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_base_init (gpointer g_class);
132 static void gst_pipeline_class_init (gpointer g_class, gpointer class_data);
133 static void gst_pipeline_init (GTypeInstance * instance, gpointer g_class);
135 static void gst_pipeline_dispose (GObject * object);
136 static void gst_pipeline_set_property (GObject * object, guint prop_id,
137 const GValue * value, GParamSpec * pspec);
138 static void gst_pipeline_get_property (GObject * object, guint prop_id,
139 GValue * value, GParamSpec * pspec);
141 static GstClock *gst_pipeline_provide_clock_func (GstElement * element);
142 static GstStateChangeReturn gst_pipeline_change_state (GstElement * element,
143 GstStateChange transition);
145 static void gst_pipeline_handle_message (GstBin * bin, GstMessage * message);
147 static GstBinClass *parent_class = NULL;
149 /* static guint gst_pipeline_signals[LAST_SIGNAL] = { 0 }; */
152 gst_pipeline_get_type (void)
154 static GType pipeline_type = 0;
156 if (G_UNLIKELY (pipeline_type == 0)) {
157 static const GTypeInfo pipeline_info = {
158 sizeof (GstPipelineClass),
159 gst_pipeline_base_init,
161 (GClassInitFunc) gst_pipeline_class_init,
164 sizeof (GstPipeline),
171 g_type_register_static (GST_TYPE_BIN, "GstPipeline", &pipeline_info, 0);
173 GST_DEBUG_CATEGORY_INIT (pipeline_debug, "pipeline", GST_DEBUG_BOLD,
174 "debugging info for the 'pipeline' container element");
176 return pipeline_type;
180 gst_pipeline_base_init (gpointer g_class)
182 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
184 gst_element_class_set_details (gstelement_class, &gst_pipeline_details);
188 gst_pipeline_class_init (gpointer g_class, gpointer class_data)
190 GObjectClass *gobject_class = G_OBJECT_CLASS (g_class);
191 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
192 GstBinClass *gstbin_class = GST_BIN_CLASS (g_class);
193 GstPipelineClass *klass = GST_PIPELINE_CLASS (g_class);
195 parent_class = g_type_class_peek_parent (klass);
197 g_type_class_add_private (klass, sizeof (GstPipelinePrivate));
199 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_pipeline_set_property);
200 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_pipeline_get_property);
205 * The expected delay needed for elements to spin up to the
206 * PLAYING state expressed in nanoseconds.
207 * see gst_pipeline_set_delay() for more information on this option.
211 g_object_class_install_property (gobject_class, PROP_DELAY,
212 g_param_spec_uint64 ("delay", "Delay",
213 "Expected delay needed for elements "
214 "to spin up to PLAYING in nanoseconds", 0, G_MAXUINT64, DEFAULT_DELAY,
218 * GstPipeline:auto-flush-bus:
220 * Whether or not to automatically flush all messages on the
221 * pipeline's bus when going from READY to NULL state. Please see
222 * gst_pipeline_set_auto_flush_bus() for more information on this option.
