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 behaviour 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 running time for the elements. The running
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 running 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. The effect is that the running time (as the difference
72 * between the clock time and the base time) will count how much time was spent
73 * in the PLAYING state. This default behaviour can be changed with the
74 * gst_element_set_start_time() method.
76 * When sending a flushing seek event to a GstPipeline (see
77 * gst_element_seek()), it will make sure that the pipeline is properly
78 * PAUSED and resumed as well as set the new running time to 0 when the
81 * Last reviewed on 2009-05-29 (0.10.24)
84 #include "gst_private.h"
86 #include "gst-i18n-lib.h"
88 #include "gstpipeline.h"
90 #include "gstsystemclock.h"
93 GST_DEBUG_CATEGORY_STATIC (pipeline_debug);
94 #define GST_CAT_DEFAULT pipeline_debug
96 /* Pipeline signals and args */
103 #define DEFAULT_DELAY 0
104 #define DEFAULT_AUTO_FLUSH_BUS TRUE
113 #define GST_PIPELINE_GET_PRIVATE(obj) \
114 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_PIPELINE, GstPipelinePrivate))
116 struct _GstPipelinePrivate
119 gboolean auto_flush_bus;
121 /* when we need to update stream_time or clock when going back to
123 GstClockTime last_start_time;
124 gboolean update_clock;
128 static void gst_pipeline_dispose (GObject * object);
129 static void gst_pipeline_set_property (GObject * object, guint prop_id,
130 const GValue * value, GParamSpec * pspec);
131 static void gst_pipeline_get_property (GObject * object, guint prop_id,
132 GValue * value, GParamSpec * pspec);
134 static GstClock *gst_pipeline_provide_clock_func (GstElement * element);
135 static GstStateChangeReturn gst_pipeline_change_state (GstElement * element,
136 GstStateChange transition);
138 static void gst_pipeline_handle_message (GstBin * bin, GstMessage * message);
140 /* static guint gst_pipeline_signals[LAST_SIGNAL] = { 0 }; */
142 #define _do_init(type) \
144 GST_DEBUG_CATEGORY_INIT (pipeline_debug, "pipeline", GST_DEBUG_BOLD, \
145 "debugging info for the 'pipeline' container element"); \
148 GST_BOILERPLATE_FULL (GstPipeline, gst_pipeline, GstBin, GST_TYPE_BIN,
152 gst_pipeline_base_init (gpointer g_class)
154 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
156 gst_element_class_set_details_simple (gstelement_class, "Pipeline object",
158 "Complete pipeline object",
159 "Erik Walthinsen <omega@cse.ogi.edu>, Wim Taymans <wim@fluendo.com>");
163 gst_pipeline_class_init (GstPipelineClass * klass)
165 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
166 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
167 GstBinClass *gstbin_class = GST_BIN_CLASS (klass);
169 g_type_class_add_private (klass, sizeof (GstPipelinePrivate));
171 gobject_class->set_property = gst_pipeline_set_property;
172 gobject_class->get_property = gst_pipeline_get_property;
177 * The expected delay needed for elements to spin up to the
178 * PLAYING state expressed in nanoseconds.
179 * see gst_pipeline_set_delay() for more information on this option.
183 g_object_class_install_property (gobject_class, PROP_DELAY,
184 g_param_spec_uint64 ("delay", "Delay",
185 "Expected delay needed for elements "
186 "to spin up to PLAYING in nanoseconds", 0, G_MAXUINT64, DEFAULT_DELAY,
187 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
190 * GstPipeline:auto-flush-bus:
192 * Whether or not to automatically flush all messages on the
193 * pipeline's bus when going from READY to NULL state. Please see
194 * gst_pipeline_set_auto_flush_bus() for more information on this option.
