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;
144 /* counter of how many idle probes are running directly from the add_probe
145 * call. Used to block any data flowing in the pad while the idle callback
146 * Doesn't finish its work */
156 #define PROBE_COOKIE(h) (((GstProbe *)(h))->cookie)
157 #define GST_PAD_IS_RUNNING_IDLE_PROBE(p) \
158 (((GstPad *)(p))->priv->idle_running > 0)
163 GstPadProbeInfo *info;
171 static void gst_pad_dispose (GObject * object);
172 static void gst_pad_finalize (GObject * object);
173 static void gst_pad_set_property (GObject * object, guint prop_id,
174 const GValue * value, GParamSpec * pspec);
175 static void gst_pad_get_property (GObject * object, guint prop_id,
176 GValue * value, GParamSpec * pspec);
178 static void gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ);
179 static gboolean gst_pad_activate_default (GstPad * pad, GstObject * parent);
180 static GstFlowReturn gst_pad_chain_list_default (GstPad * pad,
181 GstObject * parent, GstBufferList * list);
183 static GstFlowReturn gst_pad_send_event_unchecked (GstPad * pad,
184 GstEvent * event, GstPadProbeType type);
185 static GstFlowReturn gst_pad_push_event_unchecked (GstPad * pad,
186 GstEvent * event, GstPadProbeType type);
188 static guint gst_pad_signals[LAST_SIGNAL] = { 0 };
190 static GParamSpec *pspec_caps = NULL;
192 /* quarks for probe signals */
193 static GQuark buffer_quark;
194 static GQuark buffer_list_quark;
195 static GQuark event_quark;
204 static GstFlowQuarks flow_quarks[] = {
205 {GST_FLOW_CUSTOM_SUCCESS, "custom-success", 0},
206 {GST_FLOW_OK, "ok", 0},
207 {GST_FLOW_NOT_LINKED, "not-linked", 0},
208 {GST_FLOW_FLUSHING, "flushing", 0},
209 {GST_FLOW_EOS, "eos", 0},
210 {GST_FLOW_NOT_NEGOTIATED, "not-negotiated", 0},
211 {GST_FLOW_ERROR, "error", 0},
212 {GST_FLOW_NOT_SUPPORTED, "not-supported", 0},
213 {GST_FLOW_CUSTOM_ERROR, "custom-error", 0}
218 * @ret: a #GstFlowReturn to get the name of.
220 * Gets a string representing the given flow return.
222 * Returns: a static string with the name of the flow return.
225 gst_flow_get_name (GstFlowReturn ret)
229 ret = CLAMP (ret, GST_FLOW_CUSTOM_ERROR, GST_FLOW_CUSTOM_SUCCESS);
231 for (i = 0; i < G_N_ELEMENTS (flow_quarks); i++) {
232 if (ret == flow_quarks[i].ret)
233 return flow_quarks[i].name;
240 * @ret: a #GstFlowReturn to get the quark of.
242 * Get the unique quark for the given GstFlowReturn.
244 * Returns: the quark associated with the flow return or 0 if an
245 * invalid return was specified.
248 gst_flow_to_quark (GstFlowReturn ret)
252 ret = CLAMP (ret, GST_FLOW_CUSTOM_ERROR, GST_FLOW_CUSTOM_SUCCESS);
254 for (i = 0; i < G_N_ELEMENTS (flow_quarks); i++) {
255 if (ret == flow_quarks[i].ret)
256 return flow_quarks[i].quark;
262 * gst_pad_link_get_name:
263 * @ret: a #GstPadLinkReturn to get the name of.
265 * Gets a string representing the given pad-link return.
267 * Returns: a static string with the name of the pad-link return.
272 gst_pad_link_get_name (GstPadLinkReturn ret)
275 case GST_PAD_LINK_OK:
277 case GST_PAD_LINK_WRONG_HIERARCHY:
278 return "wrong hierarchy";
279 case GST_PAD_LINK_WAS_LINKED:
281 case GST_PAD_LINK_WRONG_DIRECTION:
282 return "wrong direction";
283 case GST_PAD_LINK_NOFORMAT:
284 return "no common format";
285 case GST_PAD_LINK_NOSCHED:
286 return "incompatible scheduling";
287 case GST_PAD_LINK_REFUSED:
290 g_return_val_if_reached ("unknown");
297 buffer_quark = g_quark_from_static_string ("buffer"); \
298 buffer_list_quark = g_quark_from_static_string ("bufferlist"); \
299 event_quark = g_quark_from_static_string ("event"); \
301 for (i = 0; i < G_N_ELEMENTS (flow_quarks); i++) { \
302 flow_quarks[i].quark = g_quark_from_static_string (flow_quarks[i].name); \
305 GST_DEBUG_CATEGORY_INIT (debug_dataflow, "GST_DATAFLOW", \
306 GST_DEBUG_BOLD | GST_DEBUG_FG_GREEN, "dataflow inside pads"); \
309 #define gst_pad_parent_class parent_class
310 G_DEFINE_TYPE_WITH_CODE (GstPad, gst_pad, GST_TYPE_OBJECT, _do_init);
313 gst_pad_class_init (GstPadClass * klass)
315 GObjectClass *gobject_class;
316 GstObjectClass *gstobject_class;
318 gobject_class = G_OBJECT_CLASS (klass);
319 gstobject_class = GST_OBJECT_CLASS (klass);
321 g_type_class_add_private (klass, sizeof (GstPadPrivate));
323 gobject_class->dispose = gst_pad_dispose;
324 gobject_class->finalize = gst_pad_finalize;
325 gobject_class->set_property = gst_pad_set_property;
326 gobject_class->get_property = gst_pad_get_property;
330 * @pad: the pad that emitted the signal
331 * @peer: the peer pad that has been connected
333 * Signals that a pad has been linked to the peer pad.
335 gst_pad_signals[PAD_LINKED] =
336 g_signal_new ("linked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
337 G_STRUCT_OFFSET (GstPadClass, linked), NULL, NULL,
338 g_cclosure_marshal_generic, G_TYPE_NONE, 1, GST_TYPE_PAD);
341 * @pad: the pad that emitted the signal
342 * @peer: the peer pad that has been disconnected
344 * Signals that a pad has been unlinked from the peer pad.
346 gst_pad_signals[PAD_UNLINKED] =
347 g_signal_new ("unlinked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
348 G_STRUCT_OFFSET (GstPadClass, unlinked), NULL, NULL,
349 g_cclosure_marshal_generic, G_TYPE_NONE, 1, GST_TYPE_PAD);
351 pspec_caps = g_param_spec_boxed ("caps", "Caps",
352 "The capabilities of the pad", GST_TYPE_CAPS,
353 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
354 g_object_class_install_property (gobject_class, PAD_PROP_CAPS, pspec_caps);
356 g_object_class_install_property (gobject_class, PAD_PROP_DIRECTION,
357 g_param_spec_enum ("direction", "Direction", "The direction of the pad",
358 GST_TYPE_PAD_DIRECTION, GST_PAD_UNKNOWN,
359 G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
361 /* FIXME, Make G_PARAM_CONSTRUCT_ONLY when we fix ghostpads. */
362 g_object_class_install_property (gobject_class, PAD_PROP_TEMPLATE,
363 g_param_spec_object ("template", "Template",
364 "The GstPadTemplate of this pad", GST_TYPE_PAD_TEMPLATE,
365 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
370 * The offset that will be applied to the running time of the pad.
374 g_object_class_install_property (gobject_class, PAD_PROP_OFFSET,
375 g_param_spec_int64 ("offset", "Offset",
376 "The running time offset of the pad", 0, G_MAXINT64, 0,
377 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
379 gstobject_class->path_string_separator = ".";
381 /* Register common function pointer descriptions */
382 GST_DEBUG_REGISTER_FUNCPTR (gst_pad_activate_default);
383 GST_DEBUG_REGISTER_FUNCPTR (gst_pad_event_default);
384 GST_DEBUG_REGISTER_FUNCPTR (gst_pad_query_default);
385 GST_DEBUG_REGISTER_FUNCPTR (gst_pad_iterate_internal_links_default);
386 GST_DEBUG_REGISTER_FUNCPTR (gst_pad_chain_list_default);
390 gst_pad_init (GstPad * pad)
392 pad->priv = GST_PAD_GET_PRIVATE (pad);
394 GST_PAD_DIRECTION (pad) = GST_PAD_UNKNOWN;
396 GST_PAD_ACTIVATEFUNC (pad) = gst_pad_activate_default;
397 GST_PAD_EVENTFUNC (pad) = gst_pad_event_default;
398 GST_PAD_QUERYFUNC (pad) = gst_pad_query_default;
399 GST_PAD_ITERINTLINKFUNC (pad) = gst_pad_iterate_internal_links_default;
400 GST_PAD_CHAINLISTFUNC (pad) = gst_pad_chain_list_default;
402 GST_PAD_SET_FLUSHING (pad);
404 g_rec_mutex_init (&pad->stream_rec_lock);
406 g_cond_init (&pad->block_cond);
408 g_hook_list_init (&pad->probes, sizeof (GstProbe));
410 pad->priv->events = g_array_sized_new (FALSE, TRUE, sizeof (PadEvent), 16);
411 pad->priv->events_cookie = 0;
412 pad->priv->last_cookie = -1;
413 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
416 /* called when setting the pad inactive. It removes all sticky events from
417 * the pad. must be called with object lock */
419 remove_events (GstPad * pad)
423 gboolean notify = FALSE;
425 events = pad->priv->events;
428 for (i = 0; i < len; i++) {
429 PadEvent *ev = &g_array_index (events, PadEvent, i);
430 GstEvent *event = ev->event;
434 if (event && GST_EVENT_TYPE (event) == GST_EVENT_CAPS)
437 gst_event_unref (event);
440 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PENDING_EVENTS);
441 g_array_set_size (events, 0);
442 pad->priv->events_cookie++;
445 GST_OBJECT_UNLOCK (pad);
447 GST_DEBUG_OBJECT (pad, "notify caps");
448 g_object_notify_by_pspec ((GObject *) pad, pspec_caps);
450 GST_OBJECT_LOCK (pad);
454 /* should be called with object lock */
456 find_event_by_type (GstPad * pad, GstEventType type, guint idx)
462 events = pad->priv->events;
465 for (i = 0; i < len; i++) {
466 ev = &g_array_index (events, PadEvent, i);
467 if (ev->event == NULL)
470 if (GST_EVENT_TYPE (ev->event) == type) {
474 } else if (GST_EVENT_TYPE (ev->event) > type) {
483 /* should be called with OBJECT lock */
485 find_event (GstPad * pad, GstEvent * event)
491 events = pad->priv->events;
494 for (i = 0; i < len; i++) {
495 ev = &g_array_index (events, PadEvent, i);
496 if (event == ev->event)
498 else if (GST_EVENT_TYPE (ev->event) > GST_EVENT_TYPE (event))
506 /* should be called with OBJECT lock */
508 remove_event_by_type (GstPad * pad, GstEventType type)
514 events = pad->priv->events;
519 ev = &g_array_index (events, PadEvent, i);
520 if (ev->event == NULL)
523 if (GST_EVENT_TYPE (ev->event) > type)
525 else if (GST_EVENT_TYPE (ev->event) != type)
528 gst_event_unref (ev->event);
529 g_array_remove_index (events, i);
531 pad->priv->events_cookie++;
539 /* check all events on srcpad against those on sinkpad. All events that are not
540 * on sinkpad are marked as received=%FALSE and the PENDING_EVENTS is set on the
541 * srcpad so that the events will be sent next time */
542 /* should be called with srcpad and sinkpad LOCKS */
544 schedule_events (GstPad * srcpad, GstPad * sinkpad)
549 gboolean pending = FALSE;
551 events = srcpad->priv->events;
554 for (i = 0; i < len; i++) {
555 ev = &g_array_index (events, PadEvent, i);
556 if (ev->event == NULL)
559 if (sinkpad == NULL || !find_event (sinkpad, ev->event)) {
560 ev->received = FALSE;
565 GST_OBJECT_FLAG_SET (srcpad, GST_PAD_FLAG_PENDING_EVENTS);
568 typedef gboolean (*PadEventFunction) (GstPad * pad, PadEvent * ev,
571 /* should be called with pad LOCK */
573 events_foreach (GstPad * pad, PadEventFunction func, gpointer user_data)
580 events = pad->priv->events;
583 cookie = pad->priv->events_cookie;
587 PadEvent *ev, ev_ret;
589 ev = &g_array_index (events, PadEvent, i);
590 if (G_UNLIKELY (ev->event == NULL))
593 /* take aditional ref, func might release the lock */
594 ev_ret.event = gst_event_ref (ev->event);
595 ev_ret.received = ev->received;
597 ret = func (pad, &ev_ret, user_data);
599 /* recheck the cookie, lock might have been released and the list could have
601 if (G_UNLIKELY (cookie != pad->priv->events_cookie)) {
602 if (G_LIKELY (ev_ret.event))
603 gst_event_unref (ev_ret.event);
607 /* store the received state */
608 ev->received = ev_ret.received;
610 /* if the event changed, we need to do something */
611 if (G_UNLIKELY (ev->event != ev_ret.event)) {
612 if (G_UNLIKELY (ev_ret.event == NULL)) {
613 /* function unreffed and set the event to NULL, remove it */
614 gst_event_unref (ev->event);
615 g_array_remove_index (events, i);
617 cookie = ++pad->priv->events_cookie;
620 /* function gave a new event for us */
621 gst_event_take (&ev->event, ev_ret.event);
624 /* just unref, nothing changed */
625 gst_event_unref (ev_ret.event);
634 /* should be called with LOCK */
636 _apply_pad_offset (GstPad * pad, GstEvent * event, gboolean upstream)
640 GST_DEBUG_OBJECT (pad, "apply pad offset %" GST_TIME_FORMAT,
641 GST_TIME_ARGS (pad->offset));
643 if (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
646 g_assert (!upstream);
648 /* copy segment values */
649 gst_event_copy_segment (event, &segment);
650 gst_event_unref (event);
652 gst_segment_offset_running_time (&segment, segment.format, pad->offset);
653 event = gst_event_new_segment (&segment);
656 event = gst_event_make_writable (event);
657 offset = gst_event_get_running_time_offset (event);
659 offset -= pad->offset;
661 offset += pad->offset;
662 gst_event_set_running_time_offset (event, offset);
667 static inline GstEvent *
668 apply_pad_offset (GstPad * pad, GstEvent * event, gboolean upstream)
670 if (G_UNLIKELY (pad->offset != 0))
671 return _apply_pad_offset (pad, event, upstream);
676 /* should be called with the OBJECT_LOCK */
678 get_pad_caps (GstPad * pad)
680 GstCaps *caps = NULL;
683 ev = find_event_by_type (pad, GST_EVENT_CAPS, 0);
685 gst_event_parse_caps (ev->event, &caps);
691 gst_pad_dispose (GObject * object)
693 GstPad *pad = GST_PAD_CAST (object);
696 GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pad, "dispose");
698 /* unlink the peer pad */
699 if ((peer = gst_pad_get_peer (pad))) {
700 /* window for MT unsafeness, someone else could unlink here
701 * and then we call unlink with wrong pads. The unlink
702 * function would catch this and safely return failed. */
703 if (GST_PAD_IS_SRC (pad))
704 gst_pad_unlink (pad, peer);
706 gst_pad_unlink (peer, pad);
708 gst_object_unref (peer);
711 gst_pad_set_pad_template (pad, NULL);
713 GST_OBJECT_LOCK (pad);
715 GST_OBJECT_UNLOCK (pad);
717 g_hook_list_clear (&pad->probes);
719 G_OBJECT_CLASS (parent_class)->dispose (object);
723 gst_pad_finalize (GObject * object)
725 GstPad *pad = GST_PAD_CAST (object);
728 /* in case the task is still around, clean it up */
729 if ((task = GST_PAD_TASK (pad))) {
730 gst_task_join (task);
731 GST_PAD_TASK (pad) = NULL;
732 gst_object_unref (task);
735 if (pad->activatenotify)
736 pad->activatenotify (pad->activatedata);
737 if (pad->activatemodenotify)
738 pad->activatemodenotify (pad->activatemodedata);
740 pad->linknotify (pad->linkdata);
741 if (pad->unlinknotify)
742 pad->unlinknotify (pad->unlinkdata);
743 if (pad->chainnotify)
744 pad->chainnotify (pad->chaindata);
745 if (pad->chainlistnotify)
746 pad->chainlistnotify (pad->chainlistdata);
747 if (pad->getrangenotify)
748 pad->getrangenotify (pad->getrangedata);
749 if (pad->eventnotify)
750 pad->eventnotify (pad->eventdata);
751 if (pad->querynotify)
752 pad->querynotify (pad->querydata);
753 if (pad->iterintlinknotify)
754 pad->iterintlinknotify (pad->iterintlinkdata);
756 g_rec_mutex_clear (&pad->stream_rec_lock);
757 g_cond_clear (&pad->block_cond);
758 g_array_free (pad->priv->events, TRUE);
760 G_OBJECT_CLASS (parent_class)->finalize (object);
764 gst_pad_set_property (GObject * object, guint prop_id,
765 const GValue * value, GParamSpec * pspec)
767 g_return_if_fail (GST_IS_PAD (object));
770 case PAD_PROP_DIRECTION:
771 GST_PAD_DIRECTION (object) = (GstPadDirection) g_value_get_enum (value);
773 case PAD_PROP_TEMPLATE:
774 gst_pad_set_pad_template (GST_PAD_CAST (object),
775 (GstPadTemplate *) g_value_get_object (value));
777 case PAD_PROP_OFFSET:
778 gst_pad_set_offset (GST_PAD_CAST (object), g_value_get_int64 (value));
781 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
787 gst_pad_get_property (GObject * object, guint prop_id,
788 GValue * value, GParamSpec * pspec)
790 g_return_if_fail (GST_IS_PAD (object));
794 GST_OBJECT_LOCK (object);
795 g_value_set_boxed (value, get_pad_caps (GST_PAD_CAST (object)));
796 GST_OBJECT_UNLOCK (object);
798 case PAD_PROP_DIRECTION:
799 g_value_set_enum (value, GST_PAD_DIRECTION (object));
801 case PAD_PROP_TEMPLATE:
802 g_value_set_object (value, GST_PAD_PAD_TEMPLATE (object));
804 case PAD_PROP_OFFSET:
805 g_value_set_int64 (value, gst_pad_get_offset (GST_PAD_CAST (object)));
808 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
815 * @name: (allow-none): the name of the new pad.
816 * @direction: the #GstPadDirection of the pad.
818 * Creates a new pad with the given name in the given direction.
819 * If name is %NULL, a guaranteed unique name (across all pads)
821 * This function makes a copy of the name so you can safely free the name.
823 * Returns: (transfer floating) (nullable): a new #GstPad, or %NULL in
829 gst_pad_new (const gchar * name, GstPadDirection direction)
831 return g_object_new (GST_TYPE_PAD,
832 "name", name, "direction", direction, NULL);
836 * gst_pad_new_from_template:
837 * @templ: the pad template to use
838 * @name: (allow-none): the name of the pad
840 * Creates a new pad with the given name from the given template.
841 * If name is %NULL, a guaranteed unique name (across all pads)
843 * This function makes a copy of the name so you can safely free the name.
845 * Returns: (transfer floating) (nullable): a new #GstPad, or %NULL in
849 gst_pad_new_from_template (GstPadTemplate * templ, const gchar * name)
851 g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL);
853 return g_object_new (GST_TYPE_PAD,
854 "name", name, "direction", templ->direction, "template", templ, NULL);
858 * gst_pad_new_from_static_template:
859 * @templ: the #GstStaticPadTemplate to use
860 * @name: the name of the pad
862 * Creates a new pad with the given name from the given static template.
863 * If name is %NULL, a guaranteed unique name (across all pads)
865 * This function makes a copy of the name so you can safely free the name.
867 * Returns: (transfer floating) (nullable): a new #GstPad, or %NULL in
871 gst_pad_new_from_static_template (GstStaticPadTemplate * templ,
875 GstPadTemplate *template;
877 template = gst_static_pad_template_get (templ);
878 pad = gst_pad_new_from_template (template, name);
879 gst_object_unref (template);
883 #define ACQUIRE_PARENT(pad, parent, label) \
885 if (G_LIKELY ((parent = GST_OBJECT_PARENT (pad)))) \
886 gst_object_ref (parent); \
887 else if (G_LIKELY (GST_PAD_NEEDS_PARENT (pad))) \
891 #define RELEASE_PARENT(parent) \
893 if (G_LIKELY (parent)) \
894 gst_object_unref (parent); \
898 * gst_pad_get_direction:
899 * @pad: a #GstPad to get the direction of.
901 * Gets the direction of the pad. The direction of the pad is
902 * decided at construction time so this function does not take
905 * Returns: the #GstPadDirection of the pad.
910 gst_pad_get_direction (GstPad * pad)
912 GstPadDirection result;
914 /* PAD_UNKNOWN is a little silly but we need some sort of
915 * error return value */
916 g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_UNKNOWN);
918 result = GST_PAD_DIRECTION (pad);
924 gst_pad_activate_default (GstPad * pad, GstObject * parent)
926 return gst_pad_activate_mode (pad, GST_PAD_MODE_PUSH, TRUE);
930 * gst_pad_mode_get_name:
931 * @mode: the pad mode
933 * Return the name of a pad mode, for use in debug messages mostly.
