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FFmpeg/libavcodec/ac3tab.c

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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 "libavutil/mem_internal.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 int ff_ac3_sample_rate_tab[] = { 48000, 44100, 32000, 0 };

  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. const uint8_t ff_ac3_log_add_tab[260]= {

  151. 0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,

  152. 0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f,

  153. 0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27,

  154. 0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21,

  155. 0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,

  156. 0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16,

  157. 0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12,

  158. 0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f,

  159. 0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c,

  160. 0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a,

  161. 0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08,

  162. 0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06,

  163. 0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05,

  164. 0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04,

  165. 0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03,

  166. 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02,

  167. 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,

  168. 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01,

  169. 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,

  170. 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,

  171. 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,

  172. 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,

  173. 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,

  174. 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,

  175. 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,

  176. 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,

  177. };

  178. 

  179. const uint16_t ff_ac3_hearing_threshold_tab[AC3_CRITICAL_BANDS][3]= {

  180. { 0x04d0,0x04f0,0x0580 },

  181. { 0x04d0,0x04f0,0x0580 },

  182. { 0x0440,0x0460,0x04b0 },

  183. { 0x0400,0x0410,0x0450 },

  184. { 0x03e0,0x03e0,0x0420 },

  185. { 0x03c0,0x03d0,0x03f0 },

  186. { 0x03b0,0x03c0,0x03e0 },

  187. { 0x03b0,0x03b0,0x03d0 },

  188. { 0x03a0,0x03b0,0x03c0 },

  189. { 0x03a0,0x03a0,0x03b0 },

  190. { 0x03a0,0x03a0,0x03b0 },

  191. { 0x03a0,0x03a0,0x03b0 },

  192. { 0x03a0,0x03a0,0x03a0 },

  193. { 0x0390,0x03a0,0x03a0 },

  194. { 0x0390,0x0390,0x03a0 },

  195. { 0x0390,0x0390,0x03a0 },

  196. { 0x0380,0x0390,0x03a0 },

  197. { 0x0380,0x0380,0x03a0 },

  198. { 0x0370,0x0380,0x03a0 },

  199. { 0x0370,0x0380,0x03a0 },

  200. { 0x0360,0x0370,0x0390 },

  201. { 0x0360,0x0370,0x0390 },

  202. { 0x0350,0x0360,0x0390 },

  203. { 0x0350,0x0360,0x0390 },

  204. { 0x0340,0x0350,0x0380 },

  205. { 0x0340,0x0350,0x0380 },

  206. { 0x0330,0x0340,0x0380 },

  207. { 0x0320,0x0340,0x0370 },

  208. { 0x0310,0x0320,0x0360 },

  209. { 0x0300,0x0310,0x0350 },

  210. { 0x02f0,0x0300,0x0340 },

  211. { 0x02f0,0x02f0,0x0330 },

  212. { 0x02f0,0x02f0,0x0320 },

  213. { 0x02f0,0x02f0,0x0310 },

  214. { 0x0300,0x02f0,0x0300 },

  215. { 0x0310,0x0300,0x02f0 },

  216. { 0x0340,0x0320,0x02f0 },

  217. { 0x0390,0x0350,0x02f0 },

  218. { 0x03e0,0x0390,0x0300 },

  219. { 0x0420,0x03e0,0x0310 },

  220. { 0x0460,0x0420,0x0330 },

  221. { 0x0490,0x0450,0x0350 },

  222. { 0x04a0,0x04a0,0x03c0 },

  223. { 0x0460,0x0490,0x0410 },

  224. { 0x0440,0x0460,0x0470 },

  225. { 0x0440,0x0440,0x04a0 },

  226. { 0x0520,0x0480,0x0460 },

  227. { 0x0800,0x0630,0x0440 },

  228. { 0x0840,0x0840,0x0450 },

  229. { 0x0840,0x0840,0x04e0 },

  230. };

  231. 

  232. const uint8_t ff_ac3_bap_tab[64]= {

  233.     0, 1, 1, 1, 1, 1, 2, 2, 3, 3,

  234.     3, 4, 4, 5, 5, 6, 6, 6, 6, 7,

  235.     7, 7, 7, 8, 8, 8, 8, 9, 9, 9,

  236.     9, 10, 10, 10, 10, 11, 11, 11, 11, 12,

  237.     12, 12, 12, 13, 13, 13, 13, 14, 14, 14,

  238.     14, 14, 14, 14, 14, 15, 15, 15, 15, 15,

  239.     15, 15, 15, 15,

  240. };

  241. 

  242. const uint8_t ff_ac3_slow_decay_tab[4]={

  243.     0x0f, 0x11, 0x13, 0x15,

  244. };

  245. 

  246. const uint8_t ff_ac3_fast_decay_tab[4]={

  247.     0x3f, 0x53, 0x67, 0x7b,

  248. };

  249. 

  250. const uint16_t ff_ac3_slow_gain_tab[4]= {

  251.     0x540, 0x4d8, 0x478, 0x410,

  252. };

  253. 

  254. const uint16_t ff_ac3_db_per_bit_tab[4]= {

  255.     0x000, 0x700, 0x900, 0xb00,

  256. };

  257. 

  258. const int16_t ff_ac3_floor_tab[8]= {

  259.     0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,

  260. };

  261. 

  262. const uint16_t ff_ac3_fast_gain_tab[8]= {

  263.     0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,

  264. };

  265. 

  266. /**

  267.  * Default channel map for a dependent substream defined by acmod

  268.  */

  269. const uint16_t ff_eac3_default_chmap[8] = {

  270.     AC3_CHMAP_L |               AC3_CHMAP_R, // FIXME Ch1+Ch2

  271.                   AC3_CHMAP_C,

  272.     AC3_CHMAP_L |               AC3_CHMAP_R,

  273.     AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R,

  274.     AC3_CHMAP_L |               AC3_CHMAP_R |                   AC3_CHMAP_C_SUR,

  275.     AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R |                   AC3_CHMAP_C_SUR,

  276.     AC3_CHMAP_L |               AC3_CHMAP_R | AC3_CHMAP_L_SUR |                  AC3_CHMAP_R_SUR,

  277.     AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_L_SUR |                  AC3_CHMAP_R_SUR

  278. };

  279. const uint64_t ff_eac3_custom_channel_map_locations[16][2] = {

  280.     { 1, AV_CH_FRONT_LEFT },

  281.     { 1, AV_CH_FRONT_CENTER },

  282.     { 1, AV_CH_FRONT_RIGHT },

  283.     { 1, AV_CH_SIDE_LEFT },

  284.     { 1, AV_CH_SIDE_RIGHT },

  285.     { 0, AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER },

  286.     { 0, AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT },

  287.     { 0, AV_CH_BACK_CENTER },

  288.     { 0, AV_CH_TOP_CENTER },

  289.     { 0, AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT },

  290.     { 0, AV_CH_WIDE_LEFT | AV_CH_WIDE_RIGHT },

  291.     { 0, AV_CH_TOP_FRONT_LEFT | AV_CH_TOP_FRONT_RIGHT},

  292.     { 0, AV_CH_TOP_FRONT_CENTER },

  293.     { 0, AV_CH_TOP_BACK_LEFT | AV_CH_TOP_BACK_RIGHT },

  294.     { 0, AV_CH_LOW_FREQUENCY_2 },

  295.     { 1, AV_CH_LOW_FREQUENCY },

  296. };