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Diffstat (limited to 'libavcodec/dcaenc.h')
| -rw-r--r-- | libavcodec/dcaenc.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/libavcodec/dcaenc.h b/libavcodec/dcaenc.h new file mode 100644 index 0000000000..20f557bd21 --- /dev/null +++ b/libavcodec/dcaenc.h @@ -0,0 +1,113 @@ +/* + * DCA encoder tables + * Copyright (C) 2008-2012 Alexander E. Patrakov + * + * 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 + */ + +#ifndef AVCODEC_DCAENC_H +#define AVCODEC_DCAENC_H + +#include <stdint.h> + +typedef struct { + int32_t m; + int32_t e; +} softfloat; + +static const int sample_rates[] = { + 8000, 16000, 32000, 11025, 22050, 44100, 12000, 24000, 48000, 0, +}; + +static const uint8_t bitstream_sfreq[] = { 1, 2, 3, 6, 7, 8, 11, 12, 13 }; + +/* Auditory filter center frequencies and bandwidths, in Hz. + * The last two are made up, because there is no scientific data. + */ +static uint16_t fc[] = { + 50, 150, 250, 350, 450, 570, 700, 840, 1000, 1170, 1370, 1600, 1850, 2150, + 2500, 2900, 3400, 4000, 4800, 5800, 7000, 8500, 10500, 13500, 17000 +}; + +static uint16_t erb[] = { + 80, 100, 100, 100, 110, 120, 140, 150, 160, 190, 210, 240, 280, + 320, 380, 450, 550, 700, 900, 1100, 1300, 1800, 2500, 3500, 4500 +}; + +static const softfloat stepsize_inv[27] = { + {0, 0}, {1342177360, 21}, {2147483647, 21}, {1342177360, 20}, + {1819901661, 20}, {2147483647, 20}, {1278263843, 19}, {1579032492, 19}, + {1412817763, 18}, {1220162327, 17}, {1118482133, 16}, {1917391412, 16}, + {1766017772, 15}, {1525212826, 14}, {1290553940, 13}, {2097179000, 13}, + {1677683200, 12}, {1497972244, 11}, {1310893147, 10}, {1165354136, 9}, + {1748031204, 9}, {1542092044, 8}, {1636178017, 7}, {1636178017, 6}, + {1636178017, 5}, {1636178017, 4}, {1636178017, 3}, +}; + +static const softfloat scalefactor_inv[128] = { + {2147483647, 1}, {2147483647, 1}, {2147483647, 2}, {2147483647, 2}, + {2147483647, 2}, {2147483647, 2}, {1431655765, 2}, {1431655765, 2}, + {1431655765, 2}, {2147483647, 3}, {2147483647, 3}, {1717986918, 3}, + {1431655765, 3}, {1227133513, 3}, {1227133513, 3}, {2147483647, 4}, + {1717986918, 4}, {1561806289, 4}, {1431655765, 4}, {1227133513, 4}, + {2147483647, 5}, {1908874353, 5}, {1717986918, 5}, {1493901668, 5}, + {1321528398, 5}, {1145324612, 5}, {2021161080, 6}, {1808407282, 6}, + {1561806289, 6}, {1374389534, 6}, {1227133513, 6}, {2147483647, 7}, + {1908874353, 7}, {1676084798, 7}, {1477838209, 7}, {1296593900, 7}, + {1145324612, 7}, {2021161080, 8}, {1773405851, 8}, {1561806289, 8}, + {1374389534, 8}, {1216273924, 8}, {2139127680, 9}, {1882725390, 9}, + {1660893697, 9}, {1462116526, 9}, {1287484341, 9}, {1135859119, 9}, + {1999112050, 10}, {1762037865, 10}, {1552982525, 10}, {1367551775, 10}, + {1205604855, 10}, {2124660150, 11}, {1871509153, 11}, {1648443220, 11}, + {1452459217, 11}, {1279990253, 11}, {1127704233, 11}, {1987368509, 12}, + {1750814693, 12}, {1542632939, 12}, {1359099663, 12}, {1197398995, 12}, + {2109880792, 13}, {1858853132, 13}, {1638006149, 13}, {1443165385, 13}, + {1271479187, 13}, {1120235993, 13}, {1973767086, 14}, {1739045674, 14}, + {1532153461, 14}, {1349922194, 14}, {1189384493, 14}, {2095804865, 15}, + {1846464029, 15}, {1626872524, 15}, {1433347133, 15}, {1262853884, 15}, + {1112619678, 15}, {1960569045, 16}, {1727349015, 16}, {1521881227, 16}, + {1340842289, 16}, {1181357555, 16}, {2081669156, 17}, {1834047752, 17}, + {1615889229, 17}, {1423675973, 17}, {1254322457, 17}, {1105123583, 17}, + {1947330755, 18}, {1715693602, 18}, {1511607799, 18}, {1331801790, 18}, + {1173384427, 18}, {2067616532, 19}, {1821667648, 19}, {1604980024, 19}, + {1414066955, 19}, {1245861410, 19}, {1097665748, 19}, {1934193616, 20}, + {1704119624, 20}, {1501412075, 20}, {1322817107, 20}, {1165466323, 20}, + {2053666205, 21}, {1809379407, 21}, {1594151671, 21}, {1404526328, 21}, + {1237455941, 21}, {1090259329, 21}, {1921143210, 22}, {1692621231, 22}, + {1491281857, 22}, {1313892269, 22}, {1157603482, 22}, {2039810470, 23}, + {1797172644, 23}, {1583396912, 23}, {1395050052, 23}, {1229107276, 23}, + {1082903494, 23}, {1082903494, 23}, {1082903494, 23}, {1082903494, 23}, +}; + +/* manually derived from + * Table B.5: Selection of quantization levels and codebooks + * FIXME: will become invalid when Huffman codes are introduced. + */ +static const int bit_consumption[27] = { + -8, 28, 40, 48, 52, 60, 68, 76, 80, 96, + 112, 128, 144, 160, 176, 192, 208, 224, 240, 256, + 272, 288, 304, 320, 336, 352, 368, +}; + +/* Table B.5: Selection of quantization levels and codebooks */ +static const int quant_levels[27] = { + 1, 3, 5, 7, 9, 13, 17, 25, 32, 64, + 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, + 131072, 262144, 524288, 1048576, 2097152, 4194304, 8388608, +}; + +#endif /* AVCODEC_DCAENC_H */ |