1 /* GStreamer aggregator base class
2 * Copyright (C) 2014 Mathieu Duponchelle <mathieu.duponchelle@opencreed.com>
3 * Copyright (C) 2014 Thibault Saunier <tsaunier@gnome.org>
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.
23 * SECTION: gstaggregator
24 * @title: GstAggregator
25 * @short_description: manages a set of pads with the purpose of
26 * aggregating their buffers.
27 * @see_also: gstcollectpads for historical reasons.
29 * Manages a set of pads with the purpose of aggregating their buffers.
30 * Control is given to the subclass when all pads have data.
32 * * Base class for mixers and muxers. Subclasses should at least implement
33 * the #GstAggregatorClass.aggregate() virtual method.
35 * * When data is queued on all pads, tha aggregate vmethod is called.
37 * * One can peek at the data on any given GstAggregatorPad with the
38 * gst_aggregator_pad_get_buffer () method, and take ownership of it
39 * with the gst_aggregator_pad_steal_buffer () method. When a buffer
40 * has been taken with steal_buffer (), a new buffer can be queued
43 * * If the subclass wishes to push a buffer downstream in its aggregate
44 * implementation, it should do so through the
45 * gst_aggregator_finish_buffer () method. This method will take care
46 * of sending and ordering mandatory events such as stream start, caps
49 * * Same goes for EOS events, which should not be pushed directly by the
50 * subclass, it should instead return GST_FLOW_EOS in its aggregate
53 * * Note that the aggregator logic regarding gap event handling is to turn
54 * these into gap buffers with matching PTS and duration. It will also
55 * flag these buffers with GST_BUFFER_FLAG_GAP and GST_BUFFER_FLAG_DROPPABLE
56 * to ease their identification and subsequent processing.
64 #include <string.h> /* strlen */
66 #include "gstaggregator.h"
70 GST_AGGREGATOR_START_TIME_SELECTION_ZERO,
71 GST_AGGREGATOR_START_TIME_SELECTION_FIRST,
72 GST_AGGREGATOR_START_TIME_SELECTION_SET
73 } GstAggregatorStartTimeSelection;
76 gst_aggregator_start_time_selection_get_type (void)
78 static GType gtype = 0;
81 static const GEnumValue values[] = {
82 {GST_AGGREGATOR_START_TIME_SELECTION_ZERO,
83 "Start at 0 running time (default)", "zero"},
84 {GST_AGGREGATOR_START_TIME_SELECTION_FIRST,
85 "Start at first observed input running time", "first"},
86 {GST_AGGREGATOR_START_TIME_SELECTION_SET,
87 "Set start time with start-time property", "set"},
91 gtype = g_enum_register_static ("GstAggregatorStartTimeSelection", values);
96 /* Might become API */
97 static void gst_aggregator_merge_tags (GstAggregator * aggregator,
98 const GstTagList * tags, GstTagMergeMode mode);
99 static void gst_aggregator_set_latency_property (GstAggregator * agg,
101 static gint64 gst_aggregator_get_latency_property (GstAggregator * agg);
104 /* Locking order, locks in this element must always be taken in this order
106 * standard sink pad stream lock -> GST_PAD_STREAM_LOCK (aggpad)
107 * Aggregator pad flush lock -> PAD_FLUSH_LOCK(aggpad)
108 * standard src pad stream lock -> GST_PAD_STREAM_LOCK (srcpad)
109 * Aggregator src lock -> SRC_LOCK(agg) w/ SRC_WAIT/BROADCAST
110 * standard element object lock -> GST_OBJECT_LOCK(agg)
111 * Aggregator pad lock -> PAD_LOCK (aggpad) w/ PAD_WAIT/BROADCAST_EVENT(aggpad)
112 * standard src pad object lock -> GST_OBJECT_LOCK(srcpad)
113 * standard sink pad object lock -> GST_OBJECT_LOCK(aggpad)
117 static GstClockTime gst_aggregator_get_latency_unlocked (GstAggregator * self);
119 GST_DEBUG_CATEGORY_STATIC (aggregator_debug);
120 #define GST_CAT_DEFAULT aggregator_debug
122 /* GstAggregatorPad definitions */
123 #define PAD_LOCK(pad) G_STMT_START { \
124 GST_TRACE_OBJECT (pad, "Taking PAD lock from thread %p", \
126 g_mutex_lock(&pad->priv->lock); \
127 GST_TRACE_OBJECT (pad, "Took PAD lock from thread %p", \
131 #define PAD_UNLOCK(pad) G_STMT_START { \
132 GST_TRACE_OBJECT (pad, "Releasing PAD lock from thread %p", \
134 g_mutex_unlock(&pad->priv->lock); \
135 GST_TRACE_OBJECT (pad, "Release PAD lock from thread %p", \
140 #define PAD_WAIT_EVENT(pad) G_STMT_START { \
141 GST_LOG_OBJECT (pad, "Waiting for buffer to be consumed thread %p", \
143 g_cond_wait(&(((GstAggregatorPad* )pad)->priv->event_cond), \
144 (&((GstAggregatorPad*)pad)->priv->lock)); \
145 GST_LOG_OBJECT (pad, "DONE Waiting for buffer to be consumed on thread %p", \
149 #define PAD_BROADCAST_EVENT(pad) G_STMT_START { \
150 GST_LOG_OBJECT (pad, "Signaling buffer consumed from thread %p", \
152 g_cond_broadcast(&(((GstAggregatorPad* )pad)->priv->event_cond)); \
156 #define PAD_FLUSH_LOCK(pad) G_STMT_START { \
157 GST_TRACE_OBJECT (pad, "Taking lock from thread %p", \
159 g_mutex_lock(&pad->priv->flush_lock); \
160 GST_TRACE_OBJECT (pad, "Took lock from thread %p", \
164 #define PAD_FLUSH_UNLOCK(pad) G_STMT_START { \
165 GST_TRACE_OBJECT (pad, "Releasing lock from thread %p", \
167 g_mutex_unlock(&pad->priv->flush_lock); \
168 GST_TRACE_OBJECT (pad, "Release lock from thread %p", \
172 #define SRC_LOCK(self) G_STMT_START { \
173 GST_TRACE_OBJECT (self, "Taking src lock from thread %p", \
175 g_mutex_lock(&self->priv->src_lock); \
176 GST_TRACE_OBJECT (self, "Took src lock from thread %p", \
180 #define SRC_UNLOCK(self) G_STMT_START { \
181 GST_TRACE_OBJECT (self, "Releasing src lock from thread %p", \
183 g_mutex_unlock(&self->priv->src_lock); \
184 GST_TRACE_OBJECT (self, "Released src lock from thread %p", \
188 #define SRC_WAIT(self) G_STMT_START { \
189 GST_LOG_OBJECT (self, "Waiting for src on thread %p", \
191 g_cond_wait(&(self->priv->src_cond), &(self->priv->src_lock)); \
192 GST_LOG_OBJECT (self, "DONE Waiting for src on thread %p", \
196 #define SRC_BROADCAST(self) G_STMT_START { \
197 GST_LOG_OBJECT (self, "Signaling src from thread %p", \
199 if (self->priv->aggregate_id) \
200 gst_clock_id_unschedule (self->priv->aggregate_id); \
201 g_cond_broadcast(&(self->priv->src_cond)); \
204 struct _GstAggregatorPadPrivate
206 /* Following fields are protected by the PAD_LOCK */
207 GstFlowReturn flow_return;
208 gboolean pending_flush_start;
209 gboolean pending_flush_stop;
210 gboolean pending_eos;
212 gboolean first_buffer;
216 GstClockTime head_position;
217 GstClockTime tail_position;
218 GstClockTime head_time;
219 GstClockTime tail_time;
220 GstClockTime time_level;
226 /* This lock prevents a flush start processing happening while
227 * the chain function is also happening.
232 /* Must be called with PAD_LOCK held */
234 gst_aggregator_pad_reset_unlocked (GstAggregatorPad * aggpad)
236 aggpad->priv->pending_eos = FALSE;
237 aggpad->priv->eos = FALSE;
238 aggpad->priv->flow_return = GST_FLOW_OK;
239 GST_OBJECT_LOCK (aggpad);
240 gst_segment_init (&aggpad->segment, GST_FORMAT_UNDEFINED);
241 gst_segment_init (&aggpad->clip_segment, GST_FORMAT_UNDEFINED);
242 GST_OBJECT_UNLOCK (aggpad);
243 aggpad->priv->head_position = GST_CLOCK_TIME_NONE;
244 aggpad->priv->tail_position = GST_CLOCK_TIME_NONE;
245 aggpad->priv->head_time = GST_CLOCK_TIME_NONE;
246 aggpad->priv->tail_time = GST_CLOCK_TIME_NONE;
247 aggpad->priv->time_level = 0;
248 aggpad->priv->first_buffer = TRUE;
252 gst_aggregator_pad_flush (GstAggregatorPad * aggpad, GstAggregator * agg)
254 GstAggregatorPadClass *klass = GST_AGGREGATOR_PAD_GET_CLASS (aggpad);
257 gst_aggregator_pad_reset_unlocked (aggpad);
261 return klass->flush (aggpad, agg);
266 /*************************************
267 * GstAggregator implementation *
268 *************************************/
269 static GstElementClass *aggregator_parent_class = NULL;
271 /* All members are protected by the object lock unless otherwise noted */
273 struct _GstAggregatorPrivate
277 /* Our state is >= PAUSED */
278 gboolean running; /* protected by src_lock */
281 gboolean send_stream_start; /* protected by srcpad stream lock */
282 gboolean send_segment;
283 gboolean flush_seeking;
284 gboolean pending_flush_start;
285 gboolean send_eos; /* protected by srcpad stream lock */
287 GstCaps *srccaps; /* protected by the srcpad stream lock */
290 gboolean tags_changed;
292 gboolean peer_latency_live; /* protected by src_lock */
293 GstClockTime peer_latency_min; /* protected by src_lock */
294 GstClockTime peer_latency_max; /* protected by src_lock */
295 gboolean has_peer_latency; /* protected by src_lock */
297 GstClockTime sub_latency_min; /* protected by src_lock */
298 GstClockTime sub_latency_max; /* protected by src_lock */
301 GstClockID aggregate_id; /* protected by src_lock */
305 gboolean first_buffer; /* protected by object lock */
306 GstAggregatorStartTimeSelection start_time_selection;
307 GstClockTime start_time;
310 gint64 latency; /* protected by both src_lock and all pad locks */
318 gboolean only_to_active_pads;
320 gboolean one_actually_seeked;
323 #define DEFAULT_LATENCY 0
324 #define DEFAULT_START_TIME_SELECTION GST_AGGREGATOR_START_TIME_SELECTION_ZERO
325 #define DEFAULT_START_TIME (-1)
331 PROP_START_TIME_SELECTION,
336 static GstFlowReturn gst_aggregator_pad_chain_internal (GstAggregator * self,
337 GstAggregatorPad * aggpad, GstBuffer * buffer, gboolean head);
340 * gst_aggregator_iterate_sinkpads:
341 * @self: The #GstAggregator
342 * @func: (scope call): The function to call.
