1/* 2 * AC-3 tables 3 * copyright (c) 2001 Fabrice Bellard 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; 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/audioconvert.h" 28#include "avcodec.h" 29#include "ac3tab.h" 30 31/** 32 * Possible frame sizes. 33 * from ATSC A/52 Table 5.18 Frame Size Code Table. 34 */ 35const 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 */ 80const uint8_t ff_ac3_channels_tab[8] = { 81 2, 1, 2, 3, 3, 4, 4, 5 82}; 83 84/** 85 * Map audio coding mode (acmod) to channel layout mask. 86 */ 87const uint16_t avpriv_ac3_channel_layout_tab[8] = { 88 AV_CH_LAYOUT_STEREO, 89 AV_CH_LAYOUT_MONO, 90 AV_CH_LAYOUT_STEREO, 91 AV_CH_LAYOUT_SURROUND, 92 AV_CH_LAYOUT_2_1, 93 AV_CH_LAYOUT_4POINT0, 94 AV_CH_LAYOUT_2_2, 95 AV_CH_LAYOUT_5POINT0 96}; 97 98#define COMMON_CHANNEL_MAP \ 99 { { 0, 1, }, { 0, 1, 2, } },\ 100 { { 0, }, { 0, 1, } },\ 101 { { 0, 1, }, { 0, 1, 2, } },\ 102 { { 0, 2, 1, }, { 0, 2, 1, 3, } },\ 103 { { 0, 1, 2, }, { 0, 1, 3, 2, } },\ 104 { { 0, 2, 1, 3, }, { 0, 2, 1, 4, 3, } }, 105 106/** 107 * Table to remap channels from SMPTE order to AC-3 order. 108 * [channel_mode][lfe][ch] 109 */ 110const uint8_t ff_ac3_enc_channel_map[8][2][6] = { 111 COMMON_CHANNEL_MAP 112 { { 0, 1, 2, 3, }, { 0, 1, 3, 4, 2, } }, 113 { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 4, 5, 3 } }, 114}; 115 116/** 117 * Table to remap channels from from AC-3 order to SMPTE order. 118 * [channel_mode][lfe][ch] 119 */ 120const uint8_t ff_ac3_dec_channel_map[8][2][6] = { 121 COMMON_CHANNEL_MAP 122 { { 0, 1, 2, 3, }, { 0, 1, 4, 2, 3, } }, 123 { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 5, 3, 4 } }, 124}; 125 126/* possible frequencies */ 127const uint16_t ff_ac3_sample_rate_tab[3] = { 48000, 44100, 32000 }; 128 129/* possible bitrates */ 130const uint16_t ff_ac3_bitrate_tab[19] = { 131 32, 40, 48, 56, 64, 80, 96, 112, 128, 132 160, 192, 224, 256, 320, 384, 448, 512, 576, 640 133}; 134 135/** 136 * Table of bin locations for rematrixing bands 137 * reference: Section 7.5.2 Rematrixing : Frequency Band Definitions 138 */ 139const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 }; 140 141/** 142 * Table E2.16 Default Coupling Banding Structure 143 */ 144const uint8_t ff_eac3_default_cpl_band_struct[18] = { 145 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1 146}; 147 148/* AC-3 MDCT window */ 149 150/* MDCT window */ 151DECLARE_ALIGNED(16, const int16_t, ff_ac3_window)[AC3_WINDOW_SIZE/2] = { 152 4, 7, 12, 16, 21, 28, 34, 42, 153 51, 61, 72, 84, 97, 111, 127, 145, 154 164, 184, 207, 231, 257, 285, 315, 347, 155 382, 419, 458, 500, 544, 591, 641, 694, 156 750, 810, 872, 937, 1007, 1079, 1155, 1235, 157 1318, 1406, 1497, 1593, 1692, 1796, 1903, 2016, 158 2132, 2253, 2379, 2509, 2644, 2783, 2927, 3076, 159 3230, 3389, 3552, 3721, 3894, 4072, 4255, 4444, 160 4637, 4835, 5038, 5246, 5459, 5677, 5899, 6127, 161 6359, 6596, 6837, 7083, 7334, 7589, 7848, 8112, 162 8380, 8652, 8927, 9207, 9491, 9778,10069,10363, 16310660,10960,11264,11570,11879,12190,12504,12820, 16413138,13458,13780,14103,14427,14753,15079,15407, 16515735,16063,16392,16720,17049,17377,17705,18032, 16618358,18683,19007,19330,19651,19970,20287,20602, 16720914,21225,21532,21837,22139,22438,22733,23025, 16823314,23599,23880,24157,24430,24699,24964,25225, 16925481,25732,25979,26221,26459,26691,26919,27142, 17027359,27572,27780,27983,28180,28373,28560,28742, 17128919,29091,29258,29420,29577,29729,29876,30018, 17230155,30288,30415,30538,30657,30771,30880,30985, 17331086,31182,31274,31363,31447,31528,31605,31678, 17431747,31814,31877,31936,31993,32046,32097,32145, 17532190,32232,32272,32310,32345,32378,32409,32438, 17632465,32490,32513,32535,32556,32574,32592,32608, 17732623,32636,32649,32661,32671,32681,32690,32698, 17832705,32712,32718,32724,32729,32733,32737,32741, 17932744,32747,32750,32752,32754,32756,32757,32759, 18032760,32761,32762,32763,32764,32764,32765,32765, 18132766,32766,32766,32766,32767,32767,32767,32767, 18232767,32767,32767,32767,32767,32767,32767,32767, 18332767,32767,32767,32767,32767,32767,32767,32767, 184}; 185 186const uint8_t ff_ac3_log_add_tab[260]= { 1870x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37, 1880x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f, 1890x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27, 