l3table.cpp

MP3解压程序源代码

/*
 *  l3table.cpp
 *
 *  Contains tables for MPEG Audio Layer III decoding
 *
 *  Last modified : 08/02/97
 */

#include "all.h"
#include "l3table.h"

#ifdef __WIN32__
#pragma warning (disable: 4305)
#endif

extern int32 slen[2][16] =
{
 {0, 0, 0, 0, 3, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4},
 {0, 1, 2, 3, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3, 2, 3}
};

extern int32 pretab[22] =
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 3, 2, 0};


extern struct SBI sfBandIndex[6] =
{
 {{0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576},
  {0,4,8,12,18,24,32,42,56,74,100,132,174,192}},
 {{0,6,12,18,24,30,36,44,54,66,80,96,114,136,162,194,232,278,330,394,464,540,576},
  {0,4,8,12,18,26,36,48,62,80,104,136,180,192}},
 {{0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576},
  {0,4,8,12,18,26,36,48,62,80,104,134,174,192}},

 {{0,4,8,12,16,20,24,30,36,44,52,62,74,90,110,134,162,196,238,288,342,418,576},
  {0,4,8,12,16,22,30,40,52,66,84,106,136,192}},
 {{0,4,8,12,16,20,24,30,36,42,50,60,72,88,106,128,156,190,230,276,330,384,576},
  {0,4,8,12,16,22,28,38,50,64,80,100,126,192}},
 {{0,4,8,12,16,20,24,30,36,44,54,66,82,102,126,156,194,240,296,364,448,550,576},
  {0,4,8,12,16,22,30,42,58,78,104,138,180,192}}
};

extern real two_to_negative_half_pow[64] =
{ 1.0000000000E+00f, 7.0710678119E-01f, 5.0000000000E-01f, 3.5355339059E-01f,
  2.5000000000E-01f, 1.7677669530E-01f, 1.2500000000E-01f, 8.8388347648E-02f,
  6.2500000000E-02f, 4.4194173824E-02f, 3.1250000000E-02f, 2.2097086912E-02f,
  1.5625000000E-02f, 1.1048543456E-02f, 7.8125000000E-03f, 5.5242717280E-03f,
  3.9062500000E-03f, 2.7621358640E-03f, 1.9531250000E-03f, 1.3810679320E-03f,
  9.7656250000E-04f, 6.9053396600E-04f, 4.8828125000E-04f, 3.4526698300E-04f,
  2.4414062500E-04f, 1.7263349150E-04f, 1.2207031250E-04f, 8.6316745750E-05f,
  6.1035156250E-05f, 4.3158372875E-05f, 3.0517578125E-05f, 2.1579186438E-05f,
  1.5258789062E-05f, 1.0789593219E-05f, 7.6293945312E-06f, 5.3947966094E-06f,
  3.8146972656E-06f, 2.6973983047E-06f, 1.9073486328E-06f, 1.3486991523E-06f,
  9.5367431641E-07f, 6.7434957617E-07f, 4.7683715820E-07f, 3.3717478809E-07f,
  2.3841857910E-07f, 1.6858739404E-07f, 1.1920928955E-07f, 8.4293697022E-08f,
  5.9604644775E-08f, 4.2146848511E-08f, 2.9802322388E-08f, 2.1073424255E-08f,
  1.4901161194E-08f, 1.0536712128E-08f, 7.4505805969E-09f, 5.2683560639E-09f,
  3.7252902985E-09f, 2.6341780319E-09f, 1.8626451492E-09f, 1.3170890160E-09f,
  9.3132257462E-10f, 6.5854450798E-10f, 4.6566128731E-10f, 3.2927225399E-10f
};

