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: Base class for mixers and muxers, manages a set of input
26 * pads and aggregates their streams
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 * * Installs a #GstPadChainFunction, a #GstPadEventFullFunction and a
36 * #GstPadQueryFunction to queue all serialized data packets per sink pad.
37 * Subclasses should not overwrite those, but instead implement
38 * #GstAggregatorClass.sink_event() and #GstAggregatorClass.sink_query() as
41 * * When data is queued on all pads, the aggregate vmethod is called.
43 * * One can peek at the data on any given GstAggregatorPad with the
44 * gst_aggregator_pad_peek_buffer () method, and remove it from the pad
45 * with the gst_aggregator_pad_pop_buffer () method. When a buffer
46 * has been taken with pop_buffer (), a new buffer can be queued
49 * * If the subclass wishes to push a buffer downstream in its aggregate
50 * implementation, it should do so through the
51 * gst_aggregator_finish_buffer () method. This method will take care
52 * of sending and ordering mandatory events such as stream start, caps
55 * * Same goes for EOS events, which should not be pushed directly by the
56 * subclass, it should instead return GST_FLOW_EOS in its aggregate
59 * * Note that the aggregator logic regarding gap event handling is to turn
60 * these into gap buffers with matching PTS and duration. It will also
61 * flag these buffers with GST_BUFFER_FLAG_GAP and GST_BUFFER_FLAG_DROPPABLE
62 * to ease their identification and subsequent processing.
64 * * Subclasses must use (a subclass of) #GstAggregatorPad for both their
65 * sink and source pads.
66 * See gst_element_class_add_static_pad_template_with_gtype().
68 * This class used to live in gst-plugins-bad and was moved to core.
74 * SECTION: gstaggregatorpad
75 * @title: GstAggregatorPad
76 * @short_description: #GstPad subclass for pads managed by #GstAggregator
77 * @see_also: gstcollectpads for historical reasons.
79 * Pads managed by a #GstAggregor subclass.
81 * This class used to live in gst-plugins-bad and was moved to core.
90 #include <string.h> /* strlen */
92 #include "gstaggregator.h"
96 GST_AGGREGATOR_START_TIME_SELECTION_ZERO,
97 GST_AGGREGATOR_START_TIME_SELECTION_FIRST,
98 GST_AGGREGATOR_START_TIME_SELECTION_SET
99 } GstAggregatorStartTimeSelection;
102 gst_aggregator_start_time_selection_get_type (void)
104 static GType gtype = 0;
107 static const GEnumValue values[] = {
108 {GST_AGGREGATOR_START_TIME_SELECTION_ZERO,
109 "Start at 0 running time (default)", "zero"},
110 {GST_AGGREGATOR_START_TIME_SELECTION_FIRST,
111 "Start at first observed input running time", "first"},
112 {GST_AGGREGATOR_START_TIME_SELECTION_SET,
113 "Set start time with start-time property", "set"},
117 gtype = g_enum_register_static ("GstAggregatorStartTimeSelection", values);
122 /* Might become API */
124 static void gst_aggregator_merge_tags (GstAggregator * aggregator,
125 const GstTagList * tags, GstTagMergeMode mode);
127 static void gst_aggregator_set_latency_property (GstAggregator * agg,
128 GstClockTime latency);
129 static GstClockTime gst_aggregator_get_latency_property (GstAggregator * agg);
131 static GstClockTime gst_aggregator_get_latency_unlocked (GstAggregator * self);
133 static void gst_aggregator_pad_buffer_consumed (GstAggregatorPad * pad);
135 GST_DEBUG_CATEGORY_STATIC (aggregator_debug);
136 #define GST_CAT_DEFAULT aggregator_debug
138 /* Locking order, locks in this element must always be taken in this order
140 * standard sink pad stream lock -> GST_PAD_STREAM_LOCK (aggpad)
141 * Aggregator pad flush lock -> PAD_FLUSH_LOCK(aggpad)
142 * standard src pad stream lock -> GST_PAD_STREAM_LOCK (srcpad)
143 * Aggregator src lock -> SRC_LOCK(agg) w/ SRC_WAIT/BROADCAST
144 * standard element object lock -> GST_OBJECT_LOCK(agg)
145 * Aggregator pad lock -> PAD_LOCK (aggpad) w/ PAD_WAIT/BROADCAST_EVENT(aggpad)
146 * standard src pad object lock -> GST_OBJECT_LOCK(srcpad)
147 * standard sink pad object lock -> GST_OBJECT_LOCK(aggpad)
150 /* GstAggregatorPad definitions */
151 #define PAD_LOCK(pad) G_STMT_START { \
152 GST_TRACE_OBJECT (pad, "Taking PAD lock from thread %p", \
154 g_mutex_lock(&pad->priv->lock); \
155 GST_TRACE_OBJECT (pad, "Took PAD lock from thread %p", \
159 #define PAD_UNLOCK(pad) G_STMT_START { \
160 GST_TRACE_OBJECT (pad, "Releasing PAD lock from thread %p", \
162 g_mutex_unlock(&pad->priv->lock); \
163 GST_TRACE_OBJECT (pad, "Release PAD lock from thread %p", \
168 #define PAD_WAIT_EVENT(pad) G_STMT_START { \
169 GST_LOG_OBJECT (pad, "Waiting for buffer to be consumed thread %p", \
171 g_cond_wait(&(((GstAggregatorPad* )pad)->priv->event_cond), \
172 (&((GstAggregatorPad*)pad)->priv->lock)); \
173 GST_LOG_OBJECT (pad, "DONE Waiting for buffer to be consumed on thread %p", \
177 #define PAD_BROADCAST_EVENT(pad) G_STMT_START { \
178 GST_LOG_OBJECT (pad, "Signaling buffer consumed from thread %p", \
180 g_cond_broadcast(&(((GstAggregatorPad* )pad)->priv->event_cond)); \
184 #define PAD_FLUSH_LOCK(pad) G_STMT_START { \
185 GST_TRACE_OBJECT (pad, "Taking lock from thread %p", \
187 g_mutex_lock(&pad->priv->flush_lock); \
188 GST_TRACE_OBJECT (pad, "Took lock from thread %p", \
192 #define PAD_FLUSH_UNLOCK(pad) G_STMT_START { \
193 GST_TRACE_OBJECT (pad, "Releasing lock from thread %p", \
195 g_mutex_unlock(&pad->priv->flush_lock); \
196 GST_TRACE_OBJECT (pad, "Release lock from thread %p", \
200 #define SRC_LOCK(self) G_STMT_START { \
201 GST_TRACE_OBJECT (self, "Taking src lock from thread %p", \
203 g_mutex_lock(&self->priv->src_lock); \
204 GST_TRACE_OBJECT (self, "Took src lock from thread %p", \
208 #define SRC_UNLOCK(self) G_STMT_START { \
209 GST_TRACE_OBJECT (self, "Releasing src lock from thread %p", \
211 g_mutex_unlock(&self->priv->src_lock); \
212 GST_TRACE_OBJECT (self, "Released src lock from thread %p", \
216 #define SRC_WAIT(self) G_STMT_START { \
217 GST_LOG_OBJECT (self, "Waiting for src on thread %p", \
219 g_cond_wait(&(self->priv->src_cond), &(self->priv->src_lock)); \
220 GST_LOG_OBJECT (self, "DONE Waiting for src on thread %p", \
224 #define SRC_BROADCAST(self) G_STMT_START { \
225 GST_LOG_OBJECT (self, "Signaling src from thread %p", \
227 if (self->priv->aggregate_id) \
228 gst_clock_id_unschedule (self->priv->aggregate_id); \
229 g_cond_broadcast(&(self->priv->src_cond)); \
232 struct _GstAggregatorPadPrivate
234 /* Following fields are protected by the PAD_LOCK */
235 GstFlowReturn flow_return;
236 gboolean pending_flush_start;
237 gboolean pending_flush_stop;
239 gboolean first_buffer;
241 GQueue data; /* buffers, events and queries */
242 GstBuffer *clipped_buffer;
245 /* used to track fill state of queues, only used with live-src and when
246 * latency property is set to > 0 */
247 GstClockTime head_position;
248 GstClockTime tail_position;
249 GstClockTime head_time; /* running time */
250 GstClockTime tail_time;
251 GstClockTime time_level; /* how much head is ahead of tail */
252 GstSegment head_segment; /* segment before the queue */
260 /* This lock prevents a flush start processing happening while
261 * the chain function is also happening.
266 /* Must be called with PAD_LOCK held */
268 gst_aggregator_pad_reset_unlocked (GstAggregatorPad * aggpad)
270 aggpad->priv->eos = FALSE;
271 aggpad->priv->flow_return = GST_FLOW_OK;
272 GST_OBJECT_LOCK (aggpad);
273 gst_segment_init (&aggpad->segment, GST_FORMAT_UNDEFINED);
274 gst_segment_init (&aggpad->priv->head_segment, GST_FORMAT_UNDEFINED);
275 GST_OBJECT_UNLOCK (aggpad);
276 aggpad->priv->head_position = GST_CLOCK_TIME_NONE;
277 aggpad->priv->tail_position = GST_CLOCK_TIME_NONE;
278 aggpad->priv->head_time = GST_CLOCK_TIME_NONE;
279 aggpad->priv->tail_time = GST_CLOCK_TIME_NONE;
280 aggpad->priv->time_level = 0;
281 aggpad->priv->first_buffer = TRUE;
285 gst_aggregator_pad_flush (GstAggregatorPad * aggpad, GstAggregator * agg)
287 GstAggregatorPadClass *klass = GST_AGGREGATOR_PAD_GET_CLASS (aggpad);
290 gst_aggregator_pad_reset_unlocked (aggpad);
294 return klass->flush (aggpad, agg);
299 /*************************************
300 * GstAggregator implementation *
301 *************************************/
302 static GstElementClass *aggregator_parent_class = NULL;
303 static gint aggregator_private_offset = 0;
305 /* All members are protected by the object lock unless otherwise noted */
307 struct _GstAggregatorPrivate
311 /* Our state is >= PAUSED */
312 gboolean running; /* protected by src_lock */
314 /* seqnum from seek or segment,
315 * to be applied to synthetic segment/eos events */
317 gboolean send_stream_start; /* protected by srcpad stream lock */
318 gboolean send_segment;
319 gboolean flush_seeking;
320 gboolean pending_flush_start;
321 gboolean send_eos; /* protected by srcpad stream lock */
323 GstCaps *srccaps; /* protected by the srcpad stream lock */
326 gboolean tags_changed;
328 gboolean peer_latency_live; /* protected by src_lock */
329 GstClockTime peer_latency_min; /* protected by src_lock */
330 GstClockTime peer_latency_max; /* protected by src_lock */
331 gboolean has_peer_latency; /* protected by src_lock */
333 GstClockTime sub_latency_min; /* protected by src_lock */
334 GstClockTime sub_latency_max; /* protected by src_lock */
336 GstClockTime upstream_latency_min; /* protected by src_lock */
339 GstClockID aggregate_id; /* protected by src_lock */
343 gboolean first_buffer; /* protected by object lock */
344 GstAggregatorStartTimeSelection start_time_selection;
345 GstClockTime start_time;
347 /* protected by the object lock */
348 GstQuery *allocation_query;
349 GstAllocator *allocator;
351 GstAllocationParams allocation_params;
354 gint64 latency; /* protected by both src_lock and all pad locks */
