Hi... I am very new to Liquidsoap and I would like some help integrating
a routine into Centova's Liquidsoap implementation.
We want to modify the metadata sent to players from the AutoDJ so that
it includes the Album tag as well as the Artist and Title. We can do
this easily on live sources but not on the AutoDJ. All our AutoDJ audio
files include a valid Album tag.
A month or so ago, Eduardo Martinez kindly provided the following
example to carry out what we want to achieve, using map_metadata. He of
course didn't know about the environment in which this would operate so
it's a general solution:
===
input = playlist("/home/user/music",mode="normal")
def apply_metadata(m) =
title = m["title"]
artist = m["artist"]
album = m["album"]
[("artist","Artist:#{artist}"),("title","Song:#{title} -
Album:#{album}")]
end
input = map_metadata(apply_metadata,input2)
===
This appears to simply append the Album tag to the Title tag, making the
<title> metadata field take the form "Title - Album", which is perfect
and exactly what we do with live sources.
What I do not yet grasp is how to integrate that into the Centova
implementation and I would love some pointers.
Centova has a config file called "centova.liq" which you can't modify,
but it includes "callbacks" - essentially hooks to allow the addition of
extra processing - which call routines in a file called "custom.liq".
The callback for the AutoDJ in the centova.liq file is:
===
# callback to modify autoDJ stream; accepts and must return a source
centovacast.callback_autodj = ref fun(s) -> s
===
and the standard default custom.liq file consists of:
===
# This file will not be modified by Centova Cast. If you wish to add
custom Liquidsoap
# scripting to your stream, add it here and it will automatically be
imported by Liquidsoap.
#
# Note: to add additional processing to the Liquidsoap sources managed
by Centova Cast,
# refer to the centovacast.callback_* functions and their comments at
the top of centovacast.liq.
#
# Example: When streaming from a live source, amplify by 2.0.
# centovacast.callback_live := fun(s) -> amplify(2.0,s)
#
# Example: Add an echo effect to streams from all sources.
# centovacast.callback_all := fun(s) ->
echo(id="custom_echo",delay=0.5,feedback=-6,s)
===
I would be most grateful if someone could tell me what the custom.liq
file should contain to allow AutoDJ sources to have their metadata
processed as we want by Mr Martinez's routine and successfully passed
back. Mr Martinez's routine is a little more extensive than the examples
and I simply don't know the scripting language well enough yet to work
it out and would appreciate some help. Sorry this is such a basic query.
Many thanks in advance!
--Richard E
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