552 gst_pad_get_current_caps (GstPad * pad)
2556 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2558 GST_OBJECT_LOCK (pad);
2559 if ((result = get_pad_caps (pad)))
2560 gst_caps_ref (result);
2561 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
2562 "get current pad caps %" GST_PTR_FORMAT, result);
2563 GST_OBJECT_UNLOCK (pad);
2569 * gst_pad_get_pad_template_caps:
2570 * @pad: a #GstPad to get the template capabilities from.
2572 * Gets the capabilities for @pad's template.
2574 * Returns: (transfer full): the #GstCaps of this pad template.
2575 * Unref after usage.
2578 gst_pad_get_pad_template_caps (GstPad * pad)
2580 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2582 if (GST_PAD_PAD_TEMPLATE (pad))
2583 return gst_pad_template_get_caps (GST_PAD_PAD_TEMPLATE (pad));
2585 return gst_caps_ref (GST_CAPS_ANY);
2590 * @pad: a #GstPad to get the peer of.
2592 * Gets the peer of @pad. This function refs the peer pad so
2593 * you need to unref it after use.
2595 * Returns: (transfer full): the peer #GstPad. Unref after usage.
2600 gst_pad_get_peer (GstPad * pad)
2604 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2606 GST_OBJECT_LOCK (pad);
2607 result = GST_PAD_PEER (pad);
2609 gst_object_ref (result);
2610 GST_OBJECT_UNLOCK (pad);
2616 * gst_pad_get_allowed_caps:
2619 * Gets the capabilities of the allowed media types that can flow through
2620 * @pad and its peer.
2622 * The allowed capabilities is calculated as the intersection of the results of
2623 * calling gst_pad_query_caps() on @pad and its peer. The caller owns a reference
2624 * on the resulting caps.
2626 * Returns: (transfer full) (nullable): the allowed #GstCaps of the
2627 * pad link. Unref the caps when you no longer need it. This
2628 * function returns %NULL when @pad has no peer.
2633 gst_pad_get_allowed_caps (GstPad * pad)
2639 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2641 GST_OBJECT_LOCK (pad);
2642 peer = GST_PAD_PEER (pad);
2643 if (G_UNLIKELY (peer == NULL))
2646 GST_CAT_DEBUG_OBJECT (GST_CAT_PROPERTIES, pad, "getting allowed caps");
2648 gst_object_ref (peer);
2649 GST_OBJECT_UNLOCK (pad);
2650 mycaps = gst_pad_query_caps (pad, NULL);
2652 caps = gst_pad_query_caps (peer, mycaps);
2653 gst_object_unref (peer);
2655 gst_caps_unref (mycaps);
2657 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "allowed caps %" GST_PTR_FORMAT,
2664 GST_CAT_DEBUG_OBJECT (GST_CAT_PROPERTIES, pad, "no peer");
2665 GST_OBJECT_UNLOCK (pad);
2672 * gst_pad_iterate_internal_links_default:
2673 * @pad: the #GstPad to get the internal links of.
2674 * @parent: (allow-none): the parent of @pad or %NULL
2676 * Iterate the list of pads to which the given pad is linked to inside of
2677 * the parent element.
2678 * This is the default handler, and thus returns an iterator of all of the
2679 * pads inside the parent element with opposite direction.
2681 * The caller must free this iterator after use with gst_iterator_free().
2683 * Returns: (nullable): a #GstIterator of #GstPad, or %NULL if @pad
2684 * has no parent. Unref each returned pad with gst_object_unref().
2687 gst_pad_iterate_internal_links_default (GstPad * pad, GstObject * parent)
2694 GstElement *eparent;
2696 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2698 if (parent != NULL && GST_IS_ELEMENT (parent)) {
2699 eparent = GST_ELEMENT_CAST (gst_object_ref (parent));
2701 GST_OBJECT_LOCK (pad);
2702 eparent = GST_PAD_PARENT (pad);
2703 if (!eparent || !GST_IS_ELEMENT (eparent))
2706 gst_object_ref (eparent);
2707 GST_OBJECT_UNLOCK (pad);
2710 if (pad->direction == GST_PAD_SRC)
2711 padlist = &eparent->sinkpads;
2713 padlist = &eparent->srcpads;
2715 GST_DEBUG_OBJECT (pad, "Making iterator");
2717 cookie = &eparent->pads_cookie;
2719 lock = GST_OBJECT_GET_LOCK (eparent);
2721 res = gst_iterator_new_list (GST_TYPE_PAD,
2722 lock, cookie, padlist, (GObject *) owner, NULL);
2724 gst_object_unref (owner);
2731 GST_OBJECT_UNLOCK (pad);
2732 GST_DEBUG_OBJECT (pad, "no parent element");
2738 * gst_pad_iterate_internal_links:
2739 * @pad: the GstPad to get the internal links of.
2741 * Gets an iterator for the pads to which the given pad is linked to inside
2742 * of the parent element.
2744 * Each #GstPad element yielded by the iterator will have its refcount increased,
2745 * so unref after use.
2747 * Free-function: gst_iterator_free
2749 * Returns: (transfer full) (nullable): a new #GstIterator of #GstPad
2750 * or %NULL when the pad does not have an iterator function
2751 * configured. Use gst_iterator_free() after usage.
2754 gst_pad_iterate_internal_links (GstPad * pad)
2756 GstIterator *res = NULL;
2759 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2761 GST_OBJECT_LOCK (pad);
2762 ACQUIRE_PARENT (pad, parent, no_parent);
2763 GST_OBJECT_UNLOCK (pad);
2765 if (GST_PAD_ITERINTLINKFUNC (pad))
2766 res = GST_PAD_ITERINTLINKFUNC (pad) (pad, parent);
2768 RELEASE_PARENT (parent);
2775 GST_DEBUG_OBJECT (pad, "no parent");
2776 GST_OBJECT_UNLOCK (pad);
2784 * @forward: (scope call): a #GstPadForwardFunction
2785 * @user_data: user data passed to @forward
2787 * Calls @forward for all internally linked pads of @pad. This function deals with
2788 * dynamically changing internal pads and will make sure that the @forward
2789 * function is only called once for each pad.
2791 * When @forward returns %TRUE, no further pads will be processed.
2793 * Returns: %TRUE if one of the dispatcher functions returned %TRUE.
2796 gst_pad_forward (GstPad * pad, GstPadForwardFunction forward,
2799 gboolean result = FALSE;
2801 gboolean done = FALSE;
2802 GValue item = { 0, };
2803 GList *pushed_pads = NULL;
2805 iter = gst_pad_iterate_internal_links (pad);
2811 switch (gst_iterator_next (iter, &item)) {
2812 case GST_ITERATOR_OK:
2816 intpad = g_value_get_object (&item);
2818 /* if already pushed, skip. FIXME, find something faster to tag pads */
2819 if (intpad == NULL || g_list_find (pushed_pads, intpad)) {
2820 g_value_reset (&item);
2824 GST_LOG_OBJECT (pad, "calling forward function on pad %s:%s",
2825 GST_DEBUG_PAD_NAME (intpad));
2826 done = result = forward (intpad, user_data);
2828 pushed_pads = g_list_prepend (pushed_pads, intpad);
2830 g_value_reset (&item);
2833 case GST_ITERATOR_RESYNC:
2834 /* We don't reset the result here because we don't push the event
2835 * again on pads that got the event already and because we need
2836 * to consider the result of the previous pushes */
2837 gst_iterator_resync (iter);
2839 case GST_ITERATOR_ERROR:
2840 GST_ERROR_OBJECT (pad, "Could not iterate over internally linked pads");
2843 case GST_ITERATOR_DONE:
2848 g_value_unset (&item);
2849 gst_iterator_free (iter);
2851 g_list_free (pushed_pads);
2861 gboolean dispatched;
2865 event_forward_func (GstPad * pad, EventData * data)
2867 /* for each pad we send to, we should ref the event; it's up
2868 * to downstream to unref again when handled. */
2869 GST_LOG_OBJECT (pad, "Reffing and pushing event %p (%s) to %s:%s",
2870 data->event, GST_EVENT_TYPE_NAME (data->event), GST_DEBUG_PAD_NAME (pad));
2872 data->result |= gst_pad_push_event (pad, gst_event_ref (data->event));
2874 data->dispatched = TRUE;
2881 * gst_pad_event_default:
2882 * @pad: a #GstPad to call the default event handler on.
2883 * @parent: (allow-none): the parent of @pad or %NULL
2884 * @event: (transfer full): the #GstEvent to handle.
2886 * Invokes the default event handler for the given pad.
2888 * The EOS event will pause the task associated with @pad before it is forwarded
2889 * to all internally linked pads,
2891 * The event is sent to all pads internally linked to @pad. This function
2892 * takes ownership of @event.
2894 * Returns: %TRUE if the event was sent successfully.
2897 gst_pad_event_default (GstPad * pad, GstObject * parent, GstEvent * event)
2899 gboolean result, forward = TRUE;
2901 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2902 g_return_val_if_fail (event != NULL, FALSE);
2904 GST_LOG_OBJECT (pad, "default event handler for event %" GST_PTR_FORMAT,
2907 switch (GST_EVENT_TYPE (event)) {
2908 case GST_EVENT_CAPS:
2909 forward = GST_PAD_IS_PROXY_CAPS (pad);
2920 data.dispatched = FALSE;
2921 data.result = FALSE;
2923 gst_pad_forward (pad, (GstPadForwardFunction) event_forward_func, &data);
2925 /* for sinkpads without a parent element or without internal links, nothing
2926 * will be dispatched but we still want to return TRUE. */
2927 if (data.dispatched)
2928 result = data.result;
2933 gst_event_unref (event);
2938 /* Default accept caps implementation just checks against
2939 * the allowed caps for the pad */
2941 gst_pad_query_accept_caps_default (GstPad * pad, GstQuery * query)
2943 /* get the caps and see if it intersects to something not empty */
2944 GstCaps *caps, *allowed;
2947 GST_DEBUG_OBJECT (pad, "query accept-caps %" GST_PTR_FORMAT, query);
2949 /* first forward the query to internally linked pads when we are dealing with
2951 if (GST_PAD_IS_PROXY_CAPS (pad)) {
2952 if ((result = gst_pad_proxy_query_accept_caps (pad, query))) {
2957 GST_CAT_DEBUG_OBJECT (GST_CAT_PERFORMANCE, pad,
2958 "fallback ACCEPT_CAPS query, consider implementing a specialized version");
2960 gst_query_parse_accept_caps (query, &caps);
2961 allowed = gst_pad_query_caps (pad, caps);
2964 if (GST_PAD_IS_ACCEPT_INTERSECT (pad)) {
2965 GST_DEBUG_OBJECT (pad,
2966 "allowed caps intersect %" GST_PTR_FORMAT ", caps %" GST_PTR_FORMAT,
2968 result = gst_caps_can_intersect (caps, allowed);
2970 GST_DEBUG_OBJECT (pad, "allowed caps subset %" GST_PTR_FORMAT ", caps %"
2971 GST_PTR_FORMAT, allowed, caps);
2972 result = gst_caps_is_subset (caps, allowed);
2974 gst_caps_unref (allowed);
2976 GST_DEBUG_OBJECT (pad, "no compatible caps allowed on the pad");
2979 gst_query_set_accept_caps_result (query, result);
2985 /* Default caps implementation */
2987 gst_pad_query_caps_default (GstPad * pad, GstQuery * query)
2989 GstCaps *result = NULL, *filter;
2990 GstPadTemplate *templ;
2991 gboolean fixed_caps;
2993 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "query caps %" GST_PTR_FORMAT,
2996 /* first try to proxy if we must */
2997 if (GST_PAD_IS_PROXY_CAPS (pad)) {
2998 if ((gst_pad_proxy_query_caps (pad, query))) {
3003 gst_query_parse_caps (query, &filter);
3005 /* no proxy or it failed, do default handling */
3006 fixed_caps = GST_PAD_IS_FIXED_CAPS (pad);
3008 GST_OBJECT_LOCK (pad);
3010 /* fixed caps, try the negotiated caps first */
3011 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "fixed pad caps: trying pad caps");
3012 if ((result = get_pad_caps (pad)))
3013 goto filter_done_unlock;
3016 if ((templ = GST_PAD_PAD_TEMPLATE (pad))) {
3017 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "trying pad template caps");
3018 if ((result = GST_PAD_TEMPLATE_CAPS (templ)))
3019 goto filter_done_unlock;
3023 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
3024 "non-fixed pad caps: trying pad caps");
3025 /* non fixed caps, try the negotiated caps */
3026 if ((result = get_pad_caps (pad)))
3027 goto filter_done_unlock;
3030 /* this almost never happens */
3031 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "pad has no caps");
3032 result = GST_CAPS_ANY;
3035 GST_OBJECT_UNLOCK (pad);
3037 /* run the filter on the result */
3039 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
3040 "using caps %p %" GST_PTR_FORMAT " with filter %p %"