357 /* Seek event forwarding helper */
363 gboolean only_to_active_pads;
367 gboolean one_actually_seeked;
370 #define DEFAULT_LATENCY 0
371 #define DEFAULT_MIN_UPSTREAM_LATENCY 0
372 #define DEFAULT_START_TIME_SELECTION GST_AGGREGATOR_START_TIME_SELECTION_ZERO
373 #define DEFAULT_START_TIME (-1)
379 PROP_MIN_UPSTREAM_LATENCY,
380 PROP_START_TIME_SELECTION,
385 static GstFlowReturn gst_aggregator_pad_chain_internal (GstAggregator * self,
386 GstAggregatorPad * aggpad, GstBuffer * buffer, gboolean head);
389 gst_aggregator_pad_queue_is_empty (GstAggregatorPad * pad)
391 return (g_queue_peek_tail (&pad->priv->data) == NULL &&
392 pad->priv->clipped_buffer == NULL);
396 gst_aggregator_check_pads_ready (GstAggregator * self)
398 GstAggregatorPad *pad = NULL;
400 gboolean have_buffer = TRUE;
401 gboolean have_event_or_query = FALSE;
403 GST_LOG_OBJECT (self, "checking pads");
405 GST_OBJECT_LOCK (self);
407 sinkpads = GST_ELEMENT_CAST (self)->sinkpads;
408 if (sinkpads == NULL)
411 for (l = sinkpads; l != NULL; l = l->next) {
416 if (pad->priv->num_buffers == 0) {
417 if (!gst_aggregator_pad_queue_is_empty (pad))
418 have_event_or_query = TRUE;
419 if (!pad->priv->eos) {
422 /* If not live we need data on all pads, so leave the loop */
423 if (!self->priv->peer_latency_live) {
428 } else if (self->priv->peer_latency_live) {
429 /* In live mode, having a single pad with buffers is enough to
430 * generate a start time from it. In non-live mode all pads need
433 self->priv->first_buffer = FALSE;
439 if (!have_buffer && !have_event_or_query)
443 self->priv->first_buffer = FALSE;
445 GST_OBJECT_UNLOCK (self);
446 GST_LOG_OBJECT (self, "pads are ready");
451 GST_LOG_OBJECT (self, "pads not ready: no sink pads");
452 GST_OBJECT_UNLOCK (self);
457 if (have_event_or_query)
458 GST_LOG_OBJECT (pad, "pad not ready to be aggregated yet,"
459 " but waking up for serialized event");
461 GST_LOG_OBJECT (pad, "pad not ready to be aggregated yet");
462 GST_OBJECT_UNLOCK (self);
463 return have_event_or_query;
468 gst_aggregator_reset_flow_values (GstAggregator * self)
470 GST_OBJECT_LOCK (self);
471 self->priv->send_stream_start = TRUE;
472 self->priv->send_segment = TRUE;
473 gst_segment_init (&GST_AGGREGATOR_PAD (self->srcpad)->segment,
475 self->priv->first_buffer = TRUE;
476 GST_OBJECT_UNLOCK (self);
480 gst_aggregator_push_mandatory_events (GstAggregator * self)
482 GstAggregatorPrivate *priv = self->priv;
483 GstEvent *segment = NULL;
484 GstEvent *tags = NULL;
486 if (self->priv->send_stream_start) {
489 GST_INFO_OBJECT (self, "pushing stream start");
490 /* stream-start (FIXME: create id based on input ids) */
491 g_snprintf (s_id, sizeof (s_id), "agg-%08x", g_random_int ());
492 if (!gst_pad_push_event (GST_PAD (self->srcpad),
493 gst_event_new_stream_start (s_id))) {
494 GST_WARNING_OBJECT (self->srcpad, "Sending stream start event failed");
496 self->priv->send_stream_start = FALSE;
499 if (self->priv->srccaps) {
501 GST_INFO_OBJECT (self, "pushing caps: %" GST_PTR_FORMAT,
502 self->priv->srccaps);
503 if (!gst_pad_push_event (GST_PAD (self->srcpad),
504 gst_event_new_caps (self->priv->srccaps))) {
505 GST_WARNING_OBJECT (self->srcpad, "Sending caps event failed");
507 gst_caps_unref (self->priv->srccaps);
508 self->priv->srccaps = NULL;
511 GST_OBJECT_LOCK (self);
512 if (self->priv->send_segment && !self->priv->flush_seeking) {
514 gst_event_new_segment (&GST_AGGREGATOR_PAD (self->srcpad)->segment);
516 if (!self->priv->seqnum)
517 /* This code-path is in preparation to be able to run without a source
518 * connected. Then we won't have a seq-num from a segment event. */
519 self->priv->seqnum = gst_event_get_seqnum (segment);
521 gst_event_set_seqnum (segment, self->priv->seqnum);
522 self->priv->send_segment = FALSE;
524 GST_DEBUG_OBJECT (self, "pushing segment %" GST_PTR_FORMAT, segment);
527 if (priv->tags && priv->tags_changed && !self->priv->flush_seeking) {
528 tags = gst_event_new_tag (gst_tag_list_ref (priv->tags));
529 priv->tags_changed = FALSE;
531 GST_OBJECT_UNLOCK (self);
534 gst_pad_push_event (self->srcpad, segment);
536 gst_pad_push_event (self->srcpad, tags);
541 * gst_aggregator_set_src_caps:
542 * @self: The #GstAggregator
543 * @caps: The #GstCaps to set on the src pad.
545 * Sets the caps to be used on the src pad.
548 gst_aggregator_set_src_caps (GstAggregator * self, GstCaps * caps)
550 GST_PAD_STREAM_LOCK (self->srcpad);
551 gst_caps_replace (&self->priv->srccaps, caps);
552 gst_aggregator_push_mandatory_events (self);
553 GST_PAD_STREAM_UNLOCK (self->srcpad);
557 gst_aggregator_default_finish_buffer (GstAggregator * self, GstBuffer * buffer)
559 gst_aggregator_push_mandatory_events (self);
561 GST_OBJECT_LOCK (self);
562 if (!self->priv->flush_seeking && gst_pad_is_active (self->srcpad)) {
563 GST_TRACE_OBJECT (self, "pushing buffer %" GST_PTR_FORMAT, buffer);
564 GST_OBJECT_UNLOCK (self);
565 return gst_pad_push (self->srcpad, buffer);
567 GST_INFO_OBJECT (self, "Not pushing (active: %i, flushing: %i)",
568 self->priv->flush_seeking, gst_pad_is_active (self->srcpad));
569 GST_OBJECT_UNLOCK (self);
570 gst_buffer_unref (buffer);
576 * gst_aggregator_finish_buffer:
577 * @aggregator: The #GstAggregator
578 * @buffer: (transfer full): the #GstBuffer to push.
580 * This method will push the provided output buffer downstream. If needed,
581 * mandatory events such as stream-start, caps, and segment events will be
582 * sent before pushing the buffer.
585 gst_aggregator_finish_buffer (GstAggregator * aggregator, GstBuffer * buffer)
587 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (aggregator);
589 g_assert (klass->finish_buffer != NULL);
591 return klass->finish_buffer (aggregator, buffer);
595 gst_aggregator_push_eos (GstAggregator * self)
598 gst_aggregator_push_mandatory_events (self);
600 event = gst_event_new_eos ();
602 GST_OBJECT_LOCK (self);
603 self->priv->send_eos = FALSE;
604 gst_event_set_seqnum (event, self->priv->seqnum);
605 GST_OBJECT_UNLOCK (self);
607 gst_pad_push_event (self->srcpad, event);
611 gst_aggregator_get_next_time (GstAggregator * self)
613 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (self);
615 if (klass->get_next_time)
616 return klass->get_next_time (self);
618 return GST_CLOCK_TIME_NONE;
622 gst_aggregator_wait_and_check (GstAggregator * self, gboolean * timeout)
624 GstClockTime latency;
632 latency = gst_aggregator_get_latency_unlocked (self);
634 if (gst_aggregator_check_pads_ready (self)) {
635 GST_DEBUG_OBJECT (self, "all pads have data");
641 /* Before waiting, check if we're actually still running */
642 if (!self->priv->running || !self->priv->send_eos) {
648 start = gst_aggregator_get_next_time (self);
650 /* If we're not live, or if we use the running time
651 * of the first buffer as start time, we wait until
652 * all pads have buffers.
653 * Otherwise (i.e. if we are live!), we wait on the clock
654 * and if a pad does not have a buffer in time we ignore
657 GST_OBJECT_LOCK (self);
658 if (!GST_CLOCK_TIME_IS_VALID (latency) ||
659 !GST_IS_CLOCK (GST_ELEMENT_CLOCK (self)) ||
660 !GST_CLOCK_TIME_IS_VALID (start) ||
661 (self->priv->first_buffer
662 && self->priv->start_time_selection ==
663 GST_AGGREGATOR_START_TIME_SELECTION_FIRST)) {
664 /* We wake up here when something happened, and below
665 * then check if we're ready now. If we return FALSE,
666 * we will be directly called again.
668 GST_OBJECT_UNLOCK (self);
671 GstClockTime base_time, time;
673 GstClockReturn status;
674 GstClockTimeDiff jitter;
676 GST_DEBUG_OBJECT (self, "got subclass start time: %" GST_TIME_FORMAT,
677 GST_TIME_ARGS (start));
679 base_time = GST_ELEMENT_CAST (self)->base_time;
680 clock = gst_object_ref (GST_ELEMENT_CLOCK (self));
681 GST_OBJECT_UNLOCK (self);
683 time = base_time + start;
686 GST_DEBUG_OBJECT (self, "possibly waiting for clock to reach %"
687 GST_TIME_FORMAT " (base %" GST_TIME_FORMAT " start %" GST_TIME_FORMAT
688 " latency %" GST_TIME_FORMAT " current %" GST_TIME_FORMAT ")",
689 GST_TIME_ARGS (time),
690 GST_TIME_ARGS (base_time),
691 GST_TIME_ARGS (start), GST_TIME_ARGS (latency),
692 GST_TIME_ARGS (gst_clock_get_time (clock)));
694 self->priv->aggregate_id = gst_clock_new_single_shot_id (clock, time);
695 gst_object_unref (clock);
699 status = gst_clock_id_wait (self->priv->aggregate_id, &jitter);
702 if (self->priv->aggregate_id) {
703 gst_clock_id_unref (self->priv->aggregate_id);
704 self->priv->aggregate_id = NULL;
707 GST_DEBUG_OBJECT (self,
708 "clock returned %d (jitter: %" GST_STIME_FORMAT ")",
709 status, GST_STIME_ARGS (jitter));
712 if (status == GST_CLOCK_OK || status == GST_CLOCK_EARLY) {
719 res = gst_aggregator_check_pads_ready (self);
727 gboolean processed_event;
728 GstFlowReturn flow_ret;
729 } DoHandleEventsAndQueriesData;
732 gst_aggregator_do_events_and_queries (GstElement * self, GstPad * epad,
735 GstAggregatorPad *pad = GST_AGGREGATOR_PAD_CAST (epad);
736 GstAggregator *aggregator = GST_AGGREGATOR_CAST (self);
737 GstEvent *event = NULL;
738 GstQuery *query = NULL;
739 GstAggregatorClass *klass = NULL;
740 DoHandleEventsAndQueriesData *data = user_data;
747 if (pad->priv->clipped_buffer == NULL &&
748 !GST_IS_BUFFER (g_queue_peek_tail (&pad->priv->data))) {
749 if (GST_IS_EVENT (g_queue_peek_tail (&pad->priv->data)))
750 event = gst_event_ref (g_queue_peek_tail (&pad->priv->data));
751 if (GST_IS_QUERY (g_queue_peek_tail (&pad->priv->data)))
752 query = g_queue_peek_tail (&pad->priv->data);
755 if (event || query) {
758 data->processed_event = TRUE;
760 klass = GST_AGGREGATOR_GET_CLASS (self);
763 GST_LOG_OBJECT (pad, "Processing %" GST_PTR_FORMAT, event);
764 gst_event_ref (event);
765 ret = klass->sink_event (aggregator, pad, event);
