FFmpeg
dcaenc.h
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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 {
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 
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 */
int32_t m
Definition: dcaenc.h:30
static const uint8_t bitstream_sfreq[]
Definition: dcaenc.h:38
static const uint16_t erb[]
Definition: dcaenc.h:48
static int32_t quantize_value(int32_t value, softfloat quant)
Definition: dcaenc.h:149
static const int8_t channel_reorder_nolfe[16][9]
Definition: dcaenc.h:130
static const softfloat stepsize_inv[27]
Definition: dcaenc.h:53
uint8_t
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:108
static const softfloat scalefactor_inv[128]
Definition: dcaenc.h:63
static const int sample_rates[]
Definition: dcaenc.h:34
int32_t e
Definition: dcaenc.h:31
static const uint16_t fc[]
Definition: dcaenc.h:43
int32_t
static const int8_t channel_reorder_lfe[16][9]
Definition: dcaenc.h:111
static int32_t mul32(int32_t a, int32_t b)
Definition: dcamath.h:52
const uint8_t * quant
static const int8_t lfe_index[16]
Definition: dcaenc.h:107
static const int bit_consumption[27]
Definition: dcaenc.h:101