/* GStreamer * Copyright (C) <1999> Erik Walthinsen * Library <2002> Steve Baker * * 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. */ /** * SECTION:gstfloatcast * @short_description: Floating point platform independence macros */ #ifndef __FLOATCAST_H__ #define __FLOATCAST_H__ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include /* to make sure inline is defined properly */ #if defined (_MSC_VER) && !defined (inline) #define inline __inline #endif 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 #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) ((gint)floor((x)+0.5)) #define gst_cast_double(x) ((gint)floor((x)+0.5)) #endif inline static gfloat GFLOAT_SWAP_LE_BE(gfloat in) { union { guint32 i; gfloat f; } u; u.f = in; u.i = GUINT32_SWAP_LE_BE (u.i); return u.f; } inline static gdouble GDOUBLE_SWAP_LE_BE(gdouble in) { union { guint64 i; gdouble d; } u; u.d = in; u.i = GUINT64_SWAP_LE_BE (u.i); return u.d; } #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) (GFLOAT_TO_BE (val)) #define GDOUBLE_FROM_LE(val) (GDOUBLE_TO_LE (val)) #define GDOUBLE_FROM_BE(val) (GDOUBLE_TO_BE (val)) G_END_DECLS #endif /* __FLOATCAST_H__ */