1 /* 2 * AC-3 and E-AC-3 decoder tables 3 * Copyright (c) 2007 Bartlomiej Wolowiec <bartek.wolowiec@gmail.com> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22 /** 23 * @file 24 * Tables taken directly from the AC-3 spec. 25 */ 26 27 #include "ac3dec_data.h" 28 #include "ac3.h" 29 30 /** 31 * Table used to ungroup 3 values stored in 5 bits. 32 * Used by bap=1 mantissas and GAQ. 33 * ff_ac3_ungroup_3_in_5_bits_tab[i] = { i/9, (i%9)/3, (i%9)%3 } 34 */ 35 const uint8_t ff_ac3_ungroup_3_in_5_bits_tab[32][3] = { 36 { 0, 0, 0 }, { 0, 0, 1 }, { 0, 0, 2 }, { 0, 1, 0 }, 37 { 0, 1, 1 }, { 0, 1, 2 }, { 0, 2, 0 }, { 0, 2, 1 }, 38 { 0, 2, 2 }, { 1, 0, 0 }, { 1, 0, 1 }, { 1, 0, 2 }, 39 { 1, 1, 0 }, { 1, 1, 1 }, { 1, 1, 2 }, { 1, 2, 0 }, 40 { 1, 2, 1 }, { 1, 2, 2 }, { 2, 0, 0 }, { 2, 0, 1 }, 41 { 2, 0, 2 }, { 2, 1, 0 }, { 2, 1, 1 }, { 2, 1, 2 }, 42 { 2, 2, 0 }, { 2, 2, 1 }, { 2, 2, 2 }, { 3, 0, 0 }, 43 { 3, 0, 1 }, { 3, 0, 2 }, { 3, 1, 0 }, { 3, 1, 1 } 44 }; 45 46 const uint8_t ff_eac3_hebap_tab[64] = { 47 0, 1, 2, 3, 4, 5, 6, 7, 8, 8, 48 8, 8, 9, 9, 9, 10, 10, 10, 10, 11, 49 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, 50 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 51 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 52 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 53 19, 19, 19, 19, 54 }; 55 56 /** 57 * Table E2.15 Default Spectral Extension Banding Structure 58 */ 59 const uint8_t ff_eac3_default_spx_band_struct[17] = 60 { 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 }; 61