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.
207 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DELAY,
208 g_param_spec_uint64 ("delay", "Delay",
209 "Expected delay needed for elements "
210 "to spin up to PLAYING in nanoseconds", 0, G_MAXUINT64, DEFAULT_DELAY,
214 * GstPipeline:auto-flush-bus:
216 * Whether or not to automatically flush all messages on the
217 * pipeline's bus when going from READY to NULL state. Please see
218 * gst_pipeline_set_auto_flush_bus() for more information on this option.
222 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_AUTO_FLUSH_BUS,
223 g_param_spec_boolean ("auto-flush-bus", "Auto Flush Bus",
224 "Whether to automatically flush the pipeline's bus when going "
225 "from READY into NULL state", DEFAULT_AUTO_FLUSH_BUS,
228 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pipeline_dispose);
230 gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_pipeline_send_event);
231 gstelement_class->change_state =
232 GST_DEBUG_FUNCPTR (gst_pipeline_change_state);
233 gstelement_class->provide_clock =
234 GST_DEBUG_FUNCPTR (gst_pipeline_provide_clock_func);
238 gst_pipeline_init (GTypeInstance * instance, gpointer g_class)
240 GstPipeline *pipeline = GST_PIPELINE (instance);
243 pipeline->priv = GST_PIPELINE_GET_PRIVATE (pipeline);
245 /* set default property values */
246 pipeline->priv->auto_flush_bus = DEFAULT_AUTO_FLUSH_BUS;
247 pipeline->delay = DEFAULT_DELAY;
249 /* create and set a default bus */
250 bus = gst_bus_new ();
252 /* FIXME, disabled for 0.10.5 release as it caused to many regressions */
253 /* Start our bus in flushing if appropriate */
254 if (pipeline->priv->auto_flush_bus)
255 gst_bus_set_flushing (bus, TRUE);
258 gst_element_set_bus (GST_ELEMENT_CAST (pipeline), bus);
259 GST_DEBUG_OBJECT (pipeline, "set bus %" GST_PTR_FORMAT " on pipeline", bus);
260 gst_object_unref (bus);
264 gst_pipeline_dispose (GObject * object)
266 GstPipeline *pipeline = GST_PIPELINE (object);
267 GstClock **clock_p = &pipeline->fixed_clock;
269 GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pipeline, "dispose");
271 /* clear and unref any fixed clock */
272 gst_object_replace ((GstObject **) clock_p, NULL);
274 G_OBJECT_CLASS (parent_class)->dispose (object);
278 gst_pipeline_set_property (GObject * object, guint prop_id,
279 const GValue * value, GParamSpec * pspec)
281 GstPipeline *pipeline = GST_PIPELINE (object);
285 gst_pipeline_set_delay (pipeline, g_value_get_uint64 (value));
287 case PROP_AUTO_FLUSH_BUS:
288 gst_pipeline_set_auto_flush_bus (pipeline, g_value_get_boolean (value));
291 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
297 gst_pipeline_get_property (GObject * object, guint prop_id,
298 GValue * value, GParamSpec * pspec)
300 GstPipeline *pipeline = GST_PIPELINE (object);
304 g_value_set_uint64 (value, gst_pipeline_get_delay (pipeline));
306 case PROP_AUTO_FLUSH_BUS:
307 g_value_set_boolean (value, gst_pipeline_get_auto_flush_bus (pipeline));
310 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
315 /* default pipeline seeking code:
317 * If the pipeline is PLAYING and a flushing seek is done, set
318 * the pipeline to PAUSED before doing the seek.
320 * A flushing seek also resets the stream time to 0 so that when
321 * we go back to PLAYING after the seek, the base_time is recalculated
322 * and redistributed to the elements.
326 do_pipeline_seek (GstElement * element, GstEvent * event)
331 gboolean was_playing = FALSE;
334 /* we are only interested in the FLUSH flag of the seek event. */
335 gst_event_parse_seek (event, &rate, NULL, &flags, NULL, NULL, NULL, NULL);
337 flush = flags & GST_SEEK_FLAG_FLUSH;
339 /* if flushing seek, get the current state */
343 /* need to call _get_state() since a bin state is only updated
345 gst_element_get_state (element, &state, NULL, 0);
346 was_playing = state == GST_STATE_PLAYING;
349 /* and PAUSE when the pipeline was PLAYING, we don't need
350 * to wait for the state change to complete since we are going
351 * to flush out any preroll sample anyway */
352 gst_element_set_state (element, GST_STATE_PAUSED);
356 /* let parent class implement the seek behaviour */
357 res = GST_ELEMENT_CLASS (parent_class)->send_event (element, event);
359 /* if flushing seek restore previous state */
363 GST_OBJECT_LOCK (element);
364 need_reset = GST_PIPELINE (element)->stream_time != GST_CLOCK_TIME_NONE;
365 GST_OBJECT_UNLOCK (element);
367 /* need to reset the stream time to 0 after a successfull flushing seek,
368 * unless the user explicitly disabled this behavior by setting stream
370 if (need_reset && res)
371 gst_pipeline_set_new_stream_time (GST_PIPELINE (element), 0);
374 /* and continue playing, this might return ASYNC in which case the
375 * application can wait for the PREROLL to complete after the seek.
