ffmpeg/libavcodec/rnd_avg.h

   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 */