1/* 2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21/** 22 * @file 23 * byte swapping routines 24 */ 25 26#ifndef AVUTIL_BSWAP_H 27#define AVUTIL_BSWAP_H 28 29#include <stdint.h> 30#include "config.h" 31#include "attributes.h" 32 33#if ARCH_ARM 34# include "arm/bswap.h" 35#elif ARCH_AVR32 36# include "avr32/bswap.h" 37#elif ARCH_BFIN 38# include "bfin/bswap.h" 39#elif ARCH_SH4 40# include "sh4/bswap.h" 41#elif ARCH_X86 42# include "x86/bswap.h" 43#endif 44 45#define AV_BSWAP16C(x) (((x) << 8 & 0xff00) | ((x) >> 8 & 0x00ff)) 46#define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16)) 47#define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32)) 48 49#define AV_BSWAPC(s, x) AV_BSWAP##s##C(x) 50 51#ifndef bswap_16 52static av_always_inline av_const uint16_t bswap_16(uint16_t x) 53{ 54 x= (x>>8) | (x<<8); 55 return x; 56} 57#endif 58 59#ifndef bswap_32 60static av_always_inline av_const uint32_t bswap_32(uint32_t x) 61{ 62 x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF); 63 x= (x>>16) | (x<<16); 64 return x; 65} 66#endif 67 68#ifndef bswap_64 69static inline uint64_t av_const bswap_64(uint64_t x) 70{ 71#if 0 72 x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL); 73 x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL); 74 return (x>>32) | (x<<32); 75#else 76 union { 77 uint64_t ll; 78 uint32_t l[2]; 79 } w, r; 80 w.ll = x; 81 r.l[0] = bswap_32 (w.l[1]); 82 r.l[1] = bswap_32 (w.l[0]); 83 return r.ll; 84#endif 85} 86#endif 87 88// be2me ... big-endian to machine-endian 89// le2me ... little-endian to machine-endian 90 91#if HAVE_BIGENDIAN 92#define be2me_16(x) (x) 93#define be2me_32(x) (x) 94#define be2me_64(x) (x) 95#define le2me_16(x) bswap_16(x) 96#define le2me_32(x) bswap_32(x) 97#define le2me_64(x) bswap_64(x) 98#define AV_BE2MEC(s, x) (x) 99#define AV_LE2MEC(s, x) AV_BSWAPC(s, x) 100#else 101#define be2me_16(x) bswap_16(x) 102#define be2me_32(x) bswap_32(x) 103#define be2me_64(x) bswap_64(x) 104#define le2me_16(x) (x) 105#define le2me_32(x) (x) 106#define le2me_64(x) (x) 107#define AV_BE2MEC(s, x) AV_BSWAPC(s, x) 108#define AV_LE2MEC(s, x) (x) 109#endif 110 111#define AV_BE2ME16C(x) AV_BE2MEC(16, x) 112#define AV_BE2ME32C(x) AV_BE2MEC(32, x) 113#define AV_BE2ME64C(x) AV_BE2MEC(64, x) 114#define AV_LE2ME16C(x) AV_LE2MEC(16, x) 115#define AV_LE2ME32C(x) AV_LE2MEC(32, x) 116#define AV_LE2ME64C(x) AV_LE2MEC(64, x) 117 118#endif /* AVUTIL_BSWAP_H */ 119