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 GST_DEBUG_CATEGORY_STATIC (input_selector_debug);
63 #define GST_CAT_DEFAULT input_selector_debug
65 #if GLIB_CHECK_VERSION(2, 26, 0)
66 #define NOTIFY_MUTEX_LOCK()
67 #define NOTIFY_MUTEX_UNLOCK()
69 static GStaticRecMutex notify_mutex = G_STATIC_REC_MUTEX_INIT;
70 #define NOTIFY_MUTEX_LOCK() g_static_rec_mutex_lock (¬ify_mutex)
71 #define NOTIFY_MUTEX_UNLOCK() g_static_rec_mutex_unlock (¬ify_mutex)
74 #define GST_INPUT_SELECTOR_GET_LOCK(sel) (((GstInputSelector*)(sel))->lock)
75 #define GST_INPUT_SELECTOR_GET_COND(sel) (((GstInputSelector*)(sel))->cond)
76 #define GST_INPUT_SELECTOR_LOCK(sel) (g_mutex_lock (GST_INPUT_SELECTOR_GET_LOCK(sel)))
77 #define GST_INPUT_SELECTOR_UNLOCK(sel) (g_mutex_unlock (GST_INPUT_SELECTOR_GET_LOCK(sel)))
78 #define GST_INPUT_SELECTOR_WAIT(sel) (g_cond_wait (GST_INPUT_SELECTOR_GET_COND(sel), \
79 GST_INPUT_SELECTOR_GET_LOCK(sel)))
80 #define GST_INPUT_SELECTOR_BROADCAST(sel) (g_cond_broadcast (GST_INPUT_SELECTOR_GET_COND(sel)))
82 static GstStaticPadTemplate gst_input_selector_sink_factory =
83 GST_STATIC_PAD_TEMPLATE ("sink%d",
88 static GstStaticPadTemplate gst_input_selector_src_factory =
89 GST_STATIC_PAD_TEMPLATE ("src",
101 #define DEFAULT_PAD_ALWAYS_OK TRUE
106 PROP_PAD_RUNNING_TIME,
119 static guint gst_input_selector_signals[LAST_SIGNAL] = { 0 };
121 static inline gboolean gst_input_selector_is_active_sinkpad (GstInputSelector *
123 static GstPad *gst_input_selector_activate_sinkpad (GstInputSelector * sel,
125 static GstPad *gst_input_selector_get_linked_pad (GstInputSelector * sel,
126 GstPad * pad, gboolean strict);
128 #define GST_TYPE_SELECTOR_PAD \
129 (gst_selector_pad_get_type())
130 #define GST_SELECTOR_PAD(obj) \
131 (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_SELECTOR_PAD, GstSelectorPad))
132 #define GST_SELECTOR_PAD_CLASS(klass) \
133 (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_SELECTOR_PAD, GstSelectorPadClass))
134 #define GST_IS_SELECTOR_PAD(obj) \
135 (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_SELECTOR_PAD))
136 #define GST_IS_SELECTOR_PAD_CLASS(klass) \
137 (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_SELECTOR_PAD))
138 #define GST_SELECTOR_PAD_CAST(obj) \
139 ((GstSelectorPad *)(obj))
141 typedef struct _GstSelectorPad GstSelectorPad;
142 typedef struct _GstSelectorPadClass GstSelectorPadClass;
144 struct _GstSelectorPad
148 gboolean active; /* when buffer have passed the pad */
149 gboolean pushed; /* when buffer was pushed downstream since activation */
150 gboolean eos; /* when EOS has been received */
151 gboolean eos_sent; /* when EOS was sent downstream */
152 gboolean discont; /* after switching we create a discont */
153 gboolean flushing; /* set after flush-start and before flush-stop */
155 GstSegment segment; /* the current segment on the pad */
156 GstTagList *tags; /* last tags received on the pad */
158 gboolean segment_pending;
161 struct _GstSelectorPadClass
166 GType gst_selector_pad_get_type (void);
167 static void gst_selector_pad_finalize (GObject * object);
168 static void gst_selector_pad_get_property (GObject * object,
169 guint prop_id, GValue * value, GParamSpec * pspec);
170 static void gst_selector_pad_set_property (GObject * object,
171 guint prop_id, const GValue * value, GParamSpec * pspec);
173 static gint64 gst_selector_pad_get_running_time (GstSelectorPad * pad);
174 static void gst_selector_pad_reset (GstSelectorPad * pad);
175 static gboolean gst_selector_pad_event (GstPad * pad, GstEvent * event);
176 static GstCaps *gst_selector_pad_getcaps (GstPad * pad);
177 static gboolean gst_selector_pad_acceptcaps (GstPad * pad, GstCaps * caps);
178 static GstIterator *gst_selector_pad_iterate_linked_pads (GstPad * pad);
179 static GstFlowReturn gst_selector_pad_chain (GstPad * pad, GstBuffer * buf);
181 G_DEFINE_TYPE (GstSelectorPad, gst_selector_pad, GST_TYPE_PAD);
184 gst_selector_pad_class_init (GstSelectorPadClass * klass)
186 GObjectClass *gobject_class;
