ffmpeg/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
  24  * tables taken directly from the AC-3 spec.
  25  */
  26
  27 #include "libavutil/channel_layout.h"
  28 #include "libavutil/mem.h"
  29
  30 #include "avcodec.h"
  31 #include "ac3tab.h"
  32
  33 /**
  34  * Possible frame sizes.
  35  * from ATSC A/52 Table 5.18 Frame Size Code Table.
  36  */
  37 const uint16_t ff_ac3_frame_size_tab[38][3] = {
  38     { 64,   69,   96   },
  39     { 64,   70,   96   },
  40     { 80,   87,   120  },
  41     { 80,   88,   120  },
  42     { 96,   104,  144  },
  43     { 96,   105,  144  },
  44     { 112,  121,  168  },
  45     { 112,  122,  168  },
  46     { 128,  139,  192  },
  47     { 128,  140,  192  },
  48     { 160,  174,  240  },
  49     { 160,  175,  240  },
  50     { 192,  208,  288  },
  51     { 192,  209,  288  },
  52     { 224,  243,  336  },
  53     { 224,  244,  336  },
  54     { 256,  278,  384  },
  55     { 256,  279,  384  },
  56     { 320,  348,  480  },
  57     { 320,  349,  480  },
  58     { 384,  417,  576  },
  59     { 384,  418,  576  },
  60     { 448,  487,  672  },
  61     { 448,  488,  672  },
  62     { 512,  557,  768  },
  63     { 512,  558,  768  },
  64     { 640,  696,  960  },
  65     { 640,  697,  960  },
  66     { 768,  835,  1152 },
  67     { 768,  836,  1152 },
  68     { 896,  975,  1344 },
  69     { 896,  976,  1344 },
  70     { 1024, 1114, 1536 },
  71     { 1024, 1115, 1536 },
  72     { 1152, 1253, 1728 },
  73     { 1152, 1254, 1728 },
  74     { 1280, 1393, 1920 },
  75     { 1280, 1394, 1920 },
  76 };
  77
  78 /**
  79  * Map audio coding mode (acmod) to number of full-bandwidth channels.
  80  * from ATSC A/52 Table 5.8 Audio Coding Mode
  81  */
  82 const uint8_t ff_ac3_channels_tab[8] = {
  83     2, 1, 2, 3, 3, 4, 4, 5
  84 };
  85
  86 /**
  87  * Map audio coding mode (acmod) to channel layout mask.
  88  */
  89 const uint16_t avpriv_ac3_channel_layout_tab[8] = {
  90     AV_CH_LAYOUT_STEREO,
  91     AV_CH_LAYOUT_MONO,
  92     AV_CH_LAYOUT_STEREO,
  93     AV_CH_LAYOUT_SURROUND,
  94     AV_CH_LAYOUT_2_1,
  95     AV_CH_LAYOUT_4POINT0,
  96     AV_CH_LAYOUT_2_2,
  97     AV_CH_LAYOUT_5POINT0
  98 };
  99
 100 #define COMMON_CHANNEL_MAP \
 101     { { 0, 1,          }, { 0, 1, 2,         } },\
 102     { { 0,             }, { 0, 1,            } },\
 103     { { 0, 1,          }, { 0, 1, 2,         } },\
 104     { { 0, 2, 1,       }, { 0, 2, 1, 3,      } },\
 105     { { 0, 1, 2,       }, { 0, 1, 3, 2,      } },\
 106     { { 0, 2, 1, 3,    }, { 0, 2, 1, 4, 3,   } },
 107
 108 /**
 109  * Table to remap channels from SMPTE order to AC-3 order.
 110  * [channel_mode][lfe][ch]
 111  */
 112 const uint8_t ff_ac3_enc_channel_map[8][2][6] = {
 113     COMMON_CHANNEL_MAP
 114     { { 0, 1, 2, 3,    }, { 0, 1, 3, 4, 2,   } },
 115     { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 4, 5, 3 } },
 116 };
 117
 118 /**
 119  * Table to remap channels from AC-3 order to SMPTE order.
