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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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1028 lines
32 KiB
C
1028 lines
32 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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:gstpipeline
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* @title: 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.
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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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#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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#define DEFAULT_LATENCY GST_CLOCK_TIME_NONE
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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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PROP_LATENCY
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};
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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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GstClockTime latency;
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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 gboolean gst_pipeline_do_latency (GstBin * bin);
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/* static guint gst_pipeline_signals[LAST_SIGNAL] = { 0 }; */
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#define _do_init \
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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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#define gst_pipeline_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstPipeline, gst_pipeline, GST_TYPE_BIN,
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G_ADD_PRIVATE (GstPipeline) _do_init);
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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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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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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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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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/**
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* GstPipeline:latency:
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*
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* Latency to configure on the pipeline. See gst_pipeline_set_latency().
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*
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* Since: 1.6
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**/
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g_object_class_install_property (gobject_class, PROP_LATENCY,
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g_param_spec_uint64 ("latency", "Latency",
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"Latency to configure on the pipeline", 0, G_MAXUINT64,
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DEFAULT_LATENCY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gobject_class->dispose = gst_pipeline_dispose;
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gst_element_class_set_static_metadata (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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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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gstbin_class->do_latency = GST_DEBUG_FUNCPTR (gst_pipeline_do_latency);
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}
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static void
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gst_pipeline_init (GstPipeline * pipeline)
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{
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GstBus *bus;
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pipeline->priv = gst_pipeline_get_instance_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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pipeline->priv->latency = DEFAULT_LATENCY;
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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, "%p dispose", pipeline);
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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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case PROP_LATENCY:
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gst_pipeline_set_latency (pipeline, g_value_get_uint64 (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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case PROP_LATENCY:
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g_value_set_uint64 (value, gst_pipeline_get_latency (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, GstClockTime start_time)
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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) = start_time;
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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: (allow-none): 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: (transfer floating): 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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if (now != GST_CLOCK_TIME_NONE)
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GST_ELEMENT_START_TIME (pipeline) = now - element->base_time;
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else
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GST_WARNING_OBJECT (element,
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"Clock %s returned invalid time, can't calculate "
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"running_time when going to the PAUSED state",
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GST_OBJECT_NAME (clock));
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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_NULL:
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break;
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case GST_STATE_CHANGE_READY_TO_READY:
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break;
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case GST_STATE_CHANGE_PAUSED_TO_PAUSED:
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break;
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case GST_STATE_CHANGE_PLAYING_TO_PLAYING:
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break;
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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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/* READY to PAUSED starts running_time from 0 */
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reset_start_time (pipeline, 0);
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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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/* only do this for top-level, however */
