f62a488c66380e7829034c8fd8cac2dec05ae8c4
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>
9 *
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.
14 *
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.
19 *
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.
24 */
26 /**
27 * SECTION:element-input-selector
28 * @see_also: #GstOutputSelector
29 *
30 * Direct one out of N input streams to the output pad.
31 *
32 * The input pads are from a GstPad subclass and have additional
33 * properties, which users may find useful, namely:
34 *
35 * <itemizedlist>
36 * <listitem>
37 * "running-time": Running time of stream on pad (#gint64)
38 * </listitem>
39 * <listitem>
40 * "tags": The currently active tags on the pad (#GstTagList, boxed type)
41 * </listitem>
42 * <listitem>
43 * "active": If the pad is currently active (#gboolean)
44 * </listitem>
45 * <listitem>
46 * "always-ok" : Make an inactive pads return #GST_FLOW_OK instead of
47 * #GST_FLOW_NOT_LINKED
48 * </listitem>
49 * </itemizedlist>
50 *
51 * Since: 0.10.32
52 */
54 #ifdef HAVE_CONFIG_H
55 #include "config.h"
56 #endif
58 #include <string.h>
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()
68 #else
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)
72 #endif
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",
84 GST_PAD_SINK,
85 GST_PAD_REQUEST,
86 GST_STATIC_CAPS_ANY);
88 static GstStaticPadTemplate gst_input_selector_src_factory =
89 GST_STATIC_PAD_TEMPLATE ("src",
90 GST_PAD_SRC,
91 GST_PAD_ALWAYS,
92 GST_STATIC_CAPS_ANY);
94 enum
95 {
96 PROP_0,
97 PROP_N_PADS,
98 PROP_ACTIVE_PAD,
99 PROP_SYNC_STREAMS
100 };
102 #define DEFAULT_SYNC_STREAMS FALSE
104 #define DEFAULT_PAD_ALWAYS_OK TRUE
106 enum
107 {
108 PROP_PAD_0,
109 PROP_PAD_RUNNING_TIME,
110 PROP_PAD_TAGS,
111 PROP_PAD_ACTIVE,
112 PROP_PAD_ALWAYS_OK
113 };
115 enum
116 {
117 /* methods */
118 SIGNAL_BLOCK,
119 SIGNAL_SWITCH,
120 LAST_SIGNAL
121 };
122 static guint gst_input_selector_signals[LAST_SIGNAL] = { 0 };
124 static inline gboolean gst_input_selector_is_active_sinkpad (GstInputSelector *
125 sel, GstPad * pad);
126 static GstPad *gst_input_selector_activate_sinkpad (GstInputSelector * sel,
127 GstPad * pad);
128 static GstPad *gst_input_selector_get_linked_pad (GstInputSelector * sel,
129 GstPad * pad, gboolean strict);
131 #define GST_TYPE_SELECTOR_PAD \
132 (gst_selector_pad_get_type())
133 #define GST_SELECTOR_PAD(obj) \
134 (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_SELECTOR_PAD, GstSelectorPad))
135 #define GST_SELECTOR_PAD_CLASS(klass) \
136 (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_SELECTOR_PAD, GstSelectorPadClass))
137 #define GST_IS_SELECTOR_PAD(obj) \
138 (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_SELECTOR_PAD))
139 #define GST_IS_SELECTOR_PAD_CLASS(klass) \
140 (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_SELECTOR_PAD))
141 #define GST_SELECTOR_PAD_CAST(obj) \
142 ((GstSelectorPad *)(obj))
144 typedef struct _GstSelectorPad GstSelectorPad;
145 typedef struct _GstSelectorPadClass GstSelectorPadClass;
147 struct _GstSelectorPad
148 {
149 GstPad parent;
151 gboolean active; /* when buffer have passed the pad */
152 gboolean pushed; /* when buffer was pushed downstream since activation */
153 gboolean eos; /* when EOS has been received */
154 gboolean eos_sent; /* when EOS was sent downstream */
155 gboolean discont; /* after switching we create a discont */
156 gboolean flushing; /* set after flush-start and before flush-stop */
157 gboolean always_ok;
158 GstSegment segment; /* the current segment on the pad */
159 GstTagList *tags; /* last tags received on the pad */
161 gboolean segment_pending;
162 };
164 struct _GstSelectorPadClass
165 {
166 GstPadClass parent;
167 };
169 static void gst_selector_pad_class_init (GstSelectorPadClass * klass);
170 static void gst_selector_pad_init (GstSelectorPad * pad);
171 static void gst_selector_pad_finalize (GObject * object);
172 static void gst_selector_pad_get_property (GObject * object,
173 guint prop_id, GValue * value, GParamSpec * pspec);
174 static void gst_selector_pad_set_property (GObject * object,
175 guint prop_id, const GValue * value, GParamSpec * pspec);
177 static GstPadClass *selector_pad_parent_class = NULL;
179 static gint64 gst_selector_pad_get_running_time (GstSelectorPad * pad);
180 static void gst_selector_pad_reset (GstSelectorPad * pad);
181 static gboolean gst_selector_pad_event (GstPad * pad, GstEvent * event);
182 static GstCaps *gst_selector_pad_getcaps (GstPad * pad);
183 static gboolean gst_selector_pad_acceptcaps (GstPad * pad, GstCaps * caps);
184 static GstIterator *gst_selector_pad_iterate_linked_pads (GstPad * pad);
185 static GstFlowReturn gst_selector_pad_chain (GstPad * pad, GstBuffer * buf);
186 static GstFlowReturn gst_selector_pad_bufferalloc (GstPad * pad,
187 guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
189 static GType
190 gst_selector_pad_get_type (void)
191 {
192 static volatile gsize selector_pad_type = 0;
193 static const GTypeInfo selector_pad_info = {
194 sizeof (GstSelectorPadClass),
195 NULL,
196 NULL,
197 (GClassInitFunc) gst_selector_pad_class_init,
198 NULL,
199 NULL,
200 sizeof (GstSelectorPad),
201 0,
202 (GInstanceInitFunc) gst_selector_pad_init,
203 };
205 if (g_once_init_enter (&selector_pad_type)) {
206 GType tmp = g_type_register_static (GST_TYPE_PAD, "GstSelectorPad",
207 &selector_pad_info, 0);
208 g_once_init_leave (&selector_pad_type, tmp);
209 }
211 return (GType) selector_pad_type;
212 }
214 static void
215 gst_selector_pad_class_init (GstSelectorPadClass * klass)
216 {
217 GObjectClass *gobject_class;
219 gobject_class = (GObjectClass *) klass;
221 selector_pad_parent_class = g_type_class_peek_parent (klass);
223 gobject_class->finalize = gst_selector_pad_finalize;
225 gobject_class->get_property = gst_selector_pad_get_property;
226 gobject_class->set_property = gst_selector_pad_set_property;
228 g_object_class_install_property (gobject_class, PROP_PAD_RUNNING_TIME,
229 g_param_spec_int64 ("running-time", "Running time",
230 "Running time of stream on pad", 0, G_MAXINT64, 0,
231 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
232 g_object_class_install_property (gobject_class, PROP_PAD_TAGS,
233 g_param_spec_boxed ("tags", "Tags",
234 "The currently active tags on the pad", GST_TYPE_TAG_LIST,
