2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2004,2005 Wim Taymans <wim@fluendo.com>
5 * gstpipeline.c: Overall pipeline management element
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
25 * @short_description: Top-level bin with clocking and bus management
27 * @see_also: #GstElement, #GstBin, #GstClock, #GstBus
29 * A #GstPipeline is a special #GstBin used as the toplevel container for
30 * the filter graph. The #GstPipeline will manage the selection and
31 * distribution of a global #GstClock as well as provide a #GstBus to the
32 * application. It will also implement a default behavour for managing
33 * seek events (see gst_element_seek()).
35 * gst_pipeline_new() is used to create a pipeline. when you are done with
36 * the pipeline, use gst_object_unref() to free its resources including all
37 * added #GstElement objects (if not otherwise referenced).
39 * Elements are added and removed from the pipeline using the #GstBin
40 * methods like gst_bin_add() and gst_bin_remove() (see #GstBin).
42 * Before changing the state of the #GstPipeline (see #GstElement) a #GstBus
43 * can be retrieved with gst_pipeline_get_bus(). This bus can then be
44 * used to receive #GstMessage from the elements in the pipeline.
46 * By default, a #GstPipeline will automatically flush the pending #GstBus
47 * messages when going to the NULL state to ensure that no circular
48 * references exist when no messages are read from the #GstBus. This
49 * behaviour can be changed with gst_pipeline_set_auto_flush_bus().
51 * When the #GstPipeline performs the PAUSED to PLAYING state change it will
52 * select a clock for the elements. The clock selection algorithm will by
53 * default select a clock provided by an element that is most upstream
54 * (closest to the source). For live pipelines (ones that return
55 * #GST_STATE_CHANGE_NO_PREROLL from the gst_element_set_state() call) this
56 * will select the clock provided by the live source. For normal pipelines
57 * this will select a clock provided by the sinks (most likely the audio
58 * sink). If no element provides a clock, a default #GstSystemClock is used.
60 * The clock selection can be controlled with the gst_pipeline_use_clock()
61 * method, which will enforce a given clock on the pipeline. With
62 * gst_pipeline_auto_clock() the default clock selection algorithm can be
65 * A #GstPipeline maintains a stream time for the elements. The stream
66 * time is defined as the difference between the current clock time and
67 * the base time. When the pipeline goes to READY or a flushing seek is
68 * performed on it, the stream time is reset to 0. When the pipeline is
69 * set from PLAYING to PAUSED, the current clock time is sampled and used to
70 * configure the base time for the elements when the pipeline is set
71 * to PLAYING again. This default behaviour can be changed with the
72 * gst_pipeline_set_new_stream_time() method.
74 * When sending a flushing seek event to a GstPipeline (see
75 * gst_element_seek()), it will make sure that the pipeline is properly
76 * PAUSED and resumed as well as set the new stream time to 0 when the
79 * Last reviewed on 2006-03-12 (0.10.5)
82 #include "gst_private.h"
84 #include "gst-i18n-lib.h"
86 #include "gstpipeline.h"
88 #include "gstsystemclock.h"
90 GST_DEBUG_CATEGORY_STATIC (pipeline_debug);
91 #define GST_CAT_DEFAULT pipeline_debug
93 static GstElementDetails gst_pipeline_details =
94 GST_ELEMENT_DETAILS ("Pipeline object",
96 "Complete pipeline object",
97 "Erik Walthinsen <omega@cse.ogi.edu>, Wim Taymans <wim@fluendo.com>");
99 /* Pipeline signals and args */
106 #define DEFAULT_DELAY 0
107 #define DEFAULT_AUTO_FLUSH_BUS TRUE
117 #define GST_PIPELINE_GET_PRIVATE(obj) \
118 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_PIPELINE, GstPipelinePrivate))
120 struct _GstPipelinePrivate
123 gboolean auto_flush_bus;
127 static void gst_pipeline_base_init (gpointer g_class);
128 static void gst_pipeline_class_init (gpointer g_class, gpointer class_data);
129 static void gst_pipeline_init (GTypeInstance * instance, gpointer g_class);
131 static void gst_pipeline_dispose (GObject * object);
132 static void gst_pipeline_set_property (GObject * object, guint prop_id,
133 const GValue * value, GParamSpec * pspec);
134 static void gst_pipeline_get_property (GObject * object, guint prop_id,
135 GValue * value, GParamSpec * pspec);
137 static gboolean gst_pipeline_send_event (GstElement * element,
140 static GstClock *gst_pipeline_provide_clock_func (GstElement * element);