198 g_object_class_install_property (gobject_class, PROP_AUTO_FLUSH_BUS,
199 g_param_spec_boolean ("auto-flush-bus", "Auto Flush Bus",
200 "Whether to automatically flush the pipeline's bus when going "
201 "from READY into NULL state", DEFAULT_AUTO_FLUSH_BUS,
202 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
204 gobject_class->dispose = gst_pipeline_dispose;
206 gstelement_class->change_state =
207 GST_DEBUG_FUNCPTR (gst_pipeline_change_state);
208 gstelement_class->provide_clock =
209 GST_DEBUG_FUNCPTR (gst_pipeline_provide_clock_func);
210 gstbin_class->handle_message =
211 GST_DEBUG_FUNCPTR (gst_pipeline_handle_message);
215 gst_pipeline_init (GstPipeline * pipeline, GstPipelineClass * klass)
219 pipeline->priv = GST_PIPELINE_GET_PRIVATE (pipeline);
221 /* set default property values */
222 pipeline->priv->auto_flush_bus = DEFAULT_AUTO_FLUSH_BUS;
223 pipeline->delay = DEFAULT_DELAY;
225 /* create and set a default bus */
226 bus = gst_bus_new ();
228 /* FIXME, disabled for 0.10.5 release as it caused to many regressions */
229 /* Start our bus in flushing if appropriate */
230 if (pipeline->priv->auto_flush_bus)
231 gst_bus_set_flushing (bus, TRUE);
234 gst_element_set_bus (GST_ELEMENT_CAST (pipeline), bus);
235 GST_DEBUG_OBJECT (pipeline, "set bus %" GST_PTR_FORMAT " on pipeline", bus);
236 gst_object_unref (bus);
240 gst_pipeline_dispose (GObject * object)
242 GstPipeline *pipeline = GST_PIPELINE (object);
243 GstClock **clock_p = &pipeline->fixed_clock;
245 GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pipeline, "dispose");
247 /* clear and unref any fixed clock */
248 gst_object_replace ((GstObject **) clock_p, NULL);
250 G_OBJECT_CLASS (parent_class)->dispose (object);
254 gst_pipeline_set_property (GObject * object, guint prop_id,
255 const GValue * value, GParamSpec * pspec)
257 GstPipeline *pipeline = GST_PIPELINE (object);
261 gst_pipeline_set_delay (pipeline, g_value_get_uint64 (value));
263 case PROP_AUTO_FLUSH_BUS:
264 gst_pipeline_set_auto_flush_bus (pipeline, g_value_get_boolean (value));
267 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
273 gst_pipeline_get_property (GObject * object, guint prop_id,
274 GValue * value, GParamSpec * pspec)
276 GstPipeline *pipeline = GST_PIPELINE (object);
280 g_value_set_uint64 (value, gst_pipeline_get_delay (pipeline));
282 case PROP_AUTO_FLUSH_BUS:
283 g_value_set_boolean (value, gst_pipeline_get_auto_flush_bus (pipeline));
286 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
291 /* set the start_time to 0, this will cause us to select a new base_time and
292 * make the running_time start from 0 again. */
294 reset_start_time (GstPipeline * pipeline)
296 GST_OBJECT_LOCK (pipeline);
297 if (GST_ELEMENT_START_TIME (pipeline) != GST_CLOCK_TIME_NONE) {
298 GST_DEBUG_OBJECT (pipeline, "reset start_time to 0");
299 GST_ELEMENT_START_TIME (pipeline) = 0;
300 pipeline->priv->last_start_time = -1;
302 GST_DEBUG_OBJECT (pipeline, "application asked to not reset stream_time");
304 GST_OBJECT_UNLOCK (pipeline);
309 * @name: name of new pipeline
311 * Create a new pipeline with the given name.
