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 libavcodec/h261data.h
24 * H.261 tables.
25 */
26
27#ifndef AVCODEC_H261DATA_H
28#define AVCODEC_H261DATA_H
29
30#include <stdint.h>
31#include "h261.h"
32
33// H.261 VLC table for macroblock addressing
34static const uint8_t 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
48static const uint8_t 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
63static const uint8_t h261_mtype_code[10] = {
64    1,  1,  1,  1,
65    1,  1,  1,  1,
66    1,  1
67};
68
69static const uint8_t h261_mtype_bits[10] = {
70    4,  7,  1,  5,
71    9,  8, 10,  3,
72    2,  6
73};
74
75static const int h261_mtype_map[10]= {
76        MB_TYPE_INTRA4x4,
77        MB_TYPE_INTRA4x4  |  MB_TYPE_QUANT,
78                                               MB_TYPE_CBP,
79                             MB_TYPE_QUANT  |  MB_TYPE_CBP,
80                                                               MB_TYPE_16x16,
81                                               MB_TYPE_CBP  |  MB_TYPE_16x16,
82                             MB_TYPE_QUANT  |  MB_TYPE_CBP  |  MB_TYPE_16x16,
83                                                               MB_TYPE_16x16  |  MB_TYPE_H261_FIL,
84                                               MB_TYPE_CBP  |  MB_TYPE_16x16  |  MB_TYPE_H261_FIL,
85                             MB_TYPE_QUANT  |  MB_TYPE_CBP  |  MB_TYPE_16x16  |  MB_TYPE_H261_FIL
86};
87
88//H.261 VLC table for motion vectors
89static const uint8_t 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
94static const int mvmap[17] =
95{
96    0, -1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14, -15, -16
97};
98
99//H.261 VLC table for coded block pattern
100static const uint8_t h261_cbp_tab[63][2] =
101{
102    {11,5}, {9,5}, {13,6}, {13,4}, {23,7}, {19,7}, {31,8}, {12,4},
103    {22,7}, {18,7}, {30,8}, {19,5}, {27,8}, {23,8}, {19,8}, {11,4},
104    {21,7}, {17,7}, {29,8}, {17,5}, {25,8}, {21,8}, {17,8}, {15,6},
105    {15,8}, {13,8}, {3,9}, {15,5}, {11,8}, {7,8}, {7,9}, {10,4},
106    {20,7}, {16,7}, {28,8}, {14,6}, {14,8}, {12,8}, {2,9}, {16,5},
107    {24,8}, {20,8}, {16,8}, {14,5}, {10,8}, {6,8}, {6,9}, {18,5},
108    {26,8}, {22,8}, {18,8}, {13,5}, {9,8}, {5,8}, {5,9}, {12,5},
109    {8,8}, {4,8}, {4,9}, {7,3}, {10,5}, {8,5}, {12,6}
110};
111
112//H.261 VLC table for transform coefficients
113static const uint16_t h261_tcoeff_vlc[65][2] = {
114{ 0x2, 2 }, { 0x3, 2 },{ 0x4, 4 },{ 0x5, 5 },
115{ 0x6, 7 },{ 0x26, 8 },{ 0x21, 8 },{ 0xa, 10 },
116{ 0x1d, 12 },{ 0x18, 12 },{ 0x13, 12 },{ 0x10 , 12 },
117{ 0x1a, 13},{ 0x19, 13 }, { 0x18, 13 }, { 0x17, 13 },
118{ 0x3, 3 }, { 0x6, 6 }, { 0x25 , 8 }, { 0xc, 10 },
119{ 0x1b, 12 }, { 0x16, 13 }, { 0x15, 13 }, { 0x5, 4},
120{ 0x4, 7}, { 0xb, 10 }, { 0x14, 12 }, { 0x14, 13 },
121{ 0x7, 5 }, { 0x24, 8 }, { 0x1c, 12 }, { 0x13, 13 },
122{ 0x6, 5 }, { 0xf, 10 }, { 0x12, 12}, { 0x7, 6},
123{ 0x9 , 10 }, { 0x12, 13 }, { 0x5, 6 }, { 0x1e, 12 },
124{ 0x4, 6 }, { 0x15, 12 }, { 0x7, 7 }, { 0x11, 12},
125{ 0x5, 7 }, { 0x11, 13 }, { 0x27, 8 }, { 0x10, 13 },
126{ 0x23, 8 }, { 0x22, 8 }, { 0x20, 8 }, { 0xe , 10 },
127{ 0xd, 10 }, { 0x8, 10 },{ 0x1f, 12 }, { 0x1a, 12 },
128{ 0x19, 12 }, { 0x17, 12 }, { 0x16, 12}, { 0x1f, 13},
129{ 0x1e, 13 }, { 0x1d, 13 }, { 0x1c, 13}, { 0x1b, 13},
130{ 0x1, 6 }                                             //escape
131};
132
133static const int8_t h261_tcoeff_level[64] = {
134    0,  1,  2,  3,  4,  5,  6,  7,
135    8,  9, 10, 11, 12, 13, 14, 15,
136    1,  2,  3,  4,  5,  6,  7,  1,
137    2,  3,  4,  5,  1,  2,  3,  4,
138    1,  2,  3,  1,  2,  3,  1,  2,
139    1,  2,  1,  2,  1,  2,  1,  2,
140    1,  1,  1,  1,  1,  1,  1,  1,
141    1,  1,  1,  1,  1,  1,  1,  1
142};
143
144static const int8_t h261_tcoeff_run[64] = {
145    0,
146    0,  0,  0,  0,  0,  0,  0,  0,
147    0,  0,  0,  0,  0,  0,  0,  1,
148    1,  1,  1,  1,  1,  1,  2,  2,
149    2,  2,  2,  3,  3,  3,  3,  4,
150    4,  4,  5,  5,  5,  6,  6,  7,
151    7,  8,  8,  9,  9, 10, 10, 11,
152   12, 13, 14, 15, 16, 17, 18, 19,
153   20, 21, 22, 23, 24, 25, 26
154};
155
156static RLTable h261_rl_tcoeff = {
157    64,
158    64,
159    h261_tcoeff_vlc,
160    h261_tcoeff_run,
161    h261_tcoeff_level,
162};
163
164#endif /* AVCODEC_H261DATA_H */
165