226 g_object_class_install_property (gobject_class, PROP_AUTO_FLUSH_BUS,
227 g_param_spec_boolean ("auto-flush-bus", "Auto Flush Bus",
228 "Whether to automatically flush the pipeline's bus when going "
229 "from READY into NULL state", DEFAULT_AUTO_FLUSH_BUS,
232 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pipeline_dispose);
234 gstelement_class->change_state =
235 GST_DEBUG_FUNCPTR (gst_pipeline_change_state);
236 gstelement_class->provide_clock =
237 GST_DEBUG_FUNCPTR (gst_pipeline_provide_clock_func);
239 gstbin_class->handle_message =
240 GST_DEBUG_FUNCPTR (gst_pipeline_handle_message);
244 gst_pipeline_init (GTypeInstance * instance, gpointer g_class)
246 GstPipeline *pipeline = GST_PIPELINE (instance);
249 pipeline->priv = GST_PIPELINE_GET_PRIVATE (pipeline);
251 /* set default property values */
252 pipeline->priv->auto_flush_bus = DEFAULT_AUTO_FLUSH_BUS;
253 pipeline->delay = DEFAULT_DELAY;
255 /* create and set a default bus */
256 bus = gst_bus_new ();
258 /* FIXME, disabled for 0.10.5 release as it caused to many regressions */
259 /* Start our bus in flushing if appropriate */
260 if (pipeline->priv->auto_flush_bus)
261 gst_bus_set_flushing (bus, TRUE);
264 gst_element_set_bus (GST_ELEMENT_CAST (pipeline), bus);
265 GST_DEBUG_OBJECT (pipeline, "set bus %" GST_PTR_FORMAT " on pipeline", bus);
266 gst_object_unref (bus);
270 gst_pipeline_dispose (GObject * object)
272 GstPipeline *pipeline = GST_PIPELINE (object);
273 GstClock **clock_p = &pipeline->fixed_clock;
275 GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pipeline, "dispose");
277 /* clear and unref any fixed clock */
278 gst_object_replace ((GstObject **) clock_p, NULL);
280 G_OBJECT_CLASS (parent_class)->dispose (object);
284 gst_pipeline_set_property (GObject * object, guint prop_id,
285 const GValue * value, GParamSpec * pspec)
287 GstPipeline *pipeline = GST_PIPELINE (object);
291 gst_pipeline_set_delay (pipeline, g_value_get_uint64 (value));
293 case PROP_AUTO_FLUSH_BUS:
294 gst_pipeline_set_auto_flush_bus (pipeline, g_value_get_boolean (value));
297 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
303 gst_pipeline_get_property (GObject * object, guint prop_id,
304 GValue * value, GParamSpec * pspec)
306 GstPipeline *pipeline = GST_PIPELINE (object);
310 g_value_set_uint64 (value, gst_pipeline_get_delay (pipeline));
312 case PROP_AUTO_FLUSH_BUS:
313 g_value_set_boolean (value, gst_pipeline_get_auto_flush_bus (pipeline));
316 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
321 /* set the stream time to 0 */
323 reset_stream_time (GstPipeline * pipeline)
325 GST_OBJECT_LOCK (pipeline);
326 if (pipeline->stream_time != GST_CLOCK_TIME_NONE) {
327 GST_DEBUG_OBJECT (pipeline, "reset stream_time to 0");
328 pipeline->stream_time = 0;
329 pipeline->priv->update_stream_time = TRUE;
331 GST_DEBUG_OBJECT (pipeline, "application asked to not reset stream_time");
333 GST_OBJECT_UNLOCK (pipeline);
338 * @name: name of new pipeline
340 * Create a new pipeline with the given name.
342 * Returns: newly created GstPipeline
347 gst_pipeline_new (const gchar * name)
349 return gst_element_factory_make ("pipeline", name);
353 static GstStateChangeReturn
354 gst_pipeline_change_state (GstElement * element, GstStateChange transition)
356 GstStateChangeReturn result = GST_STATE_CHANGE_SUCCESS;
357 GstPipeline *pipeline = GST_PIPELINE (element);
360 switch (transition) {
361 case GST_STATE_CHANGE_NULL_TO_READY:
362 GST_OBJECT_LOCK (element);
364 gst_bus_set_flushing (element->bus, FALSE);
365 GST_OBJECT_UNLOCK (element);
367 case GST_STATE_CHANGE_READY_TO_PAUSED:
368 GST_OBJECT_LOCK (element);
