| 1 | /* |
| 2 | * DCA encoder tables |
| 3 | * Copyright (C) 2008-2012 Alexander E. Patrakov |
| 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 | #ifndef AVCODEC_DCAENC_H |
| 23 | #define AVCODEC_DCAENC_H |
| 24 | |
| 25 | #include <stdint.h> |
| 26 | |
| 27 | typedef struct { |
| 28 | int32_t m; |
| 29 | int32_t e; |
| 30 | } softfloat; |
| 31 | |
| 32 | static const int sample_rates[] = { |
| 33 | 8000, 16000, 32000, 11025, 22050, 44100, 12000, 24000, 48000, 0, |
| 34 | }; |
| 35 | |
| 36 | static const uint8_t bitstream_sfreq[] = { 1, 2, 3, 6, 7, 8, 11, 12, 13 }; |
| 37 | |
| 38 | /* Auditory filter center frequencies and bandwidths, in Hz. |
| 39 | * The last two are made up, because there is no scientific data. |
| 40 | */ |
| 41 | static const uint16_t fc[] = { |
| 42 | 50, 150, 250, 350, 450, 570, 700, 840, 1000, 1170, 1370, 1600, 1850, 2150, |
| 43 | 2500, 2900, 3400, 4000, 4800, 5800, 7000, 8500, 10500, 13500, 17000 |
| 44 | }; |
| 45 | |
| 46 | static const uint16_t erb[] = { |
| 47 | 80, 100, 100, 100, 110, 120, 140, 150, 160, 190, 210, 240, 280, |
| 48 | 320, 380, 450, 550, 700, 900, 1100, 1300, 1800, 2500, 3500, 4500 |
| 49 | }; |
| 50 | |
| 51 | static const softfloat stepsize_inv[27] = { |
| 52 | {0, 0}, {1342177360, 21}, {2147483647, 21}, {1342177360, 20}, |
| 53 | {1819901661, 20}, {2147483647, 20}, {1278263843, 19}, {1579032492, 19}, |
| 54 | {1412817763, 18}, {1220162327, 17}, {1118482133, 16}, {1917391412, 16}, |
| 55 | {1766017772, 15}, {1525212826, 14}, {1290553940, 13}, {2097179000, 13}, |
| 56 | {1677683200, 12}, {1497972244, 11}, {1310893147, 10}, {1165354136, 9}, |
| 57 | {1748031204, 9}, {1542092044, 8}, {1636178017, 7}, {1636178017, 6}, |
| 58 | {1636178017, 5}, {1636178017, 4}, {1636178017, 3}, |
| 59 | }; |
| 60 | |
| 61 | static const softfloat scalefactor_inv[128] = { |
| 62 | {2147483647, 1}, {2147483647, 1}, {2147483647, 2}, {2147483647, 2}, |
| 63 | {2147483647, 2}, {2147483647, 2}, {1431655765, 2}, {1431655765, 2}, |
| 64 | {1431655765, 2}, {2147483647, 3}, {2147483647, 3}, {1717986918, 3}, |
| 65 | {1431655765, 3}, {1227133513, 3}, {1227133513, 3}, {2147483647, 4}, |
| 66 | {1717986918, 4}, {1561806289, 4}, {1431655765, 4}, {1227133513, 4}, |
| 67 | {2147483647, 5}, {1908874353, 5}, {1717986918, 5}, {1493901668, 5}, |
| 68 | {1321528398, 5}, {1145324612, 5}, {2021161080, 6}, {1808407282, 6}, |
| 69 | {1561806289, 6}, {1374389534, 6}, {1227133513, 6}, {2147483647, 7}, |
| 70 | {1908874353, 7}, {1676084798, 7}, {1477838209, 7}, {1296593900, 7}, |
| 71 | {1145324612, 7}, {2021161080, 8}, {1773405851, 8}, {1561806289, 8}, |
| 72 | {1374389534, 8}, {1216273924, 8}, {2139127680, 9}, {1882725390, 9}, |
| 73 | {1660893697, 9}, {1462116526, 9}, {1287484341, 9}, {1135859119, 9}, |
| 74 | {1999112050, 10}, {1762037865, 10}, {1552982525, 10}, {1367551775, 10}, |
| 75 | {1205604855, 10}, {2124660150, 11}, {1871509153, 11}, {1648443220, 11}, |
| 76 | {1452459217, 11}, {1279990253, 11}, {1127704233, 11}, {1987368509, 12}, |
| 77 | {1750814693, 12}, {1542632939, 12}, {1359099663, 12}, {1197398995, 12}, |
| 78 | {2109880792, 13}, {1858853132, 13}, {1638006149, 13}, {1443165385, 13}, |
| 79 | {1271479187, 13}, {1120235993, 13}, {1973767086, 14}, {1739045674, 14}, |
| 80 | {1532153461, 14}, {1349922194, 14}, {1189384493, 14}, {2095804865, 15}, |
| 81 | {1846464029, 15}, {1626872524, 15}, {1433347133, 15}, {1262853884, 15}, |
| 82 | {1112619678, 15}, {1960569045, 16}, {1727349015, 16}, {1521881227, 16}, |
| 83 | {1340842289, 16}, {1181357555, 16}, {2081669156, 17}, {1834047752, 17}, |
| 84 | {1615889229, 17}, {1423675973, 17}, {1254322457, 17}, {1105123583, 17}, |
| 85 | {1947330755, 18}, {1715693602, 18}, {1511607799, 18}, {1331801790, 18}, |
| 86 | {1173384427, 18}, {2067616532, 19}, {1821667648, 19}, {1604980024, 19}, |
| 87 | {1414066955, 19}, {1245861410, 19}, {1097665748, 19}, {1934193616, 20}, |
| 88 | {1704119624, 20}, {1501412075, 20}, {1322817107, 20}, {1165466323, 20}, |
| 89 | {2053666205, 21}, {1809379407, 21}, {1594151671, 21}, {1404526328, 21}, |
| 90 | {1237455941, 21}, {1090259329, 21}, {1921143210, 22}, {1692621231, 22}, |
| 91 | {1491281857, 22}, {1313892269, 22}, {1157603482, 22}, {2039810470, 23}, |
| 92 | {1797172644, 23}, {1583396912, 23}, {1395050052, 23}, {1229107276, 23}, |
| 93 | {1082903494, 23}, {1082903494, 23}, {1082903494, 23}, {1082903494, 23}, |
| 94 | }; |
| 95 | |
| 96 | /* manually derived from |
| 97 | * Table B.5: Selection of quantization levels and codebooks |
| 98 | * FIXME: will become invalid when Huffman codes are introduced. |
| 99 | */ |
| 100 | static const int bit_consumption[27] = { |
| 101 | -8, 28, 40, 48, 52, 60, 68, 76, 80, 96, |
| 102 | 112, 128, 144, 160, 176, 192, 208, 224, 240, 256, |
| 103 | 272, 288, 304, 320, 336, 352, 368, |
| 104 | }; |
| 105 | |
| 106 | /* Table B.5: Selection of quantization levels and codebooks */ |
| 107 | static const int quant_levels[27] = { |
| 108 | 1, 3, 5, 7, 9, 13, 17, 25, 32, 64, |
| 109 | 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, |
| 110 | 131072, 262144, 524288, 1048576, 2097152, 4194304, 8388608, |
| 111 | }; |
| 112 | |
| 113 | #endif /* AVCODEC_DCAENC_H */ |