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