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Original commit message from CVS: * gst/gstthread.c: fix docs * gst/gstutils.h: fix GST_BOILERPLATE_FULL to not throw casting errors on C++
109 lines
4.2 KiB
C
109 lines
4.2 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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* gstutils.h: Header for various utility functions
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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_UTILS_H__
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#define __GST_UTILS_H__
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#include <glib.h>
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#include <gst/gstelement.h>
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G_BEGIN_DECLS
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void gst_util_set_value_from_string (GValue *value, const gchar *value_str);
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void gst_util_set_object_arg (GObject *object, const gchar *name, const gchar *value);
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void gst_util_dump_mem (const guchar *mem, guint size);
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void gst_print_pad_caps (GString *buf, gint indent, GstPad *pad);
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void gst_print_element_args (GString *buf, gint indent, GstElement *element);
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/* Macros for defining classes. Ideas taken from Bonobo, which took theirs
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from Nautilus and GOB. */
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/* Define the boilerplate type stuff to reduce typos and code size. Defines
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the get_type method and the parent_class static variable.
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void additional_initializations (GType type) is for initializing interfaces
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and stuff like that */
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#define GST_BOILERPLATE_FULL(type, type_as_function, parent_type, \
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parent_type_macro, additional_initializations) \
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\
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static void type_as_function ## _base_init (gpointer g_class); \
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static void type_as_function ## _class_init (type ## Class *g_class); \
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static void type_as_function ## _init (type *object); \
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static parent_type ## Class *parent_class = NULL; \
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static void \
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type_as_function ## _class_init_trampoline (gpointer g_class, \
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gpointer data) \
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{ \
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parent_class = (parent_type ## Class *) g_type_class_peek_parent (g_class); \
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type_as_function ## _class_init ((type ## Class *)g_class); \
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} \
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\
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GType \
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type_as_function ## _get_type (void) \
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{ \
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static GType object_type = 0; \
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if (object_type == 0) { \
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static const GTypeInfo object_info = { \
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sizeof (type ## Class), \
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type_as_function ## _base_init, \
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NULL, /* base_finalize */ \
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type_as_function ## _class_init_trampoline, \
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NULL, /* class_finalize */ \
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NULL, /* class_data */ \
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sizeof (type), \
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0, /* n_preallocs */ \
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(GInstanceInitFunc) type_as_function ## _init \
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}; \
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object_type = g_type_register_static (parent_type_macro, #type, \
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&object_info, (GTypeFlags) 0); \
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additional_initializations (object_type); \
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} \
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return object_type; \
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}
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#define __GST_DO_NOTHING(type) /* NOP */
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#define GST_BOILERPLATE(type,type_as_function,parent_type,parent_type_macro) \
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GST_BOILERPLATE_FULL (type, type_as_function, parent_type, parent_type_macro, \
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__GST_DO_NOTHING)
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/* Just call the parent handler. This assumes that there is a variable
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* named parent_class that points to the (duh!) parent class. Note that
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* this macro is not to be used with things that return something, use
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* the _WITH_DEFAULT version for that */
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#define GST_CALL_PARENT(parent_class_cast, name, args) \
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((parent_class_cast(parent_class)->name != NULL) ? \
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parent_class_cast(parent_class)->name args : (void) 0)
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/* Same as above, but in case there is no implementation, it evaluates
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* to def_return */
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#define GST_CALL_PARENT_WITH_DEFAULT(parent_class_cast, name, args, def_return) \
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((parent_class_cast(parent_class)->name != NULL) ? \
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parent_class_cast(parent_class)->name args : def_return)
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G_END_DECLS
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#endif /* __GST_UTILS_H__ */
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