libavcodec/rnd_avg.h

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