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 #include "libavutil/mem_internal.h" 29 30 #include "avcodec.h" 31 #include "ac3tab.h" 32 33 /** 34 * Possible frame sizes. 35 * from ATSC A/52 Table 5.18 Frame Size Code Table. 36 */ 37 const uint16_t ff_ac3_frame_size_tab[38][3] = { 38 { 64, 69, 96 }, 39 { 64, 70, 96 }, 40 { 80, 87, 120 }, 41 { 80, 88, 120 }, 42 { 96, 104, 144 }, 43 { 96, 105, 144 }, 44 { 112, 121, 168 }, 45 { 112, 122, 168 }, 46 { 128, 139, 192 }, 47 { 128, 140, 192 }, 48 { 160, 174, 240 }, 49 { 160, 175, 240 }, 50 { 192, 208, 288 }, 51 { 192, 209, 288 }, 52 { 224, 243, 336 }, 53 { 224, 244, 336 }, 54 { 256, 278, 384 }, 55 { 256, 279, 384 }, 56 { 320, 348, 480 }, 57 { 320, 349, 480 }, 58 { 384, 417, 576 }, 59 { 384, 418, 576 }, 60 { 448, 487, 672 }, 61 { 448, 488, 672 }, 62 { 512, 557, 768 }, 63 { 512, 558, 768 }, 64 { 640, 696, 960 }, 65 { 640, 697, 960 }, 66 { 768, 835, 1152 }, 67 { 768, 836, 1152 }, 68 { 896, 975, 1344 }, 69 { 896, 976, 1344 }, 70 { 1024, 1114, 1536 }, 71 { 1024, 1115, 1536 }, 72 { 1152, 1253, 1728 }, 73 { 1152, 1254, 1728 }, 74 { 1280, 1393, 1920 }, 75 { 1280, 1394, 1920 }, 76 }; 77 78 /** 79 * Map audio coding mode (acmod) to number of full-bandwidth channels. 80 * from ATSC A/52 Table 5.8 Audio Coding Mode 81 */ 82 const uint8_t ff_ac3_channels_tab[8] = { 83 2, 1, 2, 3, 3, 4, 4, 5 84 }; 85 86 /** 87 * Map audio coding mode (acmod) to channel layout mask. 88 */ 89 const uint16_t avpriv_ac3_channel_layout_tab[8] = { 90 AV_CH_LAYOUT_STEREO, 91 AV_CH_LAYOUT_MONO, 92 AV_CH_LAYOUT_STEREO, 93 AV_CH_LAYOUT_SURROUND, 94 AV_CH_LAYOUT_2_1, 95 AV_CH_LAYOUT_4POINT0, 96 AV_CH_LAYOUT_2_2, 97 AV_CH_LAYOUT_5POINT0 98 }; 99 100 /** 101 * Table to remap channels from AC-3 order to SMPTE order. 102 * [channel_mode][lfe][ch] 103 */ 104 const uint8_t ff_ac3_dec_channel_map[8][2][6] = { 105 COMMON_CHANNEL_MAP 106 { { 0, 1, 2, 3, }, { 0, 1, 4, 2, 3, } }, 107 { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 5, 3, 4 } }, 108 }; 109 110 /* possible frequencies */ 111 const int ff_ac3_sample_rate_tab[] = { 48000, 44100, 32000, 0 }; 112 113 /* possible bitrates */ 114 const uint16_t ff_ac3_bitrate_tab[19] = { 115 32, 40, 48, 56, 64, 80, 96, 112, 128, 116 160, 192, 224, 256, 320, 384, 448, 512, 576, 640 117 }; 118 119 /** 120 * Table of bin locations for rematrixing bands 121 * reference: Section 7.5.2 Rematrixing : Frequency Band Definitions 122 */ 123 const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 }; 124 125 /** 126 * Table E2.16 Default Coupling Banding Structure 127 */ 128 const uint8_t ff_eac3_default_cpl_band_struct[18] = { 129 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1 130 }; 131 132 const uint8_t ff_ac3_log_add_tab[260]= { 133 0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37, 134 0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f, 135 0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27, 136 0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21, 137 0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b, 138 0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16, 139 0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12, 140 0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f, 141 0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c, 142 0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a, 143 0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08, 144 0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06, 145 0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05, 146 0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04, 147 0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03, 148 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02, 149 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02, 150 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01, 