377 gst_element_set_state (element, GST_STATE_PLAYING);
383 gst_pipeline_send_event (GstElement * element, GstEvent * event)
386 GstEventType event_type = GST_EVENT_TYPE (event);
388 switch (event_type) {
390 /* do the default seek handling */
391 res = do_pipeline_seek (element, event);
394 /* else parent implements the defaults */
395 res = GST_ELEMENT_CLASS (parent_class)->send_event (element, event);
404 * @name: name of new pipeline
406 * Create a new pipeline with the given name.
408 * Returns: newly created GstPipeline
413 gst_pipeline_new (const gchar * name)
415 return gst_element_factory_make ("pipeline", name);
419 static GstStateChangeReturn
420 gst_pipeline_change_state (GstElement * element, GstStateChange transition)
422 GstStateChangeReturn result = GST_STATE_CHANGE_SUCCESS;
423 GstPipeline *pipeline = GST_PIPELINE (element);
426 switch (transition) {
427 case GST_STATE_CHANGE_NULL_TO_READY:
428 GST_OBJECT_LOCK (element);
430 gst_bus_set_flushing (element->bus, FALSE);
431 GST_OBJECT_UNLOCK (element);
433 case GST_STATE_CHANGE_READY_TO_PAUSED:
435 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
437 GstClockTime new_base_time;
439 /* when going to playing, select a clock */
440 clock = gst_element_provide_clock (element);
443 GstClockTime start_time, stream_time, delay;
446 start_time = gst_clock_get_time (clock);
448 GST_OBJECT_LOCK (element);
449 new_clock = element->clock != clock;
450 stream_time = pipeline->stream_time;
451 delay = pipeline->delay;
452 GST_OBJECT_UNLOCK (element);
455 /* now distribute the clock (which could be NULL). If some
456 * element refuses the clock, this will return FALSE and
457 * we effectively fail the state change. */
458 if (!gst_element_set_clock (element, clock))
461 /* if we selected and distributed a new clock, let the app
463 gst_element_post_message (element,
464 gst_message_new_new_clock (GST_OBJECT_CAST (element), clock));
467 if (stream_time != GST_CLOCK_TIME_NONE)
468 new_base_time = start_time - stream_time + delay;
470 new_base_time = GST_CLOCK_TIME_NONE;
472 gst_object_unref (clock);
474 GST_DEBUG ("no clock, using base time of 0");
478 if (new_base_time != GST_CLOCK_TIME_NONE)
479 gst_element_set_base_time (element, new_base_time);
481 GST_DEBUG_OBJECT (pipeline,
482 "NOT adjusting base time because stream time is NONE");
485 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
487 case GST_STATE_CHANGE_PAUSED_TO_READY:
488 case GST_STATE_CHANGE_READY_TO_NULL:
492 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
494 switch (transition) {
495 case GST_STATE_CHANGE_NULL_TO_READY:
497 case GST_STATE_CHANGE_READY_TO_PAUSED:
501 /* only reset the stream time when the application did not
502 * specify a stream time explicitly */
503 GST_OBJECT_LOCK (element);
504 need_reset = pipeline->stream_time != GST_CLOCK_TIME_NONE;
505 GST_OBJECT_UNLOCK (element);
508 gst_pipeline_set_new_stream_time (pipeline, 0);
511 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
513 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
514 GST_OBJECT_LOCK (element);
515 if ((clock = element->clock)) {
518 gst_object_ref (clock);
519 GST_OBJECT_UNLOCK (element);
521 /* calculate the time when we stopped */
522 now = gst_clock_get_time (clock);
523 gst_object_unref (clock);
525 GST_OBJECT_LOCK (element);
526 /* store the current stream time */
527 if (pipeline->stream_time != GST_CLOCK_TIME_NONE)
528 pipeline->stream_time = now - element->base_time;
529 GST_DEBUG_OBJECT (element,
530 "stream_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
531 ", base time %" GST_TIME_FORMAT,
532 GST_TIME_ARGS (pipeline->stream_time), GST_TIME_ARGS (now),
533 GST_TIME_ARGS (element->base_time));
535 GST_OBJECT_UNLOCK (element);
537 case GST_STATE_CHANGE_PAUSED_TO_READY:
539 case GST_STATE_CHANGE_READY_TO_NULL:
540 GST_OBJECT_LOCK (element);
542 if (pipeline->priv->auto_flush_bus) {
543 gst_bus_set_flushing (element->bus, TRUE);
545 GST_INFO_OBJECT (element, "not flushing bus, auto-flushing disabled");
548 GST_OBJECT_UNLOCK (element);
556 /* we generate this error when the selected clock was not
557 * accepted by some element */
558 GST_ELEMENT_ERROR (pipeline, CORE, CLOCK,
559 (_("Selected clock cannot be used in pipeline.")),
560 ("Pipeline cannot operate with selected clock"));
561 GST_DEBUG_OBJECT (pipeline,
562 "Pipeline cannot operate with selected clock %p", clock);
563 return GST_STATE_CHANGE_FAILURE;
568 * gst_pipeline_get_bus:
569 * @pipeline: a #GstPipeline
571 * Gets the #GstBus of @pipeline.