313 * Returns: (transfer full): newly created GstPipeline
318 gst_pipeline_new (const gchar * name)
320 return gst_element_factory_make ("pipeline", name);
323 /* takes a snapshot of the running_time of the pipeline and store this as the
324 * element start_time. This is the time we will set as the running_time of the
325 * pipeline when we go to PLAYING next. */
327 pipeline_update_start_time (GstElement * element)
329 GstPipeline *pipeline = GST_PIPELINE_CAST (element);
332 GST_OBJECT_LOCK (element);
333 if ((clock = element->clock)) {
336 gst_object_ref (clock);
337 GST_OBJECT_UNLOCK (element);
339 /* calculate the time when we stopped */
340 now = gst_clock_get_time (clock);
341 gst_object_unref (clock);
343 GST_OBJECT_LOCK (element);
344 /* store the current running time */
345 if (GST_ELEMENT_START_TIME (pipeline) != GST_CLOCK_TIME_NONE) {
346 if (now != GST_CLOCK_TIME_NONE)
347 GST_ELEMENT_START_TIME (pipeline) = now - element->base_time;
349 GST_WARNING_OBJECT (element,
350 "Clock %s returned invalid time, can't calculate "
351 "running_time when going to the PAUSED state",
352 GST_OBJECT_NAME (clock));
354 /* we went to PAUSED, when going to PLAYING select clock and new
356 pipeline->priv->update_clock = TRUE;
358 GST_DEBUG_OBJECT (element,
359 "start_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
360 ", base_time %" GST_TIME_FORMAT,
361 GST_TIME_ARGS (GST_ELEMENT_START_TIME (pipeline)),
362 GST_TIME_ARGS (now), GST_TIME_ARGS (element->base_time));
364 GST_OBJECT_UNLOCK (element);
368 static GstStateChangeReturn
369 gst_pipeline_change_state (GstElement * element, GstStateChange transition)
371 GstStateChangeReturn result = GST_STATE_CHANGE_SUCCESS;
372 GstPipeline *pipeline = GST_PIPELINE_CAST (element);
375 switch (transition) {
376 case GST_STATE_CHANGE_NULL_TO_READY:
377 GST_OBJECT_LOCK (element);
379 gst_bus_set_flushing (element->bus, FALSE);
380 GST_OBJECT_UNLOCK (element);
382 case GST_STATE_CHANGE_READY_TO_PAUSED:
383 GST_OBJECT_LOCK (element);
384 pipeline->priv->update_clock = TRUE;
385 GST_OBJECT_UNLOCK (element);
387 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
389 GstClockTime now, start_time, last_start_time, delay;
390 gboolean update_clock;
393 GST_DEBUG_OBJECT (element, "selecting clock and base_time");
395 GST_OBJECT_LOCK (element);
396 cur_clock = element->clock;
398 gst_object_ref (cur_clock);
399 /* get the desired running_time of the first buffer aka the start_time */
400 start_time = GST_ELEMENT_START_TIME (pipeline);
401 last_start_time = pipeline->priv->last_start_time;
402 pipeline->priv->last_start_time = start_time;
403 /* see if we need to update the clock */
404 update_clock = pipeline->priv->update_clock;
405 pipeline->priv->update_clock = FALSE;
406 delay = pipeline->delay;
407 GST_OBJECT_UNLOCK (element);
409 /* running time changed, either with a PAUSED or a flush, we need to check
410 * if there is a new clock & update the base time */
411 /* only do this for top-level, however */
412 if (GST_OBJECT_PARENT (element) == NULL &&
413 (update_clock || last_start_time != start_time)) {
414 GST_DEBUG_OBJECT (pipeline, "Need to update start_time");
416 /* when going to PLAYING, select a clock when needed. If we just got
417 * flushed, we don't reselect the clock. */
419 GST_DEBUG_OBJECT (pipeline, "Need to update clock.");
420 clock = gst_element_provide_clock (element);
422 GST_DEBUG_OBJECT (pipeline,
423 "Don't need to update clock, using old clock.");
424 clock = gst_object_ref (cur_clock);
428 now = gst_clock_get_time (clock);
430 GST_DEBUG_OBJECT (pipeline, "no clock, using base time of NONE");
431 now = GST_CLOCK_TIME_NONE;
434 if (clock != cur_clock) {
435 /* now distribute the clock (which could be NULL). If some
436 * element refuses the clock, this will return FALSE and
437 * we effectively fail the state change. */
438 if (!gst_element_set_clock (element, clock))
441 /* if we selected and distributed a new clock, let the app
443 gst_element_post_message (element,
444 gst_message_new_new_clock (GST_OBJECT_CAST (element), clock));
448 gst_object_unref (clock);
450 if (start_time != GST_CLOCK_TIME_NONE && now != GST_CLOCK_TIME_NONE) {
451 GstClockTime new_base_time = now - start_time + delay;
452 GST_DEBUG_OBJECT (element,
453 "start_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
