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
60 #include "gstinputselector.h"
62 #include "gst/glib-compat-private.h"
64 GST_DEBUG_CATEGORY_STATIC (input_selector_debug);
65 #define GST_CAT_DEFAULT input_selector_debug
67 static GstStaticPadTemplate gst_input_selector_sink_factory =
68 GST_STATIC_PAD_TEMPLATE ("sink_%u",
73 static GstStaticPadTemplate gst_input_selector_src_factory =
74 GST_STATIC_PAD_TEMPLATE ("src",
87 #define DEFAULT_SYNC_STREAMS FALSE
89 #define DEFAULT_PAD_ALWAYS_OK TRUE
94 PROP_PAD_RUNNING_TIME,
107 static guint gst_input_selector_signals[LAST_SIGNAL] = { 0 };
109 static inline gboolean gst_input_selector_is_active_sinkpad (GstInputSelector *
111 static GstPad *gst_input_selector_activate_sinkpad (GstInputSelector * sel,
113 static GstPad *gst_input_selector_get_linked_pad (GstInputSelector * sel,
114 GstPad * pad, gboolean strict);
116 #define GST_TYPE_SELECTOR_PAD \
117 (gst_selector_pad_get_type())
118 #define GST_SELECTOR_PAD(obj) \
119 (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_SELECTOR_PAD, GstSelectorPad))
120 #define GST_SELECTOR_PAD_CLASS(klass) \
121 (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_SELECTOR_PAD, GstSelectorPadClass))
122 #define GST_IS_SELECTOR_PAD(obj) \
123 (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_SELECTOR_PAD))
124 #define GST_IS_SELECTOR_PAD_CLASS(klass) \
125 (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_SELECTOR_PAD))
126 #define GST_SELECTOR_PAD_CAST(obj) \
127 ((GstSelectorPad *)(obj))
129 typedef struct _GstSelectorPad GstSelectorPad;
130 typedef struct _GstSelectorPadClass GstSelectorPadClass;
132 struct _GstSelectorPad
136 gboolean active; /* when buffer have passed the pad */
137 gboolean pushed; /* when buffer was pushed downstream since activation */
138 gboolean eos; /* when EOS has been received */
139 gboolean eos_sent; /* when EOS was sent downstream */
140 gboolean discont; /* after switching we create a discont */
141 gboolean flushing; /* set after flush-start and before flush-stop */
143 GstTagList *tags; /* last tags received on the pad */
145 GstClockTime position; /* the current position in the segment */
146 GstSegment segment; /* the current segment on the pad */
147 guint32 segment_seqnum; /* sequence number of the current segment */
149 gboolean segment_pending;
152 struct _GstSelectorPadClass
157 GType gst_selector_pad_get_type (void);
158 static void gst_selector_pad_finalize (GObject * object);
159 static void gst_selector_pad_get_property (GObject * object,
160 guint prop_id, GValue * value, GParamSpec * pspec);
161 static void gst_selector_pad_set_property (GObject * object,
162 guint prop_id, const GValue * value, GParamSpec * pspec);
164 static gint64 gst_selector_pad_get_running_time (GstSelectorPad * pad);
165 static void gst_selector_pad_reset (GstSelectorPad * pad);
166 static gboolean gst_selector_pad_event (GstPad * pad, GstObject * parent,
168 static gboolean gst_selector_pad_query (GstPad * pad, GstObject * parent,
170 static GstIterator *gst_selector_pad_iterate_linked_pads (GstPad * pad,
172 static GstFlowReturn gst_selector_pad_chain (GstPad * pad, GstObject * parent,
175 G_DEFINE_TYPE (GstSelectorPad, gst_selector_pad, GST_TYPE_PAD);
178 gst_selector_pad_class_init (GstSelectorPadClass * klass)
180 GObjectClass *gobject_class;
182 gobject_class = (GObjectClass *) klass;
184 gobject_class->finalize = gst_selector_pad_finalize;
186 gobject_class->get_property = gst_selector_pad_get_property;
187 gobject_class->set_property = gst_selector_pad_set_property;
189 g_object_class_install_property (gobject_class, PROP_PAD_RUNNING_TIME,
190 g_param_spec_int64 ("running-time", "Running time",
191 "Running time of stream on pad", 0, G_MAXINT64, 0,
192 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
193 g_object_class_install_property (gobject_class, PROP_PAD_TAGS,
194 g_param_spec_boxed ("tags", "Tags",
195 "The currently active tags on the pad", GST_TYPE_TAG_LIST,
196 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
197 g_object_class_install_property (gobject_class, PROP_PAD_ACTIVE,
198 g_param_spec_boolean ("active", "Active",
199 "If the pad is currently active", FALSE,
200 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
201 /* FIXME: better property name? */
202 g_object_class_install_property (gobject_class, PROP_PAD_ALWAYS_OK,
203 g_param_spec_boolean ("always-ok", "Always OK",
204 "Make an inactive pad return OK instead of NOT_LINKED",
205 DEFAULT_PAD_ALWAYS_OK, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
209 gst_selector_pad_init (GstSelectorPad * pad)
211 pad->always_ok = DEFAULT_PAD_ALWAYS_OK;