768 if (GST_EVENT_TYPE (event) == GST_EVENT_CAPS) {
769 pad->priv->negotiated = ret;
771 pad->priv->flow_return = data->flow_ret = GST_FLOW_NOT_NEGOTIATED;
773 if (g_queue_peek_tail (&pad->priv->data) == event)
774 gst_event_unref (g_queue_pop_tail (&pad->priv->data));
775 gst_event_unref (event);
777 GST_LOG_OBJECT (pad, "Processing %" GST_PTR_FORMAT, query);
778 ret = klass->sink_query (aggregator, pad, query);
781 if (g_queue_peek_tail (&pad->priv->data) == query) {
784 s = gst_query_writable_structure (query);
785 gst_structure_set (s, "gst-aggregator-retval", G_TYPE_BOOLEAN, ret,
787 g_queue_pop_tail (&pad->priv->data);
791 PAD_BROADCAST_EVENT (pad);
794 } while (event || query);
800 gst_aggregator_pad_skip_buffers (GstElement * self, GstPad * epad,
804 GstAggregatorPad *aggpad = (GstAggregatorPad *) epad;
805 GstAggregator *agg = (GstAggregator *) self;
806 GstAggregatorPadClass *klass = GST_AGGREGATOR_PAD_GET_CLASS (aggpad);
808 if (!klass->skip_buffer)
813 item = g_queue_peek_head_link (&aggpad->priv->data);
815 GList *next = item->next;
817 if (GST_IS_BUFFER (item->data)
818 && klass->skip_buffer (aggpad, agg, item->data)) {
819 GST_LOG_OBJECT (aggpad, "Skipping %" GST_PTR_FORMAT, item->data);
820 gst_aggregator_pad_buffer_consumed (aggpad);
821 gst_buffer_unref (item->data);
822 g_queue_delete_link (&aggpad->priv->data, item);
836 gst_aggregator_pad_set_flushing (GstAggregatorPad * aggpad,
837 GstFlowReturn flow_return, gboolean full)
842 if (flow_return == GST_FLOW_NOT_LINKED)
843 aggpad->priv->flow_return = MIN (flow_return, aggpad->priv->flow_return);
845 aggpad->priv->flow_return = flow_return;
847 item = g_queue_peek_head_link (&aggpad->priv->data);
849 GList *next = item->next;
851 /* In partial flush, we do like the pad, we get rid of non-sticky events
854 if (full || GST_IS_BUFFER (item->data) ||
855 GST_EVENT_TYPE (item->data) == GST_EVENT_EOS ||
856 GST_EVENT_TYPE (item->data) == GST_EVENT_SEGMENT ||
857 !GST_EVENT_IS_STICKY (item->data)) {
858 if (!GST_IS_QUERY (item->data))
859 gst_mini_object_unref (item->data);
860 g_queue_delete_link (&aggpad->priv->data, item);
864 aggpad->priv->num_buffers = 0;
865 gst_buffer_replace (&aggpad->priv->clipped_buffer, NULL);
867 PAD_BROADCAST_EVENT (aggpad);
872 gst_aggregator_default_update_src_caps (GstAggregator * agg, GstCaps * caps,
875 *ret = gst_caps_ref (caps);
881 gst_aggregator_default_fixate_src_caps (GstAggregator * agg, GstCaps * caps)
883 caps = gst_caps_fixate (caps);
889 gst_aggregator_default_negotiated_src_caps (GstAggregator * agg, GstCaps * caps)
895 /* takes ownership of the pool, allocator and query */
897 gst_aggregator_set_allocation (GstAggregator * self,
898 GstBufferPool * pool, GstAllocator * allocator,
899 GstAllocationParams * params, GstQuery * query)
901 GstAllocator *oldalloc;
902 GstBufferPool *oldpool;
905 GST_DEBUG ("storing allocation query");
907 GST_OBJECT_LOCK (self);
908 oldpool = self->priv->pool;
909 self->priv->pool = pool;
911 oldalloc = self->priv->allocator;
912 self->priv->allocator = allocator;
914 oldquery = self->priv->allocation_query;
915 self->priv->allocation_query = query;
918 self->priv->allocation_params = *params;
920 gst_allocation_params_init (&self->priv->allocation_params);
921 GST_OBJECT_UNLOCK (self);
924 GST_DEBUG_OBJECT (self, "deactivating old pool %p", oldpool);
925 gst_buffer_pool_set_active (oldpool, FALSE);
926 gst_object_unref (oldpool);
929 gst_object_unref (oldalloc);
932 gst_query_unref (oldquery);
939 gst_aggregator_decide_allocation (GstAggregator * self, GstQuery * query)
941 GstAggregatorClass *aggclass = GST_AGGREGATOR_GET_CLASS (self);
943 if (aggclass->decide_allocation)
944 if (!aggclass->decide_allocation (self, query))
951 gst_aggregator_do_allocation (GstAggregator * self, GstCaps * caps)
954 gboolean result = TRUE;
955 GstBufferPool *pool = NULL;
956 GstAllocator *allocator;
957 GstAllocationParams params;
959 /* find a pool for the negotiated caps now */
960 GST_DEBUG_OBJECT (self, "doing allocation query");
961 query = gst_query_new_allocation (caps, TRUE);
962 if (!gst_pad_peer_query (self->srcpad, query)) {
963 /* not a problem, just debug a little */
964 GST_DEBUG_OBJECT (self, "peer ALLOCATION query failed");
967 GST_DEBUG_OBJECT (self, "calling decide_allocation");
968 result = gst_aggregator_decide_allocation (self, query);
970 GST_DEBUG_OBJECT (self, "ALLOCATION (%d) params: %" GST_PTR_FORMAT, result,
974 goto no_decide_allocation;
976 /* we got configuration from our peer or the decide_allocation method,
978 if (gst_query_get_n_allocation_params (query) > 0) {
979 gst_query_parse_nth_allocation_param (query, 0, &allocator, ¶ms);
982 gst_allocation_params_init (¶ms);
985 if (gst_query_get_n_allocation_pools (query) > 0)
986 gst_query_parse_nth_allocation_pool (query, 0, &pool, NULL, NULL, NULL);
990 gst_aggregator_set_allocation (self, pool, allocator, ¶ms, query);
995 no_decide_allocation:
997 GST_WARNING_OBJECT (self, "Failed to decide allocation");
998 gst_query_unref (query);
1005 /* WITH SRC_LOCK held */
1006 static GstFlowReturn
1007 gst_aggregator_update_src_caps (GstAggregator * self)
1009 GstAggregatorClass *agg_klass = GST_AGGREGATOR_GET_CLASS (self);
1010 GstCaps *downstream_caps, *template_caps, *caps = NULL;
1011 GstFlowReturn ret = GST_FLOW_OK;
1013 template_caps = gst_pad_get_pad_template_caps (self->srcpad);
1014 downstream_caps = gst_pad_peer_query_caps (self->srcpad, template_caps);
1016 if (gst_caps_is_empty (downstream_caps)) {
1017 GST_INFO_OBJECT (self, "Downstream caps (%"
1018 GST_PTR_FORMAT ") not compatible with pad template caps (%"
1019 GST_PTR_FORMAT ")", downstream_caps, template_caps);
1020 ret = GST_FLOW_NOT_NEGOTIATED;
1024 g_assert (agg_klass->update_src_caps);
1025 GST_DEBUG_OBJECT (self, "updating caps from %" GST_PTR_FORMAT,
1027 ret = agg_klass->update_src_caps (self, downstream_caps, &caps);
1028 if (ret < GST_FLOW_OK) {
1029 GST_WARNING_OBJECT (self, "Subclass failed to update provided caps");
1032 if ((caps == NULL || gst_caps_is_empty (caps)) && ret >= GST_FLOW_OK) {
1033 ret = GST_FLOW_NOT_NEGOTIATED;
1036 GST_DEBUG_OBJECT (self, " to %" GST_PTR_FORMAT, caps);
1038 #ifdef GST_ENABLE_EXTRA_CHECKS
1039 if (!gst_caps_is_subset (caps, template_caps)) {
1040 GstCaps *intersection;
1042 GST_ERROR_OBJECT (self,
1043 "update_src_caps returned caps %" GST_PTR_FORMAT
1044 " which are not a real subset of the template caps %"
1045 GST_PTR_FORMAT, caps, template_caps);
1046 g_warning ("%s: update_src_caps returned caps which are not a real "
1047 "subset of the filter caps", GST_ELEMENT_NAME (self));
1050 gst_caps_intersect_full (template_caps, caps, GST_CAPS_INTERSECT_FIRST);
1051 gst_caps_unref (caps);
1052 caps = intersection;
1056 if (gst_caps_is_any (caps)) {
1060 if (!gst_caps_is_fixed (caps)) {
1061 g_assert (agg_klass->fixate_src_caps);
1063 GST_DEBUG_OBJECT (self, "fixate caps from %" GST_PTR_FORMAT, caps);
1064 if (!(caps = agg_klass->fixate_src_caps (self, caps))) {
1065 GST_WARNING_OBJECT (self, "Subclass failed to fixate provided caps");
1066 ret = GST_FLOW_NOT_NEGOTIATED;
1069 GST_DEBUG_OBJECT (self, " to %" GST_PTR_FORMAT, caps);
1072 if (agg_klass->negotiated_src_caps) {
1073 if (!agg_klass->negotiated_src_caps (self, caps)) {
1074 GST_WARNING_OBJECT (self, "Subclass failed to accept negotiated caps");
1075 ret = GST_FLOW_NOT_NEGOTIATED;
1080 gst_aggregator_set_src_caps (self, caps);
1082 if (!gst_aggregator_do_allocation (self, caps)) {
1083 GST_WARNING_OBJECT (self, "Allocation negotiation failed");
1084 ret = GST_FLOW_NOT_NEGOTIATED;
1088 gst_caps_unref (downstream_caps);
1089 gst_caps_unref (template_caps);
1092 gst_caps_unref (caps);
1098 gst_aggregator_aggregate_func (GstAggregator * self)
1100 GstAggregatorPrivate *priv = self->priv;
1101 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (self);
1102 gboolean timeout = FALSE;
1104 if (self->priv->running == FALSE) {
1105 GST_DEBUG_OBJECT (self, "Not running anymore");
1109 GST_LOG_OBJECT (self, "Checking aggregate");
1110 while (priv->send_eos && priv->running) {
1111 GstFlowReturn flow_return = GST_FLOW_OK;
1112 DoHandleEventsAndQueriesData events_query_data = { FALSE, GST_FLOW_OK };
1114 gst_element_foreach_sink_pad (GST_ELEMENT_CAST (self),
1115 gst_aggregator_do_events_and_queries, &events_query_data);
1117 if ((flow_return = events_query_data.flow_ret) != GST_FLOW_OK)
1120 if (self->priv->peer_latency_live)
1121 gst_element_foreach_sink_pad (GST_ELEMENT_CAST (self),
1122 gst_aggregator_pad_skip_buffers, NULL);
1124 /* Ensure we have buffers ready (either in clipped_buffer or at the head of
1126 if (!gst_aggregator_wait_and_check (self, &timeout))
1129 events_query_data.processed_event = FALSE;
1130 events_query_data.flow_ret = GST_FLOW_OK;
1131 gst_element_foreach_sink_pad (GST_ELEMENT_CAST (self),
1132 gst_aggregator_do_events_and_queries, &events_query_data);
1134 if ((flow_return = events_query_data.flow_ret) != GST_FLOW_OK)
1137 if (events_query_data.processed_event)
1140 if (gst_pad_check_reconfigure (GST_AGGREGATOR_SRC_PAD (self))) {
1141 flow_return = gst_aggregator_update_src_caps (self);
1142 if (flow_return != GST_FLOW_OK)
1143 gst_pad_mark_reconfigure (GST_AGGREGATOR_SRC_PAD (self));
1146 if (timeout || flow_return >= GST_FLOW_OK) {
1147 GST_TRACE_OBJECT (self, "Actually aggregating!");
1148 flow_return = klass->aggregate (self, timeout);
1151 if (flow_return == GST_AGGREGATOR_FLOW_NEED_DATA)
1154 GST_OBJECT_LOCK (self);
1155 if (flow_return == GST_FLOW_FLUSHING && priv->flush_seeking) {
1156 /* We don't want to set the pads to flushing, but we want to
1157 * stop the thread, so just break here */
1158 GST_OBJECT_UNLOCK (self);
1161 GST_OBJECT_UNLOCK (self);
