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+ adding endianness conversion macros for floats

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Original commit message from CVS:
+ adding endianness conversion macros for floats
This commit is contained in:
Leif Johnson 2003-11-16 21:47:16 +00:00
parent f3b328da39
commit 96298704f0
1 changed files with 55 additions and 1 deletions
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56
gst-libs/gst/floatcast/floatcast.h
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@ -21,6 +21,15 @@
#ifndef __FLOATCAST_H__ #ifndef __FLOATCAST_H__
#define __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) #if (HAVE_LRINT && HAVE_LRINTF)
/* These defines enable functionality introduced with the 1999 ISO C /* These defines enable functionality introduced with the 1999 ISO C
@ -40,7 +49,7 @@
#define gst_cast_float(x) ((gint)lrintf(x)) #define gst_cast_float(x) ((gint)lrintf(x))
#define gst_cast_double(x) ((gint)lrint(x)) #define gst_cast_double(x) ((gint)lrint(x))
#else #else
/* use a standard c cast, but do rounding correctly */ /* 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_float(x) ((x)>=0?(gint)((x)+0.5):(gint)((x)-0.5))
@ -48,5 +57,50 @@
#endif #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__ */ #endif /* __FLOATCAST_H__ */