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 #include "dcamath.h"
28
29 typedef struct {
30 int32_t m;
31 int32_t e;
32 } softfloat;
33
34 static const int sample_rates[] = {
35 8000, 16000, 32000, 11025, 22050, 44100, 12000, 24000, 48000, 0,
36 };
37
38 static const uint8_t bitstream_sfreq[] = { 1, 2, 3, 6, 7, 8, 11, 12, 13 };
39
40 /* Auditory filter center frequencies and bandwidths, in Hz.
41 * The last two are made up, because there is no scientific data.
42 */
43 static const uint16_t fc[] = {
44 50, 150, 250, 350, 450, 570, 700, 840, 1000, 1170, 1370, 1600, 1850, 2150,
45 2500, 2900, 3400, 4000, 4800, 5800, 7000, 8500, 10500, 13500, 17000
46 };
47
48 static const uint16_t erb[] = {
49 80, 100, 100, 100, 110, 120, 140, 150, 160, 190, 210, 240, 280,
50 320, 380, 450, 550, 700, 900, 1100, 1300, 1800, 2500, 3500, 4500
51 };
52
53 static const softfloat stepsize_inv[27] = {
54 {0, 0}, {1342177360, 21}, {2147483647, 21}, {1342177360, 20},
55 {1819901661, 20}, {2147483647, 20}, {1278263843, 19}, {1579032492, 19},
56 {1412817763, 18}, {1220162327, 17}, {1118482133, 16}, {1917391412, 16},
57 {1766017772, 15}, {1525212826, 14}, {1290553940, 13}, {2097179000, 13},
58 {1677683200, 12}, {1497972244, 11}, {1310893147, 10}, {1165354136, 9},
59 {1748031204, 9}, {1542092044, 8}, {1636178017, 7}, {1636178017, 6},
60 {1636178017, 5}, {1636178017, 4}, {1636178017, 3},
61 };
62
63 static const softfloat scalefactor_inv[128] = {
64 {2147483647, 1}, {2147483647, 1}, {2147483647, 2}, {2147483647, 2},
65 {2147483647, 2}, {2147483647, 2}, {1431655765, 2}, {1431655765, 2},
66 {1431655765, 2}, {2147483647, 3}, {2147483647, 3}, {1717986918, 3},
67 {1431655765, 3}, {1227133513, 3}, {1227133513, 3}, {2147483647, 4},
68 {1717986918, 4}, {1561806289, 4}, {1431655765, 4}, {1227133513, 4},
69 {2147483647, 5}, {1908874353, 5}, {1717986918, 5}, {1493901668, 5},
70 {1321528398, 5}, {1145324612, 5}, {2021161080, 6}, {1808407282, 6},
71 {1561806289, 6}, {1374389534, 6}, {1227133513, 6}, {2147483647, 7},
72 {1908874353, 7}, {1676084798, 7}, {1477838209, 7}, {1296593900, 7},
73 {1145324612, 7}, {2021161080, 8}, {1773405851, 8}, {1561806289, 8},
74 {1374389534, 8}, {1216273924, 8}, {2139127680, 9}, {1882725390, 9},
75 {1660893697, 9}, {1462116526, 9}, {1287484341, 9}, {1135859119, 9},
76 {1999112050, 10}, {1762037865, 10}, {1552982525, 10}, {1367551775, 10},
77 {1205604855, 10}, {2124660150, 11}, {1871509153, 11}, {1648443220, 11},
78 {1452459217, 11}, {1279990253, 11}, {1127704233, 11}, {1987368509, 12},
79 {1750814693, 12}, {1542632939, 12}, {1359099663, 12}, {1197398995, 12},
80 {2109880792, 13}, {1858853132, 13}, {1638006149, 13}, {1443165385, 13},
81 {1271479187, 13}, {1120235993, 13}, {1973767086, 14}, {1739045674, 14},
82 {1532153461, 14}, {1349922194, 14}, {1189384493, 14}, {2095804865, 15},
83 {1846464029, 15}, {1626872524, 15}, {1433347133, 15}, {1262853884, 15},
84 {1112619678, 15}, {1960569045, 16}, {1727349015, 16}, {1521881227, 16},
