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.
25 * @short_description: Object contained by elements that allows links to
27 * @see_also: #GstPadTemplate, #GstElement, #GstEvent, #GstQuery, #GstBuffer
29 * A #GstElement is linked to other elements via "pads", which are extremely
30 * light-weight generic link points.
32 * Pads have a #GstPadDirection, source pads produce data, sink pads consume
35 * Pads are typically created from a #GstPadTemplate with
36 * gst_pad_new_from_template() and are then added to a #GstElement. This usually
37 * happens when the element is created but it can also happen dynamically based
38 * on the data that the element is processing or based on the pads that the
39 * application requests.
41 * Pads without pad templates can be created with gst_pad_new(),
42 * which takes a direction and a name as an argument. If the name is %NULL,
43 * then a guaranteed unique name will be assigned to it.
45 * A #GstElement creating a pad will typically use the various
46 * gst_pad_set_*_function() calls to register callbacks for events, queries or
47 * dataflow on the pads.
49 * gst_pad_get_parent() will retrieve the #GstElement that owns the pad.
51 * After two pads are retrieved from an element by gst_element_get_static_pad(),
52 * the pads can be linked with gst_pad_link(). (For quick links,
53 * you can also use gst_element_link(), which will make the obvious
54 * link for you if it's straightforward.). Pads can be unlinked again with
55 * gst_pad_unlink(). gst_pad_get_peer() can be used to check what the pad is
58 * Before dataflow is possible on the pads, they need to be activated with
59 * gst_pad_set_active().
61 * gst_pad_query() and gst_pad_peer_query() can be used to query various
62 * properties of the pad and the stream.
64 * To send a #GstEvent on a pad, use gst_pad_send_event() and
65 * gst_pad_push_event(). Some events will be sticky on the pad, meaning that
66 * after they pass on the pad they can be queried later with
67 * gst_pad_get_sticky_event() and gst_pad_sticky_events_foreach().
68 * gst_pad_get_current_caps() and gst_pad_has_current_caps() are convenience
69 * functions to query the current sticky CAPS event on a pad.
71 * GstElements will use gst_pad_push() and gst_pad_pull_range() to push out
72 * or pull in a buffer.
74 * The dataflow, events and queries that happen on a pad can be monitored with
75 * probes that can be installed with gst_pad_add_probe(). gst_pad_is_blocked()
76 * can be used to check if a block probe is installed on the pad.
77 * gst_pad_is_blocking() checks if the blocking probe is currently blocking the
78 * pad. gst_pad_remove_probe() is used to remove a previously installed probe
79 * and unblock blocking probes if any.
81 * Pad have an offset that can be retrieved with gst_pad_get_offset(). This
82 * offset will be applied to the running_time of all data passing over the pad.
83 * gst_pad_set_offset() can be used to change the offset.
85 * Convenience functions exist to start, pause and stop the task on a pad with
86 * gst_pad_start_task(), gst_pad_pause_task() and gst_pad_stop_task()
90 #include "gst_private.h"
93 #include "gstpadtemplate.h"
94 #include "gstenumtypes.h"
98 #include "gsttracerutils.h"
100 #include "glib-compat-private.h"
102 GST_DEBUG_CATEGORY_STATIC (debug_dataflow);
103 #define GST_CAT_DEFAULT GST_CAT_PADS
105 /* Pad signals and args */
124 #define _PAD_PROBE_TYPE_ALL_BOTH_AND_FLUSH (GST_PAD_PROBE_TYPE_ALL_BOTH | GST_PAD_PROBE_TYPE_EVENT_FLUSH)
126 /* we have a pending and an active event on the pad. On source pads only the
127 * active event is used. On sinkpads, events are copied to the pending entry and
128 * moved to the active event when the eventfunc returned %TRUE. */
135 struct _GstPadPrivate
142 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 */
149 /* conditional and variable used to ensure pads only get (de)activated
150 * by a single thread at a time. Protected by the object lock */
151 GCond activation_cond;
152 gboolean in_activation;
160 #define GST_PAD_IS_RUNNING_IDLE_PROBE(p) \
161 (((GstPad *)(p))->priv->idle_running > 0)
166 GstPadProbeInfo *info;
172 GHook **called_probes;
173 guint n_called_probes;
174 guint called_probes_size;
178 static void gst_pad_dispose (GObject * object);
179 static void gst_pad_finalize (GObject * object);
180 static void gst_pad_set_property (GObject * object, guint prop_id,
181 const GValue * value, GParamSpec * pspec);
182 static void gst_pad_get_property (GObject * object, guint prop_id,
183 GValue * value, GParamSpec * pspec);
185 static void gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ);
186 static gboolean gst_pad_activate_default (GstPad * pad, GstObject * parent);
187 static GstFlowReturn gst_pad_chain_list_default (GstPad * pad,
188 GstObject * parent, GstBufferList * list);
190 static GstFlowReturn gst_pad_send_event_unchecked (GstPad * pad,
191 GstEvent * event, GstPadProbeType type);
192 static GstFlowReturn gst_pad_push_event_unchecked (GstPad * pad,
193 GstEvent ** event, GstPadProbeType type);
195 static gboolean activate_mode_internal (GstPad * pad, GstObject * parent,
196 GstPadMode mode, gboolean active);
198 static guint gst_pad_signals[LAST_SIGNAL] = { 0 };
200 static GParamSpec *pspec_caps = NULL;
202 /* quarks for probe signals */
203 static GQuark buffer_quark;
204 static GQuark buffer_list_quark;
205 static GQuark event_quark;
214 static GstFlowQuarks flow_quarks[] = {
215 {GST_FLOW_CUSTOM_SUCCESS, "custom-success", 0},
216 {GST_FLOW_OK, "ok", 0},
217 {GST_FLOW_NOT_LINKED, "not-linked", 0},
218 {GST_FLOW_FLUSHING, "flushing", 0},
219 {GST_FLOW_EOS, "eos", 0},
220 {GST_FLOW_NOT_NEGOTIATED, "not-negotiated", 0},
221 {GST_FLOW_ERROR, "error", 0},
222 {GST_FLOW_NOT_SUPPORTED, "not-supported", 0},
223 {GST_FLOW_CUSTOM_ERROR, "custom-error", 0}
228 * @ret: a #GstFlowReturn to get the name of.
230 * Gets a string representing the given flow return.
232 * Returns: a static string with the name of the flow return.
235 gst_flow_get_name (GstFlowReturn ret)
239 ret = CLAMP (ret, GST_FLOW_CUSTOM_ERROR, GST_FLOW_CUSTOM_SUCCESS);
241 for (i = 0; i < G_N_ELEMENTS (flow_quarks); i++) {
242 if (ret == flow_quarks[i].ret)
243 return flow_quarks[i].name;
250 * @ret: a #GstFlowReturn to get the quark of.
252 * Get the unique quark for the given GstFlowReturn.
254 * Returns: the quark associated with the flow return or 0 if an
255 * invalid return was specified.
258 gst_flow_to_quark (GstFlowReturn ret)
262 ret = CLAMP (ret, GST_FLOW_CUSTOM_ERROR, GST_FLOW_CUSTOM_SUCCESS);
264 for (i = 0; i < G_N_ELEMENTS (flow_quarks); i++) {
265 if (ret == flow_quarks[i].ret)
266 return flow_quarks[i].quark;
272 * gst_pad_link_get_name:
273 * @ret: a #GstPadLinkReturn to get the name of.
275 * Gets a string representing the given pad-link return.
277 * Returns: a static string with the name of the pad-link return.
282 gst_pad_link_get_name (GstPadLinkReturn ret)
285 case GST_PAD_LINK_OK:
287 case GST_PAD_LINK_WRONG_HIERARCHY:
288 return "wrong hierarchy";
289 case GST_PAD_LINK_WAS_LINKED:
291 case GST_PAD_LINK_WRONG_DIRECTION:
292 return "wrong direction";
293 case GST_PAD_LINK_NOFORMAT:
294 return "no common format";
295 case GST_PAD_LINK_NOSCHED:
296 return "incompatible scheduling";
297 case GST_PAD_LINK_REFUSED:
300 g_return_val_if_reached ("unknown");
307 buffer_quark = g_quark_from_static_string ("buffer"); \
308 buffer_list_quark = g_quark_from_static_string ("bufferlist"); \
309 event_quark = g_quark_from_static_string ("event"); \
311 for (i = 0; i < G_N_ELEMENTS (flow_quarks); i++) { \
312 flow_quarks[i].quark = g_quark_from_static_string (flow_quarks[i].name); \
315 GST_DEBUG_CATEGORY_INIT (debug_dataflow, "GST_DATAFLOW", \
316 GST_DEBUG_BOLD | GST_DEBUG_FG_GREEN, "dataflow inside pads"); \
319 #define gst_pad_parent_class parent_class
320 G_DEFINE_TYPE_WITH_CODE (GstPad, gst_pad, GST_TYPE_OBJECT,
321 G_ADD_PRIVATE (GstPad) _do_init);
324 gst_pad_class_init (GstPadClass * klass)
326 GObjectClass *gobject_class;
327 GstObjectClass *gstobject_class;
329 gobject_class = G_OBJECT_CLASS (klass);
330 gstobject_class = GST_OBJECT_CLASS (klass);
332 gobject_class->dispose = gst_pad_dispose;
333 gobject_class->finalize = gst_pad_finalize;
334 gobject_class->set_property = gst_pad_set_property;
335 gobject_class->get_property = gst_pad_get_property;
339 * @pad: the pad that emitted the signal
340 * @peer: the peer pad that has been connected
342 * Signals that a pad has been linked to the peer pad.
344 gst_pad_signals[PAD_LINKED] =
345 g_signal_new ("linked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
346 G_STRUCT_OFFSET (GstPadClass, linked), NULL, NULL,
347 g_cclosure_marshal_generic, G_TYPE_NONE, 1, GST_TYPE_PAD);
350 * @pad: the pad that emitted the signal
351 * @peer: the peer pad that has been disconnected
353 * Signals that a pad has been unlinked from the peer pad.
355 gst_pad_signals[PAD_UNLINKED] =
356 g_signal_new ("unlinked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
357 G_STRUCT_OFFSET (GstPadClass, unlinked), NULL, NULL,
358 g_cclosure_marshal_generic, G_TYPE_NONE, 1, GST_TYPE_PAD);
360 pspec_caps = g_param_spec_boxed ("caps", "Caps",
361 "The capabilities of the pad", GST_TYPE_CAPS,
362 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
363 g_object_class_install_property (gobject_class, PAD_PROP_CAPS, pspec_caps);
365 g_object_class_install_property (gobject_class, PAD_PROP_DIRECTION,
366 g_param_spec_enum ("direction", "Direction", "The direction of the pad",
367 GST_TYPE_PAD_DIRECTION, GST_PAD_UNKNOWN,
368 G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
370 /* FIXME, Make G_PARAM_CONSTRUCT_ONLY when we fix ghostpads. */
371 g_object_class_install_property (gobject_class, PAD_PROP_TEMPLATE,
372 g_param_spec_object ("template", "Template",
373 "The GstPadTemplate of this pad", GST_TYPE_PAD_TEMPLATE,
374 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
379 * The offset that will be applied to the running time of the pad.
383 g_object_class_install_property (gobject_class, PAD_PROP_OFFSET,
384 g_param_spec_int64 ("offset", "Offset",
385 "The running time offset of the pad", 0, G_MAXINT64, 0,
386 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
388 gstobject_class->path_string_separator = ".";
390 /* Register common function pointer descriptions */
391 GST_DEBUG_REGISTER_FUNCPTR (gst_pad_activate_default);
392 GST_DEBUG_REGISTER_FUNCPTR (gst_pad_event_default);
393 GST_DEBUG_REGISTER_FUNCPTR (gst_pad_query_default);
394 GST_DEBUG_REGISTER_FUNCPTR (gst_pad_iterate_internal_links_default);
395 GST_DEBUG_REGISTER_FUNCPTR (gst_pad_chain_list_default);
399 gst_pad_init (GstPad * pad)
401 pad->priv = gst_pad_get_instance_private (pad);
403 GST_PAD_DIRECTION (pad) = GST_PAD_UNKNOWN;
405 GST_PAD_ACTIVATEFUNC (pad) = gst_pad_activate_default;
406 GST_PAD_EVENTFUNC (pad) = gst_pad_event_default;
407 GST_PAD_QUERYFUNC (pad) = gst_pad_query_default;
408 GST_PAD_ITERINTLINKFUNC (pad) = gst_pad_iterate_internal_links_default;
409 GST_PAD_CHAINLISTFUNC (pad) = gst_pad_chain_list_default;
411 GST_PAD_SET_FLUSHING (pad);
413 g_rec_mutex_init (&pad->stream_rec_lock);
415 g_cond_init (&pad->block_cond);
417 g_hook_list_init (&pad->probes, sizeof (GstProbe));
419 pad->priv->events = g_array_sized_new (FALSE, TRUE, sizeof (PadEvent), 16);
420 pad->priv->events_cookie = 0;
421 pad->priv->last_cookie = -1;
422 g_cond_init (&pad->priv->activation_cond);
424 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
427 /* called when setting the pad inactive. It removes all sticky events from
428 * the pad. must be called with object lock */
430 remove_events (GstPad * pad)
434 gboolean notify = FALSE;
436 events = pad->priv->events;
439 for (i = 0; i < len; i++) {
440 PadEvent *ev = &g_array_index (events, PadEvent, i);
441 GstEvent *event = ev->event;
445 if (event && GST_EVENT_TYPE (event) == GST_EVENT_CAPS)
448 gst_event_unref (event);
451 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PENDING_EVENTS);
452 g_array_set_size (events, 0);
453 pad->priv->events_cookie++;
456 GST_OBJECT_UNLOCK (pad);
458 GST_DEBUG_OBJECT (pad, "notify caps");
459 g_object_notify_by_pspec ((GObject *) pad, pspec_caps);
461 GST_OBJECT_LOCK (pad);
465 /* should be called with object lock */
467 find_event_by_type (GstPad * pad, GstEventType type, guint idx)
473 events = pad->priv->events;
476 for (i = 0; i < len; i++) {
477 ev = &g_array_index (events, PadEvent, i);
478 if (ev->event == NULL)
481 if (GST_EVENT_TYPE (ev->event) == type) {
485 } else if (GST_EVENT_TYPE (ev->event) > type) {
494 /* should be called with OBJECT lock */
496 find_event (GstPad * pad, GstEvent * event)
502 events = pad->priv->events;
505 for (i = 0; i < len; i++) {
506 ev = &g_array_index (events, PadEvent, i);
507 if (event == ev->event)
509 else if (GST_EVENT_TYPE (ev->event) > GST_EVENT_TYPE (event))
517 /* should be called with OBJECT lock */
519 remove_event_by_type (GstPad * pad, GstEventType type)
525 events = pad->priv->events;
530 ev = &g_array_index (events, PadEvent, i);
531 if (ev->event == NULL)
534 if (GST_EVENT_TYPE (ev->event) > type)
536 else if (GST_EVENT_TYPE (ev->event) != type)
539 gst_event_unref (ev->event);
540 g_array_remove_index (events, i);
542 pad->priv->events_cookie++;
550 /* check all events on srcpad against those on sinkpad. All events that are not
551 * on sinkpad are marked as received=%FALSE and the PENDING_EVENTS is set on the
552 * srcpad so that the events will be sent next time */
553 /* should be called with srcpad and sinkpad LOCKS */
555 schedule_events (GstPad * srcpad, GstPad * sinkpad)
560 gboolean pending = FALSE;
562 events = srcpad->priv->events;
565 for (i = 0; i < len; i++) {
566 ev = &g_array_index (events, PadEvent, i);
567 if (ev->event == NULL)
570 if (sinkpad == NULL || !find_event (sinkpad, ev->event)) {
571 ev->received = FALSE;
576 GST_OBJECT_FLAG_SET (srcpad, GST_PAD_FLAG_PENDING_EVENTS);
579 typedef gboolean (*PadEventFunction) (GstPad * pad, PadEvent * ev,
582 /* should be called with pad LOCK */
584 events_foreach (GstPad * pad, PadEventFunction func, gpointer user_data)
591 events = pad->priv->events;
594 cookie = pad->priv->events_cookie;
598 PadEvent *ev, ev_ret;
600 ev = &g_array_index (events, PadEvent, i);
601 if (G_UNLIKELY (ev->event == NULL))
604 /* take additional ref, func might release the lock */
605 ev_ret.event = gst_event_ref (ev->event);
606 ev_ret.received = ev->received;
608 ret = func (pad, &ev_ret, user_data);
610 /* recheck the cookie, lock might have been released and the list could have
612 if (G_UNLIKELY (cookie != pad->priv->events_cookie)) {
613 if (G_LIKELY (ev_ret.event))
614 gst_event_unref (ev_ret.event);
618 /* store the received state */
619 ev->received = ev_ret.received;
621 /* if the event changed, we need to do something */
622 if (G_UNLIKELY (ev->event != ev_ret.event)) {
623 if (G_UNLIKELY (ev_ret.event == NULL)) {
624 /* function unreffed and set the event to NULL, remove it */
625 gst_event_unref (ev->event);
626 g_array_remove_index (events, i);
628 cookie = ++pad->priv->events_cookie;
631 /* function gave a new event for us */
632 gst_event_take (&ev->event, ev_ret.event);
635 /* just unref, nothing changed */
636 gst_event_unref (ev_ret.event);
645 /* should be called with LOCK */
647 _apply_pad_offset (GstPad * pad, GstEvent * event, gint64 applied_offset,
652 GST_DEBUG_OBJECT (pad, "apply pad offset %" GST_STIME_FORMAT,
653 GST_STIME_ARGS (pad->offset));
655 if (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
658 g_assert (!upstream);
660 /* copy segment values */
661 gst_event_copy_segment (event, &segment);
662 gst_event_unref (event);
664 gst_segment_offset_running_time (&segment, segment.format, applied_offset);
665 event = gst_event_new_segment (&segment);
668 event = gst_event_make_writable (event);
669 offset = gst_event_get_running_time_offset (event);
671 offset -= applied_offset;
673 offset += applied_offset;
674 gst_event_set_running_time_offset (event, offset);
679 static inline GstEvent *
680 apply_pad_offset (GstPad * pad, GstEvent * event, gboolean upstream)
682 if (G_UNLIKELY (pad->offset != 0))
683 return _apply_pad_offset (pad, event, pad->offset, upstream);
688 /* should be called with the OBJECT_LOCK */
690 get_pad_caps (GstPad * pad)
692 GstCaps *caps = NULL;
695 ev = find_event_by_type (pad, GST_EVENT_CAPS, 0);
697 gst_event_parse_caps (ev->event, &caps);
703 gst_pad_dispose (GObject * object)
705 GstPad *pad = GST_PAD_CAST (object);
708 GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pad, "%p dispose", pad);
710 /* unlink the peer pad */
711 if ((peer = gst_pad_get_peer (pad))) {
712 /* window for MT unsafeness, someone else could unlink here
713 * and then we call unlink with wrong pads. The unlink
714 * function would catch this and safely return failed. */
715 if (GST_PAD_IS_SRC (pad))
716 gst_pad_unlink (pad, peer);
718 gst_pad_unlink (peer, pad);
720 gst_object_unref (peer);
723 gst_pad_set_pad_template (pad, NULL);
725 GST_OBJECT_LOCK (pad);
727 GST_OBJECT_UNLOCK (pad);
729 g_hook_list_clear (&pad->probes);
731 G_OBJECT_CLASS (parent_class)->dispose (object);
735 gst_pad_finalize (GObject * object)
737 GstPad *pad = GST_PAD_CAST (object);
740 /* in case the task is still around, clean it up */
741 if ((task = GST_PAD_TASK (pad))) {
742 gst_task_join (task);
743 GST_PAD_TASK (pad) = NULL;
744 gst_object_unref (task);
747 if (pad->activatenotify)
748 pad->activatenotify (pad->activatedata);
749 if (pad->activatemodenotify)
750 pad->activatemodenotify (pad->activatemodedata);
752 pad->linknotify (pad->linkdata);
753 if (pad->unlinknotify)
754 pad->unlinknotify (pad->unlinkdata);
755 if (pad->chainnotify)
756 pad->chainnotify (pad->chaindata);
757 if (pad->chainlistnotify)
758 pad->chainlistnotify (pad->chainlistdata);
759 if (pad->getrangenotify)
760 pad->getrangenotify (pad->getrangedata);
761 if (pad->eventnotify)
762 pad->eventnotify (pad->eventdata);
763 if (pad->querynotify)
764 pad->querynotify (pad->querydata);
765 if (pad->iterintlinknotify)
766 pad->iterintlinknotify (pad->iterintlinkdata);
768 g_rec_mutex_clear (&pad->stream_rec_lock);
769 g_cond_clear (&pad->block_cond);
770 g_cond_clear (&pad->priv->activation_cond);
771 g_array_free (pad->priv->events, TRUE);
773 G_OBJECT_CLASS (parent_class)->finalize (object);
777 gst_pad_set_property (GObject * object, guint prop_id,
778 const GValue * value, GParamSpec * pspec)
780 g_return_if_fail (GST_IS_PAD (object));
783 case PAD_PROP_DIRECTION:
784 GST_PAD_DIRECTION (object) = (GstPadDirection) g_value_get_enum (value);
786 case PAD_PROP_TEMPLATE:
787 gst_pad_set_pad_template (GST_PAD_CAST (object),
788 (GstPadTemplate *) g_value_get_object (value));
790 case PAD_PROP_OFFSET:
791 gst_pad_set_offset (GST_PAD_CAST (object), g_value_get_int64 (value));
794 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
800 gst_pad_get_property (GObject * object, guint prop_id,
801 GValue * value, GParamSpec * pspec)
803 g_return_if_fail (GST_IS_PAD (object));
807 GST_OBJECT_LOCK (object);
808 g_value_set_boxed (value, get_pad_caps (GST_PAD_CAST (object)));
809 GST_OBJECT_UNLOCK (object);
811 case PAD_PROP_DIRECTION:
812 g_value_set_enum (value, GST_PAD_DIRECTION (object));
814 case PAD_PROP_TEMPLATE:
815 g_value_set_object (value, GST_PAD_PAD_TEMPLATE (object));
817 case PAD_PROP_OFFSET:
818 g_value_set_int64 (value, gst_pad_get_offset (GST_PAD_CAST (object)));
821 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
828 * @name: (allow-none): the name of the new pad.
829 * @direction: the #GstPadDirection of the pad.
831 * Creates a new pad with the given name in the given direction.
832 * If name is %NULL, a guaranteed unique name (across all pads)
834 * This function makes a copy of the name so you can safely free the name.
836 * Returns: (transfer floating) (nullable): a new #GstPad, or %NULL in
842 gst_pad_new (const gchar * name, GstPadDirection direction)
844 return g_object_new (GST_TYPE_PAD,
845 "name", name, "direction", direction, NULL);
849 * gst_pad_new_from_template:
850 * @templ: the pad template to use
851 * @name: (allow-none): the name of the pad
853 * Creates a new pad with the given name from the given template.
854 * If name is %NULL, a guaranteed unique name (across all pads)
856 * This function makes a copy of the name so you can safely free the name.
858 * Returns: (transfer floating) (nullable): a new #GstPad, or %NULL in
862 gst_pad_new_from_template (GstPadTemplate * templ, const gchar * name)
865 GST_PAD_TEMPLATE_GTYPE (templ) ==
866 G_TYPE_NONE ? GST_TYPE_PAD : GST_PAD_TEMPLATE_GTYPE (templ);
868 g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL);
870 return g_object_new (pad_type,
871 "name", name, "direction", templ->direction, "template", templ, NULL);
875 * gst_pad_new_from_static_template:
876 * @templ: the #GstStaticPadTemplate to use
877 * @name: the name of the pad
879 * Creates a new pad with the given name from the given static template.
880 * If name is %NULL, a guaranteed unique name (across all pads)
882 * This function makes a copy of the name so you can safely free the name.
