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 const 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
116 #define GST_PIPELINE_GET_PRIVATE(obj) \
117 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_PIPELINE, GstPipelinePrivate))
119 struct _GstPipelinePrivate
122 gboolean auto_flush_bus;
124 GstClockTime new_stream_time;
128 static void gst_pipeline_base_init (gpointer g_class);
129 static void gst_pipeline_class_init (gpointer g_class, gpointer class_data);
130 static void gst_pipeline_init (GTypeInstance * instance, gpointer g_class);
132 static void gst_pipeline_dispose (GObject * object);
133 static void gst_pipeline_set_property (GObject * object, guint prop_id,
134 const GValue * value, GParamSpec * pspec);
135 static void gst_pipeline_get_property (GObject * object, guint prop_id,
136 GValue * value, GParamSpec * pspec);
138 static GstClock *gst_pipeline_provide_clock_func (GstElement * element);
139 static GstStateChangeReturn gst_pipeline_change_state (GstElement * element,
140 GstStateChange transition);
142 static void gst_pipeline_handle_message (GstBin * bin, GstMessage * message);
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 GstBinClass *gstbin_class = GST_BIN_CLASS (g_class);
190 GstPipelineClass *klass = GST_PIPELINE_CLASS (g_class);
192 parent_class = g_type_class_peek_parent (klass);
194 g_type_class_add_private (klass, sizeof (GstPipelinePrivate));
196 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_pipeline_set_property);
197 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_pipeline_get_property);
202 * The expected delay needed for elements to spin up to the
203 * PLAYING state expressed in nanoseconds.
204 * see gst_pipeline_set_delay() for more information on this option.
208 g_object_class_install_property (gobject_class, PROP_DELAY,
209 g_param_spec_uint64 ("delay", "Delay",
210 "Expected delay needed for elements "
211 "to spin up to PLAYING in nanoseconds", 0, G_MAXUINT64, DEFAULT_DELAY,
215 * GstPipeline:auto-flush-bus:
217 * Whether or not to automatically flush all messages on the
218 * pipeline's bus when going from READY to NULL state. Please see
219 * gst_pipeline_set_auto_flush_bus() for more information on this option.
223 g_object_class_install_property (gobject_class, PROP_AUTO_FLUSH_BUS,
224 g_param_spec_boolean ("auto-flush-bus", "Auto Flush Bus",
225 "Whether to automatically flush the pipeline's bus when going "
226 "from READY into NULL state", DEFAULT_AUTO_FLUSH_BUS,
229 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pipeline_dispose);
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);
236 gstbin_class->handle_message =
237 GST_DEBUG_FUNCPTR (gst_pipeline_handle_message);
241 gst_pipeline_init (GTypeInstance * instance, gpointer g_class)
243 GstPipeline *pipeline = GST_PIPELINE (instance);
246 pipeline->priv = GST_PIPELINE_GET_PRIVATE (pipeline);
248 /* set default property values */
249 pipeline->priv->auto_flush_bus = DEFAULT_AUTO_FLUSH_BUS;
250 pipeline->delay = DEFAULT_DELAY;
252 /* create and set a default bus */
253 bus = gst_bus_new ();
255 /* FIXME, disabled for 0.10.5 release as it caused to many regressions */
256 /* Start our bus in flushing if appropriate */
257 if (pipeline->priv->auto_flush_bus)
258 gst_bus_set_flushing (bus, TRUE);
261 gst_element_set_bus (GST_ELEMENT_CAST (pipeline), bus);
262 GST_DEBUG_OBJECT (pipeline, "set bus %" GST_PTR_FORMAT " on pipeline", bus);
263 gst_object_unref (bus);
267 gst_pipeline_dispose (GObject * object)
269 GstPipeline *pipeline = GST_PIPELINE (object);
270 GstClock **clock_p = &pipeline->fixed_clock;
272 GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pipeline, "dispose");
274 /* clear and unref any fixed clock */
