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Also adds those flags to the configure warning flags https://bugzilla.gnome.org/show_bug.cgi?id=611692
914 lines
28 KiB
C
914 lines
28 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2004,2005 Wim Taymans <wim@fluendo.com>
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*
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* gstpipeline.c: Overall pipeline management element
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstpipeline
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* @short_description: Top-level bin with clocking and bus management
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functionality.
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* @see_also: #GstElement, #GstBin, #GstClock, #GstBus
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*
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* A #GstPipeline is a special #GstBin used as the toplevel container for
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* the filter graph. The #GstPipeline will manage the selection and
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* distribution of a global #GstClock as well as provide a #GstBus to the
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* application. It will also implement a default behavour for managing
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* seek events (see gst_element_seek()).
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*
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* gst_pipeline_new() is used to create a pipeline. when you are done with
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* the pipeline, use gst_object_unref() to free its resources including all
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* added #GstElement objects (if not otherwise referenced).
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*
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* Elements are added and removed from the pipeline using the #GstBin
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* methods like gst_bin_add() and gst_bin_remove() (see #GstBin).
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*
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* Before changing the state of the #GstPipeline (see #GstElement) a #GstBus
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* can be retrieved with gst_pipeline_get_bus(). This bus can then be
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* used to receive #GstMessage from the elements in the pipeline.
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*
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* By default, a #GstPipeline will automatically flush the pending #GstBus
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* messages when going to the NULL state to ensure that no circular
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* references exist when no messages are read from the #GstBus. This
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* behaviour can be changed with gst_pipeline_set_auto_flush_bus().
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*
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* When the #GstPipeline performs the PAUSED to PLAYING state change it will
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* select a clock for the elements. The clock selection algorithm will by
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* default select a clock provided by an element that is most upstream
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* (closest to the source). For live pipelines (ones that return
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* #GST_STATE_CHANGE_NO_PREROLL from the gst_element_set_state() call) this
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* will select the clock provided by the live source. For normal pipelines
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* this will select a clock provided by the sinks (most likely the audio
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* sink). If no element provides a clock, a default #GstSystemClock is used.
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*
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* The clock selection can be controlled with the gst_pipeline_use_clock()
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* method, which will enforce a given clock on the pipeline. With
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* gst_pipeline_auto_clock() the default clock selection algorithm can be
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* restored.
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*
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* A #GstPipeline maintains a running time for the elements. The running
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* time is defined as the difference between the current clock time and
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* the base time. When the pipeline goes to READY or a flushing seek is
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* performed on it, the running time is reset to 0. When the pipeline is
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* set from PLAYING to PAUSED, the current clock time is sampled and used to
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* configure the base time for the elements when the pipeline is set
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* to PLAYING again. The effect is that the running time (as the difference
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* between the clock time and the base time) will count how much time was spent
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* in the PLAYING state. This default behaviour can be changed with the
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* gst_element_set_start_time() method.
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*
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* When sending a flushing seek event to a GstPipeline (see
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* gst_element_seek()), it will make sure that the pipeline is properly
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* PAUSED and resumed as well as set the new running time to 0 when the
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* seek succeeded.
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*
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* Last reviewed on 2009-05-29 (0.10.24)
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*/
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#include "gst_private.h"
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#include "gsterror.h"
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#include "gst-i18n-lib.h"
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#include "gstpipeline.h"
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#include "gstinfo.h"
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#include "gstsystemclock.h"
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#include "gstutils.h"
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GST_DEBUG_CATEGORY_STATIC (pipeline_debug);
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#define GST_CAT_DEFAULT pipeline_debug
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/* Pipeline signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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#define DEFAULT_DELAY 0
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#define DEFAULT_AUTO_FLUSH_BUS TRUE
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enum
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{
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PROP_0,
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PROP_DELAY,
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PROP_AUTO_FLUSH_BUS
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};
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#define GST_PIPELINE_GET_PRIVATE(obj) \
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(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_PIPELINE, GstPipelinePrivate))
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struct _GstPipelinePrivate
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{
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/* with LOCK */
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gboolean auto_flush_bus;
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/* when we need to update stream_time or clock when going back to
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* PLAYING*/
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GstClockTime last_start_time;
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gboolean update_clock;
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};
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static void gst_pipeline_dispose (GObject * object);
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static void gst_pipeline_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_pipeline_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstClock *gst_pipeline_provide_clock_func (GstElement * element);
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static GstStateChangeReturn gst_pipeline_change_state (GstElement * element,
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GstStateChange transition);
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static void gst_pipeline_handle_message (GstBin * bin, GstMessage * message);
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/* static guint gst_pipeline_signals[LAST_SIGNAL] = { 0 }; */
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#define _do_init(type) \
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{ \
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GST_DEBUG_CATEGORY_INIT (pipeline_debug, "pipeline", GST_DEBUG_BOLD, \
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"debugging info for the 'pipeline' container element"); \
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}
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GST_BOILERPLATE_FULL (GstPipeline, gst_pipeline, GstBin, GST_TYPE_BIN,
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_do_init);
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static void
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gst_pipeline_base_init (gpointer g_class)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details_simple (gstelement_class, "Pipeline object",
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"Generic/Bin",
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"Complete pipeline object",
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"Erik Walthinsen <omega@cse.ogi.edu>, Wim Taymans <wim@fluendo.com>");
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}
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static void
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gst_pipeline_class_init (GstPipelineClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
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GstBinClass *gstbin_class = GST_BIN_CLASS (klass);
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g_type_class_add_private (klass, sizeof (GstPipelinePrivate));
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gobject_class->set_property = gst_pipeline_set_property;
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gobject_class->get_property = gst_pipeline_get_property;
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/**
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* GstPipeline:delay
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*
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* The expected delay needed for elements to spin up to the
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* PLAYING state expressed in nanoseconds.