369 pipeline->priv->update_clock = TRUE;
370 GST_OBJECT_UNLOCK (element);
372 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
374 GstClockTime new_base_time;
376 GstClockTime min_latency, max_latency;
377 GstClockTime start_time, stream_time, delay;
378 gboolean new_clock, update_stream_time, update_clock;
382 GST_DEBUG_OBJECT (element, "selecting clock and base_time");
384 GST_OBJECT_LOCK (element);
385 cur_clock = element->clock;
387 gst_object_ref (cur_clock);
388 stream_time = pipeline->stream_time;
389 update_stream_time = pipeline->priv->update_stream_time;
390 update_clock = pipeline->priv->update_clock;
391 pipeline->priv->update_stream_time = FALSE;
392 pipeline->priv->update_clock = FALSE;
393 delay = pipeline->delay;
394 GST_OBJECT_UNLOCK (element);
396 /* stream time changed, either with a PAUSED or a flush, we need to check
397 * if there is a new clock & update the base time */
398 if (update_stream_time) {
399 GST_DEBUG_OBJECT (pipeline, "Need to update stream_time");
401 /* when going to PLAYING, select a clock when needed. If we just got
402 * flushed, we don't reselect the clock. */
404 GST_DEBUG_OBJECT (pipeline, "Need to update clock.");
405 clock = gst_element_provide_clock (element);
407 GST_DEBUG_OBJECT (pipeline,
408 "Don't need to update clock, using old clock.");
409 clock = gst_object_ref (cur_clock);
412 new_clock = (clock != cur_clock);
415 start_time = gst_clock_get_time (clock);
417 GST_DEBUG ("no clock, using base time of NONE");
418 start_time = GST_CLOCK_TIME_NONE;
419 new_base_time = GST_CLOCK_TIME_NONE;
423 /* now distribute the clock (which could be NULL). If some
424 * element refuses the clock, this will return FALSE and
425 * we effectively fail the state change. */
426 if (!gst_element_set_clock (element, clock))
429 /* if we selected and distributed a new clock, let the app
431 gst_element_post_message (element,
432 gst_message_new_new_clock (GST_OBJECT_CAST (element), clock));
436 gst_object_unref (clock);
438 if (stream_time != GST_CLOCK_TIME_NONE
439 && start_time != GST_CLOCK_TIME_NONE) {
440 new_base_time = start_time - stream_time + delay;
441 GST_DEBUG_OBJECT (element,
442 "stream_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
443 ", base_time %" GST_TIME_FORMAT,
444 GST_TIME_ARGS (stream_time), GST_TIME_ARGS (start_time),
445 GST_TIME_ARGS (new_base_time));
447 new_base_time = GST_CLOCK_TIME_NONE;
449 if (new_base_time != GST_CLOCK_TIME_NONE)
450 gst_element_set_base_time (element, new_base_time);
452 GST_DEBUG_OBJECT (pipeline,
453 "NOT adjusting base_time because stream_time is NONE");
455 GST_DEBUG_OBJECT (pipeline,
456 "NOT adjusting base_time because we selected one before");
460 gst_object_unref (cur_clock);
462 /* determine latency in this pipeline */
463 GST_DEBUG_OBJECT (element, "querying pipeline latency");
464 query = gst_query_new_latency ();
465 if (gst_element_query (element, query)) {
468 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
470 GST_DEBUG_OBJECT (element,
471 "configuring min latency %" GST_TIME_FORMAT ", max latency %"
472 GST_TIME_FORMAT ", live %d", GST_TIME_ARGS (min_latency),
473 GST_TIME_ARGS (max_latency), live);
475 /* configure latency on elements */
477 gst_element_send_event (element,
478 gst_event_new_latency (min_latency));
480 GST_INFO_OBJECT (element, "configured latency of %" GST_TIME_FORMAT,
481 GST_TIME_ARGS (min_latency));
483 GST_WARNING_OBJECT (element,
484 "failed to configure latency of %" GST_TIME_FORMAT,
485 GST_TIME_ARGS (min_latency));
486 GST_ELEMENT_WARNING (element, CORE, CLOCK, (NULL),
487 ("Failed to configure latency of %" GST_TIME_FORMAT,
