libavcodec/ac3tab.c

   1 /*
   2  * AC3 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 ac3tab.c
  24  * tables taken directly from AC3 spec.
  25  */
  26
  27 #include "ac3tab.h"
  28
  29 /**
  30  * Possible frame sizes.
  31  * from ATSC A/52 Table 5.18 Frame Size Code Table.
  32  */
  33 const uint16_t ff_ac3_frame_size_tab[38][3] = {
  34     { 64,   69,   96   },
  35     { 64,   70,   96   },
  36     { 80,   87,   120  },
  37     { 80,   88,   120  },
  38     { 96,   104,  144  },
  39     { 96,   105,  144  },
  40     { 112,  121,  168  },
  41     { 112,  122,  168  },
  42     { 128,  139,  192  },
  43     { 128,  140,  192  },
  44     { 160,  174,  240  },
  45     { 160,  175,  240  },
  46     { 192,  208,  288  },
  47     { 192,  209,  288  },
  48     { 224,  243,  336  },
  49     { 224,  244,  336  },
  50     { 256,  278,  384  },
  51     { 256,  279,  384  },
  52     { 320,  348,  480  },
  53     { 320,  349,  480  },
  54     { 384,  417,  576  },
  55     { 384,  418,  576  },
  56     { 448,  487,  672  },
  57     { 448,  488,  672  },
  58     { 512,  557,  768  },
  59     { 512,  558,  768  },
  60     { 640,  696,  960  },
  61     { 640,  697,  960  },
  62     { 768,  835,  1152 },
  63     { 768,  836,  1152 },
  64     { 896,  975,  1344 },
  65     { 896,  976,  1344 },
  66     { 1024, 1114, 1536 },
  67     { 1024, 1115, 1536 },
  68     { 1152, 1253, 1728 },
  69     { 1152, 1254, 1728 },
  70     { 1280, 1393, 1920 },
  71     { 1280, 1394, 1920 },
  72 };
  73
  74 /**
  75  * Maps audio coding mode (acmod) to number of full-bandwidth channels.
  76  * from ATSC A/52 Table 5.8 Audio Coding Mode
  77  */
  78 const uint8_t ff_ac3_channels_tab[8] = {
  79     2, 1, 2, 3, 3, 4, 4, 5
  80 };
  81
  82 /* possible frequencies */
  83 const uint16_t ff_ac3_sample_rate_tab[3] = { 48000, 44100, 32000 };
  84
  85 /* possible bitrates */
  86 const uint16_t ff_ac3_bitrate_tab[19] = {
  87     32, 40, 48, 56, 64, 80, 96, 112, 128,
  88     160, 192, 224, 256, 320, 384, 448, 512, 576, 640
  89 };
  90
  91 /* AC3 MDCT window */
  92
  93 /* MDCT window */
  94 const int16_t ff_ac3_window[256] = {
  95     4,    7,   12,   16,   21,   28,   34,   42,
  96    51,   61,   72,   84,   97,  111,  127,  145,
  97   164,  184,  207,  231,  257,  285,  315,  347,
  98   382,  419,  458,  500,  544,  591,  641,  694,
  99   750,  810,  872,  937, 1007, 1079, 1155, 1235,
 100  1318, 1406, 1497, 1593, 1692, 1796, 1903, 2016,
 101  2132, 2253, 2379, 2509, 2644, 2783, 2927, 3076,
 102  3230, 3389, 3552, 3721, 3894, 4072, 4255, 4444,
 103  4637, 4835, 5038, 5246, 5459, 5677, 5899, 6127,
 104  6359, 6596, 6837, 7083, 7334, 7589, 7848, 8112,
 105  8380, 8652, 8927, 9207, 9491, 9778,10069,10363,
 106 10660,10960,11264,11570,11879,12190,12504,12820,
 107 13138,13458,13780,14103,14427,14753,15079,15407,
 108 15735,16063,16392,16720,17049,17377,17705,18032,
 109 18358,18683,19007,19330,19651,19970,20287,20602,
 110 20914,21225,21532,21837,22139,22438,22733,23025,
 111 23314,23599,23880,24157,24430,24699,24964,25225,
 112 25481,25732,25979,26221,26459,26691,26919,27142,
 113 27359,27572,27780,27983,28180,28373,28560,28742,
 114 28919,29091,29258,29420,29577,29729,29876,30018,
 115 30155,30288,30415,30538,30657,30771,30880,30985,
 116 31086,31182,31274,31363,31447,31528,31605,31678,
 117 31747,31814,31877,31936,31993,32046,32097,32145,
 118 32190,32232,32272,32310,32345,32378,32409,32438,
 119 32465,32490,32513,32535,32556,32574,32592,32608,
 120 32623,32636,32649,32661,32671,32681,32690,32698,
 121 32705,32712,32718,32724,32729,32733,32737,32741,
 122 32744,32747,32750,32752,32754,32756,32757,32759,
 123 32760,32761,32762,32763,32764,32764,32765,32765,
 124 32766,32766,32766,32766,32767,32767,32767,32767,
 125 32767,32767,32767,32767,32767,32767,32767,32767,
 126 32767,32767,32767,32767,32767,32767,32767,32767,
 127 };
 128
 129 const uint8_t ff_ac3_log_add_tab[260]= {
 130 0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,
 131 0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f,
 132 0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27,
 133 0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21,
 134 0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,
 135 0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16,
 136 0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12,
 137 0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f,
 138 0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c,
 139 0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a,
