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4349 | Serge | 1 | /* |
2 | * Copyright (c) 2005-2012 Michael Niedermayer |
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3 | * |
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4 | * This file is part of FFmpeg. |
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5 | * |
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6 | * FFmpeg is free software; you can redistribute it and/or |
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7 | * modify it under the terms of the GNU Lesser General Public |
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8 | * License as published by the Free Software Foundation; either |
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9 | * version 2.1 of the License, or (at your option) any later version. |
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10 | * |
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11 | * FFmpeg is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | * Lesser General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU Lesser General Public |
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17 | * License along with FFmpeg; if not, write to the Free Software |
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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19 | */ |
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20 | |||
21 | /** |
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22 | * @file |
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23 | * miscellaneous math routines and tables |
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24 | */ |
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25 | |||
26 | #include |
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27 | #include |
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28 | |||
29 | #include "mathematics.h" |
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30 | #include "libavutil/common.h" |
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31 | #include "avassert.h" |
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32 | #include "version.h" |
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33 | |||
34 | #if FF_API_AV_REVERSE |
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35 | const uint8_t av_reverse[256]={ |
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36 | 0x00,0x80,0x40,0xC0,0x20,0xA0,0x60,0xE0,0x10,0x90,0x50,0xD0,0x30,0xB0,0x70,0xF0, |
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37 | 0x08,0x88,0x48,0xC8,0x28,0xA8,0x68,0xE8,0x18,0x98,0x58,0xD8,0x38,0xB8,0x78,0xF8, |
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38 | 0x04,0x84,0x44,0xC4,0x24,0xA4,0x64,0xE4,0x14,0x94,0x54,0xD4,0x34,0xB4,0x74,0xF4, |
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39 | 0x0C,0x8C,0x4C,0xCC,0x2C,0xAC,0x6C,0xEC,0x1C,0x9C,0x5C,0xDC,0x3C,0xBC,0x7C,0xFC, |
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40 | 0x02,0x82,0x42,0xC2,0x22,0xA2,0x62,0xE2,0x12,0x92,0x52,0xD2,0x32,0xB2,0x72,0xF2, |
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41 | 0x0A,0x8A,0x4A,0xCA,0x2A,0xAA,0x6A,0xEA,0x1A,0x9A,0x5A,0xDA,0x3A,0xBA,0x7A,0xFA, |
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42 | 0x06,0x86,0x46,0xC6,0x26,0xA6,0x66,0xE6,0x16,0x96,0x56,0xD6,0x36,0xB6,0x76,0xF6, |
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43 | 0x0E,0x8E,0x4E,0xCE,0x2E,0xAE,0x6E,0xEE,0x1E,0x9E,0x5E,0xDE,0x3E,0xBE,0x7E,0xFE, |
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44 | 0x01,0x81,0x41,0xC1,0x21,0xA1,0x61,0xE1,0x11,0x91,0x51,0xD1,0x31,0xB1,0x71,0xF1, |
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45 | 0x09,0x89,0x49,0xC9,0x29,0xA9,0x69,0xE9,0x19,0x99,0x59,0xD9,0x39,0xB9,0x79,0xF9, |
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46 | 0x05,0x85,0x45,0xC5,0x25,0xA5,0x65,0xE5,0x15,0x95,0x55,0xD5,0x35,0xB5,0x75,0xF5, |
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47 | 0x0D,0x8D,0x4D,0xCD,0x2D,0xAD,0x6D,0xED,0x1D,0x9D,0x5D,0xDD,0x3D,0xBD,0x7D,0xFD, |
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48 | 0x03,0x83,0x43,0xC3,0x23,0xA3,0x63,0xE3,0x13,0x93,0x53,0xD3,0x33,0xB3,0x73,0xF3, |
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49 | 0x0B,0x8B,0x4B,0xCB,0x2B,0xAB,0x6B,0xEB,0x1B,0x9B,0x5B,0xDB,0x3B,0xBB,0x7B,0xFB, |
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50 | 0x07,0x87,0x47,0xC7,0x27,0xA7,0x67,0xE7,0x17,0x97,0x57,0xD7,0x37,0xB7,0x77,0xF7, |
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51 | 0x0F,0x8F,0x4F,0xCF,0x2F,0xAF,0x6F,0xEF,0x1F,0x9F,0x5F,0xDF,0x3F,0xBF,0x7F,0xFF, |
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52 | }; |
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53 | #endif |
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54 | |||
55 | int64_t av_gcd(int64_t a, int64_t b){ |
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56 | if(b) return av_gcd(b, a%b); |
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57 | else return a; |
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58 | } |
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59 | |||
60 | int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd){ |
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61 | int64_t r=0; |
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62 | av_assert2(c > 0); |
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63 | av_assert2(b >=0); |
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64 | av_assert2((unsigned)(rnd&~AV_ROUND_PASS_MINMAX)<=5 && (rnd&~AV_ROUND_PASS_MINMAX)!=4); |
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65 | |||
66 | if (rnd & AV_ROUND_PASS_MINMAX) { |
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67 | if (a == INT64_MIN || a == INT64_MAX) |
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68 | return a; |
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69 | rnd -= AV_ROUND_PASS_MINMAX; |
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70 | } |
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71 | |||
72 | if(a<0 && a != INT64_MIN) return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd>>1)&1)); |
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73 | |||
74 | if(rnd==AV_ROUND_NEAR_INF) r= c/2; |
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75 | else if(rnd&1) r= c-1; |
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76 | |||
77 | if(b<=INT_MAX && c<=INT_MAX){ |
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78 | if(a<=INT_MAX) |
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79 | return (a * b + r)/c; |
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80 | else |
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81 | return a/c*b + (a%c*b + r)/c; |
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82 | }else{ |
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83 | #if 1 |