488 GST_TIME_ARGS (min_latency)));
491 /* this is not a real problem, we just don't configure any latency. */
492 GST_WARNING_OBJECT (element, "failed to query pipeline latency");
494 gst_query_unref (query);
497 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
499 case GST_STATE_CHANGE_PAUSED_TO_READY:
500 case GST_STATE_CHANGE_READY_TO_NULL:
504 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
506 switch (transition) {
507 case GST_STATE_CHANGE_NULL_TO_READY:
509 case GST_STATE_CHANGE_READY_TO_PAUSED:
511 reset_stream_time (pipeline);
514 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
516 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
517 GST_OBJECT_LOCK (element);
518 if ((clock = element->clock)) {
521 gst_object_ref (clock);
522 GST_OBJECT_UNLOCK (element);
524 /* calculate the time when we stopped */
525 now = gst_clock_get_time (clock);
526 gst_object_unref (clock);
528 GST_OBJECT_LOCK (element);
529 /* store the current stream time */
530 if (pipeline->stream_time != GST_CLOCK_TIME_NONE) {
531 pipeline->stream_time = now - element->base_time;
532 /* we went to PAUSED, when going to PLAYING select clock and new
534 pipeline->priv->update_stream_time = TRUE;
535 pipeline->priv->update_clock = TRUE;
538 GST_DEBUG_OBJECT (element,
539 "stream_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
540 ", base_time %" GST_TIME_FORMAT,
541 GST_TIME_ARGS (pipeline->stream_time), GST_TIME_ARGS (now),
542 GST_TIME_ARGS (element->base_time));
544 GST_OBJECT_UNLOCK (element);
546 case GST_STATE_CHANGE_PAUSED_TO_READY:
548 case GST_STATE_CHANGE_READY_TO_NULL:
549 GST_OBJECT_LOCK (element);
551 if (pipeline->priv->auto_flush_bus) {
552 gst_bus_set_flushing (element->bus, TRUE);
554 GST_INFO_OBJECT (element, "not flushing bus, auto-flushing disabled");
557 GST_OBJECT_UNLOCK (element);
565 /* we generate this error when the selected clock was not
566 * accepted by some element */
567 GST_ELEMENT_ERROR (pipeline, CORE, CLOCK,
568 (_("Selected clock cannot be used in pipeline.")),
569 ("Pipeline cannot operate with selected clock"));
570 GST_DEBUG_OBJECT (pipeline,
571 "Pipeline cannot operate with selected clock %p", clock);
573 gst_object_unref (clock);
574 return GST_STATE_CHANGE_FAILURE;
579 gst_pipeline_handle_message (GstBin * bin, GstMessage * message)
581 GstPipeline *pipeline = GST_PIPELINE_CAST (bin);
583 switch (GST_MESSAGE_TYPE (message)) {
584 case GST_MESSAGE_ASYNC_START:
586 gboolean new_base_time;
588 gst_message_parse_async_start (message, &new_base_time);
590 /* reset our stream time if we need to distribute a new base_time to the
593 reset_stream_time (pipeline);
600 GST_BIN_CLASS (parent_class)->handle_message (bin, message);
605 * gst_pipeline_get_bus:
606 * @pipeline: a #GstPipeline
608 * Gets the #GstBus of @pipeline.
610 * Returns: a #GstBus, unref after usage.
615 gst_pipeline_get_bus (GstPipeline * pipeline)
617 return gst_element_get_bus (GST_ELEMENT (pipeline));
621 * gst_pipeline_set_new_stream_time:
622 * @pipeline: a #GstPipeline
623 * @time: the new stream time to set
625 * Set the new stream time of @pipeline to @time. The stream time is used to
626 * set the base time on the elements (see gst_element_set_base_time())
627 * in the PAUSED->PLAYING state transition.
629 * Setting @time to #GST_CLOCK_TIME_NONE will disable the pipeline's management
630 * of element base time. The application will then be responsible for
631 * performing base time distribution. This is sometimes useful if you want to
632 * synchronize capture from multiple pipelines, and you can also ensure that the
633 * pipelines have the same clock.
