git.sesse.net Git - ffmpeg/blob - libavcodec/mathtables.c

   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * Libav is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with Libav; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #include <stdint.h>
  20
  21 #include "mathops.h"
  22
  23 /* a*inverse[b]>>32 == a/b for all 0<=a<=16909558 && 2<=b<=256
  24  * for a>16909558, is an overestimate by less than 1 part in 1<<24 */
  25 const uint32_t ff_inverse[257]={
  26          0, 4294967295U,2147483648U,1431655766, 1073741824,  858993460,  715827883,  613566757,
  27  536870912,  477218589,  429496730,  390451573,  357913942,  330382100,  306783379,  286331154,
  28  268435456,  252645136,  238609295,  226050911,  214748365,  204522253,  195225787,  186737709,
  29  178956971,  171798692,  165191050,  159072863,  153391690,  148102321,  143165577,  138547333,
  30  134217728,  130150525,  126322568,  122713352,  119304648,  116080198,  113025456,  110127367,
  31  107374183,  104755300,  102261127,   99882961,   97612894,   95443718,   93368855,   91382283,
  32   89478486,   87652394,   85899346,   84215046,   82595525,   81037119,   79536432,   78090315,
  33   76695845,   75350304,   74051161,   72796056,   71582789,   70409300,   69273667,   68174085,
  34   67108864,   66076420,   65075263,   64103990,   63161284,   62245903,   61356676,   60492498,
  35   59652324,   58835169,   58040099,   57266231,   56512728,   55778797,   55063684,   54366675,
  36   53687092,   53024288,   52377650,   51746594,   51130564,   50529028,   49941481,   49367441,
  37   48806447,   48258060,   47721859,   47197443,   46684428,   46182445,   45691142,   45210183,
  38   44739243,   44278014,   43826197,   43383509,   42949673,   42524429,   42107523,   41698712,
  39   41297763,   40904451,   40518560,   40139882,   39768216,   39403370,   39045158,   38693400,
  40   38347923,   38008561,   37675152,   37347542,   37025581,   36709123,   36398028,   36092163,
  41   35791395,   35495598,   35204650,   34918434,   34636834,   34359739,   34087043,   33818641,
  42   33554432,   33294321,   33038210,   32786010,   32537632,   32292988,   32051995,   31814573,
  43   31580642,   31350127,   31122952,   30899046,   30678338,   30460761,   30246249,   30034737,
  44   29826162,   29620465,   29417585,   29217465,   29020050,   28825284,   28633116,   28443493,
  45   28256364,   28071682,   27889399,   27709467,   27531842,   27356480,   27183338,   27012373,
  46   26843546,   26676816,   26512144,   26349493,   26188825,   26030105,   25873297,   25718368,
  47   25565282,   25414008,   25264514,   25116768,   24970741,   24826401,   24683721,   24542671,
  48   24403224,   24265352,   24129030,   23994231,   23860930,   23729102,   23598722,   23469767,
  49   23342214,   23216040,   23091223,   22967740,   22845571,   22724695,   22605092,   22486740,
  50   22369622,   22253717,   22139007,   22025474,   21913099,   21801865,   21691755,   21582751,
  51   21474837,   21367997,   21262215,   21157475,   21053762,   20951060,   20849356,   20748635,
  52   20648882,   20550083,   20452226,   20355296,   20259280,   20164166,   20069941,   19976593,
  53   19884108,   19792477,   19701685,   19611723,   19522579,   19434242,   19346700,   19259944,
  54   19173962,   19088744,   19004281,   18920561,   18837576,   18755316,   18673771,   18592933,
  55   18512791,   18433337,   18354562,   18276457,   18199014,   18122225,   18046082,   17970575,
  56   17895698,   17821442,   17747799,   17674763,   17602325,   17530479,   17459217,   17388532,
  57   17318417,   17248865,   17179870,   17111424,   17043522,   16976156,   16909321,   16843010,
  58   16777216
  59 };
  60
  61 const uint8_t ff_sqrt_tab[256]={
  62   0, 16, 23, 28, 32, 36, 40, 43, 46, 48, 51, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 77, 79, 80, 82, 84, 85, 87, 88, 90,
