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 /* when we need to update stream_time or clock when going back to
126 gboolean update_stream_time;
127 gboolean update_clock;
131 static void gst_pipeline_class_init (gpointer g_class, gpointer class_data);
132 static void gst_pipeline_init (GTypeInstance * instance, gpointer g_class);
134 static void gst_pipeline_dispose (GObject * object);
135 static void gst_pipeline_set_property (GObject * object, guint prop_id,
136 const GValue * value, GParamSpec * pspec);
137 static void gst_pipeline_get_property (GObject * object, guint prop_id,
138 GValue * value, GParamSpec * pspec);
140 static GstClock *gst_pipeline_provide_clock_func (GstElement * element);
141 static GstStateChangeReturn gst_pipeline_change_state (GstElement * element,
142 GstStateChange transition);
144 static void gst_pipeline_handle_message (GstBin * bin, GstMessage * message);
146 static GstBinClass *parent_class = NULL;
148 /* static guint gst_pipeline_signals[LAST_SIGNAL] = { 0 }; */
151 gst_pipeline_get_type (void)
153 static GType pipeline_type = 0;
155 if (G_UNLIKELY (pipeline_type == 0)) {
156 static const GTypeInfo pipeline_info = {
157 sizeof (GstPipelineClass),
160 (GClassInitFunc) gst_pipeline_class_init,
163 sizeof (GstPipeline),
170 g_type_register_static (GST_TYPE_BIN, "GstPipeline", &pipeline_info, 0);
172 GST_DEBUG_CATEGORY_INIT (pipeline_debug, "pipeline", GST_DEBUG_BOLD,
173 "debugging info for the 'pipeline' container element");
175 return pipeline_type;
179 gst_pipeline_class_init (gpointer g_class, gpointer class_data)
181 GObjectClass *gobject_class = G_OBJECT_CLASS (g_class);
182 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
183 GstBinClass *gstbin_class = GST_BIN_CLASS (g_class);
184 GstPipelineClass *klass = GST_PIPELINE_CLASS (g_class);
186 parent_class = g_type_class_peek_parent (klass);
188 g_type_class_add_private (klass, sizeof (GstPipelinePrivate));
190 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_pipeline_set_property);
191 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_pipeline_get_property);
196 * The expected delay needed for elements to spin up to the
197 * PLAYING state expressed in nanoseconds.
198 * see gst_pipeline_set_delay() for more information on this option.
202 g_object_class_install_property (gobject_class, PROP_DELAY,
203 g_param_spec_uint64 ("delay", "Delay",
204 "Expected delay needed for elements "
205 "to spin up to PLAYING in nanoseconds", 0, G_MAXUINT64, DEFAULT_DELAY,
209 * GstPipeline:auto-flush-bus:
211 * Whether or not to automatically flush all messages on the
212 * pipeline's bus when going from READY to NULL state. Please see
213 * gst_pipeline_set_auto_flush_bus() for more information on this option.
217 g_object_class_install_property (gobject_class, PROP_AUTO_FLUSH_BUS,
218 g_param_spec_boolean ("auto-flush-bus", "Auto Flush Bus",
219 "Whether to automatically flush the pipeline's bus when going "
220 "from READY into NULL state", DEFAULT_AUTO_FLUSH_BUS,
223 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pipeline_dispose);
225 gst_element_class_set_details (gstelement_class, &gst_pipeline_details);
227 gstelement_class->change_state =
228 GST_DEBUG_FUNCPTR (gst_pipeline_change_state);
229 gstelement_class->provide_clock =
230 GST_DEBUG_FUNCPTR (gst_pipeline_provide_clock_func);
231 gstbin_class->handle_message =
232 GST_DEBUG_FUNCPTR (gst_pipeline_handle_message);
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 ();
250 /* FIXME, disabled for 0.10.5 release as it caused to many regressions */
251 /* Start our bus in flushing if appropriate */
252 if (pipeline->priv->auto_flush_bus)
253 gst_bus_set_flushing (bus, TRUE);
256 gst_element_set_bus (GST_ELEMENT_CAST (pipeline), bus);
257 GST_DEBUG_OBJECT (pipeline, "set bus %" GST_PTR_FORMAT " on pipeline", bus);