638 gst_pipeline_set_new_stream_time (GstPipeline * pipeline, GstClockTime time)
640 g_return_if_fail (GST_IS_PIPELINE (pipeline));
642 GST_OBJECT_LOCK (pipeline);
643 pipeline->stream_time = time;
644 pipeline->priv->update_stream_time = TRUE;
645 GST_OBJECT_UNLOCK (pipeline);
647 GST_DEBUG_OBJECT (pipeline, "set new stream_time to %" GST_TIME_FORMAT,
648 GST_TIME_ARGS (time));
650 if (time == GST_CLOCK_TIME_NONE)
651 GST_DEBUG_OBJECT (pipeline, "told not to adjust base_time");
655 * gst_pipeline_get_last_stream_time:
656 * @pipeline: a #GstPipeline
658 * Gets the last stream time of @pipeline. If the pipeline is PLAYING,
659 * the returned time is the stream time used to configure the element's
660 * base time in the PAUSED->PLAYING state. If the pipeline is PAUSED, the
661 * returned time is the stream time when the pipeline was paused.
663 * This function returns #GST_CLOCK_TIME_NONE if the pipeline was
664 * configured to not handle the management of the element's base time
665 * (see gst_pipeline_set_new_stream_time()).
667 * Returns: a #GstClockTime.
672 gst_pipeline_get_last_stream_time (GstPipeline * pipeline)
676 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
678 GST_OBJECT_LOCK (pipeline);
679 result = pipeline->stream_time;
680 GST_OBJECT_UNLOCK (pipeline);
686 gst_pipeline_provide_clock_func (GstElement * element)
688 GstClock *clock = NULL;
689 GstPipeline *pipeline = GST_PIPELINE (element);
691 /* if we have a fixed clock, use that one */
692 GST_OBJECT_LOCK (pipeline);
693 if (GST_OBJECT_FLAG_IS_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK)) {
694 clock = pipeline->fixed_clock;
696 gst_object_ref (clock);
697 GST_OBJECT_UNLOCK (pipeline);
699 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)",
700 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
702 GST_OBJECT_UNLOCK (pipeline);
703 /* let the parent bin select a clock */
705 GST_ELEMENT_CLASS (parent_class)->
706 provide_clock (GST_ELEMENT (pipeline));
707 /* no clock, use a system clock */
709 clock = gst_system_clock_obtain ();
711 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained system clock: %p (%s)",
712 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
714 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained clock: %p (%s)",
715 clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-");
722 * gst_pipeline_get_clock:
723 * @pipeline: a #GstPipeline
725 * Gets the current clock used by @pipeline.
727 * Returns: a #GstClock, unref after usage.
730 gst_pipeline_get_clock (GstPipeline * pipeline)
732 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), NULL);
734 return gst_pipeline_provide_clock_func (GST_ELEMENT (pipeline));
739 * gst_pipeline_use_clock:
740 * @pipeline: a #GstPipeline
741 * @clock: the clock to use
743 * Force @pipeline to use the given @clock. The pipeline will
744 * always use the given clock even if new clock providers are added
747 * If @clock is NULL all clocking will be disabled which will make
748 * the pipeline run as fast as possible.
753 gst_pipeline_use_clock (GstPipeline * pipeline, GstClock * clock)
757 g_return_if_fail (GST_IS_PIPELINE (pipeline));
759 GST_OBJECT_LOCK (pipeline);
760 GST_OBJECT_FLAG_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
762 clock_p = &pipeline->fixed_clock;
763 gst_object_replace ((GstObject **) clock_p, (GstObject *) clock);
764 GST_OBJECT_UNLOCK (pipeline);
766 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)", clock,
767 (clock ? GST_OBJECT_NAME (clock) : "nil"));
771 * gst_pipeline_set_clock:
772 * @pipeline: a #GstPipeline
773 * @clock: the clock to set
775 * Set the clock for @pipeline. The clock will be distributed
776 * to all the elements managed by the pipeline.
778 * Returns: TRUE if the clock could be set on the pipeline. FALSE if
779 * some element did not accept the clock.