343 * @user_data: (closure): The data to pass to @func.
345 * Iterate the sinkpads of aggregator to call a function on them.
347 * This method guarantees that @func will be called only once for each
351 gst_aggregator_iterate_sinkpads (GstAggregator * self,
352 GstAggregatorPadForeachFunc func, gpointer user_data)
354 gboolean result = FALSE;
356 gboolean done = FALSE;
357 GValue item = { 0, };
358 GList *seen_pads = NULL;
360 iter = gst_element_iterate_sink_pads (GST_ELEMENT (self));
366 switch (gst_iterator_next (iter, &item)) {
367 case GST_ITERATOR_OK:
369 GstAggregatorPad *pad;
371 pad = g_value_get_object (&item);
373 /* if already pushed, skip. FIXME, find something faster to tag pads */
374 if (pad == NULL || g_list_find (seen_pads, pad)) {
375 g_value_reset (&item);
379 GST_LOG_OBJECT (pad, "calling function %s on pad",
380 GST_DEBUG_FUNCPTR_NAME (func));
382 result = func (self, pad, user_data);
386 seen_pads = g_list_prepend (seen_pads, pad);
388 g_value_reset (&item);
391 case GST_ITERATOR_RESYNC:
392 gst_iterator_resync (iter);
394 case GST_ITERATOR_ERROR:
395 GST_ERROR_OBJECT (self,
396 "Could not iterate over internally linked pads");
399 case GST_ITERATOR_DONE:
404 g_value_unset (&item);
405 gst_iterator_free (iter);
407 if (seen_pads == NULL) {
408 GST_DEBUG_OBJECT (self, "No pad seen");
412 g_list_free (seen_pads);
419 gst_aggregator_pad_queue_is_empty (GstAggregatorPad * pad)
421 return (g_queue_peek_tail (&pad->priv->buffers) == NULL);
425 gst_aggregator_check_pads_ready (GstAggregator * self)
427 GstAggregatorPad *pad;
429 gboolean have_data = TRUE;
431 GST_LOG_OBJECT (self, "checking pads");
433 GST_OBJECT_LOCK (self);
435 sinkpads = GST_ELEMENT_CAST (self)->sinkpads;
436 if (sinkpads == NULL)
439 for (l = sinkpads; l != NULL; l = l->next) {
444 if (gst_aggregator_pad_queue_is_empty (pad)) {
445 if (!pad->priv->eos) {
448 /* If not live we need data on all pads, so leave the loop */
449 if (!self->priv->peer_latency_live) {
454 } else if (self->priv->peer_latency_live) {
455 /* In live mode, having a single pad with buffers is enough to
456 * generate a start time from it. In non-live mode all pads need
459 self->priv->first_buffer = FALSE;
468 self->priv->first_buffer = FALSE;
470 GST_OBJECT_UNLOCK (self);
471 GST_LOG_OBJECT (self, "pads are ready");
476 GST_LOG_OBJECT (self, "pads not ready: no sink pads");
477 GST_OBJECT_UNLOCK (self);
482 GST_LOG_OBJECT (pad, "pad not ready to be aggregated yet");
483 GST_OBJECT_UNLOCK (self);
489 gst_aggregator_reset_flow_values (GstAggregator * self)
491 GST_OBJECT_LOCK (self);
492 self->priv->send_stream_start = TRUE;
493 self->priv->send_segment = TRUE;
494 gst_segment_init (&self->segment, GST_FORMAT_TIME);
495 self->priv->first_buffer = TRUE;
496 GST_OBJECT_UNLOCK (self);
500 gst_aggregator_push_mandatory_events (GstAggregator * self)
502 GstAggregatorPrivate *priv = self->priv;
503 GstEvent *segment = NULL;
504 GstEvent *tags = NULL;
506 if (self->priv->send_stream_start) {
509 GST_INFO_OBJECT (self, "pushing stream start");
510 /* stream-start (FIXME: create id based on input ids) */
511 g_snprintf (s_id, sizeof (s_id), "agg-%08x", g_random_int ());
512 if (!gst_pad_push_event (self->srcpad, gst_event_new_stream_start (s_id))) {
513 GST_WARNING_OBJECT (self->srcpad, "Sending stream start event failed");
515 self->priv->send_stream_start = FALSE;
518 if (self->priv->srccaps) {
520 GST_INFO_OBJECT (self, "pushing caps: %" GST_PTR_FORMAT,
521 self->priv->srccaps);
522 if (!gst_pad_push_event (self->srcpad,
523 gst_event_new_caps (self->priv->srccaps))) {
524 GST_WARNING_OBJECT (self->srcpad, "Sending caps event failed");
526 gst_caps_unref (self->priv->srccaps);
527 self->priv->srccaps = NULL;
530 GST_OBJECT_LOCK (self);
531 if (self->priv->send_segment && !self->priv->flush_seeking) {
532 segment = gst_event_new_segment (&self->segment);
534 if (!self->priv->seqnum)
535 self->priv->seqnum = gst_event_get_seqnum (segment);
537 gst_event_set_seqnum (segment, self->priv->seqnum);
538 self->priv->send_segment = FALSE;
540 GST_DEBUG_OBJECT (self, "pushing segment %" GST_PTR_FORMAT, segment);
543 if (priv->tags && priv->tags_changed && !self->priv->flush_seeking) {
544 tags = gst_event_new_tag (gst_tag_list_ref (priv->tags));
545 priv->tags_changed = FALSE;
547 GST_OBJECT_UNLOCK (self);
550 gst_pad_push_event (self->srcpad, segment);
552 gst_pad_push_event (self->srcpad, tags);
557 * gst_aggregator_set_src_caps:
558 * @self: The #GstAggregator
559 * @caps: The #GstCaps to set on the src pad.
561 * Sets the caps to be used on the src pad.
564 gst_aggregator_set_src_caps (GstAggregator * self, GstCaps * caps)
566 GST_PAD_STREAM_LOCK (self->srcpad);
567 gst_caps_replace (&self->priv->srccaps, caps);
568 gst_aggregator_push_mandatory_events (self);
569 GST_PAD_STREAM_UNLOCK (self->srcpad);
573 * gst_aggregator_finish_buffer:
574 * @self: The #GstAggregator
575 * @buffer: (transfer full): the #GstBuffer to push.
577 * This method will push the provided output buffer downstream. If needed,
578 * mandatory events such as stream-start, caps, and segment events will be
579 * sent before pushing the buffer.
582 gst_aggregator_finish_buffer (GstAggregator * self, GstBuffer * buffer)
584 gst_aggregator_push_mandatory_events (self);
586 GST_OBJECT_LOCK (self);
587 if (!self->priv->flush_seeking && gst_pad_is_active (self->srcpad)) {
588 GST_TRACE_OBJECT (self, "pushing buffer %" GST_PTR_FORMAT, buffer);
589 GST_OBJECT_UNLOCK (self);
590 return gst_pad_push (self->srcpad, buffer);
592 GST_INFO_OBJECT (self, "Not pushing (active: %i, flushing: %i)",
593 self->priv->flush_seeking, gst_pad_is_active (self->srcpad));
594 GST_OBJECT_UNLOCK (self);
595 gst_buffer_unref (buffer);
601 gst_aggregator_push_eos (GstAggregator * self)
604 gst_aggregator_push_mandatory_events (self);
606 event = gst_event_new_eos ();
608 GST_OBJECT_LOCK (self);
609 self->priv->send_eos = FALSE;
610 gst_event_set_seqnum (event, self->priv->seqnum);
611 GST_OBJECT_UNLOCK (self);
613 gst_pad_push_event (self->srcpad, event);
617 gst_aggregator_get_next_time (GstAggregator * self)
619 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (self);
621 if (klass->get_next_time)
622 return klass->get_next_time (self);
624 return GST_CLOCK_TIME_NONE;
628 gst_aggregator_wait_and_check (GstAggregator * self, gboolean * timeout)
630 GstClockTime latency;
638 latency = gst_aggregator_get_latency_unlocked (self);
640 if (gst_aggregator_check_pads_ready (self)) {
641 GST_DEBUG_OBJECT (self, "all pads have data");
647 /* Before waiting, check if we're actually still running */
648 if (!self->priv->running || !self->priv->send_eos) {
654 start = gst_aggregator_get_next_time (self);
656 /* If we're not live, or if we use the running time
657 * of the first buffer as start time, we wait until
658 * all pads have buffers.