  63  91, 92, 94, 95, 96, 98, 99,100,102,103,104,105,107,108,109,110,111,112,114,115,116,117,118,119,120,121,122,123,124,125,126,127,
  64 128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,144,145,146,147,148,149,150,151,151,152,153,154,155,156,156,
  65 157,158,159,160,160,161,162,163,164,164,165,166,167,168,168,169,170,171,171,172,173,174,174,175,176,176,177,178,179,179,180,181,
  66 182,182,183,184,184,185,186,186,187,188,188,189,190,190,191,192,192,193,194,194,195,196,196,197,198,198,199,200,200,201,202,202,
  67 203,204,204,205,205,206,207,207,208,208,209,210,210,211,212,212,213,213,214,215,215,216,216,217,218,218,219,219,220,220,221,222,
  68 222,223,223,224,224,225,226,226,227,227,228,228,229,230,230,231,231,232,232,233,233,234,235,235,236,236,237,237,238,238,239,239,
  69 240,240,241,242,242,243,243,244,244,245,245,246,246,247,247,248,248,249,249,250,250,251,251,252,252,253,253,254,254,255,255,255
  70 };
  71
  72 const uint8_t ff_reverse[256] = {
  73 0x00,0x80,0x40,0xC0,0x20,0xA0,0x60,0xE0,0x10,0x90,0x50,0xD0,0x30,0xB0,0x70,0xF0,
  74 0x08,0x88,0x48,0xC8,0x28,0xA8,0x68,0xE8,0x18,0x98,0x58,0xD8,0x38,0xB8,0x78,0xF8,
  75 0x04,0x84,0x44,0xC4,0x24,0xA4,0x64,0xE4,0x14,0x94,0x54,0xD4,0x34,0xB4,0x74,0xF4,
  76 0x0C,0x8C,0x4C,0xCC,0x2C,0xAC,0x6C,0xEC,0x1C,0x9C,0x5C,0xDC,0x3C,0xBC,0x7C,0xFC,
  77 0x02,0x82,0x42,0xC2,0x22,0xA2,0x62,0xE2,0x12,0x92,0x52,0xD2,0x32,0xB2,0x72,0xF2,
  78 0x0A,0x8A,0x4A,0xCA,0x2A,0xAA,0x6A,0xEA,0x1A,0x9A,0x5A,0xDA,0x3A,0xBA,0x7A,0xFA,
  79 0x06,0x86,0x46,0xC6,0x26,0xA6,0x66,0xE6,0x16,0x96,0x56,0xD6,0x36,0xB6,0x76,0xF6,
  80 0x0E,0x8E,0x4E,0xCE,0x2E,0xAE,0x6E,0xEE,0x1E,0x9E,0x5E,0xDE,0x3E,0xBE,0x7E,0xFE,
  81 0x01,0x81,0x41,0xC1,0x21,0xA1,0x61,0xE1,0x11,0x91,0x51,0xD1,0x31,0xB1,0x71,0xF1,
  82 0x09,0x89,0x49,0xC9,0x29,0xA9,0x69,0xE9,0x19,0x99,0x59,0xD9,0x39,0xB9,0x79,0xF9,
  83 0x05,0x85,0x45,0xC5,0x25,0xA5,0x65,0xE5,0x15,0x95,0x55,0xD5,0x35,0xB5,0x75,0xF5,
  84 0x0D,0x8D,0x4D,0xCD,0x2D,0xAD,0x6D,0xED,0x1D,0x9D,0x5D,0xDD,0x3D,0xBD,0x7D,0xFD,
  85 0x03,0x83,0x43,0xC3,0x23,0xA3,0x63,0xE3,0x13,0x93,0x53,0xD3,0x33,0xB3,0x73,0xF3,
  86 0x0B,0x8B,0x4B,0xCB,0x2B,0xAB,0x6B,0xEB,0x1B,0x9B,0x5B,0xDB,0x3B,0xBB,0x7B,0xFB,
  87 0x07,0x87,0x47,0xC7,0x27,0xA7,0x67,0xE7,0x17,0x97,0x57,0xD7,0x37,0xB7,0x77,0xF7,
  88 0x0F,0x8F,0x4F,0xCF,0x2F,0xAF,0x6F,0xEF,0x1F,0x9F,0x5F,0xDF,0x3F,0xBF,0x7F,0xFF,
  89 };
  90
  91 #define times4(x) x, x, x, x
  92 #define times256(x) times4(times4(times4(times4(times4(x)))))
  93
  94 const uint8_t ff_crop_tab[256 + 2 * MAX_NEG_CROP] = {
  95 times256(0x00),
  96 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,
  97 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,
  98 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,
  99 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F,
 100 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,
 101 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0x5B,0x5C,0x5D,0x5E,0x5F,
 102 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,
 103 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0x7B,0x7C,0x7D,0x7E,0x7F,
 104 0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,
 105 0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,
 106 0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,
 107 0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF,
 108 0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,
 109 0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF,
 110 0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,
 111 0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF,
 112 times256(0xFF)
 113 };
 114
 115 const uint8_t ff_zigzag_direct[64] = {
 116     0,   1,  8, 16,  9,  2,  3, 10,
 117     17, 24, 32, 25, 18, 11,  4,  5,
 118     12, 19, 26, 33, 40, 48, 41, 34,
 119     27, 20, 13,  6,  7, 14, 21, 28,
 120     35, 42, 49, 56, 57, 50, 43, 36,
 121     29, 22, 15, 23, 30, 37, 44, 51,
 122     58, 59, 52, 45, 38, 31, 39, 46,
 123     53, 60, 61, 54, 47, 55, 62, 63
 124 };