1163 if (flow_return == GST_FLOW_EOS || flow_return == GST_FLOW_ERROR) {
1164 gst_aggregator_push_eos (self);
1168 GST_LOG_OBJECT (self, "flow return is %s", gst_flow_get_name (flow_return));
1170 if (flow_return != GST_FLOW_OK) {
1173 GST_OBJECT_LOCK (self);
1174 for (item = GST_ELEMENT (self)->sinkpads; item; item = item->next) {
1175 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (item->data);
1177 gst_aggregator_pad_set_flushing (aggpad, flow_return, TRUE);
1179 GST_OBJECT_UNLOCK (self);
1184 /* Pause the task here, the only ways to get here are:
1185 * 1) We're stopping, in which case the task is stopped anyway
1186 * 2) We got a flow error above, in which case it might take
1187 * some time to forward the flow return upstream and we
1188 * would otherwise call the task function over and over
1189 * again without doing anything
1191 gst_pad_pause_task (self->srcpad);
1195 gst_aggregator_start (GstAggregator * self)
1197 GstAggregatorClass *klass;
1200 self->priv->send_stream_start = TRUE;
1201 self->priv->send_segment = TRUE;
1202 self->priv->send_eos = TRUE;
1203 self->priv->srccaps = NULL;
1205 gst_aggregator_set_allocation (self, NULL, NULL, NULL, NULL);
1207 klass = GST_AGGREGATOR_GET_CLASS (self);
1210 result = klass->start (self);
1218 _check_pending_flush_stop (GstAggregatorPad * pad)
1223 res = (!pad->priv->pending_flush_stop && !pad->priv->pending_flush_start);
1230 gst_aggregator_stop_srcpad_task (GstAggregator * self, GstEvent * flush_start)
1232 gboolean res = TRUE;
1234 GST_INFO_OBJECT (self, "%s srcpad task",
1235 flush_start ? "Pausing" : "Stopping");
1238 self->priv->running = FALSE;
1239 SRC_BROADCAST (self);
1243 res = gst_pad_push_event (self->srcpad, flush_start);
1246 gst_pad_stop_task (self->srcpad);
1252 gst_aggregator_start_srcpad_task (GstAggregator * self)
1254 GST_INFO_OBJECT (self, "Starting srcpad task");
1256 self->priv->running = TRUE;
1257 gst_pad_start_task (GST_PAD (self->srcpad),
1258 (GstTaskFunction) gst_aggregator_aggregate_func, self, NULL);
1261 static GstFlowReturn
1262 gst_aggregator_flush (GstAggregator * self)
1264 GstFlowReturn ret = GST_FLOW_OK;
1265 GstAggregatorPrivate *priv = self->priv;
1266 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (self);
1268 GST_DEBUG_OBJECT (self, "Flushing everything");
1269 GST_OBJECT_LOCK (self);
1270 priv->send_segment = TRUE;
1271 priv->flush_seeking = FALSE;
1272 priv->tags_changed = FALSE;
1273 GST_OBJECT_UNLOCK (self);
1275 ret = klass->flush (self);
1281 /* Called with GstAggregator's object lock held */
1284 gst_aggregator_all_flush_stop_received_locked (GstAggregator * self)
1287 GstAggregatorPad *tmppad;
1289 for (tmp = GST_ELEMENT (self)->sinkpads; tmp; tmp = tmp->next) {
1290 tmppad = (GstAggregatorPad *) tmp->data;
1292 if (_check_pending_flush_stop (tmppad) == FALSE) {
1293 GST_DEBUG_OBJECT (tmppad, "Is not last %i -- %i",
1294 tmppad->priv->pending_flush_start, tmppad->priv->pending_flush_stop);
1303 gst_aggregator_flush_start (GstAggregator * self, GstAggregatorPad * aggpad,
1306 GstAggregatorPrivate *priv = self->priv;
1307 GstAggregatorPadPrivate *padpriv = aggpad->priv;
1309 gst_aggregator_pad_set_flushing (aggpad, GST_FLOW_FLUSHING, FALSE);
1311 PAD_FLUSH_LOCK (aggpad);
1313 if (padpriv->pending_flush_start) {
1314 GST_DEBUG_OBJECT (aggpad, "Expecting FLUSH_STOP now");
1316 padpriv->pending_flush_start = FALSE;
1317 padpriv->pending_flush_stop = TRUE;
1319 PAD_UNLOCK (aggpad);
1321 GST_OBJECT_LOCK (self);
1322 if (priv->flush_seeking) {
1323 /* If flush_seeking we forward the first FLUSH_START */
1324 if (priv->pending_flush_start) {
1325 priv->pending_flush_start = FALSE;
1326 GST_OBJECT_UNLOCK (self);
1328 GST_INFO_OBJECT (self, "Flushing, pausing srcpad task");
1329 gst_aggregator_stop_srcpad_task (self, event);
1331 GST_INFO_OBJECT (self, "Getting STREAM_LOCK while seeking");
1332 GST_PAD_STREAM_LOCK (self->srcpad);
1333 GST_LOG_OBJECT (self, "GOT STREAM_LOCK");
1336 GST_OBJECT_UNLOCK (self);
1337 gst_event_unref (event);
1340 GST_OBJECT_UNLOCK (self);
1341 gst_event_unref (event);
1343 PAD_FLUSH_UNLOCK (aggpad);
1346 /* Must be called with the the PAD_LOCK held */
1348 update_time_level (GstAggregatorPad * aggpad, gboolean head)
1350 GstAggregatorPadPrivate *priv = aggpad->priv;
1353 if (GST_CLOCK_TIME_IS_VALID (priv->head_position) &&
1354 priv->head_segment.format == GST_FORMAT_TIME)
1355 priv->head_time = gst_segment_to_running_time (&priv->head_segment,
1356 GST_FORMAT_TIME, priv->head_position);
1358 priv->head_time = GST_CLOCK_TIME_NONE;
1360 if (!GST_CLOCK_TIME_IS_VALID (priv->tail_time))
1361 priv->tail_time = priv->head_time;
1363 if (GST_CLOCK_TIME_IS_VALID (priv->tail_position) &&
1364 aggpad->segment.format == GST_FORMAT_TIME)
1365 priv->tail_time = gst_segment_to_running_time (&aggpad->segment,
1366 GST_FORMAT_TIME, priv->tail_position);
1368 priv->tail_time = priv->head_time;
1371 if (priv->head_time == GST_CLOCK_TIME_NONE ||
1372 priv->tail_time == GST_CLOCK_TIME_NONE) {
1373 priv->time_level = 0;
1377 if (priv->tail_time > priv->head_time)
1378 priv->time_level = 0;
1380 priv->time_level = priv->head_time - priv->tail_time;
1384 /* GstAggregator vmethods default implementations */
1386 gst_aggregator_default_sink_event (GstAggregator * self,
1387 GstAggregatorPad * aggpad, GstEvent * event)
1389 gboolean res = TRUE;
1390 GstPad *pad = GST_PAD (aggpad);
1391 GstAggregatorPrivate *priv = self->priv;
1393 GST_DEBUG_OBJECT (aggpad, "Got event: %" GST_PTR_FORMAT, event);
1395 switch (GST_EVENT_TYPE (event)) {
1396 case GST_EVENT_FLUSH_START:
1398 gst_aggregator_flush_start (self, aggpad, event);
1399 /* We forward only in one case: right after flush_seeking */
1403 case GST_EVENT_FLUSH_STOP:
1405 gst_aggregator_pad_flush (aggpad, self);
1406 GST_OBJECT_LOCK (self);
1407 if (priv->flush_seeking) {
1408 g_atomic_int_set (&aggpad->priv->pending_flush_stop, FALSE);
1409 if (gst_aggregator_all_flush_stop_received_locked (self)) {
1410 GST_OBJECT_UNLOCK (self);
1411 /* That means we received FLUSH_STOP/FLUSH_STOP on
1412 * all sinkpads -- Seeking is Done... sending FLUSH_STOP */
1413 gst_aggregator_flush (self);
1414 gst_pad_push_event (self->srcpad, event);
1417 priv->send_eos = TRUE;
1418 SRC_BROADCAST (self);
1421 GST_INFO_OBJECT (self, "Releasing source pad STREAM_LOCK");
1422 GST_PAD_STREAM_UNLOCK (self->srcpad);
1423 gst_aggregator_start_srcpad_task (self);
1425 GST_OBJECT_UNLOCK (self);
1428 GST_OBJECT_UNLOCK (self);
1431 /* We never forward the event */
1438 g_assert (aggpad->priv->num_buffers == 0);
1439 aggpad->priv->eos = TRUE;
1440 PAD_UNLOCK (aggpad);
1441 SRC_BROADCAST (self);
1445 case GST_EVENT_SEGMENT:
1448 GST_OBJECT_LOCK (aggpad);
1449 gst_event_copy_segment (event, &aggpad->segment);
1450 /* We've got a new segment, tail_position is now meaningless
1451 * and may interfere with the time_level calculation
1453 aggpad->priv->tail_position = GST_CLOCK_TIME_NONE;
1454 update_time_level (aggpad, FALSE);
1455 GST_OBJECT_UNLOCK (aggpad);
1456 PAD_UNLOCK (aggpad);
1458 GST_OBJECT_LOCK (self);
1459 self->priv->seqnum = gst_event_get_seqnum (event);
1460 GST_OBJECT_UNLOCK (self);
1463 case GST_EVENT_STREAM_START:
1469 GstClockTime pts, endpts;
1470 GstClockTime duration;
1473 gst_event_parse_gap (event, &pts, &duration);
1475 if (GST_CLOCK_TIME_IS_VALID (duration))
1476 endpts = pts + duration;
1478 endpts = GST_CLOCK_TIME_NONE;
1480 GST_OBJECT_LOCK (aggpad);
1481 res = gst_segment_clip (&aggpad->segment, GST_FORMAT_TIME, pts, endpts,
1483 GST_OBJECT_UNLOCK (aggpad);
1486 GST_WARNING_OBJECT (self, "GAP event outside segment, dropping");
1490 if (GST_CLOCK_TIME_IS_VALID (endpts) && GST_CLOCK_TIME_IS_VALID (pts))
1491 duration = endpts - pts;
1493 duration = GST_CLOCK_TIME_NONE;
1495 gapbuf = gst_buffer_new ();
1496 GST_BUFFER_PTS (gapbuf) = pts;
1497 GST_BUFFER_DURATION (gapbuf) = duration;
1498 GST_BUFFER_FLAG_SET (gapbuf, GST_BUFFER_FLAG_GAP);
1499 GST_BUFFER_FLAG_SET (gapbuf, GST_BUFFER_FLAG_DROPPABLE);
1501 /* Remove GAP event so we can replace it with the buffer */
1503 if (g_queue_peek_tail (&aggpad->priv->data) == event)
1504 gst_event_unref (g_queue_pop_tail (&aggpad->priv->data));
1505 PAD_UNLOCK (aggpad);
1507 if (gst_aggregator_pad_chain_internal (self, aggpad, gapbuf, FALSE) !=
1509 GST_WARNING_OBJECT (self, "Failed to chain gap buffer");
1523 GST_DEBUG_OBJECT (pad, "Forwarding event: %" GST_PTR_FORMAT, event);
1524 return gst_pad_event_default (pad, GST_OBJECT (self), event);
1527 GST_DEBUG_OBJECT (pad, "Eating event: %" GST_PTR_FORMAT, event);
1529 gst_event_unref (event);
1535 gst_aggregator_stop_pad (GstElement * self, GstPad * epad, gpointer user_data)
1537 GstAggregatorPad *pad = GST_AGGREGATOR_PAD_CAST (epad);
1538 GstAggregator *agg = GST_AGGREGATOR_CAST (self);
1540 gst_aggregator_pad_flush (pad, agg);
1543 pad->priv->flow_return = GST_FLOW_FLUSHING;
1544 pad->priv->negotiated = FALSE;
1545 PAD_BROADCAST_EVENT (pad);
1552 gst_aggregator_stop (GstAggregator * agg)
1554 GstAggregatorClass *klass;
1557 gst_aggregator_reset_flow_values (agg);
1559 /* Application needs to make sure no pads are added while it shuts us down */
1560 gst_element_foreach_sink_pad (GST_ELEMENT_CAST (agg),
1561 gst_aggregator_stop_pad, NULL);
1563 klass = GST_AGGREGATOR_GET_CLASS (agg);
1566 result = klass->stop (agg);
1570 agg->priv->has_peer_latency = FALSE;
1571 agg->priv->peer_latency_live = FALSE;
1572 agg->priv->peer_latency_min = agg->priv->peer_latency_max = 0;
1574 if (agg->priv->tags)
1575 gst_tag_list_unref (agg->priv->tags);
1576 agg->priv->tags = NULL;
1578 gst_aggregator_set_allocation (agg, NULL, NULL, NULL, NULL);
1583 /* GstElement vmethods implementations */
1584 static GstStateChangeReturn
