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, GstCaps * filter);
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 position = pad->segment.position;
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;
334 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
335 if (G_UNLIKELY (sel == NULL))
338 otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE);
339 g_value_init (&val, GST_TYPE_PAD);
340 g_value_set_object (&val, otherpad);
341 it = gst_iterator_new_single (GST_TYPE_PAD, &val);
342 g_value_unset (&val);
345 gst_object_unref (otherpad);
346 gst_object_unref (sel);
352 gst_selector_pad_event (GstPad * pad, GstEvent * event)
356 GstInputSelector *sel;
357 GstSelectorPad *selpad;
358 GstPad *prev_active_sinkpad;
359 GstPad *active_sinkpad;
361 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
362 if (G_UNLIKELY (sel == NULL)) {
363 gst_event_unref (event);
366 selpad = GST_SELECTOR_PAD_CAST (pad);
368 GST_INPUT_SELECTOR_LOCK (sel);
369 prev_active_sinkpad = sel->active_sinkpad;
370 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
372 /* only forward if we are dealing with the active sinkpad */
373 forward = (pad == active_sinkpad);
374 GST_INPUT_SELECTOR_UNLOCK (sel);
376 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) {
377 NOTIFY_MUTEX_LOCK ();
378 g_object_notify (G_OBJECT (sel), "active-pad");
379 NOTIFY_MUTEX_UNLOCK ();
382 switch (GST_EVENT_TYPE (event)) {
383 case GST_EVENT_FLUSH_START:
384 /* Unblock the pad if it's waiting */
385 GST_INPUT_SELECTOR_LOCK (sel);
386 selpad->flushing = TRUE;
387 GST_INPUT_SELECTOR_BROADCAST (sel);
388 GST_INPUT_SELECTOR_UNLOCK (sel);
390 case GST_EVENT_FLUSH_STOP:
391 GST_INPUT_SELECTOR_LOCK (sel);
392 gst_selector_pad_reset (selpad);
393 sel->pending_close = FALSE;
394 GST_INPUT_SELECTOR_UNLOCK (sel);
396 case GST_EVENT_SEGMENT:
398 GST_INPUT_SELECTOR_LOCK (sel);
399 GST_OBJECT_LOCK (selpad);
400 gst_event_parse_segment (event, &selpad->segment);
401 GST_DEBUG_OBJECT (pad, "configured SEGMENT %" GST_SEGMENT_FORMAT,
403 GST_OBJECT_UNLOCK (selpad);
405 /* If we aren't forwarding the event because the pad is not the
406 * active_sinkpad, then set the flag on the pad
407 * that says a segment needs sending if/when that pad is activated.
408 * For all other cases, we send the event immediately, which makes
409 * sparse streams and other segment updates work correctly downstream.
412 selpad->segment_pending = TRUE;
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);
468 gst_object_unref (sel);
474 gst_selector_pad_getcaps (GstPad * pad, GstCaps * filter)
476 GstInputSelector *sel;
479 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
480 if (G_UNLIKELY (sel == NULL))
481 return (filter ? gst_caps_ref (filter) : gst_caps_new_any ());
483 GST_DEBUG_OBJECT (sel, "Getting caps of srcpad peer");
484 caps = gst_pad_peer_get_caps (sel->srcpad, filter);
486 caps = (filter ? gst_caps_ref (filter) : gst_caps_new_any ());
488 gst_object_unref (sel);
494 gst_selector_pad_acceptcaps (GstPad * pad, GstCaps * caps)
496 GstInputSelector *sel;
499 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
500 if (G_UNLIKELY (sel == NULL))
503 GST_DEBUG_OBJECT (sel, "Checking acceptcaps of srcpad peer");
504 res = gst_pad_peer_accept_caps (sel->srcpad, caps);
505 gst_object_unref (sel);
510 /* must be called with the SELECTOR_LOCK, will block while the pad is blocked
511 * or return TRUE when flushing */
513 gst_input_selector_wait (GstInputSelector * self, GstSelectorPad * pad)
515 while (self->blocked && !self->flushing && !pad->flushing) {
516 /* we can be unlocked here when we are shutting down (flushing) or when we
518 GST_INPUT_SELECTOR_WAIT (self);
520 return self->flushing;
524 gst_selector_pad_chain (GstPad * pad, GstBuffer * buf)
526 GstInputSelector *sel;
528 GstPad *active_sinkpad;
