Hi !
Le vendredi 17 septembre 2010 11:56:51, Brandon Casci a écrit :
> I see....so you the request script would return some output in addition to
> the song uri, is that correct?
>
> What would the output look like?
Indeed !
On RadioPi, the request script returns URI of the form:
annotate:type="foo",bla2="foo2":/path/to/file.mp3
(in fact the file is a FTP uri)
In our custom smart_crossfade, we have this:
if ma["type"] == "jingles" or mb["type"] == "jingles" then
log("Old or new file is a jingle: sequenced transition.")
sequence([sa, sb])
elsif
Unfortunately the online radiopi script is not up to date. The full code for
the smart_crossfade is:
# Custom crossfade to deal with jingles..
def smart_crossfade (~start_next=5.,~fade_in=3.,~fade_out=3.,
~default=(fun (a,b) -> sequence([a, b])),
~high=-15., ~medium=-32., ~margin=4.,
~width=2.,~conservative=false,s)
fade.out = fade.out(type="sin",duration=fade_out)
fade.in = fade.in(type="sin",duration=fade_in)
add = fun (a,b) -> add(normalize=false,[b, a])
log = log(label="smart_crossfade")
def transition(a,b,ma,mb,sa,sb)
list.iter(fun(x)-> log(level=4,"Before: #{x}"),ma)
list.iter(fun(x)-> log(level=4,"After : #{x}"),mb)
if ma["type"] == "jingles" or mb["type"] == "jingles" then
log("Old or new file is a jingle: sequenced transition.")
sequence([sa, sb])
elsif
# If A and B are not too loud and close, fully cross-fade them.
a <= medium and b <= medium and abs(a - b) <= margin
then
log("Old <= medium, new <= medium and |old-new| <= margin.")
log("Old and new source are not too loud and close.")
log("Transition: crossed, fade-in, fade-out.")
add(fade.out(sa),fade.in(sb))
elsif
# If B is significantly louder than A, only fade-out A.
# We don't want to fade almost silent things, ask for >medium.
b >= a + margin and a >= medium and b <= high
then
log("new >= old + margin, old >= medium and new <= high.")
log("New source is significantly louder than old one.")
log("Transition: crossed, fade-out.")
add(fade.out(sa),sb)
elsif
# Opposite as the previous one.
a >= b + margin and b >= medium and a <= high
then
log("old >= new + margin, new >= medium and old <= high")
log("Old source is significantly louder than new one.")
log("Transition: crossed, fade-in.")
add(sa,fade.in(sb))
elsif
# Do not fade if it's already very low.
b >= a + margin and a <= medium and b <= high
then
log("new >= old + margin, old <= medium and new <= high.")
log("Do not fade if it's already very low.")
log("Transition: crossed, no fade.")
add(sa,sb)
# What to do with a loud end and a quiet beginning ?
# A good idea is to use a jingle to separate the two tracks,
# but that's another story.
else
# Otherwise, A and B are just too loud to overlap nicely,
# or the difference between them is too large and overlapping would
# completely mask one of them.
log("No transition: using default.")
default(sa, sb)
end
end
smart_cross(width=width, duration=start_next, conservative=conservative,
transition,s)
end
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