454 ", base_time %" GST_TIME_FORMAT,
455 GST_TIME_ARGS (start_time), GST_TIME_ARGS (now),
456 GST_TIME_ARGS (new_base_time));
458 gst_element_set_base_time (element, new_base_time);
460 GST_DEBUG_OBJECT (pipeline,
461 "NOT adjusting base_time because start_time is NONE");
464 GST_DEBUG_OBJECT (pipeline,
465 "NOT adjusting base_time because we selected one before");
469 gst_object_unref (cur_clock);
472 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
474 /* we take a start_time snapshot before calling the children state changes
475 * so that they know about when the pipeline PAUSED. */
476 pipeline_update_start_time (element);
479 case GST_STATE_CHANGE_PAUSED_TO_READY:
480 case GST_STATE_CHANGE_READY_TO_NULL:
484 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
486 switch (transition) {
487 case GST_STATE_CHANGE_NULL_TO_READY:
489 case GST_STATE_CHANGE_READY_TO_PAUSED:
491 reset_start_time (pipeline);
494 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
496 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
498 /* Take a new snapshot of the start_time after calling the state change on
499 * all children. This will be the running_time of the pipeline when we go
501 pipeline_update_start_time (element);
504 case GST_STATE_CHANGE_PAUSED_TO_READY:
506 case GST_STATE_CHANGE_READY_TO_NULL:
511 /* grab some stuff before we release the lock to flush out the bus */
512 GST_OBJECT_LOCK (element);
513 if ((bus = element->bus))
514 gst_object_ref (bus);
515 auto_flush = pipeline->priv->auto_flush_bus;
516 GST_OBJECT_UNLOCK (element);
520 gst_bus_set_flushing (bus, TRUE);
522 GST_INFO_OBJECT (element, "not flushing bus, auto-flushing disabled");
524 gst_object_unref (bus);
534 /* we generate this error when the selected clock was not
535 * accepted by some element */
536 GST_ELEMENT_ERROR (pipeline, CORE, CLOCK,
537 (_("Selected clock cannot be used in pipeline.")),
538 ("Pipeline cannot operate with selected clock"));
539 GST_DEBUG_OBJECT (pipeline,
540 "Pipeline cannot operate with selected clock %p", clock);
542 gst_object_unref (clock);
543 return GST_STATE_CHANGE_FAILURE;
547 /* intercept the bus messages from our children. We watch for the ASYNC_START
548 * message with is posted by the elements (sinks) that require a reset of the
549 * running_time after a flush. ASYNC_START also brings the pipeline back into
550 * the PAUSED, pending PAUSED state. When the ASYNC_DONE message is received the
551 * pipeline will redistribute the new base_time and will bring the elements back
552 * to the desired state of the pipeline. */
554 gst_pipeline_handle_message (GstBin * bin, GstMessage * message)
556 GstPipeline *pipeline = GST_PIPELINE_CAST (bin);
558 switch (GST_MESSAGE_TYPE (message)) {
559 case GST_MESSAGE_ASYNC_START:
561 gboolean new_base_time;
563 gst_message_parse_async_start (message, &new_base_time);
565 /* reset our running time if we need to distribute a new base_time to the
568 reset_start_time (pipeline);
572 case GST_MESSAGE_CLOCK_LOST:
576 gst_message_parse_clock_lost (message, &clock);
578 GST_OBJECT_LOCK (bin);
579 if (clock == GST_ELEMENT_CAST (bin)->clock) {
580 GST_DEBUG_OBJECT (bin, "Used clock '%s' got lost",
581 GST_OBJECT_NAME (clock));
582 pipeline->priv->update_clock = TRUE;
584 GST_OBJECT_UNLOCK (bin);
589 GST_BIN_CLASS (parent_class)->handle_message (bin, message);
593 * gst_pipeline_get_bus:
594 * @pipeline: a #GstPipeline
596 * Gets the #GstBus of @pipeline. The bus allows applications to receive
597 * #GstMessage packets.
599 * Returns: (transfer full): a #GstBus, unref after usage.
604 gst_pipeline_get_bus (GstPipeline * pipeline)
606 return gst_element_get_bus (GST_ELEMENT_CAST (pipeline));
610 * gst_pipeline_set_new_stream_time:
611 * @pipeline: a #GstPipeline
612 * @time: the new running time to set
614 * Set the new start time of @pipeline to @time. The start time is used to
615 * set the base time on the elements (see gst_element_set_base_time())
616 * in the PAUSED->PLAYING state transition.
618 * Setting @time to #GST_CLOCK_TIME_NONE will disable the pipeline's management
619 * of element base time. The application will then be responsible for
620 * performing base time distribution. This is sometimes useful if you want to
621 * synchronize capture from multiple pipelines, and you can also ensure that the
622 * pipelines have the same clock.
