vc1data.c

ffmpeg的完整源代码和作者自己写的文档。不但有在Linux的工程哦

/*
 * VC-1 and WMV3 decoder
 * copyright (c) 2006 Konstantin Shishkov
 * (c) 2005 anonymous, Alex Beregszaszi, Michael Niedermayer
 *
 * 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 vc1data.c
 * VC-1 tables.
 */

#include "avcodec.h"
#include "vc1.h"
#include "vc1data.h"

/** Table for conversion between TTBLK and TTMB */
const int ff_vc1_ttblk_to_tt[3][8] = {
  { TT_8X4, TT_4X8, TT_8X8, TT_4X4, TT_8X4_TOP, TT_8X4_BOTTOM, TT_4X8_RIGHT, TT_4X8_LEFT },
  { TT_8X8, TT_4X8_RIGHT, TT_4X8_LEFT, TT_4X4, TT_8X4, TT_4X8, TT_8X4_BOTTOM, TT_8X4_TOP },
  { TT_8X8, TT_4X8, TT_4X4, TT_8X4_BOTTOM, TT_4X8_RIGHT, TT_4X8_LEFT, TT_8X4, TT_8X4_TOP }
};

const int ff_vc1_ttfrm_to_tt[4] = { TT_8X8, TT_8X4, TT_4X8, TT_4X4 };

/** MV P mode - the 5th element is only used for mode 1 */
const uint8_t ff_vc1_mv_pmode_table[2][5] = {
  { MV_PMODE_1MV_HPEL_BILIN, MV_PMODE_1MV, MV_PMODE_1MV_HPEL, MV_PMODE_INTENSITY_COMP, MV_PMODE_MIXED_MV },
  { MV_PMODE_1MV, MV_PMODE_MIXED_MV, MV_PMODE_1MV_HPEL, MV_PMODE_INTENSITY_COMP, MV_PMODE_1MV_HPEL_BILIN }
};
const uint8_t ff_vc1_mv_pmode_table2[2][4] = {
  { MV_PMODE_1MV_HPEL_BILIN, MV_PMODE_1MV, MV_PMODE_1MV_HPEL, MV_PMODE_MIXED_MV },
  { MV_PMODE_1MV, MV_PMODE_MIXED_MV, MV_PMODE_1MV_HPEL, MV_PMODE_1MV_HPEL_BILIN }
};

const int ff_vc1_fps_nr[5] = { 24, 25, 30, 50, 60 },
  ff_vc1_fps_dr[2] = { 1000, 1001 };
const uint8_t ff_vc1_pquant_table[3][32] = {
  {  /* Implicit quantizer */
     0,  1,  2,  3,  4,  5,  6,  7,  8,  6,  7,  8,  9, 10, 11, 12,
    13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 29, 31
  },
  {  /* Explicit quantizer, pquantizer uniform */
     0,  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, 29, 30, 31
  },
  {  /* Explicit quantizer, pquantizer non-uniform */
     0,  1,  1,  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, 29, 31
  }
};

/** @name VC-1 VLC tables and defines
 *  @todo TODO move this into the context
 */
//@{
#define VC1_BFRACTION_VLC_BITS 7
VLC ff_vc1_bfraction_vlc;
#define VC1_IMODE_VLC_BITS 4
VLC ff_vc1_imode_vlc;
#define VC1_NORM2_VLC_BITS 3
VLC ff_vc1_norm2_vlc;
#define VC1_NORM6_VLC_BITS 9
VLC ff_vc1_norm6_vlc;
/* Could be optimized, one table only needs 8 bits */
#define VC1_TTMB_VLC_BITS 9 //12
VLC ff_vc1_ttmb_vlc[3];
#define VC1_MV_DIFF_VLC_BITS 9 //15
VLC ff_vc1_mv_diff_vlc[4];
#define VC1_CBPCY_P_VLC_BITS 9 //14
VLC ff_vc1_cbpcy_p_vlc[4];
#define VC1_4MV_BLOCK_PATTERN_VLC_BITS 6
VLC ff_vc1_4mv_block_pattern_vlc[4];
#define VC1_TTBLK_VLC_BITS 5
VLC ff_vc1_ttblk_vlc[3];
#define VC1_SUBBLKPAT_VLC_BITS 6
VLC ff_vc1_subblkpat_vlc[3];

