1 /* GStreamer
2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
4 * 2005 Wim Taymans <wim@fluendo.com>
5 *
6 * gstidentity.c:
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
22 */
23 /**
24 * SECTION:element-identity
25 * @title: identity
26 *
27 * Dummy element that passes incoming data through unmodified. It has some
28 * useful diagnostic functions, such as offset and timestamp checking.
29 */
30
31 #ifdef HAVE_CONFIG_H
32 # include "config.h"
33 #endif
34
35 #include <stdlib.h>
36 #include <string.h>
37
38 #include "gstelements_private.h"
39 #include "../../gst/gst-i18n-lib.h"
40 #include "gstidentity.h"
41 #include "gstcoreelementselements.h"
42
43 static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
44 GST_PAD_SINK,
45 GST_PAD_ALWAYS,
46 GST_STATIC_CAPS_ANY);
47
48 static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
49 GST_PAD_SRC,
50 GST_PAD_ALWAYS,
51 GST_STATIC_CAPS_ANY);
52
53 GST_DEBUG_CATEGORY_STATIC (gst_identity_debug);
54 #define GST_CAT_DEFAULT gst_identity_debug
55
56 /* Identity signals and args */
57 enum
58 {
59 SIGNAL_HANDOFF,
60 /* FILL ME */
61 LAST_SIGNAL
62 };
63
64 #define DEFAULT_SLEEP_TIME 0
65 #define DEFAULT_DUPLICATE 1
66 #define DEFAULT_ERROR_AFTER -1
67 #define DEFAULT_DROP_PROBABILITY 0.0
68 #define DEFAULT_DROP_BUFFER_FLAGS 0
69 #define DEFAULT_DATARATE 0
70 #define DEFAULT_SILENT TRUE
71 #define DEFAULT_SINGLE_SEGMENT FALSE
72 #define DEFAULT_DUMP FALSE
73 #define DEFAULT_SYNC FALSE
74 #define DEFAULT_CHECK_IMPERFECT_TIMESTAMP FALSE
75 #define DEFAULT_CHECK_IMPERFECT_OFFSET FALSE
76 #define DEFAULT_SIGNAL_HANDOFFS TRUE
77 #define DEFAULT_TS_OFFSET 0
78 #define DEFAULT_DROP_ALLOCATION FALSE
79 #define DEFAULT_EOS_AFTER -1
80
81 enum
82 {
83 PROP_0,
84 PROP_SLEEP_TIME,
85 PROP_ERROR_AFTER,
86 PROP_DROP_PROBABILITY,
87 PROP_DROP_BUFFER_FLAGS,
88 PROP_DATARATE,
89 PROP_SILENT,
90 PROP_SINGLE_SEGMENT,
91 PROP_LAST_MESSAGE,
92 PROP_DUMP,
93 PROP_SYNC,
94 PROP_TS_OFFSET,
95 PROP_CHECK_IMPERFECT_TIMESTAMP,
96 PROP_CHECK_IMPERFECT_OFFSET,
97 PROP_SIGNAL_HANDOFFS,
98 PROP_DROP_ALLOCATION,
99 PROP_EOS_AFTER,
100 PROP_STATS
101 };
102
103
104 #define _do_init \
105 GST_DEBUG_CATEGORY_INIT (gst_identity_debug, "identity", 0, "identity element");
106 #define gst_identity_parent_class parent_class
107 G_DEFINE_TYPE_WITH_CODE (GstIdentity, gst_identity, GST_TYPE_BASE_TRANSFORM,
108 _do_init);
109 GST_ELEMENT_REGISTER_DEFINE (identity, "identity", GST_RANK_NONE,
110 GST_TYPE_IDENTITY);
111
112 static void gst_identity_finalize (GObject * object);
113 static void gst_identity_set_property (GObject * object, guint prop_id,
114 const GValue * value, GParamSpec * pspec);
115 static void gst_identity_get_property (GObject * object, guint prop_id,
116 GValue * value, GParamSpec * pspec);
117
118 static gboolean gst_identity_sink_event (GstBaseTransform * trans,
119 GstEvent * event);
120 static gboolean gst_identity_src_event (GstBaseTransform * trans,
121 GstEvent * event);
122 static GstFlowReturn gst_identity_transform_ip (GstBaseTransform * trans,
123 GstBuffer * buf);
124 static gboolean gst_identity_start (GstBaseTransform * trans);
125 static gboolean gst_identity_stop (GstBaseTransform * trans);
126 static GstStateChangeReturn gst_identity_change_state (GstElement * element,
127 GstStateChange transition);
128 static gboolean gst_identity_accept_caps (GstBaseTransform * base,
129 GstPadDirection direction, GstCaps * caps);
130 static gboolean gst_identity_query (GstBaseTransform * base,
131 GstPadDirection direction, GstQuery * query);
132 static GstClock *gst_identity_provide_clock (GstElement * element);
133
134 static guint gst_identity_signals[LAST_SIGNAL] = { 0 };
135
136 static GParamSpec *pspec_last_message = NULL;
137
138 static void
gst_identity_finalize(GObject * object)139 gst_identity_finalize (GObject * object)
140 {
141 GstIdentity *identity;
142
143 identity = GST_IDENTITY (object);
144
145 g_free (identity->last_message);
146 g_cond_clear (&identity->blocked_cond);
147
148 G_OBJECT_CLASS (parent_class)->finalize (object);
149 }
150
151 static void
gst_identity_class_init(GstIdentityClass * klass)152 gst_identity_class_init (GstIdentityClass * klass)
153 {
154 GObjectClass *gobject_class;
155 GstElementClass *gstelement_class;
156 GstBaseTransformClass *gstbasetrans_class;
157
158 gobject_class = G_OBJECT_CLASS (klass);
159 gstelement_class = GST_ELEMENT_CLASS (klass);
160 gstbasetrans_class = GST_BASE_TRANSFORM_CLASS (klass);
161
162 gobject_class->set_property = gst_identity_set_property;
163 gobject_class->get_property = gst_identity_get_property;
164
165 g_object_class_install_property (gobject_class, PROP_SLEEP_TIME,
166 g_param_spec_uint ("sleep-time", "Sleep time",
167 "Microseconds to sleep between processing", 0, G_MAXUINT,
168 DEFAULT_SLEEP_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
169 g_object_class_install_property (gobject_class, PROP_ERROR_AFTER,
170 g_param_spec_int ("error-after", "Error After", "Error after N buffers",
171 -1, G_MAXINT, DEFAULT_ERROR_AFTER,
172 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
173 g_object_class_install_property (gobject_class, PROP_DROP_PROBABILITY,
174 g_param_spec_float ("drop-probability", "Drop Probability",
175 "The Probability a buffer is dropped", 0.0, 1.0,
176 DEFAULT_DROP_PROBABILITY,
177 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
178
179 /**
180 * GstIdentity:drop-buffer-flags:
181 *
182 * Drop buffers with the given flags.