258 gst_object_unref (bus);
262 gst_pipeline_dispose (GObject * object)
264 GstPipeline *pipeline = GST_PIPELINE (object);
265 GstClock **clock_p = &pipeline->fixed_clock;
267 GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pipeline, "dispose");
269 /* clear and unref any fixed clock */
270 gst_object_replace ((GstObject **) clock_p, NULL);
272 G_OBJECT_CLASS (parent_class)->dispose (object);
276 gst_pipeline_set_property (GObject * object, guint prop_id,
277 const GValue * value, GParamSpec * pspec)
279 GstPipeline *pipeline = GST_PIPELINE (object);
283 gst_pipeline_set_delay (pipeline, g_value_get_uint64 (value));
285 case PROP_AUTO_FLUSH_BUS:
286 gst_pipeline_set_auto_flush_bus (pipeline, g_value_get_boolean (value));
289 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
295 gst_pipeline_get_property (GObject * object, guint prop_id,
296 GValue * value, GParamSpec * pspec)
298 GstPipeline *pipeline = GST_PIPELINE (object);
302 g_value_set_uint64 (value, gst_pipeline_get_delay (pipeline));
304 case PROP_AUTO_FLUSH_BUS:
305 g_value_set_boolean (value, gst_pipeline_get_auto_flush_bus (pipeline));
308 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
313 /* set the stream time to 0 */
315 reset_stream_time (GstPipeline * pipeline)
317 GST_OBJECT_LOCK (pipeline);
318 if (pipeline->stream_time != GST_CLOCK_TIME_NONE) {
319 GST_DEBUG_OBJECT (pipeline, "reset stream_time to 0");
320 pipeline->stream_time = 0;
321 pipeline->priv->update_stream_time = TRUE;
323 GST_DEBUG_OBJECT (pipeline, "application asked to not reset stream_time");
325 GST_OBJECT_UNLOCK (pipeline);
330 * @name: name of new pipeline
332 * Create a new pipeline with the given name.
334 * Returns: newly created GstPipeline
339 gst_pipeline_new (const gchar * name)
341 return gst_element_factory_make ("pipeline", name);
345 static GstStateChangeReturn
346 gst_pipeline_change_state (GstElement * element, GstStateChange transition)
348 GstStateChangeReturn result = GST_STATE_CHANGE_SUCCESS;
349 GstPipeline *pipeline = GST_PIPELINE (element);
352 switch (transition) {
353 case GST_STATE_CHANGE_NULL_TO_READY:
354 GST_OBJECT_LOCK (element);
356 gst_bus_set_flushing (element->bus, FALSE);
357 GST_OBJECT_UNLOCK (element);
359 case GST_STATE_CHANGE_READY_TO_PAUSED:
360 GST_OBJECT_LOCK (element);
361 pipeline->priv->update_clock = TRUE;
362 GST_OBJECT_UNLOCK (element);
364 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
366 GstClockTime new_base_time;
367 GstClockTime start_time, stream_time, delay;
368 gboolean new_clock, update_stream_time, update_clock;
371 GST_DEBUG_OBJECT (element, "selecting clock and base_time");
373 GST_OBJECT_LOCK (element);
374 cur_clock = element->clock;
376 gst_object_ref (cur_clock);
377 stream_time = pipeline->stream_time;
378 update_stream_time = pipeline->priv->update_stream_time;
379 update_clock = pipeline->priv->update_clock;
380 pipeline->priv->update_stream_time = FALSE;
381 pipeline->priv->update_clock = FALSE;
382 delay = pipeline->delay;
383 GST_OBJECT_UNLOCK (element);
385 /* stream time changed, either with a PAUSED or a flush, we need to check
386 * if there is a new clock & update the base time */
387 if (update_stream_time) {
388 GST_DEBUG_OBJECT (pipeline, "Need to update stream_time");
390 /* when going to PLAYING, select a clock when needed. If we just got
391 * flushed, we don't reselect the clock. */
393 GST_DEBUG_OBJECT (pipeline, "Need to update clock.");
394 clock = gst_element_provide_clock (element);
396 GST_DEBUG_OBJECT (pipeline,
397 "Don't need to update clock, using old clock.");
398 clock = gst_object_ref (cur_clock);
401 new_clock = (clock != cur_clock);
404 start_time = gst_clock_get_time (clock);
406 GST_DEBUG ("no clock, using base time of NONE");
407 start_time = GST_CLOCK_TIME_NONE;
