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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 */
  52.