183 *
184 * Since: 1.8
185 **/
186 g_object_class_install_property (gobject_class, PROP_DROP_BUFFER_FLAGS,
187 g_param_spec_flags ("drop-buffer-flags", "Check flags to drop buffers",
188 "Drop buffers with the given flags",
189 GST_TYPE_BUFFER_FLAGS, DEFAULT_DROP_BUFFER_FLAGS,
190 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
191 g_object_class_install_property (gobject_class, PROP_DATARATE,
192 g_param_spec_int ("datarate", "Datarate",
193 "(Re)timestamps buffers with number of bytes per second (0 = inactive)",
194 0, G_MAXINT, DEFAULT_DATARATE,
195 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
196 g_object_class_install_property (gobject_class, PROP_SILENT,
197 g_param_spec_boolean ("silent", "silent", "silent", DEFAULT_SILENT,
198 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
199 g_object_class_install_property (gobject_class, PROP_SINGLE_SEGMENT,
200 g_param_spec_boolean ("single-segment", "Single Segment",
201 "Timestamp buffers and eat segments so as to appear as one segment",
202 DEFAULT_SINGLE_SEGMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
203 pspec_last_message = g_param_spec_string ("last-message", "last-message",
204 "last-message", NULL, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
205 g_object_class_install_property (gobject_class, PROP_LAST_MESSAGE,
206 pspec_last_message);
207 g_object_class_install_property (gobject_class, PROP_DUMP,
208 g_param_spec_boolean ("dump", "Dump", "Dump buffer contents to stdout",
209 DEFAULT_DUMP, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
210 g_object_class_install_property (gobject_class, PROP_SYNC,
211 g_param_spec_boolean ("sync", "Synchronize",
212 "Synchronize to pipeline clock", DEFAULT_SYNC,
213 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
214 g_object_class_install_property (gobject_class, PROP_TS_OFFSET,
215 g_param_spec_int64 ("ts-offset", "Timestamp offset for synchronisation",
216 "Timestamp offset in nanoseconds for synchronisation, negative for earlier sync",
217 G_MININT64, G_MAXINT64, DEFAULT_TS_OFFSET,
218 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
219 g_object_class_install_property (gobject_class,
220 PROP_CHECK_IMPERFECT_TIMESTAMP,
221 g_param_spec_boolean ("check-imperfect-timestamp",
222 "Check for discontiguous timestamps",
223 "Send element messages if timestamps and durations do not match up",
224 DEFAULT_CHECK_IMPERFECT_TIMESTAMP,
225 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
226 g_object_class_install_property (gobject_class, PROP_CHECK_IMPERFECT_OFFSET,
227 g_param_spec_boolean ("check-imperfect-offset",
228 "Check for discontiguous offset",
229 "Send element messages if offset and offset_end do not match up",
230 DEFAULT_CHECK_IMPERFECT_OFFSET,
231 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
232
233 /**
234 * GstIdentity:signal-handoffs
235 *
236 * If set to %TRUE, the identity will emit a handoff signal when handling a buffer.
237 * When set to %FALSE, no signal will be emitted, which might improve performance.
238 */
239 g_object_class_install_property (gobject_class, PROP_SIGNAL_HANDOFFS,
240 g_param_spec_boolean ("signal-handoffs",
241 "Signal handoffs", "Send a signal before pushing the buffer",
242 DEFAULT_SIGNAL_HANDOFFS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
243
244 g_object_class_install_property (gobject_class, PROP_DROP_ALLOCATION,
245 g_param_spec_boolean ("drop-allocation", "Drop allocation query",
246 "Don't forward allocation queries", DEFAULT_DROP_ALLOCATION,
247 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
248
249 /**
250 * GstIdentity:eos-after
251 *
252 * EOS after N buffers.
253 *
254 * Since: 1.16
255 **/
256 g_object_class_install_property (gobject_class, PROP_EOS_AFTER,
257 g_param_spec_int ("eos-after", "EOS After", "EOS after N buffers",
258 -1, G_MAXINT, DEFAULT_EOS_AFTER,
259 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
260
261 /**
262 * GstIdentity::handoff:
263 * @identity: the identity instance
264 * @buffer: the buffer that just has been received
265 * @pad: the pad that received it
266 *
267 * This signal gets emitted before passing the buffer downstream.
268 */
269 gst_identity_signals[SIGNAL_HANDOFF] =
270 g_signal_new ("handoff", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
271 G_STRUCT_OFFSET (GstIdentityClass, handoff), NULL, NULL,
272 NULL, G_TYPE_NONE, 1, GST_TYPE_BUFFER | G_SIGNAL_TYPE_STATIC_SCOPE);
273
274 /**
275 * GstIdentity:stats:
276
277 * Various statistics. This property returns a GstStructure
278 * with name application/x-identity-stats with the following fields:
279 *
280 * <itemizedlist>
281 * <listitem>
282 * <para>
283 * #guint64
284 * <classname>"num-buffers"</classname>:
285 * the number of buffers that passed through.
286 * </para>
287 * </listitem>
288 * <listitem>
289 * <para>
290 * #guint64
291 * <classname>"num-bytes"</classname>:
292 * the number of bytes that passed through.