573 * Returns: a #GstBus, unref after usage.
578 gst_pipeline_get_bus (GstPipeline * pipeline)
580 return gst_element_get_bus (GST_ELEMENT (pipeline));
584 * gst_pipeline_set_new_stream_time:
585 * @pipeline: a #GstPipeline
586 * @time: the new stream time to set
588 * Set the new stream time of @pipeline to @time. The stream time is used to
589 * set the base time on the elements (see gst_element_set_base_time())
590 * in the PAUSED->PLAYING state transition.
592 * Setting @time to #GST_CLOCK_TIME_NONE will disable the pipeline's management
593 * of element base time. The application will then be responsible for
594 * performing base time distribution. This is sometimes useful if you want to
595 * synchronize capture from multiple pipelines, and you can also ensure that the
596 * pipelines have the same clock.
601 gst_pipeline_set_new_stream_time (GstPipeline * pipeline, GstClockTime time)
603 g_return_if_fail (GST_IS_PIPELINE (pipeline));
605 GST_OBJECT_LOCK (pipeline);
606 pipeline->stream_time = time;
607 GST_OBJECT_UNLOCK (pipeline);
609 GST_DEBUG_OBJECT (pipeline, "set new stream_time to %" GST_TIME_FORMAT,
610 GST_TIME_ARGS (time));
612 if (time == GST_CLOCK_TIME_NONE)
613 GST_DEBUG_OBJECT (pipeline, "told not to adjust base time");
617 * gst_pipeline_get_last_stream_time:
618 * @pipeline: a #GstPipeline
620 * Gets the last stream time of @pipeline. If the pipeline is PLAYING,
621 * the returned time is the stream time used to configure the element's
622 * base time in the PAUSED->PLAYING state. If the pipeline is PAUSED, the
623 * returned time is the stream time when the pipeline was paused.
625 * This function returns #GST_CLOCK_TIME_NONE if the pipeline was
626 * configured to not handle the management of the element's base time
627 * (see gst_pipeline_set_new_stream_time()).
629 * Returns: a #GstClockTime.
634 gst_pipeline_get_last_stream_time (GstPipeline * pipeline)
638 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
640 GST_OBJECT_LOCK (pipeline);
641 result = pipeline->stream_time;
642 GST_OBJECT_UNLOCK (pipeline);
648 gst_pipeline_provide_clock_func (GstElement * element)
650 GstClock *clock = NULL;
651 GstPipeline *pipeline = GST_PIPELINE (element);
653 /* if we have a fixed clock, use that one */
654 GST_OBJECT_LOCK (pipeline);
655 if (GST_OBJECT_FLAG_IS_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK)) {
656 clock = pipeline->fixed_clock;
657 gst_object_ref (clock);
658 GST_OBJECT_UNLOCK (pipeline);
660 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)",
661 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
663 GST_OBJECT_UNLOCK (pipeline);
664 /* let the parent bin select a clock */
666 GST_ELEMENT_CLASS (parent_class)->
667 provide_clock (GST_ELEMENT (pipeline));
668 /* no clock, use a system clock */
670 clock = gst_system_clock_obtain ();
672 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained system clock: %p (%s)",
673 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
675 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained clock: %p (%s)",
676 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
683 * gst_pipeline_get_clock:
684 * @pipeline: a #GstPipeline
686 * Gets the current clock used by @pipeline.
688 * Returns: a #GstClock, unref after usage.
691 gst_pipeline_get_clock (GstPipeline * pipeline)
693 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), NULL);
695 return gst_pipeline_provide_clock_func (GST_ELEMENT (pipeline));
700 * gst_pipeline_use_clock:
701 * @pipeline: a #GstPipeline
702 * @clock: the clock to use
704 * Force @pipeline to use the given @clock. The pipeline will
705 * always use the given clock even if new clock providers are added
708 * If @clock is NULL all clocking will be disabled which will make
709 * the pipeline run as fast as possible.
