libavcodec/mathops.h

   1 /*
   2  * simple math operations
   3  * Copyright (c) 2001, 2002 Fabrice Bellard
   4  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22 #ifndef AVCODEC_MATHOPS_H
  23 #define AVCODEC_MATHOPS_H
  24
  25 #include "libavutil/common.h"
  26
  27 #if   ARCH_ARM
  28 #   include "arm/mathops.h"
  29 #elif ARCH_AVR32
  30 #   include "avr32/mathops.h"
  31 #elif ARCH_BFIN
  32 #   include "bfin/mathops.h"
  33 #elif ARCH_MIPS
  34 #   include "mips/mathops.h"
  35 #elif ARCH_PPC
  36 #   include "ppc/mathops.h"
  37 #elif ARCH_X86
  38 #   include "x86/mathops.h"
  39 #endif
  40
  41 /* generic implementation */
  42
  43 #ifndef MULL
  44 #   define MULL(a,b,s) (((int64_t)(a) * (int64_t)(b)) >> (s))
  45 #endif
  46
  47 #ifndef MULH
  48 //gcc 3.4 creates an incredibly bloated mess out of this
  49 //#    define MULH(a,b) (((int64_t)(a) * (int64_t)(b))>>32)
  50
  51 static av_always_inline int MULH(int a, int b){
  52     return ((int64_t)(a) * (int64_t)(b))>>32;
  53 }
  54 #endif
  55
  56 #ifndef MUL64
  57 #   define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
  58 #endif
  59
  60 #ifndef MAC64
  61 #   define MAC64(d, a, b) ((d) += MUL64(a, b))
  62 #endif
  63
  64 #ifndef MLS64
  65 #   define MLS64(d, a, b) ((d) -= MUL64(a, b))
  66 #endif
  67
  68 /* signed 16x16 -> 32 multiply add accumulate */
  69 #ifndef MAC16
  70 #   define MAC16(rt, ra, rb) rt += (ra) * (rb)
  71 #endif
  72
  73 /* signed 16x16 -> 32 multiply */
  74 #ifndef MUL16
  75 #   define MUL16(ra, rb) ((ra) * (rb))
  76 #endif
  77
  78 #ifndef MLS16
  79 #   define MLS16(rt, ra, rb) ((rt) -= (ra) * (rb))
  80 #endif
  81
  82 /* median of 3 */
  83 #ifndef mid_pred
  84 #define mid_pred mid_pred
  85 static inline av_const int mid_pred(int a, int b, int c)
  86 {
  87 #if 0
  88     int t= (a-b)&((a-b)>>31);
  89     a-=t;
  90     b+=t;
  91     b-= (b-c)&((b-c)>>31);
  92     b+= (a-b)&((a-b)>>31);
  93
  94     return b;
  95 #else
  96     if(a>b){
  97         if(c>b){
  98             if(c>a) b=a;
  99             else    b=c;
 100         }
 101     }else{
 102         if(b>c){
 103             if(c>a) b=c;
 104             else    b=a;
 105         }
 106     }
 107     return b;
 108 #endif
 109 }
 110 #endif
 111
 112 #ifndef sign_extend
 113 static inline av_const int sign_extend(int val, unsigned bits)
 114 {
 115     return (val << (INT_BIT - bits)) >> (INT_BIT - bits);
 116 }
 117 #endif
 118
 119 #endif /* AVCODEC_MATHOPS_H */
 120