/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2004,2005 Wim Taymans * * gstpipeline.c: Overall pipeline management element * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:gstpipeline * @short_description: Top-level bin with clocking and bus management functionality. * @see_also: #GstElement, #GstBin, #GstClock, #GstBus * * A #GstPipeline is a special #GstBin used as the toplevel container for * the filter graph. The #GstPipeline will manage the selection and * distribution of a global #GstClock as well as provide a #GstBus to the * application. It will also implement a default behavour for managing * seek events (see gst_element_seek()). * * gst_pipeline_new() is used to create a pipeline. when you are done with * the pipeline, use gst_object_unref() to free its resources including all * added #GstElement objects (if not otherwise referenced). * * Elements are added and removed from the pipeline using the #GstBin * methods like gst_bin_add() and gst_bin_remove() (see #GstBin). * * Before changing the state of the #GstPipeline (see #GstElement) a #GstBus * can be retrieved with gst_pipeline_get_bus(). This bus can then be * used to receive #GstMessage from the elements in the pipeline. * * By default, a #GstPipeline will automatically flush the pending #GstBus * messages when going to the NULL state to ensure that no circular * references exist when no messages are read from the #GstBus. This * behaviour can be changed with gst_pipeline_set_auto_flush_bus(). * * When the #GstPipeline performs the PAUSED to PLAYING state change it will * select a clock for the elements. The clock selection algorithm will by * default select a clock provided by an element that is most upstream * (closest to the source). For live pipelines (ones that return * #GST_STATE_CHANGE_NO_PREROLL from the gst_element_set_state() call) this * will select the clock provided by the live source. For normal pipelines * this will select a clock provided by the sinks (most likely the audio * sink). If no element provides a clock, a default #GstSystemClock is used. * * The clock selection can be controlled with the gst_pipeline_use_clock() * method, which will enforce a given clock on the pipeline. With * gst_pipeline_auto_clock() the default clock selection algorithm can be * restored. * * A #GstPipeline maintains a running time for the elements. The running * time is defined as the difference between the current clock time and * the base time. When the pipeline goes to READY or a flushing seek is * performed on it, the running time is reset to 0. When the pipeline is * set from PLAYING to PAUSED, the current clock time is sampled and used to * configure the base time for the elements when the pipeline is set * to PLAYING again. The effect is that the running time (as the difference * between the clock time and the base time) will count how much time was spent * in the PLAYING state. This default behaviour can be changed with the * gst_element_set_start_time() method. * * When sending a flushing seek event to a GstPipeline (see * gst_element_seek()), it will make sure that the pipeline is properly * PAUSED and resumed as well as set the new running time to 0 when the * seek succeeded. * * Last reviewed on 2009-05-29 (0.10.24) */ #include "gst_private.h" #include "gsterror.h" #include "gst-i18n-lib.h" #include "gstpipeline.h" #include "gstinfo.h" #include "gstsystemclock.h" #include "gstutils.h" GST_DEBUG_CATEGORY_STATIC (pipeline_debug); #define GST_CAT_DEFAULT pipeline_debug /* Pipeline signals and args */ enum { /* FILL ME */ LAST_SIGNAL }; #define DEFAULT_DELAY 0 #define DEFAULT_AUTO_FLUSH_BUS TRUE enum { PROP_0, PROP_DELAY, PROP_AUTO_FLUSH_BUS }; #define GST_PIPELINE_GET_PRIVATE(obj) \ (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_PIPELINE, GstPipelinePrivate)) struct _GstPipelinePrivate { /* with LOCK */ gboolean auto_flush_bus; /* when we need