188 gobject_class = (GObjectClass *) klass;
190 gobject_class->finalize = gst_selector_pad_finalize;
192 gobject_class->get_property = gst_selector_pad_get_property;
193 gobject_class->set_property = gst_selector_pad_set_property;
195 g_object_class_install_property (gobject_class, PROP_PAD_RUNNING_TIME,
196 g_param_spec_int64 ("running-time", "Running time",
197 "Running time of stream on pad", 0, G_MAXINT64, 0,
198 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
199 g_object_class_install_property (gobject_class, PROP_PAD_TAGS,
200 g_param_spec_boxed ("tags", "Tags",
201 "The currently active tags on the pad", GST_TYPE_TAG_LIST,
202 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
203 g_object_class_install_property (gobject_class, PROP_PAD_ACTIVE,
204 g_param_spec_boolean ("active", "Active",
205 "If the pad is currently active", FALSE,
206 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
207 /* FIXME: better property name? */
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 | G_PARAM_STATIC_STRINGS));
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 (gst_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);
316 pad->eos_sent = FALSE;
317 pad->segment_pending = FALSE;
318 pad->discont = FALSE;
319 pad->flushing = FALSE;
320 gst_segment_init (&pad->segment, GST_FORMAT_UNDEFINED);
321 GST_OBJECT_UNLOCK (pad);
324 /* strictly get the linked pad from the sinkpad. If the pad is active we return
325 * the srcpad else we return NULL */
327 gst_selector_pad_iterate_linked_pads (GstPad * pad)
329 GstInputSelector *sel;
333 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
334 if (G_UNLIKELY (sel == NULL))
337 otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE);
338 it = gst_iterator_new_single (GST_TYPE_PAD, otherpad,
339 (GstCopyFunction) gst_object_ref, (GFreeFunc) gst_object_unref);
342 gst_object_unref (otherpad);
343 gst_object_unref (sel);
349 gst_selector_pad_event (GstPad * pad, GstEvent * event)
353 GstInputSelector *sel;
354 GstSelectorPad *selpad;
355 GstPad *prev_active_sinkpad;
356 GstPad *active_sinkpad;
358 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
359 if (G_UNLIKELY (sel == NULL)) {
360 gst_event_unref (event);
363 selpad = GST_SELECTOR_PAD_CAST (pad);
365 GST_INPUT_SELECTOR_LOCK (sel);
366 prev_active_sinkpad = sel->active_sinkpad;
367 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
369 /* only forward if we are dealing with the active sinkpad */
370 forward = (pad == active_sinkpad);
371 GST_INPUT_SELECTOR_UNLOCK (sel);
373 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) {
374 NOTIFY_MUTEX_LOCK ();
375 g_object_notify (G_OBJECT (sel), "active-pad");
376 NOTIFY_MUTEX_UNLOCK ();
379 switch (GST_EVENT_TYPE (event)) {
380 case GST_EVENT_FLUSH_START:
381 /* Unblock the pad if it's waiting */
382 GST_INPUT_SELECTOR_LOCK (sel);
383 selpad->flushing = TRUE;
384 GST_INPUT_SELECTOR_BROADCAST (sel);
385 GST_INPUT_SELECTOR_UNLOCK (sel);
387 case GST_EVENT_FLUSH_STOP:
388 GST_INPUT_SELECTOR_LOCK (sel);
389 gst_selector_pad_reset (selpad);
390 sel->pending_close = FALSE;
391 GST_INPUT_SELECTOR_UNLOCK (sel);
393 case GST_EVENT_NEWSEGMENT:
398 gint64 start, stop, time;
400 gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
401 &start, &stop, &time);
403 GST_DEBUG_OBJECT (pad,
404 "configured NEWSEGMENT update %d, rate %lf, applied rate %lf, "
406 "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
407 G_GINT64_FORMAT, update, rate, arate, format, start, stop, time);
409 GST_INPUT_SELECTOR_LOCK (sel);
410 GST_OBJECT_LOCK (selpad);
411 gst_segment_set_newsegment_full (&selpad->segment, update,
412 rate, arate, format, start, stop, time);
413 GST_OBJECT_UNLOCK (selpad);
415 /* If we aren't forwarding the event because the pad is not the
416 * active_sinkpad, then set the flag on the pad
417 * that says a segment needs sending if/when that pad is activated.
418 * For all other cases, we send the event immediately, which makes
419 * sparse streams and other segment updates work correctly downstream.
