Hi,
I'm currently using liquidsoap to read from an icecast server. I also
have a local playlist on the computer which goal is to avoid loss of
sound when the server is unavailable. The script is running on a
debian lenny computer (PIV, 192Mo for RAM - no GUI !). I'm getting a
little problem :
I'm using metadata to launch a little script (with the metadata on
arguments) with the on_metadata operator. The problem is that on
every metadata update received from the icecast server, I'm getting a
small alsa underrun (but can be heard...). I thinked it was due to my
script but, when I'm running on the backup playlist, I don't have any
underrun... Here is the script :
-------------------------
# importation
%include "config.liq.aux"
# fonction pratique
def crossfade(cur,next)
add(id=source.id(next), normalize=false,
[ sequence([ blank(duration=1.),
fade.initial(duration=2.,next)]),
fade.final(duration=2.,cur) ])
end
def updateStatus(meta)
# Le script qui sera exécuté ici devra être RAPIDE car tournant dans
le thread principal!
# system()
x = string.ref("")
get = fst(x)
set = snd(x)
def makeArgs(meta)
def replacer(txt)
"<apo/>"
end
txt = "<Tag>"^fst(meta)^"="^snd(meta)^"</Tag>"
txt = string.replace(pattern="'", replacer, txt)
set("'"^txt^"' "^get())
end
list.iter(makeArgs, meta)
log(get())
system(metaUpdaterCommand^" "^get()^" &")
end
# Structure radio
playlist = playlist.safe(reload=86400, DB^"/safe/songs/")
secours=playlist
main = strip_blank(length=15., threshold=-60.,
input.http(id="mainStream", buffer=3., max=5., mainStream))
radio= fallback(transitions = [crossfade, crossfade],
track_sensitive=false, [main, secours])
# This allow the use of metaData for title updates and commands
out = on_metadata(updateStatus, radio)
# sortie son
%include "out.liq.aux"
-----------------------------------------------------------------------------------------
It's important that the metadata are used for this purpose so I can't
avoid this use.
Is there any configuration tweaking that could be used to avoid this
lazy behaviour? (maybe having greater buffer?)
Another problem is that this script switch sometimes to the backup
playlist for less than 10 seconds without any apparent reason. Could
it be dur to an empty buffer for the http input?
Thanks for your help,
Simon
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