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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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92d5d5bc57
g_clear_pointer is not thread-safe and never was. GLib similarly removed the volatile from g_clear_object in 2aacef39b1. Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/issues/327
1489 lines
43 KiB
C
1489 lines
43 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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* 2005 Wim Taymans <wim@fluendo.com>
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*
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* gstobject.c: Fundamental class used for all of GStreamer
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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:gstobject
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* @title: GstObject
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* @short_description: Base class for the GStreamer object hierarchy
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*
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* #GstObject provides a root for the object hierarchy tree filed in by the
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* GStreamer library. It is currently a thin wrapper on top of
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* #GInitiallyUnowned. It is an abstract class that is not very usable on its own.
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*
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* #GstObject gives us basic refcounting, parenting functionality and locking.
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* Most of the functions are just extended for special GStreamer needs and can be
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* found under the same name in the base class of #GstObject which is #GObject
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* (e.g. g_object_ref() becomes gst_object_ref()).
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*
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* Since #GstObject derives from #GInitiallyUnowned, it also inherits the
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* floating reference. Be aware that functions such as gst_bin_add() and
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* gst_element_add_pad() take ownership of the floating reference.
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*
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* In contrast to #GObject instances, #GstObject adds a name property. The functions
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* gst_object_set_name() and gst_object_get_name() are used to set/get the name
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* of the object.
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*
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* ## controlled properties
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*
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* Controlled properties offers a lightweight way to adjust gobject properties
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* over stream-time. It works by using time-stamped value pairs that are queued
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* for element-properties. At run-time the elements continuously pull value
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* changes for the current stream-time.
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*
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* What needs to be changed in a #GstElement?
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* Very little - it is just two steps to make a plugin controllable!
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*
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* * mark gobject-properties paramspecs that make sense to be controlled,
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* by GST_PARAM_CONTROLLABLE.
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*
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* * when processing data (get, chain, loop function) at the beginning call
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* gst_object_sync_values(element,timestamp).
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* This will make the controller update all GObject properties that are
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* under its control with the current values based on the timestamp.
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*
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* What needs to be done in applications? Again it's not a lot to change.
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*
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* * create a #GstControlSource.
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* csource = gst_interpolation_control_source_new ();
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* g_object_set (csource, "mode", GST_INTERPOLATION_MODE_LINEAR, NULL);
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*
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* * Attach the #GstControlSource on the controller to a property.
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* gst_object_add_control_binding (object, gst_direct_control_binding_new (object, "prop1", csource));
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*
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* * Set the control values
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* gst_timed_value_control_source_set ((GstTimedValueControlSource *)csource,0 * GST_SECOND, value1);
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* gst_timed_value_control_source_set ((GstTimedValueControlSource *)csource,1 * GST_SECOND, value2);
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*
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* * start your pipeline
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*/
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#include "gst_private.h"
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#include "glib-compat-private.h"
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#include "gstobject.h"
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#include "gstclock.h"
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#include "gstcontrolbinding.h"
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#include "gstcontrolsource.h"
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#include "gstinfo.h"
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#include "gstparamspecs.h"
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#include "gstutils.h"
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#define DEBUG_REFCOUNT
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/* Object signals and args */
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enum
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{
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DEEP_NOTIFY,
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LAST_SIGNAL
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};
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enum
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{
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PROP_0,
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PROP_NAME,
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PROP_PARENT,
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PROP_LAST
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};
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enum
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{
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SO_OBJECT_LOADED,
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SO_LAST_SIGNAL
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};
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/* maps type name quark => count */
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static GData *object_name_counts = NULL;
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G_LOCK_DEFINE_STATIC (object_name_mutex);
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static void gst_object_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_object_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_object_dispatch_properties_changed (GObject * object,
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guint n_pspecs, GParamSpec ** pspecs);
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static void gst_object_dispose (GObject * object);
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static void gst_object_finalize (GObject * object);
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static gboolean gst_object_set_name_default (GstObject * object);
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static guint gst_object_signals[LAST_SIGNAL] = { 0 };
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static GParamSpec *properties[PROP_LAST];
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G_DEFINE_ABSTRACT_TYPE (GstObject, gst_object, G_TYPE_INITIALLY_UNOWNED);
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static void
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gst_object_constructed (GObject * object)
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{
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GST_TRACER_OBJECT_CREATED (GST_OBJECT_CAST (object));
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((GObjectClass *) gst_object_parent_class)->constructed (object);
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}
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static void
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gst_object_class_init (GstObjectClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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gobject_class->set_property = gst_object_set_property;
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gobject_class->get_property = gst_object_get_property;
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properties[PROP_NAME] =
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g_param_spec_string ("name", "Name", "The name of the object", NULL,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS);
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/**
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* GstObject:parent:
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*
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* The parent of the object. Please note, that when changing the 'parent'
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* property, we don't emit #GObject::notify and #GstObject::deep-notify
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* signals due to locking issues. In some cases one can use
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* #GstBin::element-added or #GstBin::element-removed signals on the parent to
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* achieve a similar effect.
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*/
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properties[PROP_PARENT] =
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g_param_spec_object ("parent", "Parent", "The parent of the object",
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GST_TYPE_OBJECT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
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g_object_class_install_properties (gobject_class, PROP_LAST, properties);
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/**
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* GstObject::deep-notify:
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* @gstobject: a #GstObject
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* @prop_object: the object that originated the signal
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* @prop: the property that changed
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*
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* The deep notify signal is used to be notified of property changes. It is
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* typically attached to the toplevel bin to receive notifications from all
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* the elements contained in that bin.
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*/
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gst_object_signals[DEEP_NOTIFY] =
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g_signal_new ("deep-notify", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE | G_SIGNAL_DETAILED |
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G_SIGNAL_NO_HOOKS, G_STRUCT_OFFSET (GstObjectClass, deep_notify), NULL,
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NULL, g_cclosure_marshal_generic, G_TYPE_NONE, 2, GST_TYPE_OBJECT,
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G_TYPE_PARAM);
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klass->path_string_separator = "/";
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/* see the comments at gst_object_dispatch_properties_changed */
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gobject_class->dispatch_properties_changed
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= GST_DEBUG_FUNCPTR (gst_object_dispatch_properties_changed);
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gobject_class->constructed = gst_object_constructed;
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gobject_class->dispose = gst_object_dispose;
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gobject_class->finalize = gst_object_finalize;
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}
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static void
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gst_object_init (GstObject * object)
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{
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g_mutex_init (&object->lock);
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object->parent = NULL;
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object->name = NULL;
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GST_CAT_TRACE_OBJECT (GST_CAT_REFCOUNTING, object, "%p new", object);
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object->flags = 0;
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object->control_rate = 100 * GST_MSECOND;
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object->last_sync = GST_CLOCK_TIME_NONE;
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}
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/**
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* gst_object_ref:
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* @object: (type Gst.Object): a #GstObject to reference
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*
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* Increments the reference count on @object. This function
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* does not take the lock on @object because it relies on
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* atomic refcounting.