408 new_base_time = GST_CLOCK_TIME_NONE;
412 /* now distribute the clock (which could be NULL). If some
413 * element refuses the clock, this will return FALSE and
414 * we effectively fail the state change. */
415 if (!gst_element_set_clock (element, clock))
418 /* if we selected and distributed a new clock, let the app
420 gst_element_post_message (element,
421 gst_message_new_new_clock (GST_OBJECT_CAST (element), clock));
425 gst_object_unref (clock);
427 if (stream_time != GST_CLOCK_TIME_NONE
428 && start_time != GST_CLOCK_TIME_NONE) {
429 new_base_time = start_time - stream_time + delay;
430 GST_DEBUG_OBJECT (element,
431 "stream_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
432 ", base_time %" GST_TIME_FORMAT,
433 GST_TIME_ARGS (stream_time), GST_TIME_ARGS (start_time),
434 GST_TIME_ARGS (new_base_time));
436 new_base_time = GST_CLOCK_TIME_NONE;
438 if (new_base_time != GST_CLOCK_TIME_NONE)
439 gst_element_set_base_time (element, new_base_time);
441 GST_DEBUG_OBJECT (pipeline,
442 "NOT adjusting base_time because stream_time is NONE");
444 GST_DEBUG_OBJECT (pipeline,
445 "NOT adjusting base_time because we selected one before");
449 gst_object_unref (cur_clock);
452 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
454 case GST_STATE_CHANGE_PAUSED_TO_READY:
455 case GST_STATE_CHANGE_READY_TO_NULL:
459 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
461 switch (transition) {
462 case GST_STATE_CHANGE_NULL_TO_READY:
464 case GST_STATE_CHANGE_READY_TO_PAUSED:
466 reset_stream_time (pipeline);
469 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
471 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
472 GST_OBJECT_LOCK (element);
473 if ((clock = element->clock)) {
476 gst_object_ref (clock);
477 GST_OBJECT_UNLOCK (element);
479 /* calculate the time when we stopped */
480 now = gst_clock_get_time (clock);
481 gst_object_unref (clock);
483 GST_OBJECT_LOCK (element);
484 /* store the current stream time */
485 if (pipeline->stream_time != GST_CLOCK_TIME_NONE) {
486 pipeline->stream_time = now - element->base_time;
487 /* we went to PAUSED, when going to PLAYING select clock and new
489 pipeline->priv->update_stream_time = TRUE;
490 pipeline->priv->update_clock = TRUE;
493 GST_DEBUG_OBJECT (element,
494 "stream_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
495 ", base_time %" GST_TIME_FORMAT,
496 GST_TIME_ARGS (pipeline->stream_time), GST_TIME_ARGS (now),
497 GST_TIME_ARGS (element->base_time));
499 GST_OBJECT_UNLOCK (element);
501 case GST_STATE_CHANGE_PAUSED_TO_READY:
503 case GST_STATE_CHANGE_READY_TO_NULL:
504 GST_OBJECT_LOCK (element);
506 if (pipeline->priv->auto_flush_bus) {
507 gst_bus_set_flushing (element->bus, TRUE);
509 GST_INFO_OBJECT (element, "not flushing bus, auto-flushing disabled");
512 GST_OBJECT_UNLOCK (element);
520 /* we generate this error when the selected clock was not
521 * accepted by some element */
522 GST_ELEMENT_ERROR (pipeline, CORE, CLOCK,
523 (_("Selected clock cannot be used in pipeline.")),
524 ("Pipeline cannot operate with selected clock"));
525 GST_DEBUG_OBJECT (pipeline,
526 "Pipeline cannot operate with selected clock %p", clock);
528 gst_object_unref (clock);
529 return GST_STATE_CHANGE_FAILURE;
534 gst_pipeline_handle_message (GstBin * bin, GstMessage * message)
536 GstPipeline *pipeline = GST_PIPELINE_CAST (bin);
538 switch (GST_MESSAGE_TYPE (message)) {
539 case GST_MESSAGE_ASYNC_START:
541 gboolean new_base_time;
543 gst_message_parse_async_start (message, &new_base_time);
545 /* reset our stream time if we need to distribute a new base_time to the
548 reset_stream_time (pipeline);
555 GST_BIN_CLASS (parent_class)->handle_message (bin, message);
559 * gst_pipeline_get_bus:
560 * @pipeline: a #GstPipeline
562 * Gets the #GstBus of @pipeline.
564 * Returns: a #GstBus, unref after usage.