293 * </para>
294 * </listitem>
295 * </itemizedlist>
296 *
297 * Since: 1.20
298 */
299 g_object_class_install_property (gobject_class, PROP_STATS,
300 g_param_spec_boxed ("stats", "Statistics",
301 "Statistics", GST_TYPE_STRUCTURE,
302 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
303
304 gobject_class->finalize = gst_identity_finalize;
305
306 gst_element_class_set_static_metadata (gstelement_class,
307 "Identity",
308 "Generic",
309 "Pass data without modification", "Erik Walthinsen <omega@cse.ogi.edu>");
310 gst_element_class_add_static_pad_template (gstelement_class, &srctemplate);
311 gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
312
313 gstelement_class->change_state =
314 GST_DEBUG_FUNCPTR (gst_identity_change_state);
315 gstelement_class->provide_clock =
316 GST_DEBUG_FUNCPTR (gst_identity_provide_clock);
317
318 gstbasetrans_class->sink_event = GST_DEBUG_FUNCPTR (gst_identity_sink_event);
319 gstbasetrans_class->src_event = GST_DEBUG_FUNCPTR (gst_identity_src_event);
320 gstbasetrans_class->transform_ip =
321 GST_DEBUG_FUNCPTR (gst_identity_transform_ip);
322 gstbasetrans_class->start = GST_DEBUG_FUNCPTR (gst_identity_start);
323 gstbasetrans_class->stop = GST_DEBUG_FUNCPTR (gst_identity_stop);
324 gstbasetrans_class->accept_caps =
325 GST_DEBUG_FUNCPTR (gst_identity_accept_caps);
326 gstbasetrans_class->query = gst_identity_query;
327 }
328
329 static void
gst_identity_init(GstIdentity * identity)330 gst_identity_init (GstIdentity * identity)
331 {
332 identity->sleep_time = DEFAULT_SLEEP_TIME;
333 identity->error_after = DEFAULT_ERROR_AFTER;
334 identity->error_after_counter = DEFAULT_ERROR_AFTER;
335 identity->drop_probability = DEFAULT_DROP_PROBABILITY;
336 identity->drop_buffer_flags = DEFAULT_DROP_BUFFER_FLAGS;
337 identity->datarate = DEFAULT_DATARATE;
338 identity->silent = DEFAULT_SILENT;
339 identity->single_segment = DEFAULT_SINGLE_SEGMENT;
340 identity->sync = DEFAULT_SYNC;
341 identity->check_imperfect_timestamp = DEFAULT_CHECK_IMPERFECT_TIMESTAMP;
342 identity->check_imperfect_offset = DEFAULT_CHECK_IMPERFECT_OFFSET;
343 identity->dump = DEFAULT_DUMP;
344 identity->last_message = NULL;
345 identity->signal_handoffs = DEFAULT_SIGNAL_HANDOFFS;
346 identity->ts_offset = DEFAULT_TS_OFFSET;
347 g_cond_init (&identity->blocked_cond);
348 identity->eos_after = DEFAULT_EOS_AFTER;
349 identity->eos_after_counter = DEFAULT_EOS_AFTER;
350
351 gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM_CAST (identity), TRUE);
352
353 GST_OBJECT_FLAG_SET (identity, GST_ELEMENT_FLAG_REQUIRE_CLOCK);
354 }
355
356 static void
gst_identity_notify_last_message(GstIdentity * identity)357 gst_identity_notify_last_message (GstIdentity * identity)
358 {
359 g_object_notify_by_pspec ((GObject *) identity, pspec_last_message);
360 }
361
362 static GstFlowReturn
gst_identity_do_sync(GstIdentity * identity,GstClockTime running_time)363 gst_identity_do_sync (GstIdentity * identity, GstClockTime running_time)
364 {
365 GstFlowReturn ret = GST_FLOW_OK;
366
367 if (identity->sync &&
368 GST_BASE_TRANSFORM_CAST (identity)->segment.format == GST_FORMAT_TIME) {
369 GstClock *clock;
370
371 GST_OBJECT_LOCK (identity);
372
373 if (identity->flushing) {
374 GST_OBJECT_UNLOCK (identity);
375 return GST_FLOW_FLUSHING;
376 }
377
378 while (identity->blocked && !identity->flushing)
379 g_cond_wait (&identity->blocked_cond, GST_OBJECT_GET_LOCK (identity));
380
381 if (identity->flushing) {
382 GST_OBJECT_UNLOCK (identity);
383 return GST_FLOW_FLUSHING;
384 }
385
386 if ((clock = GST_ELEMENT (identity)->clock)) {
387 GstClockReturn cret;
388 GstClockTime timestamp;
389 GstClockTimeDiff ts_offset = identity->ts_offset;
390
391 timestamp = running_time + GST_ELEMENT (identity)->base_time +
392 identity->upstream_latency;
393 if (ts_offset < 0) {
394 ts_offset = -ts_offset;
395 if (ts_offset < timestamp)
396 timestamp -= ts_offset;
397 else
398 timestamp = 0;
399 } else
400 timestamp += ts_offset;
401
402 /* save id if we need to unlock */
403 identity->clock_id = gst_clock_new_single_shot_id (clock, timestamp);
404 GST_OBJECT_UNLOCK (identity);
405
406 cret = gst_clock_id_wait (identity->clock_id, NULL);
407
408 GST_OBJECT_LOCK (identity);
409 if (identity->clock_id) {
410 gst_clock_id_unref (identity->clock_id);
411 identity->clock_id = NULL;
412 }
413 if (cret == GST_CLOCK_UNSCHEDULED || identity->flushing)
414 ret = GST_FLOW_FLUSHING;
415 }
416 GST_OBJECT_UNLOCK (identity);
417 }
418
419 return ret;
420 }
421
422 static gboolean
gst_identity_sink_event(GstBaseTransform * trans,GstEvent * event)423 gst_identity_sink_event (GstBaseTransform * trans, GstEvent * event)
424 {
425 GstIdentity *identity;
426 gboolean ret = TRUE;
427
428 identity = GST_IDENTITY (trans);
429
430 if (!identity->silent) {
431 const GstStructure *s;
432 const gchar *tstr;
433 gchar *sstr;
434
435 GST_OBJECT_LOCK (identity);
436 g_free (identity->last_message);
437
438 tstr = gst_event_type_get_name (GST_EVENT_TYPE (event));
439 if ((s = gst_event_get_structure (event)))
440 sstr = gst_structure_to_string (s);
441 else
442 sstr = g_strdup ("");
443
444 identity->last_message =
445 g_strdup_printf ("event ******* (%s:%s) E (type: %s (%d), %s) %p",
446 GST_DEBUG_PAD_NAME (trans->sinkpad), tstr, GST_EVENT_TYPE (event),
447 sstr, event);
448 g_free (sstr);
449 GST_OBJECT_UNLOCK (identity);
450
451 gst_identity_notify_last_message (identity);
452 }
453
454 if (identity->single_segment && (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT)) {
455 if (!trans->have_segment) {
456 GstEvent *news;
457 GstSegment segment;
458
459 gst_event_copy_segment (event, &segment);