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*
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* This object returns the input parameter to ease writing
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* constructs like :
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* result = gst_object_ref (object->parent);
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*
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* Returns: (transfer full) (type Gst.Object): A pointer to @object
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*/
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gpointer
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gst_object_ref (gpointer object)
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{
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g_return_val_if_fail (object != NULL, NULL);
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GST_TRACER_OBJECT_REFFED (object, ((GObject *) object)->ref_count + 1);
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#ifdef DEBUG_REFCOUNT
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GST_CAT_TRACE_OBJECT (GST_CAT_REFCOUNTING, object, "%p ref %d->%d", object,
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((GObject *) object)->ref_count, ((GObject *) object)->ref_count + 1);
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#endif
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g_object_ref (object);
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return object;
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}
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/**
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* gst_object_unref:
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* @object: (type Gst.Object): a #GstObject to unreference
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*
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* Decrements the reference count on @object. If reference count hits
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* zero, destroy @object. This function does not take the lock
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* on @object as it relies on atomic refcounting.
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*
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* The unref method should never be called with the LOCK held since
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* this might deadlock the dispose function.
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*/
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void
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gst_object_unref (gpointer object)
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{
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g_return_if_fail (object != NULL);
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g_return_if_fail (((GObject *) object)->ref_count > 0);
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GST_TRACER_OBJECT_UNREFFED (object, ((GObject *) object)->ref_count - 1);
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#ifdef DEBUG_REFCOUNT
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GST_CAT_TRACE_OBJECT (GST_CAT_REFCOUNTING, object, "%p unref %d->%d", object,
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((GObject *) object)->ref_count, ((GObject *) object)->ref_count - 1);
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#endif
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g_object_unref (object);
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}
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/**
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* gst_object_ref_sink: (skip)
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* @object: a #GstObject to sink
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*
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* Increase the reference count of @object, and possibly remove the floating
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* reference, if @object has a floating reference.
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*
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* In other words, if the object is floating, then this call "assumes ownership"
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* of the floating reference, converting it to a normal reference by clearing
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* the floating flag while leaving the reference count unchanged. If the object
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* is not floating, then this call adds a new normal reference increasing the
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* reference count by one.
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*
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* For more background on "floating references" please see the #GObject
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* documentation.
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*/
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gpointer
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gst_object_ref_sink (gpointer object)
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{
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g_return_val_if_fail (object != NULL, NULL);
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#ifdef DEBUG_REFCOUNT
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GST_CAT_TRACE_OBJECT (GST_CAT_REFCOUNTING, object, "%p ref_sink %d->%d",
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object, ((GObject *) object)->ref_count,
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((GObject *) object)->ref_count + 1);
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#endif
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return g_object_ref_sink (object);
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}
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/**
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* gst_clear_object: (skip)
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* @object_ptr: a pointer to a #GstObject reference
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*
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* Clears a reference to a #GstObject.
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*
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* @object_ptr must not be %NULL.
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*
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* If the reference is %NULL then this function does nothing.
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* Otherwise, the reference count of the object is decreased using
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* gst_object_unref() and the pointer is set to %NULL.
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*
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* A macro is also included that allows this function to be used without
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* pointer casts.
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*
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* Since: 1.16
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**/
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#undef gst_clear_object
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void
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gst_clear_object (GstObject ** object_ptr)
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{
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g_clear_pointer (object_ptr, gst_object_unref);
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}
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/**
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* gst_object_replace:
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* @oldobj: (inout) (transfer full) (nullable): pointer to a place of
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* a #GstObject to replace
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* @newobj: (transfer none) (allow-none): a new #GstObject
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*
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* Atomically modifies a pointer to point to a new object.
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* The reference count of @oldobj is decreased and the reference count of
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* @newobj is increased.
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*
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* Either @newobj and the value pointed to by @oldobj may be %NULL.
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*
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* Returns: %TRUE if @newobj was different from @oldobj
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*/
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gboolean
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gst_object_replace (GstObject ** oldobj, GstObject * newobj)
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{
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GstObject *oldptr;
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g_return_val_if_fail (oldobj != NULL, FALSE);
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#ifdef DEBUG_REFCOUNT
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GST_CAT_TRACE (GST_CAT_REFCOUNTING, "replace %p %s (%d) with %p %s (%d)",
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*oldobj, *oldobj ? GST_STR_NULL (GST_OBJECT_NAME (*oldobj)) : "(NONE)",
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*oldobj ? G_OBJECT (*oldobj)->ref_count : 0,
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newobj, newobj ? GST_STR_NULL (GST_OBJECT_NAME (newobj)) : "(NONE)",
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newobj ? G_OBJECT (newobj)->ref_count : 0);
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#endif
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oldptr = g_atomic_pointer_get ((gpointer *) oldobj);
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if (G_UNLIKELY (oldptr == newobj))
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return FALSE;
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if (newobj)
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gst_object_ref (newobj);
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while (G_UNLIKELY (!g_atomic_pointer_compare_and_exchange ((gpointer *)
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oldobj, oldptr, newobj))) {
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oldptr = g_atomic_pointer_get ((gpointer *) oldobj);
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if (G_UNLIKELY (oldptr == newobj))
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break;
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}
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if (oldptr)
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gst_object_unref (oldptr);
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return oldptr != newobj;
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}
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/* dispose is called when the object has to release all links
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* to other objects */
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static void
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gst_object_dispose (GObject * object)
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{
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GstObject *self = (GstObject *) object;
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GstObject *parent;
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GST_CAT_TRACE_OBJECT (GST_CAT_REFCOUNTING, object, "%p dispose", object);
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GST_OBJECT_LOCK (object);
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if ((parent = GST_OBJECT_PARENT (object)))
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goto have_parent;
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GST_OBJECT_PARENT (object) = NULL;
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GST_OBJECT_UNLOCK (object);
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if (self->control_bindings) {
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GList *node;
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for (node = self->control_bindings; node; node = g_list_next (node)) {
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gst_object_unparent (node->data);
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}
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g_list_free (self->control_bindings);
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self->control_bindings = NULL;
|
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}
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|
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((GObjectClass *) gst_object_parent_class)->dispose (object);
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|
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return;
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|
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/* ERRORS */
|
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have_parent:
|
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{
|
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g_critical ("\nTrying to dispose object \"%s\", but it still has a "
|
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"parent \"%s\".\nYou need to let the parent manage the "
|
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"object instead of unreffing the object directly.\n",
|
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GST_OBJECT_NAME (object), GST_OBJECT_NAME (parent));
|
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GST_OBJECT_UNLOCK (object);
|
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/* ref the object again to revive it in this error case */
|
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gst_object_ref (object);
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return;
|
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}
|
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}
|
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|
|
/* finalize is called when the object has to free its resources */
|
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static void
|
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gst_object_finalize (GObject * object)
|
|
{
|
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GstObject *gstobject = GST_OBJECT_CAST (object);
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|
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GST_CAT_TRACE_OBJECT (GST_CAT_REFCOUNTING, object, "%p finalize", object);
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|
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g_signal_handlers_destroy (object);
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|
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g_free (gstobject->name);
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g_mutex_clear (&gstobject->lock);
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|
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GST_TRACER_OBJECT_DESTROYED (gstobject);
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|
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((GObjectClass *) gst_object_parent_class)->finalize (object);
|
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}
|
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|
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/* Changing a GObject property of a GstObject will result in "deep-notify"
|
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* signals being emitted by the object itself, as well as in each parent
|
|
* object. This is so that an application can connect a listener to the
|
|
* top-level bin to catch property-change notifications for all contained
|
|
* elements.
