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., 59 Temple Place - Suite 330,
23 * Boston, MA 02111-1307, 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 #include "gst/glib-compat-private.h"
62 #define DEBUG_CACHED_BUFFERS 0
64 GST_DEBUG_CATEGORY_STATIC (input_selector_debug);
65 #define GST_CAT_DEFAULT input_selector_debug
67 #define GST_TYPE_INPUT_SELECTOR_SYNC_MODE (gst_input_selector_sync_mode_get_type())
69 gst_input_selector_sync_mode_get_type (void)
71 static GType type = 0;
72 static const GEnumValue data[] = {
73 {GST_INPUT_SELECTOR_SYNC_MODE_ACTIVE_SEGMENT,
74 "Sync using the current active segment",
76 {GST_INPUT_SELECTOR_SYNC_MODE_CLOCK, "Sync using the clock", "clock"},
81 type = g_enum_register_static ("GstInputSelectorSyncMode", data);
86 #define GST_INPUT_SELECTOR_GET_LOCK(sel) (&((GstInputSelector*)(sel))->lock)
87 #define GST_INPUT_SELECTOR_GET_COND(sel) (&((GstInputSelector*)(sel))->cond)
88 #define GST_INPUT_SELECTOR_LOCK(sel) (g_mutex_lock (GST_INPUT_SELECTOR_GET_LOCK(sel)))
89 #define GST_INPUT_SELECTOR_UNLOCK(sel) (g_mutex_unlock (GST_INPUT_SELECTOR_GET_LOCK(sel)))
90 #define GST_INPUT_SELECTOR_WAIT(sel) (g_cond_wait (GST_INPUT_SELECTOR_GET_COND(sel), \
91 GST_INPUT_SELECTOR_GET_LOCK(sel)))
92 #define GST_INPUT_SELECTOR_BROADCAST(sel) (g_cond_broadcast (GST_INPUT_SELECTOR_GET_COND(sel)))
94 static GstStaticPadTemplate gst_input_selector_sink_factory =
95 GST_STATIC_PAD_TEMPLATE ("sink_%u",
100 static GstStaticPadTemplate gst_input_selector_src_factory =
101 GST_STATIC_PAD_TEMPLATE ("src",
104 GST_STATIC_CAPS_ANY);
116 #define DEFAULT_SYNC_STREAMS TRUE
117 #define DEFAULT_SYNC_MODE GST_INPUT_SELECTOR_SYNC_MODE_ACTIVE_SEGMENT
118 #define DEFAULT_CACHE_BUFFERS FALSE
119 #define DEFAULT_PAD_ALWAYS_OK TRUE
124 PROP_PAD_RUNNING_TIME,
137 static guint gst_input_selector_signals[LAST_SIGNAL] = { 0 };
139 static void gst_input_selector_active_pad_changed (GstInputSelector * sel,
140 GParamSpec * pspec, gpointer user_data);
141 static inline gboolean gst_input_selector_is_active_sinkpad (GstInputSelector *
143 static GstPad *gst_input_selector_activate_sinkpad (GstInputSelector * sel,
145 static GstPad *gst_input_selector_get_linked_pad (GstInputSelector * sel,
146 GstPad * pad, gboolean strict);
148 #define GST_TYPE_SELECTOR_PAD \
149 (gst_selector_pad_get_type())
150 #define GST_SELECTOR_PAD(obj) \
151 (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_SELECTOR_PAD, GstSelectorPad))
152 #define GST_SELECTOR_PAD_CLASS(klass) \
153 (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_SELECTOR_PAD, GstSelectorPadClass))
154 #define GST_IS_SELECTOR_PAD(obj) \
155 (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_SELECTOR_PAD))
156 #define GST_IS_SELECTOR_PAD_CLASS(klass) \
157 (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_SELECTOR_PAD))
158 #define GST_SELECTOR_PAD_CAST(obj) \
159 ((GstSelectorPad *)(obj))
161 typedef struct _GstSelectorPad GstSelectorPad;
162 typedef struct _GstSelectorPadClass GstSelectorPadClass;
163 typedef struct _GstSelectorPadCachedBuffer GstSelectorPadCachedBuffer;
165 struct _GstSelectorPad
169 gboolean active; /* when buffer have passed the pad */
170 gboolean pushed; /* when buffer was pushed downstream since activation */
171 gboolean eos; /* when EOS has been received */
172 gboolean eos_sent; /* when EOS was sent downstream */
173 gboolean discont; /* after switching we create a discont */
174 gboolean flushing; /* set after flush-start and before flush-stop */
176 GstTagList *tags; /* last tags received on the pad */
178 GstClockTime position; /* the current position in the segment */
179 GstSegment segment; /* the current segment on the pad */
180 guint32 segment_seqnum; /* sequence number of the current segment */
182 gboolean events_pending; /* TRUE if sticky events need to be updated */
184 gboolean sending_cached_buffers;
185 GQueue *cached_buffers;
188 struct _GstSelectorPadCachedBuffer
194 struct _GstSelectorPadClass
199 GType gst_selector_pad_get_type (void);
200 static void gst_selector_pad_finalize (GObject * object);
201 static void gst_selector_pad_get_property (GObject * object,
202 guint prop_id, GValue * value, GParamSpec * pspec);
203 static void gst_selector_pad_set_property (GObject * object,
204 guint prop_id, const GValue * value, GParamSpec * pspec);
206 static gint64 gst_selector_pad_get_running_time (GstSelectorPad * pad);
207 static void gst_selector_pad_reset (GstSelectorPad * pad);
208 static gboolean gst_selector_pad_event (GstPad * pad, GstObject * parent,
210 static gboolean gst_selector_pad_query (GstPad * pad, GstObject * parent,
212 static GstIterator *gst_selector_pad_iterate_linked_pads (GstPad * pad,
214 static GstFlowReturn gst_selector_pad_chain (GstPad * pad, GstObject * parent,
216 static void gst_selector_pad_cache_buffer (GstSelectorPad * selpad,
218 static void gst_selector_pad_free_cached_buffers (GstSelectorPad * selpad);
220 G_DEFINE_TYPE (GstSelectorPad, gst_selector_pad, GST_TYPE_PAD);
223 gst_selector_pad_class_init (GstSelectorPadClass * klass)
225 GObjectClass *gobject_class;
227 gobject_class = (GObjectClass *) klass;
229 gobject_class->finalize = gst_selector_pad_finalize;
231 gobject_class->get_property = gst_selector_pad_get_property;
232 gobject_class->set_property = gst_selector_pad_set_property;
234 g_object_class_install_property (gobject_class, PROP_PAD_RUNNING_TIME,
235 g_param_spec_int64 ("running-time", "Running time",
236 "Running time of stream on pad", 0, G_MAXINT64, 0,
237 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
238 g_object_class_install_property (gobject_class, PROP_PAD_TAGS,
239 g_param_spec_boxed ("tags", "Tags",
240 "The currently active tags on the pad", GST_TYPE_TAG_LIST,
241 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
242 g_object_class_install_property (gobject_class, PROP_PAD_ACTIVE,
243 g_param_spec_boolean ("active", "Active",
244 "If the pad is currently active", FALSE,
245 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
246 /* FIXME: better property name? */
247 g_object_class_install_property (gobject_class, PROP_PAD_ALWAYS_OK,
248 g_param_spec_boolean ("always-ok", "Always OK",
249 "Make an inactive pad return OK instead of NOT_LINKED",
250 DEFAULT_PAD_ALWAYS_OK, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
254 gst_selector_pad_init (GstSelectorPad * pad)
256 pad->always_ok = DEFAULT_PAD_ALWAYS_OK;
257 gst_selector_pad_reset (pad);
261 gst_selector_pad_finalize (GObject * object)
265 pad = GST_SELECTOR_PAD_CAST (object);
268 gst_tag_list_unref (pad->tags);
269 gst_selector_pad_free_cached_buffers (pad);
271 G_OBJECT_CLASS (gst_selector_pad_parent_class)->finalize (object);