529 GstPad *prev_active_sinkpad;
530 GstSelectorPad *selpad;
531 GstClockTime start_time;
533 GstEvent *start_event = NULL;
538 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
539 selpad = GST_SELECTOR_PAD_CAST (pad);
540 seg = &selpad->segment;
542 GST_INPUT_SELECTOR_LOCK (sel);
543 /* wait or check for flushing */
544 if (gst_input_selector_wait (sel, selpad))
547 GST_LOG_OBJECT (pad, "getting active pad");
549 prev_active_sinkpad = sel->active_sinkpad;
550 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
552 /* update the segment on the srcpad */
553 start_time = GST_BUFFER_TIMESTAMP (buf);
554 if (GST_CLOCK_TIME_IS_VALID (start_time)) {
555 GST_LOG_OBJECT (pad, "received start time %" GST_TIME_FORMAT,
556 GST_TIME_ARGS (start_time));
557 if (GST_BUFFER_DURATION_IS_VALID (buf))
558 GST_LOG_OBJECT (pad, "received end time %" GST_TIME_FORMAT,
559 GST_TIME_ARGS (start_time + GST_BUFFER_DURATION (buf)));
561 GST_OBJECT_LOCK (pad);
562 seg->position = start_time;
563 GST_OBJECT_UNLOCK (pad);
566 /* Ignore buffers from pads except the selected one */
567 if (pad != active_sinkpad)
570 /* if we have a pending segment, push it out now */
571 if (G_UNLIKELY (selpad->segment_pending)) {
572 GST_DEBUG_OBJECT (pad,
573 "pushing pending NEWSEGMENT update %d, rate %lf, applied rate %lf, "
575 "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
576 G_GINT64_FORMAT, FALSE, seg->rate, seg->applied_rate, seg->format,
577 seg->start, seg->stop, seg->time);
579 start_event = gst_event_new_segment (seg);
581 selpad->segment_pending = FALSE;
583 GST_INPUT_SELECTOR_UNLOCK (sel);
585 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) {
586 NOTIFY_MUTEX_LOCK ();
587 g_object_notify (G_OBJECT (sel), "active-pad");
588 NOTIFY_MUTEX_UNLOCK ();
592 gst_pad_push_event (sel->srcpad, start_event);
594 if (selpad->discont) {
595 buf = gst_buffer_make_writable (buf);
597 GST_DEBUG_OBJECT (pad, "Marking discont buffer %p", buf);
598 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
599 selpad->discont = FALSE;
603 GST_LOG_OBJECT (pad, "Forwarding buffer %p", buf);
606 if ((caps = GST_BUFFER_CAPS (buf))) {
607 if (GST_PAD_CAPS (sel->srcpad) != caps)
608 gst_pad_set_caps (sel->srcpad, caps);
612 res = gst_pad_push (sel->srcpad, buf);
613 selpad->pushed = TRUE;
616 gst_object_unref (sel);
619 /* dropped buffers */
622 gboolean active_pad_pushed = GST_SELECTOR_PAD_CAST (active_sinkpad)->pushed;
624 GST_DEBUG_OBJECT (pad, "Pad not active, discard buffer %p", buf);
625 /* when we drop a buffer, we're creating a discont on this pad */
626 selpad->discont = TRUE;
627 GST_INPUT_SELECTOR_UNLOCK (sel);
628 gst_buffer_unref (buf);
630 /* figure out what to return upstream */
631 GST_OBJECT_LOCK (selpad);
632 if (selpad->always_ok || !active_pad_pushed)
635 res = GST_FLOW_NOT_LINKED;
636 GST_OBJECT_UNLOCK (selpad);
642 GST_DEBUG_OBJECT (pad, "We are flushing, discard buffer %p", buf);
643 GST_INPUT_SELECTOR_UNLOCK (sel);
644 gst_buffer_unref (buf);
645 res = GST_FLOW_WRONG_STATE;
650 static void gst_input_selector_dispose (GObject * object);
652 static void gst_input_selector_set_property (GObject * object,
653 guint prop_id, const GValue * value, GParamSpec * pspec);
654 static void gst_input_selector_get_property (GObject * object,
655 guint prop_id, GValue * value, GParamSpec * pspec);
657 static GstPad *gst_input_selector_request_new_pad (GstElement * element,
658 GstPadTemplate * templ, const gchar * unused, const GstCaps * caps);
659 static void gst_input_selector_release_pad (GstElement * element, GstPad * pad);
661 static GstStateChangeReturn gst_input_selector_change_state (GstElement *
662 element, GstStateChange transition);
664 static GstCaps *gst_input_selector_getcaps (GstPad * pad, GstCaps * filter);
