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 * @short_description: manages a set of pads with the purpose of
25 * aggregating their buffers.
26 * @see_also: gstcollectpads for historical reasons.
28 * Manages a set of pads with the purpose of aggregating their buffers.
29 * 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.
36 * When data is queued on all pads, tha aggregate vmethod is called.
39 * One can peek at the data on any given GstAggregatorPad with the
40 * gst_aggregator_pad_get_buffer () method, and take ownership of it
41 * with the gst_aggregator_pad_steal_buffer () method. When a buffer
42 * has been taken with steal_buffer (), a new buffer can be queued
46 * If the subclass wishes to push a buffer downstream in its aggregate
47 * implementation, it should do so through the
48 * gst_aggregator_finish_buffer () method. This method will take care
49 * of sending and ordering mandatory events such as stream start, caps
53 * Same goes for EOS events, which should not be pushed directly by the
54 * subclass, it should instead return GST_FLOW_EOS in its aggregate
58 * Note that the aggregator logic regarding gap event handling is to turn
59 * these into gap buffers with matching PTS and duration. It will also
60 * flag these buffers with GST_BUFFER_FLAG_GAP and GST_BUFFER_FLAG_DROPPABLE
61 * to ease their identification and subsequent processing.
70 #include <string.h> /* strlen */
72 #include "gstaggregator.h"
76 GST_AGGREGATOR_START_TIME_SELECTION_ZERO,
77 GST_AGGREGATOR_START_TIME_SELECTION_FIRST,
78 GST_AGGREGATOR_START_TIME_SELECTION_SET
79 } GstAggregatorStartTimeSelection;
82 gst_aggregator_start_time_selection_get_type (void)
84 static GType gtype = 0;
87 static const GEnumValue values[] = {
88 {GST_AGGREGATOR_START_TIME_SELECTION_ZERO,
89 "Start at 0 running time (default)", "zero"},
90 {GST_AGGREGATOR_START_TIME_SELECTION_FIRST,
91 "Start at first observed input running time", "first"},
92 {GST_AGGREGATOR_START_TIME_SELECTION_SET,
93 "Set start time with start-time property", "set"},
97 gtype = g_enum_register_static ("GstAggregatorStartTimeSelection", values);
102 /* Might become API */
103 static void gst_aggregator_merge_tags (GstAggregator * aggregator,
104 const GstTagList * tags, GstTagMergeMode mode);
105 static void gst_aggregator_set_latency_property (GstAggregator * agg,
107 static gint64 gst_aggregator_get_latency_property (GstAggregator * agg);
110 /* Locking order, locks in this element must always be taken in this order
112 * standard sink pad stream lock -> GST_PAD_STREAM_LOCK (aggpad)
113 * Aggregator pad flush lock -> PAD_FLUSH_LOCK(aggpad)
114 * standard src pad stream lock -> GST_PAD_STREAM_LOCK (srcpad)
115 * Aggregator src lock -> SRC_LOCK(agg) w/ SRC_WAIT/BROADCAST
116 * standard element object lock -> GST_OBJECT_LOCK(agg)
117 * Aggregator pad lock -> PAD_LOCK (aggpad) w/ PAD_WAIT/BROADCAST_EVENT(aggpad)
118 * standard src pad object lock -> GST_OBJECT_LOCK(srcpad)
119 * standard sink pad object lock -> GST_OBJECT_LOCK(aggpad)
123 static GstClockTime gst_aggregator_get_latency_unlocked (GstAggregator * self);
125 GST_DEBUG_CATEGORY_STATIC (aggregator_debug);
126 #define GST_CAT_DEFAULT aggregator_debug
128 /* GstAggregatorPad definitions */
129 #define PAD_LOCK(pad) G_STMT_START { \
130 GST_TRACE_OBJECT (pad, "Taking PAD lock from thread %p", \
132 g_mutex_lock(&pad->priv->lock); \
133 GST_TRACE_OBJECT (pad, "Took PAD lock from thread %p", \
137 #define PAD_UNLOCK(pad) G_STMT_START { \
138 GST_TRACE_OBJECT (pad, "Releasing PAD lock from thread %p", \
140 g_mutex_unlock(&pad->priv->lock); \
141 GST_TRACE_OBJECT (pad, "Release PAD lock from thread %p", \
146 #define PAD_WAIT_EVENT(pad) G_STMT_START { \
147 GST_LOG_OBJECT (pad, "Waiting for buffer to be consumed thread %p", \
149 g_cond_wait(&(((GstAggregatorPad* )pad)->priv->event_cond), \
150 (&((GstAggregatorPad*)pad)->priv->lock)); \
151 GST_LOG_OBJECT (pad, "DONE Waiting for buffer to be consumed on thread %p", \
155 #define PAD_BROADCAST_EVENT(pad) G_STMT_START { \
156 GST_LOG_OBJECT (pad, "Signaling buffer consumed from thread %p", \
158 g_cond_broadcast(&(((GstAggregatorPad* )pad)->priv->event_cond)); \
162 #define PAD_FLUSH_LOCK(pad) G_STMT_START { \
163 GST_TRACE_OBJECT (pad, "Taking lock from thread %p", \
165 g_mutex_lock(&pad->priv->flush_lock); \
166 GST_TRACE_OBJECT (pad, "Took lock from thread %p", \
170 #define PAD_FLUSH_UNLOCK(pad) G_STMT_START { \
171 GST_TRACE_OBJECT (pad, "Releasing lock from thread %p", \
173 g_mutex_unlock(&pad->priv->flush_lock); \
174 GST_TRACE_OBJECT (pad, "Release lock from thread %p", \
178 #define SRC_LOCK(self) G_STMT_START { \
179 GST_TRACE_OBJECT (self, "Taking src lock from thread %p", \
181 g_mutex_lock(&self->priv->src_lock); \
182 GST_TRACE_OBJECT (self, "Took src lock from thread %p", \
186 #define SRC_UNLOCK(self) G_STMT_START { \
187 GST_TRACE_OBJECT (self, "Releasing src lock from thread %p", \
189 g_mutex_unlock(&self->priv->src_lock); \
190 GST_TRACE_OBJECT (self, "Released src lock from thread %p", \
194 #define SRC_WAIT(self) G_STMT_START { \
195 GST_LOG_OBJECT (self, "Waiting for src on thread %p", \
197 g_cond_wait(&(self->priv->src_cond), &(self->priv->src_lock)); \
198 GST_LOG_OBJECT (self, "DONE Waiting for src on thread %p", \
202 #define SRC_BROADCAST(self) G_STMT_START { \
203 GST_LOG_OBJECT (self, "Signaling src from thread %p", \
205 if (self->priv->aggregate_id) \
206 gst_clock_id_unschedule (self->priv->aggregate_id); \
207 g_cond_broadcast(&(self->priv->src_cond)); \
210 struct _GstAggregatorPadPrivate
212 /* Following fields are protected by the PAD_LOCK */
213 GstFlowReturn flow_return;
214 gboolean pending_flush_start;
215 gboolean pending_flush_stop;
216 gboolean pending_eos;
218 gboolean first_buffer;
222 GstClockTime head_position;
223 GstClockTime tail_position;
224 GstClockTime head_time;
225 GstClockTime tail_time;
226 GstClockTime time_level;
232 /* This lock prevents a flush start processing happening while
233 * the chain function is also happening.
239 gst_aggregator_pad_flush (GstAggregatorPad * aggpad, GstAggregator * agg)
241 GstAggregatorPadClass *klass = GST_AGGREGATOR_PAD_GET_CLASS (aggpad);
244 aggpad->priv->pending_eos = FALSE;
245 aggpad->priv->eos = FALSE;
246 aggpad->priv->flow_return = GST_FLOW_OK;
247 GST_OBJECT_LOCK (aggpad);
248 gst_segment_init (&aggpad->segment, GST_FORMAT_UNDEFINED);
249 gst_segment_init (&aggpad->clip_segment, GST_FORMAT_UNDEFINED);
250 GST_OBJECT_UNLOCK (aggpad);
251 aggpad->priv->head_position = GST_CLOCK_TIME_NONE;
252 aggpad->priv->tail_position = GST_CLOCK_TIME_NONE;
253 aggpad->priv->head_time = GST_CLOCK_TIME_NONE;
254 aggpad->priv->tail_time = GST_CLOCK_TIME_NONE;
255 aggpad->priv->time_level = 0;
259 return klass->flush (aggpad, agg);
264 /*************************************
265 * GstAggregator implementation *
266 *************************************/
267 static GstElementClass *aggregator_parent_class = NULL;
269 /* All members are protected by the object lock unless otherwise noted */
271 struct _GstAggregatorPrivate
275 /* Our state is >= PAUSED */
276 gboolean running; /* protected by src_lock */
279 gboolean send_stream_start; /* protected by srcpad stream lock */
280 gboolean send_segment;
281 gboolean flush_seeking;
282 gboolean pending_flush_start;
283 gboolean send_eos; /* protected by srcpad stream lock */
285 GstCaps *srccaps; /* protected by the srcpad stream lock */
288 gboolean tags_changed;
290 gboolean peer_latency_live; /* protected by src_lock */
291 GstClockTime peer_latency_min; /* protected by src_lock */
292 GstClockTime peer_latency_max; /* protected by src_lock */
293 gboolean has_peer_latency; /* protected by src_lock */
295 GstClockTime sub_latency_min; /* protected by src_lock */
296 GstClockTime sub_latency_max; /* protected by src_lock */
299 GstClockID aggregate_id; /* protected by src_lock */
303 gboolean first_buffer; /* protected by object lock */
304 GstAggregatorStartTimeSelection start_time_selection;
305 GstClockTime start_time;
308 gint64 latency; /* protected by both src_lock and all pad locks */
316 gboolean only_to_active_pads;
318 gboolean one_actually_seeked;
321 #define DEFAULT_LATENCY 0
322 #define DEFAULT_START_TIME_SELECTION GST_AGGREGATOR_START_TIME_SELECTION_ZERO
323 #define DEFAULT_START_TIME (-1)
329 PROP_START_TIME_SELECTION,
334 static GstFlowReturn gst_aggregator_pad_chain_internal (GstAggregator * self,
335 GstAggregatorPad * aggpad, GstBuffer * buffer, gboolean head);
338 * gst_aggregator_iterate_sinkpads:
339 * @self: The #GstAggregator
340 * @func: (scope call): The function to call.
