1/* 2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> 3 * 4 * This file is part of Libav. 5 * 6 * Libav 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 * Libav 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 Libav; 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 "libavutil/avconfig.h" 31#include "attributes.h" 32 33#ifdef HAVE_AV_CONFIG_H 34 35#include "config.h" 36 37#if ARCH_ARM 38# include "arm/bswap.h" 39#elif ARCH_AVR32 40# include "avr32/bswap.h" 41#elif ARCH_BFIN 42# include "bfin/bswap.h" 43#elif ARCH_SH4 44# include "sh4/bswap.h" 45#elif ARCH_X86 46# include "x86/bswap.h" 47#endif 48 49#endif /* HAVE_AV_CONFIG_H */ 50 51#define AV_BSWAP16C(x) (((x) << 8 & 0xff00) | ((x) >> 8 & 0x00ff)) 52#define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16)) 53#define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32)) 54 55#define AV_BSWAPC(s, x) AV_BSWAP##s##C(x) 56 57#ifndef av_bswap16 58static av_always_inline av_const uint16_t av_bswap16(uint16_t x) 59{ 60 x= (x>>8) | (x<<8); 61 return x; 62} 63#endif 64 65#ifndef av_bswap32 66static av_always_inline av_const uint32_t av_bswap32(uint32_t x) 67{ 68 return AV_BSWAP32C(x); 69} 70#endif 71 72#ifndef av_bswap64 73static inline uint64_t av_const av_bswap64(uint64_t x) 74{ 75 return (uint64_t)av_bswap32(x) << 32 | av_bswap32(x >> 32); 76} 77#endif 78 79// be2ne ... big-endian to native-endian 80// le2ne ... little-endian to native-endian 81 82#if AV_HAVE_BIGENDIAN 83#define av_be2ne16(x) (x) 84#define av_be2ne32(x) (x) 85#define av_be2ne64(x) (x) 86#define av_le2ne16(x) av_bswap16(x) 87#define av_le2ne32(x) av_bswap32(x) 88#define av_le2ne64(x) av_bswap64(x) 89#define AV_BE2NEC(s, x) (x) 90#define AV_LE2NEC(s, x) AV_BSWAPC(s, x) 91#else 92#define av_be2ne16(x) av_bswap16(x) 93#define av_be2ne32(x) av_bswap32(x) 94#define av_be2ne64(x) av_bswap64(x) 95#define av_le2ne16(x) (x) 96#define av_le2ne32(x) (x) 97#define av_le2ne64(x) (x) 98#define AV_BE2NEC(s, x) AV_BSWAPC(s, x) 99#define AV_LE2NEC(s, x) (x) 100#endif 101 102#define AV_BE2NE16C(x) AV_BE2NEC(16, x) 103#define AV_BE2NE32C(x) AV_BE2NEC(32, x) 104#define AV_BE2NE64C(x) AV_BE2NEC(64, x) 105#define AV_LE2NE16C(x) AV_LE2NEC(16, x) 106#define AV_LE2NE32C(x) AV_LE2NEC(32, x) 107#define AV_LE2NE64C(x) AV_LE2NEC(64, x) 108 109#endif /* AVUTIL_BSWAP_H */ 110