libavcodec/mpegaudiodata.h

   1 /*
   2  * MPEG Audio common tables
   3  * copyright (c) 2002 Fabrice Bellard
   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  * mpeg audio layer common tables.
  25  */
  26
  27 #ifndef AVCODEC_MPEGAUDIODATA_H
  28 #define AVCODEC_MPEGAUDIODATA_H
  29
  30 #include <stdint.h>
  31
  32 #include "config.h"
  33
  34 #include "libavutil/attributes_internal.h"
  35 #include "vlc.h"
  36
  37 #define MODE_EXT_MS_STEREO 2
  38 #define MODE_EXT_I_STEREO  1
  39
  40 FF_VISIBILITY_PUSH_HIDDEN
  41 extern const uint16_t ff_mpa_bitrate_tab[2][3][15];
  42 extern const uint16_t ff_mpa_freq_tab[3];
  43 extern const int ff_mpa_sblimit_table[5];
  44 extern const int ff_mpa_quant_steps[17];
  45 extern const int ff_mpa_quant_bits[17];
  46 extern const unsigned char * const ff_mpa_alloc_tables[5];
  47
  48 #define TABLE_4_3_SIZE ((8191 + 16)*4)
  49 #if CONFIG_HARDCODED_TABLES
  50 extern const int8_t   ff_table_4_3_exp  [TABLE_4_3_SIZE];
  51 extern const uint32_t ff_table_4_3_value[TABLE_4_3_SIZE];
  52 #else
  53 extern int8_t   ff_table_4_3_exp  [TABLE_4_3_SIZE];
  54 extern uint32_t ff_table_4_3_value[TABLE_4_3_SIZE];
  55 #endif
  56
  57 /* VLCs for decoding layer 3 huffman tables */
  58 extern const VLCElem *ff_huff_vlc[16];
  59 extern VLC ff_huff_quad_vlc[2];
  60
  61 /* layer3 scale factor size */
  62 extern const uint8_t ff_slen_table[2][16];
  63 /* number of lsf scale factors for a given size */
  64 extern const uint8_t ff_lsf_nsf_table[6][3][4];
  65 extern const uint8_t ff_mpa_huff_data[32][2];
  66
  67 /* band size tables */
  68 extern const uint8_t ff_band_size_long[9][22];
  69 extern const uint8_t ff_band_size_short[9][13];
  70 /* computed from ff_band_size_long */
  71 extern uint16_t ff_band_index_long[9][23];
  72
  73 extern int16_t *const ff_division_tabs[4];
  74
  75 /* lower 2 bits: modulo 3, higher bits: shift */
  76 extern uint16_t ff_scale_factor_modshift[64];
  77
  78 extern const uint8_t ff_mpa_pretab[2][22];
  79
  80 /* Initialize tables shared between the fixed and
  81  * floating point MPEG audio decoders. */
  82 void ff_mpegaudiodec_common_init_static(void);
  83 FF_VISIBILITY_POP_HIDDEN
  84
  85 #endif /* AVCODEC_MPEGAUDIODATA_H */