to update stream_time or clock when going back to * PLAYING*/ GstClockTime last_start_time; gboolean update_clock; }; static void gst_pipeline_dispose (GObject * object); static void gst_pipeline_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_pipeline_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static GstClock *gst_pipeline_provide_clock_func (GstElement * element); static GstStateChangeReturn gst_pipeline_change_state (GstElement * element, GstStateChange transition); static void gst_pipeline_handle_message (GstBin * bin, GstMessage * message); /* static guint gst_pipeline_signals[LAST_SIGNAL] = { 0 }; */ #define _do_init \ { \ GST_DEBUG_CATEGORY_INIT (pipeline_debug, "pipeline", GST_DEBUG_BOLD, \ "debugging info for the 'pipeline' container element"); \ } #define gst_pipeline_parent_class parent_class G_DEFINE_TYPE_WITH_CODE (GstPipeline, gst_pipeline, GST_TYPE_BIN, _do_init); static void gst_pipeline_class_init (GstPipelineClass * klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass); GstBinClass *gstbin_class = GST_BIN_CLASS (klass); g_type_class_add_private (klass, sizeof (GstPipelinePrivate)); gobject_class->set_property = gst_pipeline_set_property; gobject_class->get_property = gst_pipeline_get_property; /** * GstPipeline:delay * * The expected delay needed for elements to spin up to the * PLAYING state expressed in nanoseconds. * see gst_pipeline_set_delay() for more information on this option. * * Since: 0.10.5 **/ g_object_class_install_property (gobject_class, PROP_DELAY, g_param_spec_uint64 ("delay", "Delay", "Expected delay needed for elements " "to spin up to PLAYING in nanoseconds", 0, G_MAXUINT64, DEFAULT_DELAY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstPipeline:auto-flush-bus: * * Whether or not to automatically flush all messages on the * pipeline's bus when going from READY to NULL state. Please see * gst_pipeline_set_auto_flush_bus() for more information on this option. * * Since: 0.10.4 **/ g_object_class_install_property (gobject_class, PROP_AUTO_FLUSH_BUS, g_param_spec_boolean ("auto-flush-bus", "Auto Flush Bus", "Whether to automatically flush the pipeline's bus when going " "from READY into NULL state", DEFAULT_AUTO_FLUSH_BUS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gobject_class->dispose = gst_pipeline_dispose; gst_element_class_set_metadata (gstelement_class, "Pipeline object", "Generic/Bin", "Complete pipeline object", "Erik Walthinsen , Wim Taymans "); gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_pipeline_change_state); gstelement_class->provide_clock = GST_DEBUG_FUNCPTR (gst_pipeline_provide_clock_func); gstbin_class->handle_message = GST_DEBUG_FUNCPTR (gst_pipeline_handle_message); } static void gst_pipeline_init (GstPipeline * pipeline) { GstBus *bus; pipeline->priv = GST_PIPELINE_GET_PRIVATE (pipeline); /* set default property values */ pipeline->priv->auto_flush_bus = DEFAULT_AUTO_FLUSH_BUS; pipeline->delay = DEFAULT_DELAY; /* create and set a default bus */ bus = gst_bus_new (); #if 0 /* FIXME, disabled for 0.10.5 release as it caused to many regressions */ /* Start our bus in flushing if appropriate */ if (pipeline->priv->auto_flush_bus) gst_bus_set_flushing (bus, TRUE); #endif gst_element_set_bus (GST_ELEMENT_CAST (pipeline), bus); GST_DEBUG_OBJECT (pipeline, "set bus %" GST_PTR_FORMAT " on pipeline", bus); gst_object_unref (bus); } static void gst_pipeline_dispose (GObject * object) { GstPipeline *pipeline = GST_PIPELINE (object); GstClock **clock_p = &pipeline->fixed_clock; GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pipeline, "dispose"); /* clear and unref any fixed clock */ gst_object_replace ((GstObject **) clock_p, NULL); G_OBJECT_CLASS (parent_class)->dispose (object); } static void gst_pipeline_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstPipeline *pipeline = GST_PIPELINE (object); switch (prop_id) { case PROP_DELAY: gst_pipeline_set_delay (pipeline, g_value_get_uint64 (value)); break; case PROP_AUTO_FLUSH_BUS: gst_pipeline_set_auto_flush_bus (pipeline, g_value_get_boolean (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_pipeline_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstPipeline *pipeline = GST_PIPELINE (object); switch (prop_id) { case PROP_DELAY: g_value_set_uint64 (value, gst_pipeline_get_delay (pipeline)); break; case PROP_AUTO_FLUSH_BUS: g_value_set_boolean (value, gst_pipeline_get_auto_flush_bus (pipeline)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } /* set the start_time to 0, this will cause us to select a new base_time and * make the running_time start from 0 again. */ static void reset_start_time (GstPipeline * pipeline) { GST_OBJECT_LOCK (pipeline); if (GST_ELEMENT_START_TIME (pipeline) != GST_CLOCK_TIME_NONE) { GST_DEBUG_OBJECT (pipeline, "reset start_time to 0"); GST_ELEMENT_START_TIME (pipeline) = 0; pipeline->priv->last_start_time = -1; } else { GST_DEBUG_OBJECT (pipeline, "application asked to not reset stream_time"); } GST_OBJECT_UNLOCK (pipeline); } /** * gst_pipeline_new: * @name: name of new pipeline * * Create a new pipeline with the given name. * * Returns: (transfer full): newly created GstPipeline * * MT safe. */ GstElement * gst_pipeline_new (const gchar * name) { return gst_element_factory_make ("pipeline", name); } /* takes a snapshot of the running_time of the pipeline and store this as the * element start_time. This is the time we will set as the running_time of the * pipeline when we go to PLAYING next. */ static void pipeline_update_start_time (GstElement * element) { GstPipeline *pipeline = GST_PIPELINE_CAST (element); GstClock *clock; GST_OBJECT_LOCK (element); if ((clock = element->clock)) { GstClockTime now; gst_object_ref (clock); GST_OBJECT_UNLOCK (element); /* calculate the time when we stopped */ now = gst_clock_get_time (clock); gst_object_unref (clock); GST_OBJECT_LOCK (element); /* store the current running time */ if (GST_ELEMENT_START_TIME (pipeline) != GST_CLOCK_TIME_NONE) { if (now != GST_CLOCK_TIME_NONE) GST_ELEMENT_START_TIME (pipeline) = now - element->base_time; else GST_WARNING_OBJECT (element, "Clock %s returned invalid time, can't calculate " "running_time when going to the PAUSED state", GST_OBJECT_NAME (clock)); /* we went to PAUSED, when going to PLAYING select clock and new * base_time */ pipeline->priv->update_clock = TRUE; } GST_DEBUG_OBJECT (element, "start_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT ", base_time %" GST_TIME_FORMAT, GST_TIME_ARGS (GST_ELEMENT_START_TIME (pipeline)), GST_TIME_ARGS (now), GST_TIME_ARGS (element->base_time)); } GST_OBJECT_UNLOCK (element); } /* MT safe */ static GstStateChangeReturn gst_pipeline_change_state (GstElement * element, GstStateChange transition) { GstStateChangeReturn result = GST_STATE_CHANGE_SUCCESS; GstPipeline *pipeline = GST_PIPELINE_CAST (element); GstClock *clock; switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: GST_OBJECT_LOCK (element); if (element->bus) gst_bus_set_flushing (element->bus, FALSE); GST_OBJECT_UNLOCK (element); break; case GST_STATE_CHANGE_READY_TO_PAUSED: GST_OBJECT_LOCK (element); pipeline->priv->update_clock = TRUE; GST_OBJECT_UNLOCK (element); break; case GST_STATE_CHANGE_PAUSED_TO_PLAYING: { GstClockTime now, start_time, last_start_time, delay; gboolean update_clock; GstClock *cur_clock; GST_DEBUG_OBJECT (element, "selecting clock and base_time"); GST_OBJECT_LOCK (element); cur_clock = element->clock; if (cur_clock) gst_object_ref (cur_clock); /* get the desired running_time of the first buffer aka the start_time */ start_time = GST_ELEMENT_START_TIME (pipeline); last_start_time = pipeline->priv->last_start_time; pipeline->priv->last_start_time = start_time; /* see if we need to update the clock */ update_clock = pipeline->priv->update_clock; pipeline->priv->update_clock = FALSE; delay = pipeline->delay; GST_OBJECT_UNLOCK (element); /* running time changed, either with a PAUSED or a flush, we need to check * if there is a new clock & update the base time */ if (update_clock || last_start_time != start_time) { GST_DEBUG_OBJECT (pipeline, "Need to update start_time"); /* when going to PLAYING, select a clock when needed. If we just got * flushed, we don't reselect the clock. */ if (update_clock) { GST_DEBUG_OBJECT (pipeline, "Need to update clock."); clock = gst_element_provide_clock (element); } else { GST_DEBUG_OBJECT (pipeline, "Don't need to update clock, using old clock."); clock = gst_object_ref (cur_clock); } if (clock) { now = gst_clock_get_time (clock); } else { GST_DEBUG ("no clock, using base time of NONE"); now = GST_CLOCK_TIME_NONE; } if (clock != cur_clock) { /* now distribute the clock (which could be NULL). If some * element refuses the clock, this will return FALSE and * we effectively fail the state change. */ if (!gst_element_set_clock (element, clock)) goto invalid_clock; /* if we selected and distributed a new clock, let the app * know about it */ gst_element_post_message (element, gst_message_new_new_clock (GST_OBJECT_CAST (element), clock)); } if (clock) gst_object_unref (clock); if (start_time != GST_CLOCK_TIME_NONE && now != GST_CLOCK_TIME_NONE) { GstClockTime new_base_time = now - start_time + delay; GST_DEBUG_OBJECT (element, "start_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT ", base_time %" GST_TIME_FORMAT, GST_TIME_ARGS (start_time), GST_TIME_ARGS (now), GST_TIME_ARGS (new_base_time)); gst_element_set_base_time (element, new_base_time); } else { GST_DEBUG_OBJECT (pipeline, "NOT adjusting base_time because start_time is NONE"); } } else { GST_DEBUG_OBJECT (pipeline, "NOT adjusting base_time because we selected one before"); } if (cur_clock) gst_object_unref (cur_clock); break; } case GST_STATE_CHANGE_PLAYING_TO_PAUSED: { /* we take a start_time snapshot before calling the children state changes * so that they know about when the pipeline PAUSED. */ pipeline_update_start_time (element); break; } case GST_STATE_CHANGE_PAUSED_TO_READY: case GST_STATE_CHANGE_READY_TO_NULL: break; } result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: break; case GST_STATE_CHANGE_READY_TO_PAUSED: { reset_start_time (pipeline); break; } case GST_STATE_CHANGE_PAUSED_TO_PLAYING: break; case GST_STATE_CHANGE_PLAYING_TO_PAUSED: { /* Take a new snapshot of the start_time after calling the state change on * all children. This will be the running_time of the pipeline when we go * back to PLAYING */ pipeline_update_start_time (element); break; } case GST_STATE_CHANGE_PAUSED_TO_READY: break; case GST_STATE_CHANGE_READY_TO_NULL: { GstBus *bus; gboolean auto_flush; /* grab some stuff before we release the lock to flush out the bus */ GST_OBJECT_LOCK (element); if ((bus = element->bus)) gst_object_ref (bus); auto_flush = pipeline->priv->auto_flush_bus; GST_OBJECT_UNLOCK (element); if (bus) { if (auto_flush) { gst_bus_set_flushing (bus, TRUE); } else { GST_INFO_OBJECT (element, "not flushing bus, auto-flushing disabled"); } gst_object_unref (bus); } break; } } return result; /* ERRORS */ invalid_clock: { /* we generate this error when the selected clock was not * accepted by some element */ GST_ELEMENT_ERROR (pipeline, CORE, CLOCK, (_("Selected clock cannot be used in pipeline.")), ("Pipeline cannot operate with selected clock")); GST_DEBUG_OBJECT (pipeline, "Pipeline cannot operate with selected clock %p", clock); if (clock) gst_object_unref (clock); return GST_STATE_CHANGE_FAILURE; } } /* intercept the bus messages from our children. We watch for the ASYNC_START * message with is posted by the elements (sinks) that require a reset of the * running_time after a flush. ASYNC_START also brings the pipeline back into * the PAUSED, pending PAUSED state. When the ASYNC_DONE message is received