gstreamer/gst/gstutils.h
David Schleef d10158fcb5 configure.ac: Add test for allowing unaligned access. Add define to put in gstconfig.h.
Original commit message from CVS:
* configure.ac: Add test for allowing unaligned access.  Add define
to put in gstconfig.h.
* docs/gst/gstreamer-sections.txt: New symbols
* docs/gst/tmpl/gstcompat.sgml: Check in changes made by gtkdoc
* docs/gst/tmpl/gstfilesrc.sgml:
* docs/gst/tmpl/gstparse.sgml:
* docs/gst/tmpl/gsttypes.sgml:
* docs/gst/tmpl/gstutils.sgml:
* docs/gst/tmpl/gstvalue.sgml:
* gst/gstconfig.h.in: Add GST_HAVE_UNALIGNED_ACCESS
* gst/gstutils.h: Add macros for unaligned memory access.  Useful
on most !i386/!powerpc architectures.  From Daniel Gazard
<daniel.gazard@free.fr>.  (bug #140156)
* po/af.po: Check in changes made by gettext.
* po/az.po:
* po/fr.po:
* po/nl.po:
* po/sr.po:
* po/sv.po:
2004-04-20 00:17:26 +00:00

229 lines
8.6 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstutils.h: Header for various utility functions
*
* 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_UTILS_H__
#define __GST_UTILS_H__
#include <glib.h>
#include <gst/gstelement.h>
G_BEGIN_DECLS
void gst_util_set_value_from_string (GValue *value, const gchar *value_str);
void gst_util_set_object_arg (GObject *object, const gchar *name, const gchar *value);
void gst_util_dump_mem (const guchar *mem, guint size);
void gst_print_pad_caps (GString *buf, gint indent, GstPad *pad);
void gst_print_element_args (GString *buf, gint indent, GstElement *element);
/* Macros for defining classes. Ideas taken from Bonobo, which took theirs
from Nautilus and GOB. */
/* Define the boilerplate type stuff to reduce typos and code size. Defines
the get_type method and the parent_class static variable.
void additional_initializations (GType type) is for initializing interfaces
and stuff like that */
#define GST_BOILERPLATE_FULL(type, type_as_function, parent_type, parent_type_macro, additional_initializations) \
\
static void type_as_function ## _base_init (gpointer g_class); \
static void type_as_function ## _class_init (type ## Class *g_class); \
static void type_as_function ## _init (type *object); \
static parent_type ## Class *parent_class = NULL; \
static void \
type_as_function ## _class_init_trampoline (gpointer g_class, \
gpointer data) \
{ \
parent_class = (parent_type ## Class *) g_type_class_peek_parent (g_class); \
type_as_function ## _class_init ((type ## Class *)g_class); \
} \
\
GType \
type_as_function ## _get_type (void) \
{ \
static GType object_type = 0; \
if (object_type == 0) { \
static const GTypeInfo object_info = { \
sizeof (type ## Class), \
type_as_function ## _base_init, \
NULL, /* base_finalize */ \
type_as_function ## _class_init_trampoline, \
NULL, /* class_finalize */ \
NULL, /* class_data */ \
sizeof (type), \
0, /* n_preallocs */ \
(GInstanceInitFunc) type_as_function ## _init \
}; \
object_type = g_type_register_static (parent_type_macro, #type, \
&object_info, (GTypeFlags) 0); \
additional_initializations (object_type); \
} \
return object_type; \
}
#define __GST_DO_NOTHING(type) /* NOP */
#define GST_BOILERPLATE(type,type_as_function,parent_type,parent_type_macro) \
GST_BOILERPLATE_FULL (type, type_as_function, parent_type, parent_type_macro, \
__GST_DO_NOTHING)
/* Just call the parent handler. This assumes that there is a variable
* named parent_class that points to the (duh!) parent class. Note that
* this macro is not to be used with things that return something, use
* the _WITH_DEFAULT version for that */
#define GST_CALL_PARENT(parent_class_cast, name, args) \
((parent_class_cast(parent_class)->name != NULL) ? \
parent_class_cast(parent_class)->name args : (void) 0)
/* Same as above, but in case there is no implementation, it evaluates
* to def_return */
#define GST_CALL_PARENT_WITH_DEFAULT(parent_class_cast, name, args, def_return) \
((parent_class_cast(parent_class)->name != NULL) ? \
parent_class_cast(parent_class)->name args : def_return)
/* Define possibly unaligned memory access method whether the type of
