1 /* 2 * AC-3 tables 3 * copyright (c) 2001 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 * tables taken directly from the AC-3 spec. 25 */ 26 27 #include "libavutil/channel_layout.h" 28 29 #include "ac3tab.h" 30 31 /** 32 * Possible frame sizes. 33 * from ATSC A/52 Table 5.18 Frame Size Code Table. 34 */ 35 const uint16_t ff_ac3_frame_size_tab[38][3] = { 36 { 64, 69, 96 }, 37 { 64, 70, 96 }, 38 { 80, 87, 120 }, 39 { 80, 88, 120 }, 40 { 96, 104, 144 }, 41 { 96, 105, 144 }, 42 { 112, 121, 168 }, 43 { 112, 122, 168 }, 44 { 128, 139, 192 }, 45 { 128, 140, 192 }, 46 { 160, 174, 240 }, 47 { 160, 175, 240 }, 48 { 192, 208, 288 }, 49 { 192, 209, 288 }, 50 { 224, 243, 336 }, 51 { 224, 244, 336 }, 52 { 256, 278, 384 }, 53 { 256, 279, 384 }, 54 { 320, 348, 480 }, 55 { 320, 349, 480 }, 56 { 384, 417, 576 }, 57 { 384, 418, 576 }, 58 { 448, 487, 672 }, 59 { 448, 488, 672 }, 60 { 512, 557, 768 }, 61 { 512, 558, 768 }, 62 { 640, 696, 960 }, 63 { 640, 697, 960 }, 64 { 768, 835, 1152 }, 65 { 768, 836, 1152 }, 66 { 896, 975, 1344 }, 67 { 896, 976, 1344 }, 68 { 1024, 1114, 1536 }, 69 { 1024, 1115, 1536 }, 70 { 1152, 1253, 1728 }, 71 { 1152, 1254, 1728 }, 72 { 1280, 1393, 1920 }, 73 { 1280, 1394, 1920 }, 74 }; 75 76 /** 77 * Map audio coding mode (acmod) to number of full-bandwidth channels. 78 * from ATSC A/52 Table 5.8 Audio Coding Mode 79 */ 80 const uint8_t ff_ac3_channels_tab[8] = { 81 2, 1, 2, 3, 3, 4, 4, 5 82 }; 83 84 /** 85 * Table to remap channels from AC-3 order to SMPTE order. 86 * [channel_mode][lfe][ch] 87 */ 88 const uint8_t ff_ac3_dec_channel_map[8][2][6] = { 89 COMMON_CHANNEL_MAP 90 { { 0, 1, 2, 3, }, { 0, 1, 4, 2, 3, } }, 91 { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 5, 3, 4 } }, 92 }; 93 94 /* possible frequencies */ 95 const int ff_ac3_sample_rate_tab[] = { 48000, 44100, 32000, 0 }; 96 97 /* possible bitrates */ 98 const uint16_t ff_ac3_bitrate_tab[19] = { 99 32, 40, 48, 56, 64, 80, 96, 112, 128, 100 160, 192, 224, 256, 320, 384, 448, 512, 576, 640 101 }; 102 103 /** 104 * Table of bin locations for rematrixing bands 105 * reference: Section 7.5.2 Rematrixing : Frequency Band Definitions 106 */ 107 const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 }; 108 109 /** 110 * Table E2.16 Default Coupling Banding Structure 111 */ 112 const uint8_t ff_eac3_default_cpl_band_struct[18] = { 113 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1 114 }; 115 116 const uint8_t ff_ac3_bap_tab[64]= { 117 0, 1, 1, 1, 1, 1, 2, 2, 3, 3, 118 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 119 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 120 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 121 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 122 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 123 15, 15, 15, 15, 124 }; 125 126 const uint8_t ff_ac3_slow_decay_tab[4]={ 127 0x0f, 0x11, 0x13, 0x15, 128 }; 129 130 const uint8_t ff_ac3_fast_decay_tab[4]={ 131 0x3f, 0x53, 0x67, 0x7b, 132 }; 133 134 const uint16_t ff_ac3_slow_gain_tab[4]= { 135 0x540, 0x4d8, 0x478, 0x410, 136 }; 137 138 const uint16_t ff_ac3_db_per_bit_tab[4]= { 139 0x000, 0x700, 0x900, 0xb00, 140 }; 141 142 const int16_t ff_ac3_floor_tab[8]= { 143 0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800, 144 }; 145 146 const uint16_t ff_ac3_fast_gain_tab[8]= { 147 0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400, 148 }; 149 150 const uint64_t ff_eac3_custom_channel_map_locations[16][2] = { 151 { 1, AV_CH_FRONT_LEFT }, 152 { 1, AV_CH_FRONT_CENTER }, 153 { 1, AV_CH_FRONT_RIGHT }, 154 { 1, AV_CH_SIDE_LEFT }, 155 { 1, AV_CH_SIDE_RIGHT }, 156 { 0, AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER }, 157 { 0, AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT }, 158 { 0, AV_CH_BACK_CENTER }, 159 { 0, AV_CH_TOP_CENTER }, 160 { 0, AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT }, 161 { 0, AV_CH_WIDE_LEFT | AV_CH_WIDE_RIGHT }, 162 { 0, AV_CH_TOP_FRONT_LEFT | AV_CH_TOP_FRONT_RIGHT}, 163 { 0, AV_CH_TOP_FRONT_CENTER }, 164 { 0, AV_CH_TOP_BACK_LEFT | AV_CH_TOP_BACK_RIGHT }, 165 { 0, AV_CH_LOW_FREQUENCY_2 }, 166 { 1, AV_CH_LOW_FREQUENCY }, 167 }; 168