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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] = { | |
76 | MB_TYPE_INTRA4x4, | |
77 | MB_TYPE_INTRA4x4 | MB_TYPE_QUANT, | |
78 | MB_TYPE_CBP, | |
79 | MB_TYPE_CBP | MB_TYPE_QUANT, | |
80 | MB_TYPE_16x16, | |
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 | ||
150 | RLTable ff_h261_rl_tcoeff = { | |
151 | 64, | |
152 | 64, | |
153 | h261_tcoeff_vlc, | |
154 | h261_tcoeff_run, | |
155 | h261_tcoeff_level, | |
156 | }; |