141 static GstStateChangeReturn gst_pipeline_change_state (GstElement * element,
142 GstStateChange transition);
144 static GstBinClass *parent_class = NULL;
146 /* static guint gst_pipeline_signals[LAST_SIGNAL] = { 0 }; */
149 gst_pipeline_get_type (void)
151 static GType pipeline_type = 0;
153 if (G_UNLIKELY (pipeline_type == 0)) {
154 static const GTypeInfo pipeline_info = {
155 sizeof (GstPipelineClass),
156 gst_pipeline_base_init,
158 (GClassInitFunc) gst_pipeline_class_init,
161 sizeof (GstPipeline),
168 g_type_register_static (GST_TYPE_BIN, "GstPipeline", &pipeline_info, 0);
170 GST_DEBUG_CATEGORY_INIT (pipeline_debug, "pipeline", GST_DEBUG_BOLD,
171 "debugging info for the 'pipeline' container element");
173 return pipeline_type;
177 gst_pipeline_base_init (gpointer g_class)
179 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
181 gst_element_class_set_details (gstelement_class, &gst_pipeline_details);
185 gst_pipeline_class_init (gpointer g_class, gpointer class_data)
187 GObjectClass *gobject_class = G_OBJECT_CLASS (g_class);
188 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
189 GstPipelineClass *klass = GST_PIPELINE_CLASS (g_class);
191 parent_class = g_type_class_peek_parent (klass);
193 g_type_class_add_private (klass, sizeof (GstPipelinePrivate));
195 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_pipeline_set_property);
196 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_pipeline_get_property);
201 * The expected delay needed for elements to spin up to the
202 * PLAYING state expressed in nanoseconds.
203 * see gst_pipeline_set_delay() for more information on this option.
205 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DELAY,
206 g_param_spec_uint64 ("delay", "Delay",
207 "Expected delay needed for elements "
208 "to spin up to PLAYING in nanoseconds", 0, G_MAXUINT64, DEFAULT_DELAY,
212 * GstPipeline:auto-flush-bus:
214 * Whether or not to automatically flush all messages on the
215 * pipeline's bus when going from READY to NULL state. Please see
216 * gst_pipeline_set_auto_flush_bus() for more information on this option.
220 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_AUTO_FLUSH_BUS,
221 g_param_spec_boolean ("auto-flush-bus", "Auto Flush Bus",
222 "Whether to automatically flush the pipeline's bus when going "
223 "from READY into NULL state", DEFAULT_AUTO_FLUSH_BUS,
226 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pipeline_dispose);
228 gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_pipeline_send_event);
229 gstelement_class->change_state =
230 GST_DEBUG_FUNCPTR (gst_pipeline_change_state);
231 gstelement_class->provide_clock =
232 GST_DEBUG_FUNCPTR (gst_pipeline_provide_clock_func);
236 gst_pipeline_init (GTypeInstance * instance, gpointer g_class)
238 GstPipeline *pipeline = GST_PIPELINE (instance);
241 pipeline->priv = GST_PIPELINE_GET_PRIVATE (pipeline);
243 /* set default property values */
244 pipeline->priv->auto_flush_bus = DEFAULT_AUTO_FLUSH_BUS;
245 pipeline->delay = DEFAULT_DELAY;
247 /* create and set a default bus */
248 bus = gst_bus_new ();
249 gst_element_set_bus (GST_ELEMENT_CAST (pipeline), bus);
250 GST_DEBUG_OBJECT (pipeline, "set bus %" GST_PTR_FORMAT " on pipeline", bus);
251 gst_object_unref (bus);
255 gst_pipeline_dispose (GObject * object)
257 GstPipeline *pipeline = GST_PIPELINE (object);
259 GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pipeline, "dispose");
261 /* clear and unref any fixed clock */
262 gst_object_replace ((GstObject **) & pipeline->fixed_clock, NULL);
264 G_OBJECT_CLASS (parent_class)->dispose (object);
268 gst_pipeline_set_property (GObject * object, guint prop_id,
269 const GValue * value, GParamSpec * pspec)
271 GstPipeline *pipeline = GST_PIPELINE (object);
275 gst_pipeline_set_delay (pipeline, g_value_get_uint64 (value));
277 case PROP_AUTO_FLUSH_BUS:
278 gst_pipeline_set_auto_flush_bus (pipeline, g_value_get_boolean (value));
281 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
287 gst_pipeline_get_property (GObject * object, guint prop_id,
288 GValue * value, GParamSpec * pspec)
290 GstPipeline *pipeline = GST_PIPELINE (object);
294 g_value_set_uint64 (value, gst_pipeline_get_delay (pipeline));
296 case PROP_AUTO_FLUSH_BUS:
297 g_value_set_boolean (value, gst_pipeline_get_auto_flush_bus (pipeline));
300 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
305 /* default pipeline seeking code:
307 * If the pipeline is PLAYING and a flushing seek is done, set
308 * the pipeline to PAUSED before doing the seek.