1585 gst_aggregator_change_state (GstElement * element, GstStateChange transition)
1587 GstStateChangeReturn ret;
1588 GstAggregator *self = GST_AGGREGATOR (element);
1590 switch (transition) {
1591 case GST_STATE_CHANGE_READY_TO_PAUSED:
1592 if (!gst_aggregator_start (self))
1600 GST_ELEMENT_CLASS (aggregator_parent_class)->change_state (element,
1601 transition)) == GST_STATE_CHANGE_FAILURE)
1605 switch (transition) {
1606 case GST_STATE_CHANGE_PAUSED_TO_READY:
1607 if (!gst_aggregator_stop (self)) {
1608 /* What to do in this case? Error out? */
1609 GST_ERROR_OBJECT (self, "Subclass failed to stop.");
1621 GST_ERROR_OBJECT (element, "parent failed state change");
1626 GST_ERROR_OBJECT (element, "Subclass failed to start");
1627 return GST_STATE_CHANGE_FAILURE;
1632 gst_aggregator_release_pad (GstElement * element, GstPad * pad)
1634 GstAggregator *self = GST_AGGREGATOR (element);
1635 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
1637 GST_INFO_OBJECT (pad, "Removing pad");
1640 gst_aggregator_pad_set_flushing (aggpad, GST_FLOW_FLUSHING, TRUE);
1641 gst_element_remove_pad (element, pad);
1643 self->priv->has_peer_latency = FALSE;
1644 SRC_BROADCAST (self);
1648 static GstAggregatorPad *
1649 gst_aggregator_default_create_new_pad (GstAggregator * self,
1650 GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps)
1652 GstAggregatorPad *agg_pad;
1653 GstAggregatorPrivate *priv = self->priv;
1657 GST_PAD_TEMPLATE_GTYPE (templ) ==
1658 G_TYPE_NONE ? GST_TYPE_AGGREGATOR_PAD : GST_PAD_TEMPLATE_GTYPE (templ);
1660 if (templ->direction != GST_PAD_SINK)
1663 if (templ->presence != GST_PAD_REQUEST)
1666 GST_OBJECT_LOCK (self);
1667 if (req_name == NULL || strlen (req_name) < 6
1668 || !g_str_has_prefix (req_name, "sink_")) {
1669 /* no name given when requesting the pad, use next available int */
1670 serial = ++priv->max_padserial;
1672 /* parse serial number from requested padname */
1673 serial = g_ascii_strtoull (&req_name[5], NULL, 10);
1674 if (serial > priv->max_padserial)
1675 priv->max_padserial = serial;
1678 name = g_strdup_printf ("sink_%u", serial);
1679 agg_pad = g_object_new (pad_type,
1680 "name", name, "direction", GST_PAD_SINK, "template", templ, NULL);
1683 GST_OBJECT_UNLOCK (self);
1690 GST_WARNING_OBJECT (self, "request new pad that is not a SINK pad");
1695 GST_WARNING_OBJECT (self, "request new pad that is not a REQUEST pad");
1701 gst_aggregator_request_new_pad (GstElement * element,
1702 GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps)
1704 GstAggregator *self;
1705 GstAggregatorPad *agg_pad;
1706 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (element);
1707 GstAggregatorPrivate *priv = GST_AGGREGATOR (element)->priv;
1709 self = GST_AGGREGATOR (element);
1711 agg_pad = klass->create_new_pad (self, templ, req_name, caps);
1713 GST_ERROR_OBJECT (element, "Couldn't create new pad");
1717 GST_DEBUG_OBJECT (element, "Adding pad %s", GST_PAD_NAME (agg_pad));
1720 gst_pad_set_active (GST_PAD (agg_pad), TRUE);
1722 /* add the pad to the element */
1723 gst_element_add_pad (element, GST_PAD (agg_pad));
1725 return GST_PAD (agg_pad);
1728 /* Must be called with SRC_LOCK held */
1731 gst_aggregator_query_latency_unlocked (GstAggregator * self, GstQuery * query)
1733 gboolean query_ret, live;
1734 GstClockTime our_latency, min, max;
1736 query_ret = gst_pad_query_default (self->srcpad, GST_OBJECT (self), query);
1739 GST_WARNING_OBJECT (self, "Latency query failed");
1743 gst_query_parse_latency (query, &live, &min, &max);
1745 if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (min))) {
1746 GST_ERROR_OBJECT (self, "Invalid minimum latency %" GST_TIME_FORMAT
1747 ". Please file a bug at " PACKAGE_BUGREPORT ".", GST_TIME_ARGS (min));
1751 if (self->priv->upstream_latency_min > min) {
1752 GstClockTimeDiff diff =
1753 GST_CLOCK_DIFF (min, self->priv->upstream_latency_min);
1756 if (GST_CLOCK_TIME_IS_VALID (max)) {
1761 if (min > max && GST_CLOCK_TIME_IS_VALID (max)) {
1762 GST_ELEMENT_WARNING (self, CORE, CLOCK, (NULL),
1763 ("Impossible to configure latency: max %" GST_TIME_FORMAT " < min %"
1764 GST_TIME_FORMAT ". Add queues or other buffering elements.",
1765 GST_TIME_ARGS (max), GST_TIME_ARGS (min)));
1769 our_latency = self->priv->latency;
1771 self->priv->peer_latency_live = live;
1772 self->priv->peer_latency_min = min;
1773 self->priv->peer_latency_max = max;
1774 self->priv->has_peer_latency = TRUE;
1778 min += self->priv->sub_latency_min;
1779 if (GST_CLOCK_TIME_IS_VALID (self->priv->sub_latency_max)
1780 && GST_CLOCK_TIME_IS_VALID (max))
1781 max += self->priv->sub_latency_max + our_latency;
1783 max = GST_CLOCK_TIME_NONE;
1785 SRC_BROADCAST (self);
1787 GST_DEBUG_OBJECT (self, "configured latency live:%s min:%" G_GINT64_FORMAT
1788 " max:%" G_GINT64_FORMAT, live ? "true" : "false", min, max);
1790 gst_query_set_latency (query, live, min, max);
1796 * MUST be called with the src_lock held.
1798 * See gst_aggregator_get_latency() for doc
1801 gst_aggregator_get_latency_unlocked (GstAggregator * self)
1803 GstClockTime latency;
1805 g_return_val_if_fail (GST_IS_AGGREGATOR (self), 0);
1807 if (!self->priv->has_peer_latency) {
1808 GstQuery *query = gst_query_new_latency ();
1811 ret = gst_aggregator_query_latency_unlocked (self, query);
1812 gst_query_unref (query);
1814 return GST_CLOCK_TIME_NONE;
1817 if (!self->priv->has_peer_latency || !self->priv->peer_latency_live)
1818 return GST_CLOCK_TIME_NONE;
1820 /* latency_min is never GST_CLOCK_TIME_NONE by construction */
1821 latency = self->priv->peer_latency_min;
1824 latency += self->priv->latency;
1825 latency += self->priv->sub_latency_min;
1831 * gst_aggregator_get_latency:
1832 * @self: a #GstAggregator
1834 * Retrieves the latency values reported by @self in response to the latency
1835 * query, or %GST_CLOCK_TIME_NONE if there is not live source connected and the element
1836 * will not wait for the clock.
1838 * Typically only called by subclasses.
1840 * Returns: The latency or %GST_CLOCK_TIME_NONE if the element does not sync
1843 gst_aggregator_get_latency (GstAggregator * self)
1848 ret = gst_aggregator_get_latency_unlocked (self);
1855 gst_aggregator_send_event (GstElement * element, GstEvent * event)
1857 GstAggregator *self = GST_AGGREGATOR (element);
1859 GST_STATE_LOCK (element);
1860 if (GST_EVENT_TYPE (event) == GST_EVENT_SEEK &&
1861 GST_STATE (element) < GST_STATE_PAUSED) {
1865 GstSeekType start_type, stop_type;
1868 gst_event_parse_seek (event, &rate, &fmt, &flags, &start_type,
1869 &start, &stop_type, &stop);
1871 GST_OBJECT_LOCK (self);
1872 gst_segment_do_seek (&GST_AGGREGATOR_PAD (self->srcpad)->segment, rate, fmt,
1873 flags, start_type, start, stop_type, stop, NULL);
1874 self->priv->seqnum = gst_event_get_seqnum (event);
1875 self->priv->first_buffer = FALSE;
1876 GST_OBJECT_UNLOCK (self);
1878 GST_DEBUG_OBJECT (element, "Storing segment %" GST_PTR_FORMAT, event);
1880 GST_STATE_UNLOCK (element);
1883 return GST_ELEMENT_CLASS (aggregator_parent_class)->send_event (element,
1888 gst_aggregator_default_src_query (GstAggregator * self, GstQuery * query)
1890 gboolean res = TRUE;
1892 switch (GST_QUERY_TYPE (query)) {
1893 case GST_QUERY_SEEKING:
1897 /* don't pass it along as some (file)sink might claim it does
1898 * whereas with a collectpads in between that will not likely work */
1899 gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
1900 gst_query_set_seeking (query, format, FALSE, 0, -1);
1905 case GST_QUERY_LATENCY:
1907 res = gst_aggregator_query_latency_unlocked (self, query);
1911 return gst_pad_query_default (self->srcpad, GST_OBJECT (self), query);
1918 gst_aggregator_event_forward_func (GstPad * pad, gpointer user_data)
1920 EventData *evdata = user_data;
1921 gboolean ret = TRUE;
1922 GstPad *peer = gst_pad_get_peer (pad);
1923 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
1926 if (evdata->only_to_active_pads && aggpad->priv->first_buffer) {
1927 GST_DEBUG_OBJECT (pad, "not sending event to inactive pad");
1930 ret = gst_pad_send_event (peer, gst_event_ref (evdata->event));
1931 GST_DEBUG_OBJECT (pad, "return of event push is %d", ret);
1936 if (GST_EVENT_TYPE (evdata->event) == GST_EVENT_SEEK) {
1937 GstQuery *seeking = gst_query_new_seeking (GST_FORMAT_TIME);
1939 GST_DEBUG_OBJECT (pad, "Event %" GST_PTR_FORMAT " failed", evdata->event);
1941 if (gst_pad_query (peer, seeking)) {
1944 gst_query_parse_seeking (seeking, NULL, &seekable, NULL, NULL);
1946 if (seekable == FALSE) {
1947 GST_INFO_OBJECT (pad,
1948 "Source not seekable, We failed but it does not matter!");
1953 GST_ERROR_OBJECT (pad, "Query seeking FAILED");
1956 gst_query_unref (seeking);
1959 if (evdata->flush) {
1961 aggpad->priv->pending_flush_start = FALSE;
1962 aggpad->priv->pending_flush_stop = FALSE;
1963 PAD_UNLOCK (aggpad);
1966 evdata->one_actually_seeked = TRUE;
1969 evdata->result &= ret;
1972 gst_object_unref (peer);
1974 /* Always send to all pads */
1979 gst_aggregator_forward_event_to_all_sinkpads (GstAggregator * self,
1982 evdata->result = TRUE;
1983 evdata->one_actually_seeked = FALSE;
1985 /* We first need to set all pads as flushing in a first pass
1986 * as flush_start flush_stop is sometimes sent synchronously
1987 * while we send the seek event */
1988 if (evdata->flush) {
1991 GST_OBJECT_LOCK (self);
1992 for (l = GST_ELEMENT_CAST (self)->sinkpads; l != NULL; l = l->next) {
1993 GstAggregatorPad *pad = l->data;
1996 pad->priv->pending_flush_start = TRUE;
1997 pad->priv->pending_flush_stop = FALSE;
2000 GST_OBJECT_UNLOCK (self);
2003 gst_pad_forward (self->srcpad, gst_aggregator_event_forward_func, evdata);
2005 gst_event_unref (evdata->event);
2009 gst_aggregator_do_seek (GstAggregator * self, GstEvent * event)
2014 GstSeekType start_type, stop_type;