|
|
*
|
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* MT safe.
|
|
*/
|
|
static void
|
|
gst_object_dispatch_properties_changed (GObject * object,
|
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guint n_pspecs, GParamSpec ** pspecs)
|
|
{
|
|
GstObject *gst_object, *parent, *old_parent;
|
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guint i;
|
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#ifndef GST_DISABLE_GST_DEBUG
|
|
gchar *name = NULL;
|
|
const gchar *debug_name;
|
|
#endif
|
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|
|
/* do the standard dispatching */
|
|
((GObjectClass *)
|
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gst_object_parent_class)->dispatch_properties_changed (object, n_pspecs,
|
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pspecs);
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|
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gst_object = GST_OBJECT_CAST (object);
|
|
#ifndef GST_DISABLE_GST_DEBUG
|
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if (G_UNLIKELY (_gst_debug_min >= GST_LEVEL_LOG)) {
|
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name = gst_object_get_name (gst_object);
|
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debug_name = GST_STR_NULL (name);
|
|
} else
|
|
debug_name = "";
|
|
#endif
|
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|
|
/* now let the parent dispatch those, too */
|
|
parent = gst_object_get_parent (gst_object);
|
|
while (parent) {
|
|
for (i = 0; i < n_pspecs; i++) {
|
|
GST_CAT_LOG_OBJECT (GST_CAT_PROPERTIES, parent,
|
|
"deep notification from %s (%s)", debug_name, pspecs[i]->name);
|
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|
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g_signal_emit (parent, gst_object_signals[DEEP_NOTIFY],
|
|
g_quark_from_string (pspecs[i]->name), gst_object, pspecs[i]);
|
|
}
|
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|
|
old_parent = parent;
|
|
parent = gst_object_get_parent (old_parent);
|
|
gst_object_unref (old_parent);
|
|
}
|
|
#ifndef GST_DISABLE_GST_DEBUG
|
|
g_free (name);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* gst_object_default_deep_notify:
|
|
* @object: the #GObject that signalled the notify.
|
|
* @orig: a #GstObject that initiated the notify.
|
|
* @pspec: a #GParamSpec of the property.
|
|
* @excluded_props: (array zero-terminated=1) (element-type gchar*) (allow-none):
|
|
* a set of user-specified properties to exclude or %NULL to show
|
|
* all changes.
|
|
*
|
|
* A default deep_notify signal callback for an object. The user data
|
|
* should contain a pointer to an array of strings that should be excluded
|
|
* from the notify. The default handler will print the new value of the property
|
|
* using g_print.
|
|
*
|
|
* MT safe. This function grabs and releases @object's LOCK for getting its
|
|
* path string.
|
|
*/
|
|
void
|
|
gst_object_default_deep_notify (GObject * object, GstObject * orig,
|
|
GParamSpec * pspec, gchar ** excluded_props)
|
|
{
|
|
GValue value = { 0, }; /* the important thing is that value.type = 0 */
|
|
gchar *str = NULL;
|
|
gchar *name = NULL;
|
|
|
|
if (pspec->flags & G_PARAM_READABLE) {
|
|
/* let's not print these out for excluded properties... */
|
|
while (excluded_props != NULL && *excluded_props != NULL) {
|
|
if (strcmp (pspec->name, *excluded_props) == 0)
|
|
return;
|
|
excluded_props++;
|
|
}
|
|
g_value_init (&value, pspec->value_type);
|
|
g_object_get_property (G_OBJECT (orig), pspec->name, &value);
|
|
|
|
if (G_VALUE_HOLDS_STRING (&value))
|
|
str = g_value_dup_string (&value);
|
|
else
|
|
str = gst_value_serialize (&value);
|
|
name = gst_object_get_path_string (orig);
|
|
g_print ("%s: %s = %s\n", name, pspec->name, str);
|
|
g_free (name);
|
|
g_free (str);
|
|
g_value_unset (&value);
|
|
} else {
|
|
name = gst_object_get_path_string (orig);
|
|
g_warning ("Parameter %s not readable in %s.", pspec->name, name);
|
|
g_free (name);
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
gst_object_set_name_default (GstObject * object)
|
|
{
|
|
const gchar *type_name;
|
|
gint count;
|
|
gchar *name;
|
|
GQuark q;
|
|
guint i, l;
|
|
|
|
/* to ensure guaranteed uniqueness across threads, only one thread
|
|
* may ever assign a name */
|
|
G_LOCK (object_name_mutex);
|
|
|
|
if (!object_name_counts) {
|
|
g_datalist_init (&object_name_counts);
|
|
}
|
|
|
|
q = g_type_qname (G_OBJECT_TYPE (object));
|
|
count = GPOINTER_TO_INT (g_datalist_id_get_data (&object_name_counts, q));
|
|
g_datalist_id_set_data (&object_name_counts, q, GINT_TO_POINTER (count + 1));
|
|
|
|
G_UNLOCK (object_name_mutex);
|
|
|
|
/* GstFooSink -> foosink<N> */
|
|
type_name = g_quark_to_string (q);
|
|
if (strncmp (type_name, "Gst", 3) == 0)
|
|
type_name += 3;
|
|
/* give the 20th "queue" element and the first "queue2" different names */
|
|
l = strlen (type_name);
|
|
if (l > 0 && g_ascii_isdigit (type_name[l - 1])) {
|
|
name = g_strdup_printf ("%s-%d", type_name, count);
|
|
} else {
|
|
name = g_strdup_printf ("%s%d", type_name, count);
|
|
}
|
|
|
|
l = strlen (name);
|
|
for (i = 0; i < l; i++)
|
|
name[i] = g_ascii_tolower (name[i]);
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
if (G_UNLIKELY (object->parent != NULL))
|
|
goto had_parent;
|
|
|
|
g_free (object->name);
|
|
object->name = name;
|
|
|
|
GST_OBJECT_UNLOCK (object);
|
|
|
|
return TRUE;
|
|
|
|
had_parent:
|
|
{
|
|
g_free (name);
|
|
GST_WARNING ("parented objects can't be renamed");
|
|
GST_OBJECT_UNLOCK (object);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_object_set_name:
|
|
* @object: a #GstObject
|
|
* @name: (allow-none): new name of object
|
|
*
|
|
* Sets the name of @object, or gives @object a guaranteed unique
|
|
* name (if @name is %NULL).