275 gst_selector_pad_set_property (GObject * object, guint prop_id,
276 const GValue * value, GParamSpec * pspec)
278 GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
281 case PROP_PAD_ALWAYS_OK:
282 GST_OBJECT_LOCK (object);
283 spad->always_ok = g_value_get_boolean (value);
284 GST_OBJECT_UNLOCK (object);
287 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
293 gst_selector_pad_get_property (GObject * object, guint prop_id,
294 GValue * value, GParamSpec * pspec)
296 GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
299 case PROP_PAD_RUNNING_TIME:
300 g_value_set_int64 (value, gst_selector_pad_get_running_time (spad));
303 GST_OBJECT_LOCK (object);
304 g_value_set_boxed (value, spad->tags);
305 GST_OBJECT_UNLOCK (object);
307 case PROP_PAD_ACTIVE:
309 GstInputSelector *sel;
311 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (spad));
312 g_value_set_boolean (value, gst_input_selector_is_active_sinkpad (sel,
313 GST_PAD_CAST (spad)));
314 gst_object_unref (sel);
317 case PROP_PAD_ALWAYS_OK:
318 GST_OBJECT_LOCK (object);
319 g_value_set_boolean (value, spad->always_ok);
320 GST_OBJECT_UNLOCK (object);
323 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
329 gst_selector_pad_get_running_time (GstSelectorPad * pad)
333 GST_OBJECT_LOCK (pad);
335 guint64 position = pad->position;
336 GstFormat format = pad->segment.format;
338 ret = gst_segment_to_running_time (&pad->segment, format, 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 pad->position = GST_CLOCK_TIME_NONE;
361 gst_segment_init (&pad->segment, GST_FORMAT_UNDEFINED);
362 pad->sending_cached_buffers = FALSE;
363 gst_selector_pad_free_cached_buffers (pad);
364 GST_OBJECT_UNLOCK (pad);
367 static GstSelectorPadCachedBuffer *
368 gst_selector_pad_new_cached_buffer (GstSelectorPad * selpad, GstBuffer * buffer)
370 GstSelectorPadCachedBuffer *cached_buffer =
371 g_slice_new (GstSelectorPadCachedBuffer);
372 cached_buffer->buffer = buffer;
373 cached_buffer->segment = selpad->segment;
374 return cached_buffer;
378 gst_selector_pad_free_cached_buffer (GstSelectorPadCachedBuffer * cached_buffer)
380 gst_buffer_unref (cached_buffer->buffer);
381 g_slice_free (GstSelectorPadCachedBuffer, cached_buffer);
384 /* must be called with the SELECTOR_LOCK */
386 gst_selector_pad_cache_buffer (GstSelectorPad * selpad, GstBuffer * buffer)
388 if (selpad->segment.format != GST_FORMAT_TIME) {
389 GST_DEBUG_OBJECT (selpad, "Buffer %p with segment not in time format, "
390 "not caching", buffer);
394 GST_DEBUG_OBJECT (selpad, "Caching buffer %p", buffer);
395 if (!selpad->cached_buffers)
396 selpad->cached_buffers = g_queue_new ();
397 g_queue_push_tail (selpad->cached_buffers,
398 gst_selector_pad_new_cached_buffer (selpad, buffer));
401 /* must be called with the SELECTOR_LOCK */
403 gst_selector_pad_free_cached_buffers (GstSelectorPad * selpad)
405 GstSelectorPadCachedBuffer *cached_buffer;
407 if (!selpad->cached_buffers)
410 GST_DEBUG_OBJECT (selpad, "Freeing cached buffers");
411 while ((cached_buffer = g_queue_pop_head (selpad->cached_buffers)))
412 gst_selector_pad_free_cached_buffer (cached_buffer);
413 g_queue_free (selpad->cached_buffers);
414 selpad->cached_buffers = NULL;
417 /* strictly get the linked pad from the sinkpad. If the pad is active we return
418 * the srcpad else we return NULL */
420 gst_selector_pad_iterate_linked_pads (GstPad * pad, GstObject * parent)
422 GstInputSelector *sel;
424 GstIterator *it = NULL;
427 sel = GST_INPUT_SELECTOR (parent);
429 otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE);
431 g_value_init (&val, GST_TYPE_PAD);
432 g_value_set_object (&val, otherpad);
433 it = gst_iterator_new_single (GST_TYPE_PAD, &val);
434 g_value_unset (&val);
435 gst_object_unref (otherpad);
442 gst_selector_pad_event (GstPad * pad, GstObject * parent, GstEvent * event)
446 gboolean new_tags = FALSE;
447 GstInputSelector *sel;
448 GstSelectorPad *selpad;
449 GstPad *prev_active_sinkpad;
450 GstPad *active_sinkpad;
452 sel = GST_INPUT_SELECTOR (parent);
453 selpad = GST_SELECTOR_PAD_CAST (pad);
454 GST_DEBUG_OBJECT (selpad, "received event %" GST_PTR_FORMAT, event);
456 GST_INPUT_SELECTOR_LOCK (sel);
457 prev_active_sinkpad = sel->active_sinkpad;
458 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
459 GST_INPUT_SELECTOR_UNLOCK (sel);
461 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) {
462 g_object_notify (G_OBJECT (sel), "active-pad");
465 GST_INPUT_SELECTOR_LOCK (sel);
466 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
468 /* only forward if we are dealing with the active sinkpad */
469 forward = (pad == active_sinkpad);
471 switch (GST_EVENT_TYPE (event)) {
472 case GST_EVENT_FLUSH_START:
473 /* Unblock the pad if it's waiting */
474 selpad->flushing = TRUE;
475 GST_INPUT_SELECTOR_BROADCAST (sel);
477 case GST_EVENT_FLUSH_STOP:
478 gst_selector_pad_reset (selpad);
480 case GST_EVENT_SEGMENT:
482 gst_event_copy_segment (event, &selpad->segment);
483 selpad->segment_seqnum = gst_event_get_seqnum (event);
485 /* Update the position */
486 if (selpad->position == GST_CLOCK_TIME_NONE
487 || selpad->segment.position > selpad->position) {
488 selpad->position = selpad->segment.position;
489 } else if (selpad->position != GST_CLOCK_TIME_NONE
490 && selpad->position > selpad->segment.position) {
491 selpad->segment.position = selpad->position;
494 gst_event_unref (event);
495 event = gst_event_new_segment (&selpad->segment);
496 gst_event_set_seqnum (event, selpad->segment_seqnum);
499 GST_DEBUG_OBJECT (pad, "configured SEGMENT %" GST_SEGMENT_FORMAT,
505 GstTagList *tags, *oldtags, *newtags;
507 gst_event_parse_tag (event, &tags);
509 oldtags = selpad->tags;
511 newtags = gst_tag_list_merge (oldtags, tags, GST_TAG_MERGE_REPLACE);
512 selpad->tags = newtags;
514 gst_tag_list_unref (oldtags);
515 GST_DEBUG_OBJECT (pad, "received tags %" GST_PTR_FORMAT, newtags);
524 selpad->eos_sent = TRUE;
526 GstSelectorPad *active_selpad;
528 /* If the active sinkpad is in EOS state but EOS
529 * was not sent downstream this means that the pad
530 * got EOS before it was set as active pad and that
531 * the previously active pad got EOS after it was
534 active_selpad = GST_SELECTOR_PAD (active_sinkpad);
535 forward = (active_selpad->eos && !active_selpad->eos_sent);
536 active_selpad->eos_sent = TRUE;
538 GST_DEBUG_OBJECT (pad, "received EOS");
543 GST_INPUT_SELECTOR_UNLOCK (sel);
545 g_object_notify (G_OBJECT (selpad), "tags");
547 GST_DEBUG_OBJECT (pad, "forwarding event");
548 res = gst_pad_push_event (sel->srcpad, event);
550 /* If we aren't forwarding the event because the pad is not the
551 * active_sinkpad, then set the flag on the pad
552 * that says a segment needs sending if/when that pad is activated.