212 gst_selector_pad_reset (pad);
216 gst_selector_pad_finalize (GObject * object)
220 pad = GST_SELECTOR_PAD_CAST (object);
223 gst_tag_list_free (pad->tags);
225 G_OBJECT_CLASS (gst_selector_pad_parent_class)->finalize (object);
229 gst_selector_pad_set_property (GObject * object, guint prop_id,
230 const GValue * value, GParamSpec * pspec)
232 GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
235 case PROP_PAD_ALWAYS_OK:
236 GST_OBJECT_LOCK (object);
237 spad->always_ok = g_value_get_boolean (value);
238 GST_OBJECT_UNLOCK (object);
241 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
247 gst_selector_pad_get_property (GObject * object, guint prop_id,
248 GValue * value, GParamSpec * pspec)
250 GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
253 case PROP_PAD_RUNNING_TIME:
254 g_value_set_int64 (value, gst_selector_pad_get_running_time (spad));
257 GST_OBJECT_LOCK (object);
258 g_value_set_boxed (value, spad->tags);
259 GST_OBJECT_UNLOCK (object);
261 case PROP_PAD_ACTIVE:
263 GstInputSelector *sel;
265 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (spad));
266 g_value_set_boolean (value, gst_input_selector_is_active_sinkpad (sel,
267 GST_PAD_CAST (spad)));
268 gst_object_unref (sel);
271 case PROP_PAD_ALWAYS_OK:
272 GST_OBJECT_LOCK (object);
273 g_value_set_boolean (value, spad->always_ok);
274 GST_OBJECT_UNLOCK (object);
277 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
283 gst_selector_pad_get_running_time (GstSelectorPad * pad)
287 GST_OBJECT_LOCK (pad);
289 guint64 position = pad->position;
290 GstFormat format = pad->segment.format;
292 ret = gst_segment_to_running_time (&pad->segment, format, position);
294 GST_OBJECT_UNLOCK (pad);
296 GST_DEBUG_OBJECT (pad, "running time: %" GST_TIME_FORMAT,
297 GST_TIME_ARGS (ret));
303 gst_selector_pad_reset (GstSelectorPad * pad)
305 GST_OBJECT_LOCK (pad);
309 pad->eos_sent = FALSE;
310 pad->segment_pending = FALSE;
311 pad->discont = FALSE;
312 pad->flushing = FALSE;
313 pad->position = GST_CLOCK_TIME_NONE;
314 gst_segment_init (&pad->segment, GST_FORMAT_UNDEFINED);
315 GST_OBJECT_UNLOCK (pad);
318 /* strictly get the linked pad from the sinkpad. If the pad is active we return
319 * the srcpad else we return NULL */
321 gst_selector_pad_iterate_linked_pads (GstPad * pad, GstObject * parent)
323 GstInputSelector *sel;
325 GstIterator *it = NULL;
328 sel = GST_INPUT_SELECTOR (parent);
330 otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE);
332 g_value_init (&val, GST_TYPE_PAD);
333 g_value_set_object (&val, otherpad);
334 it = gst_iterator_new_single (GST_TYPE_PAD, &val);
335 g_value_unset (&val);
336 gst_object_unref (otherpad);
343 gst_selector_pad_event (GstPad * pad, GstObject * parent, GstEvent * event)
347 GstInputSelector *sel;
348 GstSelectorPad *selpad;
349 GstPad *prev_active_sinkpad;
350 GstPad *active_sinkpad;
352 sel = GST_INPUT_SELECTOR (parent);
353 selpad = GST_SELECTOR_PAD_CAST (pad);
355 GST_INPUT_SELECTOR_LOCK (sel);
356 prev_active_sinkpad = sel->active_sinkpad;
357 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
359 /* only forward if we are dealing with the active sinkpad */
360 forward = (pad == active_sinkpad);
361 GST_INPUT_SELECTOR_UNLOCK (sel);
363 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) {
364 g_object_notify (G_OBJECT (sel), "active-pad");
367 switch (GST_EVENT_TYPE (event)) {
368 case GST_EVENT_FLUSH_START:
369 /* Unblock the pad if it's waiting */
370 GST_INPUT_SELECTOR_LOCK (sel);
371 selpad->flushing = TRUE;
372 GST_INPUT_SELECTOR_BROADCAST (sel);
373 GST_INPUT_SELECTOR_UNLOCK (sel);
375 case GST_EVENT_FLUSH_STOP:
376 GST_INPUT_SELECTOR_LOCK (sel);
377 gst_selector_pad_reset (selpad);
378 GST_INPUT_SELECTOR_UNLOCK (sel);
380 case GST_EVENT_SEGMENT:
382 GST_INPUT_SELECTOR_LOCK (sel);
383 GST_OBJECT_LOCK (selpad);
384 gst_event_copy_segment (event, &selpad->segment);
385 selpad->segment_seqnum = gst_event_get_seqnum (event);
387 /* Update the position */
388 if (selpad->position == GST_CLOCK_TIME_NONE
389 || selpad->segment.position > selpad->position) {
390 selpad->position = selpad->segment.position;
391 } else if (selpad->position != GST_CLOCK_TIME_NONE
392 && selpad->position > selpad->segment.position) {
393 selpad->segment.position = selpad->position;
396 gst_event_unref (event);
397 event = gst_event_new_segment (&selpad->segment);
398 gst_event_set_seqnum (event, selpad->segment_seqnum);
401 GST_DEBUG_OBJECT (pad, "configured SEGMENT %" GST_SEGMENT_FORMAT,
404 /* If we aren't forwarding the event because the pad is not the
405 * active_sinkpad, then set the flag on the pad
406 * that says a segment needs sending if/when that pad is activated.