 120  * [channel_mode][lfe][ch]
 121  */
 122 const uint8_t ff_ac3_dec_channel_map[8][2][6] = {
 123     COMMON_CHANNEL_MAP
 124     { { 0, 1, 2, 3,    }, { 0, 1, 4, 2, 3,   } },
 125     { { 0, 2, 1, 3, 4, }, { 0, 2, 1, 5, 3, 4 } },
 126 };
 127
 128 /* possible frequencies */
 129 const uint16_t ff_ac3_sample_rate_tab[3] = { 48000, 44100, 32000 };
 130
 131 /* possible bitrates */
 132 const uint16_t ff_ac3_bitrate_tab[19] = {
 133     32, 40, 48, 56, 64, 80, 96, 112, 128,
 134     160, 192, 224, 256, 320, 384, 448, 512, 576, 640
 135 };
 136
 137 /**
 138  * Table of bin locations for rematrixing bands
 139  * reference: Section 7.5.2 Rematrixing : Frequency Band Definitions
 140  */
 141 const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 };
 142
 143 /**
 144  * Table E2.16 Default Coupling Banding Structure
 145  */
 146 const uint8_t ff_eac3_default_cpl_band_struct[18] = {
 147     0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1
 148 };
 149
 150 /* AC-3 MDCT window */
 151
 152 /* MDCT window */
 153 DECLARE_ALIGNED(16, const int16_t, ff_ac3_window)[AC3_WINDOW_SIZE/2] = {
 154     4,    7,   12,   16,   21,   28,   34,   42,
 155    51,   61,   72,   84,   97,  111,  127,  145,
 156   164,  184,  207,  231,  257,  285,  315,  347,
 157   382,  419,  458,  500,  544,  591,  641,  694,
 158   750,  810,  872,  937, 1007, 1079, 1155, 1235,
 159  1318, 1406, 1497, 1593, 1692, 1796, 1903, 2016,
 160  2132, 2253, 2379, 2509, 2644, 2783, 2927, 3076,
 161  3230, 3389, 3552, 3721, 3894, 4072, 4255, 4444,
 162  4637, 4835, 5038, 5246, 5459, 5677, 5899, 6127,
 163  6359, 6596, 6837, 7083, 7334, 7589, 7848, 8112,
 164  8380, 8652, 8927, 9207, 9491, 9778,10069,10363,
 165 10660,10960,11264,11570,11879,12190,12504,12820,
 166 13138,13458,13780,14103,14427,14753,15079,15407,
 167 15735,16063,16392,16720,17049,17377,17705,18032,
 168 18358,18683,19007,19330,19651,19970,20287,20602,
 169 20914,21225,21532,21837,22139,22438,22733,23025,
 170 23314,23599,23880,24157,24430,24699,24964,25225,
 171 25481,25732,25979,26221,26459,26691,26919,27142,
 172 27359,27572,27780,27983,28180,28373,28560,28742,
 173 28919,29091,29258,29420,29577,29729,29876,30018,
 174 30155,30288,30415,30538,30657,30771,30880,30985,
 175 31086,31182,31274,31363,31447,31528,31605,31678,
 176 31747,31814,31877,31936,31993,32046,32097,32145,
 177 32190,32232,32272,32310,32345,32378,32409,32438,
 178 32465,32490,32513,32535,32556,32574,32592,32608,
 179 32623,32636,32649,32661,32671,32681,32690,32698,
 180 32705,32712,32718,32724,32729,32733,32737,32741,
 181 32744,32747,32750,32752,32754,32756,32757,32759,
 182 32760,32761,32762,32763,32764,32764,32765,32765,
 183 32766,32766,32766,32766,32767,32767,32767,32767,
 184 32767,32767,32767,32767,32767,32767,32767,32767,
 185 32767,32767,32767,32767,32767,32767,32767,32767,
 186 };
 187
 188 const uint8_t ff_ac3_log_add_tab[260]= {
 189 0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,
 190 0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f,
 191 0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27,
 192 0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21,
 193 0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,
 194 0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16,
 195 0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12,
 196 0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f,
 197 0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c,
 198 0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a,
 199 0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08,
 200 0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06,
 201 0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05,
 202 0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04,
 203 0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03,
 204 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02,
