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 "avcodec.h" 28#include "ac3tab.h" 29 30/** 31 * Possible frame sizes. 32 * from ATSC A/52 Table 5.18 Frame Size Code Table. 33 */ 34const uint16_t ff_ac3_frame_size_tab[38][3] = { 35 { 64, 69, 96 }, 36 { 64, 70, 96 }, 37 { 80, 87, 120 }, 38 { 80, 88, 120 }, 39 { 96, 104, 144 }, 40 { 96, 105, 144 }, 41 { 112, 121, 168 }, 42 { 112, 122, 168 }, 43 { 128, 139, 192 }, 44 { 128, 140, 192 }, 45 { 160, 174, 240 }, 46 { 160, 175, 240 }, 47 { 192, 208, 288 }, 48 { 192, 209, 288 }, 49 { 224, 243, 336 }, 50 { 224, 244, 336 }, 51 { 256, 278, 384 }, 52 { 256, 279, 384 }, 53 { 320, 348, 480 }, 54 { 320, 349, 480 }, 55 { 384, 417, 576 }, 56 { 384, 418, 576 }, 57 { 448, 487, 672 }, 58 { 448, 488, 672 }, 59 { 512, 557, 768 }, 60 { 512, 558, 768 }, 61 { 640, 696, 960 }, 62 { 640, 697, 960 }, 63 { 768, 835, 1152 }, 64 { 768, 836, 1152 }, 65 { 896, 975, 1344 }, 66 { 896, 976, 1344 }, 67 { 1024, 1114, 1536 }, 68 { 1024, 1115, 1536 }, 69 { 1152, 1253, 1728 }, 70 { 1152, 1254, 1728 }, 71 { 1280, 1393, 1920 }, 72 { 1280, 1394, 1920 }, 73}; 74 75/** 76 * Maps audio coding mode (acmod) to number of full-bandwidth channels. 77 * from ATSC A/52 Table 5.8 Audio Coding Mode 78 */ 79const uint8_t ff_ac3_channels_tab[8] = { 80 2, 1, 2, 3, 3, 4, 4, 5 81}; 82 83/** 84 * Maps audio coding mode (acmod) to channel layout mask. 85 */ 86const uint16_t ff_ac3_channel_layout_tab[8] = { 87 CH_LAYOUT_STEREO, 88 CH_LAYOUT_MONO, 89 CH_LAYOUT_STEREO, 90 CH_LAYOUT_SURROUND, 91 CH_LAYOUT_2_1, 92 CH_LAYOUT_4POINT0, 93 CH_LAYOUT_2_2, 94 CH_LAYOUT_5POINT0 95}; 96 97#define COMMON_CHANNEL_MAP \ 98 { { 0, 1, }, { 0, 1, 2, } },\ 99 { { 0, }, { 0, 1, } },\ 100 { { 0, 1, }, { 0, 1, 2, } },\ 101 { { 0, 2, 1, }, { 0, 2, 1, 3, } },\ 102 { { 0, 1, 2, }, { 0, 1, 3, 2, } },\ 103 { { 0, 2, 1, 3, }, { 0, 2, 1, 4, 3, } }, 104 105/** 106 * Table to remap channels from SMPTE order to AC-3 order. 107 * [channel_mode][lfe][ch] 108 */ 109const uint8_t ff_ac3_enc_channel_map[8][2][6] = { 110 COMMON_CHANNEL_MAP 111 { { 0, 1, 2, 3, }, { 0, 1, 3, 4, 2, } }, 112 { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 4, 5, 3 } }, 113}; 114 115/** 116 * Table to remap channels from from AC-3 order to SMPTE order. 117 * [channel_mode][lfe][ch] 118 */ 119const uint8_t ff_ac3_dec_channel_map[8][2][6] = { 120 COMMON_CHANNEL_MAP 121 { { 0, 1, 2, 3, }, { 0, 1, 4, 2, 3, } }, 122 { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 5, 3, 4 } }, 123}; 124 125/* possible frequencies */ 126const uint16_t ff_ac3_sample_rate_tab[3] = { 48000, 44100, 32000 }; 127 128/* possible bitrates */ 129const uint16_t ff_ac3_bitrate_tab[19] = { 130 32, 40, 48, 56, 64, 80, 96, 112, 128, 131 160, 192, 224, 256, 320, 384, 448, 512, 576, 640 132}; 133 134/* AC-3 MDCT window */ 135 136/* MDCT window */ 137const int16_t ff_ac3_window[256] = { 138 4, 7, 12, 16, 21, 28, 34, 42, 139 51, 61, 72, 84, 97, 111, 127, 145, 140 164, 184, 207, 231, 257, 285, 315, 347, 141 382, 419, 458, 500, 544, 591, 641, 694, 142 750, 810, 872, 937, 1007, 1079, 1155, 1235, 143 1318, 1406, 1497, 1593, 1692, 1796, 1903, 2016, 144 2132, 2253, 