235 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
236 g_object_class_install_property (gobject_class, PROP_PAD_ACTIVE,
237 g_param_spec_boolean ("active", "Active",
238 "If the pad is currently active", FALSE,
239 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
240 /* FIXME: better property name? */
241 g_object_class_install_property (gobject_class, PROP_PAD_ALWAYS_OK,
242 g_param_spec_boolean ("always-ok", "Always OK",
243 "Make an inactive pad return OK instead of NOT_LINKED",
244 DEFAULT_PAD_ALWAYS_OK, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
245 }
247 static void
248 gst_selector_pad_init (GstSelectorPad * pad)
249 {
250 pad->always_ok = DEFAULT_PAD_ALWAYS_OK;
251 gst_selector_pad_reset (pad);
252 }
254 static void
255 gst_selector_pad_finalize (GObject * object)
256 {
257 GstSelectorPad *pad;
259 pad = GST_SELECTOR_PAD_CAST (object);
261 if (pad->tags)
262 gst_tag_list_free (pad->tags);
264 G_OBJECT_CLASS (selector_pad_parent_class)->finalize (object);
265 }
267 static void
268 gst_selector_pad_set_property (GObject * object, guint prop_id,
269 const GValue * value, GParamSpec * pspec)
270 {
271 GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
273 switch (prop_id) {
274 case PROP_PAD_ALWAYS_OK:
275 GST_OBJECT_LOCK (object);
276 spad->always_ok = g_value_get_boolean (value);
277 GST_OBJECT_UNLOCK (object);
278 break;
279 default:
280 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
281 break;
282 }
283 }
285 static void
286 gst_selector_pad_get_property (GObject * object, guint prop_id,
287 GValue * value, GParamSpec * pspec)
288 {
289 GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
291 switch (prop_id) {
292 case PROP_PAD_RUNNING_TIME:
293 g_value_set_int64 (value, gst_selector_pad_get_running_time (spad));
294 break;
295 case PROP_PAD_TAGS:
296 GST_OBJECT_LOCK (object);
297 g_value_set_boxed (value, spad->tags);
298 GST_OBJECT_UNLOCK (object);
299 break;
300 case PROP_PAD_ACTIVE:
301 {
302 GstInputSelector *sel;
304 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (spad));
305 g_value_set_boolean (value, gst_input_selector_is_active_sinkpad (sel,
306 GST_PAD_CAST (spad)));
307 gst_object_unref (sel);
308 break;
309 }
310 case PROP_PAD_ALWAYS_OK:
311 GST_OBJECT_LOCK (object);
312 g_value_set_boolean (value, spad->always_ok);
313 GST_OBJECT_UNLOCK (object);
314 break;
315 default:
316 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
317 break;
318 }
319 }
321 static gint64
322 gst_selector_pad_get_running_time (GstSelectorPad * pad)
323 {
324 gint64 ret = 0;
326 GST_OBJECT_LOCK (pad);
327 if (pad->active) {
328 gint64 last_stop = pad->segment.last_stop;
330 if (last_stop >= 0)
331 ret = gst_segment_to_running_time (&pad->segment, GST_FORMAT_TIME,
332 last_stop);
333 }
334 GST_OBJECT_UNLOCK (pad);
336 GST_DEBUG_OBJECT (pad, "running time: %" GST_TIME_FORMAT,
337 GST_TIME_ARGS (ret));
339 return ret;
340 }
342 static void
343 gst_selector_pad_reset (GstSelectorPad * pad)
344 {
345 GST_OBJECT_LOCK (pad);
346 pad->active = FALSE;
347 pad->pushed = FALSE;
348 pad->eos = FALSE;
349 pad->eos_sent = FALSE;
350 pad->segment_pending = FALSE;
351 pad->discont = FALSE;
352 pad->flushing = FALSE;
353 gst_segment_init (&pad->segment, GST_FORMAT_UNDEFINED);
354 GST_OBJECT_UNLOCK (pad);
355 }
357 /* strictly get the linked pad from the sinkpad. If the pad is active we return
358 * the srcpad else we return NULL */
359 static GstIterator *
360 gst_selector_pad_iterate_linked_pads (GstPad * pad)
361 {
362 GstInputSelector *sel;
363 GstPad *otherpad;
364 GstIterator *it;
366 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
367 if (G_UNLIKELY (sel == NULL))
368 return NULL;
370 otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE);
371 it = gst_iterator_new_single (GST_TYPE_PAD, otherpad,
372 (GstCopyFunction) gst_object_ref, (GFreeFunc) gst_object_unref);
374 if (otherpad)
375 gst_object_unref (otherpad);
376 gst_object_unref (sel);
378 return it;
379 }
381 static gboolean
382 gst_selector_pad_event (GstPad * pad, GstEvent * event)
383 {
384 gboolean res = TRUE;
385 gboolean forward;
386 GstInputSelector *sel;
387 GstSelectorPad *selpad;
388 GstPad *prev_active_sinkpad;
389 GstPad *active_sinkpad;
391 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
392 if (G_UNLIKELY (sel == NULL)) {
393 gst_event_unref (event);
394 return FALSE;
395 }
396 selpad = GST_SELECTOR_PAD_CAST (pad);
398 GST_INPUT_SELECTOR_LOCK (sel);
399 prev_active_sinkpad = sel->active_sinkpad;
400 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
402 /* only forward if we are dealing with the active sinkpad */
403 forward = (pad == active_sinkpad);
404 GST_INPUT_SELECTOR_UNLOCK (sel);
406 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) {
407 NOTIFY_MUTEX_LOCK ();
408 g_object_notify (G_OBJECT (sel), "active-pad");
409 NOTIFY_MUTEX_UNLOCK ();
410 }
412 switch (GST_EVENT_TYPE (event)) {
413 case GST_EVENT_FLUSH_START:
414 /* Unblock the pad if it's waiting */
415 GST_INPUT_SELECTOR_LOCK (sel);
416 selpad->flushing = TRUE;
417 GST_INPUT_SELECTOR_BROADCAST (sel);
418 GST_INPUT_SELECTOR_UNLOCK (sel);
419 break;
420 case GST_EVENT_FLUSH_STOP:
421 GST_INPUT_SELECTOR_LOCK (sel);
422 gst_selector_pad_reset (selpad);
423 sel->pending_close = FALSE;
424 GST_INPUT_SELECTOR_UNLOCK (sel);
425 break;
426 case GST_EVENT_NEWSEGMENT:
427 {
428 gboolean update;
429 GstFormat format;
430 gdouble rate, arate;
431 gint64 start, stop, time;
433 gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
434 &start, &stop, &time);
436 GST_DEBUG_OBJECT (pad,
437 "configured NEWSEGMENT update %d, rate %lf, applied rate %lf, "
438 "format %d, "
439 "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
440 G_GINT64_FORMAT, update, rate, arate, format, start, stop, time);
442 GST_INPUT_SELECTOR_LOCK (sel);
443 GST_OBJECT_LOCK (selpad);
444 gst_segment_set_newsegment_full (&selpad->segment, update,
445 rate, arate, format, start, stop, time);
446 GST_OBJECT_UNLOCK (selpad);
448 /* If we aren't forwarding the event because the pad is not the
449 * active_sinkpad, then set the flag on the pad
450 * that says a segment needs sending if/when that pad is activated.
451 * For all other cases, we send the event immediately, which makes
452 * sparse streams and other segment updates work correctly downstream.