341 * @user_data: (closure): The data to pass to @func.
343 * Iterate the sinkpads of aggregator to call a function on them.
345 * This method guarantees that @func will be called only once for each
349 gst_aggregator_iterate_sinkpads (GstAggregator * self,
350 GstAggregatorPadForeachFunc func, gpointer user_data)
352 gboolean result = FALSE;
354 gboolean done = FALSE;
355 GValue item = { 0, };
356 GList *seen_pads = NULL;
358 iter = gst_element_iterate_sink_pads (GST_ELEMENT (self));
364 switch (gst_iterator_next (iter, &item)) {
365 case GST_ITERATOR_OK:
367 GstAggregatorPad *pad;
369 pad = g_value_get_object (&item);
371 /* if already pushed, skip. FIXME, find something faster to tag pads */
372 if (pad == NULL || g_list_find (seen_pads, pad)) {
373 g_value_reset (&item);
377 GST_LOG_OBJECT (pad, "calling function %s on pad",
378 GST_DEBUG_FUNCPTR_NAME (func));
380 result = func (self, pad, user_data);
384 seen_pads = g_list_prepend (seen_pads, pad);
386 g_value_reset (&item);
389 case GST_ITERATOR_RESYNC:
390 gst_iterator_resync (iter);
392 case GST_ITERATOR_ERROR:
393 GST_ERROR_OBJECT (self,
394 "Could not iterate over internally linked pads");
397 case GST_ITERATOR_DONE:
402 g_value_unset (&item);
403 gst_iterator_free (iter);
405 if (seen_pads == NULL) {
406 GST_DEBUG_OBJECT (self, "No pad seen");
410 g_list_free (seen_pads);
417 gst_aggregator_pad_queue_is_empty (GstAggregatorPad * pad)
419 return (g_queue_peek_tail (&pad->priv->buffers) == NULL);
423 gst_aggregator_check_pads_ready (GstAggregator * self)
425 GstAggregatorPad *pad;
428 GST_LOG_OBJECT (self, "checking pads");
430 GST_OBJECT_LOCK (self);
432 sinkpads = GST_ELEMENT_CAST (self)->sinkpads;
433 if (sinkpads == NULL)
436 for (l = sinkpads; l != NULL; l = l->next) {
441 /* In live mode, having a single pad with buffers is enough to
442 * generate a start time from it. In non-live mode all pads need
445 if (self->priv->peer_latency_live &&
446 !gst_aggregator_pad_queue_is_empty (pad))
447 self->priv->first_buffer = FALSE;
449 if (gst_aggregator_pad_queue_is_empty (pad) && !pad->priv->eos) {
457 self->priv->first_buffer = FALSE;
459 GST_OBJECT_UNLOCK (self);
460 GST_LOG_OBJECT (self, "pads are ready");
465 GST_LOG_OBJECT (self, "pads not ready: no sink pads");
466 GST_OBJECT_UNLOCK (self);
471 GST_LOG_OBJECT (pad, "pad not ready to be aggregated yet");
472 GST_OBJECT_UNLOCK (self);
478 gst_aggregator_reset_flow_values (GstAggregator * self)
480 GST_OBJECT_LOCK (self);
481 self->priv->send_stream_start = TRUE;
482 self->priv->send_segment = TRUE;
483 gst_segment_init (&self->segment, GST_FORMAT_TIME);
484 self->priv->first_buffer = TRUE;
485 GST_OBJECT_UNLOCK (self);
489 gst_aggregator_push_mandatory_events (GstAggregator * self)
491 GstAggregatorPrivate *priv = self->priv;
492 GstEvent *segment = NULL;
493 GstEvent *tags = NULL;
495 if (self->priv->send_stream_start) {
498 GST_INFO_OBJECT (self, "pushing stream start");
499 /* stream-start (FIXME: create id based on input ids) */
500 g_snprintf (s_id, sizeof (s_id), "agg-%08x", g_random_int ());
501 if (!gst_pad_push_event (self->srcpad, gst_event_new_stream_start (s_id))) {
502 GST_WARNING_OBJECT (self->srcpad, "Sending stream start event failed");
504 self->priv->send_stream_start = FALSE;
507 if (self->priv->srccaps) {
509 GST_INFO_OBJECT (self, "pushing caps: %" GST_PTR_FORMAT,
510 self->priv->srccaps);
511 if (!gst_pad_push_event (self->srcpad,
512 gst_event_new_caps (self->priv->srccaps))) {
513 GST_WARNING_OBJECT (self->srcpad, "Sending caps event failed");
515 gst_caps_unref (self->priv->srccaps);
516 self->priv->srccaps = NULL;
519 GST_OBJECT_LOCK (self);
520 if (self->priv->send_segment && !self->priv->flush_seeking) {
521 segment = gst_event_new_segment (&self->segment);
523 if (!self->priv->seqnum)
524 self->priv->seqnum = gst_event_get_seqnum (segment);
526 gst_event_set_seqnum (segment, self->priv->seqnum);
527 self->priv->send_segment = FALSE;
529 GST_DEBUG_OBJECT (self, "pushing segment %" GST_PTR_FORMAT, segment);
532 if (priv->tags && priv->tags_changed && !self->priv->flush_seeking) {
533 tags = gst_event_new_tag (gst_tag_list_ref (priv->tags));
534 priv->tags_changed = FALSE;
536 GST_OBJECT_UNLOCK (self);
539 gst_pad_push_event (self->srcpad, segment);
541 gst_pad_push_event (self->srcpad, tags);
546 * gst_aggregator_set_src_caps:
547 * @self: The #GstAggregator
548 * @caps: The #GstCaps to set on the src pad.
550 * Sets the caps to be used on the src pad.
553 gst_aggregator_set_src_caps (GstAggregator * self, GstCaps * caps)
555 GST_PAD_STREAM_LOCK (self->srcpad);
556 gst_caps_replace (&self->priv->srccaps, caps);
557 gst_aggregator_push_mandatory_events (self);
558 GST_PAD_STREAM_UNLOCK (self->srcpad);
562 * gst_aggregator_finish_buffer:
563 * @self: The #GstAggregator
564 * @buffer: (transfer full): the #GstBuffer to push.
566 * This method will push the provided output buffer downstream. If needed,
567 * mandatory events such as stream-start, caps, and segment events will be
568 * sent before pushing the buffer.
571 gst_aggregator_finish_buffer (GstAggregator * self, GstBuffer * buffer)
573 gst_aggregator_push_mandatory_events (self);
575 GST_OBJECT_LOCK (self);
576 if (!self->priv->flush_seeking && gst_pad_is_active (self->srcpad)) {
577 GST_TRACE_OBJECT (self, "pushing buffer %" GST_PTR_FORMAT, buffer);
578 GST_OBJECT_UNLOCK (self);
579 return gst_pad_push (self->srcpad, buffer);
581 GST_INFO_OBJECT (self, "Not pushing (active: %i, flushing: %i)",
582 self->priv->flush_seeking, gst_pad_is_active (self->srcpad));
583 GST_OBJECT_UNLOCK (self);
584 gst_buffer_unref (buffer);
590 gst_aggregator_push_eos (GstAggregator * self)
593 gst_aggregator_push_mandatory_events (self);
595 event = gst_event_new_eos ();
597 GST_OBJECT_LOCK (self);
598 self->priv->send_eos = FALSE;
599 gst_event_set_seqnum (event, self->priv->seqnum);
600 GST_OBJECT_UNLOCK (self);
602 gst_pad_push_event (self->srcpad, event);
606 gst_aggregator_get_next_time (GstAggregator * self)
608 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (self);
610 if (klass->get_next_time)
611 return klass->get_next_time (self);
613 return GST_CLOCK_TIME_NONE;
617 gst_aggregator_wait_and_check (GstAggregator * self, gboolean * timeout)
619 GstClockTime latency;
627 latency = gst_aggregator_get_latency_unlocked (self);
629 if (gst_aggregator_check_pads_ready (self)) {
630 GST_DEBUG_OBJECT (self, "all pads have data");
636 /* Before waiting, check if we're actually still running */
637 if (!self->priv->running || !self->priv->send_eos) {
643 start = gst_aggregator_get_next_time (self);
645 /* If we're not live, or if we use the running time
646 * of the first buffer as start time, we wait until
647 * all pads have buffers.
648 * Otherwise (i.e. if we are live!), we wait on the clock
649 * and if a pad does not have a buffer in time we ignore
652 if (!GST_CLOCK_TIME_IS_VALID (latency) ||
653 !GST_IS_CLOCK (GST_ELEMENT_CLOCK (self)) ||
654 !GST_CLOCK_TIME_IS_VALID (start) ||
655 (self->priv->first_buffer
656 && self->priv->start_time_selection ==
657 GST_AGGREGATOR_START_TIME_SELECTION_FIRST)) {
658 /* We wake up here when something happened, and below
659 * then check if we're ready now. If we return FALSE,
660 * we will be directly called again.
