📄 sublay2.cpp
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/* sublay2.cpp Layer II subband object implementation, now with MPEG-2 LSF support *//* * @(#) subband_layer_2.cc 1.8, last edit: 6/15/94 16:51:50 * @(#) Copyright (C) 1993, 1994 Tobias Bading (bading@cs.tu-berlin.de) * @(#) Berlin University of Technology * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *//* * Changes from version 1.1 to 1.2: * - calculation of the 3 samples contained in one groupcode is now done * through lookup tables, no more integer modulo or division required. * table_*_quantizationsteps[] arrays replaced by * table_*_groupingtables[] arrays * - scalefactors itself instead of scalefactor indices are stored in * SubbandLayer2... objects * - check for small values in [-1.0E-7, 1.0E-7] removed, because the * test itself was slower than some SynthesisFilter::input_sample() calls * - check for illegal scalefactor index 63 removed */#include "sublay2.h"#include "scalfact.h"
#ifdef __WIN32__
#pragma warning (disable: 4305 4244)
#endif
static const real grouping_5bits[27 * 3] =// this table contains 3 requantized samples for each legal codeword// when grouped in 5 bits, i.e. 3 quantizationsteps per sample{ -2.0/3.0, -2.0/3.0, -2.0/3.0, 0.0, -2.0/3.0, -2.0/3.0, 2.0/3.0, -2.0/3.0, -2.0/3.0, -2.0/3.0, 0.0, -2.0/3.0, 0.0, 0.0, -2.0/3.0, 2.0/3.0, 0.0, -2.0/3.0, -2.0/3.0, 2.0/3.0, -2.0/3.0, 0.0, 2.0/3.0, -2.0/3.0, 2.0/3.0, 2.0/3.0, -2.0/3.0, -2.0/3.0, -2.0/3.0, 0.0, 0.0, -2.0/3.0, 0.0, 2.0/3.0, -2.0/3.0, 0.0, -2.0/3.0, 0.0, 0.0, 0.0, 0.0, 0.0, 2.0/3.0, 0.0, 0.0, -2.0/3.0, 2.0/3.0, 0.0, 0.0, 2.0/3.0, 0.0, 2.0/3.0, 2.0/3.0, 0.0, -2.0/3.0, -2.0/3.0, 2.0/3.0, 0.0, -2.0/3.0, 2.0/3.0, 2.0/3.0, -2.0/3.0, 2.0/3.0, -2.0/3.0, 0.0, 2.0/3.0, 0.0, 0.0, 2.0/3.0, 2.0/3.0, 0.0, 2.0/3.0, -2.0/3.0, 2.0/3.0, 2.0/3.0, 0.0, 2.0/3.0, 2.0/3.0, 2.0/3.0, 2.0/3.0, 2.0/3.0};static const real grouping_7bits[125 * 3] =// this table contains 3 requantized samples for each legal codeword// when grouped in 7 bits, i.e. 5 quantizationsteps