/* * simple math operations * Copyright (c) 2001, 2002 Fabrice Bellard * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_MATHOPS_H #define AVCODEC_MATHOPS_H #include <stdint.h> #include "libavutil/common.h" #include "config.h" extern const uint32_t ff_inverse[257]; extern const uint8_t ff_reverse[256]; extern const uint8_t ff_sqrt_tab[256]; #if ARCH_ARM # include "arm/mathops.h" #elif ARCH_AVR32 # include "avr32/mathops.h" #elif ARCH_BFIN # include "bfin/mathops.h" #elif ARCH_MIPS # include "mips/mathops.h" #elif ARCH_PPC # include "ppc/mathops.h" #elif ARCH_X86 # include "x86/mathops.h" #endif /* generic implementation */ #ifndef MUL64 # define MUL64(a,b) ((int64_t)(a) * (int64_t)(b)) #endif #ifndef MULL # define MULL(a,b,s) (MUL64(a, b) >> (s)) #endif #ifndef MULH static av_always_inline int MULH(int a, int b){ return MUL64(a, b) >> 32; } #endif #ifndef UMULH static av_always_inline unsigned UMULH(unsigned a, unsigned b){ return ((uint64_t)(a) * (uint64_t)(b))>>32; } #endif #ifndef MAC64 # define MAC64(d, a, b) ((d) += MUL64(a, b)) #endif #ifndef MLS64 # define MLS64(d, a, b) ((d) -= MUL64(a, b)) #endif /* signed 16x16 -> 32 multiply add accumulate */ #ifndef MAC16 # define MAC16(rt, ra, rb) rt += (ra) * (rb) #endif /* signed 16x16 -> 32 multiply */ #ifndef MUL16 # define MUL16(ra, rb) ((ra) * (rb)) #endif #ifndef MLS16 # define MLS16(rt, ra, rb) ((rt) -= (ra) * (rb)) #endif /* median of 3 */ #ifndef mid_pred #define mid_pred mid_pred static inline av_const int mid_pred(int a, int b, int c) { #if 0 int t= (a-b)&((a-b)>>31); a-=t; b+=t; b-= (b-c)&((b-c)>>31); b+= (a-b)&((a-b)>>31); return b; #else if(a>b){ if(c>b){ if(c>a) b=a; else b=c; } }else{ if(b>c){ if(c>a) b=c; else b=a; } } return b; #endif } #endif #ifndef sign_extend static inline av_const int sign_extend(int val, unsigned bits) { unsigned shift = 8 * sizeof(int) - bits; union { unsigned u; int s; } v = { (unsigned) val << shift }; return v.s >> shift; } #endif #ifndef zero_extend static inline av_const unsigned zero_extend(unsigned val, unsigned bits) { return (val << ((8 * sizeof(int)) - bits)) >> ((8 * sizeof(int)) - bits); } #endif #ifndef COPY3_IF_LT #define COPY3_IF_LT(x, y, a, b, c, d)\ if ((y) < (x)) {\ (x) = (y);\ (a) = (b);\ (c) = (d);\ } #endif #ifndef MASK_ABS #define MASK_ABS(mask, level) do { \ mask = level >> 31; \ level = (level ^ mask) - mask; \ } while (0) #endif #ifndef NEG_SSR32 # define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s))) #endif #ifndef NEG_USR32 # define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s))) #endif #if HAVE_BIGENDIAN # ifndef PACK_2U8 # define PACK_2U8(a,b) (((a) << 8) | (b)) # endif # ifndef PACK_4U8 # define PACK_4U8(a,b,c,d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d)) # endif # ifndef PACK_2U16 # define PACK_2U16(a,b) (((a) << 16) | (b)) # endif #else # ifndef PACK_2U8 # define PACK_2U8(a,b) (((b) << 8) | (a)) # endif # ifndef PACK_4U2 # define PACK_4U8(a,b,c,d) (((d) << 24) | ((c) << 16) | ((b) << 8) | (a)) # endif # ifndef PACK_2U16 # define PACK_2U16(a,b) (((b) << 16) | (a)) # endif #endif #ifndef PACK_2S8 # define PACK_2S8(a,b) PACK_2U8((a)&255, (b)&255) #endif #ifndef PACK_4S8 # define PACK_4S8(a,b,c,d) PACK_4U8((a)&255, (b)&255, (c)&255, (d)&255) #endif #ifndef PACK_2S16 # define PACK_2S16(a,b) PACK_2U16((a)&0xffff, (b)&0xffff) #endif #ifndef FASTDIV # define FASTDIV(a,b) ((uint32_t)((((uint64_t)a) * ff_inverse[b]) >> 32)) #endif /* FASTDIV */ static inline av_const unsigned int ff_sqrt(unsigned int a) { unsigned int b; if (a < 255) return (ff_sqrt_tab[a + 1] - 1) >> 4; else if (a < (1 << 12)) b = ff_sqrt_tab[a >> 4] >> 2; #if !CONFIG_SMALL else if (a < (1 << 14)) b = ff_sqrt_tab[a >> 6] >> 1; else if (a < (1 << 16)) b = ff_sqrt_tab[a >> 8] ; #endif else { int s = av_log2_16bit(a >> 16) >> 1; unsigned int c = a >> (s + 2); b = ff_sqrt_tab[c >> (s + 8)]; b = FASTDIV(c,b) + (b << s); } return b - (a < b * b); } #endif /* AVCODEC_MATHOPS_H */