553 * For all other cases, we send the event immediately, which makes
554 * sparse streams and other segment updates work correctly downstream.
556 if (GST_EVENT_IS_STICKY (event))
557 selpad->events_pending = TRUE;
558 gst_event_unref (event);
565 gst_selector_pad_query (GstPad * pad, GstObject * parent, GstQuery * query)
567 gboolean res = FALSE;
569 switch (GST_QUERY_TYPE (query)) {
570 case GST_QUERY_ALLOCATION:{
571 GstPad *active_sinkpad;
572 GstInputSelector *sel = GST_INPUT_SELECTOR (parent);
574 /* Only do the allocation query for the active sinkpad,
575 * after switching a reconfigure event is sent and upstream
576 * should reconfigure and do a new allocation query
578 if (GST_PAD_DIRECTION (pad) == GST_PAD_SINK) {
579 GST_INPUT_SELECTOR_LOCK (sel);
580 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
581 GST_INPUT_SELECTOR_UNLOCK (sel);
583 if (pad != active_sinkpad) {
591 res = gst_pad_query_default (pad, parent, query);
599 /* must be called with the SELECTOR_LOCK, will block while the pad is blocked
600 * or return TRUE when flushing */
602 gst_input_selector_wait (GstInputSelector * self, GstSelectorPad * pad)
604 while (self->blocked && !self->flushing && !pad->flushing) {
605 /* we can be unlocked here when we are shutting down (flushing) or when we
607 GST_INPUT_SELECTOR_WAIT (self);
609 return self->flushing;
612 /* must be called without the SELECTOR_LOCK, will wait until the running time
613 * of the active pad is after this pad or return TRUE when flushing */
615 gst_input_selector_wait_running_time (GstInputSelector * sel,
616 GstSelectorPad * selpad, GstBuffer * buf)
620 GST_DEBUG_OBJECT (selpad, "entering wait for buffer %p", buf);
622 /* If we have no valid timestamp we can't sync this buffer */
623 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
624 GST_DEBUG_OBJECT (selpad, "leaving wait for buffer with "
625 "invalid timestamp");
629 seg = &selpad->segment;
632 * a) this is the active pad
633 * b) the pad or the selector is flushing
634 * c) the selector is not blocked
635 * d) the buffer running time is before the current running time
636 * (either active-seg or clock, depending on sync-mode)
639 GST_INPUT_SELECTOR_LOCK (sel);
641 GstPad *active_sinkpad;
642 GstSelectorPad *active_selpad;
644 gint64 cur_running_time;
645 GstClockTime running_time;
648 gst_input_selector_activate_sinkpad (sel, GST_PAD_CAST (selpad));
649 active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad);
651 if (seg->format != GST_FORMAT_TIME) {
652 GST_INPUT_SELECTOR_UNLOCK (sel);
656 running_time = GST_BUFFER_TIMESTAMP (buf);
657 /* If possible try to get the running time at the end of the buffer */
658 if (GST_BUFFER_DURATION_IS_VALID (buf))
659 running_time += GST_BUFFER_DURATION (buf);
660 /* Only use the segment to convert to running time if the segment is
661 * in TIME format, otherwise do our best to try to sync */
662 if (GST_CLOCK_TIME_IS_VALID (seg->stop)) {
663 if (running_time > seg->stop) {
664 running_time = seg->stop;
668 gst_segment_to_running_time (seg, GST_FORMAT_TIME, running_time);
669 /* If this is outside the segment don't sync */
670 if (running_time == -1) {
671 GST_INPUT_SELECTOR_UNLOCK (sel);
675 cur_running_time = GST_CLOCK_TIME_NONE;
676 if (sel->sync_mode == GST_INPUT_SELECTOR_SYNC_MODE_CLOCK) {
677 clock = gst_element_get_clock (GST_ELEMENT_CAST (sel));
679 GstClockTime base_time;
681 cur_running_time = gst_clock_get_time (clock);
682 base_time = gst_element_get_base_time (GST_ELEMENT_CAST (sel));
683 if (base_time <= cur_running_time)
684 cur_running_time -= base_time;
686 cur_running_time = 0;
689 GstSegment *active_seg;
691 active_seg = &active_selpad->segment;
693 /* If the active segment is configured but not to time format
694 * we can't do any syncing at all */
695 if (active_seg->format != GST_FORMAT_TIME
696 && active_seg->format != GST_FORMAT_UNDEFINED) {
697 GST_INPUT_SELECTOR_UNLOCK (sel);
701 /* Get active pad's running time, if no configured segment yet keep at -1 */
702 if (active_seg->format == GST_FORMAT_TIME)
703 cur_running_time = gst_segment_to_running_time (active_seg,
704 GST_FORMAT_TIME, active_seg->position);
707 if (selpad != active_selpad && !sel->flushing && !selpad->flushing &&
708 (sel->cache_buffers || active_selpad->pushed) &&
709 (sel->blocked || cur_running_time == -1
710 || running_time >= cur_running_time)) {
712 GST_DEBUG_OBJECT (selpad,
713 "Waiting for active streams to advance. %" GST_TIME_FORMAT " >= %"
714 GST_TIME_FORMAT, GST_TIME_ARGS (running_time),
715 GST_TIME_ARGS (cur_running_time));
718 GST_INPUT_SELECTOR_WAIT (sel);
720 GST_INPUT_SELECTOR_UNLOCK (sel);
725 /* Return TRUE if the selector or the pad is flushing */
726 return (sel->flushing || selpad->flushing);
730 forward_sticky_events (GstPad * sinkpad, GstEvent ** event, gpointer user_data)
732 GstInputSelector *sel = GST_INPUT_SELECTOR (user_data);
734 if (GST_EVENT_TYPE (*event) == GST_EVENT_SEGMENT) {
735 GstSegment *seg = &GST_SELECTOR_PAD (sinkpad)->segment;
738 e = gst_event_new_segment (seg);
739 gst_event_set_seqnum (e, GST_SELECTOR_PAD_CAST (sinkpad)->segment_seqnum);
741 gst_pad_push_event (sel->srcpad, e);
742 } else if (GST_EVENT_TYPE (*event) != GST_EVENT_STREAM_START) {
743 gst_pad_push_event (sel->srcpad, gst_event_ref (*event));
749 #if DEBUG_CACHED_BUFFERS
751 gst_input_selector_debug_cached_buffers (GstInputSelector * sel)
755 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
756 GstSelectorPad *selpad;
761 selpad = GST_SELECTOR_PAD_CAST (walk->data);
762 if (!selpad->cached_buffers) {
763 GST_DEBUG_OBJECT (selpad, "Cached buffers timestamps: <none>");
767 timestamps = g_string_new ("Cached buffers timestamps:");
768 for (i = 0; i < selpad->cached_buffers->length; ++i) {
769 GstSelectorPadCachedBuffer *cached_buffer;
771 cached_buffer = g_queue_peek_nth (selpad->cached_buffers, i);
