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., 51 Franklin St, Fifth Floor,
23 * Boston, MA 02110-1301, USA.
24 */
25
26 /**
27 * SECTION:element-input-selector
28 * @title: input-selector
29 * @see_also: #GstOutputSelector
30 *
31 * Direct one out of N input streams to the output pad.
32 *
33 * The input pads are from a GstPad subclass and have additional
34 * properties, which users may find useful, namely:
35 *
36 * * "running-time": Running time of stream on pad (#gint64)
37 * * "tags": The currently active tags on the pad (#GstTagList, boxed type)
38 * * "active": If the pad is currently active (#gboolean)
39 * * "always-ok" : Make an inactive pads return #GST_FLOW_OK instead of #GST_FLOW_NOT_LINKED
40 *
41 */
42
43 #ifdef HAVE_CONFIG_H
44 #include "config.h"
45 #endif
46
47 #include <string.h>
48
49 #include "rsninputselector.h"
50
51 #define DEBUG_CACHED_BUFFERS 0
52
53 GST_DEBUG_CATEGORY_STATIC (input_selector_debug);
54 #define GST_CAT_DEFAULT input_selector_debug
55
56 #define GST_TYPE_INPUT_SELECTOR_SYNC_MODE (gst_input_selector_sync_mode_get_type())
57 static GType
gst_input_selector_sync_mode_get_type(void)58 gst_input_selector_sync_mode_get_type (void)
59 {
60 static GType type = 0;
61 static const GEnumValue data[] = {
62 {GST_INPUT_SELECTOR_SYNC_MODE_ACTIVE_SEGMENT,
63 "Sync using the current active segment",
64 "active-segment"},
65 {GST_INPUT_SELECTOR_SYNC_MODE_CLOCK, "Sync using the clock", "clock"},
66 {0, NULL, NULL},
67 };
68
69 if (!type) {
70 type = g_enum_register_static ("RsnInputSelectorSyncMode", data);
71 }
72 return type;
73 }
74
75 #define GST_INPUT_SELECTOR_GET_LOCK(sel) (&((RsnInputSelector*)(sel))->lock)
76 #define GST_INPUT_SELECTOR_GET_COND(sel) (&((RsnInputSelector*)(sel))->cond)
77 #define GST_INPUT_SELECTOR_LOCK(sel) (g_mutex_lock (GST_INPUT_SELECTOR_GET_LOCK(sel)))
78 #define GST_INPUT_SELECTOR_UNLOCK(sel) (g_mutex_unlock (GST_INPUT_SELECTOR_GET_LOCK(sel)))
79 #define GST_INPUT_SELECTOR_WAIT(sel) (g_cond_wait (GST_INPUT_SELECTOR_GET_COND(sel), \
80 GST_INPUT_SELECTOR_GET_LOCK(sel)))
81 #define GST_INPUT_SELECTOR_BROADCAST(sel) (g_cond_broadcast (GST_INPUT_SELECTOR_GET_COND(sel)))
82
83 static GstStaticPadTemplate gst_input_selector_sink_factory =
84 GST_STATIC_PAD_TEMPLATE ("sink_%u",
85 GST_PAD_SINK,
86 GST_PAD_REQUEST,
87 GST_STATIC_CAPS_ANY);
88
89 static GstStaticPadTemplate gst_input_selector_src_factory =
90 GST_STATIC_PAD_TEMPLATE ("src",
91 GST_PAD_SRC,
92 GST_PAD_ALWAYS,
93 GST_STATIC_CAPS_ANY);
94
95 enum
96 {
97 PROP_0,
98 PROP_N_PADS,
99 PROP_ACTIVE_PAD,
100 PROP_SYNC_STREAMS,
101 PROP_SYNC_MODE,
102 PROP_CACHE_BUFFERS
103 };
104
105 #define DEFAULT_SYNC_STREAMS TRUE
106 #define DEFAULT_SYNC_MODE GST_INPUT_SELECTOR_SYNC_MODE_ACTIVE_SEGMENT
107 #define DEFAULT_CACHE_BUFFERS FALSE
108 #define DEFAULT_PAD_ALWAYS_OK TRUE
109
110 enum
111 {
112 PROP_PAD_0,
113 PROP_PAD_RUNNING_TIME,
114 PROP_PAD_TAGS,
115 PROP_PAD_ACTIVE,
116 PROP_PAD_ALWAYS_OK
117 };
118
119 enum
120 {
121 /* methods */
122 SIGNAL_BLOCK,
123 SIGNAL_SWITCH,
124 LAST_SIGNAL
125 };
126 static guint gst_input_selector_signals[LAST_SIGNAL] = { 0 };
127
128 static void gst_input_selector_active_pad_changed (RsnInputSelector * sel,
129 GParamSpec * pspec, gpointer user_data);
130 static inline gboolean gst_input_selector_is_active_sinkpad (RsnInputSelector *
131 sel, GstPad * pad);
132 static GstPad *gst_input_selector_activate_sinkpad (RsnInputSelector * sel,
133 GstPad * pad);
134 static gboolean gst_input_selector_set_active_pad (RsnInputSelector * self,
135 GstPad * pad);
136 static GstPad *gst_input_selector_get_linked_pad (RsnInputSelector * sel,
137 GstPad * pad, gboolean strict);
138 static gboolean forward_sticky_events (GstPad * sinkpad, GstEvent ** event,
139 gpointer user_data);
140
141 #define GST_TYPE_SELECTOR_PAD \
142 (gst_selector_pad_get_type())
143 #define GST_SELECTOR_PAD(obj) \
144 (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_SELECTOR_PAD, RsnSelectorPad))
145 #define GST_SELECTOR_PAD_CLASS(klass) \
146 (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_SELECTOR_PAD, RsnSelectorPadClass))
147 #define GST_IS_SELECTOR_PAD(obj) \
148 (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_SELECTOR_PAD))
149 #define GST_IS_SELECTOR_PAD_CLASS(klass) \
150 (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_SELECTOR_PAD))
151 #define GST_SELECTOR_PAD_CAST(obj) \
152 ((RsnSelectorPad *)(obj))
153
154 typedef struct _RsnSelectorPad RsnSelectorPad;
155 typedef struct _RsnSelectorPadClass RsnSelectorPadClass;
156 typedef struct _RsnSelectorPadCachedBuffer RsnSelectorPadCachedBuffer;
157
158 struct _RsnSelectorPad
159 {
160 GstPad parent;
161
162 gboolean active; /* when buffer have passed the pad */
163 gboolean pushed; /* when buffer was pushed downstream since activation */
164 gboolean eos; /* when EOS has been received */
165 gboolean eos_sent; /* when EOS was sent downstream */
166 gboolean discont; /* after switching we create a discont */
167 gboolean flushing; /* set after flush-start and before flush-stop */
168 gboolean always_ok;
169 GstTagList *tags; /* last tags received on the pad */
170
171 GstClockTime position; /* the current position in the segment */
172 GstSegment segment; /* the current segment on the pad */
173 guint32 segment_seqnum; /* sequence number of the current segment */
174
175 gboolean events_pending; /* TRUE if sticky events need to be updated */
176
177 gboolean sending_cached_buffers;
178 GQueue *cached_buffers;
179 };
180
181 struct _RsnSelectorPadCachedBuffer
182 {
183 GstBuffer *buffer;
184 GstSegment segment;
185 };
186
187 struct _RsnSelectorPadClass
188 {
189 GstPadClass parent;
190 };
191
192 GType gst_selector_pad_get_type (void);
193 static void gst_selector_pad_finalize (GObject * object);
194 static void gst_selector_pad_get_property (GObject * object,
195 guint prop_id, GValue * value, GParamSpec * pspec);
196 static void gst_selector_pad_set_property (GObject * object,
197 guint prop_id, const GValue * value, GParamSpec * pspec);
198
199 static gint64 gst_selector_pad_get_running_time (RsnSelectorPad * pad);
200 static void gst_selector_pad_reset (RsnSelectorPad * pad);
201 static gboolean gst_selector_pad_event (GstPad * pad, GstObject * parent,
202 GstEvent * event);
203 static gboolean gst_selector_pad_query (GstPad * pad, GstObject * parent,
204 GstQuery * query);
205 static GstIterator *gst_selector_pad_iterate_linked_pads (GstPad * pad,
206 GstObject * parent);
207 static GstFlowReturn gst_selector_pad_chain (GstPad * pad, GstObject * parent,
208 GstBuffer * buf);
209 static void gst_selector_pad_cache_buffer (RsnSelectorPad * selpad,
210 GstBuffer * buffer);
211 static void gst_selector_pad_free_cached_buffers (RsnSelectorPad * selpad);
212
213 G_DEFINE_TYPE (RsnSelectorPad, gst_selector_pad, GST_TYPE_PAD);
214
215 static void
gst_selector_pad_class_init(RsnSelectorPadClass * klass)216 gst_selector_pad_class_init (RsnSelectorPadClass * klass)
217 {
218 GObjectClass *gobject_class;
219
220 gobject_class = (GObjectClass *) klass;
221
222 gobject_class->finalize = gst_selector_pad_finalize;
223
224 gobject_class->get_property = gst_selector_pad_get_property;
225 gobject_class->set_property = gst_selector_pad_set_property;
226
227 g_object_class_install_property (gobject_class, PROP_PAD_RUNNING_TIME,
228 g_param_spec_int64 ("running-time", "Running time",
229 "Running time of stream on pad", 0, G_MAXINT64, 0,
230 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
231 g_object_class_install_property (gobject_class, PROP_PAD_TAGS,
232 g_param_spec_boxed ("tags", "Tags",
233 "The currently active tags on the pad", GST_TYPE_TAG_LIST,