460 gst_event_copy_segment (event, &trans->segment);
461 trans->have_segment = TRUE;
462
463 /* This is the first segment, send out a (0, -1) segment */
464 gst_segment_init (&segment, segment.format);
465 if (identity->seek_segment.format != GST_FORMAT_UNDEFINED) {
466 segment.time = identity->seek_segment.time;
467 segment.base = identity->seek_segment.base;
468 gst_segment_init (&identity->seek_segment, GST_FORMAT_UNDEFINED);
469 }
470
471 news = gst_event_new_segment (&segment);
472 GST_EVENT_SEQNUM (news) = GST_EVENT_SEQNUM (event);
473
474 gst_pad_event_default (trans->sinkpad, GST_OBJECT_CAST (trans), news);
475 } else {
476 /* need to track segment for proper running time */
477 gst_event_copy_segment (event, &trans->segment);
478 }
479 }
480
481 if (GST_EVENT_TYPE (event) == GST_EVENT_GAP &&
482 trans->have_segment && trans->segment.format == GST_FORMAT_TIME) {
483 GstClockTime start, dur, old_start;
484
485 gst_event_parse_gap (event, &old_start, &dur);
486
487 start = gst_segment_to_running_time (&trans->segment,
488 GST_FORMAT_TIME, old_start);
489
490 gst_identity_do_sync (identity,
491 GST_CLOCK_TIME_IS_VALID (start) ? start : 0);
492
493 /* also transform GAP timestamp similar to buffer timestamps */
494 if (identity->single_segment) {
495 guint64 clip_start, clip_stop;
496 if (GST_CLOCK_TIME_IS_VALID (start)) {
497 gst_event_unref (event);
498 event = gst_event_new_gap (start, dur);
499 } else if (GST_CLOCK_TIME_IS_VALID (dur) &&
500 gst_segment_clip (&trans->segment, GST_FORMAT_TIME, old_start,
501 old_start + dur, &clip_start, &clip_stop)) {
502 gst_event_unref (event);
503 event = gst_event_new_gap (clip_start, clip_stop - clip_start);
504 } else {
505 /* Gap event is completely outside the segment, drop it */
506 GST_DEBUG_OBJECT (identity,
507 "Dropping GAP event outside segment: %" GST_PTR_FORMAT, event);
508 gst_event_unref (event);
509 ret = TRUE;
510 goto done;
511 }
512 }
513 }
514
515 /* Reset previous timestamp, duration and offsets on SEGMENT
516 * to prevent false warnings when checking for perfect streams */
517 if (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
518 identity->prev_timestamp = identity->prev_duration = GST_CLOCK_TIME_NONE;
519 identity->prev_offset = identity->prev_offset_end = GST_BUFFER_OFFSET_NONE;
520 }
521
522 if (identity->single_segment && GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
523 /* eat up segments */
524 gst_event_unref (event);
525 ret = TRUE;
526 goto done;
527 }
528
529 switch (GST_EVENT_TYPE (event)) {
530 case GST_EVENT_FLUSH_START:
531 GST_OBJECT_LOCK (identity);
532 identity->flushing = TRUE;
533 g_cond_signal (&identity->blocked_cond);
534 if (identity->clock_id) {
535 GST_DEBUG_OBJECT (identity, "unlock clock wait");
536 gst_clock_id_unschedule (identity->clock_id);
537 }
538 GST_OBJECT_UNLOCK (identity);
539 break;
540 case GST_EVENT_FLUSH_STOP:
541 GST_OBJECT_LOCK (identity);
542 identity->flushing = FALSE;
543 trans->have_segment = FALSE;
544 GST_OBJECT_UNLOCK (identity);
545 break;
546 default:
547 break;
548 }
549
550 ret = GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event);
551
552 done:
553 return ret;
554 }
555
556 static gboolean
gst_identity_src_event(GstBaseTransform * trans,GstEvent * event)557 gst_identity_src_event (GstBaseTransform * trans, GstEvent * event)
558 {
559 GstIdentity *identity = GST_IDENTITY (trans);
560
561 switch (GST_EVENT_TYPE (event)) {
562 case GST_EVENT_SEEK:
563 {
564 gdouble rate;
565 GstFormat fmt;
566 GstSeekFlags flags;
567 GstSeekType start_type, stop_type;
568 gint64 start, stop;
569 gst_event_parse_seek (event, &rate, &fmt, &flags, &start_type,
570 &start, &stop_type, &stop);
571
572 GST_OBJECT_LOCK (identity);
573 gst_segment_init (&identity->seek_segment, fmt);
574 if (!gst_segment_do_seek (&identity->seek_segment, rate, fmt,
575 flags, start_type, start, stop_type, stop, NULL)) {
576 GST_WARNING_OBJECT (identity, "Could not run seek %" GST_PTR_FORMAT,
577 event);
578 GST_OBJECT_UNLOCK (identity);
579
580 return FALSE;
581 }
582 GST_OBJECT_UNLOCK (identity);
583
584 break;
585 }
586 default:
587 break;
588 }
589
590 return GST_BASE_TRANSFORM_CLASS (parent_class)->src_event (trans, event);
591 }
592
593 static void
gst_identity_check_imperfect_timestamp(GstIdentity * identity,GstBuffer * buf)594 gst_identity_check_imperfect_timestamp (GstIdentity * identity, GstBuffer * buf)
595 {
596 GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buf);
597
598 /* invalid timestamp drops us out of check. FIXME: maybe warn ? */
599 if (timestamp != GST_CLOCK_TIME_NONE) {
600 /* check if we had a previous buffer to compare to */
601 if (identity->prev_timestamp != GST_CLOCK_TIME_NONE &&
602 identity->prev_duration != GST_CLOCK_TIME_NONE) {
603 GstClockTime t_expected;
604 GstClockTimeDiff dt;
605
606 t_expected = identity->prev_timestamp + identity->prev_duration;
607 dt = GST_CLOCK_DIFF (t_expected, timestamp);
608 if (dt != 0) {
609 /*
610 * "imperfect-timestamp" bus message:
611 * @identity: the identity instance
612 * @delta: the GST_CLOCK_DIFF to the prev timestamp
613 * @prev-timestamp: the previous buffer timestamp
614 * @prev-duration: the previous buffer duration
615 * @prev-offset: the previous buffer offset
616 * @prev-offset-end: the previous buffer offset end
617 * @cur-timestamp: the current buffer timestamp
618 * @cur-duration: the current buffer duration
619 * @cur-offset: the current buffer offset
620 * @cur-offset-end: the current buffer offset end
621 *
622 * This bus message gets emitted if the check-imperfect-timestamp
623 * property is set and there is a gap in time between the
624 * last buffer and the newly received buffer.