|
|
* This function makes a copy of the provided name, so the caller
|
|
* retains ownership of the name it sent.
|
|
*
|
|
* Returns: %TRUE if the name could be set. Since Objects that have
|
|
* a parent cannot be renamed, this function returns %FALSE in those
|
|
* cases.
|
|
*
|
|
* MT safe. This function grabs and releases @object's LOCK.
|
|
*/
|
|
gboolean
|
|
gst_object_set_name (GstObject * object, const gchar * name)
|
|
{
|
|
gboolean result;
|
|
|
|
g_return_val_if_fail (GST_IS_OBJECT (object), FALSE);
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
|
|
/* parented objects cannot be renamed */
|
|
if (G_UNLIKELY (object->parent != NULL))
|
|
goto had_parent;
|
|
|
|
if (name != NULL) {
|
|
g_free (object->name);
|
|
object->name = g_strdup (name);
|
|
GST_OBJECT_UNLOCK (object);
|
|
result = TRUE;
|
|
} else {
|
|
GST_OBJECT_UNLOCK (object);
|
|
result = gst_object_set_name_default (object);
|
|
}
|
|
|
|
g_object_notify (G_OBJECT (object), "name");
|
|
return result;
|
|
|
|
/* error */
|
|
had_parent:
|
|
{
|
|
GST_WARNING ("parented objects can't be renamed");
|
|
GST_OBJECT_UNLOCK (object);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_object_get_name:
|
|
* @object: a #GstObject
|
|
*
|
|
* Returns a copy of the name of @object.
|
|
* Caller should g_free() the return value after usage.
|
|
* For a nameless object, this returns %NULL, which you can safely g_free()
|
|
* as well.
|
|
*
|
|
* Free-function: g_free
|
|
*
|
|
* Returns: (transfer full) (nullable): the name of @object. g_free()
|
|
* after usage.
|
|
*
|
|
* MT safe. This function grabs and releases @object's LOCK.
|
|
*/
|
|
gchar *
|
|
gst_object_get_name (GstObject * object)
|
|
{
|
|
gchar *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_OBJECT (object), NULL);
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
result = g_strdup (object->name);
|
|
GST_OBJECT_UNLOCK (object);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_object_set_parent:
|
|
* @object: (transfer floating): a #GstObject
|
|
* @parent: new parent of object
|
|
*
|
|
* Sets the parent of @object to @parent. The object's reference count will
|
|
* be incremented, and any floating reference will be removed (see gst_object_ref_sink()).
|
|
*
|
|
* Returns: %TRUE if @parent could be set or %FALSE when @object
|
|
* already had a parent or @object and @parent are the same.
|
|
*
|
|
* MT safe. Grabs and releases @object's LOCK.
|
|
*/
|
|
gboolean
|
|
gst_object_set_parent (GstObject * object, GstObject * parent)
|
|
{
|
|
g_return_val_if_fail (GST_IS_OBJECT (object), FALSE);
|
|
g_return_val_if_fail (GST_IS_OBJECT (parent), FALSE);
|
|
g_return_val_if_fail (object != parent, FALSE);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, object,
|
|
"set parent (ref and sink)");
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
if (G_UNLIKELY (object->parent != NULL))
|
|
goto had_parent;
|
|
|
|
object->parent = parent;
|
|
gst_object_ref_sink (object);
|
|
GST_OBJECT_UNLOCK (object);
|
|
|
|
/* FIXME-2.0: this does not work, the deep notify takes the lock from the
|
|
* parent object and deadlocks when the parent holds its lock when calling
|
|
* this function (like _element_add_pad()), we need to use a GRecMutex
|
|
* for locking the parent instead.
|
|
*/
|
|
/* g_object_notify_by_pspec ((GObject *)object, properties[PROP_PARENT]); */
|
|
|
|
return TRUE;
|
|
|
|
/* ERROR handling */
|
|
had_parent:
|
|
{
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, object,
|
|
"set parent failed, object already had a parent");
|
|
gst_object_ref_sink (object);
|
|
gst_object_unref (object);
|
|
GST_OBJECT_UNLOCK (object);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_object_get_parent:
|
|
* @object: a #GstObject
|
|
*
|
|
* Returns the parent of @object. This function increases the refcount
|
|
* of the parent object so you should gst_object_unref() it after usage.
|
|
*
|
|
* Returns: (transfer full) (nullable): parent of @object, this can be
|
|
* %NULL if @object has no parent. unref after usage.
|
|
*
|
|
* MT safe. Grabs and releases @object's LOCK.
|
|
*/
|
|
GstObject *
|
|
gst_object_get_parent (GstObject * object)
|
|
{
|
|
GstObject *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_OBJECT (object), NULL);
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
result = object->parent;
|
|
if (G_LIKELY (result))
|
|
gst_object_ref (result);
|
|
GST_OBJECT_UNLOCK (object);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_object_unparent:
|
|
* @object: a #GstObject to unparent
|
|
*
|
|
* Clear the parent of @object, removing the associated reference.
