Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion. Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules.

 Doom9's Forum Multiple statements on a single line
 Register FAQ Calendar Search Today's Posts Mark Forums Read

 26th March 2013, 09:13 #1  |  Link fvisagie Registered User   Join Date: Aug 2008 Location: Isle of Man Posts: 588 Multiple statements on a single line This is probably old hat to the old-timers here, but I stumbled across something quite exciting. Avisynth does support multiple statements on a single line, in contradiction to Multiple Avisynth statements on a single line can only be achieved in the context of OOP notation or embedding filters as parameters of another function. This seems to be supported for normal statements, by Eval() etc. and opens up a whole new world (for me at least ) of things like simple conditional block statements. This is with 2.6.0, I haven't tested with earlier versions. Here's an example of a trivial function returning multiple values Code: ```#------------------------------------------- # ColourCoefficients 1.0.0 # Generates specified colour matrix coefficient values # # Useful when # # Doing YUV<->RGB colourspace calculations or conversions # Doing colour coefficient calculations or conversions # # ColourCoefficients(string "matrix") # # Colour coefficient matrix which to generate coefficients for - "Rec601" / "Rec709" / "FCC", default "Rec601" # # Usage # # coeffs = ColourCoefficients("Rec709") # ColourCoefficients returns a multi-statement string with matrix coefficient value assignments # Eval(coeffs) # This defines Kr containing Red channel coefficient, Kg with Green channel coefficient and Kb for Blue channel # y = Kr*r + Kg*g + Kb*b # ... # # References # # http://avisynth.org/mediawiki/Color_conversions # # Version history # # 1.0.0 Francois Visagie # function ColourCoefficients(string "matrix") { matrix = Default(matrix, "Rec601") matrixnum = (matrix == "Rec601") ? 0 : \ (matrix == "Rec709") ? 1 : \ (matrix == "FCC" ) ? 2 : 3 Assert(matrixnum < 3, """'matrix' value """" + matrix + """" is invalid""") # Channel coefficients Rec.601 Rec.709 FCC Kr = Select(matrixnum, 0.299, 0.2125, 0.3 ) Kg = Select(matrixnum, 0.587, 0.7154, 0.59) Kb = Select(matrixnum, 0.114, 0.0721, 0.11) return("Kr=" + string(Kr) + " Kg=" + string(Kg) + " Kb=" + string(Kb)) }``` To what extent has anyone else played with this, and what gotchas have been discovered so far?