the * pipeline will redistribute the new base_time and will bring the elements back * to the desired state of the pipeline. */ static void gst_pipeline_handle_message (GstBin * bin, GstMessage * message) { GstPipeline *pipeline = GST_PIPELINE_CAST (bin); switch (GST_MESSAGE_TYPE (message)) { case GST_MESSAGE_ASYNC_START: { gboolean new_base_time; gst_message_parse_async_start (message, &new_base_time); /* reset our running time if we need to distribute a new base_time to the * children. */ if (new_base_time) reset_start_time (pipeline); break; } case GST_MESSAGE_CLOCK_LOST: { GstClock *clock; gst_message_parse_clock_lost (message, &clock); GST_OBJECT_LOCK (bin); if (clock == GST_ELEMENT_CAST (bin)->clock) { GST_DEBUG_OBJECT (bin, "Used clock '%s' got lost", GST_OBJECT_NAME (clock)); pipeline->priv->update_clock = TRUE; } GST_OBJECT_UNLOCK (bin); } default: break; } GST_BIN_CLASS (parent_class)->handle_message (bin, message); } /** * gst_pipeline_get_bus: * @pipeline: a #GstPipeline * * Gets the #GstBus of @pipeline. The bus allows applications to receive * #GstMessage packets. * * Returns: (transfer full): a #GstBus, unref after usage. * * MT safe. */ GstBus * gst_pipeline_get_bus (GstPipeline * pipeline) { return gst_element_get_bus (GST_ELEMENT_CAST (pipeline)); } static GstClock * gst_pipeline_provide_clock_func (GstElement * element) { GstClock *clock = NULL; GstPipeline *pipeline = GST_PIPELINE (element); /* if we have a fixed clock, use that one */ GST_OBJECT_LOCK (pipeline); if (GST_OBJECT_FLAG_IS_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK)) { clock = pipeline->fixed_clock; if (clock) gst_object_ref (clock); GST_OBJECT_UNLOCK (pipeline); GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)", clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-"); } else { GST_OBJECT_UNLOCK (pipeline); /* let the parent bin select a clock */ clock = GST_ELEMENT_CLASS (parent_class)->provide_clock (GST_ELEMENT (pipeline)); /* no clock, use a system clock */ if (!clock) { clock = gst_system_clock_obtain (); GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained system clock: %p (%s)", clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-"); } else { GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline obtained clock: %p (%s)", clock, clock ? GST_STR_NULL (GST_OBJECT_NAME (clock)) : "-"); } } return clock; } /** * gst_pipeline_get_clock: * @pipeline: a #GstPipeline * * Gets the current clock used by @pipeline. * * Returns: (transfer full): a #GstClock, unref after usage. */ GstClock * gst_pipeline_get_clock (GstPipeline * pipeline) { g_return_val_if_fail (GST_IS_PIPELINE (pipeline), NULL); return gst_pipeline_provide_clock_func (GST_ELEMENT_CAST (pipeline)); } /** * gst_pipeline_use_clock: * @pipeline: a #GstPipeline * @clock: (transfer none): the clock to use * * Force @pipeline to use the given @clock. The pipeline will * always use the given clock even if new clock providers are added * to this pipeline. * * If @clock is NULL all clocking will be disabled which will make * the pipeline run as fast as possible. * * MT safe. */ void gst_pipeline_use_clock (GstPipeline * pipeline, GstClock * clock) { GstClock **clock_p; g_return_if_fail (GST_IS_PIPELINE (pipeline)); GST_OBJECT_LOCK (pipeline); GST_OBJECT_FLAG_SET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK); clock_p = &pipeline->fixed_clock; gst_object_replace ((GstObject **) clock_p, (GstObject *) clock); GST_OBJECT_UNLOCK (pipeline); GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using fixed clock %p (%s)", clock, (clock ? GST_OBJECT_NAME (clock) : "nil")); } /** * gst_pipeline_set_clock: * @pipeline: a #GstPipeline * @clock: (transfer none): the clock to set * * Set the clock for @pipeline. The clock will be distributed * to all the elements managed by the pipeline. * * Returns: TRUE if the clock could be set on the pipeline. FALSE if * some element