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- /*
- * @(#) 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 <stdlib.h>
- #include "subband_layer_2.h"
- #include "scalefactors.h"
-
-
- 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, 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, 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, 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, -8.0/9.0, -4.0/9.0, -6.0/9.0, -8.0/9.0, -4.0/9.0, -4.0/9.0, -8.0/9.0, -4.0/9.0,
- -2.0/9.0, -8.0/9.0, -4.0/9.0, 0.0, -8.0/9.0, -4.0/9.0, 2.0/9.0, -8.0/9.0, -4.0/9.0,
- 4.0/9.0, -8.0/9.0, -4.0/9.0, 6.0/9.0, -8.0/9.0, -4.0/9.0, 8.0/9.0, -8.0/9.0, -4.0/9.0,
- -8.0/9.0, -6.0/9.0, -4.0/9.0, -6.0/9.0, -6.0/9.0, -4.0/9.0, -4.0/9.0, -6.0/9.0, -4.0/9.0,
- -2.0/9.0, -6.0/9.0, -4.0/9.0, 0.0, -6.0/9.0, -4.0/9.0, 2.0/9.0, -6.0/9.0, -4.0/9.0,
- 4.0/9.0, -6.0/9.0, -4.0/9.0, 6.0/9.0, -6.0/9.0, -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, -6.0/9.0, -4.0/9.0, -4.0/9.0, -4.0/9.0, -4.0/9.0, -4.0/9.0,
- -2.0/9.0, -4.0/9.0, -4.0/9.0, 0.0, -4.0/9.0, -4.0/9.0, 2.0/9.0, -4.0/9.0, -4.0/9.0,
- 4.0/9.0, -4.0/9.0, -4.0/9.0, 6.0/9.0, -4.0/9.0, -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, -6.0/9.0, -2.0/9.0, -4.0/9.0, -4.0/9.0, -2.0/9.0, -4.0/9.0,
- -2.0/9.0, -2.0/9.0, -4.0/9.0, 0.0, -2.0/9.0, -4.0/9.0, 2.0/9.0, -2.0/9.0, -4.0/9.0,
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- -8.0/9.0, 0.0, 4.0/9.0, -6.0/9.0, 0.0, 4.0/9.0, -4.0/9.0, 0.0, 4.0/9.0,
- -2.0/9.0, 0.0, 4.0/9.0, 0.0, 0.0, 4.0/9.0, 2.0/9.0, 0.0, 4.0/9.0,
- 4.0/9.0, 0.0, 4.0/9.0, 6.0/9.0, 0.0, 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, -6.0/9.0, 2.0/9.0, 4.0/9.0, -4.0/9.0, 2.0/9.0, 4.0/9.0,
- -2.0/9.0, 2.0/9.0, 4.0/9.0, 0.0, 2.0/9.0, 4.0/9.0, 2.0/9.0, 2.0/9.0, 4.0/9.0,
- 4.0/9.0, 2.0/9.0, 4.0/9.0, 6.0/9.0, 2.0/9.0, 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, -6.0/9.0, 4.0/9.0, 4.0/9.0, -4.0/9.0, 4.0/9.0, 4.0/9.0,
- -2.0/9.0, 4.0/9.0, 4.0/9.0, 0.0, 4.0/9.0, 4.0/9.0, 2.0/9.0, 4.0/9.0, 4.0/9.0,
- 4.0/9.0, 4.0/9.0, 4.0/9.0, 6.0/9.0, 4.0/9.0, 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, -6.0/9.0, 6.0/9.0, 4.0/9.0, -4.0/9.0, 6.0/9.0, 4.0/9.0,
- -2.0/9.0, 6.0/9.0, 4.0/9.0, 0.0, 6.0/9.0, 4.0/9.0, 2.0/9.0, 6.0/9.0, 4.0/9.0,
- 4.0/9.0, 6.0/9.0, 4.0/9.0, 6.0/9.0, 6.0/9.0, 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, -6.0/9.0, 8.0/9.0, 4.0/9.0, -4.0/9.0, 8.0/9.0, 4.0/9.0,
- -2.0/9.0, 8.0/9.0, 4.0/9.0, 0.0, 8.0/9.0, 4.0/9.0, 2.0/9.0, 8.0/9.0, 4.0/9.0,
- 4.0/9.0, 8.0/9.0, 4.0/9.0, 6.0/9.0, 8.0/9.0, 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, -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, 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, 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, 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, -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
- };
-
-