626 * Deprecated: This function has the wrong name and is equivalent to
627 * gst_element_set_start_time().
629 #ifndef GST_REMOVE_DEPRECATED
630 #ifdef GST_DISABLE_DEPRECATED
632 gst_pipeline_set_new_stream_time (GstPipeline * pipeline, GstClockTime time);
635 gst_pipeline_set_new_stream_time (GstPipeline * pipeline, GstClockTime time)
637 g_return_if_fail (GST_IS_PIPELINE (pipeline));
639 gst_element_set_start_time (GST_ELEMENT_CAST (pipeline), time);
641 if (time == GST_CLOCK_TIME_NONE)
642 GST_DEBUG_OBJECT (pipeline, "told not to adjust base_time");
644 #endif /* GST_REMOVE_DEPRECATED */
647 * gst_pipeline_get_last_stream_time:
648 * @pipeline: a #GstPipeline
650 * Gets the last running time of @pipeline. If the pipeline is PLAYING,
651 * the returned time is the running time used to configure the element's
652 * base time in the PAUSED->PLAYING state. If the pipeline is PAUSED, the
653 * returned time is the running time when the pipeline was paused.
655 * This function returns #GST_CLOCK_TIME_NONE if the pipeline was
656 * configured to not handle the management of the element's base time
657 * (see gst_pipeline_set_new_stream_time()).
661 * Returns: a #GstClockTime.
663 * Deprecated: This function has the wrong name and is equivalent to
664 * gst_element_get_start_time().
666 #ifndef GST_REMOVE_DEPRECATED
667 #ifdef GST_DISABLE_DEPRECATED
668 GstClockTime gst_pipeline_get_last_stream_time (GstPipeline * pipeline);
671 gst_pipeline_get_last_stream_time (GstPipeline * pipeline)
675 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
677 result = gst_element_get_start_time (GST_ELEMENT_CAST (pipeline));
681 #endif /* GST_REMOVE_DEPRECATED */
684 gst_pipeline_provide_clock_func (GstElement * element)
686 GstClock *clock = NULL;
687 GstPipeline *pipeline = GST_PIPELINE (element);
689 /* if we have a fixed clock, use that one */
690 GST_OBJECT_LOCK (pipeline);
691 if (GST_OBJECT_FLAG_IS_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK)) {
692 clock = pipeline->fixed_clock;
694 gst_object_ref (clock);
695 GST_OBJECT_UNLOCK (pipeline);
697 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)",
698 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
700 GST_OBJECT_UNLOCK (pipeline);
701 /* let the parent bin select a clock */
703 GST_ELEMENT_CLASS (parent_class)->provide_clock (GST_ELEMENT
705 /* no clock, use a system clock */
707 clock = gst_system_clock_obtain ();
709 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained system clock: %p (%s)",
710 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
712 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained clock: %p (%s)",
713 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
720 * gst_pipeline_get_clock:
721 * @pipeline: a #GstPipeline
723 * Gets the current clock used by @pipeline.
725 * Returns: (transfer full): a #GstClock, unref after usage.
728 gst_pipeline_get_clock (GstPipeline * pipeline)
730 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), NULL);
732 return gst_pipeline_provide_clock_func (GST_ELEMENT_CAST (pipeline));
737 * gst_pipeline_use_clock:
738 * @pipeline: a #GstPipeline
739 * @clock: (transfer none): the clock to use
741 * Force @pipeline to use the given @clock. The pipeline will
742 * always use the given clock even if new clock providers are added
745 * If @clock is NULL all clocking will be disabled which will make
746 * the pipeline run as fast as possible.
751 gst_pipeline_use_clock (GstPipeline * pipeline, GstClock * clock)
755 g_return_if_fail (GST_IS_PIPELINE (pipeline));
757 GST_OBJECT_LOCK (pipeline);
758 GST_OBJECT_FLAG_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
760 clock_p = &pipeline->fixed_clock;
761 gst_object_replace ((GstObject **) clock_p, (GstObject *) clock);
762 GST_OBJECT_UNLOCK (pipeline);
764 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)", clock,
765 (clock ? GST_OBJECT_NAME (clock) : "nil"));
769 * gst_pipeline_set_clock:
770 * @pipeline: a #GstPipeline
771 * @clock: (transfer none): the clock to set
773 * Set the clock for @pipeline. The clock will be distributed
774 * to all the elements managed by the pipeline.