664 GstClockTime base_time, time;
666 GstClockReturn status;
667 GstClockTimeDiff jitter;
669 GST_DEBUG_OBJECT (self, "got subclass start time: %" GST_TIME_FORMAT,
670 GST_TIME_ARGS (start));
672 GST_OBJECT_LOCK (self);
673 base_time = GST_ELEMENT_CAST (self)->base_time;
674 clock = GST_ELEMENT_CLOCK (self);
676 gst_object_ref (clock);
677 GST_OBJECT_UNLOCK (self);
679 time = base_time + start;
682 GST_DEBUG_OBJECT (self, "possibly waiting for clock to reach %"
683 GST_TIME_FORMAT " (base %" GST_TIME_FORMAT " start %" GST_TIME_FORMAT
684 " latency %" GST_TIME_FORMAT " current %" GST_TIME_FORMAT ")",
685 GST_TIME_ARGS (time),
686 GST_TIME_ARGS (GST_ELEMENT_CAST (self)->base_time),
687 GST_TIME_ARGS (start), GST_TIME_ARGS (latency),
688 GST_TIME_ARGS (gst_clock_get_time (clock)));
690 self->priv->aggregate_id = gst_clock_new_single_shot_id (clock, time);
691 gst_object_unref (clock);
695 status = gst_clock_id_wait (self->priv->aggregate_id, &jitter);
698 if (self->priv->aggregate_id) {
699 gst_clock_id_unref (self->priv->aggregate_id);
700 self->priv->aggregate_id = NULL;
703 GST_DEBUG_OBJECT (self,
704 "clock returned %d (jitter: %s%" GST_TIME_FORMAT ")",
705 status, (jitter < 0 ? "-" : " "),
706 GST_TIME_ARGS ((jitter < 0 ? -jitter : jitter)));
709 if (status == GST_CLOCK_OK || status == GST_CLOCK_EARLY) {
716 res = gst_aggregator_check_pads_ready (self);
723 check_events (GstAggregator * self, GstAggregatorPad * pad, gpointer user_data)
725 GstEvent *event = NULL;
726 GstAggregatorClass *klass = NULL;
727 gboolean *processed_event = user_data;
733 if (gst_aggregator_pad_queue_is_empty (pad) && pad->priv->pending_eos) {
734 pad->priv->pending_eos = FALSE;
735 pad->priv->eos = TRUE;
737 if (GST_IS_EVENT (g_queue_peek_tail (&pad->priv->buffers))) {
738 event = g_queue_pop_tail (&pad->priv->buffers);
739 PAD_BROADCAST_EVENT (pad);
744 *processed_event = TRUE;
746 klass = GST_AGGREGATOR_GET_CLASS (self);
748 GST_LOG_OBJECT (pad, "Processing %" GST_PTR_FORMAT, event);
749 klass->sink_event (self, pad, event);
751 } while (event != NULL);
757 gst_aggregator_pad_set_flushing (GstAggregatorPad * aggpad,
758 GstFlowReturn flow_return, gboolean full)
763 if (flow_return == GST_FLOW_NOT_LINKED)
764 aggpad->priv->flow_return = MIN (flow_return, aggpad->priv->flow_return);
766 aggpad->priv->flow_return = flow_return;
768 item = g_queue_peek_head_link (&aggpad->priv->buffers);
770 GList *next = item->next;
772 /* In partial flush, we do like the pad, we get rid of non-sticky events
775 if (full || GST_IS_BUFFER (item->data) ||
776 GST_EVENT_TYPE (item->data) == GST_EVENT_EOS ||
777 GST_EVENT_TYPE (item->data) == GST_EVENT_SEGMENT ||
778 !GST_EVENT_IS_STICKY (item->data)) {
779 gst_mini_object_unref (item->data);
780 g_queue_delete_link (&aggpad->priv->buffers, item);
784 aggpad->priv->num_buffers = 0;
786 PAD_BROADCAST_EVENT (aggpad);
791 gst_aggregator_aggregate_func (GstAggregator * self)
793 GstAggregatorPrivate *priv = self->priv;
794 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (self);
795 gboolean timeout = FALSE;
797 if (self->priv->running == FALSE) {
798 GST_DEBUG_OBJECT (self, "Not running anymore");
802 GST_LOG_OBJECT (self, "Checking aggregate");
803 while (priv->send_eos && priv->running) {
804 GstFlowReturn flow_return;
805 gboolean processed_event = FALSE;
807 gst_aggregator_iterate_sinkpads (self, check_events, NULL);
809 if (!gst_aggregator_wait_and_check (self, &timeout))
812 gst_aggregator_iterate_sinkpads (self, check_events, &processed_event);
816 GST_TRACE_OBJECT (self, "Actually aggregating!");
817 flow_return = klass->aggregate (self, timeout);
819 GST_OBJECT_LOCK (self);
820 if (flow_return == GST_FLOW_FLUSHING && priv->flush_seeking) {
821 /* We don't want to set the pads to flushing, but we want to
822 * stop the thread, so just break here */
823 GST_OBJECT_UNLOCK (self);
826 GST_OBJECT_UNLOCK (self);
828 if (flow_return == GST_FLOW_EOS || flow_return == GST_FLOW_ERROR) {
829 gst_aggregator_push_eos (self);
832 GST_LOG_OBJECT (self, "flow return is %s", gst_flow_get_name (flow_return));
834 if (flow_return != GST_FLOW_OK) {
837 GST_OBJECT_LOCK (self);
838 for (item = GST_ELEMENT (self)->sinkpads; item; item = item->next) {
839 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (item->data);
841 gst_aggregator_pad_set_flushing (aggpad, flow_return, TRUE);
843 GST_OBJECT_UNLOCK (self);
848 /* Pause the task here, the only ways to get here are:
849 * 1) We're stopping, in which case the task is stopped anyway
850 * 2) We got a flow error above, in which case it might take
851 * some time to forward the flow return upstream and we
852 * would otherwise call the task function over and over
853 * again without doing anything
855 gst_pad_pause_task (self->srcpad);
859 gst_aggregator_start (GstAggregator * self)
861 GstAggregatorClass *klass;
864 self->priv->running = TRUE;
865 self->priv->send_stream_start = TRUE;
866 self->priv->send_segment = TRUE;
867 self->priv->send_eos = TRUE;
868 self->priv->srccaps = NULL;
870 klass = GST_AGGREGATOR_GET_CLASS (self);
873 result = klass->start (self);
881 _check_pending_flush_stop (GstAggregatorPad * pad)
886 res = (!pad->priv->pending_flush_stop && !pad->priv->pending_flush_start);
893 gst_aggregator_stop_srcpad_task (GstAggregator * self, GstEvent * flush_start)
897 GST_INFO_OBJECT (self, "%s srcpad task",
898 flush_start ? "Pausing" : "Stopping");
901 self->priv->running = FALSE;
902 SRC_BROADCAST (self);
906 res = gst_pad_push_event (self->srcpad, flush_start);
909 gst_pad_stop_task (self->srcpad);
915 gst_aggregator_start_srcpad_task (GstAggregator * self)
917 GST_INFO_OBJECT (self, "Starting srcpad task");
919 self->priv->running = TRUE;
920 gst_pad_start_task (GST_PAD (self->srcpad),
921 (GstTaskFunction) gst_aggregator_aggregate_func, self, NULL);
925 gst_aggregator_flush (GstAggregator * self)
927 GstFlowReturn ret = GST_FLOW_OK;
928 GstAggregatorPrivate *priv = self->priv;
929 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (self);
931 GST_DEBUG_OBJECT (self, "Flushing everything");
932 GST_OBJECT_LOCK (self);
933 priv->send_segment = TRUE;
934 priv->flush_seeking = FALSE;
935 priv->tags_changed = FALSE;
936 GST_OBJECT_UNLOCK (self);
938 ret = klass->flush (self);
944 /* Called with GstAggregator's object lock held */
947 gst_aggregator_all_flush_stop_received_locked (GstAggregator * self)
950 GstAggregatorPad *tmppad;
952 for (tmp = GST_ELEMENT (self)->sinkpads; tmp; tmp = tmp->next) {
953 tmppad = (GstAggregatorPad *) tmp->data;
955 if (_check_pending_flush_stop (tmppad) == FALSE) {
956 GST_DEBUG_OBJECT (tmppad, "Is not last %i -- %i",
957 tmppad->priv->pending_flush_start, tmppad->priv->pending_flush_stop);
966 gst_aggregator_flush_start (GstAggregator * self, GstAggregatorPad * aggpad,
969 GstAggregatorPrivate *priv = self->priv;
970 GstAggregatorPadPrivate *padpriv = aggpad->priv;
972 gst_aggregator_pad_set_flushing (aggpad, GST_FLOW_FLUSHING, FALSE);
974 PAD_FLUSH_LOCK (aggpad);
976 if (padpriv->pending_flush_start) {
977 GST_DEBUG_OBJECT (aggpad, "Expecting FLUSH_STOP now");
979 padpriv->pending_flush_start = FALSE;
980 padpriv->pending_flush_stop = TRUE;
984 GST_OBJECT_LOCK (self);
985 if (priv->flush_seeking) {
986 /* If flush_seeking we forward the first FLUSH_START */
987 if (priv->pending_flush_start) {
988 priv->pending_flush_start = FALSE;
989 GST_OBJECT_UNLOCK (self);
991 GST_INFO_OBJECT (self, "Flushing, pausing srcpad task");
992 gst_aggregator_stop_srcpad_task (self, event);
994 GST_INFO_OBJECT (self, "Getting STREAM_LOCK while seeking");
995 GST_PAD_STREAM_LOCK (self->srcpad);
996 GST_LOG_OBJECT (self, "GOT STREAM_LOCK");
999 GST_OBJECT_UNLOCK (self);
1000 gst_event_unref (event);