310 * A flushing seek also resets the stream time to 0 so that when
311 * we go back to PLAYING after the seek, the base_time is recalculated
312 * and redistributed to the elements.
316 do_pipeline_seek (GstElement * element, GstEvent * event)
321 gboolean was_playing = FALSE;
324 /* we are only interested in the FLUSH flag of the seek event. */
325 gst_event_parse_seek (event, &rate, NULL, &flags, NULL, NULL, NULL, NULL);
327 flush = flags & GST_SEEK_FLAG_FLUSH;
329 /* if flushing seek, get the current state */
333 /* need to call _get_state() since a bin state is only updated
335 gst_element_get_state (element, &state, NULL, 0);
336 was_playing = state == GST_STATE_PLAYING;
339 /* and PAUSE when the pipeline was PLAYING, we don't need
340 * to wait for the state change to complete since we are going
341 * to flush out any preroll sample anyway */
342 gst_element_set_state (element, GST_STATE_PAUSED);
346 /* let parent class implement the seek behaviour */
347 res = GST_ELEMENT_CLASS (parent_class)->send_event (element, event);
349 /* if flushing seek restore previous state */
353 GST_OBJECT_LOCK (element);
354 need_reset = GST_PIPELINE (element)->stream_time != GST_CLOCK_TIME_NONE;
355 GST_OBJECT_UNLOCK (element);
357 /* need to reset the stream time to 0 after a successfull flushing seek,
358 * unless the user explicitly disabled this behavior by setting stream
360 if (need_reset && res)
361 gst_pipeline_set_new_stream_time (GST_PIPELINE (element), 0);
364 /* and continue playing, this might return ASYNC in which case the
365 * application can wait for the PREROLL to complete after the seek.
367 gst_element_set_state (element, GST_STATE_PLAYING);
373 gst_pipeline_send_event (GstElement * element, GstEvent * event)
376 GstEventType event_type = GST_EVENT_TYPE (event);
378 switch (event_type) {
380 /* do the default seek handling */
381 res = do_pipeline_seek (element, event);
384 /* else parent implements the defaults */
385 res = GST_ELEMENT_CLASS (parent_class)->send_event (element, event);
394 * @name: name of new pipeline
396 * Create a new pipeline with the given name.
