mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-24 10:41:04 +00:00
106 lines
3 KiB
C
106 lines
3 KiB
C
/* GStreamer
|
|
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
|
|
* Library <2002> Steve Baker <stevebaker_org@yahoo.co.uk>
|
|
*
|
|
* 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 __FLOATCAST_H__
|
|
#define __FLOATCAST_H__
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#include <string.h>
|
|
#include <glib/gtypes.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
#if (HAVE_LRINT && HAVE_LRINTF)
|
|
|
|
/* These defines enable functionality introduced with the 1999 ISO C
|
|
** standard. They must be defined before the inclusion of math.h to
|
|
** engage them. If optimisation is enabled, these functions will be
|
|
** inlined. With optimisation switched off, you have to link in the
|
|
** maths library using -lm.
|
|
*/
|
|
|
|
#define _ISOC9X_SOURCE 1
|
|
#define _ISOC99_SOURCE 1
|
|
|
|
#define __USE_ISOC9X 1
|
|
#define __USE_ISOC99 1
|
|
|
|
#include <math.h>
|
|
|
|
#define gst_cast_float(x) ((gint)lrintf(x))
|
|
#define gst_cast_double(x) ((gint)lrint(x))
|
|
|
|
#else
|
|
/* use a standard c cast, but do rounding correctly */
|
|
#define gst_cast_float(x) ((x)>=0?(gint)((x)+0.5):(gint)((x)-0.5))
|
|
#define gst_cast_double(x) ((x)>=0?(gint)((x)+0.5):(gint)((x)-0.5))
|
|
|
|
#endif
|
|
|
|
inline static gfloat
|
|
GFLOAT_SWAP_LE_BE(gfloat in)
|
|
{
|
|
gint32 swap;
|
|
gfloat out;
|
|
memcpy(&swap, &in, 4);
|
|
swap = GUINT32_SWAP_LE_BE_CONSTANT (swap);
|
|
memcpy(&out, &swap, 4);
|
|
return out;
|
|
}
|
|
|
|
inline static gdouble
|
|
GDOUBLE_SWAP_LE_BE(gdouble in)
|
|
{
|
|
gint64 swap;
|
|
gdouble out;
|
|
memcpy(&swap, &in, 8);
|
|
swap = GUINT64_SWAP_LE_BE_CONSTANT (swap);
|
|
memcpy(&out, &swap, 8);
|
|
return out;
|
|
}
|
|
|
|
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
|
|
#define GFLOAT_TO_LE(val) ((gfloat) (val))
|
|
#define GFLOAT_TO_BE(val) (GFLOAT_SWAP_LE_BE (val))
|
|
#define GDOUBLE_TO_LE(val) ((gdouble) (val))
|
|
#define GDOUBLE_TO_BE(val) (GDOUBLE_SWAP_LE_BE (val))
|
|
|
|
#elif G_BYTE_ORDER == G_BIG_ENDIAN
|
|
#define GFLOAT_TO_LE(val) (GFLOAT_SWAP_LE_BE (val))
|
|
#define GFLOAT_TO_BE(val) ((gfloat) (val))
|
|
#define GDOUBLE_TO_LE(val) (GDOUBLE_SWAP_LE_BE (val))
|
|
#define GDOUBLE_TO_BE(val) ((gdouble) (val))
|
|
|
|
#else /* !G_LITTLE_ENDIAN && !G_BIG_ENDIAN */
|
|
#error unknown ENDIAN type
|
|
#endif /* !G_LITTLE_ENDIAN && !G_BIG_ENDIAN */
|
|
|
|
#define GFLOAT_FROM_LE(val) (GFLOAT_TO_LE (val))
|
|
#define GFLOAT_FROM_BE(val) (GDOUBLE_TO_BE (val))
|
|
#define GDOUBLE_FROM_LE(val) (GFLOAT_TO_LE (val))
|
|
#define GDOUBLE_FROM_BE(val) (GDOUBLE_TO_BE (val))
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __FLOATCAST_H__ */
|
|
|