2011-08-16 20:27:15 +08:00
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/*
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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
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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 "libavutil/avconfig.h"
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#include "attributes.h"
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#ifdef HAVE_AV_CONFIG_H
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#include "config.h"
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#if ARCH_ARM
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# include "arm/bswap.h"
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#elif ARCH_AVR32
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# include "avr32/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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#endif /* HAVE_AV_CONFIG_H */
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#define AV_BSWAP16C(x) (((x) << 8 & 0xff00) | ((x) >> 8 & 0x00ff))
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#define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16))
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#define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32))
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#define AV_BSWAPC(s, x) AV_BSWAP##s##C(x)
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#ifndef av_bswap16
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static av_always_inline av_const uint16_t av_bswap16(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 av_bswap32
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static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
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{
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2012-04-10 01:21:54 +08:00
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return AV_BSWAP32C(x);
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2011-08-16 20:27:15 +08:00
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}
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#endif
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#ifndef av_bswap64
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static inline uint64_t av_const av_bswap64(uint64_t x)
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{
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2012-04-10 01:21:54 +08:00
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return (uint64_t)av_bswap32(x) << 32 | av_bswap32(x >> 32);
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2011-08-16 20:27:15 +08:00
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}
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#endif
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// be2ne ... big-endian to native-endian
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// le2ne ... little-endian to native-endian
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#if AV_HAVE_BIGENDIAN
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#define av_be2ne16(x) (x)
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#define av_be2ne32(x) (x)
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#define av_be2ne64(x) (x)
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#define av_le2ne16(x) av_bswap16(x)
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#define av_le2ne32(x) av_bswap32(x)
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#define av_le2ne64(x) av_bswap64(x)
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#define AV_BE2NEC(s, x) (x)
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#define AV_LE2NEC(s, x) AV_BSWAPC(s, x)
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#else
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#define av_be2ne16(x) av_bswap16(x)
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#define av_be2ne32(x) av_bswap32(x)
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#define av_be2ne64(x) av_bswap64(x)
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#define av_le2ne16(x) (x)
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#define av_le2ne32(x) (x)
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#define av_le2ne64(x) (x)
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#define AV_BE2NEC(s, x) AV_BSWAPC(s, x)
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#define AV_LE2NEC(s, x) (x)
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#endif
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#define AV_BE2NE16C(x) AV_BE2NEC(16, x)
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#define AV_BE2NE32C(x) AV_BE2NEC(32, x)
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#define AV_BE2NE64C(x) AV_BE2NEC(64, x)
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#define AV_LE2NE16C(x) AV_LE2NEC(16, x)
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#define AV_LE2NE32C(x) AV_LE2NEC(32, x)
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#define AV_LE2NE64C(x) AV_LE2NEC(64, x)
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#endif /* AVUTIL_BSWAP_H */
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