extern real  t_43[8192] =
{
    0.000000,    1.000000,    2.519842,    4.326749,    6.349604,    8.549880,   10.902724,   13.390518,
   16.000000,   18.720754,   21.544347,   24.463781,   27.473142,   30.567351,   33.741992,   36.993181,
   40.317474,   43.711787,   47.173345,   50.699631,   54.288352,   57.937408,   61.644865,   65.408941,
   69.227979,   73.100443,   77.024898,   81.000000,   85.024491,   89.097188,   93.216975,   97.382800,
  101.593667,  105.848633,  110.146801,  114.487321,  118.869381,  123.292209,  127.755065,  132.257246,
  136.798076,  141.376907,  145.993119,  150.646117,  155.335327,  160.060199,  164.820202,  169.614826,
  174.443577,  179.305980,  184.201575,  189.129918,  194.090580,  199.083145,  204.107210,  209.162385,
  214.248292,  219.364564,  224.510845,  229.686789,  234.892058,  240.126328,  245.389280,  250.680604,
  256.000000,  261.347174,  266.721841,  272.123723,  277.552547,  283.008049,  288.489971,  293.998060,
  299.532071,  305.091761,  310.676898,  316.287249,  321.922592,  327.582707,  333.267377,  338.976394,
  344.709550,  350.466646,  356.247482,  362.051866,  367.879608,  373.730522,  379.604427,  385.501143,
  391.420496,  397.362314,  403.326427,  409.312672,  415.320884,  421.350905,  427.402579,  433.475750,
  439.570269,  445.685987,  451.822757,  457.980436,  464.158883,  470.357960,  476.577530,  482.817459,
  489.077615,  495.357868,  501.658090,  507.978156,  514.317941,  520.677324,  527.056184,  533.454404,
  539.871867,  546.308458,  552.764065,  559.238575,  565.731879,  572.243870,  578.774440,  585.323483,
  591.890898,  598.476581,  605.080431,  611.702349,  618.342238,  625.000000,  631.675540,  638.368763,
  645.079578,  651.807891,  658.553612,  665.316653,  672.096925,  678.894340,  685.708813,  692.540258,
  699.388593,  706.253733,  713.135597,  720.034104,  726.949174,  733.880729,  740.828689,  747.792979,
  754.773522,  761.770242,  768.783065,  775.811917,  782.856726,  789.917420,  796.993927,  804.086177,
  811.194101,  818.317630,  825.456695,  832.611230,  839.781167,  846.966442,  854.166988,  861.382741,
  868.613637,  875.859614,  883.120608,  890.396558,  897.687403,  904.993081,  912.313534,  919.648701,
  926.998523,  934.362944,  941.741904,  949.135347,  956.543216,  963.965455,  971.402010,  978.852824,
  986.317844,  993.797016, 1001.290286, 1008.797602, 1016.318911, 1023.854161, 1031.403302, 1038.966281,
 1046.543049, 1054.133555, 1061.737750, 1069.355585, 1076.987011, 1084.631981, 1092.290445, 1099.962357,
 1107.647670, 1115.346337, 1123.058312, 1130.783550, 1138.522004, 1146.273630, 1154.038383, 1161.816220,
 1169.607095, 1177.410967, 1185.227790, 1193.057524, 1200.900125, 1208.755551, 1216.623760, 1224.504712,
 1232.398364, 1240.304677, 1248.223610, 1256.155123, 1264.099175, 1272.055728, 1280.024742, 1288.006179,
 1296.000000, 1304.006166, 1312.024641, 1320.055385, 1328.098362, 1336.153535, 1344.220866, 1352.300320,
 1360.391859, 1368.495449, 1376.611053, 1384.738635, 1392.878162, 1401.029597, 1409.192905, 1417.368054,
 1425.555007, 1433.753732, 1441.964195, 1450.186361, 1458.420199, 1466.665675, 1474.922755, 1483.191409,
 1491.471603, 1499.763305, 1508.066484, 1516.381107, 1524.707144, 1533.044563, 1541.393333, 1549.753423,
 1558.124804, 1566.507443, 1574.901312, 1583.306381, 1591.722619, 1600.149996, 1608.588485, 1617.038055,
 1625.498677, 1633.970323, 1642.452964, 1650.946572, 1659.451118, 1667.966574, 1676.492913, 1685.030106,
 1693.578126, 1702.136946, 1710.706539, 1719.286878, 1727.877935, 1736.479684, 1745.092099, 1753.715153,
 1762.348820, 1770.993074, 1779.647889, 1788.313239, 1796.989100, 1805.675444, 1814.372248, 1823.079487,