569 gst_pipeline_get_bus (GstPipeline * pipeline)
571 return gst_element_get_bus (GST_ELEMENT (pipeline));
575 * gst_pipeline_set_new_stream_time:
576 * @pipeline: a #GstPipeline
577 * @time: the new stream time to set
579 * Set the new stream time of @pipeline to @time. The stream time is used to
580 * set the base time on the elements (see gst_element_set_base_time())
581 * in the PAUSED->PLAYING state transition.
583 * Setting @time to #GST_CLOCK_TIME_NONE will disable the pipeline's management
584 * of element base time. The application will then be responsible for
585 * performing base time distribution. This is sometimes useful if you want to
586 * synchronize capture from multiple pipelines, and you can also ensure that the
587 * pipelines have the same clock.
592 gst_pipeline_set_new_stream_time (GstPipeline * pipeline, GstClockTime time)
594 g_return_if_fail (GST_IS_PIPELINE (pipeline));
596 GST_OBJECT_LOCK (pipeline);
597 pipeline->stream_time = time;
598 pipeline->priv->update_stream_time = TRUE;
599 GST_OBJECT_UNLOCK (pipeline);
601 GST_DEBUG_OBJECT (pipeline, "set new stream_time to %" GST_TIME_FORMAT,
602 GST_TIME_ARGS (time));
604 if (time == GST_CLOCK_TIME_NONE)
605 GST_DEBUG_OBJECT (pipeline, "told not to adjust base_time");
609 * gst_pipeline_get_last_stream_time:
610 * @pipeline: a #GstPipeline
612 * Gets the last stream time of @pipeline. If the pipeline is PLAYING,
613 * the returned time is the stream time used to configure the element's
614 * base time in the PAUSED->PLAYING state. If the pipeline is PAUSED, the
615 * returned time is the stream time when the pipeline was paused.
617 * This function returns #GST_CLOCK_TIME_NONE if the pipeline was
618 * configured to not handle the management of the element's base time
619 * (see gst_pipeline_set_new_stream_time()).
621 * Returns: a #GstClockTime.
626 gst_pipeline_get_last_stream_time (GstPipeline * pipeline)
630 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
632 GST_OBJECT_LOCK (pipeline);
633 result = pipeline->stream_time;
634 GST_OBJECT_UNLOCK (pipeline);
640 gst_pipeline_provide_clock_func (GstElement * element)
642 GstClock *clock = NULL;
643 GstPipeline *pipeline = GST_PIPELINE (element);
645 /* if we have a fixed clock, use that one */
646 GST_OBJECT_LOCK (pipeline);
647 if (GST_OBJECT_FLAG_IS_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK)) {
648 clock = pipeline->fixed_clock;
650 gst_object_ref (clock);
651 GST_OBJECT_UNLOCK (pipeline);
653 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)",
654 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
656 GST_OBJECT_UNLOCK (pipeline);
657 /* let the parent bin select a clock */
659 GST_ELEMENT_CLASS (parent_class)->
660 provide_clock (GST_ELEMENT (pipeline));
661 /* no clock, use a system clock */
663 clock = gst_system_clock_obtain ();
665 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained system clock: %p (%s)",
666 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
668 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained clock: %p (%s)",
669 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
676 * gst_pipeline_get_clock:
677 * @pipeline: a #GstPipeline
679 * Gets the current clock used by @pipeline.
681 * Returns: a #GstClock, unref after usage.
684 gst_pipeline_get_clock (GstPipeline * pipeline)
686 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), NULL);
688 return gst_pipeline_provide_clock_func (GST_ELEMENT (pipeline));
693 * gst_pipeline_use_clock:
694 * @pipeline: a #GstPipeline
695 * @clock: the clock to use
697 * Force @pipeline to use the given @clock. The pipeline will
698 * always use the given clock even if new clock providers are added
701 * If @clock is NULL all clocking will be disabled which will make
702 * the pipeline run as fast as possible.
707 gst_pipeline_use_clock (GstPipeline * pipeline, GstClock * clock)
711 g_return_if_fail (GST_IS_PIPELINE (pipeline));
713 GST_OBJECT_LOCK (pipeline);
714 GST_OBJECT_FLAG_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
716 clock_p = &pipeline->fixed_clock;
717 gst_object_replace ((GstObject **) clock_p, (GstObject *) clock);
718 GST_OBJECT_UNLOCK (pipeline);
720 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)", clock,
721 (clock ? GST_OBJECT_NAME (clock) : "nil"));
725 * gst_pipeline_set_clock:
726 * @pipeline: a #GstPipeline
727 * @clock: the clock to set
729 * Set the clock for @pipeline. The clock will be distributed
730 * to all the elements managed by the pipeline.