VLC ff_vc1_ac_coeff_table[8];
//@}


#if B_FRACTION_DEN==840 //original bfraction from vc9data.h, not conforming to standard
/* bfraction is fractional, we scale to the GCD 3*5*7*8 = 840 */
const int16_t ff_vc1_bfraction_lut[23] = {
  420 /*1/2*/, 280 /*1/3*/, 560 /*2/3*/, 210 /*1/4*/,
  630 /*3/4*/, 168 /*1/5*/, 336 /*2/5*/,
  504 /*3/5*/, 672 /*4/5*/, 140 /*1/6*/, 700 /*5/6*/,
  120 /*1/7*/, 240 /*2/7*/, 360 /*3/7*/, 480 /*4/7*/,
  600 /*5/7*/, 720 /*6/7*/, 105 /*1/8*/, 315 /*3/8*/,
  525 /*5/8*/, 735 /*7/8*/,
  -1 /*inv.*/, 0 /*BI fm*/
};
#else
/* pre-computed scales for all bfractions and base=256 */
const int16_t ff_vc1_bfraction_lut[23] = {
  128 /*1/2*/,  85 /*1/3*/, 170 /*2/3*/,  64 /*1/4*/,
  192 /*3/4*/,  51 /*1/5*/, 102 /*2/5*/,
  153 /*3/5*/, 204 /*4/5*/,  43 /*1/6*/, 215 /*5/6*/,
   37 /*1/7*/,  74 /*2/7*/, 111 /*3/7*/, 148 /*4/7*/,
  185 /*5/7*/, 222 /*6/7*/,  32 /*1/8*/,  96 /*3/8*/,
  160 /*5/8*/, 224 /*7/8*/,
  -1 /*inv.*/, 0 /*BI fm*/
};
#endif

const uint8_t ff_vc1_bfraction_bits[23] = {
    3, 3, 3, 3,
    3, 3, 3,
    7, 7, 7, 7,
    7, 7, 7, 7,
    7, 7, 7, 7,
    7, 7,
    7, 7
};
const uint8_t ff_vc1_bfraction_codes[23] = {
     0,   1,   2,   3,
     4,   5,   6,
   112, 113, 114, 115,
   116, 117, 118, 119,
   120, 121, 122, 123,
   124, 125,
   126, 127
};

//Same as H.264
const AVRational ff_vc1_pixel_aspect[16]={
 {0, 1},
 {1, 1},
 {12, 11},
 {10, 11},
 {16, 11},
 {40, 33},
 {24, 11},
 {20, 11},
 {32, 11},
 {80, 33},
 {18, 11},
 {15, 11},
 {64, 33},
 {160, 99},
 {0, 1},
 {0, 1}
};

/* BitPlane IMODE - such a small table... */
const uint8_t ff_vc1_imode_codes[7] = {
  0, 2, 1, 3, 1, 2, 3
};
const uint8_t ff_vc1_imode_bits[7] = {
  4, 2, 3, 2, 4, 3, 3
};

/* Normal-2 imode */
const uint8_t ff_vc1_norm2_codes[4] = {
  0, 4, 5, 3
};
const uint8_t ff_vc1_norm2_bits[4] = {
  1, 3, 3, 2
};

const uint16_t ff_vc1_norm6_codes[64] = {
0x001, 0x002, 0x003, 0x000, 0x004, 0x001, 0x002, 0x047, 0x005, 0x003, 0x004, 0x04B, 0x005, 0x04D, 0x04E, 0x30E,
0x006, 0x006, 0x007, 0x053, 0x008, 0x055, 0x056, 0x30D, 0x009, 0x059, 0x05A, 0x30C, 0x05C, 0x30B, 0x30A, 0x037,
0x007, 0x00A, 0x00B, 0x043, 0x00C, 0x045, 0x046, 0x309, 0x00D, 0x049, 0x04A, 0x308, 0x04C, 0x307, 0x306, 0x036,
0x00E, 0x051, 0x052, 0x305, 0x054, 0x304, 0x303, 0x035, 0x058, 0x302, 0x301, 0x034, 0x300, 0x033, 0x032, 0x007,
};