234 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
235 g_object_class_install_property (gobject_class, PROP_PAD_ACTIVE,
236 g_param_spec_boolean ("active", "Active",
237 "If the pad is currently active", FALSE,
238 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
239 /* FIXME: better property name? */
240 g_object_class_install_property (gobject_class, PROP_PAD_ALWAYS_OK,
241 g_param_spec_boolean ("always-ok", "Always OK",
242 "Make an inactive pad return OK instead of NOT_LINKED",
243 DEFAULT_PAD_ALWAYS_OK, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
244 }
245
246 static void
gst_selector_pad_init(RsnSelectorPad * pad)247 gst_selector_pad_init (RsnSelectorPad * pad)
248 {
249 pad->always_ok = DEFAULT_PAD_ALWAYS_OK;
250 gst_selector_pad_reset (pad);
251 }
252
253 static void
gst_selector_pad_finalize(GObject * object)254 gst_selector_pad_finalize (GObject * object)
255 {
256 RsnSelectorPad *pad;
257
258 pad = GST_SELECTOR_PAD_CAST (object);
259
260 if (pad->tags)
261 gst_tag_list_unref (pad->tags);
262 gst_selector_pad_free_cached_buffers (pad);
263
264 G_OBJECT_CLASS (gst_selector_pad_parent_class)->finalize (object);
265 }
266
267 static void
gst_selector_pad_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)268 gst_selector_pad_set_property (GObject * object, guint prop_id,
269 const GValue * value, GParamSpec * pspec)
270 {
271 RsnSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
272
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 }
284
285 static void
gst_selector_pad_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)286 gst_selector_pad_get_property (GObject * object, guint prop_id,
287 GValue * value, GParamSpec * pspec)
288 {
289 RsnSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
290
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 RsnInputSelector *sel;
303
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 }
320
321 static gint64
gst_selector_pad_get_running_time(RsnSelectorPad * pad)322 gst_selector_pad_get_running_time (RsnSelectorPad * pad)
323 {
324 gint64 ret = 0;
325
326 GST_OBJECT_LOCK (pad);
327 if (pad->active) {
328 guint64 position = pad->position;
329 GstFormat format = pad->segment.format;
330
331 ret = gst_segment_to_running_time (&pad->segment, format, position);
332 }
333 GST_OBJECT_UNLOCK (pad);
334
335 GST_DEBUG_OBJECT (pad, "running time: %" GST_TIME_FORMAT
336 " segment: %" GST_SEGMENT_FORMAT, GST_TIME_ARGS (ret), &pad->segment);
337
338 return ret;
339 }
340
341 /* must be called with the SELECTOR_LOCK */
342 static void
gst_selector_pad_reset(RsnSelectorPad * pad)343 gst_selector_pad_reset (RsnSelectorPad * 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->events_pending = FALSE;
351 pad->discont = FALSE;
352 pad->flushing = FALSE;
353 pad->position = GST_CLOCK_TIME_NONE;
354 gst_segment_init (&pad->segment, GST_FORMAT_UNDEFINED);
355 pad->sending_cached_buffers = FALSE;
356 gst_selector_pad_free_cached_buffers (pad);
357 GST_OBJECT_UNLOCK (pad);
358 }
359
360 static RsnSelectorPadCachedBuffer *
gst_selector_pad_new_cached_buffer(RsnSelectorPad * selpad,GstBuffer * buffer)361 gst_selector_pad_new_cached_buffer (RsnSelectorPad * selpad, GstBuffer * buffer)
362 {
363 RsnSelectorPadCachedBuffer *cached_buffer =
364 g_slice_new (RsnSelectorPadCachedBuffer);
365 cached_buffer->buffer = buffer;
366 cached_buffer->segment = selpad->segment;
367 return cached_buffer;
368 }
369
370 static void
gst_selector_pad_free_cached_buffer(RsnSelectorPadCachedBuffer * cached_buffer)371 gst_selector_pad_free_cached_buffer (RsnSelectorPadCachedBuffer * cached_buffer)
372 {
373 gst_buffer_unref (cached_buffer->buffer);
374 g_slice_free (RsnSelectorPadCachedBuffer, cached_buffer);
375 }
376
377 /* must be called with the SELECTOR_LOCK */
378 static void
gst_selector_pad_cache_buffer(RsnSelectorPad * selpad,GstBuffer * buffer)379 gst_selector_pad_cache_buffer (RsnSelectorPad * selpad, GstBuffer * buffer)
380 {
381 if (selpad->segment.format != GST_FORMAT_TIME) {
382 GST_DEBUG_OBJECT (selpad, "Buffer %p with segment not in time format, "
383 "not caching", buffer);
384 return;
385 }
386
387 GST_DEBUG_OBJECT (selpad, "Caching buffer %p", buffer);
388 if (!selpad->cached_buffers)
389 selpad->cached_buffers = g_queue_new ();
390 g_queue_push_tail (selpad->cached_buffers,
391 gst_selector_pad_new_cached_buffer (selpad, buffer));
392 }
393
394 /* must be called with the SELECTOR_LOCK */
395 static void
gst_selector_pad_free_cached_buffers(RsnSelectorPad * selpad)396 gst_selector_pad_free_cached_buffers (RsnSelectorPad * selpad)
397 {
398 RsnSelectorPadCachedBuffer *cached_buffer;
399
400 if (!selpad->cached_buffers)
401 return;
402
403 GST_DEBUG_OBJECT (selpad, "Freeing cached buffers");
404 while ((cached_buffer = g_queue_pop_head (selpad->cached_buffers)))
405 gst_selector_pad_free_cached_buffer (cached_buffer);
406 g_queue_free (selpad->cached_buffers);
407 selpad->cached_buffers = NULL;
408 }
409
410 /* strictly get the linked pad from the sinkpad. If the pad is active we return
411 * the srcpad else we return NULL */
412 static GstIterator *
gst_selector_pad_iterate_linked_pads(GstPad * pad,GstObject * parent)413 gst_selector_pad_iterate_linked_pads (GstPad * pad, GstObject * parent)
414 {
415 RsnInputSelector *sel;
416 GstPad *otherpad;
417 GstIterator *it = NULL;
418 GValue val = { 0, };
419
420 sel = GST_INPUT_SELECTOR (parent);
421
422 otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE);
423 if (otherpad) {
424 g_value_init (&val, GST_TYPE_PAD);
425 g_value_set_object (&val, otherpad);
426 it = gst_iterator_new_single (GST_TYPE_PAD, &val);
427 g_value_unset (&val);
428 gst_object_unref (otherpad);
429 }
430
431 return it;
432 }
433
434 static gboolean
gst_selector_pad_event(GstPad * pad,GstObject * parent,GstEvent * event)435 gst_selector_pad_event (GstPad * pad, GstObject * parent, GstEvent * event)
436 {
437 gboolean res = TRUE;
438 gboolean forward;
439 gboolean new_tags = FALSE;
440 RsnInputSelector *sel;
441 RsnSelectorPad *selpad;
442 GstPad *prev_active_sinkpad;
443 GstPad *active_sinkpad;
444
445 sel = GST_INPUT_SELECTOR (parent);
446 selpad = GST_SELECTOR_PAD_CAST (pad);
447 GST_DEBUG_OBJECT (selpad, "received event %" GST_PTR_FORMAT, event);
448
449 GST_INPUT_SELECTOR_LOCK (sel);
450 prev_active_sinkpad = sel->active_sinkpad;
451 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
452 GST_INPUT_SELECTOR_UNLOCK (sel);
453
454 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) {
455 g_object_notify (G_OBJECT (sel), "active-pad");
456 }
457
458 GST_INPUT_SELECTOR_LOCK (sel);
459 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
460
461 /* only forward if we are dealing with the active sinkpad */
462 forward = (pad == active_sinkpad);
463
464 switch (GST_EVENT_TYPE (event)) {
465 case GST_EVENT_FLUSH_START:
466 /* Unblock the pad if it's waiting */
467 selpad->flushing = TRUE;
468 GST_INPUT_SELECTOR_BROADCAST (sel);
469 break;
470 case GST_EVENT_FLUSH_STOP:
471 gst_selector_pad_reset (selpad);
472 break;
473 case GST_EVENT_SEGMENT:
474 {
475 gst_event_copy_segment (event, &selpad->segment);
476 selpad->segment_seqnum = gst_event_get_seqnum (event);
477
478 /* Update the position */
479 if (selpad->position == GST_CLOCK_TIME_NONE
480 || selpad->segment.position > selpad->position) {
481 selpad->position = selpad->segment.position;
482 } else if (selpad->position != GST_CLOCK_TIME_NONE
483 && selpad->position > selpad->segment.position) {
484 selpad->segment.position = selpad->position;
485
486 if (forward) {
487 gst_event_unref (event);
488 event = gst_event_new_segment (&selpad->segment);