2379, 2509, 2644, 2783, 2927, 3076, 145 3230, 3389, 3552, 3721, 3894, 4072, 4255, 4444, 146 4637, 4835, 5038, 5246, 5459, 5677, 5899, 6127, 147 6359, 6596, 6837, 7083, 7334, 7589, 7848, 8112, 148 8380, 8652, 8927, 9207, 9491, 9778,10069,10363, 14910660,10960,11264,11570,11879,12190,12504,12820, 15013138,13458,13780,14103,14427,14753,15079,15407, 15115735,16063,16392,16720,17049,17377,17705,18032, 15218358,18683,19007,19330,19651,19970,20287,20602, 15320914,21225,21532,21837,22139,22438,22733,23025, 15423314,23599,23880,24157,24430,24699,24964,25225, 15525481,25732,25979,26221,26459,26691,26919,27142, 15627359,27572,27780,27983,28180,28373,28560,28742, 15728919,29091,29258,29420,29577,29729,29876,30018, 15830155,30288,30415,30538,30657,30771,30880,30985, 15931086,31182,31274,31363,31447,31528,31605,31678, 16031747,31814,31877,31936,31993,32046,32097,32145, 16132190,32232,32272,32310,32345,32378,32409,32438, 16232465,32490,32513,32535,32556,32574,32592,32608, 16332623,32636,32649,32661,32671,32681,32690,32698, 16432705,32712,32718,32724,32729,32733,32737,32741, 16532744,32747,32750,32752,32754,32756,32757,32759, 16632760,32761,32762,32763,32764,32764,32765,32765, 16732766,32766,32766,32766,32767,32767,32767,32767, 16832767,32767,32767,32767,32767,32767,32767,32767, 16932767,32767,32767,32767,32767,32767,32767,32767, 170}; 171 172const uint8_t ff_ac3_log_add_tab[260]= { 1730x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37, 1740x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f, 1750x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27, 1760x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21, 1770x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b, 1780x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16, 1790x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12, 1800x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f, 1810x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c, 1820x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a, 1830x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08, 1840x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06, 1850x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05, 1860x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04, 1870x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03, 1880x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02, 1890x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02, 1900x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01, 1910x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, 1920x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, 1930x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, 1940x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1950x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1960x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1970x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1980x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 199}; 200 201const uint16_t ff_ac3_hearing_threshold_tab[50][3]= { 202{ 0x04d0,0x04f0,0x0580 }, 203{ 0x04d0,0x04f0,0x0580 }, 204{ 0x0440,0x0460,0x04b0 }, 205{ 0x0400,0x0410,0x0450 }, 206{ 0x03e0,0x03e0,0x0420 }, 207{ 0x03c0,0x03d0,0x03f0 }, 208{ 0x03b0,0x03c0,0x03e0 }, 209{ 0x03b0,0x03b0,0x03d0 }, 210{ 0x03a0,0x03b0,0x03c0 }, 211{ 0x03a0,0x03a0,0x03b0 }, 212{ 0x03a0,0x03a0,0x03b0 }, 213{ 0x03a0,0x03a0,0x03b0 }, 214{ 0x03a0,0x03a0,0x03a0 }, 215{ 0x0390,0x03a0,0x03a0 }, 216{ 0x0390,0x0390,0x03a0 }, 217{ 0x0390,0x0390,0x03a0 }, 218{ 0x0380,0x0390,0x03a0 }, 219{ 0x0380,0x0380,0x03a0 }, 220{ 0x0370,0x0380,0x03a0 }, 221{ 0x0370,0x0380,0x03a0 }, 222{ 0x0360,0x0370,0x0390 }, 223{ 0x0360,0x0370,0x0390 }, 224{ 0x0350,0x0360,0x0390 }, 225{ 0x0350,0x0360,0x0390 }, 226{ 0x0340,0x0350,0x0380 }, 227{ 0x0340,0x0350,0x0380 }, 228{ 0x0330,0x0340,0x0380 }, 229{ 0x0320,0x0340,0x0370 }, 230{ 0x0310,0x0320,0x0360 }, 231{ 0x0300,0x0310,0x0350 }, 232{ 0x02f0,0x0300,0x0340 }, 233{ 0x02f0,0x02f0,0x0330 }, 234{ 0x02f0,0x02f0,0x0320 }, 235{ 0x02f0,0x02f0,0x0310 }, 236{ 0x0300,0x02f0,0x0300 }, 237{ 0x0310,0x0300,0x02f0 }, 238{ 0x0340,0x0320,0x02f0 }, 239{ 0x0390,0x0350,0x02f0 }, 240{ 0x03e0,0x0390,0x0300 }, 241{ 0x0420,0x03e0,0x0310 }, 242{ 0x0460,0x0420,0x0330 }, 243{ 0x0490,0x0450,0x0350 }, 244{ 0x04a0,0x04a0,0x03c0 }, 245{ 0x0460,0x0490,0x0410 }, 246{ 0x0440,0x0460,0x0470 }, 247{ 0x0440,0x0440,0x04a0 }, 248{ 0x0520,0x0480,0x0460 }, 249{ 0x0800,0x0630,0x0440 }, 250{ 0x0840,0x0840,0x0450 }, 251{ 0x0840,0x0840,0x04e0 }, 252}; 253 254const uint8_t ff_ac3_bap_tab[64]= { 255 0, 1, 1, 1, 1, 1, 2, 2, 3, 3, 256 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 257 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 258 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 259 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 260 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 261 15, 15, 15, 15, 262}; 263 264const uint8_t ff_ac3_slow_decay_tab[4]={ 265 0x0f, 0x11, 0x13, 0x15, 266}; 267 268const uint8_t ff_ac3_fast_decay_tab[4]={ 269 0x3f, 0x53, 0x67, 0x7b, 270}; 271 272const uint16_t ff_ac3_slow_gain_tab[4]= { 273 0x540, 0x4d8, 0x478, 0x410, 274}; 275 276const uint16_t ff_ac3_db_per_bit_tab[4]= { 277 0x000, 0x700, 0x900, 0xb00, 278}; 279 280const int16_t ff_ac3_floor_tab[8]= { 281 0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800, 282}; 283 284const uint16_t ff_ac3_fast_gain_tab[8]= { 285 0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400, 286}; 287 288const uint8_t ff_ac3_critical_band_size_tab[50]={ 289 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 290 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 291 3, 6, 6, 6, 6, 6, 6, 12, 12, 12, 12, 24, 24, 24, 24, 24 292}; 293/** 294 * Default channel map for a dependent substream defined by acmod 295 */ 296const uint16_t ff_eac3_default_chmap[8] = { 297 AC3_CHMAP_L | AC3_CHMAP_R, // FIXME Ch1+Ch2 298 AC3_CHMAP_C, 299 AC3_CHMAP_L | AC3_CHMAP_R, 300 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R, 301 AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_C_SUR, 302 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_C_SUR, 303 AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR, 304 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR 305}; 306