95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/*
|
|
* copyright (c) 2006 Michael Niedermayer <[email protected]>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file libavutil/bswap.h
|
|
* byte swapping routines
|
|
*/
|
|
|
|
#ifndef AVUTIL_BSWAP_H
|
|
#define AVUTIL_BSWAP_H
|
|
|
|
#ifdef __MW__
|
|
#define inline __inline
|
|
#include <core/types.h>
|
|
#else
|
|
#include <stdint.h>
|
|
#endif
|
|
#include "common.h"
|
|
#include <stdint.h>
|
|
|
|
#ifndef bswap_16
|
|
static av_always_inline av_const uint16_t bswap_16(uint16_t x)
|
|
{
|
|
x = (x >> 8) | (x << 8);
|
|
return x;
|
|
}
|
|
#endif
|
|
|
|
#ifndef bswap_32
|
|
static av_always_inline av_const uint32_t bswap_32(uint32_t x)
|
|
{
|
|
x = ((x << 8) & 0xFF00FF00) | ((x >> 8) & 0x00FF00FF);
|
|
x = (x >> 16) | (x << 16);
|
|
return x;
|
|
}
|
|
#endif
|
|
|
|
#ifndef bswap_64
|
|
static inline uint64_t av_const bswap_64(uint64_t x)
|
|
{
|
|
#if 0
|
|
x = ((x << 8) & 0xFF00FF00FF00FF00ULL) | ((x >> 8) & 0x00FF00FF00FF00FFULL);
|
|
x = ((x << 16) & 0xFFFF0000FFFF0000ULL) | ((x >> 16) & 0x0000FFFF0000FFFFULL);
|
|
return (x >> 32) | (x << 32);
|
|
#else
|
|
union {
|
|
uint64_t ll;
|
|
uint32_t l[2];
|
|
} w, r;
|
|
w.ll = x;
|
|
r.l[0] = bswap_32(w.l[1]);
|
|
r.l[1] = bswap_32(w.l[0]);
|
|
return r.ll;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
// be2me ... big-endian to machine-endian
|
|
// le2me ... little-endian to machine-endian
|
|
|
|
#if HAVE_BIGENDIAN
|
|
#define be2me_16(x) (x)
|
|
#define be2me_32(x) (x)
|
|
#define be2me_64(x) (x)
|
|
#define le2me_16(x) bswap_16(x)
|
|
#define le2me_32(x) bswap_32(x)
|
|
#define le2me_64(x) bswap_64(x)
|
|
#else
|
|
#define be2me_16(x) bswap_16(x)
|
|
#define be2me_32(x) bswap_32(x)
|
|
#define be2me_64(x) bswap_64(x)
|
|
#define le2me_16(x) (x)
|
|
#define le2me_32(x) (x)
|
|
#define le2me_64(x) (x)
|
|
#endif
|
|
|
|
#endif /* AVUTIL_BSWAP_H */
|