884 * Returns: (transfer floating) (nullable): a new #GstPad, or %NULL in
888 gst_pad_new_from_static_template (GstStaticPadTemplate * templ,
892 GstPadTemplate *template;
894 template = gst_static_pad_template_get (templ);
895 pad = gst_pad_new_from_template (template, name);
896 gst_object_unref (template);
900 #define ACQUIRE_PARENT(pad, parent, label) \
902 if (G_LIKELY ((parent = GST_OBJECT_PARENT (pad)))) \
903 gst_object_ref (parent); \
904 else if (G_LIKELY (GST_PAD_NEEDS_PARENT (pad))) \
908 #define RELEASE_PARENT(parent) \
910 if (G_LIKELY (parent)) \
911 gst_object_unref (parent); \
915 * gst_pad_get_direction:
916 * @pad: a #GstPad to get the direction of.
918 * Gets the direction of the pad. The direction of the pad is
919 * decided at construction time so this function does not take
922 * Returns: the #GstPadDirection of the pad.
927 gst_pad_get_direction (GstPad * pad)
929 GstPadDirection result;
931 /* PAD_UNKNOWN is a little silly but we need some sort of
932 * error return value */
933 g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_UNKNOWN);
935 result = GST_PAD_DIRECTION (pad);
941 gst_pad_activate_default (GstPad * pad, GstObject * parent)
943 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
945 return activate_mode_internal (pad, parent, GST_PAD_MODE_PUSH, TRUE);
949 * gst_pad_mode_get_name:
950 * @mode: the pad mode
952 * Return the name of a pad mode, for use in debug messages mostly.
954 * Returns: short mnemonic for pad mode @mode
957 gst_pad_mode_get_name (GstPadMode mode)
960 case GST_PAD_MODE_NONE:
962 case GST_PAD_MODE_PUSH:
964 case GST_PAD_MODE_PULL:
972 /* Returns TRUE if pad wasn't already in the new_mode */
974 pre_activate (GstPad * pad, GstPadMode new_mode)
977 case GST_PAD_MODE_NONE:
978 GST_OBJECT_LOCK (pad);
979 while (G_UNLIKELY (pad->priv->in_activation))
980 g_cond_wait (&pad->priv->activation_cond, GST_OBJECT_GET_LOCK (pad));
981 if (new_mode == GST_PAD_MODE (pad)) {
982 GST_WARNING_OBJECT (pad,
983 "Pad is already in the process of being deactivated");
984 GST_OBJECT_UNLOCK (pad);
987 pad->priv->in_activation = TRUE;
988 GST_DEBUG_OBJECT (pad, "setting PAD_MODE NONE, set flushing");
989 GST_PAD_SET_FLUSHING (pad);
990 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
991 GST_PAD_MODE (pad) = new_mode;
992 /* unlock blocked pads so element can resume and stop */
993 GST_PAD_BLOCK_BROADCAST (pad);
994 GST_OBJECT_UNLOCK (pad);
996 case GST_PAD_MODE_PUSH:
997 case GST_PAD_MODE_PULL:
998 GST_OBJECT_LOCK (pad);
999 while (G_UNLIKELY (pad->priv->in_activation))
1000 g_cond_wait (&pad->priv->activation_cond, GST_OBJECT_GET_LOCK (pad));
1001 if (new_mode == GST_PAD_MODE (pad)) {
1002 GST_WARNING_OBJECT (pad,
1003 "Pad is already in the process of being activated");
1004 GST_OBJECT_UNLOCK (pad);
1007 pad->priv->in_activation = TRUE;
1008 GST_DEBUG_OBJECT (pad, "setting pad into %s mode, unset flushing",
1009 gst_pad_mode_get_name (new_mode));
1010 GST_PAD_UNSET_FLUSHING (pad);
1011 pad->ABI.abi.last_flowret = GST_FLOW_OK;
1012 GST_PAD_MODE (pad) = new_mode;
1013 if (GST_PAD_IS_SINK (pad)) {
1015 /* make sure the peer src pad sends us all events */
1016 if ((peer = GST_PAD_PEER (pad))) {
1017 gst_object_ref (peer);
1018 GST_OBJECT_UNLOCK (pad);
1020 GST_DEBUG_OBJECT (pad, "reschedule events on peer %s:%s",
1021 GST_DEBUG_PAD_NAME (peer));
1023 GST_OBJECT_LOCK (peer);
1024 schedule_events (peer, NULL);
1025 GST_OBJECT_UNLOCK (peer);
1027 gst_object_unref (peer);
1029 GST_OBJECT_UNLOCK (pad);
1032 GST_OBJECT_UNLOCK (pad);
1040 post_activate (GstPad * pad, GstPadMode new_mode)
1043 case GST_PAD_MODE_NONE:
1044 GST_OBJECT_LOCK (pad);
1045 pad->priv->in_activation = FALSE;
1046 g_cond_broadcast (&pad->priv->activation_cond);
1047 GST_OBJECT_UNLOCK (pad);
1049 /* ensures that streaming stops */
1050 GST_PAD_STREAM_LOCK (pad);
1051 GST_DEBUG_OBJECT (pad, "stopped streaming");
1052 GST_OBJECT_LOCK (pad);
1053 remove_events (pad);
1054 GST_OBJECT_UNLOCK (pad);
1055 GST_PAD_STREAM_UNLOCK (pad);
1057 case GST_PAD_MODE_PUSH:
1058 case GST_PAD_MODE_PULL:
1059 GST_OBJECT_LOCK (pad);
1060 pad->priv->in_activation = FALSE;
1061 g_cond_broadcast (&pad->priv->activation_cond);
1062 GST_OBJECT_UNLOCK (pad);
1069 * gst_pad_set_active:
1070 * @pad: the #GstPad to activate or deactivate.
1071 * @active: whether or not the pad should be active.
1073 * Activates or deactivates the given pad.
1074 * Normally called from within core state change functions.
1076 * If @active, makes sure the pad is active. If it is already active, either in
1077 * push or pull mode, just return. Otherwise dispatches to the pad's activate
1078 * function to perform the actual activation.
1080 * If not @active, calls gst_pad_activate_mode() with the pad's current mode
1081 * and a %FALSE argument.
1083 * Returns: %TRUE if the operation was successful.
1088 gst_pad_set_active (GstPad * pad, gboolean active)
1092 gboolean ret = FALSE;
1094 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1096 GST_OBJECT_LOCK (pad);
1097 old = GST_PAD_MODE (pad);
1098 ACQUIRE_PARENT (pad, parent, no_parent);
1099 GST_OBJECT_UNLOCK (pad);
1102 if (old == GST_PAD_MODE_NONE) {
1103 GST_DEBUG_OBJECT (pad, "activating pad from none");
1104 ret = (GST_PAD_ACTIVATEFUNC (pad)) (pad, parent);
1106 pad->ABI.abi.last_flowret = GST_FLOW_OK;
1108 GST_DEBUG_OBJECT (pad, "pad was active in %s mode",
1109 gst_pad_mode_get_name (old));
1113 if (old == GST_PAD_MODE_NONE) {
1114 GST_DEBUG_OBJECT (pad, "pad was inactive");
1117 GST_DEBUG_OBJECT (pad, "deactivating pad from %s mode",
1118 gst_pad_mode_get_name (old));
1119 ret = activate_mode_internal (pad, parent, old, FALSE);
1121 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
1125 RELEASE_PARENT (parent);
1127 if (G_UNLIKELY (!ret))
1135 GST_DEBUG_OBJECT (pad, "no parent");
1136 GST_OBJECT_UNLOCK (pad);
1141 GST_OBJECT_LOCK (pad);
1143 g_critical ("Failed to deactivate pad %s:%s, very bad",
1144 GST_DEBUG_PAD_NAME (pad));
1146 GST_WARNING_OBJECT (pad, "Failed to activate pad");
1148 GST_OBJECT_UNLOCK (pad);
1154 activate_mode_internal (GstPad * pad, GstObject * parent, GstPadMode mode,
1157 gboolean res = FALSE;
1158 GstPadMode old, new;
1159 GstPadDirection dir;
1162 GST_OBJECT_LOCK (pad);
1163 old = GST_PAD_MODE (pad);
1164 dir = GST_PAD_DIRECTION (pad);
1165 GST_OBJECT_UNLOCK (pad);
1167 new = active ? mode : GST_PAD_MODE_NONE;
1172 if (active && old != mode && old != GST_PAD_MODE_NONE) {
1173 /* pad was activate in the wrong direction, deactivate it
1174 * and reactivate it in the requested mode */
1175 GST_DEBUG_OBJECT (pad, "deactivating pad from %s mode",
1176 gst_pad_mode_get_name (old));
1178 if (G_UNLIKELY (!activate_mode_internal (pad, parent, old, FALSE)))
1179 goto deactivate_failed;
1180 old = GST_PAD_MODE_NONE;
1184 case GST_PAD_MODE_PULL:
1186 if (dir == GST_PAD_SINK) {
1187 if ((peer = gst_pad_get_peer (pad))) {
1188 GST_DEBUG_OBJECT (pad, "calling peer");
1189 if (G_UNLIKELY (!gst_pad_activate_mode (peer, mode, active)))
1191 gst_object_unref (peer);
1193 /* there is no peer, this is only fatal when we activate. When we
1194 * deactivate, we must assume the application has unlinked the peer and
1195 * will deactivate it eventually. */
1199 GST_DEBUG_OBJECT (pad, "deactivating unlinked pad");
1202 if (G_UNLIKELY (GST_PAD_GETRANGEFUNC (pad) == NULL))
1203 goto failure; /* Can't activate pull on a src without a
1204 getrange function */
1212 /* Mark pad as needing reconfiguration */
1214 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
1216 /* pre_activate returns TRUE if we weren't already in the process of
1217 * switching to the 'new' mode */
1218 if (pre_activate (pad, new)) {
1220 if (GST_PAD_ACTIVATEMODEFUNC (pad)) {
1221 if (G_UNLIKELY (!GST_PAD_ACTIVATEMODEFUNC (pad) (pad, parent, mode,
1225 /* can happen for sinks of passthrough elements */
1228 post_activate (pad, new);
1231 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "%s in %s mode",
1232 active ? "activated" : "deactivated", gst_pad_mode_get_name (mode));
1237 /* Clear sticky flags on deactivation */
1239 GST_OBJECT_LOCK (pad);
1240 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
1241 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_EOS);
1242 GST_OBJECT_UNLOCK (pad);
1250 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "already %s in %s mode",
1251 active ? "activated" : "deactivated", gst_pad_mode_get_name (mode));
1256 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad,
1257 "failed to %s in switch to %s mode from %s mode",
1258 (active ? "activate" : "deactivate"), gst_pad_mode_get_name (mode),
1259 gst_pad_mode_get_name (old));
1264 GST_OBJECT_LOCK (peer);
1265 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad,
1266 "activate_mode on peer (%s:%s) failed", GST_DEBUG_PAD_NAME (peer));
1267 GST_OBJECT_UNLOCK (peer);
1268 gst_object_unref (peer);
1273 GST_CAT_INFO_OBJECT (GST_CAT_PADS, pad, "can't activate unlinked sink "
1274 "pad in pull mode");
1279 GST_OBJECT_LOCK (pad);
1280 GST_CAT_INFO_OBJECT (GST_CAT_PADS, pad, "failed to %s in %s mode",
1281 active ? "activate" : "deactivate", gst_pad_mode_get_name (mode));
1282 GST_PAD_SET_FLUSHING (pad);
1283 GST_PAD_MODE (pad) = old;
1284 pad->priv->in_activation = FALSE;
1285 g_cond_broadcast (&pad->priv->activation_cond);
1286 GST_OBJECT_UNLOCK (pad);
1292 * gst_pad_activate_mode:
1293 * @pad: the #GstPad to activate or deactivate.
1294 * @mode: the requested activation mode
1295 * @active: whether or not the pad should be active.
1297 * Activates or deactivates the given pad in @mode via dispatching to the
1298 * pad's activatemodefunc. For use from within pad activation functions only.
1300 * If you don't know what this is, you probably don't want to call it.
1302 * Returns: %TRUE if the operation was successful.
1307 gst_pad_activate_mode (GstPad * pad, GstPadMode mode, gboolean active)
1311 GstPadMode old, new;
1313 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1315 GST_OBJECT_LOCK (pad);
1317 old = GST_PAD_MODE (pad);
1318 new = active ? mode : GST_PAD_MODE_NONE;
1322 ACQUIRE_PARENT (pad, parent, no_parent);
1324 GST_OBJECT_UNLOCK (pad);
1326 res = activate_mode_internal (pad, parent, mode, active);
1328 RELEASE_PARENT (parent);
1334 GST_OBJECT_UNLOCK (pad);
1335 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "already %s in %s mode",
1336 active ? "activated" : "deactivated", gst_pad_mode_get_name (mode));
1341 GST_WARNING_OBJECT (pad, "no parent");
1342 GST_OBJECT_UNLOCK (pad);
1348 * gst_pad_is_active:
1349 * @pad: the #GstPad to query
1351 * Query if a pad is active
1353 * Returns: %TRUE if the pad is active.
1358 gst_pad_is_active (GstPad * pad)
1360 gboolean result = FALSE;
1362 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1364 GST_OBJECT_LOCK (pad);
1365 result = GST_PAD_IS_ACTIVE (pad);
1366 GST_OBJECT_UNLOCK (pad);
1372 cleanup_hook (GstPad * pad, GHook * hook)
1374 GstPadProbeType type;
1376 if (!G_HOOK_IS_VALID (hook))
1379 type = (hook->flags) >> G_HOOK_FLAG_USER_SHIFT;
1381 if (type & GST_PAD_PROBE_TYPE_BLOCKING) {
1382 /* unblock when we remove the last blocking probe */
1384 GST_DEBUG_OBJECT (pad, "remove blocking probe, now %d left",
1387 /* Might have new probes now that want to be called */
1388 GST_PAD_BLOCK_BROADCAST (pad);
1390 if (pad->num_blocked == 0) {
1391 GST_DEBUG_OBJECT (pad, "last blocking probe removed, unblocking");
1392 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_BLOCKED);
1395 g_hook_destroy_link (&pad->probes, hook);
1400 * gst_pad_add_probe:
1401 * @pad: the #GstPad to add the probe to
1402 * @mask: the probe mask
1403 * @callback: #GstPadProbeCallback that will be called with notifications of
1405 * @user_data: (closure): user data passed to the callback
1406 * @destroy_data: #GDestroyNotify for user_data
1408 * Be notified of different states of pads. The provided callback is called for
1409 * every state that matches @mask.
1411 * Probes are called in groups: First GST_PAD_PROBE_TYPE_BLOCK probes are
1412 * called, then others, then finally GST_PAD_PROBE_TYPE_IDLE. The only
1413 * exception here are GST_PAD_PROBE_TYPE_IDLE probes that are called
1414 * immediately if the pad is already idle while calling gst_pad_add_probe().
1415 * In each of the groups, probes are called in the order in which they were
1418 * Returns: an id or 0 if no probe is pending. The id can be used to remove the
1419 * probe with gst_pad_remove_probe(). When using GST_PAD_PROBE_TYPE_IDLE it can
1420 * happen that the probe can be run immediately and if the probe returns
1421 * GST_PAD_PROBE_REMOVE this functions returns 0.
1426 gst_pad_add_probe (GstPad * pad, GstPadProbeType mask,
1427 GstPadProbeCallback callback, gpointer user_data,
1428 GDestroyNotify destroy_data)
1433 g_return_val_if_fail (GST_IS_PAD (pad), 0);
1434 g_return_val_if_fail (mask != 0, 0);
1436 GST_OBJECT_LOCK (pad);
1438 /* make a new probe */
1439 hook = g_hook_alloc (&pad->probes);
1441 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "adding probe for mask 0x%08x",
1444 /* when no constraints are given for the types, assume all types are
1446 if ((mask & _PAD_PROBE_TYPE_ALL_BOTH_AND_FLUSH) == 0)
1447 mask |= GST_PAD_PROBE_TYPE_ALL_BOTH;
1448 if ((mask & GST_PAD_PROBE_TYPE_SCHEDULING) == 0)
1449 mask |= GST_PAD_PROBE_TYPE_SCHEDULING;
1451 /* store our flags and other fields */
1452 hook->flags |= (mask << G_HOOK_FLAG_USER_SHIFT);
1453 hook->func = callback;
1454 hook->data = user_data;
1455 hook->destroy = destroy_data;
1458 g_hook_append (&pad->probes, hook);
1460 /* incremenent cookie so that the new hook gets called */
1461 pad->priv->probe_list_cookie++;
1463 /* get the id of the hook, we return this and it can be used to remove the
1465 res = hook->hook_id;
1467 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "got probe id %lu", res);
1469 if (mask & GST_PAD_PROBE_TYPE_BLOCKING) {
1470 /* we have a block probe */
1472 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_BLOCKED);
1473 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "added blocking probe, "
1474 "now %d blocking probes", pad->num_blocked);
1476 /* Might have new probes now that want to be called */
1477 GST_PAD_BLOCK_BROADCAST (pad);
1480 /* call the callback if we need to be called for idle callbacks */
1481 if ((mask & GST_PAD_PROBE_TYPE_IDLE) && (callback != NULL)) {
1482 if (pad->priv->using > 0) {
1483 /* the pad is in use, we can't signal the idle callback yet. Since we set the
1484 * flag above, the last thread to leave the push will do the callback. New
1485 * threads going into the push will block. */
1486 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
1487 "pad is in use, delay idle callback");
1488 GST_OBJECT_UNLOCK (pad);
1490 GstPadProbeInfo info = { GST_PAD_PROBE_TYPE_IDLE, res, };
1491 GstPadProbeReturn ret;
1493 /* Keep another ref, the callback could destroy the pad */
1494 gst_object_ref (pad);
1495 pad->priv->idle_running++;
1497 /* the pad is idle now, we can signal the idle callback now */
1498 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
1499 "pad is idle, trigger idle callback");
1500 GST_OBJECT_UNLOCK (pad);
1502 ret = callback (pad, &info, user_data);
1504 GST_OBJECT_LOCK (pad);
1506 case GST_PAD_PROBE_REMOVE:
1507 /* remove the probe */
1508 GST_DEBUG_OBJECT (pad, "asked to remove hook");
1509 cleanup_hook (pad, hook);
1512 case GST_PAD_PROBE_DROP:
1513 GST_DEBUG_OBJECT (pad, "asked to drop item");
1515 case GST_PAD_PROBE_PASS:
1516 GST_DEBUG_OBJECT (pad, "asked to pass item");
1518 case GST_PAD_PROBE_OK:
1519 GST_DEBUG_OBJECT (pad, "probe returned OK");
1521 case GST_PAD_PROBE_HANDLED:
1522 GST_DEBUG_OBJECT (pad, "probe handled the data");
1525 GST_DEBUG_OBJECT (pad, "probe returned %d", ret);
1528 pad->priv->idle_running--;
1529 if (pad->priv->idle_running == 0) {
1530 GST_PAD_BLOCK_BROADCAST (pad);
1532 GST_OBJECT_UNLOCK (pad);
1534 gst_object_unref (pad);
1537 GST_OBJECT_UNLOCK (pad);
1543 * gst_pad_remove_probe:
1544 * @pad: the #GstPad with the probe
1545 * @id: the probe id to remove
1547 * Remove the probe with @id from @pad.
1552 gst_pad_remove_probe (GstPad * pad, gulong id)
1556 g_return_if_fail (GST_IS_PAD (pad));
1558 GST_OBJECT_LOCK (pad);
1560 hook = g_hook_get (&pad->probes, id);
1564 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "removing hook %ld",
1566 cleanup_hook (pad, hook);
1567 GST_OBJECT_UNLOCK (pad);
1573 GST_OBJECT_UNLOCK (pad);
1574 g_warning ("%s: pad `%p' has no probe with id `%lu'", G_STRLOC, pad, id);
1580 * gst_pad_is_blocked:
1581 * @pad: the #GstPad to query
1583 * Checks if the pad is blocked or not. This function returns the
1584 * last requested state of the pad. It is not certain that the pad
1585 * is actually blocking at this point (see gst_pad_is_blocking()).
1587 * Returns: %TRUE if the pad is blocked.
1592 gst_pad_is_blocked (GstPad * pad)
1594 gboolean result = FALSE;
1596 g_return_val_if_fail (GST_IS_PAD (pad), result);
1598 GST_OBJECT_LOCK (pad);
1599 result = GST_OBJECT_FLAG_IS_SET (pad, GST_PAD_FLAG_BLOCKED);
1600 GST_OBJECT_UNLOCK (pad);
1606 * gst_pad_is_blocking:
1607 * @pad: the #GstPad to query
1609 * Checks if the pad is blocking or not. This is a guaranteed state
1610 * of whether the pad is actually blocking on a #GstBuffer or a #GstEvent.
1612 * Returns: %TRUE if the pad is blocking.
1617 gst_pad_is_blocking (GstPad * pad)
1619 gboolean result = FALSE;
1621 g_return_val_if_fail (GST_IS_PAD (pad), result);
1623 GST_OBJECT_LOCK (pad);
1624 /* the blocking flag is only valid if the pad is not flushing */
1625 result = GST_PAD_IS_BLOCKING (pad) && !GST_PAD_IS_FLUSHING (pad);
1626 GST_OBJECT_UNLOCK (pad);
1632 * gst_pad_needs_reconfigure:
1633 * @pad: the #GstPad to check
1635 * Check the #GST_PAD_FLAG_NEED_RECONFIGURE flag on @pad and return %TRUE
1636 * if the flag was set.
1638 * Returns: %TRUE is the GST_PAD_FLAG_NEED_RECONFIGURE flag is set on @pad.
1641 gst_pad_needs_reconfigure (GstPad * pad)
1643 gboolean reconfigure;
1645 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1647 GST_OBJECT_LOCK (pad);
1648 reconfigure = GST_PAD_NEEDS_RECONFIGURE (pad);
1649 GST_DEBUG_OBJECT (pad, "peeking RECONFIGURE flag %d", reconfigure);
1650 GST_OBJECT_UNLOCK (pad);
1656 * gst_pad_check_reconfigure:
1657 * @pad: the #GstPad to check
1659 * Check and clear the #GST_PAD_FLAG_NEED_RECONFIGURE flag on @pad and return %TRUE
1660 * if the flag was set.
1662 * Returns: %TRUE is the GST_PAD_FLAG_NEED_RECONFIGURE flag was set on @pad.
1665 gst_pad_check_reconfigure (GstPad * pad)
1667 gboolean reconfigure;
1669 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
1671 GST_OBJECT_LOCK (pad);
1672 reconfigure = GST_PAD_NEEDS_RECONFIGURE (pad);
1674 GST_DEBUG_OBJECT (pad, "remove RECONFIGURE flag");
1675 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
1677 GST_OBJECT_UNLOCK (pad);
1683 * gst_pad_mark_reconfigure:
1684 * @pad: the #GstPad to mark
1686 * Mark a pad for needing reconfiguration. The next call to
1687 * gst_pad_check_reconfigure() will return %TRUE after this call.
1690 gst_pad_mark_reconfigure (GstPad * pad)
1692 g_return_if_fail (GST_IS_PAD (pad));
1694 GST_OBJECT_LOCK (pad);
1695 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
1696 GST_OBJECT_UNLOCK (pad);
1700 * gst_pad_set_activate_function:
1702 * @f: the #GstPadActivateFunction to set.
1704 * Calls gst_pad_set_activate_function_full() with %NULL for the user_data and
1708 * gst_pad_set_activate_function_full:
1710 * @activate: the #GstPadActivateFunction to set.
1711 * @user_data: user_data passed to @notify
1712 * @notify: notify called when @activate will not be used anymore.
1714 * Sets the given activate function for @pad. The activate function will
1715 * dispatch to gst_pad_activate_mode() to perform the actual activation.
1716 * Only makes sense to set on sink pads.
1718 * Call this function if your sink pad can start a pull-based task.
1721 gst_pad_set_activate_function_full (GstPad * pad,
1722 GstPadActivateFunction activate, gpointer user_data, GDestroyNotify notify)
1724 g_return_if_fail (GST_IS_PAD (pad));
1726 if (pad->activatenotify)
1727 pad->activatenotify (pad->activatedata);
1728 GST_PAD_ACTIVATEFUNC (pad) = activate;
1729 pad->activatedata = user_data;
1730 pad->activatenotify = notify;
1732 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "activatefunc set to %s",
1733 GST_DEBUG_FUNCPTR_NAME (activate));
1737 * gst_pad_set_activatemode_function:
1739 * @f: the #GstPadActivateModeFunction to set.
