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1 /*
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2 * simple math operations
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3 * Copyright (c) 2001, 2002 Fabrice Bellard
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4 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
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5 *
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6 * This file is part of FFmpeg.
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7 *
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8 * FFmpeg is free software; you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public
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10 * License as published by the Free Software Foundation; either
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11 * version 2.1 of the License, or (at your option) any later version.
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12 *
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13 * FFmpeg is distributed in the hope that it will be useful,
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14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with FFmpeg; if not, write to the Free Software
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20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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21 */
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22 #ifndef AVCODEC_MATHOPS_H
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23 #define AVCODEC_MATHOPS_H
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24
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25 #include <stdint.h>
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26
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27 #include "libavutil/common.h"
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28 #include "config.h"
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29
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30 #define MAX_NEG_CROP 1024
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31
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32 extern const uint32_t ff_inverse[257];
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33 extern const uint8_t ff_reverse[256];
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34 extern const uint8_t ff_sqrt_tab[256];
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35 extern const uint8_t ff_crop_tab[256 + 2 * MAX_NEG_CROP];
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36 extern const uint8_t ff_zigzag_direct[64];
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37
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38 #if ARCH_ARM
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39 # include "arm/mathops.h"
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40 #elif ARCH_AVR32
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41 # include "avr32/mathops.h"
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42 #elif ARCH_MIPS
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43 # include "mips/mathops.h"
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44 #elif ARCH_PPC
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45 # include "ppc/mathops.h"
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46 #elif ARCH_X86
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47 # include "x86/mathops.h"
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48 #endif
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49
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50 /* generic implementation */
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51
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52 #ifndef MUL64
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53 # define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
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54 #endif
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55
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56 #ifndef MULL
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57 # define MULL(a,b,s) (MUL64(a, b) >> (s))
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58 #endif
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59
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60 #ifndef MULH
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61 static av_always_inline int MULH(int a, int b){
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62 return MUL64(a, b) >> 32;
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63 }
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64 #endif
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65
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66 #ifndef UMULH
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67 static av_always_inline unsigned UMULH(unsigned a, unsigned b){
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68 return ((uint64_t)(a) * (uint64_t)(b))>>32;
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69 }
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70 #endif
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71
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72 #ifndef MAC64
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73 # define MAC64(d, a, b) ((d) += MUL64(a, b))
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74 #endif
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75
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76 #ifndef MLS64
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77 # define MLS64(d, a, b) ((d) -= MUL64(a, b))
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78 #endif
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79
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80 /* signed 16x16 -> 32 multiply add accumulate */
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81 #ifndef MAC16
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82 # define MAC16(rt, ra, rb) rt += (ra) * (rb)
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83 #endif
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84
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85 /* signed 16x16 -> 32 multiply */
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86 #ifndef MUL16
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87 # define MUL16(ra, rb) ((ra) * (rb))
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88 #endif
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89
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90 #ifndef MLS16
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91 # define MLS16(rt, ra, rb) ((rt) -= (ra) * (rb))
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92 #endif
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93
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94 /* median of 3 */
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95 #ifndef mid_pred
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96 #define mid_pred mid_pred
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97 static inline av_const int mid_pred(int a, int b, int c)
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98 {
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99 #if 0
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100 int t= (a-b)&((a-b)>>31);
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101 a-=t;
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102 b+=t;
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103 b-= (b-c)&((b-c)>>31);
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104 b+= (a-b)&((a-b)>>31);
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105
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106 return b;
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107 #else
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108 if(a>b){
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109 if(c>b){
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110 if(c>a) b=a;
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111 else b=c;
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112 }
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113 }else{
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114 if(b>c){
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115 if(c>a) b=c;
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116 else b=a;
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117 }
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118 }
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119 return b;
