FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
h261data.c
Go to the documentation of this file.
1 /*
2  * copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
3  * copyright (c) 2004 Maarten Daniels
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  * H.261 tables.
25  */
26 
27 #include <stdint.h>
28 
29 #include "rl.h"
30 #include "h261.h"
31 
32 // H.261 VLC table for macroblock addressing
34  1, 3, 2, 3,
35  2, 3, 2, 7,
36  6, 11, 10, 9,
37  8, 7, 6, 23,
38  22, 21, 20, 19,
39  18, 35, 34, 33,
40  32, 31, 30, 29,
41  28, 27, 26, 25,
42  24,
43  15, // (MBA stuffing)
44  1 // (start code)
45 };
46 
48  1, 3, 3, 4,
49  4, 5, 5, 7,
50  7, 8, 8, 8,
51  8, 8, 8, 10,
52  10, 10, 10, 10,
53  10, 11, 11, 11,
54  11, 11, 11, 11,
55  11, 11, 11, 11,
56  11,
57  11, // (MBA stuffing)
58  16 // (start code)
59 };
60 
61 // H.261 VLC table for macroblock type
63  1, 1, 1, 1,
64  1, 1, 1, 1,
65  1, 1
66 };
67 
69  4, 7, 1, 5,
70  9, 8, 10, 3,
71  2, 6
72 };
73 
74 const int ff_h261_mtype_map[10] = {
78  MB_TYPE_CBP | MB_TYPE_QUANT,
80  MB_TYPE_16x16 | MB_TYPE_CBP,
81  MB_TYPE_16x16 | MB_TYPE_CBP | MB_TYPE_QUANT,
82  MB_TYPE_16x16 | MB_TYPE_H261_FIL,
83  MB_TYPE_16x16 | MB_TYPE_H261_FIL | MB_TYPE_CBP,
84  MB_TYPE_16x16 | MB_TYPE_H261_FIL | MB_TYPE_CBP | MB_TYPE_QUANT
85 };
86 
87 // H.261 VLC table for motion vectors
88 const uint8_t ff_h261_mv_tab[17][2] = {
89  { 1, 1 }, { 1, 2 }, { 1, 3 }, { 1, 4 }, { 3, 6 }, { 5, 7 }, { 4, 7 }, { 3, 7 },
90  { 11, 9 }, { 10, 9 }, { 9, 9 }, { 17, 10 }, { 16, 10 }, { 15, 10 }, { 14, 10 }, { 13, 10 }, { 12, 10 }
91 };
92 
93 // H.261 VLC table for coded block pattern
94 const uint8_t ff_h261_cbp_tab[63][2] = {
95  { 11, 5 }, { 9, 5 }, { 13, 6 }, { 13, 4 }, { 23, 7 }, { 19, 7 }, { 31, 8 }, { 12, 4 },
96  { 22, 7 }, { 18, 7 }, { 30, 8 }, { 19, 5 }, { 27, 8 }, { 23, 8 }, { 19, 8 }, { 11, 4 },
97  { 21, 7 }, { 17, 7 }, { 29, 8 }, { 17, 5 }, { 25, 8 }, { 21, 8 }, { 17, 8 }, { 15, 6 },
98  { 15, 8 }, { 13, 8 }, { 3, 9 }, { 15, 5 }, { 11, 8 }, { 7, 8 }, { 7, 9 }, { 10, 4 },
99  { 20, 7 }, { 16, 7 }, { 28, 8 }, { 14, 6 }, { 14, 8 }, { 12, 8 }, { 2, 9 }, { 16, 5 },
100  { 24, 8 }, { 20, 8 }, { 16, 8 }, { 14, 5 }, { 10, 8 }, { 6, 8 }, { 6, 9 }, { 18, 5 },
101  { 26, 8 }, { 22, 8 }, { 18, 8 }, { 13, 5 }, { 9, 8 }, { 5, 8 }, { 5, 9 }, { 12, 5 },
102  { 8, 8 }, { 4, 8 }, { 4, 9 }, { 7, 3 }, { 10, 5 }, { 8, 5 }, { 12, 6 }
103 };
104 
105 // H.261 VLC table for transform coefficients
106 static const uint16_t h261_tcoeff_vlc[65][2] = {
107  { 0x2, 2 }, { 0x3, 2 }, { 0x4, 4 }, { 0x5, 5 },
108  { 0x6, 7 }, { 0x26, 8 }, { 0x21, 8 }, { 0xa, 10 },
109  { 0x1d, 12 }, { 0x18, 12 }, { 0x13, 12 }, { 0x10, 12 },
110  { 0x1a, 13 }, { 0x19, 13 }, { 0x18, 13 }, { 0x17, 13 },
111  { 0x3, 3 }, { 0x6, 6 }, { 0x25, 8 }, { 0xc, 10 },
112  { 0x1b, 12 }, { 0x16, 13 }, { 0x15, 13 }, { 0x5, 4 },
113  { 0x4, 7 }, { 0xb, 10 }, { 0x14, 12 }, { 0x14, 13 },
114  { 0x7, 5 }, { 0x24, 8 }, { 0x1c, 12 }, { 0x13, 13 },
115  { 0x6, 5 }, { 0xf, 10 }, { 0x12, 12 }, { 0x7, 6 },
116  { 0x9, 10 }, { 0x12, 13 }, { 0x5, 6 }, { 0x1e, 12 },
117  { 0x4, 6 }, { 0x15, 12 }, { 0x7, 7 }, { 0x11, 12 },
118  { 0x5, 7 }, { 0x11, 13 }, { 0x27, 8 }, { 0x10, 13 },
119  { 0x23, 8 }, { 0x22, 8 }, { 0x20, 8 }, { 0xe, 10 },
120  { 0xd, 10 }, { 0x8, 10 }, { 0x1f, 12 }, { 0x1a, 12 },
121  { 0x19, 12 }, { 0x17, 12 }, { 0x16, 12 }, { 0x1f, 13 },
122  { 0x1e, 13 }, { 0x1d, 13 }, { 0x1c, 13 }, { 0x1b, 13 },
123  { 0x1, 6 } // escape
124 };
125 
126 static const int8_t h261_tcoeff_level[64] = {
127  0, 1, 2, 3, 4, 5, 6, 7,
128  8, 9, 10, 11, 12, 13, 14, 15,
129  1, 2, 3, 4, 5, 6, 7, 1,
130  2, 3, 4, 5, 1, 2, 3, 4,
131  1, 2, 3, 1, 2, 3, 1, 2,
132  1, 2, 1, 2, 1, 2, 1, 2,
133  1, 1, 1, 1, 1, 1, 1, 1,
134  1, 1, 1, 1, 1, 1, 1, 1
135 };
136 
137 static const int8_t h261_tcoeff_run[64] = {
138  0,
139  0, 0, 0, 0, 0, 0, 0, 0,
140  0, 0, 0, 0, 0, 0, 0, 1,
141  1, 1, 1, 1, 1, 1, 2, 2,
142  2, 2, 2, 3, 3, 3, 3, 4,
143  4, 4, 5, 5, 5, 6, 6, 7,
144  7, 8, 8, 9, 9, 10, 10, 11,
145  12, 13, 14, 15, 16, 17, 18, 19,
146  20, 21, 22, 23, 24, 25, 26
147 };
148 
150  64,
151  64,
155 };