489 gst_event_set_seqnum (event, selpad->segment_seqnum);
490 }
491 }
492 GST_DEBUG_OBJECT (pad, "configured SEGMENT %" GST_SEGMENT_FORMAT,
493 &selpad->segment);
494 break;
495 }
496 case GST_EVENT_TAG:
497 {
498 GstTagList *tags, *oldtags, *newtags;
499
500 gst_event_parse_tag (event, &tags);
501
502 oldtags = selpad->tags;
503
504 newtags = gst_tag_list_merge (oldtags, tags, GST_TAG_MERGE_REPLACE);
505 selpad->tags = newtags;
506 if (oldtags)
507 gst_tag_list_unref (oldtags);
508 GST_DEBUG_OBJECT (pad, "received tags %" GST_PTR_FORMAT, newtags);
509
510 new_tags = TRUE;
511 break;
512 }
513 case GST_EVENT_EOS:
514 selpad->eos = TRUE;
515
516 if (forward) {
517 selpad->eos_sent = TRUE;
518 } else {
519 RsnSelectorPad *active_selpad;
520
521 /* If the active sinkpad is in EOS state but EOS
522 * was not sent downstream this means that the pad
523 * got EOS before it was set as active pad and that
524 * the previously active pad got EOS after it was
525 * active
526 */
527 active_selpad = GST_SELECTOR_PAD (active_sinkpad);
528 forward = (active_selpad->eos && !active_selpad->eos_sent);
529 active_selpad->eos_sent = TRUE;
530 }
531 GST_DEBUG_OBJECT (pad, "received EOS");
532 break;
533 case GST_EVENT_CUSTOM_DOWNSTREAM:
534 {
535 const GstStructure *structure = gst_event_get_structure (event);
536 if (structure != NULL &&
537 gst_structure_has_name (structure, "application/x-gst-dvd")) {
538 const char *type = gst_structure_get_string (structure, "event");
539 if (strcmp (type, "select-pad") == 0) {
540 gst_input_selector_set_active_pad (sel, pad);
541 forward = FALSE;
542 }
543 }
544 }
545 break;
546
547 default:
548 break;
549 }
550 GST_INPUT_SELECTOR_UNLOCK (sel);
551 if (new_tags)
552 g_object_notify (G_OBJECT (selpad), "tags");
553 if (forward) {
554 GST_DEBUG_OBJECT (pad, "forwarding event");
555 res = gst_pad_push_event (sel->srcpad, event);
556 } else {
557 /* If we aren't forwarding the event because the pad is not the
558 * active_sinkpad, then set the flag on the pad
559 * that says a segment needs sending if/when that pad is activated.
560 * For all other cases, we send the event immediately, which makes
561 * sparse streams and other segment updates work correctly downstream.
562 */
563 if (GST_EVENT_IS_STICKY (event))
564 selpad->events_pending = TRUE;
565 gst_event_unref (event);
566 }
567
568 return res;
569 }
570
571 static gboolean
gst_selector_pad_query(GstPad * pad,GstObject * parent,GstQuery * query)572 gst_selector_pad_query (GstPad * pad, GstObject * parent, GstQuery * query)
573 {
574 gboolean res = FALSE;
575
576 switch (GST_QUERY_TYPE (query)) {
577 case GST_QUERY_ALLOCATION:{
578 GstPad *active_sinkpad;
579 RsnInputSelector *sel = GST_INPUT_SELECTOR (parent);
580
581 /* Only do the allocation query for the active sinkpad,
582 * after switching a reconfigure event is sent and upstream
583 * should reconfigure and do a new allocation query
584 */
585 if (GST_PAD_DIRECTION (pad) == GST_PAD_SINK) {
586 GST_INPUT_SELECTOR_LOCK (sel);
587 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
588 GST_INPUT_SELECTOR_UNLOCK (sel);
589
590 if (pad != active_sinkpad) {
591 res = FALSE;
592 goto done;
593 }
594 }
595 }
596 /* fall through */
597 default:
598 res = gst_pad_query_default (pad, parent, query);
599 break;
600 }
601
602 done:
603 return res;
604 }
605
606 /* must be called with the SELECTOR_LOCK, will block while the pad is blocked
607 * or return TRUE when flushing */
608 static gboolean
gst_input_selector_wait(RsnInputSelector * self,RsnSelectorPad * pad)609 gst_input_selector_wait (RsnInputSelector * self, RsnSelectorPad * pad)
610 {
611 while (self->blocked && !self->flushing && !pad->flushing) {
612 /* we can be unlocked here when we are shutting down (flushing) or when we
613 * get unblocked */
614 GST_INPUT_SELECTOR_WAIT (self);
615 }
616 return self->flushing;
617 }
618
619 /* must be called without the SELECTOR_LOCK, will wait until the running time
620 * of the active pad is after this pad or return TRUE when flushing */
621 static gboolean
gst_input_selector_wait_running_time(RsnInputSelector * sel,RsnSelectorPad * selpad,GstBuffer * buf)622 gst_input_selector_wait_running_time (RsnInputSelector * sel,
623 RsnSelectorPad * selpad, GstBuffer * buf)
624 {
625 GstSegment *seg;
626
627 GST_DEBUG_OBJECT (selpad, "entering wait for buffer %p", buf);
628
629 /* If we have no valid timestamp we can't sync this buffer */
630 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
631 GST_DEBUG_OBJECT (selpad, "leaving wait for buffer with "
632 "invalid timestamp");
633 return FALSE;
634 }
635
636 seg = &selpad->segment;
637
638 /* Wait until
639 * a) this is the active pad
640 * b) the pad or the selector is flushing
641 * c) the selector is not blocked
642 * d) the buffer running time is before the current running time
643 * (either active-seg or clock, depending on sync-mode)
644 */
645
646 GST_INPUT_SELECTOR_LOCK (sel);
647 while (TRUE) {
648 GstPad *active_sinkpad;
649 RsnSelectorPad *active_selpad;
650 GstClock *clock;
651 gint64 cur_running_time;
652 GstClockTime running_time;
653
654 active_sinkpad =
655 gst_input_selector_activate_sinkpad (sel, GST_PAD_CAST (selpad));
656 active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad);
657
658 if (seg->format != GST_FORMAT_TIME) {
659 GST_DEBUG_OBJECT (selpad,
660 "Not waiting because we don't have a TIME segment");
661 GST_INPUT_SELECTOR_UNLOCK (sel);
662 return FALSE;
663 }
664
665 running_time = GST_BUFFER_TIMESTAMP (buf);
666 /* If possible try to get the running time at the end of the buffer */
667 if (GST_BUFFER_DURATION_IS_VALID (buf))
668 running_time += GST_BUFFER_DURATION (buf);
669 /* Only use the segment to convert to running time if the segment is
670 * in TIME format, otherwise do our best to try to sync */
671 if (GST_CLOCK_TIME_IS_VALID (seg->stop)) {
672 if (running_time > seg->stop) {
673 running_time = seg->stop;
674 }
675 }
676 running_time =
677 gst_segment_to_running_time (seg, GST_FORMAT_TIME, running_time);
678 /* If this is outside the segment don't sync */
679 if (running_time == -1) {
680 GST_DEBUG_OBJECT (selpad,
681 "Not waiting because buffer is outside segment");
682 GST_INPUT_SELECTOR_UNLOCK (sel);
683 return FALSE;
684 }
685
686 cur_running_time = GST_CLOCK_TIME_NONE;
687 if (sel->sync_mode == GST_INPUT_SELECTOR_SYNC_MODE_CLOCK) {
688 clock = gst_element_get_clock (GST_ELEMENT_CAST (sel));
689 if (clock) {
690 GstClockTime base_time;
691
692 cur_running_time = gst_clock_get_time (clock);
693 base_time = gst_element_get_base_time (GST_ELEMENT_CAST (sel));
694 if (base_time <= cur_running_time)
695 cur_running_time -= base_time;
696 else
697 cur_running_time = 0;
698 gst_object_unref (clock);
699 }
700 } else {
701 GstSegment *active_seg;
702
703 active_seg = &active_selpad->segment;
704
705 /* If the active segment is configured but not to time format
706 * we can't do any syncing at all */
707 if (active_seg->format != GST_FORMAT_TIME
708 && active_seg->format != GST_FORMAT_UNDEFINED) {
709 GST_DEBUG_OBJECT (selpad,
710 "Not waiting because active segment isn't in TIME format");
711 GST_INPUT_SELECTOR_UNLOCK (sel);
712 return FALSE;
713 }
714
715 /* Get active pad's running time, if no configured segment yet keep at -1 */
716 if (active_seg->format == GST_FORMAT_TIME)
717 cur_running_time = gst_segment_to_running_time (active_seg,
718 GST_FORMAT_TIME, active_seg->position);
719 }
720
721 if (selpad != active_selpad && !sel->flushing && !selpad->flushing &&
722 (sel->blocked || cur_running_time == -1
723 || running_time >= cur_running_time)) {
724 if (!sel->blocked) {
725 GST_DEBUG_OBJECT (selpad,