772 g_string_append_printf (timestamps, " %" GST_TIME_FORMAT,
773 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (cached_buffer->buffer)));
775 str = g_string_free (timestamps, FALSE);
776 GST_DEBUG_OBJECT (selpad, str);
782 /* must be called with the SELECTOR_LOCK */
784 gst_input_selector_cleanup_old_cached_buffers (GstInputSelector * sel,
788 gint64 cur_running_time;
791 cur_running_time = GST_CLOCK_TIME_NONE;
792 if (sel->sync_mode == GST_INPUT_SELECTOR_SYNC_MODE_CLOCK) {
793 clock = gst_element_get_clock (GST_ELEMENT_CAST (sel));
795 GstClockTime base_time;
797 cur_running_time = gst_clock_get_time (clock);
798 base_time = gst_element_get_base_time (GST_ELEMENT_CAST (sel));
799 if (base_time <= cur_running_time)
800 cur_running_time -= base_time;
802 cur_running_time = 0;
805 GstPad *active_sinkpad;
806 GstSelectorPad *active_selpad;
807 GstSegment *active_seg;
809 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
810 active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad);
811 active_seg = &active_selpad->segment;
813 /* Get active pad's running time, if no configured segment yet keep at -1 */
814 if (active_seg->format == GST_FORMAT_TIME)
815 cur_running_time = gst_segment_to_running_time (active_seg,
816 GST_FORMAT_TIME, active_seg->position);
819 if (!GST_CLOCK_TIME_IS_VALID (cur_running_time))
822 GST_DEBUG_OBJECT (sel, "Cleaning up old cached buffers");
823 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
824 GstSelectorPad *selpad;
826 GstSelectorPadCachedBuffer *cached_buffer;
827 GSList *maybe_remove;
828 guint queue_position;
830 selpad = GST_SELECTOR_PAD_CAST (walk->data);
831 if (!selpad->cached_buffers)
834 seg = &selpad->segment;
838 while ((cached_buffer = g_queue_peek_nth (selpad->cached_buffers,
840 GstBuffer *buffer = cached_buffer->buffer;
841 GstClockTime running_time;
844 /* If we have no valid timestamp we can't sync this buffer */
845 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) {
846 maybe_remove = g_slist_append (maybe_remove, cached_buffer);
847 queue_position = g_slist_length (maybe_remove);
851 /* the buffer is still valid if its duration is valid and the
852 * timestamp + duration is >= time, or if its duration is invalid
853 * and the timestamp is >= time */
854 running_time = GST_BUFFER_TIMESTAMP (buffer);
855 /* If possible try to get the running time at the end of the buffer */
856 if (GST_BUFFER_DURATION_IS_VALID (buffer))
857 running_time += GST_BUFFER_DURATION (buffer);
858 /* Only use the segment to convert to running time if the segment is
859 * in TIME format, otherwise do our best to try to sync */
860 if (GST_CLOCK_TIME_IS_VALID (seg->stop)) {
861 if (running_time > seg->stop) {
862 running_time = seg->stop;
866 gst_segment_to_running_time (seg, GST_FORMAT_TIME, running_time);
868 GST_DEBUG_OBJECT (selpad,
869 "checking if buffer %p running time=%" GST_TIME_FORMAT
870 " >= stream time=%" GST_TIME_FORMAT, buffer,
871 GST_TIME_ARGS (running_time), GST_TIME_ARGS (cur_running_time));
872 if (running_time >= cur_running_time) {
876 GST_DEBUG_OBJECT (selpad, "Removing old cached buffer %p", buffer);
877 g_queue_pop_nth (selpad->cached_buffers, queue_position);
878 gst_selector_pad_free_cached_buffer (cached_buffer);
880 for (l = maybe_remove; l != NULL; l = g_slist_next (l)) {
881 /* A buffer after some invalid buffers was removed, it means the invalid buffers
882 * are old, lets also remove them */
883 cached_buffer = l->data;
884 g_queue_remove (selpad->cached_buffers, cached_buffer);
885 gst_selector_pad_free_cached_buffer (cached_buffer);
888 g_slist_free (maybe_remove);
893 g_slist_free (maybe_remove);
896 if (g_queue_is_empty (selpad->cached_buffers)) {
897 g_queue_free (selpad->cached_buffers);
898 selpad->cached_buffers = NULL;
902 #if DEBUG_CACHED_BUFFERS
903 gst_input_selector_debug_cached_buffers (sel);
908 gst_selector_pad_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
910 GstInputSelector *sel;
912 GstPad *active_sinkpad;
913 GstPad *prev_active_sinkpad;
914 GstSelectorPad *selpad;
915 GstClockTime start_time;
917 sel = GST_INPUT_SELECTOR (parent);
918 selpad = GST_SELECTOR_PAD_CAST (pad);
920 GST_DEBUG_OBJECT (selpad,
921 "entering chain for buf %p with timestamp %" GST_TIME_FORMAT, buf,
922 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
924 GST_INPUT_SELECTOR_LOCK (sel);
925 /* wait or check for flushing */
926 if (gst_input_selector_wait (sel, selpad)) {
927 GST_INPUT_SELECTOR_UNLOCK (sel);
931 GST_LOG_OBJECT (pad, "getting active pad");
933 prev_active_sinkpad = sel->active_sinkpad;
934 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
936 /* In sync mode wait until the active pad has advanced
937 * after the running time of the current buffer */
938 if (sel->sync_streams) {
939 /* call chain for each cached buffer if we are not the active pad
940 * or if we are the active pad but didn't push anything yet. */
941 if (active_sinkpad != pad || !selpad->pushed) {
942 /* no need to check for sel->cache_buffers as selpad->cached_buffers
943 * will only be valid if cache_buffers is TRUE */
944 if (selpad->cached_buffers && !selpad->sending_cached_buffers) {
945 GstSelectorPadCachedBuffer *cached_buffer;
946 GstSegment saved_segment;
948 saved_segment = selpad->segment;
950 selpad->sending_cached_buffers = TRUE;
951 while (!sel->flushing && !selpad->flushing &&
952 (cached_buffer = g_queue_pop_head (selpad->cached_buffers))) {
953 GST_DEBUG_OBJECT (pad, "Cached buffers found, "
954 "invoking chain for cached buffer %p", cached_buffer->buffer);
956 selpad->segment = cached_buffer->segment;
957 selpad->events_pending = TRUE;
958 GST_INPUT_SELECTOR_UNLOCK (sel);
959 gst_selector_pad_chain (pad, parent, cached_buffer->buffer);
960 GST_INPUT_SELECTOR_LOCK (sel);
962 /* we may have cleaned up the queue in the meantime because of
