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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstinterface.h: Declarations of interface stuff
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_IMPLEMENTS_INTERFACE_H__
#define __GST_IMPLEMENTS_INTERFACE_H__
#include <gst/gstelement.h>
G_BEGIN_DECLS
#define GST_TYPE_IMPLEMENTS_INTERFACE \
(gst_implements_interface_get_type ())
#define GST_IMPLEMENTS_INTERFACE(obj) \
(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_IMPLEMENTS_INTERFACE, \
GstImplementsInterface))
#define GST_IMPLEMENTS_INTERFACE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_IMPLEMENTS_INTERFACE, \
GstImplementsInterfaceClass))
#define GST_IS_IMPLEMENTS_INTERFACE(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_IMPLEMENTS_INTERFACE))
#define GST_IS_IMPLEMENTS_INTERFACE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_IMPLEMENTS_INTERFACE))
#define GST_IMPLEMENTS_INTERFACE_GET_CLASS(inst) \
(G_TYPE_INSTANCE_GET_INTERFACE ((inst), GST_TYPE_IMPLEMENTS_INTERFACE, \
GstImplementsInterfaceClass))
/**
* GstImplementsInterface:
*
* Opaque #GstImplementsInterface structure.
*/
typedef struct _GstImplementsInterface GstImplementsInterface;
typedef struct _GstImplementsInterfaceClass GstImplementsInterfaceClass;
/* This small extra virtual function is here to provide an
* interface functionality on a per-instance basis rather
* than a per-class basis, which is the case for glib.
*/
struct _GstImplementsInterfaceClass {
GTypeInterface parent;
/* virtual functions */
gboolean (* supported) (GstImplementsInterface *iface,
GType iface_type);
gpointer _gst_reserved[GST_PADDING];
};
#define GST_IMPLEMENTS_INTERFACE_CHECK_INSTANCE_CAST(obj, type, cast_t) \
((cast_t *) gst_implements_interface_cast ((obj), (type)))
#define GST_IMPLEMENTS_INTERFACE_CHECK_INSTANCE_TYPE(obj, type) \
(gst_implements_interface_check ((obj), (type)))
GType gst_implements_interface_get_type (void);
/* wrapper functions to check for functionality implementation */
gboolean gst_element_implements_interface (GstElement *element,
GType iface_type);
gpointer gst_implements_interface_cast (gpointer from,
GType type);
gboolean gst_implements_interface_check (gpointer from,
GType type);
G_END_DECLS
#endif /* __GST_IMPLEMENTS_INTERFACE_H__ */
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