726 "Waiting for active streams to advance. %" GST_TIME_FORMAT " >= %"
727 GST_TIME_FORMAT, GST_TIME_ARGS (running_time),
728 GST_TIME_ARGS (cur_running_time));
729 } else
730 GST_DEBUG_OBJECT (selpad, "Waiting for selector to unblock");
731
732 GST_INPUT_SELECTOR_WAIT (sel);
733 } else {
734 GST_INPUT_SELECTOR_UNLOCK (sel);
735 break;
736 }
737 }
738
739 /* Return TRUE if the selector or the pad is flushing */
740 return (sel->flushing || selpad->flushing);
741 }
742
743 static gboolean
forward_sticky_events(GstPad * sinkpad,GstEvent ** event,gpointer user_data)744 forward_sticky_events (GstPad * sinkpad, GstEvent ** event, gpointer user_data)
745 {
746 RsnInputSelector *sel = GST_INPUT_SELECTOR (user_data);
747
748 if (GST_EVENT_TYPE (*event) == GST_EVENT_SEGMENT) {
749 GstSegment *seg = &GST_SELECTOR_PAD (sinkpad)->segment;
750 GstEvent *e;
751
752 e = gst_event_new_segment (seg);
753 gst_event_set_seqnum (e, GST_SELECTOR_PAD_CAST (sinkpad)->segment_seqnum);
754
755 gst_pad_push_event (sel->srcpad, e);
756 } else if (GST_EVENT_TYPE (*event) != GST_EVENT_STREAM_START) {
757 GST_WARNING ("Pushing event %" GST_PTR_FORMAT, *event);
758 gst_pad_push_event (sel->srcpad, gst_event_ref (*event));
759 }
760
761 return TRUE;
762 }
763
764 #if DEBUG_CACHED_BUFFERS
765 static void
gst_input_selector_debug_cached_buffers(RsnInputSelector * sel)766 gst_input_selector_debug_cached_buffers (RsnInputSelector * sel)
767 {
768 GList *walk;
769
770 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
771 RsnSelectorPad *selpad;
772 GString *timestamps;
773 gchar *str;
774 int i;
775
776 selpad = GST_SELECTOR_PAD_CAST (walk->data);
777 if (!selpad->cached_buffers) {
778 GST_DEBUG_OBJECT (selpad, "Cached buffers timestamps: <none>");
779 continue;
780 }
781
782 timestamps = g_string_new ("Cached buffers timestamps:");
783 for (i = 0; i < selpad->cached_buffers->length; ++i) {
784 RsnSelectorPadCachedBuffer *cached_buffer;
785
786 cached_buffer = g_queue_peek_nth (selpad->cached_buffers, i);
787 g_string_append_printf (timestamps, " %" GST_TIME_FORMAT,
788 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (cached_buffer->buffer)));
789 }
790 str = g_string_free (timestamps, FALSE);
791 GST_DEBUG_OBJECT (selpad, str);
792 g_free (str);
793 }
794 }
795 #endif
796
797 /* must be called with the SELECTOR_LOCK */
798 static void
gst_input_selector_cleanup_old_cached_buffers(RsnInputSelector * sel,GstPad * pad)799 gst_input_selector_cleanup_old_cached_buffers (RsnInputSelector * sel,
800 GstPad * pad)
801 {
802 GstClock *clock;
803 gint64 cur_running_time;
804 GList *walk;
805
806 cur_running_time = GST_CLOCK_TIME_NONE;
807 if (sel->sync_mode == GST_INPUT_SELECTOR_SYNC_MODE_CLOCK) {
808 clock = gst_element_get_clock (GST_ELEMENT_CAST (sel));
809 if (clock) {
810 GstClockTime base_time;
811
812 cur_running_time = gst_clock_get_time (clock);
813 base_time = gst_element_get_base_time (GST_ELEMENT_CAST (sel));
814 if (base_time <= cur_running_time)
815 cur_running_time -= base_time;
816 else
817 cur_running_time = 0;
818 gst_object_unref (clock);
819 }
820 } else {
821 GstPad *active_sinkpad;
822 RsnSelectorPad *active_selpad;
823 GstSegment *active_seg;
824
825 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
826 active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad);
827 active_seg = &active_selpad->segment;
828
829 /* Get active pad's running time, if no configured segment yet keep at -1 */
830 if (active_seg->format == GST_FORMAT_TIME)
831 cur_running_time = gst_segment_to_running_time (active_seg,
832 GST_FORMAT_TIME, active_seg->position);
833 }
834
835 if (!GST_CLOCK_TIME_IS_VALID (cur_running_time))
836 return;
837
838 GST_DEBUG_OBJECT (sel, "Cleaning up old cached buffers");
839 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
840 RsnSelectorPad *selpad;
841 GstSegment *seg;
842 RsnSelectorPadCachedBuffer *cached_buffer;
843 GSList *maybe_remove;
844 guint queue_position;
845
846 selpad = GST_SELECTOR_PAD_CAST (walk->data);
847 if (!selpad->cached_buffers)
848 continue;
849
850 seg = &selpad->segment;
851
852 maybe_remove = NULL;
853 queue_position = 0;
854 while ((cached_buffer = g_queue_peek_nth (selpad->cached_buffers,
855 queue_position))) {
856 GstBuffer *buffer = cached_buffer->buffer;
857 GstClockTime running_time;
858 GSList *l;
859
860 /* If we have no valid timestamp we can't sync this buffer */
861 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) {
862 maybe_remove = g_slist_append (maybe_remove, cached_buffer);
863 queue_position = g_slist_length (maybe_remove);
864 continue;
865 }
866
867 /* the buffer is still valid if its duration is valid and the
868 * timestamp + duration is >= time, or if its duration is invalid
869 * and the timestamp is >= time */
870 running_time = GST_BUFFER_TIMESTAMP (buffer);
871 /* If possible try to get the running time at the end of the buffer */
872 if (GST_BUFFER_DURATION_IS_VALID (buffer))
873 running_time += GST_BUFFER_DURATION (buffer);
874 /* Only use the segment to convert to running time if the segment is
875 * in TIME format, otherwise do our best to try to sync */
876 if (GST_CLOCK_TIME_IS_VALID (seg->stop)) {
877 if (running_time > seg->stop) {
878 running_time = seg->stop;
879 }
880 }
881 running_time =
882 gst_segment_to_running_time (seg, GST_FORMAT_TIME, running_time);
883
884 GST_DEBUG_OBJECT (selpad,
885 "checking if buffer %p running time=%" GST_TIME_FORMAT
886 " >= stream time=%" GST_TIME_FORMAT, buffer,
887 GST_TIME_ARGS (running_time), GST_TIME_ARGS (cur_running_time));
888 if (running_time >= cur_running_time) {
889 break;
890 }
891
892 GST_DEBUG_OBJECT (selpad, "Removing old cached buffer %p", buffer);
893 g_queue_pop_nth (selpad->cached_buffers, queue_position);
894 gst_selector_pad_free_cached_buffer (cached_buffer);
895
896 for (l = maybe_remove; l != NULL; l = g_slist_next (l)) {
897 /* A buffer after some invalid buffers was removed, it means the invalid buffers
898 * are old, lets also remove them */
899 cached_buffer = l->data;
900 g_queue_remove (selpad->cached_buffers, cached_buffer);
901 gst_selector_pad_free_cached_buffer (cached_buffer);
902 }
903
904 g_slist_free (maybe_remove);
905 maybe_remove = NULL;
906 queue_position = 0;
907 }
908
909 g_slist_free (maybe_remove);
910 maybe_remove = NULL;
911
912 if (g_queue_is_empty (selpad->cached_buffers)) {
913 g_queue_free (selpad->cached_buffers);
914 selpad->cached_buffers = NULL;
915 }
916 }
917
918 #if DEBUG_CACHED_BUFFERS
919 gst_input_selector_debug_cached_buffers (sel);
920 #endif
921 }
922
923 static GstFlowReturn
gst_selector_pad_chain(GstPad * pad,GstObject * parent,GstBuffer * buf)924 gst_selector_pad_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
925 {
926 RsnInputSelector *sel;
927 GstFlowReturn res;
928 GstPad *active_sinkpad;
929 GstPad *prev_active_sinkpad;
930 RsnSelectorPad *selpad;
931 GstClockTime start_time;
932
933 sel = GST_INPUT_SELECTOR (parent);
934 selpad = GST_SELECTOR_PAD_CAST (pad);
935
936 GST_DEBUG_OBJECT (selpad,
937 "entering chain for buf %p with timestamp %" GST_TIME_FORMAT, buf,
938 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
939
940 GST_INPUT_SELECTOR_LOCK (sel);
941 /* wait or check for flushing */
942 if (gst_input_selector_wait (sel, selpad)) {
943 GST_INPUT_SELECTOR_UNLOCK (sel);
944 goto flushing;
945 }
946
947 GST_LOG_OBJECT (pad, "getting active pad");
948
949 prev_active_sinkpad = sel->active_sinkpad;
950 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
951
952 /* In sync mode wait until the active pad has advanced
953 * after the running time of the current buffer */
954 if (sel->sync_streams) {