407 * For all other cases, we send the event immediately, which makes
408 * sparse streams and other segment updates work correctly downstream.
411 selpad->segment_pending = TRUE;
413 GST_OBJECT_UNLOCK (selpad);
414 GST_INPUT_SELECTOR_UNLOCK (sel);
419 GstTagList *tags, *oldtags, *newtags;
421 gst_event_parse_tag (event, &tags);
423 GST_OBJECT_LOCK (selpad);
424 oldtags = selpad->tags;
426 newtags = gst_tag_list_merge (oldtags, tags, GST_TAG_MERGE_REPLACE);
427 selpad->tags = newtags;
429 gst_tag_list_free (oldtags);
430 GST_DEBUG_OBJECT (pad, "received tags %" GST_PTR_FORMAT, newtags);
431 GST_OBJECT_UNLOCK (selpad);
433 g_object_notify (G_OBJECT (selpad), "tags");
440 selpad->eos_sent = TRUE;
444 /* If the active sinkpad is in EOS state but EOS
445 * was not sent downstream this means that the pad
446 * got EOS before it was set as active pad and that
447 * the previously active pad got EOS after it was
450 GST_INPUT_SELECTOR_LOCK (sel);
451 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
452 tmp = GST_SELECTOR_PAD (active_sinkpad);
453 forward = (tmp->eos && !tmp->eos_sent);
454 tmp->eos_sent = TRUE;
455 GST_INPUT_SELECTOR_UNLOCK (sel);
457 GST_DEBUG_OBJECT (pad, "received EOS");
463 GST_DEBUG_OBJECT (pad, "forwarding event");
464 res = gst_pad_push_event (sel->srcpad, event);
466 gst_event_unref (event);
472 gst_selector_pad_query (GstPad * pad, GstObject * parent, GstQuery * query)
474 gboolean res = FALSE;
476 switch (GST_QUERY_TYPE (query)) {
478 res = gst_pad_query_default (pad, parent, query);
485 /* must be called with the SELECTOR_LOCK, will block while the pad is blocked
486 * or return TRUE when flushing */
488 gst_input_selector_wait (GstInputSelector * self, GstSelectorPad * pad)
490 while (self->blocked && !self->flushing && !pad->flushing) {
491 /* we can be unlocked here when we are shutting down (flushing) or when we
493 GST_INPUT_SELECTOR_WAIT (self);
495 return self->flushing;
498 /* must be called with the SELECTOR_LOCK, will block until the running time
499 * of the active pad is after this pad or return TRUE when flushing */
501 gst_input_selector_wait_running_time (GstInputSelector * sel,
502 GstSelectorPad * pad, GstBuffer * buf)
504 GstPad *active_sinkpad;
505 GstSelectorPad *active_selpad;
506 GstSegment *seg, *active_seg;
507 GstClockTime running_time, active_running_time = GST_CLOCK_TIME_NONE;
512 gst_input_selector_activate_sinkpad (sel, GST_PAD_CAST (pad));
513 active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad);
514 active_seg = &active_selpad->segment;
516 /* We can only sync if the segments are in time format or
517 * if the active pad had no newsegment event yet */
518 if (seg->format != GST_FORMAT_TIME ||
519 (active_seg->format != GST_FORMAT_TIME
520 && active_seg->format != GST_FORMAT_UNDEFINED))
523 /* If we have no valid timestamp we can't sync this buffer */
524 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buf))
527 running_time = GST_BUFFER_TIMESTAMP (buf);
528 /* If possible try to get the running time at the end of the buffer */
529 if (GST_BUFFER_DURATION_IS_VALID (buf))
530 running_time += GST_BUFFER_DURATION (buf);
531 if (running_time > seg->stop)
532 running_time = seg->stop;
534 gst_segment_to_running_time (seg, GST_FORMAT_TIME, running_time);
535 /* If this is outside the segment don't sync */
536 if (running_time == -1)
539 /* Get active pad's running time, if no configured segment yet keep at -1 */
540 if (active_seg->format == GST_FORMAT_TIME)
541 active_running_time =
542 gst_segment_to_running_time (active_seg, GST_FORMAT_TIME,
543 active_selpad->position);
546 * a) this is the active pad
547 * b) the pad or the selector is flushing
548 * c) the selector is not blocked
549 * d) the active pad has no running time or the active
550 * pad's running time is before this running time
551 * e) the active pad has a non-time segment
553 while (pad != active_selpad && !sel->flushing && !pad->flushing &&
554 (sel->blocked || active_running_time == -1
555 || running_time >= active_running_time)) {
557 GST_DEBUG_OBJECT (pad,
558 "Waiting for active streams to advance. %" GST_TIME_FORMAT " >= %"
559 GST_TIME_FORMAT, GST_TIME_ARGS (running_time),
560 GST_TIME_ARGS (active_running_time));
562 GST_INPUT_SELECTOR_WAIT (sel);
