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>)
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Library General Public License for more details.
19 * You should have received a copy of the GNU Library General Public
20 * License along with this library; if not, write to the
21 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 * Boston, MA 02111-1307, USA.
26 * SECTION:element-input-selector
27 * @see_also: #GstOutputSelector
29 * Direct one out of N input streams to the output pad.
38 #include "gstinputselector.h"
39 #include "gstselector-marshal.h"
41 GST_DEBUG_CATEGORY_STATIC (input_selector_debug);
42 #define GST_CAT_DEFAULT input_selector_debug
44 static const GstElementDetails gst_input_selector_details =
45 GST_ELEMENT_DETAILS ("Input selector",
47 "N-to-1 input stream selectoring",
48 "Julien Moutte <julien@moutte.net>\n"
49 "Ronald S. Bultje <rbultje@ronald.bitfreak.net>\n"
50 "Jan Schmidt <thaytan@mad.scientist.com>\n"
51 "Wim Taymans <wim.taymans@gmail.com>");
53 static GstStaticPadTemplate gst_input_selector_sink_factory =
54 GST_STATIC_PAD_TEMPLATE ("sink%d",
59 static GstStaticPadTemplate gst_input_selector_src_factory =
60 GST_STATIC_PAD_TEMPLATE ("src",
74 #define DEFAULT_PAD_ALWAYS_OK TRUE
79 PROP_PAD_RUNNING_TIME,
93 static guint gst_input_selector_signals[LAST_SIGNAL] = { 0 };
95 static gboolean gst_input_selector_is_active_sinkpad (GstInputSelector * sel,
97 static GstPad *gst_input_selector_activate_sinkpad (GstInputSelector * sel,
99 static GstPad *gst_input_selector_get_linked_pad (GstPad * pad,
101 static gboolean gst_input_selector_check_eos (GstElement * selector);
103 #define GST_TYPE_SELECTOR_PAD \
104 (gst_selector_pad_get_type())
105 #define GST_SELECTOR_PAD(obj) \
106 (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_SELECTOR_PAD, GstSelectorPad))
107 #define GST_SELECTOR_PAD_CLASS(klass) \
108 (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_SELECTOR_PAD, GstSelectorPadClass))
109 #define GST_IS_SELECTOR_PAD(obj) \
110 (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_SELECTOR_PAD))
111 #define GST_IS_SELECTOR_PAD_CLASS(klass) \
112 (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_SELECTOR_PAD))
113 #define GST_SELECTOR_PAD_CAST(obj) \
114 ((GstSelectorPad *)(obj))
116 typedef struct _GstSelectorPad GstSelectorPad;
117 typedef struct _GstSelectorPadClass GstSelectorPadClass;
119 struct _GstSelectorPad
123 gboolean active; /* when buffer have passed the pad */
124 gboolean eos; /* when EOS has been received */
125 gboolean discont; /* after switching we create a discont */
127 GstSegment segment; /* the current segment on the pad */
128 GstTagList *tags; /* last tags received on the pad */
130 gboolean segment_pending;
133 struct _GstSelectorPadClass
138 static void gst_selector_pad_class_init (GstSelectorPadClass * klass);
139 static void gst_selector_pad_init (GstSelectorPad * pad);
140 static void gst_selector_pad_finalize (GObject * object);
141 static void gst_selector_pad_get_property (GObject * object,
142 guint prop_id, GValue * value, GParamSpec * pspec);
143 static void gst_selector_pad_set_property (GObject * object,
144 guint prop_id, const GValue * value, GParamSpec * pspec);
146 static GstPadClass *selector_pad_parent_class = NULL;
148 static gint64 gst_selector_pad_get_running_time (GstSelectorPad * pad);
149 static void gst_selector_pad_reset (GstSelectorPad * pad);
150 static gboolean gst_selector_pad_event (GstPad * pad, GstEvent * event);
151 static GstCaps *gst_selector_pad_getcaps (GstPad * pad);
152 static GstIterator *gst_selector_pad_iterate_linked_pads (GstPad * pad);
153 static GstFlowReturn gst_selector_pad_chain (GstPad * pad, GstBuffer * buf);
154 static GstFlowReturn gst_selector_pad_bufferalloc (GstPad * pad,
155 guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
158 gst_selector_pad_get_type (void)
160 static GType selector_pad_type = 0;
162 if (!selector_pad_type) {
163 static const GTypeInfo selector_pad_info = {
164 sizeof (GstSelectorPadClass),
167 (GClassInitFunc) gst_selector_pad_class_init,
170 sizeof (GstSelectorPad),
172 (GInstanceInitFunc) gst_selector_pad_init,
176 g_type_register_static (GST_TYPE_PAD, "GstSelectorPad",
177 &selector_pad_info, 0);
179 return selector_pad_type;
183 gst_selector_pad_class_init (GstSelectorPadClass * klass)
185 GObjectClass *gobject_class;
187 gobject_class = (GObjectClass *) klass;
189 selector_pad_parent_class = g_type_class_peek_parent (klass);
191 gobject_class->finalize = gst_selector_pad_finalize;
193 gobject_class->get_property =
194 GST_DEBUG_FUNCPTR (gst_selector_pad_get_property);
195 gobject_class->set_property =
196 GST_DEBUG_FUNCPTR (gst_selector_pad_set_property);
198 g_object_class_install_property (gobject_class, PROP_PAD_RUNNING_TIME,
199 g_param_spec_int64 ("running-time", "Running time",
200 "Running time of stream on pad", 0, G_MAXINT64, 0, G_PARAM_READABLE));
