| /* |
| * AC-3 tables |
| * copyright (c) 2001 Fabrice Bellard |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file libavcodec/ac3tab.c |
| * tables taken directly from the AC-3 spec. |
| */ |
| |
| #include "ac3tab.h" |
| |
| /** |
| * Possible frame sizes. |
| * from ATSC A/52 Table 5.18 Frame Size Code Table. |
| */ |
| const uint16_t ff_ac3_frame_size_tab[38][3] = { |
| { 64, 69, 96 }, |
| { 64, 70, 96 }, |
| { 80, 87, 120 }, |
| { 80, 88, 120 }, |
| { 96, 104, 144 }, |
| { 96, 105, 144 }, |
| { 112, 121, 168 }, |
| { 112, 122, 168 }, |
| { 128, 139, 192 }, |
| { 128, 140, 192 }, |
| { 160, 174, 240 }, |
| { 160, 175, 240 }, |
| { 192, 208, 288 }, |
| { 192, 209, 288 }, |
| { 224, 243, 336 }, |
| { 224, 244, 336 }, |
| { 256, 278, 384 }, |
| { 256, 279, 384 }, |
| { 320, 348, 480 }, |
| { 320, 349, 480 }, |
| { 384, 417, 576 }, |
| { 384, 418, 576 }, |
| { 448, 487, 672 }, |
| { 448, 488, 672 }, |
| { 512, 557, 768 }, |
| { 512, 558, 768 }, |
| { 640, 696, 960 }, |
| { 640, 697, 960 }, |
| { 768, 835, 1152 }, |
| { 768, 836, 1152 }, |
| { 896, 975, 1344 }, |
| { 896, 976, 1344 }, |
| { 1024, 1114, 1536 }, |
| { 1024, 1115, 1536 }, |
| { 1152, 1253, 1728 }, |
| { 1152, 1254, 1728 }, |
| { 1280, 1393, 1920 }, |
| { 1280, 1394, 1920 }, |
| }; |
| |
| /** |
| * Maps audio coding mode (acmod) to number of full-bandwidth channels. |
| * from ATSC A/52 Table 5.8 Audio Coding Mode |
| */ |
| const uint8_t ff_ac3_channels_tab[8] = { |
| 2, 1, 2, 3, 3, 4, 4, 5 |
| }; |
| |
| /* possible frequencies */ |
| const uint16_t ff_ac3_sample_rate_tab[3] = { 48000, 44100, 32000 }; |
| |
| /* possible bitrates */ |
| const uint16_t ff_ac3_bitrate_tab[19] = { |
| 32, 40, 48, 56, 64, 80, 96, 112, 128, |
| 160, 192, 224, 256, 320, 384, 448, 512, 576, 640 |
| }; |
| |
| /* AC-3 MDCT window */ |
| |
| /* MDCT window */ |
| const int16_t ff_ac3_window[256] = { |
| 4, 7, 12, 16, 21, 28, 34, 42, |
| 51, 61, 72, 84, 97, 111, 127, 145, |
| 164, 184, 207, 231, 257, 285, 315, 347, |
| 382, 419, 458, 500, 544, 591, 641, 694, |
| 750, 810, 872, 937, 1007, 1079, 1155, 1235, |
| 1318, 1406, 1497, 1593, 1692, 1796, 1903, 2016, |
| 2132, 2253, 2379, 2509, 2644, 2783, 2927, 3076, |
| 3230, 3389, 3552, 3721, 3894, 4072, 4255, 4444, |
| 4637, 4835, 5038, 5246, 5459, 5677, 5899, 6127, |
| 6359, 6596, 6837, 7083, 7334, 7589, 7848, 8112, |
| 8380, 8652, 8927, 9207, 9491, 9778,10069,10363, |
| 10660,10960,11264,11570,11879,12190,12504,12820, |
| 13138,13458,13780,14103,14427,14753,15079,15407, |
| 15735,16063,16392,16720,17049,17377,17705,18032, |
| 18358,18683,19007,19330,19651,19970,20287,20602, |
| 20914,21225,21532,21837,22139,22438,22733,23025, |
| 23314,23599,23880,24157,24430,24699,24964,25225, |
| 25481,25732,25979,26221,26459,26691,26919,27142, |
| 27359,27572,27780,27983,28180,28373,28560,28742, |
| 28919,29091,29258,29420,29577,29729,29876,30018, |
| 30155,30288,30415,30538,30657,30771,30880,30985, |
| 31086,31182,31274,31363,31447,31528,31605,31678, |
| 31747,31814,31877,31936,31993,32046,32097,32145, |
| 32190,32232,32272,32310,32345,32378,32409,32438, |
| 32465,32490,32513,32535,32556,32574,32592,32608, |
| 32623,32636,32649,32661,32671,32681,32690,32698, |
| 32705,32712,32718,32724,32729,32733,32737,32741, |
| 32744,32747,32750,32752,32754,32756,32757,32759, |
| 32760,32761,32762,32763,32764,32764,32765,32765, |
| 32766,32766,32766,32766,32767,32767,32767,32767, |
| 32767,32767,32767,32767,32767,32767,32767,32767, |
| 32767,32767,32767,32767,32767,32767,32767,32767, |
| }; |
| |
| const uint8_t ff_ac3_log_add_tab[260]= { |
| 0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37, |
| 0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f, |
| 0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27, |
| 0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21, |
| 0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b, |
| 0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16, |
| 0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12, |
| 0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f, |
| 0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c, |
| 0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a, |
| 0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08, |
