43 lines
1.8 KiB
Text
43 lines
1.8 KiB
Text
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# Tweaked custom crossfade to deal with jingles..
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def smart_cross(~start_next=5.,~fade_in=3.,~fade_out=3.,
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~default=(fun (a,b) -> sequence([a, b])),
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~high=-15., ~medium=-32., ~margin=4.,
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~width=2.,~conservative=false,s)
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fade.out = fade.out(type="sin", duration=fade_out)
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fade.in = fade.in(type="sin", duration=fade_in)
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add = fun (a,b) -> add(normalize=false, [b, a])
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log = log(label="smart_cross")
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def transition(a,b,ma,mb,sa,sb)
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list.iter(fun(x)-> log(level=4, "Before: #{x}"), ma)
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list.iter(fun(x)-> log(level=4, "After : #{x}"), mb)
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if ma["type"] == "J" or mb["type"] == "J" then
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log("Old or new file is a jingle: sequenced transition.")
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sequence([sa, sb])
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elsif
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# Do not fade if it's already very low.
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b >= a + margin and a <= medium and b <= high
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then
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log("new >= old + margin, old <= medium and new <= high.")
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log("Do not fade if it's already very low.")
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log("Transition: crossed, no fade.")
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add(sa, sb)
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# What to do with a loud end and a quiet beginning ?
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# A good idea is to use a jingle to separate the two tracks,
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# but that's another story.
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else
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# Otherwise, A and B are just too loud to overlap nicely,
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# or the difference between them is too large and overlapping would
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# completely mask one of them.
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# log("No transition: using default.")
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# default(sa, sb)
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log("Transition: crossed, fade-in, fade-out.")
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add(fade.out(sa), fade.in(sb))
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end
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end
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cross(width=width, duration=start_next,
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conservative=conservative, transition,s)
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end
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