422 selpad->segment_pending = TRUE;
424 GST_INPUT_SELECTOR_UNLOCK (sel);
429 GstTagList *tags, *oldtags, *newtags;
431 gst_event_parse_tag (event, &tags);
433 GST_OBJECT_LOCK (selpad);
434 oldtags = selpad->tags;
436 newtags = gst_tag_list_merge (oldtags, tags, GST_TAG_MERGE_REPLACE);
437 selpad->tags = newtags;
439 gst_tag_list_free (oldtags);
440 GST_DEBUG_OBJECT (pad, "received tags %" GST_PTR_FORMAT, newtags);
441 GST_OBJECT_UNLOCK (selpad);
443 g_object_notify (G_OBJECT (selpad), "tags");
450 selpad->eos_sent = TRUE;
454 /* If the active sinkpad is in EOS state but EOS
455 * was not sent downstream this means that the pad
456 * got EOS before it was set as active pad and that
457 * the previously active pad got EOS after it was
460 GST_INPUT_SELECTOR_LOCK (sel);
461 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
462 tmp = GST_SELECTOR_PAD (active_sinkpad);
463 forward = (tmp->eos && !tmp->eos_sent);
464 tmp->eos_sent = TRUE;
465 GST_INPUT_SELECTOR_UNLOCK (sel);
467 GST_DEBUG_OBJECT (pad, "received EOS");
473 GST_DEBUG_OBJECT (pad, "forwarding event");
474 res = gst_pad_push_event (sel->srcpad, event);
476 gst_event_unref (event);
478 gst_object_unref (sel);
484 gst_selector_pad_getcaps (GstPad * pad)
486 GstInputSelector *sel;
489 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
490 if (G_UNLIKELY (sel == NULL))
491 return gst_caps_new_any ();
493 GST_DEBUG_OBJECT (sel, "Getting caps of srcpad peer");
494 caps = gst_pad_peer_get_caps_reffed (sel->srcpad);
496 caps = gst_caps_new_any ();
498 gst_object_unref (sel);
504 gst_selector_pad_acceptcaps (GstPad * pad, GstCaps * caps)
506 GstInputSelector *sel;
509 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
510 if (G_UNLIKELY (sel == NULL))
513 GST_DEBUG_OBJECT (sel, "Checking acceptcaps of srcpad peer");
514 res = gst_pad_peer_accept_caps (sel->srcpad, caps);
515 gst_object_unref (sel);
520 /* must be called with the SELECTOR_LOCK, will block while the pad is blocked
521 * or return TRUE when flushing */
523 gst_input_selector_wait (GstInputSelector * self, GstSelectorPad * pad)
525 while (self->blocked && !self->flushing && !pad->flushing) {
526 /* we can be unlocked here when we are shutting down (flushing) or when we
528 GST_INPUT_SELECTOR_WAIT (self);
530 return self->flushing;
534 gst_selector_pad_chain (GstPad * pad, GstBuffer * buf)
536 GstInputSelector *sel;
538 GstPad *active_sinkpad;
539 GstPad *prev_active_sinkpad;
540 GstSelectorPad *selpad;
541 GstClockTime start_time;
543 GstEvent *close_event = NULL, *start_event = NULL;
545 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
546 selpad = GST_SELECTOR_PAD_CAST (pad);
547 seg = &selpad->segment;
549 GST_INPUT_SELECTOR_LOCK (sel);
550 /* wait or check for flushing */
551 if (gst_input_selector_wait (sel, selpad))
554 GST_LOG_OBJECT (pad, "getting active pad");
556 prev_active_sinkpad = sel->active_sinkpad;
557 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
559 /* update the segment on the srcpad */
560 start_time = GST_BUFFER_TIMESTAMP (buf);
561 if (GST_CLOCK_TIME_IS_VALID (start_time)) {
562 GST_LOG_OBJECT (pad, "received start time %" GST_TIME_FORMAT,
563 GST_TIME_ARGS (start_time));
564 if (GST_BUFFER_DURATION_IS_VALID (buf))
565 GST_LOG_OBJECT (pad, "received end time %" GST_TIME_FORMAT,
566 GST_TIME_ARGS (start_time + GST_BUFFER_DURATION (buf)));
568 GST_OBJECT_LOCK (pad);
569 gst_segment_set_last_stop (seg, seg->format, start_time);
570 GST_OBJECT_UNLOCK (pad);
573 /* Ignore buffers from pads except the selected one */
574 if (pad != active_sinkpad)
577 if (G_UNLIKELY (sel->pending_close)) {
578 GstSegment *cseg = &sel->segment;
580 GST_DEBUG_OBJECT (sel,
581 "pushing close NEWSEGMENT update %d, rate %lf, applied rate %lf, "
583 "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
584 G_GINT64_FORMAT, TRUE, cseg->rate, cseg->applied_rate, cseg->format,
585 cseg->start, cseg->stop, cseg->time);
587 /* create update segment */
588 close_event = gst_event_new_new_segment_full (TRUE, cseg->rate,
589 cseg->applied_rate, cseg->format, cseg->start, cseg->stop, cseg->time);
591 sel->pending_close = FALSE;
593 /* if we have a pending segment, push it out now */
594 if (G_UNLIKELY (selpad->segment_pending)) {
595 GST_DEBUG_OBJECT (pad,
596 "pushing pending NEWSEGMENT update %d, rate %lf, applied rate %lf, "
598 "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
599 G_GINT64_FORMAT, FALSE, seg->rate, seg->applied_rate, seg->format,
600 seg->start, seg->stop, seg->time);
602 start_event = gst_event_new_new_segment_full (FALSE, seg->rate,
603 seg->applied_rate, seg->format, seg->start, seg->stop, seg->time);
605 selpad->segment_pending = FALSE;
607 GST_INPUT_SELECTOR_UNLOCK (sel);
609 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) {
610 NOTIFY_MUTEX_LOCK ();
611 g_object_notify (G_OBJECT (sel), "active-pad");
612 NOTIFY_MUTEX_UNLOCK ();
616 gst_pad_push_event (sel->srcpad, close_event);
619 gst_pad_push_event (sel->srcpad, start_event);
621 if (selpad->discont) {
622 buf = gst_buffer_make_writable (buf);
624 GST_DEBUG_OBJECT (pad, "Marking discont buffer %p", buf);
625 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
626 selpad->discont = FALSE;
630 GST_LOG_OBJECT (pad, "Forwarding buffer %p", buf);
633 if ((caps = GST_BUFFER_CAPS (buf))) {
634 if (GST_PAD_CAPS (sel->srcpad) != caps)
635 gst_pad_set_caps (sel->srcpad, caps);
