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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 */ |