2017 EventData evdata = { 0, };
2018 GstAggregatorPrivate *priv = self->priv;
2020 gst_event_parse_seek (event, &rate, &fmt, &flags, &start_type,
2021 &start, &stop_type, &stop);
2023 GST_INFO_OBJECT (self, "starting SEEK");
2025 flush = flags & GST_SEEK_FLAG_FLUSH;
2027 GST_OBJECT_LOCK (self);
2029 priv->pending_flush_start = TRUE;
2030 priv->flush_seeking = TRUE;
2033 gst_segment_do_seek (&GST_AGGREGATOR_PAD (self->srcpad)->segment, rate, fmt,
2034 flags, start_type, start, stop_type, stop, NULL);
2036 /* Seeking sets a position */
2037 self->priv->first_buffer = FALSE;
2038 GST_OBJECT_UNLOCK (self);
2040 /* forward the seek upstream */
2041 evdata.event = event;
2042 evdata.flush = flush;
2043 evdata.only_to_active_pads = FALSE;
2044 gst_aggregator_forward_event_to_all_sinkpads (self, &evdata);
2047 if (!evdata.result || !evdata.one_actually_seeked) {
2048 GST_OBJECT_LOCK (self);
2049 priv->flush_seeking = FALSE;
2050 priv->pending_flush_start = FALSE;
2051 GST_OBJECT_UNLOCK (self);
2054 GST_INFO_OBJECT (self, "seek done, result: %d", evdata.result);
2056 return evdata.result;
2060 gst_aggregator_default_src_event (GstAggregator * self, GstEvent * event)
2062 EventData evdata = { 0, };
2064 switch (GST_EVENT_TYPE (event)) {
2065 case GST_EVENT_SEEK:
2066 /* _do_seek() unrefs the event. */
2067 return gst_aggregator_do_seek (self, event);
2068 case GST_EVENT_NAVIGATION:
2069 /* navigation is rather pointless. */
2070 gst_event_unref (event);
2076 /* Don't forward QOS events to pads that had no active buffer yet. Otherwise
2077 * they will receive a QOS event that has earliest_time=0 (because we can't
2078 * have negative timestamps), and consider their buffer as too late */
2079 evdata.event = event;
2080 evdata.flush = FALSE;
2081 evdata.only_to_active_pads = GST_EVENT_TYPE (event) == GST_EVENT_QOS;
2082 gst_aggregator_forward_event_to_all_sinkpads (self, &evdata);
2083 return evdata.result;
2087 gst_aggregator_src_pad_event_func (GstPad * pad, GstObject * parent,
2090 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
2092 return klass->src_event (GST_AGGREGATOR (parent), event);
2096 gst_aggregator_src_pad_query_func (GstPad * pad, GstObject * parent,
2099 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
2101 return klass->src_query (GST_AGGREGATOR (parent), query);
2105 gst_aggregator_src_pad_activate_mode_func (GstPad * pad,
2106 GstObject * parent, GstPadMode mode, gboolean active)
2108 GstAggregator *self = GST_AGGREGATOR (parent);
2109 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
2111 if (klass->src_activate) {
2112 if (klass->src_activate (self, mode, active) == FALSE) {
2117 if (active == TRUE) {
2119 case GST_PAD_MODE_PUSH:
2121 GST_INFO_OBJECT (pad, "Activating pad!");
2122 gst_aggregator_start_srcpad_task (self);
2127 GST_ERROR_OBJECT (pad, "Only supported mode is PUSH");
2134 GST_INFO_OBJECT (self, "Deactivating srcpad");
2135 gst_aggregator_stop_srcpad_task (self, FALSE);
2141 gst_aggregator_default_sink_query (GstAggregator * self,
2142 GstAggregatorPad * aggpad, GstQuery * query)
2144 GstPad *pad = GST_PAD (aggpad);
2146 if (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION) {
2147 GstQuery *decide_query = NULL;
2148 GstAggregatorClass *agg_class;
2151 GST_OBJECT_LOCK (self);
2153 if (G_UNLIKELY (!aggpad->priv->negotiated)) {
2154 GST_DEBUG_OBJECT (self,
2155 "not negotiated yet, can't answer ALLOCATION query");
2156 PAD_UNLOCK (aggpad);
2157 GST_OBJECT_UNLOCK (self);
2162 if ((decide_query = self->priv->allocation_query))
2163 gst_query_ref (decide_query);
2164 PAD_UNLOCK (aggpad);
2165 GST_OBJECT_UNLOCK (self);
2167 GST_DEBUG_OBJECT (self,
2168 "calling propose allocation with query %" GST_PTR_FORMAT, decide_query);
2170 agg_class = GST_AGGREGATOR_GET_CLASS (self);
2172 /* pass the query to the propose_allocation vmethod if any */
2173 if (agg_class->propose_allocation)
2174 ret = agg_class->propose_allocation (self, aggpad, decide_query, query);
2179 gst_query_unref (decide_query);
2181 GST_DEBUG_OBJECT (self, "ALLOCATION ret %d, %" GST_PTR_FORMAT, ret, query);
2185 return gst_pad_query_default (pad, GST_OBJECT (self), query);
2189 gst_aggregator_finalize (GObject * object)
2191 GstAggregator *self = (GstAggregator *) object;
2193 g_mutex_clear (&self->priv->src_lock);
2194 g_cond_clear (&self->priv->src_cond);
2196 G_OBJECT_CLASS (aggregator_parent_class)->finalize (object);
2200 * gst_aggregator_set_latency_property:
2201 * @agg: a #GstAggregator
2202 * @latency: the new latency value (in nanoseconds).
2204 * Sets the new latency value to @latency. This value is used to limit the
2205 * amount of time a pad waits for data to appear before considering the pad
2209 gst_aggregator_set_latency_property (GstAggregator * self, GstClockTime latency)
2213 g_return_if_fail (GST_IS_AGGREGATOR (self));
2214 g_return_if_fail (GST_CLOCK_TIME_IS_VALID (latency));
2217 changed = (self->priv->latency != latency);
2222 GST_OBJECT_LOCK (self);
2223 /* First lock all the pads */
2224 for (item = GST_ELEMENT_CAST (self)->sinkpads; item; item = item->next) {
2225 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (item->data);
2229 self->priv->latency = latency;
2231 SRC_BROADCAST (self);
2233 /* Now wake up the pads */
2234 for (item = GST_ELEMENT_CAST (self)->sinkpads; item; item = item->next) {
2235 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (item->data);
2236 PAD_BROADCAST_EVENT (aggpad);
2237 PAD_UNLOCK (aggpad);
2239 GST_OBJECT_UNLOCK (self);
2245 gst_element_post_message (GST_ELEMENT_CAST (self),
2246 gst_message_new_latency (GST_OBJECT_CAST (self)));
2250 * gst_aggregator_get_latency_property:
2251 * @agg: a #GstAggregator
2253 * Gets the latency value. See gst_aggregator_set_latency for
2256 * Returns: The time in nanoseconds to wait for data to arrive on a sink pad
2257 * before a pad is deemed unresponsive. A value of -1 means an
2261 gst_aggregator_get_latency_property (GstAggregator * agg)
2265 g_return_val_if_fail (GST_IS_AGGREGATOR (agg), GST_CLOCK_TIME_NONE);
2267 GST_OBJECT_LOCK (agg);
2268 res = agg->priv->latency;
2269 GST_OBJECT_UNLOCK (agg);
2275 gst_aggregator_set_property (GObject * object, guint prop_id,
2276 const GValue * value, GParamSpec * pspec)
2278 GstAggregator *agg = GST_AGGREGATOR (object);
2282 gst_aggregator_set_latency_property (agg, g_value_get_uint64 (value));
2284 case PROP_MIN_UPSTREAM_LATENCY:
2286 agg->priv->upstream_latency_min = g_value_get_uint64 (value);
2289 case PROP_START_TIME_SELECTION:
2290 agg->priv->start_time_selection = g_value_get_enum (value);
2292 case PROP_START_TIME:
2293 agg->priv->start_time = g_value_get_uint64 (value);
2296 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
2302 gst_aggregator_get_property (GObject * object, guint prop_id,
2303 GValue * value, GParamSpec * pspec)
2305 GstAggregator *agg = GST_AGGREGATOR (object);
2309 g_value_set_uint64 (value, gst_aggregator_get_latency_property (agg));
2311 case PROP_MIN_UPSTREAM_LATENCY:
2313 g_value_set_uint64 (value, agg->priv->upstream_latency_min);
2316 case PROP_START_TIME_SELECTION:
2317 g_value_set_enum (value, agg->priv->start_time_selection);
2319 case PROP_START_TIME:
2320 g_value_set_uint64 (value, agg->priv->start_time);
2323 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
2328 /* GObject vmethods implementations */
2330 gst_aggregator_class_init (GstAggregatorClass * klass)
2332 GObjectClass *gobject_class = (GObjectClass *) klass;
2333 GstElementClass *gstelement_class = (GstElementClass *) klass;
2335 aggregator_parent_class = g_type_class_peek_parent (klass);
2337 GST_DEBUG_CATEGORY_INIT (aggregator_debug, "aggregator",
2338 GST_DEBUG_FG_MAGENTA, "GstAggregator");
2340 if (aggregator_private_offset != 0)
2341 g_type_class_adjust_private_offset (klass, &aggregator_private_offset);
2343 klass->finish_buffer = gst_aggregator_default_finish_buffer;
2345 klass->sink_event = gst_aggregator_default_sink_event;
2346 klass->sink_query = gst_aggregator_default_sink_query;
2348 klass->src_event = gst_aggregator_default_src_event;
2349 klass->src_query = gst_aggregator_default_src_query;
2351 klass->create_new_pad = gst_aggregator_default_create_new_pad;
2352 klass->update_src_caps = gst_aggregator_default_update_src_caps;
2353 klass->fixate_src_caps = gst_aggregator_default_fixate_src_caps;
2354 klass->negotiated_src_caps = gst_aggregator_default_negotiated_src_caps;
2356 gstelement_class->request_new_pad =
2357 GST_DEBUG_FUNCPTR (gst_aggregator_request_new_pad);
2358 gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_aggregator_send_event);
2359 gstelement_class->release_pad =
2360 GST_DEBUG_FUNCPTR (gst_aggregator_release_pad);
2361 gstelement_class->change_state =
2362 GST_DEBUG_FUNCPTR (gst_aggregator_change_state);
2364 gobject_class->set_property = gst_aggregator_set_property;
2365 gobject_class->get_property = gst_aggregator_get_property;
2366 gobject_class->finalize = gst_aggregator_finalize;
2368 g_object_class_install_property (gobject_class, PROP_LATENCY,
2369 g_param_spec_uint64 ("latency", "Buffer latency",
2370 "Additional latency in live mode to allow upstream "
2371 "to take longer to produce buffers for the current "
2372 "position (in nanoseconds)", 0, G_MAXUINT64,
2373 DEFAULT_LATENCY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
2376 * GstAggregator:min-upstream-latency:
2378 * Force minimum upstream latency (in nanoseconds). When sources with a
2379 * higher latency are expected to be plugged in dynamically after the
2380 * aggregator has started playing, this allows overriding the minimum
2381 * latency reported by the initial source(s). This is only taken into
2382 * account when larger than the actually reported minimum latency.