398 * Returns: newly created GstPipeline
403 gst_pipeline_new (const gchar * name)
405 return gst_element_factory_make ("pipeline", name);
409 static GstStateChangeReturn
410 gst_pipeline_change_state (GstElement * element, GstStateChange transition)
412 GstStateChangeReturn result = GST_STATE_CHANGE_SUCCESS;
413 GstPipeline *pipeline = GST_PIPELINE (element);
416 switch (transition) {
417 case GST_STATE_CHANGE_NULL_TO_READY:
418 GST_OBJECT_LOCK (element);
420 gst_bus_set_flushing (element->bus, FALSE);
421 GST_OBJECT_UNLOCK (element);
423 case GST_STATE_CHANGE_READY_TO_PAUSED:
425 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
427 GstClockTime new_base_time;
429 /* when going to playing, select a clock */
430 clock = gst_element_provide_clock (element);
433 GstClockTime start_time, stream_time, delay;
436 start_time = gst_clock_get_time (clock);
438 GST_OBJECT_LOCK (element);
439 new_clock = element->clock != clock;
440 stream_time = pipeline->stream_time;
441 delay = pipeline->delay;
442 GST_OBJECT_UNLOCK (element);
445 /* now distribute the clock (which could be NULL). If some
446 * element refuses the clock, this will return FALSE and
447 * we effectively fail the state change. */
448 if (!gst_element_set_clock (element, clock))
451 /* if we selected and distributed a new clock, let the app
453 gst_element_post_message (element,
454 gst_message_new_new_clock (GST_OBJECT_CAST (element), clock));
457 if (stream_time != GST_CLOCK_TIME_NONE)
458 new_base_time = start_time - stream_time + delay;
460 new_base_time = GST_CLOCK_TIME_NONE;
462 gst_object_unref (clock);
464 GST_DEBUG ("no clock, using base time of 0");
468 if (new_base_time != GST_CLOCK_TIME_NONE)
469 gst_element_set_base_time (element, new_base_time);
471 GST_DEBUG_OBJECT (pipeline,
472 "NOT adjusting base time because stream time is NONE");
475 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
477 case GST_STATE_CHANGE_PAUSED_TO_READY:
478 case GST_STATE_CHANGE_READY_TO_NULL:
482 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
484 switch (transition) {
485 case GST_STATE_CHANGE_NULL_TO_READY:
487 case GST_STATE_CHANGE_READY_TO_PAUSED:
491 /* only reset the stream time when the application did not
492 * specify a stream time explicitly */
493 GST_OBJECT_LOCK (element);
494 need_reset = pipeline->stream_time != GST_CLOCK_TIME_NONE;
495 GST_OBJECT_UNLOCK (element);
498 gst_pipeline_set_new_stream_time (pipeline, 0);
501 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
503 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
504 GST_OBJECT_LOCK (element);
505 if ((clock = element->clock)) {
508 gst_object_ref (clock);
509 GST_OBJECT_UNLOCK (element);
511 /* calculate the time when we stopped */
512 now = gst_clock_get_time (clock);
513 gst_object_unref (clock);
515 GST_OBJECT_LOCK (element);
516 /* store the current stream time */
517 if (pipeline->stream_time != GST_CLOCK_TIME_NONE)
518 pipeline->stream_time = now - element->base_time;
519 GST_DEBUG_OBJECT (element,
520 "stream_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
521 ", base time %" GST_TIME_FORMAT,
522 GST_TIME_ARGS (pipeline->stream_time), GST_TIME_ARGS (now),
523 GST_TIME_ARGS (element->base_time));
525 GST_OBJECT_UNLOCK (element);
527 case GST_STATE_CHANGE_PAUSED_TO_READY:
529 case GST_STATE_CHANGE_READY_TO_NULL:
530 GST_OBJECT_LOCK (element);
532 if (pipeline->priv->auto_flush_bus) {
533 gst_bus_set_flushing (element->bus, TRUE);
535 GST_INFO_OBJECT (element, "not flushing bus, auto-flushing disabled");
538 GST_OBJECT_UNLOCK (element);
546 /* we generate this error when the selected clock was not
547 * accepted by some element */
548 GST_ELEMENT_ERROR (pipeline, CORE, CLOCK,
549 (_("Selected clock cannot be used in pipeline.")),
550 ("Pipeline cannot operate with selected clock"));
551 GST_DEBUG_OBJECT (pipeline,
552 "Pipeline cannot operate with selected clock %p", clock);
553 return GST_STATE_CHANGE_FAILURE;
558 * gst_pipeline_get_bus:
559 * @pipeline: a #GstPipeline
561 * Gets the #GstBus of @pipeline.
563 * Returns: a #GstBus, unref after usage.
568 gst_pipeline_get_bus (GstPipeline * pipeline)
570 return gst_element_get_bus (GST_ELEMENT (pipeline));
574 * gst_pipeline_set_new_stream_time:
575 * @pipeline: a #GstPipeline
576 * @time: the new stream time to set
578 * Set the new stream time of @pipeline to @time. The stream time is used to
579 * set the base time on the elements (see gst_element_set_base_time())
580 * in the PAUSED->PLAYING state transition.