- // data taken from ISO/IEC DIS 11172, Annexes 3-B.2[abcd] and 3-B.4:
-
- // subbands 0-2 in tables 3-B.2a and 2b: (index is allocation)
- static const uint32 table_ab1_codelength[16] =
- // bits per codeword
- { 0, 5, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
-
- static const real *table_ab1_groupingtables[16] =
- // pointer to sample grouping table, or NULL-pointer if ungrouped
- { 0, grouping_5bits, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
-
- static const real table_ab1_factor[16] =
- // factor for requantization: (real)sample * factor - 1.0 gives requantized sample
- { 0.0, 1.0/2.0, 1.0/4.0, 1.0/8.0, 1.0/16.0, 1.0/32.0, 1.0/64.0,
- 1.0/128.0, 1.0/256.0, 1.0/512.0, 1.0/1024.0, 1.0/2048.0,
- 1.0/4096.0, 1.0/8192.0, 1.0/16384.0, 1.0/32768.0 };
-
- static const real table_ab1_c[16] =
- // factor c for requantization from table 3-B.4
- { 0.0, 1.33333333333, 1.14285714286, 1.06666666666, 1.03225806452,
- 1.01587301587, 1.00787401575, 1.00392156863, 1.00195694716, 1.00097751711,
- 1.00048851979, 1.00024420024, 1.00012208522, 1.00006103888, 1.00003051851,
- 1.00001525902 };
- static const real table_ab1_d[16] =
- // addend d for requantization from table 3-B.4
- { 0.0, 0.50000000000, 0.25000000000, 0.12500000000, 0.06250000000,
- 0.03125000000, 0.01562500000, 0.00781250000, 0.00390625000, 0.00195312500,
- 0.00097656250, 0.00048828125, 0.00024414063, 0.00012207031, 0.00006103516,
- 0.00003051758 };
-
- // subbands 3-... tables 3-B.2a and 2b:
- static const real *table_ab234_groupingtables[16] =
- { 0, grouping_5bits, grouping_7bits, 0, grouping_10bits, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
-
- // subbands 3-10 in tables 3-B.2a and 2b:
- static const uint32 table_ab2_codelength[16] =
- { 0, 5, 7, 3, 10, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16 };
- static const real table_ab2_factor[16] =
- { 0.0, 1.0/2.0, 1.0/4.0, 1.0/4.0, 1.0/8.0, 1.0/8.0, 1.0/16.0,
- 1.0/32.0, 1.0/64.0, 1.0/128.0, 1.0/256.0, 1.0/512.0,
- 1.0/1024.0, 1.0/2048.0, 1.0/4096.0, 1.0/32768.0 };
- static const real table_ab2_c[16] =
- { 0.0, 1.33333333333, 1.60000000000, 1.14285714286, 1.77777777777,
- 1.06666666666, 1.03225806452, 1.01587301587, 1.00787401575, 1.00392156863,
- 1.00195694716, 1.00097751711, 1.00048851979, 1.00024420024, 1.00012208522,
- 1.00001525902 };
- static const real table_ab2_d[16] =
- { 0.0, 0.50000000000, 0.50000000000, 0.25000000000, 0.50000000000,
- 0.12500000000, 0.06250000000, 0.03125000000, 0.01562500000, 0.00781250000,
- 0.00390625000, 0.00195312500, 0.00097656250, 0.00048828125, 0.00024414063,
- 0.00003051758 };
-
- // subbands 11-22 in tables 3-B.2a and 2b:
- static const uint32 table_ab3_codelength[8] = { 0, 5, 7, 3, 10, 4, 5, 16 };
- static const real table_ab3_factor[8] =
- { 0.0, 1.0/2.0, 1.0/4.0, 1.0/4.0, 1.0/8.0, 1.0/8.0, 1.0/16.0, 1.0/32768.0 };
- static const real table_ab3_c[8] =