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120 #endif
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121 }
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122 #endif
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123
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124 #ifndef sign_extend
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125 static inline av_const int sign_extend(int val, unsigned bits)
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126 {
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127 unsigned shift = 8 * sizeof(int) - bits;
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128 union { unsigned u; int s; } v = { (unsigned) val << shift };
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129 return v.s >> shift;
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130 }
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131 #endif
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132
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133 #ifndef zero_extend
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134 static inline av_const unsigned zero_extend(unsigned val, unsigned bits)
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135 {
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136 return (val << ((8 * sizeof(int)) - bits)) >> ((8 * sizeof(int)) - bits);
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137 }
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138 #endif
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139
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140 #ifndef COPY3_IF_LT
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141 #define COPY3_IF_LT(x, y, a, b, c, d)\
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142 if ((y) < (x)) {\
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143 (x) = (y);\
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144 (a) = (b);\
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145 (c) = (d);\
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146 }
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147 #endif
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148
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149 #ifndef MASK_ABS
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150 #define MASK_ABS(mask, level) do { \
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151 mask = level >> 31; \
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152 level = (level ^ mask) - mask; \
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153 } while (0)
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154 #endif
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155
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156 #ifndef NEG_SSR32
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157 # define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s)))
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158 #endif
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159
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160 #ifndef NEG_USR32
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161 # define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s)))
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162 #endif
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163
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164 #if HAVE_BIGENDIAN
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165 # ifndef PACK_2U8
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166 # define PACK_2U8(a,b) (((a) << 8) | (b))
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167 # endif
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168 # ifndef PACK_4U8
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169 # define PACK_4U8(a,b,c,d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
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170 # endif
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171 # ifndef PACK_2U16
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172 # define PACK_2U16(a,b) (((a) << 16) | (b))
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173 # endif
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174 #else
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175 # ifndef PACK_2U8
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176 # define PACK_2U8(a,b) (((b) << 8) | (a))
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177 # endif
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178 # ifndef PACK_4U2
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179 # define PACK_4U8(a,b,c,d) (((d) << 24) | ((c) << 16) | ((b) << 8) | (a))
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180 # endif
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181 # ifndef PACK_2U16
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182 # define PACK_2U16(a,b) (((b) << 16) | (a))
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183 # endif
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184 #endif
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185
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186 #ifndef PACK_2S8
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187 # define PACK_2S8(a,b) PACK_2U8((a)&255, (b)&255)
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188 #endif
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189 #ifndef PACK_4S8
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190 # define PACK_4S8(a,b,c,d) PACK_4U8((a)&255, (b)&255, (c)&255, (d)&255)
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191 #endif
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192 #ifndef PACK_2S16
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193 # define PACK_2S16(a,b) PACK_2U16((a)&0xffff, (b)&0xffff)
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194 #endif
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195
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196 #ifndef FASTDIV
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197 # define FASTDIV(a,b) ((uint32_t)((((uint64_t)a) * ff_inverse[b]) >> 32))
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198 #endif /* FASTDIV */
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199
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200 static inline av_const unsigned int ff_sqrt(unsigned int a)
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201 {
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202 unsigned int b;
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203
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204 if (a < 255) return (ff_sqrt_tab[a + 1] - 1) >> 4;
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205 else if (a < (1 << 12)) b = ff_sqrt_tab[a >> 4] >> 2;
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206 #if !CONFIG_SMALL
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207 else if (a < (1 << 14)) b = ff_sqrt_tab[a >> 6] >> 1;
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208 else if (a < (1 << 16)) b = ff_sqrt_tab[a >> 8] ;
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209 #endif
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210 else {
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211 int s = av_log2_16bit(a >> 16) >> 1;
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212 unsigned int c = a >> (s + 2);
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213 b = ff_sqrt_tab[c >> (s + 8)];
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214 b = FASTDIV(c,b) + (b << s);
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215 }
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216
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217 return b - (a < b * b);
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218 }
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219
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220 static inline int8_t ff_u8_to_s8(uint8_t a)
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221 {
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222 union {
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223 uint8_t u8;
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224 int8_t s8;
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225 } b;
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226 b.u8 = a;
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227 return b.s8;
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228 }
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229
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230 #endif /* AVCODEC_MATHOPS_H */
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