201 g_object_class_install_property (gobject_class, PROP_PAD_TAGS,
202 g_param_spec_boxed ("tags", "Tags",
203 "The currently active tags on the pad", GST_TYPE_TAG_LIST,
205 g_object_class_install_property (gobject_class, PROP_PAD_ACTIVE,
206 g_param_spec_boolean ("active", "Active",
207 "If the pad is currently active", FALSE, G_PARAM_READABLE));
208 g_object_class_install_property (gobject_class, PROP_PAD_ALWAYS_OK,
209 g_param_spec_boolean ("always-ok", "Always OK",
210 "Make an inactive pad return OK instead of NOT_LINKED",
211 DEFAULT_PAD_ALWAYS_OK, G_PARAM_READWRITE));
215 gst_selector_pad_init (GstSelectorPad * pad)
217 pad->always_ok = DEFAULT_PAD_ALWAYS_OK;
218 gst_selector_pad_reset (pad);
222 gst_selector_pad_finalize (GObject * object)
226 pad = GST_SELECTOR_PAD_CAST (object);
229 gst_tag_list_free (pad->tags);
231 G_OBJECT_CLASS (selector_pad_parent_class)->finalize (object);
235 gst_selector_pad_set_property (GObject * object, guint prop_id,
236 const GValue * value, GParamSpec * pspec)
238 GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
241 case PROP_PAD_ALWAYS_OK:
242 GST_OBJECT_LOCK (object);
243 spad->always_ok = g_value_get_boolean (value);
244 GST_OBJECT_UNLOCK (object);
247 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
253 gst_selector_pad_get_property (GObject * object, guint prop_id,
254 GValue * value, GParamSpec * pspec)
256 GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
259 case PROP_PAD_RUNNING_TIME:
260 g_value_set_int64 (value, gst_selector_pad_get_running_time (spad));
263 GST_OBJECT_LOCK (object);
264 g_value_set_boxed (value, spad->tags);
265 GST_OBJECT_UNLOCK (object);
267 case PROP_PAD_ACTIVE:
269 GstInputSelector *sel;
271 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (spad));
272 g_value_set_boolean (value, gst_input_selector_is_active_sinkpad (sel,
273 GST_PAD_CAST (spad)));
274 gst_object_unref (sel);
277 case PROP_PAD_ALWAYS_OK:
278 GST_OBJECT_LOCK (object);
279 g_value_set_boolean (value, spad->always_ok);
280 GST_OBJECT_UNLOCK (object);
283 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
289 gst_selector_pad_get_running_time (GstSelectorPad * pad)
293 GST_OBJECT_LOCK (pad);
295 gint64 last_stop = pad->segment.last_stop;
298 ret = gst_segment_to_running_time (&pad->segment, GST_FORMAT_TIME,
301 GST_OBJECT_UNLOCK (pad);
303 GST_DEBUG_OBJECT (pad, "running time: %" GST_TIME_FORMAT,
304 GST_TIME_ARGS (ret));
310 gst_selector_pad_reset (GstSelectorPad * pad)
312 GST_OBJECT_LOCK (pad);
315 pad->segment_pending = FALSE;
316 pad->discont = FALSE;
317 gst_segment_init (&pad->segment, GST_FORMAT_UNDEFINED);
318 GST_OBJECT_UNLOCK (pad);
321 /* strictly get the linked pad from the sinkpad. If the pad is active we return
322 * the srcpad else we return NULL */
325 gst_selector_pad_iterate_linked_pads (GstPad * pad)
327 GstInputSelector *sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
328 GstPad *opad = gst_input_selector_get_linked_pad (pad, TRUE);
329 GstIterator *it = gst_iterator_new_single (GST_TYPE_PAD, opad,
330 (GstCopyFunction) gst_object_ref, (GFreeFunc) gst_object_unref);
333 gst_object_unref (opad);
334 gst_object_unref (sel);
340 gst_selector_pad_event (GstPad * pad, GstEvent * event)
343 gboolean forward = TRUE;
344 GstInputSelector *sel;
345 GstSelectorPad *selpad;
346 GstPad *prev_active_sinkpad;
347 GstPad *active_sinkpad;
349 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
350 selpad = GST_SELECTOR_PAD_CAST (pad);
352 GST_INPUT_SELECTOR_LOCK (sel);
353 prev_active_sinkpad = sel->active_sinkpad;
354 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
356 /* only forward if we are dealing with the active sinkpad or if select_all
358 if (pad != active_sinkpad && !sel->select_all)
360 GST_INPUT_SELECTOR_UNLOCK (sel);
362 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad)
363 g_object_notify (G_OBJECT (sel), "active-pad");
365 switch (GST_EVENT_TYPE (event)) {
366 case GST_EVENT_FLUSH_START:
367 /* FIXME, flush out the waiter */
369 case GST_EVENT_FLUSH_STOP:
370 GST_INPUT_SELECTOR_LOCK (sel);
371 gst_selector_pad_reset (selpad);
372 sel->pending_close = FALSE;
373 GST_INPUT_SELECTOR_UNLOCK (sel);
375 case GST_EVENT_NEWSEGMENT:
380 gint64 start, stop, time;
382 gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
383 &start, &stop, &time);
385 GST_DEBUG_OBJECT (pad,
386 "configured NEWSEGMENT update %d, rate %lf, applied rate %lf, "
388 "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
389 G_GINT64_FORMAT, update, rate, arate, format, start, stop, time);
391 GST_INPUT_SELECTOR_LOCK (sel);
392 GST_OBJECT_LOCK (selpad);
393 gst_segment_set_newsegment_full (&selpad->segment, update,
394 rate, arate, format, start, stop, time);
395 GST_OBJECT_UNLOCK (selpad);
397 /* If we aren't forwarding the event (because the pad is not the
398 * active_sinkpad, and select_all is not set, then set the flag on the
399 * that says a segment needs sending if/when that pad is activated.