- { 0.0, 1.33333333333, 1.60000000000, 1.14285714286, 1.77777777777,
- 1.06666666666, 1.03225806452, 1.00001525902 };
- static const real table_ab3_d[8] =
- { 0.0, 0.50000000000, 0.50000000000, 0.25000000000, 0.50000000000,
- 0.12500000000, 0.06250000000, 0.00003051758 };
-
- // subbands 23-... in tables 3-B.2a and 2b:
- static const uint32 table_ab4_codelength[4] = { 0, 5, 7, 16 };
- static const real table_ab4_factor[8] = { 0.0, 1.0/2.0, 1.0/4.0, 1.0/32768.0 };
- static const real table_ab4_c[4] = { 0.0, 1.33333333333, 1.60000000000, 1.00001525902 };
- static const real table_ab4_d[4] = { 0.0, 0.50000000000, 0.50000000000, 0.00003051758 };
-
- // subbands in tables 3-B.2c and 2d:
- static const uint32 table_cd_codelength[16] =
- { 0, 5, 7, 10, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
- static const real *table_cd_groupingtables[16] =
- { 0, grouping_5bits, grouping_7bits, grouping_10bits, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
- static const real table_cd_factor[16] =
- { 0.0, 1.0/2.0, 1.0/4.0, 1.0/8.0, 1.0/8.0, 1.0/16.0, 1.0/32.0, 1.0/64.0,
- 1.0/128.0, 1.0/256.0, 1.0/512.0, 1.0/1024.0, 1.0/2048.0, 1.0/4096.0,
- 1.0/8192.0, 1.0/16384.0 };
- static const real table_cd_c[16] =
- { 0.0, 1.33333333333, 1.60000000000, 1.77777777777, 1.06666666666,
- 1.03225806452, 1.01587301587, 1.00787401575, 1.00392156863, 1.00195694716,
- 1.00097751711, 1.00048851979, 1.00024420024, 1.00012208522, 1.00006103888,
- 1.00003051851 };
- static const real table_cd_d[16] =
- { 0.0, 0.50000000000, 0.50000000000, 0.50000000000, 0.12500000000,
- 0.06250000000, 0.03125000000, 0.01562500000, 0.00781250000, 0.00390625000,
- 0.00195312500, 0.00097656250, 0.00048828125, 0.00024414063, 0.00012207031,
- 0.00006103516 };
-
-
-
- /**********************/ // used for single channel mode
- /*** Standard Class ***/ // and in derived class for intensity
- /**********************/ // stereo mode
-
- SubbandLayer2::SubbandLayer2 (uint32 subbandnumber)
- {
- this->subbandnumber = subbandnumber;
- groupnumber = samplenumber = 0;
- }
-
-
- uint32 SubbandLayer2::get_allocationlength (Header *header)
- {
- uint32 channel_bitrate = header->bitrate_index ();
-
- // calculate bitrate per channel:
- if (header->mode () != single_channel)
- if (channel_bitrate == 4)
- channel_bitrate = 1;
- else
- channel_bitrate -= 4;
-
- if (channel_bitrate == 1 || channel_bitrate == 2)
- // table 3-B.2c or 3-B.2d
- if (subbandnumber <= 1)
- return 4;
- else
- return 3;
- else
- // tables 3-B.2a or 3-B.2b
- if (subbandnumber <= 10)
- return 4;
- else if (subbandnumber <= 22)
- return 3;
- else
- return 2;
- }
-
-
- void SubbandLayer2::prepare_sample_reading (Header *header, uint32 allocation,
- const real **groupingtable, real *factor, uint32 *codelength, real *c, real *d)
- {
- uint32 channel_bitrate = header->bitrate_index ();
-
- // calculate bitrate per channel:
- if (header->mode () != single_channel)
- if (channel_bitrate == 4)
- channel_bitrate = 1;
- else
- channel_bitrate -= 4;
-
- if (channel_bitrate == 1 || channel_bitrate == 2)
- {
- // table 3-B.2c or 3-B.2d
- *groupingtable = table_cd_groupingtables[allocation];
- *factor = table_cd_factor[allocation];
- *codelength = table_cd_codelength[allocation];
- *c = table_cd_c[allocation];
- *d = table_cd_d[allocation];
- }
- else
- {
- // tables 3-B.2a or 3-B.2b
- if (subbandnumber <= 2)
- {
- *groupingtable = table_ab1_groupingtables[allocation];
- *factor = table_ab1_factor[allocation];
- *codelength = table_ab1_codelength[allocation];
- *c = table_ab1_c[allocation];
- *d = table_ab1_d[allocation];
- }
- else
- {
- *groupingtable = table_ab234_groupingtables[allocation];
- if (subbandnumber <= 10)
- {
- *factor = table_ab2_factor[allocation];
- *codelength = table_ab2_codelength[allocation];
- *c = table_ab2_c[allocation];
- *d = table_ab2_d[allocation];
- }
- else if (subbandnumber <= 22)
- {
- *factor = table_ab3_factor[allocation];
- *codelength = table_ab3_codelength[allocation];
- *c = table_ab3_c[allocation];
- *d = table_ab3_d[allocation];
- }
- else
- {
- *factor = table_ab4_factor[allocation];
- *codelength = table_ab4_codelength[allocation];
- *c = table_ab4_c[allocation];
- *d = table_ab4_d[allocation];
- }
- }
- }
- }
-
-
- void SubbandLayer2::read_allocation (Ibitstream *stream, Header *header, Crc16 *crc)
- {
- register uint32 length = get_allocationlength (header);
- allocation = stream->get_bits (length);
- if (crc)
- crc->add_bits (allocation, length);
- }
-
-
- void SubbandLayer2::read_scalefactor_selection (Ibitstream *stream, Crc16 *crc)
- {
- if (allocation)
- {
- scfsi = stream->get_bits (2);
- if (crc)
- crc->add_bits (scfsi, 2);
- }
- }
-
-
- void SubbandLayer2::read_scalefactor (Ibitstream *stream, Header *header)
- {
- if (allocation)
- {
- switch (scfsi)
- {
- case 0:
- scalefactor1 = scalefactors[stream->get_bits (6)];
- scalefactor2 = scalefactors[stream->get_bits (6)];
- scalefactor3 = scalefactors[stream->get_bits (6)];
- break;
- case 1:
- scalefactor1 = scalefactor2 = scalefactors[stream->get_bits (6)];
- scalefactor3 = scalefactors[stream->get_bits (6)];
- break;
- case 2:
- scalefactor1 = scalefactor2 = scalefactor3 = scalefactors[stream->get_bits (6)];
- break;
- case 3:
- scalefactor1 = scalefactors[stream->get_bits (6)];
- scalefactor2 = scalefactor3 = scalefactors[stream->get_bits (6)];
- break;
- }
- prepare_sample_reading (header, allocation, &groupingtable,
- &factor, &codelength, &c, &d);
- }
- }
-
-
- bool SubbandLayer2::read_sampledata (Ibitstream *stream)
- {
- if (allocation)
- if (groupingtable)
- {
- uint32 samplecode = stream->get_bits (codelength);
- #ifdef DEBUG
- if (samplecode == (1 << codelength) - 1)
- cerr << "WARNING: stream contains an illegal subband sample!\n"; // MPEG-stream is corrupted!