151 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, 152 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, 153 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, 154 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 155 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 156 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 157 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 158 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 159 }; 160 161 const uint16_t ff_ac3_hearing_threshold_tab[AC3_CRITICAL_BANDS][3]= { 162 { 0x04d0,0x04f0,0x0580 }, 163 { 0x04d0,0x04f0,0x0580 }, 164 { 0x0440,0x0460,0x04b0 }, 165 { 0x0400,0x0410,0x0450 }, 166 { 0x03e0,0x03e0,0x0420 }, 167 { 0x03c0,0x03d0,0x03f0 }, 168 { 0x03b0,0x03c0,0x03e0 }, 169 { 0x03b0,0x03b0,0x03d0 }, 170 { 0x03a0,0x03b0,0x03c0 }, 171 { 0x03a0,0x03a0,0x03b0 }, 172 { 0x03a0,0x03a0,0x03b0 }, 173 { 0x03a0,0x03a0,0x03b0 }, 174 { 0x03a0,0x03a0,0x03a0 }, 175 { 0x0390,0x03a0,0x03a0 }, 176 { 0x0390,0x0390,0x03a0 }, 177 { 0x0390,0x0390,0x03a0 }, 178 { 0x0380,0x0390,0x03a0 }, 179 { 0x0380,0x0380,0x03a0 }, 180 { 0x0370,0x0380,0x03a0 }, 181 { 0x0370,0x0380,0x03a0 }, 182 { 0x0360,0x0370,0x0390 }, 183 { 0x0360,0x0370,0x0390 }, 184 { 0x0350,0x0360,0x0390 }, 185 { 0x0350,0x0360,0x0390 }, 186 { 0x0340,0x0350,0x0380 }, 187 { 0x0340,0x0350,0x0380 }, 188 { 0x0330,0x0340,0x0380 }, 189 { 0x0320,0x0340,0x0370 }, 190 { 0x0310,0x0320,0x0360 }, 191 { 0x0300,0x0310,0x0350 }, 192 { 0x02f0,0x0300,0x0340 }, 193 { 0x02f0,0x02f0,0x0330 }, 194 { 0x02f0,0x02f0,0x0320 }, 195 { 0x02f0,0x02f0,0x0310 }, 196 { 0x0300,0x02f0,0x0300 }, 197 { 0x0310,0x0300,0x02f0 }, 198 { 0x0340,0x0320,0x02f0 }, 199 { 0x0390,0x0350,0x02f0 }, 200 { 0x03e0,0x0390,0x0300 }, 201 { 0x0420,0x03e0,0x0310 }, 202 { 0x0460,0x0420,0x0330 }, 203 { 0x0490,0x0450,0x0350 }, 204 { 0x04a0,0x04a0,0x03c0 }, 205 { 0x0460,0x0490,0x0410 }, 206 { 0x0440,0x0460,0x0470 }, 207 { 0x0440,0x0440,0x04a0 }, 208 { 0x0520,0x0480,0x0460 }, 209 { 0x0800,0x0630,0x0440 }, 210 { 0x0840,0x0840,0x0450 }, 211 { 0x0840,0x0840,0x04e0 }, 212 }; 213 214 const uint8_t ff_ac3_bap_tab[64]= { 215 0, 1, 1, 1, 1, 1, 2, 2, 3, 3, 216 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 217 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 218 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 219 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 220 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 221 15, 15, 15, 15, 222 }; 223 224 const uint8_t ff_ac3_slow_decay_tab[4]={ 225 0x0f, 0x11, 0x13, 0x15, 226 }; 227 228 const uint8_t ff_ac3_fast_decay_tab[4]={ 229 0x3f, 0x53, 0x67, 0x7b, 230 }; 231 232 const uint16_t ff_ac3_slow_gain_tab[4]= { 233 0x540, 0x4d8, 0x478, 0x410, 234 }; 235 236 const uint16_t ff_ac3_db_per_bit_tab[4]= { 237 0x000, 0x700, 0x900, 0xb00, 238 }; 239 240 const int16_t ff_ac3_floor_tab[8]= { 241 0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800, 242 }; 243 244 const uint16_t ff_ac3_fast_gain_tab[8]= { 245 0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400, 246 }; 247 248 const uint64_t ff_eac3_custom_channel_map_locations[16][2] = { 249 { 1, AV_CH_FRONT_LEFT }, 250 { 1, AV_CH_FRONT_CENTER }, 251 { 1, AV_CH_FRONT_RIGHT }, 252 { 1, AV_CH_SIDE_LEFT }, 253 { 1, AV_CH_SIDE_RIGHT }, 254 { 0, AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER }, 255 { 0, AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT }, 256 { 0, AV_CH_BACK_CENTER }, 257 { 0, AV_CH_TOP_CENTER }, 258 { 0, AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT }, 259 { 0, AV_CH_WIDE_LEFT | AV_CH_WIDE_RIGHT }, 260 { 0, AV_CH_TOP_FRONT_LEFT | AV_CH_TOP_FRONT_RIGHT}, 261 { 0, AV_CH_TOP_FRONT_CENTER }, 262 { 0, AV_CH_TOP_BACK_LEFT | AV_CH_TOP_BACK_RIGHT }, 263 { 0, AV_CH_LOW_FREQUENCY_2 }, 264 { 1, AV_CH_LOW_FREQUENCY }, 265 }; 266