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* see gst_pipeline_set_delay() for more information on this option.
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*
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* Since: 0.10.5
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**/
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g_object_class_install_property (gobject_class, PROP_DELAY,
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g_param_spec_uint64 ("delay", "Delay",
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"Expected delay needed for elements "
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"to spin up to PLAYING in nanoseconds", 0, G_MAXUINT64, DEFAULT_DELAY,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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/**
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* GstPipeline:auto-flush-bus:
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*
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* Whether or not to automatically flush all messages on the
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* pipeline's bus when going from READY to NULL state. Please see
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* gst_pipeline_set_auto_flush_bus() for more information on this option.
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*
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* Since: 0.10.4
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**/
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g_object_class_install_property (gobject_class, PROP_AUTO_FLUSH_BUS,
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g_param_spec_boolean ("auto-flush-bus", "Auto Flush Bus",
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"Whether to automatically flush the pipeline's bus when going "
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"from READY into NULL state", DEFAULT_AUTO_FLUSH_BUS,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gobject_class->dispose = gst_pipeline_dispose;
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_pipeline_change_state);
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gstelement_class->provide_clock =
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GST_DEBUG_FUNCPTR (gst_pipeline_provide_clock_func);
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gstbin_class->handle_message =
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GST_DEBUG_FUNCPTR (gst_pipeline_handle_message);
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}
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static void
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gst_pipeline_init (GstPipeline * pipeline, GstPipelineClass * klass)
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{
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GstBus *bus;
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pipeline->priv = GST_PIPELINE_GET_PRIVATE (pipeline);
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/* set default property values */
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pipeline->priv->auto_flush_bus = DEFAULT_AUTO_FLUSH_BUS;
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pipeline->delay = DEFAULT_DELAY;
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/* create and set a default bus */
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bus = gst_bus_new ();
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#if 0
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/* FIXME, disabled for 0.10.5 release as it caused to many regressions */
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/* Start our bus in flushing if appropriate */
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if (pipeline->priv->auto_flush_bus)
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gst_bus_set_flushing (bus, TRUE);
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#endif
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gst_element_set_bus (GST_ELEMENT_CAST (pipeline), bus);
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GST_DEBUG_OBJECT (pipeline, "set bus %" GST_PTR_FORMAT " on pipeline", bus);
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gst_object_unref (bus);
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}
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static void
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gst_pipeline_dispose (GObject * object)
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{
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GstPipeline *pipeline = GST_PIPELINE (object);
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GstClock **clock_p = &pipeline->fixed_clock;
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GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pipeline, "dispose");
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/* clear and unref any fixed clock */
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gst_object_replace ((GstObject **) clock_p, NULL);
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static void
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gst_pipeline_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstPipeline *pipeline = GST_PIPELINE (object);
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switch (prop_id) {
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case PROP_DELAY:
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gst_pipeline_set_delay (pipeline, g_value_get_uint64 (value));
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break;
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case PROP_AUTO_FLUSH_BUS:
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gst_pipeline_set_auto_flush_bus (pipeline, g_value_get_boolean (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_pipeline_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstPipeline *pipeline = GST_PIPELINE (object);
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switch (prop_id) {
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case PROP_DELAY:
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g_value_set_uint64 (value, gst_pipeline_get_delay (pipeline));
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break;
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case PROP_AUTO_FLUSH_BUS:
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g_value_set_boolean (value, gst_pipeline_get_auto_flush_bus (pipeline));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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/* set the start_time to 0, this will cause us to select a new base_time and
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* make the running_time start from 0 again. */
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static void
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reset_start_time (GstPipeline * pipeline)
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{
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GST_OBJECT_LOCK (pipeline);
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if (GST_ELEMENT_START_TIME (pipeline) != GST_CLOCK_TIME_NONE) {
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GST_DEBUG_OBJECT (pipeline, "reset start_time to 0");
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GST_ELEMENT_START_TIME (pipeline) = 0;
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pipeline->priv->last_start_time = -1;
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} else {
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GST_DEBUG_OBJECT (pipeline, "application asked to not reset stream_time");
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}
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GST_OBJECT_UNLOCK (pipeline);
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}
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/**
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* gst_pipeline_new:
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* @name: name of new pipeline
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*
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* Create a new pipeline with the given name.
