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https://github.com/FFmpeg/FFmpeg.git
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c9aa80c313
For some VLCs here, the number of bits of the VLC is write-only, because it is hardcoded at the call site. Therefore one can replace these VLC structures with the only thing that is actually used: The pointer to the VLCElem table. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
/*
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* MPEG Audio common tables
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* copyright (c) 2002 Fabrice Bellard
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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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* mpeg audio layer common tables.
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*/
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#ifndef AVCODEC_MPEGAUDIODATA_H
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#define AVCODEC_MPEGAUDIODATA_H
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#include <stdint.h>
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#include "config.h"
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#include "vlc.h"
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#define MODE_EXT_MS_STEREO 2
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#define MODE_EXT_I_STEREO 1
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extern const uint16_t ff_mpa_bitrate_tab[2][3][15];
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extern const uint16_t ff_mpa_freq_tab[3];
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extern const int ff_mpa_sblimit_table[5];
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extern const int ff_mpa_quant_steps[17];
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extern const int ff_mpa_quant_bits[17];
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extern const unsigned char * const ff_mpa_alloc_tables[5];
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#define TABLE_4_3_SIZE ((8191 + 16)*4)
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#if CONFIG_HARDCODED_TABLES
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extern const int8_t ff_table_4_3_exp [TABLE_4_3_SIZE];
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extern const uint32_t ff_table_4_3_value[TABLE_4_3_SIZE];
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#else
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extern int8_t ff_table_4_3_exp [TABLE_4_3_SIZE];
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extern uint32_t ff_table_4_3_value[TABLE_4_3_SIZE];
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#endif
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/* VLCs for decoding layer 3 huffman tables */
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extern const VLCElem *ff_huff_vlc[16];
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extern VLC ff_huff_quad_vlc[2];
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/* layer3 scale factor size */
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extern const uint8_t ff_slen_table[2][16];
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/* number of lsf scale factors for a given size */
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extern const uint8_t ff_lsf_nsf_table[6][3][4];
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extern const uint8_t ff_mpa_huff_data[32][2];
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/* band size tables */
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extern const uint8_t ff_band_size_long[9][22];
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extern const uint8_t ff_band_size_short[9][13];
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/* computed from ff_band_size_long */
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extern uint16_t ff_band_index_long[9][23];
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extern int16_t *const ff_division_tabs[4];
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/* lower 2 bits: modulo 3, higher bits: shift */
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extern uint16_t ff_scale_factor_modshift[64];
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extern const uint8_t ff_mpa_pretab[2][22];
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/* Initialize tables shared between the fixed and
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* floating point MPEG audio decoders. */
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void ff_mpegaudiodec_common_init_static(void);
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#endif /* AVCODEC_MPEGAUDIODATA_H */
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