400 * For all other cases, we send the event immediately, which makes
401 * sparse streams and other segment updates work correctly downstream.
404 selpad->segment_pending = TRUE;
406 GST_INPUT_SELECTOR_UNLOCK (sel);
411 GstTagList *tags, *oldtags, *newtags;
413 gst_event_parse_tag (event, &tags);
415 GST_OBJECT_LOCK (selpad);
416 oldtags = selpad->tags;
418 newtags = gst_tag_list_merge (oldtags, tags, GST_TAG_MERGE_REPLACE);
419 selpad->tags = newtags;
421 gst_tag_list_free (oldtags);
422 GST_DEBUG_OBJECT (pad, "received tags %" GST_PTR_FORMAT, newtags);
423 GST_OBJECT_UNLOCK (selpad);
425 g_object_notify (G_OBJECT (selpad), "tags");
430 GST_DEBUG_OBJECT (pad, "received EOS");
431 /* don't forward eos in select_all mode until all sink pads have eos */
432 if (sel->select_all && !gst_input_selector_check_eos (GST_ELEMENT (sel))) {
440 GST_DEBUG_OBJECT (pad, "forwarding event");
441 res = gst_pad_push_event (sel->srcpad, event);
443 gst_event_unref (event);
445 gst_object_unref (sel);
451 gst_selector_pad_getcaps (GstPad * pad)
453 GstInputSelector *sel;
456 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
458 GST_DEBUG_OBJECT (sel, "Getting caps of srcpad peer");
459 caps = gst_pad_peer_get_caps (sel->srcpad);
461 caps = gst_caps_new_any ();
463 gst_object_unref (sel);
469 gst_selector_pad_bufferalloc (GstPad * pad, guint64 offset,
470 guint size, GstCaps * caps, GstBuffer ** buf)
472 GstInputSelector *sel;
473 GstFlowReturn result;
474 GstPad *active_sinkpad;
475 GstPad *prev_active_sinkpad;
476 GstSelectorPad *selpad;
478 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
479 selpad = GST_SELECTOR_PAD_CAST (pad);
481 GST_DEBUG_OBJECT (pad, "received alloc");
483 GST_INPUT_SELECTOR_LOCK (sel);
484 prev_active_sinkpad = sel->active_sinkpad;
485 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
487 if (pad != active_sinkpad)
490 GST_INPUT_SELECTOR_UNLOCK (sel);
492 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad)
493 g_object_notify (G_OBJECT (sel), "active-pad");
495 result = gst_pad_alloc_buffer (sel->srcpad, offset, size, caps, buf);
498 gst_object_unref (sel);
505 GST_INPUT_SELECTOR_UNLOCK (sel);
507 /* unselected pad, perform fallback alloc or return unlinked when
509 GST_OBJECT_LOCK (selpad);
510 if (selpad->always_ok) {
511 GST_DEBUG_OBJECT (pad, "Not selected, performing fallback allocation");
513 result = GST_FLOW_OK;
515 GST_DEBUG_OBJECT (pad, "Not selected, return NOT_LINKED");
516 result = GST_FLOW_NOT_LINKED;
518 GST_OBJECT_UNLOCK (selpad);
524 /* must be called with the SELECTOR_LOCK, will block while the pad is blocked
525 * or return TRUE when flushing */
527 gst_input_selector_wait (GstInputSelector * self, GstPad * pad)
529 while (self->blocked && !self->flushing) {
530 /* we can be unlocked here when we are shutting down (flushing) or when we
532 GST_INPUT_SELECTOR_WAIT (self);
534 return self->flushing;
538 gst_selector_pad_chain (GstPad * pad, GstBuffer * buf)
540 GstInputSelector *sel;
542 GstPad *active_sinkpad;
543 GstPad *prev_active_sinkpad;
544 GstSelectorPad *selpad;
545 GstClockTime end_time, duration;
547 GstEvent *close_event = NULL, *start_event = NULL;
549 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
550 selpad = GST_SELECTOR_PAD_CAST (pad);
551 seg = &selpad->segment;
553 GST_INPUT_SELECTOR_LOCK (sel);
554 /* wait or check for flushing */
555 if (gst_input_selector_wait (sel, pad))
558 GST_DEBUG_OBJECT (pad, "getting active pad");
560 prev_active_sinkpad = sel->active_sinkpad;
561 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
563 /* update the segment on the srcpad */
564 end_time = GST_BUFFER_TIMESTAMP (buf);
565 if (GST_CLOCK_TIME_IS_VALID (end_time)) {
566 duration = GST_BUFFER_DURATION (buf);
567 if (GST_CLOCK_TIME_IS_VALID (duration))
568 end_time += duration;
569 GST_DEBUG_OBJECT (pad, "received end time %" GST_TIME_FORMAT,
570 GST_TIME_ARGS (end_time));
572 GST_OBJECT_LOCK (pad);
573 gst_segment_set_last_stop (seg, seg->format, end_time);
574 GST_OBJECT_UNLOCK (pad);
577 /* Ignore buffers from pads except the selected one */
578 if (pad != active_sinkpad)
581 if (G_UNLIKELY (sel->pending_close)) {
582 GstSegment *cseg = &sel->segment;
584 GST_DEBUG_OBJECT (sel,
585 "pushing NEWSEGMENT update %d, rate %lf, applied rate %lf, "
587 "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
588 G_GINT64_FORMAT, TRUE, cseg->rate, cseg->applied_rate, cseg->format,
589 cseg->start, cseg->stop, cseg->time);
591 /* create update segment */
592 close_event = gst_event_new_new_segment_full (TRUE, cseg->rate,
593 cseg->applied_rate, cseg->format, cseg->start, cseg->stop, cseg->time);
595 sel->pending_close = FALSE;
597 /* if we have a pending segment, push it out now */
598 if (G_UNLIKELY (selpad->segment_pending)) {
599 GST_DEBUG_OBJECT (pad,
600 "pushing NEWSEGMENT update %d, rate %lf, applied rate %lf, "
602 "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
603 G_GINT64_FORMAT, FALSE, seg->rate, seg->applied_rate, seg->format,
604 seg->start, seg->stop, seg->time);
606 start_event = gst_event_new_new_segment_full (FALSE, seg->rate,