955 /* call chain for each cached buffer if we are not the active pad
956 * or if we are the active pad but didn't push anything yet. */
957 if (active_sinkpad != pad || !selpad->pushed) {
958 /* no need to check for sel->cache_buffers as selpad->cached_buffers
959 * will only be valid if cache_buffers is TRUE */
960 if (selpad->cached_buffers && !selpad->sending_cached_buffers) {
961 RsnSelectorPadCachedBuffer *cached_buffer;
962 GstSegment saved_segment;
963
964 saved_segment = selpad->segment;
965
966 selpad->sending_cached_buffers = TRUE;
967 while (!sel->flushing && !selpad->flushing &&
968 (cached_buffer = g_queue_pop_head (selpad->cached_buffers))) {
969 GST_DEBUG_OBJECT (pad, "Cached buffers found, "
970 "invoking chain for cached buffer %p", cached_buffer->buffer);
971
972 selpad->segment = cached_buffer->segment;
973 selpad->events_pending = TRUE;
974 GST_INPUT_SELECTOR_UNLOCK (sel);
975 gst_selector_pad_chain (pad, parent, cached_buffer->buffer);
976 GST_INPUT_SELECTOR_LOCK (sel);
977
978 /* we may have cleaned up the queue in the meantime because of
979 * old buffers */
980 if (!selpad->cached_buffers) {
981 break;
982 }
983 }
984 selpad->sending_cached_buffers = FALSE;
985
986 /* all cached buffers sent, restore segment for current buffer */
987 selpad->segment = saved_segment;
988 selpad->events_pending = TRUE;
989
990 /* Might have changed while calling chain for cached buffers */
991 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
992 }
993 }
994
995 if (active_sinkpad != pad) {
996 GST_INPUT_SELECTOR_UNLOCK (sel);
997 if (gst_input_selector_wait_running_time (sel, selpad, buf))
998 goto flushing;
999 GST_INPUT_SELECTOR_LOCK (sel);
1000 }
1001
1002 /* Might have changed while waiting */
1003 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
1004 }
1005
1006 /* update the segment on the srcpad */
1007 start_time = GST_BUFFER_TIMESTAMP (buf);
1008 if (GST_CLOCK_TIME_IS_VALID (start_time)) {
1009 GST_LOG_OBJECT (pad, "received start time %" GST_TIME_FORMAT,
1010 GST_TIME_ARGS (start_time));
1011 if (GST_BUFFER_DURATION_IS_VALID (buf))
1012 GST_LOG_OBJECT (pad, "received end time %" GST_TIME_FORMAT,
1013 GST_TIME_ARGS (start_time + GST_BUFFER_DURATION (buf)));
1014
1015 GST_OBJECT_LOCK (pad);
1016 selpad->position = start_time;
1017 selpad->segment.position = start_time;
1018 GST_OBJECT_UNLOCK (pad);
1019 }
1020
1021 /* Ignore buffers from pads except the selected one */
1022 if (pad != active_sinkpad)
1023 goto ignore;
1024
1025 /* Tell all non-active pads that we advanced the running time */
1026 if (sel->sync_streams)
1027 GST_INPUT_SELECTOR_BROADCAST (sel);
1028
1029 GST_INPUT_SELECTOR_UNLOCK (sel);
1030
1031 if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) {
1032 g_object_notify (G_OBJECT (sel), "active-pad");
1033 }
1034
1035 /* if we have a pending events, push them now */
1036 if (G_UNLIKELY (prev_active_sinkpad != active_sinkpad
1037 || selpad->events_pending)) {
1038 gst_pad_sticky_events_foreach (GST_PAD_CAST (selpad), forward_sticky_events,
1039 sel);
1040 selpad->events_pending = FALSE;
1041 }
1042
1043 if (selpad->discont) {
1044 buf = gst_buffer_make_writable (buf);
1045
1046 GST_DEBUG_OBJECT (pad, "Marking discont buffer %p", buf);
1047 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
1048 selpad->discont = FALSE;
1049 }
1050
1051 /* forward */
1052 GST_LOG_OBJECT (pad, "Forwarding buffer %p with timestamp %" GST_TIME_FORMAT,
1053 buf, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
1054
1055 res = gst_pad_push (sel->srcpad, gst_buffer_ref (buf));
1056 GST_LOG_OBJECT (pad, "Buffer %p forwarded result=%d", buf, res);
1057
1058 GST_INPUT_SELECTOR_LOCK (sel);
1059
1060 if (sel->sync_streams && sel->cache_buffers) {
1061 /* Might have changed while pushing */
1062 active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
1063 /* only set pad to pushed if we are still the active pad */
1064 if (active_sinkpad == pad)
1065 selpad->pushed = TRUE;
1066
1067 /* cache buffer as we may need it again if we change pads */
1068 gst_selector_pad_cache_buffer (selpad, buf);
1069 gst_input_selector_cleanup_old_cached_buffers (sel, pad);
1070 } else {
1071 selpad->pushed = TRUE;
1072 gst_buffer_unref (buf);
1073 }
1074 GST_INPUT_SELECTOR_UNLOCK (sel);
1075
1076 done:
1077 return res;
1078
1079 /* dropped buffers */
1080 ignore:
1081 {
1082 gboolean active_pad_pushed = GST_SELECTOR_PAD_CAST (active_sinkpad)->pushed;
1083
1084 GST_DEBUG_OBJECT (pad, "Pad not active, discard buffer %p", buf);
1085 /* when we drop a buffer, we're creating a discont on this pad */
1086 selpad->discont = TRUE;
1087 GST_INPUT_SELECTOR_UNLOCK (sel);
1088 gst_buffer_unref (buf);
1089
1090 /* figure out what to return upstream */
1091 GST_OBJECT_LOCK (selpad);
1092 if (selpad->always_ok || !active_pad_pushed)
1093 res = GST_FLOW_OK;
1094 else
1095 res = GST_FLOW_NOT_LINKED;
1096 GST_OBJECT_UNLOCK (selpad);
1097
1098 goto done;
1099 }
1100 flushing:
1101 {
1102 GST_DEBUG_OBJECT (pad, "We are flushing, discard buffer %p", buf);
1103 gst_buffer_unref (buf);
1104 res = GST_FLOW_FLUSHING;
1105 goto done;
1106 }
1107 }
1108
1109 static void gst_input_selector_dispose (GObject * object);
1110 static void gst_input_selector_finalize (GObject * object);
1111
1112 static void gst_input_selector_set_property (GObject * object,
1113 guint prop_id, const GValue * value, GParamSpec * pspec);
1114 static void gst_input_selector_get_property (GObject * object,
1115 guint prop_id, GValue * value, GParamSpec * pspec);
1116
1117 static GstPad *gst_input_selector_request_new_pad (GstElement * element,
1118 GstPadTemplate * templ, const gchar * unused, const GstCaps * caps);
1119 static void gst_input_selector_release_pad (GstElement * element, GstPad * pad);
1120
1121 static GstStateChangeReturn gst_input_selector_change_state (GstElement *
1122 element, GstStateChange transition);
1123
1124 static gboolean gst_input_selector_event (GstPad * pad, GstObject * parent,
1125 GstEvent * event);
1126 static gboolean gst_input_selector_query (GstPad * pad, GstObject * parent,
1127 GstQuery * query);
1128 static gint64 gst_input_selector_block (RsnInputSelector * self);
1129
1130 #define _do_init \
1131 GST_DEBUG_CATEGORY_INIT (input_selector_debug, \
1132 "rsninputselector", 0, "An input stream selector element");
1133 #define gst_input_selector_parent_class parent_class
1134 G_DEFINE_TYPE_WITH_CODE (RsnInputSelector, gst_input_selector, GST_TYPE_ELEMENT,
1135 _do_init);
1136
1137 static void
gst_input_selector_class_init(RsnInputSelectorClass * klass)1138 gst_input_selector_class_init (RsnInputSelectorClass * klass)
1139 {
1140 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
1141 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
1142
1143 gobject_class->dispose = gst_input_selector_dispose;
1144 gobject_class->finalize = gst_input_selector_finalize;
1145
1146 gobject_class->set_property = gst_input_selector_set_property;
1147 gobject_class->get_property = gst_input_selector_get_property;
1148
1149 g_object_class_install_property (gobject_class, PROP_N_PADS,
1150 g_param_spec_uint ("n-pads", "Number of Pads",
1151 "The number of sink pads", 0, G_MAXUINT, 0,
1152 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
1153
1154 g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD,
1155 g_param_spec_object ("active-pad", "Active pad",
1156 "The currently active sink pad", GST_TYPE_PAD,
1157 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
1158
1159 /**
1160 * RsnInputSelector:sync-streams
1161 *
1162 * If set to %TRUE all inactive streams will be synced to the
1163 * running time of the active stream or to the current clock.
