📄 macroblock.c
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dP = &(currSlice->partArr[partMap[SE_REFFRAME]]);
if (active_pps->entropy_coding_mode_flag == UVLC || dP->bitstream->ei_flag) currSE.mapping = linfo_ue;
else currSE.reading = readRefFrame_CABAC;
for (j0=0; j0<4; j0+=step_v0)
{
for (i0=0; i0<4; i0+=step_h0)
{
k=2*(j0/2)+(i0/2);
if ((currMB->b8pdir[k]==0 || currMB->b8pdir[k]==2) && currMB->b8mode[k]!=0)
{
TRACE_STRING("ref_idx_l0");
img->subblock_x = i0;
img->subblock_y = j0;
if (!IS_P8x8 (currMB) || bframe || (!bframe && !img->allrefzero))
{
currSE.context = BType2CtxRef (currMB->b8mode[k]);
if( (active_pps->entropy_coding_mode_flag == UVLC || dP->bitstream->ei_flag) && flag_mode )
{
currSE.len = 1;
readSyntaxElement_FLC(&currSE, dP->bitstream);
currSE.value1 = 1 - currSE.value1;
}
else
{
currSE.value2 = LIST_0;
dP->readSyntaxElement (&currSE,img,inp,dP);
}
refframe = currSE.value1;
}
else
{
refframe = 0;
}
/*
if (bframe && refframe>img->buf_cycle) // img->buf_cycle should be correct for field MBs now
{
set_ec_flag(SE_REFFRAME);
refframe = 1;
}
*/
for (j=j0; j<j0+step_v0;j++)
for (i=i0; i<i0+step_h0;i++)
{
dec_picture->ref_idx[LIST_0][img->block_x + i][img->block_y + j] = refframe;
}
}
}
}
}
else
{
for (j0=0; j0<4; j0+=step_v0)
{
for (i0=0; i0<4; i0+=step_h0)
{
k=2*(j0/2)+(i0/2);
if ((currMB->b8pdir[k]==0 || currMB->b8pdir[k]==2) && currMB->b8mode[k]!=0)
{
for (j=j0; j<j0+step_v0;j++)
for (i=i0; i<i0+step_h0;i++)
{
dec_picture->ref_idx[LIST_0][img->block_x + i][img->block_y + j] = 0;
}
}
}
}
}
// If backward multiple ref. frames, read backward reference frame for the MB *********************************
if(img->num_ref_idx_l1_active>1)
{
flag_mode = ( img->num_ref_idx_l1_active == 2 ? 1 : 0);
currSE.type = SE_REFFRAME;
dP = &(currSlice->partArr[partMap[SE_REFFRAME]]);
if (active_pps->entropy_coding_mode_flag == UVLC || dP->bitstream->ei_flag) currSE.mapping = linfo_ue;
else currSE.reading = readRefFrame_CABAC;
for (j0=0; j0<4; j0+=step_v0)
{
for (i0=0; i0<4; i0+=step_h0)
{
k=2*(j0/2)+(i0/2);
if ((currMB->b8pdir[k]==1 || currMB->b8pdir[k]==2) && currMB->b8mode[k]!=0)
{
TRACE_STRING("ref_idx_l1");
img->subblock_x = i0;
img->subblock_y = j0;
currSE.context = BType2CtxRef (currMB->b8mode[k]);
if( (active_pps->entropy_coding_mode_flag == UVLC || dP->bitstream->ei_flag) && flag_mode )
{
currSE.len = 1;
readSyntaxElement_FLC(&currSE, dP->bitstream);
currSE.value1 = 1-currSE.value1;
}
else
{
currSE.value2 = LIST_1;
dP->readSyntaxElement (&currSE,img,inp,dP);
}
refframe = currSE.value1;
for (j=j0; j<j0+step_v0;j++)
{
for (i=i0; i<i0+step_h0;i++)
{
dec_picture->ref_idx[LIST_1][img->block_x + i][img->block_y + j] = refframe;
}
}
}
}
}
}
else
{
for (j0=0; j0<4; j0+=step_v0)
{
for (i0=0; i0<4; i0+=step_h0)
{
k=2*(j0/2)+(i0/2);
if ((currMB->b8pdir[k]==1 || currMB->b8pdir[k]==2) && currMB->b8mode[k]!=0)
{
for (j=j0; j<j0+step_v0;j++)
for (i=i0; i<i0+step_h0;i++)
{
dec_picture->ref_idx[LIST_1][img->block_x + i][img->block_y + j] = 0;
}
}
}
}
}
//===== READ FORWARD MOTION VECTORS =====
currSE.type = SE_MVD;
