1 /* GStreamer input selector
2 * Copyright (C) 2003 Julien Moutte <julien@moutte.net>
3 * Copyright (C) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
4 * Copyright (C) 2005 Jan Schmidt <thaytan@mad.scientist.com>
5 * Copyright (C) 2007 Wim Taymans <wim.taymans@gmail.com>
6 * Copyright (C) 2007 Andy Wingo <wingo@pobox.com>
7 * Copyright (C) 2008 Nokia Corporation. (contact <stefan.kost@nokia.com>)
8 * Copyright (C) 2011 Sebastian Dröge <sebastian.droege@collabora.co.uk>
10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Library General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Library General Public License for more details.
20 * You should have received a copy of the GNU Library General Public
21 * License along with this library; if not, write to the
22 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
23 * Boston, MA 02110-1301, USA.
27 * SECTION:element-input-selector
28 * @see_also: #GstOutputSelector
30 * Direct one out of N input streams to the output pad.
32 * The input pads are from a GstPad subclass and have additional
33 * properties, which users may find useful, namely:
37 * "running-time": Running time of stream on pad (#gint64)
40 * "tags": The currently active tags on the pad (#GstTagList, boxed type)
43 * "active": If the pad is currently active (#gboolean)
46 * "always-ok" : Make an inactive pads return #GST_FLOW_OK instead of
47 * #GST_FLOW_NOT_LINKED
58 #include "gstinputselector.h"
60 #define DEBUG_CACHED_BUFFERS 0
62 GST_DEBUG_CATEGORY_STATIC (input_selector_debug);
63 #define GST_CAT_DEFAULT input_selector_debug
65 #define GST_TYPE_INPUT_SELECTOR_SYNC_MODE (gst_input_selector_sync_mode_get_type())
67 gst_input_selector_sync_mode_get_type (void)
69 static GType type = 0;
70 static const GEnumValue data[] = {
71 {GST_INPUT_SELECTOR_SYNC_MODE_ACTIVE_SEGMENT,
72 "Sync using the current active segment",
74 {GST_INPUT_SELECTOR_SYNC_MODE_CLOCK, "Sync using the clock", "clock"},
79 type = g_enum_register_static ("GstInputSelectorSyncMode", data);
84 #define GST_INPUT_SELECTOR_GET_LOCK(sel) (&((GstInputSelector*)(sel))->lock)
85 #define GST_INPUT_SELECTOR_GET_COND(sel) (&((GstInputSelector*)(sel))->cond)
86 #define GST_INPUT_SELECTOR_LOCK(sel) (g_mutex_lock (GST_INPUT_SELECTOR_GET_LOCK(sel)))
87 #define GST_INPUT_SELECTOR_UNLOCK(sel) (g_mutex_unlock (GST_INPUT_SELECTOR_GET_LOCK(sel)))
88 #define GST_INPUT_SELECTOR_WAIT(sel) (g_cond_wait (GST_INPUT_SELECTOR_GET_COND(sel), \
89 GST_INPUT_SELECTOR_GET_LOCK(sel)))
90 #define GST_INPUT_SELECTOR_BROADCAST(sel) (g_cond_broadcast (GST_INPUT_SELECTOR_GET_COND(sel)))
92 static GstStaticPadTemplate gst_input_selector_sink_factory =
93 GST_STATIC_PAD_TEMPLATE ("sink_%u",
98 static GstStaticPadTemplate gst_input_selector_src_factory =
99 GST_STATIC_PAD_TEMPLATE ("src",
102 GST_STATIC_CAPS_ANY);
114 #define DEFAULT_SYNC_STREAMS TRUE
115 #define DEFAULT_SYNC_MODE GST_INPUT_SELECTOR_SYNC_MODE_ACTIVE_SEGMENT
116 #define DEFAULT_CACHE_BUFFERS FALSE
117 #define DEFAULT_PAD_ALWAYS_OK TRUE
122 PROP_PAD_RUNNING_TIME,
135 static guint gst_input_selector_signals[LAST_SIGNAL] = { 0 };
137 static void gst_input_selector_active_pad_changed (GstInputSelector * sel,
138 GParamSpec * pspec, gpointer user_data);
139 static inline gboolean gst_input_selector_is_active_sinkpad (GstInputSelector *
141 static GstPad *gst_input_selector_activate_sinkpad (GstInputSelector * sel,
143 static GstPad *gst_input_selector_get_linked_pad (GstInputSelector * sel,
144 GstPad * pad, gboolean strict);
146 #define GST_TYPE_SELECTOR_PAD \
147 (gst_selector_pad_get_type())
148 #define GST_SELECTOR_PAD(obj) \
149 (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_SELECTOR_PAD, GstSelectorPad))
150 #define GST_SELECTOR_PAD_CLASS(klass) \
151 (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_SELECTOR_PAD, GstSelectorPadClass))
152 #define GST_IS_SELECTOR_PAD(obj) \
153 (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_SELECTOR_PAD))
154 #define GST_IS_SELECTOR_PAD_CLASS(klass) \
155 (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_SELECTOR_PAD))
156 #define GST_SELECTOR_PAD_CAST(obj) \
157 ((GstSelectorPad *)(obj))
159 typedef struct _GstSelectorPad GstSelectorPad;
160 typedef struct _GstSelectorPadClass GstSelectorPadClass;
161 typedef struct _GstSelectorPadCachedBuffer GstSelectorPadCachedBuffer;
163 struct _GstSelectorPad
167 gboolean active; /* when buffer have passed the pad */
168 gboolean pushed; /* when buffer was pushed downstream since activation */
169 gboolean eos; /* when EOS has been received */
170 gboolean eos_sent; /* when EOS was sent downstream */
171 gboolean discont; /* after switching we create a discont */
172 gboolean flushing; /* set after flush-start and before flush-stop */
174 GstTagList *tags; /* last tags received on the pad */
176 GstSegment segment; /* the current segment on the pad */
177 guint32 segment_seqnum; /* sequence number of the current segment */
179 gboolean events_pending; /* TRUE if sticky events need to be updated */
181 gboolean sending_cached_buffers;
182 GQueue *cached_buffers;
185 struct _GstSelectorPadCachedBuffer
191 struct _GstSelectorPadClass
196 GType gst_selector_pad_get_type (void);
197 static void gst_selector_pad_finalize (GObject * object);
198 static void gst_selector_pad_get_property (GObject * object,
199 guint prop_id, GValue * value, GParamSpec * pspec);
200 static void gst_selector_pad_set_property (GObject * object,
201 guint prop_id, const GValue * value, GParamSpec * pspec);
203 static gint64 gst_selector_pad_get_running_time (GstSelectorPad * pad);
204 static void gst_selector_pad_reset (GstSelectorPad * pad);
205 static gboolean gst_selector_pad_event (GstPad * pad, GstObject * parent,
207 static gboolean gst_selector_pad_query (GstPad * pad, GstObject * parent,
209 static GstIterator *gst_selector_pad_iterate_linked_pads (GstPad * pad,
211 static GstFlowReturn gst_selector_pad_chain (GstPad * pad, GstObject * parent,
213 static void gst_selector_pad_cache_buffer (GstSelectorPad * selpad,
215 static void gst_selector_pad_free_cached_buffers (GstSelectorPad * selpad);
217 G_DEFINE_TYPE (GstSelectorPad, gst_selector_pad, GST_TYPE_PAD);
220 gst_selector_pad_class_init (GstSelectorPadClass * klass)
222 GObjectClass *gobject_class;
224 gobject_class = (GObjectClass *) klass;