665 static gboolean gst_input_selector_event (GstPad * pad, GstEvent * event);
666 static gboolean gst_input_selector_query (GstPad * pad, GstQuery ** query);
667 static gint64 gst_input_selector_block (GstInputSelector * self);
668 static void gst_input_selector_switch (GstInputSelector * self,
669 GstPad * pad, gint64 stop_time, gint64 start_time);
671 /* FIXME: create these marshallers using glib-genmarshal */
672 #define g_marshal_value_peek_object(v) (v)->data[0].v_pointer
673 #define g_marshal_value_peek_int64(v) (v)->data[0].v_int64
676 gst_input_selector_marshal_INT64__VOID (GClosure * closure,
677 GValue * return_value G_GNUC_UNUSED,
678 guint n_param_values,
679 const GValue * param_values,
680 gpointer invocation_hint G_GNUC_UNUSED, gpointer marshal_data)
682 typedef gint64 (*GMarshalFunc_INT64__VOID) (gpointer data1, gpointer data2);
683 register GMarshalFunc_INT64__VOID callback;
684 register GCClosure *cc = (GCClosure *) closure;
685 register gpointer data1, data2;
688 g_return_if_fail (return_value != NULL);
689 g_return_if_fail (n_param_values == 1);
691 if (G_CCLOSURE_SWAP_DATA (closure)) {
692 data1 = closure->data;
693 data2 = g_value_peek_pointer (param_values + 0);
695 data1 = g_value_peek_pointer (param_values + 0);
696 data2 = closure->data;
699 (GMarshalFunc_INT64__VOID) (marshal_data ? marshal_data : cc->callback);
701 v_return = callback (data1, data2);
703 g_value_set_int64 (return_value, v_return);
707 gst_input_selector_marshal_VOID__OBJECT_INT64_INT64 (GClosure * closure,
708 GValue * return_value G_GNUC_UNUSED,
709 guint n_param_values,
710 const GValue * param_values,
711 gpointer invocation_hint G_GNUC_UNUSED, gpointer marshal_data)
713 typedef void (*GMarshalFunc_VOID__OBJECT_INT64_INT64) (gpointer data1,
714 gpointer arg_1, gint64 arg_2, gint64 arg_3, gpointer data2);
715 register GMarshalFunc_VOID__OBJECT_INT64_INT64 callback;
716 register GCClosure *cc = (GCClosure *) closure;
717 register gpointer data1, data2;
719 g_return_if_fail (n_param_values == 4);
721 if (G_CCLOSURE_SWAP_DATA (closure)) {
722 data1 = closure->data;
723 data2 = g_value_peek_pointer (param_values + 0);
725 data1 = g_value_peek_pointer (param_values + 0);
726 data2 = closure->data;
729 (GMarshalFunc_VOID__OBJECT_INT64_INT64) (marshal_data ? marshal_data :
733 g_marshal_value_peek_object (param_values + 1),
734 g_marshal_value_peek_int64 (param_values + 2),
735 g_marshal_value_peek_int64 (param_values + 3), data2);
739 GST_DEBUG_CATEGORY_INIT (input_selector_debug, \
740 "input-selector", 0, "An input stream selector element");
741 #define gst_input_selector_parent_class parent_class
742 G_DEFINE_TYPE_WITH_CODE (GstInputSelector, gst_input_selector, GST_TYPE_ELEMENT,
746 gst_input_selector_class_init (GstInputSelectorClass * klass)
748 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
749 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
751 gobject_class->dispose = gst_input_selector_dispose;
753 gobject_class->set_property = gst_input_selector_set_property;
754 gobject_class->get_property = gst_input_selector_get_property;
756 g_object_class_install_property (gobject_class, PROP_N_PADS,
757 g_param_spec_uint ("n-pads", "Number of Pads",
758 "The number of sink pads", 0, G_MAXUINT, 0,
759 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
761 g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD,
762 g_param_spec_object ("active-pad", "Active pad",
763 "The currently active sink pad", GST_TYPE_PAD,
764 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
767 * GstInputSelector::block:
768 * @inputselector: the #GstInputSelector
770 * Block all sink pads in preparation for a switch. Returns the stop time of
771 * the current switch segment, as a running time, or 0 if there is no current
772 * active pad or the current active pad never received data.