* architecture. */
#if GST_HAVE_UNALIGNED_ACCESS
#define _GST_GET(__data, __size, __end) \
(GUINT##__size##_FROM_##__end (* ((guint##__size *) (__data))))
#define GST_READ_UINT64_BE(data) _GST_GET (data, 64, BE)
#define GST_READ_UINT64_LE(data) _GST_GET (data, 64, LE)
#define GST_READ_UINT32_BE(data) _GST_GET (data, 32, BE)
#define GST_READ_UINT32_LE(data) _GST_GET (data, 32, LE)
#define GST_READ_UINT16_BE(data) _GST_GET (data, 16, BE)
#define GST_READ_UINT16_LE(data) _GST_GET (data, 16, LE)
#define GST_READ_UINT8(data) (* ((guint8 *) (data)))
#define _GST_PUT(__data, __size, __end, __num) \
((* (guint##__size *) (__data)) = GUINT##__size##_TO_##__end (__num))
#define GST_WRITE_UINT64_BE(data, num) _GST_PUT(data, 64, BE, num)
#define GST_WRITE_UINT64_LE(data, num) _GST_PUT(data, 64, LE, num)
#define GST_WRITE_UINT32_BE(data, num) _GST_PUT(data, 32, BE, num)
#define GST_WRITE_UINT32_LE(data, num) _GST_PUT(data, 32, LE, num)
#define GST_WRITE_UINT16_BE(data, num) _GST_PUT(data, 16, BE, num)
#define GST_WRITE_UINT16_LE(data, num) _GST_PUT(data, 16, LE, num)
#define GST_WRITE_UINT8(data, num) ((* (guint8 *) (data)) = (num))
#else /* GST_HAVE_UNALIGNED_ACCESS */
#define _GST_GET(__data, __idx, __size, __shift) \
(((guint##__size) (((guint8 *) (__data))[__idx])) << __shift)
#define GST_READ_UINT64_BE(data) (_GST_GET (data, 0, 64, 56) | \
_GST_GET (data, 1, 64, 48) | \
_GST_GET (data, 2, 64, 40) | \
_GST_GET (data, 3, 64, 32) | \
_GST_GET (data, 4, 64, 24) | \
_GST_GET (data, 5, 64, 16) | \
_GST_GET (data, 6, 64, 8) | \
_GST_GET (data, 7, 64, 0))
#define GST_READ_UINT64_LE(data) (_GST_GET (data, 7, 64, 56) | \
_GST_GET (data, 6, 64, 48) | \
_GST_GET (data, 5, 64, 40) | \
_GST_GET (data, 4, 64, 32) | \
_GST_GET (data, 3, 64, 24) | \
_GST_GET (data, 2, 64, 16) | \
_GST_GET (data, 1, 64, 8) | \
_GST_GET (data, 0, 64, 0))
#define GST_READ_UINT32_BE(data) (_GST_GET (data, 0, 32, 24) | \
_GST_GET (data, 1, 32, 16) | \
_GST_GET (data, 2, 32, 8) | \
_GST_GET (data, 3, 32, 0))
#define GST_READ_UINT32_LE(data) (_GST_GET (data, 3, 32, 24) | \
_GST_GET (data, 2, 32, 16) | \
_GST_GET (data, 1, 32, 8) | \
_GST_GET (data, 0, 32, 0))
#define GST_READ_UINT16_BE(data) (_GST_GET (data, 0, 16, 8) | \
_GST_GET (data, 1, 16, 0))
#define GST_READ_UINT16_LE(data) (_GST_GET (data, 1, 16, 8) | \
_GST_GET (data, 0, 16, 0))
#define GST_READ_UINT8(data) (_GST_GET (data, 0, 8, 0))
#define _GST_PUT(__data, __idx, __size, __shift, __num) \
(((guint8 *) (__data))[__idx] = (((guint##size) __num) >> __shift) & 0xff)
#define GST_WRITE_UINT64_BE(data, num) do { \
_GST_PUT (data, 0, 64, 56, num); \
_GST_PUT (data, 1, 64, 48, num); \
_GST_PUT (data, 2, 64, 40, num); \
_GST_PUT (data, 3, 64, 32, num); \
_GST_PUT (data, 4, 64, 24, num); \
_GST_PUT (data, 5, 64, 16, num); \
_GST_PUT (data, 6, 64, 8, num); \
_GST_PUT (data, 7, 64, 0, num); \
} while (0)
#define GST_WRITE_UINT64_LE(data, num) do { \
_GST_PUT (data, 0, 64, 0, num); \
_GST_PUT (data, 1, 64, 8, num); \
_GST_PUT (data, 2, 64, 16, num); \
_GST_PUT (data, 3, 64, 24, num); \
_GST_PUT (data, 4, 64, 32, num); \
_GST_PUT (data, 5, 64, 40, num); \
_GST_PUT (data, 6, 64, 48, num); \
_GST_PUT (data, 7, 64, 56, num); \
} while (0)
#define GST_WRITE_UINT32_BE(data, num) do { \
_GST_PUT (data, 0, 32, 24, num); \
_GST_PUT (data, 1, 32, 16, num); \
_GST_PUT (data, 2, 32, 8, num); \
_GST_PUT (data, 3, 32, 0, num); \
} while (0)
#define GST_WRITE_UINT32_LE(data, num) do { \
_GST_PUT (data, 0, 32, 0, num); \
_GST_PUT (data, 1, 32, 8, num); \
_GST_PUT (data, 2, 32, 16, num); \
_GST_PUT (data, 3, 32, 24, num); \
} while (0)
#define GST_WRITE_UINT16_BE(data, num) do { \
_GST_PUT (data, 0, 16, 8, num); \
_GST_PUT (data, 1, 16, 0, num); \
} while (0)
#define GST_WRITE_UINT16_LE(data, num) do { \
_GST_PUT (data, 0, 16, 0, num); \
_GST_PUT (data, 1, 16, 8, num); \
} while (0)
#define GST_WRITE_UINT8(data, num) do { \
_GST_PUT (data, 0, 8, 0, num); \
} while (0)
#endif /* GST_HAVE_UNALIGNED_ACCESS */
G_END_DECLS
#endif /* __GST_UTILS_H__ */