453 */
454 if (!forward)
455 selpad->segment_pending = TRUE;
457 GST_INPUT_SELECTOR_UNLOCK (sel);
458 break;
459 }
460 case GST_EVENT_TAG:
461 {
462 GstTagList *tags, *oldtags, *newtags;
464 gst_event_parse_tag (event, &tags);
466 GST_OBJECT_LOCK (selpad);
467 oldtags = selpad->tags;
469 newtags = gst_tag_list_merge (oldtags, tags, GST_TAG_MERGE_REPLACE);
470 selpad->tags = newtags;
471 if (oldtags)
472 gst_tag_list_free (oldtags);
473 GST_DEBUG_OBJECT (pad, "received tags %" GST_PTR_FORMAT, newtags);
474 GST_OBJECT_UNLOCK (selpad);
476 g_object_notify (G_OBJECT (selpad), "tags");
477 break;
478 }
479 case GST_EVENT_EOS:
480 selpad->eos = TRUE;
482 if (forward) {
483 selpad->eos_sent = TRUE;
484 } else {
485 GstSelectorPad *tmp;
487 /* If the active sinkpad is in EOS state but EOS
488 * was not sent downstream this means that the pad
489 * got EOS before it was set as active pad and that
490 * the previously active pad got EOS after it was
491 * active
492 */
493 GST_INPUT_SELECTOR_LOCK (sel);
494 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
495 tmp = GST_SELECTOR_PAD (active_sinkpad);
496 forward = (tmp->eos && !tmp->eos_sent);
497 tmp->eos_sent = TRUE;
498 GST_INPUT_SELECTOR_UNLOCK (sel);
499 }
500 GST_DEBUG_OBJECT (pad, "received EOS");
501 break;
502 default:
503 break;
504 }
505 if (forward) {
506 GST_DEBUG_OBJECT (pad, "forwarding event");
507 res = gst_pad_push_event (sel->srcpad, event);
508 } else
509 gst_event_unref (event);
511 gst_object_unref (sel);
513 return res;
514 }
516 static GstCaps *
517 gst_selector_pad_getcaps (GstPad * pad)
518 {
519 GstInputSelector *sel;
520 GstCaps *caps;
522 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
523 if (G_UNLIKELY (sel == NULL))
524 return gst_caps_new_any ();
526 GST_DEBUG_OBJECT (sel, "Getting caps of srcpad peer");
527 caps = gst_pad_peer_get_caps_reffed (sel->srcpad);
528 if (caps == NULL)
529 caps = gst_caps_new_any ();
531 gst_object_unref (sel);
533 return caps;
534 }
536 static gboolean
537 gst_selector_pad_acceptcaps (GstPad * pad, GstCaps * caps)
538 {
539 GstInputSelector *sel;
540 gboolean res;
542 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
543 if (G_UNLIKELY (sel == NULL))
544 return FALSE;
546 GST_DEBUG_OBJECT (sel, "Checking acceptcaps of srcpad peer");
547 res = gst_pad_peer_accept_caps (sel->srcpad, caps);
548 gst_object_unref (sel);
550 return res;
551 }
553 static GstFlowReturn
554 gst_selector_pad_bufferalloc (GstPad * pad, guint64 offset,
555 guint size, GstCaps * caps, GstBuffer ** buf)
556 {
557 GstInputSelector *sel;
558 GstFlowReturn result;
559 GstPad *active_sinkpad;
560 GstPad *prev_active_sinkpad;
561 GstSelectorPad *selpad;
563 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
564 if (G_UNLIKELY (sel == NULL))
565 return GST_FLOW_WRONG_STATE;
567 selpad = GST_SELECTOR_PAD_CAST (pad);
569 GST_LOG_OBJECT (pad, "received alloc");
571 GST_INPUT_SELECTOR_LOCK (sel);
572 prev_active_sinkpad = sel->active_sinkpad;
573 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
575 if (pad != active_sinkpad)
576 goto not_active;
578 GST_INPUT_SELECTOR_UNLOCK (sel);
580 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) {
581 NOTIFY_MUTEX_LOCK ();
582 g_object_notify (G_OBJECT (sel), "active-pad");
583 NOTIFY_MUTEX_UNLOCK ();
584 }
586 result = gst_pad_alloc_buffer (sel->srcpad, offset, size, caps, buf);
588 done:
589 gst_object_unref (sel);
591 return result;
593 /* ERRORS */
594 not_active:
595 {
596 gboolean active_pad_pushed = GST_SELECTOR_PAD_CAST (active_sinkpad)->pushed;
598 GST_INPUT_SELECTOR_UNLOCK (sel);
600 /* unselected pad, perform fallback alloc or return unlinked when
601 * asked */
602 GST_OBJECT_LOCK (selpad);
603 if (selpad->always_ok || !active_pad_pushed) {
604 GST_DEBUG_OBJECT (pad, "Not selected, performing fallback allocation");
605 *buf = NULL;
606 result = GST_FLOW_OK;
607 } else {
608 GST_DEBUG_OBJECT (pad, "Not selected, return NOT_LINKED");
609 result = GST_FLOW_NOT_LINKED;
610 }
611 GST_OBJECT_UNLOCK (selpad);
613 goto done;
614 }
615 }
617 /* must be called with the SELECTOR_LOCK, will block while the pad is blocked
618 * or return TRUE when flushing */
619 static gboolean
620 gst_input_selector_wait (GstInputSelector * self, GstSelectorPad * pad)
621 {
622 while (self->blocked && !self->flushing && !pad->flushing) {
623 /* we can be unlocked here when we are shutting down (flushing) or when we
624 * get unblocked */
625 GST_INPUT_SELECTOR_WAIT (self);
626 }
627 return self->flushing;
628 }
630 /* must be called with the SELECTOR_LOCK, will block until the running time
631 * of the active pad is after this pad or return TRUE when flushing */
632 static gboolean
633 gst_input_selector_wait_running_time (GstInputSelector * sel,
634 GstSelectorPad * pad, GstBuffer * buf)
635 {
636 GstPad *active_sinkpad;
637 GstSelectorPad *active_selpad;
638 GstSegment *seg, *active_seg;
639 GstClockTime running_time, active_running_time = -1;
641 seg = &pad->segment;
643 active_sinkpad =
644 gst_input_selector_activate_sinkpad (sel, GST_PAD_CAST (pad));
645 active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad);
646 active_seg = &active_selpad->segment;
648 /* We can only sync if the segments are in time format or
649 * if the active pad had no newsegment event yet */
650 if (seg->format != GST_FORMAT_TIME ||
651 (active_seg->format != GST_FORMAT_TIME
652 && active_seg->format != GST_FORMAT_UNDEFINED))
653 return FALSE;
655 /* If we have no valid timestamp we can't sync this buffer */
656 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buf))
657 return FALSE;
659 running_time = GST_BUFFER_TIMESTAMP (buf);
660 /* If possible try to get the running time at the end of the buffer */
661 if (GST_BUFFER_DURATION_IS_VALID (buf))
662 running_time += GST_BUFFER_DURATION (buf);
663 if (running_time > seg->stop)
664 running_time = seg->stop;
665 running_time =
666 gst_segment_to_running_time (seg, GST_FORMAT_TIME, running_time);
667 /* If this is outside the segment don't sync */
668 if (running_time == -1)
669 return FALSE;
671 /* Get active pad's running time, if no configured segment yet keep at -1 */
672 if (active_seg->format == GST_FORMAT_TIME)
673 active_running_time =
674 gst_segment_to_running_time (active_seg, GST_FORMAT_TIME,
675 active_seg->last_stop);
677 /* Wait until
678 * a) this is the active pad
679 * b) the pad or the selector is flushing
680 * c) the selector is not blocked
681 * d) the active pad has no running time or the active
682 * pad's running time is before this running time
683 * e) the active pad has a non-time segment
684 */
685 while (pad != active_selpad && !sel->flushing && !pad->flushing &&
686 (sel->blocked || active_running_time == -1
