/* Maybe we should rewrite this namespace blocks.
* I'm not sure */
public void DecodeCoeffs(ref short[] c)
{
if(buf == null)
return;
int[] bounds = {0,0,0};
if(par.no_ac) {
Unpack u = new Unpack(buf);
if(numX * numY == 1) {
bounds[1] = c.Length;
bounds[2] = frame.Width;
DecodeCodeBlock(ref c,u,bounds);
return;
}
for(int y = 0; y < numY; y++) {
for(int x = 0; x < numX; x++) {
if(u.DecodeBool())
continue;
if(par.codeblock_mode_index != 0)
qi += u.DecodeSint();
CalculateBounds(bounds,x,y);
DecodeCodeBlock(ref c,u,bounds);
}
}
} else {
Arithmetic a = new Arithmetic(buf);
if(numX * numY == 1) {
bounds[1] = c.Length;
bounds[2] = frame.Width;
DecodeCodeBlock(ref c, a, bounds);
return;
}
for(int y = 0; y < numY; y++) {
for(int x = 0; x < numX; x++) {
if(a.DecodeBool(Context.ZERO_CODEBLOCK))
continue;
if(par.codeblock_mode_index != 0)
qi += a.DecodeSint(Context.QUANTISER_CONT,
Context.QUANTISER_VALUE,
Context.QUANTISER_SIGN);
CalculateBounds(bounds, x, y);
DecodeCodeBlock(ref c, a, bounds);
}
}
}
}
private void DecodeLineGeneric(ref short[] c, Arithmetic a, int lineOffset,
int blockWidth, int qf, int qo)
{
int y = (lineOffset - offset)/(stride*frame.Width);
int x = ((lineOffset)%(frame.Width))/stride;
int parentLine = (y/2)*(2*frame.Width*stride);
int parentOffset = (orient == 1 ? stride :
(orient == 2 ? stride*frame.Width :
stride*frame.Width + stride));
for(int i = lineOffset; i < blockWidth + lineOffset; i += stride) {
bool zparent = true, znhood = true;
if(level > 0) {
zparent = (c[parentLine + parentOffset+(x/2)*stride*2] == 0);
}
if(x > 0) znhood = (znhood && c[i-stride] == 0);
if(y > 0) znhood = (znhood && c[i-stride*frame.Width] == 0);
if(x > 0 && y > 0)
znhood = (znhood && c[i-stride-stride*frame.Width] == 0);
int cont = 0, sign = 0;
if(zparent) {
cont = (znhood ? Context.ZPZN_F1 : Context.ZPNN_F1);
} else {
cont = (znhood ? Context.NPZN_F1 : Context.NPNN_F1);
}
int v = a.DecodeUint(cont, Context.COEFF_DATA);
if(orient == 1 && y > 0) {
sign = c[i - frame.Width*stride];
} else if(orient == 2 && x > 0) {
sign = c[i - stride];
}
sign = (sign > 0 ? Context.SIGN_POS :
(sign < 0 ? Context.SIGN_NEG : Context.SIGN_ZERO));
if(v > 0) {
v = (v * qf + qo + 2) >> 2;
v = (a.DecodeBool(sign) ? -v : v);
}
c[i] = (short)v;
x++;
}
}