935 * Returns: short mnemonic for pad mode @mode
938 gst_pad_mode_get_name (GstPadMode mode)
941 case GST_PAD_MODE_NONE:
943 case GST_PAD_MODE_PUSH:
945 case GST_PAD_MODE_PULL:
954 pre_activate (GstPad * pad, GstPadMode new_mode)
957 case GST_PAD_MODE_NONE:
958 GST_OBJECT_LOCK (pad);
959 GST_DEBUG_OBJECT (pad, "setting PAD_MODE NONE, set flushing");
960 GST_PAD_SET_FLUSHING (pad);
961 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
962 GST_PAD_MODE (pad) = new_mode;
963 /* unlock blocked pads so element can resume and stop */
964 GST_PAD_BLOCK_BROADCAST (pad);
965 GST_OBJECT_UNLOCK (pad);
967 case GST_PAD_MODE_PUSH:
968 case GST_PAD_MODE_PULL:
969 GST_OBJECT_LOCK (pad);
970 GST_DEBUG_OBJECT (pad, "setting pad into %s mode, unset flushing",
971 gst_pad_mode_get_name (new_mode));
972 GST_PAD_UNSET_FLUSHING (pad);
973 pad->ABI.abi.last_flowret = GST_FLOW_OK;
974 GST_PAD_MODE (pad) = new_mode;
975 if (GST_PAD_IS_SINK (pad)) {
977 /* make sure the peer src pad sends us all events */
978 if ((peer = GST_PAD_PEER (pad))) {
979 gst_object_ref (peer);
980 GST_OBJECT_UNLOCK (pad);
982 GST_DEBUG_OBJECT (pad, "reschedule events on peer %s:%s",
983 GST_DEBUG_PAD_NAME (peer));
985 GST_OBJECT_LOCK (peer);
986 schedule_events (peer, NULL);
987 GST_OBJECT_UNLOCK (peer);
989 gst_object_unref (peer);
991 GST_OBJECT_UNLOCK (pad);
994 GST_OBJECT_UNLOCK (pad);
1001 post_activate (GstPad * pad, GstPadMode new_mode)
1004 case GST_PAD_MODE_NONE:
1005 /* ensures that streaming stops */
1006 GST_PAD_STREAM_LOCK (pad);
1007 GST_DEBUG_OBJECT (pad, "stopped streaming");
1008 GST_OBJECT_LOCK (pad);
1009 remove_events (pad);
1010 GST_OBJECT_UNLOCK (pad);
1011 GST_PAD_STREAM_UNLOCK (pad);
1013 case GST_PAD_MODE_PUSH:
1014 case GST_PAD_MODE_PULL:
1021 * gst_pad_set_active:
1022 * @pad: the #GstPad to activate or deactivate.
1023 * @active: whether or not the pad should be active.
1025 * Activates or deactivates the given pad.
1026 * Normally called from within core state change functions.
1028 * If @active, makes sure the pad is active. If it is already active, either in
1029 * push or pull mode, just return. Otherwise dispatches to the pad's activate
1030 * function to perform the actual activation.
1032 * If not @active, calls gst_pad_activate_mode() with the pad's current mode
1033 * and a %FALSE argument.
1035 * Returns: %TRUE if the operation was successful.
1040 gst_pad_set_active (GstPad * pad, gboolean active)
1044 gboolean ret = FALSE;
1046 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1048 GST_OBJECT_LOCK (pad);
1049 old = GST_PAD_MODE (pad);
1050 ACQUIRE_PARENT (pad, parent, no_parent);
1051 GST_OBJECT_UNLOCK (pad);
1054 if (old == GST_PAD_MODE_NONE) {
1055 GST_DEBUG_OBJECT (pad, "activating pad from none");
1056 ret = (GST_PAD_ACTIVATEFUNC (pad)) (pad, parent);
1058 pad->ABI.abi.last_flowret = GST_FLOW_OK;
1060 GST_DEBUG_OBJECT (pad, "pad was active in %s mode",
1061 gst_pad_mode_get_name (old));
1065 if (old == GST_PAD_MODE_NONE) {
1066 GST_DEBUG_OBJECT (pad, "pad was inactive");
1069 GST_DEBUG_OBJECT (pad, "deactivating pad from %s mode",
1070 gst_pad_mode_get_name (old));
1071 ret = gst_pad_activate_mode (pad, old, FALSE);
1073 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
1077 RELEASE_PARENT (parent);
1079 if (G_UNLIKELY (!ret))
1087 GST_DEBUG_OBJECT (pad, "no parent");
1088 GST_OBJECT_UNLOCK (pad);
1093 GST_OBJECT_LOCK (pad);
1095 g_critical ("Failed to deactivate pad %s:%s, very bad",
1096 GST_DEBUG_PAD_NAME (pad));
1098 GST_WARNING_OBJECT (pad, "Failed to activate pad");
1100 GST_OBJECT_UNLOCK (pad);
1106 * gst_pad_activate_mode:
1107 * @pad: the #GstPad to activate or deactivate.
1108 * @mode: the requested activation mode
1109 * @active: whether or not the pad should be active.
1111 * Activates or deactivates the given pad in @mode via dispatching to the
1112 * pad's activatemodefunc. For use from within pad activation functions only.
1114 * If you don't know what this is, you probably don't want to call it.
1116 * Returns: %TRUE if the operation was successful.
1121 gst_pad_activate_mode (GstPad * pad, GstPadMode mode, gboolean active)
1123 gboolean res = FALSE;
1125 GstPadMode old, new;
1126 GstPadDirection dir;
1129 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1131 GST_OBJECT_LOCK (pad);
1132 old = GST_PAD_MODE (pad);
1133 dir = GST_PAD_DIRECTION (pad);
1134 ACQUIRE_PARENT (pad, parent, no_parent);
1135 GST_OBJECT_UNLOCK (pad);
1137 new = active ? mode : GST_PAD_MODE_NONE;
1142 if (active && old != mode && old != GST_PAD_MODE_NONE) {
1143 /* pad was activate in the wrong direction, deactivate it
1144 * and reactivate it in the requested mode */
1145 GST_DEBUG_OBJECT (pad, "deactivating pad from %s mode",
1146 gst_pad_mode_get_name (old));
1148 if (G_UNLIKELY (!gst_pad_activate_mode (pad, old, FALSE)))
1149 goto deactivate_failed;
1153 case GST_PAD_MODE_PULL:
1155 if (dir == GST_PAD_SINK) {
1156 if ((peer = gst_pad_get_peer (pad))) {
1157 GST_DEBUG_OBJECT (pad, "calling peer");
1158 if (G_UNLIKELY (!gst_pad_activate_mode (peer, mode, active)))
1160 gst_object_unref (peer);
1162 /* there is no peer, this is only fatal when we activate. When we
1163 * deactivate, we must assume the application has unlinked the peer and
1164 * will deactivate it eventually. */
1168 GST_DEBUG_OBJECT (pad, "deactivating unlinked pad");
1171 if (G_UNLIKELY (GST_PAD_GETRANGEFUNC (pad) == NULL))
1172 goto failure; /* Can't activate pull on a src without a
1173 getrange function */
1181 /* Mark pad as needing reconfiguration */
1183 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
1184 pre_activate (pad, new);
1186 if (GST_PAD_ACTIVATEMODEFUNC (pad)) {
1187 if (G_UNLIKELY (!GST_PAD_ACTIVATEMODEFUNC (pad) (pad, parent, mode,
1191 /* can happen for sinks of passthrough elements */
1194 post_activate (pad, new);
1196 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "%s in %s mode",
1197 active ? "activated" : "deactivated", gst_pad_mode_get_name (mode));
1202 /* Clear sticky flags on deactivation */
1204 GST_OBJECT_LOCK (pad);
1205 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
1206 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_EOS);
1207 GST_OBJECT_UNLOCK (pad);
1211 RELEASE_PARENT (parent);
1217 GST_DEBUG_OBJECT (pad, "no parent");
1218 GST_OBJECT_UNLOCK (pad);
1223 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "already %s in %s mode",
1224 active ? "activated" : "deactivated", gst_pad_mode_get_name (mode));
1229 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad,
1230 "failed to %s in switch to %s mode from %s mode",
1231 (active ? "activate" : "deactivate"), gst_pad_mode_get_name (mode),
1232 gst_pad_mode_get_name (old));
1237 GST_OBJECT_LOCK (peer);
1238 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad,
1239 "activate_mode on peer (%s:%s) failed", GST_DEBUG_PAD_NAME (peer));
1240 GST_OBJECT_UNLOCK (peer);
1241 gst_object_unref (peer);
1246 GST_CAT_INFO_OBJECT (GST_CAT_PADS, pad, "can't activate unlinked sink "
1247 "pad in pull mode");
1252 GST_OBJECT_LOCK (pad);
1253 GST_CAT_INFO_OBJECT (GST_CAT_PADS, pad, "failed to %s in %s mode",
1254 active ? "activate" : "deactivate", gst_pad_mode_get_name (mode));
1255 GST_PAD_SET_FLUSHING (pad);
1256 GST_PAD_MODE (pad) = old;
1257 GST_OBJECT_UNLOCK (pad);
1263 * gst_pad_is_active:
1264 * @pad: the #GstPad to query
1266 * Query if a pad is active
1268 * Returns: %TRUE if the pad is active.
1273 gst_pad_is_active (GstPad * pad)
1275 gboolean result = FALSE;
1277 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1279 GST_OBJECT_LOCK (pad);
1280 result = GST_PAD_IS_ACTIVE (pad);
1281 GST_OBJECT_UNLOCK (pad);
1287 cleanup_hook (GstPad * pad, GHook * hook)
1289 GstPadProbeType type;
1291 if (!G_HOOK_IS_VALID (hook))
1294 type = (hook->flags) >> G_HOOK_FLAG_USER_SHIFT;
1296 if (type & GST_PAD_PROBE_TYPE_BLOCKING) {
1297 /* unblock when we remove the last blocking probe */
1299 GST_DEBUG_OBJECT (pad, "remove blocking probe, now %d left",
1302 /* Might have new probes now that want to be called */
1303 GST_PAD_BLOCK_BROADCAST (pad);
1305 if (pad->num_blocked == 0) {
1306 GST_DEBUG_OBJECT (pad, "last blocking probe removed, unblocking");
1307 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_BLOCKED);
1310 g_hook_destroy_link (&pad->probes, hook);
1315 * gst_pad_add_probe:
1316 * @pad: the #GstPad to add the probe to
1317 * @mask: the probe mask
1318 * @callback: #GstPadProbeCallback that will be called with notifications of
1320 * @user_data: (closure): user data passed to the callback
1321 * @destroy_data: #GDestroyNotify for user_data
1323 * Be notified of different states of pads. The provided callback is called for
1324 * every state that matches @mask.
1326 * Returns: an id or 0 if no probe is pending. The id can be used to remove the
1327 * probe with gst_pad_remove_probe(). When using GST_PAD_PROBE_TYPE_IDLE it can
1328 * happen that the probe can be run immediately and if the probe returns
1329 * GST_PAD_PROBE_REMOVE this functions returns 0.
1334 gst_pad_add_probe (GstPad * pad, GstPadProbeType mask,
1335 GstPadProbeCallback callback, gpointer user_data,
1336 GDestroyNotify destroy_data)
1341 g_return_val_if_fail (GST_IS_PAD (pad), 0);
1342 g_return_val_if_fail (mask != 0, 0);
1344 GST_OBJECT_LOCK (pad);
1346 /* make a new probe */
1347 hook = g_hook_alloc (&pad->probes);
1349 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "adding probe for mask 0x%08x",
1352 /* when no contraints are given for the types, assume all types are
1354 if ((mask & GST_PAD_PROBE_TYPE_ALL_BOTH) == 0)
1355 mask |= GST_PAD_PROBE_TYPE_ALL_BOTH;
1356 if ((mask & GST_PAD_PROBE_TYPE_SCHEDULING) == 0)
1357 mask |= GST_PAD_PROBE_TYPE_SCHEDULING;
1359 /* store our flags and other fields */
1360 hook->flags |= (mask << G_HOOK_FLAG_USER_SHIFT);
1361 hook->func = callback;
1362 hook->data = user_data;
1363 hook->destroy = destroy_data;
1364 PROBE_COOKIE (hook) = (pad->priv->probe_cookie - 1);
1367 g_hook_prepend (&pad->probes, hook);
1369 /* incremenent cookie so that the new hook get's called */
1370 pad->priv->probe_list_cookie++;
1372 /* get the id of the hook, we return this and it can be used to remove the
1374 res = hook->hook_id;
1376 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "got probe id %lu", res);
1378 if (mask & GST_PAD_PROBE_TYPE_BLOCKING) {
1379 /* we have a block probe */
1381 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_BLOCKED);
1382 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "added blocking probe, "
1383 "now %d blocking probes", pad->num_blocked);
1385 /* Might have new probes now that want to be called */
1386 GST_PAD_BLOCK_BROADCAST (pad);
1389 /* call the callback if we need to be called for idle callbacks */
1390 if ((mask & GST_PAD_PROBE_TYPE_IDLE) && (callback != NULL)) {
1391 if (pad->priv->using > 0) {
1392 /* the pad is in use, we can't signal the idle callback yet. Since we set the
1393 * flag above, the last thread to leave the push will do the callback. New
1394 * threads going into the push will block. */
1395 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
1396 "pad is in use, delay idle callback");
1397 GST_OBJECT_UNLOCK (pad);
1399 GstPadProbeInfo info = { GST_PAD_PROBE_TYPE_IDLE, res, };
1400 GstPadProbeReturn ret;
1402 /* Keep another ref, the callback could destroy the pad */
1403 gst_object_ref (pad);
1404 pad->priv->idle_running++;
1406 /* the pad is idle now, we can signal the idle callback now */
1407 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
1408 "pad is idle, trigger idle callback");
1409 GST_OBJECT_UNLOCK (pad);
1411 ret = callback (pad, &info, user_data);
1413 GST_OBJECT_LOCK (pad);
1415 case GST_PAD_PROBE_REMOVE:
1416 /* remove the probe */
1417 GST_DEBUG_OBJECT (pad, "asked to remove hook");
1418 cleanup_hook (pad, hook);
1421 case GST_PAD_PROBE_DROP:
1422 GST_DEBUG_OBJECT (pad, "asked to drop item");
1424 case GST_PAD_PROBE_PASS:
1425 GST_DEBUG_OBJECT (pad, "asked to pass item");
1427 case GST_PAD_PROBE_OK:
1428 GST_DEBUG_OBJECT (pad, "probe returned OK");
1430 case GST_PAD_PROBE_HANDLED:
1431 GST_DEBUG_OBJECT (pad, "probe handled the data");
1434 GST_DEBUG_OBJECT (pad, "probe returned %d", ret);
1437 pad->priv->idle_running--;
1438 if (pad->priv->idle_running == 0) {
1439 GST_PAD_BLOCK_BROADCAST (pad);
1441 GST_OBJECT_UNLOCK (pad);
1443 gst_object_unref (pad);
1446 GST_OBJECT_UNLOCK (pad);
1452 * gst_pad_remove_probe:
1453 * @pad: the #GstPad with the probe
1454 * @id: the probe id to remove
1456 * Remove the probe with @id from @pad.
1461 gst_pad_remove_probe (GstPad * pad, gulong id)
1465 g_return_if_fail (GST_IS_PAD (pad));
1467 GST_OBJECT_LOCK (pad);
1469 hook = g_hook_get (&pad->probes, id);
1473 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "removing hook %ld",
1475 cleanup_hook (pad, hook);
1476 GST_OBJECT_UNLOCK (pad);
1482 GST_OBJECT_UNLOCK (pad);
1483 g_warning ("%s: pad `%p' has no probe with id `%lu'", G_STRLOC, pad, id);
1489 * gst_pad_is_blocked:
1490 * @pad: the #GstPad to query
1492 * Checks if the pad is blocked or not. This function returns the
1493 * last requested state of the pad. It is not certain that the pad
1494 * is actually blocking at this point (see gst_pad_is_blocking()).
1496 * Returns: %TRUE if the pad is blocked.
1501 gst_pad_is_blocked (GstPad * pad)
1503 gboolean result = FALSE;
1505 g_return_val_if_fail (GST_IS_PAD (pad), result);
1507 GST_OBJECT_LOCK (pad);
1508 result = GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_BLOCKED);
1509 GST_OBJECT_UNLOCK (pad);
1515 * gst_pad_is_blocking:
1516 * @pad: the #GstPad to query
1518 * Checks if the pad is blocking or not. This is a guaranteed state
1519 * of whether the pad is actually blocking on a #GstBuffer or a #GstEvent.
1521 * Returns: %TRUE if the pad is blocking.
1526 gst_pad_is_blocking (GstPad * pad)
1528 gboolean result = FALSE;
1530 g_return_val_if_fail (GST_IS_PAD (pad), result);
1532 GST_OBJECT_LOCK (pad);
1533 /* the blocking flag is only valid if the pad is not flushing */
1534 result = GST_PAD_IS_BLOCKING (pad) && !GST_PAD_IS_FLUSHING (pad);
1535 GST_OBJECT_UNLOCK (pad);
1541 * gst_pad_needs_reconfigure:
1542 * @pad: the #GstPad to check
1544 * Check the #GST_PAD_FLAG_NEED_RECONFIGURE flag on @pad and return %TRUE
1545 * if the flag was set.
1547 * Returns: %TRUE is the GST_PAD_FLAG_NEED_RECONFIGURE flag is set on @pad.
1550 gst_pad_needs_reconfigure (GstPad * pad)
1552 gboolean reconfigure;
1554 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1556 GST_OBJECT_LOCK (pad);
1557 reconfigure = GST_PAD_NEEDS_RECONFIGURE (pad);
1558 GST_DEBUG_OBJECT (pad, "peeking RECONFIGURE flag %d", reconfigure);
1559 GST_OBJECT_UNLOCK (pad);
1565 * gst_pad_check_reconfigure:
1566 * @pad: the #GstPad to check
1568 * Check and clear the #GST_PAD_FLAG_NEED_RECONFIGURE flag on @pad and return %TRUE
1569 * if the flag was set.
1571 * Returns: %TRUE is the GST_PAD_FLAG_NEED_RECONFIGURE flag was set on @pad.
1574 gst_pad_check_reconfigure (GstPad * pad)
1576 gboolean reconfigure;
1578 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1580 GST_OBJECT_LOCK (pad);
1581 reconfigure = GST_PAD_NEEDS_RECONFIGURE (pad);
1583 GST_DEBUG_OBJECT (pad, "remove RECONFIGURE flag");
1584 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
1586 GST_OBJECT_UNLOCK (pad);
1592 * gst_pad_mark_reconfigure:
1593 * @pad: the #GstPad to mark
1595 * Mark a pad for needing reconfiguration. The next call to
1596 * gst_pad_check_reconfigure() will return %TRUE after this call.
1599 gst_pad_mark_reconfigure (GstPad * pad)
1601 g_return_if_fail (GST_IS_PAD (pad));
1603 GST_OBJECT_LOCK (pad);
1604 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
1605 GST_OBJECT_UNLOCK (pad);
1609 * gst_pad_set_activate_function:
1611 * @f: the #GstPadActivateFunction to set.
1613 * Calls gst_pad_set_activate_function_full() with %NULL for the user_data and
1617 * gst_pad_set_activate_function_full:
1619 * @activate: the #GstPadActivateFunction to set.
1620 * @user_data: user_data passed to @notify
1621 * @notify: notify called when @activate will not be used anymore.
1623 * Sets the given activate function for @pad. The activate function will
1624 * dispatch to gst_pad_activate_mode() to perform the actual activation.
1625 * Only makes sense to set on sink pads.
1627 * Call this function if your sink pad can start a pull-based task.
1630 gst_pad_set_activate_function_full (GstPad * pad,
1631 GstPadActivateFunction activate, gpointer user_data, GDestroyNotify notify)
1633 g_return_if_fail (GST_IS_PAD (pad));
1635 if (pad->activatenotify)
1636 pad->activatenotify (pad->activatedata);
1637 GST_PAD_ACTIVATEFUNC (pad) = activate;
1638 pad->activatedata = user_data;
1639 pad->activatenotify = notify;
1641 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "activatefunc set to %s",
1642 GST_DEBUG_FUNCPTR_NAME (activate));
1646 * gst_pad_set_activatemode_function:
1648 * @f: the #GstPadActivateModeFunction to set.
1650 * Calls gst_pad_set_activatemode_function_full() with %NULL for the user_data and
1654 * gst_pad_set_activatemode_function_full:
1656 * @activatemode: the #GstPadActivateModeFunction to set.
1657 * @user_data: user_data passed to @notify
1658 * @notify: notify called when @activatemode will not be used anymore.
1660 * Sets the given activate_mode function for the pad. An activate_mode function
1661 * prepares the element for data passing.
1664 gst_pad_set_activatemode_function_full (GstPad * pad,
1665 GstPadActivateModeFunction activatemode, gpointer user_data,
1666 GDestroyNotify notify)
1668 g_return_if_fail (GST_IS_PAD (pad));
1670 if (pad->activatemodenotify)
1671 pad->activatemodenotify (pad->activatemodedata);
1672 GST_PAD_ACTIVATEMODEFUNC (pad) = activatemode;
1673 pad->activatemodedata = user_data;
1674 pad->activatemodenotify = notify;
1676 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "activatemodefunc set to %s",
1677 GST_DEBUG_FUNCPTR_NAME (activatemode));
1681 * gst_pad_set_chain_function:
1682 * @p: a sink #GstPad.
1683 * @f: the #GstPadChainFunction to set.
1685 * Calls gst_pad_set_chain_function_full() with %NULL for the user_data and
1689 * gst_pad_set_chain_function_full:
1690 * @pad: a sink #GstPad.
1691 * @chain: the #GstPadChainFunction to set.
1692 * @user_data: user_data passed to @notify
1693 * @notify: notify called when @chain will not be used anymore.
1695 * Sets the given chain function for the pad. The chain function is called to
1696 * process a #GstBuffer input buffer. see #GstPadChainFunction for more details.
1699 gst_pad_set_chain_function_full (GstPad * pad, GstPadChainFunction chain,
1700 gpointer user_data, GDestroyNotify notify)
1702 g_return_if_fail (GST_IS_PAD (pad));
1703 g_return_if_fail (GST_PAD_IS_SINK (pad));
1705 if (pad->chainnotify)
1706 pad->chainnotify (pad->chaindata);
1707 GST_PAD_CHAINFUNC (pad) = chain;
1708 pad->chaindata = user_data;
1709 pad->chainnotify = notify;
1711 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "chainfunc set to %s",
1712 GST_DEBUG_FUNCPTR_NAME (chain));
1716 * gst_pad_set_chain_list_function:
1717 * @p: a sink #GstPad.