3041 GST_PTR_FORMAT, result, result, filter, filter);
3042 result = gst_caps_intersect_full (filter, result, GST_CAPS_INTERSECT_FIRST);
3043 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "result %p %" GST_PTR_FORMAT,
3046 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
3047 "using caps %p %" GST_PTR_FORMAT, result, result);
3048 result = gst_caps_ref (result);
3050 gst_query_set_caps_result (query, result);
3051 gst_caps_unref (result);
3057 /* Default latency implementation */
3061 GstClockTime min, max;
3065 query_latency_default_fold (const GValue * item, GValue * ret,
3068 GstPad *pad = g_value_get_object (item), *peer;
3069 LatencyFoldData *fold_data = user_data;
3071 gboolean res = FALSE;
3073 query = gst_query_new_latency ();
3075 peer = gst_pad_get_peer (pad);
3077 res = gst_pad_peer_query (pad, query);
3079 GST_LOG_OBJECT (pad, "No peer pad found, ignoring this pad");
3084 GstClockTime min, max;
3086 gst_query_parse_latency (query, &live, &min, &max);
3088 GST_LOG_OBJECT (pad, "got latency live:%s min:%" G_GINT64_FORMAT
3089 " max:%" G_GINT64_FORMAT, live ? "true" : "false", min, max);
3092 if (min > fold_data->min)
3093 fold_data->min = min;
3095 if (fold_data->max == GST_CLOCK_TIME_NONE)
3096 fold_data->max = max;
3097 else if (max < fold_data->max)
3098 fold_data->max = max;
3100 fold_data->live = TRUE;
3103 GST_DEBUG_OBJECT (pad, "latency query failed");
3104 g_value_set_boolean (ret, FALSE);
3107 gst_query_unref (query);
3109 gst_object_unref (peer);
3115 gst_pad_query_latency_default (GstPad * pad, GstQuery * query)
3118 GstIteratorResult res;
3119 GValue ret = G_VALUE_INIT;
3121 LatencyFoldData fold_data;
3123 it = gst_pad_iterate_internal_links (pad);
3125 GST_DEBUG_OBJECT (pad, "Can't iterate internal links");
3129 g_value_init (&ret, G_TYPE_BOOLEAN);
3132 fold_data.live = FALSE;
3134 fold_data.max = GST_CLOCK_TIME_NONE;
3136 g_value_set_boolean (&ret, TRUE);
3137 res = gst_iterator_fold (it, query_latency_default_fold, &ret, &fold_data);
3139 case GST_ITERATOR_OK:
3140 g_assert_not_reached ();
3142 case GST_ITERATOR_DONE:
3144 case GST_ITERATOR_ERROR:
3145 g_value_set_boolean (&ret, FALSE);
3147 case GST_ITERATOR_RESYNC:
3148 gst_iterator_resync (it);
3151 g_assert_not_reached ();
3154 gst_iterator_free (it);
3156 query_ret = g_value_get_boolean (&ret);
3158 GST_LOG_OBJECT (pad, "got latency live:%s min:%" G_GINT64_FORMAT
3159 " max:%" G_GINT64_FORMAT, fold_data.live ? "true" : "false",
3160 fold_data.min, fold_data.max);
3162 if (fold_data.min > fold_data.max) {
3163 GST_ERROR_OBJECT (pad, "minimum latency bigger than maximum latency");
3166 gst_query_set_latency (query, fold_data.live, fold_data.min, fold_data.max);
3168 GST_LOG_OBJECT (pad, "latency query failed");
3178 gboolean dispatched;
3182 query_forward_func (GstPad * pad, QueryData * data)
3184 GST_LOG_OBJECT (pad, "query peer %p (%s) of %s:%s",
3185 data->query, GST_QUERY_TYPE_NAME (data->query), GST_DEBUG_PAD_NAME (pad));
3187 data->result |= gst_pad_peer_query (pad, data->query);
3189 data->dispatched = TRUE;
3191 /* stop on first successful reply */
3192 return data->result;
3196 * gst_pad_query_default:
3197 * @pad: a #GstPad to call the default query handler on.
3198 * @parent: (allow-none): the parent of @pad or %NULL
3199 * @query: (transfer none): the #GstQuery to handle.
3201 * Invokes the default query handler for the given pad.
3202 * The query is sent to all pads internally linked to @pad. Note that
3203 * if there are many possible sink pads that are internally linked to
3204 * @pad, only one will be sent the query.
3205 * Multi-sinkpad elements should implement custom query handlers.
3207 * Returns: %TRUE if the query was performed successfully.
3210 gst_pad_query_default (GstPad * pad, GstObject * parent, GstQuery * query)
3212 gboolean forward, ret = FALSE;
3214 switch (GST_QUERY_TYPE (query)) {
3215 case GST_QUERY_SCHEDULING:
3216 forward = GST_PAD_IS_PROXY_SCHEDULING (pad);
3218 case GST_QUERY_ALLOCATION:
3219 forward = GST_PAD_IS_PROXY_ALLOCATION (pad);
3221 case GST_QUERY_ACCEPT_CAPS:
3222 ret = gst_pad_query_accept_caps_default (pad, query);
3225 case GST_QUERY_CAPS:
3226 ret = gst_pad_query_caps_default (pad, query);
3229 case GST_QUERY_LATENCY:
3230 ret = gst_pad_query_latency_default (pad, query);
3233 case GST_QUERY_POSITION:
3234 case GST_QUERY_SEEKING:
3235 case GST_QUERY_FORMATS:
3236 case GST_QUERY_JITTER:
3237 case GST_QUERY_RATE:
3238 case GST_QUERY_CONVERT:
3244 GST_DEBUG_OBJECT (pad, "%sforwarding %p (%s) query", (forward ? "" : "not "),
3245 query, GST_QUERY_TYPE_NAME (query));
3251 data.dispatched = FALSE;
3252 data.result = FALSE;
3254 gst_pad_forward (pad, (GstPadForwardFunction) query_forward_func, &data);
3256 if (data.dispatched) {
3259 /* nothing dispatched, assume drained */
3260 if (GST_QUERY_TYPE (query) == GST_QUERY_DRAIN)
3270 probe_hook_marshal (GHook * hook, ProbeMarshall * data)
3272 GstPad *pad = data->pad;
3273 GstPadProbeInfo *info = data->info;
3274 GstPadProbeType type, flags;
3275 GstPadProbeCallback callback;
3276 GstPadProbeReturn ret;
3277 gpointer original_data;
3279 /* if we have called this callback, do nothing */
3280 if (PROBE_COOKIE (hook) == data->cookie) {
3281 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3282 "hook %lu, cookie %u already called", hook->hook_id,
3283 PROBE_COOKIE (hook));
3287 PROBE_COOKIE (hook) = data->cookie;
3289 flags = hook->flags >> G_HOOK_FLAG_USER_SHIFT;
3291 original_data = info->data;
3293 /* one of the data types for non-idle probes */
3294 if ((type & GST_PAD_PROBE_TYPE_IDLE) == 0
3295 && (flags & GST_PAD_PROBE_TYPE_ALL_BOTH & type) == 0)
3297 /* one of the scheduling types */
3298 if ((flags & GST_PAD_PROBE_TYPE_SCHEDULING & type) == 0)
3300 /* one of the blocking types must match */
3301 if ((type & GST_PAD_PROBE_TYPE_BLOCKING) &&
3302 (flags & GST_PAD_PROBE_TYPE_BLOCKING & type) == 0)
3304 if ((type & GST_PAD_PROBE_TYPE_BLOCKING) == 0 &&
3305 (flags & GST_PAD_PROBE_TYPE_BLOCKING))
3307 /* only probes that have GST_PAD_PROBE_TYPE_EVENT_FLUSH set */
3308 if ((type & GST_PAD_PROBE_TYPE_EVENT_FLUSH) &&
3309 (flags & GST_PAD_PROBE_TYPE_EVENT_FLUSH & type) == 0)
3312 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3313 "hook %lu, cookie %u with flags 0x%08x matches", hook->hook_id,
3314 PROBE_COOKIE (hook), flags);
3316 data->marshalled = TRUE;
3318 callback = (GstPadProbeCallback) hook->func;
3319 if (callback == NULL)
3322 info->id = hook->hook_id;
3324 GST_OBJECT_UNLOCK (pad);
3326 ret = callback (pad, info, hook->data);
3328 GST_OBJECT_LOCK (pad);
3330 if (original_data != NULL && info->data == NULL) {
3331 GST_DEBUG_OBJECT (pad, "data item in pad probe info was dropped");
3332 info->type = GST_PAD_PROBE_TYPE_INVALID;
3333 data->dropped = TRUE;
3337 case GST_PAD_PROBE_REMOVE:
3338 /* remove the probe */
3339 GST_DEBUG_OBJECT (pad, "asked to remove hook");
3340 cleanup_hook (pad, hook);
3342 case GST_PAD_PROBE_DROP:
3343 /* need to drop the data, make sure other probes don't get called
3345 GST_DEBUG_OBJECT (pad, "asked to drop item");
3346 info->type = GST_PAD_PROBE_TYPE_INVALID;
3347 data->dropped = TRUE;
3349 case GST_PAD_PROBE_PASS:
3350 /* inform the pad block to let things pass */
3351 GST_DEBUG_OBJECT (pad, "asked to pass item");
3354 case GST_PAD_PROBE_OK:
3355 GST_DEBUG_OBJECT (pad, "probe returned OK");
3358 GST_DEBUG_OBJECT (pad, "probe returned %d", ret);
3365 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3366 "hook %lu, cookie %u with flags 0x%08x does not match %08x",
3367 hook->hook_id, PROBE_COOKIE (hook), flags, info->type);
3372 /* a probe that does not take or return any data */
3373 #define PROBE_NO_DATA(pad,mask,label,defaultval) \
3375 if (G_UNLIKELY (pad->num_probes)) { \
3376 GstFlowReturn pval = defaultval; \
3377 /* pass NULL as the data item */ \
3378 GstPadProbeInfo info = { mask, 0, NULL, 0, 0 }; \
3379 ret = do_probe_callbacks (pad, &info, defaultval); \
3380 if (G_UNLIKELY (ret != pval && ret != GST_FLOW_OK)) \
3385 #define PROBE_FULL(pad,mask,data,offs,size,label) \
3387 if (G_UNLIKELY (pad->num_probes)) { \
3388 /* pass the data item */ \
3389 GstPadProbeInfo info = { mask, 0, data, offs, size }; \
3390 ret = do_probe_callbacks (pad, &info, GST_FLOW_OK); \
3391 /* store the possibly updated data item */ \
3392 data = GST_PAD_PROBE_INFO_DATA (&info); \
3393 /* if something went wrong, exit */ \
3394 if (G_UNLIKELY (ret != GST_FLOW_OK)) \
3399 #define PROBE_PUSH(pad,mask,data,label) \
3400 PROBE_FULL(pad, mask, data, -1, -1, label);
3401 #define PROBE_PULL(pad,mask,data,offs,size,label) \
3402 PROBE_FULL(pad, mask, data, offs, size, label);
3404 static GstFlowReturn
3405 do_probe_callbacks (GstPad * pad, GstPadProbeInfo * info,
3406 GstFlowReturn defaultval)
3415 data.marshalled = FALSE;
3416 data.dropped = FALSE;
3417 data.cookie = ++pad->priv->probe_cookie;
3420 (info->type & GST_PAD_PROBE_TYPE_BLOCK) == GST_PAD_PROBE_TYPE_BLOCK;
3423 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3424 "do probes cookie %u", data.cookie);
3425 cookie = pad->priv->probe_list_cookie;
3427 g_hook_list_marshal (&pad->probes, TRUE,
3428 (GHookMarshaller) probe_hook_marshal, &data);
3430 /* if the list changed, call the new callbacks (they will not have their
3431 * cookie set to data.cookie */
3432 if (cookie != pad->priv->probe_list_cookie) {
3433 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3434 "probe list changed, restarting");
3438 /* the first item that dropped will stop the hooks and then we drop here */
3442 /* if no handler matched and we are blocking, let the item pass */
3443 if (!data.marshalled && is_block)
3446 /* At this point, all handlers returned either OK or PASS. If one handler
3447 * returned PASS, let the item pass */
3452 while (GST_PAD_IS_BLOCKED (pad)) {
3453 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3454 "we are blocked %d times", pad->num_blocked);
3456 /* we might have released the lock */
3457 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
3460 /* now we block the streaming thread. It can be unlocked when we
3461 * deactivate the pad (which will also set the FLUSHING flag) or
3462 * when the pad is unblocked. A flushing event will also unblock
3463 * the pad after setting the FLUSHING flag. */
3464 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3465 "Waiting to be unblocked or set flushing");
3466 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_BLOCKING);
3467 GST_PAD_BLOCK_WAIT (pad);
3468 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_BLOCKING);
3469 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "We got unblocked");
3471 /* if the list changed, call the new callbacks (they will not have their
3472 * cookie set to data.cookie */
3473 if (cookie != pad->priv->probe_list_cookie) {
3474 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3475 "probe list changed, restarting");
3479 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
3489 GST_DEBUG_OBJECT (pad, "pad is flushing");
3490 return GST_FLOW_FLUSHING;
3494 GST_DEBUG_OBJECT (pad, "data is dropped");
3495 return GST_FLOW_CUSTOM_SUCCESS;
3499 /* FIXME : Should we return FLOW_OK or the defaultval ?? */
3500 GST_DEBUG_OBJECT (pad, "data is passed");
3508 * gst_pad_get_offset:
3511 * Get the offset applied to the running time of @pad. @pad has to be a source
3514 * Returns: the offset.
