libavcodec/h261data.h

   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 h261data.h
  24  * H.261 tables.
  25  */
  26 #define MB_TYPE_H261_FIL 0x800000
  27
  28 // H.261 VLC table for macroblock addressing
  29 static const uint8_t h261_mba_code[35] = {
  30      1,  3,  2,  3,
  31      2,  3,  2,  7,
  32      6, 11, 10,  9,
  33      8,  7,  6, 23,
  34     22, 21, 20, 19,
  35     18, 35, 34, 33,
  36     32, 31, 30, 29,
  37     28, 27, 26, 25,
  38     24,
  39     15,           //(MBA stuffing)
  40     1             //(start code)
  41 };
  42
  43 static const uint8_t h261_mba_bits[35] = {
  44      1,  3,  3,  4,
  45      4,  5,  5,  7,
  46      7,  8,  8,  8,
  47      8,  8,  8, 10,
  48     10, 10, 10, 10,
  49     10, 11, 11, 11,
  50     11, 11, 11, 11,
  51     11, 11, 11, 11,
  52     11,
  53     11,           //(MBA stuffing)
  54     16            //(start code)
  55 };
  56
  57 //H.261 VLC table for macroblock type
  58 static const uint8_t h261_mtype_code[10] = {
  59     1,  1,  1,  1,
  60     1,  1,  1,  1,
  61     1,  1
  62 };
  63
  64 static const uint8_t h261_mtype_bits[10] = {
  65     4,  7,  1,  5,
  66     9,  8, 10,  3,
  67     2,  6
  68 };
  69
  70 static const int h261_mtype_map[10]= {
  71         MB_TYPE_INTRA4x4,
  72         MB_TYPE_INTRA4x4  |  MB_TYPE_QUANT,
  73                                                MB_TYPE_CBP,
  74                              MB_TYPE_QUANT  |  MB_TYPE_CBP,
  75                                                                MB_TYPE_16x16,
  76                                                MB_TYPE_CBP  |  MB_TYPE_16x16,
  77                              MB_TYPE_QUANT  |  MB_TYPE_CBP  |  MB_TYPE_16x16,
  78                                                                MB_TYPE_16x16  |  MB_TYPE_H261_FIL,
  79                                                MB_TYPE_CBP  |  MB_TYPE_16x16  |  MB_TYPE_H261_FIL,
  80                              MB_TYPE_QUANT  |  MB_TYPE_CBP  |  MB_TYPE_16x16  |  MB_TYPE_H261_FIL
  81 };
  82
  83 //H.261 VLC table for motion vectors
  84 static const uint8_t h261_mv_tab[17][2] = {
  85     {1,1}, {1,2}, {1,3}, {1,4}, {3,6}, {5,7}, {4,7}, {3,7},
  86     {11,9}, {10,9}, {9,9}, {17,10}, {16,10}, {15,10}, {14,10}, {13,10}, {12,10}
  87 };
  88
  89 static const int mvmap[17] =
  90 {
  91     0, -1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14, -15, -16
  92 };
  93
  94 //H.261 VLC table for coded block pattern
  95 static const uint8_t h261_cbp_tab[63][2] =
  96 {