1718 * @f: the #GstPadChainListFunction to set.
1720 * Calls gst_pad_set_chain_list_function_full() with %NULL for the user_data and
1724 * gst_pad_set_chain_list_function_full:
1725 * @pad: a sink #GstPad.
1726 * @chainlist: the #GstPadChainListFunction to set.
1727 * @user_data: user_data passed to @notify
1728 * @notify: notify called when @chainlist will not be used anymore.
1730 * Sets the given chain list function for the pad. The chainlist function is
1731 * called to process a #GstBufferList input buffer list. See
1732 * #GstPadChainListFunction for more details.
1735 gst_pad_set_chain_list_function_full (GstPad * pad,
1736 GstPadChainListFunction chainlist, gpointer user_data,
1737 GDestroyNotify notify)
1739 g_return_if_fail (GST_IS_PAD (pad));
1740 g_return_if_fail (GST_PAD_IS_SINK (pad));
1742 if (pad->chainlistnotify)
1743 pad->chainlistnotify (pad->chainlistdata);
1744 GST_PAD_CHAINLISTFUNC (pad) = chainlist;
1745 pad->chainlistdata = user_data;
1746 pad->chainlistnotify = notify;
1748 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "chainlistfunc set to %s",
1749 GST_DEBUG_FUNCPTR_NAME (chainlist));
1753 * gst_pad_set_getrange_function:
1754 * @p: a source #GstPad.
1755 * @f: the #GstPadGetRangeFunction to set.
1757 * Calls gst_pad_set_getrange_function_full() with %NULL for the user_data and
1761 * gst_pad_set_getrange_function_full:
1762 * @pad: a source #GstPad.
1763 * @get: the #GstPadGetRangeFunction to set.
1764 * @user_data: user_data passed to @notify
1765 * @notify: notify called when @get will not be used anymore.
1767 * Sets the given getrange function for the pad. The getrange function is
1768 * called to produce a new #GstBuffer to start the processing pipeline. see
1769 * #GstPadGetRangeFunction for a description of the getrange function.
1772 gst_pad_set_getrange_function_full (GstPad * pad, GstPadGetRangeFunction get,
1773 gpointer user_data, GDestroyNotify notify)
1775 g_return_if_fail (GST_IS_PAD (pad));
1776 g_return_if_fail (GST_PAD_IS_SRC (pad));
1778 if (pad->getrangenotify)
1779 pad->getrangenotify (pad->getrangedata);
1780 GST_PAD_GETRANGEFUNC (pad) = get;
1781 pad->getrangedata = user_data;
1782 pad->getrangenotify = notify;
1784 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "getrangefunc set to %s",
1785 GST_DEBUG_FUNCPTR_NAME (get));
1789 * gst_pad_set_event_function:
1790 * @p: a #GstPad of either direction.
1791 * @f: the #GstPadEventFunction to set.
1793 * Calls gst_pad_set_event_function_full() with %NULL for the user_data and
1797 * gst_pad_set_event_function_full:
1798 * @pad: a #GstPad of either direction.
1799 * @event: the #GstPadEventFunction to set.
1800 * @user_data: user_data passed to @notify
1801 * @notify: notify called when @event will not be used anymore.
1803 * Sets the given event handler for the pad.
1806 gst_pad_set_event_function_full (GstPad * pad, GstPadEventFunction event,
1807 gpointer user_data, GDestroyNotify notify)
1809 g_return_if_fail (GST_IS_PAD (pad));
1811 if (pad->eventnotify)
1812 pad->eventnotify (pad->eventdata);
1813 GST_PAD_EVENTFUNC (pad) = event;
1814 pad->eventdata = user_data;
1815 pad->eventnotify = notify;
1817 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "eventfunc for set to %s",
1818 GST_DEBUG_FUNCPTR_NAME (event));
1822 * gst_pad_set_query_function:
1823 * @p: a #GstPad of either direction.
1824 * @f: the #GstPadQueryFunction to set.
1826 * Calls gst_pad_set_query_function_full() with %NULL for the user_data and
1830 * gst_pad_set_query_function_full:
1831 * @pad: a #GstPad of either direction.
1832 * @query: the #GstPadQueryFunction to set.
1833 * @user_data: user_data passed to @notify
1834 * @notify: notify called when @query will not be used anymore.
1836 * Set the given query function for the pad.
1839 gst_pad_set_query_function_full (GstPad * pad, GstPadQueryFunction query,
1840 gpointer user_data, GDestroyNotify notify)
1842 g_return_if_fail (GST_IS_PAD (pad));
1844 if (pad->querynotify)
1845 pad->querynotify (pad->querydata);
1846 GST_PAD_QUERYFUNC (pad) = query;
1847 pad->querydata = user_data;
1848 pad->querynotify = notify;
1850 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "queryfunc set to %s",
1851 GST_DEBUG_FUNCPTR_NAME (query));
1855 * gst_pad_set_iterate_internal_links_function:
1856 * @p: a #GstPad of either direction.
1857 * @f: the #GstPadIterIntLinkFunction to set.
1859 * Calls gst_pad_set_iterate_internal_links_function_full() with %NULL
1860 * for the user_data and notify.
1863 * gst_pad_set_iterate_internal_links_function_full:
1864 * @pad: a #GstPad of either direction.
1865 * @iterintlink: the #GstPadIterIntLinkFunction to set.
1866 * @user_data: user_data passed to @notify
1867 * @notify: notify called when @iterintlink will not be used anymore.
1869 * Sets the given internal link iterator function for the pad.
1872 gst_pad_set_iterate_internal_links_function_full (GstPad * pad,
1873 GstPadIterIntLinkFunction iterintlink, gpointer user_data,
1874 GDestroyNotify notify)
1876 g_return_if_fail (GST_IS_PAD (pad));
1878 if (pad->iterintlinknotify)
1879 pad->iterintlinknotify (pad->iterintlinkdata);
1880 GST_PAD_ITERINTLINKFUNC (pad) = iterintlink;
1881 pad->iterintlinkdata = user_data;
1882 pad->iterintlinknotify = notify;
1884 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "internal link iterator set to %s",
1885 GST_DEBUG_FUNCPTR_NAME (iterintlink));
1889 * gst_pad_set_link_function:
1891 * @f: the #GstPadLinkFunction to set.
1893 * Calls gst_pad_set_link_function_full() with %NULL
1894 * for the user_data and notify.
1897 * gst_pad_set_link_function_full:
1899 * @link: the #GstPadLinkFunction to set.
1900 * @user_data: user_data passed to @notify
1901 * @notify: notify called when @link will not be used anymore.
1903 * Sets the given link function for the pad. It will be called when
1904 * the pad is linked with another pad.
1906 * The return value #GST_PAD_LINK_OK should be used when the connection can be
1909 * The return value #GST_PAD_LINK_REFUSED should be used when the connection
1910 * cannot be made for some reason.
1912 * If @link is installed on a source pad, it should call the #GstPadLinkFunction
1913 * of the peer sink pad, if present.
1916 gst_pad_set_link_function_full (GstPad * pad, GstPadLinkFunction link,
1917 gpointer user_data, GDestroyNotify notify)
1919 g_return_if_fail (GST_IS_PAD (pad));
1921 if (pad->linknotify)
1922 pad->linknotify (pad->linkdata);
1923 GST_PAD_LINKFUNC (pad) = link;
1924 pad->linkdata = user_data;
1925 pad->linknotify = notify;
1927 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "linkfunc set to %s",
1928 GST_DEBUG_FUNCPTR_NAME (link));
1932 * gst_pad_set_unlink_function:
1934 * @f: the #GstPadUnlinkFunction to set.
1936 * Calls gst_pad_set_unlink_function_full() with %NULL
1937 * for the user_data and notify.
1940 * gst_pad_set_unlink_function_full:
1942 * @unlink: the #GstPadUnlinkFunction to set.
1943 * @user_data: user_data passed to @notify
1944 * @notify: notify called when @unlink will not be used anymore.
1946 * Sets the given unlink function for the pad. It will be called
1947 * when the pad is unlinked.
1950 gst_pad_set_unlink_function_full (GstPad * pad, GstPadUnlinkFunction unlink,
1951 gpointer user_data, GDestroyNotify notify)
1953 g_return_if_fail (GST_IS_PAD (pad));
1955 if (pad->unlinknotify)
1956 pad->unlinknotify (pad->unlinkdata);
1957 GST_PAD_UNLINKFUNC (pad) = unlink;
1958 pad->unlinkdata = user_data;
1959 pad->unlinknotify = notify;
1961 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "unlinkfunc set to %s",
1962 GST_DEBUG_FUNCPTR_NAME (unlink));
1967 * @srcpad: the source #GstPad to unlink.
1968 * @sinkpad: the sink #GstPad to unlink.
1970 * Unlinks the source pad from the sink pad. Will emit the #GstPad::unlinked
1971 * signal on both pads.
1973 * Returns: %TRUE if the pads were unlinked. This function returns %FALSE if
1974 * the pads were not linked together.
1979 gst_pad_unlink (GstPad * srcpad, GstPad * sinkpad)
1981 gboolean result = FALSE;
1982 GstElement *parent = NULL;
1984 g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
1985 g_return_val_if_fail (GST_PAD_IS_SRC (srcpad), FALSE);
1986 g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
1987 g_return_val_if_fail (GST_PAD_IS_SINK (sinkpad), FALSE);
1989 GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinking %s:%s(%p) and %s:%s(%p)",
1990 GST_DEBUG_PAD_NAME (srcpad), srcpad,
1991 GST_DEBUG_PAD_NAME (sinkpad), sinkpad);
1993 /* We need to notify the parent before taking any pad locks as the bin in
1994 * question might be waiting for a lock on the pad while holding its lock
1995 * that our message will try to take. */
1996 if ((parent = GST_ELEMENT_CAST (gst_pad_get_parent (srcpad)))) {
1997 if (GST_IS_ELEMENT (parent)) {
1998 gst_element_post_message (parent,
1999 gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
2000 GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK, parent, TRUE));
2002 gst_object_unref (parent);
2007 GST_OBJECT_LOCK (srcpad);
2008 GST_OBJECT_LOCK (sinkpad);
2010 if (G_UNLIKELY (GST_PAD_PEER (srcpad) != sinkpad))
2011 goto not_linked_together;
2013 if (GST_PAD_UNLINKFUNC (srcpad)) {
2014 GstObject *tmpparent;
2016 ACQUIRE_PARENT (srcpad, tmpparent, no_src_parent);
2018 GST_PAD_UNLINKFUNC (srcpad) (srcpad, tmpparent);
2019 RELEASE_PARENT (tmpparent);
2022 if (GST_PAD_UNLINKFUNC (sinkpad)) {
2023 GstObject *tmpparent;
2025 ACQUIRE_PARENT (sinkpad, tmpparent, no_sink_parent);
2027 GST_PAD_UNLINKFUNC (sinkpad) (sinkpad, tmpparent);
2028 RELEASE_PARENT (tmpparent);
2032 /* first clear peers */
2033 GST_PAD_PEER (srcpad) = NULL;
2034 GST_PAD_PEER (sinkpad) = NULL;
2036 GST_OBJECT_UNLOCK (sinkpad);
2037 GST_OBJECT_UNLOCK (srcpad);
2039 /* fire off a signal to each of the pads telling them
2040 * that they've been unlinked */
2041 g_signal_emit (srcpad, gst_pad_signals[PAD_UNLINKED], 0, sinkpad);
2042 g_signal_emit (sinkpad, gst_pad_signals[PAD_UNLINKED], 0, srcpad);
2044 GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinked %s:%s and %s:%s",
2045 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
2050 if (parent != NULL) {
2051 gst_element_post_message (parent,
2052 gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
2053 GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK, parent, FALSE));
2054 gst_object_unref (parent);
2059 not_linked_together:
2061 /* we do not emit a warning in this case because unlinking cannot
2062 * be made MT safe.*/
2063 GST_OBJECT_UNLOCK (sinkpad);
2064 GST_OBJECT_UNLOCK (srcpad);
2070 * gst_pad_is_linked:
2071 * @pad: pad to check
2073 * Checks if a @pad is linked to another pad or not.
2075 * Returns: %TRUE if the pad is linked, %FALSE otherwise.
2080 gst_pad_is_linked (GstPad * pad)
2084 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2086 GST_OBJECT_LOCK (pad);
2087 result = (GST_PAD_PEER (pad) != NULL);
2088 GST_OBJECT_UNLOCK (pad);
2093 /* get the caps from both pads and see if the intersection
2096 * This function should be called with the pad LOCK on both
2100 gst_pad_link_check_compatible_unlocked (GstPad * src, GstPad * sink,
2101 GstPadLinkCheck flags)
2103 GstCaps *srccaps = NULL;
2104 GstCaps *sinkcaps = NULL;
2105 gboolean compatible = FALSE;
2107 if (!(flags & (GST_PAD_LINK_CHECK_CAPS | GST_PAD_LINK_CHECK_TEMPLATE_CAPS)))
2110 /* Doing the expensive caps checking takes priority over only checking the template caps */
2111 if (flags & GST_PAD_LINK_CHECK_CAPS) {
2112 GST_OBJECT_UNLOCK (sink);
2113 GST_OBJECT_UNLOCK (src);
2115 srccaps = gst_pad_query_caps (src, NULL);
2116 sinkcaps = gst_pad_query_caps (sink, NULL);
2118 GST_OBJECT_LOCK (src);
2119 GST_OBJECT_LOCK (sink);
2121 /* If one of the two pads doesn't have a template, consider the intersection
2123 if (G_UNLIKELY ((GST_PAD_PAD_TEMPLATE (src) == NULL)
2124 || (GST_PAD_PAD_TEMPLATE (sink) == NULL))) {
2128 srccaps = gst_caps_ref (GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (src)));
2130 gst_caps_ref (GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (sink)));
2133 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, src, "src caps %" GST_PTR_FORMAT,
2135 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, sink, "sink caps %" GST_PTR_FORMAT,
2138 /* if we have caps on both pads we can check the intersection. If one
2139 * of the caps is %NULL, we return %TRUE. */
2140 if (G_UNLIKELY (srccaps == NULL || sinkcaps == NULL)) {
2142 gst_caps_unref (srccaps);
2144 gst_caps_unref (sinkcaps);
2148 compatible = gst_caps_can_intersect (srccaps, sinkcaps);
2149 gst_caps_unref (srccaps);
2150 gst_caps_unref (sinkcaps);
2153 GST_CAT_DEBUG (GST_CAT_CAPS, "caps are %scompatible",
2154 (compatible ? "" : "not "));
2159 /* check if the grandparents of both pads are the same.
2160 * This check is required so that we don't try to link
2161 * pads from elements in different bins without ghostpads.
2163 * The LOCK should be held on both pads
2166 gst_pad_link_check_hierarchy (GstPad * src, GstPad * sink)
2168 GstObject *psrc, *psink;
2170 psrc = GST_OBJECT_PARENT (src);
2171 psink = GST_OBJECT_PARENT (sink);
2173 /* if one of the pads has no parent, we allow the link */
2174 if (G_UNLIKELY (psrc == NULL || psink == NULL))
2177 /* only care about parents that are elements */
2178 if (G_UNLIKELY (!GST_IS_ELEMENT (psrc) || !GST_IS_ELEMENT (psink)))
2179 goto no_element_parent;
2181 /* if the parents are the same, we have a loop */
2182 if (G_UNLIKELY (psrc == psink))
2185 /* if they both have a parent, we check the grandparents. We can not lock
2186 * the parent because we hold on the child (pad) and the locking order is
2187 * parent >> child. */
2188 psrc = GST_OBJECT_PARENT (psrc);
2189 psink = GST_OBJECT_PARENT (psink);
2191 /* if they have grandparents but they are not the same */
2192 if (G_UNLIKELY (psrc != psink))
2193 goto wrong_grandparents;
2200 GST_CAT_DEBUG (GST_CAT_CAPS,
2201 "one of the pads has no parent %" GST_PTR_FORMAT " and %"
2202 GST_PTR_FORMAT, psrc, psink);
2207 GST_CAT_DEBUG (GST_CAT_CAPS,
2208 "one of the pads has no element parent %" GST_PTR_FORMAT " and %"
2209 GST_PTR_FORMAT, psrc, psink);
2214 GST_CAT_DEBUG (GST_CAT_CAPS, "pads have same parent %" GST_PTR_FORMAT,
2220 GST_CAT_DEBUG (GST_CAT_CAPS,
2221 "pads have different grandparents %" GST_PTR_FORMAT " and %"
2222 GST_PTR_FORMAT, psrc, psink);
2227 /* FIXME leftover from an attempt at refactoring... */
2228 /* call with the two pads unlocked, when this function returns GST_PAD_LINK_OK,
2229 * the two pads will be locked in the srcpad, sinkpad order. */
2230 static GstPadLinkReturn
2231 gst_pad_link_prepare (GstPad * srcpad, GstPad * sinkpad, GstPadLinkCheck flags)
2233 GST_CAT_INFO (GST_CAT_PADS, "trying to link %s:%s and %s:%s",
2234 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
2236 GST_OBJECT_LOCK (srcpad);
2238 if (G_UNLIKELY (GST_PAD_PEER (srcpad) != NULL))
2239 goto src_was_linked;
2241 GST_OBJECT_LOCK (sinkpad);
2243 if (G_UNLIKELY (GST_PAD_PEER (sinkpad) != NULL))
2244 goto sink_was_linked;
2246 /* check hierarchy, pads can only be linked if the grandparents
2248 if ((flags & GST_PAD_LINK_CHECK_HIERARCHY)
2249 && !gst_pad_link_check_hierarchy (srcpad, sinkpad))
2250 goto wrong_hierarchy;
2252 /* check pad caps for non-empty intersection */
2253 if (!gst_pad_link_check_compatible_unlocked (srcpad, sinkpad, flags))
2256 /* FIXME check pad scheduling for non-empty intersection */
2258 return GST_PAD_LINK_OK;
2262 GST_CAT_INFO (GST_CAT_PADS, "src %s:%s was already linked to %s:%s",
2263 GST_DEBUG_PAD_NAME (srcpad),
2264 GST_DEBUG_PAD_NAME (GST_PAD_PEER (srcpad)));
2265 /* we do not emit a warning in this case because unlinking cannot
2266 * be made MT safe.*/
2267 GST_OBJECT_UNLOCK (srcpad);
2268 return GST_PAD_LINK_WAS_LINKED;
2272 GST_CAT_INFO (GST_CAT_PADS, "sink %s:%s was already linked to %s:%s",
2273 GST_DEBUG_PAD_NAME (sinkpad),
2274 GST_DEBUG_PAD_NAME (GST_PAD_PEER (sinkpad)));
2275 /* we do not emit a warning in this case because unlinking cannot
2276 * be made MT safe.*/
2277 GST_OBJECT_UNLOCK (sinkpad);
2278 GST_OBJECT_UNLOCK (srcpad);
2279 return GST_PAD_LINK_WAS_LINKED;
2283 GST_CAT_INFO (GST_CAT_PADS, "pads have wrong hierarchy");
2284 GST_OBJECT_UNLOCK (sinkpad);
2285 GST_OBJECT_UNLOCK (srcpad);
2286 return GST_PAD_LINK_WRONG_HIERARCHY;
2290 GST_CAT_INFO (GST_CAT_PADS, "caps are incompatible");
2291 GST_OBJECT_UNLOCK (sinkpad);
2292 GST_OBJECT_UNLOCK (srcpad);
2293 return GST_PAD_LINK_NOFORMAT;
2299 * @srcpad: the source #GstPad.
2300 * @sinkpad: the sink #GstPad.
2302 * Checks if the source pad and the sink pad are compatible so they can be
2305 * Returns: %TRUE if the pads can be linked.
2308 gst_pad_can_link (GstPad * srcpad, GstPad * sinkpad)
2310 GstPadLinkReturn result;
2312 /* generic checks */
2313 g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
2314 g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
2316 GST_CAT_INFO (GST_CAT_PADS, "check if %s:%s can link with %s:%s",
2317 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
2319 /* gst_pad_link_prepare does everything for us, we only release the locks
2320 * on the pads that it gets us. If this function returns !OK the locks are not
2322 result = gst_pad_link_prepare (srcpad, sinkpad, GST_PAD_LINK_CHECK_DEFAULT);
2323 if (result != GST_PAD_LINK_OK)
2326 GST_OBJECT_UNLOCK (srcpad);
2327 GST_OBJECT_UNLOCK (sinkpad);
2330 return result == GST_PAD_LINK_OK;
2334 * gst_pad_link_full:
2335 * @srcpad: the source #GstPad to link.
2336 * @sinkpad: the sink #GstPad to link.
2337 * @flags: the checks to validate when linking
2339 * Links the source pad and the sink pad.
2341 * This variant of #gst_pad_link provides a more granular control on the
2342 * checks being done when linking. While providing some considerable speedups
2343 * the caller of this method must be aware that wrong usage of those flags
2344 * can cause severe issues. Refer to the documentation of #GstPadLinkCheck
2345 * for more information.