dP = &(currSlice->partArr[partMap[SE_MVD]]);
if (active_pps->entropy_coding_mode_flag == UVLC || dP->bitstream->ei_flag) currSE.mapping = linfo_se;
else currSE.reading = readMVD_CABAC;
for (j0=0; j0<4; j0+=step_v0)
for (i0=0; i0<4; i0+=step_h0)
{
k=2*(j0/2)+(i0/2);
if ((currMB->b8pdir[k]==0 || currMB->b8pdir[k]==2) && (currMB->b8mode[k] !=0))//has forward vector
{
mv_mode = currMB->b8mode[k];
step_h = BLOCK_STEP [mv_mode][0];
step_v = BLOCK_STEP [mv_mode][1];
refframe = dec_picture->ref_idx[LIST_0][img->block_x+i0][img->block_y+j0];
for (j=j0; j<j0+step_v0; j+=step_v)
{
for (i=i0; i<i0+step_h0; i+=step_h)
{
j4 = img->block_y+j;
i4 = img->block_x+i;
// first make mv-prediction
SetMotionVectorPredictor (img, pmv, pmv+1, refframe, LIST_0, dec_picture->ref_idx, dec_picture->mv, i, j, 4*step_h, 4*step_v);
for (k=0; k < 2; k++)
{
TRACE_STRING("mvd_l0");
img->subblock_x = i; // position used for context determination
img->subblock_y = j; // position used for context determination
currSE.value2 = k<<1; // identifies the component; only used for context determination
dP->readSyntaxElement(&currSE,img,inp,dP);
curr_mvd = currSE.value1;
vec=curr_mvd+pmv[k]; /* find motion vector */
for(ii=0;ii<step_h;ii++)
{
for(jj=0;jj<step_v;jj++)
{
dec_picture->mv [LIST_0][i4+ii][j4+jj][k] = vec;
currMB->mvd [LIST_0][j+jj] [i+ii] [k] = curr_mvd;
}
}
}
}
}
}
else if (currMB->b8mode[k=2*(j0/2)+(i0/2)]==0)
{
if (!img->direct_type)
{
int list_offset = ((img->MbaffFrameFlag)&&(currMB->mb_field))? img->current_mb_nr%2 ? 4 : 2 : 0;
int imgblock_y= ((img->MbaffFrameFlag)&&(currMB->mb_field))? (img->current_mb_nr%2) ? (img->block_y-4)/2:img->block_y/2 : img->block_y;
int refList = (listX[LIST_1 + list_offset][0]->ref_idx[LIST_0][img->block_x+i0][imgblock_y+j0]== -1 ? LIST_1 : LIST_0);
int ref_idx;
ref_idx= listX[LIST_1 + list_offset][0]->ref_idx[refList][img->block_x+i0][imgblock_y+j0];
if (ref_idx==-1)
{
for (j=j0; j<j0+step_v0; j++)
for (i=i0; i<i0+step_h0; i++)
{
dec_picture->ref_idx [LIST_1][img->block_x+i][img->block_y+j]=0;
dec_picture->ref_idx [LIST_0][img->block_x+i][img->block_y+j]=0;
j4 = img->block_y+j;
i4 = img->block_x+i;
for (ii=0; ii < 2; ii++)
{
dec_picture->mv [LIST_0][i4][j4][ii]=0;
dec_picture->mv [LIST_1][i4][j4][ii]=0;
}
}
}
else
{
int mapped_idx, iref;
int j6;
if (dec_picture->ref_pic_num[LIST_0 + list_offset][ref_idx]==listX[LIST_1 + list_offset][0]->ref_pic_num[refList][ref_idx])
{
mapped_idx=ref_idx;
}
else
{
for (iref=0;iref<listXsize[refList + list_offset];iref++)
{
if (dec_picture->ref_pic_num[LIST_0 + list_offset][iref]==listX[LIST_1 + list_offset][0]->ref_pic_num[refList][ref_idx])
{
mapped_idx=iref;
break;
}
else //! invalid index. Default to zero even though this case should not happen
mapped_idx=0;
}
}
for (j=j0; j<j0+step_v0; j++)
for (i=i0; i<i0+step_h0; i++)
{
{
int prescale;
if (!img->MbaffFrameFlag || !img->mb_data[img->current_mb_nr].mb_field)
{
iTRb = Clip3( -128, 127, dec_picture->poc - listX[LIST_0 + list_offset][mapped_idx]->poc );
}
else
{
if (img->current_mb_nr%2 == 0)