3517 gst_pad_get_offset (GstPad * pad)
3521 g_return_val_if_fail (GST_IS_PAD (pad), 0);
3523 GST_OBJECT_LOCK (pad);
3524 result = pad->offset;
3525 GST_OBJECT_UNLOCK (pad);
3531 mark_event_not_received (GstPad * pad, PadEvent * ev, gpointer user_data)
3533 ev->received = FALSE;
3538 * gst_pad_set_offset:
3540 * @offset: the offset
3542 * Set the offset that will be applied to the running time of @pad.
3545 gst_pad_set_offset (GstPad * pad, gint64 offset)
3547 g_return_if_fail (GST_IS_PAD (pad));
3549 GST_OBJECT_LOCK (pad);
3550 /* if nothing changed, do nothing */
3551 if (pad->offset == offset)
3554 pad->offset = offset;
3555 GST_DEBUG_OBJECT (pad, "changed offset to %" G_GINT64_FORMAT, offset);
3557 /* resend all sticky events with updated offset on next buffer push */
3558 events_foreach (pad, mark_event_not_received, NULL);
3559 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3562 GST_OBJECT_UNLOCK (pad);
3569 /* If TRUE and ret is not OK this means
3570 * that pushing the EOS event failed
3574 /* If called for an event this is
3575 * the event that would be pushed
3576 * next. Don't forward sticky events
3577 * that would come after that */
3581 /* should be called with pad LOCK */
3583 push_sticky (GstPad * pad, PadEvent * ev, gpointer user_data)
3585 PushStickyData *data = user_data;
3586 GstEvent *event = ev->event;
3589 GST_DEBUG_OBJECT (pad, "event %s was already received",
3590 GST_EVENT_TYPE_NAME (event));
3594 /* If we're called because of an sticky event, only forward
3595 * events that would come before this new event and the
3597 if (data->event && GST_EVENT_IS_STICKY (data->event) &&
3598 GST_EVENT_TYPE (data->event) <= GST_EVENT_SEGMENT &&
3599 GST_EVENT_TYPE (data->event) < GST_EVENT_TYPE (event)) {
3600 data->ret = GST_FLOW_CUSTOM_SUCCESS_1;
3602 data->ret = gst_pad_push_event_unchecked (pad, gst_event_ref (event),
3603 GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM);
3606 switch (data->ret) {
3608 ev->received = TRUE;
3609 GST_DEBUG_OBJECT (pad, "event %s marked received",
3610 GST_EVENT_TYPE_NAME (event));
3612 case GST_FLOW_CUSTOM_SUCCESS:
3613 /* we can't assume the event is received when it was dropped */
3614 GST_DEBUG_OBJECT (pad, "event %s was dropped, mark pending",
3615 GST_EVENT_TYPE_NAME (event));
3616 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3617 data->ret = GST_FLOW_OK;
3619 case GST_FLOW_CUSTOM_SUCCESS_1:
3620 /* event was ignored and should be sent later */
3621 GST_DEBUG_OBJECT (pad, "event %s was ignored, mark pending",
3622 GST_EVENT_TYPE_NAME (event));
3623 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3624 data->ret = GST_FLOW_OK;
3626 case GST_FLOW_NOT_LINKED:
3627 /* not linked is not a problem, we are sticky so the event will be
3628 * sent later but only for non-EOS events */
3629 GST_DEBUG_OBJECT (pad, "pad was not linked, mark pending");
3630 if (GST_EVENT_TYPE (event) != GST_EVENT_EOS)
3631 data->ret = GST_FLOW_OK;
3632 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3635 GST_DEBUG_OBJECT (pad, "result %s, mark pending events",
3636 gst_flow_get_name (data->ret));
3637 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3641 if (data->ret != GST_FLOW_OK && GST_EVENT_TYPE (event) == GST_EVENT_EOS)
3642 data->was_eos = TRUE;
3644 return data->ret == GST_FLOW_OK;
3647 /* check sticky events and push them when needed. should be called
3649 static inline GstFlowReturn
3650 check_sticky (GstPad * pad, GstEvent * event)
3652 PushStickyData data = { GST_FLOW_OK, FALSE, event };
3654 if (G_UNLIKELY (GST_PAD_HAS_PENDING_EVENTS (pad))) {
3655 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3657 GST_DEBUG_OBJECT (pad, "pushing all sticky events");
3658 events_foreach (pad, push_sticky, &data);
3660 /* If there's an EOS event we must push it downstream
3661 * even if sending a previous sticky event failed.
3662 * Otherwise the pipeline might wait forever for EOS.
3664 * Only do this if pushing another event than the EOS
3667 if (data.ret != GST_FLOW_OK && !data.was_eos) {
3668 PadEvent *ev = find_event_by_type (pad, GST_EVENT_EOS, 0);
3670 if (ev && !ev->received) {
3671 data.ret = gst_pad_push_event_unchecked (pad, gst_event_ref (ev->event),
3672 GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM);
3673 /* the event could have been dropped. Because this can only
3674 * happen if the user asked for it, it's not an error */
3675 if (data.ret == GST_FLOW_CUSTOM_SUCCESS)
3676 data.ret = GST_FLOW_OK;
3686 * @pad: a #GstPad to invoke the default query on.
3687 * @query: (transfer none): the #GstQuery to perform.
3689 * Dispatches a query to a pad. The query should have been allocated by the
3690 * caller via one of the type-specific allocation functions. The element that
3691 * the pad belongs to is responsible for filling the query with an appropriate
3692 * response, which should then be parsed with a type-specific query parsing
3695 * Again, the caller is responsible for both the allocation and deallocation of
3696 * the query structure.
3698 * Please also note that some queries might need a running pipeline to work.
3700 * Returns: %TRUE if the query could be performed.
3703 gst_pad_query (GstPad * pad, GstQuery * query)
3706 gboolean res, serialized;
3707 GstPadQueryFunction func;
3708 GstPadProbeType type;
3711 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
3712 g_return_val_if_fail (GST_IS_QUERY (query), FALSE);
3714 if (GST_PAD_IS_SRC (pad)) {
3715 if (G_UNLIKELY (!GST_QUERY_IS_UPSTREAM (query)))
3716 goto wrong_direction;
3717 type = GST_PAD_PROBE_TYPE_QUERY_UPSTREAM;
3718 } else if (GST_PAD_IS_SINK (pad)) {
3719 if (G_UNLIKELY (!GST_QUERY_IS_DOWNSTREAM (query)))
3720 goto wrong_direction;
3721 type = GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM;
3723 goto unknown_direction;
3725 GST_DEBUG_OBJECT (pad, "doing query %p (%s)", query,
3726 GST_QUERY_TYPE_NAME (query));
3728 serialized = GST_QUERY_IS_SERIALIZED (query);
3729 if (G_UNLIKELY (serialized))
3730 GST_PAD_STREAM_LOCK (pad);
3732 GST_OBJECT_LOCK (pad);
3733 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH |
3734 GST_PAD_PROBE_TYPE_BLOCK, query, probe_stopped);
3735 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH, query, probe_stopped);
3737 ACQUIRE_PARENT (pad, parent, no_parent);
3738 GST_OBJECT_UNLOCK (pad);
3740 if ((func = GST_PAD_QUERYFUNC (pad)) == NULL)
3743 res = func (pad, parent, query);
3745 RELEASE_PARENT (parent);
3747 GST_DEBUG_OBJECT (pad, "sent query %p (%s), result %d", query,
3748 GST_QUERY_TYPE_NAME (query), res);
3753 GST_OBJECT_LOCK (pad);
3754 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PULL, query, probe_stopped);
3755 GST_OBJECT_UNLOCK (pad);
3757 if (G_UNLIKELY (serialized))
3758 GST_PAD_STREAM_UNLOCK (pad);
3765 g_warning ("pad %s:%s query %s in wrong direction",
3766 GST_DEBUG_PAD_NAME (pad), GST_QUERY_TYPE_NAME (query));
3771 g_warning ("pad %s:%s has invalid direction", GST_DEBUG_PAD_NAME (pad));
3776 GST_DEBUG_OBJECT (pad, "had no parent");
3777 GST_OBJECT_UNLOCK (pad);
3778 if (G_UNLIKELY (serialized))
3779 GST_PAD_STREAM_UNLOCK (pad);
3784 GST_DEBUG_OBJECT (pad, "had no query function");
3785 RELEASE_PARENT (parent);
3786 if (G_UNLIKELY (serialized))
3787 GST_PAD_STREAM_UNLOCK (pad);
3792 GST_DEBUG_OBJECT (pad, "query failed");
3793 if (G_UNLIKELY (serialized))
3794 GST_PAD_STREAM_UNLOCK (pad);
3799 GST_DEBUG_OBJECT (pad, "probe stopped: %s", gst_flow_get_name (ret));
3800 GST_OBJECT_UNLOCK (pad);
3801 if (G_UNLIKELY (serialized))
3802 GST_PAD_STREAM_UNLOCK (pad);
3804 /* if a probe dropped, we don't sent it further but assume that the probe
3805 * did not answer the query and return FALSE */
3813 * gst_pad_peer_query:
3814 * @pad: a #GstPad to invoke the peer query on.
3815 * @query: (transfer none): the #GstQuery to perform.
3817 * Performs gst_pad_query() on the peer of @pad.
3819 * The caller is responsible for both the allocation and deallocation of
3820 * the query structure.
3822 * Returns: %TRUE if the query could be performed. This function returns %FALSE
3823 * if @pad has no peer.
3826 gst_pad_peer_query (GstPad * pad, GstQuery * query)
3829 GstPadProbeType type;
3830 gboolean res, serialized;
3833 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
3834 g_return_val_if_fail (GST_IS_QUERY (query), FALSE);
3836 if (GST_PAD_IS_SRC (pad)) {
3837 if (G_UNLIKELY (!GST_QUERY_IS_DOWNSTREAM (query)))
3838 goto wrong_direction;
3839 type = GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM;
3840 } else if (GST_PAD_IS_SINK (pad)) {
3841 if (G_UNLIKELY (!GST_QUERY_IS_UPSTREAM (query)))
3842 goto wrong_direction;
3843 type = GST_PAD_PROBE_TYPE_QUERY_UPSTREAM;
3845 goto unknown_direction;
3847 GST_DEBUG_OBJECT (pad, "peer query %p (%s)", query,
3848 GST_QUERY_TYPE_NAME (query));
3850 serialized = GST_QUERY_IS_SERIALIZED (query);
3852 GST_OBJECT_LOCK (pad);
3853 if (GST_PAD_IS_SRC (pad) && serialized) {
3854 /* all serialized queries on the srcpad trigger push of
3856 if (check_sticky (pad, NULL) != GST_FLOW_OK)
3860 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH |
3861 GST_PAD_PROBE_TYPE_BLOCK, query, probe_stopped);
3862 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH, query, probe_stopped);
3864 peerpad = GST_PAD_PEER (pad);
3865 if (G_UNLIKELY (peerpad == NULL))
3868 gst_object_ref (peerpad);
3869 GST_OBJECT_UNLOCK (pad);
3871 res = gst_pad_query (peerpad, query);
3873 gst_object_unref (peerpad);
3878 GST_OBJECT_LOCK (pad);
3879 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PULL, query, probe_stopped);
3880 GST_OBJECT_UNLOCK (pad);
3887 g_warning ("pad %s:%s query %s in wrong direction",
3888 GST_DEBUG_PAD_NAME (pad), GST_QUERY_TYPE_NAME (query));
3893 g_warning ("pad %s:%s has invalid direction", GST_DEBUG_PAD_NAME (pad));
3898 GST_WARNING_OBJECT (pad, "could not send sticky events");
3899 GST_OBJECT_UNLOCK (pad);
3904 GST_INFO_OBJECT (pad, "pad has no peer");
3905 GST_OBJECT_UNLOCK (pad);
3910 GST_DEBUG_OBJECT (pad, "query failed");
3915 GST_DEBUG_OBJECT (pad, "probe stopped: %s", gst_flow_get_name (ret));
3916 GST_OBJECT_UNLOCK (pad);
3918 /* if a probe dropped, we don't sent it further but assume that the probe
3919 * did not answer the query and return FALSE */
3926 /**********************************************************************
3927 * Data passing functions
3930 /* this is the chain function that does not perform the additional argument
3931 * checking for that little extra speed.