607 seg->applied_rate, seg->format, seg->start, seg->stop, seg->time);
609 selpad->segment_pending = FALSE;
611 GST_INPUT_SELECTOR_UNLOCK (sel);
613 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad)
614 g_object_notify (G_OBJECT (sel), "active-pad");
617 gst_pad_push_event (sel->srcpad, close_event);
620 gst_pad_push_event (sel->srcpad, start_event);
622 if (selpad->discont) {
623 buf = gst_buffer_make_metadata_writable (buf);
625 GST_DEBUG_OBJECT (pad, "Marking discont buffer %p", buf);
626 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
627 selpad->discont = FALSE;
631 GST_DEBUG_OBJECT (pad, "Forwarding buffer %p from pad %s:%s", buf,
632 GST_DEBUG_PAD_NAME (pad));
634 res = gst_pad_push (sel->srcpad, buf);
637 gst_object_unref (sel);
640 /* dropped buffers */
643 GST_DEBUG_OBJECT (pad, "Pad not active, discard buffer %p", buf);
644 /* when we drop a buffer, we're creating a discont on this pad */
645 selpad->discont = TRUE;
646 GST_INPUT_SELECTOR_UNLOCK (sel);
647 gst_buffer_unref (buf);
649 /* figure out what to return upstream */
650 GST_OBJECT_LOCK (selpad);
651 if (selpad->always_ok)
654 res = GST_FLOW_NOT_LINKED;
655 GST_OBJECT_UNLOCK (selpad);
661 GST_DEBUG_OBJECT (pad, "We are flushing, discard buffer %p", buf);
662 GST_INPUT_SELECTOR_UNLOCK (sel);
663 gst_buffer_unref (buf);
664 res = GST_FLOW_WRONG_STATE;
669 static void gst_input_selector_init (GstInputSelector * sel);
670 static void gst_input_selector_base_init (GstInputSelectorClass * klass);
671 static void gst_input_selector_class_init (GstInputSelectorClass * klass);
673 static void gst_input_selector_dispose (GObject * object);
675 static void gst_input_selector_set_property (GObject * object,
676 guint prop_id, const GValue * value, GParamSpec * pspec);
677 static void gst_input_selector_get_property (GObject * object,
678 guint prop_id, GValue * value, GParamSpec * pspec);
680 static GstPad *gst_input_selector_request_new_pad (GstElement * element,
681 GstPadTemplate * templ, const gchar * unused);
682 static void gst_input_selector_release_pad (GstElement * element, GstPad * pad);
684 static GstStateChangeReturn gst_input_selector_change_state (GstElement *
685 element, GstStateChange transition);
687 static GstCaps *gst_input_selector_getcaps (GstPad * pad);
688 static gboolean gst_input_selector_event (GstPad * pad, GstEvent * event);
689 static gboolean gst_input_selector_query (GstPad * pad, GstQuery * query);
690 static gint64 gst_input_selector_block (GstInputSelector * self);
691 static void gst_input_selector_switch (GstInputSelector * self,
692 GstPad * pad, gint64 stop_time, gint64 start_time);
694 static GstElementClass *parent_class = NULL;
697 gst_input_selector_get_type (void)
699 static GType input_selector_type = 0;
701 if (!input_selector_type) {
702 static const GTypeInfo input_selector_info = {
703 sizeof (GstInputSelectorClass),
704 (GBaseInitFunc) gst_input_selector_base_init,
706 (GClassInitFunc) gst_input_selector_class_init,
709 sizeof (GstInputSelector),
711 (GInstanceInitFunc) gst_input_selector_init,
713 input_selector_type =
714 g_type_register_static (GST_TYPE_ELEMENT,
715 "GstInputSelector", &input_selector_info, 0);
716 GST_DEBUG_CATEGORY_INIT (input_selector_debug,
717 "input-selector", 0, "An input stream selector element");
720 return input_selector_type;
724 gst_input_selector_base_init (GstInputSelectorClass * klass)
726 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
728 gst_element_class_set_details (element_class, &gst_input_selector_details);
729 gst_element_class_add_pad_template (element_class,
730 gst_static_pad_template_get (&gst_input_selector_sink_factory));
731 gst_element_class_add_pad_template (element_class,
732 gst_static_pad_template_get (&gst_input_selector_src_factory));
736 gst_input_selector_class_init (GstInputSelectorClass * klass)
738 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
739 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
741 parent_class = g_type_class_peek_parent (klass);
743 gobject_class->dispose = gst_input_selector_dispose;
745 gobject_class->set_property =
746 GST_DEBUG_FUNCPTR (gst_input_selector_set_property);
747 gobject_class->get_property =
748 GST_DEBUG_FUNCPTR (gst_input_selector_get_property);
750 g_object_class_install_property (gobject_class, PROP_N_PADS,
751 g_param_spec_uint ("n-pads", "Number of Pads",
752 "The number of sink pads", 0, G_MAXUINT, 0, G_PARAM_READABLE));
754 g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD,
755 g_param_spec_object ("active-pad", "Active pad",
756 "The currently active sink pad", GST_TYPE_PAD, G_PARAM_READWRITE));
758 g_object_class_install_property (gobject_class, PROP_SELECT_ALL,
759 g_param_spec_boolean ("select-all", "Select all mode",
760 "Forwards data from all input pads", FALSE, G_PARAM_READWRITE));
763 * GstInputSelector::block:
764 * @inputselector: the #GstInputSelector
766 * Block all sink pads in preparation for a switch. Returns the stop time of
767 * the current switch segment, as a running time, or 0 if there is no current
768 * active pad or the current active pad never received data.
