100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
/*
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file libavutil/bswap.h
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* byte swapping routines
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*/
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#ifndef AVUTIL_BSWAP_H
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#define AVUTIL_BSWAP_H
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#include <stdint.h>
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#include "config.h"
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#include "common.h"
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#if ARCH_ARM
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# include "arm/bswap.h"
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#elif ARCH_BFIN
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# include "bfin/bswap.h"
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#elif ARCH_SH4
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# include "sh4/bswap.h"
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#elif ARCH_X86
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# include "x86/bswap.h"
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#endif
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#ifndef bswap_16
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static av_always_inline av_const uint16_t bswap_16(uint16_t x)
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{
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x= (x>>8) | (x<<8);
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return x;
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}
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#endif
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#ifndef bswap_32
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static av_always_inline av_const uint32_t bswap_32(uint32_t x)
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{
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x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
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x= (x>>16) | (x<<16);
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return x;
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}
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#endif
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#ifndef bswap_64
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static inline uint64_t av_const bswap_64(uint64_t x)
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{
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#if 0
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x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
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x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
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return (x>>32) | (x<<32);
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#else
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union {
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uint64_t ll;
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uint32_t l[2];
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} w, r;
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w.ll = x;
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r.l[0] = bswap_32 (w.l[1]);
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r.l[1] = bswap_32 (w.l[0]);
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return r.ll;
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#endif
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}
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#endif
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// be2me ... big-endian to machine-endian
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// le2me ... little-endian to machine-endian
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#if HAVE_BIGENDIAN
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#define be2me_16(x) (x)
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#define be2me_32(x) (x)
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#define be2me_64(x) (x)
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#define le2me_16(x) bswap_16(x)
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#define le2me_32(x) bswap_32(x)
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#define le2me_64(x) bswap_64(x)
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#else
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#define be2me_16(x) bswap_16(x)
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#define be2me_32(x) bswap_32(x)
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#define be2me_64(x) bswap_64(x)
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#define le2me_16(x) (x)
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#define le2me_32(x) (x)
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#define le2me_64(x) (x)
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#endif
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#endif /* AVUTIL_BSWAP_H */
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