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99 lines
2.4 KiB
99 lines
2.4 KiB
/* |
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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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#ifdef WORDS_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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