659 * Otherwise (i.e. if we are live!), we wait on the clock
660 * and if a pad does not have a buffer in time we ignore
663 GST_OBJECT_LOCK (self);
664 if (!GST_CLOCK_TIME_IS_VALID (latency) ||
665 !GST_IS_CLOCK (GST_ELEMENT_CLOCK (self)) ||
666 !GST_CLOCK_TIME_IS_VALID (start) ||
667 (self->priv->first_buffer
668 && self->priv->start_time_selection ==
669 GST_AGGREGATOR_START_TIME_SELECTION_FIRST)) {
670 /* We wake up here when something happened, and below
671 * then check if we're ready now. If we return FALSE,
672 * we will be directly called again.
674 GST_OBJECT_UNLOCK (self);
677 GstClockTime base_time, time;
679 GstClockReturn status;
680 GstClockTimeDiff jitter;
682 GST_DEBUG_OBJECT (self, "got subclass start time: %" GST_TIME_FORMAT,
683 GST_TIME_ARGS (start));
685 base_time = GST_ELEMENT_CAST (self)->base_time;
686 clock = gst_object_ref (GST_ELEMENT_CLOCK (self));
687 GST_OBJECT_UNLOCK (self);
689 time = base_time + start;
692 GST_DEBUG_OBJECT (self, "possibly waiting for clock to reach %"
693 GST_TIME_FORMAT " (base %" GST_TIME_FORMAT " start %" GST_TIME_FORMAT
694 " latency %" GST_TIME_FORMAT " current %" GST_TIME_FORMAT ")",
695 GST_TIME_ARGS (time),
696 GST_TIME_ARGS (base_time),
697 GST_TIME_ARGS (start), GST_TIME_ARGS (latency),
698 GST_TIME_ARGS (gst_clock_get_time (clock)));
700 self->priv->aggregate_id = gst_clock_new_single_shot_id (clock, time);
701 gst_object_unref (clock);
705 status = gst_clock_id_wait (self->priv->aggregate_id, &jitter);
708 if (self->priv->aggregate_id) {
709 gst_clock_id_unref (self->priv->aggregate_id);
710 self->priv->aggregate_id = NULL;
713 GST_DEBUG_OBJECT (self,
714 "clock returned %d (jitter: %" GST_STIME_FORMAT ")",
715 status, GST_STIME_ARGS (jitter));
718 if (status == GST_CLOCK_OK || status == GST_CLOCK_EARLY) {
725 res = gst_aggregator_check_pads_ready (self);
732 check_events (GstAggregator * self, GstAggregatorPad * pad, gpointer user_data)
734 GstEvent *event = NULL;
735 GstAggregatorClass *klass = NULL;
736 gboolean *processed_event = user_data;
742 if (gst_aggregator_pad_queue_is_empty (pad) && pad->priv->pending_eos) {
743 pad->priv->pending_eos = FALSE;
744 pad->priv->eos = TRUE;
746 if (GST_IS_EVENT (g_queue_peek_tail (&pad->priv->buffers))) {
747 event = g_queue_pop_tail (&pad->priv->buffers);
748 PAD_BROADCAST_EVENT (pad);
753 *processed_event = TRUE;
755 klass = GST_AGGREGATOR_GET_CLASS (self);
757 GST_LOG_OBJECT (pad, "Processing %" GST_PTR_FORMAT, event);
758 klass->sink_event (self, pad, event);
760 } while (event != NULL);
766 gst_aggregator_pad_set_flushing (GstAggregatorPad * aggpad,
767 GstFlowReturn flow_return, gboolean full)
772 if (flow_return == GST_FLOW_NOT_LINKED)
773 aggpad->priv->flow_return = MIN (flow_return, aggpad->priv->flow_return);
775 aggpad->priv->flow_return = flow_return;
777 item = g_queue_peek_head_link (&aggpad->priv->buffers);
779 GList *next = item->next;
781 /* In partial flush, we do like the pad, we get rid of non-sticky events
784 if (full || GST_IS_BUFFER (item->data) ||
785 GST_EVENT_TYPE (item->data) == GST_EVENT_EOS ||
786 GST_EVENT_TYPE (item->data) == GST_EVENT_SEGMENT ||
787 !GST_EVENT_IS_STICKY (item->data)) {
788 gst_mini_object_unref (item->data);
789 g_queue_delete_link (&aggpad->priv->buffers, item);
793 aggpad->priv->num_buffers = 0;
795 PAD_BROADCAST_EVENT (aggpad);
800 gst_aggregator_aggregate_func (GstAggregator * self)
802 GstAggregatorPrivate *priv = self->priv;
803 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (self);
804 gboolean timeout = FALSE;
806 if (self->priv->running == FALSE) {
807 GST_DEBUG_OBJECT (self, "Not running anymore");
811 GST_LOG_OBJECT (self, "Checking aggregate");
812 while (priv->send_eos && priv->running) {
813 GstFlowReturn flow_return;
814 gboolean processed_event = FALSE;
816 gst_aggregator_iterate_sinkpads (self, check_events, NULL);
818 if (!gst_aggregator_wait_and_check (self, &timeout))
821 gst_aggregator_iterate_sinkpads (self, check_events, &processed_event);
825 GST_TRACE_OBJECT (self, "Actually aggregating!");
826 flow_return = klass->aggregate (self, timeout);
828 GST_OBJECT_LOCK (self);
829 if (flow_return == GST_FLOW_FLUSHING && priv->flush_seeking) {
830 /* We don't want to set the pads to flushing, but we want to
831 * stop the thread, so just break here */
832 GST_OBJECT_UNLOCK (self);
835 GST_OBJECT_UNLOCK (self);
837 if (flow_return == GST_FLOW_EOS || flow_return == GST_FLOW_ERROR) {
838 gst_aggregator_push_eos (self);
841 GST_LOG_OBJECT (self, "flow return is %s", gst_flow_get_name (flow_return));
843 if (flow_return != GST_FLOW_OK) {
846 GST_OBJECT_LOCK (self);
847 for (item = GST_ELEMENT (self)->sinkpads; item; item = item->next) {
848 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (item->data);
850 gst_aggregator_pad_set_flushing (aggpad, flow_return, TRUE);
852 GST_OBJECT_UNLOCK (self);
857 /* Pause the task here, the only ways to get here are:
858 * 1) We're stopping, in which case the task is stopped anyway
859 * 2) We got a flow error above, in which case it might take
860 * some time to forward the flow return upstream and we
861 * would otherwise call the task function over and over
862 * again without doing anything
864 gst_pad_pause_task (self->srcpad);
868 gst_aggregator_start (GstAggregator * self)
870 GstAggregatorClass *klass;
873 self->priv->send_stream_start = TRUE;
874 self->priv->send_segment = TRUE;
875 self->priv->send_eos = TRUE;
876 self->priv->srccaps = NULL;
878 klass = GST_AGGREGATOR_GET_CLASS (self);
881 result = klass->start (self);
889 _check_pending_flush_stop (GstAggregatorPad * pad)
894 res = (!pad->priv->pending_flush_stop && !pad->priv->pending_flush_start);
901 gst_aggregator_stop_srcpad_task (GstAggregator * self, GstEvent * flush_start)
905 GST_INFO_OBJECT (self, "%s srcpad task",
906 flush_start ? "Pausing" : "Stopping");
909 self->priv->running = FALSE;
910 SRC_BROADCAST (self);
914 res = gst_pad_push_event (self->srcpad, flush_start);
917 gst_pad_stop_task (self->srcpad);
923 gst_aggregator_start_srcpad_task (GstAggregator * self)
925 GST_INFO_OBJECT (self, "Starting srcpad task");
927 self->priv->running = TRUE;
928 gst_pad_start_task (GST_PAD (self->srcpad),
929 (GstTaskFunction) gst_aggregator_aggregate_func, self, NULL);
933 gst_aggregator_flush (GstAggregator * self)
935 GstFlowReturn ret = GST_FLOW_OK;
936 GstAggregatorPrivate *priv = self->priv;
937 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (self);
939 GST_DEBUG_OBJECT (self, "Flushing everything");
940 GST_OBJECT_LOCK (self);
941 priv->send_segment = TRUE;
942 priv->flush_seeking = FALSE;
943 priv->tags_changed = FALSE;
944 GST_OBJECT_UNLOCK (self);
946 ret = klass->flush (self);
952 /* Called with GstAggregator's object lock held */
955 gst_aggregator_all_flush_stop_received_locked (GstAggregator * self)
958 GstAggregatorPad *tmppad;
960 for (tmp = GST_ELEMENT (self)->sinkpads; tmp; tmp = tmp->next) {
961 tmppad = (GstAggregatorPad *) tmp->data;
963 if (_check_pending_flush_stop (tmppad) == FALSE) {
964 GST_DEBUG_OBJECT (tmppad, "Is not last %i -- %i",
965 tmppad->priv->pending_flush_start, tmppad->priv->pending_flush_stop);
974 gst_aggregator_flush_start (GstAggregator * self, GstAggregatorPad * aggpad,
977 GstAggregatorPrivate *priv = self->priv;
978 GstAggregatorPadPrivate *padpriv = aggpad->priv;
980 gst_aggregator_pad_set_flushing (aggpad, GST_FLOW_FLUSHING, FALSE);
982 PAD_FLUSH_LOCK (aggpad);
984 if (padpriv->pending_flush_start) {
985 GST_DEBUG_OBJECT (aggpad, "Expecting FLUSH_STOP now");
987 padpriv->pending_flush_start = FALSE;
988 padpriv->pending_flush_stop = TRUE;
992 GST_OBJECT_LOCK (self);
993 if (priv->flush_seeking) {
994 /* If flush_seeking we forward the first FLUSH_START */
995 if (priv->pending_flush_start) {
996 priv->pending_flush_start = FALSE;
997 GST_OBJECT_UNLOCK (self);
