gstreamer/libs/gst/controller/gstproxycontrolbinding.h
Matthew Waters 3eb4896435 controllers: add new proxy control binding
Allows proxying the control interface from one property on one GstObject
to another property (of the same type) in another GstObject.

E.g. in a parent-child relationship, one may need to
gst_object_sync_values() on the child and have a binding (set elsewhere)
on the parent update the value.

Note: that this doesn't solve GObject property forwarding and must be
taken care of by the implementation manually or using GBinding.

https://bugzilla.gnome.org/show_bug.cgi?id=774657
2016-11-23 17:15:09 +11:00

83 lines
2.8 KiB
C

/*
* GStreamer
* Copyright (C) 2016 Matthew Waters <matthew@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_PROXY_CONTROL_BINDING_H__
#define __GST_PROXY_CONTROL_BINDING_H__
#include <gst/gst.h>
G_BEGIN_DECLS
GType gst_proxy_control_binding_get_type (void);
#define GST_TYPE_PROXY_CONTROL_BINDING (gst_proxy_control_binding_get_type())
#define GST_PROXY_CONTROL_BINDING(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PROXY_CONTROL_BINDING,GstProxyControlBinding))
#define GST_PROXY_CONTROL_BINDING_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_PROXY_CONTROL_BINDING,GstProxyControlBindingClass))
#define GST_IS_PROXY_CONTROL_BINDING(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_PROXY_CONTROL_BINDING))
#define GST_IS_PROXY_CONTROL_BINDING_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_PROXY_CONTROL_BINDING))
#define GST_PROXY_CONTROL_BINDING_GET_CLASS(obj) \
(G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_CONTOL_SOURCE, GstProxyControlBindingClass))
typedef struct _GstProxyControlBinding GstProxyControlBinding;
typedef struct _GstProxyControlBindingClass GstProxyControlBindingClass;
/**
* GstProxyControlBinding:
*
* Opaque #GstProxyControlBinding struct
*/
struct _GstProxyControlBinding
{
/* <private> */
GstControlBinding parent;
GWeakRef ref_object;
gchar *property_name;
gpointer _padding[GST_PADDING];
};
/**
* GstProxyControlBindingClass:
*
* Opaque #GstProxyControlBindingClass struct
*/
struct _GstProxyControlBindingClass
{
/* <private> */
GstControlBindingClass parent_class;
gpointer _padding[GST_PADDING];
};
GstControlBinding * gst_proxy_control_binding_new (GstObject * object,
const gchar * property_name,
GstObject * ref_object,
const gchar * ref_property_name);
#ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstProxyControlBinding, gst_object_unref)
#endif
G_END_DECLS
#endif /* __GST_PROXY_CONTROL_BINDING_H__ */