FFmpeg
h261data.c
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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 "mpegutils.h"
30 #include "rl.h"
31 #include "h261.h"
32 
33 // H.261 VLC table for macroblock addressing
35  1, 3, 2, 3,
36  2, 3, 2, 7,
37  6, 11, 10, 9,
38  8, 7, 6, 23,
39  22, 21, 20, 19,
40  18, 35, 34, 33,
41  32, 31, 30, 29,
42  28, 27, 26, 25,
43  24,
44  15, // (MBA stuffing)
45  1 // (start code)
46 };
47 
49  1, 3, 3, 4,
50  4, 5, 5, 7,
51  7, 8, 8, 8,
52  8, 8, 8, 10,
53  10, 10, 10, 10,
54  10, 11, 11, 11,
55  11, 11, 11, 11,
56  11, 11, 11, 11,
57  11,
58  11, // (MBA stuffing)
59  16 // (start code)
60 };
61 
62 // H.261 VLC table for macroblock type
64  1, 1, 1, 1,
65  1, 1, 1, 1,
66  1, 1
67 };
68 
70  4, 7, 1, 5,
71  9, 8, 10, 3,
72  2, 6
73 };
74 
75 const int ff_h261_mtype_map[10] = {
79  MB_TYPE_CBP | MB_TYPE_QUANT,
81  MB_TYPE_16x16 | MB_TYPE_CBP,
82  MB_TYPE_16x16 | MB_TYPE_CBP | MB_TYPE_QUANT,
83  MB_TYPE_16x16 | MB_TYPE_H261_FIL,
84  MB_TYPE_16x16 | MB_TYPE_H261_FIL | MB_TYPE_CBP,
85  MB_TYPE_16x16 | MB_TYPE_H261_FIL | MB_TYPE_CBP | MB_TYPE_QUANT
86 };
87 
88 // H.261 VLC table for motion vectors
89 const uint8_t ff_h261_mv_tab[17][2] = {
90  { 1, 1 }, { 1, 2 }, { 1, 3 }, { 1, 4 }, { 3, 6 }, { 5, 7 }, { 4, 7 }, { 3, 7 },
91  { 11, 9 }, { 10, 9 }, { 9, 9 }, { 17, 10 }, { 16, 10 }, { 15, 10 }, { 14, 10 }, { 13, 10 }, { 12, 10 }
92 };
93 
94 // H.261 VLC table for coded block pattern
95 const uint8_t ff_h261_cbp_tab[63][2] = {
96  { 11, 5 }, { 9, 5 }, { 13, 6 }, { 13, 4 }, { 23, 7 }, { 19, 7 }, { 31, 8 }, { 12, 4 },
97  { 22, 7 }, { 18, 7 }, { 30, 8 }, { 19, 5 }, { 27, 8 }, { 23, 8 }, { 19, 8 }, { 11, 4 },
98  { 21, 7 }, { 17, 7 }, { 29, 8 }, { 17, 5 }, { 25, 8 }, { 21, 8 }, { 17, 8 }, { 15, 6 },
99  { 15, 8 }, { 13, 8 }, { 3, 9 }, { 15, 5 }, { 11, 8 }, { 7, 8 }, { 7, 9 }, { 10, 4 },
100  { 20, 7 }, { 16, 7 }, { 28, 8 }, { 14, 6 }, { 14, 8 }, { 12, 8 }, { 2, 9 }, { 16, 5 },
101  { 24, 8 }, { 20, 8 }, { 16, 8 }, { 14, 5 }, { 10, 8 }, { 6, 8 }, { 6, 9 }, { 18, 5 },
102  { 26, 8 }, { 22, 8 }, { 18, 8 }, { 13, 5 }, { 9, 8 }, { 5, 8 }, { 5, 9 }, { 12, 5 },
103  { 8, 8 }, { 4, 8 }, { 4, 9 }, { 7, 3 }, { 10, 5 }, { 8, 5 }, { 12, 6 }
104 };
105 
106 // H.261 VLC table for transform coefficients
107 static const uint16_t h261_tcoeff_vlc[65][2] = {
108  { 0x2, 2 }, { 0x3, 2 }, { 0x4, 4 }, { 0x5, 5 },
109  { 0x6, 7 }, { 0x26, 8 }, { 0x21, 8 }, { 0xa, 10 },
