mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
118 lines
3.0 KiB
118 lines
3.0 KiB
/* |
|
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> |
|
* |
|
* 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 |
|
* byte swapping routines |
|
*/ |
|
|
|
#ifndef AVUTIL_BSWAP_H |
|
#define AVUTIL_BSWAP_H |
|
|
|
#include <stdint.h> |
|
#include "config.h" |
|
#include "attributes.h" |
|
|
|
#if ARCH_ARM |
|
# include "arm/bswap.h" |
|
#elif ARCH_AVR32 |
|
# include "avr32/bswap.h" |
|
#elif ARCH_BFIN |
|
# include "bfin/bswap.h" |
|
#elif ARCH_SH4 |
|
# include "sh4/bswap.h" |
|
#elif ARCH_X86 |
|
# include "x86/bswap.h" |
|
#endif |
|
|
|
#define AV_BSWAP16C(x) (((x) << 8 & 0xff00) | ((x) >> 8 & 0x00ff)) |
|
#define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16)) |
|
#define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32)) |
|
|
|
#define AV_BSWAPC(s, x) AV_BSWAP##s##C(x) |
|
|
|
#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) |
|
#define AV_BE2MEC(s, x) (x) |
|
#define AV_LE2MEC(s, x) AV_BSWAPC(s, 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) |
|
#define AV_BE2MEC(s, x) AV_BSWAPC(s, x) |
|
#define AV_LE2MEC(s, x) (x) |
|
#endif |
|
|
|
#define AV_BE2ME16C(x) AV_BE2MEC(16, x) |
|
#define AV_BE2ME32C(x) AV_BE2MEC(32, x) |
|
#define AV_BE2ME64C(x) AV_BE2MEC(64, x) |
|
#define AV_LE2ME16C(x) AV_LE2MEC(16, x) |
|
#define AV_LE2ME32C(x) AV_LE2MEC(32, x) |
|
#define AV_LE2ME64C(x) AV_LE2MEC(64, x) |
|
|
|
#endif /* AVUTIL_BSWAP_H */
|
|
|