226 gobject_class->finalize = gst_selector_pad_finalize;
228 gobject_class->get_property = gst_selector_pad_get_property;
229 gobject_class->set_property = gst_selector_pad_set_property;
231 g_object_class_install_property (gobject_class, PROP_PAD_RUNNING_TIME,
232 g_param_spec_int64 ("running-time", "Running time",
233 "Running time of stream on pad", 0, G_MAXINT64, 0,
234 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
235 g_object_class_install_property (gobject_class, PROP_PAD_TAGS,
236 g_param_spec_boxed ("tags", "Tags",
237 "The currently active tags on the pad", GST_TYPE_TAG_LIST,
238 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
239 g_object_class_install_property (gobject_class, PROP_PAD_ACTIVE,
240 g_param_spec_boolean ("active", "Active",
241 "If the pad is currently active", FALSE,
242 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
243 /* FIXME: better property name? */
244 g_object_class_install_property (gobject_class, PROP_PAD_ALWAYS_OK,
245 g_param_spec_boolean ("always-ok", "Always OK",
246 "Make an inactive pad return OK instead of NOT_LINKED",
247 DEFAULT_PAD_ALWAYS_OK, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
251 gst_selector_pad_init (GstSelectorPad * pad)
253 pad->always_ok = DEFAULT_PAD_ALWAYS_OK;
254 gst_selector_pad_reset (pad);
258 gst_selector_pad_finalize (GObject * object)
262 pad = GST_SELECTOR_PAD_CAST (object);
265 gst_tag_list_unref (pad->tags);
266 gst_selector_pad_free_cached_buffers (pad);
268 G_OBJECT_CLASS (gst_selector_pad_parent_class)->finalize (object);
272 gst_selector_pad_set_property (GObject * object, guint prop_id,
273 const GValue * value, GParamSpec * pspec)
275 GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
278 case PROP_PAD_ALWAYS_OK:
279 GST_OBJECT_LOCK (object);
280 spad->always_ok = g_value_get_boolean (value);
281 GST_OBJECT_UNLOCK (object);
284 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
290 gst_selector_pad_get_property (GObject * object, guint prop_id,
291 GValue * value, GParamSpec * pspec)
293 GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
296 case PROP_PAD_RUNNING_TIME:
297 g_value_set_int64 (value, gst_selector_pad_get_running_time (spad));
300 GST_OBJECT_LOCK (object);
301 g_value_set_boxed (value, spad->tags);
302 GST_OBJECT_UNLOCK (object);
304 case PROP_PAD_ACTIVE:
306 GstInputSelector *sel;
308 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (spad));
310 g_value_set_boolean (value, gst_input_selector_is_active_sinkpad (sel,
311 GST_PAD_CAST (spad)));
312 gst_object_unref (sel);
314 g_value_set_boolean (value, FALSE);
318 case PROP_PAD_ALWAYS_OK:
319 GST_OBJECT_LOCK (object);
320 g_value_set_boolean (value, spad->always_ok);
321 GST_OBJECT_UNLOCK (object);
324 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
330 gst_selector_pad_get_running_time (GstSelectorPad * pad)
334 GST_OBJECT_LOCK (pad);
337 gst_segment_to_running_time (&pad->segment, pad->segment.format,
338 pad->segment.position);
340 GST_OBJECT_UNLOCK (pad);
342 GST_DEBUG_OBJECT (pad, "running time: %" GST_TIME_FORMAT
343 " segment: %" GST_SEGMENT_FORMAT, GST_TIME_ARGS (ret), &pad->segment);
348 /* must be called with the SELECTOR_LOCK */
350 gst_selector_pad_reset (GstSelectorPad * pad)
352 GST_OBJECT_LOCK (pad);
356 pad->eos_sent = FALSE;
357 pad->events_pending = FALSE;
358 pad->discont = FALSE;
359 pad->flushing = FALSE;
360 gst_segment_init (&pad->segment, GST_FORMAT_UNDEFINED);
361 pad->sending_cached_buffers = FALSE;
362 gst_selector_pad_free_cached_buffers (pad);
363 GST_OBJECT_UNLOCK (pad);
366 static GstSelectorPadCachedBuffer *
367 gst_selector_pad_new_cached_buffer (GstSelectorPad * selpad, GstBuffer * buffer)
369 GstSelectorPadCachedBuffer *cached_buffer =
370 g_slice_new (GstSelectorPadCachedBuffer);
371 cached_buffer->buffer = buffer;
372 cached_buffer->segment = selpad->segment;
373 return cached_buffer;
377 gst_selector_pad_free_cached_buffer (GstSelectorPadCachedBuffer * cached_buffer)
379 gst_buffer_unref (cached_buffer->buffer);
380 g_slice_free (GstSelectorPadCachedBuffer, cached_buffer);
383 /* must be called with the SELECTOR_LOCK */
385 gst_selector_pad_cache_buffer (GstSelectorPad * selpad, GstBuffer * buffer)
387 if (selpad->segment.format != GST_FORMAT_TIME) {
388 GST_DEBUG_OBJECT (selpad, "Buffer %p with segment not in time format, "
389 "not caching", buffer);
393 GST_DEBUG_OBJECT (selpad, "Caching buffer %p", buffer);
394 if (!selpad->cached_buffers)
395 selpad->cached_buffers = g_queue_new ();
396 g_queue_push_tail (selpad->cached_buffers,
397 gst_selector_pad_new_cached_buffer (selpad, buffer));
400 /* must be called with the SELECTOR_LOCK */
402 gst_selector_pad_free_cached_buffers (GstSelectorPad * selpad)
404 if (!selpad->cached_buffers)
407 GST_DEBUG_OBJECT (selpad, "Freeing cached buffers");
408 g_queue_free_full (selpad->cached_buffers,
409 (GDestroyNotify) gst_selector_pad_free_cached_buffer);
410 selpad->cached_buffers = NULL;
413 /* strictly get the linked pad from the sinkpad. If the pad is active we return
414 * the srcpad else we return NULL */
416 gst_selector_pad_iterate_linked_pads (GstPad * pad, GstObject * parent)
418 GstInputSelector *sel;
420 GstIterator *it = NULL;
423 sel = GST_INPUT_SELECTOR (parent);
425 otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE);
427 g_value_init (&val, GST_TYPE_PAD);
428 g_value_set_object (&val, otherpad);
429 it = gst_iterator_new_single (GST_TYPE_PAD, &val);
430 g_value_unset (&val);
431 gst_object_unref (otherpad);
438 gst_selector_pad_event (GstPad * pad, GstObject * parent, GstEvent * event)
442 gboolean new_tags = FALSE;
443 GstInputSelector *sel;
444 GstSelectorPad *selpad;
445 GstPad *prev_active_sinkpad;
446 GstPad *active_sinkpad;
448 sel = GST_INPUT_SELECTOR (parent);
449 selpad = GST_SELECTOR_PAD_CAST (pad);
450 GST_DEBUG_OBJECT (selpad, "received event %" GST_PTR_FORMAT, event);
452 GST_INPUT_SELECTOR_LOCK (sel);
453 prev_active_sinkpad =
454 sel->active_sinkpad ? gst_object_ref (sel->active_sinkpad) : NULL;
455 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
456 GST_INPUT_SELECTOR_UNLOCK (sel);
458 if (prev_active_sinkpad != active_sinkpad) {
459 if (prev_active_sinkpad)
460 g_object_notify (G_OBJECT (prev_active_sinkpad), "active");
461 g_object_notify (G_OBJECT (active_sinkpad), "active");
462 g_object_notify (G_OBJECT (sel), "active-pad");