85 {1340842289, 16}, {1181357555, 16}, {2081669156, 17}, {1834047752, 17},
86 {1615889229, 17}, {1423675973, 17}, {1254322457, 17}, {1105123583, 17},
87 {1947330755, 18}, {1715693602, 18}, {1511607799, 18}, {1331801790, 18},
88 {1173384427, 18}, {2067616532, 19}, {1821667648, 19}, {1604980024, 19},
89 {1414066955, 19}, {1245861410, 19}, {1097665748, 19}, {1934193616, 20},
90 {1704119624, 20}, {1501412075, 20}, {1322817107, 20}, {1165466323, 20},
91 {2053666205, 21}, {1809379407, 21}, {1594151671, 21}, {1404526328, 21},
92 {1237455941, 21}, {1090259329, 21}, {1921143210, 22}, {1692621231, 22},
93 {1491281857, 22}, {1313892269, 22}, {1157603482, 22}, {2039810470, 23},
94 {1797172644, 23}, {1583396912, 23}, {1395050052, 23}, {1229107276, 23},
95 {1082903494, 23}, {1082903494, 23}, {1082903494, 23}, {1082903494, 23},
96 };
97
98 /* manually derived from
99 * Table B.5: Selection of quantization levels and codebooks
100 */
101 static const int bit_consumption[27] = {
102 -8, 28, 40, 48, 52, 60, 68, 76, 80, 96,
103 112, 128, 144, 160, 176, 192, 208, 224, 240, 256,
104 272, 288, 304, 320, 336, 352, 368,
105 };
106
107 static const int8_t lfe_index[16] = {
108 1, 2, 2, 2, 2, 3, 2, 3, 2, 3, 2, 3, 1, 3, 2, 3
109 };
110
111 static const int8_t channel_reorder_lfe[16][9] = {
112 { 0, -1, -1, -1, -1, -1, -1, -1, -1 },
113 { 0, 1, -1, -1, -1, -1, -1, -1, -1 },
114 { 0, 1, -1, -1, -1, -1, -1, -1, -1 },
115 { 0, 1, -1, -1, -1, -1, -1, -1, -1 },
116 { 0, 1, -1, -1, -1, -1, -1, -1, -1 },
117 { 2, 0, 1, -1, -1, -1, -1, -1, -1 },
118 { 0, 1, 3, -1, -1, -1, -1, -1, -1 },
119 { 2, 0, 1, 4, -1, -1, -1, -1, -1 },
120 { 0, 1, 3, 4, -1, -1, -1, -1, -1 },
121 { 2, 0, 1, 4, 5, -1, -1, -1, -1 },
122 { 3, 4, 0, 1, 5, 6, -1, -1, -1 },
123 { 2, 0, 1, 4, 5, 6, -1, -1, -1 },
124 { 0, 6, 4, 5, 2, 3, -1, -1, -1 },
125 { 4, 2, 5, 0, 1, 6, 7, -1, -1 },
126 { 5, 6, 0, 1, 7, 3, 8, 4, -1 },
127 { 4, 2, 5, 0, 1, 6, 8, 7, -1 },
128 };
129
130 static const int8_t channel_reorder_nolfe[16][9] = {
131 { 0, -1, -1, -1, -1, -1, -1, -1, -1 },
132 { 0, 1, -1, -1, -1, -1, -1, -1, -1 },
133 { 0, 1, -1, -1, -1, -1, -1, -1, -1 },
134 { 0, 1, -1, -1, -1, -1, -1, -1, -1 },
135 { 0, 1, -1, -1, -1, -1, -1, -1, -1 },
136 { 2, 0, 1, -1, -1, -1, -1, -1, -1 },
137 { 0, 1, 2, -1, -1, -1, -1, -1, -1 },
138 { 2, 0, 1, 3, -1, -1, -1, -1, -1 },
139 { 0, 1, 2, 3, -1, -1, -1, -1, -1 },
140 { 2, 0, 1, 3, 4, -1, -1, -1, -1 },
141 { 2, 3, 0, 1, 4, 5, -1, -1, -1 },
142 { 2, 0, 1, 3, 4, 5, -1, -1, -1 },
143 { 0, 5, 3, 4, 1, 2, -1, -1, -1 },
144 { 3, 2, 4, 0, 1, 5, 6, -1, -1 },
145 { 4, 5, 0, 1, 6, 2, 7, 3, -1 },
146 { 3, 2, 4, 0, 1, 5, 7, 6, -1 },
147 };
148
quantize_value(int32_t value,softfloat quant)149 static inline int32_t quantize_value(int32_t value, softfloat quant)
150 {
151 int32_t offset = 1 << (quant.e - 1);
152
153 value = mul32(value, quant.m) + offset;
154 value = value >> quant.e;
155 return value;
156 }
157
158 #endif /* AVCODEC_DCAENC_H */
159