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*
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* Returns: newly created GstPipeline
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*
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* MT safe.
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*/
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GstElement *
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gst_pipeline_new (const gchar * name)
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{
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return gst_element_factory_make ("pipeline", name);
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}
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/* takes a snapshot of the running_time of the pipeline and store this as the
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* element start_time. This is the time we will set as the running_time of the
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* pipeline when we go to PLAYING next. */
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static void
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pipeline_update_start_time (GstElement * element)
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{
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GstPipeline *pipeline = GST_PIPELINE_CAST (element);
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GstClock *clock;
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GST_OBJECT_LOCK (element);
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if ((clock = element->clock)) {
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GstClockTime now;
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gst_object_ref (clock);
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GST_OBJECT_UNLOCK (element);
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/* calculate the time when we stopped */
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now = gst_clock_get_time (clock);
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gst_object_unref (clock);
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GST_OBJECT_LOCK (element);
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/* store the current running time */
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if (GST_ELEMENT_START_TIME (pipeline) != GST_CLOCK_TIME_NONE) {
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GST_ELEMENT_START_TIME (pipeline) = now - element->base_time;
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/* we went to PAUSED, when going to PLAYING select clock and new
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* base_time */
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pipeline->priv->update_clock = TRUE;
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}
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GST_DEBUG_OBJECT (element,
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"start_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
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", base_time %" GST_TIME_FORMAT,
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GST_TIME_ARGS (GST_ELEMENT_START_TIME (pipeline)),
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GST_TIME_ARGS (now), GST_TIME_ARGS (element->base_time));
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}
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GST_OBJECT_UNLOCK (element);
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}
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/* MT safe */
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static GstStateChangeReturn
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gst_pipeline_change_state (GstElement * element, GstStateChange transition)
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{
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GstStateChangeReturn result = GST_STATE_CHANGE_SUCCESS;
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GstPipeline *pipeline = GST_PIPELINE_CAST (element);
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GstClock *clock;
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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GST_OBJECT_LOCK (element);
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if (element->bus)
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gst_bus_set_flushing (element->bus, FALSE);
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GST_OBJECT_UNLOCK (element);
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break;
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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GST_OBJECT_LOCK (element);
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pipeline->priv->update_clock = TRUE;
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GST_OBJECT_UNLOCK (element);
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break;
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case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
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{
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GstClockTime now, start_time, last_start_time, delay;
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gboolean update_clock;
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GstClock *cur_clock;
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GST_DEBUG_OBJECT (element, "selecting clock and base_time");
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GST_OBJECT_LOCK (element);
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cur_clock = element->clock;
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if (cur_clock)
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gst_object_ref (cur_clock);
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/* get the desired running_time of the first buffer aka the start_time */
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start_time = GST_ELEMENT_START_TIME (pipeline);
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last_start_time = pipeline->priv->last_start_time;
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pipeline->priv->last_start_time = start_time;
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/* see if we need to update the clock */
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update_clock = pipeline->priv->update_clock;
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pipeline->priv->update_clock = FALSE;
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delay = pipeline->delay;
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GST_OBJECT_UNLOCK (element);
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/* running time changed, either with a PAUSED or a flush, we need to check
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* if there is a new clock & update the base time */
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if (last_start_time != start_time) {
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GST_DEBUG_OBJECT (pipeline, "Need to update start_time");
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/* when going to PLAYING, select a clock when needed. If we just got
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* flushed, we don't reselect the clock. */
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if (update_clock) {
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GST_DEBUG_OBJECT (pipeline, "Need to update clock.");