3933 static inline GstFlowReturn
3934 gst_pad_chain_data_unchecked (GstPad * pad, GstPadProbeType type, void *data)
3939 GST_PAD_STREAM_LOCK (pad);
3941 GST_OBJECT_LOCK (pad);
3942 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
3945 if (G_UNLIKELY (GST_PAD_IS_EOS (pad)))
3948 if (G_UNLIKELY (GST_PAD_MODE (pad) != GST_PAD_MODE_PUSH))
3951 #ifndef G_DISABLE_ASSERT
3952 if (G_UNLIKELY (pad->priv->last_cookie != pad->priv->events_cookie)) {
3953 if (!find_event_by_type (pad, GST_EVENT_STREAM_START, 0)) {
3955 ":%s:<%s:%s> Got data flow before stream-start event",
3956 G_STRFUNC, GST_DEBUG_PAD_NAME (pad));
3958 if (!find_event_by_type (pad, GST_EVENT_SEGMENT, 0)) {
3960 ":%s:<%s:%s> Got data flow before segment event",
3961 G_STRFUNC, GST_DEBUG_PAD_NAME (pad));
3963 pad->priv->last_cookie = pad->priv->events_cookie;
3967 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_BLOCK, data, probe_stopped);
3969 PROBE_PUSH (pad, type, data, probe_stopped);
3971 parent = GST_OBJECT_PARENT (pad);
3972 GST_OBJECT_UNLOCK (pad);
3974 /* NOTE: we read the chainfunc unlocked.
3975 * we cannot hold the lock for the pad so we might send
3976 * the data to the wrong function. This is not really a
3977 * problem since functions are assigned at creation time
3978 * and don't change that often... */
3979 if (G_LIKELY (type & GST_PAD_PROBE_TYPE_BUFFER)) {
3980 GstPadChainFunction chainfunc;
3982 if (G_UNLIKELY ((chainfunc = GST_PAD_CHAINFUNC (pad)) == NULL))
3985 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3986 "calling chainfunction &%s with buffer %" GST_PTR_FORMAT,
3987 GST_DEBUG_FUNCPTR_NAME (chainfunc), GST_BUFFER (data));
3989 ret = chainfunc (pad, parent, GST_BUFFER_CAST (data));
3991 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3992 "called chainfunction &%s with buffer %p, returned %s",
3993 GST_DEBUG_FUNCPTR_NAME (chainfunc), data, gst_flow_get_name (ret));
3995 GstPadChainListFunction chainlistfunc;
3997 if (G_UNLIKELY ((chainlistfunc = GST_PAD_CHAINLISTFUNC (pad)) == NULL))
4000 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4001 "calling chainlistfunction &%s",
4002 GST_DEBUG_FUNCPTR_NAME (chainlistfunc));
4004 ret = chainlistfunc (pad, parent, GST_BUFFER_LIST_CAST (data));
4006 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4007 "called chainlistfunction &%s, returned %s",
4008 GST_DEBUG_FUNCPTR_NAME (chainlistfunc), gst_flow_get_name (ret));
4011 GST_PAD_STREAM_UNLOCK (pad);
4018 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4019 "chaining, but pad was flushing");
4020 GST_OBJECT_UNLOCK (pad);
4021 GST_PAD_STREAM_UNLOCK (pad);
4022 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4023 return GST_FLOW_FLUSHING;
4027 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "chaining, but pad was EOS");
4028 GST_OBJECT_UNLOCK (pad);
4029 GST_PAD_STREAM_UNLOCK (pad);
4030 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4031 return GST_FLOW_EOS;
4035 g_critical ("chain on pad %s:%s but it was not in push mode",
4036 GST_DEBUG_PAD_NAME (pad));
4037 GST_OBJECT_UNLOCK (pad);
4038 GST_PAD_STREAM_UNLOCK (pad);
4039 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4040 return GST_FLOW_ERROR;
4044 GST_OBJECT_UNLOCK (pad);
4045 GST_PAD_STREAM_UNLOCK (pad);
4046 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4049 case GST_FLOW_CUSTOM_SUCCESS:
4050 GST_DEBUG_OBJECT (pad, "dropped buffer");
4054 GST_DEBUG_OBJECT (pad, "an error occurred %s", gst_flow_get_name (ret));
4061 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4062 g_critical ("chain on pad %s:%s but it has no chainfunction",
4063 GST_DEBUG_PAD_NAME (pad));
4064 GST_PAD_STREAM_UNLOCK (pad);
4065 return GST_FLOW_NOT_SUPPORTED;
4071 * @pad: a sink #GstPad, returns GST_FLOW_ERROR if not.
4072 * @buffer: (transfer full): the #GstBuffer to send, return GST_FLOW_ERROR
4075 * Chain a buffer to @pad.
4077 * The function returns #GST_FLOW_FLUSHING if the pad was flushing.
4079 * If the buffer type is not acceptable for @pad (as negotiated with a
4080 * preceding GST_EVENT_CAPS event), this function returns
4081 * #GST_FLOW_NOT_NEGOTIATED.
4083 * The function proceeds calling the chain function installed on @pad (see
4084 * gst_pad_set_chain_function()) and the return value of that function is
4085 * returned to the caller. #GST_FLOW_NOT_SUPPORTED is returned if @pad has no
4088 * In all cases, success or failure, the caller loses its reference to @buffer
4089 * after calling this function.
4091 * Returns: a #GstFlowReturn from the pad.
4096 gst_pad_chain (GstPad * pad, GstBuffer * buffer)
4098 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4099 g_return_val_if_fail (GST_PAD_IS_SINK (pad), GST_FLOW_ERROR);
4100 g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR);
4102 return gst_pad_chain_data_unchecked (pad,
4103 GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_PUSH, buffer);
4106 static GstFlowReturn
4107 gst_pad_chain_list_default (GstPad * pad, GstObject * parent,
4108 GstBufferList * list)
4114 GST_INFO_OBJECT (pad, "chaining each buffer in list individually");
4116 len = gst_buffer_list_length (list);
4119 for (i = 0; i < len; i++) {
4120 buffer = gst_buffer_list_get (list, i);
4122 gst_pad_chain_data_unchecked (pad,
4123 GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_PUSH,
4124 gst_buffer_ref (buffer));
4125 if (ret != GST_FLOW_OK)
4128 gst_buffer_list_unref (list);
4134 * gst_pad_chain_list:
4135 * @pad: a sink #GstPad, returns GST_FLOW_ERROR if not.
4136 * @list: (transfer full): the #GstBufferList to send, return GST_FLOW_ERROR
4139 * Chain a bufferlist to @pad.
4141 * The function returns #GST_FLOW_FLUSHING if the pad was flushing.
4143 * If @pad was not negotiated properly with a CAPS event, this function
4144 * returns #GST_FLOW_NOT_NEGOTIATED.
4146 * The function proceeds calling the chainlist function installed on @pad (see
4147 * gst_pad_set_chain_list_function()) and the return value of that function is
4148 * returned to the caller. #GST_FLOW_NOT_SUPPORTED is returned if @pad has no
4149 * chainlist function.
4151 * In all cases, success or failure, the caller loses its reference to @list
4152 * after calling this function.
4156 * Returns: a #GstFlowReturn from the pad.
4159 gst_pad_chain_list (GstPad * pad, GstBufferList * list)
4161 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4162 g_return_val_if_fail (GST_PAD_IS_SINK (pad), GST_FLOW_ERROR);
4163 g_return_val_if_fail (GST_IS_BUFFER_LIST (list), GST_FLOW_ERROR);
4165 return gst_pad_chain_data_unchecked (pad,
4166 GST_PAD_PROBE_TYPE_BUFFER_LIST | GST_PAD_PROBE_TYPE_PUSH, list);
4169 static GstFlowReturn
4170 gst_pad_push_data (GstPad * pad, GstPadProbeType type, void *data)
4175 GST_OBJECT_LOCK (pad);
4176 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
4179 if (G_UNLIKELY (GST_PAD_IS_EOS (pad)))
4182 if (G_UNLIKELY (GST_PAD_MODE (pad) != GST_PAD_MODE_PUSH))
4185 #ifndef G_DISABLE_ASSERT
4186 if (G_UNLIKELY (pad->priv->last_cookie != pad->priv->events_cookie)) {
4187 if (!find_event_by_type (pad, GST_EVENT_STREAM_START, 0)) {
4189 ":%s:<%s:%s> Got data flow before stream-start event",
4190 G_STRFUNC, GST_DEBUG_PAD_NAME (pad));
4192 if (!find_event_by_type (pad, GST_EVENT_SEGMENT, 0)) {
4194 ":%s:<%s:%s> Got data flow before segment event",
4195 G_STRFUNC, GST_DEBUG_PAD_NAME (pad));
4197 pad->priv->last_cookie = pad->priv->events_cookie;
4201 if (G_UNLIKELY ((ret = check_sticky (pad, NULL))) != GST_FLOW_OK)
4204 /* do block probes */
4205 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_BLOCK, data, probe_stopped);
4207 /* recheck sticky events because the probe might have cause a relink */
4208 if (G_UNLIKELY ((ret = check_sticky (pad, NULL))) != GST_FLOW_OK)
4211 /* do post-blocking probes */
4212 PROBE_PUSH (pad, type, data, probe_stopped);
4214 if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL))
4217 /* take ref to peer pad before releasing the lock */
4218 gst_object_ref (peer);
4220 GST_OBJECT_UNLOCK (pad);
4222 ret = gst_pad_chain_data_unchecked (peer, type, data);
4224 gst_object_unref (peer);
4226 GST_OBJECT_LOCK (pad);
4227 pad->ABI.abi.last_flowret = ret;
4229 if (pad->priv->using == 0) {
4230 /* pad is not active anymore, trigger idle callbacks */
4231 PROBE_NO_DATA (pad, GST_PAD_PROBE_TYPE_PUSH | GST_PAD_PROBE_TYPE_IDLE,
4232 probe_stopped, ret);
4234 GST_OBJECT_UNLOCK (pad);
4238 /* ERROR recovery here */
4242 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4243 "pushing, but pad was flushing");
4244 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
4245 GST_OBJECT_UNLOCK (pad);
4246 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4247 return GST_FLOW_FLUSHING;
4251 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pushing, but pad was EOS");
4252 pad->ABI.abi.last_flowret = GST_FLOW_EOS;
4253 GST_OBJECT_UNLOCK (pad);
4254 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4255 return GST_FLOW_EOS;
4259 g_critical ("pushing on pad %s:%s but it was not activated in push mode",
4260 GST_DEBUG_PAD_NAME (pad));
4261 pad->ABI.abi.last_flowret = GST_FLOW_ERROR;
4262 GST_OBJECT_UNLOCK (pad);
4263 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4264 return GST_FLOW_ERROR;
4268 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4269 "error pushing events, return %s", gst_flow_get_name (ret));
4270 pad->ABI.abi.last_flowret = ret;
4271 GST_OBJECT_UNLOCK (pad);
4272 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4277 GST_OBJECT_UNLOCK (pad);
4278 pad->ABI.abi.last_flowret =
4279 ret == GST_FLOW_CUSTOM_SUCCESS ? GST_FLOW_OK : ret;
4281 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4284 case GST_FLOW_CUSTOM_SUCCESS:
4285 GST_DEBUG_OBJECT (pad, "dropped buffer");
4289 GST_DEBUG_OBJECT (pad, "an error occurred %s", gst_flow_get_name (ret));
4296 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4297 "pushing, but it was not linked");
4298 pad->ABI.abi.last_flowret = GST_FLOW_NOT_LINKED;
4299 GST_OBJECT_UNLOCK (pad);
4300 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4301 return GST_FLOW_NOT_LINKED;
4307 * @pad: a source #GstPad, returns #GST_FLOW_ERROR if not.