2386 g_object_class_install_property (gobject_class, PROP_MIN_UPSTREAM_LATENCY,
2387 g_param_spec_uint64 ("min-upstream-latency", "Buffer latency",
2388 "When sources with a higher latency are expected to be plugged "
2389 "in dynamically after the aggregator has started playing, "
2390 "this allows overriding the minimum latency reported by the "
2391 "initial source(s). This is only taken into account when larger "
2392 "than the actually reported minimum latency. (nanoseconds)",
2394 DEFAULT_LATENCY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
2396 g_object_class_install_property (gobject_class, PROP_START_TIME_SELECTION,
2397 g_param_spec_enum ("start-time-selection", "Start Time Selection",
2398 "Decides which start time is output",
2399 gst_aggregator_start_time_selection_get_type (),
2400 DEFAULT_START_TIME_SELECTION,
2401 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
2403 g_object_class_install_property (gobject_class, PROP_START_TIME,
2404 g_param_spec_uint64 ("start-time", "Start Time",
2405 "Start time to use if start-time-selection=set", 0,
2407 DEFAULT_START_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
2410 static inline gpointer
2411 gst_aggregator_get_instance_private (GstAggregator * self)
2413 return (G_STRUCT_MEMBER_P (self, aggregator_private_offset));
2417 gst_aggregator_init (GstAggregator * self, GstAggregatorClass * klass)
2419 GstPadTemplate *pad_template;
2420 GstAggregatorPrivate *priv;
2422 g_return_if_fail (klass->aggregate != NULL);
2424 self->priv = gst_aggregator_get_instance_private (self);
2429 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (klass), "src");
2430 g_return_if_fail (pad_template != NULL);
2432 priv->max_padserial = -1;
2433 priv->tags_changed = FALSE;
2435 self->priv->peer_latency_live = FALSE;
2436 self->priv->peer_latency_min = self->priv->sub_latency_min = 0;
2437 self->priv->peer_latency_max = self->priv->sub_latency_max = 0;
2438 self->priv->has_peer_latency = FALSE;
2440 self->srcpad = gst_pad_new_from_template (pad_template, "src");
2442 gst_aggregator_reset_flow_values (self);
2444 gst_pad_set_event_function (self->srcpad,
2445 GST_DEBUG_FUNCPTR (gst_aggregator_src_pad_event_func));
2446 gst_pad_set_query_function (self->srcpad,
2447 GST_DEBUG_FUNCPTR (gst_aggregator_src_pad_query_func));
2448 gst_pad_set_activatemode_function (self->srcpad,
2449 GST_DEBUG_FUNCPTR (gst_aggregator_src_pad_activate_mode_func));
2451 gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
2453 self->priv->upstream_latency_min = DEFAULT_MIN_UPSTREAM_LATENCY;
2454 self->priv->latency = DEFAULT_LATENCY;
2455 self->priv->start_time_selection = DEFAULT_START_TIME_SELECTION;
2456 self->priv->start_time = DEFAULT_START_TIME;
2458 g_mutex_init (&self->priv->src_lock);
2459 g_cond_init (&self->priv->src_cond);
2462 /* we can't use G_DEFINE_ABSTRACT_TYPE because we need the klass in the _init
2463 * method to get to the padtemplates */
2465 gst_aggregator_get_type (void)
2467 static volatile gsize type = 0;
2469 if (g_once_init_enter (&type)) {
2471 static const GTypeInfo info = {
2472 sizeof (GstAggregatorClass),
2475 (GClassInitFunc) gst_aggregator_class_init,
2478 sizeof (GstAggregator),
2480 (GInstanceInitFunc) gst_aggregator_init,
2483 _type = g_type_register_static (GST_TYPE_ELEMENT,
2484 "GstAggregator", &info, G_TYPE_FLAG_ABSTRACT);
2486 aggregator_private_offset =
2487 g_type_add_instance_private (_type, sizeof (GstAggregatorPrivate));
2489 g_once_init_leave (&type, _type);
2494 /* Must be called with SRC lock and PAD lock held */
2496 gst_aggregator_pad_has_space (GstAggregator * self, GstAggregatorPad * aggpad)
2498 /* Empty queue always has space */
2499 if (aggpad->priv->num_buffers == 0 && aggpad->priv->clipped_buffer == NULL)
2502 /* We also want at least two buffers, one is being processed and one is ready
2503 * for the next iteration when we operate in live mode. */
2504 if (self->priv->peer_latency_live && aggpad->priv->num_buffers < 2)
2507 /* zero latency, if there is a buffer, it's full */
2508 if (self->priv->latency == 0)
2511 /* Allow no more buffers than the latency */
2512 return (aggpad->priv->time_level <= self->priv->latency);
2515 /* Must be called with the PAD_LOCK held */
2517 apply_buffer (GstAggregatorPad * aggpad, GstBuffer * buffer, gboolean head)
2519 GstClockTime timestamp;
2521 if (GST_BUFFER_DTS_IS_VALID (buffer))
2522 timestamp = GST_BUFFER_DTS (buffer);
2524 timestamp = GST_BUFFER_PTS (buffer);
2526 if (timestamp == GST_CLOCK_TIME_NONE) {
2528 timestamp = aggpad->priv->head_position;
2530 timestamp = aggpad->priv->tail_position;
2534 if (GST_BUFFER_DURATION_IS_VALID (buffer))
2535 timestamp += GST_BUFFER_DURATION (buffer);
2538 aggpad->priv->head_position = timestamp;
2540 aggpad->priv->tail_position = timestamp;
2542 update_time_level (aggpad, head);
2546 * Can be called either from the sinkpad's chain function or from the srcpad's
2547 * thread in the case of a buffer synthetized from a GAP event.
2548 * Because of this second case, FLUSH_LOCK can't be used here.
2551 static GstFlowReturn
2552 gst_aggregator_pad_chain_internal (GstAggregator * self,
2553 GstAggregatorPad * aggpad, GstBuffer * buffer, gboolean head)
2555 GstFlowReturn flow_return;
2556 GstClockTime buf_pts;
2559 flow_return = aggpad->priv->flow_return;
2560 if (flow_return != GST_FLOW_OK)
2563 PAD_UNLOCK (aggpad);
2565 buf_pts = GST_BUFFER_PTS (buffer);
2569 GST_OBJECT_LOCK (self);
2572 if (aggpad->priv->first_buffer) {
2573 self->priv->has_peer_latency = FALSE;
2574 aggpad->priv->first_buffer = FALSE;
2577 if ((gst_aggregator_pad_has_space (self, aggpad) || !head)
2578 && aggpad->priv->flow_return == GST_FLOW_OK) {
2580 g_queue_push_head (&aggpad->priv->data, buffer);
2582 g_queue_push_tail (&aggpad->priv->data, buffer);
2583 apply_buffer (aggpad, buffer, head);
2584 aggpad->priv->num_buffers++;
2586 SRC_BROADCAST (self);
2590 flow_return = aggpad->priv->flow_return;
2591 if (flow_return != GST_FLOW_OK) {
2592 GST_OBJECT_UNLOCK (self);
2596 GST_DEBUG_OBJECT (aggpad, "Waiting for buffer to be consumed");
2597 GST_OBJECT_UNLOCK (self);
2599 PAD_WAIT_EVENT (aggpad);
2601 PAD_UNLOCK (aggpad);
2604 if (self->priv->first_buffer) {
2605 GstClockTime start_time;
2606 GstAggregatorPad *srcpad = GST_AGGREGATOR_PAD (self->srcpad);
2608 switch (self->priv->start_time_selection) {
2609 case GST_AGGREGATOR_START_TIME_SELECTION_ZERO:
2613 case GST_AGGREGATOR_START_TIME_SELECTION_FIRST:
2614 GST_OBJECT_LOCK (aggpad);
2615 if (aggpad->priv->head_segment.format == GST_FORMAT_TIME) {
2616 start_time = buf_pts;
2617 if (start_time != -1) {
2618 start_time = MAX (start_time, aggpad->priv->head_segment.start);
2620 gst_segment_to_running_time (&aggpad->priv->head_segment,
2621 GST_FORMAT_TIME, start_time);
2625 GST_WARNING_OBJECT (aggpad,
2626 "Ignoring request of selecting the first start time "
2627 "as the segment is a %s segment instead of a time segment",
2628 gst_format_get_name (aggpad->segment.format));
2630 GST_OBJECT_UNLOCK (aggpad);
2632 case GST_AGGREGATOR_START_TIME_SELECTION_SET:
2633 start_time = self->priv->start_time;
2634 if (start_time == -1)
2639 if (start_time != -1) {
2640 if (srcpad->segment.position == -1)
2641 srcpad->segment.position = start_time;
2643 srcpad->segment.position = MIN (start_time, srcpad->segment.position);
2645 GST_DEBUG_OBJECT (self, "Selecting start time %" GST_TIME_FORMAT,
2646 GST_TIME_ARGS (start_time));
2650 PAD_UNLOCK (aggpad);
2651 GST_OBJECT_UNLOCK (self);
2654 GST_DEBUG_OBJECT (aggpad, "Done chaining");
2659 PAD_UNLOCK (aggpad);
2661 GST_DEBUG_OBJECT (aggpad, "Pad is %s, dropping buffer",
2662 gst_flow_get_name (flow_return));
2664 gst_buffer_unref (buffer);
2669 static GstFlowReturn
2670 gst_aggregator_pad_chain (GstPad * pad, GstObject * object, GstBuffer * buffer)
2673 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
2675 PAD_FLUSH_LOCK (aggpad);
2677 ret = gst_aggregator_pad_chain_internal (GST_AGGREGATOR_CAST (object),
2678 aggpad, buffer, TRUE);
2680 PAD_FLUSH_UNLOCK (aggpad);
2686 gst_aggregator_pad_query_func (GstPad * pad, GstObject * parent,
2689 GstAggregator *self = GST_AGGREGATOR (parent);
2690 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
2692 if (GST_QUERY_IS_SERIALIZED (query)) {
2694 gboolean ret = FALSE;
2699 if (aggpad->priv->flow_return != GST_FLOW_OK) {
2704 g_queue_push_head (&aggpad->priv->data, query);
2705 SRC_BROADCAST (self);
2708 while (!gst_aggregator_pad_queue_is_empty (aggpad)
2709 && aggpad->priv->flow_return == GST_FLOW_OK) {
2710 GST_DEBUG_OBJECT (aggpad, "Waiting for buffer to be consumed");
2711 PAD_WAIT_EVENT (aggpad);
2714 s = gst_query_writable_structure (query);
2715 if (gst_structure_get_boolean (s, "gst-aggregator-retval", &ret))
2716 gst_structure_remove_field (s, "gst-aggregator-retval");
2718 g_queue_remove (&aggpad->priv->data, query);
2720 if (aggpad->priv->flow_return != GST_FLOW_OK)
2723 PAD_UNLOCK (aggpad);
2727 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
2729 return klass->sink_query (self, aggpad, query);
2733 GST_DEBUG_OBJECT (aggpad, "Pad is %s, dropping query",
2734 gst_flow_get_name (aggpad->priv->flow_return));
2735 PAD_UNLOCK (aggpad);
2740 /* Queue serialized events and let the others go through directly.
2741 * The queued events with be handled from the src-pad task in
2742 * gst_aggregator_do_events_and_queries().