999 GST_INFO_OBJECT (self, "Flushing, pausing srcpad task");
1000 gst_aggregator_stop_srcpad_task (self, event);
1002 GST_INFO_OBJECT (self, "Getting STREAM_LOCK while seeking");
1003 GST_PAD_STREAM_LOCK (self->srcpad);
1004 GST_LOG_OBJECT (self, "GOT STREAM_LOCK");
1007 GST_OBJECT_UNLOCK (self);
1008 gst_event_unref (event);
1011 GST_OBJECT_UNLOCK (self);
1012 gst_event_unref (event);
1014 PAD_FLUSH_UNLOCK (aggpad);
1017 /* Must be called with the the PAD_LOCK held */
1019 update_time_level (GstAggregatorPad * aggpad, gboolean head)
1022 if (GST_CLOCK_TIME_IS_VALID (aggpad->priv->head_position) &&
1023 aggpad->clip_segment.format == GST_FORMAT_TIME)
1024 aggpad->priv->head_time =
1025 gst_segment_to_running_time (&aggpad->clip_segment,
1026 GST_FORMAT_TIME, aggpad->priv->head_position);
1028 aggpad->priv->head_time = GST_CLOCK_TIME_NONE;
1030 if (!GST_CLOCK_TIME_IS_VALID (aggpad->priv->tail_time))
1031 aggpad->priv->tail_time = aggpad->priv->head_time;
1033 if (GST_CLOCK_TIME_IS_VALID (aggpad->priv->tail_position) &&
1034 aggpad->segment.format == GST_FORMAT_TIME)
1035 aggpad->priv->tail_time =
1036 gst_segment_to_running_time (&aggpad->segment,
1037 GST_FORMAT_TIME, aggpad->priv->tail_position);
1039 aggpad->priv->tail_time = aggpad->priv->head_time;
1042 if (aggpad->priv->head_time == GST_CLOCK_TIME_NONE ||
1043 aggpad->priv->tail_time == GST_CLOCK_TIME_NONE) {
1044 aggpad->priv->time_level = 0;
1048 if (aggpad->priv->tail_time > aggpad->priv->head_time)
1049 aggpad->priv->time_level = 0;
1051 aggpad->priv->time_level = aggpad->priv->head_time -
1052 aggpad->priv->tail_time;
1056 /* GstAggregator vmethods default implementations */
1058 gst_aggregator_default_sink_event (GstAggregator * self,
1059 GstAggregatorPad * aggpad, GstEvent * event)
1061 gboolean res = TRUE;
1062 GstPad *pad = GST_PAD (aggpad);
1063 GstAggregatorPrivate *priv = self->priv;
1065 switch (GST_EVENT_TYPE (event)) {
1066 case GST_EVENT_FLUSH_START:
1068 gst_aggregator_flush_start (self, aggpad, event);
1069 /* We forward only in one case: right after flush_seeking */
1073 case GST_EVENT_FLUSH_STOP:
1075 GST_DEBUG_OBJECT (aggpad, "Got FLUSH_STOP");
1077 gst_aggregator_pad_flush (aggpad, self);
1078 GST_OBJECT_LOCK (self);
1079 if (priv->flush_seeking) {
1080 g_atomic_int_set (&aggpad->priv->pending_flush_stop, FALSE);
1081 if (gst_aggregator_all_flush_stop_received_locked (self)) {
1082 GST_OBJECT_UNLOCK (self);
1083 /* That means we received FLUSH_STOP/FLUSH_STOP on
1084 * all sinkpads -- Seeking is Done... sending FLUSH_STOP */
1085 gst_aggregator_flush (self);
1086 gst_pad_push_event (self->srcpad, event);
1089 priv->send_eos = TRUE;
1090 SRC_BROADCAST (self);
1093 GST_INFO_OBJECT (self, "Releasing source pad STREAM_LOCK");
1094 GST_PAD_STREAM_UNLOCK (self->srcpad);
1095 gst_aggregator_start_srcpad_task (self);
1097 GST_OBJECT_UNLOCK (self);
1100 GST_OBJECT_UNLOCK (self);
1103 /* We never forward the event */
1108 GST_DEBUG_OBJECT (aggpad, "EOS");
1110 /* We still have a buffer, and we don't want the subclass to have to
1111 * check for it. Mark pending_eos, eos will be set when steal_buffer is
1116 if (gst_aggregator_pad_queue_is_empty (aggpad)) {
1117 aggpad->priv->eos = TRUE;
1119 aggpad->priv->pending_eos = TRUE;
1121 PAD_UNLOCK (aggpad);
1123 SRC_BROADCAST (self);
1127 case GST_EVENT_SEGMENT:
1130 GST_OBJECT_LOCK (aggpad);
1131 gst_event_copy_segment (event, &aggpad->segment);
1132 update_time_level (aggpad, FALSE);
1133 GST_OBJECT_UNLOCK (aggpad);
1134 PAD_UNLOCK (aggpad);
1136 GST_OBJECT_LOCK (self);
1137 self->priv->seqnum = gst_event_get_seqnum (event);
1138 GST_OBJECT_UNLOCK (self);
1141 case GST_EVENT_STREAM_START:
1147 GstClockTime pts, endpts;
1148 GstClockTime duration;
1151 gst_event_parse_gap (event, &pts, &duration);
1152 gapbuf = gst_buffer_new ();
1154 if (GST_CLOCK_TIME_IS_VALID (duration))
1155 endpts = pts + duration;
1157 endpts = GST_CLOCK_TIME_NONE;
1159 GST_OBJECT_LOCK (aggpad);
1160 res = gst_segment_clip (&aggpad->segment, GST_FORMAT_TIME, pts, endpts,
1162 GST_OBJECT_UNLOCK (aggpad);
1165 GST_WARNING_OBJECT (self, "GAP event outside segment, dropping");
1169 if (GST_CLOCK_TIME_IS_VALID (endpts) && GST_CLOCK_TIME_IS_VALID (pts))
1170 duration = endpts - pts;
1172 duration = GST_CLOCK_TIME_NONE;
1174 GST_BUFFER_PTS (gapbuf) = pts;
1175 GST_BUFFER_DURATION (gapbuf) = duration;
1176 GST_BUFFER_FLAG_SET (gapbuf, GST_BUFFER_FLAG_GAP);
1177 GST_BUFFER_FLAG_SET (gapbuf, GST_BUFFER_FLAG_DROPPABLE);
1179 if (gst_aggregator_pad_chain_internal (self, aggpad, gapbuf, FALSE) !=
1181 GST_WARNING_OBJECT (self, "Failed to chain gap buffer");
1191 gst_event_parse_tag (event, &tags);
1193 if (gst_tag_list_get_scope (tags) == GST_TAG_SCOPE_STREAM) {
1194 gst_aggregator_merge_tags (self, tags, GST_TAG_MERGE_REPLACE);
1195 gst_event_unref (event);
1207 GST_DEBUG_OBJECT (pad, "Forwarding event: %" GST_PTR_FORMAT, event);
1208 return gst_pad_event_default (pad, GST_OBJECT (self), event);
1211 GST_DEBUG_OBJECT (pad, "Eating event: %" GST_PTR_FORMAT, event);
1213 gst_event_unref (event);
1218 static inline gboolean
1219 gst_aggregator_stop_pad (GstAggregator * self, GstAggregatorPad * pad,
1220 gpointer unused_udata)
1222 gst_aggregator_pad_flush (pad, self);
1228 gst_aggregator_stop (GstAggregator * agg)
1230 GstAggregatorClass *klass;
1233 gst_aggregator_reset_flow_values (agg);
1235 gst_aggregator_iterate_sinkpads (agg, gst_aggregator_stop_pad, NULL);
1237 klass = GST_AGGREGATOR_GET_CLASS (agg);
1240 result = klass->stop (agg);
1244 agg->priv->has_peer_latency = FALSE;
1245 agg->priv->peer_latency_live = FALSE;
1246 agg->priv->peer_latency_min = agg->priv->peer_latency_max = FALSE;
1248 if (agg->priv->tags)
1249 gst_tag_list_unref (agg->priv->tags);
1250 agg->priv->tags = NULL;
1255 /* GstElement vmethods implementations */
1256 static GstStateChangeReturn
1257 gst_aggregator_change_state (GstElement * element, GstStateChange transition)
1259 GstStateChangeReturn ret;
1260 GstAggregator *self = GST_AGGREGATOR (element);
1262 switch (transition) {
1263 case GST_STATE_CHANGE_READY_TO_PAUSED:
1264 if (!gst_aggregator_start (self))
1272 GST_ELEMENT_CLASS (aggregator_parent_class)->change_state (element,
1273 transition)) == GST_STATE_CHANGE_FAILURE)
1277 switch (transition) {
1278 case GST_STATE_CHANGE_PAUSED_TO_READY:
1279 if (!gst_aggregator_stop (self)) {
1280 /* What to do in this case? Error out? */
1281 GST_ERROR_OBJECT (self, "Subclass failed to stop.");
1293 GST_ERROR_OBJECT (element, "parent failed state change");
1298 GST_ERROR_OBJECT (element, "Subclass failed to start");
1299 return GST_STATE_CHANGE_FAILURE;
1304 gst_aggregator_release_pad (GstElement * element, GstPad * pad)
1306 GstAggregator *self = GST_AGGREGATOR (element);
1307 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
1309 GST_INFO_OBJECT (pad, "Removing pad");
1312 gst_aggregator_pad_set_flushing (aggpad, GST_FLOW_FLUSHING, TRUE);
1313 gst_element_remove_pad (element, pad);
1315 self->priv->has_peer_latency = FALSE;
1316 SRC_BROADCAST (self);
1320 static GstAggregatorPad *
1321 gst_aggregator_default_create_new_pad (GstAggregator * self,
1322 GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps)
1324 GstAggregatorPad *agg_pad;
1325 GstAggregatorPrivate *priv = self->priv;
1329 if (templ->direction != GST_PAD_SINK ||
1330 g_strcmp0 (templ->name_template, "sink_%u") != 0)
1333 GST_OBJECT_LOCK (self);
1334 if (req_name == NULL || strlen (req_name) < 6
1335 || !g_str_has_prefix (req_name, "sink_")) {
1336 /* no name given when requesting the pad, use next available int */
1337 serial = ++priv->max_padserial;
1339 /* parse serial number from requested padname */
1340 serial = g_ascii_strtoull (&req_name[5], NULL, 10);
1341 if (serial > priv->max_padserial)
1342 priv->max_padserial = serial;
1345 name = g_strdup_printf ("sink_%u", serial);
1346 agg_pad = g_object_new (GST_AGGREGATOR_GET_CLASS (self)->sinkpads_type,