687 || running_time >= active_running_time)) {
688 if (!sel->blocked)
689 GST_DEBUG_OBJECT (pad,
690 "Waiting for active streams to advance. %" GST_TIME_FORMAT " >= %"
691 GST_TIME_FORMAT, GST_TIME_ARGS (running_time),
692 GST_TIME_ARGS (active_running_time));
694 GST_INPUT_SELECTOR_WAIT (sel);
696 /* Get new active pad, it might have changed */
697 active_sinkpad =
698 gst_input_selector_activate_sinkpad (sel, GST_PAD_CAST (pad));
699 active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad);
700 active_seg = &active_selpad->segment;
702 /* If the active segment is configured but not to time format
703 * we can't do any syncing at all */
704 if (active_seg->format != GST_FORMAT_TIME
705 && active_seg->format != GST_FORMAT_UNDEFINED)
706 break;
708 /* Get the new active pad running time */
709 if (active_seg->format == GST_FORMAT_TIME)
710 active_running_time =
711 gst_segment_to_running_time (active_seg, GST_FORMAT_TIME,
712 active_seg->last_stop);
713 else
714 active_running_time = -1;
716 if (!sel->blocked)
717 GST_DEBUG_OBJECT (pad,
718 "Waited for active streams to advance. %" GST_TIME_FORMAT " >= %"
719 GST_TIME_FORMAT, GST_TIME_ARGS (running_time),
720 GST_TIME_ARGS (active_running_time));
722 }
724 /* Return TRUE if the selector or the pad is flushing */
725 return (sel->flushing || pad->flushing);
726 }
729 static GstFlowReturn
730 gst_selector_pad_chain (GstPad * pad, GstBuffer * buf)
731 {
732 GstInputSelector *sel;
733 GstFlowReturn res;
734 GstPad *active_sinkpad;
735 GstPad *prev_active_sinkpad;
736 GstSelectorPad *selpad;
737 GstClockTime start_time;
738 GstSegment *seg;
739 GstEvent *close_event = NULL, *start_event = NULL;
740 GstCaps *caps;
742 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
743 selpad = GST_SELECTOR_PAD_CAST (pad);
744 seg = &selpad->segment;
746 GST_INPUT_SELECTOR_LOCK (sel);
747 /* wait or check for flushing */
748 if (gst_input_selector_wait (sel, selpad))
749 goto flushing;
751 GST_LOG_OBJECT (pad, "getting active pad");
753 prev_active_sinkpad = sel->active_sinkpad;
754 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
756 /* In sync mode wait until the active pad has advanced
757 * after the running time of the current buffer */
758 if (sel->sync_streams && active_sinkpad != pad) {
759 if (gst_input_selector_wait_running_time (sel, selpad, buf))
760 goto flushing;
761 }
763 /* Might have changed while waiting */
764 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
766 /* update the segment on the srcpad */
767 start_time = GST_BUFFER_TIMESTAMP (buf);
768 if (GST_CLOCK_TIME_IS_VALID (start_time)) {
769 GST_LOG_OBJECT (pad, "received start time %" GST_TIME_FORMAT,
770 GST_TIME_ARGS (start_time));
771 if (GST_BUFFER_DURATION_IS_VALID (buf))
772 GST_LOG_OBJECT (pad, "received end time %" GST_TIME_FORMAT,
773 GST_TIME_ARGS (start_time + GST_BUFFER_DURATION (buf)));
775 GST_OBJECT_LOCK (pad);
776 gst_segment_set_last_stop (seg, seg->format, start_time);
777 GST_OBJECT_UNLOCK (pad);
778 }
780 /* Ignore buffers from pads except the selected one */
781 if (pad != active_sinkpad)
782 goto ignore;
784 /* Tell all non-active pads that we advanced the running time */
785 if (sel->sync_streams)
786 GST_INPUT_SELECTOR_BROADCAST (sel);
788 if (G_UNLIKELY (sel->pending_close)) {
789 GstSegment *cseg = &sel->segment;
791 GST_DEBUG_OBJECT (sel,
792 "pushing close NEWSEGMENT update %d, rate %lf, applied rate %lf, "
793 "format %d, "
794 "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
795 G_GINT64_FORMAT, TRUE, cseg->rate, cseg->applied_rate, cseg->format,
796 cseg->start, cseg->stop, cseg->time);
798 /* create update segment */
799 close_event = gst_event_new_new_segment_full (TRUE, cseg->rate,
800 cseg->applied_rate, cseg->format, cseg->start, cseg->stop, cseg->time);
802 sel->pending_close = FALSE;
803 }
804 /* if we have a pending segment, push it out now */
805 if (G_UNLIKELY (selpad->segment_pending)) {
806 GST_DEBUG_OBJECT (pad,
807 "pushing pending NEWSEGMENT update %d, rate %lf, applied rate %lf, "
808 "format %d, "
809 "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
810 G_GINT64_FORMAT, FALSE, seg->rate, seg->applied_rate, seg->format,
811 seg->start, seg->stop, seg->time);
813 start_event = gst_event_new_new_segment_full (FALSE, seg->rate,
814 seg->applied_rate, seg->format, seg->start, seg->stop, seg->time);
816 selpad->segment_pending = FALSE;
817 }
818 GST_INPUT_SELECTOR_UNLOCK (sel);
820 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) {
821 NOTIFY_MUTEX_LOCK ();
822 g_object_notify (G_OBJECT (sel), "active-pad");
823 NOTIFY_MUTEX_UNLOCK ();
824 }
826 if (close_event)
827 gst_pad_push_event (sel->srcpad, close_event);
829 if (start_event)
830 gst_pad_push_event (sel->srcpad, start_event);
832 if (selpad->discont) {
833 buf = gst_buffer_make_metadata_writable (buf);
835 GST_DEBUG_OBJECT (pad, "Marking discont buffer %p", buf);
836 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
837 selpad->discont = FALSE;
838 }
840 /* forward */
841 GST_LOG_OBJECT (pad, "Forwarding buffer %p", buf);
843 if ((caps = GST_BUFFER_CAPS (buf))) {
844 if (GST_PAD_CAPS (sel->srcpad) != caps)
845 gst_pad_set_caps (sel->srcpad, caps);
846 }
848 res = gst_pad_push (sel->srcpad, buf);
849 selpad->pushed = TRUE;
851 done:
852 gst_object_unref (sel);
853 return res;
855 /* dropped buffers */
856 ignore:
857 {
858 gboolean active_pad_pushed = GST_SELECTOR_PAD_CAST (active_sinkpad)->pushed;
860 GST_DEBUG_OBJECT (pad, "Pad not active, discard buffer %p", buf);
861 /* when we drop a buffer, we're creating a discont on this pad */
862 selpad->discont = TRUE;
863 GST_INPUT_SELECTOR_UNLOCK (sel);
864 gst_buffer_unref (buf);
866 /* figure out what to return upstream */
867 GST_OBJECT_LOCK (selpad);
868 if (selpad->always_ok || !active_pad_pushed)
869 res = GST_FLOW_OK;
870 else
871 res = GST_FLOW_NOT_LINKED;
872 GST_OBJECT_UNLOCK (selpad);
874 goto done;
875 }
876 flushing:
877 {
878 GST_DEBUG_OBJECT (pad, "We are flushing, discard buffer %p", buf);
879 GST_INPUT_SELECTOR_UNLOCK (sel);
880 gst_buffer_unref (buf);
881 res = GST_FLOW_WRONG_STATE;
882 goto done;
883 }
884 }
886 static void gst_input_selector_dispose (GObject * object);
888 static void gst_input_selector_set_property (GObject * object,
889 guint prop_id, const GValue * value, GParamSpec * pspec);
890 static void gst_input_selector_get_property (GObject * object,
891 guint prop_id, GValue * value, GParamSpec * pspec);
893 static GstPad *gst_input_selector_request_new_pad (GstElement * element,
894 GstPadTemplate * templ, const gchar * unused);
895 static void gst_input_selector_release_pad (GstElement * element, GstPad * pad);
897 static GstStateChangeReturn gst_input_selector_change_state (GstElement *
