bswap.h (2766B)
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 "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_RISCV 40 # include "riscv/bswap.h" 41 #elif ARCH_X86 42 # include "x86/bswap.h" 43 #endif 44 45 #endif /* HAVE_AV_CONFIG_H */ 46 47 #define AV_BSWAP16C(x) (((x) << 8 & 0xff00) | ((x) >> 8 & 0x00ff)) 48 #define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16)) 49 #define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32)) 50 51 #define AV_BSWAPC(s, x) AV_BSWAP##s##C(x) 52 53 #ifndef av_bswap16 54 static av_always_inline av_const uint16_t av_bswap16(uint16_t x) 55 { 56 x= (x>>8) | (x<<8); 57 return x; 58 } 59 #endif 60 61 #ifndef av_bswap32 62 static av_always_inline av_const uint32_t av_bswap32(uint32_t x) 63 { 64 return AV_BSWAP32C(x); 65 } 66 #endif 67 68 #ifndef av_bswap64 69 static inline uint64_t av_const av_bswap64(uint64_t x) 70 { 71 return (uint64_t)av_bswap32(x) << 32 | av_bswap32(x >> 32); 72 } 73 #endif 74 75 // be2ne ... big-endian to native-endian 76 // le2ne ... little-endian to native-endian 77 78 #if AV_HAVE_BIGENDIAN 79 #define av_be2ne16(x) (x) 80 #define av_be2ne32(x) (x) 81 #define av_be2ne64(x) (x) 82 #define av_le2ne16(x) av_bswap16(x) 83 #define av_le2ne32(x) av_bswap32(x) 84 #define av_le2ne64(x) av_bswap64(x) 85 #define AV_BE2NEC(s, x) (x) 86 #define AV_LE2NEC(s, x) AV_BSWAPC(s, x) 87 #else 88 #define av_be2ne16(x) av_bswap16(x) 89 #define av_be2ne32(x) av_bswap32(x) 90 #define av_be2ne64(x) av_bswap64(x) 91 #define av_le2ne16(x) (x) 92 #define av_le2ne32(x) (x) 93 #define av_le2ne64(x) (x) 94 #define AV_BE2NEC(s, x) AV_BSWAPC(s, x) 95 #define AV_LE2NEC(s, x) (x) 96 #endif 97 98 #define AV_BE2NE16C(x) AV_BE2NEC(16, x) 99 #define AV_BE2NE32C(x) AV_BE2NEC(32, x) 100 #define AV_BE2NE64C(x) AV_BE2NEC(64, x) 101 #define AV_LE2NE16C(x) AV_LE2NEC(16, x) 102 #define AV_LE2NE32C(x) AV_LE2NEC(32, x) 103 #define AV_LE2NE64C(x) AV_LE2NEC(64, x) 104 105 #endif /* AVUTIL_BSWAP_H */