2349 * Returns: A result code indicating if the connection worked or
2353 gst_pad_link_full (GstPad * srcpad, GstPad * sinkpad, GstPadLinkCheck flags)
2355 GstPadLinkReturn result;
2357 GstPadLinkFunction srcfunc, sinkfunc;
2359 g_return_val_if_fail (GST_IS_PAD (srcpad), GST_PAD_LINK_REFUSED);
2360 g_return_val_if_fail (GST_PAD_IS_SRC (srcpad), GST_PAD_LINK_WRONG_DIRECTION);
2361 g_return_val_if_fail (GST_IS_PAD (sinkpad), GST_PAD_LINK_REFUSED);
2362 g_return_val_if_fail (GST_PAD_IS_SINK (sinkpad),
2363 GST_PAD_LINK_WRONG_DIRECTION);
2365 /* Notify the parent early. See gst_pad_unlink for details. */
2366 if (G_LIKELY ((parent = GST_ELEMENT_CAST (gst_pad_get_parent (srcpad))))) {
2367 if (G_LIKELY (GST_IS_ELEMENT (parent))) {
2368 gst_element_post_message (parent,
2369 gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
2370 GST_STRUCTURE_CHANGE_TYPE_PAD_LINK, parent, TRUE));
2372 gst_object_unref (parent);
2377 /* prepare will also lock the two pads */
2378 result = gst_pad_link_prepare (srcpad, sinkpad, flags);
2380 if (G_UNLIKELY (result != GST_PAD_LINK_OK)) {
2381 GST_CAT_INFO (GST_CAT_PADS, "link between %s:%s and %s:%s failed: %s",
2382 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad),
2383 gst_pad_link_get_name (result));
2387 /* must set peers before calling the link function */
2388 GST_PAD_PEER (srcpad) = sinkpad;
2389 GST_PAD_PEER (sinkpad) = srcpad;
2391 /* check events, when something is different, mark pending */
2392 schedule_events (srcpad, sinkpad);
2394 /* get the link functions */
2395 srcfunc = GST_PAD_LINKFUNC (srcpad);
2396 sinkfunc = GST_PAD_LINKFUNC (sinkpad);
2398 if (G_UNLIKELY (srcfunc || sinkfunc)) {
2399 /* custom link functions, execute them */
2400 GST_OBJECT_UNLOCK (sinkpad);
2401 GST_OBJECT_UNLOCK (srcpad);
2404 GstObject *tmpparent;
2406 ACQUIRE_PARENT (srcpad, tmpparent, no_parent);
2407 /* this one will call the peer link function */
2408 result = srcfunc (srcpad, tmpparent, sinkpad);
2409 RELEASE_PARENT (tmpparent);
2410 } else if (sinkfunc) {
2411 GstObject *tmpparent;
2413 ACQUIRE_PARENT (sinkpad, tmpparent, no_parent);
2414 /* if no source link function, we need to call the sink link
2415 * function ourselves. */
2416 result = sinkfunc (sinkpad, tmpparent, srcpad);
2417 RELEASE_PARENT (tmpparent);
2421 GST_OBJECT_LOCK (srcpad);
2422 GST_OBJECT_LOCK (sinkpad);
2424 /* we released the lock, check if the same pads are linked still */
2425 if (GST_PAD_PEER (srcpad) != sinkpad || GST_PAD_PEER (sinkpad) != srcpad)
2426 goto concurrent_link;
2428 if (G_UNLIKELY (result != GST_PAD_LINK_OK))
2431 GST_OBJECT_UNLOCK (sinkpad);
2432 GST_OBJECT_UNLOCK (srcpad);
2434 /* fire off a signal to each of the pads telling them
2435 * that they've been linked */
2436 g_signal_emit (srcpad, gst_pad_signals[PAD_LINKED], 0, sinkpad);
2437 g_signal_emit (sinkpad, gst_pad_signals[PAD_LINKED], 0, srcpad);
2439 GST_CAT_INFO (GST_CAT_PADS, "linked %s:%s and %s:%s, successful",
2440 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
2442 gst_pad_send_event (srcpad, gst_event_new_reconfigure ());
2445 if (G_LIKELY (parent)) {
2446 gst_element_post_message (parent,
2447 gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
2448 GST_STRUCTURE_CHANGE_TYPE_PAD_LINK, parent, FALSE));
2449 gst_object_unref (parent);
2457 GST_CAT_INFO (GST_CAT_PADS, "concurrent link between %s:%s and %s:%s",
2458 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
2459 GST_OBJECT_UNLOCK (sinkpad);
2460 GST_OBJECT_UNLOCK (srcpad);
2462 /* The other link operation succeeded first */
2463 result = GST_PAD_LINK_WAS_LINKED;
2468 GST_CAT_INFO (GST_CAT_PADS, "link between %s:%s and %s:%s failed: %s",
2469 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad),
2470 gst_pad_link_get_name (result));
2472 GST_PAD_PEER (srcpad) = NULL;
2473 GST_PAD_PEER (sinkpad) = NULL;
2475 GST_OBJECT_UNLOCK (sinkpad);
2476 GST_OBJECT_UNLOCK (srcpad);
2484 * @srcpad: the source #GstPad to link.
2485 * @sinkpad: the sink #GstPad to link.
2487 * Links the source pad and the sink pad.
2489 * Returns: A result code indicating if the connection worked or
2495 gst_pad_link (GstPad * srcpad, GstPad * sinkpad)
2497 return gst_pad_link_full (srcpad, sinkpad, GST_PAD_LINK_CHECK_DEFAULT);
2501 gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ)
2503 GstPadTemplate **template_p;
2505 /* this function would need checks if it weren't static */
2507 GST_OBJECT_LOCK (pad);
2508 template_p = &pad->padtemplate;
2509 gst_object_replace ((GstObject **) template_p, (GstObject *) templ);
2510 GST_OBJECT_UNLOCK (pad);
2513 gst_pad_template_pad_created (templ, pad);
2517 * gst_pad_get_pad_template:
2520 * Gets the template for @pad.
2522 * Returns: (transfer full) (nullable): the #GstPadTemplate from which
2523 * this pad was instantiated, or %NULL if this pad has no
2524 * template. Unref after usage.
2527 gst_pad_get_pad_template (GstPad * pad)
2529 GstPadTemplate *templ;
2531 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2533 templ = GST_PAD_PAD_TEMPLATE (pad);
2535 return (templ ? gst_object_ref (templ) : NULL);
2539 * gst_pad_has_current_caps:
2540 * @pad: a #GstPad to check
2542 * Check if @pad has caps set on it with a #GST_EVENT_CAPS event.
2544 * Returns: %TRUE when @pad has caps associated with it.
2547 gst_pad_has_current_caps (GstPad * pad)
2552 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2554 GST_OBJECT_LOCK (pad);
2555 caps = get_pad_caps (pad);
2556 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
2557 "check current pad caps %" GST_PTR_FORMAT, caps);
2558 result = (caps != NULL);
2559 GST_OBJECT_UNLOCK (pad);
2565 * gst_pad_get_current_caps:
2566 * @pad: a #GstPad to get the current capabilities of.
2568 * Gets the capabilities currently configured on @pad with the last
2569 * #GST_EVENT_CAPS event.
2571 * Returns: the current caps of the pad with incremented ref-count.
2574 gst_pad_get_current_caps (GstPad * pad)
2578 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2580 GST_OBJECT_LOCK (pad);
2581 if ((result = get_pad_caps (pad)))
2582 gst_caps_ref (result);
2583 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
2584 "get current pad caps %" GST_PTR_FORMAT, result);
2585 GST_OBJECT_UNLOCK (pad);
2591 * gst_pad_get_pad_template_caps:
2592 * @pad: a #GstPad to get the template capabilities from.
2594 * Gets the capabilities for @pad's template.
2596 * Returns: (transfer full): the #GstCaps of this pad template.
2597 * Unref after usage.
2600 gst_pad_get_pad_template_caps (GstPad * pad)
2602 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2604 if (GST_PAD_PAD_TEMPLATE (pad))
2605 return gst_pad_template_get_caps (GST_PAD_PAD_TEMPLATE (pad));
2607 return gst_caps_ref (GST_CAPS_ANY);
2612 * @pad: a #GstPad to get the peer of.
2614 * Gets the peer of @pad. This function refs the peer pad so
2615 * you need to unref it after use.
2617 * Returns: (transfer full): the peer #GstPad. Unref after usage.
2622 gst_pad_get_peer (GstPad * pad)
2626 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2628 GST_OBJECT_LOCK (pad);
2629 result = GST_PAD_PEER (pad);
2631 gst_object_ref (result);
2632 GST_OBJECT_UNLOCK (pad);
2638 * gst_pad_get_allowed_caps:
2641 * Gets the capabilities of the allowed media types that can flow through
2642 * @pad and its peer.
2644 * The allowed capabilities is calculated as the intersection of the results of
2645 * calling gst_pad_query_caps() on @pad and its peer. The caller owns a reference
2646 * on the resulting caps.
2648 * Returns: (transfer full) (nullable): the allowed #GstCaps of the
2649 * pad link. Unref the caps when you no longer need it. This
2650 * function returns %NULL when @pad has no peer.
2655 gst_pad_get_allowed_caps (GstPad * pad)
2658 GstCaps *caps = NULL;
2661 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2663 GST_OBJECT_LOCK (pad);
2664 if (G_UNLIKELY (GST_PAD_PEER (pad) == NULL))
2666 GST_OBJECT_UNLOCK (pad);
2668 GST_CAT_DEBUG_OBJECT (GST_CAT_PROPERTIES, pad, "getting allowed caps");
2670 mycaps = gst_pad_query_caps (pad, NULL);
2672 /* Query peer caps */
2673 query = gst_query_new_caps (mycaps);
2674 gst_pad_peer_query (pad, query);
2675 gst_query_parse_caps_result (query, &caps);
2676 gst_caps_ref (caps);
2677 gst_query_unref (query);
2679 gst_caps_unref (mycaps);
2681 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "allowed caps %" GST_PTR_FORMAT,
2688 GST_CAT_DEBUG_OBJECT (GST_CAT_PROPERTIES, pad, "no peer");
2689 GST_OBJECT_UNLOCK (pad);
2696 * gst_pad_iterate_internal_links_default:
2697 * @pad: the #GstPad to get the internal links of.
2698 * @parent: (allow-none): the parent of @pad or %NULL
2700 * Iterate the list of pads to which the given pad is linked to inside of
2701 * the parent element.
2702 * This is the default handler, and thus returns an iterator of all of the
2703 * pads inside the parent element with opposite direction.
2705 * The caller must free this iterator after use with gst_iterator_free().
2707 * Returns: (nullable): a #GstIterator of #GstPad, or %NULL if @pad
2708 * has no parent. Unref each returned pad with gst_object_unref().
2711 gst_pad_iterate_internal_links_default (GstPad * pad, GstObject * parent)
2718 GstElement *eparent;
2720 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2722 if (parent != NULL && GST_IS_ELEMENT (parent)) {
2723 eparent = GST_ELEMENT_CAST (gst_object_ref (parent));
2725 GST_OBJECT_LOCK (pad);
2726 eparent = GST_PAD_PARENT (pad);
2727 if (!eparent || !GST_IS_ELEMENT (eparent))
2730 gst_object_ref (eparent);
2731 GST_OBJECT_UNLOCK (pad);
2734 if (pad->direction == GST_PAD_SRC)
2735 padlist = &eparent->sinkpads;
2737 padlist = &eparent->srcpads;
2739 GST_DEBUG_OBJECT (pad, "Making iterator");
2741 cookie = &eparent->pads_cookie;
2743 lock = GST_OBJECT_GET_LOCK (eparent);
2745 res = gst_iterator_new_list (GST_TYPE_PAD,
2746 lock, cookie, padlist, (GObject *) owner, NULL);
2748 gst_object_unref (owner);
2755 GST_OBJECT_UNLOCK (pad);
2756 GST_DEBUG_OBJECT (pad, "no parent element");
2762 * gst_pad_iterate_internal_links:
2763 * @pad: the GstPad to get the internal links of.
2765 * Gets an iterator for the pads to which the given pad is linked to inside
2766 * of the parent element.
2768 * Each #GstPad element yielded by the iterator will have its refcount increased,
2769 * so unref after use.
2771 * Free-function: gst_iterator_free
2773 * Returns: (transfer full) (nullable): a new #GstIterator of #GstPad
2774 * or %NULL when the pad does not have an iterator function
2775 * configured. Use gst_iterator_free() after usage.
2778 gst_pad_iterate_internal_links (GstPad * pad)
2780 GstIterator *res = NULL;
2783 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2785 GST_OBJECT_LOCK (pad);
2786 ACQUIRE_PARENT (pad, parent, no_parent);
2787 GST_OBJECT_UNLOCK (pad);
2789 if (GST_PAD_ITERINTLINKFUNC (pad))
2790 res = GST_PAD_ITERINTLINKFUNC (pad) (pad, parent);
2792 RELEASE_PARENT (parent);
2799 GST_DEBUG_OBJECT (pad, "no parent");
2800 GST_OBJECT_UNLOCK (pad);
2808 * @forward: (scope call): a #GstPadForwardFunction
2809 * @user_data: user data passed to @forward
2811 * Calls @forward for all internally linked pads of @pad. This function deals with
2812 * dynamically changing internal pads and will make sure that the @forward
2813 * function is only called once for each pad.
2815 * When @forward returns %TRUE, no further pads will be processed.
2817 * Returns: %TRUE if one of the dispatcher functions returned %TRUE.
2820 gst_pad_forward (GstPad * pad, GstPadForwardFunction forward,
2823 gboolean result = FALSE;
2825 gboolean done = FALSE;
2826 GValue item = { 0, };
2827 GList *pushed_pads = NULL;
2829 iter = gst_pad_iterate_internal_links (pad);
2835 switch (gst_iterator_next (iter, &item)) {
2836 case GST_ITERATOR_OK:
2840 intpad = g_value_get_object (&item);
2842 /* if already pushed, skip. FIXME, find something faster to tag pads */
2843 if (intpad == NULL || g_list_find (pushed_pads, intpad)) {
2844 g_value_reset (&item);
2848 GST_LOG_OBJECT (pad, "calling forward function on pad %s:%s",
2849 GST_DEBUG_PAD_NAME (intpad));
2850 done = result = forward (intpad, user_data);
2852 pushed_pads = g_list_prepend (pushed_pads, intpad);
2854 g_value_reset (&item);
2857 case GST_ITERATOR_RESYNC:
2858 /* We don't reset the result here because we don't push the event
2859 * again on pads that got the event already and because we need
2860 * to consider the result of the previous pushes */
2861 gst_iterator_resync (iter);
2863 case GST_ITERATOR_ERROR:
2864 GST_ERROR_OBJECT (pad, "Could not iterate over internally linked pads");
2867 case GST_ITERATOR_DONE:
2872 g_value_unset (&item);
2873 gst_iterator_free (iter);
2875 g_list_free (pushed_pads);
2885 gboolean dispatched;
2889 event_forward_func (GstPad * pad, EventData * data)
2891 /* for each pad we send to, we should ref the event; it's up
2892 * to downstream to unref again when handled. */
2893 GST_LOG_OBJECT (pad, "Reffing and pushing event %p (%s) to %s:%s",
2894 data->event, GST_EVENT_TYPE_NAME (data->event), GST_DEBUG_PAD_NAME (pad));
2896 data->result |= gst_pad_push_event (pad, gst_event_ref (data->event));
2898 data->dispatched = TRUE;
2905 * gst_pad_event_default:
2906 * @pad: a #GstPad to call the default event handler on.
2907 * @parent: (allow-none): the parent of @pad or %NULL
2908 * @event: (transfer full): the #GstEvent to handle.
2910 * Invokes the default event handler for the given pad.
2912 * The EOS event will pause the task associated with @pad before it is forwarded
2913 * to all internally linked pads,
2915 * The event is sent to all pads internally linked to @pad. This function
2916 * takes ownership of @event.
2918 * Returns: %TRUE if the event was sent successfully.
2921 gst_pad_event_default (GstPad * pad, GstObject * parent, GstEvent * event)
2923 gboolean result, forward = TRUE;
2925 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2926 g_return_val_if_fail (event != NULL, FALSE);
2928 GST_LOG_OBJECT (pad, "default event handler for event %" GST_PTR_FORMAT,
2931 switch (GST_EVENT_TYPE (event)) {
2932 case GST_EVENT_CAPS:
2933 forward = GST_PAD_IS_PROXY_CAPS (pad);
2944 data.dispatched = FALSE;
2945 data.result = FALSE;
2947 gst_pad_forward (pad, (GstPadForwardFunction) event_forward_func, &data);
2949 /* for sinkpads without a parent element or without internal links, nothing
2950 * will be dispatched but we still want to return TRUE. */
2951 if (data.dispatched)
2952 result = data.result;
2957 gst_event_unref (event);
2962 /* Default accept caps implementation just checks against
2963 * the allowed caps for the pad */
2965 gst_pad_query_accept_caps_default (GstPad * pad, GstQuery * query)
2967 /* get the caps and see if it intersects to something not empty */
2968 GstCaps *caps, *allowed;
2971 GST_DEBUG_OBJECT (pad, "query accept-caps %" GST_PTR_FORMAT, query);
2973 /* first forward the query to internally linked pads when we are dealing with
2975 if (GST_PAD_IS_PROXY_CAPS (pad)) {
2976 result = gst_pad_proxy_query_accept_caps (pad, query);
2980 GST_CAT_DEBUG_OBJECT (GST_CAT_PERFORMANCE, pad,
2981 "fallback ACCEPT_CAPS query, consider implementing a specialized version");
2983 gst_query_parse_accept_caps (query, &caps);
2984 if (GST_PAD_IS_ACCEPT_TEMPLATE (pad))
2985 allowed = gst_pad_get_pad_template_caps (pad);
2987 allowed = gst_pad_query_caps (pad, caps);
2990 if (GST_PAD_IS_ACCEPT_INTERSECT (pad)) {
2991 GST_DEBUG_OBJECT (pad,
2992 "allowed caps intersect %" GST_PTR_FORMAT ", caps %" GST_PTR_FORMAT,
2994 result = gst_caps_can_intersect (caps, allowed);
2996 GST_DEBUG_OBJECT (pad, "allowed caps subset %" GST_PTR_FORMAT ", caps %"
2997 GST_PTR_FORMAT, allowed, caps);
2998 result = gst_caps_is_subset (caps, allowed);
3000 gst_caps_unref (allowed);
3002 GST_DEBUG_OBJECT (pad, "no compatible caps allowed on the pad");
3005 gst_query_set_accept_caps_result (query, result);
3011 /* Default caps implementation */
3013 gst_pad_query_caps_default (GstPad * pad, GstQuery * query)
3015 GstCaps *result = NULL, *filter;
3016 GstPadTemplate *templ;
3017 gboolean fixed_caps;
3019 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "query caps %" GST_PTR_FORMAT,
3022 /* first try to proxy if we must */
3023 if (GST_PAD_IS_PROXY_CAPS (pad)) {
3024 if ((gst_pad_proxy_query_caps (pad, query))) {
3029 gst_query_parse_caps (query, &filter);
3031 /* no proxy or it failed, do default handling */
3032 fixed_caps = GST_PAD_IS_FIXED_CAPS (pad);
3034 GST_OBJECT_LOCK (pad);
3036 /* fixed caps, try the negotiated caps first */
3037 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "fixed pad caps: trying pad caps");
3038 if ((result = get_pad_caps (pad)))
3039 goto filter_done_unlock;
3042 if ((templ = GST_PAD_PAD_TEMPLATE (pad))) {
3043 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "trying pad template caps");
3044 if ((result = GST_PAD_TEMPLATE_CAPS (templ)))
3045 goto filter_done_unlock;
3049 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
3050 "non-fixed pad caps: trying pad caps");
3051 /* non fixed caps, try the negotiated caps */
3052 if ((result = get_pad_caps (pad)))
3053 goto filter_done_unlock;
3056 /* this almost never happens */
3057 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "pad has no caps");
3058 result = GST_CAPS_ANY;
3061 GST_OBJECT_UNLOCK (pad);
3063 /* run the filter on the result */
3065 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
3066 "using caps %p %" GST_PTR_FORMAT " with filter %p %"
3067 GST_PTR_FORMAT, result, result, filter, filter);
3068 result = gst_caps_intersect_full (filter, result, GST_CAPS_INTERSECT_FIRST);
3069 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "result %p %" GST_PTR_FORMAT,
3072 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
3073 "using caps %p %" GST_PTR_FORMAT, result, result);
3074 result = gst_caps_ref (result);
3076 gst_query_set_caps_result (query, result);
3077 gst_caps_unref (result);
3083 /* Default latency implementation */
3087 GstClockTime min, max;
3091 query_latency_default_fold (const GValue * item, GValue * ret,
3094 GstPad *pad = g_value_get_object (item), *peer;
3095 LatencyFoldData *fold_data = user_data;
3097 gboolean res = FALSE;
3099 query = gst_query_new_latency ();
3101 peer = gst_pad_get_peer (pad);
3103 res = gst_pad_peer_query (pad, query);
3105 GST_LOG_OBJECT (pad, "No peer pad found, ignoring this pad");
3110 GstClockTime min, max;
3112 gst_query_parse_latency (query, &live, &min, &max);
3114 GST_LOG_OBJECT (pad, "got latency live:%s min:%" G_GINT64_FORMAT
3115 " max:%" G_GINT64_FORMAT, live ? "true" : "false", min, max);
3118 if (min > fold_data->min)
3119 fold_data->min = min;
3121 if (fold_data->max == GST_CLOCK_TIME_NONE)
3122 fold_data->max = max;
3123 else if (max < fold_data->max)
3124 fold_data->max = max;
3126 fold_data->live = TRUE;
3129 GST_DEBUG_OBJECT (pad, "latency query failed");
3130 g_value_set_boolean (ret, FALSE);
3133 gst_query_unref (query);
3135 gst_object_unref (peer);
3141 gst_pad_query_latency_default (GstPad * pad, GstQuery * query)
3144 GstIteratorResult res;
3145 GValue ret = G_VALUE_INIT;
3147 LatencyFoldData fold_data;
3149 it = gst_pad_iterate_internal_links (pad);
3151 GST_DEBUG_OBJECT (pad, "Can't iterate internal links");
3155 g_value_init (&ret, G_TYPE_BOOLEAN);
3158 fold_data.live = FALSE;
3160 fold_data.max = GST_CLOCK_TIME_NONE;
3162 g_value_set_boolean (&ret, TRUE);
3163 res = gst_iterator_fold (it, query_latency_default_fold, &ret, &fold_data);
3165 case GST_ITERATOR_OK:
3166 g_assert_not_reached ();
3168 case GST_ITERATOR_DONE:
3170 case GST_ITERATOR_ERROR:
3171 g_value_set_boolean (&ret, FALSE);
3173 case GST_ITERATOR_RESYNC:
3174 gst_iterator_resync (it);
3177 g_assert_not_reached ();
3180 gst_iterator_free (it);
3182 query_ret = g_value_get_boolean (&ret);
3184 GST_LOG_OBJECT (pad, "got latency live:%s min:%" G_GINT64_FORMAT
3185 " max:%" G_GINT64_FORMAT, fold_data.live ? "true" : "false",
3186 fold_data.min, fold_data.max);
3188 if (fold_data.min > fold_data.max) {
3189 GST_ERROR_OBJECT (pad, "minimum latency bigger than maximum latency");
3192 gst_query_set_latency (query, fold_data.live, fold_data.min, fold_data.max);
3194 GST_LOG_OBJECT (pad, "latency query failed");
3204 gboolean dispatched;
3208 query_forward_func (GstPad * pad, QueryData * data)
3210 GST_LOG_OBJECT (pad, "query peer %p (%s) of %s:%s",
3211 data->query, GST_QUERY_TYPE_NAME (data->query), GST_DEBUG_PAD_NAME (pad));
3213 data->result |= gst_pad_peer_query (pad, data->query);
3215 data->dispatched = TRUE;
3217 /* stop on first successful reply */
3218 return data->result;
3222 * gst_pad_query_default:
3223 * @pad: a #GstPad to call the default query handler on.