964 if (!selpad->cached_buffers) {
968 selpad->sending_cached_buffers = FALSE;
970 /* all cached buffers sent, restore segment for current buffer */
971 selpad->segment = saved_segment;
972 selpad->events_pending = TRUE;
974 /* Might have changed while calling chain for cached buffers */
975 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
979 if (active_sinkpad != pad) {
980 GST_INPUT_SELECTOR_UNLOCK (sel);
981 if (gst_input_selector_wait_running_time (sel, selpad, buf))
983 GST_INPUT_SELECTOR_LOCK (sel);
986 /* Might have changed while waiting */
987 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
990 /* update the segment on the srcpad */
991 start_time = GST_BUFFER_TIMESTAMP (buf);
992 if (GST_CLOCK_TIME_IS_VALID (start_time)) {
993 GST_LOG_OBJECT (pad, "received start time %" GST_TIME_FORMAT,
994 GST_TIME_ARGS (start_time));
995 if (GST_BUFFER_DURATION_IS_VALID (buf))
996 GST_LOG_OBJECT (pad, "received end time %" GST_TIME_FORMAT,
997 GST_TIME_ARGS (start_time + GST_BUFFER_DURATION (buf)));
999 GST_OBJECT_LOCK (pad);
1000 selpad->position = start_time;
1001 selpad->segment.position = start_time;
1002 GST_OBJECT_UNLOCK (pad);
1005 /* Ignore buffers from pads except the selected one */
1006 if (pad != active_sinkpad)
1009 /* Tell all non-active pads that we advanced the running time */
1010 if (sel->sync_streams)
1011 GST_INPUT_SELECTOR_BROADCAST (sel);
1013 GST_INPUT_SELECTOR_UNLOCK (sel);
1015 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) {
1016 g_object_notify (G_OBJECT (sel), "active-pad");
1019 /* if we have a pending events, push them now */
1020 if (G_UNLIKELY (prev_active_sinkpad != active_sinkpad
1021 || selpad->events_pending)) {
1022 gst_pad_sticky_events_foreach (GST_PAD_CAST (selpad), forward_sticky_events,
1024 selpad->events_pending = FALSE;
1027 if (selpad->discont) {
1028 buf = gst_buffer_make_writable (buf);
1030 GST_DEBUG_OBJECT (pad, "Marking discont buffer %p", buf);
1031 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
1032 selpad->discont = FALSE;
1036 GST_LOG_OBJECT (pad, "Forwarding buffer %p with timestamp %" GST_TIME_FORMAT,
1037 buf, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
1039 res = gst_pad_push (sel->srcpad, gst_buffer_ref (buf));
1040 GST_LOG_OBJECT (pad, "Buffer %p forwarded result=%d", buf, res);
1042 GST_INPUT_SELECTOR_LOCK (sel);
1044 if (sel->sync_streams && sel->cache_buffers) {
1045 /* Might have changed while pushing */
1046 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
1047 /* only set pad to pushed if we are still the active pad */
1048 if (active_sinkpad == pad)
1049 selpad->pushed = TRUE;
1051 /* cache buffer as we may need it again if we change pads */
1052 gst_selector_pad_cache_buffer (selpad, buf);
1053 gst_input_selector_cleanup_old_cached_buffers (sel, pad);
1055 selpad->pushed = TRUE;
1056 gst_buffer_unref (buf);
1058 GST_INPUT_SELECTOR_UNLOCK (sel);
1063 /* dropped buffers */
1066 gboolean active_pad_pushed = GST_SELECTOR_PAD_CAST (active_sinkpad)->pushed;
1068 GST_DEBUG_OBJECT (pad, "Pad not active, discard buffer %p", buf);
1069 /* when we drop a buffer, we're creating a discont on this pad */
1070 selpad->discont = TRUE;
1071 GST_INPUT_SELECTOR_UNLOCK (sel);
1072 gst_buffer_unref (buf);
1074 /* figure out what to return upstream */
1075 GST_OBJECT_LOCK (selpad);
1076 if (selpad->always_ok || !active_pad_pushed)
1079 res = GST_FLOW_NOT_LINKED;
1080 GST_OBJECT_UNLOCK (selpad);
1086 GST_DEBUG_OBJECT (pad, "We are flushing, discard buffer %p", buf);
1087 gst_buffer_unref (buf);
1088 res = GST_FLOW_FLUSHING;
1093 static void gst_input_selector_dispose (GObject * object);
1094 static void gst_input_selector_finalize (GObject * object);
1096 static void gst_input_selector_set_property (GObject * object,
1097 guint prop_id, const GValue * value, GParamSpec * pspec);
1098 static void gst_input_selector_get_property (GObject * object,
1099 guint prop_id, GValue * value, GParamSpec * pspec);
1101 static GstPad *gst_input_selector_request_new_pad (GstElement * element,
1102 GstPadTemplate * templ, const gchar * unused, const GstCaps * caps);
1103 static void gst_input_selector_release_pad (GstElement * element, GstPad * pad);
1105 static GstStateChangeReturn gst_input_selector_change_state (GstElement *
1106 element, GstStateChange transition);
1108 static gboolean gst_input_selector_event (GstPad * pad, GstObject * parent,
1110 static gboolean gst_input_selector_query (GstPad * pad, GstObject * parent,
1112 static gint64 gst_input_selector_block (GstInputSelector * self);
1115 GST_DEBUG_CATEGORY_INIT (input_selector_debug, \
1116 "input-selector", 0, "An input stream selector element");
1117 #define gst_input_selector_parent_class parent_class
1118 G_DEFINE_TYPE_WITH_CODE (GstInputSelector, gst_input_selector, GST_TYPE_ELEMENT,
1122 gst_input_selector_class_init (GstInputSelectorClass * klass)
1124 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
1125 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
1127 gobject_class->dispose = gst_input_selector_dispose;
1128 gobject_class->finalize = gst_input_selector_finalize;
1130 gobject_class->set_property = gst_input_selector_set_property;
1131 gobject_class->get_property = gst_input_selector_get_property;
1133 g_object_class_install_property (gobject_class, PROP_N_PADS,
1134 g_param_spec_uint ("n-pads", "Number of Pads",
1135 "The number of sink pads", 0, G_MAXUINT, 0,
1136 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
1138 g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD,
1139 g_param_spec_object ("active-pad", "Active pad",
1140 "The currently active sink pad", GST_TYPE_PAD,
1141 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1144 * GstInputSelector:sync-streams
1146 * If set to %TRUE all inactive streams will be synced to the
1147 * running time of the active stream or to the current clock.