275 gst_object_replace ((GstObject **) clock_p, NULL);
277 G_OBJECT_CLASS (parent_class)->dispose (object);
281 gst_pipeline_set_property (GObject * object, guint prop_id,
282 const GValue * value, GParamSpec * pspec)
284 GstPipeline *pipeline = GST_PIPELINE (object);
288 gst_pipeline_set_delay (pipeline, g_value_get_uint64 (value));
290 case PROP_AUTO_FLUSH_BUS:
291 gst_pipeline_set_auto_flush_bus (pipeline, g_value_get_boolean (value));
294 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
300 gst_pipeline_get_property (GObject * object, guint prop_id,
301 GValue * value, GParamSpec * pspec)
303 GstPipeline *pipeline = GST_PIPELINE (object);
307 g_value_set_uint64 (value, gst_pipeline_get_delay (pipeline));
309 case PROP_AUTO_FLUSH_BUS:
310 g_value_set_boolean (value, gst_pipeline_get_auto_flush_bus (pipeline));
313 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
318 /* set the stream time to 0 */
320 reset_stream_time (GstPipeline * pipeline)
322 GST_OBJECT_LOCK (pipeline);
323 if (pipeline->stream_time != GST_CLOCK_TIME_NONE) {
324 GST_DEBUG_OBJECT (pipeline, "reset stream_time to 0");
325 pipeline->stream_time = 0;
326 pipeline->priv->new_stream_time = TRUE;
328 GST_DEBUG_OBJECT (pipeline, "application asked to not reset stream_time");
330 GST_OBJECT_UNLOCK (pipeline);
335 * @name: name of new pipeline
337 * Create a new pipeline with the given name.
339 * Returns: newly created GstPipeline
344 gst_pipeline_new (const gchar * name)
346 return gst_element_factory_make ("pipeline", name);
350 static GstStateChangeReturn
351 gst_pipeline_change_state (GstElement * element, GstStateChange transition)
353 GstStateChangeReturn result = GST_STATE_CHANGE_SUCCESS;
354 GstPipeline *pipeline = GST_PIPELINE (element);
357 switch (transition) {
358 case GST_STATE_CHANGE_NULL_TO_READY:
359 GST_OBJECT_LOCK (element);
361 gst_bus_set_flushing (element->bus, FALSE);
362 GST_OBJECT_UNLOCK (element);
364 case GST_STATE_CHANGE_READY_TO_PAUSED:
366 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
368 GstClockTime new_base_time;
370 GstClockTime min_latency, max_latency;
371 GstClockTime start_time, stream_time, delay;
372 gboolean new_clock, update;
376 GST_DEBUG_OBJECT (element, "selecting clock and base_time");
378 GST_OBJECT_LOCK (element);
379 cur_clock = element->clock;
381 gst_object_ref (cur_clock);
382 stream_time = pipeline->stream_time;
383 update = pipeline->priv->new_stream_time;
384 pipeline->priv->new_stream_time = FALSE;
385 delay = pipeline->delay;
386 GST_OBJECT_UNLOCK (element);
388 /* stream time changed, either with a PAUSED or a flush, we need to check
389 * if there is a new clock & update the base time */
391 GST_DEBUG_OBJECT (pipeline, "stream_time changed. "
392 "Updating base time and checking for new clock.");
394 /* when going to playing, select a clock */
395 clock = gst_element_provide_clock (element);
396 new_clock = (clock != cur_clock);
399 start_time = gst_clock_get_time (clock);
401 GST_DEBUG ("no clock, using base time of NONE");
402 start_time = GST_CLOCK_TIME_NONE;
403 new_base_time = GST_CLOCK_TIME_NONE;
407 /* now distribute the clock (which could be NULL). If some
408 * element refuses the clock, this will return FALSE and
409 * we effectively fail the state change. */
410 if (!gst_element_set_clock (element, clock))
413 /* if we selected and distributed a new clock, let the app
415 gst_element_post_message (element,
416 gst_message_new_new_clock (GST_OBJECT_CAST (element), clock));
420 gst_object_unref (clock);
422 if (stream_time != GST_CLOCK_TIME_NONE
423 && start_time != GST_CLOCK_TIME_NONE) {
424 new_base_time = start_time - stream_time + delay;
425 GST_DEBUG_OBJECT (element,