625 */
626 gst_element_post_message (GST_ELEMENT (identity),
627 gst_message_new_element (GST_OBJECT (identity),
628 gst_structure_new ("imperfect-timestamp",
629 "delta", G_TYPE_INT64, dt,
630 "prev-timestamp", G_TYPE_UINT64,
631 identity->prev_timestamp, "prev-duration", G_TYPE_UINT64,
632 identity->prev_duration, "prev-offset", G_TYPE_UINT64,
633 identity->prev_offset, "prev-offset-end", G_TYPE_UINT64,
634 identity->prev_offset_end, "cur-timestamp", G_TYPE_UINT64,
635 timestamp, "cur-duration", G_TYPE_UINT64,
636 GST_BUFFER_DURATION (buf), "cur-offset", G_TYPE_UINT64,
637 GST_BUFFER_OFFSET (buf), "cur-offset-end", G_TYPE_UINT64,
638 GST_BUFFER_OFFSET_END (buf), NULL)));
639 }
640 } else {
641 GST_DEBUG_OBJECT (identity, "can't check data-contiguity, no "
642 "offset_end was set on previous buffer");
643 }
644 }
645 }
646
647 static void
gst_identity_check_imperfect_offset(GstIdentity * identity,GstBuffer * buf)648 gst_identity_check_imperfect_offset (GstIdentity * identity, GstBuffer * buf)
649 {
650 guint64 offset;
651
652 offset = GST_BUFFER_OFFSET (buf);
653
654 if (identity->prev_offset_end != offset &&
655 identity->prev_offset_end != GST_BUFFER_OFFSET_NONE &&
656 offset != GST_BUFFER_OFFSET_NONE) {
657 /*
658 * "imperfect-offset" bus message:
659 * @identity: the identity instance
660 * @prev-timestamp: the previous buffer timestamp
661 * @prev-duration: the previous buffer duration
662 * @prev-offset: the previous buffer offset
663 * @prev-offset-end: the previous buffer offset end
664 * @cur-timestamp: the current buffer timestamp
665 * @cur-duration: the current buffer duration
666 * @cur-offset: the current buffer offset
667 * @cur-offset-end: the current buffer offset end
668 *
669 * This bus message gets emitted if the check-imperfect-offset
670 * property is set and there is a gap in offsets between the
671 * last buffer and the newly received buffer.
672 */
673 gst_element_post_message (GST_ELEMENT (identity),
674 gst_message_new_element (GST_OBJECT (identity),
675 gst_structure_new ("imperfect-offset", "prev-timestamp",
676 G_TYPE_UINT64, identity->prev_timestamp, "prev-duration",
677 G_TYPE_UINT64, identity->prev_duration, "prev-offset",
678 G_TYPE_UINT64, identity->prev_offset, "prev-offset-end",
679 G_TYPE_UINT64, identity->prev_offset_end, "cur-timestamp",
680 G_TYPE_UINT64, GST_BUFFER_TIMESTAMP (buf), "cur-duration",
681 G_TYPE_UINT64, GST_BUFFER_DURATION (buf), "cur-offset",
682 G_TYPE_UINT64, GST_BUFFER_OFFSET (buf), "cur-offset-end",
683 G_TYPE_UINT64, GST_BUFFER_OFFSET_END (buf), NULL)));
684 } else {
685 GST_DEBUG_OBJECT (identity, "can't check offset contiguity, no offset "
686 "and/or offset_end were set on previous buffer");
687 }
688 }
689
690 static const gchar *
print_pretty_time(gchar * ts_str,gsize ts_str_len,GstClockTime ts)691 print_pretty_time (gchar * ts_str, gsize ts_str_len, GstClockTime ts)
692 {
693 if (ts == GST_CLOCK_TIME_NONE)
694 return "none";
695
696 g_snprintf (ts_str, ts_str_len, "%" GST_TIME_FORMAT, GST_TIME_ARGS (ts));
697 return ts_str;
698 }
699
700 static void
gst_identity_update_last_message_for_buffer(GstIdentity * identity,const gchar * action,GstBuffer * buf,gsize size)701 gst_identity_update_last_message_for_buffer (GstIdentity * identity,
702 const gchar * action, GstBuffer * buf, gsize size)
703 {
704 gchar dts_str[64], pts_str[64], dur_str[64];
705 gchar *flag_str, *meta_str;
706
707 GST_OBJECT_LOCK (identity);
708
709 flag_str = gst_buffer_get_flags_string (buf);
710 meta_str = gst_buffer_get_meta_string (buf);
711
712 g_free (identity->last_message);
713 identity->last_message = g_strdup_printf ("%s ******* (%s:%s) "
714 "(%" G_GSIZE_FORMAT " bytes, dts: %s, pts: %s, duration: %s, offset: %"
715 G_GINT64_FORMAT ", " "offset_end: % " G_GINT64_FORMAT
716 ", flags: %08x %s, meta: %s) %p", action,
717 GST_DEBUG_PAD_NAME (GST_BASE_TRANSFORM_CAST (identity)->sinkpad), size,
718 print_pretty_time (dts_str, sizeof (dts_str), GST_BUFFER_DTS (buf)),
719 print_pretty_time (pts_str, sizeof (pts_str), GST_BUFFER_PTS (buf)),
720 print_pretty_time (dur_str, sizeof (dur_str), GST_BUFFER_DURATION (buf)),
721 GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET_END (buf),
722 GST_BUFFER_FLAGS (buf), flag_str, meta_str ? meta_str : "none", buf);
723 g_free (flag_str);
724 g_free (meta_str);
725 GST_TRACE_OBJECT (identity, "%s", identity->last_message);
726
727 GST_OBJECT_UNLOCK (identity);
728
729 gst_identity_notify_last_message (identity);
730 }
731
732 static GstFlowReturn
gst_identity_transform_ip(GstBaseTransform * trans,GstBuffer * buf)733 gst_identity_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
734 {
735 GstFlowReturn ret = GST_FLOW_OK;
736 GstIdentity *identity = GST_IDENTITY (trans);
737 GstClockTime rundts = GST_CLOCK_TIME_NONE;
738 GstClockTime runpts = GST_CLOCK_TIME_NONE;
739 GstClockTime ts, duration, runtimestamp;
740 gsize size;
741
742 size = gst_buffer_get_size (buf);
743
744 if (identity->check_imperfect_timestamp)
