VC-1 Tables

(Part of Understanding VC-1)

Motion Vector Range VLC Table

code length   VLC    range #
    1          0        0
    2          2        1
    3          6        2
    3          7        3

Transform Tables

These tables pertain to vc1ITRANS_InverseTransform_AnnexA1.

Transform Matrix 8x8

 int transform_matrix_8x8[8][8] = 
 {
   {  12,  12,  12,  12,  12,  12,  12,  12 },
   {  16,  15,   9,   4,  -4,  -9, -15, -16 },
   {  16,   6,  -6, -16, -16,  -6,   6,  16 },
   {  15,  -4, -16,  -9,   9,  16,   4, -15 },
   {  12, -12, -12,  12,  12, -12, -12,  12 },
   {   9, -16,   4,  15, -15,  -4,  16,  -9 },
   {   6, -16,  16,  -6,  -6,  16, -16,   6 },
   {   4,  -9,  15, -16,  16, -15,   9,  -4 }
 };

Transform Matrix 4x4

 int transform_matrix_4x4[4][4] = 
 {
   {  17,  17,  17,  17 },
   {  22,  10, -10, -22 },
   {  17, -17, -17,  17 },
   {  10, -22,  22, -10 }
 };

Constants 8

 int constants_8 = { 0,   0,   0,   0,   1,   1,   1,   1 };

Constants 4

 int constants_4 = { 0,   0,   0,   0 };

Bicubic Filter Coefficients

• 1/4 pel coordinate: {-4, 53, 18, -3}, divisor = 64 = 2⁶
• 1/2 pel coordinate: {-1, 9, 9, -1}, divisor = 16 = 2⁴
• 3/4 pel coordinate: {-3, 18, 53, -4}, divisor = 64 = 2⁶

Bilinear Filter Coefficients

• array a: {4, 3, 2, 1}
• array b: {0, 1, 2, 3}

Macroblock Transform Type VLC Tables

1 <= PQuant <= 4

{0, 16, 12},

   {0, 2, vc1_SBP8x4Both},         {3, 2, vc1_SBP8x8},
   {1, 2, vc1_SBP4x8Both},         {4, 3, vc1_SBP4x4},
   {22, 5, vc1_SBP4x8Right},       {21, 5, vc1_SBP4x8Left},
   {20, 5, vc1_SBP8x8MB},          {46, 6, vc1_SBP8x4Bottom},     
   {95, 7, vc1_SBP8x4Top},         {377, 9, vc1_SBP8x4TopMB},
   {379, 9, vc1_SBP8x4BothMB},     {378, 9, vc1_SBP4x4MB},
   {753, 10, vc1_SBP8x4BottomMB},  {1505, 11, vc1_SBP4x8BothMB},
   {3008, 12, vc1_SBP4x8RightMB},  {3009, 12, vc1_SBP4x8LeftMB},

I-Frame Coded Block Pattern VLC Table

SRD: vc1DEC_I_Picture_CBPCY_VLC

Implicit Non-Uniform Quantizers

SRD: vc1IQUANT_NonUniformImplicit

 unsigned char non_uniform_implicit_quantizers[32] =
 {
    0,  0,  0,  0,  0,  0,  0,  0,
    0,  6,  7,  8,  9, 10, 11, 12,
   13, 14, 15, 16, 17, 18, 19, 20,
   21, 22, 23, 24, 25, 27, 29, 31
 };

3D Huffman Tables

This SRD refers to a system of 3D Huffman decoding. The 3-dimensional table is laid out as such:

 vc1DEC3DH_pACCodingSets
   +- 0: (inter)
    +- vc1DEC3DH_HighRateInter
    +- vc1DEC3DH_HighMotInter
    +- vc1DEC3DH_MidRateInter
   +- 1: (inter)
    +- vc1DEC3DH_LowMotInter
    +- vc1DEC3DH_HighMotInter
    +- vc1DEC3DH_MidRateInter
   +- 2: (intra)
    +- vc1DEC3DH_HighRateIntra
    +- vc1DEC3DH_HighMotIntra
    +- vc1DEC3DH_MidRateIntra
   +- 3: (intra)
    +- vc1DEC3DH_LowMotIntra
    +- vc1DEC3DH_HighMotIntra
    +- vc1DEC3DH_MidRateIntra