582 * Setting @time to #GST_CLOCK_TIME_NONE will disable the pipeline's management
583 * of element base time. The application will then be responsible for
584 * performing base time distribution. This is sometimes useful if you want to
585 * synchronize capture from multiple pipelines, and you can also ensure that the
586 * pipelines have the same clock.
591 gst_pipeline_set_new_stream_time (GstPipeline * pipeline, GstClockTime time)
593 g_return_if_fail (GST_IS_PIPELINE (pipeline));
595 GST_OBJECT_LOCK (pipeline);
596 pipeline->stream_time = time;
597 GST_OBJECT_UNLOCK (pipeline);
599 GST_DEBUG_OBJECT (pipeline, "set new stream_time to %" GST_TIME_FORMAT,
600 GST_TIME_ARGS (time));
602 if (time == GST_CLOCK_TIME_NONE)
603 GST_DEBUG_OBJECT (pipeline, "told not to adjust base time");
607 * gst_pipeline_get_last_stream_time:
608 * @pipeline: a #GstPipeline
610 * Gets the last stream time of @pipeline. If the pipeline is PLAYING,
611 * the returned time is the stream time used to configure the element's
612 * base time in the PAUSED->PLAYING state. If the pipeline is PAUSED, the
613 * returned time is the stream time when the pipeline was paused.
615 * This function returns #GST_CLOCK_TIME_NONE if the pipeline was
616 * configured to not handle the management of the element's base time
617 * (see gst_pipeline_set_new_stream_time()).
619 * Returns: a #GstClockTime.
624 gst_pipeline_get_last_stream_time (GstPipeline * pipeline)
628 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
630 GST_OBJECT_LOCK (pipeline);
631 result = pipeline->stream_time;
632 GST_OBJECT_UNLOCK (pipeline);
638 gst_pipeline_provide_clock_func (GstElement * element)
640 GstClock *clock = NULL;
641 GstPipeline *pipeline = GST_PIPELINE (element);
643 /* if we have a fixed clock, use that one */
644 GST_OBJECT_LOCK (pipeline);
645 if (GST_OBJECT_FLAG_IS_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK)) {
646 clock = pipeline->fixed_clock;
647 gst_object_ref (clock);
648 GST_OBJECT_UNLOCK (pipeline);
650 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)",
651 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
653 GST_OBJECT_UNLOCK (pipeline);
654 /* let the parent bin select a clock */
656 GST_ELEMENT_CLASS (parent_class)->
657 provide_clock (GST_ELEMENT (pipeline));
658 /* no clock, use a system clock */
660 clock = gst_system_clock_obtain ();
662 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained system clock: %p (%s)",
663 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
665 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained clock: %p (%s)",
666 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
673 * gst_pipeline_get_clock:
674 * @pipeline: a #GstPipeline
676 * Gets the current clock used by @pipeline.
678 * Returns: a #GstClock, unref after usage.
681 gst_pipeline_get_clock (GstPipeline * pipeline)
683 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), NULL);
685 return gst_pipeline_provide_clock_func (GST_ELEMENT (pipeline));
690 * gst_pipeline_use_clock:
691 * @pipeline: a #GstPipeline
692 * @clock: the clock to use
694 * Force @pipeline to use the given @clock. The pipeline will
695 * always use the given clock even if new clock providers are added
698 * If @clock is NULL all clocking will be disabled which will make
699 * the pipeline run as fast as possible.
704 gst_pipeline_use_clock (GstPipeline * pipeline, GstClock * clock)
706 g_return_if_fail (GST_IS_PIPELINE (pipeline));
708 GST_OBJECT_LOCK (pipeline);
709 GST_OBJECT_FLAG_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
711 gst_object_replace ((GstObject **) & pipeline->fixed_clock,
712 (GstObject *) clock);
713 GST_OBJECT_UNLOCK (pipeline);
715 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)", clock,
716 (clock ? GST_OBJECT_NAME (clock) : "nil"));
720 * gst_pipeline_set_clock:
721 * @pipeline: a #GstPipeline
722 * @clock: the clock to set
724 * Set the clock for @pipeline. The clock will be distributed
725 * to all the elements managed by the pipeline.