110  { 0x1d, 12 }, { 0x18, 12 }, { 0x13, 12 }, { 0x10, 12 },
111  { 0x1a, 13 }, { 0x19, 13 }, { 0x18, 13 }, { 0x17, 13 },
112  { 0x3, 3 }, { 0x6, 6 }, { 0x25, 8 }, { 0xc, 10 },
113  { 0x1b, 12 }, { 0x16, 13 }, { 0x15, 13 }, { 0x5, 4 },
114  { 0x4, 7 }, { 0xb, 10 }, { 0x14, 12 }, { 0x14, 13 },
115  { 0x7, 5 }, { 0x24, 8 }, { 0x1c, 12 }, { 0x13, 13 },
116  { 0x6, 5 }, { 0xf, 10 }, { 0x12, 12 }, { 0x7, 6 },
117  { 0x9, 10 }, { 0x12, 13 }, { 0x5, 6 }, { 0x1e, 12 },
118  { 0x4, 6 }, { 0x15, 12 }, { 0x7, 7 }, { 0x11, 12 },
119  { 0x5, 7 }, { 0x11, 13 }, { 0x27, 8 }, { 0x10, 13 },
120  { 0x23, 8 }, { 0x22, 8 }, { 0x20, 8 }, { 0xe, 10 },
121  { 0xd, 10 }, { 0x8, 10 }, { 0x1f, 12 }, { 0x1a, 12 },
122  { 0x19, 12 }, { 0x17, 12 }, { 0x16, 12 }, { 0x1f, 13 },
123  { 0x1e, 13 }, { 0x1d, 13 }, { 0x1c, 13 }, { 0x1b, 13 },
124  { 0x1, 6 } // escape
125 };
126 
127 static const int8_t h261_tcoeff_level[64] = {
128  0, 1, 2, 3, 4, 5, 6, 7,
129  8, 9, 10, 11, 12, 13, 14, 15,
130  1, 2, 3, 4, 5, 6, 7, 1,
131  2, 3, 4, 5, 1, 2, 3, 4,
132  1, 2, 3, 1, 2, 3, 1, 2,
133  1, 2, 1, 2, 1, 2, 1, 2,
134  1, 1, 1, 1, 1, 1, 1, 1,
135  1, 1, 1, 1, 1, 1, 1, 1
136 };
137 
138 static const int8_t h261_tcoeff_run[64] = {
139  0,
140  0, 0, 0, 0, 0, 0, 0, 0,
141  0, 0, 0, 0, 0, 0, 0, 1,
142  1, 1, 1, 1, 1, 1, 2, 2,
143  2, 2, 2, 3, 3, 3, 3, 4,
144  4, 4, 5, 5, 5, 6, 6, 7,
145  7, 8, 8, 9, 9, 10, 10, 11,
146  12, 13, 14, 15, 16, 17, 18, 19,
147  20, 21, 22, 23, 24, 25, 26
148 };
149 
151  64,
152  64,
156 };
static const uint16_t h261_tcoeff_vlc[65][2]
Definition: h261data.c:107
#define MB_TYPE_INTRA4x4
Definition: mpegutils.h:51
RLTable.
Definition: rl.h:39
const uint8_t ff_h261_mtype_code[10]
Definition: h261data.c:63
static const int8_t h261_tcoeff_run[64]
Definition: h261data.c:138
RLTable ff_h261_rl_tcoeff
Definition: h261data.c:150
uint8_t
#define MB_TYPE_16x16
Definition: mpegutils.h:54
static const int8_t h261_tcoeff_level[64]
Definition: h261data.c:127
const uint8_t ff_h261_mba_code[35]
Definition: h261data.c:34
#define MB_TYPE_QUANT
Definition: mpegutils.h:70
const int ff_h261_mtype_map[10]
Definition: h261data.c:75
#define MB_TYPE_CBP
Definition: mpegutils.h:71
const uint8_t ff_h261_cbp_tab[63][2]
Definition: h261data.c:95
rl header.
H.261 codec.
const uint8_t ff_h261_mba_bits[35]
Definition: h261data.c:48
const uint8_t ff_h261_mv_tab[17][2]
Definition: h261data.c:89
#define MB_TYPE_H261_FIL
Definition: h261.h:49
const uint8_t ff_h261_mtype_bits[10]
Definition: h261data.c:69