- #endif
- // create requantized samples:
- samplecode += samplecode << 1;
- register real *target = samples;
- register const real *source = groupingtable + samplecode;
- *target++ = *source++;
- *target++ = *source++;
- *target = *source;
- // memcpy (samples, groupingtable + samplecode, 3 * sizeof (real));
- }
- else
- {
- samples[0] = real (stream->get_bits (codelength)) * factor - 1.0;
- samples[1] = real (stream->get_bits (codelength)) * factor - 1.0;
- samples[2] = real (stream->get_bits (codelength)) * factor - 1.0;
- #ifdef DEBUG
- if (samples[0] == (1 << codelength) - 1)
- cerr << "WARNING: stream contains an illegal subband sample!\n"; // MPEG-stream is corrupted!
- if (samples[1] == (1 << codelength) - 1)
- cerr << "WARNING: stream contains an illegal subband sample!\n"; // MPEG-stream is corrupted!
- if (samples[2] == (1 << codelength) - 1)
- cerr << "WARNING: stream contains an illegal subband sample!\n"; // MPEG-stream is corrupted!
- #endif
- }
-
- samplenumber = 0;
- if (++groupnumber == 12)
- return True;
- else
- return False;
- }
-
-
- bool SubbandLayer2::put_next_sample (e_channels channels,
- SynthesisFilter *filter1, SynthesisFilter *)
- {
- #ifdef DEBUG
- if (samplenumber >= 3)
- {
- // don't call put_next_sample if the previous call returned True;
- cerr << "Illegal call to SubbandLayer2::put_next_sample()!\n";
- exit (1);
- }
- #endif
- if (allocation && channels != right)
- {
- register real sample = samples[samplenumber];
-
- if (!groupingtable)
- sample = (sample + d) * c;
- if (groupnumber <= 4)
- sample *= scalefactor1;
- else if (groupnumber <= 8)
- sample *= scalefactor2;
- else
- sample *= scalefactor3;
- #ifdef DEBUG
- if (sample < -1.0 || sample > 1.0)
- cerr << "WARNING: rescaled subband sample is not in [-1.0, 1.0]\n";
- // this should never occur
- #endif
- filter1->input_sample (sample, subbandnumber);
- }
-
- if (++samplenumber == 3)
- return True;
- else
- return False;
- }
-
-
-
- /******************************/
- /*** Intensity Stereo Class ***/
- /******************************/
-
- SubbandLayer2IntensityStereo::SubbandLayer2IntensityStereo (uint32 subbandnumber)
- : SubbandLayer2 (subbandnumber)
- {
- }
-
-
- void SubbandLayer2IntensityStereo::read_scalefactor_selection (Ibitstream *stream, Crc16 *crc)
- {
- if (allocation)
- {
- scfsi = stream->get_bits (2);
- channel2_scfsi = stream->get_bits (2);
- if (crc)
- {
- crc->add_bits (scfsi, 2);
- crc->add_bits (channel2_scfsi, 2);
- }
- }
- }
-
-
- void SubbandLayer2IntensityStereo::read_scalefactor (Ibitstream *stream, Header *header)
- {
- if (allocation)
- {
- SubbandLayer2::read_scalefactor (stream, header);
- switch (channel2_scfsi)
- {
- case 0:
- channel2_scalefactor1 = scalefactors[stream->get_bits (6)];
- channel2_scalefactor2 = scalefactors[stream->get_bits (6)];
- channel2_scalefactor3 = scalefactors[stream->get_bits (6)];
- break;
- case 1:
- channel2_scalefactor1 = channel2_scalefactor2 = scalefactors[stream->get_bits (6)];
- channel2_scalefactor3 = scalefactors[stream->get_bits (6)];
- break;
- case 2:
- channel2_scalefactor1 = channel2_scalefactor2 =
- channel2_scalefactor3 = scalefactors[stream->get_bits (6)];
- break;
- case 3:
- channel2_scalefactor1 = scalefactors[stream->get_bits (6)];
