/* 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_IS_IMPLEMENTS_INTERFACE(obj) \

  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), 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)))

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GType	 gst_implements_interface_get_type    (void);

/* wrapper functions to check for functionality implementation */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

gboolean gst_element_implements_interface     (GstElement *element,

					       GType       iface_type);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

gpointer gst_implements_interface_cast	      (gpointer    from,

					       GType       type);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

gboolean gst_implements_interface_check	      (gpointer    from,

					       GType       type);

G_END_DECLS

#endif /* __GST_IMPLEMENTS_INTERFACE_H__ */