3224 * @parent: (allow-none): the parent of @pad or %NULL
3225 * @query: (transfer none): the #GstQuery to handle.
3227 * Invokes the default query handler for the given pad.
3228 * The query is sent to all pads internally linked to @pad. Note that
3229 * if there are many possible sink pads that are internally linked to
3230 * @pad, only one will be sent the query.
3231 * Multi-sinkpad elements should implement custom query handlers.
3233 * Returns: %TRUE if the query was performed successfully.
3236 gst_pad_query_default (GstPad * pad, GstObject * parent, GstQuery * query)
3238 gboolean forward, ret = FALSE;
3240 switch (GST_QUERY_TYPE (query)) {
3241 case GST_QUERY_SCHEDULING:
3242 forward = GST_PAD_IS_PROXY_SCHEDULING (pad);
3244 case GST_QUERY_ALLOCATION:
3245 forward = GST_PAD_IS_PROXY_ALLOCATION (pad);
3247 case GST_QUERY_ACCEPT_CAPS:
3248 ret = gst_pad_query_accept_caps_default (pad, query);
3251 case GST_QUERY_CAPS:
3252 ret = gst_pad_query_caps_default (pad, query);
3255 case GST_QUERY_LATENCY:
3256 ret = gst_pad_query_latency_default (pad, query);
3259 case GST_QUERY_POSITION:
3260 case GST_QUERY_SEEKING:
3261 case GST_QUERY_FORMATS:
3262 case GST_QUERY_JITTER:
3263 case GST_QUERY_RATE:
3264 case GST_QUERY_CONVERT:
3270 GST_DEBUG_OBJECT (pad, "%sforwarding %p (%s) query", (forward ? "" : "not "),
3271 query, GST_QUERY_TYPE_NAME (query));
3277 data.dispatched = FALSE;
3278 data.result = FALSE;
3280 gst_pad_forward (pad, (GstPadForwardFunction) query_forward_func, &data);
3282 if (data.dispatched) {
3285 /* nothing dispatched, assume drained */
3286 if (GST_QUERY_TYPE (query) == GST_QUERY_DRAIN)
3296 probe_hook_marshal (GHook * hook, ProbeMarshall * data)
3298 GstPad *pad = data->pad;
3299 GstPadProbeInfo *info = data->info;
3300 GstPadProbeType type, flags;
3301 GstPadProbeCallback callback;
3302 GstPadProbeReturn ret;
3303 gpointer original_data;
3305 /* if we have called this callback, do nothing */
3306 if (PROBE_COOKIE (hook) == data->cookie) {
3307 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3308 "hook %lu, cookie %u already called", hook->hook_id,
3309 PROBE_COOKIE (hook));
3313 PROBE_COOKIE (hook) = data->cookie;
3315 flags = hook->flags >> G_HOOK_FLAG_USER_SHIFT;
3317 original_data = info->data;
3319 /* one of the data types for non-idle probes */
3320 if ((type & GST_PAD_PROBE_TYPE_IDLE) == 0
3321 && (flags & GST_PAD_PROBE_TYPE_ALL_BOTH & type) == 0)
3323 /* one of the scheduling types */
3324 if ((flags & GST_PAD_PROBE_TYPE_SCHEDULING & type) == 0)
3326 /* one of the blocking types must match */
3327 if ((type & GST_PAD_PROBE_TYPE_BLOCKING) &&
3328 (flags & GST_PAD_PROBE_TYPE_BLOCKING & type) == 0)
3330 if ((type & GST_PAD_PROBE_TYPE_BLOCKING) == 0 &&
3331 (flags & GST_PAD_PROBE_TYPE_BLOCKING))
3333 /* only probes that have GST_PAD_PROBE_TYPE_EVENT_FLUSH set */
3334 if ((type & GST_PAD_PROBE_TYPE_EVENT_FLUSH) &&
3335 (flags & GST_PAD_PROBE_TYPE_EVENT_FLUSH & type) == 0)
3338 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3339 "hook %lu, cookie %u with flags 0x%08x matches", hook->hook_id,
3340 PROBE_COOKIE (hook), flags);
3342 data->marshalled = TRUE;
3344 callback = (GstPadProbeCallback) hook->func;
3345 if (callback == NULL)
3348 info->id = hook->hook_id;
3350 GST_OBJECT_UNLOCK (pad);
3352 ret = callback (pad, info, hook->data);
3354 GST_OBJECT_LOCK (pad);
3356 if (original_data != NULL && info->data == NULL) {
3357 GST_DEBUG_OBJECT (pad, "data item in pad probe info was dropped");
3358 info->type = GST_PAD_PROBE_TYPE_INVALID;
3359 data->dropped = TRUE;
3363 case GST_PAD_PROBE_REMOVE:
3364 /* remove the probe */
3365 GST_DEBUG_OBJECT (pad, "asked to remove hook");
3366 cleanup_hook (pad, hook);
3368 case GST_PAD_PROBE_DROP:
3369 /* need to drop the data, make sure other probes don't get called
3371 GST_DEBUG_OBJECT (pad, "asked to drop item");
3372 info->type = GST_PAD_PROBE_TYPE_INVALID;
3373 data->dropped = TRUE;
3375 case GST_PAD_PROBE_HANDLED:
3376 GST_DEBUG_OBJECT (pad, "probe handled data");
3377 data->handled = TRUE;
3379 case GST_PAD_PROBE_PASS:
3380 /* inform the pad block to let things pass */
3381 GST_DEBUG_OBJECT (pad, "asked to pass item");
3384 case GST_PAD_PROBE_OK:
3385 GST_DEBUG_OBJECT (pad, "probe returned OK");
3388 GST_DEBUG_OBJECT (pad, "probe returned %d", ret);
3395 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3396 "hook %lu, cookie %u with flags 0x%08x does not match %08x",
3397 hook->hook_id, PROBE_COOKIE (hook), flags, info->type);
3402 /* a probe that does not take or return any data */
3403 #define PROBE_NO_DATA(pad,mask,label,defaultval) \
3405 if (G_UNLIKELY (pad->num_probes)) { \
3406 GstFlowReturn pval = defaultval; \
3407 /* pass NULL as the data item */ \
3408 GstPadProbeInfo info = { mask, 0, NULL, 0, 0 }; \
3409 info.ABI.abi.flow_ret = defaultval; \
3410 ret = do_probe_callbacks (pad, &info, defaultval); \
3411 if (G_UNLIKELY (ret != pval && ret != GST_FLOW_OK)) \
3416 #define PROBE_FULL(pad,mask,data,offs,size,label,handleable,handle_label) \
3418 if (G_UNLIKELY (pad->num_probes)) { \
3419 /* pass the data item */ \
3420 GstPadProbeInfo info = { mask, 0, data, offs, size }; \
3421 info.ABI.abi.flow_ret = GST_FLOW_OK; \
3422 ret = do_probe_callbacks (pad, &info, GST_FLOW_OK); \
3423 /* store the possibly updated data item */ \
3424 data = GST_PAD_PROBE_INFO_DATA (&info); \
3425 /* if something went wrong, exit */ \
3426 if (G_UNLIKELY (ret != GST_FLOW_OK)) { \
3427 if (handleable && ret == GST_FLOW_CUSTOM_SUCCESS_1) { \
3428 ret = info.ABI.abi.flow_ret; \
3429 goto handle_label; \
3436 #define PROBE_PUSH(pad,mask,data,label) \
3437 PROBE_FULL(pad, mask, data, -1, -1, label, FALSE, label);
3438 #define PROBE_HANDLE(pad,mask,data,label,handle_label) \
3439 PROBE_FULL(pad, mask, data, -1, -1, label, TRUE, handle_label);
3440 #define PROBE_PULL(pad,mask,data,offs,size,label) \
3441 PROBE_FULL(pad, mask, data, offs, size, label, FALSE, label);
3443 static GstFlowReturn
3444 do_pad_idle_probe_wait (GstPad * pad)
3446 while (GST_PAD_IS_RUNNING_IDLE_PROBE (pad)) {
3447 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3448 "waiting idle probe to be removed");
3449 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_BLOCKING);
3450 GST_PAD_BLOCK_WAIT (pad);
3451 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_BLOCKING);
3452 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "We got unblocked");
3454 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
3455 return GST_FLOW_FLUSHING;
3460 #define PROBE_TYPE_IS_SERIALIZED(i) \
3463 (((i)->type & (GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM | \
3464 GST_PAD_PROBE_TYPE_EVENT_FLUSH)) && \
3465 GST_EVENT_IS_SERIALIZED ((i)->data)) \
3467 (((i)->type & GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM) && \
3468 GST_QUERY_IS_SERIALIZED ((i)->data)) \
3470 ((i)->type & (GST_PAD_PROBE_TYPE_BUFFER | \
3471 GST_PAD_PROBE_TYPE_BUFFER_LIST)) \
3475 static GstFlowReturn
3476 do_probe_callbacks (GstPad * pad, GstPadProbeInfo * info,
3477 GstFlowReturn defaultval)
3486 data.handled = FALSE;
3487 data.marshalled = FALSE;
3488 data.dropped = FALSE;
3489 data.cookie = ++pad->priv->probe_cookie;
3492 (info->type & GST_PAD_PROBE_TYPE_BLOCK) == GST_PAD_PROBE_TYPE_BLOCK;
3494 if (is_block && PROBE_TYPE_IS_SERIALIZED (info)) {
3495 if (do_pad_idle_probe_wait (pad) == GST_FLOW_FLUSHING)
3500 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3501 "do probes cookie %u", data.cookie);
3502 cookie = pad->priv->probe_list_cookie;
3504 g_hook_list_marshal (&pad->probes, TRUE,
3505 (GHookMarshaller) probe_hook_marshal, &data);
3507 /* if the list changed, call the new callbacks (they will not have their
3508 * cookie set to data.cookie */
3509 if (cookie != pad->priv->probe_list_cookie) {
3510 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3511 "probe list changed, restarting");
3515 /* the first item that dropped will stop the hooks and then we drop here */
3519 /* If one handler took care of it, let the the item pass */
3524 /* if no handler matched and we are blocking, let the item pass */
3525 if (!data.marshalled && is_block)
3528 /* At this point, all handlers returned either OK or PASS. If one handler
3529 * returned PASS, let the item pass */
3534 while (GST_PAD_IS_BLOCKED (pad)) {
3535 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3536 "we are blocked %d times", pad->num_blocked);
3538 /* we might have released the lock */
3539 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
3542 /* now we block the streaming thread. It can be unlocked when we
3543 * deactivate the pad (which will also set the FLUSHING flag) or
3544 * when the pad is unblocked. A flushing event will also unblock
3545 * the pad after setting the FLUSHING flag. */
3546 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3547 "Waiting to be unblocked or set flushing");
3548 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_BLOCKING);
3549 GST_PAD_BLOCK_WAIT (pad);
3550 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_BLOCKING);
3551 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "We got unblocked");
3553 /* if the list changed, call the new callbacks (they will not have their
3554 * cookie set to data.cookie */
3555 if (cookie != pad->priv->probe_list_cookie) {
3556 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3557 "probe list changed, restarting");
3561 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
3571 GST_DEBUG_OBJECT (pad, "pad is flushing");
3572 return GST_FLOW_FLUSHING;
3576 GST_DEBUG_OBJECT (pad, "data is dropped");
3577 return GST_FLOW_CUSTOM_SUCCESS;
3581 /* FIXME : Should we return FLOW_OK or the defaultval ?? */
3582 GST_DEBUG_OBJECT (pad, "data is passed");
3587 GST_DEBUG_OBJECT (pad, "data was handled");
3588 return GST_FLOW_CUSTOM_SUCCESS_1;
3595 * gst_pad_get_offset:
3598 * Get the offset applied to the running time of @pad. @pad has to be a source
3601 * Returns: the offset.
3604 gst_pad_get_offset (GstPad * pad)
3608 g_return_val_if_fail (GST_IS_PAD (pad), 0);
3610 GST_OBJECT_LOCK (pad);
3611 result = pad->offset;
3612 GST_OBJECT_UNLOCK (pad);
3618 mark_event_not_received (GstPad * pad, PadEvent * ev, gpointer user_data)
3620 ev->received = FALSE;
3625 * gst_pad_set_offset:
3627 * @offset: the offset
3629 * Set the offset that will be applied to the running time of @pad.
3632 gst_pad_set_offset (GstPad * pad, gint64 offset)
3634 g_return_if_fail (GST_IS_PAD (pad));
3636 GST_OBJECT_LOCK (pad);
3637 /* if nothing changed, do nothing */
3638 if (pad->offset == offset)
3641 pad->offset = offset;
3642 GST_DEBUG_OBJECT (pad, "changed offset to %" G_GINT64_FORMAT, offset);
3644 /* resend all sticky events with updated offset on next buffer push */
3645 events_foreach (pad, mark_event_not_received, NULL);
3646 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3649 GST_OBJECT_UNLOCK (pad);
3656 /* If TRUE and ret is not OK this means
3657 * that pushing the EOS event failed
3661 /* If called for an event this is
3662 * the event that would be pushed
3663 * next. Don't forward sticky events
3664 * that would come after that */
3668 /* should be called with pad LOCK */
3670 push_sticky (GstPad * pad, PadEvent * ev, gpointer user_data)
3672 PushStickyData *data = user_data;
3673 GstEvent *event = ev->event;
3676 GST_DEBUG_OBJECT (pad, "event %s was already received",
3677 GST_EVENT_TYPE_NAME (event));
3681 /* If we're called because of an sticky event, only forward
3682 * events that would come before this new event and the
3684 if (data->event && GST_EVENT_IS_STICKY (data->event) &&
3685 GST_EVENT_TYPE (data->event) <= GST_EVENT_SEGMENT &&
3686 GST_EVENT_TYPE (data->event) < GST_EVENT_TYPE (event)) {
3687 data->ret = GST_FLOW_CUSTOM_SUCCESS_1;
3689 data->ret = gst_pad_push_event_unchecked (pad, gst_event_ref (event),
3690 GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM);
3693 switch (data->ret) {
3695 ev->received = TRUE;
3696 GST_DEBUG_OBJECT (pad, "event %s marked received",
3697 GST_EVENT_TYPE_NAME (event));
3699 case GST_FLOW_CUSTOM_SUCCESS:
3700 /* we can't assume the event is received when it was dropped */
3701 GST_DEBUG_OBJECT (pad, "event %s was dropped, mark pending",
3702 GST_EVENT_TYPE_NAME (event));
3703 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3704 data->ret = GST_FLOW_OK;
3706 case GST_FLOW_CUSTOM_SUCCESS_1:
3707 /* event was ignored and should be sent later */
3708 GST_DEBUG_OBJECT (pad, "event %s was ignored, mark pending",
3709 GST_EVENT_TYPE_NAME (event));
3710 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3711 data->ret = GST_FLOW_OK;
3713 case GST_FLOW_NOT_LINKED:
3714 /* not linked is not a problem, we are sticky so the event will be
3715 * sent later but only for non-EOS events */
3716 GST_DEBUG_OBJECT (pad, "pad was not linked, mark pending");
3717 if (GST_EVENT_TYPE (event) != GST_EVENT_EOS)
3718 data->ret = GST_FLOW_OK;
3719 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3722 GST_DEBUG_OBJECT (pad, "result %s, mark pending events",
3723 gst_flow_get_name (data->ret));
3724 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3728 if (data->ret != GST_FLOW_OK && GST_EVENT_TYPE (event) == GST_EVENT_EOS)
3729 data->was_eos = TRUE;
3731 return data->ret == GST_FLOW_OK;
3734 /* check sticky events and push them when needed. should be called
3736 static inline GstFlowReturn
3737 check_sticky (GstPad * pad, GstEvent * event)
3739 PushStickyData data = { GST_FLOW_OK, FALSE, event };
3741 if (G_UNLIKELY (GST_PAD_HAS_PENDING_EVENTS (pad))) {
3742 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3744 GST_DEBUG_OBJECT (pad, "pushing all sticky events");
3745 events_foreach (pad, push_sticky, &data);
3747 /* If there's an EOS event we must push it downstream
3748 * even if sending a previous sticky event failed.
3749 * Otherwise the pipeline might wait forever for EOS.
3751 * Only do this if pushing another event than the EOS
3754 if (data.ret != GST_FLOW_OK && !data.was_eos) {
3755 PadEvent *ev = find_event_by_type (pad, GST_EVENT_EOS, 0);
3757 if (ev && !ev->received) {
3758 data.ret = gst_pad_push_event_unchecked (pad, gst_event_ref (ev->event),
3759 GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM);
3760 /* the event could have been dropped. Because this can only
3761 * happen if the user asked for it, it's not an error */
3762 if (data.ret == GST_FLOW_CUSTOM_SUCCESS)
3763 data.ret = GST_FLOW_OK;
3773 * @pad: a #GstPad to invoke the default query on.
3774 * @query: (transfer none): the #GstQuery to perform.
3776 * Dispatches a query to a pad. The query should have been allocated by the
3777 * caller via one of the type-specific allocation functions. The element that
3778 * the pad belongs to is responsible for filling the query with an appropriate
3779 * response, which should then be parsed with a type-specific query parsing
3782 * Again, the caller is responsible for both the allocation and deallocation of
3783 * the query structure.
3785 * Please also note that some queries might need a running pipeline to work.
3787 * Returns: %TRUE if the query could be performed.
3790 gst_pad_query (GstPad * pad, GstQuery * query)
3793 gboolean res, serialized;
3794 GstPadQueryFunction func;
3795 GstPadProbeType type;
3798 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
3799 g_return_val_if_fail (GST_IS_QUERY (query), FALSE);
3801 if (GST_PAD_IS_SRC (pad)) {
3802 if (G_UNLIKELY (!GST_QUERY_IS_UPSTREAM (query)))
3803 goto wrong_direction;
3804 type = GST_PAD_PROBE_TYPE_QUERY_UPSTREAM;
3805 } else if (GST_PAD_IS_SINK (pad)) {
3806 if (G_UNLIKELY (!GST_QUERY_IS_DOWNSTREAM (query)))
3807 goto wrong_direction;
3808 type = GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM;
3810 goto unknown_direction;
3812 GST_DEBUG_OBJECT (pad, "doing query %p (%s)", query,
3813 GST_QUERY_TYPE_NAME (query));
3815 serialized = GST_QUERY_IS_SERIALIZED (query);
3816 if (G_UNLIKELY (serialized))
3817 GST_PAD_STREAM_LOCK (pad);
3819 GST_OBJECT_LOCK (pad);
3820 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH |
3821 GST_PAD_PROBE_TYPE_BLOCK, query, probe_stopped);
3822 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH, query, probe_stopped);
3824 ACQUIRE_PARENT (pad, parent, no_parent);
3825 GST_OBJECT_UNLOCK (pad);
3827 if ((func = GST_PAD_QUERYFUNC (pad)) == NULL)
3830 res = func (pad, parent, query);
3832 RELEASE_PARENT (parent);
3834 GST_DEBUG_OBJECT (pad, "sent query %p (%s), result %d", query,
3835 GST_QUERY_TYPE_NAME (query), res);
3840 GST_OBJECT_LOCK (pad);
3841 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PULL, query, probe_stopped);
3842 GST_OBJECT_UNLOCK (pad);
3844 if (G_UNLIKELY (serialized))
3845 GST_PAD_STREAM_UNLOCK (pad);
3852 g_warning ("pad %s:%s query %s in wrong direction",
3853 GST_DEBUG_PAD_NAME (pad), GST_QUERY_TYPE_NAME (query));
3858 g_warning ("pad %s:%s has invalid direction", GST_DEBUG_PAD_NAME (pad));
3863 GST_DEBUG_OBJECT (pad, "had no parent");
3864 GST_OBJECT_UNLOCK (pad);
3865 if (G_UNLIKELY (serialized))
3866 GST_PAD_STREAM_UNLOCK (pad);
3871 GST_DEBUG_OBJECT (pad, "had no query function");
3872 RELEASE_PARENT (parent);
3873 if (G_UNLIKELY (serialized))
3874 GST_PAD_STREAM_UNLOCK (pad);
3879 GST_DEBUG_OBJECT (pad, "query failed");
3880 if (G_UNLIKELY (serialized))
3881 GST_PAD_STREAM_UNLOCK (pad);
3886 GST_DEBUG_OBJECT (pad, "probe stopped: %s", gst_flow_get_name (ret));
3887 GST_OBJECT_UNLOCK (pad);
3888 if (G_UNLIKELY (serialized))
3889 GST_PAD_STREAM_UNLOCK (pad);
3891 /* if a probe dropped without handling, we don't sent it further but assume
3892 * that the probe did not answer the query and return FALSE */
3893 if (ret != GST_FLOW_CUSTOM_SUCCESS_1)
3903 * gst_pad_peer_query:
3904 * @pad: a #GstPad to invoke the peer query on.
3905 * @query: (transfer none): the #GstQuery to perform.
3907 * Performs gst_pad_query() on the peer of @pad.
3909 * The caller is responsible for both the allocation and deallocation of
3910 * the query structure.
3912 * Returns: %TRUE if the query could be performed. This function returns %FALSE
3913 * if @pad has no peer.