745 gst_identity_check_imperfect_timestamp (identity, buf);
746 if (identity->check_imperfect_offset)
747 gst_identity_check_imperfect_offset (identity, buf);
748
749 /* update prev values */
750 identity->prev_timestamp = GST_BUFFER_TIMESTAMP (buf);
751 identity->prev_duration = GST_BUFFER_DURATION (buf);
752 identity->prev_offset_end = GST_BUFFER_OFFSET_END (buf);
753 identity->prev_offset = GST_BUFFER_OFFSET (buf);
754
755 if (identity->error_after_counter >= 0) {
756 identity->error_after_counter--;
757 if (identity->error_after_counter == 0)
758 goto error_after;
759 }
760
761 if (identity->eos_after_counter >= 0) {
762 identity->eos_after_counter--;
763 if (identity->eos_after_counter == 0)
764 goto eos_after;
765 }
766
767 if (identity->drop_probability > 0.0) {
768 if ((gfloat) (1.0 * rand () / (RAND_MAX)) < identity->drop_probability)
769 goto dropped;
770 }
771
772 if (GST_BUFFER_FLAG_IS_SET (buf, identity->drop_buffer_flags))
773 goto dropped;
774
775 if (identity->dump) {
776 GstMapInfo info;
777
778 if (gst_buffer_map (buf, &info, GST_MAP_READ)) {
779 gst_util_dump_mem (info.data, info.size);
780 gst_buffer_unmap (buf, &info);
781 }
782 }
783
784 if (!identity->silent) {
785 gst_identity_update_last_message_for_buffer (identity, "chain", buf, size);
786 }
787
788 if (identity->datarate > 0) {
789 GstClockTime time = gst_util_uint64_scale_int (identity->offset,
790 GST_SECOND, identity->datarate);
791
792 GST_BUFFER_PTS (buf) = GST_BUFFER_DTS (buf) = time;
793 GST_BUFFER_DURATION (buf) = size * GST_SECOND / identity->datarate;
794 }
795
796 if (identity->signal_handoffs)
797 g_signal_emit (identity, gst_identity_signals[SIGNAL_HANDOFF], 0, buf);
798
799 if (trans->segment.format == GST_FORMAT_TIME) {
800 if (trans->segment.rate > 0) {
801 runpts = gst_segment_to_running_time (&trans->segment,
802 GST_FORMAT_TIME, GST_BUFFER_PTS (buf));
803 rundts = gst_segment_to_running_time (&trans->segment,
804 GST_FORMAT_TIME, GST_BUFFER_DTS (buf));
805 } else {
806 runpts = gst_segment_to_running_time (&trans->segment,
807 GST_FORMAT_TIME, GST_CLOCK_TIME_IS_VALID (buf->duration)
808 && GST_CLOCK_TIME_IS_VALID (buf->pts) ? buf->pts +
809 buf->duration : buf->pts);
810 rundts = gst_segment_to_running_time (&trans->segment,
811 GST_FORMAT_TIME, GST_CLOCK_TIME_IS_VALID (buf->duration)
812 && GST_CLOCK_TIME_IS_VALID (buf->dts) ? buf->dts +
813 buf->duration : buf->dts);
814 }
815 }
816
817 if (GST_CLOCK_TIME_IS_VALID (rundts))
818 runtimestamp = rundts;
819 else if (GST_CLOCK_TIME_IS_VALID (runpts))
820 runtimestamp = runpts;
821 else
822 runtimestamp = 0;
823 ret = gst_identity_do_sync (identity, runtimestamp);
824
825 identity->offset += size;
826
827 if (identity->sleep_time && ret == GST_FLOW_OK)
828 g_usleep (identity->sleep_time);
829
830 if (identity->single_segment && (trans->segment.format == GST_FORMAT_TIME)
831 && (ret == GST_FLOW_OK)) {
832 GST_BUFFER_DTS (buf) = rundts;
833 GST_BUFFER_PTS (buf) = runpts;
834 GST_BUFFER_OFFSET (buf) = GST_CLOCK_TIME_NONE;
835 GST_BUFFER_OFFSET_END (buf) = GST_CLOCK_TIME_NONE;
836 }
837
838 GST_OBJECT_LOCK (trans);
839 identity->num_bytes += gst_buffer_get_size (buf);
840 identity->num_buffers++;
841 GST_OBJECT_UNLOCK (trans);
842
843 return ret;
844
845 /* ERRORS */
846 error_after:
847 {
848 GST_ELEMENT_ERROR (identity, CORE, FAILED,
849 (_("Failed after iterations as requested.")), (NULL));
850 return GST_FLOW_ERROR;
851 }
852 eos_after:
853 {
854 GST_DEBUG_OBJECT (identity, "EOS after iterations as requested.");
855 return GST_FLOW_EOS;
856 }
857 dropped:
858 {
859 if (!identity->silent) {
860 gst_identity_update_last_message_for_buffer (identity, "dropping", buf,
861 size);
862 }
863
864 ts = GST_BUFFER_TIMESTAMP (buf);
865 if (GST_CLOCK_TIME_IS_VALID (ts)) {
866 duration = GST_BUFFER_DURATION (buf);
867 gst_pad_push_event (GST_BASE_TRANSFORM_SRC_PAD (identity),
868 gst_event_new_gap (ts, duration));
869 }
870
871 /* return DROPPED to basetransform. */
872 return GST_BASE_TRANSFORM_FLOW_DROPPED;
873 }
874 }
875
876 static void
gst_identity_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)877 gst_identity_set_property (GObject * object, guint prop_id,
878 const GValue * value, GParamSpec * pspec)
879 {
880 GstIdentity *identity;
881 GstMessage *clock_message = NULL;
882 gboolean sync;
883
884 identity = GST_IDENTITY (object);
885
886 switch (prop_id) {
887 case PROP_SLEEP_TIME:
888 identity->sleep_time = g_value_get_uint (value);
889 break;
890 case PROP_SILENT:
891 identity->silent = g_value_get_boolean (value);
892 break;
893 case PROP_SINGLE_SEGMENT:
894 identity->single_segment = g_value_get_boolean (value);
895 break;
896 case PROP_DUMP:
897 identity->dump = g_value_get_boolean (value);
898 break;
899 case PROP_ERROR_AFTER:
900 identity->error_after = g_value_get_int (value);
901 break;
902 case PROP_DROP_PROBABILITY:
903 identity->drop_probability = g_value_get_float (value);
904 break;
905 case PROP_DROP_BUFFER_FLAGS:
906 identity->drop_buffer_flags = g_value_get_flags (value);
907 break;
