Hi, all...
I have now successfully implemented this feature.
The requirement here is to get a liquidsoap AutoDJ on a Centova v3
system to include the Album name in the metadata it sends to a player,
and so that the information is also accessible by StreamLicensing if you
use them, where including the Album tag is now mandatory (and a good
idea, as you can indicate non-copyright items like jingles or sponsor
messages with the Album tag "*****" and reduce your TLH accordingly).
Here is what you need to do to enable this facility. You obviously need
server access.
Go to the liquidsoap directory for the appropriate stream as follows.
From
/usr/local/centovacast/var/vhosts
cd to the appropriate vhost then go to
etc/liquidsoap
Edit the file custom.liq - by all means make a backup copy of it first.
Insert the following:
def apply_metadata(m) =
title = m["title"]
artist = m["artist"]
album = m["album"]
[("artist","#{artist}"),("title","#{album} - #{title}")]
end
centovacast.callback_autodj := fun(s) -> map_metadata(apply_metadata,s)
This routine grabs the title, artist and album from the audio file on
the server (obviously the audio files on your Centova system need to
have a valid Album tag). It then writes the Artist field unchanged but
rewrites the Title field to take the form "Album - Title".
This order means that the Centova Now Playing widgets will display the
right fields in the right order.
The callback shown ensures that this feature only applies to the AutoDJ
- your live sources ought to be able to send this themselves, and if
they can't this data won't be in the stream anyway.
It's possible that StreamLicensing wants to see these the other way
round (sigh) - in which case you reverse "album" and "title" in the
expression "#{album} - #{title}". This will screw the widget but you
can't have everything.
I am a beginner with liquidsoap so I probably can't answer much in the
way of questions on the implementation.
Many thanks to list member Eduardo Martinez for the original
map_metadata example from which I was ultimately able to solve this, and
to other list members who have contributed helpful suggestions.
--Richard E
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