falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
43714 Commits
32 Branches
824MB
Tree: 6c180b35c4
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '6c180b35c4'
${ noResults }
FFmpeg/libavcodec/ac3tab.c

315 lines
9.8KB
Raw Blame History 

  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/audioconvert.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. };