per sample{ -0.8, -0.8, -0.8, -0.4, -0.8, -0.8, 0.0, -0.8, -0.8, 0.4, -0.8, -0.8, 0.8, -0.8, -0.8, -0.8, -0.4, -0.8, -0.4, -0.4, -0.8, 0.0, -0.4, -0.8, 0.4, -0.4, -0.8, 0.8, -0.4, -0.8, -0.8, 0.0, -0.8, -0.4, 0.0, -0.8, 0.0, 0.0, -0.8, 0.4, 0.0, -0.8, 0.8, 0.0, -0.8, -0.8, 0.4, -0.8, -0.4, 0.4, -0.8, 0.0, 0.4, -0.8, 0.4, 0.4, -0.8, 0.8, 0.4, -0.8, -0.8, 0.8, -0.8, -0.4, 0.8, -0.8, 0.0, 0.8, -0.8, 0.4, 0.8, -0.8, 0.8, 0.8, -0.8, -0.8, -0.8, -0.4, -0.4, -0.8, -0.4, 0.0, -0.8, -0.4, 0.4, -0.8, -0.4, 0.8, -0.8, -0.4, -0.8, -0.4, -0.4, -0.4, -0.4, -0.4, 0.0, -0.4, -0.4, 0.4, -0.4, -0.4, 0.8, -0.4, -0.4, -0.8, 0.0, -0.4, -0.4, 0.0, -0.4, 0.0, 0.0, -0.4, 0.4, 0.0, -0.4, 0.8, 0.0, -0.4, -0.8, 0.4, -0.4, -0.4, 0.4, -0.4, 0.0, 0.4, -0.4, 0.4, 0.4, -0.4, 0.8, 0.4, -0.4, -0.8, 0.8, -0.4, -0.4, 0.8, -0.4, 0.0, 0.8, -0.4, 0.4, 0.8, -0.4, 0.8, 0.8, -0.4, -0.8, -0.8, 0.0, -0.4, -0.8, 0.0, 0.0, -0.8, 0.0, 0.4, -0.8, 0.0, 0.8, -0.8, 0.0, -0.8, -0.4, 0.0, -0.4, -0.4, 0.0, 0.0, -0.4, 0.0, 0.4, -0.4, 0.0, 0.8, -0.4, 0.0, -0.8, 0.0, 0.0, -0.4, 0.0, 0.0, 0.0, 0.0, 0.0, 0.4, 0.0, 0.0, 0.8, 0.0, 0.0, -0.8, 0.4, 0.0, -0.4, 0.4, 0.0, 0.0, 0.4, 0.0, 0.4, 0.4, 0.0, 0.8, 0.4, 0.0, -0.8, 0.8, 0.0, -0.4, 0.8, 0.0, 0.0, 0.8, 0.0, 0.4, 0.8, 0.0, 0.8, 0.8, 0.0, -0.8, -0.8, 0.4, -0.4, -0.8, 0.4, 0.0, -0.8, 0.4, 0.4, -0.8, 0.4, 0.8, -0.8, 0.4, -0.8, -0.4, 0.4, -0.4, -0.4, 0.4, 0.0, -0.4, 0.4, 0.4, -0.4, 0.4, 0.8, -0.4, 0.4, -0.8, 0.0, 0.4, -0.4, 0.0, 0.4, 0.0, 0.0, 0.4, 0.4, 0.0, 0.4, 0.8, 0.0, 0.4, -0.8, 0.4, 0.4, -0.4, 0.4, 0.4, 0.0, 0.4, 0.4, 0.4, 0.4, 0.4, 0.8, 0.4, 0.4, -0.8, 0.8, 0.4, -0.4, 0.8, 0.4, 0.0, 0.8, 0.4, 0.4, 0.8, 0.4, 0.8, 0.8, 0.4, -0.8, -0.8, 0.8, -0.4, -0.8, 0.8, 0.0, -0.8, 0.8, 0.4, -0.8, 0.8, 0.8, -0.8, 0.8, -0.8, -0.4, 0.8, -0.4, -0.4, 0.8, 0.0, -0.4, 0.8, 0.4, -0.4, 0.8, 0.8, -0.4, 0.8, -0.8, 0.0, 0.8, -0.4, 0.0, 0.8, 0.0, 0.0, 0.8, 0.4, 0.0, 0.8, 0.8, 0.0, 0.8, -0.8, 0.4, 0.8, -0.4, 0.4, 0.8, 0.0, 0.4, 0.8, 0.4, 0.4, 0.8, 0.8, 0.4, 0.8, -0.8, 0.8, 0.8, -0.4, 0.8, 0.8, 0.0, 0.8, 0.8, 0.4, 0.8, 