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84 | uint64_t a0= a&0xFFFFFFFF; |
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85 | uint64_t a1= a>>32; |
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86 | uint64_t b0= b&0xFFFFFFFF; |
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87 | uint64_t b1= b>>32; |
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88 | uint64_t t1= a0*b1 + a1*b0; |
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89 | uint64_t t1a= t1<<32; |
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90 | int i; |
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91 | |||
92 | a0 = a0*b0 + t1a; |
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93 | a1 = a1*b1 + (t1>>32) + (a0 |
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94 | a0 += r; |
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95 | a1 += a0 |
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96 | |||
97 | for(i=63; i>=0; i--){ |
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98 | // int o= a1 & 0x8000000000000000ULL; |
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99 | a1+= a1 + ((a0>>i)&1); |
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100 | t1+=t1; |
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101 | if(/*o || */c <= a1){ |
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102 | a1 -= c; |
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103 | t1++; |
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104 | } |
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105 | } |
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106 | return t1; |
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107 | } |
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108 | #else |
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109 | AVInteger ai; |
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110 | ai= av_mul_i(av_int2i(a), av_int2i(b)); |
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111 | ai= av_add_i(ai, av_int2i(r)); |
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112 | |||
113 | return av_i2int(av_div_i(ai, av_int2i(c))); |
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114 | } |
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115 | #endif |
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116 | } |
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117 | |||
118 | int64_t av_rescale(int64_t a, int64_t b, int64_t c){ |
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119 | return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF); |
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120 | } |
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121 | |||
122 | int64_t av_rescale_q_rnd(int64_t a, AVRational bq, AVRational cq, |
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123 | enum AVRounding rnd) |
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124 | { |
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125 | int64_t b= bq.num * (int64_t)cq.den; |
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126 | int64_t c= cq.num * (int64_t)bq.den; |
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127 | return av_rescale_rnd(a, b, c, rnd); |
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128 | } |
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129 | |||
130 | int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) |
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131 | { |
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132 | return av_rescale_q_rnd(a, bq, cq, AV_ROUND_NEAR_INF); |
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133 | } |
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134 | |||
135 | int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b){ |
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136 | int64_t a= tb_a.num * (int64_t)tb_b.den; |
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137 | int64_t b= tb_b.num * (int64_t)tb_a.den; |
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138 | if((FFABS(ts_a)|a|FFABS(ts_b)|b)<=INT_MAX) |
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139 | return (ts_a*a > ts_b*b) - (ts_a*a < ts_b*b); |
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140 | if (av_rescale_rnd(ts_a, a, b, AV_ROUND_DOWN) < ts_b) return -1; |
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141 | if (av_rescale_rnd(ts_b, b, a, AV_ROUND_DOWN) < ts_a) return 1; |
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142 | return 0; |
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143 | } |
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144 | |||
145 | int64_t av_compare_mod(uint64_t a, uint64_t b, uint64_t mod){ |
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146 | int64_t c= (a-b) & (mod-1); |
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147 | if(c > (mod>>1)) |
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148 | c-= mod; |
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149 | return c; |
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150 | } |
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151 | |||
152 | int64_t av_rescale_delta(AVRational in_tb, int64_t in_ts, AVRational fs_tb, int duration, int64_t *last, AVRational out_tb){ |
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153 | int64_t a, b, this; |
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154 | |||
155 | av_assert0(in_ts != AV_NOPTS_VALUE); |
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156 | av_assert0(duration >= 0); |
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157 | |||
158 | if (*last == AV_NOPTS_VALUE || !duration || in_tb.num*(int64_t)out_tb.den <= out_tb.num*(int64_t)in_tb.den) { |
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159 | simple_round: |
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160 | *last = av_rescale_q(in_ts, in_tb, fs_tb) + duration; |
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161 | return av_rescale_q(in_ts, in_tb, out_tb); |
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162 | } |
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163 | |||
164 | a = av_rescale_q_rnd(2*in_ts-1, in_tb, fs_tb, AV_ROUND_DOWN) >>1; |
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165 | b = (av_rescale_q_rnd(2*in_ts+1, in_tb, fs_tb, AV_ROUND_UP )+1)>>1; |
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166 | if (*last < 2*a - b || *last > 2*b - a) |
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167 | goto simple_round; |
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168 | |||
169 | this = av_clip64(*last, a, b); |
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170 | *last = this + duration; |
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171 | |||
172 | return av_rescale_q(this, fs_tb, out_tb); |
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173 | }>=>>>>=INT_MAX) |