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  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 "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 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. };
  315.