776 * Returns: TRUE if the clock could be set on the pipeline. FALSE if
777 * some element did not accept the clock.
782 gst_pipeline_set_clock (GstPipeline * pipeline, GstClock * clock)
784 g_return_val_if_fail (pipeline != NULL, FALSE);
785 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), FALSE);
788 GST_ELEMENT_CLASS (parent_class)->set_clock (GST_ELEMENT_CAST (pipeline),
793 * gst_pipeline_auto_clock:
794 * @pipeline: a #GstPipeline
796 * Let @pipeline select a clock automatically. This is the default
799 * Use this function if you previous forced a fixed clock with
800 * gst_pipeline_use_clock() and want to restore the default
801 * pipeline clock selection algorithm.
806 gst_pipeline_auto_clock (GstPipeline * pipeline)
810 g_return_if_fail (pipeline != NULL);
811 g_return_if_fail (GST_IS_PIPELINE (pipeline));
813 GST_OBJECT_LOCK (pipeline);
814 GST_OBJECT_FLAG_UNSET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
816 clock_p = &pipeline->fixed_clock;
817 gst_object_replace ((GstObject **) clock_p, NULL);
818 GST_OBJECT_UNLOCK (pipeline);
820 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using automatic clock");
824 * gst_pipeline_set_delay:
825 * @pipeline: a #GstPipeline
828 * Set the expected delay needed for all elements to perform the
829 * PAUSED to PLAYING state change. @delay will be added to the
830 * base time of the elements so that they wait an additional @delay
831 * amount of time before starting to process buffers and cannot be
832 * #GST_CLOCK_TIME_NONE.
834 * This option is used for tuning purposes and should normally not be
842 gst_pipeline_set_delay (GstPipeline * pipeline, GstClockTime delay)
844 g_return_if_fail (GST_IS_PIPELINE (pipeline));
845 g_return_if_fail (delay != GST_CLOCK_TIME_NONE);
847 GST_OBJECT_LOCK (pipeline);
848 pipeline->delay = delay;
849 GST_OBJECT_UNLOCK (pipeline);
853 * gst_pipeline_get_delay:
854 * @pipeline: a #GstPipeline
856 * Get the configured delay (see gst_pipeline_set_delay()).
858 * Returns: The configured delay.
865 gst_pipeline_get_delay (GstPipeline * pipeline)
869 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
871 GST_OBJECT_LOCK (pipeline);
872 res = pipeline->delay;
873 GST_OBJECT_UNLOCK (pipeline);
879 * gst_pipeline_set_auto_flush_bus:
880 * @pipeline: a #GstPipeline
881 * @auto_flush: whether or not to automatically flush the bus when
882 * the pipeline goes from READY to NULL state
884 * Usually, when a pipeline goes from READY to NULL state, it automatically
885 * flushes all pending messages on the bus, which is done for refcounting
886 * purposes, to break circular references.
888 * This means that applications that update state using (async) bus messages
889 * (e.g. do certain things when a pipeline goes from PAUSED to READY) might
890 * not get to see messages when the pipeline is shut down, because they might
891 * be flushed before they can be dispatched in the main thread. This behaviour
892 * can be disabled using this function.
894 * It is important that all messages on the bus are handled when the
895 * automatic flushing is disabled else memory leaks will be introduced.
902 gst_pipeline_set_auto_flush_bus (GstPipeline * pipeline, gboolean auto_flush)
904 g_return_if_fail (GST_IS_PIPELINE (pipeline));
906 GST_OBJECT_LOCK (pipeline);
907 pipeline->priv->auto_flush_bus = auto_flush;
908 GST_OBJECT_UNLOCK (pipeline);
912 * gst_pipeline_get_auto_flush_bus:
913 * @pipeline: a #GstPipeline
915 * Check if @pipeline will automatically flush messages when going to
918 * Returns: whether the pipeline will automatically flush its bus when
919 * going from READY to NULL state or not.
926 gst_pipeline_get_auto_flush_bus (GstPipeline * pipeline)
930 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), FALSE);
932 GST_OBJECT_LOCK (pipeline);
933 res = pipeline->priv->auto_flush_bus;
934 GST_OBJECT_UNLOCK (pipeline);