1003 GST_OBJECT_UNLOCK (self);
1004 gst_event_unref (event);
1006 PAD_FLUSH_UNLOCK (aggpad);
1009 /* Must be called with the the PAD_LOCK held */
1011 update_time_level (GstAggregatorPad * aggpad, gboolean head)
1014 if (GST_CLOCK_TIME_IS_VALID (aggpad->priv->head_position) &&
1015 aggpad->clip_segment.format == GST_FORMAT_TIME)
1016 aggpad->priv->head_time =
1017 gst_segment_to_running_time (&aggpad->clip_segment,
1018 GST_FORMAT_TIME, aggpad->priv->head_position);
1020 aggpad->priv->head_time = GST_CLOCK_TIME_NONE;
1022 if (GST_CLOCK_TIME_IS_VALID (aggpad->priv->tail_position) &&
1023 aggpad->segment.format == GST_FORMAT_TIME)
1024 aggpad->priv->tail_time =
1025 gst_segment_to_running_time (&aggpad->segment,
1026 GST_FORMAT_TIME, aggpad->priv->tail_position);
1028 aggpad->priv->tail_time = aggpad->priv->head_time;
1031 if (aggpad->priv->head_time == GST_CLOCK_TIME_NONE ||
1032 aggpad->priv->tail_time == GST_CLOCK_TIME_NONE) {
1033 aggpad->priv->time_level = 0;
1037 if (aggpad->priv->tail_time > aggpad->priv->head_time)
1038 aggpad->priv->time_level = 0;
1040 aggpad->priv->time_level = aggpad->priv->head_time -
1041 aggpad->priv->tail_time;
1045 /* GstAggregator vmethods default implementations */
1047 gst_aggregator_default_sink_event (GstAggregator * self,
1048 GstAggregatorPad * aggpad, GstEvent * event)
1050 gboolean res = TRUE;
1051 GstPad *pad = GST_PAD (aggpad);
1052 GstAggregatorPrivate *priv = self->priv;
1054 switch (GST_EVENT_TYPE (event)) {
1055 case GST_EVENT_FLUSH_START:
1057 gst_aggregator_flush_start (self, aggpad, event);
1058 /* We forward only in one case: right after flush_seeking */
1062 case GST_EVENT_FLUSH_STOP:
1064 GST_DEBUG_OBJECT (aggpad, "Got FLUSH_STOP");
1066 gst_aggregator_pad_flush (aggpad, self);
1067 GST_OBJECT_LOCK (self);
1068 if (priv->flush_seeking) {
1069 g_atomic_int_set (&aggpad->priv->pending_flush_stop, FALSE);
1070 if (gst_aggregator_all_flush_stop_received_locked (self)) {
1071 GST_OBJECT_UNLOCK (self);
1072 /* That means we received FLUSH_STOP/FLUSH_STOP on
1073 * all sinkpads -- Seeking is Done... sending FLUSH_STOP */
1074 gst_aggregator_flush (self);
1075 gst_pad_push_event (self->srcpad, event);
1078 priv->send_eos = TRUE;
1079 SRC_BROADCAST (self);
1082 GST_INFO_OBJECT (self, "Releasing source pad STREAM_LOCK");
1083 GST_PAD_STREAM_UNLOCK (self->srcpad);
1084 gst_aggregator_start_srcpad_task (self);
1086 GST_OBJECT_UNLOCK (self);
1089 GST_OBJECT_UNLOCK (self);
1092 aggpad->priv->first_buffer = TRUE;
1094 /* We never forward the event */
1099 GST_DEBUG_OBJECT (aggpad, "EOS");
1101 /* We still have a buffer, and we don't want the subclass to have to
1102 * check for it. Mark pending_eos, eos will be set when steal_buffer is
1107 if (gst_aggregator_pad_queue_is_empty (aggpad)) {
1108 aggpad->priv->eos = TRUE;
1110 aggpad->priv->pending_eos = TRUE;
1112 PAD_UNLOCK (aggpad);
1114 SRC_BROADCAST (self);
1118 case GST_EVENT_SEGMENT:
1121 GST_OBJECT_LOCK (aggpad);
1122 gst_event_copy_segment (event, &aggpad->segment);
1123 update_time_level (aggpad, FALSE);
1124 GST_OBJECT_UNLOCK (aggpad);
1125 PAD_UNLOCK (aggpad);
1127 GST_OBJECT_LOCK (self);
1128 self->priv->seqnum = gst_event_get_seqnum (event);
1129 GST_OBJECT_UNLOCK (self);
1132 case GST_EVENT_STREAM_START:
1138 GstClockTime pts, endpts;
1139 GstClockTime duration;
1142 gst_event_parse_gap (event, &pts, &duration);
1143 gapbuf = gst_buffer_new ();
1145 if (GST_CLOCK_TIME_IS_VALID (duration))
1146 endpts = pts + duration;
1148 endpts = GST_CLOCK_TIME_NONE;
1150 GST_OBJECT_LOCK (aggpad);
1151 res = gst_segment_clip (&aggpad->segment, GST_FORMAT_TIME, pts, endpts,
1153 GST_OBJECT_UNLOCK (aggpad);
1156 GST_WARNING_OBJECT (self, "GAP event outside segment, dropping");
1160 if (GST_CLOCK_TIME_IS_VALID (endpts) && GST_CLOCK_TIME_IS_VALID (pts))
1161 duration = endpts - pts;
1163 duration = GST_CLOCK_TIME_NONE;
1165 GST_BUFFER_PTS (gapbuf) = pts;
1166 GST_BUFFER_DURATION (gapbuf) = duration;
1167 GST_BUFFER_FLAG_SET (gapbuf, GST_BUFFER_FLAG_GAP);
1168 GST_BUFFER_FLAG_SET (gapbuf, GST_BUFFER_FLAG_DROPPABLE);
1170 if (gst_aggregator_pad_chain_internal (self, aggpad, gapbuf, FALSE) !=
1172 GST_WARNING_OBJECT (self, "Failed to chain gap buffer");
1182 gst_event_parse_tag (event, &tags);
1184 if (gst_tag_list_get_scope (tags) == GST_TAG_SCOPE_STREAM) {
1185 gst_aggregator_merge_tags (self, tags, GST_TAG_MERGE_REPLACE);
1186 gst_event_unref (event);
1198 GST_DEBUG_OBJECT (pad, "Forwarding event: %" GST_PTR_FORMAT, event);
1199 return gst_pad_event_default (pad, GST_OBJECT (self), event);
1202 GST_DEBUG_OBJECT (pad, "Eating event: %" GST_PTR_FORMAT, event);
1204 gst_event_unref (event);
1209 static inline gboolean
1210 gst_aggregator_stop_pad (GstAggregator * self, GstAggregatorPad * pad,
1211 gpointer unused_udata)
1213 gst_aggregator_pad_flush (pad, self);
1219 gst_aggregator_stop (GstAggregator * agg)
1221 GstAggregatorClass *klass;
1224 gst_aggregator_reset_flow_values (agg);
1226 gst_aggregator_iterate_sinkpads (agg, gst_aggregator_stop_pad, NULL);
1228 klass = GST_AGGREGATOR_GET_CLASS (agg);
1231 result = klass->stop (agg);
1235 agg->priv->has_peer_latency = FALSE;
1236 agg->priv->peer_latency_live = FALSE;
1237 agg->priv->peer_latency_min = agg->priv->peer_latency_max = FALSE;
1239 if (agg->priv->tags)
1240 gst_tag_list_unref (agg->priv->tags);
1241 agg->priv->tags = NULL;
1246 /* GstElement vmethods implementations */
1247 static GstStateChangeReturn
1248 gst_aggregator_change_state (GstElement * element, GstStateChange transition)
1250 GstStateChangeReturn ret;
1251 GstAggregator *self = GST_AGGREGATOR (element);
1253 switch (transition) {
1254 case GST_STATE_CHANGE_READY_TO_PAUSED:
1255 if (!gst_aggregator_start (self))
1263 GST_ELEMENT_CLASS (aggregator_parent_class)->change_state (element,
1264 transition)) == GST_STATE_CHANGE_FAILURE)
1268 switch (transition) {
1269 case GST_STATE_CHANGE_PAUSED_TO_READY:
1270 if (!gst_aggregator_stop (self)) {
1271 /* What to do in this case? Error out? */
1272 GST_ERROR_OBJECT (self, "Subclass failed to stop.");
1284 GST_ERROR_OBJECT (element, "parent failed state change");
1289 GST_ERROR_OBJECT (element, "Subclass failed to start");
1290 return GST_STATE_CHANGE_FAILURE;
1295 gst_aggregator_release_pad (GstElement * element, GstPad * pad)
1297 GstAggregator *self = GST_AGGREGATOR (element);
1298 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
1300 GST_INFO_OBJECT (pad, "Removing pad");
1303 gst_aggregator_pad_set_flushing (aggpad, GST_FLOW_FLUSHING, TRUE);
1304 gst_element_remove_pad (element, pad);
1306 self->priv->has_peer_latency = FALSE;
1307 SRC_BROADCAST (self);
1311 static GstAggregatorPad *
1312 gst_aggregator_default_create_new_pad (GstAggregator * self,
1313 GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps)
1315 GstAggregatorPad *agg_pad;
1316 GstElementClass *klass = GST_ELEMENT_GET_CLASS (self);
1317 GstAggregatorPrivate *priv = self->priv;
1319 if (templ == gst_element_class_get_pad_template (klass, "sink_%u")) {
1323 GST_OBJECT_LOCK (self);
1324 if (req_name == NULL || strlen (req_name) < 6
1325 || !g_str_has_prefix (req_name, "sink_")) {
1326 /* no name given when requesting the pad, use next available int */
1329 /* parse serial number from requested padname */
1330 serial = g_ascii_strtoull (&req_name[5], NULL, 10);
1331 if (serial >= priv->padcount)
1332 priv->padcount = serial;
1335 name = g_strdup_printf ("sink_%u", priv->padcount);
1336 agg_pad = g_object_new (GST_AGGREGATOR_GET_CLASS (self)->sinkpads_type,
1337 "name", name, "direction", GST_PAD_SINK, "template", templ, NULL);
1340 GST_OBJECT_UNLOCK (self);
1349 gst_aggregator_request_new_pad (GstElement * element,
1350 GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps)