464 if (prev_active_sinkpad)
465 gst_object_unref (prev_active_sinkpad);
467 GST_INPUT_SELECTOR_LOCK (sel);
469 /* only forward if we are dealing with the active sinkpad */
470 forward = (pad == active_sinkpad);
472 switch (GST_EVENT_TYPE (event)) {
473 case GST_EVENT_STREAM_START:{
476 if (!gst_event_parse_group_id (event, &group_id))
477 sel->have_group_id = FALSE;
480 case GST_EVENT_FLUSH_START:
481 /* Unblock the pad if it's waiting */
482 selpad->flushing = TRUE;
483 GST_INPUT_SELECTOR_BROADCAST (sel);
485 case GST_EVENT_FLUSH_STOP:
486 gst_selector_pad_reset (selpad);
488 case GST_EVENT_SEGMENT:
490 gst_event_copy_segment (event, &selpad->segment);
491 selpad->segment_seqnum = gst_event_get_seqnum (event);
493 GST_DEBUG_OBJECT (pad, "configured SEGMENT %" GST_SEGMENT_FORMAT,
499 GstTagList *tags, *oldtags, *newtags;
501 gst_event_parse_tag (event, &tags);
503 GST_OBJECT_LOCK (selpad);
504 oldtags = selpad->tags;
506 newtags = gst_tag_list_merge (oldtags, tags, GST_TAG_MERGE_REPLACE);
507 selpad->tags = newtags;
508 GST_OBJECT_UNLOCK (selpad);
511 gst_tag_list_unref (oldtags);
512 GST_DEBUG_OBJECT (pad, "received tags %" GST_PTR_FORMAT, newtags);
521 selpad->eos_sent = TRUE;
523 GstSelectorPad *active_selpad;
525 /* If the active sinkpad is in EOS state but EOS
526 * was not sent downstream this means that the pad
527 * got EOS before it was set as active pad and that
528 * the previously active pad got EOS after it was
531 active_selpad = GST_SELECTOR_PAD (active_sinkpad);
532 forward = (active_selpad->eos && !active_selpad->eos_sent);
533 active_selpad->eos_sent = TRUE;
535 GST_DEBUG_OBJECT (pad, "received EOS");
538 GstClockTime ts, dur;
540 GST_DEBUG_OBJECT (pad, "Received gap event: %" GST_PTR_FORMAT, event);
542 gst_event_parse_gap (event, &ts, &dur);
543 if (GST_CLOCK_TIME_IS_VALID (ts)) {
544 if (GST_CLOCK_TIME_IS_VALID (dur))
547 /* update the segment position */
548 GST_OBJECT_LOCK (pad);
549 selpad->segment.position = ts;
550 GST_OBJECT_UNLOCK (pad);
551 if (sel->sync_streams && active_sinkpad == pad)
552 GST_INPUT_SELECTOR_BROADCAST (sel);
560 GST_INPUT_SELECTOR_UNLOCK (sel);
562 g_object_notify (G_OBJECT (selpad), "tags");
564 GST_DEBUG_OBJECT (pad, "forwarding event");
565 res = gst_pad_push_event (sel->srcpad, event);
567 /* If we aren't forwarding the event because the pad is not the
568 * active_sinkpad, then set the flag on the pad
569 * that says a segment needs sending if/when that pad is activated.
570 * For all other cases, we send the event immediately, which makes
571 * sparse streams and other segment updates work correctly downstream.
573 if (GST_EVENT_IS_STICKY (event))
574 selpad->events_pending = TRUE;
575 gst_event_unref (event);
582 gst_selector_pad_query (GstPad * pad, GstObject * parent, GstQuery * query)
584 gboolean res = FALSE;
585 GstInputSelector *self = (GstInputSelector *) parent;
587 switch (GST_QUERY_TYPE (query)) {
589 /* always proxy caps query, regardless of active pad or not */
590 res = gst_pad_peer_query (self->srcpad, query);
592 case GST_QUERY_ALLOCATION:{
593 GstPad *active_sinkpad;
594 GstInputSelector *sel = GST_INPUT_SELECTOR (parent);
596 /* Only do the allocation query for the active sinkpad,
597 * after switching a reconfigure event is sent and upstream
598 * should reconfigure and do a new allocation query
600 if (GST_PAD_DIRECTION (pad) == GST_PAD_SINK) {
601 GST_INPUT_SELECTOR_LOCK (sel);
602 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
603 GST_INPUT_SELECTOR_UNLOCK (sel);
605 if (pad != active_sinkpad) {
613 res = gst_pad_query_default (pad, parent, query);
621 /* must be called with the SELECTOR_LOCK, will block while the pad is blocked
622 * or return TRUE when flushing */
624 gst_input_selector_wait (GstInputSelector * self, GstSelectorPad * pad)
626 while (self->blocked && !self->flushing && !pad->flushing) {
627 /* we can be unlocked here when we are shutting down (flushing) or when we
629 GST_INPUT_SELECTOR_WAIT (self);
631 return self->flushing;
634 /* must be called without the SELECTOR_LOCK, will wait until the running time
635 * of the active pad is after this pad or return TRUE when flushing */
637 gst_input_selector_wait_running_time (GstInputSelector * sel,
638 GstSelectorPad * selpad, GstBuffer * buf)
642 GST_DEBUG_OBJECT (selpad, "entering wait for buffer %p", buf);
644 /* If we have no valid timestamp we can't sync this buffer */
645 if (!GST_BUFFER_PTS_IS_VALID (buf)) {
646 GST_DEBUG_OBJECT (selpad, "leaving wait for buffer with "
647 "invalid timestamp");
651 seg = &selpad->segment;
654 * a) this is the active pad
655 * b) the pad or the selector is flushing
656 * c) the selector is not blocked
657 * d) the buffer running time is before the current running time
658 * (either active-seg or clock, depending on sync-mode)
661 GST_INPUT_SELECTOR_LOCK (sel);
663 GstPad *active_sinkpad;
664 GstSelectorPad *active_selpad;
666 gint64 cur_running_time;
667 GstClockTime running_time;
670 gst_input_selector_activate_sinkpad (sel, GST_PAD_CAST (selpad));
671 active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad);
673 if (seg->format != GST_FORMAT_TIME) {
674 GST_DEBUG_OBJECT (selpad,
675 "Not waiting because we don't have a TIME segment");
676 GST_INPUT_SELECTOR_UNLOCK (sel);
680 running_time = GST_BUFFER_PTS (buf);
681 /* If possible try to get the running time at the end of the buffer */
682 if (GST_BUFFER_DURATION_IS_VALID (buf))
683 running_time += GST_BUFFER_DURATION (buf);
684 /* Only use the segment to convert to running time if the segment is
685 * in TIME format, otherwise do our best to try to sync */
686 if (GST_CLOCK_TIME_IS_VALID (seg->stop)) {
687 if (running_time > seg->stop) {
688 running_time = seg->stop;
692 gst_segment_to_running_time (seg, GST_FORMAT_TIME, running_time);
693 /* If this is outside the segment don't sync */
694 if (running_time == -1) {
695 GST_DEBUG_OBJECT (selpad,
696 "Not waiting because buffer is outside segment");
697 GST_INPUT_SELECTOR_UNLOCK (sel);
701 cur_running_time = GST_CLOCK_TIME_NONE;
702 if (sel->sync_mode == GST_INPUT_SELECTOR_SYNC_MODE_CLOCK) {
703 clock = gst_element_get_clock (GST_ELEMENT_CAST (sel));
705 GstClockTime base_time;
707 cur_running_time = gst_clock_get_time (clock);
708 base_time = gst_element_get_base_time (GST_ELEMENT_CAST (sel));
709 if (base_time <= cur_running_time)
