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 "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  */
  34 const 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  */
  79 const 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  */
  86 const 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  */
 109 const 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  */
 119 const 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 */
 126 const uint16_t ff_ac3_sample_rate_tab[3] = { 48000, 44100, 32000 };
 127
 128 /* possible bitrates */
 129 const 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 */
 137 const 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,
 149 10660,10960,11264,11570,11879,12190,12504,12820,
 150 13138,13458,13780,14103,14427,14753,15079,15407,
 151 15735,16063,16392,16720,17049,17377,17705,18032,
 152 18358,18683,19007,19330,19651,19970,20287,20602,
 153 20914,21225,21532,21837,22139,22438,22733,23025,
 154 23314,23599,23880,24157,24430,24699,24964,25225,
 155 25481,25732,25979,26221,26459,26691,26919,27142,
 156 27359,27572,27780,27983,28180,28373,28560,28742,
 157 28919,29091,29258,29420,29577,29729,29876,30018,
 158 30155,30288,30415,30538,30657,30771,30880,30985,
 159 31086,31182,31274,31363,31447,31528,31605,31678,
 160 31747,31814,31877,31936,31993,32046,32097,32145,
 161 32190,32232,32272,32310,32345,32378,32409,32438,
 162 32465,32490,32513,32535,32556,32574,32592,32608,
 163 32623,32636,32649,32661,32671,32681,32690,32698,
 164 32705,32712,32718,32724,32729,32733,32737,32741,
 165 32744,32747,32750,32752,32754,32756,32757,32759,
 166 32760,32761,32762,32763,32764,32764,32765,32765,
 167 32766,32766,32766,32766,32767,32767,32767,32767,
 168 32767,32767,32767,32767,32767,32767,32767,32767,
 169 32767,32767,32767,32767,32767,32767,32767,32767,
 170 };
 171
 172 const uint8_t ff_ac3_log_add_tab[260]= {
 173 0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,
 174 0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f,
 175 0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27,
 176 0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21,
 177 0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,
 178 0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16,
 179 0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12,
 180 0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f,
 181 0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c,
 182 0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a,
 183 0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08,
 184 0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06,
 185 0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05,
 186 0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04,
 187 0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03,
 188 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02,
 189 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
 190 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01,
 191 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
 192 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
 193 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
 194 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 195 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 196 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 197 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 198 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 199 };
 200
 201 const 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
 254 const 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
 264 const uint8_t ff_ac3_slow_decay_tab[4]={
 265     0x0f, 0x11, 0x13, 0x15,
 266 };
 267
 268 const uint8_t ff_ac3_fast_decay_tab[4]={
 269     0x3f, 0x53, 0x67, 0x7b,
 270 };
 271
 272 const uint16_t ff_ac3_slow_gain_tab[4]= {
 273     0x540, 0x4d8, 0x478, 0x410,
 274 };
 275
 276 const uint16_t ff_ac3_db_per_bit_tab[4]= {
 277     0x000, 0x700, 0x900, 0xb00,
 278 };
 279
 280 const int16_t ff_ac3_floor_tab[8]= {
 281     0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
 282 };
 283
 284 const uint16_t ff_ac3_fast_gain_tab[8]= {
 285     0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
 286 };
 287
 288 const 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  */
 296 const 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 };