1352 GstAggregator *self;
1353 GstAggregatorPad *agg_pad;
1354 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (element);
1355 GstAggregatorPrivate *priv = GST_AGGREGATOR (element)->priv;
1357 self = GST_AGGREGATOR (element);
1359 agg_pad = klass->create_new_pad (self, templ, req_name, caps);
1361 GST_ERROR_OBJECT (element, "Couldn't create new pad");
1365 GST_DEBUG_OBJECT (element, "Adding pad %s", GST_PAD_NAME (agg_pad));
1366 self->priv->has_peer_latency = FALSE;
1369 gst_pad_set_active (GST_PAD (agg_pad), TRUE);
1371 /* add the pad to the element */
1372 gst_element_add_pad (element, GST_PAD (agg_pad));
1374 return GST_PAD (agg_pad);
1377 /* Must be called with SRC_LOCK held */
1380 gst_aggregator_query_latency_unlocked (GstAggregator * self, GstQuery * query)
1382 gboolean query_ret, live;
1383 GstClockTime our_latency, min, max;
1385 query_ret = gst_pad_query_default (self->srcpad, GST_OBJECT (self), query);
1388 GST_WARNING_OBJECT (self, "Latency query failed");
1392 gst_query_parse_latency (query, &live, &min, &max);
1394 our_latency = self->priv->latency;
1396 if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (min))) {
1397 GST_ERROR_OBJECT (self, "Invalid minimum latency %" GST_TIME_FORMAT
1398 ". Please file a bug at " PACKAGE_BUGREPORT ".", GST_TIME_ARGS (min));
1402 if (min > max && GST_CLOCK_TIME_IS_VALID (max)) {
1403 GST_ELEMENT_WARNING (self, CORE, CLOCK, (NULL),
1404 ("Impossible to configure latency: max %" GST_TIME_FORMAT " < min %"
1405 GST_TIME_FORMAT ". Add queues or other buffering elements.",
1406 GST_TIME_ARGS (max), GST_TIME_ARGS (min)));
1410 self->priv->peer_latency_live = live;
1411 self->priv->peer_latency_min = min;
1412 self->priv->peer_latency_max = max;
1413 self->priv->has_peer_latency = TRUE;
1417 min += self->priv->sub_latency_min;
1418 if (GST_CLOCK_TIME_IS_VALID (self->priv->sub_latency_max)
1419 && GST_CLOCK_TIME_IS_VALID (max))
1420 max += self->priv->sub_latency_max + our_latency;
1422 max = GST_CLOCK_TIME_NONE;
1424 SRC_BROADCAST (self);
1426 GST_DEBUG_OBJECT (self, "configured latency live:%s min:%" G_GINT64_FORMAT
1427 " max:%" G_GINT64_FORMAT, live ? "true" : "false", min, max);
1429 gst_query_set_latency (query, live, min, max);
1435 * MUST be called with the src_lock held.
1437 * See gst_aggregator_get_latency() for doc
1440 gst_aggregator_get_latency_unlocked (GstAggregator * self)
1442 GstClockTime latency;
1444 g_return_val_if_fail (GST_IS_AGGREGATOR (self), 0);
1446 if (!self->priv->has_peer_latency) {
1447 GstQuery *query = gst_query_new_latency ();
1450 ret = gst_aggregator_query_latency_unlocked (self, query);
1451 gst_query_unref (query);
1453 return GST_CLOCK_TIME_NONE;
1456 if (!self->priv->has_peer_latency || !self->priv->peer_latency_live)
1457 return GST_CLOCK_TIME_NONE;
1459 /* latency_min is never GST_CLOCK_TIME_NONE by construction */
1460 latency = self->priv->peer_latency_min;
1463 latency += self->priv->latency;
1464 latency += self->priv->sub_latency_min;
1470 * gst_aggregator_get_latency:
1471 * @self: a #GstAggregator
1473 * Retrieves the latency values reported by @self in response to the latency
1474 * query, or %GST_CLOCK_TIME_NONE if there is not live source connected and the element
1475 * will not wait for the clock.
1477 * Typically only called by subclasses.
1479 * Returns: The latency or %GST_CLOCK_TIME_NONE if the element does not sync
1482 gst_aggregator_get_latency (GstAggregator * self)
1487 ret = gst_aggregator_get_latency_unlocked (self);
1494 gst_aggregator_send_event (GstElement * element, GstEvent * event)
1496 GstAggregator *self = GST_AGGREGATOR (element);
1498 GST_STATE_LOCK (element);
1499 if (GST_EVENT_TYPE (event) == GST_EVENT_SEEK &&
1500 GST_STATE (element) < GST_STATE_PAUSED) {
1504 GstSeekType start_type, stop_type;
1507 gst_event_parse_seek (event, &rate, &fmt, &flags, &start_type,
1508 &start, &stop_type, &stop);
1510 GST_OBJECT_LOCK (self);
1511 gst_segment_do_seek (&self->segment, rate, fmt, flags, start_type, start,
1512 stop_type, stop, NULL);
1513 self->priv->seqnum = gst_event_get_seqnum (event);
1514 self->priv->first_buffer = FALSE;
1515 GST_OBJECT_UNLOCK (self);
1517 GST_DEBUG_OBJECT (element, "Storing segment %" GST_PTR_FORMAT, event);
1519 GST_STATE_UNLOCK (element);
1522 return GST_ELEMENT_CLASS (aggregator_parent_class)->send_event (element,
1527 gst_aggregator_default_src_query (GstAggregator * self, GstQuery * query)
1529 gboolean res = TRUE;
1531 switch (GST_QUERY_TYPE (query)) {
1532 case GST_QUERY_SEEKING:
1536 /* don't pass it along as some (file)sink might claim it does
1537 * whereas with a collectpads in between that will not likely work */
1538 gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
1539 gst_query_set_seeking (query, format, FALSE, 0, -1);
1544 case GST_QUERY_LATENCY:
1546 res = gst_aggregator_query_latency_unlocked (self, query);
1550 return gst_pad_query_default (self->srcpad, GST_OBJECT (self), query);
1557 gst_aggregator_event_forward_func (GstPad * pad, gpointer user_data)
1559 EventData *evdata = user_data;
1560 gboolean ret = TRUE;
1561 GstPad *peer = gst_pad_get_peer (pad);
1562 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
1565 if (evdata->only_to_active_pads && aggpad->priv->first_buffer) {
1566 GST_DEBUG_OBJECT (pad, "not sending event to inactive pad");
1569 ret = gst_pad_send_event (peer, gst_event_ref (evdata->event));
1570 GST_DEBUG_OBJECT (pad, "return of event push is %d", ret);
1571 gst_object_unref (peer);
1576 if (GST_EVENT_TYPE (evdata->event) == GST_EVENT_SEEK) {
1577 GstQuery *seeking = gst_query_new_seeking (GST_FORMAT_TIME);
1579 GST_DEBUG_OBJECT (pad, "Event %" GST_PTR_FORMAT " failed", evdata->event);
1581 if (gst_pad_query (peer, seeking)) {
1584 gst_query_parse_seeking (seeking, NULL, &seekable, NULL, NULL);
1586 if (seekable == FALSE) {
1587 GST_INFO_OBJECT (pad,
1588 "Source not seekable, We failed but it does not matter!");
1593 GST_ERROR_OBJECT (pad, "Query seeking FAILED");
1596 gst_query_unref (seeking);
1599 if (evdata->flush) {
1601 aggpad->priv->pending_flush_start = FALSE;
1602 aggpad->priv->pending_flush_stop = FALSE;
1603 PAD_UNLOCK (aggpad);
1606 evdata->one_actually_seeked = TRUE;
1609 evdata->result &= ret;
1611 /* Always send to all pads */
1616 gst_aggregator_forward_event_to_all_sinkpads (GstAggregator * self,
1617 GstEvent * event, gboolean flush, gboolean only_to_active_pads)
1621 evdata.event = event;
1622 evdata.result = TRUE;
1623 evdata.flush = flush;
1624 evdata.one_actually_seeked = FALSE;
1625 evdata.only_to_active_pads = only_to_active_pads;
1627 /* We first need to set all pads as flushing in a first pass
1628 * as flush_start flush_stop is sometimes sent synchronously
1629 * while we send the seek event */
1633 GST_OBJECT_LOCK (self);
1634 for (l = GST_ELEMENT_CAST (self)->sinkpads; l != NULL; l = l->next) {
1635 GstAggregatorPad *pad = l->data;
1638 pad->priv->pending_flush_start = TRUE;
1639 pad->priv->pending_flush_stop = FALSE;
1642 GST_OBJECT_UNLOCK (self);
1645 gst_pad_forward (self->srcpad, gst_aggregator_event_forward_func, &evdata);
1647 gst_event_unref (event);
1653 gst_aggregator_do_seek (GstAggregator * self, GstEvent * event)
1658 GstSeekType start_type, stop_type;
1662 GstAggregatorPrivate *priv = self->priv;
1664 gst_event_parse_seek (event, &rate, &fmt, &flags, &start_type,
1665 &start, &stop_type, &stop);
1667 GST_INFO_OBJECT (self, "starting SEEK");
1669 flush = flags & GST_SEEK_FLAG_FLUSH;
1671 GST_OBJECT_LOCK (self);
1673 priv->pending_flush_start = TRUE;
1674 priv->flush_seeking = TRUE;
1677 gst_segment_do_seek (&self->segment, rate, fmt, flags, start_type, start,
1678 stop_type, stop, NULL);
1680 /* Seeking sets a position */