784 gst_pipeline_set_clock (GstPipeline * pipeline, GstClock * clock)
786 g_return_val_if_fail (pipeline != NULL, FALSE);
787 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), FALSE);
789 return GST_ELEMENT_CLASS (parent_class)->set_clock (GST_ELEMENT (pipeline),
794 * gst_pipeline_auto_clock:
795 * @pipeline: a #GstPipeline
797 * Let @pipeline select a clock automatically. This is the default
800 * Use this function if you previous forced a fixed clock with
801 * gst_pipeline_use_clock() and want to restore the default
802 * pipeline clock selection algorithm.
807 gst_pipeline_auto_clock (GstPipeline * pipeline)
811 g_return_if_fail (pipeline != NULL);
812 g_return_if_fail (GST_IS_PIPELINE (pipeline));
814 GST_OBJECT_LOCK (pipeline);
815 GST_OBJECT_FLAG_UNSET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK);
817 clock_p = &pipeline->fixed_clock;
818 gst_object_replace ((GstObject **) clock_p, NULL);
819 GST_OBJECT_UNLOCK (pipeline);
821 GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using automatic clock");
825 * gst_pipeline_set_delay:
826 * @pipeline: a #GstPipeline
829 * Set the expected delay needed for all elements to perform the
830 * PAUSED to PLAYING state change. @delay will be added to the
831 * base time of the elements so that they wait an additional @delay
832 * amount of time before starting to process buffers and cannot be
833 * #GST_CLOCK_TIME_NONE.
835 * This option is used for tuning purposes and should normally not be
843 gst_pipeline_set_delay (GstPipeline * pipeline, GstClockTime delay)
845 g_return_if_fail (GST_IS_PIPELINE (pipeline));
846 g_return_if_fail (delay != GST_CLOCK_TIME_NONE);
848 GST_OBJECT_LOCK (pipeline);
849 pipeline->delay = delay;
850 GST_OBJECT_UNLOCK (pipeline);
854 * gst_pipeline_get_delay:
855 * @pipeline: a #GstPipeline
857 * Get the configured delay (see gst_pipeline_set_delay()).
859 * Returns: The configured delay.
866 gst_pipeline_get_delay (GstPipeline * pipeline)
870 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
872 GST_OBJECT_LOCK (pipeline);
873 res = pipeline->delay;
874 GST_OBJECT_UNLOCK (pipeline);
880 * gst_pipeline_set_auto_flush_bus:
881 * @pipeline: a #GstPipeline
882 * @auto_flush: whether or not to automatically flush the bus when
883 * the pipeline goes from READY to NULL state
885 * Usually, when a pipeline goes from READY to NULL state, it automatically
886 * flushes all pending messages on the bus, which is done for refcounting
887 * purposes, to break circular references.
889 * This means that applications that update state using (async) bus messages
890 * (e.g. do certain things when a pipeline goes from PAUSED to READY) might
891 * not get to see messages when the pipeline is shut down, because they might
892 * be flushed before they can be dispatched in the main thread. This behaviour
893 * can be disabled using this function.
895 * It is important that all messages on the bus are handled when the
896 * automatic flushing is disabled else memory leaks will be introduced.
903 gst_pipeline_set_auto_flush_bus (GstPipeline * pipeline, gboolean auto_flush)
905 g_return_if_fail (GST_IS_PIPELINE (pipeline));
907 GST_OBJECT_LOCK (pipeline);
908 pipeline->priv->auto_flush_bus = auto_flush;
909 GST_OBJECT_UNLOCK (pipeline);
913 * gst_pipeline_get_auto_flush_bus:
914 * @pipeline: a #GstPipeline
916 * Check if @pipeline will automatically flush messages when going to
919 * Returns: whether the pipeline will automatically flush its bus when
920 * going from READY to NULL state or not.
927 gst_pipeline_get_auto_flush_bus (GstPipeline * pipeline)
931 g_return_val_if_fail (GST_IS_PIPELINE (pipeline), FALSE);
933 GST_OBJECT_LOCK (pipeline);
934 res = pipeline->priv->auto_flush_bus;
935 GST_OBJECT_UNLOCK (pipeline);