908 case PROP_DATARATE:
909 identity->datarate = g_value_get_int (value);
910 break;
911 case PROP_SYNC:
912 sync = g_value_get_boolean (value);
913 GST_OBJECT_LOCK (identity);
914 if (sync != identity->sync) {
915 identity->sync = sync;
916 if (sync) {
917 GST_OBJECT_FLAG_SET (identity, GST_ELEMENT_FLAG_PROVIDE_CLOCK);
918 clock_message =
919 gst_message_new_clock_provide (GST_OBJECT_CAST (identity),
920 gst_system_clock_obtain (), TRUE);
921 } else {
922 GST_OBJECT_FLAG_UNSET (identity, GST_ELEMENT_FLAG_PROVIDE_CLOCK);
923 clock_message =
924 gst_message_new_clock_lost (GST_OBJECT_CAST (identity),
925 gst_system_clock_obtain ());
926 }
927 }
928 GST_OBJECT_UNLOCK (identity);
929 if (clock_message)
930 gst_element_post_message (GST_ELEMENT_CAST (identity), clock_message);
931 break;
932 case PROP_TS_OFFSET:
933 identity->ts_offset = g_value_get_int64 (value);
934 break;
935 case PROP_CHECK_IMPERFECT_TIMESTAMP:
936 identity->check_imperfect_timestamp = g_value_get_boolean (value);
937 break;
938 case PROP_CHECK_IMPERFECT_OFFSET:
939 identity->check_imperfect_offset = g_value_get_boolean (value);
940 break;
941 case PROP_SIGNAL_HANDOFFS:
942 identity->signal_handoffs = g_value_get_boolean (value);
943 break;
944 case PROP_DROP_ALLOCATION:
945 identity->drop_allocation = g_value_get_boolean (value);
946 break;
947 case PROP_EOS_AFTER:
948 identity->eos_after = g_value_get_int (value);
949 break;
950 default:
951 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
952 break;
953 }
954 if (identity->datarate > 0 || identity->single_segment)
955 gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (identity), FALSE);
956 else
957 gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (identity), TRUE);
958 }
959
960 static GstStructure *
gst_identity_create_stats(GstIdentity * identity)961 gst_identity_create_stats (GstIdentity * identity)
962 {
963 GstStructure *s;
964
965 GST_OBJECT_LOCK (identity);
966 s = gst_structure_new ("application/x-identity-stats",
967 "num-bytes", G_TYPE_UINT64, identity->num_bytes,
968 "num-buffers", G_TYPE_UINT64, identity->num_buffers, NULL);
969 GST_OBJECT_UNLOCK (identity);
970
971 return s;
972 }
973
974 static void
gst_identity_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)975 gst_identity_get_property (GObject * object, guint prop_id, GValue * value,
976 GParamSpec * pspec)
977 {
978 GstIdentity *identity;
979
980 identity = GST_IDENTITY (object);
981
982 switch (prop_id) {
983 case PROP_SLEEP_TIME:
984 g_value_set_uint (value, identity->sleep_time);
985 break;
986 case PROP_ERROR_AFTER:
987 g_value_set_int (value, identity->error_after);
988 break;
989 case PROP_DROP_PROBABILITY:
990 g_value_set_float (value, identity->drop_probability);
991 break;
992 case PROP_DROP_BUFFER_FLAGS:
993 g_value_set_flags (value, identity->drop_buffer_flags);
994 break;
995 case PROP_DATARATE:
996 g_value_set_int (value, identity->datarate);
997 break;
998 case PROP_SILENT:
999 g_value_set_boolean (value, identity->silent);
1000 break;
1001 case PROP_SINGLE_SEGMENT:
1002 g_value_set_boolean (value, identity->single_segment);
1003 break;
1004 case PROP_DUMP:
1005 g_value_set_boolean (value, identity->dump);
1006 break;
1007 case PROP_LAST_MESSAGE:
1008 GST_OBJECT_LOCK (identity);
1009 g_value_set_string (value, identity->last_message);
1010 GST_OBJECT_UNLOCK (identity);
1011 break;
1012 case PROP_SYNC:
1013 g_value_set_boolean (value, identity->sync);
1014 break;
1015 case PROP_TS_OFFSET:
1016 g_value_set_int64 (value, identity->ts_offset);
1017 break;
1018 case PROP_CHECK_IMPERFECT_TIMESTAMP:
1019 g_value_set_boolean (value, identity->check_imperfect_timestamp);
1020 break;
1021 case PROP_CHECK_IMPERFECT_OFFSET:
1022 g_value_set_boolean (value, identity->check_imperfect_offset);
1023 break;
1024 case PROP_SIGNAL_HANDOFFS:
1025 g_value_set_boolean (value, identity->signal_handoffs);
1026 break;
1027 case PROP_DROP_ALLOCATION:
1028 g_value_set_boolean (value, identity->drop_allocation);
1029 break;
1030 case PROP_EOS_AFTER:
1031 g_value_set_int (value, identity->eos_after);
1032 break;
1033 case PROP_STATS:
1034 g_value_take_boxed (value, gst_identity_create_stats (identity));
1035 break;
1036 default:
1037 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1038 break;
1039 }
1040 }
1041
1042 static gboolean
gst_identity_start(GstBaseTransform * trans)1043 gst_identity_start (GstBaseTransform * trans)
1044 {
1045 GstIdentity *identity;
1046
1047 identity = GST_IDENTITY (trans);
1048
1049 if (identity->eos_after != DEFAULT_EOS_AFTER
1050 && identity->error_after != DEFAULT_ERROR_AFTER)
1051 goto both_afters_defined;
1052
1053 identity->offset = 0;
1054 identity->prev_timestamp = GST_CLOCK_TIME_NONE;
1055 identity->prev_duration = GST_CLOCK_TIME_NONE;
1056 identity->prev_offset_end = GST_BUFFER_OFFSET_NONE;
1057 identity->prev_offset = GST_BUFFER_OFFSET_NONE;
1058 identity->error_after_counter = identity->error_after;
1059 identity->eos_after_counter = identity->eos_after;
1060
1061 return TRUE;
