libavcodec/ac3tab.c

   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 libavcodec/ac3tab.c
  24  * tables taken directly from the AC-3 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 #define COMMON_CHANNEL_MAP \
  83     { { 0, 1,          }, { 0, 1, 2,         } },\
  84     { { 0,             }, { 0, 1,            } },\
  85     { { 0, 1,          }, { 0, 1, 2,         } },\
  86     { { 0, 2, 1,       }, { 0, 2, 1, 3,      } },\
  87     { { 0, 1, 2,       }, { 0, 1, 3, 2,      } },\
  88     { { 0, 2, 1, 3,    }, { 0, 2, 1, 4, 3,   } },
  89
  90 /**
  91  * Table to remap channels from SMPTE order to AC-3 order.
  92  * [channel_mode][lfe][ch]
  93  */
  94 const uint8_t ff_ac3_enc_channel_map[8][2][6] = {
  95     COMMON_CHANNEL_MAP
  96     { { 0, 1, 2, 3, 4, }, { 0, 1, 3, 4, 2,   } },
  97     { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 4, 5, 3 } },
  98 };
  99
 100 /**
 101  * Table to remap channels from 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, 4, }, { 0, 1, 4, 2, 3,   } },
 107     { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 5, 3, 4 } },
 108 };
 109
 110 /* possible frequencies */
 111 const uint16_t ff_ac3_sample_rate_tab[3] = { 48000, 44100, 32000 };
 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 /* AC-3 MDCT window */
 120
 121 /* MDCT window */
 122 const int16_t ff_ac3_window[256] = {
 123     4,    7,   12,   16,   21,   28,   34,   42,
 124    51,   61,   72,   84,   97,  111,  127,  145,
 125   164,  184,  207,  231,  257,  285,  315,  347,
 126   382,  419,  458,  500,  544,  591,  641,  694,
 127   750,  810,  872,  937, 1007, 1079, 1155, 1235,
 128  1318, 1406, 1497, 1593, 1692, 1796, 1903, 2016,
 129  2132, 2253, 2379, 2509, 2644, 2783, 2927, 3076,
 130  3230, 3389, 3552, 3721, 3894, 4072, 4255, 4444,
 131  4637, 4835, 5038, 5246, 5459, 5677, 5899, 6127,
 132  6359, 6596, 6837, 7083, 7334, 7589, 7848, 8112,
 133  8380, 8652, 8927, 9207, 9491, 9778,10069,10363,
 134 10660,10960,11264,11570,11879,12190,12504,12820,
 135 13138,13458,13780,14103,14427,14753,15079,15407,
 136 15735,16063,16392,16720,17049,17377,17705,18032,
 137 18358,18683,19007,19330,19651,19970,20287,20602,
 138 20914,21225,21532,21837,22139,22438,22733,23025,
 139 23314,23599,23880,24157,24430,24699,24964,25225,
 140 25481,25732,25979,26221,26459,26691,26919,27142,
 141 27359,27572,27780,27983,28180,28373,28560,28742,
 142 28919,29091,29258,29420,29577,29729,29876,30018,
 143 30155,30288,30415,30538,30657,30771,30880,30985,
 144 31086,31182,31274,31363,31447,31528,31605,31678,
 145 31747,31814,31877,31936,31993,32046,32097,32145,
 146 32190,32232,32272,32310,32345,32378,32409,32438,
 147 32465,32490,32513,32535,32556,32574,32592,32608,
 148 32623,32636,32649,32661,32671,32681,32690,32698,
 149 32705,32712,32718,32724,32729,32733,32737,32741,
 150 32744,32747,32750,32752,32754,32756,32757,32759,
 151 32760,32761,32762,32763,32764,32764,32765,32765,
 152 32766,32766,32766,32766,32767,32767,32767,32767,
 153 32767,32767,32767,32767,32767,32767,32767,32767,
 154 32767,32767,32767,32767,32767,32767,32767,32767,
 155 };
 156
 157 const uint8_t ff_ac3_log_add_tab[260]= {
 158 0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,
 159 0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f,
 160 0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27,
 161 0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21,
 162 0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,
 163 0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16,
 164 0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12,
 165 0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f,
 166 0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c,
 167 0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a,
 168 0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08,
 169 0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06,
 170 0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05,
 171 0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04,
 172 0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03,
 173 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02,