770 gst_input_selector_signals[SIGNAL_BLOCK] =
771 g_signal_new ("block", G_TYPE_FROM_CLASS (klass),
772 G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
773 G_STRUCT_OFFSET (GstInputSelectorClass, block), NULL, NULL,
774 gst_selector_marshal_INT64__VOID, G_TYPE_INT64, 0);
776 * GstInputSelector::switch:
777 * @inputselector: the #GstInputSelector
778 * @pad: the pad to switch to
779 * @stop_time: running time at which to close the previous segment, or -1
780 * to use the running time of the previously active sink pad
781 * @start_time: running time at which to start the new segment, or -1 to
782 * use the running time of the newly active sink pad
784 * Switch to a new feed. The segment opened by the previously active pad, if
785 * any, will be closed, and a new segment opened before data flows again.
787 * This signal must be emitted when the element has been blocked via the <link
788 * linkend="GstInputSelector-block">block</link> signal.
790 * If you have a stream with only one switch element, such as an audio-only
791 * stream, a stream switch should be performed by first emitting the block
792 * signal, and then emitting the switch signal with -1 for the stop and start
795 * The intention of the @stop_time and @start_time arguments is to allow
796 * multiple switch elements to switch and maintain stream synchronization.
797 * When switching a stream with multiple feeds, you will need as many switch
798 * elements as you have feeds. For example, a feed with audio and video will
799 * have one switch element between the audio feeds and one for video.
801 * A switch over multiple switch elements should be performed as follows:
802 * First, emit the <link linkend="GstInputSelector-block">block</link>
803 * signal, collecting the returned values. The maximum running time returned
804 * by block should then be used as the time at which to close the previous
807 * Then, query the running times of the new audio and video pads that you will
808 * switch to. Naturally, these pads are on separate switch elements. Take the
809 * minimum running time for those streams and use it for the time at which to
810 * open the new segment.
812 * If @pad is the same as the current active pad, the element will cancel any
813 * previous block without adjusting segments.
816 * the signal changed from accepting the pad name to the pad object.
821 gst_input_selector_signals[SIGNAL_SWITCH] =
822 g_signal_new ("switch", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
823 G_STRUCT_OFFSET (GstInputSelectorClass, switch_),
824 NULL, NULL, gst_selector_marshal_VOID__OBJECT_INT64_INT64,
825 G_TYPE_NONE, 3, GST_TYPE_PAD, G_TYPE_INT64, G_TYPE_INT64);
827 gstelement_class->request_new_pad = gst_input_selector_request_new_pad;
828 gstelement_class->release_pad = gst_input_selector_release_pad;
829 gstelement_class->change_state = gst_input_selector_change_state;
831 klass->block = GST_DEBUG_FUNCPTR (gst_input_selector_block);
832 /* note the underscore because switch is a keyword otherwise */
833 klass->switch_ = GST_DEBUG_FUNCPTR (gst_input_selector_switch);
837 gst_input_selector_init (GstInputSelector * sel)
839 sel->srcpad = gst_pad_new ("src", GST_PAD_SRC);
840 gst_pad_set_iterate_internal_links_function (sel->srcpad,
841 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
842 gst_pad_set_getcaps_function (sel->srcpad,
843 GST_DEBUG_FUNCPTR (gst_input_selector_getcaps));
844 gst_pad_set_query_function (sel->srcpad,
845 GST_DEBUG_FUNCPTR (gst_input_selector_query));
846 gst_pad_set_event_function (sel->srcpad,
847 GST_DEBUG_FUNCPTR (gst_input_selector_event));
848 gst_element_add_pad (GST_ELEMENT (sel), sel->srcpad);
849 /* sinkpad management */
850 sel->active_sinkpad = NULL;
852 gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED);
854 sel->lock = g_mutex_new ();
855 sel->cond = g_cond_new ();
856 sel->blocked = FALSE;
858 sel->select_all = FALSE;
862 gst_input_selector_dispose (GObject * object)
864 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
866 if (sel->active_sinkpad) {
867 gst_object_unref (sel->active_sinkpad);
868 sel->active_sinkpad = NULL;
871 g_mutex_free (sel->lock);
875 g_cond_free (sel->cond);
879 G_OBJECT_CLASS (parent_class)->dispose (object);
882 /* Solve the following equation for B.timestamp, and set that as the segment
884 * B.running_time = (B.timestamp - NS.start) / NS.abs_rate + NS.accum
