mpv/bswap.h

58 lines
1.3 KiB
C

#ifndef __MP_BSWAP_H__
#define __MP_BSWAP_H__
#include "libavutil/common.h"
#include "libavutil/bswap.h"
static inline float bswap_flt(float x) {
union {uint32_t i; float f;} u;
u.f = x;
u.i = bswap_32(u.i);
return u.f;
}
static inline double bswap_dbl(double x) {
union {uint64_t i; double d;} u;
u.d = x;
u.i = bswap_64(u.i);
return u.d;
}
static inline long double bswap_ldbl(long double x) {
union {char d[10]; long double ld;} uin;
union {char d[10]; long double ld;} uout;
uin.ld = x;
uout.d[0] = uin.d[9];
uout.d[1] = uin.d[8];
uout.d[2] = uin.d[7];
uout.d[3] = uin.d[6];
uout.d[4] = uin.d[5];
uout.d[5] = uin.d[4];
uout.d[6] = uin.d[3];
uout.d[7] = uin.d[2];
uout.d[8] = uin.d[1];
uout.d[9] = uin.d[0];
return uout.ld;
}
// be2me ... BigEndian to MachineEndian
// le2me ... LittleEndian to MachineEndian
#ifdef WORDS_BIGENDIAN
#define be2me_flt(x) (x)
#define be2me_dbl(x) (x)
#define be2me_ldbl(x) (x)
#define le2me_flt(x) bswap_flt(x)
#define le2me_dbl(x) bswap_dbl(x)
#define le2me_ldbl(x) bswap_ldbl(x)
#else
#define be2me_flt(x) bswap_flt(x)
#define be2me_dbl(x) bswap_dbl(x)
#define be2me_ldbl(x) bswap_ldbl(x)
#define le2me_flt(x) (x)
#define le2me_dbl(x) (x)
#define le2me_ldbl(x) (x)
#endif
#endif /* __MP_BSWAP_H__ */