774 gst_input_selector_signals[SIGNAL_BLOCK] =
775 g_signal_new ("block", G_TYPE_FROM_CLASS (klass),
776 G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
777 G_STRUCT_OFFSET (GstInputSelectorClass, block), NULL, NULL,
778 gst_input_selector_marshal_INT64__VOID, G_TYPE_INT64, 0);
780 * GstInputSelector::switch:
781 * @inputselector: the #GstInputSelector
782 * @pad: the pad to switch to
783 * @stop_time: running time at which to close the previous segment, or -1
784 * to use the running time of the previously active sink pad
785 * @start_time: running time at which to start the new segment, or -1 to
786 * use the running time of the newly active sink pad
788 * Switch to a new feed. The segment opened by the previously active pad, if
789 * any, will be closed, and a new segment opened before data flows again.
791 * This signal must be emitted when the element has been blocked via the <link
792 * linkend="GstInputSelector-block">block</link> signal.
794 * If you have a stream with only one switch element, such as an audio-only
795 * stream, a stream switch should be performed by first emitting the block
796 * signal, and then emitting the switch signal with -1 for the stop and start
799 * The intention of the @stop_time and @start_time arguments is to allow
800 * multiple switch elements to switch and maintain stream synchronization.
801 * When switching a stream with multiple feeds, you will need as many switch
802 * elements as you have feeds. For example, a feed with audio and video will
803 * have one switch element between the audio feeds and one for video.
805 * A switch over multiple switch elements should be performed as follows:
806 * First, emit the <link linkend="GstInputSelector-block">block</link>
807 * signal, collecting the returned values. The maximum running time returned
808 * by block should then be used as the time at which to close the previous
811 * Then, query the running times of the new audio and video pads that you will
812 * switch to. Naturally, these pads are on separate switch elements. Take the
813 * minimum running time for those streams and use it for the time at which to
814 * open the new segment.
816 * If @pad is the same as the current active pad, the element will cancel any
817 * previous block without adjusting segments.
820 * the signal changed from accepting the pad name to the pad object.