1681 self->priv->first_buffer = FALSE;
1682 GST_OBJECT_UNLOCK (self);
1684 /* forward the seek upstream */
1686 gst_aggregator_forward_event_to_all_sinkpads (self, event, flush, FALSE);
1689 if (!evdata.result || !evdata.one_actually_seeked) {
1690 GST_OBJECT_LOCK (self);
1691 priv->flush_seeking = FALSE;
1692 priv->pending_flush_start = FALSE;
1693 GST_OBJECT_UNLOCK (self);
1696 GST_INFO_OBJECT (self, "seek done, result: %d", evdata.result);
1698 return evdata.result;
1702 gst_aggregator_default_src_event (GstAggregator * self, GstEvent * event)
1705 gboolean res = TRUE;
1707 switch (GST_EVENT_TYPE (event)) {
1708 case GST_EVENT_SEEK:
1710 gst_event_ref (event);
1711 res = gst_aggregator_do_seek (self, event);
1712 gst_event_unref (event);
1716 case GST_EVENT_NAVIGATION:
1718 /* navigation is rather pointless. */
1720 gst_event_unref (event);
1729 /* Don't forward QOS events to pads that had no active buffer yet. Otherwise
1730 * they will receive a QOS event that has earliest_time=0 (because we can't
1731 * have negative timestamps), and consider their buffer as too late */
1733 gst_aggregator_forward_event_to_all_sinkpads (self, event, FALSE,
1734 GST_EVENT_TYPE (event) == GST_EVENT_QOS);
1735 res = evdata.result;
1742 gst_aggregator_src_pad_event_func (GstPad * pad, GstObject * parent,
1745 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
1747 return klass->src_event (GST_AGGREGATOR (parent), event);
1751 gst_aggregator_src_pad_query_func (GstPad * pad, GstObject * parent,
1754 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
1756 return klass->src_query (GST_AGGREGATOR (parent), query);
1760 gst_aggregator_src_pad_activate_mode_func (GstPad * pad,
1761 GstObject * parent, GstPadMode mode, gboolean active)
1763 GstAggregator *self = GST_AGGREGATOR (parent);
1764 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
1766 if (klass->src_activate) {
1767 if (klass->src_activate (self, mode, active) == FALSE) {
1772 if (active == TRUE) {
1774 case GST_PAD_MODE_PUSH:
1776 GST_INFO_OBJECT (pad, "Activating pad!");
1777 gst_aggregator_start_srcpad_task (self);
1782 GST_ERROR_OBJECT (pad, "Only supported mode is PUSH");
1789 GST_INFO_OBJECT (self, "Deactivating srcpad");
1790 gst_aggregator_stop_srcpad_task (self, FALSE);
1796 gst_aggregator_default_sink_query (GstAggregator * self,
1797 GstAggregatorPad * aggpad, GstQuery * query)
1799 GstPad *pad = GST_PAD (aggpad);
1801 return gst_pad_query_default (pad, GST_OBJECT (self), query);
1805 gst_aggregator_finalize (GObject * object)
1807 GstAggregator *self = (GstAggregator *) object;
1809 g_mutex_clear (&self->priv->src_lock);
1810 g_cond_clear (&self->priv->src_cond);
1812 G_OBJECT_CLASS (aggregator_parent_class)->finalize (object);
1816 * gst_aggregator_set_latency_property:
1817 * @agg: a #GstAggregator
1818 * @latency: the new latency value (in nanoseconds).
1820 * Sets the new latency value to @latency. This value is used to limit the
1821 * amount of time a pad waits for data to appear before considering the pad
1825 gst_aggregator_set_latency_property (GstAggregator * self, gint64 latency)
1829 g_return_if_fail (GST_IS_AGGREGATOR (self));
1830 g_return_if_fail (GST_CLOCK_TIME_IS_VALID (latency));
1833 changed = (self->priv->latency != latency);
1838 GST_OBJECT_LOCK (self);
1839 /* First lock all the pads */
1840 for (item = GST_ELEMENT_CAST (self)->sinkpads; item; item = item->next) {
1841 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (item->data);
1845 self->priv->latency = latency;
1847 SRC_BROADCAST (self);
1849 /* Now wake up the pads */
1850 for (item = GST_ELEMENT_CAST (self)->sinkpads; item; item = item->next) {
1851 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (item->data);
1852 PAD_BROADCAST_EVENT (aggpad);
1853 PAD_UNLOCK (aggpad);
1855 GST_OBJECT_UNLOCK (self);
1861 gst_element_post_message (GST_ELEMENT_CAST (self),
1862 gst_message_new_latency (GST_OBJECT_CAST (self)));
1866 * gst_aggregator_get_latency_property:
1867 * @agg: a #GstAggregator
1869 * Gets the latency value. See gst_aggregator_set_latency for
1872 * Returns: The time in nanoseconds to wait for data to arrive on a sink pad
1873 * before a pad is deemed unresponsive. A value of -1 means an
1877 gst_aggregator_get_latency_property (GstAggregator * agg)
1881 g_return_val_if_fail (GST_IS_AGGREGATOR (agg), -1);
1883 GST_OBJECT_LOCK (agg);
1884 res = agg->priv->latency;
1885 GST_OBJECT_UNLOCK (agg);
1891 gst_aggregator_set_property (GObject * object, guint prop_id,
1892 const GValue * value, GParamSpec * pspec)
1894 GstAggregator *agg = GST_AGGREGATOR (object);
1898 gst_aggregator_set_latency_property (agg, g_value_get_int64 (value));
1900 case PROP_START_TIME_SELECTION:
1901 agg->priv->start_time_selection = g_value_get_enum (value);
1903 case PROP_START_TIME:
1904 agg->priv->start_time = g_value_get_uint64 (value);
1907 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1913 gst_aggregator_get_property (GObject * object, guint prop_id,
1914 GValue * value, GParamSpec * pspec)
1916 GstAggregator *agg = GST_AGGREGATOR (object);
1920 g_value_set_int64 (value, gst_aggregator_get_latency_property (agg));
1922 case PROP_START_TIME_SELECTION:
1923 g_value_set_enum (value, agg->priv->start_time_selection);
1925 case PROP_START_TIME:
1926 g_value_set_uint64 (value, agg->priv->start_time);
1929 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1934 /* GObject vmethods implementations */
1936 gst_aggregator_class_init (GstAggregatorClass * klass)
1938 GObjectClass *gobject_class = (GObjectClass *) klass;
1939 GstElementClass *gstelement_class = (GstElementClass *) klass;
1941 aggregator_parent_class = g_type_class_peek_parent (klass);
1942 g_type_class_add_private (klass, sizeof (GstAggregatorPrivate));
1944 GST_DEBUG_CATEGORY_INIT (aggregator_debug, "aggregator",
1945 GST_DEBUG_FG_MAGENTA, "GstAggregator");
1947 klass->sinkpads_type = GST_TYPE_AGGREGATOR_PAD;
1949 klass->sink_event = gst_aggregator_default_sink_event;
1950 klass->sink_query = gst_aggregator_default_sink_query;
1952 klass->src_event = gst_aggregator_default_src_event;
1953 klass->src_query = gst_aggregator_default_src_query;
1955 klass->create_new_pad = gst_aggregator_default_create_new_pad;
1957 gstelement_class->request_new_pad =
1958 GST_DEBUG_FUNCPTR (gst_aggregator_request_new_pad);
1959 gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_aggregator_send_event);
1960 gstelement_class->release_pad =
1961 GST_DEBUG_FUNCPTR (gst_aggregator_release_pad);
1962 gstelement_class->change_state =
1963 GST_DEBUG_FUNCPTR (gst_aggregator_change_state);
1965 gobject_class->set_property = gst_aggregator_set_property;
1966 gobject_class->get_property = gst_aggregator_get_property;
1967 gobject_class->finalize = gst_aggregator_finalize;
1969 g_object_class_install_property (gobject_class, PROP_LATENCY,
1970 g_param_spec_int64 ("latency", "Buffer latency",
1971 "Additional latency in live mode to allow upstream "
1972 "to take longer to produce buffers for the current "
1973 "position (in nanoseconds)", 0,
1974 (G_MAXLONG == G_MAXINT64) ? G_MAXINT64 : (G_MAXLONG * GST_SECOND - 1),
1975 DEFAULT_LATENCY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1977 g_object_class_install_property (gobject_class, PROP_START_TIME_SELECTION,
1978 g_param_spec_enum ("start-time-selection", "Start Time Selection",
1979 "Decides which start time is output",
1980 gst_aggregator_start_time_selection_get_type (),
1981 DEFAULT_START_TIME_SELECTION,
1982 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1984 g_object_class_install_property (gobject_class, PROP_START_TIME,
1985 g_param_spec_uint64 ("start-time", "Start Time",
1986 "Start time to use if start-time-selection=set", 0,
