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libavcodec/mathops.h

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00001 /*
00002  * simple math operations
00003  * Copyright (c) 2001, 2002 Fabrice Bellard
00004  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 #ifndef AVCODEC_MATHOPS_H
00023 #define AVCODEC_MATHOPS_H
00024 
00025 #include "libavutil/common.h"
00026 
00027 #if   ARCH_X86
00028 
00029 #include "x86/mathops.h"
00030 
00031 #elif ARCH_ARM
00032 
00033 #include "arm/mathops.h"
00034 
00035 #elif ARCH_PPC
00036 
00037 #include "ppc/mathops.h"
00038 
00039 #elif ARCH_BFIN
00040 
00041 #include "bfin/mathops.h"
00042 
00043 #endif
00044 
00045 /* generic implementation */
00046 
00047 #ifndef MULL
00048 #   define MULL(a,b,s) (((int64_t)(a) * (int64_t)(b)) >> (s))
00049 #endif
00050 
00051 #ifndef MULH
00052 //gcc 3.4 creates an incredibly bloated mess out of this
00053 //#    define MULH(a,b) (((int64_t)(a) * (int64_t)(b))>>32)
00054 
00055 static av_always_inline int MULH(int a, int b){
00056     return ((int64_t)(a) * (int64_t)(b))>>32;
00057 }
00058 #endif
00059 
00060 #ifndef MUL64
00061 #   define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
00062 #endif
00063 
00064 #ifndef MAC64
00065 #   define MAC64(d, a, b) ((d) += MUL64(a, b))
00066 #endif
00067 
00068 #ifndef MLS64
00069 #   define MLS64(d, a, b) ((d) -= MUL64(a, b))
00070 #endif
00071 
00072 /* signed 16x16 -> 32 multiply add accumulate */
00073 #ifndef MAC16
00074 #   define MAC16(rt, ra, rb) rt += (ra) * (rb)
00075 #endif
00076 
00077 /* signed 16x16 -> 32 multiply */
00078 #ifndef MUL16
00079 #   define MUL16(ra, rb) ((ra) * (rb))
00080 #endif
00081 
00082 #ifndef MLS16
00083 #   define MLS16(rt, ra, rb) ((rt) -= (ra) * (rb))
00084 #endif
00085 
00086 /* median of 3 */
00087 #ifndef mid_pred
00088 #define mid_pred mid_pred
00089 static inline av_const int mid_pred(int a, int b, int c)
00090 {
00091 #if 0
00092     int t= (a-b)&((a-b)>>31);
00093     a-=t;
00094     b+=t;
00095     b-= (b-c)&((b-c)>>31);
00096     b+= (a-b)&((a-b)>>31);
00097 
00098     return b;
00099 #else
00100     if(a>b){
00101         if(c>b){
00102             if(c>a) b=a;
00103             else    b=c;
00104         }
00105     }else{
00106         if(b>c){
00107             if(c>a) b=c;
00108             else    b=a;
00109         }
00110     }
00111     return b;
00112 #endif
00113 }
00114 #endif
00115 
00116 #endif /* AVCODEC_MATHOPS_H */
00117 

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