|
|
* This function decreases the refcount of @object.
|
|
*
|
|
* MT safe. Grabs and releases @object's lock.
|
|
*/
|
|
void
|
|
gst_object_unparent (GstObject * object)
|
|
{
|
|
GstObject *parent;
|
|
|
|
g_return_if_fail (GST_IS_OBJECT (object));
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
parent = object->parent;
|
|
|
|
if (G_LIKELY (parent != NULL)) {
|
|
GST_CAT_TRACE_OBJECT (GST_CAT_REFCOUNTING, object, "unparent");
|
|
object->parent = NULL;
|
|
GST_OBJECT_UNLOCK (object);
|
|
|
|
/* g_object_notify_by_pspec ((GObject *)object, properties[PROP_PARENT]); */
|
|
|
|
gst_object_unref (object);
|
|
} else {
|
|
GST_OBJECT_UNLOCK (object);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_object_has_as_parent:
|
|
* @object: a #GstObject to check
|
|
* @parent: a #GstObject to check as parent
|
|
*
|
|
* Check if @parent is the parent of @object.
|
|
* E.g. a #GstElement can check if it owns a given #GstPad.
|
|
*
|
|
* Returns: %FALSE if either @object or @parent is %NULL. %TRUE if @parent is
|
|
* the parent of @object. Otherwise %FALSE.
|
|
*
|
|
* MT safe. Grabs and releases @object's locks.
|
|
* Since: 1.6
|
|
*/
|
|
gboolean
|
|
gst_object_has_as_parent (GstObject * object, GstObject * parent)
|
|
{
|
|
gboolean result = FALSE;
|
|
|
|
if (G_LIKELY (GST_IS_OBJECT (object) && GST_IS_OBJECT (parent))) {
|
|
GST_OBJECT_LOCK (object);
|
|
result = GST_OBJECT_PARENT (object) == parent;
|
|
GST_OBJECT_UNLOCK (object);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_object_has_as_ancestor:
|
|
* @object: a #GstObject to check
|
|
* @ancestor: a #GstObject to check as ancestor
|
|
*
|
|
* Check if @object has an ancestor @ancestor somewhere up in
|
|
* the hierarchy. One can e.g. check if a #GstElement is inside a #GstPipeline.
|
|
*
|
|
* Returns: %TRUE if @ancestor is an ancestor of @object.
|
|
*
|
|
* MT safe. Grabs and releases @object's locks.
|
|
*/
|
|
gboolean
|
|
gst_object_has_as_ancestor (GstObject * object, GstObject * ancestor)
|
|
{
|
|
GstObject *parent, *tmp;
|
|
|
|
if (!ancestor || !object)
|
|
return FALSE;
|
|
|
|
parent = gst_object_ref (object);
|
|
do {
|
|
if (parent == ancestor) {
|
|
gst_object_unref (parent);
|
|
return TRUE;
|
|
}
|
|
|
|
tmp = gst_object_get_parent (parent);
|
|
gst_object_unref (parent);
|
|
parent = tmp;
|
|
} while (parent);
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* gst_object_has_ancestor:
|
|
* @object: a #GstObject to check
|
|
* @ancestor: a #GstObject to check as ancestor
|
|
*
|
|
* Check if @object has an ancestor @ancestor somewhere up in
|
|
* the hierarchy. One can e.g. check if a #GstElement is inside a #GstPipeline.
|
|
*
|
|
* Returns: %TRUE if @ancestor is an ancestor of @object.
|
|
*
|
|
* Deprecated: Use gst_object_has_as_ancestor() instead.
|
|
*
|
|
* MT safe. Grabs and releases @object's locks.
|
|
*/
|
|
#ifndef GST_REMOVE_DEPRECATED
|
|
gboolean
|
|
gst_object_has_ancestor (GstObject * object, GstObject * ancestor)
|
|
{
|
|
return gst_object_has_as_ancestor (object, ancestor);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* gst_object_check_uniqueness:
|
|
* @list: (transfer none) (element-type Gst.Object): a list of #GstObject to
|
|
* check through
|
|
* @name: the name to search for
|
|
*
|
|
* Checks to see if there is any object named @name in @list. This function
|
|
* does not do any locking of any kind. You might want to protect the
|
|
* provided list with the lock of the owner of the list. This function
|
|
* will lock each #GstObject in the list to compare the name, so be
|
|
* careful when passing a list with a locked object.
|
|
*
|
|
* Returns: %TRUE if a #GstObject named @name does not appear in @list,
|
|
* %FALSE if it does.
|
|
*
|
|
* MT safe. Grabs and releases the LOCK of each object in the list.
|
|
*/
|
|
gboolean
|
|
gst_object_check_uniqueness (GList * list, const gchar * name)
|
|
{
|
|
gboolean result = TRUE;
|
|
|
|
g_return_val_if_fail (name != NULL, FALSE);
|
|
|
|
for (; list; list = g_list_next (list)) {
|
|
GstObject *child;
|
|
gboolean eq;
|
|
|
|
child = GST_OBJECT_CAST (list->data);
|
|
|
|
GST_OBJECT_LOCK (child);
|
|
eq = strcmp (GST_OBJECT_NAME (child), name) == 0;
|
|
GST_OBJECT_UNLOCK (child);
|
|
|
|
if (G_UNLIKELY (eq)) {
|
|
result = FALSE;
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
static void
|
|
gst_object_set_property (GObject * object, guint prop_id,
|
|
const GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstObject *gstobject;
|
|
|
|
gstobject = GST_OBJECT_CAST (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_NAME:
|
|
gst_object_set_name (gstobject, g_value_get_string (value));
|
|
break;
|
|
case PROP_PARENT:
|
|
gst_object_set_parent (gstobject, g_value_get_object (value));
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_object_get_property (GObject * object, guint prop_id,
|
|
GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstObject *gstobject;
|
|
|
|
gstobject = GST_OBJECT_CAST (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_NAME:
|
|
g_value_take_string (value, gst_object_get_name (gstobject));
|
|
break;
|
|
case PROP_PARENT:
|
|
g_value_take_object (value, gst_object_get_parent (gstobject));
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_object_get_path_string:
|
|
* @object: a #GstObject
|
|
*
|
|
* Generates a string describing the path of @object in
|
|
* the object hierarchy. Only useful (or used) for debugging.