1347 "name", name, "direction", GST_PAD_SINK, "template", templ, NULL);
1350 GST_OBJECT_UNLOCK (self);
1357 GST_WARNING_OBJECT (self, "request new pad that is not a SINK pad\n");
1363 gst_aggregator_request_new_pad (GstElement * element,
1364 GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps)
1366 GstAggregator *self;
1367 GstAggregatorPad *agg_pad;
1368 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (element);
1369 GstAggregatorPrivate *priv = GST_AGGREGATOR (element)->priv;
1371 self = GST_AGGREGATOR (element);
1373 agg_pad = klass->create_new_pad (self, templ, req_name, caps);
1375 GST_ERROR_OBJECT (element, "Couldn't create new pad");
1379 GST_DEBUG_OBJECT (element, "Adding pad %s", GST_PAD_NAME (agg_pad));
1380 self->priv->has_peer_latency = FALSE;
1383 gst_pad_set_active (GST_PAD (agg_pad), TRUE);
1385 /* add the pad to the element */
1386 gst_element_add_pad (element, GST_PAD (agg_pad));
1388 return GST_PAD (agg_pad);
1391 /* Must be called with SRC_LOCK held */
1394 gst_aggregator_query_latency_unlocked (GstAggregator * self, GstQuery * query)
1396 gboolean query_ret, live;
1397 GstClockTime our_latency, min, max;
1399 query_ret = gst_pad_query_default (self->srcpad, GST_OBJECT (self), query);
1402 GST_WARNING_OBJECT (self, "Latency query failed");
1406 gst_query_parse_latency (query, &live, &min, &max);
1408 our_latency = self->priv->latency;
1410 if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (min))) {
1411 GST_ERROR_OBJECT (self, "Invalid minimum latency %" GST_TIME_FORMAT
1412 ". Please file a bug at " PACKAGE_BUGREPORT ".", GST_TIME_ARGS (min));
1416 if (min > max && GST_CLOCK_TIME_IS_VALID (max)) {
1417 GST_ELEMENT_WARNING (self, CORE, CLOCK, (NULL),
1418 ("Impossible to configure latency: max %" GST_TIME_FORMAT " < min %"
1419 GST_TIME_FORMAT ". Add queues or other buffering elements.",
1420 GST_TIME_ARGS (max), GST_TIME_ARGS (min)));
1424 self->priv->peer_latency_live = live;
1425 self->priv->peer_latency_min = min;
1426 self->priv->peer_latency_max = max;
1427 self->priv->has_peer_latency = TRUE;
1431 min += self->priv->sub_latency_min;
1432 if (GST_CLOCK_TIME_IS_VALID (self->priv->sub_latency_max)
1433 && GST_CLOCK_TIME_IS_VALID (max))
1434 max += self->priv->sub_latency_max + our_latency;
1436 max = GST_CLOCK_TIME_NONE;
1438 SRC_BROADCAST (self);
1440 GST_DEBUG_OBJECT (self, "configured latency live:%s min:%" G_GINT64_FORMAT
1441 " max:%" G_GINT64_FORMAT, live ? "true" : "false", min, max);
1443 gst_query_set_latency (query, live, min, max);
1449 * MUST be called with the src_lock held.
1451 * See gst_aggregator_get_latency() for doc
1454 gst_aggregator_get_latency_unlocked (GstAggregator * self)
1456 GstClockTime latency;
1458 g_return_val_if_fail (GST_IS_AGGREGATOR (self), 0);
1460 if (!self->priv->has_peer_latency) {
1461 GstQuery *query = gst_query_new_latency ();
1464 ret = gst_aggregator_query_latency_unlocked (self, query);
1465 gst_query_unref (query);
1467 return GST_CLOCK_TIME_NONE;
1470 if (!self->priv->has_peer_latency || !self->priv->peer_latency_live)
1471 return GST_CLOCK_TIME_NONE;
1473 /* latency_min is never GST_CLOCK_TIME_NONE by construction */
1474 latency = self->priv->peer_latency_min;
1477 latency += self->priv->latency;
1478 latency += self->priv->sub_latency_min;
1484 * gst_aggregator_get_latency:
1485 * @self: a #GstAggregator
1487 * Retrieves the latency values reported by @self in response to the latency
1488 * query, or %GST_CLOCK_TIME_NONE if there is not live source connected and the element
1489 * will not wait for the clock.
1491 * Typically only called by subclasses.
1493 * Returns: The latency or %GST_CLOCK_TIME_NONE if the element does not sync
1496 gst_aggregator_get_latency (GstAggregator * self)
1501 ret = gst_aggregator_get_latency_unlocked (self);
1508 gst_aggregator_send_event (GstElement * element, GstEvent * event)
1510 GstAggregator *self = GST_AGGREGATOR (element);
1512 GST_STATE_LOCK (element);
1513 if (GST_EVENT_TYPE (event) == GST_EVENT_SEEK &&
1514 GST_STATE (element) < GST_STATE_PAUSED) {
1518 GstSeekType start_type, stop_type;
1521 gst_event_parse_seek (event, &rate, &fmt, &flags, &start_type,
1522 &start, &stop_type, &stop);
1524 GST_OBJECT_LOCK (self);
1525 gst_segment_do_seek (&self->segment, rate, fmt, flags, start_type, start,
1526 stop_type, stop, NULL);
1527 self->priv->seqnum = gst_event_get_seqnum (event);
1528 self->priv->first_buffer = FALSE;
1529 GST_OBJECT_UNLOCK (self);
1531 GST_DEBUG_OBJECT (element, "Storing segment %" GST_PTR_FORMAT, event);
1533 GST_STATE_UNLOCK (element);
1536 return GST_ELEMENT_CLASS (aggregator_parent_class)->send_event (element,
1541 gst_aggregator_default_src_query (GstAggregator * self, GstQuery * query)
1543 gboolean res = TRUE;
1545 switch (GST_QUERY_TYPE (query)) {
1546 case GST_QUERY_SEEKING:
1550 /* don't pass it along as some (file)sink might claim it does
1551 * whereas with a collectpads in between that will not likely work */
1552 gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
1553 gst_query_set_seeking (query, format, FALSE, 0, -1);
1558 case GST_QUERY_LATENCY:
1560 res = gst_aggregator_query_latency_unlocked (self, query);
1564 return gst_pad_query_default (self->srcpad, GST_OBJECT (self), query);
1571 gst_aggregator_event_forward_func (GstPad * pad, gpointer user_data)
1573 EventData *evdata = user_data;
1574 gboolean ret = TRUE;
1575 GstPad *peer = gst_pad_get_peer (pad);
1576 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
1579 if (evdata->only_to_active_pads && aggpad->priv->first_buffer) {
1580 GST_DEBUG_OBJECT (pad, "not sending event to inactive pad");
1583 ret = gst_pad_send_event (peer, gst_event_ref (evdata->event));
1584 GST_DEBUG_OBJECT (pad, "return of event push is %d", ret);
1585 gst_object_unref (peer);
1590 if (GST_EVENT_TYPE (evdata->event) == GST_EVENT_SEEK) {
1591 GstQuery *seeking = gst_query_new_seeking (GST_FORMAT_TIME);
1593 GST_DEBUG_OBJECT (pad, "Event %" GST_PTR_FORMAT " failed", evdata->event);
1595 if (gst_pad_query (peer, seeking)) {
1598 gst_query_parse_seeking (seeking, NULL, &seekable, NULL, NULL);
1600 if (seekable == FALSE) {
1601 GST_INFO_OBJECT (pad,
1602 "Source not seekable, We failed but it does not matter!");
1607 GST_ERROR_OBJECT (pad, "Query seeking FAILED");
1610 gst_query_unref (seeking);
1613 if (evdata->flush) {
1615 aggpad->priv->pending_flush_start = FALSE;
1616 aggpad->priv->pending_flush_stop = FALSE;
1617 PAD_UNLOCK (aggpad);
1620 evdata->one_actually_seeked = TRUE;
1623 evdata->result &= ret;
1625 /* Always send to all pads */
1630 gst_aggregator_forward_event_to_all_sinkpads (GstAggregator * self,
1631 GstEvent * event, gboolean flush, gboolean only_to_active_pads)
1635 evdata.event = event;
1636 evdata.result = TRUE;
1637 evdata.flush = flush;
1638 evdata.one_actually_seeked = FALSE;
1639 evdata.only_to_active_pads = only_to_active_pads;
1641 /* We first need to set all pads as flushing in a first pass
1642 * as flush_start flush_stop is sometimes sent synchronously
1643 * while we send the seek event */
1647 GST_OBJECT_LOCK (self);
1648 for (l = GST_ELEMENT_CAST (self)->sinkpads; l != NULL; l = l->next) {
1649 GstAggregatorPad *pad = l->data;
1652 pad->priv->pending_flush_start = TRUE;
1653 pad->priv->pending_flush_stop = FALSE;
1656 GST_OBJECT_UNLOCK (self);
1659 gst_pad_forward (self->srcpad, gst_aggregator_event_forward_func, &evdata);
1661 gst_event_unref (event);
1667 gst_aggregator_do_seek (GstAggregator * self, GstEvent * event)
1672 GstSeekType start_type, stop_type;
1676 GstAggregatorPrivate *priv = self->priv;
1678 gst_event_parse_seek (event, &rate, &fmt, &flags, &start_type,
1679 &start, &stop_type, &stop);
1681 GST_INFO_OBJECT (self, "starting SEEK");
1683 flush = flags & GST_SEEK_FLAG_FLUSH;
1685 GST_OBJECT_LOCK (self);
1687 priv->pending_flush_start = TRUE;