1149 * To make sure no buffers are dropped by input-selector
1150 * that might be needed when switching the active pad,
1151 * sync-mode should be set to "clock" and cache-buffers to TRUE.
1153 g_object_class_install_property (gobject_class, PROP_SYNC_STREAMS,
1154 g_param_spec_boolean ("sync-streams", "Sync Streams",
1155 "Synchronize inactive streams to the running time of the active "
1156 "stream or to the current clock",
1157 DEFAULT_SYNC_STREAMS,
1158 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
1159 GST_PARAM_MUTABLE_READY));
1162 * GstInputSelector:sync-mode
1164 * Select how input-selector will sync buffers when in sync-streams mode.
1166 * Note that when using the "active-segment" mode, the "active-segment" may
1167 * be ahead of current clock time when switching the active pad, as the current
1168 * active pad may have pushed more buffers than what was displayed/consumed,
1169 * which may cause delays and some missing buffers.
1171 g_object_class_install_property (gobject_class, PROP_SYNC_MODE,
1172 g_param_spec_enum ("sync-mode", "Sync mode",
1173 "Behavior in sync-streams mode", GST_TYPE_INPUT_SELECTOR_SYNC_MODE,
1175 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
1176 GST_PARAM_MUTABLE_READY));
1179 * GstInputSelector:cache-buffers
1181 * If set to %TRUE and GstInputSelector:sync-streams is also set to %TRUE,
1182 * the active pad will cache the buffers still considered valid (after current
1183 * running time, see sync-mode) to avoid missing frames if/when the pad is
1186 * The active pad may push more buffers than what is currently displayed/consumed
1187 * and when changing pads those buffers will be discarded and the only way to
1188 * reactivate that pad without loosing the already consumed buffers is to enable cache.
1190 g_object_class_install_property (gobject_class, PROP_CACHE_BUFFERS,
1191 g_param_spec_boolean ("cache-buffers", "Cache Buffers",
1192 "Cache buffers for active-pad",
1193 DEFAULT_CACHE_BUFFERS,
1194 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
1195 GST_PARAM_MUTABLE_READY));
1198 * GstInputSelector::block:
1199 * @inputselector: the #GstInputSelector
1201 * Block all sink pads in preparation for a switch. Returns the stop time of
1202 * the current switch segment, as a running time, or 0 if there is no current
1203 * active pad or the current active pad never received data.
1205 gst_input_selector_signals[SIGNAL_BLOCK] =
1206 g_signal_new ("block", G_TYPE_FROM_CLASS (klass),
1207 G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
1208 G_STRUCT_OFFSET (GstInputSelectorClass, block), NULL, NULL,
1209 g_cclosure_marshal_generic, G_TYPE_INT64, 0);
1211 gst_element_class_set_static_metadata (gstelement_class, "Input selector",
1212 "Generic", "N-to-1 input stream selector",
1213 "Julien Moutte <julien@moutte.net>, "
1214 "Jan Schmidt <thaytan@mad.scientist.com>, "
1215 "Wim Taymans <wim.taymans@gmail.com>");
1216 gst_element_class_add_pad_template (gstelement_class,
1217 gst_static_pad_template_get (&gst_input_selector_sink_factory));
1218 gst_element_class_add_pad_template (gstelement_class,
1219 gst_static_pad_template_get (&gst_input_selector_src_factory));
1221 gstelement_class->request_new_pad = gst_input_selector_request_new_pad;
1222 gstelement_class->release_pad = gst_input_selector_release_pad;
1223 gstelement_class->change_state = gst_input_selector_change_state;
1225 klass->block = GST_DEBUG_FUNCPTR (gst_input_selector_block);
1229 gst_input_selector_init (GstInputSelector * sel)
1231 sel->srcpad = gst_pad_new ("src", GST_PAD_SRC);
1232 gst_pad_set_iterate_internal_links_function (sel->srcpad,
1233 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
1234 gst_pad_set_query_function (sel->srcpad,
1235 GST_DEBUG_FUNCPTR (gst_input_selector_query));
1236 gst_pad_set_event_function (sel->srcpad,
1237 GST_DEBUG_FUNCPTR (gst_input_selector_event));
1238 GST_OBJECT_FLAG_SET (sel->srcpad, GST_PAD_FLAG_PROXY_CAPS);
1239 gst_element_add_pad (GST_ELEMENT (sel), sel->srcpad);
1240 /* sinkpad management */
1241 sel->active_sinkpad = NULL;
1243 sel->sync_streams = DEFAULT_SYNC_STREAMS;
1245 g_mutex_init (&sel->lock);
1246 g_cond_init (&sel->cond);
1247 sel->blocked = FALSE;
1249 /* lets give a change for downstream to do something on
1250 * active-pad change before we start pushing new buffers */
1251 g_signal_connect_data (sel, "notify::active-pad",
1252 (GCallback) gst_input_selector_active_pad_changed, NULL,
1253 NULL, G_CONNECT_AFTER);
1257 gst_input_selector_dispose (GObject * object)
1259 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
1261 if (sel->active_sinkpad) {
1262 gst_object_unref (sel->active_sinkpad);
1263 sel->active_sinkpad = NULL;
1265 G_OBJECT_CLASS (parent_class)->dispose (object);
1269 gst_input_selector_finalize (GObject * object)
1271 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
1273 g_mutex_clear (&sel->lock);
1274 g_cond_clear (&sel->cond);
1276 G_OBJECT_CLASS (parent_class)->finalize (object);
1279 /* this function must be called with the SELECTOR_LOCK. It returns TRUE when the
1280 * active pad changed. */
1282 gst_input_selector_set_active_pad (GstInputSelector * self, GstPad * pad)
1284 GstSelectorPad *old, *new;
1285 GstPad **active_pad_p;
1287 if (pad == self->active_sinkpad)
1290 old = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
1291 new = GST_SELECTOR_PAD_CAST (pad);
1293 GST_DEBUG_OBJECT (self, "setting active pad to %s:%s",
1294 GST_DEBUG_PAD_NAME (new));
1297 old->pushed = FALSE;
1299 new->pushed = FALSE;
1301 /* Send a new SEGMENT event on the new pad next */
