From Avisynth
# Changes 2008-08-18: (Didée)
# - Replaced the ugly stackXXX cascade with mt_LutSpa() (requires MaskTools v2.0a35)
# - Changed Quant and Offset defaults to 24,28,2,4,4,8
function Deblock_QED ( clip clp, int "quant1", int "quant2",
\ int "aOff1", int "bOff1", int "aOff2", int "bOff2", int "uv" )
{
quant1 = default( quant1, 24 )
quant2 = default( quant2, 28 )
aOff1 = default( aOff1, 2 )
bOff1 = default( bOff1, 4 )
aOff2 = default( aOff2, 4 )
bOff2 = default( bOff2, 8 )
uv = default( uv, 3 ) # u=3 -> use proposed method for chroma deblocking
# u=2 -> no chroma deblocking at all (fastest method)
ox = clp.width() # u=1|-1 -> directly use chroma debl. from the normal|strong deblock()
oy = clp.height()
block = clp.mt_LutSpa(false,"x 1 + 8 % 1 < x 8 % 1 < y 1 + 8 % 1 < y 8 % 1 < | | | 255 0 ?",U=3,V=3)
# create normal deblocking (for block borders) and strong deblocking (for block interiour)
normal = clp.deblock(quant=quant1,aOffset=aOff1,bOffset=bOff1)
strong = clp.deblock(quant=quant2,aOffset=aOff2,bOffset=bOff2)
# build difference maps of both
normalD = mt_makediff(clp,normal,chroma=uv>2?"process":"ignore")
strongD = mt_makediff(clp,strong,chroma=uv>2?"process":"ignore")
# separate border values of the difference maps, and set the interiours to '128'
strongD2 = mt_lutxy(StrongD,block,expr="y 255 == x 128 ?",U=uv,V=uv)
normalD2 = mt_lutxy(normalD,block,expr="y 255 == x 128 ?",U=uv,V=uv)
# interpolate the border values over the whole block: DCTFilter can do it. (Kiss to Tom Barry!)
# (Note: this is not fully accurate, but a reasonable approximation.)
strongD3 = strongD2.mt_lut(expr="x 128 - 1.01 * 128 +",U=uv,V=uv).dctfilter(1.0,1.0,0.0,0.0,0.0,0.0,0.0,0.0)# .yv12lut("x 128 - 2 / 128 +")
# apply compensation from "normal" deblocking to the borders of the full-block-compensations calculated
# from "strong" deblocking ...
strongD4 = mt_lutxy(strongD3,normalD2,expr="y 128 == x y ?",U=uv,V=uv)
# ... and apply it.
deblocked= mt_makediff(clp,strongD4,chroma=uv>2?"process":"ignore")
# simple decisions how to treat chroma
deblocked = (uv<0) ? deblocked.mergechroma(strong) : uv<2 ? deblocked.mergechroma(normal) : deblocked
deblocked
return( last )
}