 140 0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08,
 141 0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06,
 142 0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05,
 143 0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04,
 144 0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03,
 145 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02,
 146 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
 147 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01,
 148 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
 149 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
 150 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
 151 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 152 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 153 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 154 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 155 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 156 };
 157
 158 const uint16_t ff_ac3_hearing_threshold_tab[50][3]= {
 159 { 0x04d0,0x04f0,0x0580 },
 160 { 0x04d0,0x04f0,0x0580 },
 161 { 0x0440,0x0460,0x04b0 },
 162 { 0x0400,0x0410,0x0450 },
 163 { 0x03e0,0x03e0,0x0420 },
 164 { 0x03c0,0x03d0,0x03f0 },
 165 { 0x03b0,0x03c0,0x03e0 },
 166 { 0x03b0,0x03b0,0x03d0 },
 167 { 0x03a0,0x03b0,0x03c0 },
 168 { 0x03a0,0x03a0,0x03b0 },
 169 { 0x03a0,0x03a0,0x03b0 },
 170 { 0x03a0,0x03a0,0x03b0 },
 171 { 0x03a0,0x03a0,0x03a0 },
 172 { 0x0390,0x03a0,0x03a0 },
 173 { 0x0390,0x0390,0x03a0 },
 174 { 0x0390,0x0390,0x03a0 },
 175 { 0x0380,0x0390,0x03a0 },
 176 { 0x0380,0x0380,0x03a0 },
 177 { 0x0370,0x0380,0x03a0 },
 178 { 0x0370,0x0380,0x03a0 },
 179 { 0x0360,0x0370,0x0390 },
 180 { 0x0360,0x0370,0x0390 },
 181 { 0x0350,0x0360,0x0390 },
 182 { 0x0350,0x0360,0x0390 },
 183 { 0x0340,0x0350,0x0380 },
 184 { 0x0340,0x0350,0x0380 },
 185 { 0x0330,0x0340,0x0380 },
 186 { 0x0320,0x0340,0x0370 },
 187 { 0x0310,0x0320,0x0360 },
 188 { 0x0300,0x0310,0x0350 },
 189 { 0x02f0,0x0300,0x0340 },
 190 { 0x02f0,0x02f0,0x0330 },
 191 { 0x02f0,0x02f0,0x0320 },
 192 { 0x02f0,0x02f0,0x0310 },
 193 { 0x0300,0x02f0,0x0300 },
 194 { 0x0310,0x0300,0x02f0 },
 195 { 0x0340,0x0320,0x02f0 },
 196 { 0x0390,0x0350,0x02f0 },
 197 { 0x03e0,0x0390,0x0300 },
 198 { 0x0420,0x03e0,0x0310 },
 199 { 0x0460,0x0420,0x0330 },
 200 { 0x0490,0x0450,0x0350 },
 201 { 0x04a0,0x04a0,0x03c0 },
 202 { 0x0460,0x0490,0x0410 },
 203 { 0x0440,0x0460,0x0470 },
 204 { 0x0440,0x0440,0x04a0 },
 205 { 0x0520,0x0480,0x0460 },
 206 { 0x0800,0x0630,0x0440 },
 207 { 0x0840,0x0840,0x0450 },
 208 { 0x0840,0x0840,0x04e0 },
 209 };
 210
 211 const uint8_t ff_ac3_bap_tab[64]= {
 212     0, 1, 1, 1, 1, 1, 2, 2, 3, 3,
 213     3, 4, 4, 5, 5, 6, 6, 6, 6, 7,
 214     7, 7, 7, 8, 8, 8, 8, 9, 9, 9,
 215     9, 10, 10, 10, 10, 11, 11, 11, 11, 12,
 216     12, 12, 12, 13, 13, 13, 13, 14, 14, 14,
 217     14, 14, 14, 14, 14, 15, 15, 15, 15, 15,
 218     15, 15, 15, 15,
 219 };
 220
 221 const uint8_t ff_ac3_slow_decay_tab[4]={
 222     0x0f, 0x11, 0x13, 0x15,
 223 };
 224
 225 const uint8_t ff_ac3_fast_decay_tab[4]={
 226     0x3f, 0x53, 0x67, 0x7b,
 227 };
 228
 229 const uint16_t ff_ac3_slow_gain_tab[4]= {
 230     0x540, 0x4d8, 0x478, 0x410,
 231 };
 232
 233 const uint16_t ff_ac3_db_per_bit_tab[4]= {
 234     0x000, 0x700, 0x900, 0xb00,
 235 };
 236
 237 const int16_t ff_ac3_floor_tab[8]= {
 238     0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
 239 };
 240
 241 const uint16_t ff_ac3_fast_gain_tab[8]= {
 242     0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
 243 };
 244
 245 const uint8_t ff_ac3_critical_band_size_tab[50]={
 246     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
 247     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3,
 248     3, 6, 6, 6, 6, 6, 6, 12, 12, 12, 12, 24, 24, 24, 24, 24
 249 };
 250 /**
 251  * Default channel map for a dependent substream defined by acmod
 252  */
 253 const uint16_t ff_eac3_default_chmap[8] = {
 254     AC3_CHMAP_L |               AC3_CHMAP_R, // FIXME Ch1+Ch2
 255                   AC3_CHMAP_C,
 256     AC3_CHMAP_L |               AC3_CHMAP_R,
 257     AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R,
 258     AC3_CHMAP_L |               AC3_CHMAP_R |                   AC3_CHMAP_C_SUR,
 259     AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R |                   AC3_CHMAP_C_SUR,
 260     AC3_CHMAP_L |               AC3_CHMAP_R | AC3_CHMAP_L_SUR |                  AC3_CHMAP_R_SUR,
 261     AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_L_SUR |                  AC3_CHMAP_R_SUR
 262 };