did not accept the clock. * * MT safe. */ gboolean gst_pipeline_set_clock (GstPipeline * pipeline, GstClock * clock) { g_return_val_if_fail (pipeline != NULL, FALSE); g_return_val_if_fail (GST_IS_PIPELINE (pipeline), FALSE); return GST_ELEMENT_CLASS (parent_class)->set_clock (GST_ELEMENT_CAST (pipeline), clock); } /** * gst_pipeline_auto_clock: * @pipeline: a #GstPipeline * * Let @pipeline select a clock automatically. This is the default * behaviour. * * Use this function if you previous forced a fixed clock with * gst_pipeline_use_clock() and want to restore the default * pipeline clock selection algorithm. * * MT safe. */ void gst_pipeline_auto_clock (GstPipeline * pipeline) { GstClock **clock_p; g_return_if_fail (pipeline != NULL); g_return_if_fail (GST_IS_PIPELINE (pipeline)); GST_OBJECT_LOCK (pipeline); GST_OBJECT_FLAG_UNSET (pipeline, GST_PIPELINE_FLAG_FIXED_CLOCK); clock_p = &pipeline->fixed_clock; gst_object_replace ((GstObject **) clock_p, NULL); GST_OBJECT_UNLOCK (pipeline); GST_CAT_DEBUG (GST_CAT_CLOCK, "pipeline using automatic clock"); } /** * gst_pipeline_set_delay: * @pipeline: a #GstPipeline * @delay: the delay * * Set the expected delay needed for all elements to perform the * PAUSED to PLAYING state change. @delay will be added to the * base time of the elements so that they wait an additional @delay * amount of time before starting to process buffers and cannot be * #GST_CLOCK_TIME_NONE. * * This option is used for tuning purposes and should normally not be * used. * * MT safe. * * Since: 0.10.5 */ void gst_pipeline_set_delay (GstPipeline * pipeline, GstClockTime delay) { g_return_if_fail (GST_IS_PIPELINE (pipeline)); g_return_if_fail (delay != GST_CLOCK_TIME_NONE); GST_OBJECT_LOCK (pipeline); pipeline->delay = delay; GST_OBJECT_UNLOCK (pipeline); } /** * gst_pipeline_get_delay: * @pipeline: a #GstPipeline * * Get the configured delay (see gst_pipeline_set_delay()). * * Returns: The configured delay. * * MT safe. * * Since: 0.10.5 */ GstClockTime gst_pipeline_get_delay (GstPipeline * pipeline) { GstClockTime res; g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE); GST_OBJECT_LOCK (pipeline); res = pipeline->delay; GST_OBJECT_UNLOCK (pipeline); return res; } /** * gst_pipeline_set_auto_flush_bus: * @pipeline: a #GstPipeline * @auto_flush: whether or not to automatically flush the bus when * the pipeline goes from READY to NULL state * * Usually, when a pipeline goes from READY to NULL state, it automatically * flushes all pending messages on the bus, which is done for refcounting * purposes, to break circular references. * * This means that applications that update state using (async) bus messages * (e.g. do certain things when a pipeline goes from PAUSED to READY) might * not get to see messages when the pipeline is shut down, because they might * be flushed before they can be dispatched in the main thread. This behaviour * can be disabled using this function. * * It is important that all messages on the bus are handled when the * automatic flushing is disabled else memory leaks will be introduced. * * MT safe. * * Since: 0.10.4 */ void gst_pipeline_set_auto_flush_bus (GstPipeline * pipeline, gboolean auto_flush) { g_return_if_fail (GST_IS_PIPELINE (pipeline)); GST_OBJECT_LOCK (pipeline); pipeline->priv->auto_flush_bus = auto_flush; GST_OBJECT_UNLOCK (pipeline); } /** * gst_pipeline_get_auto_flush_bus: * @pipeline: a #GstPipeline * * Check if @pipeline will automatically flush messages when going to * the NULL state. * * Returns: whether the pipeline will automatically flush its bus when * going from READY to NULL state or not. * * MT safe. * * Since: 0.10.4 */ gboolean gst_pipeline_get_auto_flush_bus (GstPipeline * pipeline) { gboolean res; g_return_val_if_fail (GST_IS_PIPELINE (pipeline), FALSE); GST_OBJECT_LOCK (pipeline); res = pipeline->priv->auto_flush_bus; GST_OBJECT_UNLOCK (pipeline); return res; }