825 gst_input_selector_signals[SIGNAL_SWITCH] =
826 g_signal_new ("switch", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
827 G_STRUCT_OFFSET (GstInputSelectorClass, switch_),
828 NULL, NULL, gst_input_selector_marshal_VOID__OBJECT_INT64_INT64,
829 G_TYPE_NONE, 3, GST_TYPE_PAD, G_TYPE_INT64, G_TYPE_INT64);
831 gst_element_class_set_details_simple (gstelement_class, "Input selector",
832 "Generic", "N-to-1 input stream selector",
833 "Julien Moutte <julien@moutte.net>, "
834 "Jan Schmidt <thaytan@mad.scientist.com>, "
835 "Wim Taymans <wim.taymans@gmail.com>");
836 gst_element_class_add_pad_template (gstelement_class,
837 gst_static_pad_template_get (&gst_input_selector_sink_factory));
838 gst_element_class_add_pad_template (gstelement_class,
839 gst_static_pad_template_get (&gst_input_selector_src_factory));
841 gstelement_class->request_new_pad = gst_input_selector_request_new_pad;
842 gstelement_class->release_pad = gst_input_selector_release_pad;
843 gstelement_class->change_state = gst_input_selector_change_state;
845 klass->block = GST_DEBUG_FUNCPTR (gst_input_selector_block);
846 /* note the underscore because switch is a keyword otherwise */
847 klass->switch_ = GST_DEBUG_FUNCPTR (gst_input_selector_switch);
851 gst_input_selector_init (GstInputSelector * sel)
853 sel->srcpad = gst_pad_new ("src", GST_PAD_SRC);
854 gst_pad_set_iterate_internal_links_function (sel->srcpad,
855 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
856 gst_pad_set_getcaps_function (sel->srcpad,
857 GST_DEBUG_FUNCPTR (gst_input_selector_getcaps));
858 gst_pad_set_query_function (sel->srcpad,
859 GST_DEBUG_FUNCPTR (gst_input_selector_query));
860 gst_pad_set_event_function (sel->srcpad,
861 GST_DEBUG_FUNCPTR (gst_input_selector_event));
862 gst_element_add_pad (GST_ELEMENT (sel), sel->srcpad);
863 /* sinkpad management */
864 sel->active_sinkpad = NULL;
866 gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED);
868 sel->lock = g_mutex_new ();
869 sel->cond = g_cond_new ();
870 sel->blocked = FALSE;
874 gst_input_selector_dispose (GObject * object)
876 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
878 if (sel->active_sinkpad) {
879 gst_object_unref (sel->active_sinkpad);
880 sel->active_sinkpad = NULL;
883 g_mutex_free (sel->lock);
887 g_cond_free (sel->cond);
891 G_OBJECT_CLASS (parent_class)->dispose (object);
894 /* Solve the following equation for B.timestamp, and set that as the segment
896 * B.running_time = (B.timestamp - NS.start) / NS.abs_rate + NS.accum
899 gst_segment_get_timestamp (GstSegment * segment, gint64 running_time)
901 if (running_time <= segment->base)
902 return segment->start;
904 return (running_time - segment->base) * ABS (segment->rate) +
909 gst_segment_set_stop (GstSegment * segment, gint64 running_time)
911 segment->stop = gst_segment_get_timestamp (segment, running_time);
912 segment->position = -1;
916 gst_segment_set_start (GstSegment * segment, gint64 running_time)
918 gint64 new_start, duration;
920 new_start = gst_segment_get_timestamp (segment, running_time);
922 /* this is the duration we skipped */
923 duration = new_start - segment->start;
924 /* add the duration to the accumulated segment time */
925 segment->base += duration;
926 /* move position in the segment */
927 segment->time += duration;
928 segment->start += duration;
931 /* this function must be called with the SELECTOR_LOCK. It returns TRUE when the
932 * active pad changed. */
934 gst_input_selector_set_active_pad (GstInputSelector * self,
935 GstPad * pad, gint64 stop_time, gint64 start_time)
937 GstSelectorPad *old, *new;
938 GstPad **active_pad_p;
940 if (pad == self->active_sinkpad)
943 old = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