710 cur_running_time -= base_time;
712 cur_running_time = 0;
714 gst_object_unref (clock);
717 GstSegment *active_seg;
719 active_seg = &active_selpad->segment;
721 /* If the active segment is configured but not to time format
722 * we can't do any syncing at all */
723 if (active_seg->format != GST_FORMAT_TIME
724 && active_seg->format != GST_FORMAT_UNDEFINED) {
725 GST_DEBUG_OBJECT (selpad,
726 "Not waiting because active segment isn't in TIME format");
727 GST_INPUT_SELECTOR_UNLOCK (sel);
731 /* Get active pad's running time, if no configured segment yet keep at -1 */
732 if (active_seg->format == GST_FORMAT_TIME)
733 cur_running_time = gst_segment_to_running_time (active_seg,
734 GST_FORMAT_TIME, active_seg->position);
737 if (selpad != active_selpad && !sel->flushing && !selpad->flushing &&
738 (sel->blocked || cur_running_time == -1
739 || running_time >= cur_running_time)) {
741 GST_DEBUG_OBJECT (selpad,
742 "Waiting for active streams to advance. %" GST_TIME_FORMAT " >= %"
743 GST_TIME_FORMAT, GST_TIME_ARGS (running_time),
744 GST_TIME_ARGS (cur_running_time));
746 GST_DEBUG_OBJECT (selpad, "Waiting for selector to unblock");
748 GST_INPUT_SELECTOR_WAIT (sel);
750 GST_INPUT_SELECTOR_UNLOCK (sel);
755 /* Return TRUE if the selector or the pad is flushing */
756 return (sel->flushing || selpad->flushing);
760 forward_sticky_events (GstPad * sinkpad, GstEvent ** event, gpointer user_data)
762 GstInputSelector *sel = GST_INPUT_SELECTOR (user_data);
764 if (GST_EVENT_TYPE (*event) == GST_EVENT_SEGMENT) {
765 GstSegment *seg = &GST_SELECTOR_PAD (sinkpad)->segment;
768 e = gst_event_new_segment (seg);
769 gst_event_set_seqnum (e, GST_SELECTOR_PAD_CAST (sinkpad)->segment_seqnum);
771 gst_pad_push_event (sel->srcpad, e);
772 } else if (GST_EVENT_TYPE (*event) == GST_EVENT_STREAM_START
773 && !sel->have_group_id) {
775 gst_pad_get_sticky_event (sel->srcpad, GST_EVENT_STREAM_START, 0);
777 /* Only push stream-start once if not all our streams have a stream-id */
779 gst_pad_push_event (sel->srcpad, gst_event_ref (*event));
781 gst_event_unref (tmp);
784 gst_pad_push_event (sel->srcpad, gst_event_ref (*event));
790 #if DEBUG_CACHED_BUFFERS
792 gst_input_selector_debug_cached_buffers (GstInputSelector * sel)
796 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
797 GstSelectorPad *selpad;
802 selpad = GST_SELECTOR_PAD_CAST (walk->data);
803 if (!selpad->cached_buffers) {
804 GST_DEBUG_OBJECT (selpad, "Cached buffers timestamps: <none>");
808 timestamps = g_string_new ("Cached buffers timestamps:");
809 for (i = 0; i < selpad->cached_buffers->length; ++i) {
810 GstSelectorPadCachedBuffer *cached_buffer;
812 cached_buffer = g_queue_peek_nth (selpad->cached_buffers, i);
813 g_string_append_printf (timestamps, " %" GST_TIME_FORMAT,
814 GST_TIME_ARGS (GST_BUFFER_PTS (cached_buffer->buffer)));
816 str = g_string_free (timestamps, FALSE);
817 GST_DEBUG_OBJECT (selpad, "%s", str);
823 /* must be called with the SELECTOR_LOCK */
825 gst_input_selector_cleanup_old_cached_buffers (GstInputSelector * sel,
829 gint64 cur_running_time;
832 cur_running_time = GST_CLOCK_TIME_NONE;
833 if (sel->sync_mode == GST_INPUT_SELECTOR_SYNC_MODE_CLOCK) {
834 clock = gst_element_get_clock (GST_ELEMENT_CAST (sel));
836 GstClockTime base_time;
838 cur_running_time = gst_clock_get_time (clock);
839 base_time = gst_element_get_base_time (GST_ELEMENT_CAST (sel));
840 if (base_time <= cur_running_time)
841 cur_running_time -= base_time;
843 cur_running_time = 0;
845 gst_object_unref (clock);
848 GstPad *active_sinkpad;
849 GstSelectorPad *active_selpad;
850 GstSegment *active_seg;
852 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
853 active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad);
854 active_seg = &active_selpad->segment;
856 /* Get active pad's running time, if no configured segment yet keep at -1 */
857 if (active_seg->format == GST_FORMAT_TIME)
858 cur_running_time = gst_segment_to_running_time (active_seg,
859 GST_FORMAT_TIME, active_seg->position);
862 if (!GST_CLOCK_TIME_IS_VALID (cur_running_time))
865 GST_DEBUG_OBJECT (sel, "Cleaning up old cached buffers");
866 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
867 GstSelectorPad *selpad;
869 GstSelectorPadCachedBuffer *cached_buffer;
870 GSList *maybe_remove;
871 guint queue_position;
873 selpad = GST_SELECTOR_PAD_CAST (walk->data);
874 if (!selpad->cached_buffers)
877 seg = &selpad->segment;
881 while ((cached_buffer = g_queue_peek_nth (selpad->cached_buffers,
883 GstBuffer *buffer = cached_buffer->buffer;
884 GstClockTime running_time;
887 /* If we have no valid timestamp we can't sync this buffer */
888 if (!GST_BUFFER_PTS_IS_VALID (buffer)) {
889 maybe_remove = g_slist_append (maybe_remove, cached_buffer);
890 queue_position = g_slist_length (maybe_remove);
894 /* the buffer is still valid if its duration is valid and the
895 * timestamp + duration is >= time, or if its duration is invalid
896 * and the timestamp is >= time */
897 running_time = GST_BUFFER_PTS (buffer);
898 /* If possible try to get the running time at the end of the buffer */
899 if (GST_BUFFER_DURATION_IS_VALID (buffer))
900 running_time += GST_BUFFER_DURATION (buffer);
901 /* Only use the segment to convert to running time if the segment is
902 * in TIME format, otherwise do our best to try to sync */
903 if (GST_CLOCK_TIME_IS_VALID (seg->stop)) {
904 if (running_time > seg->stop) {
905 running_time = seg->stop;
909 gst_segment_to_running_time (seg, GST_FORMAT_TIME, running_time);
911 GST_DEBUG_OBJECT (selpad,
912 "checking if buffer %p running time=%" GST_TIME_FORMAT
913 " >= stream time=%" GST_TIME_FORMAT, buffer,
914 GST_TIME_ARGS (running_time), GST_TIME_ARGS (cur_running_time));
915 if (running_time >= cur_running_time) {
919 GST_DEBUG_OBJECT (selpad, "Removing old cached buffer %p", buffer);
920 g_queue_pop_nth (selpad->cached_buffers, queue_position);
921 gst_selector_pad_free_cached_buffer (cached_buffer);
923 for (l = maybe_remove; l != NULL; l = g_slist_next (l)) {
924 /* A buffer after some invalid buffers was removed, it means the invalid buffers
925 * are old, lets also remove them */
926 cached_buffer = l->data;
927 g_queue_remove (selpad->cached_buffers, cached_buffer);
928 gst_selector_pad_free_cached_buffer (cached_buffer);
931 g_slist_free (maybe_remove);
936 g_slist_free (maybe_remove);
