blob: 344775e31fda1ea868a0e8963a199bb1d8f8b908
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 */ |
52 |