639 res = gst_pad_push (sel->srcpad, buf);
640 selpad->pushed = TRUE;
643 gst_object_unref (sel);
646 /* dropped buffers */
649 gboolean active_pad_pushed = GST_SELECTOR_PAD_CAST (active_sinkpad)->pushed;
651 GST_DEBUG_OBJECT (pad, "Pad not active, discard buffer %p", buf);
652 /* when we drop a buffer, we're creating a discont on this pad */
653 selpad->discont = TRUE;
654 GST_INPUT_SELECTOR_UNLOCK (sel);
655 gst_buffer_unref (buf);
657 /* figure out what to return upstream */
658 GST_OBJECT_LOCK (selpad);
659 if (selpad->always_ok || !active_pad_pushed)
662 res = GST_FLOW_NOT_LINKED;
663 GST_OBJECT_UNLOCK (selpad);
669 GST_DEBUG_OBJECT (pad, "We are flushing, discard buffer %p", buf);
670 GST_INPUT_SELECTOR_UNLOCK (sel);
671 gst_buffer_unref (buf);
672 res = GST_FLOW_WRONG_STATE;
677 static void gst_input_selector_dispose (GObject * object);
679 static void gst_input_selector_set_property (GObject * object,
680 guint prop_id, const GValue * value, GParamSpec * pspec);
681 static void gst_input_selector_get_property (GObject * object,
682 guint prop_id, GValue * value, GParamSpec * pspec);
684 static GstPad *gst_input_selector_request_new_pad (GstElement * element,
685 GstPadTemplate * templ, const gchar * unused);
686 static void gst_input_selector_release_pad (GstElement * element, GstPad * pad);
688 static GstStateChangeReturn gst_input_selector_change_state (GstElement *
689 element, GstStateChange transition);
691 static GstCaps *gst_input_selector_getcaps (GstPad * pad);
692 static gboolean gst_input_selector_event (GstPad * pad, GstEvent * event);
693 static gboolean gst_input_selector_query (GstPad * pad, GstQuery * query);
694 static gint64 gst_input_selector_block (GstInputSelector * self);
695 static void gst_input_selector_switch (GstInputSelector * self,
696 GstPad * pad, gint64 stop_time, gint64 start_time);
698 /* FIXME: create these marshallers using glib-genmarshal */
699 #define g_marshal_value_peek_object(v) (v)->data[0].v_pointer
700 #define g_marshal_value_peek_int64(v) (v)->data[0].v_int64
703 gst_input_selector_marshal_INT64__VOID (GClosure * closure,
704 GValue * return_value G_GNUC_UNUSED,
705 guint n_param_values,
706 const GValue * param_values,
707 gpointer invocation_hint G_GNUC_UNUSED, gpointer marshal_data)
709 typedef gint64 (*GMarshalFunc_INT64__VOID) (gpointer data1, gpointer data2);
710 register GMarshalFunc_INT64__VOID callback;
711 register GCClosure *cc = (GCClosure *) closure;
712 register gpointer data1, data2;
715 g_return_if_fail (return_value != NULL);
716 g_return_if_fail (n_param_values == 1);
718 if (G_CCLOSURE_SWAP_DATA (closure)) {
719 data1 = closure->data;
720 data2 = g_value_peek_pointer (param_values + 0);
722 data1 = g_value_peek_pointer (param_values + 0);
723 data2 = closure->data;
726 (GMarshalFunc_INT64__VOID) (marshal_data ? marshal_data : cc->callback);
728 v_return = callback (data1, data2);
730 g_value_set_int64 (return_value, v_return);
734 gst_input_selector_marshal_VOID__OBJECT_INT64_INT64 (GClosure * closure,
735 GValue * return_value G_GNUC_UNUSED,
736 guint n_param_values,
737 const GValue * param_values,
738 gpointer invocation_hint G_GNUC_UNUSED, gpointer marshal_data)
740 typedef void (*GMarshalFunc_VOID__OBJECT_INT64_INT64) (gpointer data1,
741 gpointer arg_1, gint64 arg_2, gint64 arg_3, gpointer data2);
742 register GMarshalFunc_VOID__OBJECT_INT64_INT64 callback;
743 register GCClosure *cc = (GCClosure *) closure;
744 register gpointer data1, data2;
746 g_return_if_fail (n_param_values == 4);
748 if (G_CCLOSURE_SWAP_DATA (closure)) {
749 data1 = closure->data;
750 data2 = g_value_peek_pointer (param_values + 0);
752 data1 = g_value_peek_pointer (param_values + 0);
753 data2 = closure->data;
756 (GMarshalFunc_VOID__OBJECT_INT64_INT64) (marshal_data ? marshal_data :
760 g_marshal_value_peek_object (param_values + 1),
761 g_marshal_value_peek_int64 (param_values + 2),
762 g_marshal_value_peek_int64 (param_values + 3), data2);
766 GST_DEBUG_CATEGORY_INIT (input_selector_debug, \
767 "input-selector", 0, "An input stream selector element");
768 #define gst_input_selector_parent_class parent_class
769 G_DEFINE_TYPE_WITH_CODE (GstInputSelector, gst_input_selector, GST_TYPE_ELEMENT,
773 gst_input_selector_class_init (GstInputSelectorClass * klass)
775 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
776 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
778 gobject_class->dispose = gst_input_selector_dispose;
780 gobject_class->set_property = gst_input_selector_set_property;
781 gobject_class->get_property = gst_input_selector_get_property;
783 g_object_class_install_property (gobject_class, PROP_N_PADS,
784 g_param_spec_uint ("n-pads", "Number of Pads",
785 "The number of sink pads", 0, G_MAXUINT, 0,
786 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
788 g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD,
789 g_param_spec_object ("active-pad", "Active pad",
790 "The currently active sink pad", GST_TYPE_PAD,
791 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
794 * GstInputSelector::block:
795 * @inputselector: the #GstInputSelector
797 * Block all sink pads in preparation for a switch. Returns the stop time of
798 * the current switch segment, as a running time, or 0 if there is no current
799 * active pad or the current active pad never received data.
