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
  27 #ifndef FFMPEG_H261DATA_H
  28 #define FFMPEG_H261DATA_H
  29
  30 #include <stdint.h>
  31 #include "h261.h"
  32
  33 // H.261 VLC table for macroblock addressing
  34 static 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
  48 static 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
  63 static const uint8_t h261_mtype_code[10] = {
  64     1,  1,  1,  1,
  65     1,  1,  1,  1,
  66     1,  1
  67 };
  68
  69 static const uint8_t h261_mtype_bits[10] = {
  70     4,  7,  1,  5,
  71     9,  8, 10,  3,
  72     2,  6
  73 };
  74
  75 static 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
  89 static 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
  94 static 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
 100 static 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
 113 static 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
 133 static 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
 144 static 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
 156 static RLTable h261_rl_tcoeff = {
 157     64,
 158     64,
 159     h261_tcoeff_vlc,
 160     h261_tcoeff_run,
 161     h261_tcoeff_level,
 162 };
 163
 164 #endif /* FFMPEG_H261DATA_H */