1988 DEFAULT_START_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1990 GST_DEBUG_REGISTER_FUNCPTR (gst_aggregator_stop_pad);
1994 gst_aggregator_init (GstAggregator * self, GstAggregatorClass * klass)
1996 GstPadTemplate *pad_template;
1997 GstAggregatorPrivate *priv;
1999 g_return_if_fail (klass->aggregate != NULL);
2002 G_TYPE_INSTANCE_GET_PRIVATE (self, GST_TYPE_AGGREGATOR,
2003 GstAggregatorPrivate);
2008 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (klass), "src");
2009 g_return_if_fail (pad_template != NULL);
2011 priv->padcount = -1;
2012 priv->tags_changed = FALSE;
2014 self->priv->peer_latency_live = FALSE;
2015 self->priv->peer_latency_min = self->priv->sub_latency_min = 0;
2016 self->priv->peer_latency_max = self->priv->sub_latency_max = 0;
2017 self->priv->has_peer_latency = FALSE;
2018 gst_aggregator_reset_flow_values (self);
2020 self->srcpad = gst_pad_new_from_template (pad_template, "src");
2022 gst_pad_set_event_function (self->srcpad,
2023 GST_DEBUG_FUNCPTR (gst_aggregator_src_pad_event_func));
2024 gst_pad_set_query_function (self->srcpad,
2025 GST_DEBUG_FUNCPTR (gst_aggregator_src_pad_query_func));
2026 gst_pad_set_activatemode_function (self->srcpad,
2027 GST_DEBUG_FUNCPTR (gst_aggregator_src_pad_activate_mode_func));
2029 gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
2031 self->priv->latency = DEFAULT_LATENCY;
2032 self->priv->start_time_selection = DEFAULT_START_TIME_SELECTION;
2033 self->priv->start_time = DEFAULT_START_TIME;
2035 g_mutex_init (&self->priv->src_lock);
2036 g_cond_init (&self->priv->src_cond);
2039 /* we can't use G_DEFINE_ABSTRACT_TYPE because we need the klass in the _init
2040 * method to get to the padtemplates */
2042 gst_aggregator_get_type (void)
2044 static volatile gsize type = 0;
2046 if (g_once_init_enter (&type)) {
2048 static const GTypeInfo info = {
2049 sizeof (GstAggregatorClass),
2052 (GClassInitFunc) gst_aggregator_class_init,
2055 sizeof (GstAggregator),
2057 (GInstanceInitFunc) gst_aggregator_init,
2060 _type = g_type_register_static (GST_TYPE_ELEMENT,
2061 "GstAggregator", &info, G_TYPE_FLAG_ABSTRACT);
2062 g_once_init_leave (&type, _type);
2067 /* Must be called with SRC lock and PAD lock held */
2069 gst_aggregator_pad_has_space (GstAggregator * self, GstAggregatorPad * aggpad)
2071 /* Empty queue always has space */
2072 if (g_queue_get_length (&aggpad->priv->buffers) == 0)
2075 /* We also want at least two buffers, one is being processed and one is ready
2076 * for the next iteration when we operate in live mode. */
2077 if (self->priv->peer_latency_live && aggpad->priv->num_buffers < 2)
2080 /* zero latency, if there is a buffer, it's full */
2081 if (self->priv->latency == 0)
2084 /* Allow no more buffers than the latency */
2085 return (aggpad->priv->time_level <= self->priv->latency);
2088 /* Must be called with the PAD_LOCK held */
2090 apply_buffer (GstAggregatorPad * aggpad, GstBuffer * buffer, gboolean head)
2092 GstClockTime timestamp;
2094 if (GST_BUFFER_DTS_IS_VALID (buffer))
2095 timestamp = GST_BUFFER_DTS (buffer);
2097 timestamp = GST_BUFFER_PTS (buffer);
2099 if (timestamp == GST_CLOCK_TIME_NONE) {
2101 timestamp = aggpad->priv->head_position;
2103 timestamp = aggpad->priv->tail_position;
2107 if (GST_BUFFER_DURATION_IS_VALID (buffer))
2108 timestamp += GST_BUFFER_DURATION (buffer);
2111 aggpad->priv->head_position = timestamp;
2113 aggpad->priv->tail_position = timestamp;
2115 update_time_level (aggpad, head);
2118 static GstFlowReturn
2119 gst_aggregator_pad_chain_internal (GstAggregator * self,
2120 GstAggregatorPad * aggpad, GstBuffer * buffer, gboolean head)
2122 GstBuffer *actual_buf = buffer;
2123 GstAggregatorClass *aggclass = GST_AGGREGATOR_GET_CLASS (self);
2124 GstFlowReturn flow_return;
2125 GstClockTime buf_pts;
2127 GST_DEBUG_OBJECT (aggpad, "Start chaining a buffer %" GST_PTR_FORMAT, buffer);
2129 PAD_FLUSH_LOCK (aggpad);
2132 flow_return = aggpad->priv->flow_return;
2133 if (flow_return != GST_FLOW_OK)
2136 if (aggpad->priv->pending_eos == TRUE)
2139 flow_return = aggpad->priv->flow_return;
2140 if (flow_return != GST_FLOW_OK)
2143 PAD_UNLOCK (aggpad);
2145 if (aggclass->clip && head) {
2146 aggclass->clip (self, aggpad, buffer, &actual_buf);
2149 if (actual_buf == NULL) {
2150 GST_LOG_OBJECT (actual_buf, "Buffer dropped by clip function");
2154 buf_pts = GST_BUFFER_PTS (actual_buf);
2156 aggpad->priv->first_buffer = FALSE;
2160 GST_OBJECT_LOCK (self);
2162 if (gst_aggregator_pad_has_space (self, aggpad)
2163 && aggpad->priv->flow_return == GST_FLOW_OK) {
2165 g_queue_push_head (&aggpad->priv->buffers, actual_buf);
2167 g_queue_push_tail (&aggpad->priv->buffers, actual_buf);
2168 apply_buffer (aggpad, actual_buf, head);
2169 aggpad->priv->num_buffers++;
2170 actual_buf = buffer = NULL;
2171 SRC_BROADCAST (self);
2175 flow_return = aggpad->priv->flow_return;
2176 if (flow_return != GST_FLOW_OK) {
2177 GST_OBJECT_UNLOCK (self);
2181 GST_DEBUG_OBJECT (aggpad, "Waiting for buffer to be consumed");
2182 GST_OBJECT_UNLOCK (self);
2184 PAD_WAIT_EVENT (aggpad);
2186 PAD_UNLOCK (aggpad);
2189 if (self->priv->first_buffer) {
2190 GstClockTime start_time;
2192 switch (self->priv->start_time_selection) {
2193 case GST_AGGREGATOR_START_TIME_SELECTION_ZERO:
2197 case GST_AGGREGATOR_START_TIME_SELECTION_FIRST:
2198 GST_OBJECT_LOCK (aggpad);
2199 if (aggpad->segment.format == GST_FORMAT_TIME) {
2200 start_time = buf_pts;
2201 if (start_time != -1) {
2202 start_time = MAX (start_time, aggpad->segment.start);
2204 gst_segment_to_running_time (&aggpad->segment, GST_FORMAT_TIME,
2209 GST_WARNING_OBJECT (aggpad,
2210 "Ignoring request of selecting the first start time "
2211 "as the segment is a %s segment instead of a time segment",
2212 gst_format_get_name (aggpad->segment.format));
2214 GST_OBJECT_UNLOCK (aggpad);
2216 case GST_AGGREGATOR_START_TIME_SELECTION_SET:
2217 start_time = self->priv->start_time;
2218 if (start_time == -1)
2223 if (start_time != -1) {
2224 if (self->segment.position == -1)
2225 self->segment.position = start_time;
2227 self->segment.position = MIN (start_time, self->segment.position);
2229 GST_DEBUG_OBJECT (self, "Selecting start time %" GST_TIME_FORMAT,
2230 GST_TIME_ARGS (start_time));
2234 PAD_UNLOCK (aggpad);
2235 GST_OBJECT_UNLOCK (self);
2240 PAD_FLUSH_UNLOCK (aggpad);
2242 GST_DEBUG_OBJECT (aggpad, "Done chaining");
2247 PAD_UNLOCK (aggpad);
2248 PAD_FLUSH_UNLOCK (aggpad);
2250 GST_DEBUG_OBJECT (aggpad, "Pad is %s, dropping buffer",
2251 gst_flow_get_name (flow_return));
2253 gst_buffer_unref (buffer);
2258 PAD_UNLOCK (aggpad);
2259 PAD_FLUSH_UNLOCK (aggpad);
2261 gst_buffer_unref (buffer);
2262 GST_DEBUG_OBJECT (aggpad, "We are EOS already...");
2264 return GST_FLOW_EOS;
2267 static GstFlowReturn
2268 gst_aggregator_pad_chain (GstPad * pad, GstObject * object, GstBuffer * buffer)
2270 return gst_aggregator_pad_chain_internal (GST_AGGREGATOR_CAST (object),
2271 GST_AGGREGATOR_PAD_CAST (pad), buffer, TRUE);
2275 gst_aggregator_pad_query_func (GstPad * pad, GstObject * parent,
2278 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
2279 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
2281 if (GST_QUERY_IS_SERIALIZED (query)) {
2284 while (!gst_aggregator_pad_queue_is_empty (aggpad)
2285 && aggpad->priv->flow_return == GST_FLOW_OK) {
2286 GST_DEBUG_OBJECT (aggpad, "Waiting for buffer to be consumed");
2287 PAD_WAIT_EVENT (aggpad);
2290 if (aggpad->priv->flow_return != GST_FLOW_OK)
2293 PAD_UNLOCK (aggpad);
2296 return klass->sink_query (GST_AGGREGATOR (parent),
2297 GST_AGGREGATOR_PAD (pad), query);
2300 GST_DEBUG_OBJECT (aggpad, "Pad is %s, dropping query",
2301 gst_flow_get_name (aggpad->priv->flow_return));
