| 1 | /* GStreamer |
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| 2 | * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> |
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| 3 | * 2000 Wim Taymans <wtay@chello.be> |
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| 4 | * |
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| 5 | * gstinterface.h: Declarations of interface stuff |
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| 6 | * |
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| 7 | * This library is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Library General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * This library is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Library General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Library General Public |
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| 18 | * License along with this library; if not, write to the |
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| 19 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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| 20 | * Boston, MA 02111-1307, USA. |
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| 21 | */ |
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| 22 | |
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| 23 | #ifndef __GST_IMPLEMENTS_INTERFACE_H__ |
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| 24 | #define __GST_IMPLEMENTS_INTERFACE_H__ |
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| 25 | |
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| 26 | #include <gst/gstelement.h> |
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| 27 | |
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| 28 | G_BEGIN_DECLS |
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| 29 | |
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| 30 | #define GST_TYPE_IMPLEMENTS_INTERFACE \ |
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| 31 | (gst_implements_interface_get_type ()) |
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| 32 | #define GST_IMPLEMENTS_INTERFACE(obj) \ |
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| 33 | (GST_INTERFACE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_IMPLEMENTS_INTERFACE, \ |
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| 34 | GstImplementsInterface)) |
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| 35 | #define GST_IMPLEMENTS_INTERFACE_CLASS(klass) \ |
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| 36 | (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_IMPLEMENTS_INTERFACE, \ |
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| 37 | GstImplementsInterfaceClass)) |
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| 38 | #define GST_IS_IMPLEMENTS_INTERFACE(obj) \ |
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| 39 | (GST_INTERFACE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_IMPLEMENTS_INTERFACE)) |
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| 40 | #define GST_IS_IMPLEMENTS_INTERFACE_CLASS(klass) \ |
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| 41 | (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_IMPLEMENTS_INTERFACE)) |
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| 42 | #define GST_IMPLEMENTS_INTERFACE_GET_CLASS(inst) \ |
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| 43 | (G_TYPE_INSTANCE_GET_INTERFACE ((inst), GST_TYPE_IMPLEMENTS_INTERFACE, \ |
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| 44 | GstImplementsInterfaceClass)) |
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| 45 | |
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| 46 | typedef struct _GstImplementsInterface GstImplementsInterface; |
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| 47 | |
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| 48 | typedef struct _GstImplementsInterfaceClass GstImplementsInterfaceClass; |
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| 49 | |
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| 50 | /* This small extra virtual function is here to provide an |
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| 51 | * interface functionality on a per-instance basis rather |
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| 52 | * than a per-class basis, which is the case for glib. |
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| 53 | */ |
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| 54 | struct _GstImplementsInterfaceClass { |
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| 55 | GTypeInterface parent; |
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| 56 | |
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| 57 | /* virtual functions */ |
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| 58 | gboolean (* supported) (GstImplementsInterface *iface, |
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| 59 | GType iface_type); |
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| 60 | |
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| 61 | gpointer _gst_reserved[GST_PADDING]; |
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| 62 | }; |
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| 63 | |
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| 64 | #define GST_IMPLEMENTS_INTERFACE_CHECK_INSTANCE_CAST(obj, type, cast_t) \ |
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| 65 | ((cast_t *) gst_implements_interface_cast ((obj), (type))) |
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| 66 | #define GST_IMPLEMENTS_INTERFACE_CHECK_INSTANCE_TYPE(obj, type) \ |
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| 67 | (gst_implements_interface_check ((obj), (type))) |
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| 68 | |
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| 69 | GType gst_implements_interface_get_type (void); |
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| 70 | |
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| 71 | /* wrapper functions to check for functionality implementation */ |
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| 72 | gboolean gst_element_implements_interface (GstElement *element, |
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| 73 | GType iface_type); |
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| 74 | gpointer gst_implements_interface_cast (gpointer from, |
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| 75 | GType type); |
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| 76 | gboolean gst_implements_interface_check (gpointer from, |
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| 77 | GType type); |
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| 78 | |
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| 79 | G_END_DECLS |
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| 80 | |
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| 81 | #endif /* __GST_IMPLEMENTS_INTERFACE_H__ */ |
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