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ffmpeg / libavcodec / ac3dec_data.c @ 2912e87a

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/*
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 * AC-3 and E-AC-3 decoder tables
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 * Copyright (c) 2007 Bartlomiej Wolowiec <bartek.wolowiec@gmail.com>
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * Tables taken directly from the AC-3 spec.
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 */
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#include "ac3dec_data.h"
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#include "ac3.h"
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/**
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 * Table used to ungroup 3 values stored in 5 bits.
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 * Used by bap=1 mantissas and GAQ.
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 * ff_ac3_ungroup_3_in_5_bits_tab[i] = { i/9, (i%9)/3, (i%9)%3 }
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 */
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const uint8_t ff_ac3_ungroup_3_in_5_bits_tab[32][3] = {
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    { 0, 0, 0 }, { 0, 0, 1 }, { 0, 0, 2 }, { 0, 1, 0 },
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    { 0, 1, 1 }, { 0, 1, 2 }, { 0, 2, 0 }, { 0, 2, 1 },
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    { 0, 2, 2 }, { 1, 0, 0 }, { 1, 0, 1 }, { 1, 0, 2 },
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    { 1, 1, 0 }, { 1, 1, 1 }, { 1, 1, 2 }, { 1, 2, 0 },
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    { 1, 2, 1 }, { 1, 2, 2 }, { 2, 0, 0 }, { 2, 0, 1 },
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    { 2, 0, 2 }, { 2, 1, 0 }, { 2, 1, 1 }, { 2, 1, 2 },
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    { 2, 2, 0 }, { 2, 2, 1 }, { 2, 2, 2 }, { 3, 0, 0 },
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    { 3, 0, 1 }, { 3, 0, 2 }, { 3, 1, 0 }, { 3, 1, 1 }
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};
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const uint8_t ff_eac3_hebap_tab[64] = {
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    0, 1, 2, 3, 4, 5, 6, 7, 8, 8,
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    8, 8, 9, 9, 9, 10, 10, 10, 10, 11,
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    11, 11, 11, 12, 12, 12, 12, 13, 13, 13,
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    13, 14, 14, 14, 14, 15, 15, 15, 15, 16,
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    16, 16, 16, 17, 17, 17, 17, 18, 18, 18,
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    18, 18, 18, 18, 18, 19, 19, 19, 19, 19,
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    19, 19, 19, 19,
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};
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/**
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 * Table E2.16 Default Coupling Banding Structure
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 */
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const uint8_t ff_eac3_default_cpl_band_struct[18] =
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{ 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1 };
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/**
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 * Table E2.15 Default Spectral Extension Banding Structure
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 */
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const uint8_t ff_eac3_default_spx_band_struct[17] =
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{ 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 };