887 gst_segment_get_timestamp (GstSegment * segment, gint64 running_time)
889 return (running_time - segment->accum) * segment->abs_rate + segment->start;
893 gst_segment_set_stop (GstSegment * segment, gint64 running_time)
895 segment->stop = gst_segment_get_timestamp (segment, running_time);
896 segment->last_stop = -1;
900 gst_segment_set_start (GstSegment * segment, gint64 running_time)
902 gint64 new_start, duration;
904 new_start = gst_segment_get_timestamp (segment, running_time);
906 /* this is the duration we skipped */
907 duration = new_start - segment->start;
908 /* add the duration to the accumulated segment time */
909 segment->accum += duration;
910 /* move position in the segment */
911 segment->time += duration;
912 segment->start += duration;
915 /* this function must be called with the SELECTOR_LOCK. It returns TRUE when the
916 * active pad changed. */
918 gst_input_selector_set_active_pad (GstInputSelector * self,
919 GstPad * pad, gint64 stop_time, gint64 start_time)
921 GstSelectorPad *old, *new;
922 GstPad **active_pad_p;
924 if (pad == self->active_sinkpad)
927 old = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
928 new = GST_SELECTOR_PAD_CAST (pad);
930 GST_DEBUG_OBJECT (self, "setting active pad to %s:%s",
931 GST_DEBUG_PAD_NAME (new));
933 if (stop_time == -1 && old) {
934 /* no stop time given, get the latest running_time on the active pad to
935 * close and open the new segment */
936 stop_time = start_time = gst_selector_pad_get_running_time (old);
937 GST_DEBUG_OBJECT (self, "using start/stop of %" G_GINT64_FORMAT,
941 if (old && old->active && !self->pending_close && stop_time >= 0) {
942 /* schedule a last_stop update if one isn't already scheduled, and a
943 segment has been pushed before. */
944 memcpy (&self->segment, &old->segment, sizeof (self->segment));
946 GST_DEBUG_OBJECT (self, "setting stop_time to %" G_GINT64_FORMAT,
948 gst_segment_set_stop (&self->segment, stop_time);
949 self->pending_close = TRUE;
952 if (new && new->active && start_time >= 0) {
953 GST_DEBUG_OBJECT (self, "setting start_time to %" G_GINT64_FORMAT,
955 /* schedule a new segment push */
956 gst_segment_set_start (&new->segment, start_time);
957 new->segment_pending = TRUE;
960 active_pad_p = &self->active_sinkpad;
961 gst_object_replace ((GstObject **) active_pad_p, GST_OBJECT_CAST (pad));
962 GST_DEBUG_OBJECT (self, "New active pad is %" GST_PTR_FORMAT,
963 self->active_sinkpad);
969 gst_input_selector_set_property (GObject * object, guint prop_id,
970 const GValue * value, GParamSpec * pspec)
972 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
975 case PROP_ACTIVE_PAD:
979 pad = g_value_get_object (value);
981 GST_INPUT_SELECTOR_LOCK (sel);
982 gst_input_selector_set_active_pad (sel, pad,
983 GST_CLOCK_TIME_NONE, GST_CLOCK_TIME_NONE);
984 GST_INPUT_SELECTOR_UNLOCK (sel);
987 case PROP_SELECT_ALL:
988 GST_INPUT_SELECTOR_LOCK (object);
989 sel->select_all = g_value_get_boolean (value);
990 GST_INPUT_SELECTOR_UNLOCK (object);
993 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
999 gst_input_selector_get_property (GObject * object, guint prop_id,
1000 GValue * value, GParamSpec * pspec)
1002 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
1006 GST_INPUT_SELECTOR_LOCK (object);
1007 g_value_set_uint (value, sel->n_pads);
1008 GST_INPUT_SELECTOR_UNLOCK (object);
1010 case PROP_ACTIVE_PAD:
1011 GST_INPUT_SELECTOR_LOCK (object);
1012 g_value_set_object (value, sel->active_sinkpad);
1013 GST_INPUT_SELECTOR_UNLOCK (object);
1015 case PROP_SELECT_ALL:
1016 GST_INPUT_SELECTOR_LOCK (object);
1017 g_value_set_boolean (value, sel->select_all);
1018 GST_INPUT_SELECTOR_UNLOCK (object);
1021 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1027 gst_input_selector_get_linked_pad (GstPad * pad, gboolean strict)
1029 GstInputSelector *sel;
1030 GstPad *otherpad = NULL;
1032 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
1034 GST_INPUT_SELECTOR_LOCK (sel);
1035 if (pad == sel->srcpad)
1036 otherpad = sel->active_sinkpad;
1037 else if (pad == sel->active_sinkpad || !strict)
1038 otherpad = sel->srcpad;
1040 gst_object_ref (otherpad);
1041 GST_INPUT_SELECTOR_UNLOCK (sel);
1043 gst_object_unref (sel);
1049 gst_input_selector_event (GstPad * pad, GstEvent * event)
1051 gboolean res = FALSE;
1054 otherpad = gst_input_selector_get_linked_pad (pad, TRUE);