898 element, GstStateChange transition);
900 static GstCaps *gst_input_selector_getcaps (GstPad * pad);
901 static gboolean gst_input_selector_event (GstPad * pad, GstEvent * event);
902 static gboolean gst_input_selector_query (GstPad * pad, GstQuery * query);
903 static gint64 gst_input_selector_block (GstInputSelector * self);
904 static void gst_input_selector_switch (GstInputSelector * self,
905 GstPad * pad, gint64 stop_time, gint64 start_time);
907 /* FIXME: create these marshallers using glib-genmarshal */
908 #define g_marshal_value_peek_object(v) (v)->data[0].v_pointer
909 #define g_marshal_value_peek_int64(v) (v)->data[0].v_int64
911 static void
912 gst_input_selector_marshal_INT64__VOID (GClosure * closure,
913 GValue * return_value G_GNUC_UNUSED,
914 guint n_param_values,
915 const GValue * param_values,
916 gpointer invocation_hint G_GNUC_UNUSED, gpointer marshal_data)
917 {
918 typedef gint64 (*GMarshalFunc_INT64__VOID) (gpointer data1, gpointer data2);
919 register GMarshalFunc_INT64__VOID callback;
920 register GCClosure *cc = (GCClosure *) closure;
921 register gpointer data1, data2;
922 gint64 v_return;
924 g_return_if_fail (return_value != NULL);
925 g_return_if_fail (n_param_values == 1);
927 if (G_CCLOSURE_SWAP_DATA (closure)) {
928 data1 = closure->data;
929 data2 = g_value_peek_pointer (param_values + 0);
930 } else {
931 data1 = g_value_peek_pointer (param_values + 0);
932 data2 = closure->data;
933 }
934 callback =
935 (GMarshalFunc_INT64__VOID) (marshal_data ? marshal_data : cc->callback);
937 v_return = callback (data1, data2);
939 g_value_set_int64 (return_value, v_return);
940 }
942 static void
943 gst_input_selector_marshal_VOID__OBJECT_INT64_INT64 (GClosure * closure,
944 GValue * return_value G_GNUC_UNUSED,
945 guint n_param_values,
946 const GValue * param_values,
947 gpointer invocation_hint G_GNUC_UNUSED, gpointer marshal_data)
948 {
949 typedef void (*GMarshalFunc_VOID__OBJECT_INT64_INT64) (gpointer data1,
950 gpointer arg_1, gint64 arg_2, gint64 arg_3, gpointer data2);
951 register GMarshalFunc_VOID__OBJECT_INT64_INT64 callback;
952 register GCClosure *cc = (GCClosure *) closure;
953 register gpointer data1, data2;
955 g_return_if_fail (n_param_values == 4);
957 if (G_CCLOSURE_SWAP_DATA (closure)) {
958 data1 = closure->data;
959 data2 = g_value_peek_pointer (param_values + 0);
960 } else {
961 data1 = g_value_peek_pointer (param_values + 0);
962 data2 = closure->data;
963 }
964 callback =
965 (GMarshalFunc_VOID__OBJECT_INT64_INT64) (marshal_data ? marshal_data :
966 cc->callback);
968 callback (data1,
969 g_marshal_value_peek_object (param_values + 1),
970 g_marshal_value_peek_int64 (param_values + 2),
971 g_marshal_value_peek_int64 (param_values + 3), data2);
972 }
974 #define _do_init(bla) \
975 GST_DEBUG_CATEGORY_INIT (input_selector_debug, \
976 "input-selector", 0, "An input stream selector element");
978 GST_BOILERPLATE_FULL (GstInputSelector, gst_input_selector, GstElement,
979 GST_TYPE_ELEMENT, _do_init);
981 static void
982 gst_input_selector_base_init (gpointer g_class)
983 {
984 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
986 gst_element_class_set_details_simple (element_class, "Input selector",
987 "Generic", "N-to-1 input stream selector",
988 "Julien Moutte <julien@moutte.net>, "
989 "Jan Schmidt <thaytan@mad.scientist.com>, "
990 "Wim Taymans <wim.taymans@gmail.com>");
991 gst_element_class_add_pad_template (element_class,
992 gst_static_pad_template_get (&gst_input_selector_sink_factory));
993 gst_element_class_add_pad_template (element_class,
994 gst_static_pad_template_get (&gst_input_selector_src_factory));
995 }
997 static void
998 gst_input_selector_class_init (GstInputSelectorClass * klass)
999 {
1000 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
1001 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
1003 gobject_class->dispose = gst_input_selector_dispose;
1005 gobject_class->set_property = gst_input_selector_set_property;
1006 gobject_class->get_property = gst_input_selector_get_property;
1008 g_object_class_install_property (gobject_class, PROP_N_PADS,
1009 g_param_spec_uint ("n-pads", "Number of Pads",
1010 "The number of sink pads", 0, G_MAXUINT, 0,
1011 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
1013 g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD,
1014 g_param_spec_object ("active-pad", "Active pad",
1015 "The currently active sink pad", GST_TYPE_PAD,
1016 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1018 /**
1019 * GstInputSelector:sync-streams
1020 *
1021 * If set to %TRUE all inactive streams will be synced to the
1022 * running time of the active stream. This makes sure that no
1023 * buffers are dropped by input-selector that might be needed
1024 * when switching the active pad.
1025 *
1026 * Since: 0.10.35
1027 */
1028 g_object_class_install_property (gobject_class, PROP_SYNC_STREAMS,
1029 g_param_spec_boolean ("sync-streams", "Sync Streams",
1030 "Synchronize inactive streams to the running time of the active stream",
1031 DEFAULT_SYNC_STREAMS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1033 /**
1034 * GstInputSelector::block:
1035 * @inputselector: the #GstInputSelector
1036 *
1037 * Block all sink pads in preparation for a switch. Returns the stop time of
1038 * the current switch segment, as a running time, or 0 if there is no current
1039 * active pad or the current active pad never received data.
1040 */
1041 gst_input_selector_signals[SIGNAL_BLOCK] =
1042 g_signal_new ("block", G_TYPE_FROM_CLASS (klass),
1043 G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
1044 G_STRUCT_OFFSET (GstInputSelectorClass, block), NULL, NULL,
1045 gst_input_selector_marshal_INT64__VOID, G_TYPE_INT64, 0);
1046 /**
1047 * GstInputSelector::switch:
1048 * @inputselector: the #GstInputSelector
1049 * @pad: the pad to switch to
1050 * @stop_time: running time at which to close the previous segment, or -1
1051 * to use the running time of the previously active sink pad
1052 * @start_time: running time at which to start the new segment, or -1 to
1053 * use the running time of the newly active sink pad
1054 *
1055 * Switch to a new feed. The segment opened by the previously active pad, if
1056 * any, will be closed, and a new segment opened before data flows again.
1057 *
1058 * This signal must be emitted when the element has been blocked via the <link
1059 * linkend="GstInputSelector-block">block</link> signal.
1060 *
1061 * If you have a stream with only one switch element, such as an audio-only
1062 * stream, a stream switch should be performed by first emitting the block
1063 * signal, and then emitting the switch signal with -1 for the stop and start
1064 * time values.