564 /* Get new active pad, it might have changed */
566 gst_input_selector_activate_sinkpad (sel, GST_PAD_CAST (pad));
567 active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad);
568 active_seg = &active_selpad->segment;
570 /* If the active segment is configured but not to time format
571 * we can't do any syncing at all */
572 if (active_seg->format != GST_FORMAT_TIME
573 && active_seg->format != GST_FORMAT_UNDEFINED)
576 /* Get the new active pad running time */
577 if (active_seg->format == GST_FORMAT_TIME)
578 active_running_time =
579 gst_segment_to_running_time (active_seg, GST_FORMAT_TIME,
580 active_selpad->position);
582 active_running_time = -1;
585 GST_DEBUG_OBJECT (pad,
586 "Waited for active streams to advance. %" GST_TIME_FORMAT " >= %"
587 GST_TIME_FORMAT, GST_TIME_ARGS (running_time),
588 GST_TIME_ARGS (active_running_time));
592 /* Return TRUE if the selector or the pad is flushing */
593 return (sel->flushing || pad->flushing);
598 gst_selector_pad_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
600 GstInputSelector *sel;
602 GstPad *active_sinkpad;
603 GstPad *prev_active_sinkpad;
604 GstSelectorPad *selpad;
605 GstClockTime start_time;
607 GstEvent *start_event = NULL;
609 sel = GST_INPUT_SELECTOR (parent);
610 selpad = GST_SELECTOR_PAD_CAST (pad);
611 seg = &selpad->segment;
613 GST_INPUT_SELECTOR_LOCK (sel);
614 /* wait or check for flushing */
615 if (gst_input_selector_wait (sel, selpad))
618 GST_LOG_OBJECT (pad, "getting active pad");
620 prev_active_sinkpad = sel->active_sinkpad;
621 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
623 /* In sync mode wait until the active pad has advanced
624 * after the running time of the current buffer */
625 if (sel->sync_streams && active_sinkpad != pad) {
626 if (gst_input_selector_wait_running_time (sel, selpad, buf))
630 /* Might have changed while waiting */
631 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
633 /* update the segment on the srcpad */
634 start_time = GST_BUFFER_TIMESTAMP (buf);
635 if (GST_CLOCK_TIME_IS_VALID (start_time)) {
636 GST_LOG_OBJECT (pad, "received start time %" GST_TIME_FORMAT,
637 GST_TIME_ARGS (start_time));
638 if (GST_BUFFER_DURATION_IS_VALID (buf))
639 GST_LOG_OBJECT (pad, "received end time %" GST_TIME_FORMAT,
640 GST_TIME_ARGS (start_time + GST_BUFFER_DURATION (buf)));
642 GST_OBJECT_LOCK (pad);
643 selpad->position = start_time;
644 GST_OBJECT_UNLOCK (pad);
647 /* Ignore buffers from pads except the selected one */
648 if (pad != active_sinkpad)
651 /* Tell all non-active pads that we advanced the running time */
652 if (sel->sync_streams)
653 GST_INPUT_SELECTOR_BROADCAST (sel);
655 /* if we have a pending segment, push it out now */
656 if (G_UNLIKELY (prev_active_sinkpad != active_sinkpad
657 || selpad->segment_pending)) {
658 if (G_UNLIKELY (seg->format == GST_FORMAT_UNDEFINED)) {
659 GST_ERROR_OBJECT (pad, "Buffers arrived before NEWSEGMENT event");
661 GST_DEBUG_OBJECT (pad,
662 "pushing pending NEWSEGMENT update %d, rate %lf, applied rate %lf, "
663 "format %d, " "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
664 G_GINT64_FORMAT, FALSE, seg->rate, seg->applied_rate, seg->format,
665 seg->start, seg->stop, seg->time);
667 start_event = gst_event_new_segment (seg);
668 gst_event_set_seqnum (start_event, selpad->segment_seqnum);
669 selpad->segment_pending = FALSE;
672 GST_INPUT_SELECTOR_UNLOCK (sel);
674 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) {
675 g_object_notify (G_OBJECT (sel), "active-pad");
679 gst_pad_push_event (sel->srcpad, start_event);
681 if (selpad->discont) {
682 buf = gst_buffer_make_writable (buf);
684 GST_DEBUG_OBJECT (pad, "Marking discont buffer %p", buf);
685 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
686 selpad->discont = FALSE;
690 GST_LOG_OBJECT (pad, "Forwarding buffer %p", buf);
692 res = gst_pad_push (sel->srcpad, buf);
693 selpad->pushed = TRUE;
698 /* dropped buffers */
701 gboolean active_pad_pushed = GST_SELECTOR_PAD_CAST (active_sinkpad)->pushed;
703 GST_DEBUG_OBJECT (pad, "Pad not active, discard buffer %p", buf);
704 /* when we drop a buffer, we're creating a discont on this pad */
705 selpad->discont = TRUE;
706 GST_INPUT_SELECTOR_UNLOCK (sel);
707 gst_buffer_unref (buf);