0.8, 0.8, 0.8, 0.8};static const real grouping_10bits[729 * 3] =// this table contains 3 requantized samples for each legal codeword// when grouped in 10 bits, i.e. 9 quantizationsteps per sample{ -8.0/9.0, -8.0/9.0, -8.0/9.0, -6.0/9.0, -8.0/9.0, -8.0/9.0, -4.0/9.0, -8.0/9.0, -8.0/9.0, -2.0/9.0, -8.0/9.0, -8.0/9.0, 0.0, -8.0/9.0, -8.0/9.0, 2.0/9.0, -8.0/9.0, -8.0/9.0, 4.0/9.0, -8.0/9.0, -8.0/9.0, 6.0/9.0, -8.0/9.0, -8.0/9.0, 8.0/9.0, -8.0/9.0, -8.0/9.0, -8.0/9.0, -6.0/9.0, -8.0/9.0, -6.0/9.0, -6.0/9.0, -8.0/9.0, -4.0/9.0, -6.0/9.0, -8.0/9.0, -2.0/9.0, -6.0/9.0, -8.0/9.0, 0.0, -6.0/9.0, -8.0/9.0, 2.0/9.0, -6.0/9.0, -8.0/9.0, 4.0/9.0, -6.0/9.0, -8.0/9.0, 6.0/9.0, -6.0/9.0, -8.0/9.0, 8.0/9.0, -6.0/9.0, -8.0/9.0, -8.0/9.0, -4.0/9.0, -8.0/9.0, -6.0/9.0, -4.0/9.0, -8.0/9.0, -4.0/9.0, -4.0/9.0, -8.0/9.0, -2.0/9.0, -4.0/9.0, -8.0/9.0, 0.0, -4.0/9.0, -8.0/9.0, 2.0/9.0, -4.0/9.0, -8.0/9.0, 4.0/9.0, -4.0/9.0, -8.0/9.0, 6.0/9.0, -4.0/9.0, -8.0/9.0, 8.0/9.0, -4.0/9.0, -8.0/9.0, -8.0/9.0, -2.0/9.0, -8.0/9.0, -6.0/9.0, -2.0/9.0, -8.0/9.0, -4.0/9.0, -2.0/9.0, -8.0/9.0, -2.0/9.0, -2.0/9.0, -8.0/9.0, 0.0, -2.0/9.0, -8.0/9.0, 2.0/9.0, -2.0/9.0, -8.0/9.0, 4.0/9.0, -2.0/9.0, -8.0/9.0, 6.0/9.0, -2.0/9.0, -8.0/9.0, 8.0/9.0, -2.0/9.0, -8.0/9.0, -8.0/9.0, 0.0, -8.0/9.0, -6.0/9.0, 0.0, -8.0/9.0, -4.0/9.0, 0.0, -8.0/9.0, -2.0/9.0, 0.0, -8.0/9.0, 0.0, 0.0, -8.0/9.0, 2.0/9.0, 0.0, -8.0/9.0, 4.0/9.0, 0.0, -8.0/9.0, 6.0/9.0, 0.0, -8.0/9.0, 8.0/9.0, 0.0, -8.0/9.0, -8.0/9.0, 2.0/9.0, -8.0/9.0, -6.0/9.0, 2.0/9.0, -8.0/9.0, -4.0/9.0, 2.0/9.0, -8.0/9.0, -2.0/9.0, 2.0/9.0, -8.0/9.0, 0.0, 2.0/9.0, -8.0/9.0, 2.0/9.0, 2.0/9.0, -8.0/9.0, 4.0/9.0, 2.0/9.0, -8.0/9.0, 6.0/9.0, 2.0/9.0, -8.0/9.0, 8.0/9.0, 2.0/9.0, -8.0/9.0, -8.0/9.0, 4.0/9.0, -8.0/9.0, -6.0/9.0, 4.0/9.0, -8.0/9.0, -4.0/9.0, 4.0/9.0, -8.0/9.0, -2.0/9.0, 4.0/9.0, -8.0/9.0, 0.0, 4.0/9.0, -8.0/9.0, 2.0/9.0, 4.0/9.0, -8.0/9.0, 4.0/9.0, 4.0/9.0, -8.0/9.0, 6.0/9.0, 4.0/9.0, -8.0/9.0, 8.0/9.0, 4.0/9.0, -8.0/9.0, -8.0/9.0, 6.0/9.0, -8.0/9.0, -6.0/9.0, 6.0/9.0, -8.0/9.0, -4.0/9.0, 