| 0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06, |
| 0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05, |
| 0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04, |
| 0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03, |
| 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02, |
| 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02, |
| 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01, |
| 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, |
| 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, |
| 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, |
| 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, |
| 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, |
| 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, |
| 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, |
| 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, |
| }; |
| |
| const uint16_t ff_ac3_hearing_threshold_tab[50][3]= { |
| { 0x04d0,0x04f0,0x0580 }, |
| { 0x04d0,0x04f0,0x0580 }, |
| { 0x0440,0x0460,0x04b0 }, |
| { 0x0400,0x0410,0x0450 }, |
| { 0x03e0,0x03e0,0x0420 }, |
| { 0x03c0,0x03d0,0x03f0 }, |
| { 0x03b0,0x03c0,0x03e0 }, |
| { 0x03b0,0x03b0,0x03d0 }, |
| { 0x03a0,0x03b0,0x03c0 }, |
| { 0x03a0,0x03a0,0x03b0 }, |
| { 0x03a0,0x03a0,0x03b0 }, |
| { 0x03a0,0x03a0,0x03b0 }, |
| { 0x03a0,0x03a0,0x03a0 }, |
| { 0x0390,0x03a0,0x03a0 }, |
| { 0x0390,0x0390,0x03a0 }, |
| { 0x0390,0x0390,0x03a0 }, |
| { 0x0380,0x0390,0x03a0 }, |
| { 0x0380,0x0380,0x03a0 }, |
| { 0x0370,0x0380,0x03a0 }, |
| { 0x0370,0x0380,0x03a0 }, |
| { 0x0360,0x0370,0x0390 }, |
| { 0x0360,0x0370,0x0390 }, |
| { 0x0350,0x0360,0x0390 }, |
| { 0x0350,0x0360,0x0390 }, |
| { 0x0340,0x0350,0x0380 }, |
| { 0x0340,0x0350,0x0380 }, |
| { 0x0330,0x0340,0x0380 }, |
| { 0x0320,0x0340,0x0370 }, |
| { 0x0310,0x0320,0x0360 }, |
| { 0x0300,0x0310,0x0350 }, |
| { 0x02f0,0x0300,0x0340 }, |
| { 0x02f0,0x02f0,0x0330 }, |
| { 0x02f0,0x02f0,0x0320 }, |
| { 0x02f0,0x02f0,0x0310 }, |
| { 0x0300,0x02f0,0x0300 }, |
| { 0x0310,0x0300,0x02f0 }, |
| { 0x0340,0x0320,0x02f0 }, |
| { 0x0390,0x0350,0x02f0 }, |
| { 0x03e0,0x0390,0x0300 }, |
| { 0x0420,0x03e0,0x0310 }, |
| { 0x0460,0x0420,0x0330 }, |
| { 0x0490,0x0450,0x0350 }, |
| { 0x04a0,0x04a0,0x03c0 }, |
| { 0x0460,0x0490,0x0410 }, |
| { 0x0440,0x0460,0x0470 }, |
| { 0x0440,0x0440,0x04a0 }, |
| { 0x0520,0x0480,0x0460 }, |
| { 0x0800,0x0630,0x0440 }, |
| { 0x0840,0x0840,0x0450 }, |
| { 0x0840,0x0840,0x04e0 }, |
| }; |
| |
| const uint8_t ff_ac3_bap_tab[64]= { |
| 0, 1, 1, 1, 1, 1, 2, 2, 3, 3, |
| 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, |
| 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, |
| 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, |
| 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, |
| 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, |
| 15, 15, 15, 15, |
| }; |
| |
| const uint8_t ff_ac3_slow_decay_tab[4]={ |
| 0x0f, 0x11, 0x13, 0x15, |
| }; |
| |
| const uint8_t ff_ac3_fast_decay_tab[4]={ |
| 0x3f, 0x53, 0x67, 0x7b, |
| }; |
| |
| const uint16_t ff_ac3_slow_gain_tab[4]= { |
| 0x540, 0x4d8, 0x478, 0x410, |
| }; |
| |
| const uint16_t ff_ac3_db_per_bit_tab[4]= { |
| 0x000, 0x700, 0x900, 0xb00, |
| }; |
| |
| const int16_t ff_ac3_floor_tab[8]= { |
| 0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800, |
| }; |
| |
| const uint16_t ff_ac3_fast_gain_tab[8]= { |
| 0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400, |
| }; |
| |
| const uint8_t ff_ac3_critical_band_size_tab[50]={ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, |
| 3, 6, 6, 6, 6, 6, 6, 12, 12, 12, 12, 24, 24, 24, 24, 24 |
| }; |
| /** |
| * Default channel map for a dependent substream defined by acmod |
| */ |
| const uint16_t ff_eac3_default_chmap[8] = { |
| AC3_CHMAP_L | AC3_CHMAP_R, // FIXME Ch1+Ch2 |
| AC3_CHMAP_C, |
| AC3_CHMAP_L | AC3_CHMAP_R, |
| AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R, |
| AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_C_SUR, |
| AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_C_SUR, |
| AC3_CHMAP_L | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR, |
| AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_L_SUR | AC3_CHMAP_R_SUR |
| }; |