2302 PAD_UNLOCK (aggpad);
2307 gst_aggregator_pad_event_func (GstPad * pad, GstObject * parent,
2310 GstAggregator *self = GST_AGGREGATOR (parent);
2311 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
2312 GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (parent);
2314 if (GST_EVENT_IS_SERIALIZED (event) && GST_EVENT_TYPE (event) != GST_EVENT_EOS
2315 /* && GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT_DONE */ ) {
2319 if (aggpad->priv->flow_return != GST_FLOW_OK
2320 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP)
2323 if (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
2324 GST_OBJECT_LOCK (aggpad);
2325 gst_event_copy_segment (event, &aggpad->clip_segment);
2326 aggpad->priv->head_position = aggpad->clip_segment.position;
2327 update_time_level (aggpad, TRUE);
2328 GST_OBJECT_UNLOCK (aggpad);
2331 if (!gst_aggregator_pad_queue_is_empty (aggpad) &&
2332 GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) {
2333 GST_DEBUG_OBJECT (aggpad, "Store event in queue: %" GST_PTR_FORMAT,
2335 g_queue_push_head (&aggpad->priv->buffers, event);
2337 SRC_BROADCAST (self);
2339 PAD_UNLOCK (aggpad);
2344 return klass->sink_event (self, aggpad, event);
2349 GST_DEBUG_OBJECT (aggpad, "Pad is %s, dropping event",
2350 gst_flow_get_name (aggpad->priv->flow_return));
2351 PAD_UNLOCK (aggpad);
2353 if (GST_EVENT_IS_STICKY (event))
2354 gst_pad_store_sticky_event (pad, event);
2355 gst_event_unref (event);
2360 gst_aggregator_pad_activate_mode_func (GstPad * pad,
2361 GstObject * parent, GstPadMode mode, gboolean active)
2363 GstAggregator *self = GST_AGGREGATOR (parent);
2364 GstAggregatorPad *aggpad = GST_AGGREGATOR_PAD (pad);
2366 if (active == FALSE) {
2368 gst_aggregator_pad_set_flushing (aggpad, GST_FLOW_FLUSHING, TRUE);
2369 SRC_BROADCAST (self);
2373 aggpad->priv->flow_return = GST_FLOW_OK;
2374 PAD_BROADCAST_EVENT (aggpad);
2375 PAD_UNLOCK (aggpad);
2381 /***********************************
2382 * GstAggregatorPad implementation *
2383 ************************************/
2384 G_DEFINE_TYPE (GstAggregatorPad, gst_aggregator_pad, GST_TYPE_PAD);
2387 gst_aggregator_pad_constructed (GObject * object)
2389 GstPad *pad = GST_PAD (object);
2391 gst_pad_set_chain_function (pad,
2392 GST_DEBUG_FUNCPTR (gst_aggregator_pad_chain));
2393 gst_pad_set_event_function (pad,
2394 GST_DEBUG_FUNCPTR (gst_aggregator_pad_event_func));
2395 gst_pad_set_query_function (pad,
2396 GST_DEBUG_FUNCPTR (gst_aggregator_pad_query_func));
2397 gst_pad_set_activatemode_function (pad,
2398 GST_DEBUG_FUNCPTR (gst_aggregator_pad_activate_mode_func));
2402 gst_aggregator_pad_finalize (GObject * object)
2404 GstAggregatorPad *pad = (GstAggregatorPad *) object;
2406 g_cond_clear (&pad->priv->event_cond);
2407 g_mutex_clear (&pad->priv->flush_lock);
2408 g_mutex_clear (&pad->priv->lock);
2410 G_OBJECT_CLASS (gst_aggregator_pad_parent_class)->finalize (object);
2414 gst_aggregator_pad_dispose (GObject * object)
2416 GstAggregatorPad *pad = (GstAggregatorPad *) object;
2418 gst_aggregator_pad_set_flushing (pad, GST_FLOW_FLUSHING, TRUE);
2420 G_OBJECT_CLASS (gst_aggregator_pad_parent_class)->dispose (object);
2424 gst_aggregator_pad_class_init (GstAggregatorPadClass * klass)
2426 GObjectClass *gobject_class = (GObjectClass *) klass;
2428 g_type_class_add_private (klass, sizeof (GstAggregatorPadPrivate));
2430 gobject_class->constructed = gst_aggregator_pad_constructed;
2431 gobject_class->finalize = gst_aggregator_pad_finalize;
2432 gobject_class->dispose = gst_aggregator_pad_dispose;
2436 gst_aggregator_pad_init (GstAggregatorPad * pad)
2439 G_TYPE_INSTANCE_GET_PRIVATE (pad, GST_TYPE_AGGREGATOR_PAD,
2440 GstAggregatorPadPrivate);
2442 g_queue_init (&pad->priv->buffers);
2443 g_cond_init (&pad->priv->event_cond);
2445 g_mutex_init (&pad->priv->flush_lock);
2446 g_mutex_init (&pad->priv->lock);
2448 pad->priv->first_buffer = TRUE;
2452 * gst_aggregator_pad_steal_buffer:
2453 * @pad: the pad to get buffer from
2455 * Steal the ref to the buffer currently queued in @pad.
2457 * Returns: (transfer full): The buffer in @pad or NULL if no buffer was
2458 * queued. You should unref the buffer after usage.
2461 gst_aggregator_pad_steal_buffer (GstAggregatorPad * pad)
2463 GstBuffer *buffer = NULL;
2466 if (GST_IS_BUFFER (g_queue_peek_tail (&pad->priv->buffers)))
2467 buffer = g_queue_pop_tail (&pad->priv->buffers);
2470 apply_buffer (pad, buffer, FALSE);
2471 pad->priv->num_buffers--;
2472 GST_TRACE_OBJECT (pad, "Consuming buffer");
2473 if (gst_aggregator_pad_queue_is_empty (pad) && pad->priv->pending_eos) {
2474 pad->priv->pending_eos = FALSE;
2475 pad->priv->eos = TRUE;
2477 PAD_BROADCAST_EVENT (pad);
2478 GST_DEBUG_OBJECT (pad, "Consumed: %" GST_PTR_FORMAT, buffer);
2486 * gst_aggregator_pad_drop_buffer:
2487 * @pad: the pad where to drop any pending buffer
2489 * Drop the buffer currently queued in @pad.
2491 * Returns: TRUE if there was a buffer queued in @pad, or FALSE if not.
2494 gst_aggregator_pad_drop_buffer (GstAggregatorPad * pad)
2498 buf = gst_aggregator_pad_steal_buffer (pad);
2503 gst_buffer_unref (buf);
2508 * gst_aggregator_pad_get_buffer:
2509 * @pad: the pad to get buffer from
2511 * Returns: (transfer full): A reference to the buffer in @pad or
2512 * NULL if no buffer was queued. You should unref the buffer after
2516 gst_aggregator_pad_get_buffer (GstAggregatorPad * pad)
2518 GstBuffer *buffer = NULL;
2521 buffer = g_queue_peek_tail (&pad->priv->buffers);
2522 /* The tail should always be a buffer, because if it is an event,
2523 * it will be consumed immeditaly in gst_aggregator_steal_buffer */
2525 if (GST_IS_BUFFER (buffer))
2526 gst_buffer_ref (buffer);
2535 gst_aggregator_pad_is_eos (GstAggregatorPad * pad)
2540 is_eos = pad->priv->eos;
2547 * gst_aggregator_merge_tags:
2548 * @self: a #GstAggregator
2549 * @tags: a #GstTagList to merge
2550 * @mode: the #GstTagMergeMode to use
2552 * Adds tags to so-called pending tags, which will be processed
2553 * before pushing out data downstream.
2555 * Note that this is provided for convenience, and the subclass is
2556 * not required to use this and can still do tag handling on its own.
2561 gst_aggregator_merge_tags (GstAggregator * self,
2562 const GstTagList * tags, GstTagMergeMode mode)
2566 g_return_if_fail (GST_IS_AGGREGATOR (self));
2567 g_return_if_fail (tags == NULL || GST_IS_TAG_LIST (tags));
2569 /* FIXME Check if we can use OBJECT lock here! */
2570 GST_OBJECT_LOCK (self);
2572 GST_DEBUG_OBJECT (self, "merging tags %" GST_PTR_FORMAT, tags);
2573 otags = self->priv->tags;
2574 self->priv->tags = gst_tag_list_merge (self->priv->tags, tags, mode);
2576 gst_tag_list_unref (otags);
2577 self->priv->tags_changed = TRUE;
2578 GST_OBJECT_UNLOCK (self);
2582 * gst_aggregator_set_latency:
2583 * @self: a #GstAggregator
2584 * @min_latency: minimum latency
2585 * @max_latency: maximum latency
2587 * Lets #GstAggregator sub-classes tell the baseclass what their internal
2588 * latency is. Will also post a LATENCY message on the bus so the pipeline
2589 * can reconfigure its global latency.
2592 gst_aggregator_set_latency (GstAggregator * self,
2593 GstClockTime min_latency, GstClockTime max_latency)
2595 gboolean changed = FALSE;
2597 g_return_if_fail (GST_IS_AGGREGATOR (self));
2598 g_return_if_fail (GST_CLOCK_TIME_IS_VALID (min_latency));
2599 g_return_if_fail (max_latency >= min_latency);
2602 if (self->priv->sub_latency_min != min_latency) {
2603 self->priv->sub_latency_min = min_latency;
2606 if (self->priv->sub_latency_max != max_latency) {
2607 self->priv->sub_latency_max = max_latency;
2612 SRC_BROADCAST (self);
2616 gst_element_post_message (GST_ELEMENT_CAST (self),
2617 gst_message_new_latency (GST_OBJECT_CAST (self)));