iTRb = Clip3( -128, 127, dec_picture->poc - listX[LIST_0 + list_offset][mapped_idx]->poc );
else
iTRb = Clip3( -128, 127, dec_picture->poc + 1 - listX[LIST_0 + list_offset][mapped_idx]->poc );
}
iTRp = Clip3( -128, 127, listX[LIST_1 + list_offset][0]->poc - listX[LIST_0 + list_offset][mapped_idx]->poc);
if (iTRp!=0)
{
prescale = ( 16384 + abs( iTRp / 2 ) ) / iTRp;
mv_scale = Clip3( -1024, 1023, ( iTRb * prescale + 32 ) >> 6 ) ;
}
dec_picture->ref_idx [LIST_0][img->block_x+i][img->block_y+j] = mapped_idx;
dec_picture->ref_idx [LIST_1][img->block_x+i][img->block_y+j] = 0;
j4 = img->block_y+j;
j6 = imgblock_y+j;
i4 = img->block_x+i;
for (ii=0; ii < 2; ii++)
{
if (iTRp==0)
{
dec_picture->mv [LIST_0][i4][j4][ii]=listX[LIST_1 + list_offset][0]->mv[refList][i4][j6][ii];
dec_picture->mv [LIST_1][i4][j4][ii]=0;
}
else
{
dec_picture->mv [LIST_0][i4][j4][ii]=(mv_scale * listX[LIST_1 + list_offset][0]->mv[refList][i4][j6][ii] + 128 ) >> 8;
dec_picture->mv [LIST_1][i4][j4][ii]=dec_picture->mv[LIST_0][i4][j4][ii] - listX[LIST_1 + list_offset][0]->mv[refList][i4][j6][ii] ;
}
}
}
}
}
}
}
}
//===== READ BACKWARD MOTION VECTORS =====
currSE.type = SE_MVD;
dP = &(currSlice->partArr[partMap[SE_MVD]]);
if (active_pps->entropy_coding_mode_flag == UVLC || dP->bitstream->ei_flag) currSE.mapping = linfo_se;
else currSE.reading = readMVD_CABAC;
for (j0=0; j0<4; j0+=step_v0)
{
for (i0=0; i0<4; i0+=step_h0)
{
k=2*(j0/2)+(i0/2);
if ((currMB->b8pdir[k]==1 || currMB->b8pdir[k]==2) && (currMB->b8mode[k]!=0))//has backward vector
{
mv_mode = currMB->b8mode[k];
step_h = BLOCK_STEP [mv_mode][0];
step_v = BLOCK_STEP [mv_mode][1];
refframe = dec_picture->ref_idx[LIST_1][img->block_x+i0][img->block_y+j0];
for (j=j0; j<j0+step_v0; j+=step_v)
{
for (i=i0; i<i0+step_h0; i+=step_h)
{
j4 = img->block_y+j;
i4 = img->block_x+i;
// first make mv-prediction
SetMotionVectorPredictor (img, pmv, pmv+1, refframe, LIST_1, dec_picture->ref_idx, dec_picture->mv, i, j, 4*step_h, 4*step_v);
for (k=0; k < 2; k++)
{
TRACE_STRING("mvd_l1");
img->subblock_x = i; // position used for context determination
img->subblock_y = j; // position used for context determination
currSE.value2 = (k<<1) +1; // identifies the component; only used for context determination
dP->readSyntaxElement(&currSE,img,inp,dP);
curr_mvd = currSE.value1;
vec=curr_mvd+pmv[k]; /* find motion vector */
for(ii=0;ii<step_h;ii++)
{
for(jj=0;jj<step_v;jj++)
{
dec_picture->mv [LIST_1][i4+ii][j4+jj][k] = vec;
currMB->mvd [LIST_1][j+jj] [i+ii] [k] = curr_mvd;
}
}
}
}
}
}
}
}
// record reference picture Ids for deblocking decisions
for(i4=img->block_x;i4<(img->block_x+4);i4++)
for(j4=img->block_y;j4<(img->block_y+4);j4++)
{
if(dec_picture->ref_idx[LIST_0][i4][j4]>=0)
dec_picture->ref_pic_id[LIST_0][i4][j4] = dec_picture->ref_pic_num[LIST_0][dec_picture->ref_idx[LIST_0][i4][j4]];
else
dec_picture->ref_pic_id[LIST_0][i4][j4] = -1;
if(dec_picture->ref_idx[LIST_1][i4][j4]>=0)
dec_picture->ref_pic_id[LIST_1][i4][j4] = dec_picture->ref_pic_num[LIST_1][dec_picture->ref_idx[LIST_1][i4][j4]];
else
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