1057 res = gst_pad_push_event (otherpad, event);
1059 gst_object_unref (otherpad);
1061 gst_event_unref (event);
1065 /* query on the srcpad. We override this function because by default it will
1066 * only forward the query to one random sinkpad */
1068 gst_input_selector_query (GstPad * pad, GstQuery * query)
1070 gboolean res = TRUE;
1071 GstInputSelector *sel;
1074 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
1076 otherpad = gst_input_selector_get_linked_pad (pad, TRUE);
1078 switch (GST_QUERY_TYPE (query)) {
1079 case GST_QUERY_LATENCY:
1082 GstClockTime resmin, resmax;
1089 /* assume FALSE, we become TRUE if one query succeeds */
1092 /* perform the query on all sinkpads and combine the results. We take the
1093 * max of min and the min of max for the result latency. */
1094 GST_INPUT_SELECTOR_LOCK (sel);
1095 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk;
1096 walk = g_list_next (walk)) {
1097 GstPad *sinkpad = GST_PAD_CAST (walk->data);
1099 if (gst_pad_peer_query (sinkpad, query)) {
1100 GstClockTime min, max;
1103 /* one query succeeded, we succeed too */
1106 gst_query_parse_latency (query, &live, &min, &max);
1108 GST_DEBUG_OBJECT (sinkpad,
1109 "peer latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1110 ", live %d", GST_TIME_ARGS (min), GST_TIME_ARGS (max), live);
1117 else if (max < resmax)
1119 if (reslive == FALSE)
1124 GST_INPUT_SELECTOR_UNLOCK (sel);
1126 gst_query_set_latency (query, reslive, resmin, resmax);
1128 GST_DEBUG_OBJECT (sel,
1129 "total latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1130 ", live %d", GST_TIME_ARGS (resmin), GST_TIME_ARGS (resmax),
1138 res = gst_pad_peer_query (otherpad, query);
1142 gst_object_unref (otherpad);
1143 gst_object_unref (sel);
1149 gst_input_selector_getcaps (GstPad * pad)
1155 parent = gst_object_get_parent (GST_OBJECT (pad));
1157 otherpad = gst_input_selector_get_linked_pad (pad, FALSE);
1160 if (GST_INPUT_SELECTOR (parent)->select_all) {
1161 GST_DEBUG_OBJECT (parent,
1162 "Pad %s:%s not linked, returning merge of caps",
1163 GST_DEBUG_PAD_NAME (pad));
1164 caps = gst_pad_proxy_getcaps (pad);
1166 GST_DEBUG_OBJECT (parent,
1167 "Pad %s:%s not linked, returning ANY", GST_DEBUG_PAD_NAME (pad));
1168 caps = gst_caps_new_any ();
1171 GST_DEBUG_OBJECT (parent,
1172 "Pad %s:%s is linked (to %s:%s), returning peer caps",
1173 GST_DEBUG_PAD_NAME (pad), GST_DEBUG_PAD_NAME (otherpad));
1174 /* if the peer has caps, use those. If the pad is not linked, this function
1175 * returns NULL and we return ANY */
1176 if (!(caps = gst_pad_peer_get_caps (otherpad)))
1177 caps = gst_caps_new_any ();
1178 gst_object_unref (otherpad);
1181 gst_object_unref (parent);
1185 /* check if the pad is the active sinkpad */
1187 gst_input_selector_is_active_sinkpad (GstInputSelector * sel, GstPad * pad)
1189 GstSelectorPad *selpad;
1192 selpad = GST_SELECTOR_PAD_CAST (pad);
1194 GST_INPUT_SELECTOR_LOCK (sel);
1195 res = (pad == sel->active_sinkpad);
1196 GST_INPUT_SELECTOR_UNLOCK (sel);
1201 /* Get or create the active sinkpad, must be called with SELECTOR_LOCK */
1203 gst_input_selector_activate_sinkpad (GstInputSelector * sel, GstPad * pad)
1205 GstPad *active_sinkpad;
1206 GstSelectorPad *selpad;
1208 selpad = GST_SELECTOR_PAD_CAST (pad);
1210 selpad->active = TRUE;
1211 active_sinkpad = sel->active_sinkpad;
1212 if (active_sinkpad == NULL || sel->select_all) {
1213 /* first pad we get activity on becomes the activated pad by default, if we
1214 * select all, we also remember the last used pad. */
1215 if (sel->active_sinkpad)
1216 gst_object_unref (sel->active_sinkpad);
1217 active_sinkpad = sel->active_sinkpad = gst_object_ref (pad);
1218 GST_DEBUG_OBJECT (sel, "Activating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1221 return active_sinkpad;
1225 gst_input_selector_request_new_pad (GstElement * element,
1226 GstPadTemplate * templ, const gchar * unused)
1228 GstInputSelector *sel;
1230 GstPad *sinkpad = NULL;
1232 g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL);
1234 sel = GST_INPUT_SELECTOR (element);
1236 GST_INPUT_SELECTOR_LOCK (sel);
1238 GST_LOG_OBJECT (sel, "Creating new pad %d", sel->padcount);
1239 name = g_strdup_printf ("sink%d", sel->padcount++);
1240 sinkpad = g_object_new (GST_TYPE_SELECTOR_PAD,
1241 "name", name, "direction", templ->direction, "template", templ, NULL);
