public Vector Scale(int h_shift, int v_shift)
{
Vector o = new Vector();
o.namespace_global = namespace_global;
o.pred_mode = pred_mode;
o.dx[0] = dx[0] >> h_shift;
o.dx[1] = dx[1] >> h_shift;
o.dy[0] = dy[0] >> v_shift;
o.dy[1] = dy[1] >> v_shift;
return o;
}
private void VectorPrediction(Vector mv, int x, int y, int mode)
{
int n = 0;
int[] vx = new int[3];
int[] vy = new int[3];
if(x > 0) {
Vector ov = GetVector(x-1, y);
if(!ov.namespace_global &&
(ov.pred_mode & mode) != 0) {
vx[n] = ov.dx[mode-1];
vy[n] = ov.dx[mode-1];
n++;
}
}
if(y > 0) {
Vector ov = GetVector(x, y-1);
if(!ov.namespace_global &&
(ov.pred_mode & mode) != 0) {
vx[n] = ov.dx[mode-1];
vy[n] = ov.dx[mode-1];
n++;
}
}
if(x > 0 && y > 0) {
Vector ov = GetVector(x - 1, y - 1);
if(!ov.namespace_global &&
(ov.pred_mode & mode) != 0) {
vx[n] = ov.dx[mode-1];
vy[n] = ov.dy[mode-1];
n++;
}
}
switch(n) {
case 0:
mv.dx[mode-1] = 0;
mv.dy[mode-1] = 0;
break;
case 1:
mv.dx[mode-1] = vx[0];
mv.dy[mode-1] = vy[0];
break;
case 2:
mv.dx[mode-1] = (vx[0] + vx[1] + 1) >> 1;
mv.dy[mode-1] = (vy[0] + vy[1] + 1) >> 1;
break;
case 3:
mv.dx[mode-1] = Util.Median(vx);
mv.dy[mode-1] = Util.Median(vy);
break;
}
}
private void SetVector(Vector mv, int x, int y)
{
vecs[x + y*par.x_num_blocks] = mv;
}
private short PredictPixel(Vector mv, int x, int y, int k)
{
if(mv.namespace_global) {
for(int i = 0; i < par.num_refs; i++) {
par.global[i].GetVector(mv, x, y, i);
}
if(k != 0)
mv = mv.Scale(chroma_h_shift, chroma_v_shift);
}
short weight = (short)(par.picture_weight_1 + par.picture_weight_2);
short val = 0;
int px, py;
switch(mv.pred_mode) {
case 1:
px = (x << par.mv_precision) + mv.dx[0];
py = (y << par.mv_precision) + mv.dy[0];
val = (short)(weight*PredictSubPixel(0, px, py));
break;
case 2:
px = (x << par.mv_precision) + mv.dx[1];
py = (y << par.mv_precision) + mv.dy[1];
val = (short)(weight*PredictSubPixel(1, px, py));
break;
case 3:
px = (x << par.mv_precision) + mv.dx[0];
py = (y << par.mv_precision) + mv.dy[0];
val = (short)(par.picture_weight_1*PredictSubPixel(0, px, py));
px = (x << par.mv_precision) + mv.dx[1];
py = (x << par.mv_precision) + mv.dy[1];
val += (short)(par.picture_weight_2*PredictSubPixel(1, px, py));
break;
default:
break;
}
return (short)Util.RoundShift(val, par.picture_weight_bits);
}
private Vector GetVector(int x, int y)
{
int pos = x + y*par.x_num_blocks;
if(vecs[pos] == null) {
vecs[pos] = new Vector();
}
return vecs[pos];
}
private void DecodePredictionUnit(Vector mv, int x, int y)
{
mv.pred_mode = ModePrediction(x,y);
mv.pred_mode ^= ar[ARITH_PRED_MODE].DecodeBit(Context.BLOCK_MODE_REF1);
if(par.num_refs > 1) {
mv.pred_mode ^= (ar[ARITH_PRED_MODE].DecodeBit(Context.BLOCK_MODE_REF2) << 1);
}
if(mv.pred_mode == 0) {
int[] pred = new int[3];
DcPrediction(x,y,pred);
mv.dc[0] = pred[0] +
ar[ARITH_DC_0].DecodeSint(Context.LUMA_DC_CONT_BIN1,
Context.LUMA_DC_VALUE,
Context.LUMA_DC_SIGN);
mv.dc[1] = pred[1] +
ar[ARITH_DC_1].DecodeSint(Context.CHROMA1_DC_CONT_BIN1,
Context.CHROMA1_DC_VALUE,
Context.CHROMA1_DC_SIGN);
mv.dc[2] = pred[2] +
ar[ARITH_DC_2].DecodeSint(Context.CHROMA2_DC_CONT_BIN1,
Context.CHROMA2_DC_VALUE,
Context.CHROMA2_DC_SIGN);
} else {
int pred_x, pred_y;
if(par.have_global_motion) {
int pred = GlobalPrediction(x,y);
pred ^= ar[ARITH_SUPERBLOCK].DecodeBit(Context.GLOBAL_BLOCK);
mv.namespace_global = (pred == 0 ? false : true);
} else {
mv.namespace_global = false;
}
if(!mv.namespace_global) {
if((mv.pred_mode & 1) != 0) {
VectorPrediction(mv,x,y,1);
mv.dx[0] +=
ar[ARITH_REF1_X].DecodeSint(Context.MV_REF1_H_CONT_BIN1,
Context.MV_REF1_H_VALUE,
Context.MV_REF1_H_SIGN);
mv.dy[0] +=
ar[ARITH_REF1_Y].DecodeSint(Context.MV_REF1_V_CONT_BIN1,
Context.MV_REF1_V_VALUE,
Context.MV_REF1_V_SIGN);
}
if((mv.pred_mode & 2) != 0) {
VectorPrediction(mv, x, y, 2);
mv.dx[1] += ar[ARITH_REF2_X].DecodeSint(Context.MV_REF2_H_CONT_BIN1,
Context.MV_REF2_H_VALUE,
Context.MV_REF2_H_SIGN);
mv.dy[1] += ar[ARITH_REF2_Y].DecodeSint(Context.MV_REF2_V_CONT_BIN1,
Context.MV_REF2_V_VALUE,
Context.MV_REF2_V_SIGN);
}
}
}
mv.namespace_global = false;
mv.dx[0] = 0;
mv.dy[0] = 0;
mv.dx[1] = 0;
mv.dy[1] = 0;
}