3916 gst_pad_peer_query (GstPad * pad, GstQuery * query)
3919 GstPadProbeType type;
3920 gboolean res, serialized;
3923 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
3924 g_return_val_if_fail (GST_IS_QUERY (query), FALSE);
3926 if (GST_PAD_IS_SRC (pad)) {
3927 if (G_UNLIKELY (!GST_QUERY_IS_DOWNSTREAM (query)))
3928 goto wrong_direction;
3929 type = GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM;
3930 } else if (GST_PAD_IS_SINK (pad)) {
3931 if (G_UNLIKELY (!GST_QUERY_IS_UPSTREAM (query)))
3932 goto wrong_direction;
3933 type = GST_PAD_PROBE_TYPE_QUERY_UPSTREAM;
3935 goto unknown_direction;
3937 GST_DEBUG_OBJECT (pad, "peer query %p (%s)", query,
3938 GST_QUERY_TYPE_NAME (query));
3940 serialized = GST_QUERY_IS_SERIALIZED (query);
3942 GST_OBJECT_LOCK (pad);
3943 if (GST_PAD_IS_SRC (pad) && serialized) {
3944 /* all serialized queries on the srcpad trigger push of
3946 if (check_sticky (pad, NULL) != GST_FLOW_OK)
3950 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH |
3951 GST_PAD_PROBE_TYPE_BLOCK, query, probe_stopped);
3952 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH, query, probe_stopped);
3954 peerpad = GST_PAD_PEER (pad);
3955 if (G_UNLIKELY (peerpad == NULL))
3958 gst_object_ref (peerpad);
3959 GST_OBJECT_UNLOCK (pad);
3961 res = gst_pad_query (peerpad, query);
3963 gst_object_unref (peerpad);
3968 GST_OBJECT_LOCK (pad);
3969 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PULL, query, probe_stopped);
3970 GST_OBJECT_UNLOCK (pad);
3977 g_warning ("pad %s:%s query %s in wrong direction",
3978 GST_DEBUG_PAD_NAME (pad), GST_QUERY_TYPE_NAME (query));
3983 g_warning ("pad %s:%s has invalid direction", GST_DEBUG_PAD_NAME (pad));
3988 GST_WARNING_OBJECT (pad, "could not send sticky events");
3989 GST_OBJECT_UNLOCK (pad);
3994 GST_INFO_OBJECT (pad, "pad has no peer");
3995 GST_OBJECT_UNLOCK (pad);
4000 GST_DEBUG_OBJECT (pad, "query failed");
4005 GST_DEBUG_OBJECT (pad, "probe stopped: %s", gst_flow_get_name (ret));
4006 GST_OBJECT_UNLOCK (pad);
4008 /* if a probe dropped without handling, we don't sent it further but
4009 * assume that the probe did not answer the query and return FALSE */
4010 if (ret != GST_FLOW_CUSTOM_SUCCESS_1)
4019 /**********************************************************************
4020 * Data passing functions
4023 /* this is the chain function that does not perform the additional argument
4024 * checking for that little extra speed.
4026 static inline GstFlowReturn
4027 gst_pad_chain_data_unchecked (GstPad * pad, GstPadProbeType type, void *data)
4031 gboolean handled = FALSE;
4033 GST_PAD_STREAM_LOCK (pad);
4035 GST_OBJECT_LOCK (pad);
4036 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
4039 if (G_UNLIKELY (GST_PAD_IS_EOS (pad)))
4042 if (G_UNLIKELY (GST_PAD_MODE (pad) != GST_PAD_MODE_PUSH))
4045 #ifndef G_DISABLE_ASSERT
4046 if (G_UNLIKELY (pad->priv->last_cookie != pad->priv->events_cookie)) {
4047 if (!find_event_by_type (pad, GST_EVENT_STREAM_START, 0)) {
4049 ":%s:<%s:%s> Got data flow before stream-start event",
4050 G_STRFUNC, GST_DEBUG_PAD_NAME (pad));
4052 if (!find_event_by_type (pad, GST_EVENT_SEGMENT, 0)) {
4054 ":%s:<%s:%s> Got data flow before segment event",
4055 G_STRFUNC, GST_DEBUG_PAD_NAME (pad));
4057 pad->priv->last_cookie = pad->priv->events_cookie;
4061 PROBE_HANDLE (pad, type | GST_PAD_PROBE_TYPE_BLOCK, data, probe_stopped,
4064 PROBE_HANDLE (pad, type, data, probe_stopped, probe_handled);
4066 ACQUIRE_PARENT (pad, parent, no_parent);
4067 GST_OBJECT_UNLOCK (pad);
4069 /* NOTE: we read the chainfunc unlocked.
4070 * we cannot hold the lock for the pad so we might send
4071 * the data to the wrong function. This is not really a
4072 * problem since functions are assigned at creation time
4073 * and don't change that often... */
4074 if (G_LIKELY (type & GST_PAD_PROBE_TYPE_BUFFER)) {
4075 GstPadChainFunction chainfunc;
4077 if (G_UNLIKELY ((chainfunc = GST_PAD_CHAINFUNC (pad)) == NULL))
4080 GST_CAT_DEBUG_OBJECT (GST_CAT_SCHEDULING, pad,
4081 "calling chainfunction &%s with buffer %" GST_PTR_FORMAT,
4082 GST_DEBUG_FUNCPTR_NAME (chainfunc), GST_BUFFER (data));
4084 ret = chainfunc (pad, parent, GST_BUFFER_CAST (data));
4086 GST_CAT_DEBUG_OBJECT (GST_CAT_SCHEDULING, pad,
4087 "called chainfunction &%s with buffer %p, returned %s",
4088 GST_DEBUG_FUNCPTR_NAME (chainfunc), data, gst_flow_get_name (ret));
4090 GstPadChainListFunction chainlistfunc;
4092 if (G_UNLIKELY ((chainlistfunc = GST_PAD_CHAINLISTFUNC (pad)) == NULL))
4095 GST_CAT_DEBUG_OBJECT (GST_CAT_SCHEDULING, pad,
4096 "calling chainlistfunction &%s",
4097 GST_DEBUG_FUNCPTR_NAME (chainlistfunc));
4099 ret = chainlistfunc (pad, parent, GST_BUFFER_LIST_CAST (data));
4101 GST_CAT_DEBUG_OBJECT (GST_CAT_SCHEDULING, pad,
4102 "called chainlistfunction &%s, returned %s",
4103 GST_DEBUG_FUNCPTR_NAME (chainlistfunc), gst_flow_get_name (ret));
4106 RELEASE_PARENT (parent);
4108 GST_PAD_STREAM_UNLOCK (pad);
4115 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4116 "chaining, but pad was flushing");
4117 GST_OBJECT_UNLOCK (pad);
4118 GST_PAD_STREAM_UNLOCK (pad);
4119 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4120 return GST_FLOW_FLUSHING;
4124 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "chaining, but pad was EOS");
4125 GST_OBJECT_UNLOCK (pad);
4126 GST_PAD_STREAM_UNLOCK (pad);
4127 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4128 return GST_FLOW_EOS;
4132 g_critical ("chain on pad %s:%s but it was not in push mode",
4133 GST_DEBUG_PAD_NAME (pad));
4134 GST_OBJECT_UNLOCK (pad);
4135 GST_PAD_STREAM_UNLOCK (pad);
4136 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4137 return GST_FLOW_ERROR;
4144 GST_OBJECT_UNLOCK (pad);
4145 GST_PAD_STREAM_UNLOCK (pad);
4146 /* We unref the buffer, except if the probe handled it (CUSTOM_SUCCESS_1) */
4148 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4151 case GST_FLOW_CUSTOM_SUCCESS:
4152 case GST_FLOW_CUSTOM_SUCCESS_1:
4153 GST_DEBUG_OBJECT (pad, "dropped or handled buffer");
4157 GST_DEBUG_OBJECT (pad, "an error occurred %s", gst_flow_get_name (ret));
4164 GST_DEBUG_OBJECT (pad, "No parent when chaining %" GST_PTR_FORMAT, data);
4165 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4166 GST_OBJECT_UNLOCK (pad);
4167 GST_PAD_STREAM_UNLOCK (pad);
4168 return GST_FLOW_FLUSHING;
4172 RELEASE_PARENT (parent);
4173 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4174 g_critical ("chain on pad %s:%s but it has no chainfunction",
4175 GST_DEBUG_PAD_NAME (pad));
4176 GST_PAD_STREAM_UNLOCK (pad);
4177 return GST_FLOW_NOT_SUPPORTED;
4183 * @pad: a sink #GstPad, returns GST_FLOW_ERROR if not.
4184 * @buffer: (transfer full): the #GstBuffer to send, return GST_FLOW_ERROR
4187 * Chain a buffer to @pad.
4189 * The function returns #GST_FLOW_FLUSHING if the pad was flushing.
4191 * If the buffer type is not acceptable for @pad (as negotiated with a
4192 * preceding GST_EVENT_CAPS event), this function returns
4193 * #GST_FLOW_NOT_NEGOTIATED.
4195 * The function proceeds calling the chain function installed on @pad (see
4196 * gst_pad_set_chain_function()) and the return value of that function is
4197 * returned to the caller. #GST_FLOW_NOT_SUPPORTED is returned if @pad has no
4200 * In all cases, success or failure, the caller loses its reference to @buffer
4201 * after calling this function.
4203 * Returns: a #GstFlowReturn from the pad.
4208 gst_pad_chain (GstPad * pad, GstBuffer * buffer)
4210 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4211 g_return_val_if_fail (GST_PAD_IS_SINK (pad), GST_FLOW_ERROR);
4212 g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR);
4214 return gst_pad_chain_data_unchecked (pad,
4215 GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_PUSH, buffer);
4218 static GstFlowReturn
4219 gst_pad_chain_list_default (GstPad * pad, GstObject * parent,
4220 GstBufferList * list)
4226 GST_INFO_OBJECT (pad, "chaining each buffer in list individually");
4228 len = gst_buffer_list_length (list);
4231 for (i = 0; i < len; i++) {
4232 buffer = gst_buffer_list_get (list, i);
4234 gst_pad_chain_data_unchecked (pad,
4235 GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_PUSH,
4236 gst_buffer_ref (buffer));
4237 if (ret != GST_FLOW_OK)
4240 gst_buffer_list_unref (list);
4246 * gst_pad_chain_list:
4247 * @pad: a sink #GstPad, returns GST_FLOW_ERROR if not.
4248 * @list: (transfer full): the #GstBufferList to send, return GST_FLOW_ERROR
4251 * Chain a bufferlist to @pad.
4253 * The function returns #GST_FLOW_FLUSHING if the pad was flushing.
4255 * If @pad was not negotiated properly with a CAPS event, this function
4256 * returns #GST_FLOW_NOT_NEGOTIATED.
4258 * The function proceeds calling the chainlist function installed on @pad (see
4259 * gst_pad_set_chain_list_function()) and the return value of that function is
4260 * returned to the caller. #GST_FLOW_NOT_SUPPORTED is returned if @pad has no
4261 * chainlist function.
4263 * In all cases, success or failure, the caller loses its reference to @list
4264 * after calling this function.
4268 * Returns: a #GstFlowReturn from the pad.
4271 gst_pad_chain_list (GstPad * pad, GstBufferList * list)
4273 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4274 g_return_val_if_fail (GST_PAD_IS_SINK (pad), GST_FLOW_ERROR);
4275 g_return_val_if_fail (GST_IS_BUFFER_LIST (list), GST_FLOW_ERROR);
4277 return gst_pad_chain_data_unchecked (pad,
4278 GST_PAD_PROBE_TYPE_BUFFER_LIST | GST_PAD_PROBE_TYPE_PUSH, list);
4281 static GstFlowReturn
4282 gst_pad_push_data (GstPad * pad, GstPadProbeType type, void *data)
4286 gboolean handled = FALSE;
4288 GST_OBJECT_LOCK (pad);
4289 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
4292 if (G_UNLIKELY (GST_PAD_IS_EOS (pad)))
4295 if (G_UNLIKELY (GST_PAD_MODE (pad) != GST_PAD_MODE_PUSH))
4298 #ifndef G_DISABLE_ASSERT
4299 if (G_UNLIKELY (pad->priv->last_cookie != pad->priv->events_cookie)) {
4300 if (!find_event_by_type (pad, GST_EVENT_STREAM_START, 0)) {
4302 ":%s:<%s:%s> Got data flow before stream-start event",
4303 G_STRFUNC, GST_DEBUG_PAD_NAME (pad));
4305 if (!find_event_by_type (pad, GST_EVENT_SEGMENT, 0)) {
4307 ":%s:<%s:%s> Got data flow before segment event",
4308 G_STRFUNC, GST_DEBUG_PAD_NAME (pad));
4310 pad->priv->last_cookie = pad->priv->events_cookie;
4314 if (G_UNLIKELY ((ret = check_sticky (pad, NULL))) != GST_FLOW_OK)
4317 /* do block probes */
4318 PROBE_HANDLE (pad, type | GST_PAD_PROBE_TYPE_BLOCK, data, probe_stopped,
4321 /* recheck sticky events because the probe might have cause a relink */
4322 if (G_UNLIKELY ((ret = check_sticky (pad, NULL))) != GST_FLOW_OK)
4325 /* do post-blocking probes */
4326 PROBE_HANDLE (pad, type, data, probe_stopped, probe_handled);
4328 if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL))
4331 /* take ref to peer pad before releasing the lock */
4332 gst_object_ref (peer);
4334 GST_OBJECT_UNLOCK (pad);
4336 ret = gst_pad_chain_data_unchecked (peer, type, data);
4339 gst_object_unref (peer);
4341 GST_OBJECT_LOCK (pad);
4342 pad->ABI.abi.last_flowret = ret;
4344 if (pad->priv->using == 0) {
4345 /* pad is not active anymore, trigger idle callbacks */
4346 PROBE_NO_DATA (pad, GST_PAD_PROBE_TYPE_PUSH | GST_PAD_PROBE_TYPE_IDLE,
4347 probe_stopped, ret);
4349 GST_OBJECT_UNLOCK (pad);
4353 /* ERROR recovery here */
4357 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4358 "pushing, but pad was flushing");
4359 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
4360 GST_OBJECT_UNLOCK (pad);
4361 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4362 return GST_FLOW_FLUSHING;
4366 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pushing, but pad was EOS");
4367 pad->ABI.abi.last_flowret = GST_FLOW_EOS;
4368 GST_OBJECT_UNLOCK (pad);
4369 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4370 return GST_FLOW_EOS;
4374 g_critical ("pushing on pad %s:%s but it was not activated in push mode",
4375 GST_DEBUG_PAD_NAME (pad));
4376 pad->ABI.abi.last_flowret = GST_FLOW_ERROR;
4377 GST_OBJECT_UNLOCK (pad);
4378 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4379 return GST_FLOW_ERROR;
4383 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4384 "error pushing events, return %s", gst_flow_get_name (ret));
4385 pad->ABI.abi.last_flowret = ret;
4386 GST_OBJECT_UNLOCK (pad);
4387 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4395 GST_OBJECT_UNLOCK (pad);
4396 if (data != NULL && !handled)
4397 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4400 case GST_FLOW_CUSTOM_SUCCESS:
4401 case GST_FLOW_CUSTOM_SUCCESS_1:
4402 GST_DEBUG_OBJECT (pad, "dropped or handled buffer");
4406 GST_DEBUG_OBJECT (pad, "an error occurred %s", gst_flow_get_name (ret));
4409 pad->ABI.abi.last_flowret = ret;
4414 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4415 "pushing, but it was not linked");
4416 pad->ABI.abi.last_flowret = GST_FLOW_NOT_LINKED;
4417 GST_OBJECT_UNLOCK (pad);
4418 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4419 return GST_FLOW_NOT_LINKED;
4425 * @pad: a source #GstPad, returns #GST_FLOW_ERROR if not.
4426 * @buffer: (transfer full): the #GstBuffer to push returns GST_FLOW_ERROR
4429 * Pushes a buffer to the peer of @pad.
4431 * This function will call installed block probes before triggering any
4432 * installed data probes.
4434 * The function proceeds calling gst_pad_chain() on the peer pad and returns
4435 * the value from that function. If @pad has no peer, #GST_FLOW_NOT_LINKED will
4438 * In all cases, success or failure, the caller loses its reference to @buffer
4439 * after calling this function.
4441 * Returns: a #GstFlowReturn from the peer pad.
4446 gst_pad_push (GstPad * pad, GstBuffer * buffer)
4448 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4449 g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR);
4450 g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR);
4452 return gst_pad_push_data (pad,
4453 GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_PUSH, buffer);
4457 * gst_pad_push_list:
4458 * @pad: a source #GstPad, returns #GST_FLOW_ERROR if not.
4459 * @list: (transfer full): the #GstBufferList to push returns GST_FLOW_ERROR
4462 * Pushes a buffer list to the peer of @pad.
4464 * This function will call installed block probes before triggering any
4465 * installed data probes.
4467 * The function proceeds calling the chain function on the peer pad and returns
4468 * the value from that function. If @pad has no peer, #GST_FLOW_NOT_LINKED will
4469 * be returned. If the peer pad does not have any installed chainlist function
4470 * every group buffer of the list will be merged into a normal #GstBuffer and
4471 * chained via gst_pad_chain().
4473 * In all cases, success or failure, the caller loses its reference to @list
4474 * after calling this function.
4476 * Returns: a #GstFlowReturn from the peer pad.
4481 gst_pad_push_list (GstPad * pad, GstBufferList * list)
4483 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4484 g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR);
4485 g_return_val_if_fail (GST_IS_BUFFER_LIST (list), GST_FLOW_ERROR);
4487 return gst_pad_push_data (pad,
4488 GST_PAD_PROBE_TYPE_BUFFER_LIST | GST_PAD_PROBE_TYPE_PUSH, list);
4491 static GstFlowReturn
4492 gst_pad_get_range_unchecked (GstPad * pad, guint64 offset, guint size,
4493 GstBuffer ** buffer)
4496 GstPadGetRangeFunction getrangefunc;
4500 GST_PAD_STREAM_LOCK (pad);
4502 GST_OBJECT_LOCK (pad);
4503 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
4506 if (G_UNLIKELY (GST_PAD_MODE (pad) != GST_PAD_MODE_PULL))
4509 if (G_UNLIKELY ((ret = check_sticky (pad, NULL))) != GST_FLOW_OK)
4514 /* when one of the probes returns DROPPED, probe_stopped will be called
4515 * and we skip calling the getrange function, res_buf should then contain a
4516 * valid result buffer */
4517 PROBE_PULL (pad, GST_PAD_PROBE_TYPE_PULL | GST_PAD_PROBE_TYPE_BLOCK,
4518 res_buf, offset, size, probe_stopped);
4520 /* recheck sticky events because the probe might have cause a relink */
4521 if (G_UNLIKELY ((ret = check_sticky (pad, NULL))) != GST_FLOW_OK)
4524 ACQUIRE_PARENT (pad, parent, no_parent);
4525 GST_OBJECT_UNLOCK (pad);
4527 if (G_UNLIKELY ((getrangefunc = GST_PAD_GETRANGEFUNC (pad)) == NULL))
4530 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4531 "calling getrangefunc %s, offset %"
4532 G_GUINT64_FORMAT ", size %u",
4533 GST_DEBUG_FUNCPTR_NAME (getrangefunc), offset, size);
4535 ret = getrangefunc (pad, parent, offset, size, &res_buf);
4537 RELEASE_PARENT (parent);
4539 GST_OBJECT_LOCK (pad);
4540 if (G_UNLIKELY (ret != GST_FLOW_OK))
4541 goto get_range_failed;
4543 /* can only fire the signal if we have a valid buffer */
4545 PROBE_PULL (pad, GST_PAD_PROBE_TYPE_PULL | GST_PAD_PROBE_TYPE_BUFFER,
4546 res_buf, offset, size, probe_stopped_unref);
4547 pad->ABI.abi.last_flowret = ret;
4548 GST_OBJECT_UNLOCK (pad);
4550 GST_PAD_STREAM_UNLOCK (pad);
4559 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4560 "getrange, but pad was flushing");
4561 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
4562 GST_OBJECT_UNLOCK (pad);
4563 GST_PAD_STREAM_UNLOCK (pad);
4564 return GST_FLOW_FLUSHING;
4568 g_critical ("getrange on pad %s:%s but it was not activated in pull mode",
4569 GST_DEBUG_PAD_NAME (pad));
4570 pad->ABI.abi.last_flowret = GST_FLOW_ERROR;
4571 GST_OBJECT_UNLOCK (pad);
4572 GST_PAD_STREAM_UNLOCK (pad);
4573 return GST_FLOW_ERROR;
4577 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "error pushing events");
4578 pad->ABI.abi.last_flowret = ret;
4579 GST_OBJECT_UNLOCK (pad);
4580 GST_PAD_STREAM_UNLOCK (pad);
4585 GST_DEBUG_OBJECT (pad, "no parent");
4586 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
4587 GST_OBJECT_UNLOCK (pad);
4588 GST_PAD_STREAM_UNLOCK (pad);
4589 return GST_FLOW_FLUSHING;
4593 g_critical ("getrange on pad %s:%s but it has no getrangefunction",
4594 GST_DEBUG_PAD_NAME (pad));
4595 RELEASE_PARENT (parent);
4596 GST_PAD_STREAM_UNLOCK (pad);
4597 return GST_FLOW_NOT_SUPPORTED;
4601 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4602 "probe returned %s", gst_flow_get_name (ret));
4603 if (ret == GST_FLOW_CUSTOM_SUCCESS) {
4605 /* the probe filled the buffer and asks us to not call the getrange
4606 * anymore, we continue with the post probes then. */
4607 GST_DEBUG_OBJECT (pad, "handled buffer");
4611 /* no buffer, we are EOS */
4612 GST_DEBUG_OBJECT (pad, "no buffer, return EOS");
4616 pad->ABI.abi.last_flowret = ret;
4617 GST_OBJECT_UNLOCK (pad);
4618 GST_PAD_STREAM_UNLOCK (pad);
4622 probe_stopped_unref:
4624 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4625 "probe returned %s", gst_flow_get_name (ret));
4626 /* if we drop here, it signals EOS */
4627 if (ret == GST_FLOW_CUSTOM_SUCCESS)
4629 pad->ABI.abi.last_flowret = ret;
4630 GST_OBJECT_UNLOCK (pad);
4631 GST_PAD_STREAM_UNLOCK (pad);
4632 if (*buffer == NULL)
4633 gst_buffer_unref (res_buf);
4638 pad->ABI.abi.last_flowret = ret;
4639 GST_OBJECT_UNLOCK (pad);
4640 GST_PAD_STREAM_UNLOCK (pad);
4641 GST_CAT_LEVEL_LOG (GST_CAT_SCHEDULING,
4642 (ret >= GST_FLOW_EOS) ? GST_LEVEL_INFO : GST_LEVEL_WARNING,
4643 pad, "getrange failed, flow: %s", gst_flow_get_name (ret));
4649 * gst_pad_get_range:
4650 * @pad: a src #GstPad, returns #GST_FLOW_ERROR if not.