1246 gst_pad_set_event_function (sinkpad,
1247 GST_DEBUG_FUNCPTR (gst_selector_pad_event));
1248 gst_pad_set_getcaps_function (sinkpad,
1249 GST_DEBUG_FUNCPTR (gst_selector_pad_getcaps));
1250 gst_pad_set_chain_function (sinkpad,
1251 GST_DEBUG_FUNCPTR (gst_selector_pad_chain));
1252 gst_pad_set_iterate_internal_links_function (sinkpad,
1253 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
1254 gst_pad_set_bufferalloc_function (sinkpad,
1255 GST_DEBUG_FUNCPTR (gst_selector_pad_bufferalloc));
1257 gst_pad_set_active (sinkpad, TRUE);
1258 gst_element_add_pad (GST_ELEMENT (sel), sinkpad);
1259 GST_INPUT_SELECTOR_UNLOCK (sel);
1265 gst_input_selector_release_pad (GstElement * element, GstPad * pad)
1267 GstInputSelector *sel;
1269 sel = GST_INPUT_SELECTOR (element);
1270 GST_LOG_OBJECT (sel, "Releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1272 GST_INPUT_SELECTOR_LOCK (sel);
1273 /* if the pad was the active pad, makes us select a new one */
1274 if (sel->active_sinkpad == pad) {
1275 GST_DEBUG_OBJECT (sel, "Deactivating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1276 gst_object_unref (sel->active_sinkpad);
1277 sel->active_sinkpad = NULL;
1281 gst_pad_set_active (pad, FALSE);
1282 gst_element_remove_pad (GST_ELEMENT (sel), pad);
1283 GST_INPUT_SELECTOR_UNLOCK (sel);
1287 gst_input_selector_reset (GstInputSelector * sel)
1291 GST_INPUT_SELECTOR_LOCK (sel);
1292 /* clear active pad */
1293 if (sel->active_sinkpad) {
1294 gst_object_unref (sel->active_sinkpad);
1295 sel->active_sinkpad = NULL;
1298 gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED);
1299 sel->pending_close = FALSE;
1300 /* reset each of our sinkpads state */
1301 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
1302 GstSelectorPad *selpad = GST_SELECTOR_PAD_CAST (walk->data);
1304 gst_selector_pad_reset (selpad);
1307 gst_tag_list_free (selpad->tags);
1308 selpad->tags = NULL;
1311 GST_INPUT_SELECTOR_UNLOCK (sel);
1314 static GstStateChangeReturn
1315 gst_input_selector_change_state (GstElement * element,
1316 GstStateChange transition)
1318 GstInputSelector *self = GST_INPUT_SELECTOR (element);
1319 GstStateChangeReturn result;
1321 switch (transition) {
1322 case GST_STATE_CHANGE_READY_TO_PAUSED:
1323 GST_INPUT_SELECTOR_LOCK (self);
1324 self->blocked = FALSE;
1325 self->flushing = FALSE;
1326 GST_INPUT_SELECTOR_UNLOCK (self);
1328 case GST_STATE_CHANGE_PAUSED_TO_READY:
1329 /* first unlock before we call the parent state change function, which
1330 * tries to acquire the stream lock when going to ready. */
1331 GST_INPUT_SELECTOR_LOCK (self);
1332 self->blocked = FALSE;
1333 self->flushing = TRUE;
1334 GST_INPUT_SELECTOR_BROADCAST (self);
1335 GST_INPUT_SELECTOR_UNLOCK (self);
1341 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1343 switch (transition) {
1344 case GST_STATE_CHANGE_PAUSED_TO_READY:
1345 gst_input_selector_reset (self);
1355 gst_input_selector_block (GstInputSelector * self)
1358 GstSelectorPad *spad;
1360 GST_INPUT_SELECTOR_LOCK (self);
1363 GST_WARNING_OBJECT (self, "switch already blocked");
1365 self->blocked = TRUE;
1366 spad = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
1369 ret = gst_selector_pad_get_running_time (spad);
1371 GST_DEBUG_OBJECT (self, "no active pad while blocking");
1373 GST_INPUT_SELECTOR_UNLOCK (self);
1378 /* stop_time and start_time are running times */
1380 gst_input_selector_switch (GstInputSelector * self, GstPad * pad,
1381 gint64 stop_time, gint64 start_time)
1385 g_return_if_fail (self->blocked == TRUE);
1387 GST_INPUT_SELECTOR_LOCK (self);
1389 gst_input_selector_set_active_pad (self, pad, stop_time, start_time);
1391 self->blocked = FALSE;
1392 GST_INPUT_SELECTOR_BROADCAST (self);
1393 GST_INPUT_SELECTOR_UNLOCK (self);
1396 g_object_notify (G_OBJECT (self), "active-pad");
1400 gst_input_selector_check_eos (GstElement * selector)
1402 GstIterator *it = gst_element_iterate_sink_pads (selector);
1403 GstIteratorResult ires;
1405 gboolean done = FALSE, is_eos = FALSE;
1406 GstSelectorPad *pad;
1409 ires = gst_iterator_next (it, &item);
1411 case GST_ITERATOR_DONE:
1412 GST_INFO_OBJECT (selector, "all sink pads have eos");
1416 case GST_ITERATOR_OK:
1417 pad = GST_SELECTOR_PAD_CAST (item);
1421 gst_object_unref (pad);
1423 case GST_ITERATOR_RESYNC:
1424 gst_iterator_resync (it);
1431 gst_iterator_free (it);