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
34 const uint8_t ff_h261_mba_code[35] = {
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 
48 const uint8_t ff_h261_mba_bits[35] = {
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
63 const uint8_t ff_h261_mtype_code[10] = {
64  1, 1, 1, 1,
65  1, 1, 1, 1,
66  1, 1
67 };
68 
69 const uint8_t ff_h261_mtype_bits[10] = {
70  4, 7, 1, 5,
71  9, 8, 10, 3,
72  2, 6
73 };
74 
75 const int ff_h261_mtype_map[10] = {
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 };
h261_tcoeff_level
static const int8_t h261_tcoeff_level[64]
Definition: h261data.c:127
MB_TYPE_INTRA4x4
#define MB_TYPE_INTRA4x4
Definition: mpegutils.h:44
MB_TYPE_16x16
#define MB_TYPE_16x16
Definition: mpegutils.h:47
mpegutils.h
h261.h
ff_h261_mv_tab
const uint8_t ff_h261_mv_tab[17][2]
Definition: h261data.c:89
RLTable
RLTable.
Definition: rl.h:39
ff_h261_cbp_tab
const uint8_t ff_h261_cbp_tab[63][2]
Definition: h261data.c:95
MB_TYPE_CBP
#define MB_TYPE_CBP
Definition: mpegutils.h:64
ff_h261_mba_bits
const uint8_t ff_h261_mba_bits[35]
Definition: h261data.c:48
MB_TYPE_QUANT
#define MB_TYPE_QUANT
Definition: mpegutils.h:63
ff_h261_mtype_map
const int ff_h261_mtype_map[10]
Definition: h261data.c:75
ff_h261_mtype_code
const uint8_t ff_h261_mtype_code[10]
Definition: h261data.c:63
ff_h261_mtype_bits
const uint8_t ff_h261_mtype_bits[10]
Definition: h261data.c:69
h261_tcoeff_vlc
static const uint16_t h261_tcoeff_vlc[65][2]
Definition: h261data.c:107
ff_h261_rl_tcoeff
RLTable ff_h261_rl_tcoeff
Definition: h261data.c:150
h261_tcoeff_run
static const int8_t h261_tcoeff_run[64]
Definition: h261data.c:138
ff_h261_mba_code
const uint8_t ff_h261_mba_code[35]
Definition: h261data.c:34
rl.h
MB_TYPE_H261_FIL
#define MB_TYPE_H261_FIL
Definition: h261.h:41