801 gst_input_selector_signals[SIGNAL_BLOCK] =
802 g_signal_new ("block", G_TYPE_FROM_CLASS (klass),
803 G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
804 G_STRUCT_OFFSET (GstInputSelectorClass, block), NULL, NULL,
805 gst_input_selector_marshal_INT64__VOID, G_TYPE_INT64, 0);
807 * GstInputSelector::switch:
808 * @inputselector: the #GstInputSelector
809 * @pad: the pad to switch to
810 * @stop_time: running time at which to close the previous segment, or -1
811 * to use the running time of the previously active sink pad
812 * @start_time: running time at which to start the new segment, or -1 to
813 * use the running time of the newly active sink pad
815 * Switch to a new feed. The segment opened by the previously active pad, if
816 * any, will be closed, and a new segment opened before data flows again.
818 * This signal must be emitted when the element has been blocked via the <link
819 * linkend="GstInputSelector-block">block</link> signal.
821 * If you have a stream with only one switch element, such as an audio-only
822 * stream, a stream switch should be performed by first emitting the block
823 * signal, and then emitting the switch signal with -1 for the stop and start
826 * The intention of the @stop_time and @start_time arguments is to allow
827 * multiple switch elements to switch and maintain stream synchronization.
828 * When switching a stream with multiple feeds, you will need as many switch
829 * elements as you have feeds. For example, a feed with audio and video will
830 * have one switch element between the audio feeds and one for video.
832 * A switch over multiple switch elements should be performed as follows:
833 * First, emit the <link linkend="GstInputSelector-block">block</link>
834 * signal, collecting the returned values. The maximum running time returned
835 * by block should then be used as the time at which to close the previous
838 * Then, query the running times of the new audio and video pads that you will
839 * switch to. Naturally, these pads are on separate switch elements. Take the
840 * minimum running time for those streams and use it for the time at which to
841 * open the new segment.
843 * If @pad is the same as the current active pad, the element will cancel any
844 * previous block without adjusting segments.
847 * the signal changed from accepting the pad name to the pad object.
852 gst_input_selector_signals[SIGNAL_SWITCH] =
853 g_signal_new ("switch", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
854 G_STRUCT_OFFSET (GstInputSelectorClass, switch_),
855 NULL, NULL, gst_input_selector_marshal_VOID__OBJECT_INT64_INT64,
856 G_TYPE_NONE, 3, GST_TYPE_PAD, G_TYPE_INT64, G_TYPE_INT64);
858 gst_element_class_set_details_simple (gstelement_class, "Input selector",
859 "Generic", "N-to-1 input stream selector",
860 "Julien Moutte <julien@moutte.net>, "
861 "Jan Schmidt <thaytan@mad.scientist.com>, "
862 "Wim Taymans <wim.taymans@gmail.com>");
863 gst_element_class_add_pad_template (gstelement_class,
864 gst_static_pad_template_get (&gst_input_selector_sink_factory));
865 gst_element_class_add_pad_template (gstelement_class,
866 gst_static_pad_template_get (&gst_input_selector_src_factory));
868 gstelement_class->request_new_pad = gst_input_selector_request_new_pad;
869 gstelement_class->release_pad = gst_input_selector_release_pad;
870 gstelement_class->change_state = gst_input_selector_change_state;
872 klass->block = GST_DEBUG_FUNCPTR (gst_input_selector_block);
873 /* note the underscore because switch is a keyword otherwise */
874 klass->switch_ = GST_DEBUG_FUNCPTR (gst_input_selector_switch);
878 gst_input_selector_init (GstInputSelector * sel)
880 sel->srcpad = gst_pad_new ("src", GST_PAD_SRC);
881 gst_pad_set_iterate_internal_links_function (sel->srcpad,
882 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
883 gst_pad_set_getcaps_function (sel->srcpad,
884 GST_DEBUG_FUNCPTR (gst_input_selector_getcaps));
885 gst_pad_set_query_function (sel->srcpad,
886 GST_DEBUG_FUNCPTR (gst_input_selector_query));
887 gst_pad_set_event_function (sel->srcpad,
888 GST_DEBUG_FUNCPTR (gst_input_selector_event));
889 gst_element_add_pad (GST_ELEMENT (sel), sel->srcpad);
890 /* sinkpad management */
891 sel->active_sinkpad = NULL;
893 gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED);