709 /* figure out what to return upstream */
710 GST_OBJECT_LOCK (selpad);
711 if (selpad->always_ok || !active_pad_pushed)
714 res = GST_FLOW_NOT_LINKED;
715 GST_OBJECT_UNLOCK (selpad);
721 GST_DEBUG_OBJECT (pad, "We are flushing, discard buffer %p", buf);
722 GST_INPUT_SELECTOR_UNLOCK (sel);
723 gst_buffer_unref (buf);
724 res = GST_FLOW_WRONG_STATE;
729 static void gst_input_selector_dispose (GObject * object);
730 static void gst_input_selector_finalize (GObject * object);
732 static void gst_input_selector_set_property (GObject * object,
733 guint prop_id, const GValue * value, GParamSpec * pspec);
734 static void gst_input_selector_get_property (GObject * object,
735 guint prop_id, GValue * value, GParamSpec * pspec);
737 static GstPad *gst_input_selector_request_new_pad (GstElement * element,
738 GstPadTemplate * templ, const gchar * unused, const GstCaps * caps);
739 static void gst_input_selector_release_pad (GstElement * element, GstPad * pad);
741 static GstStateChangeReturn gst_input_selector_change_state (GstElement *
742 element, GstStateChange transition);
744 static gboolean gst_input_selector_event (GstPad * pad, GstObject * parent,
746 static gboolean gst_input_selector_query (GstPad * pad, GstObject * parent,
748 static gint64 gst_input_selector_block (GstInputSelector * self);
750 /* FIXME: create these marshallers using glib-genmarshal */
752 gst_input_selector_marshal_INT64__VOID (GClosure * closure,
753 GValue * return_value G_GNUC_UNUSED,
754 guint n_param_values,
755 const GValue * param_values,
756 gpointer invocation_hint G_GNUC_UNUSED, gpointer marshal_data)
758 typedef gint64 (*GMarshalFunc_INT64__VOID) (gpointer data1, gpointer data2);
759 register GMarshalFunc_INT64__VOID callback;
760 register GCClosure *cc = (GCClosure *) closure;
761 register gpointer data1, data2;
764 g_return_if_fail (return_value != NULL);
765 g_return_if_fail (n_param_values == 1);
767 if (G_CCLOSURE_SWAP_DATA (closure)) {
768 data1 = closure->data;
769 data2 = g_value_peek_pointer (param_values + 0);
771 data1 = g_value_peek_pointer (param_values + 0);
772 data2 = closure->data;
775 (GMarshalFunc_INT64__VOID) (marshal_data ? marshal_data : cc->callback);
777 v_return = callback (data1, data2);
779 g_value_set_int64 (return_value, v_return);
783 GST_DEBUG_CATEGORY_INIT (input_selector_debug, \
784 "input-selector", 0, "An input stream selector element");
785 #define gst_input_selector_parent_class parent_class
786 G_DEFINE_TYPE_WITH_CODE (GstInputSelector, gst_input_selector, GST_TYPE_ELEMENT,
790 gst_input_selector_class_init (GstInputSelectorClass * klass)
792 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
793 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
795 gobject_class->dispose = gst_input_selector_dispose;
796 gobject_class->finalize = gst_input_selector_finalize;
798 gobject_class->set_property = gst_input_selector_set_property;
799 gobject_class->get_property = gst_input_selector_get_property;
801 g_object_class_install_property (gobject_class, PROP_N_PADS,
802 g_param_spec_uint ("n-pads", "Number of Pads",
803 "The number of sink pads", 0, G_MAXUINT, 0,
804 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
806 g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD,
807 g_param_spec_object ("active-pad", "Active pad",
808 "The currently active sink pad", GST_TYPE_PAD,
809 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
812 * GstInputSelector:sync-streams
814 * If set to %TRUE all inactive streams will be synced to the
815 * running time of the active stream. This makes sure that no
816 * buffers are dropped by input-selector that might be needed
817 * when switching the active pad.
821 g_object_class_install_property (gobject_class, PROP_SYNC_STREAMS,
822 g_param_spec_boolean ("sync-streams", "Sync Streams",
823 "Synchronize inactive streams to the running time of the active stream",
824 DEFAULT_SYNC_STREAMS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
827 * GstInputSelector::block:
828 * @inputselector: the #GstInputSelector
830 * Block all sink pads in preparation for a switch. Returns the stop time of
831 * the current switch segment, as a running time, or 0 if there is no current
832 * active pad or the current active pad never received data.