426 "stream_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
427 ", base_time %" GST_TIME_FORMAT,
428 GST_TIME_ARGS (stream_time), GST_TIME_ARGS (start_time),
429 GST_TIME_ARGS (new_base_time));
431 new_base_time = GST_CLOCK_TIME_NONE;
433 if (new_base_time != GST_CLOCK_TIME_NONE)
434 gst_element_set_base_time (element, new_base_time);
436 GST_DEBUG_OBJECT (pipeline,
437 "NOT adjusting base_time because stream_time is NONE");
439 GST_DEBUG_OBJECT (pipeline,
440 "NOT adjusting base_time because we selected one before");
444 gst_object_unref (cur_clock);
446 /* determine latency in this pipeline */
447 GST_DEBUG_OBJECT (element, "querying pipeline latency");
448 query = gst_query_new_latency ();
449 if (gst_element_query (element, query)) {
452 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
454 GST_DEBUG_OBJECT (element,
455 "configuring min latency %" GST_TIME_FORMAT ", max latency %"
456 GST_TIME_FORMAT ", live %d", GST_TIME_ARGS (min_latency),
457 GST_TIME_ARGS (max_latency), live);
459 /* configure latency on elements */
461 gst_element_send_event (element,
462 gst_event_new_latency (min_latency));
464 GST_INFO_OBJECT (element, "configured latency of %" GST_TIME_FORMAT,
465 GST_TIME_ARGS (min_latency));
467 GST_WARNING_OBJECT (element,
468 "failed to configure latency of %" GST_TIME_FORMAT,
469 GST_TIME_ARGS (min_latency));
470 GST_ELEMENT_WARNING (element, CORE, CLOCK, (NULL),
471 ("Failed to configure latency of %" GST_TIME_FORMAT,
472 GST_TIME_ARGS (min_latency)));
475 /* this is not a real problem, we just don't configure any latency. */
476 GST_WARNING_OBJECT (element, "failed to query pipeline latency");
478 gst_query_unref (query);
481 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
483 case GST_STATE_CHANGE_PAUSED_TO_READY:
484 case GST_STATE_CHANGE_READY_TO_NULL:
488 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
490 switch (transition) {
491 case GST_STATE_CHANGE_NULL_TO_READY:
493 case GST_STATE_CHANGE_READY_TO_PAUSED:
495 reset_stream_time (pipeline);
498 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
500 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
501 GST_OBJECT_LOCK (element);
502 if ((clock = element->clock)) {
505 gst_object_ref (clock);
506 GST_OBJECT_UNLOCK (element);
508 /* calculate the time when we stopped */
509 now = gst_clock_get_time (clock);
510 gst_object_unref (clock);
512 GST_OBJECT_LOCK (element);
513 /* store the current stream time */
514 if (pipeline->stream_time != GST_CLOCK_TIME_NONE) {
515 pipeline->stream_time = now - element->base_time;
516 pipeline->priv->new_stream_time = TRUE;
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);
554 gst_object_unref (clock);
555 return GST_STATE_CHANGE_FAILURE;
560 gst_pipeline_handle_message (GstBin * bin, GstMessage * message)
562 GstPipeline *pipeline = GST_PIPELINE_CAST (bin);
564 switch (GST_MESSAGE_TYPE (message)) {
565 case GST_MESSAGE_ASYNC_START:
567 gboolean new_base_time;
569 gst_message_parse_async_start (message, &new_base_time);
571 /* reset our stream time if we need to distribute a new base_time to the
574 reset_stream_time (pipeline);
581 GST_BIN_CLASS (parent_class)->handle_message (bin, message);
586 * gst_pipeline_get_bus:
587 * @pipeline: a #GstPipeline
589 * Gets the #GstBus of @pipeline.
591 * Returns: a #GstBus, unref after usage.
596 gst_pipeline_get_bus (GstPipeline * pipeline)
598 return gst_element_get_bus (GST_ELEMENT (pipeline));
602 * gst_pipeline_set_new_stream_time:
603 * @pipeline: a #GstPipeline
604 * @time: the new stream time to set
606 * Set the new stream time of @pipeline to @time. The stream time is used to
607 * set the base time on the elements (see gst_element_set_base_time())
608 * in the PAUSED->PLAYING state transition.