1741 * Calls gst_pad_set_activatemode_function_full() with %NULL for the user_data and
1745 * gst_pad_set_activatemode_function_full:
1747 * @activatemode: the #GstPadActivateModeFunction to set.
1748 * @user_data: user_data passed to @notify
1749 * @notify: notify called when @activatemode will not be used anymore.
1751 * Sets the given activate_mode function for the pad. An activate_mode function
1752 * prepares the element for data passing.
1755 gst_pad_set_activatemode_function_full (GstPad * pad,
1756 GstPadActivateModeFunction activatemode, gpointer user_data,
1757 GDestroyNotify notify)
1759 g_return_if_fail (GST_IS_PAD (pad));
1761 if (pad->activatemodenotify)
1762 pad->activatemodenotify (pad->activatemodedata);
1763 GST_PAD_ACTIVATEMODEFUNC (pad) = activatemode;
1764 pad->activatemodedata = user_data;
1765 pad->activatemodenotify = notify;
1767 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "activatemodefunc set to %s",
1768 GST_DEBUG_FUNCPTR_NAME (activatemode));
1772 * gst_pad_set_chain_function:
1773 * @p: a sink #GstPad.
1774 * @f: the #GstPadChainFunction to set.
1776 * Calls gst_pad_set_chain_function_full() with %NULL for the user_data and
1780 * gst_pad_set_chain_function_full:
1781 * @pad: a sink #GstPad.
1782 * @chain: the #GstPadChainFunction to set.
1783 * @user_data: user_data passed to @notify
1784 * @notify: notify called when @chain will not be used anymore.
1786 * Sets the given chain function for the pad. The chain function is called to
1787 * process a #GstBuffer input buffer. see #GstPadChainFunction for more details.
1790 gst_pad_set_chain_function_full (GstPad * pad, GstPadChainFunction chain,
1791 gpointer user_data, GDestroyNotify notify)
1793 g_return_if_fail (GST_IS_PAD (pad));
1794 g_return_if_fail (GST_PAD_IS_SINK (pad));
1796 if (pad->chainnotify)
1797 pad->chainnotify (pad->chaindata);
1798 GST_PAD_CHAINFUNC (pad) = chain;
1799 pad->chaindata = user_data;
1800 pad->chainnotify = notify;
1802 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "chainfunc set to %s",
1803 GST_DEBUG_FUNCPTR_NAME (chain));
1807 * gst_pad_set_chain_list_function:
1808 * @p: a sink #GstPad.
1809 * @f: the #GstPadChainListFunction to set.
1811 * Calls gst_pad_set_chain_list_function_full() with %NULL for the user_data and
1815 * gst_pad_set_chain_list_function_full:
1816 * @pad: a sink #GstPad.
1817 * @chainlist: the #GstPadChainListFunction to set.
1818 * @user_data: user_data passed to @notify
1819 * @notify: notify called when @chainlist will not be used anymore.
1821 * Sets the given chain list function for the pad. The chainlist function is
1822 * called to process a #GstBufferList input buffer list. See
1823 * #GstPadChainListFunction for more details.
1826 gst_pad_set_chain_list_function_full (GstPad * pad,
1827 GstPadChainListFunction chainlist, gpointer user_data,
1828 GDestroyNotify notify)
1830 g_return_if_fail (GST_IS_PAD (pad));
1831 g_return_if_fail (GST_PAD_IS_SINK (pad));
1833 if (pad->chainlistnotify)
1834 pad->chainlistnotify (pad->chainlistdata);
1835 GST_PAD_CHAINLISTFUNC (pad) = chainlist;
1836 pad->chainlistdata = user_data;
1837 pad->chainlistnotify = notify;
1839 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "chainlistfunc set to %s",
1840 GST_DEBUG_FUNCPTR_NAME (chainlist));
1844 * gst_pad_set_getrange_function:
1845 * @p: a source #GstPad.
1846 * @f: the #GstPadGetRangeFunction to set.
1848 * Calls gst_pad_set_getrange_function_full() with %NULL for the user_data and
1852 * gst_pad_set_getrange_function_full:
1853 * @pad: a source #GstPad.
1854 * @get: the #GstPadGetRangeFunction to set.
1855 * @user_data: user_data passed to @notify
1856 * @notify: notify called when @get will not be used anymore.
1858 * Sets the given getrange function for the pad. The getrange function is
1859 * called to produce a new #GstBuffer to start the processing pipeline. see
1860 * #GstPadGetRangeFunction for a description of the getrange function.
1863 gst_pad_set_getrange_function_full (GstPad * pad, GstPadGetRangeFunction get,
1864 gpointer user_data, GDestroyNotify notify)
1866 g_return_if_fail (GST_IS_PAD (pad));
1867 g_return_if_fail (GST_PAD_IS_SRC (pad));
1869 if (pad->getrangenotify)
1870 pad->getrangenotify (pad->getrangedata);
1871 GST_PAD_GETRANGEFUNC (pad) = get;
1872 pad->getrangedata = user_data;
1873 pad->getrangenotify = notify;
1875 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "getrangefunc set to %s",
1876 GST_DEBUG_FUNCPTR_NAME (get));
1880 * gst_pad_set_event_function:
1881 * @p: a #GstPad of either direction.
1882 * @f: the #GstPadEventFunction to set.
1884 * Calls gst_pad_set_event_function_full() with %NULL for the user_data and
1888 * gst_pad_set_event_function_full:
1889 * @pad: a #GstPad of either direction.
1890 * @event: the #GstPadEventFunction to set.
1891 * @user_data: user_data passed to @notify
1892 * @notify: notify called when @event will not be used anymore.
1894 * Sets the given event handler for the pad.
1897 gst_pad_set_event_function_full (GstPad * pad, GstPadEventFunction event,
1898 gpointer user_data, GDestroyNotify notify)
1900 g_return_if_fail (GST_IS_PAD (pad));
1902 if (pad->eventnotify)
1903 pad->eventnotify (pad->eventdata);
1904 GST_PAD_EVENTFUNC (pad) = event;
1905 pad->eventdata = user_data;
1906 pad->eventnotify = notify;
1908 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "eventfunc for set to %s",
1909 GST_DEBUG_FUNCPTR_NAME (event));
1913 event_wrap (GstPad * pad, GstObject * object, GstEvent * event)
1917 ret = GST_PAD_EVENTFULLFUNC (pad) (pad, object, event);
1918 if (ret == GST_FLOW_OK)
1924 * gst_pad_set_event_full_function:
1925 * @p: a #GstPad of either direction.
1926 * @f: the #GstPadEventFullFunction to set.
1928 * Calls gst_pad_set_event_full_function_full() with %NULL for the user_data and
1932 * gst_pad_set_event_full_function_full:
1933 * @pad: a #GstPad of either direction.
1934 * @event: the #GstPadEventFullFunction to set.
1935 * @user_data: user_data passed to @notify
1936 * @notify: notify called when @event will not be used anymore.
1938 * Sets the given event handler for the pad.
1943 gst_pad_set_event_full_function_full (GstPad * pad,
1944 GstPadEventFullFunction event, gpointer user_data, GDestroyNotify notify)
1946 g_return_if_fail (GST_IS_PAD (pad));
1948 if (pad->eventnotify)
1949 pad->eventnotify (pad->eventdata);
1950 GST_PAD_EVENTFULLFUNC (pad) = event;
1951 GST_PAD_EVENTFUNC (pad) = event_wrap;
1952 pad->eventdata = user_data;
1953 pad->eventnotify = notify;
1955 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "eventfullfunc for set to %s",
1956 GST_DEBUG_FUNCPTR_NAME (event));
1960 * gst_pad_set_query_function:
1961 * @p: a #GstPad of either direction.
1962 * @f: the #GstPadQueryFunction to set.
1964 * Calls gst_pad_set_query_function_full() with %NULL for the user_data and
1968 * gst_pad_set_query_function_full:
1969 * @pad: a #GstPad of either direction.
1970 * @query: the #GstPadQueryFunction to set.
1971 * @user_data: user_data passed to @notify
1972 * @notify: notify called when @query will not be used anymore.
1974 * Set the given query function for the pad.
1977 gst_pad_set_query_function_full (GstPad * pad, GstPadQueryFunction query,
1978 gpointer user_data, GDestroyNotify notify)
1980 g_return_if_fail (GST_IS_PAD (pad));
1982 if (pad->querynotify)
1983 pad->querynotify (pad->querydata);
1984 GST_PAD_QUERYFUNC (pad) = query;
1985 pad->querydata = user_data;
1986 pad->querynotify = notify;
1988 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "queryfunc set to %s",
1989 GST_DEBUG_FUNCPTR_NAME (query));
1993 * gst_pad_set_iterate_internal_links_function:
1994 * @p: a #GstPad of either direction.
1995 * @f: the #GstPadIterIntLinkFunction to set.
1997 * Calls gst_pad_set_iterate_internal_links_function_full() with %NULL
1998 * for the user_data and notify.
2001 * gst_pad_set_iterate_internal_links_function_full:
2002 * @pad: a #GstPad of either direction.
2003 * @iterintlink: the #GstPadIterIntLinkFunction to set.
2004 * @user_data: user_data passed to @notify
2005 * @notify: notify called when @iterintlink will not be used anymore.
2007 * Sets the given internal link iterator function for the pad.
2010 gst_pad_set_iterate_internal_links_function_full (GstPad * pad,
2011 GstPadIterIntLinkFunction iterintlink, gpointer user_data,
2012 GDestroyNotify notify)
2014 g_return_if_fail (GST_IS_PAD (pad));
2016 if (pad->iterintlinknotify)
2017 pad->iterintlinknotify (pad->iterintlinkdata);
2018 GST_PAD_ITERINTLINKFUNC (pad) = iterintlink;
2019 pad->iterintlinkdata = user_data;
2020 pad->iterintlinknotify = notify;
2022 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "internal link iterator set to %s",
2023 GST_DEBUG_FUNCPTR_NAME (iterintlink));
2027 * gst_pad_set_link_function:
2029 * @f: the #GstPadLinkFunction to set.
2031 * Calls gst_pad_set_link_function_full() with %NULL
2032 * for the user_data and notify.
2035 * gst_pad_set_link_function_full:
2037 * @link: the #GstPadLinkFunction to set.
2038 * @user_data: user_data passed to @notify
2039 * @notify: notify called when @link will not be used anymore.
2041 * Sets the given link function for the pad. It will be called when
2042 * the pad is linked with another pad.
2044 * The return value #GST_PAD_LINK_OK should be used when the connection can be
2047 * The return value #GST_PAD_LINK_REFUSED should be used when the connection
2048 * cannot be made for some reason.
2050 * If @link is installed on a source pad, it should call the #GstPadLinkFunction
2051 * of the peer sink pad, if present.
2054 gst_pad_set_link_function_full (GstPad * pad, GstPadLinkFunction link,
2055 gpointer user_data, GDestroyNotify notify)
2057 g_return_if_fail (GST_IS_PAD (pad));
2059 if (pad->linknotify)
2060 pad->linknotify (pad->linkdata);
2061 GST_PAD_LINKFUNC (pad) = link;
2062 pad->linkdata = user_data;
2063 pad->linknotify = notify;
2065 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "linkfunc set to %s",
2066 GST_DEBUG_FUNCPTR_NAME (link));
2070 * gst_pad_set_unlink_function:
2072 * @f: the #GstPadUnlinkFunction to set.
2074 * Calls gst_pad_set_unlink_function_full() with %NULL
2075 * for the user_data and notify.
2078 * gst_pad_set_unlink_function_full:
2080 * @unlink: the #GstPadUnlinkFunction to set.
2081 * @user_data: user_data passed to @notify
2082 * @notify: notify called when @unlink will not be used anymore.
2084 * Sets the given unlink function for the pad. It will be called
2085 * when the pad is unlinked.
2088 gst_pad_set_unlink_function_full (GstPad * pad, GstPadUnlinkFunction unlink,
2089 gpointer user_data, GDestroyNotify notify)
2091 g_return_if_fail (GST_IS_PAD (pad));
2093 if (pad->unlinknotify)
2094 pad->unlinknotify (pad->unlinkdata);
2095 GST_PAD_UNLINKFUNC (pad) = unlink;
2096 pad->unlinkdata = user_data;
2097 pad->unlinknotify = notify;
2099 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "unlinkfunc set to %s",
2100 GST_DEBUG_FUNCPTR_NAME (unlink));
2105 * @srcpad: the source #GstPad to unlink.
2106 * @sinkpad: the sink #GstPad to unlink.
2108 * Unlinks the source pad from the sink pad. Will emit the #GstPad::unlinked
2109 * signal on both pads.
2111 * Returns: %TRUE if the pads were unlinked. This function returns %FALSE if
2112 * the pads were not linked together.
2117 gst_pad_unlink (GstPad * srcpad, GstPad * sinkpad)
2119 gboolean result = FALSE;
2120 GstElement *parent = NULL;
2122 g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
2123 g_return_val_if_fail (GST_PAD_IS_SRC (srcpad), FALSE);
2124 g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
2125 g_return_val_if_fail (GST_PAD_IS_SINK (sinkpad), FALSE);
2127 GST_TRACER_PAD_UNLINK_PRE (srcpad, sinkpad);
2129 GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinking %s:%s(%p) and %s:%s(%p)",
2130 GST_DEBUG_PAD_NAME (srcpad), srcpad,
2131 GST_DEBUG_PAD_NAME (sinkpad), sinkpad);
2133 /* We need to notify the parent before taking any pad locks as the bin in
2134 * question might be waiting for a lock on the pad while holding its lock
2135 * that our message will try to take. */
2136 if ((parent = GST_ELEMENT_CAST (gst_pad_get_parent (srcpad)))) {
2137 if (GST_IS_ELEMENT (parent)) {
2138 gst_element_post_message (parent,
2139 gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
2140 GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK, parent, TRUE));
2142 gst_object_unref (parent);
2147 GST_OBJECT_LOCK (srcpad);
2148 GST_OBJECT_LOCK (sinkpad);
2150 if (G_UNLIKELY (GST_PAD_PEER (srcpad) != sinkpad))
2151 goto not_linked_together;
2153 if (GST_PAD_UNLINKFUNC (srcpad)) {
2154 GstObject *tmpparent;
2156 ACQUIRE_PARENT (srcpad, tmpparent, no_src_parent);
2158 GST_PAD_UNLINKFUNC (srcpad) (srcpad, tmpparent);
2159 RELEASE_PARENT (tmpparent);
2162 if (GST_PAD_UNLINKFUNC (sinkpad)) {
2163 GstObject *tmpparent;
2165 ACQUIRE_PARENT (sinkpad, tmpparent, no_sink_parent);
2167 GST_PAD_UNLINKFUNC (sinkpad) (sinkpad, tmpparent);
2168 RELEASE_PARENT (tmpparent);
2172 /* first clear peers */
2173 GST_PAD_PEER (srcpad) = NULL;
2174 GST_PAD_PEER (sinkpad) = NULL;
2176 GST_OBJECT_UNLOCK (sinkpad);
2177 GST_OBJECT_UNLOCK (srcpad);
2179 /* fire off a signal to each of the pads telling them
2180 * that they've been unlinked */
2181 g_signal_emit (srcpad, gst_pad_signals[PAD_UNLINKED], 0, sinkpad);
2182 g_signal_emit (sinkpad, gst_pad_signals[PAD_UNLINKED], 0, srcpad);
2184 GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinked %s:%s and %s:%s",
2185 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
2190 if (parent != NULL) {
2191 gst_element_post_message (parent,
2192 gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
2193 GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK, parent, FALSE));
2194 gst_object_unref (parent);
2196 GST_TRACER_PAD_UNLINK_POST (srcpad, sinkpad, result);
2200 not_linked_together:
2202 /* we do not emit a warning in this case because unlinking cannot
2203 * be made MT safe.*/
2204 GST_OBJECT_UNLOCK (sinkpad);
2205 GST_OBJECT_UNLOCK (srcpad);
2211 * gst_pad_is_linked:
2212 * @pad: pad to check
2214 * Checks if a @pad is linked to another pad or not.
2216 * Returns: %TRUE if the pad is linked, %FALSE otherwise.
2221 gst_pad_is_linked (GstPad * pad)
2225 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2227 GST_OBJECT_LOCK (pad);
2228 result = (GST_PAD_PEER (pad) != NULL);
2229 GST_OBJECT_UNLOCK (pad);
2234 /* get the caps from both pads and see if the intersection
2237 * This function should be called with the pad LOCK on both
2241 gst_pad_link_check_compatible_unlocked (GstPad * src, GstPad * sink,
2242 GstPadLinkCheck flags)
2244 GstCaps *srccaps = NULL;
2245 GstCaps *sinkcaps = NULL;
2246 gboolean compatible = FALSE;
2248 if (!(flags & (GST_PAD_LINK_CHECK_CAPS | GST_PAD_LINK_CHECK_TEMPLATE_CAPS)))
2251 /* Doing the expensive caps checking takes priority over only checking the template caps */
2252 if (flags & GST_PAD_LINK_CHECK_CAPS) {
2253 GST_OBJECT_UNLOCK (sink);
2254 GST_OBJECT_UNLOCK (src);
2256 srccaps = gst_pad_query_caps (src, NULL);
2257 sinkcaps = gst_pad_query_caps (sink, NULL);
2259 GST_OBJECT_LOCK (src);
2260 GST_OBJECT_LOCK (sink);
2262 /* If one of the two pads doesn't have a template, consider the intersection
2264 if (G_UNLIKELY ((GST_PAD_PAD_TEMPLATE (src) == NULL)
2265 || (GST_PAD_PAD_TEMPLATE (sink) == NULL))) {
2269 srccaps = gst_caps_ref (GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (src)));
2271 gst_caps_ref (GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (sink)));
2274 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, src, "src caps %" GST_PTR_FORMAT,
2276 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, sink, "sink caps %" GST_PTR_FORMAT,
2279 /* if we have caps on both pads we can check the intersection. If one
2280 * of the caps is %NULL, we return %TRUE. */
2281 if (G_UNLIKELY (srccaps == NULL || sinkcaps == NULL)) {
2283 gst_caps_unref (srccaps);
2285 gst_caps_unref (sinkcaps);
2289 compatible = gst_caps_can_intersect (srccaps, sinkcaps);
2290 gst_caps_unref (srccaps);
2291 gst_caps_unref (sinkcaps);
2294 GST_CAT_DEBUG (GST_CAT_CAPS, "caps are %scompatible",
2295 (compatible ? "" : "not "));
2300 /* check if the grandparents of both pads are the same.
2301 * This check is required so that we don't try to link
2302 * pads from elements in different bins without ghostpads.
2304 * The LOCK should be held on both pads
2307 gst_pad_link_check_hierarchy (GstPad * src, GstPad * sink)
2309 GstObject *psrc, *psink;
2311 psrc = GST_OBJECT_PARENT (src);
2312 psink = GST_OBJECT_PARENT (sink);
2314 /* if one of the pads has no parent, we allow the link */
2315 if (G_UNLIKELY (psrc == NULL || psink == NULL))
2318 /* only care about parents that are elements */
2319 if (G_UNLIKELY (!GST_IS_ELEMENT (psrc) || !GST_IS_ELEMENT (psink)))
2320 goto no_element_parent;
2322 /* if the parents are the same, we have a loop */
2323 if (G_UNLIKELY (psrc == psink))
2326 /* if they both have a parent, we check the grandparents. We can not lock
2327 * the parent because we hold on the child (pad) and the locking order is
2328 * parent >> child. */
2329 psrc = GST_OBJECT_PARENT (psrc);
2330 psink = GST_OBJECT_PARENT (psink);
2332 /* if they have grandparents but they are not the same */
2333 if (G_UNLIKELY (psrc != psink))
2334 goto wrong_grandparents;
2341 GST_CAT_DEBUG (GST_CAT_CAPS,
2342 "one of the pads has no parent %" GST_PTR_FORMAT " and %"
2343 GST_PTR_FORMAT, psrc, psink);
2348 GST_CAT_DEBUG (GST_CAT_CAPS,
2349 "one of the pads has no element parent %" GST_PTR_FORMAT " and %"
2350 GST_PTR_FORMAT, psrc, psink);
2355 GST_CAT_DEBUG (GST_CAT_CAPS, "pads have same parent %" GST_PTR_FORMAT,
2361 GST_CAT_DEBUG (GST_CAT_CAPS,
2362 "pads have different grandparents %" GST_PTR_FORMAT " and %"
2363 GST_PTR_FORMAT, psrc, psink);
2368 /* FIXME leftover from an attempt at refactoring... */
2369 /* call with the two pads unlocked, when this function returns GST_PAD_LINK_OK,
2370 * the two pads will be locked in the srcpad, sinkpad order. */
2371 static GstPadLinkReturn
2372 gst_pad_link_prepare (GstPad * srcpad, GstPad * sinkpad, GstPadLinkCheck flags)
2374 GST_CAT_INFO (GST_CAT_PADS, "trying to link %s:%s and %s:%s",
2375 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
2377 GST_OBJECT_LOCK (srcpad);
2379 if (G_UNLIKELY (GST_PAD_PEER (srcpad) != NULL))
2380 goto src_was_linked;
2382 GST_OBJECT_LOCK (sinkpad);
2384 if (G_UNLIKELY (GST_PAD_PEER (sinkpad) != NULL))
2385 goto sink_was_linked;
2387 /* check hierarchy, pads can only be linked if the grandparents
2389 if ((flags & GST_PAD_LINK_CHECK_HIERARCHY)
2390 && !gst_pad_link_check_hierarchy (srcpad, sinkpad))
2391 goto wrong_hierarchy;
2393 /* check pad caps for non-empty intersection */
2394 if (!gst_pad_link_check_compatible_unlocked (srcpad, sinkpad, flags))
2397 /* FIXME check pad scheduling for non-empty intersection */
2399 return GST_PAD_LINK_OK;
2403 GST_CAT_INFO (GST_CAT_PADS, "src %s:%s was already linked to %s:%s",
2404 GST_DEBUG_PAD_NAME (srcpad),
2405 GST_DEBUG_PAD_NAME (GST_PAD_PEER (srcpad)));
2406 /* we do not emit a warning in this case because unlinking cannot
2407 * be made MT safe.*/
2408 GST_OBJECT_UNLOCK (srcpad);
2409 return GST_PAD_LINK_WAS_LINKED;
2413 GST_CAT_INFO (GST_CAT_PADS, "sink %s:%s was already linked to %s:%s",
2414 GST_DEBUG_PAD_NAME (sinkpad),
2415 GST_DEBUG_PAD_NAME (GST_PAD_PEER (sinkpad)));
2416 /* we do not emit a warning in this case because unlinking cannot
2417 * be made MT safe.*/
2418 GST_OBJECT_UNLOCK (sinkpad);
2419 GST_OBJECT_UNLOCK (srcpad);
2420 return GST_PAD_LINK_WAS_LINKED;
2424 GST_CAT_INFO (GST_CAT_PADS, "pads have wrong hierarchy");
2425 GST_OBJECT_UNLOCK (sinkpad);
2426 GST_OBJECT_UNLOCK (srcpad);
2427 return GST_PAD_LINK_WRONG_HIERARCHY;
2431 GST_CAT_INFO (GST_CAT_PADS, "caps are incompatible");
2432 GST_OBJECT_UNLOCK (sinkpad);
2433 GST_OBJECT_UNLOCK (srcpad);
2434 return GST_PAD_LINK_NOFORMAT;
2440 * @srcpad: the source #GstPad.
2441 * @sinkpad: the sink #GstPad.
2443 * Checks if the source pad and the sink pad are compatible so they can be
2446 * Returns: %TRUE if the pads can be linked.