 205 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
 206 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01,
 207 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
 208 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
 209 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
 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 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 214 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 215 };
 216
 217 const uint16_t ff_ac3_hearing_threshold_tab[AC3_CRITICAL_BANDS][3]= {
 218 { 0x04d0,0x04f0,0x0580 },
 219 { 0x04d0,0x04f0,0x0580 },
 220 { 0x0440,0x0460,0x04b0 },
 221 { 0x0400,0x0410,0x0450 },
 222 { 0x03e0,0x03e0,0x0420 },
 223 { 0x03c0,0x03d0,0x03f0 },
 224 { 0x03b0,0x03c0,0x03e0 },
 225 { 0x03b0,0x03b0,0x03d0 },
 226 { 0x03a0,0x03b0,0x03c0 },
 227 { 0x03a0,0x03a0,0x03b0 },
 228 { 0x03a0,0x03a0,0x03b0 },
 229 { 0x03a0,0x03a0,0x03b0 },
 230 { 0x03a0,0x03a0,0x03a0 },
 231 { 0x0390,0x03a0,0x03a0 },
 232 { 0x0390,0x0390,0x03a0 },
 233 { 0x0390,0x0390,0x03a0 },
 234 { 0x0380,0x0390,0x03a0 },
 235 { 0x0380,0x0380,0x03a0 },
 236 { 0x0370,0x0380,0x03a0 },
 237 { 0x0370,0x0380,0x03a0 },
 238 { 0x0360,0x0370,0x0390 },
 239 { 0x0360,0x0370,0x0390 },
 240 { 0x0350,0x0360,0x0390 },
 241 { 0x0350,0x0360,0x0390 },
 242 { 0x0340,0x0350,0x0380 },
 243 { 0x0340,0x0350,0x0380 },
 244 { 0x0330,0x0340,0x0380 },
 245 { 0x0320,0x0340,0x0370 },
 246 { 0x0310,0x0320,0x0360 },
 247 { 0x0300,0x0310,0x0350 },
 248 { 0x02f0,0x0300,0x0340 },
 249 { 0x02f0,0x02f0,0x0330 },
 250 { 0x02f0,0x02f0,0x0320 },
 251 { 0x02f0,0x02f0,0x0310 },
 252 { 0x0300,0x02f0,0x0300 },
 253 { 0x0310,0x0300,0x02f0 },
 254 { 0x0340,0x0320,0x02f0 },
 255 { 0x0390,0x0350,0x02f0 },
 256 { 0x03e0,0x0390,0x0300 },
 257 { 0x0420,0x03e0,0x0310 },
 258 { 0x0460,0x0420,0x0330 },
 259 { 0x0490,0x0450,0x0350 },
 260 { 0x04a0,0x04a0,0x03c0 },
 261 { 0x0460,0x0490,0x0410 },
 262 { 0x0440,0x0460,0x0470 },
 263 { 0x0440,0x0440,0x04a0 },
 264 { 0x0520,0x0480,0x0460 },
 265 { 0x0800,0x0630,0x0440 },
 266 { 0x0840,0x0840,0x0450 },
 267 { 0x0840,0x0840,0x04e0 },
 268 };
 269
 270 const uint8_t ff_ac3_bap_tab[64]= {
 271     0, 1, 1, 1, 1, 1, 2, 2, 3, 3,
 272     3, 4, 4, 5, 5, 6, 6, 6, 6, 7,
 273     7, 7, 7, 8, 8, 8, 8, 9, 9, 9,
 274     9, 10, 10, 10, 10, 11, 11, 11, 11, 12,
 275     12, 12, 12, 13, 13, 13, 13, 14, 14, 14,
 276     14, 14, 14, 14, 14, 15, 15, 15, 15, 15,
 277     15, 15, 15, 15,
 278 };
 279
 280 const uint8_t ff_ac3_slow_decay_tab[4]={
 281     0x0f, 0x11, 0x13, 0x15,
 282 };
 283
 284 const uint8_t ff_ac3_fast_decay_tab[4]={
 285     0x3f, 0x53, 0x67, 0x7b,
 286 };
 287
 288 const uint16_t ff_ac3_slow_gain_tab[4]= {
 289     0x540, 0x4d8, 0x478, 0x410,
 290 };
 291
 292 const uint16_t ff_ac3_db_per_bit_tab[4]= {
 293     0x000, 0x700, 0x900, 0xb00,
 294 };
 295
 296 const int16_t ff_ac3_floor_tab[8]= {
 297     0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
 298 };
 299
 300 const uint16_t ff_ac3_fast_gain_tab[8]= {
 301     0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
 302 };
 303
 304 /**
 305  * Default channel map for a dependent substream defined by acmod
 306  */
 307 const uint16_t ff_eac3_default_chmap[8] = {
 308     AC3_CHMAP_L |               AC3_CHMAP_R, // FIXME Ch1+Ch2
 309                   AC3_CHMAP_C,
 310     AC3_CHMAP_L |               AC3_CHMAP_R,
 311     AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R,
 312     AC3_CHMAP_L |               AC3_CHMAP_R |                   AC3_CHMAP_C_SUR,
 313     AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R |                   AC3_CHMAP_C_SUR,
 314     AC3_CHMAP_L |               AC3_CHMAP_R | AC3_CHMAP_L_SUR |                  AC3_CHMAP_R_SUR,
 315     AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_L_SUR |                  AC3_CHMAP_R_SUR
 316 };