2 * MPEG Audio common tables
3 * copyright (c) 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
24 * mpeg audio layer common tables.
27 #ifndef AVCODEC_MPEGAUDIODATA_H
28 #define AVCODEC_MPEGAUDIODATA_H
35 #define MODE_EXT_MS_STEREO 2
36 #define MODE_EXT_I_STEREO 1
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];
45 /* VLCs for decoding layer 3 huffman tables */
46 extern VLC ff_huff_vlc[16];
47 extern VLC ff_huff_quad_vlc[2];
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];
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];
61 extern int16_t *const ff_division_tabs[4];
63 /* lower 2 bits: modulo 3, higher bits: shift */
64 extern uint16_t ff_scale_factor_modshift[64];
66 extern const uint8_t ff_mpa_pretab[2][22];
68 /* Initialize tables shared between the fixed and
69 * floating point MPEG audio decoders. */
70 void ff_mpegaudiodec_common_init_static(void);
72 #endif /* AVCODEC_MPEGAUDIODATA_H */