1688 priv->flush_seeking = TRUE;
1691 gst_segment_do_seek (&self->segment, rate, fmt, flags, start_type, start,
1692 stop_type, stop, NULL);
1694 /* Seeking sets a position */
1695 self->priv->first_buffer = FALSE;
1696 GST_OBJECT_UNLOCK (self);
1698 /* forward the seek upstream */
1700 gst_aggregator_forward_event_to_all_sinkpads (self, event, flush, FALSE);
1703 if (!evdata.result || !evdata.one_actually_seeked) {
1704 GST_OBJECT_LOCK (self);
1705 priv->flush_seeking = FALSE;
1706 priv->pending_flush_start = FALSE;
1707 GST_OBJECT_UNLOCK (self);
1710 GST_INFO_OBJECT (self, "seek done, result: %d", evdata.result);
1712 return evdata.result;
1716 gst_aggregator_default_src_event (GstAggregator * self, GstEvent * event)
1719 gboolean res = TRUE;
1721 switch (GST_EVENT_TYPE (event)) {
1722 case GST_EVENT_SEEK:
1724 gst_event_ref (event);
1725 res = gst_aggregator_do_seek (self, event);
1726 gst_event_unref (event);
1730 case GST_EVENT_NAVIGATION:
1732 /* navigation is rather pointless. */
1734 gst_event_unref (event);
1743 /* Don't forward QOS events to pads that had no active buffer yet. Otherwise
1744 * they will receive a QOS event that has earliest_time=0 (because we can't
1745 * have negative timestamps), and consider their buffer as too late */
1747 gst_aggregator_forward_event_to_all_sinkpads (self, event, FALSE,
1748 GST_EVENT_TYPE (event) == GST_EVENT_QOS);
1749 res = evdata.result;
1756 gst_aggregator_src_pad_event_func (GstPad * pad, GstObject * parent,
1759 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
1761 return klass->src_event (GST_AGGREGATOR (parent), event);
1765 gst_aggregator_src_pad_query_func (GstPad * pad, GstObject * parent,
1768 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
1770 return klass->src_query (GST_AGGREGATOR (parent), query);
1774 gst_aggregator_src_pad_activate_mode_func (GstPad * pad,
1775 GstObject * parent, GstPadMode mode, gboolean active)
1777 GstAggregator *self = GST_AGGREGATOR (parent);
1778 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
1780 if (klass->src_activate) {
1781 if (klass->src_activate (self, mode, active) == FALSE) {
1786 if (active == TRUE) {
1788 case GST_PAD_MODE_PUSH:
1790 GST_INFO_OBJECT (pad, "Activating pad!");
1791 gst_aggregator_start_srcpad_task (self);
1796 GST_ERROR_OBJECT (pad, "Only supported mode is PUSH");
1803 GST_INFO_OBJECT (self, "Deactivating srcpad");
1804 gst_aggregator_stop_srcpad_task (self, FALSE);
1810 gst_aggregator_default_sink_query (GstAggregator * self,
1811 GstAggregatorPad * aggpad, GstQuery * query)
1813 GstPad *pad = GST_PAD (aggpad);
1815 return gst_pad_query_default (pad, GST_OBJECT (self), query);
1819 gst_aggregator_finalize (GObject * object)
1821 GstAggregator *self = (GstAggregator *) object;
1823 g_mutex_clear (&self->priv->src_lock);
1824 g_cond_clear (&self->priv->src_cond);
1826 G_OBJECT_CLASS (aggregator_parent_class)->finalize (object);
1830 * gst_aggregator_set_latency_property:
1831 * @agg: a #GstAggregator
1832 * @latency: the new latency value (in nanoseconds).
1834 * Sets the new latency value to @latency. This value is used to limit the
1835 * amount of time a pad waits for data to appear before considering the pad
1839 gst_aggregator_set_latency_property (GstAggregator * self, gint64 latency)
1843 g_return_if_fail (GST_IS_AGGREGATOR (self));
1844 g_return_if_fail (GST_CLOCK_TIME_IS_VALID (latency));
1847 changed = (self->priv->latency != latency);
1852 GST_OBJECT_LOCK (self);
1853 /* First lock all the pads */
1854 for (item = GST_ELEMENT_CAST (self)->sinkpads; item; item = item->next) {
1855 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (item->data);
1859 self->priv->latency = latency;
1861 SRC_BROADCAST (self);
1863 /* Now wake up the pads */
1864 for (item = GST_ELEMENT_CAST (self)->sinkpads; item; item = item->next) {
1865 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (item->data);
1866 PAD_BROADCAST_EVENT (aggpad);
1867 PAD_UNLOCK (aggpad);
1869 GST_OBJECT_UNLOCK (self);
1875 gst_element_post_message (GST_ELEMENT_CAST (self),
1876 gst_message_new_latency (GST_OBJECT_CAST (self)));
1880 * gst_aggregator_get_latency_property:
1881 * @agg: a #GstAggregator
1883 * Gets the latency value. See gst_aggregator_set_latency for
1886 * Returns: The time in nanoseconds to wait for data to arrive on a sink pad
1887 * before a pad is deemed unresponsive. A value of -1 means an
1891 gst_aggregator_get_latency_property (GstAggregator * agg)
1895 g_return_val_if_fail (GST_IS_AGGREGATOR (agg), -1);
1897 GST_OBJECT_LOCK (agg);
1898 res = agg->priv->latency;
1899 GST_OBJECT_UNLOCK (agg);
1905 gst_aggregator_set_property (GObject * object, guint prop_id,
1906 const GValue * value, GParamSpec * pspec)
1908 GstAggregator *agg = GST_AGGREGATOR (object);
1912 gst_aggregator_set_latency_property (agg, g_value_get_int64 (value));
1914 case PROP_START_TIME_SELECTION:
1915 agg->priv->start_time_selection = g_value_get_enum (value);
1917 case PROP_START_TIME:
1918 agg->priv->start_time = g_value_get_uint64 (value);
1921 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1927 gst_aggregator_get_property (GObject * object, guint prop_id,
1928 GValue * value, GParamSpec * pspec)
1930 GstAggregator *agg = GST_AGGREGATOR (object);
1934 g_value_set_int64 (value, gst_aggregator_get_latency_property (agg));
1936 case PROP_START_TIME_SELECTION:
1937 g_value_set_enum (value, agg->priv->start_time_selection);
1939 case PROP_START_TIME:
1940 g_value_set_uint64 (value, agg->priv->start_time);
1943 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1948 /* GObject vmethods implementations */
1950 gst_aggregator_class_init (GstAggregatorClass * klass)
1952 GObjectClass *gobject_class = (GObjectClass *) klass;
1953 GstElementClass *gstelement_class = (GstElementClass *) klass;
1955 aggregator_parent_class = g_type_class_peek_parent (klass);
1956 g_type_class_add_private (klass, sizeof (GstAggregatorPrivate));
1958 GST_DEBUG_CATEGORY_INIT (aggregator_debug, "aggregator",
1959 GST_DEBUG_FG_MAGENTA, "GstAggregator");
1961 klass->sinkpads_type = GST_TYPE_AGGREGATOR_PAD;
1963 klass->sink_event = gst_aggregator_default_sink_event;
1964 klass->sink_query = gst_aggregator_default_sink_query;
1966 klass->src_event = gst_aggregator_default_src_event;
1967 klass->src_query = gst_aggregator_default_src_query;
1969 klass->create_new_pad = gst_aggregator_default_create_new_pad;
1971 gstelement_class->request_new_pad =
1972 GST_DEBUG_FUNCPTR (gst_aggregator_request_new_pad);
1973 gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_aggregator_send_event);
1974 gstelement_class->release_pad =
1975 GST_DEBUG_FUNCPTR (gst_aggregator_release_pad);
1976 gstelement_class->change_state =
1977 GST_DEBUG_FUNCPTR (gst_aggregator_change_state);
1979 gobject_class->set_property = gst_aggregator_set_property;
1980 gobject_class->get_property = gst_aggregator_get_property;
1981 gobject_class->finalize = gst_aggregator_finalize;
1983 g_object_class_install_property (gobject_class, PROP_LATENCY,
1984 g_param_spec_int64 ("latency", "Buffer latency",
1985 "Additional latency in live mode to allow upstream "
1986 "to take longer to produce buffers for the current "
1987 "position (in nanoseconds)", 0,
1988 (G_MAXLONG == G_MAXINT64) ? G_MAXINT64 : (G_MAXLONG * GST_SECOND - 1),
1989 DEFAULT_LATENCY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1991 g_object_class_install_property (gobject_class, PROP_START_TIME_SELECTION,
1992 g_param_spec_enum ("start-time-selection", "Start Time Selection",
1993 "Decides which start time is output",
1994 gst_aggregator_start_time_selection_get_type (),
1995 DEFAULT_START_TIME_SELECTION,
1996 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1998 g_object_class_install_property (gobject_class, PROP_START_TIME,
1999 g_param_spec_uint64 ("start-time", "Start Time",
2000 "Start time to use if start-time-selection=set", 0,