|
|
*
|
|
* Free-function: g_free
|
|
*
|
|
* Returns: (transfer full): a string describing the path of @object. You must
|
|
* g_free() the string after usage.
|
|
*
|
|
* MT safe. Grabs and releases the #GstObject's LOCK for all objects
|
|
* in the hierarchy.
|
|
*/
|
|
gchar *
|
|
gst_object_get_path_string (GstObject * object)
|
|
{
|
|
GSList *parentage;
|
|
GSList *parents;
|
|
void *parent;
|
|
gchar *prevpath, *path;
|
|
const gchar *typename;
|
|
gchar *component;
|
|
const gchar *separator;
|
|
|
|
/* ref object before adding to list */
|
|
gst_object_ref (object);
|
|
parentage = g_slist_prepend (NULL, object);
|
|
|
|
path = g_strdup ("");
|
|
|
|
/* first walk the object hierarchy to build a list of the parents,
|
|
* be careful here with refcounting. */
|
|
do {
|
|
if (GST_IS_OBJECT (object)) {
|
|
parent = gst_object_get_parent (object);
|
|
/* add parents to list, refcount remains increased while
|
|
* we handle the object */
|
|
if (parent)
|
|
parentage = g_slist_prepend (parentage, parent);
|
|
} else {
|
|
break;
|
|
}
|
|
object = parent;
|
|
} while (object != NULL);
|
|
|
|
/* then walk the parent list and print them out. we need to
|
|
* decrease the refcounting on each element after we handled
|
|
* it. */
|
|
for (parents = parentage; parents; parents = g_slist_next (parents)) {
|
|
if (G_IS_OBJECT (parents->data)) {
|
|
typename = G_OBJECT_TYPE_NAME (parents->data);
|
|
} else {
|
|
typename = NULL;
|
|
}
|
|
if (GST_IS_OBJECT (parents->data)) {
|
|
GstObject *item = GST_OBJECT_CAST (parents->data);
|
|
GstObjectClass *oclass = GST_OBJECT_GET_CLASS (item);
|
|
gchar *objname = gst_object_get_name (item);
|
|
|
|
component = g_strdup_printf ("%s:%s", typename, objname);
|
|
separator = oclass->path_string_separator;
|
|
/* and unref now */
|
|
gst_object_unref (item);
|
|
g_free (objname);
|
|
} else {
|
|
if (typename) {
|
|
component = g_strdup_printf ("%s:%p", typename, parents->data);
|
|
} else {
|
|
component = g_strdup_printf ("%p", parents->data);
|
|
}
|
|
separator = "/";
|
|
}
|
|
|
|
prevpath = path;
|
|
path = g_strjoin (separator, prevpath, component, NULL);
|
|
g_free (prevpath);
|
|
g_free (component);
|
|
}
|
|
|
|
g_slist_free (parentage);
|
|
|
|
return path;
|
|
}
|
|
|
|
/* controller helper functions */
|
|
|
|
/*
|
|
* gst_object_find_control_binding:
|
|
* @self: the gobject to search for a property in
|
|
* @name: the gobject property name to look for
|
|
*
|
|
* Searches the list of properties under control.
|
|
*
|
|
* Returns: (nullable): a #GstControlBinding or %NULL if the property
|
|
* is not being controlled.
|
|
*/
|
|
static GstControlBinding *
|
|
gst_object_find_control_binding (GstObject * self, const gchar * name)
|
|
{
|
|
GstControlBinding *binding;
|
|
GList *node;
|
|
|
|
for (node = self->control_bindings; node; node = g_list_next (node)) {
|
|
binding = node->data;
|
|
/* FIXME: eventually use GQuark to speed it up */
|
|
if (!strcmp (binding->name, name)) {
|
|
GST_DEBUG_OBJECT (self, "found control binding for property '%s'", name);
|
|
return binding;
|
|
}
|
|
}
|
|
GST_DEBUG_OBJECT (self, "controller does not manage property '%s'", name);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* controller functions */
|
|
|
|
/**
|
|
* gst_object_suggest_next_sync:
|
|
* @object: the object that has controlled properties
|
|
*
|
|
* Returns a suggestion for timestamps where buffers should be split
|
|
* to get best controller results.
|
|
*
|
|
* Returns: Returns the suggested timestamp or %GST_CLOCK_TIME_NONE
|
|
* if no control-rate was set.
|
|
*/
|
|
GstClockTime
|
|
gst_object_suggest_next_sync (GstObject * object)
|
|
{
|
|
GstClockTime ret;
|
|
|
|
g_return_val_if_fail (GST_IS_OBJECT (object), GST_CLOCK_TIME_NONE);
|
|
g_return_val_if_fail (object->control_rate != GST_CLOCK_TIME_NONE,
|
|
GST_CLOCK_TIME_NONE);
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
|
|
/* TODO: Implement more logic, depending on interpolation mode and control
|
|
* points
|
|
* FIXME: we need playback direction
|
|
*/
|
|
ret = object->last_sync + object->control_rate;
|
|
|
|
GST_OBJECT_UNLOCK (object);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_object_sync_values:
|
|
* @object: the object that has controlled properties
|
|
* @timestamp: the time that should be processed
|
|
*
|
|
* Sets the properties of the object, according to the #GstControlSources that
|
|
* (maybe) handle them and for the given timestamp.
|
|
*
|
|
* If this function fails, it is most likely the application developers fault.
|
|
* Most probably the control sources are not setup correctly.
|
|
*
|
|
* Returns: %TRUE if the controller values could be applied to the object
|
|
* properties, %FALSE otherwise
|
|
*/
|
|
gboolean
|
|
gst_object_sync_values (GstObject * object, GstClockTime timestamp)
|
|
{
|
|
GList *node;
|
|
gboolean ret = TRUE;
|
|
|
|
g_return_val_if_fail (GST_IS_OBJECT (object), FALSE);
|
|
g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), FALSE);
|
|
|
|
GST_LOG_OBJECT (object, "sync_values");
|
|
if (!object->control_bindings)
|
|
return TRUE;
|
|
|
|
/* FIXME: this deadlocks */
|
|
/* GST_OBJECT_LOCK (object); */
|
|
g_object_freeze_notify ((GObject *) object);
|
|
for (node = object->control_bindings; node; node = g_list_next (node)) {
|
|
ret &= gst_control_binding_sync_values ((GstControlBinding *) node->data,
|
|
object, timestamp, object->last_sync);
|
|
}
|
|
object->last_sync = timestamp;
|
|
g_object_thaw_notify ((GObject *) object);
|
|
/* GST_OBJECT_UNLOCK (object); */
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_object_has_active_control_bindings:
|
|
* @object: the object that has controlled properties
|
|
*
|
|
* Check if the @object has active controlled properties.