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clock = gst_element_provide_clock (element);
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} else {
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GST_DEBUG_OBJECT (pipeline,
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"Don't need to update clock, using old clock.");
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clock = gst_object_ref (cur_clock);
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}
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if (clock) {
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now = gst_clock_get_time (clock);
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} else {
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GST_DEBUG ("no clock, using base time of NONE");
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now = GST_CLOCK_TIME_NONE;
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}
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if (clock != cur_clock) {
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/* now distribute the clock (which could be NULL). If some
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* element refuses the clock, this will return FALSE and
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* we effectively fail the state change. */
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if (!gst_element_set_clock (element, clock))
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goto invalid_clock;
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/* if we selected and distributed a new clock, let the app
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* know about it */
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gst_element_post_message (element,
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gst_message_new_new_clock (GST_OBJECT_CAST (element), clock));
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}
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if (clock)
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gst_object_unref (clock);
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if (start_time != GST_CLOCK_TIME_NONE && now != GST_CLOCK_TIME_NONE) {
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GstClockTime new_base_time = now - start_time + delay;
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GST_DEBUG_OBJECT (element,
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"start_time=%" GST_TIME_FORMAT ", now=%" GST_TIME_FORMAT
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", base_time %" GST_TIME_FORMAT,
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GST_TIME_ARGS (start_time), GST_TIME_ARGS (now),
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GST_TIME_ARGS (new_base_time));
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gst_element_set_base_time (element, new_base_time);
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} else {
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GST_DEBUG_OBJECT (pipeline,
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"NOT adjusting base_time because start_time is NONE");
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}
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} else {
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GST_DEBUG_OBJECT (pipeline,
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"NOT adjusting base_time because we selected one before");
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}
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if (cur_clock)
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gst_object_unref (cur_clock);
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break;
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}
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case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
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{
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/* we take a start_time snapshot before calling the children state changes
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* so that they know about when the pipeline PAUSED. */
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pipeline_update_start_time (element);
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break;
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}
|
|
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;
|
|
}
|
|
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: a #GstBus, unref after usage.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstBus *
|
|
gst_pipeline_get_bus (GstPipeline * pipeline)
|
|
{
|
|
return gst_element_get_bus (GST_ELEMENT_CAST (pipeline));
|
|
}
|
|
|
|
/**
|
|
* gst_pipeline_set_new_stream_time:
|
|
* @pipeline: a #GstPipeline
|
|
* @time: the new running time to set
|
|
*
|
|
* Set the new start time of @pipeline to @time. The start time is used to
|
|
* set the base time on the elements (see gst_element_set_base_time())
|
|
* in the PAUSED->PLAYING state transition.
|
|
*
|
|
* Setting @time to #GST_CLOCK_TIME_NONE will disable the pipeline's management
|
|
* of element base time. The application will then be responsible for
|
|
* performing base time distribution. This is sometimes useful if you want to
|
|
* synchronize capture from multiple pipelines, and you can also ensure that the
|
|
* pipelines have the same clock.
|
|
*
|
|
* MT safe.
|
|
*
|
|
* Deprecated: This function has the wrong name and is equivalent to
|
|
* gst_element_set_start_time().
|
|
*/
|
|
#ifndef GST_REMOVE_DEPRECATED
|
|
#ifdef GST_DISABLE_DEPRECATED
|
|
void
|
|
gst_pipeline_set_new_stream_time (GstPipeline * pipeline, GstClockTime time);
|
|
#endif
|
|
void
|
|
gst_pipeline_set_new_stream_time (GstPipeline * pipeline, GstClockTime time)
|
|
{
|
|
g_return_if_fail (GST_IS_PIPELINE (pipeline));
|
|
|
|
gst_element_set_start_time (GST_ELEMENT_CAST (pipeline), time);
|
|
|
|
if (time == GST_CLOCK_TIME_NONE)
|
|
GST_DEBUG_OBJECT (pipeline, "told not to adjust base_time");
|
|
}
|
|
#endif /* GST_REMOVE_DEPRECATED */
|
|
|
|
/**
|
|
* gst_pipeline_get_last_stream_time:
|
|
* @pipeline: a #GstPipeline
|
|
*
|
|
* Gets the last running time of @pipeline. If the pipeline is PLAYING,
|
|
* the returned time is the running time used to configure the element's
|
|
* base time in the PAUSED->PLAYING state. If the pipeline is PAUSED, the
|
|
* returned time is the running time when the pipeline was paused.
|
|
*
|
|
* This function returns #GST_CLOCK_TIME_NONE if the pipeline was
|
|
* configured to not handle the management of the element's base time
|
|
* (see gst_pipeline_set_new_stream_time()).
|
|
*
|
|
* MT safe.
|
|
*
|
|
* Returns: a #GstClockTime.
|
|
*
|
|
* Deprecated: This function has the wrong name and is equivalent to
|
|
* gst_element_get_start_time().
|
|
*/
|
|
#ifndef GST_REMOVE_DEPRECATED
|
|
#ifdef GST_DISABLE_DEPRECATED
|
|
GstClockTime gst_pipeline_get_last_stream_time (GstPipeline * pipeline);
|
|
#endif
|
|
GstClockTime
|
|
gst_pipeline_get_last_stream_time (GstPipeline * pipeline)
|
|
{
|
|
GstClockTime result;
|
|
|
|
g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
|
|
|
|
result = gst_element_get_start_time (GST_ELEMENT_CAST (pipeline));
|
|
|
|
return result;
|
|
}
|
|
#endif /* GST_REMOVE_DEPRECATED */
|
|
|
|
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: 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: 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: 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;
|
|
}
|