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.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 */ 37const 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 */ 82const 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 */ 89const 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#define COMMON_CHANNEL_MAP \ 101 { { 0, 1, }, { 0, 1, 2, } },\ 102 { { 0, }, { 0, 1, } },\ 103 { { 0, 1, }, { 0, 1, 2, } },\ 104 { { 0, 2, 1, }, { 0, 2, 1, 3, } },\ 105 { { 0, 1, 2, }, { 0, 1, 3, 2, } },\ 106 { { 0, 2, 1, 3, }, { 0, 2, 1, 4, 3, } }, 107 108/** 109 * Table to remap channels from SMPTE order to AC-3 order. 110 * [channel_mode][lfe][ch] 111 */ 112const uint8_t ff_ac3_enc_channel_map[8][2][6] = { 113 COMMON_CHANNEL_MAP 114 { { 0, 1, 2, 3, }, { 0, 1, 3, 4, 2, } }, 115 { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 4, 5, 3 } }, 116}; 117 118/** 119 * Table to remap channels from AC-3 order to SMPTE order. 120 * [channel_mode][lfe][ch] 121 */ 122const uint8_t ff_ac3_dec_channel_map[8][2][6] = { 123 COMMON_CHANNEL_MAP 124 { { 0, 1, 2, 3, }, { 0, 1, 4, 2, 3, } }, 125 { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 5, 3, 4 } }, 126}; 127 128/* possible frequencies */ 129const uint16_t ff_ac3_sample_rate_tab[3] = { 48000, 44100, 32000 }; 130 131/* possible bitrates */ 132const uint16_t ff_ac3_bitrate_tab[19] = { 133 32, 40, 48, 56, 64, 80, 96, 112, 128, 134 160, 192, 224, 256, 320, 384, 448, 512, 576, 640 135}; 136 137/** 138 * Table of bin locations for rematrixing bands 139 * reference: Section 7.5.2 Rematrixing : Frequency Band Definitions 140 */ 141const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 }; 142 143/** 144 * Table E2.16 Default Coupling Banding Structure 145 */ 146const uint8_t ff_eac3_default_cpl_band_struct[18] = { 147 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1 148}; 149 150/* AC-3 MDCT window */ 151 152/* MDCT window */ 153DECLARE_ALIGNED(16, const int16_t, ff_ac3_window)[AC3_WINDOW_SIZE/2] = { 154 4, 7, 12, 16, 21, 28, 34, 42, 155 51, 61, 72, 84, 97, 111, 127, 145, 156 164, 184, 207, 231, 257, 285, 315, 347, 157 382, 419, 458, 500, 544, 591, 641, 694, 158 750, 810, 872, 937, 1007, 1079, 1155, 1235, 159 1318, 1406, 1497, 1593, 1692, 1796, 1903, 2016, 160 2132, 2253, 2379, 2509, 2644, 2783, 2927, 3076, 161 3230, 3389, 3552, 3721, 3894, 4072, 4255, 4444, 162 4637, 4835, 5038, 5246, 5459, 5677, 5899, 6127, 163 6359, 6596, 6837, 7083, 7334, 7589, 7848, 8112, 164 8380, 8652, 8927, 9207, 9491, 9778,10069,10363, 16510660,10960,11264,11570,11879,12190,12504,12820, 16613138,13458,13780,14103,14427,14753,15079,15407, 16715735,16063,16392,16720,17049,17377,17705,18032, 16818358,18683,19007,19330,19651,19970,20287,20602, 16920914,21225,21532,21837,22139,22438,22733,23025, 17023314,23599,23880,24157,24430,24699,24964,25225, 17125481,25732,25979,26221,26459,26691,26919,27142, 17227359,27572,27780,27983,28180,28373,28560,28742, 17328919,29091,29258,29420,29577,29729,29876,30018, 17430155,30288,30415,30538,30657,30771,30880,30985, 17531086,31182,31274,31363,31447,31528,31605,31678, 17631747,31814,31877,31936,31993,32046,32097,32145, 17732190,32232,32272,32310,32345,32378,32409,32438, 17832465,32490,32513,32535,32556,32574,32592,32608, 17932623,32636,32649,32661,32671,32681,32690,32698, 18032705,32712,32718,32724,32729,32733,32737,32741, 18132744,32747,32750,32752,32754,32756,32757,32759, 18232760,32761,32762,32763,32764,32764,32765,32765, 18332766,32766,32766,32766,32767,32767,32767,32767, 18432767,32767,32767,32767,32767,32767,32767,32767, 18532767,32767,32767,32767,32767,32767,32767,32767, 186}; 187 188const uint8_t ff_ac3_log_add_tab[260]= { 1890x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37, 1900x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f, 1910x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27, 1920x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21, 1930x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b, 1940x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16, 1950x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12, 1960x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f, 