|
|
*
|
|
* Returns: %TRUE if the object has active controlled properties
|
|
*/
|
|
gboolean
|
|
gst_object_has_active_control_bindings (GstObject * object)
|
|
{
|
|
gboolean res = FALSE;
|
|
GList *node;
|
|
|
|
g_return_val_if_fail (GST_IS_OBJECT (object), FALSE);
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
for (node = object->control_bindings; node; node = g_list_next (node)) {
|
|
res |= !gst_control_binding_is_disabled ((GstControlBinding *) node->data);
|
|
}
|
|
GST_OBJECT_UNLOCK (object);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* gst_object_set_control_bindings_disabled:
|
|
* @object: the object that has controlled properties
|
|
* @disabled: boolean that specifies whether to disable the controller
|
|
* or not.
|
|
*
|
|
* This function is used to disable all controlled properties of the @object for
|
|
* some time, i.e. gst_object_sync_values() will do nothing.
|
|
*/
|
|
void
|
|
gst_object_set_control_bindings_disabled (GstObject * object, gboolean disabled)
|
|
{
|
|
GList *node;
|
|
|
|
g_return_if_fail (GST_IS_OBJECT (object));
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
for (node = object->control_bindings; node; node = g_list_next (node)) {
|
|
gst_control_binding_set_disabled ((GstControlBinding *) node->data,
|
|
disabled);
|
|
}
|
|
GST_OBJECT_UNLOCK (object);
|
|
}
|
|
|
|
/**
|
|
* gst_object_set_control_binding_disabled:
|
|
* @object: the object that has controlled properties
|
|
* @property_name: property to disable
|
|
* @disabled: boolean that specifies whether to disable the controller
|
|
* or not.
|
|
*
|
|
* This function is used to disable the control bindings on a property for
|
|
* some time, i.e. gst_object_sync_values() will do nothing for the
|
|
* property.
|
|
*/
|
|
void
|
|
gst_object_set_control_binding_disabled (GstObject * object,
|
|
const gchar * property_name, gboolean disabled)
|
|
{
|
|
GstControlBinding *binding;
|
|
|
|
g_return_if_fail (GST_IS_OBJECT (object));
|
|
g_return_if_fail (property_name);
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
if ((binding = gst_object_find_control_binding (object, property_name))) {
|
|
gst_control_binding_set_disabled (binding, disabled);
|
|
}
|
|
GST_OBJECT_UNLOCK (object);
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_object_add_control_binding:
|
|
* @object: the controller object
|
|
* @binding: (transfer floating): the #GstControlBinding that should be used
|
|
*
|
|
* Attach the #GstControlBinding to the object. If there already was a
|
|
* #GstControlBinding for this property it will be replaced.
|
|
*
|
|
* The object's reference count will be incremented, and any floating
|
|
* reference will be removed (see gst_object_ref_sink())
|
|
*
|
|
* Returns: %FALSE if the given @binding has not been setup for this object or
|
|
* has been setup for a non suitable property, %TRUE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_object_add_control_binding (GstObject * object, GstControlBinding * binding)
|
|
{
|
|
GstControlBinding *old;
|
|
|
|
g_return_val_if_fail (GST_IS_OBJECT (object), FALSE);
|
|
g_return_val_if_fail (GST_IS_CONTROL_BINDING (binding), FALSE);
|
|
g_return_val_if_fail (binding->pspec, FALSE);
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
if ((old = gst_object_find_control_binding (object, binding->name))) {
|
|
GST_DEBUG_OBJECT (object, "controlled property %s removed", old->name);
|
|
object->control_bindings = g_list_remove (object->control_bindings, old);
|
|
gst_object_unparent (GST_OBJECT_CAST (old));
|
|
}
|
|
object->control_bindings = g_list_prepend (object->control_bindings, binding);
|
|
gst_object_set_parent (GST_OBJECT_CAST (binding), object);
|
|
GST_DEBUG_OBJECT (object, "controlled property %s added", binding->name);
|
|
GST_OBJECT_UNLOCK (object);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_object_get_control_binding:
|
|
* @object: the object
|
|
* @property_name: name of the property
|
|
*
|
|
* Gets the corresponding #GstControlBinding for the property. This should be
|
|
* unreferenced again after use.
|
|
*
|
|
* Returns: (transfer full) (nullable): the #GstControlBinding for
|
|
* @property_name or %NULL if the property is not controlled.
|
|
*/
|
|
GstControlBinding *
|
|
gst_object_get_control_binding (GstObject * object, const gchar * property_name)
|
|
{
|
|
GstControlBinding *binding;
|
|
|
|
g_return_val_if_fail (GST_IS_OBJECT (object), NULL);
|
|
g_return_val_if_fail (property_name, NULL);
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
if ((binding = gst_object_find_control_binding (object, property_name))) {
|
|
gst_object_ref (binding);
|
|
}
|
|
GST_OBJECT_UNLOCK (object);
|
|
|
|
return binding;
|
|
}
|
|
|
|
/**
|
|
* gst_object_remove_control_binding:
|
|
* @object: the object
|
|
* @binding: the binding
|
|
*
|
|
* Removes the corresponding #GstControlBinding. If it was the
|
|
* last ref of the binding, it will be disposed.
|
|
*
|
|
* Returns: %TRUE if the binding could be removed.
|
|
*/
|
|
gboolean
|
|
gst_object_remove_control_binding (GstObject * object,
|
|
GstControlBinding * binding)
|
|
{
|
|
GList *node;
|
|
gboolean ret = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_OBJECT (object), FALSE);
|
|
g_return_val_if_fail (GST_IS_CONTROL_BINDING (binding), FALSE);
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
if ((node = g_list_find (object->control_bindings, binding))) {
|
|
GST_DEBUG_OBJECT (object, "controlled property %s removed", binding->name);
|
|
object->control_bindings =
|
|
g_list_delete_link (object->control_bindings, node);
|
|
gst_object_unparent (GST_OBJECT_CAST (binding));
|
|
ret = TRUE;
|
|
}
|
|
GST_OBJECT_UNLOCK (object);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_object_get_value:
|
|
* @object: the object that has controlled properties
|
|
* @property_name: the name of the property to get
|
|
* @timestamp: the time the control-change should be read from
|
|
*
|
|
* Gets the value for the given controlled property at the requested time.