Thus, there are 8 AC coding sets used in 12 positions:

Intraframe Coding Sets

vc1DEC3DH_LowMotIntra

• vc1DEC_Low_Mot_Intra_VLC
• vc1DEC_Low_Mot_Intra_Run_Level
• vc1_Low_Mot_Intra_Delta_Level_0
• vc1_Low_Mot_Intra_Delta_Run_0
• vc1_Low_Mot_Intra_Delta_Level_1
• vc1_Low_Mot_Intra_Delta_Run_1

vc1DEC3DH_MidRateIntra

• vc1DEC_Mid_Rate_Intra_VLC
• vc1DEC_Mid_Rate_Intra_Run_Level
• vc1_Mid_Rate_Intra_Delta_Level_0
• vc1_Mid_Rate_Intra_Delta_Run_0
• vc1_Mid_Rate_Intra_Delta_Level_1
• vc1_Mid_Rate_Intra_Delta_Run_1

vc1DEC3DH_HighMotIntra

• vc1DEC_High_Mot_Intra_VLC
• vc1DEC_High_Mot_Intra_Run_Level
• vc1_High_Mot_Intra_Delta_Level_0
• vc1_High_Mot_Intra_Delta_Run_0
• vc1_High_Mot_Intra_Delta_Level_1
• vc1_High_Mot_Intra_Delta_Run_1

vc1DEC3DH_HighRateIntra

• vc1DEC_High_Rate_Intra_VLC
• vc1DEC_High_Rate_Intra_Run_Level
• vc1_High_Rate_Intra_Delta_Level_0
• vc1_High_Rate_Intra_Delta_Run_0
• vc1_High_Rate_Intra_Delta_Level_1
• vc1_High_Rate_Intra_Delta_Run_1

Interframe Coding Sets

vc1DEC3DH_LowMotInter

• vc1DEC_Low_Mot_Inter_VLC
• vc1DEC_Low_Mot_Inter_Run_Level
• vc1_Low_Mot_Inter_Delta_Level_0
• vc1_Low_Mot_Inter_Delta_Run_0
• vc1_Low_Mot_Inter_Delta_Level_1
• vc1_Low_Mot_Inter_Delta_Run_1

vc1DEC3DH_MidRateInter

• vc1DEC_Mid_Rate_Inter_VLC
• vc1DEC_Mid_Rate_Inter_Run_Level
• vc1_Mid_Rate_Inter_Delta_Level_0
• vc1_Mid_Rate_Inter_Delta_Run_0
• vc1_Mid_Rate_Inter_Delta_Level_1
• vc1_Mid_Rate_Inter_Delta_Run_1

vc1DEC3DH_HighMotInter

• vc1DEC_High_Mot_Inter_VLC
• vc1DEC_High_Mot_Inter_Run_Level
• vc1_High_Mot_Inter_Delta_Level_0
• vc1_High_Mot_Inter_Delta_Run_0
• vc1_High_Mot_Inter_Delta_Level_1
• vc1_High_Mot_Inter_Delta_Run_1

vc1DEC3DH_HighRateInter

• vc1DEC_High_Rate_Inter_VLC
• vc1DEC_High_Rate_Inter_Run_Level
• vc1_High_Rate_Inter_Delta_Level_0
• vc1_High_Rate_Inter_Delta_Run_0
• vc1_High_Rate_Inter_Delta_Level_1
• vc1_High_Rate_Inter_Delta_Run_1

Block Escape Mode VLC Tables

1 <= PQuant <= 7

{0, 11, 5},
{1, 3, 1},
{2, 3, 2},
{3, 3, 3},
{4, 3, 4},
{5, 3, 5},
{6, 3, 6},
{7, 3, 7},
{0, 5, 8},
{1, 5, 9},
{2, 5, 10},
{3, 5, 11}

8 <= PQuant <= 31

{0, 7, 6}, 
{1, 1, 2},
{1, 2, 3},
{1, 3, 4},
{1, 4, 5},
{1, 5, 6},
{1, 6, 7},
{0, 6, 8}

Level Limits

This table defines the level limits at all various profile/level combinations. The types of parameters limited in this table are defined in the level limits data structure.