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dc7e07ac1f
This improves the audio quality significantly for stereo source with both the fixed-point and floating-point AC-3 encoders. Update acodec-ac3_fixed and seek-ac3_rm test references. Originally committed as revision 26271 to svn://svn.ffmpeg.org/ffmpeg/trunk
67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 };
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