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77 lines
2.6 KiB
C
77 lines
2.6 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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*
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* gstinterface.h: Declarations of interface stuff
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_INTERFACE_H__
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#define __GST_INTERFACE_H__
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#include <gst/gstelement.h>
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G_BEGIN_DECLS
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#define GST_TYPE_INTERFACE \
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(gst_interface_get_type ())
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#define GST_INTERFACE(obj) \
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(GST_INTERFACE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_INTERFACE, GstInterface))
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#define GST_INTERFACE_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_INTERFACE, GstInterfaceClass))
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#define GST_IS_INTERFACE(obj) \
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(GST_INTERFACE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_INTERFACE))
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#define GST_IS_INTERFACE_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_INTERFACE))
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#define GST_INTERFACE_GET_CLASS(inst) \
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(G_TYPE_INSTANCE_GET_INTERFACE ((inst), GST_TYPE_INTERFACE, GstInterfaceClass))
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typedef struct _GstInterface GstInterface;
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/* This small extra virtual function is here to provide an
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* interface functionality on a per-instance basis rather
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* than a per-class basis, which is the case for glib.
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*/
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typedef struct _GstInterfaceClass {
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GTypeInterface parent;
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/* virtual functions */
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gboolean (* supported) (GstInterface *iface,
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GType iface_type);
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GST_CLASS_PADDING
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} GstInterfaceClass;
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#define GST_INTERFACE_CHECK_INSTANCE_CAST(obj, type, cast_t) \
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((cast_t *) gst_interface_cast ((obj), (type)))
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#define GST_INTERFACE_CHECK_INSTANCE_TYPE(obj, type) \
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(gst_interface_check ((obj), (type)))
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GType gst_interface_get_type (void);
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/* wrapper functions to check for functionality implementation */
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gboolean gst_element_implements_interface(GstElement *element,
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GType iface_type);
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GstInterface * gst_interface_cast (gpointer from,
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GType type);
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gboolean gst_interface_check (gpointer from,
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GType type);
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G_END_DECLS
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#endif /* __GST_INTERFACE_H__ */
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