mpegaudiodata.c 4.7 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
/*
 * MPEG Audio common tables
 * copyright (c) 2002 Fabrice Bellard
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
23
 * @file
24 25 26 27 28 29
 * mpeg audio layer common tables.
 */

#include "mpegaudiodata.h"


30
const uint16_t avpriv_mpa_bitrate_tab[2][3][15] = {
31
    { {0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448 },
32 33 34 35 36
      {0, 32, 48, 56,  64,  80,  96, 112, 128, 160, 192, 224, 256, 320, 384 },
      {0, 32, 40, 48,  56,  64,  80,  96, 112, 128, 160, 192, 224, 256, 320 } },
    { {0, 32, 48, 56,  64,  80,  96, 112, 128, 144, 160, 176, 192, 224, 256},
      {0,  8, 16, 24,  32,  40,  48,  56,  64,  80,  96, 112, 128, 144, 160},
      {0,  8, 16, 24,  32,  40,  48,  56,  64,  80,  96, 112, 128, 144, 160}
37 38 39
    }
};

40
const uint16_t avpriv_mpa_freq_tab[3] = { 44100, 48000, 32000 };
41 42 43 44

/*******************************************************/
/* layer 2 tables */

45
const int ff_mpa_sblimit_table[5] = { 27 , 30 , 8, 12 , 30 };
46

47
const int ff_mpa_quant_steps[17] = {
48 49 50 51 52 53 54
    3,     5,    7,    9,    15,
    31,    63,  127,  255,   511,
    1023,  2047, 4095, 8191, 16383,
    32767, 65535
};

/* we use a negative value if grouped */
55
const int ff_mpa_quant_bits[17] = {
56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144
    -5,  -7,  3, -10, 4,
     5,  6,  7,  8,  9,
    10, 11, 12, 13, 14,
    15, 16
};

/* encoding tables which give the quantization index. Note how it is
   possible to store them efficiently ! */
static const unsigned char alloc_table_1[] = {
 4,  0,  2,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16,
 4,  0,  2,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16,
 4,  0,  2,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16,
 4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
 4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
 4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
 4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
 4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
 4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
 4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
 4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
 3,  0,  1,  2,  3,  4,  5, 16,
 3,  0,  1,  2,  3,  4,  5, 16,
 3,  0,  1,  2,  3,  4,  5, 16,
 3,  0,  1,  2,  3,  4,  5, 16,
 3,  0,  1,  2,  3,  4,  5, 16,
 3,  0,  1,  2,  3,  4,  5, 16,
 3,  0,  1,  2,  3,  4,  5, 16,
 3,  0,  1,  2,  3,  4,  5, 16,
 3,  0,  1,  2,  3,  4,  5, 16,
 3,  0,  1,  2,  3,  4,  5, 16,
 3,  0,  1,  2,  3,  4,  5, 16,
 3,  0,  1,  2,  3,  4,  5, 16,
 2,  0,  1, 16,
 2,  0,  1, 16,
 2,  0,  1, 16,
 2,  0,  1, 16,
 2,  0,  1, 16,
 2,  0,  1, 16,
 2,  0,  1, 16,
};

static const unsigned char alloc_table_3[] = {
 4,  0,  1,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
 4,  0,  1,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
 3,  0,  1,  3,  4,  5,  6,  7,
 3,  0,  1,  3,  4,  5,  6,  7,
 3,  0,  1,  3,  4,  5,  6,  7,
 3,  0,  1,  3,  4,  5,  6,  7,
 3,  0,  1,  3,  4,  5,  6,  7,
 3,  0,  1,  3,  4,  5,  6,  7,
 3,  0,  1,  3,  4,  5,  6,  7,
 3,  0,  1,  3,  4,  5,  6,  7,
 3,  0,  1,  3,  4,  5,  6,  7,
 3,  0,  1,  3,  4,  5,  6,  7,
};

static const unsigned char alloc_table_4[] = {
 4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
 4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
 4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
 4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
 3,  0,  1,  3,  4,  5,  6,  7,
 3,  0,  1,  3,  4,  5,  6,  7,
 3,  0,  1,  3,  4,  5,  6,  7,
 3,  0,  1,  3,  4,  5,  6,  7,
 3,  0,  1,  3,  4,  5,  6,  7,
 3,  0,  1,  3,  4,  5,  6,  7,
 3,  0,  1,  3,  4,  5,  6,  7,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
 2,  0,  1,  3,
};

145
const unsigned char * const ff_mpa_alloc_tables[5] =
146
{ alloc_table_1, alloc_table_1, alloc_table_3, alloc_table_3, alloc_table_4, };