DC_FILT_COEFF1
par->hcoeff[i] = read_dc(par, DC_FILT_COEFF1);
par->vcoeff[i] = read_dc(par, DC_FILT_COEFF1);
case DC_FILT_COEFF1:
write_dc(par, DC_FILT_COEFF1, par->hcoeff[i]);
write_dc(par, DC_FILT_COEFF1, par->vcoeff[i]);