|
|
*
|
|
* Returns: (nullable): the GValue of the property at the given time,
|
|
* or %NULL if the property isn't controlled.
|
|
*/
|
|
GValue *
|
|
gst_object_get_value (GstObject * object, const gchar * property_name,
|
|
GstClockTime timestamp)
|
|
{
|
|
GstControlBinding *binding;
|
|
GValue *val = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_OBJECT (object), NULL);
|
|
g_return_val_if_fail (property_name, NULL);
|
|
g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), NULL);
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
if ((binding = gst_object_find_control_binding (object, property_name))) {
|
|
val = gst_control_binding_get_value (binding, timestamp);
|
|
}
|
|
GST_OBJECT_UNLOCK (object);
|
|
|
|
return val;
|
|
}
|
|
|
|
/**
|
|
* gst_object_get_value_array: (skip)
|
|
* @object: the object that has controlled properties
|
|
* @property_name: the name of the property to get
|
|
* @timestamp: the time that should be processed
|
|
* @interval: the time spacing between subsequent values
|
|
* @n_values: the number of values
|
|
* @values: array to put control-values in
|
|
*
|
|
* Gets a number of values for the given controlled property starting at the
|
|
* requested time. The array @values need to hold enough space for @n_values of
|
|
* the same type as the objects property's type.
|
|
*
|
|
* This function is useful if one wants to e.g. draw a graph of the control
|
|
* curve or apply a control curve sample by sample.
|
|
*
|
|
* The values are unboxed and ready to be used. The similar function
|
|
* gst_object_get_g_value_array() returns the array as #GValues and is
|
|
* better suites for bindings.
|
|
*
|
|
* Returns: %TRUE if the given array could be filled, %FALSE otherwise
|
|
*/
|
|
gboolean
|
|
gst_object_get_value_array (GstObject * object, const gchar * property_name,
|
|
GstClockTime timestamp, GstClockTime interval, guint n_values,
|
|
gpointer values)
|
|
{
|
|
gboolean res = FALSE;
|
|
GstControlBinding *binding;
|
|
|
|
g_return_val_if_fail (GST_IS_OBJECT (object), FALSE);
|
|
g_return_val_if_fail (property_name, FALSE);
|
|
g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), FALSE);
|
|
g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (interval), FALSE);
|
|
g_return_val_if_fail (values, FALSE);
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
if ((binding = gst_object_find_control_binding (object, property_name))) {
|
|
res = gst_control_binding_get_value_array (binding, timestamp, interval,
|
|
n_values, values);
|
|
}
|
|
GST_OBJECT_UNLOCK (object);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* gst_object_get_g_value_array:
|
|
* @object: the object that has controlled properties
|
|
* @property_name: the name of the property to get
|
|
* @timestamp: the time that should be processed
|
|
* @interval: the time spacing between subsequent values
|
|
* @n_values: the number of values
|
|
* @values: (array length=n_values): array to put control-values in
|
|
*
|
|
* Gets a number of #GValues for the given controlled property starting at the
|
|
* requested time. The array @values need to hold enough space for @n_values of
|
|
* #GValue.
|
|
*
|
|
* This function is useful if one wants to e.g. draw a graph of the control
|
|
* curve or apply a control curve sample by sample.
|
|
*
|
|
* Returns: %TRUE if the given array could be filled, %FALSE otherwise
|
|
*/
|
|
gboolean
|
|
gst_object_get_g_value_array (GstObject * object, const gchar * property_name,
|
|
GstClockTime timestamp, GstClockTime interval, guint n_values,
|
|
GValue * values)
|
|
{
|
|
gboolean res = FALSE;
|
|
GstControlBinding *binding;
|
|
|
|
g_return_val_if_fail (GST_IS_OBJECT (object), FALSE);
|
|
g_return_val_if_fail (property_name, FALSE);
|
|
g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), FALSE);
|
|
g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (interval), FALSE);
|
|
g_return_val_if_fail (values, FALSE);
|
|
|
|
GST_OBJECT_LOCK (object);
|
|
if ((binding = gst_object_find_control_binding (object, property_name))) {
|
|
res = gst_control_binding_get_g_value_array (binding, timestamp, interval,
|
|
n_values, values);
|
|
}
|
|
GST_OBJECT_UNLOCK (object);
|
|
return res;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_object_get_control_rate:
|
|
* @object: the object that has controlled properties
|
|
*
|
|
* Obtain the control-rate for this @object. Audio processing #GstElement
|
|
* objects will use this rate to sub-divide their processing loop and call
|
|
* gst_object_sync_values() in between. The length of the processing segment
|
|
* should be up to @control-rate nanoseconds.
|
|
*
|
|
* If the @object is not under property control, this will return
|
|
* %GST_CLOCK_TIME_NONE. This allows the element to avoid the sub-dividing.
|
|
*
|
|
* The control-rate is not expected to change if the element is in
|
|
* %GST_STATE_PAUSED or %GST_STATE_PLAYING.
|
|
*
|
|
* Returns: the control rate in nanoseconds
|
|
*/
|
|
GstClockTime
|
|
gst_object_get_control_rate (GstObject * object)
|
|
{
|
|
g_return_val_if_fail (GST_IS_OBJECT (object), FALSE);
|
|
|
|
return object->control_rate;
|
|
}
|
|
|
|
/**
|
|
* gst_object_set_control_rate:
|
|
* @object: the object that has controlled properties
|
|
* @control_rate: the new control-rate in nanoseconds.
|
|
*
|
|
* Change the control-rate for this @object. Audio processing #GstElement
|
|
* objects will use this rate to sub-divide their processing loop and call
|
|
* gst_object_sync_values() in between. The length of the processing segment
|
|
* should be up to @control-rate nanoseconds.
|
|
*
|
|
* The control-rate should not change if the element is in %GST_STATE_PAUSED or
|
|
* %GST_STATE_PLAYING.
|
|
*/
|
|
void
|
|
gst_object_set_control_rate (GstObject * object, GstClockTime control_rate)
|
|
{
|
|
g_return_if_fail (GST_IS_OBJECT (object));
|
|
|
|
object->control_rate = control_rate;
|
|
}
|