2744 static GstFlowReturn
2745 gst_aggregator_pad_event_func (GstPad * pad, GstObject * parent,
2748 GstFlowReturn ret = GST_FLOW_OK;
2749 GstAggregator *self = GST_AGGREGATOR (parent);
2750 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
2752 if (GST_EVENT_IS_SERIALIZED (event)
2753 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) {
2757 if (aggpad->priv->flow_return != GST_FLOW_OK)
2760 if (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
2761 GST_OBJECT_LOCK (aggpad);
2762 gst_event_copy_segment (event, &aggpad->priv->head_segment);
2763 aggpad->priv->head_position = aggpad->priv->head_segment.position;
2764 update_time_level (aggpad, TRUE);
2765 GST_OBJECT_UNLOCK (aggpad);
2768 GST_DEBUG_OBJECT (aggpad, "Store event in queue: %" GST_PTR_FORMAT, event);
2769 g_queue_push_head (&aggpad->priv->data, event);
2770 SRC_BROADCAST (self);
2771 PAD_UNLOCK (aggpad);
2774 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
2776 if (!klass->sink_event (self, aggpad, event)) {
2777 /* Copied from GstPad to convert boolean to a GstFlowReturn in
2778 * the event handling func */
2779 ret = GST_FLOW_ERROR;
2786 GST_DEBUG_OBJECT (aggpad, "Pad is %s, dropping event",
2787 gst_flow_get_name (aggpad->priv->flow_return));
2788 PAD_UNLOCK (aggpad);
2790 if (GST_EVENT_IS_STICKY (event))
2791 gst_pad_store_sticky_event (pad, event);
2792 gst_event_unref (event);
2794 return aggpad->priv->flow_return;
2798 gst_aggregator_pad_activate_mode_func (GstPad * pad,
2799 GstObject * parent, GstPadMode mode, gboolean active)
2801 GstAggregator *self = GST_AGGREGATOR (parent);
2802 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
2804 if (active == FALSE) {
2806 gst_aggregator_pad_set_flushing (aggpad, GST_FLOW_FLUSHING, TRUE);
2807 SRC_BROADCAST (self);
2811 aggpad->priv->flow_return = GST_FLOW_OK;
2812 PAD_BROADCAST_EVENT (aggpad);
2813 PAD_UNLOCK (aggpad);
2819 /***********************************
2820 * GstAggregatorPad implementation *
2821 ************************************/
2822 G_DEFINE_TYPE_WITH_PRIVATE (GstAggregatorPad, gst_aggregator_pad, GST_TYPE_PAD);
2825 gst_aggregator_pad_constructed (GObject * object)
2827 GstPad *pad = GST_PAD (object);
2829 if (GST_PAD_IS_SINK (pad)) {
2830 gst_pad_set_chain_function (pad,
2831 GST_DEBUG_FUNCPTR (gst_aggregator_pad_chain));
2832 gst_pad_set_event_full_function_full (pad,
2833 GST_DEBUG_FUNCPTR (gst_aggregator_pad_event_func), NULL, NULL);
2834 gst_pad_set_query_function (pad,
2835 GST_DEBUG_FUNCPTR (gst_aggregator_pad_query_func));
2836 gst_pad_set_activatemode_function (pad,
2837 GST_DEBUG_FUNCPTR (gst_aggregator_pad_activate_mode_func));
2842 gst_aggregator_pad_finalize (GObject * object)
2844 GstAggregatorPad *pad = (GstAggregatorPad *) object;
2846 g_cond_clear (&pad->priv->event_cond);
2847 g_mutex_clear (&pad->priv->flush_lock);
2848 g_mutex_clear (&pad->priv->lock);
2850 G_OBJECT_CLASS (gst_aggregator_pad_parent_class)->finalize (object);
2854 gst_aggregator_pad_dispose (GObject * object)
2856 GstAggregatorPad *pad = (GstAggregatorPad *) object;
2858 gst_aggregator_pad_set_flushing (pad, GST_FLOW_FLUSHING, TRUE);
2860 G_OBJECT_CLASS (gst_aggregator_pad_parent_class)->dispose (object);
2864 gst_aggregator_pad_class_init (GstAggregatorPadClass * klass)
2866 GObjectClass *gobject_class = (GObjectClass *) klass;
2868 gobject_class->constructed = gst_aggregator_pad_constructed;
2869 gobject_class->finalize = gst_aggregator_pad_finalize;
2870 gobject_class->dispose = gst_aggregator_pad_dispose;
2874 gst_aggregator_pad_init (GstAggregatorPad * pad)
2876 pad->priv = gst_aggregator_pad_get_instance_private (pad);
2878 g_queue_init (&pad->priv->data);
2879 g_cond_init (&pad->priv->event_cond);
2881 g_mutex_init (&pad->priv->flush_lock);
2882 g_mutex_init (&pad->priv->lock);
2884 gst_aggregator_pad_reset_unlocked (pad);
2885 pad->priv->negotiated = FALSE;
2888 /* Must be called with the PAD_LOCK held */
2890 gst_aggregator_pad_buffer_consumed (GstAggregatorPad * pad)
2892 pad->priv->num_buffers--;
2893 GST_TRACE_OBJECT (pad, "Consuming buffer");
2894 PAD_BROADCAST_EVENT (pad);
2897 /* Must be called with the PAD_LOCK held */
2899 gst_aggregator_pad_clip_buffer_unlocked (GstAggregatorPad * pad)
2901 GstAggregator *self = NULL;
2902 GstAggregatorClass *aggclass = NULL;
2903 GstBuffer *buffer = NULL;
2905 while (pad->priv->clipped_buffer == NULL &&
2906 GST_IS_BUFFER (g_queue_peek_tail (&pad->priv->data))) {
2907 buffer = g_queue_pop_tail (&pad->priv->data);
2909 apply_buffer (pad, buffer, FALSE);
2911 /* We only take the parent here so that it's not taken if the buffer is
2912 * already clipped or if the queue is empty.
2915 self = GST_AGGREGATOR (gst_pad_get_parent_element (GST_PAD (pad)));
2917 gst_buffer_unref (buffer);
2921 aggclass = GST_AGGREGATOR_GET_CLASS (self);
2924 if (aggclass->clip) {
2925 GST_TRACE_OBJECT (pad, "Clipping: %" GST_PTR_FORMAT, buffer);
2927 buffer = aggclass->clip (self, pad, buffer);
2929 if (buffer == NULL) {
2930 gst_aggregator_pad_buffer_consumed (pad);
2931 GST_TRACE_OBJECT (pad, "Clipping consumed the buffer");
2935 pad->priv->clipped_buffer = buffer;
2939 gst_object_unref (self);
2943 * gst_aggregator_pad_pop_buffer:
2944 * @pad: the pad to get buffer from
2946 * Steal the ref to the buffer currently queued in @pad.
2948 * Returns: (transfer full): The buffer in @pad or NULL if no buffer was
2949 * queued. You should unref the buffer after usage.
2952 gst_aggregator_pad_pop_buffer (GstAggregatorPad * pad)
2958 if (pad->priv->flow_return != GST_FLOW_OK) {
2963 gst_aggregator_pad_clip_buffer_unlocked (pad);
2965 buffer = pad->priv->clipped_buffer;
2968 pad->priv->clipped_buffer = NULL;
2969 gst_aggregator_pad_buffer_consumed (pad);
2970 GST_DEBUG_OBJECT (pad, "Consumed: %" GST_PTR_FORMAT, buffer);
2979 * gst_aggregator_pad_drop_buffer:
2980 * @pad: the pad where to drop any pending buffer
2982 * Drop the buffer currently queued in @pad.
2984 * Returns: TRUE if there was a buffer queued in @pad, or FALSE if not.
2987 gst_aggregator_pad_drop_buffer (GstAggregatorPad * pad)
2991 buf = gst_aggregator_pad_pop_buffer (pad);
2996 gst_buffer_unref (buf);
3001 * gst_aggregator_pad_peek_buffer:
3002 * @pad: the pad to get buffer from
3004 * Returns: (transfer full): A reference to the buffer in @pad or
3005 * NULL if no buffer was queued. You should unref the buffer after
3009 gst_aggregator_pad_peek_buffer (GstAggregatorPad * pad)
3015 if (pad->priv->flow_return != GST_FLOW_OK) {
3020 gst_aggregator_pad_clip_buffer_unlocked (pad);
3022 if (pad->priv->clipped_buffer) {
3023 buffer = gst_buffer_ref (pad->priv->clipped_buffer);
3033 * gst_aggregator_pad_has_buffer:
3034 * @pad: the pad to check the buffer on
3036 * This checks if a pad has a buffer available that will be returned by
3037 * a call to gst_aggregator_pad_peek_buffer() or
3038 * gst_aggregator_pad_pop_buffer().
3040 * Returns: %TRUE if the pad has a buffer available as the next thing.
3045 gst_aggregator_pad_has_buffer (GstAggregatorPad * pad)
3047 gboolean has_buffer;
3050 gst_aggregator_pad_clip_buffer_unlocked (pad);
3051 has_buffer = (pad->priv->clipped_buffer != NULL);
3058 * gst_aggregator_pad_is_eos:
3059 * @pad: an aggregator pad
3061 * Returns: %TRUE if the pad is EOS, otherwise %FALSE.
3064 gst_aggregator_pad_is_eos (GstAggregatorPad * pad)
3069 is_eos = pad->priv->eos;
3077 * gst_aggregator_merge_tags:
3078 * @self: a #GstAggregator
3079 * @tags: a #GstTagList to merge
3080 * @mode: the #GstTagMergeMode to use
3082 * Adds tags to so-called pending tags, which will be processed
3083 * before pushing out data downstream.
3085 * Note that this is provided for convenience, and the subclass is
3086 * not required to use this and can still do tag handling on its own.
3091 gst_aggregator_merge_tags (GstAggregator * self,
3092 const GstTagList * tags, GstTagMergeMode mode)
3096 g_return_if_fail (GST_IS_AGGREGATOR (self));
3097 g_return_if_fail (tags == NULL || GST_IS_TAG_LIST (tags));
3099 /* FIXME Check if we can use OBJECT lock here! */
3100 GST_OBJECT_LOCK (self);
3102 GST_DEBUG_OBJECT (self, "merging tags %" GST_PTR_FORMAT, tags);
3103 otags = self->priv->tags;
3104 self->priv->tags = gst_tag_list_merge (self->priv->tags, tags, mode);
3106 gst_tag_list_unref (otags);
3107 self->priv->tags_changed = TRUE;
3108 GST_OBJECT_UNLOCK (self);
3113 * gst_aggregator_set_latency:
3114 * @self: a #GstAggregator
3115 * @min_latency: minimum latency
3116 * @max_latency: maximum latency
3118 * Lets #GstAggregator sub-classes tell the baseclass what their internal
3119 * latency is. Will also post a LATENCY message on the bus so the pipeline
3120 * can reconfigure its global latency.
3123 gst_aggregator_set_latency (GstAggregator * self,
3124 GstClockTime min_latency, GstClockTime max_latency)
3126 gboolean changed = FALSE;
3128 g_return_if_fail (GST_IS_AGGREGATOR (self));
3129 g_return_if_fail (GST_CLOCK_TIME_IS_VALID (min_latency));
3130 g_return_if_fail (max_latency >= min_latency);
3133 if (self->priv->sub_latency_min != min_latency) {
3134 self->priv->sub_latency_min = min_latency;
3137 if (self->priv->sub_latency_max != max_latency) {
3138 self->priv->sub_latency_max = max_latency;
3143 SRC_BROADCAST (self);
3147 gst_element_post_message (GST_ELEMENT_CAST (self),
3148 gst_message_new_latency (GST_OBJECT_CAST (self)));
3153 * gst_aggregator_get_buffer_pool:
3154 * @self: a #GstAggregator
3156 * Returns: (transfer full): the instance of the #GstBufferPool used
3157 * by @trans; free it after use it
3160 gst_aggregator_get_buffer_pool (GstAggregator * self)
3162 GstBufferPool *pool;
3164 g_return_val_if_fail (GST_IS_AGGREGATOR (self), NULL);
3166 GST_OBJECT_LOCK (self);
3167 pool = self->priv->pool;
3169 gst_object_ref (pool);
3170 GST_OBJECT_UNLOCK (self);
3176 * gst_aggregator_get_allocator:
3177 * @self: a #GstAggregator
3178 * @allocator: (out) (allow-none) (transfer full): the #GstAllocator
3180 * @params: (out) (allow-none) (transfer full): the
3181 * #GstAllocationParams of @allocator
3183 * Lets #GstAggregator sub-classes get the memory @allocator
3184 * acquired by the base class and its @params.
3186 * Unref the @allocator after use it.
3189 gst_aggregator_get_allocator (GstAggregator * self,
3190 GstAllocator ** allocator, GstAllocationParams * params)
3192 g_return_if_fail (GST_IS_AGGREGATOR (self));
3195 *allocator = self->priv->allocator ?
3196 gst_object_ref (self->priv->allocator) : NULL;
3199 *params = self->priv->allocation_params;
3203 * gst_aggregator_simple_get_next_time:
3204 * @self: A #GstAggregator
3206 * This is a simple #GstAggregator::get_next_time implementation that
3207 * just looks at the #GstSegment on the srcpad of the aggregator and bases
3208 * the next time on the running time there.
3210 * This is the desired behaviour in most cases where you have a live source
3211 * and you have a dead line based aggregator subclass.
3213 * Returns: The running time based on the position
3218 gst_aggregator_simple_get_next_time (GstAggregator * self)
3220 GstClockTime next_time;
3221 GstAggregatorPad *srcpad = GST_AGGREGATOR_PAD (self->srcpad);
3222 GstSegment *segment = &srcpad->segment;
3224 GST_OBJECT_LOCK (self);
3225 if (segment->position == -1 || segment->position < segment->start)
3226 next_time = segment->start;
3228 next_time = segment->position;
3230 if (segment->stop != -1 && next_time > segment->stop)
3231 next_time = segment->stop;
3233 next_time = gst_segment_to_running_time (segment, GST_FORMAT_TIME, next_time);
3234 GST_OBJECT_UNLOCK (self);