939 if (g_queue_is_empty (selpad->cached_buffers)) {
940 g_queue_free (selpad->cached_buffers);
941 selpad->cached_buffers = NULL;
945 #if DEBUG_CACHED_BUFFERS
946 gst_input_selector_debug_cached_buffers (sel);
951 gst_selector_pad_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
953 GstInputSelector *sel;
955 GstPad *active_sinkpad;
956 GstPad *prev_active_sinkpad = NULL;
957 GstSelectorPad *selpad;
959 sel = GST_INPUT_SELECTOR (parent);
960 selpad = GST_SELECTOR_PAD_CAST (pad);
962 GST_DEBUG_OBJECT (selpad,
963 "entering chain for buf %p with timestamp %" GST_TIME_FORMAT, buf,
964 GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
966 GST_INPUT_SELECTOR_LOCK (sel);
967 /* wait or check for flushing */
968 if (gst_input_selector_wait (sel, selpad)) {
969 GST_INPUT_SELECTOR_UNLOCK (sel);
973 GST_LOG_OBJECT (pad, "getting active pad");
975 prev_active_sinkpad =
976 sel->active_sinkpad ? gst_object_ref (sel->active_sinkpad) : NULL;
977 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
979 /* In sync mode wait until the active pad has advanced
980 * after the running time of the current buffer */
981 if (sel->sync_streams) {
982 /* call chain for each cached buffer if we are not the active pad
983 * or if we are the active pad but didn't push anything yet. */
984 if (active_sinkpad != pad || !selpad->pushed) {
985 /* no need to check for sel->cache_buffers as selpad->cached_buffers
986 * will only be valid if cache_buffers is TRUE */
987 if (selpad->cached_buffers && !selpad->sending_cached_buffers) {
988 GstSelectorPadCachedBuffer *cached_buffer;
989 GstSegment saved_segment;
991 saved_segment = selpad->segment;
993 selpad->sending_cached_buffers = TRUE;
994 while (!sel->flushing && !selpad->flushing &&
995 (cached_buffer = g_queue_pop_head (selpad->cached_buffers))) {
996 GST_DEBUG_OBJECT (pad, "Cached buffers found, "
997 "invoking chain for cached buffer %p", cached_buffer->buffer);
999 selpad->segment = cached_buffer->segment;
1000 selpad->events_pending = TRUE;
1001 GST_INPUT_SELECTOR_UNLOCK (sel);
1002 gst_selector_pad_chain (pad, parent, cached_buffer->buffer);
1003 GST_INPUT_SELECTOR_LOCK (sel);
1005 /* we may have cleaned up the queue in the meantime because of
1007 if (!selpad->cached_buffers) {
1011 selpad->sending_cached_buffers = FALSE;
1013 /* all cached buffers sent, restore segment for current buffer */
1014 selpad->segment = saved_segment;
1015 selpad->events_pending = TRUE;
1017 /* Might have changed while calling chain for cached buffers */
1018 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
1022 if (active_sinkpad != pad) {
1023 GST_INPUT_SELECTOR_UNLOCK (sel);
1024 if (gst_input_selector_wait_running_time (sel, selpad, buf))
1026 GST_INPUT_SELECTOR_LOCK (sel);
1029 /* Might have changed while waiting */
1030 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
1033 /* update the segment on the srcpad */
1034 if (GST_BUFFER_PTS_IS_VALID (buf)) {
1035 GstClockTime start_time = GST_BUFFER_PTS (buf);
1037 GST_LOG_OBJECT (pad, "received start time %" GST_TIME_FORMAT,
1038 GST_TIME_ARGS (start_time));
1039 if (GST_BUFFER_DURATION_IS_VALID (buf))
1040 GST_LOG_OBJECT (pad, "received end time %" GST_TIME_FORMAT,
1041 GST_TIME_ARGS (start_time + GST_BUFFER_DURATION (buf)));
1043 GST_OBJECT_LOCK (pad);
1044 selpad->segment.position = start_time;
1045 GST_OBJECT_UNLOCK (pad);
1048 /* Ignore buffers from pads except the selected one */
1049 if (pad != active_sinkpad)
1052 /* Tell all non-active pads that we advanced the running time */
1053 if (sel->sync_streams)
1054 GST_INPUT_SELECTOR_BROADCAST (sel);
1056 GST_INPUT_SELECTOR_UNLOCK (sel);
1058 if (prev_active_sinkpad != active_sinkpad) {
1059 if (prev_active_sinkpad)
1060 g_object_notify (G_OBJECT (prev_active_sinkpad), "active");
1061 g_object_notify (G_OBJECT (active_sinkpad), "active");
1062 g_object_notify (G_OBJECT (sel), "active-pad");
1065 /* if we have a pending events, push them now */
1066 if (G_UNLIKELY (prev_active_sinkpad != active_sinkpad
1067 || selpad->events_pending)) {
1068 gst_pad_sticky_events_foreach (GST_PAD_CAST (selpad), forward_sticky_events,
1070 selpad->events_pending = FALSE;
1073 if (prev_active_sinkpad) {
1074 gst_object_unref (prev_active_sinkpad);
1075 prev_active_sinkpad = NULL;
1078 if (selpad->discont) {
1079 buf = gst_buffer_make_writable (buf);
1081 GST_DEBUG_OBJECT (pad, "Marking discont buffer %p", buf);
1082 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
1083 selpad->discont = FALSE;
1087 GST_LOG_OBJECT (pad, "Forwarding buffer %p with timestamp %" GST_TIME_FORMAT,
1088 buf, GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
1090 /* Only make the buffer read-only when necessary */
1091 if (sel->sync_streams && sel->cache_buffers)
1092 buf = gst_buffer_ref (buf);
1093 res = gst_pad_push (sel->srcpad, buf);
1094 GST_LOG_OBJECT (pad, "Buffer %p forwarded result=%d", buf, res);
1096 GST_INPUT_SELECTOR_LOCK (sel);
1098 if (sel->sync_streams && sel->cache_buffers) {
1099 /* Might have changed while pushing */
1100 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
1101 /* only set pad to pushed if we are still the active pad */
1102 if (active_sinkpad == pad)
1103 selpad->pushed = TRUE;
1105 /* cache buffer as we may need it again if we change pads */
1106 gst_selector_pad_cache_buffer (selpad, buf);
1107 gst_input_selector_cleanup_old_cached_buffers (sel, pad);
1109 selpad->pushed = TRUE;
1111 GST_INPUT_SELECTOR_UNLOCK (sel);
1115 if (prev_active_sinkpad)
1116 gst_object_unref (prev_active_sinkpad);
1117 prev_active_sinkpad = NULL;
1121 /* dropped buffers */
1124 gboolean active_pad_pushed = GST_SELECTOR_PAD_CAST (active_sinkpad)->pushed;
1126 GST_DEBUG_OBJECT (pad, "Pad not active, discard buffer %p", buf);
1127 /* when we drop a buffer, we're creating a discont on this pad */
1128 selpad->discont = TRUE;
1129 GST_INPUT_SELECTOR_UNLOCK (sel);
1130 gst_buffer_unref (buf);
1132 /* figure out what to return upstream */
1133 GST_OBJECT_LOCK (selpad);
1134 if (selpad->always_ok || !active_pad_pushed)
1137 res = GST_FLOW_NOT_LINKED;
1138 GST_OBJECT_UNLOCK (selpad);
1144 GST_DEBUG_OBJECT (pad, "We are flushing, discard buffer %p", buf);
1145 gst_buffer_unref (buf);
1146 res = GST_FLOW_FLUSHING;
1151 static void gst_input_selector_dispose (GObject * object);