4308 * @buffer: (transfer full): the #GstBuffer to push returns GST_FLOW_ERROR
4311 * Pushes a buffer to the peer of @pad.
4313 * This function will call installed block probes before triggering any
4314 * installed data probes.
4316 * The function proceeds calling gst_pad_chain() on the peer pad and returns
4317 * the value from that function. If @pad has no peer, #GST_FLOW_NOT_LINKED will
4320 * In all cases, success or failure, the caller loses its reference to @buffer
4321 * after calling this function.
4323 * Returns: a #GstFlowReturn from the peer pad.
4328 gst_pad_push (GstPad * pad, GstBuffer * buffer)
4330 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4331 g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR);
4332 g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR);
4334 return gst_pad_push_data (pad,
4335 GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_PUSH, buffer);
4339 * gst_pad_push_list:
4340 * @pad: a source #GstPad, returns #GST_FLOW_ERROR if not.
4341 * @list: (transfer full): the #GstBufferList to push returns GST_FLOW_ERROR
4344 * Pushes a buffer list to the peer of @pad.
4346 * This function will call installed block probes before triggering any
4347 * installed data probes.
4349 * The function proceeds calling the chain function on the peer pad and returns
4350 * the value from that function. If @pad has no peer, #GST_FLOW_NOT_LINKED will
4351 * be returned. If the peer pad does not have any installed chainlist function
4352 * every group buffer of the list will be merged into a normal #GstBuffer and
4353 * chained via gst_pad_chain().
4355 * In all cases, success or failure, the caller loses its reference to @list
4356 * after calling this function.
4358 * Returns: a #GstFlowReturn from the peer pad.
4363 gst_pad_push_list (GstPad * pad, GstBufferList * list)
4365 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4366 g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR);
4367 g_return_val_if_fail (GST_IS_BUFFER_LIST (list), GST_FLOW_ERROR);
4369 return gst_pad_push_data (pad,
4370 GST_PAD_PROBE_TYPE_BUFFER_LIST | GST_PAD_PROBE_TYPE_PUSH, list);
4373 static GstFlowReturn
4374 gst_pad_get_range_unchecked (GstPad * pad, guint64 offset, guint size,
4375 GstBuffer ** buffer)
4378 GstPadGetRangeFunction getrangefunc;
4382 GST_PAD_STREAM_LOCK (pad);
4384 GST_OBJECT_LOCK (pad);
4385 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
4388 if (G_UNLIKELY (GST_PAD_MODE (pad) != GST_PAD_MODE_PULL))
4391 if (G_UNLIKELY ((ret = check_sticky (pad, NULL))) != GST_FLOW_OK)
4396 /* when one of the probes returns DROPPED, probe_stopped will be called
4397 * and we skip calling the getrange function, res_buf should then contain a
4398 * valid result buffer */
4399 PROBE_PULL (pad, GST_PAD_PROBE_TYPE_PULL | GST_PAD_PROBE_TYPE_BLOCK,
4400 res_buf, offset, size, probe_stopped);
4402 /* recheck sticky events because the probe might have cause a relink */
4403 if (G_UNLIKELY ((ret = check_sticky (pad, NULL))) != GST_FLOW_OK)
4406 ACQUIRE_PARENT (pad, parent, no_parent);
4407 GST_OBJECT_UNLOCK (pad);
4409 if (G_UNLIKELY ((getrangefunc = GST_PAD_GETRANGEFUNC (pad)) == NULL))
4412 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4413 "calling getrangefunc %s, offset %"
4414 G_GUINT64_FORMAT ", size %u",
4415 GST_DEBUG_FUNCPTR_NAME (getrangefunc), offset, size);
4417 ret = getrangefunc (pad, parent, offset, size, &res_buf);
4419 RELEASE_PARENT (parent);
4421 GST_OBJECT_LOCK (pad);
4422 if (G_UNLIKELY (ret != GST_FLOW_OK))
4423 goto get_range_failed;
4425 /* can only fire the signal if we have a valid buffer */
4427 PROBE_PULL (pad, GST_PAD_PROBE_TYPE_PULL | GST_PAD_PROBE_TYPE_BUFFER,
4428 res_buf, offset, size, probe_stopped_unref);
4429 pad->ABI.abi.last_flowret = ret;
4430 GST_OBJECT_UNLOCK (pad);
4432 GST_PAD_STREAM_UNLOCK (pad);
4441 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4442 "getrange, but pad was flushing");
4443 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
4444 GST_OBJECT_UNLOCK (pad);
4445 GST_PAD_STREAM_UNLOCK (pad);
4446 return GST_FLOW_FLUSHING;
4450 g_critical ("getrange on pad %s:%s but it was not activated in pull mode",
4451 GST_DEBUG_PAD_NAME (pad));
4452 pad->ABI.abi.last_flowret = GST_FLOW_ERROR;
4453 GST_OBJECT_UNLOCK (pad);
4454 GST_PAD_STREAM_UNLOCK (pad);
4455 return GST_FLOW_ERROR;
4459 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "error pushing events");
4460 pad->ABI.abi.last_flowret = ret;
4461 GST_OBJECT_UNLOCK (pad);
4462 GST_PAD_STREAM_UNLOCK (pad);
4467 GST_DEBUG_OBJECT (pad, "no parent");
4468 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
4469 GST_OBJECT_UNLOCK (pad);
4470 GST_PAD_STREAM_UNLOCK (pad);
4471 return GST_FLOW_FLUSHING;
4475 g_critical ("getrange on pad %s:%s but it has no getrangefunction",
4476 GST_DEBUG_PAD_NAME (pad));
4477 RELEASE_PARENT (parent);
4478 GST_PAD_STREAM_UNLOCK (pad);
4479 return GST_FLOW_NOT_SUPPORTED;
4483 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4484 "probe returned %s", gst_flow_get_name (ret));
4485 if (ret == GST_FLOW_CUSTOM_SUCCESS) {
4487 /* the probe filled the buffer and asks us to not call the getrange
4488 * anymore, we continue with the post probes then. */
4489 GST_DEBUG_OBJECT (pad, "handled buffer");
4493 /* no buffer, we are EOS */
4494 GST_DEBUG_OBJECT (pad, "no buffer, return EOS");
4498 pad->ABI.abi.last_flowret = ret;
4499 GST_OBJECT_UNLOCK (pad);
4500 GST_PAD_STREAM_UNLOCK (pad);
4504 probe_stopped_unref:
4506 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4507 "probe returned %s", gst_flow_get_name (ret));
4508 /* if we drop here, it signals EOS */
4509 if (ret == GST_FLOW_CUSTOM_SUCCESS)
4511 pad->ABI.abi.last_flowret = ret;
4512 GST_OBJECT_UNLOCK (pad);
4513 GST_PAD_STREAM_UNLOCK (pad);
4514 if (*buffer == NULL)
4515 gst_buffer_unref (res_buf);
4520 pad->ABI.abi.last_flowret = ret;
4521 GST_OBJECT_UNLOCK (pad);
4522 GST_PAD_STREAM_UNLOCK (pad);
4523 GST_CAT_LEVEL_LOG (GST_CAT_SCHEDULING,
4524 (ret >= GST_FLOW_EOS) ? GST_LEVEL_INFO : GST_LEVEL_WARNING,
4525 pad, "getrange failed, flow: %s", gst_flow_get_name (ret));
4531 * gst_pad_get_range:
4532 * @pad: a src #GstPad, returns #GST_FLOW_ERROR if not.
4533 * @offset: The start offset of the buffer
4534 * @size: The length of the buffer
4535 * @buffer: (out callee-allocates): a pointer to hold the #GstBuffer,
4536 * returns #GST_FLOW_ERROR if %NULL.
4538 * When @pad is flushing this function returns #GST_FLOW_FLUSHING
4539 * immediately and @buffer is %NULL.
4541 * Calls the getrange function of @pad, see #GstPadGetRangeFunction for a
4542 * description of a getrange function. If @pad has no getrange function
4543 * installed (see gst_pad_set_getrange_function()) this function returns
4544 * #GST_FLOW_NOT_SUPPORTED.
4546 * If @buffer points to a variable holding %NULL, a valid new #GstBuffer will be
4547 * placed in @buffer when this function returns #GST_FLOW_OK. The new buffer
4548 * must be freed with gst_buffer_unref() after usage.
4550 * When @buffer points to a variable that points to a valid #GstBuffer, the
4551 * buffer will be filled with the result data when this function returns
4552 * #GST_FLOW_OK. If the provided buffer is larger than @size, only
4553 * @size bytes will be filled in the result buffer and its size will be updated
4556 * Note that less than @size bytes can be returned in @buffer when, for example,
4557 * an EOS condition is near or when @buffer is not large enough to hold @size
4558 * bytes. The caller should check the result buffer size to get the result size.
4560 * When this function returns any other result value than #GST_FLOW_OK, @buffer
4561 * will be unchanged.
4563 * This is a lowlevel function. Usually gst_pad_pull_range() is used.
4565 * Returns: a #GstFlowReturn from the pad.
4570 gst_pad_get_range (GstPad * pad, guint64 offset, guint size,
4571 GstBuffer ** buffer)
4573 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4574 g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR);
4575 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
4576 g_return_val_if_fail (*buffer == NULL || (GST_IS_BUFFER (*buffer)
4577 && gst_buffer_get_size (*buffer) >= size), GST_FLOW_ERROR);
4579 return gst_pad_get_range_unchecked (pad, offset, size, buffer);
4583 * gst_pad_pull_range:
4584 * @pad: a sink #GstPad, returns GST_FLOW_ERROR if not.
4585 * @offset: The start offset of the buffer
4586 * @size: The length of the buffer
4587 * @buffer: (out callee-allocates): a pointer to hold the #GstBuffer, returns
4588 * GST_FLOW_ERROR if %NULL.
4590 * Pulls a @buffer from the peer pad or fills up a provided buffer.
4592 * This function will first trigger the pad block signal if it was
4595 * When @pad is not linked #GST_FLOW_NOT_LINKED is returned else this
4596 * function returns the result of gst_pad_get_range() on the peer pad.
4597 * See gst_pad_get_range() for a list of return values and for the
4598 * semantics of the arguments of this function.
4600 * If @buffer points to a variable holding %NULL, a valid new #GstBuffer will be
4601 * placed in @buffer when this function returns #GST_FLOW_OK. The new buffer
4602 * must be freed with gst_buffer_unref() after usage. When this function
4603 * returns any other result value, @buffer will still point to %NULL.
4605 * When @buffer points to a variable that points to a valid #GstBuffer, the
4606 * buffer will be filled with the result data when this function returns
4607 * #GST_FLOW_OK. When this function returns any other result value,
4608 * @buffer will be unchanged. If the provided buffer is larger than @size, only
4609 * @size bytes will be filled in the result buffer and its size will be updated
4612 * Note that less than @size bytes can be returned in @buffer when, for example,
4613 * an EOS condition is near or when @buffer is not large enough to hold @size
4614 * bytes. The caller should check the result buffer size to get the result size.
4616 * Returns: a #GstFlowReturn from the peer pad.