2449 gst_pad_can_link (GstPad * srcpad, GstPad * sinkpad)
2451 GstPadLinkReturn result;
2453 /* generic checks */
2454 g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
2455 g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
2457 GST_CAT_INFO (GST_CAT_PADS, "check if %s:%s can link with %s:%s",
2458 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
2460 /* gst_pad_link_prepare does everything for us, we only release the locks
2461 * on the pads that it gets us. If this function returns !OK the locks are not
2463 result = gst_pad_link_prepare (srcpad, sinkpad, GST_PAD_LINK_CHECK_DEFAULT);
2464 if (result != GST_PAD_LINK_OK)
2467 GST_OBJECT_UNLOCK (srcpad);
2468 GST_OBJECT_UNLOCK (sinkpad);
2471 return result == GST_PAD_LINK_OK;
2475 * gst_pad_link_full:
2476 * @srcpad: the source #GstPad to link.
2477 * @sinkpad: the sink #GstPad to link.
2478 * @flags: the checks to validate when linking
2480 * Links the source pad and the sink pad.
2482 * This variant of #gst_pad_link provides a more granular control on the
2483 * checks being done when linking. While providing some considerable speedups
2484 * the caller of this method must be aware that wrong usage of those flags
2485 * can cause severe issues. Refer to the documentation of #GstPadLinkCheck
2486 * for more information.
2490 * Returns: A result code indicating if the connection worked or
2494 gst_pad_link_full (GstPad * srcpad, GstPad * sinkpad, GstPadLinkCheck flags)
2496 GstPadLinkReturn result;
2498 GstPadLinkFunction srcfunc, sinkfunc;
2500 g_return_val_if_fail (GST_IS_PAD (srcpad), GST_PAD_LINK_REFUSED);
2501 g_return_val_if_fail (GST_PAD_IS_SRC (srcpad), GST_PAD_LINK_WRONG_DIRECTION);
2502 g_return_val_if_fail (GST_IS_PAD (sinkpad), GST_PAD_LINK_REFUSED);
2503 g_return_val_if_fail (GST_PAD_IS_SINK (sinkpad),
2504 GST_PAD_LINK_WRONG_DIRECTION);
2506 GST_TRACER_PAD_LINK_PRE (srcpad, sinkpad);
2508 /* Notify the parent early. See gst_pad_unlink for details. */
2509 if (G_LIKELY ((parent = GST_ELEMENT_CAST (gst_pad_get_parent (srcpad))))) {
2510 if (G_LIKELY (GST_IS_ELEMENT (parent))) {
2511 gst_element_post_message (parent,
2512 gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
2513 GST_STRUCTURE_CHANGE_TYPE_PAD_LINK, parent, TRUE));
2515 gst_object_unref (parent);
2520 /* prepare will also lock the two pads */
2521 result = gst_pad_link_prepare (srcpad, sinkpad, flags);
2523 if (G_UNLIKELY (result != GST_PAD_LINK_OK)) {
2524 GST_CAT_INFO (GST_CAT_PADS, "link between %s:%s and %s:%s failed: %s",
2525 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad),
2526 gst_pad_link_get_name (result));
2530 /* must set peers before calling the link function */
2531 GST_PAD_PEER (srcpad) = sinkpad;
2532 GST_PAD_PEER (sinkpad) = srcpad;
2534 /* check events, when something is different, mark pending */
2535 schedule_events (srcpad, sinkpad);
2537 /* get the link functions */
2538 srcfunc = GST_PAD_LINKFUNC (srcpad);
2539 sinkfunc = GST_PAD_LINKFUNC (sinkpad);
2541 if (G_UNLIKELY (srcfunc || sinkfunc)) {
2542 /* custom link functions, execute them */
2543 GST_OBJECT_UNLOCK (sinkpad);
2544 GST_OBJECT_UNLOCK (srcpad);
2547 GstObject *tmpparent;
2549 ACQUIRE_PARENT (srcpad, tmpparent, no_parent);
2550 /* this one will call the peer link function */
2551 result = srcfunc (srcpad, tmpparent, sinkpad);
2552 RELEASE_PARENT (tmpparent);
2553 } else if (sinkfunc) {
2554 GstObject *tmpparent;
2556 ACQUIRE_PARENT (sinkpad, tmpparent, no_parent);
2557 /* if no source link function, we need to call the sink link
2558 * function ourselves. */
2559 result = sinkfunc (sinkpad, tmpparent, srcpad);
2560 RELEASE_PARENT (tmpparent);
2564 GST_OBJECT_LOCK (srcpad);
2565 GST_OBJECT_LOCK (sinkpad);
2567 /* we released the lock, check if the same pads are linked still */
2568 if (GST_PAD_PEER (srcpad) != sinkpad || GST_PAD_PEER (sinkpad) != srcpad)
2569 goto concurrent_link;
2571 if (G_UNLIKELY (result != GST_PAD_LINK_OK))
2574 GST_OBJECT_UNLOCK (sinkpad);
2575 GST_OBJECT_UNLOCK (srcpad);
2577 /* fire off a signal to each of the pads telling them
2578 * that they've been linked */
2579 g_signal_emit (srcpad, gst_pad_signals[PAD_LINKED], 0, sinkpad);
2580 g_signal_emit (sinkpad, gst_pad_signals[PAD_LINKED], 0, srcpad);
2582 GST_CAT_INFO (GST_CAT_PADS, "linked %s:%s and %s:%s, successful",
2583 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
2585 if (!(flags & GST_PAD_LINK_CHECK_NO_RECONFIGURE))
2586 gst_pad_send_event (srcpad, gst_event_new_reconfigure ());
2589 if (G_LIKELY (parent)) {
2590 gst_element_post_message (parent,
2591 gst_message_new_structure_change (GST_OBJECT_CAST (sinkpad),
2592 GST_STRUCTURE_CHANGE_TYPE_PAD_LINK, parent, FALSE));
2593 gst_object_unref (parent);
2596 GST_TRACER_PAD_LINK_POST (srcpad, sinkpad, result);
2602 GST_CAT_INFO (GST_CAT_PADS, "concurrent link between %s:%s and %s:%s",
2603 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
2604 GST_OBJECT_UNLOCK (sinkpad);
2605 GST_OBJECT_UNLOCK (srcpad);
2607 /* The other link operation succeeded first */
2608 result = GST_PAD_LINK_WAS_LINKED;
2613 GST_CAT_INFO (GST_CAT_PADS, "link between %s:%s and %s:%s failed: %s",
2614 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad),
2615 gst_pad_link_get_name (result));
2617 GST_PAD_PEER (srcpad) = NULL;
2618 GST_PAD_PEER (sinkpad) = NULL;
2620 GST_OBJECT_UNLOCK (sinkpad);
2621 GST_OBJECT_UNLOCK (srcpad);
2629 * @srcpad: the source #GstPad to link.
2630 * @sinkpad: the sink #GstPad to link.
2632 * Links the source pad and the sink pad.
2634 * Returns: A result code indicating if the connection worked or
2640 gst_pad_link (GstPad * srcpad, GstPad * sinkpad)
2642 return gst_pad_link_full (srcpad, sinkpad, GST_PAD_LINK_CHECK_DEFAULT);
2646 gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ)
2648 GstPadTemplate **template_p;
2650 /* this function would need checks if it weren't static */
2652 GST_OBJECT_LOCK (pad);
2653 template_p = &pad->padtemplate;
2654 gst_object_replace ((GstObject **) template_p, (GstObject *) templ);
2655 GST_OBJECT_UNLOCK (pad);
2658 gst_pad_template_pad_created (templ, pad);
2662 * gst_pad_get_pad_template:
2665 * Gets the template for @pad.
2667 * Returns: (transfer full) (nullable): the #GstPadTemplate from which
2668 * this pad was instantiated, or %NULL if this pad has no
2669 * template. Unref after usage.
2672 gst_pad_get_pad_template (GstPad * pad)
2674 GstPadTemplate *templ;
2676 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2678 templ = GST_PAD_PAD_TEMPLATE (pad);
2680 return (templ ? gst_object_ref (templ) : NULL);
2684 * gst_pad_has_current_caps:
2685 * @pad: a #GstPad to check
2687 * Check if @pad has caps set on it with a #GST_EVENT_CAPS event.
2689 * Returns: %TRUE when @pad has caps associated with it.
2692 gst_pad_has_current_caps (GstPad * pad)
2697 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2699 GST_OBJECT_LOCK (pad);
2700 caps = get_pad_caps (pad);
2701 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
2702 "check current pad caps %" GST_PTR_FORMAT, caps);
2703 result = (caps != NULL);
2704 GST_OBJECT_UNLOCK (pad);
2710 * gst_pad_get_current_caps:
2711 * @pad: a #GstPad to get the current capabilities of.
2713 * Gets the capabilities currently configured on @pad with the last
2714 * #GST_EVENT_CAPS event.
2716 * Returns: (transfer full) (nullable): the current caps of the pad with
2717 * incremented ref-count or %NULL when pad has no caps. Unref after usage.
2720 gst_pad_get_current_caps (GstPad * pad)
2724 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2726 GST_OBJECT_LOCK (pad);
2727 if ((result = get_pad_caps (pad)))
2728 gst_caps_ref (result);
2729 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
2730 "get current pad caps %" GST_PTR_FORMAT, result);
2731 GST_OBJECT_UNLOCK (pad);
2737 * gst_pad_get_pad_template_caps:
2738 * @pad: a #GstPad to get the template capabilities from.
2740 * Gets the capabilities for @pad's template.
2742 * Returns: (transfer full): the #GstCaps of this pad template.
2743 * Unref after usage.
2746 gst_pad_get_pad_template_caps (GstPad * pad)
2748 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2750 if (GST_PAD_PAD_TEMPLATE (pad))
2751 return gst_pad_template_get_caps (GST_PAD_PAD_TEMPLATE (pad));
2753 return gst_caps_ref (GST_CAPS_ANY);
2758 * @pad: a #GstPad to get the peer of.
2760 * Gets the peer of @pad. This function refs the peer pad so
2761 * you need to unref it after use.
2763 * Returns: (transfer full) (nullable): the peer #GstPad. Unref after usage.
2768 gst_pad_get_peer (GstPad * pad)
2772 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2774 GST_OBJECT_LOCK (pad);
2775 result = GST_PAD_PEER (pad);
2777 gst_object_ref (result);
2778 GST_OBJECT_UNLOCK (pad);
2784 * gst_pad_get_allowed_caps:
2787 * Gets the capabilities of the allowed media types that can flow through
2788 * @pad and its peer.
2790 * The allowed capabilities is calculated as the intersection of the results of
2791 * calling gst_pad_query_caps() on @pad and its peer. The caller owns a reference
2792 * on the resulting caps.
2794 * Returns: (transfer full) (nullable): the allowed #GstCaps of the
2795 * pad link. Unref the caps when you no longer need it. This
2796 * function returns %NULL when @pad has no peer.
2801 gst_pad_get_allowed_caps (GstPad * pad)
2804 GstCaps *caps = NULL;
2807 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2809 GST_OBJECT_LOCK (pad);
2810 if (G_UNLIKELY (GST_PAD_PEER (pad) == NULL))
2812 GST_OBJECT_UNLOCK (pad);
2814 GST_CAT_DEBUG_OBJECT (GST_CAT_PROPERTIES, pad, "getting allowed caps");
2816 mycaps = gst_pad_query_caps (pad, NULL);
2818 /* Query peer caps */
2819 query = gst_query_new_caps (mycaps);
2820 if (!gst_pad_peer_query (pad, query)) {
2821 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "Caps query failed");
2825 gst_query_parse_caps_result (query, &caps);
2827 g_warn_if_fail (caps != NULL);
2830 gst_caps_ref (caps);
2832 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "allowed caps %" GST_PTR_FORMAT,
2836 gst_query_unref (query);
2837 gst_caps_unref (mycaps);
2843 GST_CAT_DEBUG_OBJECT (GST_CAT_PROPERTIES, pad, "no peer");
2844 GST_OBJECT_UNLOCK (pad);
2851 * gst_pad_iterate_internal_links_default:
2852 * @pad: the #GstPad to get the internal links of.
2853 * @parent: (allow-none): the parent of @pad or %NULL
2855 * Iterate the list of pads to which the given pad is linked to inside of
2856 * the parent element.
2857 * This is the default handler, and thus returns an iterator of all of the
2858 * pads inside the parent element with opposite direction.
2860 * The caller must free this iterator after use with gst_iterator_free().
2862 * Returns: (nullable): a #GstIterator of #GstPad, or %NULL if @pad
2863 * has no parent. Unref each returned pad with gst_object_unref().
2866 gst_pad_iterate_internal_links_default (GstPad * pad, GstObject * parent)
2873 GstElement *eparent;
2875 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2877 if (parent != NULL && GST_IS_ELEMENT (parent)) {
2878 eparent = GST_ELEMENT_CAST (gst_object_ref (parent));
2880 GST_OBJECT_LOCK (pad);
2881 eparent = GST_PAD_PARENT (pad);
2882 if (!eparent || !GST_IS_ELEMENT (eparent))
2885 gst_object_ref (eparent);
2886 GST_OBJECT_UNLOCK (pad);
2889 if (pad->direction == GST_PAD_SRC)
2890 padlist = &eparent->sinkpads;
2892 padlist = &eparent->srcpads;
2894 GST_DEBUG_OBJECT (pad, "Making iterator");
2896 cookie = &eparent->pads_cookie;
2898 lock = GST_OBJECT_GET_LOCK (eparent);
2900 res = gst_iterator_new_list (GST_TYPE_PAD,
2901 lock, cookie, padlist, (GObject *) owner, NULL);
2903 gst_object_unref (owner);
2910 GST_OBJECT_UNLOCK (pad);
2911 GST_DEBUG_OBJECT (pad, "no parent element");
2917 * gst_pad_iterate_internal_links:
2918 * @pad: the GstPad to get the internal links of.
2920 * Gets an iterator for the pads to which the given pad is linked to inside
2921 * of the parent element.
2923 * Each #GstPad element yielded by the iterator will have its refcount increased,
2924 * so unref after use.
2926 * Free-function: gst_iterator_free
2928 * Returns: (transfer full) (nullable): a new #GstIterator of #GstPad
2929 * or %NULL when the pad does not have an iterator function
2930 * configured. Use gst_iterator_free() after usage.
2933 gst_pad_iterate_internal_links (GstPad * pad)
2935 GstIterator *res = NULL;
2938 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2940 GST_OBJECT_LOCK (pad);
2941 ACQUIRE_PARENT (pad, parent, no_parent);
2942 GST_OBJECT_UNLOCK (pad);
2944 if (GST_PAD_ITERINTLINKFUNC (pad))
2945 res = GST_PAD_ITERINTLINKFUNC (pad) (pad, parent);
2947 RELEASE_PARENT (parent);
2954 GST_DEBUG_OBJECT (pad, "no parent");
2955 GST_OBJECT_UNLOCK (pad);
2963 * @forward: (scope call): a #GstPadForwardFunction
2964 * @user_data: user data passed to @forward
2966 * Calls @forward for all internally linked pads of @pad. This function deals with
2967 * dynamically changing internal pads and will make sure that the @forward
2968 * function is only called once for each pad.
2970 * When @forward returns %TRUE, no further pads will be processed.
2972 * Returns: %TRUE if one of the dispatcher functions returned %TRUE.
2975 gst_pad_forward (GstPad * pad, GstPadForwardFunction forward,
2978 gboolean result = FALSE;
2980 gboolean done = FALSE;
2981 GValue item = { 0, };
2982 GList *pushed_pads = NULL;
2984 iter = gst_pad_iterate_internal_links (pad);
2990 switch (gst_iterator_next (iter, &item)) {
2991 case GST_ITERATOR_OK:
2995 intpad = g_value_get_object (&item);
2997 /* if already pushed, skip. FIXME, find something faster to tag pads */
2998 if (intpad == NULL || g_list_find (pushed_pads, intpad)) {
2999 g_value_reset (&item);
3003 GST_LOG_OBJECT (pad, "calling forward function on pad %s:%s",
3004 GST_DEBUG_PAD_NAME (intpad));
3005 done = result = forward (intpad, user_data);
3007 pushed_pads = g_list_prepend (pushed_pads, intpad);
3009 g_value_reset (&item);
3012 case GST_ITERATOR_RESYNC:
3013 /* We don't reset the result here because we don't push the event
3014 * again on pads that got the event already and because we need
3015 * to consider the result of the previous pushes */
3016 gst_iterator_resync (iter);
3018 case GST_ITERATOR_ERROR:
3019 GST_ERROR_OBJECT (pad, "Could not iterate over internally linked pads");
3022 case GST_ITERATOR_DONE:
3027 g_value_unset (&item);
3028 gst_iterator_free (iter);
3030 g_list_free (pushed_pads);
3040 gboolean dispatched;
3044 event_forward_func (GstPad * pad, EventData * data)
3046 /* for each pad we send to, we should ref the event; it's up
3047 * to downstream to unref again when handled. */
3048 GST_LOG_OBJECT (pad, "Reffing and pushing event %p (%s) to %s:%s",
3049 data->event, GST_EVENT_TYPE_NAME (data->event), GST_DEBUG_PAD_NAME (pad));
3051 data->result |= gst_pad_push_event (pad, gst_event_ref (data->event));
3053 data->dispatched = TRUE;
3060 * gst_pad_event_default:
3061 * @pad: a #GstPad to call the default event handler on.
3062 * @parent: (allow-none): the parent of @pad or %NULL
3063 * @event: (transfer full): the #GstEvent to handle.
3065 * Invokes the default event handler for the given pad.
3067 * The EOS event will pause the task associated with @pad before it is forwarded
3068 * to all internally linked pads,
3070 * The event is sent to all pads internally linked to @pad. This function
3071 * takes ownership of @event.
3073 * Returns: %TRUE if the event was sent successfully.
3076 gst_pad_event_default (GstPad * pad, GstObject * parent, GstEvent * event)
3078 gboolean result, forward = TRUE;
3080 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
3081 g_return_val_if_fail (event != NULL, FALSE);
3083 GST_LOG_OBJECT (pad, "default event handler for event %" GST_PTR_FORMAT,
3086 switch (GST_EVENT_TYPE (event)) {
3087 case GST_EVENT_CAPS:
3088 forward = GST_PAD_IS_PROXY_CAPS (pad);
3099 data.dispatched = FALSE;
3100 data.result = FALSE;
3102 gst_pad_forward (pad, (GstPadForwardFunction) event_forward_func, &data);
3104 /* for sinkpads without a parent element or without internal links, nothing
3105 * will be dispatched but we still want to return TRUE. */
3106 if (data.dispatched)
3107 result = data.result;
3112 gst_event_unref (event);
3117 /* Default accept caps implementation just checks against
3118 * the allowed caps for the pad */
3120 gst_pad_query_accept_caps_default (GstPad * pad, GstQuery * query)
3122 /* get the caps and see if it intersects to something not empty */
3123 GstCaps *caps, *allowed = NULL;
3126 GST_DEBUG_OBJECT (pad, "query accept-caps %" GST_PTR_FORMAT, query);
3128 /* first forward the query to internally linked pads when we are dealing with
3130 if (GST_PAD_IS_PROXY_CAPS (pad)) {
3131 result = gst_pad_proxy_query_accept_caps (pad, query);
3133 allowed = gst_pad_get_pad_template_caps (pad);
3138 gst_query_parse_accept_caps (query, &caps);
3140 if (GST_PAD_IS_ACCEPT_TEMPLATE (pad)) {
3141 allowed = gst_pad_get_pad_template_caps (pad);
3143 GST_CAT_DEBUG_OBJECT (GST_CAT_PERFORMANCE, pad,
3144 "fallback ACCEPT_CAPS query, consider implementing a specialized version");
3145 allowed = gst_pad_query_caps (pad, caps);
3150 if (GST_PAD_IS_ACCEPT_INTERSECT (pad)) {
3151 GST_DEBUG_OBJECT (pad,
3152 "allowed caps intersect %" GST_PTR_FORMAT ", caps %" GST_PTR_FORMAT,
3154 result = gst_caps_can_intersect (caps, allowed);
3156 GST_DEBUG_OBJECT (pad, "allowed caps subset %" GST_PTR_FORMAT ", caps %"
3157 GST_PTR_FORMAT, allowed, caps);
3158 result = gst_caps_is_subset (caps, allowed);
3160 gst_caps_unref (allowed);
3162 GST_DEBUG_OBJECT (pad, "no compatible caps allowed on the pad");
3165 gst_query_set_accept_caps_result (query, result);
3171 /* Default caps implementation */
3173 gst_pad_query_caps_default (GstPad * pad, GstQuery * query)
3175 GstCaps *result = NULL, *filter;
3176 GstPadTemplate *templ;
3177 gboolean fixed_caps;
3179 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "query caps %" GST_PTR_FORMAT,
3182 /* first try to proxy if we must */
3183 if (GST_PAD_IS_PROXY_CAPS (pad)) {
3184 if ((gst_pad_proxy_query_caps (pad, query))) {
3189 gst_query_parse_caps (query, &filter);
3191 /* no proxy or it failed, do default handling */
3192 fixed_caps = GST_PAD_IS_FIXED_CAPS (pad);
3194 GST_OBJECT_LOCK (pad);
3196 /* fixed caps, try the negotiated caps first */
3197 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "fixed pad caps: trying pad caps");
3198 if ((result = get_pad_caps (pad)))
3199 goto filter_done_unlock;
3202 if ((templ = GST_PAD_PAD_TEMPLATE (pad))) {
3203 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "trying pad template caps");
3204 if ((result = GST_PAD_TEMPLATE_CAPS (templ)))
3205 goto filter_done_unlock;
3209 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
3210 "non-fixed pad caps: trying pad caps");
3211 /* non fixed caps, try the negotiated caps */
3212 if ((result = get_pad_caps (pad)))
3213 goto filter_done_unlock;
3216 /* this almost never happens */
3217 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "pad has no caps");
3218 result = GST_CAPS_ANY;
3221 GST_OBJECT_UNLOCK (pad);
3223 /* run the filter on the result */
3225 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
3226 "using caps %p %" GST_PTR_FORMAT " with filter %p %"
3227 GST_PTR_FORMAT, result, result, filter, filter);
3228 result = gst_caps_intersect_full (filter, result, GST_CAPS_INTERSECT_FIRST);
3229 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad, "result %p %" GST_PTR_FORMAT,
3232 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
3233 "using caps %p %" GST_PTR_FORMAT, result, result);
3234 result = gst_caps_ref (result);
3236 gst_query_set_caps_result (query, result);
3237 gst_caps_unref (result);
3243 /* Default latency implementation */
3248 GstClockTime min, max;
3252 query_latency_default_fold (const GValue * item, GValue * ret,
3255 GstPad *pad = g_value_get_object (item), *peer;
3256 LatencyFoldData *fold_data = user_data;
3258 gboolean res = FALSE;
3260 query = gst_query_new_latency ();
3262 peer = gst_pad_get_peer (pad);
3264 res = gst_pad_peer_query (pad, query);
3266 GST_LOG_OBJECT (pad, "No peer pad found, ignoring this pad");
3271 GstClockTime min, max;
3273 gst_query_parse_latency (query, &live, &min, &max);
3275 GST_LOG_OBJECT (pad, "got latency live:%s min:%" G_GINT64_FORMAT
3276 " max:%" G_GINT64_FORMAT, live ? "true" : "false", min, max);
3278 /* FIXME : Why do we only take values into account if it's live ? */
3279 if (live || fold_data->count == 0) {
3280 if (min > fold_data->min)
3281 fold_data->min = min;
3283 if (fold_data->max == GST_CLOCK_TIME_NONE)
3284 fold_data->max = max;
3285 else if (max < fold_data->max)
3286 fold_data->max = max;
3288 fold_data->live = live;
3290 fold_data->count += 1;
3292 GST_DEBUG_OBJECT (pad, "latency query failed");
3293 g_value_set_boolean (ret, FALSE);
3296 gst_query_unref (query);
3298 gst_object_unref (peer);
3304 gst_pad_query_latency_default (GstPad * pad, GstQuery * query)
3307 GstIteratorResult res;
3308 GValue ret = G_VALUE_INIT;
3310 LatencyFoldData fold_data;
3312 it = gst_pad_iterate_internal_links (pad);
3314 GST_DEBUG_OBJECT (pad, "Can't iterate internal links");
3318 g_value_init (&ret, G_TYPE_BOOLEAN);
3321 fold_data.count = 0;
3322 fold_data.live = FALSE;
3324 fold_data.max = GST_CLOCK_TIME_NONE;
3326 g_value_set_boolean (&ret, TRUE);
3327 res = gst_iterator_fold (it, query_latency_default_fold, &ret, &fold_data);
3329 case GST_ITERATOR_OK:
3330 g_assert_not_reached ();
3332 case GST_ITERATOR_DONE:
3334 case GST_ITERATOR_ERROR:
3335 g_value_set_boolean (&ret, FALSE);
3337 case GST_ITERATOR_RESYNC:
3338 gst_iterator_resync (it);
3341 g_assert_not_reached ();
3344 gst_iterator_free (it);
3346 query_ret = g_value_get_boolean (&ret);
3348 GST_LOG_OBJECT (pad, "got latency live:%s min:%" G_GINT64_FORMAT
3349 " max:%" G_GINT64_FORMAT, fold_data.live ? "true" : "false",
3350 fold_data.min, fold_data.max);
3352 if (fold_data.min > fold_data.max) {
3353 GST_ERROR_OBJECT (pad, "minimum latency bigger than maximum latency");
3356 gst_query_set_latency (query, fold_data.live, fold_data.min, fold_data.max);
3358 GST_LOG_OBJECT (pad, "latency query failed");
3368 gboolean dispatched;
3372 query_forward_func (GstPad * pad, QueryData * data)
3374 GST_LOG_OBJECT (pad, "query peer %p (%s) of %s:%s",
3375 data->query, GST_QUERY_TYPE_NAME (data->query), GST_DEBUG_PAD_NAME (pad));
3377 data->result |= gst_pad_peer_query (pad, data->query);
3379 data->dispatched = TRUE;
3381 /* stop on first successful reply */
3382 return data->result;
3386 * gst_pad_query_default:
3387 * @pad: a #GstPad to call the default query handler on.