1065 *
1066 * The intention of the @stop_time and @start_time arguments is to allow
1067 * multiple switch elements to switch and maintain stream synchronization.
1068 * When switching a stream with multiple feeds, you will need as many switch
1069 * elements as you have feeds. For example, a feed with audio and video will
1070 * have one switch element between the audio feeds and one for video.
1071 *
1072 * A switch over multiple switch elements should be performed as follows:
1073 * First, emit the <link linkend="GstInputSelector-block">block</link>
1074 * signal, collecting the returned values. The maximum running time returned
1075 * by block should then be used as the time at which to close the previous
1076 * segment.
1077 *
1078 * Then, query the running times of the new audio and video pads that you will
1079 * switch to. Naturally, these pads are on separate switch elements. Take the
1080 * minimum running time for those streams and use it for the time at which to
1081 * open the new segment.
1082 *
1083 * If @pad is the same as the current active pad, the element will cancel any
1084 * previous block without adjusting segments.
1085 *
1086 * <note><simpara>
1087 * the signal changed from accepting the pad name to the pad object.
1088 * </simpara></note>
1089 *
1090 * Since: 0.10.7
1091 */
1092 gst_input_selector_signals[SIGNAL_SWITCH] =
1093 g_signal_new ("switch", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
1094 G_STRUCT_OFFSET (GstInputSelectorClass, switch_),
1095 NULL, NULL, gst_input_selector_marshal_VOID__OBJECT_INT64_INT64,
1096 G_TYPE_NONE, 3, GST_TYPE_PAD, G_TYPE_INT64, G_TYPE_INT64);
1098 gstelement_class->request_new_pad = gst_input_selector_request_new_pad;
1099 gstelement_class->release_pad = gst_input_selector_release_pad;
1100 gstelement_class->change_state = gst_input_selector_change_state;
1102 klass->block = GST_DEBUG_FUNCPTR (gst_input_selector_block);
1103 /* note the underscore because switch is a keyword otherwise */
1104 klass->switch_ = GST_DEBUG_FUNCPTR (gst_input_selector_switch);
1105 }
1107 static void
1108 gst_input_selector_init (GstInputSelector * sel,
1109 GstInputSelectorClass * g_class)
1110 {
1111 sel->srcpad = gst_pad_new ("src", GST_PAD_SRC);
1112 gst_pad_set_iterate_internal_links_function (sel->srcpad,
1113 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
1114 gst_pad_set_getcaps_function (sel->srcpad,
1115 GST_DEBUG_FUNCPTR (gst_input_selector_getcaps));
1116 gst_pad_set_query_function (sel->srcpad,
1117 GST_DEBUG_FUNCPTR (gst_input_selector_query));
1118 gst_pad_set_event_function (sel->srcpad,
1119 GST_DEBUG_FUNCPTR (gst_input_selector_event));
1120 gst_element_add_pad (GST_ELEMENT (sel), sel->srcpad);
1121 /* sinkpad management */
1122 sel->active_sinkpad = NULL;
1123 sel->padcount = 0;
1124 gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED);
1125 sel->sync_streams = DEFAULT_SYNC_STREAMS;
1127 sel->lock = g_mutex_new ();
1128 sel->cond = g_cond_new ();
1129 sel->blocked = FALSE;
1130 }
1132 static void
1133 gst_input_selector_dispose (GObject * object)
1134 {
1135 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
1137 if (sel->active_sinkpad) {
1138 gst_object_unref (sel->active_sinkpad);
1139 sel->active_sinkpad = NULL;
1140 }
1141 if (sel->lock) {
1142 g_mutex_free (sel->lock);
1143 sel->lock = NULL;
1144 }
1145 if (sel->cond) {
1146 g_cond_free (sel->cond);
1147 sel->cond = NULL;
1148 }
1150 G_OBJECT_CLASS (parent_class)->dispose (object);
1151 }
1153 /* Solve the following equation for B.timestamp, and set that as the segment
1154 * stop:
1155 * B.running_time = (B.timestamp - NS.start) / NS.abs_rate + NS.accum
1156 */
1157 static gint64
1158 gst_segment_get_timestamp (GstSegment * segment, gint64 running_time)
1159 {
1160 if (running_time <= segment->accum)
1161 return segment->start;
1162 else
1163 return (running_time - segment->accum) * segment->abs_rate + segment->start;
1164 }
1166 static void
1167 gst_segment_set_stop (GstSegment * segment, gint64 running_time)
1168 {
1169 segment->stop = gst_segment_get_timestamp (segment, running_time);
1170 segment->last_stop = -1;
1171 }
1173 static void
1174 gst_segment_set_start (GstSegment * segment, gint64 running_time)
1175 {
1176 gint64 new_start, duration;
1178 new_start = gst_segment_get_timestamp (segment, running_time);
1180 /* this is the duration we skipped */
1181 duration = new_start - segment->start;
1182 /* add the duration to the accumulated segment time */
1183 segment->accum += duration;
1184 /* move position in the segment */
1185 segment->time += duration;
1186 segment->start += duration;
1187 }
1189 /* this function must be called with the SELECTOR_LOCK. It returns TRUE when the
1190 * active pad changed. */
1191 static gboolean
1192 gst_input_selector_set_active_pad (GstInputSelector * self,
1193 GstPad * pad, gint64 stop_time, gint64 start_time)
1194 {
1195 GstSelectorPad *old, *new;
1196 GstPad **active_pad_p;
1198 if (pad == self->active_sinkpad)
1199 return FALSE;
1201 old = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
1202 new = GST_SELECTOR_PAD_CAST (pad);
1204 GST_DEBUG_OBJECT (self, "setting active pad to %s:%s",
1205 GST_DEBUG_PAD_NAME (new));
1207 if (!GST_CLOCK_TIME_IS_VALID (stop_time) && old) {
1208 /* no stop time given, get the latest running_time on the active pad to
1209 * close and open the new segment */
1210 stop_time = start_time = gst_selector_pad_get_running_time (old);
1211 GST_DEBUG_OBJECT (self, "using start/stop of %" GST_TIME_FORMAT,
1212 GST_TIME_ARGS (start_time));
1213 }
1215 if (old && old->active && !self->pending_close && stop_time >= 0) {
1216 /* schedule a last_stop update if one isn't already scheduled, and a
1217 segment has been pushed before. */
1218 memcpy (&self->segment, &old->segment, sizeof (self->segment));
1220 GST_DEBUG_OBJECT (self, "setting stop_time to %" GST_TIME_FORMAT,
1221 GST_TIME_ARGS (stop_time));
1222 gst_segment_set_stop (&self->segment, stop_time);
1223 self->pending_close = TRUE;
1224 }
1225 if (old)
1226 old->pushed = FALSE;
1228 if (new && new->active && start_time >= 0) {
1229 GST_DEBUG_OBJECT (self, "setting start_time to %" GST_TIME_FORMAT,
1230 GST_TIME_ARGS (start_time));
1231 /* schedule a new segment push */