1164 *
1165 * To make sure no buffers are dropped by input-selector
1166 * that might be needed when switching the active pad,
1167 * sync-mode should be set to "clock" and cache-buffers to TRUE.
1168 */
1169 g_object_class_install_property (gobject_class, PROP_SYNC_STREAMS,
1170 g_param_spec_boolean ("sync-streams", "Sync Streams",
1171 "Synchronize inactive streams to the running time of the active "
1172 "stream or to the current clock",
1173 DEFAULT_SYNC_STREAMS,
1174 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
1175 GST_PARAM_MUTABLE_READY));
1176
1177 /**
1178 * RsnInputSelector:sync-mode
1179 *
1180 * Select how input-selector will sync buffers when in sync-streams mode.
1181 *
1182 * Note that when using the "active-segment" mode, the "active-segment" may
1183 * be ahead of current clock time when switching the active pad, as the current
1184 * active pad may have pushed more buffers than what was displayed/consumed,
1185 * which may cause delays and some missing buffers.
1186 */
1187 g_object_class_install_property (gobject_class, PROP_SYNC_MODE,
1188 g_param_spec_enum ("sync-mode", "Sync mode",
1189 "Behavior in sync-streams mode", GST_TYPE_INPUT_SELECTOR_SYNC_MODE,
1190 DEFAULT_SYNC_MODE,
1191 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
1192 GST_PARAM_MUTABLE_READY));
1193
1194 /**
1195 * RsnInputSelector:cache-buffers
1196 *
1197 * If set to %TRUE and RsnInputSelector:sync-streams is also set to %TRUE,
1198 * the active pad will cache the buffers still considered valid (after current
1199 * running time, see sync-mode) to avoid missing frames if/when the pad is
1200 * reactivated.
1201 *
1202 * The active pad may push more buffers than what is currently displayed/consumed
1203 * and when changing pads those buffers will be discarded and the only way to
1204 * reactivate that pad without loosing the already consumed buffers is to enable cache.
1205 */
1206 g_object_class_install_property (gobject_class, PROP_CACHE_BUFFERS,
1207 g_param_spec_boolean ("cache-buffers", "Cache Buffers",
1208 "Cache buffers for active-pad",
1209 DEFAULT_CACHE_BUFFERS,
1210 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
1211 GST_PARAM_MUTABLE_READY));
1212
1213 /**
1214 * RsnInputSelector::block:
1215 * @inputselector: the #RsnInputSelector
1216 *
1217 * Block all sink pads in preparation for a switch. Returns the stop time of
1218 * the current switch segment, as a running time, or 0 if there is no current
1219 * active pad or the current active pad never received data.
1220 */
1221 gst_input_selector_signals[SIGNAL_BLOCK] =
1222 g_signal_new ("block", G_TYPE_FROM_CLASS (klass),
1223 G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
1224 G_STRUCT_OFFSET (RsnInputSelectorClass, block), NULL, NULL,
1225 g_cclosure_marshal_generic, G_TYPE_INT64, 0);
1226
1227 gst_element_class_set_static_metadata (gstelement_class, "Input selector",
1228 "Generic", "N-to-1 input stream selector",
1229 "Julien Moutte <julien@moutte.net>, "
1230 "Jan Schmidt <thaytan@mad.scientist.com>, "
1231 "Wim Taymans <wim.taymans@gmail.com>");
1232 gst_element_class_add_static_pad_template (gstelement_class,
1233 &gst_input_selector_sink_factory);
1234 gst_element_class_add_static_pad_template (gstelement_class,
1235 &gst_input_selector_src_factory);
1236
1237 gstelement_class->request_new_pad = gst_input_selector_request_new_pad;
1238 gstelement_class->release_pad = gst_input_selector_release_pad;
1239 gstelement_class->change_state = gst_input_selector_change_state;
1240
1241 klass->block = GST_DEBUG_FUNCPTR (gst_input_selector_block);
1242 }
1243
1244 static void
gst_input_selector_init(RsnInputSelector * sel)1245 gst_input_selector_init (RsnInputSelector * sel)
1246 {
1247 sel->srcpad = gst_pad_new ("src", GST_PAD_SRC);
1248 gst_pad_set_iterate_internal_links_function (sel->srcpad,
1249 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
1250 gst_pad_set_query_function (sel->srcpad,
1251 GST_DEBUG_FUNCPTR (gst_input_selector_query));
1252 gst_pad_set_event_function (sel->srcpad,
1253 GST_DEBUG_FUNCPTR (gst_input_selector_event));
1254 GST_OBJECT_FLAG_SET (sel->srcpad, GST_PAD_FLAG_PROXY_CAPS);
1255 gst_element_add_pad (GST_ELEMENT (sel), sel->srcpad);
1256 /* sinkpad management */
1257 sel->active_sinkpad = NULL;
1258 sel->padcount = 0;
1259 sel->sync_streams = DEFAULT_SYNC_STREAMS;
1260
1261 g_mutex_init (&sel->lock);
1262 g_cond_init (&sel->cond);
1263 sel->blocked = FALSE;
1264
1265 /* lets give a change for downstream to do something on
1266 * active-pad change before we start pushing new buffers */
1267 g_signal_connect_data (sel, "notify::active-pad",
1268 (GCallback) gst_input_selector_active_pad_changed, NULL,
1269 NULL, G_CONNECT_AFTER);
1270 }
1271
1272 static void
gst_input_selector_dispose(GObject * object)1273 gst_input_selector_dispose (GObject * object)
1274 {
1275 RsnInputSelector *sel = GST_INPUT_SELECTOR (object);
1276
1277 if (sel->active_sinkpad) {
1278 gst_object_unref (sel->active_sinkpad);
1279 sel->active_sinkpad = NULL;
1280 }
1281 G_OBJECT_CLASS (parent_class)->dispose (object);
1282 }
1283
1284 static void
gst_input_selector_finalize(GObject * object)1285 gst_input_selector_finalize (GObject * object)
1286 {
1287 RsnInputSelector *sel = GST_INPUT_SELECTOR (object);
1288
1289 g_mutex_clear (&sel->lock);
1290 g_cond_clear (&sel->cond);
1291
1292 G_OBJECT_CLASS (parent_class)->finalize (object);
1293 }
1294
1295 /* this function must be called with the SELECTOR_LOCK. It returns TRUE when the
1296 * active pad changed. */
1297 static gboolean
gst_input_selector_set_active_pad(RsnInputSelector * self,GstPad * pad)1298 gst_input_selector_set_active_pad (RsnInputSelector * self, GstPad * pad)
1299 {
1300 RsnSelectorPad *old, *new;
1301 GstPad **active_pad_p;
1302
1303 if (pad == self->active_sinkpad)
1304 return FALSE;
1305
1306 old = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
1307 new = GST_SELECTOR_PAD_CAST (pad);
1308
1309 GST_DEBUG_OBJECT (self, "setting active pad to %s:%s",
1310 GST_DEBUG_PAD_NAME (new));
1311
1312 if (old)
1313 old->pushed = FALSE;
1314 if (new)
1315 new->pushed = FALSE;
1316
1317 /* Send a new SEGMENT event on the new pad next */
1318 if (old != new && new)
1319 new->events_pending = TRUE;
1320
1321 active_pad_p = &self->active_sinkpad;
1322 gst_object_replace ((GstObject **) active_pad_p, GST_OBJECT_CAST (pad));
1323
1324 if (old && old != new)
1325 gst_pad_push_event (GST_PAD_CAST (old), gst_event_new_reconfigure ());
1326 if (new)
1327 gst_pad_push_event (GST_PAD_CAST (new), gst_event_new_reconfigure ());
1328
1329 GST_DEBUG_OBJECT (self, "New active pad is %" GST_PTR_FORMAT,
1330 self->active_sinkpad);
1331
1332 return TRUE;
1333 }
1334
1335 static void
gst_input_selector_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)1336 gst_input_selector_set_property (GObject * object, guint prop_id,