- channel2_scalefactor2 = channel2_scalefactor3 = scalefactors[stream->get_bits (6)];
- break;
- }
- }
- }
-
-
- bool SubbandLayer2IntensityStereo::put_next_sample (e_channels channels,
- SynthesisFilter *filter1, SynthesisFilter *filter2)
- {
- #ifdef DEBUG
- if (samplenumber >= 3)
- {
- // don't call put_next_sample if the previous call returned True;
- cerr << "Illegal call to SubbandLayer2::put_next_sample()!\n";
- exit (1);
- }
- #endif
- if (allocation)
- {
- register real sample = samples[samplenumber];
-
- if (!groupingtable)
- sample = (sample + d) * c;
- if (channels == both)
- {
- register float sample2 = sample;
- if (groupnumber <= 4)
- {
- sample *= scalefactor1;
- sample2 *= channel2_scalefactor1;
- }
- else if (groupnumber <= 8)
- {
- sample *= scalefactor2;
- sample2 *= channel2_scalefactor2;
- }
- else
- {
- sample *= scalefactor3;
- sample2 *= channel2_scalefactor3;
- }
- #ifdef DEBUG
- if (sample < -1.0 || sample > 1.0 || sample2 < -1.0 || sample2 > 1.0)
- cerr << "WARNING: rescaled subband sample is not in [-1.0, 1.0]\n";
- // this should never occur
- #endif
- filter1->input_sample (sample, subbandnumber);
- filter2->input_sample (sample2, subbandnumber);
- }
- else if (channels == left)
- {
- if (groupnumber <= 4)
- sample *= scalefactor1;
- else if (groupnumber <= 8)
- sample *= scalefactor2;
- else
- sample *= scalefactor3;
- #ifdef DEBUG
- if (sample < -1.0 || sample > 1.0)
- cerr << "WARNING: rescaled subband sample is not in [-1.0, 1.0]\n";
- // this should never occur
- #endif
- filter1->input_sample (sample, subbandnumber);
- }
- else
- {
- if (groupnumber <= 4)
- sample *= channel2_scalefactor1;
- else if (groupnumber <= 8)
- sample *= channel2_scalefactor2;
- else
- sample *= channel2_scalefactor3;
- #ifdef DEBUG
- if (sample < -1.0 || sample > 1.0)
- cerr << "WARNING: rescaled subband sample is not in [-1.0, 1.0]\n";
- // this should never occur
- #endif
- filter1->input_sample (sample, subbandnumber);
- }
- }
-
- if (++samplenumber == 3)
- return True;
- else
- return False;
- }
-
-
-
- /********************/
- /*** Stereo Class ***/
- /********************/
-
- SubbandLayer2Stereo::SubbandLayer2Stereo (uint32 subbandnumber)
- : SubbandLayer2 (subbandnumber)
- {
- }
-
-
- void SubbandLayer2Stereo::read_allocation (Ibitstream *stream, Header *header, Crc16 *crc)
- {
- uint32 length = get_allocationlength (header);
- allocation = stream->get_bits (length);
- channel2_allocation = stream->get_bits (length);
- if (crc)
- {
- crc->add_bits (allocation, length);
- crc->add_bits (channel2_allocation, length);
- }
- }
-
-
- void SubbandLayer2Stereo::read_scalefactor_selection (Ibitstream *stream, Crc16 *crc)
- {
- if (allocation)
- {
- scfsi = stream->get_bits (2);
- if (crc)
- crc->add_bits (scfsi, 2);
- }
- if (channel2_allocation)
- {
- channel2_scfsi = stream->get_bits (2);
- if (crc)
- crc->add_bits (channel2_scfsi, 2);
- }
- }
-
-
- void SubbandLayer2Stereo::read_scalefactor (Ibitstream *stream, Header *header)
- {
- SubbandLayer2::read_scalefactor (stream, header);
- if (channel2_allocation)
- {
- switch (channel2_scfsi)
- {
- case 0:
- channel2_scalefactor1 = scalefactors[stream->get_bits (6)];