610 * Setting @time to #GST_CLOCK_TIME_NONE will disable the pipeline's management
611 * of element base time. The application will then be responsible for
612 * performing base time distribution. This is sometimes useful if you want to
613 * synchronize capture from multiple pipelines, and you can also ensure that the
614 * pipelines have the same clock.
619 gst_pipeline_set_new_stream_time (GstPipeline * pipeline, GstClockTime time)
621 g_return_if_fail (GST_IS_PIPELINE (pipeline));
623 GST_OBJECT_LOCK (pipeline);
624 pipeline->stream_time = time;
625 pipeline->priv->new_stream_time = TRUE;
626 GST_OBJECT_UNLOCK (pipeline);
628 GST_DEBUG_OBJECT (pipeline, "set new stream_time to %" GST_TIME_FORMAT,
629 GST_TIME_ARGS (time));
631 if (time == GST_CLOCK_TIME_NONE)
632 GST_DEBUG_OBJECT (pipeline, "told not to adjust base_time");
636 * gst_pipeline_get_last_stream_time:
637 * @pipeline: a #GstPipeline
639 * Gets the last stream time of @pipeline. If the pipeline is PLAYING,
640 * the returned time is the stream time used to configure the element's
641 * base time in the PAUSED->PLAYING state. If the pipeline is PAUSED, the
642 * returned time is the stream time when the pipeline was paused.
644 * This function returns #GST_CLOCK_TIME_NONE if the pipeline was
645 * configured to not handle the management of the element's base time
646 * (see gst_pipeline_set_new_stream_time()).
648 * Returns: a #GstClockTime.
653 gst_pipeline_get_last_stream_time (GstPipeline * pipeline)
657 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
659 GST_OBJECT_LOCK (pipeline);
660 result = pipeline->stream_time;
661 GST_OBJECT_UNLOCK (pipeline);
667 gst_pipeline_provide_clock_func (GstElement * element)
669 GstClock *clock = NULL;
670 GstPipeline *pipeline = GST_PIPELINE (element);
672 /* if we have a fixed clock, use that one */
673 GST_OBJECT_LOCK (pipeline);
674 if (GST_OBJECT_FLAG_IS_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK)) {
675 clock = pipeline->fixed_clock;
677 gst_object_ref (clock);
678 GST_OBJECT_UNLOCK (pipeline);
680 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)",
681 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
683 GST_OBJECT_UNLOCK (pipeline);
684 /* let the parent bin select a clock */
686 GST_ELEMENT_CLASS (parent_class)->
687 provide_clock (GST_ELEMENT (pipeline));
688 /* no clock, use a system clock */
690 clock = gst_system_clock_obtain ();
692 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained system clock: %p (%s)",
693 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
695 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained clock: %p (%s)",
696 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
703 * gst_pipeline_get_clock:
704 * @pipeline: a #GstPipeline
706 * Gets the current clock used by @pipeline.
708 * Returns: a #GstClock, unref after usage.
711 gst_pipeline_get_clock (GstPipeline * pipeline)
713 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), NULL);
715 return gst_pipeline_provide_clock_func (GST_ELEMENT (pipeline));
720 * gst_pipeline_use_clock:
721 * @pipeline: a #GstPipeline
722 * @clock: the clock to use
724 * Force @pipeline to use the given @clock. The pipeline will
725 * always use the given clock even if new clock providers are added
728 * If @clock is NULL all clocking will be disabled which will make
729 * the pipeline run as fast as possible.
734 gst_pipeline_use_clock (GstPipeline * pipeline, GstClock * clock)
738 g_return_if_fail (GST_IS_PIPELINE (pipeline));
740 GST_OBJECT_LOCK (pipeline);
741 GST_OBJECT_FLAG_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
743 clock_p = &pipeline->fixed_clock;
744 gst_object_replace ((GstObject **) clock_p, (GstObject *) clock);
745 GST_OBJECT_UNLOCK (pipeline);
747 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)", clock,
748 (clock ? GST_OBJECT_NAME (clock) : "nil"));
752 * gst_pipeline_set_clock:
753 * @pipeline: a #GstPipeline
754 * @clock: the clock to set
756 * Set the clock for @pipeline. The clock will be distributed
757 * to all the elements managed by the pipeline.
