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https://github.com/librempeg/librempeg
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18d7074b4e
Iterative implementation of 32 bit fixed point split-radix FFT. Max FFT that can be calculated currently is 2^12. Signed-off-by: Nedeljko Babic <nbabic@mips.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
201 lines
16 KiB
C
201 lines
16 KiB
C
/*
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* Copyright (c) 2012
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* MIPS Technologies, Inc., California.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Authors: Stanislav Ocovaj (socovaj@mips.com)
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* Goran Cordasic (goran@mips.com)
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* Djordje Pesut (djordje@mips.com)
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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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/**
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* @file
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* definitions and initialization of LUT table for FFT
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*/
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#include "libavcodec/fft_table.h"
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int32_t w_tab_sr[MAX_FFT_SIZE/(4*16)] = {
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2147483647, 2147481121, 2147473542, 2147460908, 2147443222, 2147420483, 2147392690, 2147359845,
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2147321946, 2147278995, 2147230991, 2147177934, 2147119825, 2147056664, 2146988450, 2146915184,
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2146836866, 2146753497, 2146665076, 2146571603, 2146473080, 2146369505, 2146260881, 2146147205,
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2146028480, 2145904705, 2145775880, 2145642006, 2145503083, 2145359112, 2145210092, 2145056025,
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2144896910, 2144732748, 2144563539, 2144389283, 2144209982, 2144025635, 2143836244, 2143641807,
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2143442326, 2143237802, 2143028234, 2142813624, 2142593971, 2142369276, 2142139541, 2141904764,
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2141664948, 2141420092, 2141170197, 2140915264, 2140655293, 2140390284, 2140120240, 2139845159,
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2139565043, 2139279892, 2138989708, 2138694490, 2138394240, 2138088958, 2137778644, 2137463301,
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2137142927, 2136817525, 2136487095, 2136151637, 2135811153, 2135465642, 2135115107, 2134759548,
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2134398966, 2134033361, 2133662734, 2133287087, 2132906420, 2132520734, 2132130030, 2131734309,
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2131333572, 2130927819, 2130517052, 2130101272, 2129680480, 2129254676, 2128823862, 2128388038,
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2127947206, 2127501367, 2127050522, 2126594672, 2126133817, 2125667960, 2125197100, 2124721240,
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2124240380, 2123754522, 2123263666, 2122767814, 2122266967, 2121761126, 2121250292, 2120734467,
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2120213651, 2119687847, 2119157054, 2118621275, 2118080511, 2117534762, 2116984031, 2116428319,
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2115867626, 2115301954, 2114731305, 2114155680, 2113575080, 2112989506, 2112398960, 2111803444,
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2111202959, 2110597505, 2109987085, 2109371700, 2108751352, 2108126041, 2107495770, 2106860540,
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2106220352, 2105575208, 2104925109, 2104270057, 2103610054, 2102945101, 2102275199, 2101600350,
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2100920556, 2100235819, 2099546139, 2098851519, 2098151960, 2097447464, 2096738032, 2096023667,
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2095304370, 2094580142, 2093850985, 2093116901, 2092377892, 2091633960, 2090885105, 2090131331,
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2089372638, 2088609029, 2087840505, 2087067068, 2086288720, 2085505463, 2084717298, 2083924228,
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2083126254, 2082323379, 2081515603, 2080702930, 2079885360, 2079062896, 2078235540, 2077403294,
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2076566160, 2075724139, 2074877233, 2074025446, 2073168777, 2072307231, 2071440808, 2070569511,
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2069693342, 2068812302, 2067926394, 2067035621, 2066139983, 2065239484, 2064334124, 2063423908,
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2062508835, 2061588910, 2060664133, 2059734508, 2058800036, 2057860719, 2056916560, 2055967560,
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2055013723, 2054055050, 2053091544, 2052123207, 2051150040, 2050172048, 2049189231, 2048201592,
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2047209133, 2046211857, 2045209767, 2044202863, 2043191150, 2042174628, 2041153301, 2040127172,