944 new = GST_SELECTOR_PAD_CAST (pad);
946 GST_DEBUG_OBJECT (self, "setting active pad to %s:%s",
947 GST_DEBUG_PAD_NAME (new));
949 if (!GST_CLOCK_TIME_IS_VALID (stop_time) && old) {
950 /* no stop time given, get the latest running_time on the active pad to
951 * close and open the new segment */
952 stop_time = start_time = gst_selector_pad_get_running_time (old);
953 GST_DEBUG_OBJECT (self, "using start/stop of %" GST_TIME_FORMAT,
954 GST_TIME_ARGS (start_time));
957 if (old && old->active && !self->pending_close && stop_time >= 0) {
958 /* schedule a last_stop update if one isn't already scheduled, and a
959 segment has been pushed before. */
960 memcpy (&self->segment, &old->segment, sizeof (self->segment));
962 GST_DEBUG_OBJECT (self, "setting stop_time to %" GST_TIME_FORMAT,
963 GST_TIME_ARGS (stop_time));
964 gst_segment_set_stop (&self->segment, stop_time);
965 self->pending_close = TRUE;
970 if (new && new->active && start_time >= 0) {
971 GST_DEBUG_OBJECT (self, "setting start_time to %" GST_TIME_FORMAT,
972 GST_TIME_ARGS (start_time));
973 /* schedule a new segment push */
974 gst_segment_set_start (&new->segment, start_time);
975 new->segment_pending = TRUE;
980 active_pad_p = &self->active_sinkpad;
981 gst_object_replace ((GstObject **) active_pad_p, GST_OBJECT_CAST (pad));
982 GST_DEBUG_OBJECT (self, "New active pad is %" GST_PTR_FORMAT,
983 self->active_sinkpad);
989 gst_input_selector_set_property (GObject * object, guint prop_id,
990 const GValue * value, GParamSpec * pspec)
992 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
995 case PROP_ACTIVE_PAD:
999 pad = g_value_get_object (value);
1001 GST_INPUT_SELECTOR_LOCK (sel);
1002 gst_input_selector_set_active_pad (sel, pad,
1003 GST_CLOCK_TIME_NONE, GST_CLOCK_TIME_NONE);
1004 GST_INPUT_SELECTOR_UNLOCK (sel);
1008 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1014 gst_input_selector_get_property (GObject * object, guint prop_id,
1015 GValue * value, GParamSpec * pspec)
1017 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
1021 GST_INPUT_SELECTOR_LOCK (object);
1022 g_value_set_uint (value, sel->n_pads);
1023 GST_INPUT_SELECTOR_UNLOCK (object);
1025 case PROP_ACTIVE_PAD:
1026 GST_INPUT_SELECTOR_LOCK (object);
1027 g_value_set_object (value, sel->active_sinkpad);
1028 GST_INPUT_SELECTOR_UNLOCK (object);
1031 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1037 gst_input_selector_get_linked_pad (GstInputSelector * sel, GstPad * pad,
1040 GstPad *otherpad = NULL;
1042 GST_INPUT_SELECTOR_LOCK (sel);
1043 if (pad == sel->srcpad)
1044 otherpad = sel->active_sinkpad;
1045 else if (pad == sel->active_sinkpad || !strict)
1046 otherpad = sel->srcpad;
1048 gst_object_ref (otherpad);
1049 GST_INPUT_SELECTOR_UNLOCK (sel);
1055 gst_input_selector_event (GstPad * pad, GstEvent * event)
1057 GstInputSelector *sel;
1058 gboolean res = FALSE;
1061 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
1062 if (G_UNLIKELY (sel == NULL)) {
1063 gst_event_unref (event);
1067 otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE);
1069 res = gst_pad_push_event (otherpad, event);
1071 gst_object_unref (otherpad);
1073 gst_event_unref (event);
1075 gst_object_unref (sel);
1079 /* query on the srcpad. We override this function because by default it will
1080 * only forward the query to one random sinkpad */
1082 gst_input_selector_query (GstPad * pad, GstQuery ** query)
1084 gboolean res = TRUE;
1085 GstInputSelector *sel;
1088 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
1089 if (G_UNLIKELY (sel == NULL))
1092 otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE);
1094 switch (GST_QUERY_TYPE (*query)) {
1095 case GST_QUERY_LATENCY:
1098 GstClockTime resmin, resmax;