 174 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
 175 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01,
 176 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
 177 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
 178 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
 179 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 180 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 181 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 182 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 183 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 184 };
 185
 186 const uint16_t ff_ac3_hearing_threshold_tab[50][3]= {
 187 { 0x04d0,0x04f0,0x0580 },
 188 { 0x04d0,0x04f0,0x0580 },
 189 { 0x0440,0x0460,0x04b0 },
 190 { 0x0400,0x0410,0x0450 },
 191 { 0x03e0,0x03e0,0x0420 },
 192 { 0x03c0,0x03d0,0x03f0 },
 193 { 0x03b0,0x03c0,0x03e0 },
 194 { 0x03b0,0x03b0,0x03d0 },
 195 { 0x03a0,0x03b0,0x03c0 },
 196 { 0x03a0,0x03a0,0x03b0 },
 197 { 0x03a0,0x03a0,0x03b0 },
 198 { 0x03a0,0x03a0,0x03b0 },
 199 { 0x03a0,0x03a0,0x03a0 },
 200 { 0x0390,0x03a0,0x03a0 },
 201 { 0x0390,0x0390,0x03a0 },
 202 { 0x0390,0x0390,0x03a0 },
 203 { 0x0380,0x0390,0x03a0 },
 204 { 0x0380,0x0380,0x03a0 },
 205 { 0x0370,0x0380,0x03a0 },
 206 { 0x0370,0x0380,0x03a0 },
 207 { 0x0360,0x0370,0x0390 },
 208 { 0x0360,0x0370,0x0390 },
 209 { 0x0350,0x0360,0x0390 },
 210 { 0x0350,0x0360,0x0390 },
 211 { 0x0340,0x0350,0x0380 },
 212 { 0x0340,0x0350,0x0380 },
 213 { 0x0330,0x0340,0x0380 },
 214 { 0x0320,0x0340,0x0370 },
 215 { 0x0310,0x0320,0x0360 },
 216 { 0x0300,0x0310,0x0350 },
 217 { 0x02f0,0x0300,0x0340 },
 218 { 0x02f0,0x02f0,0x0330 },
 219 { 0x02f0,0x02f0,0x0320 },
 220 { 0x02f0,0x02f0,0x0310 },
 221 { 0x0300,0x02f0,0x0300 },
 222 { 0x0310,0x0300,0x02f0 },
 223 { 0x0340,0x0320,0x02f0 },
 224 { 0x0390,0x0350,0x02f0 },
 225 { 0x03e0,0x0390,0x0300 },
 226 { 0x0420,0x03e0,0x0310 },
 227 { 0x0460,0x0420,0x0330 },
 228 { 0x0490,0x0450,0x0350 },
 229 { 0x04a0,0x04a0,0x03c0 },
 230 { 0x0460,0x0490,0x0410 },
 231 { 0x0440,0x0460,0x0470 },
 232 { 0x0440,0x0440,0x04a0 },
 233 { 0x0520,0x0480,0x0460 },
 234 { 0x0800,0x0630,0x0440 },
 235 { 0x0840,0x0840,0x0450 },
 236 { 0x0840,0x0840,0x04e0 },
 237 };
 238
 239 const uint8_t ff_ac3_bap_tab[64]= {
 240     0, 1, 1, 1, 1, 1, 2, 2, 3, 3,
 241     3, 4, 4, 5, 5, 6, 6, 6, 6, 7,
 242     7, 7, 7, 8, 8, 8, 8, 9, 9, 9,
 243     9, 10, 10, 10, 10, 11, 11, 11, 11, 12,
 244     12, 12, 12, 13, 13, 13, 13, 14, 14, 14,
 245     14, 14, 14, 14, 14, 15, 15, 15, 15, 15,
 246     15, 15, 15, 15,
 247 };
 248
 249 const uint8_t ff_ac3_slow_decay_tab[4]={
 250     0x0f, 0x11, 0x13, 0x15,
 251 };
 252
 253 const uint8_t ff_ac3_fast_decay_tab[4]={
 254     0x3f, 0x53, 0x67, 0x7b,
 255 };
 256
 257 const uint16_t ff_ac3_slow_gain_tab[4]= {
 258     0x540, 0x4d8, 0x478, 0x410,
 259 };
 260
 261 const uint16_t ff_ac3_db_per_bit_tab[4]= {
 262     0x000, 0x700, 0x900, 0xb00,
 263 };
 264
 265 const int16_t ff_ac3_floor_tab[8]= {
 266     0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
 267 };
 268
 269 const uint16_t ff_ac3_fast_gain_tab[8]= {
 270     0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
 271 };
 272
 273 const uint8_t ff_ac3_critical_band_size_tab[50]={
 274     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
 275     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3,
 276     3, 6, 6, 6, 6, 6, 6, 12, 12, 12, 12, 24, 24, 24, 24, 24
 277 };
 278 /**
 279  * Default channel map for a dependent substream defined by acmod
 280  */
 281 const uint16_t ff_eac3_default_chmap[8] = {
 282     AC3_CHMAP_L |               AC3_CHMAP_R, // FIXME Ch1+Ch2
 283                   AC3_CHMAP_C,
 284     AC3_CHMAP_L |               AC3_CHMAP_R,
 285     AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R,
 286     AC3_CHMAP_L |               AC3_CHMAP_R |                   AC3_CHMAP_C_SUR,
 287     AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R |                   AC3_CHMAP_C_SUR,
 288     AC3_CHMAP_L |               AC3_CHMAP_R | AC3_CHMAP_L_SUR |                  AC3_CHMAP_R_SUR,
 289     AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_L_SUR |                  AC3_CHMAP_R_SUR
 290 };