libavcodec/dcamath.h

   1 /*
   2  * Copyright (C) 2016 foo86
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef AVCODEC_DCAMATH_H
  22 #define AVCODEC_DCAMATH_H
  23
  24 #include "libavutil/common.h"
  25 #include "libavutil/intmath.h"
  26
  27 static inline int32_t norm__(int64_t a, int bits)
  28 {
  29     if (bits > 0)
  30         return (int32_t)((a + (INT64_C(1) << (bits - 1))) >> bits);
  31     else
  32         return (int32_t)a;
  33 }
  34
  35 static inline int32_t mul__(int32_t a, int32_t b, int bits)
  36 {
  37     return norm__((int64_t)a * b, bits);
  38 }
  39
  40 static inline int32_t norm13(int64_t a) { return norm__(a, 13); }
  41 static inline int32_t norm16(int64_t a) { return norm__(a, 16); }
  42 static inline int32_t norm20(int64_t a) { return norm__(a, 20); }
  43 static inline int32_t norm21(int64_t a) { return norm__(a, 21); }
  44 static inline int32_t norm23(int64_t a) { return norm__(a, 23); }
  45
  46 static inline int32_t mul15(int32_t a, int32_t b) { return mul__(a, b, 15); }
  47 static inline int32_t mul16(int32_t a, int32_t b) { return mul__(a, b, 16); }
  48 static inline int32_t mul17(int32_t a, int32_t b) { return mul__(a, b, 17); }
  49 static inline int32_t mul22(int32_t a, int32_t b) { return mul__(a, b, 22); }
  50 static inline int32_t mul23(int32_t a, int32_t b) { return mul__(a, b, 23); }
  51 static inline int32_t mul31(int32_t a, int32_t b) { return mul__(a, b, 31); }
  52 static inline int32_t mul32(int32_t a, int32_t b) { return mul__(a, b, 32); }
  53
  54 static inline int32_t clip23(int32_t a) { return av_clip_intp2(a, 23); }
  55
  56 #endif