1970x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c, 1980x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a, 1990x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08, 2000x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06, 2010x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05, 2020x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04, 2030x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03, 2040x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02, 2050x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02, 2060x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01, 2070x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, 2080x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, 2090x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, 2100x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 2110x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 2120x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 2130x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 2140x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 215}; 216 217const uint16_t ff_ac3_hearing_threshold_tab[AC3_CRITICAL_BANDS][3]= { 218{ 0x04d0,0x04f0,0x0580 }, 219{ 0x04d0,0x04f0,0x0580 }, 220{ 0x0440,0x0460,0x04b0 }, 221{ 0x0400,0x0410,0x0450 }, 222{ 0x03e0,0x03e0,0x0420 }, 223{ 0x03c0,0x03d0,0x03f0 }, 224{ 0x03b0,0x03c0,0x03e0 }, 225{ 0x03b0,0x03b0,0x03d0 }, 226{ 0x03a0,0x03b0,0x03c0 }, 227{ 0x03a0,0x03a0,0x03b0 }, 228{ 0x03a0,0x03a0,0x03b0 }, 229{ 0x03a0,0x03a0,0x03b0 }, 230{ 0x03a0,0x03a0,0x03a0 }, 231{ 0x0390,0x03a0,0x03a0 }, 232{ 0x0390,0x0390,0x03a0 }, 233{ 0x0390,0x0390,0x03a0 }, 234{ 0x0380,0x0390,0x03a0 }, 235{ 0x0380,0x0380,0x03a0 }, 236{ 0x0370,0x0380,0x03a0 }, 237{ 0x0370,0x0380,0x03a0 }, 238{ 0x0360,0x0370,0x0390 }, 239{ 0x0360,0x0370,0x0390 }, 240{ 0x0350,0x0360,0x0390 }, 241{ 0x0350,0x0360,0x0390 }, 242{ 0x0340,0x0350,0x0380 }, 243{ 0x0340,0x0350,0x0380 }, 244{ 0x0330,0x0340,0x0380 }, 245{ 0x0320,0x0340,0x0370 }, 246{ 0x0310,0x0320,0x0360 }, 247{ 0x0300,0x0310,0x0350 }, 248{ 0x02f0,0x0300,0x0340 }, 249{ 0x02f0,0x02f0,0x0330 }, 250{ 0x02f0,0x02f0,0x0320 }, 251{ 0x02f0,0x02f0,0x0310 }, 252{ 0x0300,0x02f0,0x0300 }, 253{ 0x0310,0x0300,0x02f0 }, 254{ 0x0340,0x0320,0x02f0 }, 255{ 0x0390,0x0350,0x02f0 }, 256{ 0x03e0,0x0390,0x0300 }, 257{ 0x0420,0x03e0,0x0310 }, 258{ 0x0460,0x0420,0x0330 }, 259{ 0x0490,0x0450,0x0350 }, 260{ 0x04a0,0x04a0,0x03c0 }, 261{ 0x0460,0x0490,0x0410 }, 262{ 0x0440,0x0460,0x0470 }, 263{ 0x0440,0x0440,0x04a0 }, 264{ 0x0520,0x0480,0x0460 }, 265{ 0x0800,0x0630,0x0440 }, 266{ 0x0840,0x0840,0x0450 }, 267{ 0x0840,0x0840,0x04e0 }, 268}; 269 270const uint8_t ff_ac3_bap_tab[64]= { 271 0, 1, 1, 1, 1, 1, 2, 2, 3, 3, 272 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 273 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 274 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 275 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 276 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 277 15, 15, 15, 15, 278}; 279 280const uint8_t ff_ac3_slow_decay_tab[4]={ 281 0x0f, 0x11, 0x13, 0x15, 282}; 283 284const uint8_t ff_ac3_fast_decay_tab[4]={ 285 0x3f, 0x53, 0x67, 0x7b, 286}; 287 288const uint16_t ff_ac3_slow_gain_tab[4]= { 289 0x540, 0x4d8, 0x478, 0x410, 290}; 291 292const uint16_t ff_ac3_db_per_bit_tab[4]= { 293 0x000, 0x700, 0x900, 0xb00, 294}; 295 296const int16_t ff_ac3_floor_tab[8]= { 297 0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800, 298}; 299 300const uint16_t ff_ac3_fast_gain_tab[8]= { 301 0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400, 302}; 303 304/** 305 * Default channel map for a dependent substream defined by acmod 306 */ 307const uint16_t ff_eac3_default_chmap[8] = { 308 AC3_CHMAP_L | AC3_CHMAP_R, // FIXME Ch1+Ch2 309 AC3_CHMAP_C, 310 AC3_CHMAP_L | AC3_CHMAP_R, 311 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R, 312 AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_C_SUR, 313 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_C_SUR, 314 AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR, 315 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR 316}; 317