libavcodec/ac3dec_data.c

   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 libavcodec/ac3dec_data.c
  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 /**
  47  * Table of bin locations for rematrixing bands
  48  * reference: Section 7.5.2 Rematrixing : Frequency Band Definitions
  49  */
  50 const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 };
  51
  52 const uint8_t ff_eac3_hebap_tab[64] = {
  53     0, 1, 2, 3, 4, 5, 6, 7, 8, 8,
  54     8, 8, 9, 9, 9, 10, 10, 10, 10, 11,
  55     11, 11, 11, 12, 12, 12, 12, 13, 13, 13,
  56     13, 14, 14, 14, 14, 15, 15, 15, 15, 16,
  57     16, 16, 16, 17, 17, 17, 17, 18, 18, 18,
  58     18, 18, 18, 18, 18, 19, 19, 19, 19, 19,
  59     19, 19, 19, 19,
  60 };
  61
  62 /**
  63  * Table E2.16 Default Coupling Banding Structure
  64  */
  65 const uint8_t ff_eac3_default_cpl_band_struct[18] =
  66 { 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1 };