2002 DEFAULT_START_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
2004 GST_DEBUG_REGISTER_FUNCPTR (gst_aggregator_stop_pad);
2008 gst_aggregator_init (GstAggregator * self, GstAggregatorClass * klass)
2010 GstPadTemplate *pad_template;
2011 GstAggregatorPrivate *priv;
2013 g_return_if_fail (klass->aggregate != NULL);
2016 G_TYPE_INSTANCE_GET_PRIVATE (self, GST_TYPE_AGGREGATOR,
2017 GstAggregatorPrivate);
2022 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (klass), "src");
2023 g_return_if_fail (pad_template != NULL);
2025 priv->max_padserial = -1;
2026 priv->tags_changed = FALSE;
2028 self->priv->peer_latency_live = FALSE;
2029 self->priv->peer_latency_min = self->priv->sub_latency_min = 0;
2030 self->priv->peer_latency_max = self->priv->sub_latency_max = 0;
2031 self->priv->has_peer_latency = FALSE;
2032 gst_aggregator_reset_flow_values (self);
2034 self->srcpad = gst_pad_new_from_template (pad_template, "src");
2036 gst_pad_set_event_function (self->srcpad,
2037 GST_DEBUG_FUNCPTR (gst_aggregator_src_pad_event_func));
2038 gst_pad_set_query_function (self->srcpad,
2039 GST_DEBUG_FUNCPTR (gst_aggregator_src_pad_query_func));
2040 gst_pad_set_activatemode_function (self->srcpad,
2041 GST_DEBUG_FUNCPTR (gst_aggregator_src_pad_activate_mode_func));
2043 gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
2045 self->priv->latency = DEFAULT_LATENCY;
2046 self->priv->start_time_selection = DEFAULT_START_TIME_SELECTION;
2047 self->priv->start_time = DEFAULT_START_TIME;
2049 g_mutex_init (&self->priv->src_lock);
2050 g_cond_init (&self->priv->src_cond);
2053 /* we can't use G_DEFINE_ABSTRACT_TYPE because we need the klass in the _init
2054 * method to get to the padtemplates */
2056 gst_aggregator_get_type (void)
2058 static volatile gsize type = 0;
2060 if (g_once_init_enter (&type)) {
2062 static const GTypeInfo info = {
2063 sizeof (GstAggregatorClass),
2066 (GClassInitFunc) gst_aggregator_class_init,
2069 sizeof (GstAggregator),
2071 (GInstanceInitFunc) gst_aggregator_init,
2074 _type = g_type_register_static (GST_TYPE_ELEMENT,
2075 "GstAggregator", &info, G_TYPE_FLAG_ABSTRACT);
2076 g_once_init_leave (&type, _type);
2081 /* Must be called with SRC lock and PAD lock held */
2083 gst_aggregator_pad_has_space (GstAggregator * self, GstAggregatorPad * aggpad)
2085 /* Empty queue always has space */
2086 if (g_queue_get_length (&aggpad->priv->buffers) == 0)
2089 /* We also want at least two buffers, one is being processed and one is ready
2090 * for the next iteration when we operate in live mode. */
2091 if (self->priv->peer_latency_live && aggpad->priv->num_buffers < 2)
2094 /* zero latency, if there is a buffer, it's full */
2095 if (self->priv->latency == 0)
2098 /* Allow no more buffers than the latency */
2099 return (aggpad->priv->time_level <= self->priv->latency);
2102 /* Must be called with the PAD_LOCK held */
2104 apply_buffer (GstAggregatorPad * aggpad, GstBuffer * buffer, gboolean head)
2106 GstClockTime timestamp;
2108 if (GST_BUFFER_DTS_IS_VALID (buffer))
2109 timestamp = GST_BUFFER_DTS (buffer);
2111 timestamp = GST_BUFFER_PTS (buffer);
2113 if (timestamp == GST_CLOCK_TIME_NONE) {
2115 timestamp = aggpad->priv->head_position;
2117 timestamp = aggpad->priv->tail_position;
2121 if (GST_BUFFER_DURATION_IS_VALID (buffer))
2122 timestamp += GST_BUFFER_DURATION (buffer);
2125 aggpad->priv->head_position = timestamp;
2127 aggpad->priv->tail_position = timestamp;
2129 update_time_level (aggpad, head);
2132 static GstFlowReturn
2133 gst_aggregator_pad_chain_internal (GstAggregator * self,
2134 GstAggregatorPad * aggpad, GstBuffer * buffer, gboolean head)
2136 GstBuffer *actual_buf = buffer;
2137 GstAggregatorClass *aggclass = GST_AGGREGATOR_GET_CLASS (self);
2138 GstFlowReturn flow_return;
2139 GstClockTime buf_pts;
2141 GST_DEBUG_OBJECT (aggpad, "Start chaining a buffer %" GST_PTR_FORMAT, buffer);
2143 PAD_FLUSH_LOCK (aggpad);
2146 flow_return = aggpad->priv->flow_return;
2147 if (flow_return != GST_FLOW_OK)
2150 if (aggpad->priv->pending_eos == TRUE)
2153 PAD_UNLOCK (aggpad);
2155 if (aggclass->clip && head) {
2156 aggclass->clip (self, aggpad, buffer, &actual_buf);
2159 if (actual_buf == NULL) {
2160 GST_LOG_OBJECT (actual_buf, "Buffer dropped by clip function");
2164 buf_pts = GST_BUFFER_PTS (actual_buf);
2166 aggpad->priv->first_buffer = FALSE;
2170 GST_OBJECT_LOCK (self);
2172 if (gst_aggregator_pad_has_space (self, aggpad)
2173 && aggpad->priv->flow_return == GST_FLOW_OK) {
2175 g_queue_push_head (&aggpad->priv->buffers, actual_buf);
2177 g_queue_push_tail (&aggpad->priv->buffers, actual_buf);
2178 apply_buffer (aggpad, actual_buf, head);
2179 aggpad->priv->num_buffers++;
2180 actual_buf = buffer = NULL;
2181 SRC_BROADCAST (self);
2185 flow_return = aggpad->priv->flow_return;
2186 if (flow_return != GST_FLOW_OK) {
2187 GST_OBJECT_UNLOCK (self);
2191 GST_DEBUG_OBJECT (aggpad, "Waiting for buffer to be consumed");
2192 GST_OBJECT_UNLOCK (self);
2194 PAD_WAIT_EVENT (aggpad);
2196 PAD_UNLOCK (aggpad);
2199 if (self->priv->first_buffer) {
2200 GstClockTime start_time;
2202 switch (self->priv->start_time_selection) {
2203 case GST_AGGREGATOR_START_TIME_SELECTION_ZERO:
2207 case GST_AGGREGATOR_START_TIME_SELECTION_FIRST:
2208 GST_OBJECT_LOCK (aggpad);
2209 if (aggpad->segment.format == GST_FORMAT_TIME) {
2210 start_time = buf_pts;
2211 if (start_time != -1) {
2212 start_time = MAX (start_time, aggpad->segment.start);
2214 gst_segment_to_running_time (&aggpad->segment, GST_FORMAT_TIME,
2219 GST_WARNING_OBJECT (aggpad,
2220 "Ignoring request of selecting the first start time "
2221 "as the segment is a %s segment instead of a time segment",
2222 gst_format_get_name (aggpad->segment.format));
2224 GST_OBJECT_UNLOCK (aggpad);
2226 case GST_AGGREGATOR_START_TIME_SELECTION_SET:
2227 start_time = self->priv->start_time;
2228 if (start_time == -1)
2233 if (start_time != -1) {
2234 if (self->segment.position == -1)
2235 self->segment.position = start_time;
2237 self->segment.position = MIN (start_time, self->segment.position);
2239 GST_DEBUG_OBJECT (self, "Selecting start time %" GST_TIME_FORMAT,
2240 GST_TIME_ARGS (start_time));
2244 PAD_UNLOCK (aggpad);
2245 GST_OBJECT_UNLOCK (self);
2250 PAD_FLUSH_UNLOCK (aggpad);
2252 GST_DEBUG_OBJECT (aggpad, "Done chaining");
2257 PAD_UNLOCK (aggpad);
2258 PAD_FLUSH_UNLOCK (aggpad);
2260 GST_DEBUG_OBJECT (aggpad, "Pad is %s, dropping buffer",
2261 gst_flow_get_name (flow_return));
2263 gst_buffer_unref (buffer);
2268 PAD_UNLOCK (aggpad);
2269 PAD_FLUSH_UNLOCK (aggpad);
2271 gst_buffer_unref (buffer);
2272 GST_DEBUG_OBJECT (aggpad, "We are EOS already...");
2274 return GST_FLOW_EOS;
2277 static GstFlowReturn
2278 gst_aggregator_pad_chain (GstPad * pad, GstObject * object, GstBuffer * buffer)
2280 return gst_aggregator_pad_chain_internal (GST_AGGREGATOR_CAST (object),
2281 GST_AGGREGATOR_PAD_CAST (pad), buffer, TRUE);
2285 gst_aggregator_pad_query_func (GstPad * pad, GstObject * parent,
2288 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
2289 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
2291 if (GST_QUERY_IS_SERIALIZED (query)) {
2294 while (!gst_aggregator_pad_queue_is_empty (aggpad)
2295 && aggpad->priv->flow_return == GST_FLOW_OK) {
2296 GST_DEBUG_OBJECT (aggpad, "Waiting for buffer to be consumed");
2297 PAD_WAIT_EVENT (aggpad);
2300 if (aggpad->priv->flow_return != GST_FLOW_OK)
2303 PAD_UNLOCK (aggpad);
2306 return klass->sink_query (GST_AGGREGATOR (parent),
2307 GST_AGGREGATOR_PAD (pad), query);
2310 GST_DEBUG_OBJECT (aggpad, "Pad is %s, dropping query",
2311 gst_flow_get_name (aggpad->priv->flow_return));
2312 PAD_UNLOCK (aggpad);
2316 static GstFlowReturn
2317 gst_aggregator_pad_event_func (GstPad * pad, GstObject * parent,
2320 GstFlowReturn ret = GST_FLOW_OK;
2321 GstAggregator *self = GST_AGGREGATOR (parent);