6.0/9.0, -8.0/9.0, -2.0/9.0, 6.0/9.0, -8.0/9.0, 0.0, 6.0/9.0, -8.0/9.0, 2.0/9.0, 6.0/9.0, -8.0/9.0, 4.0/9.0, 6.0/9.0, -8.0/9.0, 6.0/9.0, 6.0/9.0, -8.0/9.0, 8.0/9.0, 6.0/9.0, -8.0/9.0, -8.0/9.0, 8.0/9.0, -8.0/9.0, -6.0/9.0, 8.0/9.0, -8.0/9.0, -4.0/9.0, 8.0/9.0, -8.0/9.0, -2.0/9.0, 8.0/9.0, -8.0/9.0, 0.0, 8.0/9.0, -8.0/9.0, 2.0/9.0, 8.0/9.0, -8.0/9.0, 4.0/9.0, 8.0/9.0, -8.0/9.0, 6.0/9.0, 8.0/9.0, -8.0/9.0, 8.0/9.0, 8.0/9.0, -8.0/9.0, -8.0/9.0, -8.0/9.0, -6.0/9.0, -6.0/9.0, -8.0/9.0, -6.0/9.0, -4.0/9.0, -8.0/9.0, -6.0/9.0, -2.0/9.0, -8.0/9.0, -6.0/9.0, 0.0, -8.0/9.0, -6.0/9.0, 2.0/9.0, -8.0/9.0, -6.0/9.0, 4.0/9.0, -8.0/9.0, -6.0/9.0, 6.0/9.0, -8.0/9.0, -6.0/9.0, 8.0/9.0, -8.0/9.0, -6.0/9.0, -8.0/9.0, -6.0/9.0, -6.0/9.0, -6.0/9.0, -6.0/9.0, -6.0/9.0, -4.0/9.0, -6.0/9.0, -6.0/9.0, -2.0/9.0, -6.0/9.0, -6.0/9.0, 0.0, -6.0/9.0, -6.0/9.0, 2.0/9.0, -6.0/9.0, -6.0/9.0, 4.0/9.0, -6.0/9.0, -6.0/9.0, 6.0/9.0, -6.0/9.0, -6.0/9.0, 8.0/9.0, -6.0/9.0, -6.0/9.0, -8.0/9.0, -4.0/9.0, -6.0/9.0, -6.0/9.0, -4.0/9.0, -6.0/9.0, -4.0/9.0, -4.0/9.0, -6.0/9.0, -2.0/9.0, -4.0/9.0, -6.0/9.0, 0.0, -4.0/9.0, -6.0/9.0, 2.0/9.0, -4.0/9.0, -6.0/9.0, 4.0/9.0, -4.0/9.0, -6.0/9.0, 6.0/9.0, -4.0/9.0, -6.0/9.0, 8.0/9.0, -4.0/9.0, -6.0/9.0, -8.0/9.0, -2.0/9.0, -6.0/9.0, -6.0/9.0, -2.0/9.0, -6.0/9.0, -4.0/9.0, -2.0/9.0, -6.0/9.0, -2.0/9.0, -2.0/9.0, -6.0/9.0, 0.0, -2.0/9.0, -6.0/9.0, 2.0/9.0, -2.0/9.0, -6.0/9.0, 4.0/9.0, -2.0/9.0, -6.0/9.0, 6.0/9.0, -2.0/9.0, -6.0/9.0, 8.0/9.0, -2.0/9.0, -6.0/9.0, -8.0/9.0, 0.0, -6.0/9.0, -6.0/9.0, 0.0, -6.0/9.0, -4.0/9.0, 0.0, -6.0/9.0, -2.0/9.0, 0.0, -6.0/9.0, 0.0, 0.0, -6.0/9.0, 2.0/9.0, 0.0, -6.0/9.0, 4.0/9.0, 0.0, -6.0/9.0, 6.0/9.0, 0.0, -6.0/9.0, 8.0/9.0, 0.0, -6.0/9.0, -8.0/9.0, 2.0/9.0, -6.0/9.0, -6.0/9.0, 2.0/9.0, -6.0/9.0, -4.0/9.0, 2.0/9.0, -6.0/9.0, -2.0/9.0, 2.0/9.0, -6.0/9.0, 0.0, 2.0/9.0, -6.0/9.0, 2.0/9.0, 2.0/9.0, -6.0/9.0, 4.0/9.0, 2.0/9.0, -6.0/9.0, 6.0/9.0, 2.0/9.0, -6.0/9.0, 8.0/9.0, 2.0/9.0, -6.0/9.0, -8.0/9.0, 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