1232 gst_segment_set_start (&new->segment, start_time);
1233 new->segment_pending = TRUE;
1234 }
1235 if (new)
1236 new->pushed = FALSE;
1238 active_pad_p = &self->active_sinkpad;
1239 gst_object_replace ((GstObject **) active_pad_p, GST_OBJECT_CAST (pad));
1241 /* Wake up all non-active pads in sync mode, they might be
1242 * the active pad now */
1243 if (self->sync_streams)
1244 GST_INPUT_SELECTOR_BROADCAST (self);
1246 GST_DEBUG_OBJECT (self, "New active pad is %" GST_PTR_FORMAT,
1247 self->active_sinkpad);
1249 return TRUE;
1250 }
1252 static void
1253 gst_input_selector_set_property (GObject * object, guint prop_id,
1254 const GValue * value, GParamSpec * pspec)
1255 {
1256 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
1258 switch (prop_id) {
1259 case PROP_ACTIVE_PAD:
1260 {
1261 GstPad *pad;
1263 pad = g_value_get_object (value);
1265 GST_INPUT_SELECTOR_LOCK (sel);
1266 gst_input_selector_set_active_pad (sel, pad,
1267 GST_CLOCK_TIME_NONE, GST_CLOCK_TIME_NONE);
1268 GST_INPUT_SELECTOR_UNLOCK (sel);
1269 break;
1270 }
1271 case PROP_SYNC_STREAMS:
1272 {
1273 GST_INPUT_SELECTOR_LOCK (sel);
1274 sel->sync_streams = g_value_get_boolean (value);
1275 GST_INPUT_SELECTOR_UNLOCK (sel);
1276 break;
1277 }
1278 default:
1279 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1280 break;
1281 }
1282 }
1284 static void
1285 gst_input_selector_get_property (GObject * object, guint prop_id,
1286 GValue * value, GParamSpec * pspec)
1287 {
1288 GstInputSelector *sel = GST_INPUT_SELECTOR (object);
1290 switch (prop_id) {
1291 case PROP_N_PADS:
1292 GST_INPUT_SELECTOR_LOCK (object);
1293 g_value_set_uint (value, sel->n_pads);
1294 GST_INPUT_SELECTOR_UNLOCK (object);
1295 break;
1296 case PROP_ACTIVE_PAD:
1297 GST_INPUT_SELECTOR_LOCK (object);
1298 g_value_set_object (value, sel->active_sinkpad);
1299 GST_INPUT_SELECTOR_UNLOCK (object);
1300 break;
1301 case PROP_SYNC_STREAMS:
1302 GST_INPUT_SELECTOR_LOCK (object);
1303 g_value_set_boolean (value, sel->sync_streams);
1304 GST_INPUT_SELECTOR_UNLOCK (object);
1305 break;
1306 default:
1307 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1308 break;
1309 }
1310 }
1312 static GstPad *
1313 gst_input_selector_get_linked_pad (GstInputSelector * sel, GstPad * pad,
1314 gboolean strict)
1315 {
1316 GstPad *otherpad = NULL;
1318 GST_INPUT_SELECTOR_LOCK (sel);
1319 if (pad == sel->srcpad)
1320 otherpad = sel->active_sinkpad;
1321 else if (pad == sel->active_sinkpad || !strict)
1322 otherpad = sel->srcpad;
1323 if (otherpad)
1324 gst_object_ref (otherpad);
1325 GST_INPUT_SELECTOR_UNLOCK (sel);
1327 return otherpad;
1328 }
1330 static gboolean
1331 gst_input_selector_event (GstPad * pad, GstEvent * event)
1332 {
1333 GstInputSelector *sel;
1334 gboolean res = FALSE;
1335 GstPad *otherpad;
1337 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
1338 if (G_UNLIKELY (sel == NULL)) {
1339 gst_event_unref (event);
1340 return FALSE;
1341 }
1343 otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE);
1344 if (otherpad) {
1345 res = gst_pad_push_event (otherpad, event);
1347 gst_object_unref (otherpad);
1348 } else
1349 gst_event_unref (event);
1351 gst_object_unref (sel);
1352 return res;
1353 }
1355 /* query on the srcpad. We override this function because by default it will
1356 * only forward the query to one random sinkpad */
1357 static gboolean
1358 gst_input_selector_query (GstPad * pad, GstQuery * query)
1359 {
1360 gboolean res = TRUE;
1361 GstInputSelector *sel;
1362 GstPad *otherpad;
1364 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
1365 if (G_UNLIKELY (sel == NULL))
1366 return FALSE;
1368 otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE);
1370 switch (GST_QUERY_TYPE (query)) {
1371 case GST_QUERY_LATENCY:
1372 {
1373 GList *walk;
1374 GstClockTime resmin, resmax;
1375 gboolean reslive;
1377 resmin = 0;
1378 resmax = -1;
1379 reslive = FALSE;
1381 /* assume FALSE, we become TRUE if one query succeeds */
1382 res = FALSE;
1384 /* perform the query on all sinkpads and combine the results. We take the
1385 * max of min and the min of max for the result latency. */
1386 GST_INPUT_SELECTOR_LOCK (sel);
1387 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk;
1388 walk = g_list_next (walk)) {
1389 GstPad *sinkpad = GST_PAD_CAST (walk->data);
1391 if (gst_pad_peer_query (sinkpad, query)) {
1392 GstClockTime min, max;
1393 gboolean live;
1395 /* one query succeeded, we succeed too */
1396 res = TRUE;
1398 gst_query_parse_latency (query, &live, &min, &max);
1400 GST_DEBUG_OBJECT (sinkpad,
1401 "peer latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1402 ", live %d", GST_TIME_ARGS (min), GST_TIME_ARGS (max), live);
1404 if (live) {
1405 if (min > resmin)
1406 resmin = min;
1407 if (resmax == -1)
1408 resmax = max;
1409 else if (max < resmax)
1410 resmax = max;
1411 if (reslive == FALSE)
1412 reslive = live;
1413 }
1414 }
1415 }
1416 GST_INPUT_SELECTOR_UNLOCK (sel);
1417 if (res) {
1418 gst_query_set_latency (query, reslive, resmin, resmax);
1420 GST_DEBUG_OBJECT (sel,
1421 "total latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1422 ", live %d", GST_TIME_ARGS (resmin), GST_TIME_ARGS (resmax),
1423 reslive);
1424 }
1426 break;
1427 }
1428 default:
1429 if (otherpad)
1430 res = gst_pad_peer_query (otherpad, query);
1431 break;
1432 }
1433 if (otherpad)
1434 gst_object_unref (otherpad);
1435 gst_object_unref (sel);
1437 return res;
1438 }
1440 static GstCaps *
1441 gst_input_selector_getcaps (GstPad * pad)
1442 {
1443 GstPad *otherpad;
1444 GstInputSelector *sel;
1445 GstCaps *caps;
1447 sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
1448 if (G_UNLIKELY (sel == NULL))
1449 return gst_caps_new_any ();
1451 otherpad = gst_input_selector_get_linked_pad (sel, pad, FALSE);
1453 if (!otherpad) {
1454 GST_DEBUG_OBJECT (pad, "Pad not linked, returning ANY");
1455 caps = gst_caps_new_any ();
1456 } else {
1457 GST_DEBUG_OBJECT (pad, "Pad is linked (to %s:%s), returning peer caps",
1458 GST_DEBUG_PAD_NAME (otherpad));
1459 /* if the peer has caps, use those. If the pad is not linked, this function
1460 * returns NULL and we return ANY */
1461 if (!(caps = gst_pad_peer_get_caps_reffed (otherpad)))
1462 caps = gst_caps_new_any ();
1463 gst_object_unref (otherpad);
1464 }
1466 gst_object_unref (sel);
