libavcodec/ac3tab.c

   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/channel_layout.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  */
  35 const 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  */
  80 const 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  */
  87 const 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  */
 110 const 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  */
 120 const 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 */
 127 const uint16_t ff_ac3_sample_rate_tab[3] = { 48000, 44100, 32000 };
 128
 129 /* possible bitrates */
 130 const 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  */
 139 const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 };
 140
 141 /**
 142  * Table E2.16 Default Coupling Banding Structure
 143  */
 144 const 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 */
 151 DECLARE_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,
 163 10660,10960,11264,11570,11879,12190,12504,12820,
 164 13138,13458,13780,14103,14427,14753,15079,15407,
 165 15735,16063,16392,16720,17049,17377,17705,18032,
 166 18358,18683,19007,19330,19651,19970,20287,20602,
 167 20914,21225,21532,21837,22139,22438,22733,23025,
 168 23314,23599,23880,24157,24430,24699,24964,25225,
 169 25481,25732,25979,26221,26459,26691,26919,27142,
 170 27359,27572,27780,27983,28180,28373,28560,28742,
 171 28919,29091,29258,29420,29577,29729,29876,30018,
 172 30155,30288,30415,30538,30657,30771,30880,30985,
 173 31086,31182,31274,31363,31447,31528,31605,31678,
 174 31747,31814,31877,31936,31993,32046,32097,32145,
 175 32190,32232,32272,32310,32345,32378,32409,32438,
 176 32465,32490,32513,32535,32556,32574,32592,32608,
 177 32623,32636,32649,32661,32671,32681,32690,32698,
 178 32705,32712,32718,32724,32729,32733,32737,32741,
 179 32744,32747,32750,32752,32754,32756,32757,32759,
 180 32760,32761,32762,32763,32764,32764,32765,32765,
 181 32766,32766,32766,32766,32767,32767,32767,32767,
 182 32767,32767,32767,32767,32767,32767,32767,32767,
 183 32767,32767,32767,32767,32767,32767,32767,32767,
 184 };
 185
 186 const uint8_t ff_ac3_log_add_tab[260]= {
 187 0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,
 188 0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f,
 189 0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27,
 190 0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21,
 191 0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,
 192 0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16,
 193 0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12,
 194 0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f,
 195 0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c,
 196 0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a,
 197 0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08,
 198 0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06,
 199 0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05,
 200 0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04,
 201 0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03,
 202 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02,
 203 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
 204 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01,
 205 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
 206 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
 207 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
 208 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 209 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 210 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 211 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 212 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 213 };
 214
 215 const 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
 268 const 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
 278 const uint8_t ff_ac3_slow_decay_tab[4]={
 279     0x0f, 0x11, 0x13, 0x15,
 280 };
 281
 282 const uint8_t ff_ac3_fast_decay_tab[4]={
 283     0x3f, 0x53, 0x67, 0x7b,
 284 };
 285
 286 const uint16_t ff_ac3_slow_gain_tab[4]= {
 287     0x540, 0x4d8, 0x478, 0x410,
 288 };
 289
 290 const uint16_t ff_ac3_db_per_bit_tab[4]= {
 291     0x000, 0x700, 0x900, 0xb00,
 292 };
 293
 294 const int16_t ff_ac3_floor_tab[8]= {
 295     0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
 296 };
 297
 298 const 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  */
 305 const 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 };