h261data.c 5.01 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
/*
 * copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
 * copyright (c) 2004 Maarten Daniels
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * H.261 tables.
 */

#include <stdint.h>

29
#include "mpegutils.h"
30
#include "rl.h"
31
#include "h261.h"
32

33 34 35 36 37 38 39 40 41 42 43
// H.261 VLC table for macroblock addressing
const uint8_t ff_h261_mba_code[35] = {
     1,  3,  2,  3,
     2,  3,  2,  7,
     6, 11, 10,  9,
     8,  7,  6, 23,
    22, 21, 20, 19,
    18, 35, 34, 33,
    32, 31, 30, 29,
    28, 27, 26, 25,
    24,
44 45
    15, // (MBA stuffing)
     1  // (start code)
46 47 48 49 50 51 52 53 54 55 56 57
};

const uint8_t ff_h261_mba_bits[35] = {
     1,  3,  3,  4,
     4,  5,  5,  7,
     7,  8,  8,  8,
     8,  8,  8, 10,
    10, 10, 10, 10,
    10, 11, 11, 11,
    11, 11, 11, 11,
    11, 11, 11, 11,
    11,
58 59
    11, // (MBA stuffing)
    16  // (start code)
60 61
};

62
// H.261 VLC table for macroblock type
63
const uint8_t ff_h261_mtype_code[10] = {
64 65 66
    1, 1, 1, 1,
    1, 1, 1, 1,
    1, 1
67 68 69
};

const uint8_t ff_h261_mtype_bits[10] = {
70 71 72
    4, 7,  1, 5,
    9, 8, 10, 3,
    2, 6
73 74
};

75 76 77 78 79 80 81 82 83 84 85
const int ff_h261_mtype_map[10] = {
    MB_TYPE_INTRA4x4,
    MB_TYPE_INTRA4x4 | MB_TYPE_QUANT,
    MB_TYPE_CBP,
    MB_TYPE_CBP | MB_TYPE_QUANT,
    MB_TYPE_16x16,
    MB_TYPE_16x16 | MB_TYPE_CBP,
    MB_TYPE_16x16 | MB_TYPE_CBP | MB_TYPE_QUANT,
    MB_TYPE_16x16 | MB_TYPE_H261_FIL,
    MB_TYPE_16x16 | MB_TYPE_H261_FIL | MB_TYPE_CBP,
    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 91
    {  1, 1 }, {  1, 2 }, { 1, 3 }, {  1,  4 }, {  3,  6 }, {  5,  7 }, {  4,  7 }, {  3,  7 },
    { 11, 9 }, { 10, 9 }, { 9, 9 }, { 17, 10 }, { 16, 10 }, { 15, 10 }, { 14, 10 }, { 13, 10 }, { 12, 10 }
92 93
};

94 95 96 97 98 99 100 101 102 103
// H.261 VLC table for coded block pattern
const uint8_t ff_h261_cbp_tab[63][2] = {
    { 11, 5 }, {  9, 5 }, { 13, 6 }, { 13, 4 }, { 23, 7 }, { 19, 7 }, { 31, 8 }, { 12, 4 },
    { 22, 7 }, { 18, 7 }, { 30, 8 }, { 19, 5 }, { 27, 8 }, { 23, 8 }, { 19, 8 }, { 11, 4 },
    { 21, 7 }, { 17, 7 }, { 29, 8 }, { 17, 5 }, { 25, 8 }, { 21, 8 }, { 17, 8 }, { 15, 6 },
    { 15, 8 }, { 13, 8 }, {  3, 9 }, { 15, 5 }, { 11, 8 }, {  7, 8 }, {  7, 9 }, { 10, 4 },
    { 20, 7 }, { 16, 7 }, { 28, 8 }, { 14, 6 }, { 14, 8 }, { 12, 8 }, {  2, 9 }, { 16, 5 },
    { 24, 8 }, { 20, 8 }, { 16, 8 }, { 14, 5 }, { 10, 8 }, {  6, 8 }, {  6, 9 }, { 18, 5 },
    { 26, 8 }, { 22, 8 }, { 18, 8 }, { 13, 5 }, {  9, 8 }, {  5, 8 }, {  5, 9 }, { 12, 5 },
    {  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] = {
108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124
    {  0x2,  2 }, {  0x3,  2 }, {  0x4,  4 }, {  0x5,  5 },
    {  0x6,  7 }, { 0x26,  8 }, { 0x21,  8 }, {  0xa, 10 },
    { 0x1d, 12 }, { 0x18, 12 }, { 0x13, 12 }, { 0x10, 12 },
    { 0x1a, 13 }, { 0x19, 13 }, { 0x18, 13 }, { 0x17, 13 },
    {  0x3,  3 }, {  0x6,  6 }, { 0x25,  8 }, {  0xc, 10 },
    { 0x1b, 12 }, { 0x16, 13 }, { 0x15, 13 }, {  0x5,  4 },
    {  0x4,  7 }, {  0xb, 10 }, { 0x14, 12 }, { 0x14, 13 },
    {  0x7,  5 }, { 0x24,  8 }, { 0x1c, 12 }, { 0x13, 13 },
    {  0x6,  5 }, {  0xf, 10 }, { 0x12, 12 }, {  0x7,  6 },
    {  0x9, 10 }, { 0x12, 13 }, {  0x5,  6 }, { 0x1e, 12 },
    {  0x4,  6 }, { 0x15, 12 }, {  0x7,  7 }, { 0x11, 12 },
    {  0x5,  7 }, { 0x11, 13 }, { 0x27,  8 }, { 0x10, 13 },
    { 0x23,  8 }, { 0x22,  8 }, { 0x20,  8 }, {  0xe, 10 },
    {  0xd, 10 }, {  0x8, 10 }, { 0x1f, 12 }, { 0x1a, 12 },
    { 0x19, 12 }, { 0x17, 12 }, { 0x16, 12 }, { 0x1f, 13 },
    { 0x1e, 13 }, { 0x1d, 13 }, { 0x1c, 13 }, { 0x1b, 13 },
    {  0x1,  6 }  // escape
125 126 127
};

static const int8_t h261_tcoeff_level[64] = {
128 129 130 131 132 133 134 135
    0, 1,  2,  3,  4,  5,  6,  7,
    8, 9, 10, 11, 12, 13, 14, 15,
    1, 2,  3,  4,  5,  6,  7,  1,
    2, 3,  4,  5,  1,  2,  3,  4,
    1, 2,  3,  1,  2,  3,  1,  2,
    1, 2,  1,  2,  1,  2,  1,  2,
    1, 1,  1,  1,  1,  1,  1,  1,
    1, 1,  1,  1,  1,  1,  1,  1
136 137 138
};

static const int8_t h261_tcoeff_run[64] = {
139 140 141 142 143 144 145 146 147
     0,
     0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  0,  0,  0,  1,
     1,  1,  1,  1,  1,  1,  2,  2,
     2,  2,  2,  3,  3,  3,  3,  4,
     4,  4,  5,  5,  5,  6,  6,  7,
     7,  8,  8,  9,  9, 10, 10, 11,
    12, 13, 14, 15, 16, 17, 18, 19,
    20, 21, 22, 23, 24, 25, 26
148 149 150 151 152 153 154 155 156
};

RLTable ff_h261_rl_tcoeff = {
    64,
    64,
    h261_tcoeff_vlc,
    h261_tcoeff_run,
    h261_tcoeff_level,
};