1302 if (old != new && new)
1303 new->events_pending = TRUE;
1305 active_pad_p = &self->active_sinkpad;
1306 gst_object_replace ((GstObject **) active_pad_p, GST_OBJECT_CAST (pad));
1308 if (old && old != new)
1309 gst_pad_push_event (GST_PAD_CAST (old), gst_event_new_reconfigure ());
1311 gst_pad_push_event (GST_PAD_CAST (new), gst_event_new_reconfigure ());
1313 GST_DEBUG_OBJECT (self, "New active pad is %" GST_PTR_FORMAT,
1314 self->active_sinkpad);
1320 gst_input_selector_set_property (GObject * object, guint prop_id,
1321 const GValue * value, GParamSpec * pspec)
1323 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
1326 case PROP_ACTIVE_PAD:
1330 pad = g_value_get_object (value);
1332 GST_INPUT_SELECTOR_LOCK (sel);
1334 #if DEBUG_CACHED_BUFFERS
1335 gst_input_selector_debug_cached_buffers (sel);
1338 gst_input_selector_set_active_pad (sel, pad);
1340 #if DEBUG_CACHED_BUFFERS
1341 gst_input_selector_debug_cached_buffers (sel);
1344 GST_INPUT_SELECTOR_UNLOCK (sel);
1347 case PROP_SYNC_STREAMS:
1348 GST_INPUT_SELECTOR_LOCK (sel);
1349 sel->sync_streams = g_value_get_boolean (value);
1350 GST_INPUT_SELECTOR_UNLOCK (sel);
1352 case PROP_SYNC_MODE:
1353 GST_INPUT_SELECTOR_LOCK (sel);
1354 sel->sync_mode = g_value_get_enum (value);
1355 GST_INPUT_SELECTOR_UNLOCK (sel);
1357 case PROP_CACHE_BUFFERS:
1358 GST_INPUT_SELECTOR_LOCK (object);
1359 sel->cache_buffers = g_value_get_boolean (value);
1360 GST_INPUT_SELECTOR_UNLOCK (object);
1363 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1369 gst_input_selector_active_pad_changed (GstInputSelector * sel,
1370 GParamSpec * pspec, gpointer user_data)
1372 /* Wake up all non-active pads in sync mode, they might be
1373 * the active pad now */
1374 if (sel->sync_streams)
1375 GST_INPUT_SELECTOR_BROADCAST (sel);
1379 gst_input_selector_get_property (GObject * object, guint prop_id,
1380 GValue * value, GParamSpec * pspec)
1382 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
1386 GST_INPUT_SELECTOR_LOCK (object);
1387 g_value_set_uint (value, sel->n_pads);
1388 GST_INPUT_SELECTOR_UNLOCK (object);
1390 case PROP_ACTIVE_PAD:
1391 GST_INPUT_SELECTOR_LOCK (object);
1392 g_value_set_object (value, sel->active_sinkpad);
1393 GST_INPUT_SELECTOR_UNLOCK (object);
1395 case PROP_SYNC_STREAMS:
1396 GST_INPUT_SELECTOR_LOCK (object);
1397 g_value_set_boolean (value, sel->sync_streams);
1398 GST_INPUT_SELECTOR_UNLOCK (object);
1400 case PROP_SYNC_MODE:
1401 GST_INPUT_SELECTOR_LOCK (object);
1402 g_value_set_enum (value, sel->sync_mode);
1403 GST_INPUT_SELECTOR_UNLOCK (object);
1405 case PROP_CACHE_BUFFERS:
1406 GST_INPUT_SELECTOR_LOCK (object);
1407 g_value_set_boolean (value, sel->cache_buffers);
1408 GST_INPUT_SELECTOR_UNLOCK (object);
1411 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1417 gst_input_selector_get_linked_pad (GstInputSelector * sel, GstPad * pad,
1420 GstPad *otherpad = NULL;
1422 GST_INPUT_SELECTOR_LOCK (sel);
1423 if (pad == sel->srcpad)
1424 otherpad = sel->active_sinkpad;
1425 else if (pad == sel->active_sinkpad || !strict)
1426 otherpad = sel->srcpad;
1428 gst_object_ref (otherpad);
1429 GST_INPUT_SELECTOR_UNLOCK (sel);
1435 gst_input_selector_event (GstPad * pad, GstObject * parent, GstEvent * event)
1437 GstInputSelector *sel;
1438 gboolean result = FALSE;
1440 gboolean done = FALSE;
1441 GValue item = { 0, };
1443 GList *pushed_pads = NULL;
1445 sel = GST_INPUT_SELECTOR (parent);
1446 /* Send upstream events to all sinkpads */
1447 iter = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (sel));
1449 /* This is now essentially a copy of gst_pad_event_default_dispatch
1450 * with a different iterator */
1452 switch (gst_iterator_next (iter, &item)) {
1453 case GST_ITERATOR_OK:
1454 eventpad = g_value_get_object (&item);
1456 /* if already pushed, skip */
1457 if (g_list_find (pushed_pads, eventpad)) {
1458 g_value_reset (&item);
1462 gst_event_ref (event);
1463 result |= gst_pad_push_event (eventpad, event);
1465 g_value_reset (&item);
1467 case GST_ITERATOR_RESYNC:
1468 /* We don't reset the result here because we don't push the event
1469 * again on pads that got the event already and because we need
1470 * to consider the result of the previous pushes */
1471 gst_iterator_resync (iter);
1473 case GST_ITERATOR_ERROR:
1474 GST_ERROR_OBJECT (pad, "Could not iterate over sinkpads");
1477 case GST_ITERATOR_DONE:
1482 g_value_unset (&item);
1483 gst_iterator_free (iter);
1485 g_list_free (pushed_pads);
1487 gst_event_unref (event);
1492 /* query on the srcpad. We override this function because by default it will
1493 * only forward the query to one random sinkpad */
1495 gst_input_selector_query (GstPad * pad, GstObject * parent, GstQuery * query)
1497 gboolean res = FALSE;
1498 GstInputSelector *sel;
1500 sel = GST_INPUT_SELECTOR (parent);
1502 switch (GST_QUERY_TYPE (query)) {
1503 case GST_QUERY_LATENCY:
1506 GstClockTime resmin, resmax;
1513 /* perform the query on all sinkpads and combine the results. We take the
1514 * max of min and the min of max for the result latency. */
1515 GST_INPUT_SELECTOR_LOCK (sel);
1516 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk;
1517 walk = g_list_next (walk)) {
1518 GstPad *sinkpad = GST_PAD_CAST (walk->data);
1520 if (gst_pad_peer_query (sinkpad, query)) {
1521 GstClockTime min, max;
1524 /* one query succeeded, we succeed too */
1527 gst_query_parse_latency (query, &live, &min, &max);
1529 GST_DEBUG_OBJECT (sinkpad,
1530 "peer latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1531 ", live %d", GST_TIME_ARGS (min), GST_TIME_ARGS (max), live);