2322 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
2323 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
2325 if (GST_EVENT_IS_SERIALIZED (event) && GST_EVENT_TYPE (event) != GST_EVENT_EOS
2326 /* && GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT_DONE */ ) {
2330 if (aggpad->priv->flow_return != GST_FLOW_OK
2331 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) {
2332 ret = aggpad->priv->flow_return;
2336 if (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
2337 GST_OBJECT_LOCK (aggpad);
2338 gst_event_copy_segment (event, &aggpad->clip_segment);
2339 aggpad->priv->head_position = aggpad->clip_segment.position;
2340 update_time_level (aggpad, TRUE);
2341 GST_OBJECT_UNLOCK (aggpad);
2344 if (!gst_aggregator_pad_queue_is_empty (aggpad) &&
2345 GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) {
2346 GST_DEBUG_OBJECT (aggpad, "Store event in queue: %" GST_PTR_FORMAT,
2348 g_queue_push_head (&aggpad->priv->buffers, event);
2350 SRC_BROADCAST (self);
2352 PAD_UNLOCK (aggpad);
2357 gboolean is_caps = (GST_EVENT_TYPE (event) == GST_EVENT_CAPS);
2359 if (!klass->sink_event (self, aggpad, event)) {
2360 /* Copied from GstPad to convert boolean to a GstFlowReturn in
2361 * the event handling func */
2362 ret = is_caps ? GST_FLOW_NOT_NEGOTIATED : GST_FLOW_ERROR;
2369 GST_DEBUG_OBJECT (aggpad, "Pad is %s, dropping event",
2370 gst_flow_get_name (aggpad->priv->flow_return));
2371 PAD_UNLOCK (aggpad);
2373 if (GST_EVENT_IS_STICKY (event))
2374 gst_pad_store_sticky_event (pad, event);
2375 gst_event_unref (event);
2381 gst_aggregator_pad_activate_mode_func (GstPad * pad,
2382 GstObject * parent, GstPadMode mode, gboolean active)
2384 GstAggregator *self = GST_AGGREGATOR (parent);
2385 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
2387 if (active == FALSE) {
2389 gst_aggregator_pad_set_flushing (aggpad, GST_FLOW_FLUSHING, TRUE);
2390 SRC_BROADCAST (self);
2394 aggpad->priv->flow_return = GST_FLOW_OK;
2395 PAD_BROADCAST_EVENT (aggpad);
2396 PAD_UNLOCK (aggpad);
2402 /***********************************
2403 * GstAggregatorPad implementation *
2404 ************************************/
2405 G_DEFINE_TYPE (GstAggregatorPad, gst_aggregator_pad, GST_TYPE_PAD);
2408 gst_aggregator_pad_constructed (GObject * object)
2410 GstPad *pad = GST_PAD (object);
2412 gst_pad_set_chain_function (pad,
2413 GST_DEBUG_FUNCPTR (gst_aggregator_pad_chain));
2414 gst_pad_set_event_full_function_full (pad,
2415 GST_DEBUG_FUNCPTR (gst_aggregator_pad_event_func), NULL, NULL);
2416 gst_pad_set_query_function (pad,
2417 GST_DEBUG_FUNCPTR (gst_aggregator_pad_query_func));
2418 gst_pad_set_activatemode_function (pad,
2419 GST_DEBUG_FUNCPTR (gst_aggregator_pad_activate_mode_func));
2423 gst_aggregator_pad_finalize (GObject * object)
2425 GstAggregatorPad *pad = (GstAggregatorPad *) object;
2427 g_cond_clear (&pad->priv->event_cond);
2428 g_mutex_clear (&pad->priv->flush_lock);
2429 g_mutex_clear (&pad->priv->lock);
2431 G_OBJECT_CLASS (gst_aggregator_pad_parent_class)->finalize (object);
2435 gst_aggregator_pad_dispose (GObject * object)
2437 GstAggregatorPad *pad = (GstAggregatorPad *) object;
2439 gst_aggregator_pad_set_flushing (pad, GST_FLOW_FLUSHING, TRUE);
2441 G_OBJECT_CLASS (gst_aggregator_pad_parent_class)->dispose (object);
2445 gst_aggregator_pad_class_init (GstAggregatorPadClass * klass)
2447 GObjectClass *gobject_class = (GObjectClass *) klass;
2449 g_type_class_add_private (klass, sizeof (GstAggregatorPadPrivate));
2451 gobject_class->constructed = gst_aggregator_pad_constructed;
2452 gobject_class->finalize = gst_aggregator_pad_finalize;
2453 gobject_class->dispose = gst_aggregator_pad_dispose;
2457 gst_aggregator_pad_init (GstAggregatorPad * pad)
2460 G_TYPE_INSTANCE_GET_PRIVATE (pad, GST_TYPE_AGGREGATOR_PAD,
2461 GstAggregatorPadPrivate);
2463 g_queue_init (&pad->priv->buffers);
2464 g_cond_init (&pad->priv->event_cond);
2466 g_mutex_init (&pad->priv->flush_lock);
2467 g_mutex_init (&pad->priv->lock);
2469 gst_aggregator_pad_reset_unlocked (pad);
2473 * gst_aggregator_pad_steal_buffer:
2474 * @pad: the pad to get buffer from
2476 * Steal the ref to the buffer currently queued in @pad.
2478 * Returns: (transfer full): The buffer in @pad or NULL if no buffer was
2479 * queued. You should unref the buffer after usage.
2482 gst_aggregator_pad_steal_buffer (GstAggregatorPad * pad)
2484 GstBuffer *buffer = NULL;
2487 if (GST_IS_BUFFER (g_queue_peek_tail (&pad->priv->buffers)))
2488 buffer = g_queue_pop_tail (&pad->priv->buffers);
2491 apply_buffer (pad, buffer, FALSE);
2492 pad->priv->num_buffers--;
2493 GST_TRACE_OBJECT (pad, "Consuming buffer");
2494 if (gst_aggregator_pad_queue_is_empty (pad) && pad->priv->pending_eos) {
2495 pad->priv->pending_eos = FALSE;
2496 pad->priv->eos = TRUE;
2498 PAD_BROADCAST_EVENT (pad);
2499 GST_DEBUG_OBJECT (pad, "Consumed: %" GST_PTR_FORMAT, buffer);
2507 * gst_aggregator_pad_drop_buffer:
2508 * @pad: the pad where to drop any pending buffer
2510 * Drop the buffer currently queued in @pad.
2512 * Returns: TRUE if there was a buffer queued in @pad, or FALSE if not.
2515 gst_aggregator_pad_drop_buffer (GstAggregatorPad * pad)
2519 buf = gst_aggregator_pad_steal_buffer (pad);
2524 gst_buffer_unref (buf);
2529 * gst_aggregator_pad_get_buffer:
2530 * @pad: the pad to get buffer from
2532 * Returns: (transfer full): A reference to the buffer in @pad or
2533 * NULL if no buffer was queued. You should unref the buffer after
2537 gst_aggregator_pad_get_buffer (GstAggregatorPad * pad)
2539 GstBuffer *buffer = NULL;
2542 buffer = g_queue_peek_tail (&pad->priv->buffers);
2543 /* The tail should always be a buffer, because if it is an event,
2544 * it will be consumed immeditaly in gst_aggregator_steal_buffer */
2546 if (GST_IS_BUFFER (buffer))
2547 gst_buffer_ref (buffer);
2556 gst_aggregator_pad_is_eos (GstAggregatorPad * pad)
2561 is_eos = pad->priv->eos;
2568 * gst_aggregator_merge_tags:
2569 * @self: a #GstAggregator
2570 * @tags: a #GstTagList to merge
2571 * @mode: the #GstTagMergeMode to use
2573 * Adds tags to so-called pending tags, which will be processed
2574 * before pushing out data downstream.
2576 * Note that this is provided for convenience, and the subclass is
2577 * not required to use this and can still do tag handling on its own.
2582 gst_aggregator_merge_tags (GstAggregator * self,
2583 const GstTagList * tags, GstTagMergeMode mode)
2587 g_return_if_fail (GST_IS_AGGREGATOR (self));
2588 g_return_if_fail (tags == NULL || GST_IS_TAG_LIST (tags));
2590 /* FIXME Check if we can use OBJECT lock here! */
2591 GST_OBJECT_LOCK (self);
2593 GST_DEBUG_OBJECT (self, "merging tags %" GST_PTR_FORMAT, tags);
2594 otags = self->priv->tags;
2595 self->priv->tags = gst_tag_list_merge (self->priv->tags, tags, mode);
2597 gst_tag_list_unref (otags);
2598 self->priv->tags_changed = TRUE;
2599 GST_OBJECT_UNLOCK (self);
2603 * gst_aggregator_set_latency:
2604 * @self: a #GstAggregator
2605 * @min_latency: minimum latency
2606 * @max_latency: maximum latency
2608 * Lets #GstAggregator sub-classes tell the baseclass what their internal
2609 * latency is. Will also post a LATENCY message on the bus so the pipeline
2610 * can reconfigure its global latency.
2613 gst_aggregator_set_latency (GstAggregator * self,
2614 GstClockTime min_latency, GstClockTime max_latency)
2616 gboolean changed = FALSE;
2618 g_return_if_fail (GST_IS_AGGREGATOR (self));
2619 g_return_if_fail (GST_CLOCK_TIME_IS_VALID (min_latency));
2620 g_return_if_fail (max_latency >= min_latency);
2623 if (self->priv->sub_latency_min != min_latency) {
2624 self->priv->sub_latency_min = min_latency;
2627 if (self->priv->sub_latency_max != max_latency) {
2628 self->priv->sub_latency_max = max_latency;
2633 SRC_BROADCAST (self);
2637 gst_element_post_message (GST_ELEMENT_CAST (self),
2638 gst_message_new_latency (GST_OBJECT_CAST (self)));