FFmpeg
rv34data.h
Go to the documentation of this file.
1 /*
2  * RealVideo 4 decoder
3  * copyright (c) 2007 Konstantin Shishkov
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 /**
23  * @file
24  * miscellaneous RV30/40 tables
25  */
26 
27 #ifndef AVCODEC_RV34DATA_H
28 #define AVCODEC_RV34DATA_H
29 
30 #include <stdint.h>
31 
32 /**
33  * number of ones in nibble minus one
34  */
35 static const uint8_t rv34_count_ones[16] = {
36  0, 0, 0, 1, 0, 1, 1, 2, 0, 1, 1, 2, 1, 2, 2, 3
37 };
38 
39 /**
40  * values used to reconstruct coded block pattern
41  */
42 static const uint8_t rv34_cbp_code[16] = {
43  0x00, 0x20, 0x10, 0x30, 0x02, 0x22, 0x12, 0x32,
44  0x01, 0x21, 0x11, 0x31, 0x03, 0x23, 0x13, 0x33
45 };
46 
47 /**
48  * precalculated results of division by three and modulo three for values 0-107
49  *
50  * A lot of four-tuples in RV40 are represented as c0*27+c1*9+c2*3+c3.
51  * This table allows conversion from a value back to a vector.
52  */
53 static const uint8_t modulo_three_table[108] = {
54  0x00, 0x01, 0x02, 0x04, 0x05, 0x06, 0x08, 0x09, 0x0A,
55  0x10, 0x11, 0x12, 0x14, 0x15, 0x16, 0x18, 0x19, 0x1A,
56  0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x28, 0x29, 0x2A,
57 
58  0x40, 0x41, 0x42, 0x44, 0x45, 0x46, 0x48, 0x49, 0x4A,
59  0x50, 0x51, 0x52, 0x54, 0x55, 0x56, 0x58, 0x59, 0x5A,
60  0x60, 0x61, 0x62, 0x64, 0x65, 0x66, 0x68, 0x69, 0x6A,
61 
62  0x80, 0x81, 0x82, 0x84, 0x85, 0x86, 0x88, 0x89, 0x8A,
63  0x90, 0x91, 0x92, 0x94, 0x95, 0x96, 0x98, 0x99, 0x9A,
64  0xA0, 0xA1, 0xA2, 0xA4, 0xA5, 0xA6, 0xA8, 0xA9, 0xAA,
65 
66  0xC0, 0xC1, 0xC2, 0xC4, 0xC5, 0xC6, 0xC8, 0xC9, 0xCA,
67  0xD0, 0xD1, 0xD2, 0xD4, 0xD5, 0xD6, 0xD8, 0xD9, 0xDA,
68  0xE0, 0xE1, 0xE2, 0xE4, 0xE5, 0xE6, 0xE8, 0xE9, 0xEA,
69 };
70 
71 /**
72  * quantizer values used for AC and DC coefficients in chroma blocks
73  */
74 static const uint8_t rv34_chroma_quant[2][32] = {
75  { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
76  16, 17, 17, 18, 19, 20, 20, 21, 22, 22, 23, 23, 24, 24, 25, 25 },
77  { 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
78  14, 15, 15, 16, 17, 18, 18, 19, 20, 20, 21, 21, 22, 22, 23, 23 }
79 };
80 
81 /**
82  * This table is used for dequantizing.
83  */
84 static const uint16_t rv34_qscale_tab[32] = {
85  60, 67, 76, 85, 96, 108, 121, 136,
86  152, 171, 192, 216, 242, 272, 305, 341,
87  383, 432, 481, 544, 606, 683, 767, 854,
88  963, 1074, 1212, 1392, 1566, 1708, 1978, 2211
89 };
90 
91 /**
92  * tables used to translate a quantizer value into a VLC set for decoding
93  * The first table is used for intraframes.
94  */
95 static const uint8_t rv34_quant_to_vlc_set[2][31] = {
96  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1,
97  2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 0 },
98  { 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3,
99  3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6 },
100 };
101 
102 /**
103  * table for obtaining the quantizer difference
104  * @todo Use with ff_modified_quant_tab from h263data.h.
105  */
106 static const uint8_t rv34_dquant_tab[2][32]={
107 // 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
108 {
109  0, 3, 1, 2, 3, 4, 5, 6, 7, 8, 9, 9,10,11,12,13,14,15,16,17,18,18,19,20,21,22,23,24,25,26,27,28
110 },{
111  0, 2, 3, 4, 5, 6, 7, 8, 9,10,11,13,14,15,16,17,18,19,20,21,22,24,25,26,27,28,29,30,31,31,31,26
112 }
113 };
114 
115 /**
116  * maximum number of macroblocks for each of the possible slice offset sizes
117  * @todo This is the same as ff_mba_max, maybe use it instead.
118  */
119 static const uint16_t rv34_mb_max_sizes[6] = { 0x2F, 0x62, 0x18B, 0x62F, 0x18BF, 0x23FF };
120 /**
121  * bits needed to code the slice offset for the given size
122  * @todo This is the same as ff_mba_length, maybe use it instead.
123  */
124 static const uint8_t rv34_mb_bits_sizes[6] = { 6, 7, 9, 11, 13, 14 };
125 
126 #endif /* AVCODEC_RV34DATA_H */
static const uint8_t rv34_chroma_quant[2][32]
quantizer values used for AC and DC coefficients in chroma blocks
Definition: rv34data.h:74
uint8_t
static const uint16_t rv34_mb_max_sizes[6]
maximum number of macroblocks for each of the possible slice offset sizes
Definition: rv34data.h:119
static const uint16_t rv34_qscale_tab[32]
This table is used for dequantizing.
Definition: rv34data.h:84
static const uint8_t rv34_quant_to_vlc_set[2][31]
tables used to translate a quantizer value into a VLC set for decoding The first table is used for in...
Definition: rv34data.h:95
static const uint8_t rv34_dquant_tab[2][32]
table for obtaining the quantizer difference
Definition: rv34data.h:106
static const uint8_t rv34_cbp_code[16]
values used to reconstruct coded block pattern
Definition: rv34data.h:42
static const uint8_t rv34_mb_bits_sizes[6]
bits needed to code the slice offset for the given size
Definition: rv34data.h:124
static const uint8_t modulo_three_table[108]
precalculated results of division by three and modulo three for values 0-107
Definition: rv34data.h:53
static const uint8_t rv34_count_ones[16]
number of ones in nibble minus one
Definition: rv34data.h:35