4651 * @offset: The start offset of the buffer
4652 * @size: The length of the buffer
4653 * @buffer: (out callee-allocates): a pointer to hold the #GstBuffer,
4654 * returns #GST_FLOW_ERROR if %NULL.
4656 * When @pad is flushing this function returns #GST_FLOW_FLUSHING
4657 * immediately and @buffer is %NULL.
4659 * Calls the getrange function of @pad, see #GstPadGetRangeFunction for a
4660 * description of a getrange function. If @pad has no getrange function
4661 * installed (see gst_pad_set_getrange_function()) this function returns
4662 * #GST_FLOW_NOT_SUPPORTED.
4664 * If @buffer points to a variable holding %NULL, a valid new #GstBuffer will be
4665 * placed in @buffer when this function returns #GST_FLOW_OK. The new buffer
4666 * must be freed with gst_buffer_unref() after usage.
4668 * When @buffer points to a variable that points to a valid #GstBuffer, the
4669 * buffer will be filled with the result data when this function returns
4670 * #GST_FLOW_OK. If the provided buffer is larger than @size, only
4671 * @size bytes will be filled in the result buffer and its size will be updated
4674 * Note that less than @size bytes can be returned in @buffer when, for example,
4675 * an EOS condition is near or when @buffer is not large enough to hold @size
4676 * bytes. The caller should check the result buffer size to get the result size.
4678 * When this function returns any other result value than #GST_FLOW_OK, @buffer
4679 * will be unchanged.
4681 * This is a lowlevel function. Usually gst_pad_pull_range() is used.
4683 * Returns: a #GstFlowReturn from the pad.
4688 gst_pad_get_range (GstPad * pad, guint64 offset, guint size,
4689 GstBuffer ** buffer)
4691 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4692 g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR);
4693 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
4694 g_return_val_if_fail (*buffer == NULL || (GST_IS_BUFFER (*buffer)
4695 && gst_buffer_get_size (*buffer) >= size), GST_FLOW_ERROR);
4697 return gst_pad_get_range_unchecked (pad, offset, size, buffer);
4701 * gst_pad_pull_range:
4702 * @pad: a sink #GstPad, returns GST_FLOW_ERROR if not.
4703 * @offset: The start offset of the buffer
4704 * @size: The length of the buffer
4705 * @buffer: (out callee-allocates): a pointer to hold the #GstBuffer, returns
4706 * GST_FLOW_ERROR if %NULL.
4708 * Pulls a @buffer from the peer pad or fills up a provided buffer.
4710 * This function will first trigger the pad block signal if it was
4713 * When @pad is not linked #GST_FLOW_NOT_LINKED is returned else this
4714 * function returns the result of gst_pad_get_range() on the peer pad.
4715 * See gst_pad_get_range() for a list of return values and for the
4716 * semantics of the arguments of this function.
4718 * If @buffer points to a variable holding %NULL, a valid new #GstBuffer will be
4719 * placed in @buffer when this function returns #GST_FLOW_OK. The new buffer
4720 * must be freed with gst_buffer_unref() after usage. When this function
4721 * returns any other result value, @buffer will still point to %NULL.
4723 * When @buffer points to a variable that points to a valid #GstBuffer, the
4724 * buffer will be filled with the result data when this function returns
4725 * #GST_FLOW_OK. When this function returns any other result value,
4726 * @buffer will be unchanged. If the provided buffer is larger than @size, only
4727 * @size bytes will be filled in the result buffer and its size will be updated
4730 * Note that less than @size bytes can be returned in @buffer when, for example,
4731 * an EOS condition is near or when @buffer is not large enough to hold @size
4732 * bytes. The caller should check the result buffer size to get the result size.
4734 * Returns: a #GstFlowReturn from the peer pad.
4739 gst_pad_pull_range (GstPad * pad, guint64 offset, guint size,
4740 GstBuffer ** buffer)
4746 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4747 g_return_val_if_fail (GST_PAD_IS_SINK (pad), GST_FLOW_ERROR);
4748 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
4749 g_return_val_if_fail (*buffer == NULL || (GST_IS_BUFFER (*buffer)
4750 && gst_buffer_get_size (*buffer) >= size), GST_FLOW_ERROR);
4752 GST_OBJECT_LOCK (pad);
4753 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
4756 if (G_UNLIKELY (GST_PAD_MODE (pad) != GST_PAD_MODE_PULL))
4761 /* when one of the probes returns DROPPED, probe_stopped will be
4762 * called and we skip calling the peer getrange function. *buffer should then
4763 * contain a valid buffer */
4764 PROBE_PULL (pad, GST_PAD_PROBE_TYPE_PULL | GST_PAD_PROBE_TYPE_BLOCK,
4765 res_buf, offset, size, probe_stopped);
4767 if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL))
4770 gst_object_ref (peer);
4772 GST_OBJECT_UNLOCK (pad);
4774 ret = gst_pad_get_range_unchecked (peer, offset, size, &res_buf);
4776 gst_object_unref (peer);
4778 GST_OBJECT_LOCK (pad);
4780 pad->ABI.abi.last_flowret = ret;
4781 if (pad->priv->using == 0) {
4782 /* pad is not active anymore, trigger idle callbacks */
4783 PROBE_NO_DATA (pad, GST_PAD_PROBE_TYPE_PULL | GST_PAD_PROBE_TYPE_IDLE,
4784 probe_stopped_unref, ret);
4787 if (G_UNLIKELY (ret != GST_FLOW_OK))
4788 goto pull_range_failed;
4791 PROBE_PULL (pad, GST_PAD_PROBE_TYPE_PULL | GST_PAD_PROBE_TYPE_BUFFER,
4792 res_buf, offset, size, probe_stopped_unref);
4794 GST_OBJECT_UNLOCK (pad);
4800 /* ERROR recovery here */
4803 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4804 "pullrange, but pad was flushing");
4805 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
4806 GST_OBJECT_UNLOCK (pad);
4807 return GST_FLOW_FLUSHING;
4811 g_critical ("pullrange on pad %s:%s but it was not activated in pull mode",
4812 GST_DEBUG_PAD_NAME (pad));
4813 pad->ABI.abi.last_flowret = GST_FLOW_ERROR;
4814 GST_OBJECT_UNLOCK (pad);
4815 return GST_FLOW_ERROR;
4819 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pre probe returned %s",
4820 gst_flow_get_name (ret));
4821 if (ret == GST_FLOW_CUSTOM_SUCCESS) {
4823 /* the probe filled the buffer and asks us to not forward to the peer
4824 * anymore, we continue with the post probes then */
4825 GST_DEBUG_OBJECT (pad, "handled buffer");
4829 /* no buffer, we are EOS then */
4830 GST_DEBUG_OBJECT (pad, "no buffer, return EOS");
4834 pad->ABI.abi.last_flowret = ret;
4835 GST_OBJECT_UNLOCK (pad);
4840 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4841 "pulling range, but it was not linked");
4842 pad->ABI.abi.last_flowret = GST_FLOW_NOT_LINKED;
4843 GST_OBJECT_UNLOCK (pad);
4844 return GST_FLOW_NOT_LINKED;
4848 pad->ABI.abi.last_flowret = ret;
4849 GST_OBJECT_UNLOCK (pad);
4850 GST_CAT_LEVEL_LOG (GST_CAT_SCHEDULING,
4851 (ret >= GST_FLOW_EOS) ? GST_LEVEL_INFO : GST_LEVEL_WARNING,
4852 pad, "pullrange failed, flow: %s", gst_flow_get_name (ret));
4855 probe_stopped_unref:
4857 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4858 "post probe returned %s", gst_flow_get_name (ret));
4860 /* if we drop here, it signals EOS */
4861 if (ret == GST_FLOW_CUSTOM_SUCCESS)
4864 pad->ABI.abi.last_flowret = ret;
4865 GST_OBJECT_UNLOCK (pad);
4867 if (*buffer == NULL)
4868 gst_buffer_unref (res_buf);
4873 /* must be called with pad object lock */
4874 static GstFlowReturn
4875 store_sticky_event (GstPad * pad, GstEvent * event)
4880 gboolean res = FALSE;
4881 const gchar *name = NULL;
4882 gboolean insert = TRUE;
4884 type = GST_EVENT_TYPE (event);
4886 /* Store all sticky events except SEGMENT/EOS when we're flushing,
4887 * otherwise they can be dropped and nothing would ever resend them.
4888 * Only do that for activated pads though, everything else is a bug!
4890 if (G_UNLIKELY (GST_PAD_MODE (pad) == GST_PAD_MODE_NONE
4891 || (GST_PAD_IS_FLUSHING (pad) && (type == GST_EVENT_SEGMENT
4892 || type == GST_EVENT_EOS))))
4895 /* Unset the EOS flag when received STREAM_START event, so pad can
4896 * store sticky event and then push it later */
4897 if (type == GST_EVENT_STREAM_START) {
4898 GST_LOG_OBJECT (pad, "Removing pending EOS events");
4899 remove_event_by_type (pad, GST_EVENT_EOS);
4900 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_EOS);
4903 if (G_UNLIKELY (GST_PAD_IS_EOS (pad)))
4906 if (type & GST_EVENT_TYPE_STICKY_MULTI)
4907 name = gst_structure_get_name (gst_event_get_structure (event));
4909 events = pad->priv->events;
4912 for (i = 0; i < len; i++) {
4913 PadEvent *ev = &g_array_index (events, PadEvent, i);
4915 if (ev->event == NULL)
4918 if (type == GST_EVENT_TYPE (ev->event)) {
4919 /* matching types, check matching name if needed */
4920 if (name && !gst_event_has_name (ev->event, name))
4924 if ((res = gst_event_replace (&ev->event, event)))
4925 ev->received = FALSE;
4931 if (type < GST_EVENT_TYPE (ev->event) || (type != GST_EVENT_TYPE (ev->event)
4932 && GST_EVENT_TYPE (ev->event) == GST_EVENT_EOS)) {
4933 /* STREAM_START, CAPS and SEGMENT must be delivered in this order. By
4934 * storing the sticky ordered we can check that this is respected. */
4935 if (G_UNLIKELY (GST_EVENT_TYPE (ev->event) <= GST_EVENT_SEGMENT
4936 || GST_EVENT_TYPE (ev->event) == GST_EVENT_EOS))
4938 ":%s:<%s:%s> Sticky event misordering, got '%s' before '%s'",
4939 G_STRFUNC, GST_DEBUG_PAD_NAME (pad),
4940 gst_event_type_get_name (GST_EVENT_TYPE (ev->event)),
4941 gst_event_type_get_name (type));
4947 ev.event = gst_event_ref (event);
4948 ev.received = FALSE;
4949 g_array_insert_val (events, i, ev);
4954 pad->priv->events_cookie++;
4955 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
4957 GST_LOG_OBJECT (pad, "stored sticky event %s", GST_EVENT_TYPE_NAME (event));
4959 switch (GST_EVENT_TYPE (event)) {
4960 case GST_EVENT_CAPS:
4961 GST_OBJECT_UNLOCK (pad);
4963 GST_DEBUG_OBJECT (pad, "notify caps");
4964 g_object_notify_by_pspec ((GObject *) pad, pspec_caps);
4966 GST_OBJECT_LOCK (pad);
4972 if (type == GST_EVENT_EOS) {
4973 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_EOS);
4974 pad->ABI.abi.last_flowret = GST_FLOW_EOS;
4977 return GST_PAD_IS_FLUSHING (pad) ? GST_FLOW_FLUSHING : GST_FLOW_OK;
4982 GST_DEBUG_OBJECT (pad, "pad is flushing");
4983 return GST_FLOW_FLUSHING;
4987 GST_DEBUG_OBJECT (pad, "pad is EOS");
4988 return GST_FLOW_EOS;
4993 * gst_pad_store_sticky_event:
4995 * @event: a #GstEvent
4997 * Store the sticky @event on @pad
4999 * Returns: #GST_FLOW_OK on success, #GST_FLOW_FLUSHING when the pad
5000 * was flushing or #GST_FLOW_EOS when the pad was EOS.
5005 gst_pad_store_sticky_event (GstPad * pad, GstEvent * event)
5009 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
5010 g_return_val_if_fail (GST_IS_EVENT (event), FALSE);
5012 GST_OBJECT_LOCK (pad);
5013 ret = store_sticky_event (pad, event);
5014 GST_OBJECT_UNLOCK (pad);
5020 sticky_changed (GstPad * pad, PadEvent * ev, gpointer user_data)
5022 PushStickyData *data = user_data;
5024 /* Forward all sticky events before our current one that are pending */
5025 if (ev->event != data->event
5026 && GST_EVENT_TYPE (ev->event) < GST_EVENT_TYPE (data->event))
5027 return push_sticky (pad, ev, data);
5032 /* should be called with pad LOCK */
5033 static GstFlowReturn
5034 gst_pad_push_event_unchecked (GstPad * pad, GstEvent * event,
5035 GstPadProbeType type)
5039 GstEventType event_type;
5041 /* pass the adjusted event on. We need to do this even if
5042 * there is no peer pad because of the probes. */
5043 event = apply_pad_offset (pad, event, GST_PAD_IS_SINK (pad));
5045 /* Two checks to be made:
5046 * . (un)set the FLUSHING flag for flushing events,
5047 * . handle pad blocking */
5048 event_type = GST_EVENT_TYPE (event);
5049 switch (event_type) {
5050 case GST_EVENT_FLUSH_START:
5051 GST_PAD_SET_FLUSHING (pad);
5053 GST_PAD_BLOCK_BROADCAST (pad);
5054 type |= GST_PAD_PROBE_TYPE_EVENT_FLUSH;
5056 case GST_EVENT_FLUSH_STOP:
5057 if (G_UNLIKELY (!GST_PAD_IS_ACTIVE (pad)))
5060 GST_PAD_UNSET_FLUSHING (pad);
5062 /* Remove sticky EOS events */
5063 GST_LOG_OBJECT (pad, "Removing pending EOS events");
5064 remove_event_by_type (pad, GST_EVENT_EOS);
5065 remove_event_by_type (pad, GST_EVENT_SEGMENT);
5066 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_EOS);
5067 pad->ABI.abi.last_flowret = GST_FLOW_OK;
5069 type |= GST_PAD_PROBE_TYPE_EVENT_FLUSH;
5073 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
5076 /* No need to check for EOS here as either the caller (gst_pad_push_event())
5077 * checked already or this is called as part of pushing sticky events,
5078 * in which case we still want to forward the EOS event downstream.
5081 switch (GST_EVENT_TYPE (event)) {
5082 case GST_EVENT_RECONFIGURE:
5083 if (GST_PAD_IS_SINK (pad))
5084 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
5089 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH |
5090 GST_PAD_PROBE_TYPE_BLOCK, event, probe_stopped);
5095 /* send probes after modifying the events above */
5096 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH, event, probe_stopped);
5098 /* recheck sticky events because the probe might have cause a relink */
5099 if (GST_PAD_HAS_PENDING_EVENTS (pad) && GST_PAD_IS_SRC (pad)
5100 && (GST_EVENT_IS_SERIALIZED (event)
5101 || GST_EVENT_IS_STICKY (event))) {
5102 PushStickyData data = { GST_FLOW_OK, FALSE, event };
5103 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PENDING_EVENTS);
5105 /* Push all sticky events before our current one
5106 * that have changed */
5107 events_foreach (pad, sticky_changed, &data);
5110 /* now check the peer pad */
5111 peerpad = GST_PAD_PEER (pad);
5112 if (peerpad == NULL)
5115 gst_object_ref (peerpad);
5117 GST_OBJECT_UNLOCK (pad);
5119 GST_LOG_OBJECT (pad, "sending event %p (%s) to peerpad %" GST_PTR_FORMAT,
5120 event, gst_event_type_get_name (event_type), peerpad);
5122 ret = gst_pad_send_event_unchecked (peerpad, event, type);
5124 /* Note: we gave away ownership of the event at this point but we can still
5125 * print the old pointer */
5126 GST_LOG_OBJECT (pad,
5127 "sent event %p (%s) to peerpad %" GST_PTR_FORMAT ", ret %s", event,
5128 gst_event_type_get_name (event_type), peerpad, gst_flow_get_name (ret));
5130 gst_object_unref (peerpad);
5132 GST_OBJECT_LOCK (pad);
5134 if (pad->priv->using == 0) {
5135 /* pad is not active anymore, trigger idle callbacks */
5136 PROBE_NO_DATA (pad, GST_PAD_PROBE_TYPE_PUSH | GST_PAD_PROBE_TYPE_IDLE,
5137 idle_probe_stopped, ret);
5141 /* ERROR handling */
5144 GST_DEBUG_OBJECT (pad, "We're flushing");
5145 gst_event_unref (event);
5146 return GST_FLOW_FLUSHING;
5150 GST_DEBUG_OBJECT (pad, "flush-stop on inactive pad");
5151 gst_event_unref (event);
5152 return GST_FLOW_FLUSHING;
5156 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
5157 if (ret != GST_FLOW_CUSTOM_SUCCESS_1)
5158 gst_event_unref (event);
5161 case GST_FLOW_CUSTOM_SUCCESS_1:
5162 GST_DEBUG_OBJECT (pad, "handled event");
5164 case GST_FLOW_CUSTOM_SUCCESS:
5165 GST_DEBUG_OBJECT (pad, "dropped event");
5168 GST_DEBUG_OBJECT (pad, "an error occurred %s", gst_flow_get_name (ret));
5175 GST_DEBUG_OBJECT (pad, "Dropping event %s because pad is not linked",
5176 gst_event_type_get_name (GST_EVENT_TYPE (event)));
5177 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
5178 gst_event_unref (event);
5180 /* unlinked pads should not influence latency configuration */
5181 if (event_type == GST_EVENT_LATENCY)
5184 return GST_FLOW_NOT_LINKED;
5188 GST_DEBUG_OBJECT (pad, "Idle probe returned %s", gst_flow_get_name (ret));
5194 * gst_pad_push_event:
5195 * @pad: a #GstPad to push the event to.
5196 * @event: (transfer full): the #GstEvent to send to the pad.
5198 * Sends the event to the peer of the given pad. This function is
5199 * mainly used by elements to send events to their peer
5202 * This function takes ownership of the provided event so you should
5203 * gst_event_ref() it if you want to reuse the event after this call.
5205 * Returns: %TRUE if the event was handled.
5210 gst_pad_push_event (GstPad * pad, GstEvent * event)
5212 gboolean res = FALSE;
5213 GstPadProbeType type;
5214 gboolean sticky, serialized;
5216 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
5217 g_return_val_if_fail (GST_IS_EVENT (event), FALSE);
5219 if (GST_PAD_IS_SRC (pad)) {
5220 if (G_UNLIKELY (!GST_EVENT_IS_DOWNSTREAM (event)))
5221 goto wrong_direction;
5222 type = GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM;
5223 } else if (GST_PAD_IS_SINK (pad)) {
5224 if (G_UNLIKELY (!GST_EVENT_IS_UPSTREAM (event)))
5225 goto wrong_direction;
5226 /* events pushed on sinkpad never are sticky */
5227 type = GST_PAD_PROBE_TYPE_EVENT_UPSTREAM;
5229 goto unknown_direction;
5231 GST_OBJECT_LOCK (pad);
5232 sticky = GST_EVENT_IS_STICKY (event);
5233 serialized = GST_EVENT_IS_SERIALIZED (event);
5236 /* srcpad sticky events are stored immediately, the received flag is set
5237 * to FALSE and will be set to TRUE when we can successfully push the
5238 * event to the peer pad */
5239 switch (store_sticky_event (pad, event)) {
5240 case GST_FLOW_FLUSHING:
5248 if (GST_PAD_IS_SRC (pad) && (serialized || sticky)) {
5249 /* all serialized or sticky events on the srcpad trigger push of
5251 res = (check_sticky (pad, event) == GST_FLOW_OK);
5256 /* other events are pushed right away */
5257 ret = gst_pad_push_event_unchecked (pad, event, type);
5258 /* dropped events by a probe are not an error */
5259 res = (ret == GST_FLOW_OK || ret == GST_FLOW_CUSTOM_SUCCESS
5260 || ret == GST_FLOW_CUSTOM_SUCCESS_1);
5262 /* Errors in sticky event pushing are no problem and ignored here
5263 * as they will cause more meaningful errors during data flow.
5264 * For EOS events, that are not followed by data flow, we still
5265 * return FALSE here though.