1152 static void gst_input_selector_finalize (GObject * object);
1154 static void gst_input_selector_set_property (GObject * object,
1155 guint prop_id, const GValue * value, GParamSpec * pspec);
1156 static void gst_input_selector_get_property (GObject * object,
1157 guint prop_id, GValue * value, GParamSpec * pspec);
1159 static GstPad *gst_input_selector_request_new_pad (GstElement * element,
1160 GstPadTemplate * templ, const gchar * unused, const GstCaps * caps);
1161 static void gst_input_selector_release_pad (GstElement * element, GstPad * pad);
1163 static GstStateChangeReturn gst_input_selector_change_state (GstElement *
1164 element, GstStateChange transition);
1166 static gboolean gst_input_selector_event (GstPad * pad, GstObject * parent,
1168 static gboolean gst_input_selector_query (GstPad * pad, GstObject * parent,
1170 static gint64 gst_input_selector_block (GstInputSelector * self);
1173 GST_DEBUG_CATEGORY_INIT (input_selector_debug, \
1174 "input-selector", 0, "An input stream selector element");
1175 #define gst_input_selector_parent_class parent_class
1176 G_DEFINE_TYPE_WITH_CODE (GstInputSelector, gst_input_selector, GST_TYPE_ELEMENT,
1180 gst_input_selector_class_init (GstInputSelectorClass * klass)
1182 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
1183 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
1185 gobject_class->dispose = gst_input_selector_dispose;
1186 gobject_class->finalize = gst_input_selector_finalize;
1188 gobject_class->set_property = gst_input_selector_set_property;
1189 gobject_class->get_property = gst_input_selector_get_property;
1191 g_object_class_install_property (gobject_class, PROP_N_PADS,
1192 g_param_spec_uint ("n-pads", "Number of Pads",
1193 "The number of sink pads", 0, G_MAXUINT, 0,
1194 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
1196 g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD,
1197 g_param_spec_object ("active-pad", "Active pad",
1198 "The currently active sink pad", GST_TYPE_PAD,
1199 G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING |
1200 G_PARAM_STATIC_STRINGS));
1203 * GstInputSelector:sync-streams
1205 * If set to %TRUE all inactive streams will be synced to the
1206 * running time of the active stream or to the current clock.
1208 * To make sure no buffers are dropped by input-selector
1209 * that might be needed when switching the active pad,
1210 * sync-mode should be set to "clock" and cache-buffers to TRUE.
1212 g_object_class_install_property (gobject_class, PROP_SYNC_STREAMS,
1213 g_param_spec_boolean ("sync-streams", "Sync Streams",
1214 "Synchronize inactive streams to the running time of the active "
1215 "stream or to the current clock",
1216 DEFAULT_SYNC_STREAMS,
1217 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
1218 GST_PARAM_MUTABLE_READY));
1221 * GstInputSelector:sync-mode
1223 * Select how input-selector will sync buffers when in sync-streams mode.
1225 * Note that when using the "active-segment" mode, the "active-segment" may
1226 * be ahead of current clock time when switching the active pad, as the current
1227 * active pad may have pushed more buffers than what was displayed/consumed,
1228 * which may cause delays and some missing buffers.
1230 g_object_class_install_property (gobject_class, PROP_SYNC_MODE,
1231 g_param_spec_enum ("sync-mode", "Sync mode",
1232 "Behavior in sync-streams mode", GST_TYPE_INPUT_SELECTOR_SYNC_MODE,
1234 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
1235 GST_PARAM_MUTABLE_READY));
1238 * GstInputSelector:cache-buffers
1240 * If set to %TRUE and GstInputSelector:sync-streams is also set to %TRUE,
1241 * the active pad will cache the buffers still considered valid (after current
1242 * running time, see sync-mode) to avoid missing frames if/when the pad is
1245 * The active pad may push more buffers than what is currently displayed/consumed
1246 * and when changing pads those buffers will be discarded and the only way to
1247 * reactivate that pad without loosing the already consumed buffers is to enable cache.
1249 g_object_class_install_property (gobject_class, PROP_CACHE_BUFFERS,
1250 g_param_spec_boolean ("cache-buffers", "Cache Buffers",
1251 "Cache buffers for active-pad",
1252 DEFAULT_CACHE_BUFFERS,
1253 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
1254 GST_PARAM_MUTABLE_READY));
1257 * GstInputSelector::block:
1258 * @inputselector: the #GstInputSelector
1260 * Block all sink pads in preparation for a switch. Returns the stop time of
1261 * the current switch segment, as a running time, or 0 if there is no current
1262 * active pad or the current active pad never received data.
1264 gst_input_selector_signals[SIGNAL_BLOCK] =
1265 g_signal_new ("block", G_TYPE_FROM_CLASS (klass),
1266 G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
1267 G_STRUCT_OFFSET (GstInputSelectorClass, block), NULL, NULL,
1268 g_cclosure_marshal_generic, G_TYPE_INT64, 0);
1270 gst_element_class_set_static_metadata (gstelement_class, "Input selector",
1271 "Generic", "N-to-1 input stream selector",
1272 "Julien Moutte <julien@moutte.net>, "
1273 "Jan Schmidt <thaytan@mad.scientist.com>, "
1274 "Wim Taymans <wim.taymans@gmail.com>");
1275 gst_element_class_add_pad_template (gstelement_class,
1276 gst_static_pad_template_get (&gst_input_selector_sink_factory));
1277 gst_element_class_add_pad_template (gstelement_class,
1278 gst_static_pad_template_get (&gst_input_selector_src_factory));
1280 gstelement_class->request_new_pad = gst_input_selector_request_new_pad;
1281 gstelement_class->release_pad = gst_input_selector_release_pad;
1282 gstelement_class->change_state = gst_input_selector_change_state;
1284 klass->block = GST_DEBUG_FUNCPTR (gst_input_selector_block);
1288 gst_input_selector_init (GstInputSelector * sel)
1290 sel->srcpad = gst_pad_new ("src", GST_PAD_SRC);
1291 gst_pad_set_iterate_internal_links_function (sel->srcpad,
1292 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
1293 gst_pad_set_query_function (sel->srcpad,
1294 GST_DEBUG_FUNCPTR (gst_input_selector_query));
1295 gst_pad_set_event_function (sel->srcpad,
1296 GST_DEBUG_FUNCPTR (gst_input_selector_event));
1297 GST_OBJECT_FLAG_SET (sel->srcpad, GST_PAD_FLAG_PROXY_CAPS);
1298 gst_element_add_pad (GST_ELEMENT (sel), sel->srcpad);
1299 /* sinkpad management */
1300 sel->active_sinkpad = NULL;
1302 sel->sync_streams = DEFAULT_SYNC_STREAMS;