const uint8_t ff_vc1_norm6_bits[64] = {
 1,  4,  4,  8,  4,  8,  8, 10,  4,  8,  8, 10,  8, 10, 10, 13,
 4,  8,  8, 10,  8, 10, 10, 13,  8, 10, 10, 13, 10, 13, 13,  9,
 4,  8,  8, 10,  8, 10, 10, 13,  8, 10, 10, 13, 10, 13, 13,  9,
 8, 10, 10, 13, 10, 13, 13,  9, 10, 13, 13,  9, 13,  9,  9,  6,
};
/* Normal-6 imode */
const uint8_t ff_vc1_norm6_spec[64][5] = {
{ 0,  1, 1        },
{ 1,  2, 4        },
{ 2,  3, 4        },
{ 3,  0, 8        },
{ 4,  4, 4        },
{ 5,  1, 8        },
{ 6,  2, 8        },
{ 7,  2, 5,  7, 5 },
{ 8,  5, 4        },
{ 9,  3, 8        },
{10,  4, 8        },
{11,  2, 5, 11, 5 },
{12,  5, 8        },
{13,  2, 5, 13, 5 },
{14,  2, 5, 14, 5 },
{15,  3, 5, 14, 8 },
{16,  6, 4        },
{17,  6, 8        },
{18,  7, 8        },
{19,  2, 5, 19, 5 },
{20,  8, 8        },
{21,  2, 5, 21, 5 },
{22,  2, 5, 22, 5 },
{23,  3, 5, 13, 8 },
{24,  9, 8        },
{25,  2, 5, 25, 5 },
{26,  2, 5, 26, 5 },
{27,  3, 5, 12, 8 },
{28,  2, 5, 28, 5 },
{29,  3, 5, 11, 8 },
{30,  3, 5, 10, 8 },
{31,  3, 5,  7, 4 },
{32,  7, 4        },
{33, 10, 8        },
{34, 11, 8        },
{35,  2, 5,  3, 5 },
{36, 12, 8        },
{37,  2, 5,  5, 5 },
{38,  2, 5,  6, 5 },
{39,  3, 5,  9, 8 },
{40, 13, 8        },
{41,  2, 5,  9, 5 },
{42,  2, 5, 10, 5 },
{43,  3, 5,  8, 8 },
{44,  2, 5, 12, 5 },
{45,  3, 5,  7, 8 },
{46,  3, 5,  6, 8 },
{47,  3, 5,  6, 4 },
{48, 14, 8        },
{49,  2, 5, 17, 5 },
{50,  2, 5, 18, 5 },
{51,  3, 5,  5, 8 },
{52,  2, 5, 20, 5 },
{53,  3, 5,  4, 8 },
{54,  3, 5,  3, 8 },
{55,  3, 5,  5, 4 },
{56,  2, 5, 24, 5 },
{57,  3, 5,  2, 8 },
{58,  3, 5,  1, 8 },
{59,  3, 5,  4, 4 },
{60,  3, 5,  0, 8 },
{61,  3, 5,  3, 4 },
{62,  3, 5,  2, 4 },
{63,  3, 5,  1, 1 },
};

/* 4MV Block pattern VLC tables */
const uint8_t ff_vc1_4mv_block_pattern_codes[4][16] = {
  { 14, 58, 59, 25, 12, 26, 15, 15, 13, 24, 27,  0, 28,  1,  2,  2},
  {  8, 18, 19,  4, 20,  5, 30, 11, 21, 31,  6, 12,  7, 13, 14,  0},
  { 15,  6,  7,  2,  8,  3, 28,  9, 10, 29,  4, 11,  5, 12, 13,  0},
  {  0, 11, 12,  4, 13,  5, 30, 16, 14, 31,  6, 17,  7, 18, 19, 10}
};
const uint8_t ff_vc1_4mv_block_pattern_bits[4][16] = {
  { 5, 6, 6, 5, 5, 5, 5, 4, 5, 5, 5, 3, 5, 3, 3, 2},
  { 4, 5, 5, 4, 5, 4, 5, 4, 5, 5, 4, 4, 4, 4, 4, 2},
  { 4, 4, 4, 4, 4, 4, 5, 4, 4, 5, 4, 4, 4, 4, 4, 3},
  { 2, 4, 4, 4, 4, 4, 5, 5, 4, 5, 4, 5, 4, 5, 5, 4}
};

const uint8_t wmv3_dc_scale_table[32]={
    0, 2, 4, 8, 8, 8, 9, 9,10,10,11,11,12,12,13,13,14,14,15,15,16,16,17,17,18,18,19,19,20,20,21,21
};

/* P-Picture CBPCY VLC tables */
#if 1 // Looks like original tables are not conforming to standard at all. Are they used for old WMV?
const uint16_t ff_vc1_cbpcy_p_codes[4][64] = {
  {
      0,   6,  15,  13,  13,  11,   3,  13,   5,   8,  49,  10,  12, 114, 102, 119,
      1,  54,  96,   8,  10, 111,   5,  15,  12,  10,   2,  12,  13, 115,  53,  63,
      1,   7,   1,   7,  14,  12,   4,  14,   1,   9,  97,  11,   7,  58,  52,  62,
      4, 103,   1,   9,  11,  56, 101, 118,   4, 110, 100,  30,   2,   5,   4,   3
  },
  {
      0,   9,   1,  18,   5,  14, 237,  26,   3, 121,   3,  22,  13,  16,   6,  30,
      2,  10,   1,  20,  12, 241,   5,  28,  16,  12,   3,  24,  28, 124, 239, 247,
      1, 240,   1,  19,  18,  15,   4,  27,   1, 122,   2,  23,   1,  17,   7,  31,
      1,  11,   2,  21,  19, 246, 238,  29,  17,  13, 236,  25,  58,  63,   8, 125
  },
  {
      0, 201,  25, 231,   5, 221,   1,   3,   2, 414,   2, 241,  16, 225, 195, 492,
      2, 412,   1, 240,   7, 224,  98, 245,   1, 220,  96,   5,   9, 230, 101, 247,
      1, 102,   1, 415,  24,   3,   2, 244,   3,  54,   3, 484,  17, 114, 200, 493,
      3, 413,   1,   4,  13, 113,  99, 485,   4, 111, 194, 243,   5,  29,  26,  31
  },
  {
      0,  28,  12,  44,   3,  36,  20,  52,   2,  32,  16,  48,   8,  40,  24,  28,
      1,  30,  14,  46,   6,  38,  22,  54,   3,  34,  18,  50,  10,  42,  26,  30,
      1,  29,  13,  45,   5,  37,  21,  53,   2,  33,  17,  49,   9,  41,  25,  29,
      1,  31,  15,  47,   7,  39,  23,  55,   4,  35,  19,  51,  11,  43,  27,  31
   }
};