  97     {11,5}, {9,5}, {13,6}, {13,4}, {23,7}, {19,7}, {31,8}, {12,4},
  98     {22,7}, {18,7}, {30,8}, {19,5}, {27,8}, {23,8}, {19,8}, {11,4},
  99     {21,7}, {17,7}, {29,8}, {17,5}, {25,8}, {21,8}, {17,8}, {15,6},
 100     {15,8}, {13,8}, {3,9}, {15,5}, {11,8}, {7,8}, {7,9}, {10,4},
 101     {20,7}, {16,7}, {28,8}, {14,6}, {14,8}, {12,8}, {2,9}, {16,5},
 102     {24,8}, {20,8}, {16,8}, {14,5}, {10,8}, {6,8}, {6,9}, {18,5},
 103     {26,8}, {22,8}, {18,8}, {13,5}, {9,8}, {5,8}, {5,9}, {12,5},
 104     {8,8}, {4,8}, {4,9}, {7,3}, {10,5}, {8,5}, {12,6}
 105 };
 106
 107 //H.261 VLC table for transform coefficients
 108 static const uint16_t h261_tcoeff_vlc[65][2] = {
 109 { 0x2, 2 }, { 0x3, 2 },{ 0x4, 4 },{ 0x5, 5 },
 110 { 0x6, 7 },{ 0x26, 8 },{ 0x21, 8 },{ 0xa, 10 },
 111 { 0x1d, 12 },{ 0x18, 12 },{ 0x13, 12 },{ 0x10 , 12 },
 112 { 0x1a, 13},{ 0x19, 13 }, { 0x18, 13 }, { 0x17, 13 },
 113 { 0x3, 3 }, { 0x6, 6 }, { 0x25 , 8 }, { 0xc, 10 },
 114 { 0x1b, 12 }, { 0x16, 13 }, { 0x15, 13 }, { 0x5, 4},
 115 { 0x4, 7}, { 0xb, 10 }, { 0x14, 12 }, { 0x14, 13 },
 116 { 0x7, 5 }, { 0x24, 8 }, { 0x1c, 12 }, { 0x13, 13 },
 117 { 0x6, 5 }, { 0xf, 10 }, { 0x12, 12}, { 0x7, 6},
 118 { 0x9 , 10 }, { 0x12, 13 }, { 0x5, 6 }, { 0x1e, 12 },
 119 { 0x4, 6 }, { 0x15, 12 }, { 0x7, 7 }, { 0x11, 12},
 120 { 0x5, 7 }, { 0x11, 13 }, { 0x27, 8 }, { 0x10, 13 },
 121 { 0x23, 8 }, { 0x22, 8 }, { 0x20, 8 }, { 0xe , 10 },
 122 { 0xd, 10 }, { 0x8, 10 },{ 0x1f, 12 }, { 0x1a, 12 },
 123 { 0x19, 12 }, { 0x17, 12 }, { 0x16, 12}, { 0x1f, 13},
 124 { 0x1e, 13 }, { 0x1d, 13 }, { 0x1c, 13}, { 0x1b, 13},
 125 { 0x1, 6 }                                             //escape
 126 };
 127
 128 static const int8_t h261_tcoeff_level[64] = {
 129     0,  1,  2,  3,  4,  5,  6,  7,
 130     8,  9, 10, 11, 12, 13, 14, 15,
 131     1,  2,  3,  4,  5,  6,  7,  1,
 132     2,  3,  4,  5,  1,  2,  3,  4,
 133     1,  2,  3,  1,  2,  3,  1,  2,
 134     1,  2,  1,  2,  1,  2,  1,  2,
 135     1,  1,  1,  1,  1,  1,  1,  1,
 136     1,  1,  1,  1,  1,  1,  1,  1
 137 };
 138
 139 static const int8_t h261_tcoeff_run[64] = {
 140     0,
 141     0,  0,  0,  0,  0,  0,  0,  0,
 142     0,  0,  0,  0,  0,  0,  0,  1,
 143     1,  1,  1,  1,  1,  1,  2,  2,
 144     2,  2,  2,  3,  3,  3,  3,  4,
 145     4,  4,  5,  5,  5,  6,  6,  7,
 146     7,  8,  8,  9,  9, 10, 10, 11,
 147    12, 13, 14, 15, 16, 17, 18, 19,
 148    20, 21, 22, 23, 24, 25, 26
 149 };
 150
 151 static RLTable h261_rl_tcoeff = {
 152     64,
 153     64,
 154     h261_tcoeff_vlc,
 155     h261_tcoeff_run,
 156     h261_tcoeff_level,
 157 };