4621 gst_pad_pull_range (GstPad * pad, guint64 offset, guint size,
4622 GstBuffer ** buffer)
4628 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4629 g_return_val_if_fail (GST_PAD_IS_SINK (pad), GST_FLOW_ERROR);
4630 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
4631 g_return_val_if_fail (*buffer == NULL || (GST_IS_BUFFER (*buffer)
4632 && gst_buffer_get_size (*buffer) >= size), GST_FLOW_ERROR);
4634 GST_OBJECT_LOCK (pad);
4635 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
4638 if (G_UNLIKELY (GST_PAD_MODE (pad) != GST_PAD_MODE_PULL))
4643 /* when one of the probes returns DROPPED, probe_stopped will be
4644 * called and we skip calling the peer getrange function. *buffer should then
4645 * contain a valid buffer */
4646 PROBE_PULL (pad, GST_PAD_PROBE_TYPE_PULL | GST_PAD_PROBE_TYPE_BLOCK,
4647 res_buf, offset, size, probe_stopped);
4649 if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL))
4652 gst_object_ref (peer);
4654 GST_OBJECT_UNLOCK (pad);
4656 ret = gst_pad_get_range_unchecked (peer, offset, size, &res_buf);
4658 gst_object_unref (peer);
4660 GST_OBJECT_LOCK (pad);
4662 pad->ABI.abi.last_flowret = ret;
4663 if (pad->priv->using == 0) {
4664 /* pad is not active anymore, trigger idle callbacks */
4665 PROBE_NO_DATA (pad, GST_PAD_PROBE_TYPE_PULL | GST_PAD_PROBE_TYPE_IDLE,
4666 probe_stopped_unref, ret);
4669 if (G_UNLIKELY (ret != GST_FLOW_OK))
4670 goto pull_range_failed;
4673 PROBE_PULL (pad, GST_PAD_PROBE_TYPE_PULL | GST_PAD_PROBE_TYPE_BUFFER,
4674 res_buf, offset, size, probe_stopped_unref);
4676 GST_OBJECT_UNLOCK (pad);
4682 /* ERROR recovery here */
4685 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4686 "pullrange, but pad was flushing");
4687 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
4688 GST_OBJECT_UNLOCK (pad);
4689 return GST_FLOW_FLUSHING;
4693 g_critical ("pullrange on pad %s:%s but it was not activated in pull mode",
4694 GST_DEBUG_PAD_NAME (pad));
4695 pad->ABI.abi.last_flowret = GST_FLOW_ERROR;
4696 GST_OBJECT_UNLOCK (pad);
4697 return GST_FLOW_ERROR;
4701 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pre probe returned %s",
4702 gst_flow_get_name (ret));
4703 if (ret == GST_FLOW_CUSTOM_SUCCESS) {
4705 /* the probe filled the buffer and asks us to not forward to the peer
4706 * anymore, we continue with the post probes then */
4707 GST_DEBUG_OBJECT (pad, "handled buffer");
4711 /* no buffer, we are EOS then */
4712 GST_DEBUG_OBJECT (pad, "no buffer, return EOS");
4716 pad->ABI.abi.last_flowret = ret;
4717 GST_OBJECT_UNLOCK (pad);
4722 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4723 "pulling range, but it was not linked");
4724 pad->ABI.abi.last_flowret = GST_FLOW_NOT_LINKED;
4725 GST_OBJECT_UNLOCK (pad);
4726 return GST_FLOW_NOT_LINKED;
4730 pad->ABI.abi.last_flowret = ret;
4731 GST_OBJECT_UNLOCK (pad);
4732 GST_CAT_LEVEL_LOG (GST_CAT_SCHEDULING,
4733 (ret >= GST_FLOW_EOS) ? GST_LEVEL_INFO : GST_LEVEL_WARNING,
4734 pad, "pullrange failed, flow: %s", gst_flow_get_name (ret));
4737 probe_stopped_unref:
4739 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4740 "post probe returned %s", gst_flow_get_name (ret));
4742 /* if we drop here, it signals EOS */
4743 if (ret == GST_FLOW_CUSTOM_SUCCESS)
4746 pad->ABI.abi.last_flowret = ret;
4747 GST_OBJECT_UNLOCK (pad);
4749 if (*buffer == NULL)
4750 gst_buffer_unref (res_buf);
4755 /* must be called with pad object lock */
4756 static GstFlowReturn
4757 store_sticky_event (GstPad * pad, GstEvent * event)
4762 gboolean res = FALSE;
4763 const gchar *name = NULL;
4764 gboolean insert = TRUE;
4766 type = GST_EVENT_TYPE (event);
4768 /* Store all sticky events except SEGMENT/EOS when we're flushing,
4769 * otherwise they can be dropped and nothing would ever resend them.
4770 * Only do that for activated pads though, everything else is a bug!
4772 if (G_UNLIKELY (GST_PAD_MODE (pad) == GST_PAD_MODE_NONE
4773 || (GST_PAD_IS_FLUSHING (pad) && (type == GST_EVENT_SEGMENT
4774 || type == GST_EVENT_EOS))))
4777 if (G_UNLIKELY (GST_PAD_IS_EOS (pad)))
4780 if (type & GST_EVENT_TYPE_STICKY_MULTI)
4781 name = gst_structure_get_name (gst_event_get_structure (event));
4783 events = pad->priv->events;
4786 for (i = 0; i < len; i++) {
4787 PadEvent *ev = &g_array_index (events, PadEvent, i);
4789 if (ev->event == NULL)
4792 if (type == GST_EVENT_TYPE (ev->event)) {
4793 /* matching types, check matching name if needed */
4794 if (name && !gst_event_has_name (ev->event, name))
4798 if ((res = gst_event_replace (&ev->event, event)))
4799 ev->received = FALSE;
4805 if (type < GST_EVENT_TYPE (ev->event) || (type != GST_EVENT_TYPE (ev->event)
4806 && GST_EVENT_TYPE (ev->event) == GST_EVENT_EOS)) {
4807 /* STREAM_START, CAPS and SEGMENT must be delivered in this order. By
4808 * storing the sticky ordered we can check that this is respected. */
4809 if (G_UNLIKELY (GST_EVENT_TYPE (ev->event) <= GST_EVENT_SEGMENT
4810 || GST_EVENT_TYPE (ev->event) == GST_EVENT_EOS))
4812 ":%s:<%s:%s> Sticky event misordering, got '%s' before '%s'",
4813 G_STRFUNC, GST_DEBUG_PAD_NAME (pad),
4814 gst_event_type_get_name (GST_EVENT_TYPE (ev->event)),
4815 gst_event_type_get_name (type));
4821 ev.event = gst_event_ref (event);
4822 ev.received = FALSE;
4823 g_array_insert_val (events, i, ev);
4828 pad->priv->events_cookie++;
4829 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
4831 GST_LOG_OBJECT (pad, "stored sticky event %s", GST_EVENT_TYPE_NAME (event));
4833 switch (GST_EVENT_TYPE (event)) {
4834 case GST_EVENT_CAPS:
4835 GST_OBJECT_UNLOCK (pad);
4837 GST_DEBUG_OBJECT (pad, "notify caps");
4838 g_object_notify_by_pspec ((GObject *) pad, pspec_caps);
4840 GST_OBJECT_LOCK (pad);
4846 if (type == GST_EVENT_EOS) {
4847 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_EOS);
4848 pad->ABI.abi.last_flowret = GST_FLOW_EOS;
4851 return GST_PAD_IS_FLUSHING (pad) ? GST_FLOW_FLUSHING : GST_FLOW_OK;
4856 GST_DEBUG_OBJECT (pad, "pad is flushing");
4857 return GST_FLOW_FLUSHING;
4861 GST_DEBUG_OBJECT (pad, "pad is EOS");
4862 return GST_FLOW_EOS;
4867 * gst_pad_store_sticky_event:
4869 * @event: a #GstEvent
4871 * Store the sticky @event on @pad
4873 * Returns: #GST_FLOW_OK on success, #GST_FLOW_FLUSHING when the pad
4874 * was flushing or #GST_FLOW_EOS when the pad was EOS.
4879 gst_pad_store_sticky_event (GstPad * pad, GstEvent * event)
4883 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
4884 g_return_val_if_fail (GST_IS_EVENT (event), FALSE);
4886 GST_OBJECT_LOCK (pad);
4887 ret = store_sticky_event (pad, event);
4888 GST_OBJECT_UNLOCK (pad);
4894 sticky_changed (GstPad * pad, PadEvent * ev, gpointer user_data)
4896 PushStickyData *data = user_data;
4898 /* Forward all sticky events before our current one that are pending */
4899 if (ev->event != data->event
4900 && GST_EVENT_TYPE (ev->event) < GST_EVENT_TYPE (data->event))
4901 return push_sticky (pad, ev, data);
4906 /* should be called with pad LOCK */
4907 static GstFlowReturn
4908 gst_pad_push_event_unchecked (GstPad * pad, GstEvent * event,
4909 GstPadProbeType type)
4913 GstEventType event_type;
4915 /* pass the adjusted event on. We need to do this even if
4916 * there is no peer pad because of the probes. */
4917 event = apply_pad_offset (pad, event, GST_PAD_IS_SINK (pad));
4919 /* Two checks to be made:
4920 * . (un)set the FLUSHING flag for flushing events,
4921 * . handle pad blocking */
4922 event_type = GST_EVENT_TYPE (event);
4923 switch (event_type) {
4924 case GST_EVENT_FLUSH_START:
4925 GST_PAD_SET_FLUSHING (pad);
4927 GST_PAD_BLOCK_BROADCAST (pad);
4928 type |= GST_PAD_PROBE_TYPE_EVENT_FLUSH;
4930 case GST_EVENT_FLUSH_STOP:
4931 if (G_UNLIKELY (!GST_PAD_IS_ACTIVE (pad)))
4934 GST_PAD_UNSET_FLUSHING (pad);
4936 /* Remove sticky EOS events */
4937 GST_LOG_OBJECT (pad, "Removing pending EOS events");
4938 remove_event_by_type (pad, GST_EVENT_EOS);
4939 remove_event_by_type (pad, GST_EVENT_SEGMENT);
4940 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_EOS);
4941 pad->ABI.abi.last_flowret = GST_FLOW_OK;
4943 type |= GST_PAD_PROBE_TYPE_EVENT_FLUSH;
4947 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
4950 /* No need to check for EOS here as either the caller (gst_pad_push_event())
4951 * checked already or this is called as part of pushing sticky events,
4952 * in which case we still want to forward the EOS event downstream.
4955 switch (GST_EVENT_TYPE (event)) {
4956 case GST_EVENT_RECONFIGURE:
4957 if (GST_PAD_IS_SINK (pad))
4958 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
4963 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH |
4964 GST_PAD_PROBE_TYPE_BLOCK, event, probe_stopped);
4969 /* send probes after modifying the events above */
4970 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH, event, probe_stopped);
4972 /* recheck sticky events because the probe might have cause a relink */
4973 if (GST_PAD_HAS_PENDING_EVENTS (pad) && GST_PAD_IS_SRC (pad)
4974 && (GST_EVENT_IS_SERIALIZED (event)
4975 || GST_EVENT_IS_STICKY (event))) {
4976 PushStickyData data = { GST_FLOW_OK, FALSE, event };
4977 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PENDING_EVENTS);
4979 /* Push all sticky events before our current one
4980 * that have changed */
4981 events_foreach (pad, sticky_changed, &data);
4984 /* now check the peer pad */
4985 peerpad = GST_PAD_PEER (pad);
4986 if (peerpad == NULL)
4989 gst_object_ref (peerpad);
4991 GST_OBJECT_UNLOCK (pad);
4993 GST_LOG_OBJECT (pad, "sending event %p (%s) to peerpad %" GST_PTR_FORMAT,
4994 event, gst_event_type_get_name (event_type), peerpad);
4996 ret = gst_pad_send_event_unchecked (peerpad, event, type);
4998 /* Note: we gave away ownership of the event at this point but we can still
4999 * print the old pointer */
5000 GST_LOG_OBJECT (pad,
5001 "sent event %p (%s) to peerpad %" GST_PTR_FORMAT ", ret %s", event,
5002 gst_event_type_get_name (event_type), peerpad, gst_flow_get_name (ret));
5004 gst_object_unref (peerpad);
5006 GST_OBJECT_LOCK (pad);
5008 if (pad->priv->using == 0) {
5009 /* pad is not active anymore, trigger idle callbacks */
5010 PROBE_NO_DATA (pad, GST_PAD_PROBE_TYPE_PUSH | GST_PAD_PROBE_TYPE_IDLE,
5011 idle_probe_stopped, ret);
5015 /* ERROR handling */
5018 GST_DEBUG_OBJECT (pad, "We're flushing");
5019 gst_event_unref (event);
5020 return GST_FLOW_FLUSHING;
5024 GST_DEBUG_OBJECT (pad, "flush-stop on inactive pad");
5025 gst_event_unref (event);
5026 return GST_FLOW_FLUSHING;
5030 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
5031 gst_event_unref (event);
5034 case GST_FLOW_CUSTOM_SUCCESS:
5035 GST_DEBUG_OBJECT (pad, "dropped event");
5038 GST_DEBUG_OBJECT (pad, "an error occurred %s", gst_flow_get_name (ret));
5045 GST_DEBUG_OBJECT (pad, "Dropping event %s because pad is not linked",
5046 gst_event_type_get_name (GST_EVENT_TYPE (event)));
5047 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
5048 gst_event_unref (event);
5050 /* unlinked pads should not influence latency configuration */
5051 if (event_type == GST_EVENT_LATENCY)
5054 return GST_FLOW_NOT_LINKED;
5058 GST_DEBUG_OBJECT (pad, "Idle probe returned %s", gst_flow_get_name (ret));
5064 * gst_pad_push_event:
5065 * @pad: a #GstPad to push the event to.
