h261 decoder by (Maarten Daniels <maarten.daniels at student dot luc dot ac dot be>)
[libav.git] / libavcodec / h261data.h
1 /**
2 * @file h261data.h
3 * H.261 tables.
4 */
5 #define MB_TYPE_H261_FIL 0x800000
6
7 // H.261 VLC table for macroblock addressing
8 const uint8_t h261_mba_code[34] = {
9 1, 3, 2, 3,
10 2, 3, 2, 7,
11 6, 11, 10, 9,
12 8, 7, 6, 23,
13 22, 21, 20, 19,
14 18, 35, 34, 33,
15 32, 31, 30, 29,
16 28, 27, 26, 25,
17 24,
18 15 //(MBA stuffing)
19 };
20
21 const uint8_t h261_mba_bits[34] = {
22 1, 3, 3, 4,
23 4, 5, 5, 7,
24 7, 8, 8, 8,
25 8, 8, 8, 10,
26 10, 10, 10, 10,
27 10, 11, 11, 11,
28 11, 11, 11, 11,
29 11, 11, 11, 11,
30 11,
31 11 //(MBA stuffing)
32 };
33
34 //H.261 VLC table for macroblock type
35 const uint8_t h261_mtype_code[10] = {
36 1, 1, 1, 1,
37 1, 1, 1, 1,
38 1, 1
39 };
40
41 const uint8_t h261_mtype_bits[10] = {
42 4, 7, 1, 5,
43 9, 8, 10, 3,
44 2, 6
45 };
46
47 static const int h261_mtype_map[10]= {
48 MB_TYPE_INTRA4x4,
49 MB_TYPE_INTRA4x4 | MB_TYPE_QUANT,
50 MB_TYPE_CBP,
51 MB_TYPE_QUANT | MB_TYPE_CBP,
52 MB_TYPE_16x16,
53 MB_TYPE_CBP | MB_TYPE_16x16,
54 MB_TYPE_QUANT | MB_TYPE_CBP | MB_TYPE_16x16,
55 MB_TYPE_16x16 | MB_TYPE_H261_FIL,
56 MB_TYPE_CBP | MB_TYPE_16x16 | MB_TYPE_H261_FIL,
57 MB_TYPE_QUANT | MB_TYPE_CBP | MB_TYPE_16x16 | MB_TYPE_H261_FIL
58 };
59
60 //H.261 VLC table for motion vectors
61 const uint8_t h261_mv_tab[17][2] = {
62 {1,1}, {1,2}, {1,3}, {1,4}, {3,6}, {5,7}, {4,7}, {3,7},
63 {11,9}, {10,9}, {9,9}, {17,10}, {16,10}, {15,10}, {14,10}, {13,10}, {12,10}
64 };
65
66 static const int mvmap[17] =
67 {
68 0, -1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14, -15, 16
69 };
70
71 //H.261 VLC table for coded block pattern
72 const uint8_t h261_cbp_tab[63][2] =
73 {
74 {11,5}, {9,5}, {13,6}, {13,4}, {23,7}, {19,7}, {31,8}, {12,4},
75 {22,7}, {18,7}, {30,8}, {19,5}, {27,8}, {23,8}, {19,8}, {11,4},
76 {21,7}, {17,7}, {29,8}, {17,5}, {25,8}, {21,8}, {17,8}, {15,6},
77 {15,8}, {13,8}, {3,9}, {15,5}, {11,8}, {7,8}, {7,9}, {10,4},
78 {20,7}, {16,7}, {28,8}, {14,6}, {14,8}, {12,8}, {2,9}, {16,5},
79 {24,8}, {20,8}, {16,8}, {14,5}, {10,8}, {6,8}, {6,9}, {18,5},
80 {26,8}, {22,8}, {18,8}, {13,5}, {9,8}, {5,8}, {5,9}, {12,5},
81 {8,8}, {4,8}, {4,9}, {7,3}, {10,5}, {8,5}, {12,6}
82 };
83
84 //H.261 VLC table for transform coefficients
85 const uint16_t h261_tcoeff_vlc[65][2] = {
86 { 0x2, 2 }, { 0x3, 2 },{ 0x4, 4 },{ 0x5, 5 },
87 { 0x6, 7 },{ 0x26, 8 },{ 0x21, 8 },{ 0xa, 10 },
88 { 0x1d, 12 },{ 0x18, 12 },{ 0x13, 12 },{ 0x10 , 12 },
89 { 0x1a, 13},{ 0x19, 13 }, { 0x18, 13 }, { 0x17, 13 },
90 { 0x3, 3 }, { 0x6, 6 }, { 0x25 , 8 }, { 0xc, 10 },
91 { 0x1b, 12 }, { 0x16, 13 }, { 0x15, 13 }, { 0x5, 4},
92 { 0x4, 7}, { 0xb, 10 }, { 0x14, 12 }, { 0x14, 13 },
93 { 0x7, 5 }, { 0x24, 8 }, { 0x1c, 12 }, { 0x13, 13 },
94 { 0x6, 5 }, { 0xf, 10 }, { 0x12, 12}, { 0x7, 6},
95 { 0x9 , 10 }, { 0x12, 13 }, { 0x5, 6 }, { 0x1e, 12 },
96 { 0x4, 6 }, { 0x15, 12 }, { 0x7, 7 }, { 0x11, 12},
97 { 0x5, 7 }, { 0x11, 13 }, { 0x27, 8 }, { 0x10, 13 },
98 { 0x23, 8 }, { 0x22, 8 }, { 0x20, 8 }, { 0xe , 10 },
99 { 0xd, 10 }, { 0x8, 10 },{ 0x1f, 12 }, { 0x1a, 12 },
100 { 0x19, 12 }, { 0x17, 12 }, { 0x16, 12}, { 0x1f, 13},
101 { 0x1e, 13 }, { 0x1d, 13 }, { 0x1c, 13}, { 0x1b, 13},
102 { 0x1, 6 } //escape
103 };
104
105 const int8_t h261_tcoeff_level[64] = {
106 0, 1, 2, 3, 4, 5, 6, 7,
107 8, 9, 10, 11, 12, 13, 14, 15,
108 1, 2, 3, 4, 5, 6, 7, 1,
109 2, 3, 4, 5, 1, 2, 3, 4,
110 1, 2, 3, 1, 2, 3, 1, 2,
111 1, 2, 1, 2, 1, 2, 1, 2,
112 1, 1, 1, 1, 1, 1, 1, 1,
113 1, 1, 1, 1, 1, 1, 1, 1
114 };
115
116 const int8_t h261_tcoeff_run[64] = {
117 0,
118 0, 0, 0, 0, 0, 0, 0, 0,
119 0, 0, 0, 0, 0, 0, 0, 1,
120 1, 1, 1, 1, 1, 1, 2, 2,
121 2, 2, 2, 3, 3, 3, 3, 4,
122 4, 4, 5, 5, 5, 6, 6, 7,
123 7, 8, 8, 9, 9, 10, 10, 11,
124 12, 13, 14, 15, 16, 17, 18, 19,
125 20, 21, 22, 23, 24, 25, 26
126 };
127
128 static RLTable h261_rl_tcoeff = {
129 64,
130 64,
131 h261_tcoeff_vlc,
132 h261_tcoeff_run,
133 h261_tcoeff_level,
134 };