3388 * @parent: (allow-none): the parent of @pad or %NULL
3389 * @query: (transfer none): the #GstQuery to handle.
3391 * Invokes the default query handler for the given pad.
3392 * The query is sent to all pads internally linked to @pad. Note that
3393 * if there are many possible sink pads that are internally linked to
3394 * @pad, only one will be sent the query.
3395 * Multi-sinkpad elements should implement custom query handlers.
3397 * Returns: %TRUE if the query was performed successfully.
3400 gst_pad_query_default (GstPad * pad, GstObject * parent, GstQuery * query)
3402 gboolean forward, ret = FALSE;
3404 switch (GST_QUERY_TYPE (query)) {
3405 case GST_QUERY_SCHEDULING:
3406 forward = GST_PAD_IS_PROXY_SCHEDULING (pad);
3408 case GST_QUERY_ALLOCATION:
3409 forward = GST_PAD_IS_PROXY_ALLOCATION (pad);
3411 case GST_QUERY_ACCEPT_CAPS:
3412 ret = gst_pad_query_accept_caps_default (pad, query);
3415 case GST_QUERY_CAPS:
3416 ret = gst_pad_query_caps_default (pad, query);
3419 case GST_QUERY_LATENCY:
3420 ret = gst_pad_query_latency_default (pad, query);
3423 case GST_QUERY_POSITION:
3424 case GST_QUERY_SEEKING:
3425 case GST_QUERY_FORMATS:
3426 case GST_QUERY_JITTER:
3427 case GST_QUERY_RATE:
3428 case GST_QUERY_CONVERT:
3434 GST_DEBUG_OBJECT (pad, "%sforwarding %p (%s) query", (forward ? "" : "not "),
3435 query, GST_QUERY_TYPE_NAME (query));
3441 data.dispatched = FALSE;
3442 data.result = FALSE;
3444 gst_pad_forward (pad, (GstPadForwardFunction) query_forward_func, &data);
3446 if (data.dispatched) {
3449 /* nothing dispatched, assume drained */
3450 if (GST_QUERY_TYPE (query) == GST_QUERY_DRAIN)
3459 #define N_STACK_ALLOCATE_PROBES (16)
3462 probe_hook_marshal (GHook * hook, ProbeMarshall * data)
3464 GstPad *pad = data->pad;
3465 GstPadProbeInfo *info = data->info;
3466 GstPadProbeType type, flags;
3467 GstPadProbeCallback callback;
3468 GstPadProbeReturn ret;
3469 gpointer original_data;
3472 /* if we have called this callback, do nothing. But only check
3473 * if we're actually calling probes a second time */
3475 for (i = 0; i < data->n_called_probes; i++) {
3476 if (data->called_probes[i] == hook) {
3477 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3478 "hook %lu already called", hook->hook_id);
3484 /* reallocate on the heap if we had more than 16 probes */
3485 if (data->n_called_probes == data->called_probes_size) {
3486 if (data->called_probes_size > N_STACK_ALLOCATE_PROBES) {
3487 data->called_probes_size *= 2;
3488 data->called_probes =
3489 g_renew (GHook *, data->called_probes, data->called_probes_size);
3491 GHook **tmp = data->called_probes;
3493 data->called_probes_size *= 2;
3494 data->called_probes = g_new (GHook *, data->called_probes_size);
3495 memcpy (data->called_probes, tmp,
3496 N_STACK_ALLOCATE_PROBES * sizeof (GHook *));
3499 data->called_probes[data->n_called_probes++] = hook;
3501 flags = hook->flags >> G_HOOK_FLAG_USER_SHIFT;
3503 original_data = info->data;
3505 /* one of the scheduling types */
3506 if ((flags & GST_PAD_PROBE_TYPE_SCHEDULING & type) == 0)
3509 if (G_UNLIKELY (data->handled)) {
3510 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3511 "probe previously returned HANDLED, not calling again");
3513 } else if (G_UNLIKELY (data->dropped)) {
3514 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3515 "probe previously returned DROPPED, not calling again");
3519 if (type & GST_PAD_PROBE_TYPE_PUSH) {
3520 /* one of the data types for non-idle probes */
3521 if ((type & GST_PAD_PROBE_TYPE_IDLE) == 0
3522 && (flags & _PAD_PROBE_TYPE_ALL_BOTH_AND_FLUSH & type) == 0)
3524 } else if (type & GST_PAD_PROBE_TYPE_PULL) {
3525 /* one of the data types for non-idle probes */
3526 if ((type & GST_PAD_PROBE_TYPE_BLOCKING) == 0
3527 && (flags & _PAD_PROBE_TYPE_ALL_BOTH_AND_FLUSH & type) == 0)
3530 /* Type must have PULL or PUSH probe types */
3531 g_assert_not_reached ();
3534 /* one of the blocking types must match */
3535 if ((type & GST_PAD_PROBE_TYPE_BLOCKING) &&
3536 (flags & GST_PAD_PROBE_TYPE_BLOCKING & type) == 0)
3538 if ((type & GST_PAD_PROBE_TYPE_BLOCKING) == 0 &&
3539 (flags & GST_PAD_PROBE_TYPE_BLOCKING))
3541 /* only probes that have GST_PAD_PROBE_TYPE_EVENT_FLUSH set */
3542 if ((type & GST_PAD_PROBE_TYPE_EVENT_FLUSH) &&
3543 (flags & GST_PAD_PROBE_TYPE_EVENT_FLUSH & type) == 0)
3546 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3547 "hook %lu with flags 0x%08x matches", hook->hook_id, flags);
3549 data->marshalled = TRUE;
3551 callback = (GstPadProbeCallback) hook->func;
3552 if (callback == NULL)
3555 info->id = hook->hook_id;
3557 GST_OBJECT_UNLOCK (pad);
3559 ret = callback (pad, info, hook->data);
3561 GST_OBJECT_LOCK (pad);
3563 if (original_data != NULL && info->data == NULL) {
3564 GST_DEBUG_OBJECT (pad, "data item in pad probe info was dropped");
3565 info->type = GST_PAD_PROBE_TYPE_INVALID;
3566 data->dropped = TRUE;
3570 case GST_PAD_PROBE_REMOVE:
3571 /* remove the probe */
3572 GST_DEBUG_OBJECT (pad, "asked to remove hook");
3573 cleanup_hook (pad, hook);
3575 case GST_PAD_PROBE_DROP:
3576 /* need to drop the data, make sure other probes don't get called
3578 GST_DEBUG_OBJECT (pad, "asked to drop item");
3579 info->type = GST_PAD_PROBE_TYPE_INVALID;
3580 data->dropped = TRUE;
3582 case GST_PAD_PROBE_HANDLED:
3583 GST_DEBUG_OBJECT (pad, "probe handled data");
3584 data->handled = TRUE;
3586 case GST_PAD_PROBE_PASS:
3587 /* inform the pad block to let things pass */
3588 GST_DEBUG_OBJECT (pad, "asked to pass item");
3591 case GST_PAD_PROBE_OK:
3592 GST_DEBUG_OBJECT (pad, "probe returned OK");
3595 GST_DEBUG_OBJECT (pad, "probe returned %d", ret);
3602 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3603 "hook %lu with flags 0x%08x does not match %08x",
3604 hook->hook_id, flags, info->type);
3609 /* a probe that does not take or return any data */
3610 #define PROBE_NO_DATA(pad,mask,label,defaultval) \
3612 if (G_UNLIKELY (pad->num_probes)) { \
3613 GstFlowReturn pval = defaultval; \
3614 /* pass NULL as the data item */ \
3615 GstPadProbeInfo info = { mask, 0, NULL, 0, 0 }; \
3616 info.ABI.abi.flow_ret = defaultval; \
3617 ret = do_probe_callbacks (pad, &info, defaultval); \
3618 if (G_UNLIKELY (ret != pval && ret != GST_FLOW_OK)) \
3623 #define PROBE_FULL(pad,mask,data,offs,size,label,handleable,handle_label) \
3625 if (G_UNLIKELY (pad->num_probes)) { \
3626 /* pass the data item */ \
3627 GstPadProbeInfo info = { mask, 0, data, offs, size }; \
3628 info.ABI.abi.flow_ret = GST_FLOW_OK; \
3629 ret = do_probe_callbacks (pad, &info, GST_FLOW_OK); \
3630 /* store the possibly updated data item */ \
3631 data = GST_PAD_PROBE_INFO_DATA (&info); \
3632 /* if something went wrong, exit */ \
3633 if (G_UNLIKELY (ret != GST_FLOW_OK)) { \
3634 if (handleable && ret == GST_FLOW_CUSTOM_SUCCESS_1) { \
3635 ret = info.ABI.abi.flow_ret; \
3636 goto handle_label; \
3643 #define PROBE_PUSH(pad,mask,data,label) \
3644 PROBE_FULL(pad, mask, data, -1, -1, label, FALSE, label);
3645 #define PROBE_HANDLE(pad,mask,data,label,handle_label) \
3646 PROBE_FULL(pad, mask, data, -1, -1, label, TRUE, handle_label);
3647 #define PROBE_PULL(pad,mask,data,offs,size,label) \
3648 PROBE_FULL(pad, mask, data, offs, size, label, FALSE, label);
3650 static GstFlowReturn
3651 do_pad_idle_probe_wait (GstPad * pad)
3653 while (GST_PAD_IS_RUNNING_IDLE_PROBE (pad)) {
3654 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3655 "waiting idle probe to be removed");
3656 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_BLOCKING);
3657 GST_PAD_BLOCK_WAIT (pad);
3658 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_BLOCKING);
3659 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "We got unblocked");
3661 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
3662 return GST_FLOW_FLUSHING;
3667 #define PROBE_TYPE_IS_SERIALIZED(i) \
3670 (((i)->type & (GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM | \
3671 GST_PAD_PROBE_TYPE_EVENT_FLUSH)) && \
3672 GST_EVENT_IS_SERIALIZED ((i)->data)) \
3674 (((i)->type & GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM) && \
3675 GST_QUERY_IS_SERIALIZED ((i)->data)) \
3677 ((i)->type & (GST_PAD_PROBE_TYPE_BUFFER | \
3678 GST_PAD_PROBE_TYPE_BUFFER_LIST)) \
3682 static GstFlowReturn
3683 do_probe_callbacks (GstPad * pad, GstPadProbeInfo * info,
3684 GstFlowReturn defaultval)
3689 GHook *called_probes[N_STACK_ALLOCATE_PROBES];
3694 data.handled = FALSE;
3695 data.marshalled = FALSE;
3696 data.dropped = FALSE;
3698 /* We stack-allocate for N_STACK_ALLOCATE_PROBES hooks as a first step. If more are needed,
3699 * we will re-allocate with g_malloc(). This should usually never be needed
3701 data.called_probes = called_probes;
3702 data.n_called_probes = 0;
3703 data.called_probes_size = N_STACK_ALLOCATE_PROBES;
3707 (info->type & GST_PAD_PROBE_TYPE_BLOCK) == GST_PAD_PROBE_TYPE_BLOCK;
3709 if (is_block && PROBE_TYPE_IS_SERIALIZED (info)) {
3710 if (do_pad_idle_probe_wait (pad) == GST_FLOW_FLUSHING)
3715 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "do probes");
3716 cookie = pad->priv->probe_list_cookie;
3718 g_hook_list_marshal (&pad->probes, TRUE,
3719 (GHookMarshaller) probe_hook_marshal, &data);
3721 /* if the list changed, call the new callbacks (they will not be in
3722 * called_probes yet) */
3723 if (cookie != pad->priv->probe_list_cookie) {
3724 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3725 "probe list changed, restarting");
3730 /* the first item that dropped will stop the hooks and then we drop here */
3734 /* If one handler took care of it, let the the item pass */
3739 /* if no handler matched and we are blocking, let the item pass */
3740 if (!data.marshalled && is_block)
3743 /* At this point, all handlers returned either OK or PASS. If one handler
3744 * returned PASS, let the item pass */
3749 while (GST_PAD_IS_BLOCKED (pad)) {
3750 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3751 "we are blocked %d times", pad->num_blocked);
3753 /* we might have released the lock */
3754 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
3757 /* now we block the streaming thread. It can be unlocked when we
3758 * deactivate the pad (which will also set the FLUSHING flag) or
3759 * when the pad is unblocked. A flushing event will also unblock
3760 * the pad after setting the FLUSHING flag. */
3761 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3762 "Waiting to be unblocked or set flushing");
3763 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_BLOCKING);
3764 GST_PAD_BLOCK_WAIT (pad);
3765 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_BLOCKING);
3766 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "We got unblocked");
3768 /* if the list changed, call the new callbacks (they will not be in
3769 * called_probes yet) */
3770 if (cookie != pad->priv->probe_list_cookie) {
3771 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
3772 "probe list changed, restarting");
3777 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
3782 if (data.called_probes_size > N_STACK_ALLOCATE_PROBES)
3783 g_free (data.called_probes);
3790 GST_DEBUG_OBJECT (pad, "pad is flushing");
3791 if (data.called_probes_size > N_STACK_ALLOCATE_PROBES)
3792 g_free (data.called_probes);
3793 return GST_FLOW_FLUSHING;
3797 GST_DEBUG_OBJECT (pad, "data is dropped");
3798 if (data.called_probes_size > N_STACK_ALLOCATE_PROBES)
3799 g_free (data.called_probes);
3800 return GST_FLOW_CUSTOM_SUCCESS;
3804 /* FIXME : Should we return FLOW_OK or the defaultval ?? */
3805 GST_DEBUG_OBJECT (pad, "data is passed");
3806 if (data.called_probes_size > N_STACK_ALLOCATE_PROBES)
3807 g_free (data.called_probes);
3812 GST_DEBUG_OBJECT (pad, "data was handled");
3813 if (data.called_probes_size > N_STACK_ALLOCATE_PROBES)
3814 g_free (data.called_probes);
3815 return GST_FLOW_CUSTOM_SUCCESS_1;
3822 * gst_pad_get_offset:
3825 * Get the offset applied to the running time of @pad. @pad has to be a source
3828 * Returns: the offset.
3831 gst_pad_get_offset (GstPad * pad)
3835 g_return_val_if_fail (GST_IS_PAD (pad), 0);
3837 GST_OBJECT_LOCK (pad);
3838 result = pad->offset;
3839 GST_OBJECT_UNLOCK (pad);
3844 /* This function will make sure that previously set offset is
3845 * reverted as otherwise we would end up applying the new offset
3846 * on top of the previously set one, which is not what we want.
3847 * The event is also marked as not received. */
3849 reschedule_event (GstPad * pad, PadEvent * ev, gint64 * prev_offset)
3851 if (*prev_offset != 0)
3852 ev->event = _apply_pad_offset (pad, ev->event, -*prev_offset, FALSE);
3854 ev->received = FALSE;
3859 * gst_pad_set_offset:
3861 * @offset: the offset
3863 * Set the offset that will be applied to the running time of @pad.
3866 gst_pad_set_offset (GstPad * pad, gint64 offset)
3869 g_return_if_fail (GST_IS_PAD (pad));
3871 GST_OBJECT_LOCK (pad);
3872 /* if nothing changed, do nothing */
3873 if (pad->offset == offset)
3876 prev_offset = pad->offset;
3877 pad->offset = offset;
3878 GST_DEBUG_OBJECT (pad, "changed offset to %" GST_STIME_FORMAT,
3879 GST_STIME_ARGS (offset));
3881 /* resend all sticky events with updated offset on next buffer push */
3882 events_foreach (pad, (PadEventFunction) reschedule_event, &prev_offset);
3883 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3887 GST_OBJECT_UNLOCK (pad);
3894 /* If TRUE and ret is not OK this means
3895 * that pushing the EOS event failed
3899 /* If called for an event this is
3900 * the event that would be pushed
3901 * next. Don't forward sticky events
3902 * that would come after that */
3906 /* should be called with pad LOCK */
3908 push_sticky (GstPad * pad, PadEvent * ev, gpointer user_data)
3910 PushStickyData *data = user_data;
3911 GstEvent *event = ev->event;
3914 GST_DEBUG_OBJECT (pad, "event %s was already received",
3915 GST_EVENT_TYPE_NAME (event));
3919 /* If we're called because of an sticky event, only forward
3920 * events that would come before this new event and the
3922 if (data->event && GST_EVENT_IS_STICKY (data->event) &&
3923 GST_EVENT_TYPE (data->event) <= GST_EVENT_SEGMENT &&
3924 GST_EVENT_TYPE (data->event) < GST_EVENT_TYPE (event)) {
3925 data->ret = GST_FLOW_CUSTOM_SUCCESS_1;
3927 gst_event_ref (event);
3928 data->ret = gst_pad_push_event_unchecked (pad, &event,
3929 GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM);
3930 gst_event_replace (&ev->event, event);
3931 if (data->ret == GST_FLOW_CUSTOM_SUCCESS_1)
3932 data->ret = GST_FLOW_OK;
3935 switch (data->ret) {
3937 ev->received = TRUE;
3938 GST_DEBUG_OBJECT (pad, "event %s marked received",
3939 GST_EVENT_TYPE_NAME (event));
3941 case GST_FLOW_CUSTOM_SUCCESS:
3942 /* we can't assume the event is received when it was dropped */
3943 GST_DEBUG_OBJECT (pad, "event %s was dropped, mark pending",
3944 GST_EVENT_TYPE_NAME (event));
3945 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3946 data->ret = GST_FLOW_OK;
3948 case GST_FLOW_CUSTOM_SUCCESS_1:
3949 /* event was ignored and should be sent later */
3950 GST_DEBUG_OBJECT (pad, "event %s was ignored, mark pending",
3951 GST_EVENT_TYPE_NAME (event));
3952 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3953 data->ret = GST_FLOW_OK;
3955 case GST_FLOW_NOT_LINKED:
3956 /* not linked is not a problem, we are sticky so the event will be
3957 * rescheduled to be sent later on re-link, but only for non-EOS events */
3958 GST_DEBUG_OBJECT (pad, "pad was not linked, mark pending");
3959 if (GST_EVENT_TYPE (event) != GST_EVENT_EOS) {
3960 data->ret = GST_FLOW_OK;
3961 ev->received = TRUE;
3965 GST_DEBUG_OBJECT (pad, "result %s, mark pending events",
3966 gst_flow_get_name (data->ret));
3967 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3971 if (data->ret != GST_FLOW_OK && GST_EVENT_TYPE (event) == GST_EVENT_EOS)
3972 data->was_eos = TRUE;
3974 return data->ret == GST_FLOW_OK;
3977 /* check sticky events and push them when needed. should be called
3979 static inline GstFlowReturn
3980 check_sticky (GstPad * pad, GstEvent * event)
3982 PushStickyData data = { GST_FLOW_OK, FALSE, event };
3984 if (G_UNLIKELY (GST_PAD_HAS_PENDING_EVENTS (pad))) {
3985 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PENDING_EVENTS);
3987 GST_DEBUG_OBJECT (pad, "pushing all sticky events");
3988 events_foreach (pad, push_sticky, &data);
3990 /* If there's an EOS event we must push it downstream
3991 * even if sending a previous sticky event failed.
3992 * Otherwise the pipeline might wait forever for EOS.
3994 * Only do this if pushing another event than the EOS
3997 if (data.ret != GST_FLOW_OK && !data.was_eos) {
3998 PadEvent *ev = find_event_by_type (pad, GST_EVENT_EOS, 0);
4000 if (ev && !ev->received) {
4001 gst_event_ref (ev->event);
4002 data.ret = gst_pad_push_event_unchecked (pad, &ev->event,
4003 GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM);
4004 /* the event could have been dropped. Because this can only
4005 * happen if the user asked for it, it's not an error */
4006 if (data.ret == GST_FLOW_CUSTOM_SUCCESS)
4007 data.ret = GST_FLOW_OK;
4017 * @pad: a #GstPad to invoke the default query on.
4018 * @query: (transfer none): the #GstQuery to perform.
4020 * Dispatches a query to a pad. The query should have been allocated by the
4021 * caller via one of the type-specific allocation functions. The element that
4022 * the pad belongs to is responsible for filling the query with an appropriate
4023 * response, which should then be parsed with a type-specific query parsing
4026 * Again, the caller is responsible for both the allocation and deallocation of
4027 * the query structure.
4029 * Please also note that some queries might need a running pipeline to work.
4031 * Returns: %TRUE if the query could be performed.