5066 * @event: (transfer full): the #GstEvent to send to the pad.
5068 * Sends the event to the peer of the given pad. This function is
5069 * mainly used by elements to send events to their peer
5072 * This function takes ownership of the provided event so you should
5073 * gst_event_ref() it if you want to reuse the event after this call.
5075 * Returns: %TRUE if the event was handled.
5080 gst_pad_push_event (GstPad * pad, GstEvent * event)
5082 gboolean res = FALSE;
5083 GstPadProbeType type;
5084 gboolean sticky, serialized;
5086 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
5087 g_return_val_if_fail (GST_IS_EVENT (event), FALSE);
5089 if (GST_PAD_IS_SRC (pad)) {
5090 if (G_UNLIKELY (!GST_EVENT_IS_DOWNSTREAM (event)))
5091 goto wrong_direction;
5092 type = GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM;
5093 } else if (GST_PAD_IS_SINK (pad)) {
5094 if (G_UNLIKELY (!GST_EVENT_IS_UPSTREAM (event)))
5095 goto wrong_direction;
5096 /* events pushed on sinkpad never are sticky */
5097 type = GST_PAD_PROBE_TYPE_EVENT_UPSTREAM;
5099 goto unknown_direction;
5101 GST_OBJECT_LOCK (pad);
5102 sticky = GST_EVENT_IS_STICKY (event);
5103 serialized = GST_EVENT_IS_SERIALIZED (event);
5106 /* srcpad sticky events are stored immediately, the received flag is set
5107 * to FALSE and will be set to TRUE when we can successfully push the
5108 * event to the peer pad */
5109 switch (store_sticky_event (pad, event)) {
5110 case GST_FLOW_FLUSHING:
5118 if (GST_PAD_IS_SRC (pad) && (serialized || sticky)) {
5119 /* all serialized or sticky events on the srcpad trigger push of
5121 res = (check_sticky (pad, event) == GST_FLOW_OK);
5126 /* other events are pushed right away */
5127 ret = gst_pad_push_event_unchecked (pad, event, type);
5128 /* dropped events by a probe are not an error */
5129 res = (ret == GST_FLOW_OK || ret == GST_FLOW_CUSTOM_SUCCESS);
5131 /* Errors in sticky event pushing are no problem and ignored here
5132 * as they will cause more meaningful errors during data flow.
5133 * For EOS events, that are not followed by data flow, we still
5134 * return FALSE here though.
5136 if (GST_EVENT_TYPE (event) != GST_EVENT_EOS)
5138 gst_event_unref (event);
5140 GST_OBJECT_UNLOCK (pad);
5144 /* ERROR handling */
5147 g_warning ("pad %s:%s pushing %s event in wrong direction",
5148 GST_DEBUG_PAD_NAME (pad), GST_EVENT_TYPE_NAME (event));
5149 gst_event_unref (event);
5154 g_warning ("pad %s:%s has invalid direction", GST_DEBUG_PAD_NAME (pad));
5155 gst_event_unref (event);
5160 GST_DEBUG_OBJECT (pad, "We're flushing");
5161 GST_OBJECT_UNLOCK (pad);
5162 gst_event_unref (event);
5167 GST_DEBUG_OBJECT (pad, "We're EOS");
5168 GST_OBJECT_UNLOCK (pad);
5169 gst_event_unref (event);
5174 /* Check if we can call the event function with the given event */
5175 static GstFlowReturn
5176 pre_eventfunc_check (GstPad * pad, GstEvent * event)
5180 switch (GST_EVENT_TYPE (event)) {
5181 case GST_EVENT_CAPS:
5183 /* backwards compatibility mode for caps */
5184 gst_event_parse_caps (event, &caps);
5186 if (!gst_pad_query_accept_caps (pad, caps))
5198 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
5199 "caps %" GST_PTR_FORMAT " not accepted", caps);
5200 return GST_FLOW_NOT_NEGOTIATED;
5204 static GstFlowReturn
5205 gst_pad_send_event_unchecked (GstPad * pad, GstEvent * event,
5206 GstPadProbeType type)
5209 GstEventType event_type;
5210 gboolean serialized, need_unlock = FALSE, sticky;
5211 GstPadEventFunction eventfunc;
5214 GST_OBJECT_LOCK (pad);
5216 event = apply_pad_offset (pad, event, GST_PAD_IS_SRC (pad));
5218 if (GST_PAD_IS_SINK (pad))
5219 serialized = GST_EVENT_IS_SERIALIZED (event);
5222 sticky = GST_EVENT_IS_STICKY (event);
5223 event_type = GST_EVENT_TYPE (event);
5224 switch (event_type) {
5225 case GST_EVENT_FLUSH_START:
5226 GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad,
5227 "have event type %d (FLUSH_START)", GST_EVENT_TYPE (event));
5229 /* can't even accept a flush begin event when flushing */
5230 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
5233 GST_PAD_SET_FLUSHING (pad);
5234 GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad, "set flush flag");
5236 case GST_EVENT_FLUSH_STOP:
5237 /* we can't accept flush-stop on inactive pads else the flushing flag
5238 * would be cleared and it would look like the pad can accept data.
5239 * Also, some elements restart a streaming thread in flush-stop which we
5240 * can't allow on inactive pads */
5241 if (G_UNLIKELY (!GST_PAD_IS_ACTIVE (pad)))
5244 GST_PAD_UNSET_FLUSHING (pad);
5245 GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad, "cleared flush flag");
5246 /* Remove pending EOS events */
5247 GST_LOG_OBJECT (pad, "Removing pending EOS and SEGMENT events");
5248 remove_event_by_type (pad, GST_EVENT_EOS);
5249 remove_event_by_type (pad, GST_EVENT_SEGMENT);
5250 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_EOS);
5251 pad->ABI.abi.last_flowret = GST_FLOW_OK;
5253 GST_OBJECT_UNLOCK (pad);
5254 /* grab stream lock */
5255 GST_PAD_STREAM_LOCK (pad);
5257 GST_OBJECT_LOCK (pad);
5258 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
5261 case GST_EVENT_RECONFIGURE:
5262 if (GST_PAD_IS_SRC (pad))
5263 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
5265 GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad,
5266 "have event type %" GST_PTR_FORMAT, event);
5268 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
5272 if (G_UNLIKELY (GST_PAD_IS_EOS (pad)))
5275 /* lock order: STREAM_LOCK, LOCK, recheck flushing. */
5276 GST_OBJECT_UNLOCK (pad);
5277 GST_PAD_STREAM_LOCK (pad);
5279 GST_OBJECT_LOCK (pad);
5280 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
5283 if (G_UNLIKELY (GST_PAD_IS_EOS (pad)))
5289 /* now do the probe */
5291 type | GST_PAD_PROBE_TYPE_PUSH |
5292 GST_PAD_PROBE_TYPE_BLOCK, event, probe_stopped);
5294 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH, event, probe_stopped);
5296 if (G_UNLIKELY ((eventfunc = GST_PAD_EVENTFUNC (pad)) == NULL))
5299 ACQUIRE_PARENT (pad, parent, no_parent);
5300 GST_OBJECT_UNLOCK (pad);
5302 ret = pre_eventfunc_check (pad, event);
5303 if (G_UNLIKELY (ret != GST_FLOW_OK))
5304 goto precheck_failed;
5307 gst_event_ref (event);
5309 if (eventfunc (pad, parent, event)) {
5312 /* something went wrong */
5313 switch (event_type) {
5314 case GST_EVENT_CAPS:
5315 ret = GST_FLOW_NOT_NEGOTIATED;
5318 ret = GST_FLOW_ERROR;
5322 RELEASE_PARENT (parent);
5324 GST_DEBUG_OBJECT (pad, "sent event, ret %s", gst_flow_get_name (ret));
5327 if (ret == GST_FLOW_OK) {
5328 GST_OBJECT_LOCK (pad);
5329 /* after the event function accepted the event, we can store the sticky
5330 * event on the pad */
5331 switch (store_sticky_event (pad, event)) {
5332 case GST_FLOW_FLUSHING:
5339 GST_OBJECT_UNLOCK (pad);
5341 gst_event_unref (event);
5345 GST_PAD_STREAM_UNLOCK (pad);
5349 /* ERROR handling */
5352 GST_OBJECT_UNLOCK (pad);
5354 GST_PAD_STREAM_UNLOCK (pad);
5355 GST_CAT_INFO_OBJECT (GST_CAT_EVENT, pad,
5356 "Received event on flushing pad. Discarding");
5357 gst_event_unref (event);
5358 return GST_FLOW_FLUSHING;
5362 GST_OBJECT_UNLOCK (pad);
5364 GST_PAD_STREAM_UNLOCK (pad);
5365 GST_CAT_INFO_OBJECT (GST_CAT_EVENT, pad,
5366 "Received flush-stop on inactive pad. Discarding");
5367 gst_event_unref (event);
5368 return GST_FLOW_FLUSHING;
5372 GST_OBJECT_UNLOCK (pad);
5374 GST_PAD_STREAM_UNLOCK (pad);
5375 GST_CAT_INFO_OBJECT (GST_CAT_EVENT, pad,
5376 "Received event on EOS pad. Discarding");
5377 gst_event_unref (event);
5378 return GST_FLOW_EOS;
5382 GST_OBJECT_UNLOCK (pad);
5384 GST_PAD_STREAM_UNLOCK (pad);
5385 gst_event_unref (event);
5388 case GST_FLOW_CUSTOM_SUCCESS:
5389 GST_DEBUG_OBJECT (pad, "dropped event");
5393 GST_DEBUG_OBJECT (pad, "an error occurred %s", gst_flow_get_name (ret));
5400 g_warning ("pad %s:%s has no event handler, file a bug.",
5401 GST_DEBUG_PAD_NAME (pad));
5402 GST_OBJECT_UNLOCK (pad);
5404 GST_PAD_STREAM_UNLOCK (pad);
5405 gst_event_unref (event);
5406 return GST_FLOW_NOT_SUPPORTED;
5410 GST_DEBUG_OBJECT (pad, "no parent");
5411 GST_OBJECT_UNLOCK (pad);
5413 GST_PAD_STREAM_UNLOCK (pad);
5414 gst_event_unref (event);
5415 return GST_FLOW_FLUSHING;
5419 GST_DEBUG_OBJECT (pad, "pre event check failed");
5420 RELEASE_PARENT (parent);
5422 GST_PAD_STREAM_UNLOCK (pad);
5423 gst_event_unref (event);
5429 * gst_pad_send_event:
5430 * @pad: a #GstPad to send the event to.
5431 * @event: (transfer full): the #GstEvent to send to the pad.
5433 * Sends the event to the pad. This function can be used
5434 * by applications to send events in the pipeline.
5436 * If @pad is a source pad, @event should be an upstream event. If @pad is a
5437 * sink pad, @event should be a downstream event. For example, you would not
5438 * send a #GST_EVENT_EOS on a src pad; EOS events only propagate downstream.
5439 * Furthermore, some downstream events have to be serialized with data flow,
5440 * like EOS, while some can travel out-of-band, like #GST_EVENT_FLUSH_START. If
5441 * the event needs to be serialized with data flow, this function will take the
5442 * pad's stream lock while calling its event function.
5444 * To find out whether an event type is upstream, downstream, or downstream and
5445 * serialized, see #GstEventTypeFlags, gst_event_type_get_flags(),
5446 * #GST_EVENT_IS_UPSTREAM, #GST_EVENT_IS_DOWNSTREAM, and
5447 * #GST_EVENT_IS_SERIALIZED. Note that in practice that an application or
5448 * plugin doesn't need to bother itself with this information; the core handles
5449 * all necessary locks and checks.
5451 * This function takes ownership of the provided event so you should
5452 * gst_event_ref() it if you want to reuse the event after this call.
5454 * Returns: %TRUE if the event was handled.
