nengel@2: /*
nengel@2:  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
nengel@2:  *
nengel@2:  * This file is part of FFmpeg.
nengel@2:  *
nengel@2:  * FFmpeg is free software; you can redistribute it and/or
nengel@2:  * modify it under the terms of the GNU Lesser General Public
nengel@2:  * License as published by the Free Software Foundation; either
nengel@2:  * version 2.1 of the License, or (at your option) any later version.
nengel@2:  *
nengel@2:  * FFmpeg is distributed in the hope that it will be useful,
nengel@2:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nengel@2:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
nengel@2:  * Lesser General Public License for more details.
nengel@2:  *
nengel@2:  * You should have received a copy of the GNU Lesser General Public
nengel@2:  * License along with FFmpeg; if not, write to the Free Software
nengel@2:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
nengel@2:  */
nengel@2: 
nengel@2: /**
nengel@2:  * @file
nengel@2:  * byte swapping routines
nengel@2:  */
nengel@2: 
nengel@2: #ifndef AVUTIL_BSWAP_H
nengel@2: #define AVUTIL_BSWAP_H
nengel@2: 
nengel@2: #include <stdint.h>
nengel@2: #include "config.h"
nengel@2: #include "attributes.h"
nengel@2: 
nengel@2: #if   ARCH_ARM
nengel@2: #   include "arm/bswap.h"
nengel@2: #elif ARCH_X86
nengel@2: #   include "x86/bswap.h"
nengel@2: #endif
nengel@2: 
nengel@2: #ifndef bswap_16
nengel@2: static av_always_inline av_const uint16_t bswap_16(uint16_t x)
nengel@2: {
nengel@2:     x= (x>>8) | (x<<8);
nengel@2:     return x;
nengel@2: }
nengel@2: #endif
nengel@2: 
nengel@2: #ifndef bswap_32
nengel@2: static av_always_inline av_const uint32_t bswap_32(uint32_t x)
nengel@2: {
nengel@2:     x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
nengel@2:     x= (x>>16) | (x<<16);
nengel@2:     return x;
nengel@2: }
nengel@2: #endif
nengel@2: 
nengel@2: #ifndef bswap_64
nengel@2: static inline uint64_t av_const bswap_64(uint64_t x)
nengel@2: {
nengel@2: #if 0
nengel@2:     x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
nengel@2:     x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
nengel@2:     return (x>>32) | (x<<32);
nengel@2: #else
nengel@2:     union {
nengel@2:         uint64_t ll;
nengel@2:         uint32_t l[2];
nengel@2:     } w, r;
nengel@2:     w.ll = x;
nengel@2:     r.l[0] = bswap_32 (w.l[1]);
nengel@2:     r.l[1] = bswap_32 (w.l[0]);
nengel@2:     return r.ll;
nengel@2: #endif
nengel@2: }
nengel@2: #endif
nengel@2: 
nengel@2: // be2me ... big-endian to machine-endian
nengel@2: // le2me ... little-endian to machine-endian
nengel@2: 
nengel@2: #if HAVE_BIGENDIAN
nengel@2: #define be2me_16(x) (x)
nengel@2: #define be2me_32(x) (x)
nengel@2: #define be2me_64(x) (x)
nengel@2: #define le2me_16(x) bswap_16(x)
nengel@2: #define le2me_32(x) bswap_32(x)
nengel@2: #define le2me_64(x) bswap_64(x)
nengel@2: #else
nengel@2: #define be2me_16(x) bswap_16(x)
nengel@2: #define be2me_32(x) bswap_32(x)
nengel@2: #define be2me_64(x) bswap_64(x)
nengel@2: #define le2me_16(x) (x)
nengel@2: #define le2me_32(x) (x)
nengel@2: #define le2me_64(x) (x)
nengel@2: #endif
nengel@2: 
nengel@2: #endif /* AVUTIL_BSWAP_H */