732 * Returns: TRUE if the clock could be set on the pipeline. FALSE if
733 * some element did not accept the clock.
738 gst_pipeline_set_clock (GstPipeline * pipeline, GstClock * clock)
740 g_return_val_if_fail (pipeline != NULL, FALSE);
741 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), FALSE);
743 return GST_ELEMENT_CLASS (parent_class)->set_clock (GST_ELEMENT (pipeline),
748 * gst_pipeline_auto_clock:
749 * @pipeline: a #GstPipeline
751 * Let @pipeline select a clock automatically. This is the default
754 * Use this function if you previous forced a fixed clock with
755 * gst_pipeline_use_clock() and want to restore the default
756 * pipeline clock selection algorithm.
761 gst_pipeline_auto_clock (GstPipeline * pipeline)
765 g_return_if_fail (pipeline != NULL);
766 g_return_if_fail (GST_IS_PIPELINE (pipeline));
768 GST_OBJECT_LOCK (pipeline);
769 GST_OBJECT_FLAG_UNSET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
771 clock_p = &pipeline->fixed_clock;
772 gst_object_replace ((GstObject **) clock_p, NULL);
773 GST_OBJECT_UNLOCK (pipeline);
775 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using automatic clock");
779 * gst_pipeline_set_delay:
780 * @pipeline: a #GstPipeline
783 * Set the expected delay needed for all elements to perform the
784 * PAUSED to PLAYING state change. @delay will be added to the
785 * base time of the elements so that they wait an additional @delay
786 * amount of time before starting to process buffers and cannot be
787 * #GST_CLOCK_TIME_NONE.
789 * This option is used for tuning purposes and should normally not be
797 gst_pipeline_set_delay (GstPipeline * pipeline, GstClockTime delay)
799 g_return_if_fail (GST_IS_PIPELINE (pipeline));
800 g_return_if_fail (delay != GST_CLOCK_TIME_NONE);
802 GST_OBJECT_LOCK (pipeline);
803 pipeline->delay = delay;
804 GST_OBJECT_UNLOCK (pipeline);
808 * gst_pipeline_get_delay:
809 * @pipeline: a #GstPipeline
811 * Get the configured delay (see gst_pipeline_set_delay()).
813 * Returns: The configured delay.
820 gst_pipeline_get_delay (GstPipeline * pipeline)
824 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
826 GST_OBJECT_LOCK (pipeline);
827 res = pipeline->delay;
828 GST_OBJECT_UNLOCK (pipeline);
834 * gst_pipeline_set_auto_flush_bus:
835 * @pipeline: a #GstPipeline
836 * @auto_flush: whether or not to automatically flush the bus when
837 * the pipeline goes from READY to NULL state
839 * Usually, when a pipeline goes from READY to NULL state, it automatically
840 * flushes all pending messages on the bus, which is done for refcounting
841 * purposes, to break circular references.
843 * This means that applications that update state using (async) bus messages
844 * (e.g. do certain things when a pipeline goes from PAUSED to READY) might
845 * not get to see messages when the pipeline is shut down, because they might
846 * be flushed before they can be dispatched in the main thread. This behaviour
847 * can be disabled using this function.
849 * It is important that all messages on the bus are handled when the
850 * automatic flushing is disabled else memory leaks will be introduced.
857 gst_pipeline_set_auto_flush_bus (GstPipeline * pipeline, gboolean auto_flush)
859 g_return_if_fail (GST_IS_PIPELINE (pipeline));
861 GST_OBJECT_LOCK (pipeline);
862 pipeline->priv->auto_flush_bus = auto_flush;
863 GST_OBJECT_UNLOCK (pipeline);
867 * gst_pipeline_get_auto_flush_bus:
868 * @pipeline: a #GstPipeline
870 * Check if @pipeline will automatically flush messages when going to
873 * Returns: whether the pipeline will automatically flush its bus when
874 * going from READY to NULL state or not.
881 gst_pipeline_get_auto_flush_bus (GstPipeline * pipeline)
885 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), FALSE);
887 GST_OBJECT_LOCK (pipeline);
888 res = pipeline->priv->auto_flush_bus;
889 GST_OBJECT_UNLOCK (pipeline);