895 sel->lock = g_mutex_new ();
896 sel->cond = g_cond_new ();
897 sel->blocked = FALSE;
901 gst_input_selector_dispose (GObject * object)
903 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
905 if (sel->active_sinkpad) {
906 gst_object_unref (sel->active_sinkpad);
907 sel->active_sinkpad = NULL;
910 g_mutex_free (sel->lock);
914 g_cond_free (sel->cond);
918 G_OBJECT_CLASS (parent_class)->dispose (object);
921 /* Solve the following equation for B.timestamp, and set that as the segment
923 * B.running_time = (B.timestamp - NS.start) / NS.abs_rate + NS.accum
926 gst_segment_get_timestamp (GstSegment * segment, gint64 running_time)
928 if (running_time <= segment->accum)
929 return segment->start;
931 return (running_time - segment->accum) * segment->abs_rate + segment->start;
935 gst_segment_set_stop (GstSegment * segment, gint64 running_time)
937 segment->stop = gst_segment_get_timestamp (segment, running_time);
938 segment->last_stop = -1;
942 gst_segment_set_start (GstSegment * segment, gint64 running_time)
944 gint64 new_start, duration;
946 new_start = gst_segment_get_timestamp (segment, running_time);
948 /* this is the duration we skipped */
949 duration = new_start - segment->start;
950 /* add the duration to the accumulated segment time */
951 segment->accum += duration;
952 /* move position in the segment */
953 segment->time += duration;
954 segment->start += duration;
957 /* this function must be called with the SELECTOR_LOCK. It returns TRUE when the
958 * active pad changed. */
960 gst_input_selector_set_active_pad (GstInputSelector * self,
961 GstPad * pad, gint64 stop_time, gint64 start_time)
963 GstSelectorPad *old, *new;
964 GstPad **active_pad_p;
966 if (pad == self->active_sinkpad)
969 old = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
970 new = GST_SELECTOR_PAD_CAST (pad);
972 GST_DEBUG_OBJECT (self, "setting active pad to %s:%s",
973 GST_DEBUG_PAD_NAME (new));
975 if (!GST_CLOCK_TIME_IS_VALID (stop_time) && old) {
976 /* no stop time given, get the latest running_time on the active pad to
977 * close and open the new segment */
978 stop_time = start_time = gst_selector_pad_get_running_time (old);
979 GST_DEBUG_OBJECT (self, "using start/stop of %" GST_TIME_FORMAT,
980 GST_TIME_ARGS (start_time));
983 if (old && old->active && !self->pending_close && stop_time >= 0) {
984 /* schedule a last_stop update if one isn't already scheduled, and a
985 segment has been pushed before. */
986 memcpy (&self->segment, &old->segment, sizeof (self->segment));
988 GST_DEBUG_OBJECT (self, "setting stop_time to %" GST_TIME_FORMAT,
989 GST_TIME_ARGS (stop_time));
990 gst_segment_set_stop (&self->segment, stop_time);
991 self->pending_close = TRUE;
996 if (new && new->active && start_time >= 0) {
997 GST_DEBUG_OBJECT (self, "setting start_time to %" GST_TIME_FORMAT,
998 GST_TIME_ARGS (start_time));
999 /* schedule a new segment push */
1000 gst_segment_set_start (&new->segment, start_time);
1001 new->segment_pending = TRUE;
1004 new->pushed = FALSE;
1006 active_pad_p = &self->active_sinkpad;
1007 gst_object_replace ((GstObject **) active_pad_p, GST_OBJECT_CAST (pad));
1008 GST_DEBUG_OBJECT (self, "New active pad is %" GST_PTR_FORMAT,
1009 self->active_sinkpad);
1015 gst_input_selector_set_property (GObject * object, guint prop_id,
1016 const GValue * value, GParamSpec * pspec)
1018 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
1021 case PROP_ACTIVE_PAD:
1025 pad = g_value_get_object (value);
1027 GST_INPUT_SELECTOR_LOCK (sel);
1028 gst_input_selector_set_active_pad (sel, pad,
1029 GST_CLOCK_TIME_NONE, GST_CLOCK_TIME_NONE);
1030 GST_INPUT_SELECTOR_UNLOCK (sel);
1034 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1040 gst_input_selector_get_property (GObject * object, guint prop_id,
1041 GValue * value, GParamSpec * pspec)
1043 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
1047 GST_INPUT_SELECTOR_LOCK (object);
1048 g_value_set_uint (value, sel->n_pads);
1049 GST_INPUT_SELECTOR_UNLOCK (object);
1051 case PROP_ACTIVE_PAD:
1052 GST_INPUT_SELECTOR_LOCK (object);
1053 g_value_set_object (value, sel->active_sinkpad);
1054 GST_INPUT_SELECTOR_UNLOCK (object);
1057 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1063 gst_input_selector_get_linked_pad (GstInputSelector * sel, GstPad * pad,