5267 if (GST_EVENT_TYPE (event) != GST_EVENT_EOS)
5269 gst_event_unref (event);
5271 GST_OBJECT_UNLOCK (pad);
5275 /* ERROR handling */
5278 g_warning ("pad %s:%s pushing %s event in wrong direction",
5279 GST_DEBUG_PAD_NAME (pad), GST_EVENT_TYPE_NAME (event));
5280 gst_event_unref (event);
5285 g_warning ("pad %s:%s has invalid direction", GST_DEBUG_PAD_NAME (pad));
5286 gst_event_unref (event);
5291 GST_DEBUG_OBJECT (pad, "We're flushing");
5292 GST_OBJECT_UNLOCK (pad);
5293 gst_event_unref (event);
5298 GST_DEBUG_OBJECT (pad, "We're EOS");
5299 GST_OBJECT_UNLOCK (pad);
5300 gst_event_unref (event);
5305 /* Check if we can call the event function with the given event */
5306 static GstFlowReturn
5307 pre_eventfunc_check (GstPad * pad, GstEvent * event)
5311 switch (GST_EVENT_TYPE (event)) {
5312 case GST_EVENT_CAPS:
5314 /* backwards compatibility mode for caps */
5315 gst_event_parse_caps (event, &caps);
5317 if (!gst_pad_query_accept_caps (pad, caps))
5329 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
5330 "caps %" GST_PTR_FORMAT " not accepted", caps);
5331 return GST_FLOW_NOT_NEGOTIATED;
5335 static GstFlowReturn
5336 gst_pad_send_event_unchecked (GstPad * pad, GstEvent * event,
5337 GstPadProbeType type)
5340 GstEventType event_type;
5341 gboolean serialized, need_unlock = FALSE, sticky;
5342 GstPadEventFunction eventfunc;
5345 GST_OBJECT_LOCK (pad);
5347 event = apply_pad_offset (pad, event, GST_PAD_IS_SRC (pad));
5349 if (GST_PAD_IS_SINK (pad))
5350 serialized = GST_EVENT_IS_SERIALIZED (event);
5353 sticky = GST_EVENT_IS_STICKY (event);
5354 event_type = GST_EVENT_TYPE (event);
5355 switch (event_type) {
5356 case GST_EVENT_FLUSH_START:
5357 GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad,
5358 "have event type %d (FLUSH_START)", GST_EVENT_TYPE (event));
5360 /* can't even accept a flush begin event when flushing */
5361 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
5364 GST_PAD_SET_FLUSHING (pad);
5365 GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad, "set flush flag");
5367 case GST_EVENT_FLUSH_STOP:
5368 /* we can't accept flush-stop on inactive pads else the flushing flag
5369 * would be cleared and it would look like the pad can accept data.
5370 * Also, some elements restart a streaming thread in flush-stop which we
5371 * can't allow on inactive pads */
5372 if (G_UNLIKELY (!GST_PAD_IS_ACTIVE (pad)))
5375 GST_PAD_UNSET_FLUSHING (pad);
5376 GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad, "cleared flush flag");
5377 /* Remove pending EOS events */
5378 GST_LOG_OBJECT (pad, "Removing pending EOS and SEGMENT events");
5379 remove_event_by_type (pad, GST_EVENT_EOS);
5380 remove_event_by_type (pad, GST_EVENT_SEGMENT);
5381 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_EOS);
5382 pad->ABI.abi.last_flowret = GST_FLOW_OK;
5384 GST_OBJECT_UNLOCK (pad);
5385 /* grab stream lock */
5386 GST_PAD_STREAM_LOCK (pad);
5388 GST_OBJECT_LOCK (pad);
5389 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
5392 case GST_EVENT_RECONFIGURE:
5393 if (GST_PAD_IS_SRC (pad))
5394 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
5396 GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad,
5397 "have event type %" GST_PTR_FORMAT, event);
5399 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
5402 switch (event_type) {
5403 case GST_EVENT_STREAM_START:
5404 /* Remove sticky EOS events */
5405 GST_LOG_OBJECT (pad, "Removing pending EOS events");
5406 remove_event_by_type (pad, GST_EVENT_EOS);
5407 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_EOS);
5414 if (G_UNLIKELY (GST_PAD_IS_EOS (pad)))
5417 /* lock order: STREAM_LOCK, LOCK, recheck flushing. */
5418 GST_OBJECT_UNLOCK (pad);
5419 GST_PAD_STREAM_LOCK (pad);
5421 GST_OBJECT_LOCK (pad);
5422 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
5425 if (G_UNLIKELY (GST_PAD_IS_EOS (pad)))
5431 /* now do the probe */
5433 type | GST_PAD_PROBE_TYPE_PUSH |
5434 GST_PAD_PROBE_TYPE_BLOCK, event, probe_stopped);
5436 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH, event, probe_stopped);
5438 if (G_UNLIKELY ((eventfunc = GST_PAD_EVENTFUNC (pad)) == NULL))
5441 ACQUIRE_PARENT (pad, parent, no_parent);
5442 GST_OBJECT_UNLOCK (pad);
5444 ret = pre_eventfunc_check (pad, event);
5445 if (G_UNLIKELY (ret != GST_FLOW_OK))
5446 goto precheck_failed;
5449 gst_event_ref (event);
5451 if (eventfunc (pad, parent, event)) {
5454 /* something went wrong */
5455 switch (event_type) {
5456 case GST_EVENT_CAPS:
5457 ret = GST_FLOW_NOT_NEGOTIATED;
5460 ret = GST_FLOW_ERROR;
5464 RELEASE_PARENT (parent);
5466 GST_DEBUG_OBJECT (pad, "sent event, ret %s", gst_flow_get_name (ret));
5469 if (ret == GST_FLOW_OK) {
5470 GST_OBJECT_LOCK (pad);
5471 /* after the event function accepted the event, we can store the sticky
5472 * event on the pad */
5473 switch (store_sticky_event (pad, event)) {
5474 case GST_FLOW_FLUSHING:
5481 GST_OBJECT_UNLOCK (pad);
5483 gst_event_unref (event);
5487 GST_PAD_STREAM_UNLOCK (pad);
5491 /* ERROR handling */
5494 GST_OBJECT_UNLOCK (pad);
5496 GST_PAD_STREAM_UNLOCK (pad);
5497 GST_CAT_INFO_OBJECT (GST_CAT_EVENT, pad,
5498 "Received event on flushing pad. Discarding");
5499 gst_event_unref (event);
5500 return GST_FLOW_FLUSHING;
5504 GST_OBJECT_UNLOCK (pad);
5506 GST_PAD_STREAM_UNLOCK (pad);
5507 GST_CAT_INFO_OBJECT (GST_CAT_EVENT, pad,
5508 "Received flush-stop on inactive pad. Discarding");
5509 gst_event_unref (event);
5510 return GST_FLOW_FLUSHING;
5514 GST_OBJECT_UNLOCK (pad);
5516 GST_PAD_STREAM_UNLOCK (pad);
5517 GST_CAT_INFO_OBJECT (GST_CAT_EVENT, pad,
5518 "Received event on EOS pad. Discarding");
5519 gst_event_unref (event);
5520 return GST_FLOW_EOS;
5524 GST_OBJECT_UNLOCK (pad);
5526 GST_PAD_STREAM_UNLOCK (pad);
5527 /* Only unref if unhandled */
5528 if (ret != GST_FLOW_CUSTOM_SUCCESS_1)
5529 gst_event_unref (event);
5532 case GST_FLOW_CUSTOM_SUCCESS_1:
5533 case GST_FLOW_CUSTOM_SUCCESS:
5534 GST_DEBUG_OBJECT (pad, "dropped or handled event");
5538 GST_DEBUG_OBJECT (pad, "an error occurred %s", gst_flow_get_name (ret));
5545 g_warning ("pad %s:%s has no event handler, file a bug.",
5546 GST_DEBUG_PAD_NAME (pad));
5547 GST_OBJECT_UNLOCK (pad);
5549 GST_PAD_STREAM_UNLOCK (pad);
5550 gst_event_unref (event);
5551 return GST_FLOW_NOT_SUPPORTED;
5555 GST_DEBUG_OBJECT (pad, "no parent");
5556 GST_OBJECT_UNLOCK (pad);
5558 GST_PAD_STREAM_UNLOCK (pad);
5559 gst_event_unref (event);
5560 return GST_FLOW_FLUSHING;
5564 GST_DEBUG_OBJECT (pad, "pre event check failed");
5565 RELEASE_PARENT (parent);
5567 GST_PAD_STREAM_UNLOCK (pad);
5568 gst_event_unref (event);
5574 * gst_pad_send_event:
5575 * @pad: a #GstPad to send the event to.
5576 * @event: (transfer full): the #GstEvent to send to the pad.
5578 * Sends the event to the pad. This function can be used
5579 * by applications to send events in the pipeline.
5581 * If @pad is a source pad, @event should be an upstream event. If @pad is a
5582 * sink pad, @event should be a downstream event. For example, you would not
5583 * send a #GST_EVENT_EOS on a src pad; EOS events only propagate downstream.
5584 * Furthermore, some downstream events have to be serialized with data flow,
5585 * like EOS, while some can travel out-of-band, like #GST_EVENT_FLUSH_START. If
5586 * the event needs to be serialized with data flow, this function will take the
5587 * pad's stream lock while calling its event function.
5589 * To find out whether an event type is upstream, downstream, or downstream and
5590 * serialized, see #GstEventTypeFlags, gst_event_type_get_flags(),
5591 * #GST_EVENT_IS_UPSTREAM, #GST_EVENT_IS_DOWNSTREAM, and
5592 * #GST_EVENT_IS_SERIALIZED. Note that in practice that an application or
5593 * plugin doesn't need to bother itself with this information; the core handles
5594 * all necessary locks and checks.
5596 * This function takes ownership of the provided event so you should
5597 * gst_event_ref() it if you want to reuse the event after this call.
5599 * Returns: %TRUE if the event was handled.
5602 gst_pad_send_event (GstPad * pad, GstEvent * event)
5605 GstPadProbeType type;
5607 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
5608 g_return_val_if_fail (event != NULL, FALSE);
5610 if (GST_PAD_IS_SINK (pad)) {
5611 if (G_UNLIKELY (!GST_EVENT_IS_DOWNSTREAM (event)))
5612 goto wrong_direction;
5613 type = GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM;
5614 } else if (GST_PAD_IS_SRC (pad)) {
5615 if (G_UNLIKELY (!GST_EVENT_IS_UPSTREAM (event)))
5616 goto wrong_direction;
5617 type = GST_PAD_PROBE_TYPE_EVENT_UPSTREAM;
5619 goto unknown_direction;
5621 if (gst_pad_send_event_unchecked (pad, event, type) != GST_FLOW_OK)
5628 /* ERROR handling */
5631 g_warning ("pad %s:%s sending %s event in wrong direction",
5632 GST_DEBUG_PAD_NAME (pad), GST_EVENT_TYPE_NAME (event));
5633 gst_event_unref (event);
5638 g_warning ("pad %s:%s has invalid direction", GST_DEBUG_PAD_NAME (pad));
5639 gst_event_unref (event);
5645 * gst_pad_set_element_private:
5646 * @pad: the #GstPad to set the private data of.
5647 * @priv: The private data to attach to the pad.
5649 * Set the given private data gpointer on the pad.
5650 * This function can only be used by the element that owns the pad.
5651 * No locking is performed in this function.
5654 gst_pad_set_element_private (GstPad * pad, gpointer priv)
5656 pad->element_private = priv;
5660 * gst_pad_get_element_private:
5661 * @pad: the #GstPad to get the private data of.
5663 * Gets the private data of a pad.
5664 * No locking is performed in this function.
5666 * Returns: (transfer none): a #gpointer to the private data.
5669 gst_pad_get_element_private (GstPad * pad)
5671 return pad->element_private;
5675 * gst_pad_get_sticky_event:
5676 * @pad: the #GstPad to get the event from.
5677 * @event_type: the #GstEventType that should be retrieved.
5678 * @idx: the index of the event
5680 * Returns a new reference of the sticky event of type @event_type
5683 * Returns: (transfer full) (nullable): a #GstEvent of type
5684 * @event_type or %NULL when no event of @event_type was on
5685 * @pad. Unref after usage.
5688 gst_pad_get_sticky_event (GstPad * pad, GstEventType event_type, guint idx)
5690 GstEvent *event = NULL;
5693 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
5694 g_return_val_if_fail ((event_type & GST_EVENT_TYPE_STICKY) != 0, NULL);
5696 GST_OBJECT_LOCK (pad);
5697 ev = find_event_by_type (pad, event_type, idx);
5698 if (ev && (event = ev->event))
5699 gst_event_ref (event);
5700 GST_OBJECT_UNLOCK (pad);
5707 GstPadStickyEventsForeachFunction func;
5712 foreach_dispatch_function (GstPad * pad, PadEvent * ev, gpointer user_data)
5714 ForeachDispatch *data = user_data;
5715 gboolean ret = TRUE;
5718 GST_OBJECT_UNLOCK (pad);
5720 ret = data->func (pad, &ev->event, data->user_data);
5722 GST_OBJECT_LOCK (pad);
5729 * gst_pad_sticky_events_foreach:
5730 * @pad: the #GstPad that should be used for iteration.
5731 * @foreach_func: (scope call): the #GstPadStickyEventsForeachFunction that
5732 * should be called for every event.
5733 * @user_data: (closure): the optional user data.
5735 * Iterates all sticky events on @pad and calls @foreach_func for every
5736 * event. If @foreach_func returns %FALSE the iteration is immediately stopped.
5739 gst_pad_sticky_events_foreach (GstPad * pad,
5740 GstPadStickyEventsForeachFunction foreach_func, gpointer user_data)
5742 ForeachDispatch data;
5744 g_return_if_fail (GST_IS_PAD (pad));
5745 g_return_if_fail (foreach_func != NULL);
5747 data.func = foreach_func;
5748 data.user_data = user_data;
5750 GST_OBJECT_LOCK (pad);
5751 events_foreach (pad, foreach_dispatch_function, &data);
5752 GST_OBJECT_UNLOCK (pad);
5756 do_stream_status (GstPad * pad, GstStreamStatusType type,
5757 GThread * thread, GstTask * task)
5761 GST_DEBUG_OBJECT (pad, "doing stream-status %d", type);
5763 if ((parent = GST_ELEMENT_CAST (gst_pad_get_parent (pad)))) {
5764 if (GST_IS_ELEMENT (parent)) {
5765 GstMessage *message;
5766 GValue value = { 0 };
5768 if (type == GST_STREAM_STATUS_TYPE_ENTER) {
5769 gchar *tname, *ename, *pname;
5771 /* create a good task name */
5772 ename = gst_element_get_name (parent);
5773 pname = gst_pad_get_name (pad);
5774 tname = g_strdup_printf ("%s:%s", ename, pname);
5778 gst_object_set_name (GST_OBJECT_CAST (task), tname);
5782 message = gst_message_new_stream_status (GST_OBJECT_CAST (pad),
5785 g_value_init (&value, GST_TYPE_TASK);
5786 g_value_set_object (&value, task);
5787 gst_message_set_stream_status_object (message, &value);
5788 g_value_unset (&value);
5790 GST_DEBUG_OBJECT (pad, "posting stream-status %d", type);
5791 gst_element_post_message (parent, message);
5793 gst_object_unref (parent);
5798 pad_enter_thread (GstTask * task, GThread * thread, gpointer user_data)
5800 do_stream_status (GST_PAD_CAST (user_data), GST_STREAM_STATUS_TYPE_ENTER,
5805 pad_leave_thread (GstTask * task, GThread * thread, gpointer user_data)
5807 do_stream_status (GST_PAD_CAST (user_data), GST_STREAM_STATUS_TYPE_LEAVE,
5812 * gst_pad_start_task:
5813 * @pad: the #GstPad to start the task of
5814 * @func: the task function to call
5815 * @user_data: user data passed to the task function
5816 * @notify: called when @user_data is no longer referenced
5818 * Starts a task that repeatedly calls @func with @user_data. This function
5819 * is mostly used in pad activation functions to start the dataflow.
5820 * The #GST_PAD_STREAM_LOCK of @pad will automatically be acquired
5821 * before @func is called.
5823 * Returns: a %TRUE if the task could be started.
5826 gst_pad_start_task (GstPad * pad, GstTaskFunction func, gpointer user_data,
5827 GDestroyNotify notify)
5832 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
5833 g_return_val_if_fail (func != NULL, FALSE);
5835 GST_DEBUG_OBJECT (pad, "start task");
5837 GST_OBJECT_LOCK (pad);
5838 task = GST_PAD_TASK (pad);
5840 task = gst_task_new (func, user_data, notify);
5841 gst_task_set_lock (task, GST_PAD_GET_STREAM_LOCK (pad));
5842 gst_task_set_enter_callback (task, pad_enter_thread, pad, NULL);
5843 gst_task_set_leave_callback (task, pad_leave_thread, pad, NULL);
5844 GST_INFO_OBJECT (pad, "created task %p", task);
5845 GST_PAD_TASK (pad) = task;
5846 gst_object_ref (task);
5847 /* release lock to post the message */
5848 GST_OBJECT_UNLOCK (pad);
5850 do_stream_status (pad, GST_STREAM_STATUS_TYPE_CREATE, NULL, task);
5852 gst_object_unref (task);
5854 GST_OBJECT_LOCK (pad);
5855 /* nobody else is supposed to have changed the pad now */
5856 if (GST_PAD_TASK (pad) != task)
5857 goto concurrent_stop;
5859 res = gst_task_set_state (task, GST_TASK_STARTED);
5860 GST_OBJECT_UNLOCK (pad);
5867 GST_OBJECT_UNLOCK (pad);
5873 * gst_pad_pause_task:
5874 * @pad: the #GstPad to pause the task of
5876 * Pause the task of @pad. This function will also wait until the
5877 * function executed by the task is finished if this function is not
5878 * called from the task function.
5880 * Returns: a %TRUE if the task could be paused or %FALSE when the pad
5884 gst_pad_pause_task (GstPad * pad)
5889 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
5891 GST_DEBUG_OBJECT (pad, "pause task");
5893 GST_OBJECT_LOCK (pad);
5894 task = GST_PAD_TASK (pad);
5897 res = gst_task_set_state (task, GST_TASK_PAUSED);
5898 GST_OBJECT_UNLOCK (pad);
5900 /* wait for task function to finish, this lock is recursive so it does nothing
5901 * when the pause is called from the task itself */
5902 GST_PAD_STREAM_LOCK (pad);
5903 GST_PAD_STREAM_UNLOCK (pad);
5909 GST_DEBUG_OBJECT (pad, "pad has no task");
5910 GST_OBJECT_UNLOCK (pad);
5916 * gst_pad_stop_task:
5917 * @pad: the #GstPad to stop the task of
5919 * Stop the task of @pad. This function will also make sure that the
5920 * function executed by the task will effectively stop if not called
5921 * from the GstTaskFunction.
5923 * This function will deadlock if called from the GstTaskFunction of
5924 * the task. Use gst_task_pause() instead.
5926 * Regardless of whether the pad has a task, the stream lock is acquired and
5927 * released so as to ensure that streaming through this pad has finished.
5929 * Returns: a %TRUE if the task could be stopped or %FALSE on error.
5932 gst_pad_stop_task (GstPad * pad)
5937 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
5939 GST_DEBUG_OBJECT (pad, "stop task");
5941 GST_OBJECT_LOCK (pad);
5942 task = GST_PAD_TASK (pad);
5945 GST_PAD_TASK (pad) = NULL;
5946 res = gst_task_set_state (task, GST_TASK_STOPPED);
5947 GST_OBJECT_UNLOCK (pad);
5949 GST_PAD_STREAM_LOCK (pad);
5950 GST_PAD_STREAM_UNLOCK (pad);
5952 if (!gst_task_join (task))
5955 gst_object_unref (task);
5961 GST_DEBUG_OBJECT (pad, "no task");
5962 GST_OBJECT_UNLOCK (pad);
5964 GST_PAD_STREAM_LOCK (pad);
5965 GST_PAD_STREAM_UNLOCK (pad);
5967 /* this is not an error */
5972 /* this is bad, possibly the application tried to join the task from
5973 * the task's thread. We install the task again so that it will be stopped
5974 * again from the right thread next time hopefully. */
5975 GST_OBJECT_LOCK (pad);
5976 GST_DEBUG_OBJECT (pad, "join failed");
5977 /* we can only install this task if there was no other task */
5978 if (GST_PAD_TASK (pad) == NULL)
5979 GST_PAD_TASK (pad) = task;
5980 GST_OBJECT_UNLOCK (pad);
5987 * gst_pad_probe_info_get_event:
5988 * @info: a #GstPadProbeInfo
5990 * Returns: (transfer none): The #GstEvent from the probe
5994 gst_pad_probe_info_get_event (GstPadProbeInfo * info)
5996 g_return_val_if_fail (info->type & (GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM |
5997 GST_PAD_PROBE_TYPE_EVENT_UPSTREAM), NULL);
5999 return GST_PAD_PROBE_INFO_EVENT (info);
6004 * gst_pad_probe_info_get_query:
6005 * @info: a #GstPadProbeInfo
6007 * Returns: (transfer none): The #GstQuery from the probe
6011 gst_pad_probe_info_get_query (GstPadProbeInfo * info)
6013 g_return_val_if_fail (info->type & (GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM |
6014 GST_PAD_PROBE_TYPE_QUERY_UPSTREAM), NULL);
6016 return GST_PAD_PROBE_INFO_QUERY (info);
6020 * gst_pad_probe_info_get_buffer:
6021 * @info: a #GstPadProbeInfo
6023 * Returns: (transfer none): The #GstBuffer from the probe
6027 gst_pad_probe_info_get_buffer (GstPadProbeInfo * info)
6029 g_return_val_if_fail (info->type & GST_PAD_PROBE_TYPE_BUFFER, NULL);
6031 return GST_PAD_PROBE_INFO_BUFFER (info);
6035 * gst_pad_probe_info_get_bufferlist:
6036 * @info: a #GstPadProbeInfo
6038 * Returns: (transfer none): The #GstBufferlist from the probe
6042 gst_pad_probe_info_get_buffer_list (GstPadProbeInfo * info)
6044 g_return_val_if_fail (info->type & GST_PAD_PROBE_TYPE_BUFFER_LIST, NULL);
6046 return GST_PAD_PROBE_INFO_BUFFER_LIST (info);
6050 * gst_pad_get_last_flow_return:
6053 * Gets the #GstFlowReturn return from the last data passed by this pad.
6058 gst_pad_get_last_flow_return (GstPad * pad)
6062 GST_OBJECT_LOCK (pad);
6063 ret = GST_PAD_LAST_FLOW_RETURN (pad);
6064 GST_OBJECT_UNLOCK (pad);