// Main code function
void PredModeCodec::DoWorkCode( MvData& in_data )
{
int step,max;
int split_depth;
for (m_sb_yp = 0, m_sb_tlb_y = 0; m_sb_yp < in_data.SBSplit().LengthY(); ++m_sb_yp, m_sb_tlb_y += 4)
{
for (m_sb_xp = 0,m_sb_tlb_x = 0; m_sb_xp < in_data.SBSplit().LengthX(); ++m_sb_xp,m_sb_tlb_x += 4)
{
split_depth = in_data.SBSplit()[m_sb_yp][m_sb_xp];
step = 4 >> (split_depth);
max = (1 << split_depth);
//now do all the block modes and mvs in the mb
for (m_b_yp = m_sb_tlb_y; m_b_yp < m_sb_tlb_y+4; m_b_yp += step)
{
for (m_b_xp = m_sb_tlb_x; m_b_xp < m_sb_tlb_x+4; m_b_xp += step)
{
CodeVal(in_data);
}//m_b_xp
}//m_b_yp
}//m_sb_xp
}//m_sb_yp
}
void SplitModeCodec::CodeVal(const MvData& in_data)
{
int val = in_data.SBSplit()[m_sb_yp][m_sb_xp] - Prediction( in_data.SBSplit() );
if (val < 0) val+=3; //produce prediction mod 3
EncodeUInt(val, SB_SPLIT_BIN1_CTX, SB_SPLIT_BIN2_CTX);
}
// Main code function
void SplitModeCodec::DoWorkCode( MvData& in_data )
{
for (m_sb_yp = 0; m_sb_yp < in_data.SBSplit().LengthY(); ++m_sb_yp)
{
for (m_sb_xp = 0; m_sb_xp < in_data.SBSplit().LengthX(); ++m_sb_xp)
{
CodeVal(in_data);
}//m_sb_xp
}//m_sb_yp
}
// Main decode function
void SplitModeCodec::DoWorkDecode( MvData& out_data)
{
for (m_sb_yp = 0; m_sb_yp < out_data.SBSplit().LengthY(); ++m_sb_yp)
{
for (m_sb_xp = 0; m_sb_xp < out_data.SBSplit().LengthX(); ++m_sb_xp)
{
DecodeVal( out_data );
}//m_sb_xp
}//m_sb_yp
}
// Main decode function
void PredModeCodec::DoWorkDecode( MvData& out_data)
{
int step,max;
int split_depth;
int xstart,ystart;
// Then the prediction mode
for (m_sb_yp = 0,m_sb_tlb_y = 0; m_sb_yp < out_data.SBSplit().LengthY(); ++m_sb_yp,m_sb_tlb_y += 4)
{
for (m_sb_xp = 0,m_sb_tlb_x = 0; m_sb_xp < out_data.SBSplit().LengthX(); ++m_sb_xp,m_sb_tlb_x += 4)
{
split_depth = out_data.SBSplit()[m_sb_yp][m_sb_xp];
step = 4 >> (split_depth);
max = (1 << split_depth);
//now do all the block mvs in the mb
for (int j = 0; j < max; ++j)
{
for (int i = 0; i < max; ++i)
{
xstart = m_b_xp = m_sb_tlb_x + i * step;
ystart = m_b_yp = m_sb_tlb_y + j * step;
DecodeVal(out_data);
// propagate throughout SB
for (m_b_yp = ystart; m_b_yp < ystart+step; m_b_yp++)
{
for (m_b_xp = xstart; m_b_xp < xstart+step; m_b_xp++)
{
out_data.Mode()[m_b_yp][m_b_xp] = out_data.Mode()[ystart][xstart];
}//m_b_xp
}//m_b_yp
}//i
}//j
}//m_sb_xp
}//m_sb_yp
}
void MotionCompensator::CompensateComponent( Picture* pic ,
Picture* refsptr[2] ,
const MvData& mv_data ,
const CompSort cs )
{
// Set up references to pictures and references
PicArray& pic_data_out = pic->Data( cs );
// Size of picture component being motion compensated
const PicArray& ref1up = refsptr[0]->UpData( cs );
const PicArray& ref2up = refsptr[1]->UpData( cs );
// Set up a row of blocks which will contain the MC data, which
// we'll add or subtract to pic_data_out
TwoDArray<ValueType> pic_data(m_bparams.Yblen(), pic_data_out.LengthX(), 0 );
// Factors to compensate for subsampling of chroma
int xscale_shift = 0;
int yscale_shift = 0;
if ( cs != Y_COMP )
{
if (m_cformat == format420)
{
xscale_shift = 1;
yscale_shift = 1;
}
else if (m_cformat == format422)
{
xscale_shift = 1;
yscale_shift = 0;
}
}
ImageCoords pic_size(pic->GetPparams().Xl(), pic->GetPparams().Yl());
if ( cs != Y_COMP )
{
pic_size.x = pic->GetPparams().ChromaXl();
pic_size.y = pic->GetPparams().ChromaYl();
}
// Reference to the relevant DC array
const TwoDArray<ValueType>& dcarray = mv_data.DC( cs );
// Set up references to the vectors
const int num_refs = pic->GetPparams().Refs().size();
const MvArray* mv_array1;
const MvArray* mv_array2;
mv_array1 = &mv_data.Vectors(1);
if (num_refs ==2 )
mv_array2 = &mv_data.Vectors(2);
else
mv_array2 = &mv_data.Vectors(1);
ReConfig();//set all the weighting blocks up
//Blocks are listed left to right, line by line.