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2039096241, 2038060512, 2037019988, 2035974670, 2034924562, 2033869665, 2032809982, 2031745516,
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2030676269, 2029602243, 2028523442, 2027439867, 2026351522, 2025258408, 2024160529, 2023057887,
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2021950484, 2020838323, 2019721407, 2018599739, 2017473321, 2016342155, 2015206245, 2014065592,
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2012920201, 2011770073, 2010615210, 2009455617, 2008291295, 2007122248, 2005948478, 2004769987,
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2003586779, 2002398857, 2001206222, 2000008879, 1998806829, 1997600076, 1996388622, 1995172471,
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1993951625, 1992726087, 1991495860, 1990260946, 1989021350, 1987777073, 1986528118, 1985274489,
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1984016189, 1982753220, 1981485585, 1980213288, 1978936331, 1977654717, 1976368450, 1975077532,
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1973781967, 1972481757, 1971176906, 1969867417, 1968553292, 1967234535, 1965911148, 1964583136,
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1963250501, 1961913246, 1960571375, 1959224890, 1957873796, 1956518093, 1955157788, 1953792881,
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1952423377, 1951049279, 1949670589, 1948287312, 1946899451, 1945507008, 1944109987, 1942708392,
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1941302225, 1939891490, 1938476190, 1937056329, 1935631910, 1934202936, 1932769411, 1931331338,
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1929888720, 1928441561, 1926989864, 1925533633, 1924072871, 1922607581, 1921137767, 1919663432,
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1918184581, 1916701216, 1915213340, 1913720958, 1912224073, 1910722688, 1909216806, 1907706433,
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1906191570, 1904672222, 1903148392, 1901620084, 1900087301, 1898550047, 1897008325, 1895462140,
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1893911494, 1892356392, 1890796837, 1889232832, 1887664383, 1886091491, 1884514161, 1882932397,
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1881346202, 1879755580, 1878160535, 1876561070, 1874957189, 1873348897, 1871736196, 1870119091,
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1868497586, 1866871683, 1865241388, 1863606704, 1861967634, 1860324183, 1858676355, 1857024153,
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1855367581, 1853706643, 1852041343, 1850371686, 1848697674, 1847019312, 1845336604, 1843649553,
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1841958164, 1840262441, 1838562388, 1836858008, 1835149306, 1833436286, 1831718951, 1829997307,
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1828271356, 1826541103, 1824806552, 1823067707, 1821324572, 1819577151, 1817825449, 1816069469,
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1814309216, 1812544694, 1810775906, 1809002858, 1807225553, 1805443995, 1803658189, 1801868139,
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1800073849, 1798275323, 1796472565, 1794665580, 1792854372, 1791038946, 1789219305, 1787395453,
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1785567396, 1783735137, 1781898681, 1780058032, 1778213194, 1776364172, 1774510970, 1772653593,
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1770792044, 1768926328, 1767056450, 1765182414, 1763304224, 1761421885, 1759535401, 1757644777,
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1755750017, 1753851126, 1751948107, 1750040966, 1748129707, 1746214334, 1744294853, 1742371267,
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1740443581, 1738511799, 1736575927, 1734635968, 1732691928, 1730743810, 1728791620, 1726835361,
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1724875040, 1722910659, 1720942225, 1718969740, 1716993211, 1715012642, 1713028037, 1711039401,
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1709046739, 1707050055, 1705049355, 1703044642, 1701035922, 1699023199, 1697006479, 1694985765,
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1692961062, 1690932376, 1688899711, 1686863072, 1684822463, 1682777890, 1680729357, 1678676870,
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1676620432, 1674560049, 1672495725, 1670427466, 1668355276, 1666279161, 1664199124, 1662115172,
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1660027308, 1657935539, 1655839867, 1653740300, 1651636841, 1649529496, 1647418269, 1645303166,
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1643184191, 1641061349, 1638934646, 1636804087, 1634669676, 1632531418, 1630389319, 1628243383,
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1626093616, 1623940023, 1621782608, 1619621377, 1617456335, 1615287487, 1613114838, 1610938393,
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1608758157, 1606574136, 1604386335, 1602194758, 1599999411, 1597800299, 1595597428, 1593390801,
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1591180426, 1588966306, 1586748447, 1584526854, 1582301533, 1580072489, 1577839726, 1575603251,
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1573363068, 1571119183, 1568871601, 1566620327, 1564365367, 1562106725, 1559844408, 1557578421,
