blob: 36140571cd650ec077413b027fbf0404745cc383
| 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 libavutil/bswap.h |
| 23 | * byte swapping routines |
| 24 | */ |
| 25 | |
| 26 | #ifndef AVUTIL_BSWAP_H |
| 27 | #define AVUTIL_BSWAP_H |
| 28 | |
| 29 | #ifdef __MW__ |
| 30 | #define inline __inline |
| 31 | #include <core/types.h> |
| 32 | #else |
| 33 | #include <stdint.h> |
| 34 | #endif |
| 35 | #include "common.h" |
| 36 | #include <stdint.h> |
| 37 | |
| 38 | #ifndef bswap_16 |
| 39 | static av_always_inline av_const uint16_t bswap_16(uint16_t x) |
| 40 | { |
| 41 | x = (x >> 8) | (x << 8); |
| 42 | return x; |
| 43 | } |
| 44 | #endif |
| 45 | |
| 46 | #ifndef bswap_32 |
| 47 | static av_always_inline av_const uint32_t bswap_32(uint32_t x) |
| 48 | { |
| 49 | x = ((x << 8) & 0xFF00FF00) | ((x >> 8) & 0x00FF00FF); |
| 50 | x = (x >> 16) | (x << 16); |
| 51 | return x; |
| 52 | } |
| 53 | #endif |
| 54 | |
| 55 | #ifndef bswap_64 |
| 56 | static inline uint64_t av_const bswap_64(uint64_t x) |
| 57 | { |
| 58 | #if 0 |
| 59 | x = ((x << 8) & 0xFF00FF00FF00FF00ULL) | ((x >> 8) & 0x00FF00FF00FF00FFULL); |
| 60 | x = ((x << 16) & 0xFFFF0000FFFF0000ULL) | ((x >> 16) & 0x0000FFFF0000FFFFULL); |
| 61 | return (x >> 32) | (x << 32); |
| 62 | #else |
| 63 | union { |
| 64 | uint64_t ll; |
| 65 | uint32_t l[2]; |
| 66 | } w, r; |
| 67 | w.ll = x; |
| 68 | r.l[0] = bswap_32(w.l[1]); |
| 69 | r.l[1] = bswap_32(w.l[0]); |
| 70 | return r.ll; |
| 71 | #endif |
| 72 | } |
| 73 | #endif |
| 74 | |
| 75 | // be2me ... big-endian to machine-endian |
| 76 | // le2me ... little-endian to machine-endian |
| 77 | |
| 78 | #if HAVE_BIGENDIAN |
| 79 | #define be2me_16(x) (x) |
| 80 | #define be2me_32(x) (x) |
| 81 | #define be2me_64(x) (x) |
| 82 | #define le2me_16(x) bswap_16(x) |
| 83 | #define le2me_32(x) bswap_32(x) |
| 84 | #define le2me_64(x) bswap_64(x) |
| 85 | #else |
| 86 | #define be2me_16(x) bswap_16(x) |
| 87 | #define be2me_32(x) bswap_32(x) |
| 88 | #define be2me_64(x) bswap_64(x) |
| 89 | #define le2me_16(x) (x) |
| 90 | #define le2me_32(x) (x) |
| 91 | #define le2me_64(x) (x) |
| 92 | #endif |
| 93 | |
| 94 | #endif /* AVUTIL_BSWAP_H */ |
| 95 |