bswap.h (2848B)
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 58 static 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 66 static 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 73 static 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 */