MVector mv1,mv2;
PredMode block_mode;
//Coords of the top-left corner of a block
ImageCoords pos;
//Loop for each block in the output image.
//The CompensateBlock function will use the image pointed to by ref1up
//and add the compensated pixels to the image pointed to by pic_data.
size_t wgt_idx;
int save_from_row = m_bparams.Ybsep()-m_bparams.Yoffset();
// unpadded picture dimensions
const int x_end_data = pic_data_out.FirstX() + std::min(pic_data_out.LengthX(), pic_size.x );
const int y_end_data = pic_data_out.FirstY() + std::min(pic_data_out.LengthY(), pic_size.y );
const int blocks_per_mb_row = m_predparams.XNumBlocks()/m_predparams.XNumSB();
const int blocks_per_sb_row = blocks_per_mb_row>>1;
// The picture does not contain integral number of blocks. So not all
// blocks need to be processed. Compute the relevant blocks to be
// processed
int y_num_blocks = std::min((NUM_USED_BLKS(pic_size.y,m_bparams.Ybsep(),m_bparams.Yblen())),
m_predparams.YNumBlocks());
int x_num_blocks = std::min((NUM_USED_BLKS(pic_size.x,m_bparams.Xbsep(),m_bparams.Xblen())),
m_predparams.XNumBlocks());
//Loop over all the block rows
pos.y = -m_bparams.Yoffset();
for(int yblock = 0; yblock < y_num_blocks; ++yblock)
{
pos.x = -m_bparams.Xoffset();
int xincr, xb_incr = 0;
//loop over all the blocks in a row
for(int xblock = 0 ; xblock < x_num_blocks; xblock+=xb_incr)
{
int split_mode = mv_data.SBSplit()[yblock/blocks_per_mb_row][xblock/blocks_per_mb_row];
int blk_x, blk_y = 1;
switch (split_mode)
{
case 0: // processing superblock
blk_x = blocks_per_mb_row;
break;
case 1: // processing sub-superblock
blk_x = blocks_per_sb_row;
break;
case 2: // processing block
default:
blk_x = 1;
break;
}
//Decide which weights to use.
if (pos.x >=0 && (xblock+blk_x) < x_num_blocks)
{
// block is entirely within picture in x direction
if (pos.y < 0)
wgt_idx = 1;
else if ((yblock+blk_y) < y_num_blocks)
wgt_idx = 4;
else
wgt_idx = 7;
}
else if (pos.x < 0)
{
// left edge of block is outside picture in x direction
if (pos.y < 0)
wgt_idx = 0;
else if ((yblock+blk_y) < y_num_blocks)
wgt_idx = 3;
else
wgt_idx = 6;
}
else
{
// right edge of block is outside picture in x direction
if (pos.y < 0)
wgt_idx = 2;
else if ((yblock+blk_y) < y_num_blocks)
wgt_idx = 5;
else
wgt_idx = 8;
}
block_mode = mv_data.Mode()[yblock][xblock];
TwoDArray<ValueType> *wt;
if (split_mode == 0) //Block part of a MacroBlock
{
wt = &m_macro_block_weights[wgt_idx];
xb_incr = blocks_per_mb_row;
}
else if (split_mode == 1) //Block part of a SubBlock
{
wt = &m_sub_block_weights[wgt_idx];
xb_incr = blocks_per_sb_row;
}
else
{
wt = &m_block_weights[wgt_idx];
xb_incr = 1;
}
xincr = m_bparams.Xbsep() * xb_incr;
mv1 = (*mv_array1)[yblock][xblock];
mv1.x >>= xscale_shift;
mv1.y >>= yscale_shift;
mv2 = (*mv_array2)[yblock][xblock];
mv2.x >>= xscale_shift;
mv2.y >>= yscale_shift;
CompensateBlock(pic_data, pos, pic_size, block_mode, dcarray[yblock][xblock], ref1up, mv1, ref2up, mv2, *wt);
//Increment the block horizontal position
pos.x += xincr;
}//xblock
// Update the pic data
// Use only the first Ybsep rows since the remaining rows are
// needed for the next row of blocks since we are using overlapped
// blocks motion compensation
if (m_add_or_sub == SUBTRACT)
{
int start_y = std::max(pic_data_out.FirstY() , pos.y) ;
int end_y = std::min (pic_data_out.FirstY() + pos.y + m_bparams.Ybsep() , y_end_data);
if (yblock == y_num_blocks - 1)
{
end_y = pic_data_out.LengthY();
if (end_y > y_end_data)
end_y = y_end_data;
}
for ( int i = start_y, pos_y = 0; i < end_y; i++, pos_y++)
{
ValueType *pic_row = pic_data[pos_y];
ValueType *out_row = pic_data_out[i];
for ( int j =pic_data_out.FirstX(); j < x_end_data; ++j)
{
out_row[j] -= static_cast<ValueType>( (pic_row[j] + 32) >> 6 );
}
// Okay, we've done all the actual blocks. Now if the picture is further padded
// we need to set the padded values to zero beyond the last block in the row,
// for all the picture lines in the block row. Need only do this when we're
// subtracting.
for (int j=pic_size.x; j<pic_data_out.LengthX() ; ++j )
{
out_row[pic_data_out.FirstX()+j] = 0;
}
}
}
else // (m_add_or_sub == ADD)
{
void SplitModeCodec::DecodeVal(MvData& out_data)
{
out_data.SBSplit()[m_sb_yp][m_sb_xp] =
(DecodeUInt(SB_SPLIT_BIN1_CTX, SB_SPLIT_BIN2_CTX) +
Prediction(out_data.SBSplit())) % 3;
}