4034 gst_pad_query (GstPad * pad, GstQuery * query)
4037 gboolean res, serialized;
4038 GstPadQueryFunction func;
4039 GstPadProbeType type;
4042 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
4043 g_return_val_if_fail (GST_IS_QUERY (query), FALSE);
4045 if (GST_PAD_IS_SRC (pad)) {
4046 if (G_UNLIKELY (!GST_QUERY_IS_UPSTREAM (query)))
4047 goto wrong_direction;
4048 type = GST_PAD_PROBE_TYPE_QUERY_UPSTREAM;
4049 } else if (GST_PAD_IS_SINK (pad)) {
4050 if (G_UNLIKELY (!GST_QUERY_IS_DOWNSTREAM (query)))
4051 goto wrong_direction;
4052 type = GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM;
4054 goto unknown_direction;
4056 GST_DEBUG_OBJECT (pad, "doing query %p (%s)", query,
4057 GST_QUERY_TYPE_NAME (query));
4058 GST_TRACER_PAD_QUERY_PRE (pad, query);
4060 serialized = GST_QUERY_IS_SERIALIZED (query);
4061 if (G_UNLIKELY (serialized))
4062 GST_PAD_STREAM_LOCK (pad);
4064 GST_OBJECT_LOCK (pad);
4065 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH |
4066 GST_PAD_PROBE_TYPE_BLOCK, query, probe_stopped);
4067 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH, query, probe_stopped);
4069 ACQUIRE_PARENT (pad, parent, no_parent);
4070 GST_OBJECT_UNLOCK (pad);
4072 if ((func = GST_PAD_QUERYFUNC (pad)) == NULL)
4075 res = func (pad, parent, query);
4077 RELEASE_PARENT (parent);
4079 GST_DEBUG_OBJECT (pad, "sent query %p (%s), result %d", query,
4080 GST_QUERY_TYPE_NAME (query), res);
4081 GST_TRACER_PAD_QUERY_POST (pad, query, res);
4086 GST_OBJECT_LOCK (pad);
4087 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PULL, query, probe_stopped);
4088 GST_OBJECT_UNLOCK (pad);
4090 if (G_UNLIKELY (serialized))
4091 GST_PAD_STREAM_UNLOCK (pad);
4098 g_warning ("pad %s:%s query %s in wrong direction",
4099 GST_DEBUG_PAD_NAME (pad), GST_QUERY_TYPE_NAME (query));
4104 g_warning ("pad %s:%s has invalid direction", GST_DEBUG_PAD_NAME (pad));
4109 GST_DEBUG_OBJECT (pad, "had no parent");
4110 GST_OBJECT_UNLOCK (pad);
4111 if (G_UNLIKELY (serialized))
4112 GST_PAD_STREAM_UNLOCK (pad);
4117 GST_DEBUG_OBJECT (pad, "had no query function");
4118 RELEASE_PARENT (parent);
4119 if (G_UNLIKELY (serialized))
4120 GST_PAD_STREAM_UNLOCK (pad);
4125 GST_DEBUG_OBJECT (pad, "query failed");
4126 if (G_UNLIKELY (serialized))
4127 GST_PAD_STREAM_UNLOCK (pad);
4132 GST_DEBUG_OBJECT (pad, "probe stopped: %s", gst_flow_get_name (ret));
4133 GST_OBJECT_UNLOCK (pad);
4134 if (G_UNLIKELY (serialized))
4135 GST_PAD_STREAM_UNLOCK (pad);
4137 /* if a probe dropped without handling, we don't sent it further but assume
4138 * that the probe did not answer the query and return FALSE */
4139 if (ret != GST_FLOW_CUSTOM_SUCCESS_1)
4149 * gst_pad_peer_query:
4150 * @pad: a #GstPad to invoke the peer query on.
4151 * @query: (transfer none): the #GstQuery to perform.
4153 * Performs gst_pad_query() on the peer of @pad.
4155 * The caller is responsible for both the allocation and deallocation of
4156 * the query structure.
4158 * Returns: %TRUE if the query could be performed. This function returns %FALSE
4159 * if @pad has no peer.
4162 gst_pad_peer_query (GstPad * pad, GstQuery * query)
4165 GstPadProbeType type;
4166 gboolean res, serialized;
4169 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
4170 g_return_val_if_fail (GST_IS_QUERY (query), FALSE);
4172 if (GST_PAD_IS_SRC (pad)) {
4173 if (G_UNLIKELY (!GST_QUERY_IS_DOWNSTREAM (query)))
4174 goto wrong_direction;
4175 type = GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM;
4176 } else if (GST_PAD_IS_SINK (pad)) {
4177 if (G_UNLIKELY (!GST_QUERY_IS_UPSTREAM (query)))
4178 goto wrong_direction;
4179 type = GST_PAD_PROBE_TYPE_QUERY_UPSTREAM;
4181 goto unknown_direction;
4183 GST_DEBUG_OBJECT (pad, "peer query %p (%s)", query,
4184 GST_QUERY_TYPE_NAME (query));
4186 serialized = GST_QUERY_IS_SERIALIZED (query);
4188 GST_OBJECT_LOCK (pad);
4189 if (GST_PAD_IS_SRC (pad) && serialized) {
4190 /* all serialized queries on the srcpad trigger push of
4192 if (check_sticky (pad, NULL) != GST_FLOW_OK)
4196 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH |
4197 GST_PAD_PROBE_TYPE_BLOCK, query, probe_stopped);
4198 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH, query, probe_stopped);
4200 peerpad = GST_PAD_PEER (pad);
4201 if (G_UNLIKELY (peerpad == NULL))
4204 gst_object_ref (peerpad);
4205 GST_OBJECT_UNLOCK (pad);
4207 res = gst_pad_query (peerpad, query);
4209 gst_object_unref (peerpad);
4214 GST_OBJECT_LOCK (pad);
4215 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PULL, query, probe_stopped);
4216 GST_OBJECT_UNLOCK (pad);
4223 g_warning ("pad %s:%s query %s in wrong direction",
4224 GST_DEBUG_PAD_NAME (pad), GST_QUERY_TYPE_NAME (query));
4229 g_warning ("pad %s:%s has invalid direction", GST_DEBUG_PAD_NAME (pad));
4234 GST_WARNING_OBJECT (pad, "could not send sticky events");
4235 GST_OBJECT_UNLOCK (pad);
4240 GST_INFO_OBJECT (pad, "pad has no peer");
4241 GST_OBJECT_UNLOCK (pad);
4246 GST_DEBUG_OBJECT (pad, "query failed");
4251 GST_DEBUG_OBJECT (pad, "probe stopped: %s", gst_flow_get_name (ret));
4252 GST_OBJECT_UNLOCK (pad);
4254 /* if a probe dropped without handling, we don't sent it further but
4255 * assume that the probe did not answer the query and return FALSE */
4256 if (ret != GST_FLOW_CUSTOM_SUCCESS_1)
4265 /**********************************************************************
4266 * Data passing functions
4269 /* this is the chain function that does not perform the additional argument
4270 * checking for that little extra speed.
4272 static inline GstFlowReturn
4273 gst_pad_chain_data_unchecked (GstPad * pad, GstPadProbeType type, void *data)
4277 gboolean handled = FALSE;
4279 GST_PAD_STREAM_LOCK (pad);
4281 GST_OBJECT_LOCK (pad);
4282 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
4285 if (G_UNLIKELY (GST_PAD_IS_EOS (pad)))
4288 if (G_UNLIKELY (GST_PAD_MODE (pad) != GST_PAD_MODE_PUSH))
4291 #ifdef GST_ENABLE_EXTRA_CHECKS
4292 if (G_UNLIKELY (pad->priv->last_cookie != pad->priv->events_cookie)) {
4293 if (!find_event_by_type (pad, GST_EVENT_STREAM_START, 0)) {
4295 ":%s:<%s:%s> Got data flow before stream-start event",
4296 G_STRFUNC, GST_DEBUG_PAD_NAME (pad));
4298 if (!find_event_by_type (pad, GST_EVENT_SEGMENT, 0)) {
4300 ":%s:<%s:%s> Got data flow before segment event",
4301 G_STRFUNC, GST_DEBUG_PAD_NAME (pad));
4303 pad->priv->last_cookie = pad->priv->events_cookie;
4307 PROBE_HANDLE (pad, type | GST_PAD_PROBE_TYPE_BLOCK, data, probe_stopped,
4310 PROBE_HANDLE (pad, type, data, probe_stopped, probe_handled);
4312 ACQUIRE_PARENT (pad, parent, no_parent);
4313 GST_OBJECT_UNLOCK (pad);
4315 /* NOTE: we read the chainfunc unlocked.
4316 * we cannot hold the lock for the pad so we might send
4317 * the data to the wrong function. This is not really a
4318 * problem since functions are assigned at creation time
4319 * and don't change that often... */
4320 if (G_LIKELY (type & GST_PAD_PROBE_TYPE_BUFFER)) {
4321 GstPadChainFunction chainfunc;
4323 if (G_UNLIKELY ((chainfunc = GST_PAD_CHAINFUNC (pad)) == NULL))
4326 GST_CAT_DEBUG_OBJECT (GST_CAT_SCHEDULING, pad,
4327 "calling chainfunction &%s with buffer %" GST_PTR_FORMAT,
4328 GST_DEBUG_FUNCPTR_NAME (chainfunc), GST_BUFFER (data));
4330 ret = chainfunc (pad, parent, GST_BUFFER_CAST (data));
4332 GST_CAT_DEBUG_OBJECT (GST_CAT_SCHEDULING, pad,
4333 "called chainfunction &%s with buffer %p, returned %s",
4334 GST_DEBUG_FUNCPTR_NAME (chainfunc), data, gst_flow_get_name (ret));
4336 GstPadChainListFunction chainlistfunc;
4338 if (G_UNLIKELY ((chainlistfunc = GST_PAD_CHAINLISTFUNC (pad)) == NULL))
4341 GST_CAT_DEBUG_OBJECT (GST_CAT_SCHEDULING, pad,
4342 "calling chainlistfunction &%s",
4343 GST_DEBUG_FUNCPTR_NAME (chainlistfunc));
4345 ret = chainlistfunc (pad, parent, GST_BUFFER_LIST_CAST (data));
4347 GST_CAT_DEBUG_OBJECT (GST_CAT_SCHEDULING, pad,
4348 "called chainlistfunction &%s, returned %s",
4349 GST_DEBUG_FUNCPTR_NAME (chainlistfunc), gst_flow_get_name (ret));
4352 RELEASE_PARENT (parent);
4354 GST_PAD_STREAM_UNLOCK (pad);
4361 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4362 "chaining, but pad was flushing");
4363 GST_OBJECT_UNLOCK (pad);
4364 GST_PAD_STREAM_UNLOCK (pad);
4365 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4366 return GST_FLOW_FLUSHING;
4370 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "chaining, but pad was EOS");
4371 GST_OBJECT_UNLOCK (pad);
4372 GST_PAD_STREAM_UNLOCK (pad);
4373 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4374 return GST_FLOW_EOS;
4378 g_critical ("chain on pad %s:%s but it was not in push mode",
4379 GST_DEBUG_PAD_NAME (pad));
4380 GST_OBJECT_UNLOCK (pad);
4381 GST_PAD_STREAM_UNLOCK (pad);
4382 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4383 return GST_FLOW_ERROR;
4390 GST_OBJECT_UNLOCK (pad);
4391 GST_PAD_STREAM_UNLOCK (pad);
4392 /* We unref the buffer, except if the probe handled it (CUSTOM_SUCCESS_1) */
4394 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4397 case GST_FLOW_CUSTOM_SUCCESS:
4398 case GST_FLOW_CUSTOM_SUCCESS_1:
4399 GST_DEBUG_OBJECT (pad, "dropped or handled buffer");
4403 GST_DEBUG_OBJECT (pad, "an error occurred %s", gst_flow_get_name (ret));
4410 GST_DEBUG_OBJECT (pad, "No parent when chaining %" GST_PTR_FORMAT, data);
4411 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4412 GST_OBJECT_UNLOCK (pad);
4413 GST_PAD_STREAM_UNLOCK (pad);
4414 return GST_FLOW_FLUSHING;
4418 RELEASE_PARENT (parent);
4419 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4420 g_critical ("chain on pad %s:%s but it has no chainfunction",
4421 GST_DEBUG_PAD_NAME (pad));
4422 GST_PAD_STREAM_UNLOCK (pad);
4423 return GST_FLOW_NOT_SUPPORTED;
4429 * @pad: a sink #GstPad, returns GST_FLOW_ERROR if not.
4430 * @buffer: (transfer full): the #GstBuffer to send, return GST_FLOW_ERROR
4433 * Chain a buffer to @pad.
4435 * The function returns #GST_FLOW_FLUSHING if the pad was flushing.
4437 * If the buffer type is not acceptable for @pad (as negotiated with a
4438 * preceding GST_EVENT_CAPS event), this function returns
4439 * #GST_FLOW_NOT_NEGOTIATED.
4441 * The function proceeds calling the chain function installed on @pad (see
4442 * gst_pad_set_chain_function()) and the return value of that function is
4443 * returned to the caller. #GST_FLOW_NOT_SUPPORTED is returned if @pad has no
4446 * In all cases, success or failure, the caller loses its reference to @buffer
4447 * after calling this function.
4449 * Returns: a #GstFlowReturn from the pad.
4454 gst_pad_chain (GstPad * pad, GstBuffer * buffer)
4456 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4457 g_return_val_if_fail (GST_PAD_IS_SINK (pad), GST_FLOW_ERROR);
4458 g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR);
4460 return gst_pad_chain_data_unchecked (pad,
4461 GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_PUSH, buffer);
4464 static GstFlowReturn
4465 gst_pad_chain_list_default (GstPad * pad, GstObject * parent,
4466 GstBufferList * list)
4472 GST_INFO_OBJECT (pad, "chaining each buffer in list individually");
4474 len = gst_buffer_list_length (list);
4477 for (i = 0; i < len; i++) {
4478 buffer = gst_buffer_list_get (list, i);
4480 gst_pad_chain_data_unchecked (pad,
4481 GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_PUSH,
4482 gst_buffer_ref (buffer));
4483 if (ret != GST_FLOW_OK)
4486 gst_buffer_list_unref (list);
4492 * gst_pad_chain_list:
4493 * @pad: a sink #GstPad, returns GST_FLOW_ERROR if not.
4494 * @list: (transfer full): the #GstBufferList to send, return GST_FLOW_ERROR
4497 * Chain a bufferlist to @pad.
4499 * The function returns #GST_FLOW_FLUSHING if the pad was flushing.
4501 * If @pad was not negotiated properly with a CAPS event, this function
4502 * returns #GST_FLOW_NOT_NEGOTIATED.
4504 * The function proceeds calling the chainlist function installed on @pad (see
4505 * gst_pad_set_chain_list_function()) and the return value of that function is
4506 * returned to the caller. #GST_FLOW_NOT_SUPPORTED is returned if @pad has no
4507 * chainlist function.
4509 * In all cases, success or failure, the caller loses its reference to @list
4510 * after calling this function.
4514 * Returns: a #GstFlowReturn from the pad.
4517 gst_pad_chain_list (GstPad * pad, GstBufferList * list)
4519 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4520 g_return_val_if_fail (GST_PAD_IS_SINK (pad), GST_FLOW_ERROR);
4521 g_return_val_if_fail (GST_IS_BUFFER_LIST (list), GST_FLOW_ERROR);
4523 return gst_pad_chain_data_unchecked (pad,
4524 GST_PAD_PROBE_TYPE_BUFFER_LIST | GST_PAD_PROBE_TYPE_PUSH, list);
4527 static GstFlowReturn
4528 gst_pad_push_data (GstPad * pad, GstPadProbeType type, void *data)
4532 gboolean handled = FALSE;
4534 GST_OBJECT_LOCK (pad);
4535 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
4538 if (G_UNLIKELY (GST_PAD_IS_EOS (pad)))
4541 if (G_UNLIKELY (GST_PAD_MODE (pad) != GST_PAD_MODE_PUSH))
4544 #ifdef GST_ENABLE_EXTRA_CHECKS
4545 if (G_UNLIKELY (pad->priv->last_cookie != pad->priv->events_cookie)) {
4546 if (!find_event_by_type (pad, GST_EVENT_STREAM_START, 0)) {
4548 ":%s:<%s:%s> Got data flow before stream-start event",
4549 G_STRFUNC, GST_DEBUG_PAD_NAME (pad));
4551 if (!find_event_by_type (pad, GST_EVENT_SEGMENT, 0)) {
4553 ":%s:<%s:%s> Got data flow before segment event",
4554 G_STRFUNC, GST_DEBUG_PAD_NAME (pad));
4556 pad->priv->last_cookie = pad->priv->events_cookie;
4560 if (G_UNLIKELY ((ret = check_sticky (pad, NULL))) != GST_FLOW_OK)
4563 /* do block probes */
4564 PROBE_HANDLE (pad, type | GST_PAD_PROBE_TYPE_BLOCK, data, probe_stopped,
4567 /* recheck sticky events because the probe might have cause a relink */
4568 if (G_UNLIKELY ((ret = check_sticky (pad, NULL))) != GST_FLOW_OK)
4571 /* do post-blocking probes */
4572 PROBE_HANDLE (pad, type, data, probe_stopped, probe_handled);
4574 /* recheck sticky events because the probe might have cause a relink */
4575 if (G_UNLIKELY ((ret = check_sticky (pad, NULL))) != GST_FLOW_OK)
4578 if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL))
4581 /* take ref to peer pad before releasing the lock */
4582 gst_object_ref (peer);
4584 GST_OBJECT_UNLOCK (pad);
4586 ret = gst_pad_chain_data_unchecked (peer, type, data);
4589 gst_object_unref (peer);
4591 GST_OBJECT_LOCK (pad);
4592 pad->ABI.abi.last_flowret = ret;
4594 if (pad->priv->using == 0) {
4595 /* pad is not active anymore, trigger idle callbacks */
4596 PROBE_NO_DATA (pad, GST_PAD_PROBE_TYPE_PUSH | GST_PAD_PROBE_TYPE_IDLE,
4597 probe_stopped, ret);
4599 GST_OBJECT_UNLOCK (pad);
4603 /* ERROR recovery here */
4607 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4608 "pushing, but pad was flushing");
4609 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
4610 GST_OBJECT_UNLOCK (pad);
4611 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4612 return GST_FLOW_FLUSHING;
4616 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pushing, but pad was EOS");
4617 pad->ABI.abi.last_flowret = GST_FLOW_EOS;
4618 GST_OBJECT_UNLOCK (pad);
4619 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4620 return GST_FLOW_EOS;
4624 g_critical ("pushing on pad %s:%s but it was not activated in push mode",
4625 GST_DEBUG_PAD_NAME (pad));
4626 pad->ABI.abi.last_flowret = GST_FLOW_ERROR;
4627 GST_OBJECT_UNLOCK (pad);
4628 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4629 return GST_FLOW_ERROR;
4633 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4634 "error pushing events, return %s", gst_flow_get_name (ret));
4635 pad->ABI.abi.last_flowret = ret;
4636 GST_OBJECT_UNLOCK (pad);
4637 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4645 GST_OBJECT_UNLOCK (pad);
4646 if (data != NULL && !handled)
4647 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4650 case GST_FLOW_CUSTOM_SUCCESS:
4651 case GST_FLOW_CUSTOM_SUCCESS_1:
4652 GST_DEBUG_OBJECT (pad, "dropped or handled buffer");
4656 GST_DEBUG_OBJECT (pad, "an error occurred %s", gst_flow_get_name (ret));
4659 pad->ABI.abi.last_flowret = ret;
4664 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4665 "pushing, but it was not linked");
4666 pad->ABI.abi.last_flowret = GST_FLOW_NOT_LINKED;
4667 GST_OBJECT_UNLOCK (pad);
4668 gst_mini_object_unref (GST_MINI_OBJECT_CAST (data));
4669 return GST_FLOW_NOT_LINKED;
4675 * @pad: a source #GstPad, returns #GST_FLOW_ERROR if not.
4676 * @buffer: (transfer full): the #GstBuffer to push returns GST_FLOW_ERROR
4679 * Pushes a buffer to the peer of @pad.
4681 * This function will call installed block probes before triggering any
4682 * installed data probes.
4684 * The function proceeds calling gst_pad_chain() on the peer pad and returns
4685 * the value from that function. If @pad has no peer, #GST_FLOW_NOT_LINKED will
4688 * In all cases, success or failure, the caller loses its reference to @buffer
4689 * after calling this function.
4691 * Returns: a #GstFlowReturn from the peer pad.
4696 gst_pad_push (GstPad * pad, GstBuffer * buffer)
4700 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4701 g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR);
4702 g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR);
4704 GST_TRACER_PAD_PUSH_PRE (pad, buffer);
4705 res = gst_pad_push_data (pad,
4706 GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_PUSH, buffer);
4707 GST_TRACER_PAD_PUSH_POST (pad, res);
4712 * gst_pad_push_list:
4713 * @pad: a source #GstPad, returns #GST_FLOW_ERROR if not.
4714 * @list: (transfer full): the #GstBufferList to push returns GST_FLOW_ERROR
4717 * Pushes a buffer list to the peer of @pad.
4719 * This function will call installed block probes before triggering any
4720 * installed data probes.
4722 * The function proceeds calling the chain function on the peer pad and returns
4723 * the value from that function. If @pad has no peer, #GST_FLOW_NOT_LINKED will
4724 * be returned. If the peer pad does not have any installed chainlist function
4725 * every group buffer of the list will be merged into a normal #GstBuffer and
4726 * chained via gst_pad_chain().
4728 * In all cases, success or failure, the caller loses its reference to @list
4729 * after calling this function.
4731 * Returns: a #GstFlowReturn from the peer pad.
4736 gst_pad_push_list (GstPad * pad, GstBufferList * list)
4740 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4741 g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR);
4742 g_return_val_if_fail (GST_IS_BUFFER_LIST (list), GST_FLOW_ERROR);
4744 GST_TRACER_PAD_PUSH_LIST_PRE (pad, list);
4745 res = gst_pad_push_data (pad,
4746 GST_PAD_PROBE_TYPE_BUFFER_LIST | GST_PAD_PROBE_TYPE_PUSH, list);
4747 GST_TRACER_PAD_PUSH_LIST_POST (pad, res);
4751 static GstFlowReturn
4752 gst_pad_get_range_unchecked (GstPad * pad, guint64 offset, guint size,
4753 GstBuffer ** buffer)
4756 GstPadGetRangeFunction getrangefunc;
4760 GST_PAD_STREAM_LOCK (pad);
4762 GST_OBJECT_LOCK (pad);
4763 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
4766 if (G_UNLIKELY (GST_PAD_MODE (pad) != GST_PAD_MODE_PULL))
4769 if (G_UNLIKELY ((ret = check_sticky (pad, NULL))) != GST_FLOW_OK)
4774 /* when one of the probes returns DROPPED, probe_stopped will be called
4775 * and we skip calling the getrange function, res_buf should then contain a
4776 * valid result buffer */
4777 PROBE_PULL (pad, GST_PAD_PROBE_TYPE_PULL | GST_PAD_PROBE_TYPE_BLOCK,
4778 res_buf, offset, size, probe_stopped);
4780 /* recheck sticky events because the probe might have cause a relink */
4781 if (G_UNLIKELY ((ret = check_sticky (pad, NULL))) != GST_FLOW_OK)
4784 ACQUIRE_PARENT (pad, parent, no_parent);
4785 GST_OBJECT_UNLOCK (pad);
4787 if (G_UNLIKELY ((getrangefunc = GST_PAD_GETRANGEFUNC (pad)) == NULL))
4790 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4791 "calling getrangefunc %s, offset %"
4792 G_GUINT64_FORMAT ", size %u",
4793 GST_DEBUG_FUNCPTR_NAME (getrangefunc), offset, size);
4795 ret = getrangefunc (pad, parent, offset, size, &res_buf);
4797 RELEASE_PARENT (parent);
4799 GST_OBJECT_LOCK (pad);
4800 if (G_UNLIKELY (ret != GST_FLOW_OK))
4801 goto get_range_failed;
4803 /* can only fire the signal if we have a valid buffer */
4805 PROBE_PULL (pad, GST_PAD_PROBE_TYPE_PULL | GST_PAD_PROBE_TYPE_BUFFER,
4806 res_buf, offset, size, probe_stopped_unref);
4807 pad->ABI.abi.last_flowret = ret;
4808 GST_OBJECT_UNLOCK (pad);
4810 GST_PAD_STREAM_UNLOCK (pad);
4819 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4820 "getrange, but pad was flushing");
4821 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
4822 GST_OBJECT_UNLOCK (pad);
4823 GST_PAD_STREAM_UNLOCK (pad);
4824 return GST_FLOW_FLUSHING;
4828 g_critical ("getrange on pad %s:%s but it was not activated in pull mode",
4829 GST_DEBUG_PAD_NAME (pad));
4830 pad->ABI.abi.last_flowret = GST_FLOW_ERROR;
4831 GST_OBJECT_UNLOCK (pad);
4832 GST_PAD_STREAM_UNLOCK (pad);
4833 return GST_FLOW_ERROR;
4837 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "error pushing events");
4838 pad->ABI.abi.last_flowret = ret;
4839 GST_OBJECT_UNLOCK (pad);
4840 GST_PAD_STREAM_UNLOCK (pad);
4845 GST_DEBUG_OBJECT (pad, "no parent");
4846 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
4847 GST_OBJECT_UNLOCK (pad);
4848 GST_PAD_STREAM_UNLOCK (pad);
4849 return GST_FLOW_FLUSHING;
4853 g_critical ("getrange on pad %s:%s but it has no getrangefunction",
4854 GST_DEBUG_PAD_NAME (pad));
4855 RELEASE_PARENT (parent);
4856 GST_PAD_STREAM_UNLOCK (pad);
4857 return GST_FLOW_NOT_SUPPORTED;
4861 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4862 "probe returned %s", gst_flow_get_name (ret));
4863 if (ret == GST_FLOW_CUSTOM_SUCCESS) {
4865 /* the probe filled the buffer and asks us to not call the getrange
4866 * anymore, we continue with the post probes then. */
4867 GST_DEBUG_OBJECT (pad, "handled buffer");
4871 /* no buffer, we are EOS */
4872 GST_DEBUG_OBJECT (pad, "no buffer, return EOS");
4876 pad->ABI.abi.last_flowret = ret;
4877 GST_OBJECT_UNLOCK (pad);
4878 GST_PAD_STREAM_UNLOCK (pad);
4882 probe_stopped_unref:
4884 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
4885 "probe returned %s", gst_flow_get_name (ret));
4886 /* if we drop here, it signals EOS */
4887 if (ret == GST_FLOW_CUSTOM_SUCCESS)
4889 pad->ABI.abi.last_flowret = ret;
4890 GST_OBJECT_UNLOCK (pad);
4891 GST_PAD_STREAM_UNLOCK (pad);
4892 if (*buffer == NULL)
4893 gst_buffer_unref (res_buf);
4898 pad->ABI.abi.last_flowret = ret;
4899 GST_OBJECT_UNLOCK (pad);
4900 GST_PAD_STREAM_UNLOCK (pad);
4901 GST_CAT_LEVEL_LOG (GST_CAT_SCHEDULING,
4902 (ret >= GST_FLOW_EOS) ? GST_LEVEL_INFO : GST_LEVEL_WARNING,
4903 pad, "getrange failed, flow: %s", gst_flow_get_name (ret));
4909 * gst_pad_get_range:
4910 * @pad: a src #GstPad, returns #GST_FLOW_ERROR if not.