 1831.797134, 1840.525165, 1849.263556, 1858.012283, 1866.771320, 1875.540644, 1884.320231, 1893.110056,
 1901.910095, 1910.720326, 1919.540725, 1928.371268, 1937.211932, 1946.062693, 1954.923530, 1963.794418,
 1972.675336, 1981.566261, 1990.467169, 1999.378040, 2008.298850, 2017.229578, 2026.170201, 2035.120698,
 2044.081047, 2053.051227, 2062.031215, 2071.020990, 2080.020532, 2089.029819, 2098.048830, 2107.077544,
 2116.115940, 2125.163998, 2134.221697, 2143.289017, 2152.365936, 2161.452435, 2170.548495, 2179.654093,
 2188.769212, 2197.893830, 2207.027929, 2216.171488, 2225.324488, 2234.486909, 2243.658733, 2252.839939,
 2262.030510, 2271.230425, 2280.439666, 2289.658214, 2298.886050, 2308.123156, 2317.369513, 2326.625102,
 2335.889905, 2345.163905, 2354.447082, 2363.739418, 2373.040896, 2382.351497, 2391.671205, 2401.000000,
 2410.337866, 2419.684784, 2429.040737, 2438.405709, 2447.779680, 2457.162635, 2466.554556, 2475.955426,
 2485.365228, 2494.783945, 2504.211560, 2513.648057, 2523.093418, 2532.547627, 2542.010668, 2551.482524,
 2560.963179, 2570.452617, 2579.950820, 2589.457774, 2598.973461, 2608.497867, 2618.030975, 2627.572769,
 2637.123233, 2646.682352, 2656.250110, 2665.826492, 2675.411482, 2685.005064, 2694.607223, 2704.217944,
 2713.837212, 2723.465012, 2733.101328, 2742.746145, 2752.399449, 2762.061224, 2771.731456, 2781.410129,
 2791.097231, 2800.792744, 2810.496656, 2820.208951, 2829.929616, 2839.658635, 2849.395994, 2859.141679,
 2868.895677, 2878.657972, 2888.428550, 2898.207399, 2907.994503, 2917.789849, 2927.593423, 2937.405211,
 2947.225199, 2957.053374, 2966.889722, 2976.734230, 2986.586884, 2996.447670, 3006.316576, 3016.193588,
 3026.078692, 3035.971875, 3045.873125, 3055.782428, 3065.699771, 3075.625140, 3085.558524, 3095.499909,
 3105.449282, 3115.406631, 3125.371943, 3135.345204, 3145.326403, 3155.315526, 3165.312562, 3175.317497,
 3185.330320, 3195.351017, 3205.379577, 3215.415987, 3225.460235, 3235.512308, 3245.572195, 3255.639884,
 3265.715361, 3275.798616, 3285.889637, 3295.988410, 3306.094926, 3316.209171, 3326.331133, 3336.460802,
 3346.598165, 3356.743211, 3366.895929, 3377.056305, 3387.224330, 3397.399991, 3407.583277, 3417.774177,
 3427.972680, 3438.178773, 3448.392446, 3458.613687, 3468.842486, 3479.078831, 3489.322711, 3499.574115,
 3509.833032, 3520.099451, 3530.373360, 3540.654750, 3550.943609, 3561.239927, 3571.543692, 3581.854894,
 3592.173522, 3602.499566, 3612.833015, 3623.173857, 3633.522084, 3643.877683, 3654.240646, 3664.610960,
 3674.988617, 3685.373604, 3695.765913, 3706.165533, 3716.572453, 3726.986664, 3737.408154, 3747.836915,
 3758.272936, 3768.716206, 3779.166716, 3789.624455, 3800.089415, 3810.561584, 3821.040953, 3831.527512,
 3842.021251, 3852.522160, 3863.030230, 3873.545451, 3884.067812, 3894.597305, 3905.133920, 3915.677647,
 3926.228477, 3936.786399, 3947.351405, 3957.923485, 3968.502630, 3979.088830, 3989.682075, 4000.282357,
 4010.889666, 4021.503992, 4032.125327, 4042.753661, 4053.388986, 4064.031291, 4074.680568, 4085.336807,
 4096.000000, 4106.670137, 4117.347210, 4128.031209, 4138.722126, 4149.419951, 4160.124676, 4170.836292,
 4181.554789, 4192.280159, 4203.012394, 4213.751484, 4224.497421, 4235.250196, 4246.009800, 4256.776225,
 4267.549462, 4278.329502, 4289.116337, 4299.909959, 4310.710358, 4321.517527, 4332.331456, 4343.152138,
 4353.979564, 4364.813725, 4375.654614, 4386.502221, 4397.356539, 4408.217559, 4419.085273, 4429.959673,
 4440.840751, 4451.728498, 4462.622906, 4473.523967, 4484.431673, 4495.346016, 4506.266988, 4517.194581,
 4528.128786, 4539.069597, 4550.017004, 4560.970999, 4571.931576, 4582.898726, 4593.872441, 4604.852714,