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if (GST_OBJECT_PARENT (element) == NULL &&
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(update_clock || 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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/* only try to ref if cur_clock is not NULL */
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if (cur_clock)
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gst_object_ref (cur_clock);
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clock = 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_OBJECT (pipeline, "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) {
|
|
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:
|
|
reset_start_time (pipeline, 0);
|
|
break;
|
|
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_NULL:
|
|
break;
|
|
case GST_STATE_CHANGE_READY_TO_READY:
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_PAUSED:
|
|
break;
|
|
case GST_STATE_CHANGE_PLAYING_TO_PLAYING:
|
|
break;
|
|
case GST_STATE_CHANGE_NULL_TO_READY:
|
|
break;
|
|
case GST_STATE_CHANGE_READY_TO_PAUSED:
|
|
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_RESET_TIME:
|
|
{
|
|
GstClockTime running_time;
|
|
|
|
gst_message_parse_reset_time (message, &running_time);
|
|
|
|
/* reset our running time if we need to distribute a new base_time to the
|
|
* children. */
|
|
reset_start_time (pipeline, running_time);
|
|
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);
|
|
}
|
|
|
|
static gboolean
|
|
gst_pipeline_do_latency (GstBin * bin)
|
|
{
|
|
GstPipeline *pipeline = GST_PIPELINE (bin);
|
|
GstQuery *query;
|
|
GstClockTime latency;
|
|
GstClockTime min_latency, max_latency;
|
|
gboolean res;
|
|
|
|
GST_OBJECT_LOCK (pipeline);
|
|
latency = pipeline->priv->latency;
|
|
GST_OBJECT_UNLOCK (pipeline);
|
|
|
|
if (latency == GST_CLOCK_TIME_NONE)
|
|
return GST_BIN_CLASS (parent_class)->do_latency (bin);
|
|
|
|
GST_DEBUG_OBJECT (pipeline, "querying latency");
|
|
|
|
query = gst_query_new_latency ();
|
|
if ((res = gst_element_query (GST_ELEMENT_CAST (pipeline), query))) {
|
|
gboolean live;
|
|
|
|
gst_query_parse_latency (query, &live, &min_latency, &max_latency);
|
|
|
|
GST_DEBUG_OBJECT (pipeline,
|
|
"got min latency %" GST_TIME_FORMAT ", max latency %"
|
|
GST_TIME_FORMAT ", live %d", GST_TIME_ARGS (min_latency),
|
|
GST_TIME_ARGS (max_latency), live);
|
|
|
|
if (max_latency < min_latency) {
|
|
/* this is an impossible situation, some parts of the pipeline might not
|
|
* work correctly. We post a warning for now. */
|
|
GST_ELEMENT_WARNING (pipeline, CORE, CLOCK, (NULL),
|
|
("Impossible to configure latency: max %" GST_TIME_FORMAT " < min %"
|
|
GST_TIME_FORMAT ". Add queues or other buffering elements.",
|
|
GST_TIME_ARGS (max_latency), GST_TIME_ARGS (min_latency)));
|
|
}
|
|
|
|
if (latency < min_latency) {
|
|
/* This is a problematic situation as we will most likely drop lots of
|
|
* data if we configure a too low latency */
|
|
GST_ELEMENT_WARNING (pipeline, CORE, CLOCK, (NULL),
|
|
("Configured latency is lower than detected minimum latency: configured %"
|
|
GST_TIME_FORMAT " < min %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (latency), GST_TIME_ARGS (min_latency)));
|
|
}
|
|
} else {
|
|
/* this is not a real problem, we just don't configure any latency. */
|
|
GST_WARNING_OBJECT (pipeline, "failed to query latency");
|
|
}
|
|
gst_query_unref (query);
|
|
|
|
|
|
/* configure latency on elements */
|
|
res =
|
|
gst_element_send_event (GST_ELEMENT_CAST (pipeline),
|
|
gst_event_new_latency (latency));
|
|
if (res) {
|
|
GST_INFO_OBJECT (pipeline, "configured latency of %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (latency));
|
|
} else {
|
|
GST_WARNING_OBJECT (pipeline,
|
|
"did not really configure latency of %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (latency));
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* 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: (skip)
|
|
* @pipeline: a #GstPipeline
|
|
*
|
|
* Gets the current clock used by @pipeline. Users of object
|
|
* oriented languages should use gst_pipeline_get_pipeline_clock()
|
|
* to avoid confusion with gst_element_get_clock() which has a different behavior.
|
|
*
|
|
* Unlike gst_element_get_clock(), this function will always return a
|
|
* clock, even if the pipeline is not in the PLAYING state.
|
|
*
|
|
* Returns: (transfer full): a #GstClock, unref after usage.
|
|
*/
|
|
GstClock *
|
|
gst_pipeline_get_clock (GstPipeline * pipeline)
|
|
{
|
|
return gst_pipeline_get_pipeline_clock (pipeline);
|
|
}
|
|
|
|
/**
|
|
* gst_pipeline_get_pipeline_clock:
|
|
* @pipeline: a #GstPipeline
|
|
*
|
|
* Gets the current clock used by @pipeline.
|
|
*
|
|
* Unlike gst_element_get_clock(), this function will always return a
|
|
* clock, even if the pipeline is not in the PLAYING state.
|
|
*
|
|
* Returns: (transfer full): a #GstClock, unref after usage.
|
|
*
|
|
* Since: 1.6
|
|
*/
|
|
GstClock *
|
|
gst_pipeline_get_pipeline_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) (allow-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: (skip)
|
|
* @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.
|
|
*/
|
|
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.
|
|
*/
|
|
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.
|
|
*/
|
|
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.
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* gst_pipeline_set_latency:
|
|
* @pipeline: a #GstPipeline
|
|
* @latency: latency to configure
|
|
*
|
|
* Sets the latency that should be configured on the pipeline. Setting
|
|
* GST_CLOCK_TIME_NONE will restore the default behaviour of using the minimum
|
|
* latency from the LATENCY query. Setting this is usually not required and
|
|
* the pipeline will figure out an appropriate latency automatically.
|
|
*
|
|
* Setting a too low latency, especially lower than the minimum latency from
|
|
* the LATENCY query, will most likely cause the pipeline to fail.
|
|
*
|
|
* Since: 1.6
|
|
*/
|
|
void
|
|
gst_pipeline_set_latency (GstPipeline * pipeline, GstClockTime latency)
|
|
{
|
|
gboolean changed;
|
|
|
|
g_return_if_fail (GST_IS_PIPELINE (pipeline));
|
|
|
|
GST_OBJECT_LOCK (pipeline);
|
|
changed = (pipeline->priv->latency != latency);
|
|
pipeline->priv->latency = latency;
|
|
GST_OBJECT_UNLOCK (pipeline);
|
|
|
|
if (changed)
|
|
gst_bin_recalculate_latency (GST_BIN_CAST (pipeline));
|
|
}
|
|
|
|
/**
|
|
* gst_pipeline_get_latency:
|
|
* @pipeline: a #GstPipeline
|
|
*
|
|
* Gets the latency that should be configured on the pipeline. See
|
|
* gst_pipeline_set_latency().
|
|
*
|
|
* Returns: Latency to configure on the pipeline or GST_CLOCK_TIME_NONE
|
|
*
|
|
* Since: 1.6
|
|
*/
|
|
|
|
GstClockTime
|
|
gst_pipeline_get_latency (GstPipeline * pipeline)
|
|
{
|
|
GstClockTime latency;
|
|
|
|
g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
|
|
|
|
GST_OBJECT_LOCK (pipeline);
|
|
latency = pipeline->priv->latency;
|
|
GST_OBJECT_UNLOCK (pipeline);
|
|
|
|
return latency;
|
|
}
|