- channel2_scalefactor2 = scalefactors[stream->get_bits (6)];
- channel2_scalefactor3 = scalefactors[stream->get_bits (6)];
- break;
- case 1:
- channel2_scalefactor1 = channel2_scalefactor2 = scalefactors[stream->get_bits (6)];
- channel2_scalefactor3 = scalefactors[stream->get_bits (6)];
- break;
- case 2:
- channel2_scalefactor1 = channel2_scalefactor2 =
- channel2_scalefactor3 = scalefactors[stream->get_bits (6)];
- break;
- case 3:
- channel2_scalefactor1 = scalefactors[stream->get_bits (6)];
- channel2_scalefactor2 = channel2_scalefactor3 = scalefactors[stream->get_bits (6)];
- break;
- }
- prepare_sample_reading (header, channel2_allocation, &channel2_groupingtable, &channel2_factor,
- &channel2_codelength, &channel2_c, &channel2_d);
- }
- }
-
-
- bool SubbandLayer2Stereo::read_sampledata (Ibitstream *stream)
- {
- bool returnvalue = SubbandLayer2::read_sampledata (stream);
-
- if (channel2_allocation)
- if (channel2_groupingtable)
- {
- uint32 samplecode = stream->get_bits (channel2_codelength);
- #ifdef DEBUG
- if (samplecode == (1 << channel2_codelength) - 1)
- cerr << "WARNING: stream contains an illegal subband sample!\n"; // MPEG-stream is corrupted!
- #endif
- // create requantized samples:
- samplecode += samplecode << 1;
- register real *target = channel2_samples;
- register const real *source = channel2_groupingtable + samplecode;
- *target++ = *source++;
- *target++ = *source++;
- *target = *source;
- // memcpy (channel2_samples, channel2_groupingtable + samplecode, 3 * sizeof (real));
- }
- else
- {
- channel2_samples[0] = real (stream->get_bits (channel2_codelength)) * channel2_factor - 1.0;
- channel2_samples[1] = real (stream->get_bits (channel2_codelength)) * channel2_factor - 1.0;
- channel2_samples[2] = real (stream->get_bits (channel2_codelength)) * channel2_factor - 1.0;
- #ifdef DEBUG
- if (channel2_samples[0] == (1 << channel2_codelength) - 1)
- cerr << "WARNING: stream contains an illegal subband sample!\n"; // MPEG-stream is corrupted!
- if (channel2_samples[1] == (1 << channel2_codelength) - 1)
- cerr << "WARNING: stream contains an illegal subband sample!\n"; // MPEG-stream is corrupted!
- if (channel2_samples[2] == (1 << channel2_codelength) - 1)
- cerr << "WARNING: stream contains an illegal subband sample!\n"; // MPEG-stream is corrupted!
- #endif
- }
- return returnvalue;
- }
-
-
- bool SubbandLayer2Stereo::put_next_sample (e_channels channels,
- SynthesisFilter *filter1, SynthesisFilter *filter2)
- {
- bool returnvalue = SubbandLayer2::put_next_sample (channels, filter1, filter2);
- if (channel2_allocation && channels != left)
- {
- register real sample = channel2_samples[samplenumber - 1];
-
- if (!channel2_groupingtable)
- sample = (sample + channel2_d) * channel2_c;
-
- if (groupnumber <= 4)
- sample *= channel2_scalefactor1;
- else if (groupnumber <= 8)
- sample *= channel2_scalefactor2;
- else
- sample *= channel2_scalefactor3;
- #ifdef DEBUG
- if (sample < -1.0 || sample > 1.0)
- cerr << "WARNING: rescaled subband sample is not in [-1.0, 1.0]\n";
- // this should never occur
- #endif
- if (channels == both)
- filter2->input_sample (sample, subbandnumber);
- else
- filter1->input_sample (sample, subbandnumber);
- }
- return returnvalue;
- }
-