1337 const GValue * value, GParamSpec * pspec)
1338 {
1339 RsnInputSelector *sel = GST_INPUT_SELECTOR (object);
1340
1341 switch (prop_id) {
1342 case PROP_ACTIVE_PAD:
1343 {
1344 GstPad *pad;
1345
1346 pad = g_value_get_object (value);
1347
1348 GST_INPUT_SELECTOR_LOCK (sel);
1349
1350 #if DEBUG_CACHED_BUFFERS
1351 gst_input_selector_debug_cached_buffers (sel);
1352 #endif
1353
1354 gst_input_selector_set_active_pad (sel, pad);
1355
1356 #if DEBUG_CACHED_BUFFERS
1357 gst_input_selector_debug_cached_buffers (sel);
1358 #endif
1359
1360 GST_INPUT_SELECTOR_UNLOCK (sel);
1361 break;
1362 }
1363 case PROP_SYNC_STREAMS:
1364 GST_INPUT_SELECTOR_LOCK (sel);
1365 sel->sync_streams = g_value_get_boolean (value);
1366 GST_INPUT_SELECTOR_UNLOCK (sel);
1367 break;
1368 case PROP_SYNC_MODE:
1369 GST_INPUT_SELECTOR_LOCK (sel);
1370 sel->sync_mode = g_value_get_enum (value);
1371 GST_INPUT_SELECTOR_UNLOCK (sel);
1372 break;
1373 case PROP_CACHE_BUFFERS:
1374 GST_INPUT_SELECTOR_LOCK (object);
1375 sel->cache_buffers = g_value_get_boolean (value);
1376 GST_INPUT_SELECTOR_UNLOCK (object);
1377 break;
1378 default:
1379 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1380 break;
1381 }
1382 }
1383
1384 static void
gst_input_selector_active_pad_changed(RsnInputSelector * sel,GParamSpec * pspec,gpointer user_data)1385 gst_input_selector_active_pad_changed (RsnInputSelector * sel,
1386 GParamSpec * pspec, gpointer user_data)
1387 {
1388 /* Wake up all non-active pads in sync mode, they might be
1389 * the active pad now */
1390 if (sel->sync_streams)
1391 GST_INPUT_SELECTOR_BROADCAST (sel);
1392 }
1393
1394 static void
gst_input_selector_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)1395 gst_input_selector_get_property (GObject * object, guint prop_id,
1396 GValue * value, GParamSpec * pspec)
1397 {
1398 RsnInputSelector *sel = GST_INPUT_SELECTOR (object);
1399
1400 switch (prop_id) {
1401 case PROP_N_PADS:
1402 GST_INPUT_SELECTOR_LOCK (object);
1403 g_value_set_uint (value, sel->n_pads);
1404 GST_INPUT_SELECTOR_UNLOCK (object);
1405 break;
1406 case PROP_ACTIVE_PAD:
1407 GST_INPUT_SELECTOR_LOCK (object);
1408 g_value_set_object (value, sel->active_sinkpad);
1409 GST_INPUT_SELECTOR_UNLOCK (object);
1410 break;
1411 case PROP_SYNC_STREAMS:
1412 GST_INPUT_SELECTOR_LOCK (object);
1413 g_value_set_boolean (value, sel->sync_streams);
1414 GST_INPUT_SELECTOR_UNLOCK (object);
1415 break;
1416 case PROP_SYNC_MODE:
1417 GST_INPUT_SELECTOR_LOCK (object);
1418 g_value_set_enum (value, sel->sync_mode);
1419 GST_INPUT_SELECTOR_UNLOCK (object);
1420 break;
1421 case PROP_CACHE_BUFFERS:
1422 GST_INPUT_SELECTOR_LOCK (object);
1423 g_value_set_boolean (value, sel->cache_buffers);
1424 GST_INPUT_SELECTOR_UNLOCK (object);
1425 break;
1426 default:
1427 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1428 break;
1429 }
1430 }
1431
1432 static GstPad *
gst_input_selector_get_linked_pad(RsnInputSelector * sel,GstPad * pad,gboolean strict)1433 gst_input_selector_get_linked_pad (RsnInputSelector * sel, GstPad * pad,
1434 gboolean strict)
1435 {
1436 GstPad *otherpad = NULL;
1437
1438 GST_INPUT_SELECTOR_LOCK (sel);
1439 if (pad == sel->srcpad)
1440 otherpad = sel->active_sinkpad;
1441 else if (pad == sel->active_sinkpad || !strict)
1442 otherpad = sel->srcpad;
1443 if (otherpad)
1444 gst_object_ref (otherpad);
1445 GST_INPUT_SELECTOR_UNLOCK (sel);
1446
1447 return otherpad;
1448 }
1449
1450 static gboolean
gst_input_selector_event(GstPad * pad,GstObject * parent,GstEvent * event)1451 gst_input_selector_event (GstPad * pad, GstObject * parent, GstEvent * event)
1452 {
1453 RsnInputSelector *sel;
1454 gboolean result = FALSE;
1455 GstIterator *iter;
1456 gboolean done = FALSE;
1457 GValue item = { 0, };
1458 GstPad *eventpad;
1459 GList *pushed_pads = NULL;
1460
1461 sel = GST_INPUT_SELECTOR (parent);
1462 /* Send upstream events to all sinkpads */
1463 iter = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (sel));
1464
1465 /* This is now essentially a copy of gst_pad_event_default_dispatch
1466 * with a different iterator */
1467 while (!done) {
1468 switch (gst_iterator_next (iter, &item)) {
1469 case GST_ITERATOR_OK:
1470 eventpad = g_value_get_object (&item);
1471
1472 /* if already pushed, skip */
1473 if (g_list_find (pushed_pads, eventpad)) {
1474 g_value_reset (&item);
1475 break;
1476 }
1477
1478 gst_event_ref (event);
1479 result |= gst_pad_push_event (eventpad, event);
1480
1481 g_value_reset (&item);
1482 break;
1483 case GST_ITERATOR_RESYNC:
1484 /* We don't reset the result here because we don't push the event
1485 * again on pads that got the event already and because we need
1486 * to consider the result of the previous pushes */
1487 gst_iterator_resync (iter);
1488 break;
1489 case GST_ITERATOR_ERROR:
1490 GST_ERROR_OBJECT (pad, "Could not iterate over sinkpads");
1491 done = TRUE;
1492 break;
1493 case GST_ITERATOR_DONE:
1494 done = TRUE;
1495 break;
1496 }
1497 }
1498 g_value_unset (&item);
1499 gst_iterator_free (iter);
1500
1501 g_list_free (pushed_pads);
1502
1503 gst_event_unref (event);
1504
1505 return result;
1506 }
1507
1508 /* query on the srcpad. We override this function because by default it will
1509 * only forward the query to one random sinkpad */
1510 static gboolean
gst_input_selector_query(GstPad * pad,GstObject * parent,GstQuery * query)1511 gst_input_selector_query (GstPad * pad, GstObject * parent, GstQuery * query)
1512 {
1513 gboolean res = FALSE;
1514 RsnInputSelector *sel;
1515
1516 sel = GST_INPUT_SELECTOR (parent);
1517
1518 switch (GST_QUERY_TYPE (query)) {
1519 case GST_QUERY_LATENCY:
1520 {
1521 GList *walk;
1522 GstClockTime resmin, resmax;
1523 gboolean reslive;
1524
1525 resmin = 0;
1526 resmax = -1;
1527 reslive = FALSE;
1528
1529 /* perform the query on all sinkpads and combine the results. We take the
1530 * max of min and the min of max for the result latency. */
1531 res = TRUE;
1532 GST_INPUT_SELECTOR_LOCK (sel);
1533 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk;
1534 walk = g_list_next (walk)) {
1535 GstPad *sinkpad = GST_PAD_CAST (walk->data);
1536
1537 if (gst_pad_peer_query (sinkpad, query)) {
1538 GstClockTime min, max;
1539 gboolean live;
1540
1541 gst_query_parse_latency (query, &live, &min, &max);
1542
1543 GST_DEBUG_OBJECT (sinkpad,
1544 "peer latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1545 ", live %d", GST_TIME_ARGS (min), GST_TIME_ARGS (max), live);
1546
1547 if (live) {
1548 if (min > resmin)
1549 resmin = min;
1550 if (resmax == -1)
1551 resmax = max;
1552 else if (max < resmax)
1553 resmax = max;
1554 reslive = TRUE;
1555 }
1556 } else {
1557 GST_LOG_OBJECT (sinkpad, "latency query failed");
1558 res = FALSE;
1559 }
1560 }
1561 GST_INPUT_SELECTOR_UNLOCK (sel);
1562 if (res) {
1563 gst_query_set_latency (query, reslive, resmin, resmax);
1564
