mpegaudiodata.c (4213B)
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 #include "mpegaudiodata.h" 28 29 /*******************************************************/ 30 /* layer 2 tables */ 31 32 const int ff_mpa_sblimit_table[5] = { 27 , 30 , 8, 12 , 30 }; 33 34 const int ff_mpa_quant_steps[17] = { 35 3, 5, 7, 9, 15, 36 31, 63, 127, 255, 511, 37 1023, 2047, 4095, 8191, 16383, 38 32767, 65535 39 }; 40 41 /* we use a negative value if grouped */ 42 const int ff_mpa_quant_bits[17] = { 43 -5, -7, 3, -10, 4, 44 5, 6, 7, 8, 9, 45 10, 11, 12, 13, 14, 46 15, 16 47 }; 48 49 /* encoding tables which give the quantization index. Note how it is 50 possible to store them efficiently ! */ 51 static const unsigned char alloc_table_1[] = { 52 4, 0, 2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 53 4, 0, 2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 54 4, 0, 2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 55 4, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 56 4, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 57 4, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 58 4, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 59 4, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 60 4, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 61 4, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 62 4, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 63 3, 0, 1, 2, 3, 4, 5, 16, 64 3, 0, 1, 2, 3, 4, 5, 16, 65 3, 0, 1, 2, 3, 4, 5, 16, 66 3, 0, 1, 2, 3, 4, 5, 16, 67 3, 0, 1, 2, 3, 4, 5, 16, 68 3, 0, 1, 2, 3, 4, 5, 16, 69 3, 0, 1, 2, 3, 4, 5, 16, 70 3, 0, 1, 2, 3, 4, 5, 16, 71 3, 0, 1, 2, 3, 4, 5, 16, 72 3, 0, 1, 2, 3, 4, 5, 16, 73 3, 0, 1, 2, 3, 4, 5, 16, 74 3, 0, 1, 2, 3, 4, 5, 16, 75 2, 0, 1, 16, 76 2, 0, 1, 16, 77 2, 0, 1, 16, 78 2, 0, 1, 16, 79 2, 0, 1, 16, 80 2, 0, 1, 16, 81 2, 0, 1, 16, 82 }; 83 84 static const unsigned char alloc_table_3[] = { 85 4, 0, 1, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 86 4, 0, 1, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 87 3, 0, 1, 3, 4, 5, 6, 7, 88 3, 0, 1, 3, 4, 5, 6, 7, 89 3, 0, 1, 3, 4, 5, 6, 7, 90 3, 0, 1, 3, 4, 5, 6, 7, 91 3, 0, 1, 3, 4, 5, 6, 7, 92 3, 0, 1, 3, 4, 5, 6, 7, 93 3, 0, 1, 3, 4, 5, 6, 7, 94 3, 0, 1, 3, 4, 5, 6, 7, 95 3, 0, 1, 3, 4, 5, 6, 7, 96 3, 0, 1, 3, 4, 5, 6, 7, 97 }; 98 99 static const unsigned char alloc_table_4[] = { 100 4, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 101 4, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 102 4, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 103 4, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 104 3, 0, 1, 3, 4, 5, 6, 7, 105 3, 0, 1, 3, 4, 5, 6, 7, 106 3, 0, 1, 3, 4, 5, 6, 7, 107 3, 0, 1, 3, 4, 5, 6, 7, 108 3, 0, 1, 3, 4, 5, 6, 7, 109 3, 0, 1, 3, 4, 5, 6, 7, 110 3, 0, 1, 3, 4, 5, 6, 7, 111 2, 0, 1, 3, 112 2, 0, 1, 3, 113 2, 0, 1, 3, 114 2, 0, 1, 3, 115 2, 0, 1, 3, 116 2, 0, 1, 3, 117 2, 0, 1, 3, 118 2, 0, 1, 3, 119 2, 0, 1, 3, 120 2, 0, 1, 3, 121 2, 0, 1, 3, 122 2, 0, 1, 3, 123 2, 0, 1, 3, 124 2, 0, 1, 3, 125 2, 0, 1, 3, 126 2, 0, 1, 3, 127 2, 0, 1, 3, 128 2, 0, 1, 3, 129 2, 0, 1, 3, 130 }; 131 132 const unsigned char * const ff_mpa_alloc_tables[5] = 133 { alloc_table_1, alloc_table_1, alloc_table_3, alloc_table_3, alloc_table_4, };