[Savonet-users] playlist reloading

[Rafael K. <raf...@gm...>]

Hi guys!

Thank you for such a great tool as liquidsoap, but I have a problem with
the playlist. I'm working on some online radio and I have the following
liquidsoap script:

# This function is called when
# a new metadata block is passed in
# the stream.
def apply_metadata(m) =
  title = m["filename"]
  print("Now playing: #{title}")

  filename = string.split(separator="/",title) # rozdelime cestu po
lomitkach
  filename = list.nth(list.rev(filename),0) # vezmeme meno suboru
  filename = list.nth(string.split(separator="\.",filename),0) # odpojime
koncovku .mp3

  command = "python3.3 feedback.py " ^ filename
  system(command)
end

#!/usr/bin/liquidsoap
# Log dir
set("log.file.path","/tmp/basic-radio.log")

#tidy up before playing playlist
playlist_file = "playlist.m3u"
system("python3.3 feedback.py -init")

# Music
myplaylist =
playlist(mode="normal",playlist_file,reload_mode="rounds",reload=1)

myplaylist = on_track(apply_metadata,myplaylist)

# Stream it out
output.icecast(%mp3, host = "localhost", port = 8080, password = "baldur",
mount = "stream", myplaylist, fallible=true)

As you can see - every time a new track starts, liquidsoap calls a python
script - feedback.py, and every round the playlist reloads. I have 5 songs
in the playlist file. This script shifts the playlist file and adds a new
song to it (it will have a complex algorithm to compute which song is next
to add, now it has only random, for testing.

Then I expected, that liquidsoap will reload the playlist as soon as the
round ends and continue playing the next songs. It reloads it, but too soon
and it results in repeated playing of some songs. Then I figured out, that
the playlist is actually reloaded BEFORE the round is finished and it's
written also in the specification.

It would be nice if I could hook on the event of playlist reloading, but I
couldn't find how to do this. Or simply to be sure, that the playlist will
be reloaded after the round is ended. Now I hacked it with adding "fail
tracks" which aren't songs but just silence and appended it to the
beginning and the end of the playlist, but I think, it's quite dirty and I
don't believe, that it is reliable, because liquidsoap can reload the
playlist at any time, not just few songs before the end of the playlist if
I understand good.

I thought also about using playlist.once and killing liquidsoap after every
round and harboring the stream to another script, but I think it is quite
dirty too. Can you, please, suggest me, how to solve this problem in some
cleaner way or implement some methods that will make it easier in the
future if you are developer?

Thaks in advance :)