714 gst_pipeline_use_clock (GstPipeline * pipeline, GstClock * clock)
718 g_return_if_fail (GST_IS_PIPELINE (pipeline));
720 GST_OBJECT_LOCK (pipeline);
721 GST_OBJECT_FLAG_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
723 clock_p = &pipeline->fixed_clock;
724 gst_object_replace ((GstObject **) clock_p, (GstObject *) clock);
725 GST_OBJECT_UNLOCK (pipeline);
727 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)", clock,
728 (clock ? GST_OBJECT_NAME (clock) : "nil"));
732 * gst_pipeline_set_clock:
733 * @pipeline: a #GstPipeline
734 * @clock: the clock to set
736 * Set the clock for @pipeline. The clock will be distributed
737 * to all the elements managed by the pipeline.
739 * Returns: TRUE if the clock could be set on the pipeline. FALSE if
740 * some element did not accept the clock.
745 gst_pipeline_set_clock (GstPipeline * pipeline, GstClock * clock)
747 g_return_val_if_fail (pipeline != NULL, FALSE);
748 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), FALSE);
750 return GST_ELEMENT_CLASS (parent_class)->set_clock (GST_ELEMENT (pipeline),
755 * gst_pipeline_auto_clock:
756 * @pipeline: a #GstPipeline
758 * Let @pipeline select a clock automatically. This is the default
761 * Use this function if you previous forced a fixed clock with
762 * gst_pipeline_use_clock() and want to restore the default
763 * pipeline clock selection algorithm.
768 gst_pipeline_auto_clock (GstPipeline * pipeline)
772 g_return_if_fail (pipeline != NULL);
773 g_return_if_fail (GST_IS_PIPELINE (pipeline));
775 GST_OBJECT_LOCK (pipeline);
776 GST_OBJECT_FLAG_UNSET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
778 clock_p = &pipeline->fixed_clock;
779 gst_object_replace ((GstObject **) clock_p, NULL);
780 GST_OBJECT_UNLOCK (pipeline);
782 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using automatic clock");
786 * gst_pipeline_set_delay:
787 * @pipeline: a #GstPipeline
790 * Set the expected delay needed for all elements to perform the
791 * PAUSED to PLAYING state change. @delay will be added to the
792 * base time of the elements so that they wait an additional @delay
793 * amount of time before starting to process buffers.
795 * This option is used for tuning purposes and should normally not be
803 gst_pipeline_set_delay (GstPipeline * pipeline, GstClockTime delay)
805 g_return_if_fail (GST_IS_PIPELINE (pipeline));
807 GST_OBJECT_LOCK (pipeline);
808 pipeline->delay = delay;
809 GST_OBJECT_UNLOCK (pipeline);
813 * gst_pipeline_get_delay:
814 * @pipeline: a #GstPipeline
816 * Get the configured delay (see gst_pipeline_set_delay()).
818 * Returns: The configured delay.
825 gst_pipeline_get_delay (GstPipeline * pipeline)
829 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
831 GST_OBJECT_LOCK (pipeline);
832 res = pipeline->delay;
833 GST_OBJECT_UNLOCK (pipeline);
839 * gst_pipeline_set_auto_flush_bus:
840 * @pipeline: a #GstPipeline
841 * @auto_flush: whether or not to automatically flush the bus when
842 * the pipeline goes from READY to NULL state
844 * Usually, when a pipeline goes from READY to NULL state, it automatically
845 * flushes all pending messages on the bus, which is done for refcounting
846 * purposes, to break circular references.
848 * This means that applications that update state using (async) bus messages
849 * (e.g. do certain things when a pipeline goes from PAUSED to READY) might
850 * not get to see messages when the pipeline is shut down, because they might
851 * be flushed before they can be dispatched in the main thread. This behaviour
852 * can be disabled using this function.
854 * It is important that all messages on the bus are handled when the
855 * automatic flushing is disabled else memory leaks will be introduced.
862 gst_pipeline_set_auto_flush_bus (GstPipeline * pipeline, gboolean auto_flush)
864 g_return_if_fail (GST_IS_PIPELINE (pipeline));
866 GST_OBJECT_LOCK (pipeline);
867 pipeline->priv->auto_flush_bus = auto_flush;
868 GST_OBJECT_UNLOCK (pipeline);
872 * gst_pipeline_get_auto_flush_bus:
873 * @pipeline: a #GstPipeline
875 * Check if @pipeline will automatically flush messages when going to
878 * Returns: whether the pipeline will automatically flush its bus when
879 * going from READY to NULL state or not.
886 gst_pipeline_get_auto_flush_bus (GstPipeline * pipeline)
890 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), FALSE);
892 GST_OBJECT_LOCK (pipeline);
893 res = pipeline->priv->auto_flush_bus;
894 GST_OBJECT_UNLOCK (pipeline);