1066 GstPad *otherpad = NULL;
1068 GST_INPUT_SELECTOR_LOCK (sel);
1069 if (pad == sel->srcpad)
1070 otherpad = sel->active_sinkpad;
1071 else if (pad == sel->active_sinkpad || !strict)
1072 otherpad = sel->srcpad;
1074 gst_object_ref (otherpad);
1075 GST_INPUT_SELECTOR_UNLOCK (sel);
1081 gst_input_selector_event (GstPad * pad, GstEvent * event)
1083 GstInputSelector *sel;
1084 gboolean res = FALSE;
1087 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
1088 if (G_UNLIKELY (sel == NULL)) {
1089 gst_event_unref (event);
1093 otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE);
1095 res = gst_pad_push_event (otherpad, event);
1097 gst_object_unref (otherpad);
1099 gst_event_unref (event);
1101 gst_object_unref (sel);
1105 /* query on the srcpad. We override this function because by default it will
1106 * only forward the query to one random sinkpad */
1108 gst_input_selector_query (GstPad * pad, GstQuery * query)
1110 gboolean res = TRUE;
1111 GstInputSelector *sel;
1114 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
1115 if (G_UNLIKELY (sel == NULL))
1118 otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE);
1120 switch (GST_QUERY_TYPE (query)) {
1121 case GST_QUERY_LATENCY:
1124 GstClockTime resmin, resmax;
1131 /* assume FALSE, we become TRUE if one query succeeds */
1134 /* perform the query on all sinkpads and combine the results. We take the
1135 * max of min and the min of max for the result latency. */
1136 GST_INPUT_SELECTOR_LOCK (sel);
1137 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk;
1138 walk = g_list_next (walk)) {
1139 GstPad *sinkpad = GST_PAD_CAST (walk->data);
1141 if (gst_pad_peer_query (sinkpad, query)) {
1142 GstClockTime min, max;
1145 /* one query succeeded, we succeed too */
1148 gst_query_parse_latency (query, &live, &min, &max);
1150 GST_DEBUG_OBJECT (sinkpad,
1151 "peer latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1152 ", live %d", GST_TIME_ARGS (min), GST_TIME_ARGS (max), live);
1159 else if (max < resmax)
1161 if (reslive == FALSE)
1166 GST_INPUT_SELECTOR_UNLOCK (sel);
1168 gst_query_set_latency (query, reslive, resmin, resmax);
1170 GST_DEBUG_OBJECT (sel,
1171 "total latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1172 ", live %d", GST_TIME_ARGS (resmin), GST_TIME_ARGS (resmax),
1180 res = gst_pad_peer_query (otherpad, query);
1184 gst_object_unref (otherpad);
1185 gst_object_unref (sel);
1191 gst_input_selector_getcaps (GstPad * pad)
1194 GstInputSelector *sel;
1197 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
1198 if (G_UNLIKELY (sel == NULL))
1199 return gst_caps_new_any ();
1201 otherpad = gst_input_selector_get_linked_pad (sel, pad, FALSE);
1204 GST_DEBUG_OBJECT (pad, "Pad not linked, returning ANY");
1205 caps = gst_caps_new_any ();
1207 GST_DEBUG_OBJECT (pad, "Pad is linked (to %s:%s), returning peer caps",
1208 GST_DEBUG_PAD_NAME (otherpad));
1209 /* if the peer has caps, use those. If the pad is not linked, this function
1210 * returns NULL and we return ANY */
1211 if (!(caps = gst_pad_peer_get_caps_reffed (otherpad)))
1212 caps = gst_caps_new_any ();
1213 gst_object_unref (otherpad);
1216 gst_object_unref (sel);
1220 /* check if the pad is the active sinkpad */
1221 static inline gboolean
1222 gst_input_selector_is_active_sinkpad (GstInputSelector * sel, GstPad * pad)
1226 GST_INPUT_SELECTOR_LOCK (sel);
1227 res = (pad == sel->active_sinkpad);
1228 GST_INPUT_SELECTOR_UNLOCK (sel);
1233 /* Get or create the active sinkpad, must be called with SELECTOR_LOCK */
1235 gst_input_selector_activate_sinkpad (GstInputSelector * sel, GstPad * pad)
1237 GstPad *active_sinkpad;
1238 GstSelectorPad *selpad;
1240 selpad = GST_SELECTOR_PAD_CAST (pad);
1242 selpad->active = TRUE;
1243 active_sinkpad = sel->active_sinkpad;
1244 if (active_sinkpad == NULL) {
1245 /* first pad we get activity on becomes the activated pad by default */
1246 if (sel->active_sinkpad)
1247 gst_object_unref (sel->active_sinkpad);
1248 active_sinkpad = sel->active_sinkpad = gst_object_ref (pad);
1249 GST_DEBUG_OBJECT (sel, "Activating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1252 return active_sinkpad;
1256 gst_input_selector_request_new_pad (GstElement * element,
1257 GstPadTemplate * templ, const gchar * unused)