5457 gst_pad_send_event (GstPad * pad, GstEvent * event)
5460 GstPadProbeType type;
5462 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
5463 g_return_val_if_fail (event != NULL, FALSE);
5465 if (GST_PAD_IS_SINK (pad)) {
5466 if (G_UNLIKELY (!GST_EVENT_IS_DOWNSTREAM (event)))
5467 goto wrong_direction;
5468 type = GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM;
5469 } else if (GST_PAD_IS_SRC (pad)) {
5470 if (G_UNLIKELY (!GST_EVENT_IS_UPSTREAM (event)))
5471 goto wrong_direction;
5472 type = GST_PAD_PROBE_TYPE_EVENT_UPSTREAM;
5474 goto unknown_direction;
5476 if (gst_pad_send_event_unchecked (pad, event, type) != GST_FLOW_OK)
5483 /* ERROR handling */
5486 g_warning ("pad %s:%s sending %s event in wrong direction",
5487 GST_DEBUG_PAD_NAME (pad), GST_EVENT_TYPE_NAME (event));
5488 gst_event_unref (event);
5493 g_warning ("pad %s:%s has invalid direction", GST_DEBUG_PAD_NAME (pad));
5494 gst_event_unref (event);
5500 * gst_pad_set_element_private:
5501 * @pad: the #GstPad to set the private data of.
5502 * @priv: The private data to attach to the pad.
5504 * Set the given private data gpointer on the pad.
5505 * This function can only be used by the element that owns the pad.
5506 * No locking is performed in this function.
5509 gst_pad_set_element_private (GstPad * pad, gpointer priv)
5511 pad->element_private = priv;
5515 * gst_pad_get_element_private:
5516 * @pad: the #GstPad to get the private data of.
5518 * Gets the private data of a pad.
5519 * No locking is performed in this function.
5521 * Returns: (transfer none): a #gpointer to the private data.
5524 gst_pad_get_element_private (GstPad * pad)
5526 return pad->element_private;
5530 * gst_pad_get_sticky_event:
5531 * @pad: the #GstPad to get the event from.
5532 * @event_type: the #GstEventType that should be retrieved.
5533 * @idx: the index of the event
5535 * Returns a new reference of the sticky event of type @event_type
5538 * Returns: (transfer full) (nullable): a #GstEvent of type
5539 * @event_type or %NULL when no event of @event_type was on
5540 * @pad. Unref after usage.
5543 gst_pad_get_sticky_event (GstPad * pad, GstEventType event_type, guint idx)
5545 GstEvent *event = NULL;
5548 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
5549 g_return_val_if_fail ((event_type & GST_EVENT_TYPE_STICKY) != 0, NULL);
5551 GST_OBJECT_LOCK (pad);
5552 ev = find_event_by_type (pad, event_type, idx);
5553 if (ev && (event = ev->event))
5554 gst_event_ref (event);
5555 GST_OBJECT_UNLOCK (pad);
5562 GstPadStickyEventsForeachFunction func;
5567 foreach_dispatch_function (GstPad * pad, PadEvent * ev, gpointer user_data)
5569 ForeachDispatch *data = user_data;
5570 gboolean ret = TRUE;
5573 GST_OBJECT_UNLOCK (pad);
5575 ret = data->func (pad, &ev->event, data->user_data);
5577 GST_OBJECT_LOCK (pad);
5584 * gst_pad_sticky_events_foreach:
5585 * @pad: the #GstPad that should be used for iteration.
5586 * @foreach_func: (scope call): the #GstPadStickyEventsForeachFunction that
5587 * should be called for every event.
5588 * @user_data: (closure): the optional user data.
5590 * Iterates all sticky events on @pad and calls @foreach_func for every
5591 * event. If @foreach_func returns %FALSE the iteration is immediately stopped.
5594 gst_pad_sticky_events_foreach (GstPad * pad,
5595 GstPadStickyEventsForeachFunction foreach_func, gpointer user_data)
5597 ForeachDispatch data;
5599 g_return_if_fail (GST_IS_PAD (pad));
5600 g_return_if_fail (foreach_func != NULL);
5602 data.func = foreach_func;
5603 data.user_data = user_data;
5605 GST_OBJECT_LOCK (pad);
5606 events_foreach (pad, foreach_dispatch_function, &data);
5607 GST_OBJECT_UNLOCK (pad);
5611 do_stream_status (GstPad * pad, GstStreamStatusType type,
5612 GThread * thread, GstTask * task)
5616 GST_DEBUG_OBJECT (pad, "doing stream-status %d", type);
5618 if ((parent = GST_ELEMENT_CAST (gst_pad_get_parent (pad)))) {
5619 if (GST_IS_ELEMENT (parent)) {
5620 GstMessage *message;
5621 GValue value = { 0 };
5623 if (type == GST_STREAM_STATUS_TYPE_ENTER) {
5624 gchar *tname, *ename, *pname;
5626 /* create a good task name */
5627 ename = gst_element_get_name (parent);
5628 pname = gst_pad_get_name (pad);
5629 tname = g_strdup_printf ("%s:%s", ename, pname);
5633 gst_object_set_name (GST_OBJECT_CAST (task), tname);
5637 message = gst_message_new_stream_status (GST_OBJECT_CAST (pad),
5640 g_value_init (&value, GST_TYPE_TASK);
5641 g_value_set_object (&value, task);
5642 gst_message_set_stream_status_object (message, &value);
5643 g_value_unset (&value);
5645 GST_DEBUG_OBJECT (pad, "posting stream-status %d", type);
5646 gst_element_post_message (parent, message);
5648 gst_object_unref (parent);
5653 pad_enter_thread (GstTask * task, GThread * thread, gpointer user_data)
5655 do_stream_status (GST_PAD_CAST (user_data), GST_STREAM_STATUS_TYPE_ENTER,
5660 pad_leave_thread (GstTask * task, GThread * thread, gpointer user_data)
5662 do_stream_status (GST_PAD_CAST (user_data), GST_STREAM_STATUS_TYPE_LEAVE,
5667 * gst_pad_start_task:
5668 * @pad: the #GstPad to start the task of
5669 * @func: the task function to call
5670 * @user_data: user data passed to the task function
5671 * @notify: called when @user_data is no longer referenced
5673 * Starts a task that repeatedly calls @func with @user_data. This function
5674 * is mostly used in pad activation functions to start the dataflow.
5675 * The #GST_PAD_STREAM_LOCK of @pad will automatically be acquired
5676 * before @func is called.
5678 * Returns: a %TRUE if the task could be started.
5681 gst_pad_start_task (GstPad * pad, GstTaskFunction func, gpointer user_data,
5682 GDestroyNotify notify)
5687 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
5688 g_return_val_if_fail (func != NULL, FALSE);
5690 GST_DEBUG_OBJECT (pad, "start task");
5692 GST_OBJECT_LOCK (pad);
5693 task = GST_PAD_TASK (pad);
5695 task = gst_task_new (func, user_data, notify);
5696 gst_task_set_lock (task, GST_PAD_GET_STREAM_LOCK (pad));
5697 gst_task_set_enter_callback (task, pad_enter_thread, pad, NULL);
5698 gst_task_set_leave_callback (task, pad_leave_thread, pad, NULL);
5699 GST_INFO_OBJECT (pad, "created task %p", task);
5700 GST_PAD_TASK (pad) = task;
5701 gst_object_ref (task);
5702 /* release lock to post the message */
5703 GST_OBJECT_UNLOCK (pad);
5705 do_stream_status (pad, GST_STREAM_STATUS_TYPE_CREATE, NULL, task);
5707 gst_object_unref (task);
5709 GST_OBJECT_LOCK (pad);
5710 /* nobody else is supposed to have changed the pad now */
5711 if (GST_PAD_TASK (pad) != task)
5712 goto concurrent_stop;
5714 res = gst_task_set_state (task, GST_TASK_STARTED);
5715 GST_OBJECT_UNLOCK (pad);
5722 GST_OBJECT_UNLOCK (pad);
5728 * gst_pad_pause_task:
5729 * @pad: the #GstPad to pause the task of
5731 * Pause the task of @pad. This function will also wait until the
5732 * function executed by the task is finished if this function is not
5733 * called from the task function.
5735 * Returns: a %TRUE if the task could be paused or %FALSE when the pad
5739 gst_pad_pause_task (GstPad * pad)
5744 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
5746 GST_DEBUG_OBJECT (pad, "pause task");
5748 GST_OBJECT_LOCK (pad);
5749 task = GST_PAD_TASK (pad);
5752 res = gst_task_set_state (task, GST_TASK_PAUSED);
5753 GST_OBJECT_UNLOCK (pad);
5755 /* wait for task function to finish, this lock is recursive so it does nothing
5756 * when the pause is called from the task itself */
5757 GST_PAD_STREAM_LOCK (pad);
5758 GST_PAD_STREAM_UNLOCK (pad);
5764 GST_DEBUG_OBJECT (pad, "pad has no task");
5765 GST_OBJECT_UNLOCK (pad);
5771 * gst_pad_stop_task:
5772 * @pad: the #GstPad to stop the task of
5774 * Stop the task of @pad. This function will also make sure that the
5775 * function executed by the task will effectively stop if not called
5776 * from the GstTaskFunction.
5778 * This function will deadlock if called from the GstTaskFunction of
5779 * the task. Use gst_task_pause() instead.
5781 * Regardless of whether the pad has a task, the stream lock is acquired and
5782 * released so as to ensure that streaming through this pad has finished.
5784 * Returns: a %TRUE if the task could be stopped or %FALSE on error.
5787 gst_pad_stop_task (GstPad * pad)
5792 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
5794 GST_DEBUG_OBJECT (pad, "stop task");
5796 GST_OBJECT_LOCK (pad);
5797 task = GST_PAD_TASK (pad);
5800 GST_PAD_TASK (pad) = NULL;
5801 res = gst_task_set_state (task, GST_TASK_STOPPED);
5802 GST_OBJECT_UNLOCK (pad);
5804 GST_PAD_STREAM_LOCK (pad);
5805 GST_PAD_STREAM_UNLOCK (pad);
5807 if (!gst_task_join (task))
5810 gst_object_unref (task);
5816 GST_DEBUG_OBJECT (pad, "no task");
5817 GST_OBJECT_UNLOCK (pad);
5819 GST_PAD_STREAM_LOCK (pad);
5820 GST_PAD_STREAM_UNLOCK (pad);
5822 /* this is not an error */
5827 /* this is bad, possibly the application tried to join the task from
5828 * the task's thread. We install the task again so that it will be stopped
5829 * again from the right thread next time hopefully. */
5830 GST_OBJECT_LOCK (pad);
5831 GST_DEBUG_OBJECT (pad, "join failed");
5832 /* we can only install this task if there was no other task */
5833 if (GST_PAD_TASK (pad) == NULL)
5834 GST_PAD_TASK (pad) = task;
5835 GST_OBJECT_UNLOCK (pad);
5842 * gst_pad_probe_info_get_event:
5843 * @info: a #GstPadProbeInfo
5845 * Returns: (transfer none): The #GstEvent from the probe
5849 gst_pad_probe_info_get_event (GstPadProbeInfo * info)
5851 g_return_val_if_fail (info->type & (GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM |
5852 GST_PAD_PROBE_TYPE_EVENT_UPSTREAM), NULL);
5854 return GST_PAD_PROBE_INFO_EVENT (info);
5859 * gst_pad_probe_info_get_query:
5860 * @info: a #GstPadProbeInfo
5862 * Returns: (transfer none): The #GstQuery from the probe
5866 gst_pad_probe_info_get_query (GstPadProbeInfo * info)
5868 g_return_val_if_fail (info->type & (GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM |
5869 GST_PAD_PROBE_TYPE_QUERY_UPSTREAM), NULL);
5871 return GST_PAD_PROBE_INFO_QUERY (info);
5875 * gst_pad_probe_info_get_buffer:
5876 * @info: a #GstPadProbeInfo
5878 * Returns: (transfer none): The #GstBuffer from the probe
5882 gst_pad_probe_info_get_buffer (GstPadProbeInfo * info)
5884 g_return_val_if_fail (info->type & GST_PAD_PROBE_TYPE_BUFFER, NULL);
5886 return GST_PAD_PROBE_INFO_BUFFER (info);
5890 * gst_pad_probe_info_get_bufferlist:
5891 * @info: a #GstPadProbeInfo
5893 * Returns: (transfer none): The #GstBufferlist from the probe
5897 gst_pad_probe_info_get_buffer_list (GstPadProbeInfo * info)
5899 g_return_val_if_fail (info->type & GST_PAD_PROBE_TYPE_BUFFER_LIST, NULL);
5901 return GST_PAD_PROBE_INFO_BUFFER_LIST (info);
5905 * gst_pad_get_last_flow_return:
5908 * Gets the #GstFlowReturn return from the last data passed by this pad.
5913 gst_pad_get_last_flow_return (GstPad * pad)
5917 GST_OBJECT_LOCK (pad);
5918 ret = GST_PAD_LAST_FLOW_RETURN (pad);
5919 GST_OBJECT_UNLOCK (pad);