4911 * @offset: The start offset of the buffer
4912 * @size: The length of the buffer
4913 * @buffer: (out callee-allocates): a pointer to hold the #GstBuffer,
4914 * returns #GST_FLOW_ERROR if %NULL.
4916 * When @pad is flushing this function returns #GST_FLOW_FLUSHING
4917 * immediately and @buffer is %NULL.
4919 * Calls the getrange function of @pad, see #GstPadGetRangeFunction for a
4920 * description of a getrange function. If @pad has no getrange function
4921 * installed (see gst_pad_set_getrange_function()) this function returns
4922 * #GST_FLOW_NOT_SUPPORTED.
4924 * If @buffer points to a variable holding %NULL, a valid new #GstBuffer will be
4925 * placed in @buffer when this function returns #GST_FLOW_OK. The new buffer
4926 * must be freed with gst_buffer_unref() after usage.
4928 * When @buffer points to a variable that points to a valid #GstBuffer, the
4929 * buffer will be filled with the result data when this function returns
4930 * #GST_FLOW_OK. If the provided buffer is larger than @size, only
4931 * @size bytes will be filled in the result buffer and its size will be updated
4934 * Note that less than @size bytes can be returned in @buffer when, for example,
4935 * an EOS condition is near or when @buffer is not large enough to hold @size
4936 * bytes. The caller should check the result buffer size to get the result size.
4938 * When this function returns any other result value than #GST_FLOW_OK, @buffer
4939 * will be unchanged.
4941 * This is a lowlevel function. Usually gst_pad_pull_range() is used.
4943 * Returns: a #GstFlowReturn from the pad.
4948 gst_pad_get_range (GstPad * pad, guint64 offset, guint size,
4949 GstBuffer ** buffer)
4951 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
4952 g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR);
4953 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
4954 g_return_val_if_fail (*buffer == NULL || (GST_IS_BUFFER (*buffer)
4955 && gst_buffer_get_size (*buffer) >= size), GST_FLOW_ERROR);
4957 return gst_pad_get_range_unchecked (pad, offset, size, buffer);
4961 * gst_pad_pull_range:
4962 * @pad: a sink #GstPad, returns GST_FLOW_ERROR if not.
4963 * @offset: The start offset of the buffer
4964 * @size: The length of the buffer
4965 * @buffer: (out callee-allocates): a pointer to hold the #GstBuffer, returns
4966 * GST_FLOW_ERROR if %NULL.
4968 * Pulls a @buffer from the peer pad or fills up a provided buffer.
4970 * This function will first trigger the pad block signal if it was
4973 * When @pad is not linked #GST_FLOW_NOT_LINKED is returned else this
4974 * function returns the result of gst_pad_get_range() on the peer pad.
4975 * See gst_pad_get_range() for a list of return values and for the
4976 * semantics of the arguments of this function.
4978 * If @buffer points to a variable holding %NULL, a valid new #GstBuffer will be
4979 * placed in @buffer when this function returns #GST_FLOW_OK. The new buffer
4980 * must be freed with gst_buffer_unref() after usage. When this function
4981 * returns any other result value, @buffer will still point to %NULL.
4983 * When @buffer points to a variable that points to a valid #GstBuffer, the
4984 * buffer will be filled with the result data when this function returns
4985 * #GST_FLOW_OK. When this function returns any other result value,
4986 * @buffer will be unchanged. If the provided buffer is larger than @size, only
4987 * @size bytes will be filled in the result buffer and its size will be updated
4990 * Note that less than @size bytes can be returned in @buffer when, for example,
4991 * an EOS condition is near or when @buffer is not large enough to hold @size
4992 * bytes. The caller should check the result buffer size to get the result size.
4994 * Returns: a #GstFlowReturn from the peer pad.
4999 gst_pad_pull_range (GstPad * pad, guint64 offset, guint size,
5000 GstBuffer ** buffer)
5006 g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
5007 g_return_val_if_fail (GST_PAD_IS_SINK (pad), GST_FLOW_ERROR);
5008 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
5009 g_return_val_if_fail (*buffer == NULL || (GST_IS_BUFFER (*buffer)
5010 && gst_buffer_get_size (*buffer) >= size), GST_FLOW_ERROR);
5012 GST_TRACER_PAD_PULL_RANGE_PRE (pad, offset, size);
5014 GST_OBJECT_LOCK (pad);
5015 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
5018 if (G_UNLIKELY (GST_PAD_MODE (pad) != GST_PAD_MODE_PULL))
5023 /* when one of the probes returns DROPPED, probe_stopped will be
5024 * called and we skip calling the peer getrange function. *buffer should then
5025 * contain a valid buffer */
5026 PROBE_PULL (pad, GST_PAD_PROBE_TYPE_PULL | GST_PAD_PROBE_TYPE_BLOCK,
5027 res_buf, offset, size, probe_stopped);
5029 if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL))
5032 gst_object_ref (peer);
5034 GST_OBJECT_UNLOCK (pad);
5036 ret = gst_pad_get_range_unchecked (peer, offset, size, &res_buf);
5038 gst_object_unref (peer);
5040 GST_OBJECT_LOCK (pad);
5042 pad->ABI.abi.last_flowret = ret;
5043 if (pad->priv->using == 0) {
5044 /* pad is not active anymore, trigger idle callbacks */
5045 PROBE_NO_DATA (pad, GST_PAD_PROBE_TYPE_PULL | GST_PAD_PROBE_TYPE_IDLE,
5046 probe_stopped_unref, ret);
5049 if (G_UNLIKELY (ret != GST_FLOW_OK))
5050 goto pull_range_failed;
5053 PROBE_PULL (pad, GST_PAD_PROBE_TYPE_PULL | GST_PAD_PROBE_TYPE_BUFFER,
5054 res_buf, offset, size, probe_stopped_unref);
5056 GST_OBJECT_UNLOCK (pad);
5060 GST_TRACER_PAD_PULL_RANGE_POST (pad, *buffer, ret);
5063 /* ERROR recovery here */
5066 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
5067 "pullrange, but pad was flushing");
5068 pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
5069 GST_OBJECT_UNLOCK (pad);
5070 ret = GST_FLOW_FLUSHING;
5075 g_critical ("pullrange on pad %s:%s but it was not activated in pull mode",
5076 GST_DEBUG_PAD_NAME (pad));
5077 pad->ABI.abi.last_flowret = GST_FLOW_ERROR;
5078 GST_OBJECT_UNLOCK (pad);
5079 ret = GST_FLOW_ERROR;
5084 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pre probe returned %s",
5085 gst_flow_get_name (ret));
5086 if (ret == GST_FLOW_CUSTOM_SUCCESS) {
5088 /* the probe filled the buffer and asks us to not forward to the peer
5089 * anymore, we continue with the post probes then */
5090 GST_DEBUG_OBJECT (pad, "handled buffer");
5094 /* no buffer, we are EOS then */
5095 GST_DEBUG_OBJECT (pad, "no buffer, return EOS");
5099 pad->ABI.abi.last_flowret = ret;
5100 GST_OBJECT_UNLOCK (pad);
5105 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
5106 "pulling range, but it was not linked");
5107 pad->ABI.abi.last_flowret = GST_FLOW_NOT_LINKED;
5108 GST_OBJECT_UNLOCK (pad);
5109 ret = GST_FLOW_NOT_LINKED;
5114 pad->ABI.abi.last_flowret = ret;
5115 GST_OBJECT_UNLOCK (pad);
5116 GST_CAT_LEVEL_LOG (GST_CAT_SCHEDULING,
5117 (ret >= GST_FLOW_EOS) ? GST_LEVEL_INFO : GST_LEVEL_WARNING,
5118 pad, "pullrange failed, flow: %s", gst_flow_get_name (ret));
5121 probe_stopped_unref:
5123 GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
5124 "post probe returned %s", gst_flow_get_name (ret));
5126 /* if we drop here, it signals EOS */
5127 if (ret == GST_FLOW_CUSTOM_SUCCESS)
5130 pad->ABI.abi.last_flowret = ret;
5131 GST_OBJECT_UNLOCK (pad);
5133 if (*buffer == NULL)
5134 gst_buffer_unref (res_buf);
5138 GST_TRACER_PAD_PULL_RANGE_POST (pad, NULL, ret);
5142 /* must be called with pad object lock */
5143 static GstFlowReturn
5144 store_sticky_event (GstPad * pad, GstEvent * event)
5149 gboolean res = FALSE;
5150 const gchar *name = NULL;
5151 gboolean insert = TRUE;
5153 type = GST_EVENT_TYPE (event);
5155 /* Store all sticky events except SEGMENT/EOS when we're flushing,
5156 * otherwise they can be dropped and nothing would ever resend them.
5157 * Only do that for activated pads though, everything else is a bug!
5159 if (G_UNLIKELY (GST_PAD_MODE (pad) == GST_PAD_MODE_NONE
5160 || (GST_PAD_IS_FLUSHING (pad) && (type == GST_EVENT_SEGMENT
5161 || type == GST_EVENT_EOS))))
5164 /* Unset the EOS flag when received STREAM_START event, so pad can
5165 * store sticky event and then push it later */
5166 if (type == GST_EVENT_STREAM_START) {
5167 GST_LOG_OBJECT (pad, "Removing pending EOS and StreamGroupDone events");
5168 remove_event_by_type (pad, GST_EVENT_EOS);
5169 remove_event_by_type (pad, GST_EVENT_STREAM_GROUP_DONE);
5170 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_EOS);
5173 if (G_UNLIKELY (GST_PAD_IS_EOS (pad)))
5176 if (type & GST_EVENT_TYPE_STICKY_MULTI)
5177 name = gst_structure_get_name (gst_event_get_structure (event));
5179 events = pad->priv->events;
5182 for (i = 0; i < len; i++) {
5183 PadEvent *ev = &g_array_index (events, PadEvent, i);
5185 if (ev->event == NULL)
5188 if (type == GST_EVENT_TYPE (ev->event)) {
5189 /* matching types, check matching name if needed */
5190 if (name && !gst_event_has_name (ev->event, name))
5194 if ((res = gst_event_replace (&ev->event, event)))
5195 ev->received = FALSE;
5201 if (type < GST_EVENT_TYPE (ev->event) || (type != GST_EVENT_TYPE (ev->event)
5202 && GST_EVENT_TYPE (ev->event) == GST_EVENT_EOS)) {
5203 /* STREAM_START, CAPS and SEGMENT must be delivered in this order. By
5204 * storing the sticky ordered we can check that this is respected. */
5205 if (G_UNLIKELY (GST_EVENT_TYPE (ev->event) <= GST_EVENT_SEGMENT
5206 || GST_EVENT_TYPE (ev->event) == GST_EVENT_EOS))
5208 ":%s:<%s:%s> Sticky event misordering, got '%s' before '%s'",
5209 G_STRFUNC, GST_DEBUG_PAD_NAME (pad),
5210 gst_event_type_get_name (GST_EVENT_TYPE (ev->event)),
5211 gst_event_type_get_name (type));
5217 ev.event = gst_event_ref (event);
5218 ev.received = FALSE;
5219 g_array_insert_val (events, i, ev);
5224 pad->priv->events_cookie++;
5225 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
5227 GST_LOG_OBJECT (pad, "stored sticky event %s", GST_EVENT_TYPE_NAME (event));
5229 switch (GST_EVENT_TYPE (event)) {
5230 case GST_EVENT_CAPS:
5231 GST_OBJECT_UNLOCK (pad);
5233 GST_DEBUG_OBJECT (pad, "notify caps");
5234 g_object_notify_by_pspec ((GObject *) pad, pspec_caps);
5236 GST_OBJECT_LOCK (pad);
5242 if (type == GST_EVENT_EOS) {
5243 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_EOS);
5244 pad->ABI.abi.last_flowret = GST_FLOW_EOS;
5247 return GST_PAD_IS_FLUSHING (pad) ? GST_FLOW_FLUSHING : GST_FLOW_OK;
5252 GST_DEBUG_OBJECT (pad, "pad is flushing");
5253 return GST_FLOW_FLUSHING;
5257 GST_DEBUG_OBJECT (pad, "pad is EOS");
5258 return GST_FLOW_EOS;
5263 * gst_pad_store_sticky_event:
5265 * @event: (transfer none): a #GstEvent
5267 * Store the sticky @event on @pad
5269 * Returns: #GST_FLOW_OK on success, #GST_FLOW_FLUSHING when the pad
5270 * was flushing or #GST_FLOW_EOS when the pad was EOS.
5275 gst_pad_store_sticky_event (GstPad * pad, GstEvent * event)
5279 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
5280 g_return_val_if_fail (GST_IS_EVENT (event), FALSE);
5282 GST_OBJECT_LOCK (pad);
5283 ret = store_sticky_event (pad, event);
5284 GST_OBJECT_UNLOCK (pad);
5290 sticky_changed (GstPad * pad, PadEvent * ev, gpointer user_data)
5292 PushStickyData *data = user_data;
5294 /* Forward all sticky events before our current one that are pending */
5295 if (ev->event != data->event
5296 && GST_EVENT_TYPE (ev->event) < GST_EVENT_TYPE (data->event))
5297 return push_sticky (pad, ev, data);
5302 /* should be called with pad LOCK */
5303 static GstFlowReturn
5304 gst_pad_push_event_unchecked (GstPad * pad, GstEvent ** in_event,
5305 GstPadProbeType type)
5309 GstEventType event_type;
5310 GstEvent *event = *in_event;
5312 /* pass the adjusted event on. We need to do this even if
5313 * there is no peer pad because of the probes. */
5314 event = apply_pad_offset (pad, event, GST_PAD_IS_SINK (pad));
5316 /* Two checks to be made:
5317 * . (un)set the FLUSHING flag for flushing events,
5318 * . handle pad blocking */
5319 event_type = GST_EVENT_TYPE (event);
5320 switch (event_type) {
5321 case GST_EVENT_FLUSH_START:
5322 GST_PAD_SET_FLUSHING (pad);
5324 GST_PAD_BLOCK_BROADCAST (pad);
5325 type |= GST_PAD_PROBE_TYPE_EVENT_FLUSH;
5327 case GST_EVENT_FLUSH_STOP:
5328 if (G_UNLIKELY (!GST_PAD_IS_ACTIVE (pad)))
5331 GST_PAD_UNSET_FLUSHING (pad);
5333 /* Remove sticky EOS events */
5334 GST_LOG_OBJECT (pad, "Removing pending EOS events");
5335 remove_event_by_type (pad, GST_EVENT_EOS);
5336 remove_event_by_type (pad, GST_EVENT_STREAM_GROUP_DONE);
5337 remove_event_by_type (pad, GST_EVENT_SEGMENT);
5338 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_EOS);
5339 pad->ABI.abi.last_flowret = GST_FLOW_OK;
5341 type |= GST_PAD_PROBE_TYPE_EVENT_FLUSH;
5345 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
5348 /* No need to check for EOS here as either the caller (gst_pad_push_event())
5349 * checked already or this is called as part of pushing sticky events,
5350 * in which case we still want to forward the EOS event downstream.
5353 switch (GST_EVENT_TYPE (event)) {
5354 case GST_EVENT_RECONFIGURE:
5355 if (GST_PAD_IS_SINK (pad))
5356 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
5361 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH |
5362 GST_PAD_PROBE_TYPE_BLOCK, event, probe_stopped);
5363 /* recheck sticky events because the probe might have cause a relink */
5364 if (GST_PAD_HAS_PENDING_EVENTS (pad) && GST_PAD_IS_SRC (pad)
5365 && (GST_EVENT_IS_SERIALIZED (event)
5366 || GST_EVENT_IS_STICKY (event))) {
5367 PushStickyData data = { GST_FLOW_OK, FALSE, event };
5368 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PENDING_EVENTS);
5370 /* Push all sticky events before our current one
5371 * that have changed */
5372 events_foreach (pad, sticky_changed, &data);
5378 /* send probes after modifying the events above */
5379 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH, event, probe_stopped);
5381 /* recheck sticky events because the probe might have cause a relink */
5382 if (GST_PAD_HAS_PENDING_EVENTS (pad) && GST_PAD_IS_SRC (pad)
5383 && (GST_EVENT_IS_SERIALIZED (event)
5384 || GST_EVENT_IS_STICKY (event))) {
5385 PushStickyData data = { GST_FLOW_OK, FALSE, event };
5386 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_PENDING_EVENTS);
5388 /* Push all sticky events before our current one
5389 * that have changed */
5390 events_foreach (pad, sticky_changed, &data);
5393 /* now check the peer pad */
5394 peerpad = GST_PAD_PEER (pad);
5395 if (peerpad == NULL)
5398 gst_object_ref (peerpad);
5400 GST_OBJECT_UNLOCK (pad);
5402 GST_LOG_OBJECT (pad, "sending event %p (%s) to peerpad %" GST_PTR_FORMAT,
5403 event, gst_event_type_get_name (event_type), peerpad);
5405 ret = gst_pad_send_event_unchecked (peerpad, event, type);
5407 /* Note: we gave away ownership of the event at this point but we can still
5408 * print the old pointer */
5409 GST_LOG_OBJECT (pad,
5410 "sent event %p (%s) to peerpad %" GST_PTR_FORMAT ", ret %s", event,
5411 gst_event_type_get_name (event_type), peerpad, gst_flow_get_name (ret));
5413 gst_object_unref (peerpad);
5415 GST_OBJECT_LOCK (pad);
5417 if (pad->priv->using == 0) {
5418 /* pad is not active anymore, trigger idle callbacks */
5419 PROBE_NO_DATA (pad, GST_PAD_PROBE_TYPE_PUSH | GST_PAD_PROBE_TYPE_IDLE,
5420 idle_probe_stopped, ret);
5427 /* ERROR handling */
5430 GST_DEBUG_OBJECT (pad, "We're flushing");
5431 gst_event_unref (event);
5432 return GST_FLOW_FLUSHING;
5436 GST_DEBUG_OBJECT (pad, "flush-stop on inactive pad");
5437 gst_event_unref (event);
5438 return GST_FLOW_FLUSHING;
5442 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
5443 if (ret != GST_FLOW_CUSTOM_SUCCESS_1)
5444 gst_event_unref (event);
5447 case GST_FLOW_CUSTOM_SUCCESS_1:
5448 GST_DEBUG_OBJECT (pad, "handled event");
5450 case GST_FLOW_CUSTOM_SUCCESS:
5451 GST_DEBUG_OBJECT (pad, "dropped event");
5454 GST_DEBUG_OBJECT (pad, "an error occurred %s", gst_flow_get_name (ret));
5461 GST_DEBUG_OBJECT (pad, "Dropping event %s because pad is not linked",
5462 gst_event_type_get_name (GST_EVENT_TYPE (event)));
5463 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_PENDING_EVENTS);
5464 gst_event_unref (event);
5466 /* unlinked pads should not influence latency configuration */
5467 if (event_type == GST_EVENT_LATENCY)
5470 return GST_FLOW_NOT_LINKED;
5474 GST_DEBUG_OBJECT (pad, "Idle probe returned %s", gst_flow_get_name (ret));
5480 * gst_pad_push_event:
5481 * @pad: a #GstPad to push the event to.
5482 * @event: (transfer full): the #GstEvent to send to the pad.
5484 * Sends the event to the peer of the given pad. This function is
5485 * mainly used by elements to send events to their peer
5488 * This function takes ownership of the provided event so you should
5489 * gst_event_ref() it if you want to reuse the event after this call.
5491 * Returns: %TRUE if the event was handled.
5496 gst_pad_push_event (GstPad * pad, GstEvent * event)
5498 gboolean res = FALSE;
5499 GstPadProbeType type;
5500 gboolean sticky, serialized;
5502 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
5503 g_return_val_if_fail (GST_IS_EVENT (event), FALSE);
5505 GST_TRACER_PAD_PUSH_EVENT_PRE (pad, event);
5507 if (GST_PAD_IS_SRC (pad)) {
5508 if (G_UNLIKELY (!GST_EVENT_IS_DOWNSTREAM (event)))
5509 goto wrong_direction;
5510 type = GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM;
5511 } else if (GST_PAD_IS_SINK (pad)) {
5512 if (G_UNLIKELY (!GST_EVENT_IS_UPSTREAM (event)))
5513 goto wrong_direction;
5514 /* events pushed on sinkpad never are sticky */
5515 type = GST_PAD_PROBE_TYPE_EVENT_UPSTREAM;
5517 goto unknown_direction;
5519 GST_OBJECT_LOCK (pad);
5520 sticky = GST_EVENT_IS_STICKY (event);
5521 serialized = GST_EVENT_IS_SERIALIZED (event);
5524 /* srcpad sticky events are stored immediately, the received flag is set
5525 * to FALSE and will be set to TRUE when we can successfully push the
5526 * event to the peer pad */
5527 switch (store_sticky_event (pad, event)) {
5528 case GST_FLOW_FLUSHING:
5536 if (GST_PAD_IS_SRC (pad) && (serialized || sticky)) {
5537 /* all serialized or sticky events on the srcpad trigger push of
5539 res = (check_sticky (pad, event) == GST_FLOW_OK);
5544 /* other events are pushed right away */
5545 ret = gst_pad_push_event_unchecked (pad, &event, type);
5546 /* dropped events by a probe are not an error */
5547 res = (ret == GST_FLOW_OK || ret == GST_FLOW_CUSTOM_SUCCESS
5548 || ret == GST_FLOW_CUSTOM_SUCCESS_1);
5550 /* Errors in sticky event pushing are no problem and ignored here
5551 * as they will cause more meaningful errors during data flow.
5552 * For EOS events, that are not followed by data flow, we still
5553 * return FALSE here though.