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1555308768, 1553035455, 1550758488, 1548477872, 1546193612, 1543905714, 1541614183, 1539319024,
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1537020244, 1534717846, 1532411837, 1530102222, 1527789007, 1525472197, 1523151797, 1520827813,
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1518500250, 1516169114, 1513834411, 1511496145, 1509154322, 1506808949, 1504460029, 1502107570,
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1499751576, 1497392053, 1495029006, 1492662441, 1490292364, 1487918781, 1485541696, 1483161115,
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1480777044, 1478389489, 1475998456, 1473603949, 1471205974, 1468804538, 1466399645, 1463991302,
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1461579514, 1459164286, 1456745625, 1454323536, 1451898025, 1449469098, 1447036760, 1444601017,
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1442161874, 1439719338, 1437273414, 1434824109, 1432371426, 1429915374, 1427455956, 1424993180,
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1422527051, 1420057574, 1417584755, 1415108601, 1412629117, 1410146309, 1407660183, 1405170745,
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1402678000, 1400181954, 1397682613, 1395179984, 1392674072, 1390164882, 1387652422, 1385136696,
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1382617710, 1380095472, 1377569986, 1375041258, 1372509294, 1369974101, 1367435685, 1364894050,
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1362349204, 1359801152, 1357249901, 1354695455, 1352137822, 1349577007, 1347013017, 1344445857,
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1341875533, 1339302052, 1336725419, 1334145641, 1331562723, 1328976672, 1326387494, 1323795195,
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1321199781, 1318601257, 1315999631, 1313394909, 1310787095, 1308176198, 1305562222, 1302945174,
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1300325060, 1297701886, 1295075659, 1292446384, 1289814068, 1287178717, 1284540337, 1281898935,
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1279254516, 1276607086, 1273956653, 1271303222, 1268646800, 1265987392, 1263325005, 1260659646,
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1257991320, 1255320034, 1252645794, 1249968606, 1247288478, 1244605414, 1241919421, 1239230506,
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1236538675, 1233843935, 1231146291, 1228445750, 1225742318, 1223036002, 1220326809, 1217614743,
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1214899813, 1212182024, 1209461382, 1206737894, 1204011567, 1201282407, 1198550419, 1195815612,
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1193077991, 1190337562, 1187594332, 1184848308, 1182099496, 1179347902, 1176593533, 1173836395,
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1171076495, 1168313840, 1165548435, 1162780288, 1160009405, 1157235792, 1154459456, 1151680403,
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1148898640, 1146114174, 1143327011, 1140537158, 1137744621, 1134949406, 1132151521, 1129350972,
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1126547765, 1123741908, 1120933406, 1118122267, 1115308496, 1112492101, 1109673089, 1106851465,
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1104027237, 1101200410, 1098370993, 1095538991, 1092704411, 1089867259, 1087027544, 1084185270,
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1081340445, 1078493076, 1075643169, 1072790730, 1069935768, 1067078288, 1064218296, 1061355801,
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1058490808, 1055623324, 1052753357, 1049880912, 1047005996, 1044128617, 1041248781, 1038366495,
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1035481766, 1032594600, 1029705004, 1026812985, 1023918550, 1021021705, 1018122458, 1015220816,
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1012316784, 1009410370, 1006501581, 1003590424, 1000676905, 997761031, 994842810, 991922248,
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988999351, 986074127, 983146583, 980216726, 977284562, 974350098, 971413342, 968474300,
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965532978, 962589385, 959643527, 956695411, 953745043, 950792431, 947837582, 944880503,
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941921200, 938959681, 935995952, 933030021, 930061894, 927091579, 924119082, 921144411,
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918167572, 915188572, 912207419, 909224120, 906238681, 903251110, 900261413, 897269597,
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894275671, 891279640, 888281512, 885281293, 882278992, 879274614, 876268167, 873259659,
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870249095, 867236484, 864221832, 861205147, 858186435, 855165703, 852142959, 849118210,
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846091463, 843062726, 840032004, 836999305, 833964638, 830928007, 827889422, 824848888,
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821806413, 818762005, 815715670, 812667415, 809617249, 806565177, 803511207, 800455346,
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797397602, 794337982, 791276492, 788213141, 785147934, 782080880, 779011986, 775941259,
