2 * copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
3 * copyright (c) 2004 Maarten Daniels
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #define MB_TYPE_H261_FIL 0x800000
26 // H.261 VLC table for macroblock addressing
27 const uint8_t h261_mba_code[35] = {
41 const uint8_t h261_mba_bits[35] = {
55 //H.261 VLC table for macroblock type
56 const uint8_t h261_mtype_code[10] = {
62 const uint8_t h261_mtype_bits[10] = {
68 static const int h261_mtype_map[10]= {
70 MB_TYPE_INTRA4x4 | MB_TYPE_QUANT,
72 MB_TYPE_QUANT | MB_TYPE_CBP,
74 MB_TYPE_CBP | MB_TYPE_16x16,
75 MB_TYPE_QUANT | MB_TYPE_CBP | MB_TYPE_16x16,
76 MB_TYPE_16x16 | MB_TYPE_H261_FIL,
77 MB_TYPE_CBP | MB_TYPE_16x16 | MB_TYPE_H261_FIL,
78 MB_TYPE_QUANT | MB_TYPE_CBP | MB_TYPE_16x16 | MB_TYPE_H261_FIL
81 //H.261 VLC table for motion vectors
82 const uint8_t h261_mv_tab[17][2] = {
83 {1,1}, {1,2}, {1,3}, {1,4}, {3,6}, {5,7}, {4,7}, {3,7},
84 {11,9}, {10,9}, {9,9}, {17,10}, {16,10}, {15,10}, {14,10}, {13,10}, {12,10}
87 static const int mvmap[17] =
89 0, -1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14, -15, -16
92 //H.261 VLC table for coded block pattern
93 const uint8_t 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}
105 //H.261 VLC table for transform coefficients
106 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},
126 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
137 const int8_t h261_tcoeff_run[64] = {
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
149 static RLTable h261_rl_tcoeff = {