727 * Returns: TRUE if the clock could be set on the pipeline. FALSE if
728 * some element did not accept the clock.
733 gst_pipeline_set_clock (GstPipeline * pipeline, GstClock * clock)
735 g_return_val_if_fail (pipeline != NULL, FALSE);
736 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), FALSE);
738 return GST_ELEMENT_CLASS (parent_class)->set_clock (GST_ELEMENT (pipeline),
743 * gst_pipeline_auto_clock:
744 * @pipeline: a #GstPipeline
746 * Let @pipeline select a clock automatically. This is the default
749 * Use this function if you previous forced a fixed clock with
750 * gst_pipeline_use_clock() and want to restore the default
751 * pipeline clock selection algorithm.
756 gst_pipeline_auto_clock (GstPipeline * pipeline)
758 g_return_if_fail (pipeline != NULL);
759 g_return_if_fail (GST_IS_PIPELINE (pipeline));
761 GST_OBJECT_LOCK (pipeline);
762 GST_OBJECT_FLAG_UNSET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
764 gst_object_replace ((GstObject **) & pipeline->fixed_clock, NULL);
765 GST_OBJECT_UNLOCK (pipeline);
767 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using automatic clock");
771 * gst_pipeline_set_delay:
772 * @pipeline: a #GstPipeline
775 * Set the expected delay needed for all elements to perform the
776 * PAUSED to PLAYING state change. @delay will be added to the
777 * base time of the elements so that they wait an additional @delay
778 * amount of time before starting to process buffers.
780 * This option is used for tuning purposes and should normally not be
788 gst_pipeline_set_delay (GstPipeline * pipeline, GstClockTime delay)
790 g_return_if_fail (GST_IS_PIPELINE (pipeline));
792 GST_OBJECT_LOCK (pipeline);
793 pipeline->delay = delay;
794 GST_OBJECT_UNLOCK (pipeline);
798 * gst_pipeline_get_delay:
799 * @pipeline: a #GstPipeline
801 * Get the configured delay (see gst_pipeline_set_delay()).
803 * Returns: The configured delay.
810 gst_pipeline_get_delay (GstPipeline * pipeline)
814 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
816 GST_OBJECT_LOCK (pipeline);
817 res = pipeline->delay;
818 GST_OBJECT_UNLOCK (pipeline);
824 * gst_pipeline_set_auto_flush_bus:
825 * @pipeline: a #GstPipeline
826 * @auto_flush: whether or not to automatically flush the bus when
827 * the pipeline goes from READY to NULL state
829 * Usually, when a pipeline goes from READY to NULL state, it automatically
830 * flushes all pending messages on the bus, which is done for refcounting
831 * purposes, to break circular references.
833 * This means that applications that update state using (async) bus messages
834 * (e.g. do certain things when a pipeline goes from PAUSED to READY) might
835 * not get to see messages when the pipeline is shut down, because they might
836 * be flushed before they can be dispatched in the main thread. This behaviour
837 * can be disabled using this function.
839 * It is important that all messages on the bus are handled when the
840 * automatic flushing is disabled else memory leaks will be introduced.
847 gst_pipeline_set_auto_flush_bus (GstPipeline * pipeline, gboolean auto_flush)
849 g_return_if_fail (GST_IS_PIPELINE (pipeline));
851 GST_OBJECT_LOCK (pipeline);
852 pipeline->priv->auto_flush_bus = auto_flush;
853 GST_OBJECT_UNLOCK (pipeline);
857 * gst_pipeline_get_auto_flush_bus:
858 * @pipeline: a #GstPipeline
860 * Check if @pipeline will automatically flush messages when going to
863 * Returns: whether the pipeline will automatically flush its bus when
864 * going from READY to NULL state or not.
871 gst_pipeline_get_auto_flush_bus (GstPipeline * pipeline)
875 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), FALSE);
877 GST_OBJECT_LOCK (pipeline);
878 res = pipeline->priv->auto_flush_bus;
879 GST_OBJECT_UNLOCK (pipeline);