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772868706, 769794334, 766718151, 763640164, 760560380, 757478806, 754395449, 751310318,
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748223418, 745134758, 742044345, 738952186, 735858287, 732762657, 729665303, 726566232,
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723465451, 720362968, 717258790, 714152924, 711045377, 707936158, 704825272, 701712728,
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698598533, 695482694, 692365218, 689246113, 686125387, 683003045, 679879097, 676753549,
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673626408, 670497682, 667367379, 664235505, 661102068, 657967075, 654830535, 651692453,
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648552838, 645411696, 642269036, 639124865, 635979190, 632832018, 629683357, 626533215,
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623381598, 620228514, 617073971, 613917975, 610760536, 607601658, 604441352, 601279623,
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598116479, 594951927, 591785976, 588618632, 585449903, 582279796, 579108320, 575935480,
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572761285, 569585743, 566408860, 563230645, 560051104, 556870245, 553688076, 550504604,
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547319836, 544133781, 540946445, 537757837, 534567963, 531376831, 528184449, 524990824,
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521795963, 518599875, 515402566, 512204045, 509004318, 505803394, 502601279, 499397982,
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496193509, 492987869, 489781069, 486573117, 483364019, 480153784, 476942419, 473729932,
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470516330, 467301622, 464085813, 460868912, 457650927, 454431865, 451211734, 447990541,
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444768294, 441545000, 438320667, 435095303, 431868915, 428641511, 425413098, 422183684,
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418953276, 415721883, 412489512, 409256170, 406021865, 402786604, 399550396, 396313247,
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393075166, 389836160, 386596237, 383355404, 380113669, 376871039, 373627523, 370383128,
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367137861, 363891730, 360644742, 357396906, 354148230, 350898719, 347648383, 344397230,
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341145265, 337892498, 334638936, 331384586, 328129457, 324873555, 321616889, 318359466,
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315101295, 311842381, 308582734, 305322361, 302061269, 298799466, 295536961, 292273760,
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289009871, 285745302, 282480061, 279214155, 275947592, 272680379, 269412525, 266144038,
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262874923, 259605191, 256334847, 253063900, 249792358, 246520228, 243247518, 239974235,
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236700388, 233425984, 230151030, 226875535, 223599506, 220322951, 217045878, 213768293,
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210490206, 207211624, 203932553, 200653003, 197372981, 194092495, 190811551, 187530159,
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184248325, 180966058, 177683365, 174400254, 171116733, 167832808, 164548489, 161263783,
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157978697, 154693240, 151407418, 148121241, 144834714, 141547847, 138260647, 134973122,
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131685278, 128397125, 125108670, 121819921, 118530885, 115241570, 111951983, 108662134,
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105372028, 102081675, 98791081, 95500255, 92209205, 88917937, 85626460, 82334782,
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79042909, 75750851, 72458615, 69166208, 65873638, 62580914, 59288042, 55995030,
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52701887, 49408620, 46115236, 42821744, 39528151, 36234466, 32940695, 29646846,
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26352928, 23058947, 19764913, 16470832, 13176712, 9882561, 6588387, 3294197
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};
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uint16_t fft_offsets_lut[0x2aab];
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void ff_fft_lut_init(uint16_t *table, int off, int size, int *index)
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{
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if (size < 16) {
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table[*index] = off >> 2;
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(*index)++;
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}
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else {
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ff_fft_lut_init(table, off, size>>1, index);
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ff_fft_lut_init(table, off+(size>>1), size>>2, index);
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ff_fft_lut_init(table, off+3*(size>>2), size>>2, index);
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}
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}
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