Make ff_inverse stay with libavutil, and optional copy it to libavcodec.
The ff_inverse table is used by FASTDIV macro, defined in libavutil, but up
to now the table was defined only in libavcodec.
After this change, the main copy of ff_inverse is part of libavutil (just
like FASTDIV), but if CONFIG_SMALL is unset, then a different copy is made
available to libavcodec, to avoid the performance penalty of using an
external look up table.
Dynamic linking works, because the libraries are linked with -Bsymbolic, so
the local copy of the symbol has priority over the external; static linking
works because the table is on a standalone object file in both libraries,
so the linker is able to discard one of the two.
Tested on Linux/x86-64 and Mac OS X/x86-64.
Originally committed as revision 24383 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-07-21 15:37:37 +03:00
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/*
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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2011-06-05 16:27:51 +03:00
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#include <stdint.h>
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Make ff_inverse stay with libavutil, and optional copy it to libavcodec.
The ff_inverse table is used by FASTDIV macro, defined in libavutil, but up
to now the table was defined only in libavcodec.
After this change, the main copy of ff_inverse is part of libavutil (just
like FASTDIV), but if CONFIG_SMALL is unset, then a different copy is made
available to libavcodec, to avoid the performance penalty of using an
external look up table.
Dynamic linking works, because the libraries are linked with -Bsymbolic, so
the local copy of the symbol has priority over the external; static linking
works because the table is on a standalone object file in both libraries,
so the linker is able to discard one of the two.
Tested on Linux/x86-64 and Mac OS X/x86-64.
Originally committed as revision 24383 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-07-21 15:37:37 +03:00
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/* a*inverse[b]>>32 == a/b for all 0<=a<=16909558 && 2<=b<=256
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* for a>16909558, is an overestimate by less than 1 part in 1<<24 */
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const uint32_t ff_inverse[257]={
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0, 4294967295U,2147483648U,1431655766, 1073741824, 858993460, 715827883, 613566757,
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536870912, 477218589, 429496730, 390451573, 357913942, 330382100, 306783379, 286331154,
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268435456, 252645136, 238609295, 226050911, 214748365, 204522253, 195225787, 186737709,
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178956971, 171798692, 165191050, 159072863, 153391690, 148102321, 143165577, 138547333,
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134217728, 130150525, 126322568, 122713352, 119304648, 116080198, 113025456, 110127367,
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107374183, 104755300, 102261127, 99882961, 97612894, 95443718, 93368855, 91382283,
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89478486, 87652394, 85899346, 84215046, 82595525, 81037119, 79536432, 78090315,
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76695845, 75350304, 74051161, 72796056, 71582789, 70409300, 69273667, 68174085,
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67108864, 66076420, 65075263, 64103990, 63161284, 62245903, 61356676, 60492498,
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59652324, 58835169, 58040099, 57266231, 56512728, 55778797, 55063684, 54366675,
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53687092, 53024288, 52377650, 51746594, 51130564, 50529028, 49941481, 49367441,
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48806447, 48258060, 47721859, 47197443, 46684428, 46182445, 45691142, 45210183,
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44739243, 44278014, 43826197, 43383509, 42949673, 42524429, 42107523, 41698712,
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41297763, 40904451, 40518560, 40139882, 39768216, 39403370, 39045158, 38693400,
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38347923, 38008561, 37675152, 37347542, 37025581, 36709123, 36398028, 36092163,
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35791395, 35495598, 35204650, 34918434, 34636834, 34359739, 34087043, 33818641,
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33554432, 33294321, 33038210, 32786010, 32537632, 32292988, 32051995, 31814573,
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31580642, 31350127, 31122952, 30899046, 30678338, 30460761, 30246249, 30034737,
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29826162, 29620465, 29417585, 29217465, 29020050, 28825284, 28633116, 28443493,
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28256364, 28071682, 27889399, 27709467, 27531842, 27356480, 27183338, 27012373,
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26843546, 26676816, 26512144, 26349493, 26188825, 26030105, 25873297, 25718368,