const uint8_t ff_vc1_cbpcy_p_bits[4][64] = {
  {
    13,  13,   7,  13,   7,  13,  13,  12,   6,  13,   7,  12,   6,   8,   8,   8,
     5,   7,   8,  12,   6,   8,  13,  12,   7,  13,  13,  12,   6,   8,   7,   7,
     6,  13,   8,  12,   7,  13,  13,  12,   7,  13,   8,  12,   5,   7,   7,   7,
     6,   8,  13,  12,   6,   7,   8,   8,   5,   8,   8,   6,   3,   3,   3,   2
  },
  {
    14,  13,   8,  13,   3,  13,   8,  13,   3,   7,   8,  13,   4,  13,  13,  13,
     3,  13,  13,  13,   4,   8,  13,  13,   5,  13,  13,  13,   5,   7,   8,   8,
     3,   8,  14,  13,   5,  13,  13,  13,   4,   7,  13,  13,   6,  13,  13,  13,
     5,  13,   8,  13,   5,   8,   8,  13,   5,  13,   8,  13,   6,   6,  13,   7
  },
  {
    13,   8,   6,   8,   4,   8,  13,  12,   4,   9,   8,   8,   5,   8,   8,   9,
     5,   9,  10,   8,   4,   8,   7,   8,   6,   8,   7,  13,   4,   8,   7,   8,
     5,   7,   8,   9,   6,  13,  13,   8,   4,   6,   8,   9,   5,   7,   8,   9,
     5,   9,   9,  13,   5,   7,   7,   9,   4,   7,   8,   8,   3,   5,   5,   5
  },
  {
     9,   9,   9,   9,   2,   9,   9,   9,   2,   9,   9,   9,   9,   9,   9,   8,
     3,   9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   8,
     2,   9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   8,
     9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   9,   8
  }
};
#else
const uint16_t ff_vc1_cbpcy_p_codes[4][64] = {
  {
      0,   1,   1,   4,   5,   1,  12,   4,  13,  14,  10,  11,  12,   7,  13,   2,
     15,   1,  96,   1,  49,  97,   2, 100,   3,   4,   5, 101, 102,  52,  53,   4,
      6,   7,  54, 103,   8,   9,  10, 110,  11,  12, 111,  56, 114,  58, 115,   5,
     13,   7,   8,   9,  10,  11,  12,  30,  13,  14,  15, 118, 119,  62,  63,   3
  },
  {
      0,   1,   2,   1,   3,   1,  16,  17,   5,  18,  12,  19,  13,   1,  28,  58,
      1,   1,   1,   2,   3,   2,   3, 236, 237,   4,   5, 238,   6,   7, 239,   8,
      9, 240,  10,  11, 121, 122,  12,  13,  14,  15, 241, 246,  16,  17, 124,  63,
     18,  19,  20,  21,  22,  23,  24,  25,  26,  27,  28,  29,  30,  31, 247, 125
  },
  {
      0,   1,   2,   3,   2,   3,   1,   4,   5,  24,   7,  13,  16,  17,   9,   5,
     25,   1,   1,   1,   2,   3,  96, 194,   1,   2,  98,  99, 195, 200, 101,  26,
    201, 102, 412, 413, 414,  54, 220, 111, 221,   3, 224, 113, 225, 114, 230,  29,
    231, 415, 240,   4, 241, 484,   5, 243,   3, 244, 245, 485, 492, 493, 247,  31
  },
  {
      0,   1,   1,   1,   2,   2,   3,   4,   3,   5,   6,   7,   8,   9,  10,  11,
     12,  13,  14,  15,  16,  17,  18,  19,  20,  21,  22,  23,  24,  25,  26,  27,
     28,  29,  30,  31,  32,  33,  34,  35,  36,  37,  38,  39,  40,  41,  42,  43,
     44,  45,  46,  47,  48,  49,  50,  51,  52,  53,  54,  55,  28,  29,  30,  31
   }
};