/* Copyright (c) 2005-2009, The Musepack Development Team All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the The Musepack Development Team nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /// \file requant.c /// Requantization function implementations. /// \todo document me #include "mpcdec.h" #include "requant.h" #include "mpcdec_math.h" #include "decoder.h" #include "internal.h" #include /* C O N S T A N T S */ // Bits per sample for chosen quantizer const mpc_uint8_t Res_bit [18] ICONST_ATTR = { 0, 0, 0, 0, 0, 0, 0, 0, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; // Requantization coefficients // 65536/step bzw. 65536/(2*D+1) #define _(X) MAKE_MPC_SAMPLE_EX(X,14) const MPC_SAMPLE_FORMAT __Cc [1 + 18] ICONST_ATTR = { _(111.285962475327f), // 32768/2/255*sqrt(3) _(65536.000000000000f), _(21845.333333333332f), _(13107.200000000001f), _(9362.285714285713f), _(7281.777777777777f), _(4369.066666666666f), _(2114.064516129032f), _(1040.253968253968f), _(516.031496062992f), _(257.003921568627f), _(128.250489236790f), _(64.062561094819f), _(32.015632633121f), _(16.003907203907f), _(8.000976681723f), _(4.000244155527f), _(2.000061037018f), _(1.000015259021f) }; #undef _ // Requantization offset // 2*D+1 = steps of quantizer const mpc_int16_t __Dc [1 + 18] ICONST_ATTR = { 2, 0, 1, 2, 3, 4, 7, 15, 31, 63, 127, 255, 511, 1023, 2047, 4095, 8191, 16383, 32767 }; // Table'ized SCF calculated from mpc_decoder_scale_output(d, 1.0) static const mpc_uint32_t SCF[] = { 1289035711, 1073741824, 1788812356, 1490046106, 1241179595, 1033878604, 861200887, 717363687, 597550081, 497747664, 414614180, 345365595, 287682863, 239634262, 199610707, 166271859, 138501244, 115368858, 96100028, 80049465, 66679657, 55542865, 46266132, 38538793, 32102070, 26740403, 22274239, 18554010, 15455132, 12873826, 10723648, 8932591, 7440676, 6197939, 5162763, 4300482, 3582218, 2983918, 2485546, 2070412, 1724613, 1436569, 1196634, 996773, 830293, 691618, 576104, 479883, 399734, 332970, 277358, 231034, 192446, 160304, 133530, 111228, 92651, 77176, 64286, 53549, 44605, 37155, 30949, 25780, 21474, 17888, 14900, 12411, 10338, 8612, 7173, 5975, 4977, 4146, 3453, 2876, 2396, 1996, 1662, 1385, 1153, 961, 800, 666, 555, 462, 385, 321, 267, 222, 185, 154, 128, 107, 89, 74, 61, 51, 43, 35, 29, 24, 20, 17, 14, 11, 9, 8, 6, 5, 4, 3, 3, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2147483648, 2147483648, 2147483648, 2147483648, 2147483648, 2147483648, 2147483648, 2147483648, 2147483648, 2147483648, 2147483648, 1930697728, 1608233877, 1339627724, 1115883992, 1859019579, 1548527365, 1289893354, 1074456223, 1790002518, 1491037488, 1242005398, 2069132964, 1723547752, 1435681952, 1195895306, 1992315335, 1659560152, 1382381519, 1151497076, 1918349601, 1597948125, 1331059892, 1108747153, 1847129882, 1538623477, 1281643607, 2135168687, 1778554232, 1481501287, 1234061927, 2055899448, 1712524489, 1426499787, 1188246741, 1979573121, 1648946134, 1373540247, 1144132468, 1906080447, 1587728158, 1322546856, 1101655960, 1835316227, 1528782931, 1273446622, 2121512828, 1767179166, 1472026076, 1226169259, 2042750570, 1701571728, 1417376349, 1180647093, 1966912401, 1638400000, 1364755521, 1136814961, 1893889764, 1577573554, 1314088268, 1094610119, 1823578129, 1519005322, 1265302063, 2107944308, 1755876851, 1462611466, 1218327071, 2029685788, 1690689017, 1408311261, 1173096050, 1954332656, 1627921315, 1356026979, 1129544254, 1881777048, 1567483896, 1305683778, 1087609341, 1811915104, 1509290248, 1257209594, 2094462567, 1744646821, 1453257069, 1210535039, 2016704564, 1679875908, 1399304151, 1165593302, 1941833367, 1617509648, 1347354262, 1122320049, 1869741801, 1557458768, 1297333040, 1080653338, 1800326672, 1499637308, 1249168882, 2081067051, 1733488616, 1443962500, 1202792843, 2003806364, 1669131957, 1390354647, 1158138538, 1929414019, 1607164572, 1338737013, 1115142047, 1857783528, 1547497758 }; // Table'ized SCF_shift calculated from mpc_decoder_scale_output(d, 1.0) static const mpc_uint8_t SCF_shift[] = { 30, 30, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, 24, 24, 24, 24, 25, 25, 25, 25, 26, 26, 26, 27, 27, 27, 27, 28, 28, 28, 28, 29, 29, 29, 29, 30, 30 }; /* F U N C T I O N S */ /* not used anymore, tables from above are used #ifdef MPC_FIXED_POINT static mpc_uint32_t find_shift(double fval) { mpc_int64_t val = (mpc_int64_t) fval; mpc_uint32_t ptr = 0; if(val<0) val = -val; while(val) { val >>= 1; ptr++; } return ptr > 31 ? 0 : 31 - ptr; } #endif #define SET_SCF(N,X) d->SCF[N] = MAKE_MPC_SAMPLE_EX(X,d->SCF_shift[N] = (mpc_uint8_t) find_shift(X)); static void mpc_decoder_scale_output(mpc_decoder *d, double factor) { mpc_int32_t n; double f1, f2; #ifndef MPC_FIXED_POINT factor *= 1.0 / (double) (1<<(MPC_FIXED_POINT_SHIFT-1)); #else factor *= 1.0 / (double) (1<<(16-MPC_FIXED_POINT_SHIFT)); #endif f1 = f2 = factor; // handles +1.58...-98.41 dB, where's scf[n] / scf[n-1] = 1.20050805774840750476 SET_SCF(1,factor); f1 *= 0.83298066476582673961; f2 *= 1/0.83298066476582673961; for ( n = 1; n <= 128; n++ ) { SET_SCF((mpc_uint8_t)(1+n),f1); SET_SCF((mpc_uint8_t)(1-n),f2); f1 *= 0.83298066476582673961; f2 *= 1/0.83298066476582673961; } } */ void mpc_decoder_init_quant(mpc_decoder *d, MPC_SAMPLE_FORMAT factor) { //mpc_decoder_scale_output(d, (double)factor / MPC_FIXED_POINT_SHIFT) (void)factor; memcpy(d->SCF, SCF, sizeof(d->SCF)); memcpy(d->SCF_shift, SCF_shift, sizeof(d->SCF_shift)); }