5555 if (GST_EVENT_TYPE (event) != GST_EVENT_EOS)
5557 gst_event_unref (event);
5559 GST_OBJECT_UNLOCK (pad);
5561 GST_TRACER_PAD_PUSH_EVENT_POST (pad, res);
5564 /* ERROR handling */
5567 g_warning ("pad %s:%s pushing %s event in wrong direction",
5568 GST_DEBUG_PAD_NAME (pad), GST_EVENT_TYPE_NAME (event));
5569 gst_event_unref (event);
5574 g_warning ("pad %s:%s has invalid direction", GST_DEBUG_PAD_NAME (pad));
5575 gst_event_unref (event);
5580 GST_DEBUG_OBJECT (pad, "We're flushing");
5581 GST_OBJECT_UNLOCK (pad);
5582 gst_event_unref (event);
5587 GST_DEBUG_OBJECT (pad, "We're EOS");
5588 GST_OBJECT_UNLOCK (pad);
5589 gst_event_unref (event);
5593 GST_TRACER_PAD_PUSH_EVENT_POST (pad, FALSE);
5597 /* Check if we can call the event function with the given event */
5598 static GstFlowReturn
5599 pre_eventfunc_check (GstPad * pad, GstEvent * event)
5603 switch (GST_EVENT_TYPE (event)) {
5604 case GST_EVENT_CAPS:
5606 /* backwards compatibility mode for caps */
5607 gst_event_parse_caps (event, &caps);
5609 if (!gst_pad_query_accept_caps (pad, caps))
5621 GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
5622 "caps %" GST_PTR_FORMAT " not accepted", caps);
5623 return GST_FLOW_NOT_NEGOTIATED;
5627 static GstFlowReturn
5628 gst_pad_send_event_unchecked (GstPad * pad, GstEvent * event,
5629 GstPadProbeType type)
5632 GstEventType event_type;
5633 gboolean serialized, need_unlock = FALSE, sticky;
5634 GstPadEventFunction eventfunc;
5635 GstPadEventFullFunction eventfullfunc = NULL;
5638 GST_OBJECT_LOCK (pad);
5640 event = apply_pad_offset (pad, event, GST_PAD_IS_SRC (pad));
5642 if (GST_PAD_IS_SINK (pad))
5643 serialized = GST_EVENT_IS_SERIALIZED (event);
5646 sticky = GST_EVENT_IS_STICKY (event);
5647 event_type = GST_EVENT_TYPE (event);
5648 switch (event_type) {
5649 case GST_EVENT_FLUSH_START:
5650 GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad,
5651 "have event type %d (FLUSH_START)", GST_EVENT_TYPE (event));
5653 /* can't even accept a flush begin event when flushing */
5654 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
5657 GST_PAD_SET_FLUSHING (pad);
5658 GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad, "set flush flag");
5659 GST_PAD_BLOCK_BROADCAST (pad);
5660 type |= GST_PAD_PROBE_TYPE_EVENT_FLUSH;
5662 case GST_EVENT_FLUSH_STOP:
5663 /* we can't accept flush-stop on inactive pads else the flushing flag
5664 * would be cleared and it would look like the pad can accept data.
5665 * Also, some elements restart a streaming thread in flush-stop which we
5666 * can't allow on inactive pads */
5667 if (G_UNLIKELY (!GST_PAD_IS_ACTIVE (pad)))
5670 GST_PAD_UNSET_FLUSHING (pad);
5671 GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad, "cleared flush flag");
5672 /* Remove pending EOS events */
5673 GST_LOG_OBJECT (pad, "Removing pending EOS and SEGMENT events");
5674 remove_event_by_type (pad, GST_EVENT_EOS);
5675 remove_event_by_type (pad, GST_EVENT_STREAM_GROUP_DONE);
5676 remove_event_by_type (pad, GST_EVENT_SEGMENT);
5677 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_EOS);
5678 pad->ABI.abi.last_flowret = GST_FLOW_OK;
5680 GST_OBJECT_UNLOCK (pad);
5681 /* grab stream lock */
5682 GST_PAD_STREAM_LOCK (pad);
5684 GST_OBJECT_LOCK (pad);
5685 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
5688 case GST_EVENT_RECONFIGURE:
5689 if (GST_PAD_IS_SRC (pad))
5690 GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
5692 GST_CAT_DEBUG_OBJECT (GST_CAT_EVENT, pad,
5693 "have event type %" GST_PTR_FORMAT, event);
5695 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
5698 switch (event_type) {
5699 case GST_EVENT_STREAM_START:
5700 /* Remove sticky EOS events */
5701 GST_LOG_OBJECT (pad, "Removing pending EOS events");
5702 remove_event_by_type (pad, GST_EVENT_EOS);
5703 remove_event_by_type (pad, GST_EVENT_STREAM_GROUP_DONE);
5704 GST_OBJECT_FLAG_UNSET (pad, GST_PAD_FLAG_EOS);
5711 if (G_UNLIKELY (GST_PAD_IS_EOS (pad)))
5714 /* lock order: STREAM_LOCK, LOCK, recheck flushing. */
5715 GST_OBJECT_UNLOCK (pad);
5716 GST_PAD_STREAM_LOCK (pad);
5718 GST_OBJECT_LOCK (pad);
5719 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
5722 if (G_UNLIKELY (GST_PAD_IS_EOS (pad)))
5728 /* now do the probe */
5730 type | GST_PAD_PROBE_TYPE_PUSH |
5731 GST_PAD_PROBE_TYPE_BLOCK, event, probe_stopped);
5733 PROBE_PUSH (pad, type | GST_PAD_PROBE_TYPE_PUSH, event, probe_stopped);
5735 eventfullfunc = GST_PAD_EVENTFULLFUNC (pad);
5736 eventfunc = GST_PAD_EVENTFUNC (pad);
5737 if (G_UNLIKELY (eventfunc == NULL && eventfullfunc == NULL))
5740 ACQUIRE_PARENT (pad, parent, no_parent);
5741 GST_OBJECT_UNLOCK (pad);
5743 ret = pre_eventfunc_check (pad, event);
5744 if (G_UNLIKELY (ret != GST_FLOW_OK))
5745 goto precheck_failed;
5748 gst_event_ref (event);
5750 if (eventfullfunc) {
5751 ret = eventfullfunc (pad, parent, event);
5752 } else if (eventfunc (pad, parent, event)) {
5755 /* something went wrong */
5756 switch (event_type) {
5757 case GST_EVENT_CAPS:
5758 ret = GST_FLOW_NOT_NEGOTIATED;
5761 ret = GST_FLOW_ERROR;
5765 RELEASE_PARENT (parent);
5767 GST_DEBUG_OBJECT (pad, "sent event, ret %s", gst_flow_get_name (ret));
5770 if (ret == GST_FLOW_OK) {
5771 GST_OBJECT_LOCK (pad);
5772 /* after the event function accepted the event, we can store the sticky
5773 * event on the pad */
5774 switch (store_sticky_event (pad, event)) {
5775 case GST_FLOW_FLUSHING:
5782 GST_OBJECT_UNLOCK (pad);
5784 gst_event_unref (event);
5788 GST_PAD_STREAM_UNLOCK (pad);
5792 /* ERROR handling */
5795 GST_OBJECT_UNLOCK (pad);
5797 GST_PAD_STREAM_UNLOCK (pad);
5798 GST_CAT_INFO_OBJECT (GST_CAT_EVENT, pad,
5799 "Received event on flushing pad. Discarding");
5800 gst_event_unref (event);
5801 return GST_FLOW_FLUSHING;
5805 GST_OBJECT_UNLOCK (pad);
5807 GST_PAD_STREAM_UNLOCK (pad);
5808 GST_CAT_INFO_OBJECT (GST_CAT_EVENT, pad,
5809 "Received flush-stop on inactive pad. Discarding");
5810 gst_event_unref (event);
5811 return GST_FLOW_FLUSHING;
5815 GST_OBJECT_UNLOCK (pad);
5817 GST_PAD_STREAM_UNLOCK (pad);
5818 GST_CAT_INFO_OBJECT (GST_CAT_EVENT, pad,
5819 "Received event on EOS pad. Discarding");
5820 gst_event_unref (event);
5821 return GST_FLOW_EOS;
5825 GST_OBJECT_UNLOCK (pad);
5827 GST_PAD_STREAM_UNLOCK (pad);
5828 /* Only unref if unhandled */
5829 if (ret != GST_FLOW_CUSTOM_SUCCESS_1)
5830 gst_event_unref (event);
5833 case GST_FLOW_CUSTOM_SUCCESS_1:
5834 case GST_FLOW_CUSTOM_SUCCESS:
5835 GST_DEBUG_OBJECT (pad, "dropped or handled event");
5839 GST_DEBUG_OBJECT (pad, "an error occurred %s", gst_flow_get_name (ret));
5846 g_warning ("pad %s:%s has no event handler, file a bug.",
5847 GST_DEBUG_PAD_NAME (pad));
5848 GST_OBJECT_UNLOCK (pad);
5850 GST_PAD_STREAM_UNLOCK (pad);
5851 gst_event_unref (event);
5852 return GST_FLOW_NOT_SUPPORTED;
5856 GST_DEBUG_OBJECT (pad, "no parent");
5857 GST_OBJECT_UNLOCK (pad);
5859 GST_PAD_STREAM_UNLOCK (pad);
5860 gst_event_unref (event);
5861 return GST_FLOW_FLUSHING;
5865 GST_DEBUG_OBJECT (pad, "pre event check failed");
5866 RELEASE_PARENT (parent);
5868 GST_PAD_STREAM_UNLOCK (pad);
5869 gst_event_unref (event);
5875 * gst_pad_send_event:
5876 * @pad: a #GstPad to send the event to.
5877 * @event: (transfer full): the #GstEvent to send to the pad.
5879 * Sends the event to the pad. This function can be used
5880 * by applications to send events in the pipeline.
5882 * If @pad is a source pad, @event should be an upstream event. If @pad is a
5883 * sink pad, @event should be a downstream event. For example, you would not
5884 * send a #GST_EVENT_EOS on a src pad; EOS events only propagate downstream.
5885 * Furthermore, some downstream events have to be serialized with data flow,
5886 * like EOS, while some can travel out-of-band, like #GST_EVENT_FLUSH_START. If
5887 * the event needs to be serialized with data flow, this function will take the
5888 * pad's stream lock while calling its event function.
5890 * To find out whether an event type is upstream, downstream, or downstream and
5891 * serialized, see #GstEventTypeFlags, gst_event_type_get_flags(),
5892 * #GST_EVENT_IS_UPSTREAM, #GST_EVENT_IS_DOWNSTREAM, and
5893 * #GST_EVENT_IS_SERIALIZED. Note that in practice that an application or
5894 * plugin doesn't need to bother itself with this information; the core handles
5895 * all necessary locks and checks.
5897 * This function takes ownership of the provided event so you should
5898 * gst_event_ref() it if you want to reuse the event after this call.
5900 * Returns: %TRUE if the event was handled.
5903 gst_pad_send_event (GstPad * pad, GstEvent * event)
5906 GstPadProbeType type;
5908 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
5909 g_return_val_if_fail (event != NULL, FALSE);
5911 if (GST_PAD_IS_SINK (pad)) {
5912 if (G_UNLIKELY (!GST_EVENT_IS_DOWNSTREAM (event)))
5913 goto wrong_direction;
5914 type = GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM;
5915 } else if (GST_PAD_IS_SRC (pad)) {
5916 if (G_UNLIKELY (!GST_EVENT_IS_UPSTREAM (event)))
5917 goto wrong_direction;
5918 type = GST_PAD_PROBE_TYPE_EVENT_UPSTREAM;
5920 goto unknown_direction;
5922 if (gst_pad_send_event_unchecked (pad, event, type) != GST_FLOW_OK)
5929 /* ERROR handling */
5932 g_warning ("pad %s:%s sending %s event in wrong direction",
5933 GST_DEBUG_PAD_NAME (pad), GST_EVENT_TYPE_NAME (event));
5934 gst_event_unref (event);
5939 g_warning ("pad %s:%s has invalid direction", GST_DEBUG_PAD_NAME (pad));
5940 gst_event_unref (event);
5946 * gst_pad_set_element_private:
5947 * @pad: the #GstPad to set the private data of.
5948 * @priv: The private data to attach to the pad.
5950 * Set the given private data gpointer on the pad.
5951 * This function can only be used by the element that owns the pad.
5952 * No locking is performed in this function.
5955 gst_pad_set_element_private (GstPad * pad, gpointer priv)
5957 pad->element_private = priv;
5961 * gst_pad_get_element_private:
5962 * @pad: the #GstPad to get the private data of.
5964 * Gets the private data of a pad.
5965 * No locking is performed in this function.
5967 * Returns: (transfer none) (nullable): a #gpointer to the private data.
5970 gst_pad_get_element_private (GstPad * pad)
5972 return pad->element_private;
5976 * gst_pad_get_sticky_event:
5977 * @pad: the #GstPad to get the event from.
5978 * @event_type: the #GstEventType that should be retrieved.
5979 * @idx: the index of the event
5981 * Returns a new reference of the sticky event of type @event_type
5984 * Returns: (transfer full) (nullable): a #GstEvent of type
5985 * @event_type or %NULL when no event of @event_type was on
5986 * @pad. Unref after usage.
5989 gst_pad_get_sticky_event (GstPad * pad, GstEventType event_type, guint idx)
5991 GstEvent *event = NULL;
5994 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
5995 g_return_val_if_fail ((event_type & GST_EVENT_TYPE_STICKY) != 0, NULL);
5997 GST_OBJECT_LOCK (pad);
5998 ev = find_event_by_type (pad, event_type, idx);
5999 if (ev && (event = ev->event))
6000 gst_event_ref (event);
6001 GST_OBJECT_UNLOCK (pad);
6008 GstPadStickyEventsForeachFunction func;
6013 foreach_dispatch_function (GstPad * pad, PadEvent * ev, gpointer user_data)
6015 ForeachDispatch *data = user_data;
6016 gboolean ret = TRUE;
6019 GST_OBJECT_UNLOCK (pad);
6021 ret = data->func (pad, &ev->event, data->user_data);
6023 GST_OBJECT_LOCK (pad);
6030 * gst_pad_sticky_events_foreach:
6031 * @pad: the #GstPad that should be used for iteration.
6032 * @foreach_func: (scope call): the #GstPadStickyEventsForeachFunction that
6033 * should be called for every event.
6034 * @user_data: (closure): the optional user data.
6036 * Iterates all sticky events on @pad and calls @foreach_func for every
6037 * event. If @foreach_func returns %FALSE the iteration is immediately stopped.
6040 gst_pad_sticky_events_foreach (GstPad * pad,
6041 GstPadStickyEventsForeachFunction foreach_func, gpointer user_data)
6043 ForeachDispatch data;
6045 g_return_if_fail (GST_IS_PAD (pad));
6046 g_return_if_fail (foreach_func != NULL);
6048 data.func = foreach_func;
6049 data.user_data = user_data;
6051 GST_OBJECT_LOCK (pad);
6052 events_foreach (pad, foreach_dispatch_function, &data);
6053 GST_OBJECT_UNLOCK (pad);
6057 do_stream_status (GstPad * pad, GstStreamStatusType type,
6058 GThread * thread, GstTask * task)
6062 GST_DEBUG_OBJECT (pad, "doing stream-status %d", type);
6064 if ((parent = GST_ELEMENT_CAST (gst_pad_get_parent (pad)))) {
6065 if (GST_IS_ELEMENT (parent)) {
6066 GstMessage *message;
6067 GValue value = { 0 };
6069 if (type == GST_STREAM_STATUS_TYPE_ENTER) {
6070 gchar *tname, *ename, *pname;
6072 /* create a good task name */
6073 ename = gst_element_get_name (parent);
6074 pname = gst_pad_get_name (pad);
6075 tname = g_strdup_printf ("%s:%s", ename, pname);
6079 gst_object_set_name (GST_OBJECT_CAST (task), tname);
6083 message = gst_message_new_stream_status (GST_OBJECT_CAST (pad),
6086 g_value_init (&value, GST_TYPE_TASK);
6087 g_value_set_object (&value, task);
6088 gst_message_set_stream_status_object (message, &value);
6089 g_value_unset (&value);
6091 GST_DEBUG_OBJECT (pad, "posting stream-status %d", type);
6092 gst_element_post_message (parent, message);
6094 gst_object_unref (parent);
6099 pad_enter_thread (GstTask * task, GThread * thread, gpointer user_data)
6101 do_stream_status (GST_PAD_CAST (user_data), GST_STREAM_STATUS_TYPE_ENTER,
6106 pad_leave_thread (GstTask * task, GThread * thread, gpointer user_data)
6108 do_stream_status (GST_PAD_CAST (user_data), GST_STREAM_STATUS_TYPE_LEAVE,
6113 * gst_pad_start_task:
6114 * @pad: the #GstPad to start the task of
6115 * @func: the task function to call
6116 * @user_data: user data passed to the task function
6117 * @notify: called when @user_data is no longer referenced
6119 * Starts a task that repeatedly calls @func with @user_data. This function
6120 * is mostly used in pad activation functions to start the dataflow.
6121 * The #GST_PAD_STREAM_LOCK of @pad will automatically be acquired
6122 * before @func is called.
6124 * Returns: a %TRUE if the task could be started.
6127 gst_pad_start_task (GstPad * pad, GstTaskFunction func, gpointer user_data,
6128 GDestroyNotify notify)
6133 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
6134 g_return_val_if_fail (func != NULL, FALSE);
6136 GST_DEBUG_OBJECT (pad, "start task");
6138 GST_OBJECT_LOCK (pad);
6139 task = GST_PAD_TASK (pad);
6141 task = gst_task_new (func, user_data, notify);
6142 gst_task_set_lock (task, GST_PAD_GET_STREAM_LOCK (pad));
6143 gst_task_set_enter_callback (task, pad_enter_thread, pad, NULL);
6144 gst_task_set_leave_callback (task, pad_leave_thread, pad, NULL);
6145 GST_INFO_OBJECT (pad, "created task %p", task);
6146 GST_PAD_TASK (pad) = task;
6147 gst_object_ref (task);
6148 /* release lock to post the message */
6149 GST_OBJECT_UNLOCK (pad);
6151 do_stream_status (pad, GST_STREAM_STATUS_TYPE_CREATE, NULL, task);
6153 gst_object_unref (task);
6155 GST_OBJECT_LOCK (pad);
6156 /* nobody else is supposed to have changed the pad now */
6157 if (GST_PAD_TASK (pad) != task)
6158 goto concurrent_stop;
6160 res = gst_task_set_state (task, GST_TASK_STARTED);
6161 GST_OBJECT_UNLOCK (pad);
6168 GST_OBJECT_UNLOCK (pad);
6174 * gst_pad_pause_task:
6175 * @pad: the #GstPad to pause the task of
6177 * Pause the task of @pad. This function will also wait until the
6178 * function executed by the task is finished if this function is not
6179 * called from the task function.
6181 * Returns: a %TRUE if the task could be paused or %FALSE when the pad
6185 gst_pad_pause_task (GstPad * pad)
6190 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
6192 GST_DEBUG_OBJECT (pad, "pause task");
6194 GST_OBJECT_LOCK (pad);
6195 task = GST_PAD_TASK (pad);
6198 res = gst_task_set_state (task, GST_TASK_PAUSED);
6199 /* unblock activation waits if any */
6200 pad->priv->in_activation = FALSE;
6201 g_cond_broadcast (&pad->priv->activation_cond);
6202 GST_OBJECT_UNLOCK (pad);
6204 /* wait for task function to finish, this lock is recursive so it does nothing
6205 * when the pause is called from the task itself */
6206 GST_PAD_STREAM_LOCK (pad);
6207 GST_PAD_STREAM_UNLOCK (pad);
6213 GST_DEBUG_OBJECT (pad, "pad has no task");
6214 GST_OBJECT_UNLOCK (pad);
6220 * gst_pad_get_task_state:
6221 * @pad: the #GstPad to get task state from
6223 * Get @pad task state. If no task is currently
6224 * set, #GST_TASK_STOPPED is returned.
6226 * Returns: The current state of @pad's task.
6231 gst_pad_get_task_state (GstPad * pad)
6236 g_return_val_if_fail (GST_IS_PAD (pad), GST_TASK_STOPPED);
6238 GST_OBJECT_LOCK (pad);
6239 task = GST_PAD_TASK (pad);
6242 res = gst_task_get_state (task);
6243 GST_OBJECT_UNLOCK (pad);
6249 GST_DEBUG_OBJECT (pad, "pad has no task");
6250 GST_OBJECT_UNLOCK (pad);
6251 return GST_TASK_STOPPED;
6256 * gst_pad_stop_task:
6257 * @pad: the #GstPad to stop the task of
6259 * Stop the task of @pad. This function will also make sure that the
6260 * function executed by the task will effectively stop if not called
6261 * from the GstTaskFunction.
6263 * This function will deadlock if called from the GstTaskFunction of
6264 * the task. Use gst_task_pause() instead.
6266 * Regardless of whether the pad has a task, the stream lock is acquired and
6267 * released so as to ensure that streaming through this pad has finished.
6269 * Returns: a %TRUE if the task could be stopped or %FALSE on error.
6272 gst_pad_stop_task (GstPad * pad)
6277 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
6279 GST_DEBUG_OBJECT (pad, "stop task");
6281 GST_OBJECT_LOCK (pad);
6282 task = GST_PAD_TASK (pad);
6285 GST_PAD_TASK (pad) = NULL;
6286 res = gst_task_set_state (task, GST_TASK_STOPPED);
6287 /* unblock activation waits if any */
6288 pad->priv->in_activation = FALSE;
6289 g_cond_broadcast (&pad->priv->activation_cond);
6290 GST_OBJECT_UNLOCK (pad);
6292 GST_PAD_STREAM_LOCK (pad);
6293 GST_PAD_STREAM_UNLOCK (pad);
6295 if (!gst_task_join (task))
6298 gst_object_unref (task);
6304 GST_DEBUG_OBJECT (pad, "no task");
6305 GST_OBJECT_UNLOCK (pad);
6307 GST_PAD_STREAM_LOCK (pad);
6308 GST_PAD_STREAM_UNLOCK (pad);
6310 /* this is not an error */
6315 /* this is bad, possibly the application tried to join the task from
6316 * the task's thread. We install the task again so that it will be stopped
6317 * again from the right thread next time hopefully. */
6318 GST_OBJECT_LOCK (pad);
6319 GST_DEBUG_OBJECT (pad, "join failed");
6320 /* we can only install this task if there was no other task */
6321 if (GST_PAD_TASK (pad) == NULL)
6322 GST_PAD_TASK (pad) = task;
6323 GST_OBJECT_UNLOCK (pad);
6330 * gst_pad_probe_info_get_event:
6331 * @info: a #GstPadProbeInfo
6333 * Returns: (transfer none) (nullable): The #GstEvent from the probe
6337 gst_pad_probe_info_get_event (GstPadProbeInfo * info)
6339 g_return_val_if_fail (info->type & (GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM |
6340 GST_PAD_PROBE_TYPE_EVENT_UPSTREAM), NULL);
6342 return GST_PAD_PROBE_INFO_EVENT (info);
6347 * gst_pad_probe_info_get_query:
6348 * @info: a #GstPadProbeInfo
6350 * Returns: (transfer none) (nullable): The #GstQuery from the probe
6354 gst_pad_probe_info_get_query (GstPadProbeInfo * info)
6356 g_return_val_if_fail (info->type & (GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM |
6357 GST_PAD_PROBE_TYPE_QUERY_UPSTREAM), NULL);
6359 return GST_PAD_PROBE_INFO_QUERY (info);
6363 * gst_pad_probe_info_get_buffer:
6364 * @info: a #GstPadProbeInfo
6366 * Returns: (transfer none) (nullable): The #GstBuffer from the probe
6370 gst_pad_probe_info_get_buffer (GstPadProbeInfo * info)
6372 g_return_val_if_fail (info->type & GST_PAD_PROBE_TYPE_BUFFER, NULL);
6374 return GST_PAD_PROBE_INFO_BUFFER (info);
6378 * gst_pad_probe_info_get_buffer_list:
6379 * @info: a #GstPadProbeInfo
6381 * Returns: (transfer none) (nullable): The #GstBufferList from the probe
6385 gst_pad_probe_info_get_buffer_list (GstPadProbeInfo * info)
6387 g_return_val_if_fail (info->type & GST_PAD_PROBE_TYPE_BUFFER_LIST, NULL);
6389 return GST_PAD_PROBE_INFO_BUFFER_LIST (info);
6393 * gst_pad_get_last_flow_return:
6396 * Gets the #GstFlowReturn return from the last data passed by this pad.
6401 gst_pad_get_last_flow_return (GstPad * pad)
6405 GST_OBJECT_LOCK (pad);
6406 ret = GST_PAD_LAST_FLOW_RETURN (pad);
6407 GST_OBJECT_UNLOCK (pad);