1467 return caps;
1468 }
1470 /* check if the pad is the active sinkpad */
1471 static inline gboolean
1472 gst_input_selector_is_active_sinkpad (GstInputSelector * sel, GstPad * pad)
1473 {
1474 gboolean res;
1476 GST_INPUT_SELECTOR_LOCK (sel);
1477 res = (pad == sel->active_sinkpad);
1478 GST_INPUT_SELECTOR_UNLOCK (sel);
1480 return res;
1481 }
1483 /* Get or create the active sinkpad, must be called with SELECTOR_LOCK */
1484 static GstPad *
1485 gst_input_selector_activate_sinkpad (GstInputSelector * sel, GstPad * pad)
1486 {
1487 GstPad *active_sinkpad;
1488 GstSelectorPad *selpad;
1490 selpad = GST_SELECTOR_PAD_CAST (pad);
1492 selpad->active = TRUE;
1493 active_sinkpad = sel->active_sinkpad;
1494 if (active_sinkpad == NULL) {
1495 /* first pad we get activity on becomes the activated pad by default */
1496 if (sel->active_sinkpad)
1497 gst_object_unref (sel->active_sinkpad);
1498 active_sinkpad = sel->active_sinkpad = gst_object_ref (pad);
1499 GST_DEBUG_OBJECT (sel, "Activating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1500 }
1502 return active_sinkpad;
1503 }
1505 static GstPad *
1506 gst_input_selector_request_new_pad (GstElement * element,
1507 GstPadTemplate * templ, const gchar * unused)
1508 {
1509 GstInputSelector *sel;
1510 gchar *name = NULL;
1511 GstPad *sinkpad = NULL;
1513 g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL);
1515 sel = GST_INPUT_SELECTOR (element);
1517 GST_INPUT_SELECTOR_LOCK (sel);
1519 GST_LOG_OBJECT (sel, "Creating new pad %d", sel->padcount);
1520 name = g_strdup_printf ("sink%d", sel->padcount++);
1521 sinkpad = g_object_new (GST_TYPE_SELECTOR_PAD,
1522 "name", name, "direction", templ->direction, "template", templ, NULL);
1523 g_free (name);
1525 sel->n_pads++;
1527 gst_pad_set_event_function (sinkpad,
1528 GST_DEBUG_FUNCPTR (gst_selector_pad_event));
1529 gst_pad_set_getcaps_function (sinkpad,
1530 GST_DEBUG_FUNCPTR (gst_selector_pad_getcaps));
1531 gst_pad_set_acceptcaps_function (sinkpad,
1532 GST_DEBUG_FUNCPTR (gst_selector_pad_acceptcaps));
1533 gst_pad_set_chain_function (sinkpad,
1534 GST_DEBUG_FUNCPTR (gst_selector_pad_chain));
1535 gst_pad_set_iterate_internal_links_function (sinkpad,
1536 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
1537 gst_pad_set_bufferalloc_function (sinkpad,
1538 GST_DEBUG_FUNCPTR (gst_selector_pad_bufferalloc));
1540 gst_pad_set_active (sinkpad, TRUE);
1541 gst_element_add_pad (GST_ELEMENT (sel), sinkpad);
1542 GST_INPUT_SELECTOR_UNLOCK (sel);
1544 return sinkpad;
1545 }
1547 static void
1548 gst_input_selector_release_pad (GstElement * element, GstPad * pad)
1549 {
1550 GstInputSelector *sel;
1552 sel = GST_INPUT_SELECTOR (element);
1553 GST_LOG_OBJECT (sel, "Releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1555 GST_INPUT_SELECTOR_LOCK (sel);
1556 /* if the pad was the active pad, makes us select a new one */
1557 if (sel->active_sinkpad == pad) {
1558 GST_DEBUG_OBJECT (sel, "Deactivating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1559 gst_object_unref (sel->active_sinkpad);
1560 sel->active_sinkpad = NULL;
1561 }
1562 sel->n_pads--;
1564 gst_pad_set_active (pad, FALSE);
1565 gst_element_remove_pad (GST_ELEMENT (sel), pad);
1566 GST_INPUT_SELECTOR_UNLOCK (sel);
1567 }
1569 static void
1570 gst_input_selector_reset (GstInputSelector * sel)
1571 {
1572 GList *walk;
1574 GST_INPUT_SELECTOR_LOCK (sel);
1575 /* clear active pad */
1576 if (sel->active_sinkpad) {
1577 gst_object_unref (sel->active_sinkpad);
1578 sel->active_sinkpad = NULL;
1579 }
1580 /* reset segment */
1581 gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED);
1582 sel->pending_close = FALSE;
1583 /* reset each of our sinkpads state */
1584 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
1585 GstSelectorPad *selpad = GST_SELECTOR_PAD_CAST (walk->data);
1587 gst_selector_pad_reset (selpad);
1589 if (selpad->tags) {
1590 gst_tag_list_free (selpad->tags);
1591 selpad->tags = NULL;
1592 }
1593 }
1594 GST_INPUT_SELECTOR_UNLOCK (sel);
1595 }
1597 static GstStateChangeReturn
1598 gst_input_selector_change_state (GstElement * element,
1599 GstStateChange transition)
1600 {
1601 GstInputSelector *self = GST_INPUT_SELECTOR (element);
1602 GstStateChangeReturn result;
1604 switch (transition) {
1605 case GST_STATE_CHANGE_READY_TO_PAUSED:
1606 GST_INPUT_SELECTOR_LOCK (self);
1607 self->blocked = FALSE;
1608 self->flushing = FALSE;
1609 GST_INPUT_SELECTOR_UNLOCK (self);
1610 break;
1611 case GST_STATE_CHANGE_PAUSED_TO_READY:
1612 /* first unlock before we call the parent state change function, which
1613 * tries to acquire the stream lock when going to ready. */
1614 GST_INPUT_SELECTOR_LOCK (self);
1615 self->blocked = FALSE;
1616 self->flushing = TRUE;
1617 GST_INPUT_SELECTOR_BROADCAST (self);
1618 GST_INPUT_SELECTOR_UNLOCK (self);
1619 break;
1620 default:
1621 break;
1622 }
1624 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1626 switch (transition) {
1627 case GST_STATE_CHANGE_PAUSED_TO_READY:
1628 gst_input_selector_reset (self);
1629 break;
1630 default:
1631 break;
1632 }
1634 return result;
1635 }
1637 static gint64
1638 gst_input_selector_block (GstInputSelector * self)
1639 {
1640 gint64 ret = 0;
1641 GstSelectorPad *spad;
1643 GST_INPUT_SELECTOR_LOCK (self);
1645 if (self->blocked)
1646 GST_WARNING_OBJECT (self, "switch already blocked");
1648 self->blocked = TRUE;
1649 spad = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
1651 if (spad)
1652 ret = gst_selector_pad_get_running_time (spad);
1653 else
1654 GST_DEBUG_OBJECT (self, "no active pad while blocking");
1656 GST_INPUT_SELECTOR_UNLOCK (self);
1658 return ret;
1659 }
1661 /* stop_time and start_time are running times */
1662 static void
1663 gst_input_selector_switch (GstInputSelector * self, GstPad * pad,
1664 gint64 stop_time, gint64 start_time)
1665 {
1666 gboolean changed;
1668 g_return_if_fail (self->blocked == TRUE);
1670 GST_INPUT_SELECTOR_LOCK (self);
1671 changed =
1672 gst_input_selector_set_active_pad (self, pad, stop_time, start_time);
1674 self->blocked = FALSE;
1675 GST_INPUT_SELECTOR_BROADCAST (self);
1676 GST_INPUT_SELECTOR_UNLOCK (self);
1678 if (changed) {
1679 NOTIFY_MUTEX_LOCK ();
1680 g_object_notify (G_OBJECT (self), "active-pad");
1681 NOTIFY_MUTEX_UNLOCK ();
1682 }
1683 }