834 gst_input_selector_signals[SIGNAL_BLOCK] =
835 g_signal_new ("block", G_TYPE_FROM_CLASS (klass),
836 G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
837 G_STRUCT_OFFSET (GstInputSelectorClass, block), NULL, NULL,
838 gst_input_selector_marshal_INT64__VOID, G_TYPE_INT64, 0);
840 gst_element_class_set_details_simple (gstelement_class, "Input selector",
841 "Generic", "N-to-1 input stream selector",
842 "Julien Moutte <julien@moutte.net>, "
843 "Jan Schmidt <thaytan@mad.scientist.com>, "
844 "Wim Taymans <wim.taymans@gmail.com>");
845 gst_element_class_add_pad_template (gstelement_class,
846 gst_static_pad_template_get (&gst_input_selector_sink_factory));
847 gst_element_class_add_pad_template (gstelement_class,
848 gst_static_pad_template_get (&gst_input_selector_src_factory));
850 gstelement_class->request_new_pad = gst_input_selector_request_new_pad;
851 gstelement_class->release_pad = gst_input_selector_release_pad;
852 gstelement_class->change_state = gst_input_selector_change_state;
854 klass->block = GST_DEBUG_FUNCPTR (gst_input_selector_block);
858 gst_input_selector_init (GstInputSelector * sel)
860 sel->srcpad = gst_pad_new ("src", GST_PAD_SRC);
861 gst_pad_set_iterate_internal_links_function (sel->srcpad,
862 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
863 gst_pad_set_query_function (sel->srcpad,
864 GST_DEBUG_FUNCPTR (gst_input_selector_query));
865 gst_pad_set_event_function (sel->srcpad,
866 GST_DEBUG_FUNCPTR (gst_input_selector_event));
867 GST_OBJECT_FLAG_SET (sel->srcpad, GST_PAD_FLAG_PROXY_CAPS);
868 gst_element_add_pad (GST_ELEMENT (sel), sel->srcpad);
869 /* sinkpad management */
870 sel->active_sinkpad = NULL;
872 sel->sync_streams = DEFAULT_SYNC_STREAMS;
874 g_mutex_init (&sel->lock);
875 g_cond_init (&sel->cond);
876 sel->blocked = FALSE;
880 gst_input_selector_dispose (GObject * object)
882 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
884 if (sel->active_sinkpad) {
885 gst_object_unref (sel->active_sinkpad);
886 sel->active_sinkpad = NULL;
888 G_OBJECT_CLASS (parent_class)->dispose (object);
892 gst_input_selector_finalize (GObject * object)
894 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
896 g_mutex_clear (&sel->lock);
897 g_cond_clear (&sel->cond);
899 G_OBJECT_CLASS (parent_class)->finalize (object);
902 /* this function must be called with the SELECTOR_LOCK. It returns TRUE when the
903 * active pad changed. */
905 gst_input_selector_set_active_pad (GstInputSelector * self, GstPad * pad)
907 GstSelectorPad *old, *new;
908 GstPad **active_pad_p;
910 if (pad == self->active_sinkpad)
913 old = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
914 new = GST_SELECTOR_PAD_CAST (pad);
916 GST_DEBUG_OBJECT (self, "setting active pad to %s:%s",
917 GST_DEBUG_PAD_NAME (new));
924 /* Send a new SEGMENT event on the new pad next */
925 if (old != new && new)
926 new->segment_pending = TRUE;
928 active_pad_p = &self->active_sinkpad;
929 gst_object_replace ((GstObject **) active_pad_p, GST_OBJECT_CAST (pad));
931 /* Wake up all non-active pads in sync mode, they might be
932 * the active pad now */
933 if (self->sync_streams)
934 GST_INPUT_SELECTOR_BROADCAST (self);
936 GST_DEBUG_OBJECT (self, "New active pad is %" GST_PTR_FORMAT,
937 self->active_sinkpad);
943 gst_input_selector_set_property (GObject * object, guint prop_id,
944 const GValue * value, GParamSpec * pspec)
946 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
949 case PROP_ACTIVE_PAD:
953 pad = g_value_get_object (value);
955 GST_INPUT_SELECTOR_LOCK (sel);
956 gst_input_selector_set_active_pad (sel, pad);
957 GST_INPUT_SELECTOR_UNLOCK (sel);
960 case PROP_SYNC_STREAMS:
962 GST_INPUT_SELECTOR_LOCK (sel);
963 sel->sync_streams = g_value_get_boolean (value);
964 GST_INPUT_SELECTOR_UNLOCK (sel);
968 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
974 gst_input_selector_get_property (GObject * object, guint prop_id,
975 GValue * value, GParamSpec * pspec)
977 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
981 GST_INPUT_SELECTOR_LOCK (object);
982 g_value_set_uint (value, sel->n_pads);
983 GST_INPUT_SELECTOR_UNLOCK (object);
985 case PROP_ACTIVE_PAD:
986 GST_INPUT_SELECTOR_LOCK (object);
987 g_value_set_object (value, sel->active_sinkpad);
988 GST_INPUT_SELECTOR_UNLOCK (object);
990 case PROP_SYNC_STREAMS:
991 GST_INPUT_SELECTOR_LOCK (object);
992 g_value_set_boolean (value, sel->sync_streams);
993 GST_INPUT_SELECTOR_UNLOCK (object);
996 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1002 gst_input_selector_get_linked_pad (GstInputSelector * sel, GstPad * pad,
1005 GstPad *otherpad = NULL;
1007 GST_INPUT_SELECTOR_LOCK (sel);
1008 if (pad == sel->srcpad)
1009 otherpad = sel->active_sinkpad;
1010 else if (pad == sel->active_sinkpad || !strict)
1011 otherpad = sel->srcpad;
1013 gst_object_ref (otherpad);
1014 GST_INPUT_SELECTOR_UNLOCK (sel);
1020 gst_input_selector_event (GstPad * pad, GstObject * parent, GstEvent * event)
1022 GstInputSelector *sel;
1023 gboolean result = FALSE;
1025 gboolean done = FALSE;
1026 GValue item = { 0, };
1028 GList *pushed_pads = NULL;
1030 sel = GST_INPUT_SELECTOR (parent);
1031 /* Send upstream events to all sinkpads */
1032 iter = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (sel));
1034 /* This is now essentially a copy of gst_pad_event_default_dispatch
1035 * with a different iterator */
1037 switch (gst_iterator_next (iter, &item)) {
1038 case GST_ITERATOR_OK:
1039 eventpad = g_value_get_object (&item);
1041 /* if already pushed, skip */
1042 if (g_list_find (pushed_pads, eventpad)) {
1043 g_value_reset (&item);
1047 gst_event_ref (event);
1048 result |= gst_pad_push_event (eventpad, event);
1050 g_value_reset (&item);
1052 case GST_ITERATOR_RESYNC:
1053 /* We don't reset the result here because we don't push the event
1054 * again on pads that got the event already and because we need
1055 * to consider the result of the previous pushes */
1056 gst_iterator_resync (iter);
1058 case GST_ITERATOR_ERROR:
1059 GST_ERROR_OBJECT (pad, "Could not iterate over sinkpads");
1062 case GST_ITERATOR_DONE:
1067 g_value_unset (&item);
1068 gst_iterator_free (iter);
1070 g_list_free (pushed_pads);
1072 gst_event_unref (event);
1077 /* query on the srcpad. We override this function because by default it will
1078 * only forward the query to one random sinkpad */
1080 gst_input_selector_query (GstPad * pad, GstObject * parent, GstQuery * query)
1082 gboolean res = FALSE;
1083 GstInputSelector *sel;
1085 sel = GST_INPUT_SELECTOR (parent);
1087 switch (GST_QUERY_TYPE (query)) {
1088 case GST_QUERY_LATENCY:
1091 GstClockTime resmin, resmax;
1098 /* perform the query on all sinkpads and combine the results. We take the
1099 * max of min and the min of max for the result latency. */
1100 GST_INPUT_SELECTOR_LOCK (sel);
1101 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk;
1102 walk = g_list_next (walk)) {
1103 GstPad *sinkpad = GST_PAD_CAST (walk->data);
1105 if (gst_pad_peer_query (sinkpad, query)) {
1106 GstClockTime min, max;
1109 /* one query succeeded, we succeed too */
1112 gst_query_parse_latency (query, &live, &min, &max);
1114 GST_DEBUG_OBJECT (sinkpad,
1115 "peer latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1116 ", live %d", GST_TIME_ARGS (min), GST_TIME_ARGS (max), live);
1123 else if (max < resmax)
1125 if (reslive == FALSE)
1130 GST_INPUT_SELECTOR_UNLOCK (sel);
1132 gst_query_set_latency (query, reslive, resmin, resmax);
1134 GST_DEBUG_OBJECT (sel,
1135 "total latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1136 ", live %d", GST_TIME_ARGS (resmin), GST_TIME_ARGS (resmax),
1143 res = gst_pad_query_default (pad, parent, query);
1150 /* check if the pad is the active sinkpad */
1151 static inline gboolean
1152 gst_input_selector_is_active_sinkpad (GstInputSelector * sel, GstPad * pad)
1156 GST_INPUT_SELECTOR_LOCK (sel);
1157 res = (pad == sel->active_sinkpad);
1158 GST_INPUT_SELECTOR_UNLOCK (sel);
1163 /* Get or create the active sinkpad, must be called with SELECTOR_LOCK */
1165 gst_input_selector_activate_sinkpad (GstInputSelector * sel, GstPad * pad)
1167 GstPad *active_sinkpad;
1168 GstSelectorPad *selpad;
1170 selpad = GST_SELECTOR_PAD_CAST (pad);
1172 selpad->active = TRUE;
1173 active_sinkpad = sel->active_sinkpad;
1174 if (active_sinkpad == NULL) {