1105 /* assume FALSE, we become TRUE if one query succeeds */
1108 /* perform the query on all sinkpads and combine the results. We take the
1109 * max of min and the min of max for the result latency. */
1110 GST_INPUT_SELECTOR_LOCK (sel);
1111 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk;
1112 walk = g_list_next (walk)) {
1113 GstPad *sinkpad = GST_PAD_CAST (walk->data);
1115 if (gst_pad_peer_query (sinkpad, query)) {
1116 GstClockTime min, max;
1119 /* one query succeeded, we succeed too */
1122 gst_query_parse_latency (*query, &live, &min, &max);
1124 GST_DEBUG_OBJECT (sinkpad,
1125 "peer latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1126 ", live %d", GST_TIME_ARGS (min), GST_TIME_ARGS (max), live);
1133 else if (max < resmax)
1135 if (reslive == FALSE)
1140 GST_INPUT_SELECTOR_UNLOCK (sel);
1142 gst_query_set_latency (*query, reslive, resmin, resmax);
1144 GST_DEBUG_OBJECT (sel,
1145 "total latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1146 ", live %d", GST_TIME_ARGS (resmin), GST_TIME_ARGS (resmax),
1154 res = gst_pad_peer_query (otherpad, query);
1158 gst_object_unref (otherpad);
1159 gst_object_unref (sel);
1165 gst_input_selector_getcaps (GstPad * pad, GstCaps * filter)
1168 GstInputSelector *sel;
1171 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
1172 if (G_UNLIKELY (sel == NULL))
1173 return (filter ? gst_caps_ref (filter) : gst_caps_new_any ());
1175 otherpad = gst_input_selector_get_linked_pad (sel, pad, FALSE);
1178 GST_DEBUG_OBJECT (pad, "Pad not linked, returning ANY");
1179 caps = (filter ? gst_caps_ref (filter) : gst_caps_new_any ());
1181 GST_DEBUG_OBJECT (pad, "Pad is linked (to %s:%s), returning peer caps",
1182 GST_DEBUG_PAD_NAME (otherpad));
1183 /* if the peer has caps, use those. If the pad is not linked, this function
1184 * returns NULL and we return ANY */
1185 if (!(caps = gst_pad_peer_get_caps (otherpad, filter)))
1186 caps = (filter ? gst_caps_ref (filter) : gst_caps_new_any ());
1187 gst_object_unref (otherpad);
1190 gst_object_unref (sel);
1194 /* check if the pad is the active sinkpad */
1195 static inline gboolean
1196 gst_input_selector_is_active_sinkpad (GstInputSelector * sel, GstPad * pad)
1200 GST_INPUT_SELECTOR_LOCK (sel);
1201 res = (pad == sel->active_sinkpad);
1202 GST_INPUT_SELECTOR_UNLOCK (sel);
1207 /* Get or create the active sinkpad, must be called with SELECTOR_LOCK */
1209 gst_input_selector_activate_sinkpad (GstInputSelector * sel, GstPad * pad)
1211 GstPad *active_sinkpad;
1212 GstSelectorPad *selpad;
1214 selpad = GST_SELECTOR_PAD_CAST (pad);
1216 selpad->active = TRUE;
1217 active_sinkpad = sel->active_sinkpad;
1218 if (active_sinkpad == NULL) {
1219 /* first pad we get activity on becomes the activated pad by default */
1220 if (sel->active_sinkpad)
1221 gst_object_unref (sel->active_sinkpad);
1222 active_sinkpad = sel->active_sinkpad = gst_object_ref (pad);
1223 GST_DEBUG_OBJECT (sel, "Activating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1226 return active_sinkpad;
1230 gst_input_selector_request_new_pad (GstElement * element,
1231 GstPadTemplate * templ, const gchar * unused, const GstCaps * caps)
1233 GstInputSelector *sel;
1235 GstPad *sinkpad = NULL;
1237 g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL);
1239 sel = GST_INPUT_SELECTOR (element);
1241 GST_INPUT_SELECTOR_LOCK (sel);
1243 GST_LOG_OBJECT (sel, "Creating new pad %d", sel->padcount);
1244 name = g_strdup_printf ("sink%d", sel->padcount++);
1245 sinkpad = g_object_new (GST_TYPE_SELECTOR_PAD,
1246 "name", name, "direction", templ->direction, "template", templ, NULL);
1251 gst_pad_set_event_function (sinkpad,
1252 GST_DEBUG_FUNCPTR (gst_selector_pad_event));
1253 gst_pad_set_getcaps_function (sinkpad,