1565 GST_DEBUG_OBJECT (sel,
1566 "total latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
1567 ", live %d", GST_TIME_ARGS (resmin), GST_TIME_ARGS (resmax),
1568 reslive);
1569 }
1570
1571 break;
1572 }
1573 default:
1574 res = gst_pad_query_default (pad, parent, query);
1575 break;
1576 }
1577
1578 return res;
1579 }
1580
1581 /* check if the pad is the active sinkpad */
1582 static inline gboolean
gst_input_selector_is_active_sinkpad(RsnInputSelector * sel,GstPad * pad)1583 gst_input_selector_is_active_sinkpad (RsnInputSelector * sel, GstPad * pad)
1584 {
1585 gboolean res;
1586
1587 GST_INPUT_SELECTOR_LOCK (sel);
1588 res = (pad == sel->active_sinkpad);
1589 GST_INPUT_SELECTOR_UNLOCK (sel);
1590
1591 return res;
1592 }
1593
1594 /* Get or create the active sinkpad, must be called with SELECTOR_LOCK */
1595 static GstPad *
gst_input_selector_activate_sinkpad(RsnInputSelector * sel,GstPad * pad)1596 gst_input_selector_activate_sinkpad (RsnInputSelector * sel, GstPad * pad)
1597 {
1598 GstPad *active_sinkpad;
1599 RsnSelectorPad *selpad;
1600
1601 selpad = GST_SELECTOR_PAD_CAST (pad);
1602
1603 selpad->active = TRUE;
1604 active_sinkpad = sel->active_sinkpad;
1605 if (sel->active_sinkpad == NULL) {
1606 GValue item = G_VALUE_INIT;
1607 GstIterator *iter = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (sel));
1608 GstIteratorResult ires;
1609
1610 while ((ires = gst_iterator_next (iter, &item)) == GST_ITERATOR_RESYNC)
1611 gst_iterator_resync (iter);
1612 if (ires == GST_ITERATOR_OK) {
1613 /* If no pad is currently selected, we return the first usable pad to
1614 * guarantee consistency */
1615
1616 active_sinkpad = sel->active_sinkpad = g_value_dup_object (&item);
1617 g_value_reset (&item);
1618 GST_DEBUG_OBJECT (sel, "Activating pad %s:%s",
1619 GST_DEBUG_PAD_NAME (active_sinkpad));
1620 } else
1621 GST_WARNING_OBJECT (sel, "Couldn't find a default sink pad");
1622 gst_iterator_free (iter);
1623 }
1624
1625 return active_sinkpad;
1626 }
1627
1628 static GstPad *
gst_input_selector_request_new_pad(GstElement * element,GstPadTemplate * templ,const gchar * unused,const GstCaps * caps)1629 gst_input_selector_request_new_pad (GstElement * element,
1630 GstPadTemplate * templ, const gchar * unused, const GstCaps * caps)
1631 {
1632 RsnInputSelector *sel;
1633 gchar *name = NULL;
1634 GstPad *sinkpad = NULL;
1635
1636 g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL);
1637
1638 sel = GST_INPUT_SELECTOR (element);
1639
1640 GST_INPUT_SELECTOR_LOCK (sel);
1641
1642 GST_LOG_OBJECT (sel, "Creating new pad %d", sel->padcount);
1643 name = g_strdup_printf ("sink_%u", sel->padcount++);
1644 sinkpad = g_object_new (GST_TYPE_SELECTOR_PAD,
1645 "name", name, "direction", templ->direction, "template", templ, NULL);
1646 g_free (name);
1647
1648 sel->n_pads++;
1649
1650 gst_pad_set_event_function (sinkpad,
1651 GST_DEBUG_FUNCPTR (gst_selector_pad_event));
1652 gst_pad_set_query_function (sinkpad,
1653 GST_DEBUG_FUNCPTR (gst_selector_pad_query));
1654 gst_pad_set_chain_function (sinkpad,
1655 GST_DEBUG_FUNCPTR (gst_selector_pad_chain));
1656 gst_pad_set_iterate_internal_links_function (sinkpad,
1657 GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
1658
1659 GST_OBJECT_FLAG_SET (sinkpad, GST_PAD_FLAG_PROXY_CAPS);
1660 GST_OBJECT_FLAG_SET (sinkpad, GST_PAD_FLAG_PROXY_ALLOCATION);
1661 gst_pad_set_active (sinkpad, TRUE);
1662 gst_element_add_pad (GST_ELEMENT (sel), sinkpad);
1663 GST_INPUT_SELECTOR_UNLOCK (sel);
1664
1665 return sinkpad;
1666 }
1667
1668 static void
gst_input_selector_release_pad(GstElement * element,GstPad * pad)1669 gst_input_selector_release_pad (GstElement * element, GstPad * pad)
1670 {
1671 RsnInputSelector *sel;
1672
1673 sel = GST_INPUT_SELECTOR (element);
1674 GST_LOG_OBJECT (sel, "Releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1675
1676 GST_INPUT_SELECTOR_LOCK (sel);
1677 /* if the pad was the active pad, makes us select a new one */
1678 if (sel->active_sinkpad == pad) {
1679 GST_DEBUG_OBJECT (sel, "Deactivating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1680 gst_object_unref (sel->active_sinkpad);
1681 sel->active_sinkpad = NULL;
1682 }
1683 sel->n_pads--;
1684
1685 gst_pad_set_active (pad, FALSE);
1686 gst_element_remove_pad (GST_ELEMENT (sel), pad);
1687 GST_INPUT_SELECTOR_UNLOCK (sel);
1688 }
1689
1690 static void
gst_input_selector_reset(RsnInputSelector * sel)1691 gst_input_selector_reset (RsnInputSelector * sel)
1692 {
1693 GList *walk;
1694
1695 GST_INPUT_SELECTOR_LOCK (sel);
1696 /* clear active pad */
1697 if (sel->active_sinkpad) {
1698 gst_object_unref (sel->active_sinkpad);
1699 sel->active_sinkpad = NULL;
1700 }
1701 /* reset each of our sinkpads state */
1702 for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
1703 RsnSelectorPad *selpad = GST_SELECTOR_PAD_CAST (walk->data);
1704
1705 gst_selector_pad_reset (selpad);
1706
1707 if (selpad->tags) {
1708 gst_tag_list_unref (selpad->tags);
1709 selpad->tags = NULL;
1710 }
1711 }
1712 GST_INPUT_SELECTOR_UNLOCK (sel);
1713 }
1714
1715 static GstStateChangeReturn
gst_input_selector_change_state(GstElement * element,GstStateChange transition)1716 gst_input_selector_change_state (GstElement * element,
1717 GstStateChange transition)
1718 {
1719 RsnInputSelector *self = GST_INPUT_SELECTOR (element);
1720 GstStateChangeReturn result;
1721
1722 switch (transition) {
1723 case GST_STATE_CHANGE_READY_TO_PAUSED:
1724 GST_INPUT_SELECTOR_LOCK (self);
1725 self->blocked = FALSE;
1726 self->flushing = FALSE;
1727 GST_INPUT_SELECTOR_UNLOCK (self);
1728 break;
1729 case GST_STATE_CHANGE_PAUSED_TO_READY:
1730 /* first unlock before we call the parent state change function, which
1731 * tries to acquire the stream lock when going to ready. */
1732 GST_INPUT_SELECTOR_LOCK (self);
1733 self->blocked = FALSE;
1734 self->flushing = TRUE;
1735 GST_INPUT_SELECTOR_BROADCAST (self);
1736 GST_INPUT_SELECTOR_UNLOCK (self);
1737 break;
1738 default:
1739 break;
1740 }
1741
1742 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1743
1744 switch (transition) {
1745 case GST_STATE_CHANGE_PAUSED_TO_READY:
1746 gst_input_selector_reset (self);
1747 break;
1748 default:
1749 break;
1750 }
1751
1752 return result;
1753 }
1754
1755 static gint64
gst_input_selector_block(RsnInputSelector * self)1756 gst_input_selector_block (RsnInputSelector * self)
1757 {
1758 gint64 ret = 0;
1759 RsnSelectorPad *spad;
1760
1761 GST_INPUT_SELECTOR_LOCK (self);
1762
1763 if (self->blocked)
1764 GST_WARNING_OBJECT (self, "switch already blocked");
1765
1766 self->blocked = TRUE;
1767 spad = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
1768
1769 if (spad)
1770 ret = gst_selector_pad_get_running_time (spad);
1771 else
1772 GST_DEBUG_OBJECT (self, "no active pad while blocking");
1773
1774 GST_INPUT_SELECTOR_UNLOCK (self);
1775
1776 return ret;
1777 }
1778