1900x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21, 1910x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b, 1920x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16, 1930x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12, 1940x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f, 1950x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c, 1960x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a, 1970x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08, 1980x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06, 1990x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05, 2000x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04, 2010x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03, 2020x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02, 2030x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02, 2040x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01, 2050x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, 2060x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, 2070x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, 2080x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 2090x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 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, 213}; 214 215const uint16_t ff_ac3_hearing_threshold_tab[AC3_CRITICAL_BANDS][3]= { 216{ 0x04d0,0x04f0,0x0580 }, 217{ 0x04d0,0x04f0,0x0580 }, 218{ 0x0440,0x0460,0x04b0 }, 219{ 0x0400,0x0410,0x0450 }, 220{ 0x03e0,0x03e0,0x0420 }, 221{ 0x03c0,0x03d0,0x03f0 }, 222{ 0x03b0,0x03c0,0x03e0 }, 223{ 0x03b0,0x03b0,0x03d0 }, 224{ 0x03a0,0x03b0,0x03c0 }, 225{ 0x03a0,0x03a0,0x03b0 }, 226{ 0x03a0,0x03a0,0x03b0 }, 227{ 0x03a0,0x03a0,0x03b0 }, 228{ 0x03a0,0x03a0,0x03a0 }, 229{ 0x0390,0x03a0,0x03a0 }, 230{ 0x0390,0x0390,0x03a0 }, 231{ 0x0390,0x0390,0x03a0 }, 232{ 0x0380,0x0390,0x03a0 }, 233{ 0x0380,0x0380,0x03a0 }, 234{ 0x0370,0x0380,0x03a0 }, 235{ 0x0370,0x0380,0x03a0 }, 236{ 0x0360,0x0370,0x0390 }, 237{ 0x0360,0x0370,0x0390 }, 238{ 0x0350,0x0360,0x0390 }, 239{ 0x0350,0x0360,0x0390 }, 240{ 0x0340,0x0350,0x0380 }, 241{ 0x0340,0x0350,0x0380 }, 242{ 0x0330,0x0340,0x0380 }, 243{ 0x0320,0x0340,0x0370 }, 244{ 0x0310,0x0320,0x0360 }, 245{ 0x0300,0x0310,0x0350 }, 246{ 0x02f0,0x0300,0x0340 }, 247{ 0x02f0,0x02f0,0x0330 }, 248{ 0x02f0,0x02f0,0x0320 }, 249{ 0x02f0,0x02f0,0x0310 }, 250{ 0x0300,0x02f0,0x0300 }, 251{ 0x0310,0x0300,0x02f0 }, 252{ 0x0340,0x0320,0x02f0 }, 253{ 0x0390,0x0350,0x02f0 }, 254{ 0x03e0,0x0390,0x0300 }, 255{ 0x0420,0x03e0,0x0310 }, 256{ 0x0460,0x0420,0x0330 }, 257{ 0x0490,0x0450,0x0350 }, 258{ 0x04a0,0x04a0,0x03c0 }, 259{ 0x0460,0x0490,0x0410 }, 260{ 0x0440,0x0460,0x0470 }, 261{ 0x0440,0x0440,0x04a0 }, 262{ 0x0520,0x0480,0x0460 }, 263{ 0x0800,0x0630,0x0440 }, 264{ 0x0840,0x0840,0x0450 }, 265{ 0x0840,0x0840,0x04e0 }, 266}; 267 268const uint8_t ff_ac3_bap_tab[64]= { 269 0, 1, 1, 1, 1, 1, 2, 2, 3, 3, 270 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 271 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 272 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 273 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 274 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 275 15, 15, 15, 15, 276}; 277 278const uint8_t ff_ac3_slow_decay_tab[4]={ 279 0x0f, 0x11, 0x13, 0x15, 280}; 281 282const uint8_t ff_ac3_fast_decay_tab[4]={ 283 0x3f, 0x53, 0x67, 0x7b, 284}; 285 286const uint16_t ff_ac3_slow_gain_tab[4]= { 287 0x540, 0x4d8, 0x478, 0x410, 288}; 289 290const uint16_t ff_ac3_db_per_bit_tab[4]= { 291 0x000, 0x700, 0x900, 0xb00, 292}; 293 294const int16_t ff_ac3_floor_tab[8]= { 295 0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800, 296}; 297 298const uint16_t ff_ac3_fast_gain_tab[8]= { 299 0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400, 300}; 301 302/** 303 * Default channel map for a dependent substream defined by acmod 304 */ 305const uint16_t ff_eac3_default_chmap[8] = { 306 AC3_CHMAP_L | AC3_CHMAP_R, // FIXME Ch1+Ch2 307 AC3_CHMAP_C, 308 AC3_CHMAP_L | AC3_CHMAP_R, 309 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R, 310 AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_C_SUR, 311 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_C_SUR, 312 AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR, 313 AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR 314}; 315