1254 GST_DEBUG_FUNCPTR (gst_selector_pad_getcaps));
1255 gst_pad_set_acceptcaps_function (sinkpad,
1256 GST_DEBUG_FUNCPTR (gst_selector_pad_acceptcaps));
1257 gst_pad_set_chain_function (sinkpad,
1258 GST_DEBUG_FUNCPTR (gst_selector_pad_chain));
1259 gst_pad_set_iterate_internal_links_function (sinkpad,
1260 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
1262 gst_pad_set_active (sinkpad, TRUE);
1263 gst_element_add_pad (GST_ELEMENT (sel), sinkpad);
1264 GST_INPUT_SELECTOR_UNLOCK (sel);
1270 gst_input_selector_release_pad (GstElement * element, GstPad * pad)
1272 GstInputSelector *sel;
1274 sel = GST_INPUT_SELECTOR (element);
1275 GST_LOG_OBJECT (sel, "Releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1277 GST_INPUT_SELECTOR_LOCK (sel);
1278 /* if the pad was the active pad, makes us select a new one */
1279 if (sel->active_sinkpad == pad) {
1280 GST_DEBUG_OBJECT (sel, "Deactivating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1281 gst_object_unref (sel->active_sinkpad);
1282 sel->active_sinkpad = NULL;
1286 gst_pad_set_active (pad, FALSE);
1287 gst_element_remove_pad (GST_ELEMENT (sel), pad);
1288 GST_INPUT_SELECTOR_UNLOCK (sel);
1292 gst_input_selector_reset (GstInputSelector * sel)
1296 GST_INPUT_SELECTOR_LOCK (sel);
1297 /* clear active pad */
1298 if (sel->active_sinkpad) {
1299 gst_object_unref (sel->active_sinkpad);
1300 sel->active_sinkpad = NULL;
1303 gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED);
1304 sel->pending_close = FALSE;
1305 /* reset each of our sinkpads state */
1306 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
1307 GstSelectorPad *selpad = GST_SELECTOR_PAD_CAST (walk->data);
1309 gst_selector_pad_reset (selpad);
1312 gst_tag_list_free (selpad->tags);
1313 selpad->tags = NULL;
1316 GST_INPUT_SELECTOR_UNLOCK (sel);
1319 static GstStateChangeReturn
1320 gst_input_selector_change_state (GstElement * element,
1321 GstStateChange transition)
1323 GstInputSelector *self = GST_INPUT_SELECTOR (element);
1324 GstStateChangeReturn result;
1326 switch (transition) {
1327 case GST_STATE_CHANGE_READY_TO_PAUSED:
1328 GST_INPUT_SELECTOR_LOCK (self);
1329 self->blocked = FALSE;
1330 self->flushing = FALSE;
1331 GST_INPUT_SELECTOR_UNLOCK (self);
1333 case GST_STATE_CHANGE_PAUSED_TO_READY:
1334 /* first unlock before we call the parent state change function, which
1335 * tries to acquire the stream lock when going to ready. */
1336 GST_INPUT_SELECTOR_LOCK (self);
1337 self->blocked = FALSE;
1338 self->flushing = TRUE;
1339 GST_INPUT_SELECTOR_BROADCAST (self);
1340 GST_INPUT_SELECTOR_UNLOCK (self);
1346 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1348 switch (transition) {
1349 case GST_STATE_CHANGE_PAUSED_TO_READY:
1350 gst_input_selector_reset (self);
1360 gst_input_selector_block (GstInputSelector * self)
1363 GstSelectorPad *spad;
1365 GST_INPUT_SELECTOR_LOCK (self);
1368 GST_WARNING_OBJECT (self, "switch already blocked");
1370 self->blocked = TRUE;
1371 spad = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
1374 ret = gst_selector_pad_get_running_time (spad);
1376 GST_DEBUG_OBJECT (self, "no active pad while blocking");
1378 GST_INPUT_SELECTOR_UNLOCK (self);
1383 /* stop_time and start_time are running times */
1385 gst_input_selector_switch (GstInputSelector * self, GstPad * pad,
1386 gint64 stop_time, gint64 start_time)
1390 g_return_if_fail (self->blocked == TRUE);
1392 GST_INPUT_SELECTOR_LOCK (self);
1394 gst_input_selector_set_active_pad (self, pad, stop_time, start_time);
1396 self->blocked = FALSE;
1397 GST_INPUT_SELECTOR_BROADCAST (self);
1398 GST_INPUT_SELECTOR_UNLOCK (self);
1401 NOTIFY_MUTEX_LOCK ();
1402 g_object_notify (G_OBJECT (self), "active-pad");
1403 NOTIFY_MUTEX_UNLOCK ();