1538 else if (max < resmax)
1540 if (reslive == FALSE)
1545 GST_INPUT_SELECTOR_UNLOCK (sel);
1547 gst_query_set_latency (query, reslive, resmin, resmax);
1549 GST_DEBUG_OBJECT (sel,
1550 "total latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1551 ", live %d", GST_TIME_ARGS (resmin), GST_TIME_ARGS (resmax),
1558 res = gst_pad_query_default (pad, parent, query);
1565 /* check if the pad is the active sinkpad */
1566 static inline gboolean
1567 gst_input_selector_is_active_sinkpad (GstInputSelector * sel, GstPad * pad)
1571 GST_INPUT_SELECTOR_LOCK (sel);
1572 res = (pad == sel->active_sinkpad);
1573 GST_INPUT_SELECTOR_UNLOCK (sel);
1578 /* Get or create the active sinkpad, must be called with SELECTOR_LOCK */
1580 gst_input_selector_activate_sinkpad (GstInputSelector * sel, GstPad * pad)
1582 GstPad *active_sinkpad;
1583 GstSelectorPad *selpad;
1585 selpad = GST_SELECTOR_PAD_CAST (pad);
1587 selpad->active = TRUE;
1588 active_sinkpad = sel->active_sinkpad;
1589 if (sel->active_sinkpad == NULL) {
1590 GValue item = G_VALUE_INIT;
1591 GstIterator *iter = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (sel));
1592 GstIteratorResult ires;
1594 while ((ires = gst_iterator_next (iter, &item)) == GST_ITERATOR_RESYNC)
1595 gst_iterator_resync (iter);
1596 if (ires == GST_ITERATOR_OK) {
1597 /* If no pad is currently selected, we return the first usable pad to
1598 * guarantee consistency */
1600 active_sinkpad = sel->active_sinkpad = g_value_dup_object (&item);
1601 g_value_reset (&item);
1602 GST_DEBUG_OBJECT (sel, "Activating pad %s:%s",
1603 GST_DEBUG_PAD_NAME (active_sinkpad));
1605 GST_WARNING_OBJECT (sel, "Couldn't find a default sink pad");
1606 gst_iterator_free (iter);
1609 return active_sinkpad;
1613 gst_input_selector_request_new_pad (GstElement * element,
1614 GstPadTemplate * templ, const gchar * unused, const GstCaps * caps)
1616 GstInputSelector *sel;
1618 GstPad *sinkpad = NULL;
1620 g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL);
1622 sel = GST_INPUT_SELECTOR (element);
1624 GST_INPUT_SELECTOR_LOCK (sel);
1626 GST_LOG_OBJECT (sel, "Creating new pad %d", sel->padcount);
1627 name = g_strdup_printf ("sink_%u", sel->padcount++);
1628 sinkpad = g_object_new (GST_TYPE_SELECTOR_PAD,
1629 "name", name, "direction", templ->direction, "template", templ, NULL);
1634 gst_pad_set_event_function (sinkpad,
1635 GST_DEBUG_FUNCPTR (gst_selector_pad_event));
1636 gst_pad_set_query_function (sinkpad,
1637 GST_DEBUG_FUNCPTR (gst_selector_pad_query));
1638 gst_pad_set_chain_function (sinkpad,
1639 GST_DEBUG_FUNCPTR (gst_selector_pad_chain));
1640 gst_pad_set_iterate_internal_links_function (sinkpad,
1641 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
1643 GST_OBJECT_FLAG_SET (sinkpad, GST_PAD_FLAG_PROXY_CAPS);
1644 GST_OBJECT_FLAG_SET (sinkpad, GST_PAD_FLAG_PROXY_ALLOCATION);
1645 gst_pad_set_active (sinkpad, TRUE);
1646 gst_element_add_pad (GST_ELEMENT (sel), sinkpad);
1647 GST_INPUT_SELECTOR_UNLOCK (sel);
1653 gst_input_selector_release_pad (GstElement * element, GstPad * pad)
1655 GstInputSelector *sel;
1657 sel = GST_INPUT_SELECTOR (element);
1658 GST_LOG_OBJECT (sel, "Releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1660 GST_INPUT_SELECTOR_LOCK (sel);
1661 /* if the pad was the active pad, makes us select a new one */
1662 if (sel->active_sinkpad == pad) {
1663 GST_DEBUG_OBJECT (sel, "Deactivating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1664 gst_object_unref (sel->active_sinkpad);
1665 sel->active_sinkpad = NULL;
1669 gst_pad_set_active (pad, FALSE);
1670 gst_element_remove_pad (GST_ELEMENT (sel), pad);
1671 GST_INPUT_SELECTOR_UNLOCK (sel);
1675 gst_input_selector_reset (GstInputSelector * sel)
1679 GST_INPUT_SELECTOR_LOCK (sel);
1680 /* clear active pad */
1681 if (sel->active_sinkpad) {
1682 gst_object_unref (sel->active_sinkpad);
1683 sel->active_sinkpad = NULL;
1685 /* reset each of our sinkpads state */
1686 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
1687 GstSelectorPad *selpad = GST_SELECTOR_PAD_CAST (walk->data);
1689 gst_selector_pad_reset (selpad);
1692 gst_tag_list_unref (selpad->tags);
1693 selpad->tags = NULL;
1696 GST_INPUT_SELECTOR_UNLOCK (sel);
1699 static GstStateChangeReturn
1700 gst_input_selector_change_state (GstElement * element,
1701 GstStateChange transition)
1703 GstInputSelector *self = GST_INPUT_SELECTOR (element);
1704 GstStateChangeReturn result;
1706 switch (transition) {
1707 case GST_STATE_CHANGE_READY_TO_PAUSED:
1708 GST_INPUT_SELECTOR_LOCK (self);
1709 self->blocked = FALSE;
1710 self->flushing = FALSE;
1711 GST_INPUT_SELECTOR_UNLOCK (self);
1713 case GST_STATE_CHANGE_PAUSED_TO_READY:
1714 /* first unlock before we call the parent state change function, which
1715 * tries to acquire the stream lock when going to ready. */
1716 GST_INPUT_SELECTOR_LOCK (self);
1717 self->blocked = FALSE;
1718 self->flushing = TRUE;
1719 GST_INPUT_SELECTOR_BROADCAST (self);
1720 GST_INPUT_SELECTOR_UNLOCK (self);
1726 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1728 switch (transition) {
1729 case GST_STATE_CHANGE_PAUSED_TO_READY:
1730 gst_input_selector_reset (self);
1740 gst_input_selector_block (GstInputSelector * self)
1743 GstSelectorPad *spad;
1745 GST_INPUT_SELECTOR_LOCK (self);
1748 GST_WARNING_OBJECT (self, "switch already blocked");
1750 self->blocked = TRUE;
1751 spad = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
1754 ret = gst_selector_pad_get_running_time (spad);
1756 GST_DEBUG_OBJECT (self, "no active pad while blocking");
1758 GST_INPUT_SELECTOR_UNLOCK (self);