1175 /* first pad we get activity on becomes the activated pad by default */
1176 if (sel->active_sinkpad)
1177 gst_object_unref (sel->active_sinkpad);
1178 active_sinkpad = sel->active_sinkpad = gst_object_ref (pad);
1179 GST_DEBUG_OBJECT (sel, "Activating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1182 return active_sinkpad;
1186 gst_input_selector_request_new_pad (GstElement * element,
1187 GstPadTemplate * templ, const gchar * unused, const GstCaps * caps)
1189 GstInputSelector *sel;
1191 GstPad *sinkpad = NULL;
1193 g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL);
1195 sel = GST_INPUT_SELECTOR (element);
1197 GST_INPUT_SELECTOR_LOCK (sel);
1199 GST_LOG_OBJECT (sel, "Creating new pad %d", sel->padcount);
1200 name = g_strdup_printf ("sink_%u", sel->padcount++);
1201 sinkpad = g_object_new (GST_TYPE_SELECTOR_PAD,
1202 "name", name, "direction", templ->direction, "template", templ, NULL);
1207 gst_pad_set_event_function (sinkpad,
1208 GST_DEBUG_FUNCPTR (gst_selector_pad_event));
1209 gst_pad_set_query_function (sinkpad,
1210 GST_DEBUG_FUNCPTR (gst_selector_pad_query));
1211 gst_pad_set_chain_function (sinkpad,
1212 GST_DEBUG_FUNCPTR (gst_selector_pad_chain));
1213 gst_pad_set_iterate_internal_links_function (sinkpad,
1214 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
1216 GST_OBJECT_FLAG_SET (sinkpad, GST_PAD_FLAG_PROXY_CAPS);
1217 GST_OBJECT_FLAG_SET (sinkpad, GST_PAD_FLAG_PROXY_ALLOCATION);
1218 gst_pad_set_active (sinkpad, TRUE);
1219 gst_element_add_pad (GST_ELEMENT (sel), sinkpad);
1220 GST_INPUT_SELECTOR_UNLOCK (sel);
1226 gst_input_selector_release_pad (GstElement * element, GstPad * pad)
1228 GstInputSelector *sel;
1230 sel = GST_INPUT_SELECTOR (element);
1231 GST_LOG_OBJECT (sel, "Releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1233 GST_INPUT_SELECTOR_LOCK (sel);
1234 /* if the pad was the active pad, makes us select a new one */
1235 if (sel->active_sinkpad == pad) {
1236 GST_DEBUG_OBJECT (sel, "Deactivating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1237 gst_object_unref (sel->active_sinkpad);
1238 sel->active_sinkpad = NULL;
1242 gst_pad_set_active (pad, FALSE);
1243 gst_element_remove_pad (GST_ELEMENT (sel), pad);
1244 GST_INPUT_SELECTOR_UNLOCK (sel);
1248 gst_input_selector_reset (GstInputSelector * sel)
1252 GST_INPUT_SELECTOR_LOCK (sel);
1253 /* clear active pad */
1254 if (sel->active_sinkpad) {
1255 gst_object_unref (sel->active_sinkpad);
1256 sel->active_sinkpad = NULL;
1258 /* reset each of our sinkpads state */
1259 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
1260 GstSelectorPad *selpad = GST_SELECTOR_PAD_CAST (walk->data);
1262 gst_selector_pad_reset (selpad);
1265 gst_tag_list_free (selpad->tags);
1266 selpad->tags = NULL;
1269 GST_INPUT_SELECTOR_UNLOCK (sel);
1272 static GstStateChangeReturn
1273 gst_input_selector_change_state (GstElement * element,
1274 GstStateChange transition)
1276 GstInputSelector *self = GST_INPUT_SELECTOR (element);
1277 GstStateChangeReturn result;
1279 switch (transition) {
1280 case GST_STATE_CHANGE_READY_TO_PAUSED:
1281 GST_INPUT_SELECTOR_LOCK (self);
1282 self->blocked = FALSE;
1283 self->flushing = FALSE;
1284 GST_INPUT_SELECTOR_UNLOCK (self);
1286 case GST_STATE_CHANGE_PAUSED_TO_READY:
1287 /* first unlock before we call the parent state change function, which
1288 * tries to acquire the stream lock when going to ready. */
1289 GST_INPUT_SELECTOR_LOCK (self);
1290 self->blocked = FALSE;
1291 self->flushing = TRUE;
1292 GST_INPUT_SELECTOR_BROADCAST (self);
1293 GST_INPUT_SELECTOR_UNLOCK (self);
1299 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1301 switch (transition) {
1302 case GST_STATE_CHANGE_PAUSED_TO_READY:
1303 gst_input_selector_reset (self);
1313 gst_input_selector_block (GstInputSelector * self)
1316 GstSelectorPad *spad;
1318 GST_INPUT_SELECTOR_LOCK (self);
1321 GST_WARNING_OBJECT (self, "switch already blocked");
1323 self->blocked = TRUE;
1324 spad = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
1327 ret = gst_selector_pad_get_running_time (spad);
1329 GST_DEBUG_OBJECT (self, "no active pad while blocking");
1331 GST_INPUT_SELECTOR_UNLOCK (self);