1303 sel->have_group_id = TRUE;
1305 g_mutex_init (&sel->lock);
1306 g_cond_init (&sel->cond);
1307 sel->blocked = FALSE;
1309 /* lets give a change for downstream to do something on
1310 * active-pad change before we start pushing new buffers */
1311 g_signal_connect_data (sel, "notify::active-pad",
1312 (GCallback) gst_input_selector_active_pad_changed, NULL,
1313 NULL, G_CONNECT_AFTER);
1317 gst_input_selector_dispose (GObject * object)
1319 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
1321 if (sel->active_sinkpad) {
1322 gst_object_unref (sel->active_sinkpad);
1323 sel->active_sinkpad = NULL;
1325 G_OBJECT_CLASS (parent_class)->dispose (object);
1329 gst_input_selector_finalize (GObject * object)
1331 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
1333 g_mutex_clear (&sel->lock);
1334 g_cond_clear (&sel->cond);
1336 G_OBJECT_CLASS (parent_class)->finalize (object);
1339 /* this function must be called with the SELECTOR_LOCK. It returns TRUE when the
1340 * active pad changed. */
1342 gst_input_selector_set_active_pad (GstInputSelector * self, GstPad * pad)
1344 GstSelectorPad *old, *new;
1345 GstPad **active_pad_p;
1347 if (pad == self->active_sinkpad)
1350 old = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
1351 new = GST_SELECTOR_PAD_CAST (pad);
1353 GST_DEBUG_OBJECT (self, "setting active pad to %s:%s",
1354 GST_DEBUG_PAD_NAME (new));
1357 old->pushed = FALSE;
1359 new->pushed = FALSE;
1361 /* Send a new SEGMENT event on the new pad next */
1362 if (old != new && new)
1363 new->events_pending = TRUE;
1365 active_pad_p = &self->active_sinkpad;
1366 gst_object_replace ((GstObject **) active_pad_p, GST_OBJECT_CAST (pad));
1368 if (old && old != new)
1369 gst_pad_push_event (GST_PAD_CAST (old), gst_event_new_reconfigure ());
1371 gst_pad_push_event (GST_PAD_CAST (new), gst_event_new_reconfigure ());
1373 GST_DEBUG_OBJECT (self, "New active pad is %" GST_PTR_FORMAT,
1374 self->active_sinkpad);
1380 gst_input_selector_set_property (GObject * object, guint prop_id,
1381 const GValue * value, GParamSpec * pspec)
1383 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
1386 case PROP_ACTIVE_PAD:
1390 pad = g_value_get_object (value);
1392 GST_INPUT_SELECTOR_LOCK (sel);
1394 #if DEBUG_CACHED_BUFFERS
1395 gst_input_selector_debug_cached_buffers (sel);
1398 gst_input_selector_set_active_pad (sel, pad);
1400 #if DEBUG_CACHED_BUFFERS
1401 gst_input_selector_debug_cached_buffers (sel);
1404 GST_INPUT_SELECTOR_UNLOCK (sel);
1407 case PROP_SYNC_STREAMS:
1408 GST_INPUT_SELECTOR_LOCK (sel);
1409 sel->sync_streams = g_value_get_boolean (value);
1410 GST_INPUT_SELECTOR_UNLOCK (sel);
1412 case PROP_SYNC_MODE:
1413 GST_INPUT_SELECTOR_LOCK (sel);
1414 sel->sync_mode = g_value_get_enum (value);
1415 GST_INPUT_SELECTOR_UNLOCK (sel);
1417 case PROP_CACHE_BUFFERS:
1418 GST_INPUT_SELECTOR_LOCK (object);
1419 sel->cache_buffers = g_value_get_boolean (value);
1420 GST_INPUT_SELECTOR_UNLOCK (object);
1423 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1429 gst_input_selector_active_pad_changed (GstInputSelector * sel,
1430 GParamSpec * pspec, gpointer user_data)
1432 /* Wake up all non-active pads in sync mode, they might be
1433 * the active pad now */
1434 if (sel->sync_streams)
1435 GST_INPUT_SELECTOR_BROADCAST (sel);
1439 gst_input_selector_get_property (GObject * object, guint prop_id,
1440 GValue * value, GParamSpec * pspec)
1442 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
1446 GST_INPUT_SELECTOR_LOCK (object);
1447 g_value_set_uint (value, sel->n_pads);
1448 GST_INPUT_SELECTOR_UNLOCK (object);
1450 case PROP_ACTIVE_PAD:
1451 GST_INPUT_SELECTOR_LOCK (object);
1452 g_value_set_object (value, sel->active_sinkpad);
1453 GST_INPUT_SELECTOR_UNLOCK (object);
1455 case PROP_SYNC_STREAMS:
1456 GST_INPUT_SELECTOR_LOCK (object);
1457 g_value_set_boolean (value, sel->sync_streams);
1458 GST_INPUT_SELECTOR_UNLOCK (object);
1460 case PROP_SYNC_MODE:
1461 GST_INPUT_SELECTOR_LOCK (object);
1462 g_value_set_enum (value, sel->sync_mode);
1463 GST_INPUT_SELECTOR_UNLOCK (object);
1465 case PROP_CACHE_BUFFERS:
1466 GST_INPUT_SELECTOR_LOCK (object);
1467 g_value_set_boolean (value, sel->cache_buffers);
1468 GST_INPUT_SELECTOR_UNLOCK (object);
1471 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1477 gst_input_selector_get_linked_pad (GstInputSelector * sel, GstPad * pad,
1480 GstPad *otherpad = NULL;
1482 GST_INPUT_SELECTOR_LOCK (sel);
1483 if (pad == sel->srcpad)
1484 otherpad = sel->active_sinkpad;
1485 else if (pad == sel->active_sinkpad || !strict)
1486 otherpad = sel->srcpad;
1488 gst_object_ref (otherpad);
1489 GST_INPUT_SELECTOR_UNLOCK (sel);
1495 gst_input_selector_event (GstPad * pad, GstObject * parent, GstEvent * event)
1497 GstInputSelector *sel;
1498 gboolean result = FALSE;
1500 gboolean done = FALSE;
1501 GValue item = { 0, };
1503 GList *pushed_pads = NULL;
1505 sel = GST_INPUT_SELECTOR (parent);
1506 /* Send upstream events to all sinkpads */
1507 iter = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (sel));
1509 /* This is now essentially a copy of gst_pad_event_default_dispatch
1510 * with a different iterator */
1512 switch (gst_iterator_next (iter, &item)) {
1513 case GST_ITERATOR_OK:
1514 eventpad = g_value_get_object (&item);
1516 /* if already pushed, skip */
1517 if (g_list_find (pushed_pads, eventpad)) {
1518 g_value_reset (&item);
1522 gst_event_ref (event);
1523 result |= gst_pad_push_event (eventpad, event);
1525 g_value_reset (&item);
1527 case GST_ITERATOR_RESYNC:
1528 /* We don't reset the result here because we don't push the event
1529 * again on pads that got the event already and because we need
1530 * to consider the result of the previous pushes */
1531 gst_iterator_resync (iter);
1533 case GST_ITERATOR_ERROR:
1534 GST_ERROR_OBJECT (pad, "Could not iterate over sinkpads");
1537 case GST_ITERATOR_DONE:
1542 g_value_unset (&item);
1543 gst_iterator_free (iter);
1545 g_list_free (pushed_pads);
1547 gst_event_unref (event);
1552 /* query on the srcpad. We override this function because by default it will
1553 * only forward the query to one random sinkpad */
1555 gst_input_selector_query (GstPad * pad, GstObject * parent, GstQuery * query)
1557 gboolean res = FALSE;
1558 GstInputSelector *sel;
1560 sel = GST_INPUT_SELECTOR (parent);
1562 switch (GST_QUERY_TYPE (query)) {