1259 GstInputSelector *sel;
1261 GstPad *sinkpad = NULL;
1263 g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL);
1265 sel = GST_INPUT_SELECTOR (element);
1267 GST_INPUT_SELECTOR_LOCK (sel);
1269 GST_LOG_OBJECT (sel, "Creating new pad %d", sel->padcount);
1270 name = g_strdup_printf ("sink%d", sel->padcount++);
1271 sinkpad = g_object_new (GST_TYPE_SELECTOR_PAD,
1272 "name", name, "direction", templ->direction, "template", templ, NULL);
1277 gst_pad_set_event_function (sinkpad,
1278 GST_DEBUG_FUNCPTR (gst_selector_pad_event));
1279 gst_pad_set_getcaps_function (sinkpad,
1280 GST_DEBUG_FUNCPTR (gst_selector_pad_getcaps));
1281 gst_pad_set_acceptcaps_function (sinkpad,
1282 GST_DEBUG_FUNCPTR (gst_selector_pad_acceptcaps));
1283 gst_pad_set_chain_function (sinkpad,
1284 GST_DEBUG_FUNCPTR (gst_selector_pad_chain));
1285 gst_pad_set_iterate_internal_links_function (sinkpad,
1286 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
1288 gst_pad_set_active (sinkpad, TRUE);
1289 gst_element_add_pad (GST_ELEMENT (sel), sinkpad);
1290 GST_INPUT_SELECTOR_UNLOCK (sel);
1296 gst_input_selector_release_pad (GstElement * element, GstPad * pad)
1298 GstInputSelector *sel;
1300 sel = GST_INPUT_SELECTOR (element);
1301 GST_LOG_OBJECT (sel, "Releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1303 GST_INPUT_SELECTOR_LOCK (sel);
1304 /* if the pad was the active pad, makes us select a new one */
1305 if (sel->active_sinkpad == pad) {
1306 GST_DEBUG_OBJECT (sel, "Deactivating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1307 gst_object_unref (sel->active_sinkpad);
1308 sel->active_sinkpad = NULL;
1312 gst_pad_set_active (pad, FALSE);
1313 gst_element_remove_pad (GST_ELEMENT (sel), pad);
1314 GST_INPUT_SELECTOR_UNLOCK (sel);
1318 gst_input_selector_reset (GstInputSelector * sel)
1322 GST_INPUT_SELECTOR_LOCK (sel);
1323 /* clear active pad */
1324 if (sel->active_sinkpad) {
1325 gst_object_unref (sel->active_sinkpad);
1326 sel->active_sinkpad = NULL;
1329 gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED);
1330 sel->pending_close = FALSE;
1331 /* reset each of our sinkpads state */
1332 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
1333 GstSelectorPad *selpad = GST_SELECTOR_PAD_CAST (walk->data);
1335 gst_selector_pad_reset (selpad);
1338 gst_tag_list_free (selpad->tags);
1339 selpad->tags = NULL;
1342 GST_INPUT_SELECTOR_UNLOCK (sel);
1345 static GstStateChangeReturn
1346 gst_input_selector_change_state (GstElement * element,
1347 GstStateChange transition)
1349 GstInputSelector *self = GST_INPUT_SELECTOR (element);
1350 GstStateChangeReturn result;
1352 switch (transition) {
1353 case GST_STATE_CHANGE_READY_TO_PAUSED:
1354 GST_INPUT_SELECTOR_LOCK (self);
1355 self->blocked = FALSE;
1356 self->flushing = FALSE;
1357 GST_INPUT_SELECTOR_UNLOCK (self);
1359 case GST_STATE_CHANGE_PAUSED_TO_READY:
1360 /* first unlock before we call the parent state change function, which
1361 * tries to acquire the stream lock when going to ready. */
1362 GST_INPUT_SELECTOR_LOCK (self);
1363 self->blocked = FALSE;
1364 self->flushing = TRUE;
1365 GST_INPUT_SELECTOR_BROADCAST (self);
1366 GST_INPUT_SELECTOR_UNLOCK (self);
1372 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1374 switch (transition) {
1375 case GST_STATE_CHANGE_PAUSED_TO_READY:
1376 gst_input_selector_reset (self);
1386 gst_input_selector_block (GstInputSelector * self)
1389 GstSelectorPad *spad;
1391 GST_INPUT_SELECTOR_LOCK (self);
1394 GST_WARNING_OBJECT (self, "switch already blocked");
1396 self->blocked = TRUE;
1397 spad = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
1400 ret = gst_selector_pad_get_running_time (spad);
1402 GST_DEBUG_OBJECT (self, "no active pad while blocking");
1404 GST_INPUT_SELECTOR_UNLOCK (self);
1409 /* stop_time and start_time are running times */
1411 gst_input_selector_switch (GstInputSelector * self, GstPad * pad,
1412 gint64 stop_time, gint64 start_time)
1416 g_return_if_fail (self->blocked == TRUE);
1418 GST_INPUT_SELECTOR_LOCK (self);
1420 gst_input_selector_set_active_pad (self, pad, stop_time, start_time);
1422 self->blocked = FALSE;
1423 GST_INPUT_SELECTOR_BROADCAST (self);
1424 GST_INPUT_SELECTOR_UNLOCK (self);
1427 NOTIFY_MUTEX_LOCK ();
1428 g_object_notify (G_OBJECT (self), "active-pad");
1429 NOTIFY_MUTEX_UNLOCK ();