1062
1063 /* ERROR */
1064 both_afters_defined:
1065 {
1066 GST_ELEMENT_ERROR (identity, CORE, FAILED,
1067 (_("eos-after and error-after can't both be defined.")), (NULL));
1068 return FALSE;
1069 }
1070 }
1071
1072 static gboolean
gst_identity_stop(GstBaseTransform * trans)1073 gst_identity_stop (GstBaseTransform * trans)
1074 {
1075 GstIdentity *identity;
1076
1077 identity = GST_IDENTITY (trans);
1078
1079 GST_OBJECT_LOCK (identity);
1080 g_free (identity->last_message);
1081 identity->last_message = NULL;
1082 GST_OBJECT_UNLOCK (identity);
1083
1084 return TRUE;
1085 }
1086
1087 static gboolean
gst_identity_accept_caps(GstBaseTransform * base,GstPadDirection direction,GstCaps * caps)1088 gst_identity_accept_caps (GstBaseTransform * base,
1089 GstPadDirection direction, GstCaps * caps)
1090 {
1091 gboolean ret;
1092 GstPad *pad;
1093
1094 /* Proxy accept-caps */
1095
1096 if (direction == GST_PAD_SRC)
1097 pad = GST_BASE_TRANSFORM_SINK_PAD (base);
1098 else
1099 pad = GST_BASE_TRANSFORM_SRC_PAD (base);
1100
1101 ret = gst_pad_peer_query_accept_caps (pad, caps);
1102
1103 return ret;
1104 }
1105
1106 static gboolean
gst_identity_query(GstBaseTransform * base,GstPadDirection direction,GstQuery * query)1107 gst_identity_query (GstBaseTransform * base, GstPadDirection direction,
1108 GstQuery * query)
1109 {
1110 GstIdentity *identity;
1111 gboolean ret;
1112
1113 identity = GST_IDENTITY (base);
1114
1115 if (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION &&
1116 identity->drop_allocation) {
1117 GST_DEBUG_OBJECT (identity, "Dropping allocation query.");
1118 return FALSE;
1119 }
1120
1121 ret = GST_BASE_TRANSFORM_CLASS (parent_class)->query (base, direction, query);
1122
1123 if (GST_QUERY_TYPE (query) == GST_QUERY_LATENCY) {
1124 gboolean live = FALSE;
1125 GstClockTime min = 0, max = 0;
1126
1127 if (ret) {
1128 gst_query_parse_latency (query, &live, &min, &max);
1129
1130 if (identity->sync && max < min) {
1131 GST_ELEMENT_WARNING (base, CORE, CLOCK, (NULL),
1132 ("Impossible to configure latency before identity sync=true:"
1133 " max %" GST_TIME_FORMAT " < min %"
1134 GST_TIME_FORMAT ". Add queues or other buffering elements.",
1135 GST_TIME_ARGS (max), GST_TIME_ARGS (min)));
1136 }
1137 }
1138
1139 /* Ignore the upstream latency if it is not live */
1140 GST_OBJECT_LOCK (identity);
1141 if (live)
1142 identity->upstream_latency = min;
1143 else {
1144 identity->upstream_latency = 0;
1145 /* if we interface a non-live source, then we know there is no
1146 * limit in the maximum latency */
1147 max = -1;
1148 }
1149 GST_OBJECT_UNLOCK (identity);
1150
1151 gst_query_set_latency (query, live || identity->sync, min, max);
1152 ret = TRUE;
1153 }
1154 return ret;
1155 }
1156
1157 static GstStateChangeReturn
gst_identity_change_state(GstElement * element,GstStateChange transition)1158 gst_identity_change_state (GstElement * element, GstStateChange transition)
1159 {
1160 GstStateChangeReturn ret;
1161 GstIdentity *identity = GST_IDENTITY (element);
1162 gboolean no_preroll = FALSE;
1163
1164 switch (transition) {
1165 case GST_STATE_CHANGE_NULL_TO_READY:
1166 break;
1167 case GST_STATE_CHANGE_READY_TO_PAUSED:
1168 GST_OBJECT_LOCK (identity);
1169 identity->flushing = FALSE;
1170 identity->blocked = TRUE;
1171 GST_OBJECT_UNLOCK (identity);
1172 if (identity->sync)
1173 no_preroll = TRUE;
1174 identity->num_bytes = 0;
1175 identity->num_buffers = 0;
1176 break;
1177 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
1178 GST_OBJECT_LOCK (identity);
1179 identity->blocked = FALSE;
1180 g_cond_signal (&identity->blocked_cond);
1181 GST_OBJECT_UNLOCK (identity);
1182 break;
1183 case GST_STATE_CHANGE_PAUSED_TO_READY:
1184 GST_OBJECT_LOCK (identity);
1185 identity->flushing = TRUE;
1186 if (identity->clock_id) {
1187 GST_DEBUG_OBJECT (identity, "unlock clock wait");
1188 gst_clock_id_unschedule (identity->clock_id);
1189 }
1190 identity->blocked = FALSE;
1191 g_cond_signal (&identity->blocked_cond);
1192 GST_OBJECT_UNLOCK (identity);
1193 break;
1194 default:
1195 break;
1196 }
1197
1198 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1199
1200 switch (transition) {
1201 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
1202 GST_OBJECT_LOCK (identity);
1203 identity->upstream_latency = 0;
1204 identity->blocked = TRUE;
1205 GST_OBJECT_UNLOCK (identity);
1206 if (identity->sync)
1207 no_preroll = TRUE;
1208 break;
1209 case GST_STATE_CHANGE_PAUSED_TO_READY:
1210 break;
1211 case GST_STATE_CHANGE_READY_TO_NULL:
1212 break;
1213 default:
1214 break;
1215 }
1216
1217 if (no_preroll && ret == GST_STATE_CHANGE_SUCCESS)
1218 ret = GST_STATE_CHANGE_NO_PREROLL;
1219
1220 return ret;
1221 }
1222
1223 /* FIXME: GStreamer 2.0 */
1224 static GstClock *
gst_identity_provide_clock(GstElement * element)1225 gst_identity_provide_clock (GstElement * element)
1226 {
1227 GstIdentity *identity = GST_IDENTITY (element);
1228
1229 if (!identity->sync)
1230 return NULL;
1231
1232 return gst_system_clock_obtain ();
1233 }
1234