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FFmpeg/libavcodec/mpegaudiodata.h

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  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 "internal.h"

  33. #include "vlc.h"

  34. 

  35. #define MODE_EXT_MS_STEREO 2

  36. #define MODE_EXT_I_STEREO  1

  37. 

  38. extern av_export_avcodec const uint16_t avpriv_mpa_bitrate_tab[2][3][15];

  39. extern av_export_avcodec const uint16_t avpriv_mpa_freq_tab[3];

  40. extern const int ff_mpa_sblimit_table[5];

  41. extern const int ff_mpa_quant_steps[17];

  42. extern const int ff_mpa_quant_bits[17];

  43. extern const unsigned char * const ff_mpa_alloc_tables[5];

  44. 

  45. /* VLCs for decoding layer 3 huffman tables */

  46. extern VLC ff_huff_vlc[16];

  47. extern VLC ff_huff_quad_vlc[2];

  48. 

  49. /* layer3 scale factor size */

  50. extern const uint8_t ff_slen_table[2][16];

  51. /* number of lsf scale factors for a given size */

  52. extern const uint8_t ff_lsf_nsf_table[6][3][4];

  53. extern const uint8_t ff_mpa_huff_data[32][2];

  54. 

  55. /* band size tables */

  56. extern const uint8_t ff_band_size_long[9][22];

  57. extern const uint8_t ff_band_size_short[9][13];

  58. /* computed from ff_band_size_long */

  59. extern uint16_t ff_band_index_long[9][23];

  60. 

  61. extern int16_t *const ff_division_tabs[4];

  62. 

  63. /* lower 2 bits: modulo 3, higher bits: shift */

  64. extern uint16_t ff_scale_factor_modshift[64];

  65. 

  66. extern const uint8_t ff_mpa_pretab[2][22];

  67. 

  68. /* table for alias reduction (XXX: store it as integer !) */

  69. extern const float ff_ci_table[8];

  70. 

  71. /* Initialize tables shared between the fixed and

  72.  * floating point MPEG audio decoders. */

  73. void ff_mpegaudiodec_common_init_static(void);

  74. 

  75. #endif /* AVCODEC_MPEGAUDIODATA_H */