rnd_avg.h (1570B)
1 /* 2 * Copyright (c) 2001-2003 BERO <bero@geocities.co.jp> 3 * Copyright (c) 2011 Oskar Arvidsson 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22 #ifndef AVCODEC_RND_AVG_H 23 #define AVCODEC_RND_AVG_H 24 25 #include <stddef.h> 26 #include <stdint.h> 27 28 #define BYTE_VEC32(c) ((c) * 0x01010101UL) 29 #define BYTE_VEC64(c) ((c) * 0x0001000100010001UL) 30 31 static inline uint32_t rnd_avg32(uint32_t a, uint32_t b) 32 { 33 return (a | b) - (((a ^ b) & ~BYTE_VEC32(0x01)) >> 1); 34 } 35 36 static inline uint32_t no_rnd_avg32(uint32_t a, uint32_t b) 37 { 38 return (a & b) + (((a ^ b) & ~BYTE_VEC32(0x01)) >> 1); 39 } 40 41 static inline uint64_t rnd_avg64(uint64_t a, uint64_t b) 42 { 43 return (a | b) - (((a ^ b) & ~BYTE_VEC64(0x01)) >> 1); 44 } 45 46 static inline uint64_t no_rnd_avg64(uint64_t a, uint64_t b) 47 { 48 return (a & b) + (((a ^ b) & ~BYTE_VEC64(0x01)) >> 1); 49 } 50 51 #endif /* AVCODEC_RND_AVG_H */