1563 case GST_QUERY_LATENCY:
1566 GstClockTime resmin, resmax;
1573 /* perform the query on all sinkpads and combine the results. We take the
1574 * max of min and the min of max for the result latency. */
1575 GST_INPUT_SELECTOR_LOCK (sel);
1576 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk;
1577 walk = g_list_next (walk)) {
1578 GstPad *sinkpad = GST_PAD_CAST (walk->data);
1580 if (gst_pad_peer_query (sinkpad, query)) {
1581 GstClockTime min, max;
1584 /* one query succeeded, we succeed too */
1587 gst_query_parse_latency (query, &live, &min, &max);
1589 GST_DEBUG_OBJECT (sinkpad,
1590 "peer latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1591 ", live %d", GST_TIME_ARGS (min), GST_TIME_ARGS (max), live);
1598 else if (max < resmax)
1600 if (reslive == FALSE)
1605 GST_INPUT_SELECTOR_UNLOCK (sel);
1607 gst_query_set_latency (query, reslive, resmin, resmax);
1609 GST_DEBUG_OBJECT (sel,
1610 "total latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1611 ", live %d", GST_TIME_ARGS (resmin), GST_TIME_ARGS (resmax),
1618 res = gst_pad_query_default (pad, parent, query);
1625 /* check if the pad is the active sinkpad */
1626 static inline gboolean
1627 gst_input_selector_is_active_sinkpad (GstInputSelector * sel, GstPad * pad)
1631 GST_INPUT_SELECTOR_LOCK (sel);
1632 res = (pad == sel->active_sinkpad);
1633 GST_INPUT_SELECTOR_UNLOCK (sel);
1638 /* Get or create the active sinkpad, must be called with SELECTOR_LOCK */
1640 gst_input_selector_activate_sinkpad (GstInputSelector * sel, GstPad * pad)
1642 GstPad *active_sinkpad;
1643 GstSelectorPad *selpad;
1645 selpad = GST_SELECTOR_PAD_CAST (pad);
1647 selpad->active = TRUE;
1648 active_sinkpad = sel->active_sinkpad;
1649 if (active_sinkpad == NULL) {
1650 GValue item = G_VALUE_INIT;
1651 GstIterator *iter = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (sel));
1652 GstIteratorResult ires;
1654 while ((ires = gst_iterator_next (iter, &item)) == GST_ITERATOR_RESYNC)
1655 gst_iterator_resync (iter);
1656 if (ires == GST_ITERATOR_OK) {
1657 /* If no pad is currently selected, we return the first usable pad to
1658 * guarantee consistency */
1660 active_sinkpad = sel->active_sinkpad = g_value_dup_object (&item);
1661 g_value_reset (&item);
1662 GST_DEBUG_OBJECT (sel, "Activating pad %s:%s",
1663 GST_DEBUG_PAD_NAME (active_sinkpad));
1665 GST_WARNING_OBJECT (sel, "Couldn't find a default sink pad");
1666 gst_iterator_free (iter);
1669 return active_sinkpad;
1673 gst_input_selector_request_new_pad (GstElement * element,
1674 GstPadTemplate * templ, const gchar * unused, const GstCaps * caps)
1676 GstInputSelector *sel;
1678 GstPad *sinkpad = NULL;
1680 g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL);
1682 sel = GST_INPUT_SELECTOR (element);
1684 GST_INPUT_SELECTOR_LOCK (sel);
1686 GST_LOG_OBJECT (sel, "Creating new pad sink_%u", sel->padcount);
1687 name = g_strdup_printf ("sink_%u", sel->padcount++);
1688 sinkpad = g_object_new (GST_TYPE_SELECTOR_PAD,
1689 "name", name, "direction", templ->direction, "template", templ, NULL);
1694 gst_pad_set_event_function (sinkpad,
1695 GST_DEBUG_FUNCPTR (gst_selector_pad_event));
1696 gst_pad_set_query_function (sinkpad,
1697 GST_DEBUG_FUNCPTR (gst_selector_pad_query));
1698 gst_pad_set_chain_function (sinkpad,
1699 GST_DEBUG_FUNCPTR (gst_selector_pad_chain));
1700 gst_pad_set_iterate_internal_links_function (sinkpad,
1701 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
1703 GST_OBJECT_FLAG_SET (sinkpad, GST_PAD_FLAG_PROXY_CAPS);
1704 GST_OBJECT_FLAG_SET (sinkpad, GST_PAD_FLAG_PROXY_ALLOCATION);
1705 gst_pad_set_active (sinkpad, TRUE);
1706 gst_element_add_pad (GST_ELEMENT (sel), sinkpad);
1707 GST_INPUT_SELECTOR_UNLOCK (sel);
1713 gst_input_selector_release_pad (GstElement * element, GstPad * pad)
1715 GstInputSelector *sel;
1717 sel = GST_INPUT_SELECTOR (element);
1718 GST_LOG_OBJECT (sel, "Releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1720 GST_INPUT_SELECTOR_LOCK (sel);
1721 /* if the pad was the active pad, makes us select a new one */
1722 if (sel->active_sinkpad == pad) {
1723 GST_DEBUG_OBJECT (sel, "Deactivating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1724 gst_object_unref (sel->active_sinkpad);
1725 sel->active_sinkpad = NULL;
1728 GST_INPUT_SELECTOR_UNLOCK (sel);
1730 gst_pad_set_active (pad, FALSE);
1731 gst_element_remove_pad (GST_ELEMENT (sel), pad);
1735 gst_input_selector_reset (GstInputSelector * sel)
1739 GST_INPUT_SELECTOR_LOCK (sel);
1740 /* clear active pad */
1741 if (sel->active_sinkpad) {
1742 gst_object_unref (sel->active_sinkpad);
1743 sel->active_sinkpad = NULL;
1745 /* reset each of our sinkpads state */
1746 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
1747 GstSelectorPad *selpad = GST_SELECTOR_PAD_CAST (walk->data);
1749 gst_selector_pad_reset (selpad);
1752 gst_tag_list_unref (selpad->tags);
1753 selpad->tags = NULL;
1756 sel->have_group_id = TRUE;
1757 GST_INPUT_SELECTOR_UNLOCK (sel);
1760 static GstStateChangeReturn
1761 gst_input_selector_change_state (GstElement * element,
1762 GstStateChange transition)
1764 GstInputSelector *self = GST_INPUT_SELECTOR (element);
1765 GstStateChangeReturn result;
1767 switch (transition) {
1768 case GST_STATE_CHANGE_READY_TO_PAUSED:
1769 GST_INPUT_SELECTOR_LOCK (self);
1770 self->blocked = FALSE;
1771 self->flushing = FALSE;
1772 GST_INPUT_SELECTOR_UNLOCK (self);
1774 case GST_STATE_CHANGE_PAUSED_TO_READY:
1775 /* first unlock before we call the parent state change function, which
1776 * tries to acquire the stream lock when going to ready. */
1777 GST_INPUT_SELECTOR_LOCK (self);
1778 self->blocked = FALSE;
1779 self->flushing = TRUE;
1780 GST_INPUT_SELECTOR_BROADCAST (self);
1781 GST_INPUT_SELECTOR_UNLOCK (self);
1787 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1789 switch (transition) {
1790 case GST_STATE_CHANGE_PAUSED_TO_READY:
1791 gst_input_selector_reset (self);
1801 gst_input_selector_block (GstInputSelector * self)
1804 GstSelectorPad *spad;
1806 GST_INPUT_SELECTOR_LOCK (self);
1809 GST_WARNING_OBJECT (self, "switch already blocked");
1811 self->blocked = TRUE;
1812 spad = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
1815 ret = gst_selector_pad_get_running_time (spad);
1817 GST_DEBUG_OBJECT (self, "no active pad while blocking");
1819 GST_INPUT_SELECTOR_UNLOCK (self);