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25565282, 25414008, 25264514, 25116768, 24970741, 24826401, 24683721, 24542671,
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24403224, 24265352, 24129030, 23994231, 23860930, 23729102, 23598722, 23469767,
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23342214, 23216040, 23091223, 22967740, 22845571, 22724695, 22605092, 22486740,
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22369622, 22253717, 22139007, 22025474, 21913099, 21801865, 21691755, 21582751,
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21474837, 21367997, 21262215, 21157475, 21053762, 20951060, 20849356, 20748635,
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20648882, 20550083, 20452226, 20355296, 20259280, 20164166, 20069941, 19976593,
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19884108, 19792477, 19701685, 19611723, 19522579, 19434242, 19346700, 19259944,
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19173962, 19088744, 19004281, 18920561, 18837576, 18755316, 18673771, 18592933,
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18512791, 18433337, 18354562, 18276457, 18199014, 18122225, 18046082, 17970575,
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17895698, 17821442, 17747799, 17674763, 17602325, 17530479, 17459217, 17388532,
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17318417, 17248865, 17179870, 17111424, 17043522, 16976156, 16909321, 16843010,
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16777216
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};
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2012-10-11 02:16:05 +03:00
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2012-10-22 10:14:43 +03:00
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const uint8_t ff_sqrt_tab[256]={
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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,
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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,
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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,
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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,
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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,
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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,
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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,
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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
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};
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2012-10-11 19:50:30 +03:00
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const uint8_t ff_reverse[256] = {
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0x00,0x80,0x40,0xC0,0x20,0xA0,0x60,0xE0,0x10,0x90,0x50,0xD0,0x30,0xB0,0x70,0xF0,
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0x08,0x88,0x48,0xC8,0x28,0xA8,0x68,0xE8,0x18,0x98,0x58,0xD8,0x38,0xB8,0x78,0xF8,
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0x04,0x84,0x44,0xC4,0x24,0xA4,0x64,0xE4,0x14,0x94,0x54,0xD4,0x34,0xB4,0x74,0xF4,
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0x0C,0x8C,0x4C,0xCC,0x2C,0xAC,0x6C,0xEC,0x1C,0x9C,0x5C,0xDC,0x3C,0xBC,0x7C,0xFC,
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0x02,0x82,0x42,0xC2,0x22,0xA2,0x62,0xE2,0x12,0x92,0x52,0xD2,0x32,0xB2,0x72,0xF2,
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0x0A,0x8A,0x4A,0xCA,0x2A,0xAA,0x6A,0xEA,0x1A,0x9A,0x5A,0xDA,0x3A,0xBA,0x7A,0xFA,
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0x06,0x86,0x46,0xC6,0x26,0xA6,0x66,0xE6,0x16,0x96,0x56,0xD6,0x36,0xB6,0x76,0xF6,
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0x0E,0x8E,0x4E,0xCE,0x2E,0xAE,0x6E,0xEE,0x1E,0x9E,0x5E,0xDE,0x3E,0xBE,0x7E,0xFE,
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0x01,0x81,0x41,0xC1,0x21,0xA1,0x61,0xE1,0x11,0x91,0x51,0xD1,0x31,0xB1,0x71,0xF1,
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0x09,0x89,0x49,0xC9,0x29,0xA9,0x69,0xE9,0x19,0x99,0x59,0xD9,0x39,0xB9,0x79,0xF9,
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0x05,0x85,0x45,0xC5,0x25,0xA5,0x65,0xE5,0x15,0x95,0x55,0xD5,0x35,0xB5,0x75,0xF5,
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0x0D,0x8D,0x4D,0xCD,0x2D,0xAD,0x6D,0xED,0x1D,0x9D,0x5D,0xDD,0x3D,0xBD,0x7D,0xFD,
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0x03,0x83,0x43,0xC3,0x23,0xA3,0x63,0xE3,0x13,0x93,0x53,0xD3,0x33,0xB3,0x73,0xF3,
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0x0B,0x8B,0x4B,0xCB,0x2B,0xAB,0x6B,0xEB,0x1B,0x9B,0x5B,0xDB,0x3B,0xBB,0x7B,0xFB,
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0x07,0x87,0x47,0xC7,0x27,0xA7,0x67,0xE7,0x17,0x97,0x57,0xD7,0x37,0xB7,0x77,0xF7,
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0x0F,0x8F,0x4F,0xCF,0x2F,0xAF,0x6F,0xEF,0x1F,0x9F,0x5F,0xDF,0x3F,0xBF,0x7F,0xFF,
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};
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