759 * Returns: TRUE if the clock could be set on the pipeline. FALSE if
760 * some element did not accept the clock.
765 gst_pipeline_set_clock (GstPipeline * pipeline, GstClock * clock)
767 g_return_val_if_fail (pipeline != NULL, FALSE);
768 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), FALSE);
770 return GST_ELEMENT_CLASS (parent_class)->set_clock (GST_ELEMENT (pipeline),
775 * gst_pipeline_auto_clock:
776 * @pipeline: a #GstPipeline
778 * Let @pipeline select a clock automatically. This is the default
781 * Use this function if you previous forced a fixed clock with
782 * gst_pipeline_use_clock() and want to restore the default
783 * pipeline clock selection algorithm.
788 gst_pipeline_auto_clock (GstPipeline * pipeline)
792 g_return_if_fail (pipeline != NULL);
793 g_return_if_fail (GST_IS_PIPELINE (pipeline));
795 GST_OBJECT_LOCK (pipeline);
796 GST_OBJECT_FLAG_UNSET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
798 clock_p = &pipeline->fixed_clock;
799 gst_object_replace ((GstObject **) clock_p, NULL);
800 GST_OBJECT_UNLOCK (pipeline);
802 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using automatic clock");
806 * gst_pipeline_set_delay:
807 * @pipeline: a #GstPipeline
810 * Set the expected delay needed for all elements to perform the
811 * PAUSED to PLAYING state change. @delay will be added to the
812 * base time of the elements so that they wait an additional @delay
813 * amount of time before starting to process buffers and cannot be
814 * #GST_CLOCK_TIME_NONE.
816 * This option is used for tuning purposes and should normally not be
824 gst_pipeline_set_delay (GstPipeline * pipeline, GstClockTime delay)
826 g_return_if_fail (GST_IS_PIPELINE (pipeline));
827 g_return_if_fail (delay != GST_CLOCK_TIME_NONE);
829 GST_OBJECT_LOCK (pipeline);
830 pipeline->delay = delay;
831 GST_OBJECT_UNLOCK (pipeline);
835 * gst_pipeline_get_delay:
836 * @pipeline: a #GstPipeline
838 * Get the configured delay (see gst_pipeline_set_delay()).
840 * Returns: The configured delay.
847 gst_pipeline_get_delay (GstPipeline * pipeline)
851 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
853 GST_OBJECT_LOCK (pipeline);
854 res = pipeline->delay;
855 GST_OBJECT_UNLOCK (pipeline);
861 * gst_pipeline_set_auto_flush_bus:
862 * @pipeline: a #GstPipeline
863 * @auto_flush: whether or not to automatically flush the bus when
864 * the pipeline goes from READY to NULL state
866 * Usually, when a pipeline goes from READY to NULL state, it automatically
867 * flushes all pending messages on the bus, which is done for refcounting
868 * purposes, to break circular references.
870 * This means that applications that update state using (async) bus messages
871 * (e.g. do certain things when a pipeline goes from PAUSED to READY) might
872 * not get to see messages when the pipeline is shut down, because they might
873 * be flushed before they can be dispatched in the main thread. This behaviour
874 * can be disabled using this function.
876 * It is important that all messages on the bus are handled when the
877 * automatic flushing is disabled else memory leaks will be introduced.
884 gst_pipeline_set_auto_flush_bus (GstPipeline * pipeline, gboolean auto_flush)
886 g_return_if_fail (GST_IS_PIPELINE (pipeline));
888 GST_OBJECT_LOCK (pipeline);
889 pipeline->priv->auto_flush_bus = auto_flush;
890 GST_OBJECT_UNLOCK (pipeline);
894 * gst_pipeline_get_auto_flush_bus:
895 * @pipeline: a #GstPipeline
897 * Check if @pipeline will automatically flush messages when going to
900 * Returns: whether the pipeline will automatically flush its bus when
901 * going from READY to NULL state or not.
908 gst_pipeline_get_auto_flush_bus (GstPipeline * pipeline)
912 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), FALSE);
914 GST_OBJECT_LOCK (pipeline);
915 res = pipeline->priv->auto_flush_bus;
916 GST_OBJECT_UNLOCK (pipeline);