Display next tracks metadata - ai-radio

[WittyWidget]

I am using the ai-radio template from @gAlleb and @toots. I attempted to add the following code, but instead of displaying the upcoming track's metadata, it is showing the variables. I also tried using next_song, but it throws an error.

## Display for the next track's metadata
background =
  video.add_text(
    color=0xFCB900,
    font=font,
    size=rem(1.5),
    x=px(234),
    y=px(4800), 
    "%{next_song()['title']} by %{next_song()['artist']}",
    background
  )

next_song,

## Display for the next track's metadata
background =
  video.add_text(
    color=0xFCB900,
    font=font,
    size=rem(1.5),
    x=px(234),
    y=px(4800), 
    next_song,
    background
  )

am trying hard to learn Liquidsoap, and I’m new to this field.

[gAlleb]

Hi! The logic is:

You need to set the variable first and then populate it with data. When using Liquidsoap with one playlist it's pretty straightforward. Say you have 1 playlist: radio = playlist("./music.m3u")

What you need to do is to add a check_next function to it so it will fetch and log your next song somewhere. In our case it will assign next song value to a var:

# We set up an empty ref
next_song = ref("")

# Next we set up check function that will check playlist for the next song and assign a string with data to `next_song` ref.
def check(r)
  if request.resolve(r) then
  m = request.metadata(r)

  next_song := "Next: #{metadata.artist(m)} - #{metadata.title(m)}"

  true
  else
  false
  end
end

# Within our playlist operator we then use the above function. So it will check the next track and log it to the ref.
radio = playlist(check_next=check,"./music/music.m3u")


# other stuff ...


# Then we use that ref to show it on screen

## Display for the next track's metadata
background =
  video.add_text(
    color=0xFCB900,
    font=font,
    size=rem(1.5),
    x=px(234),
    y=px(4800), 
    {next_song()},
    background
  )

That was for 2.3.x. If you are using 2.2.5 you need to modify your check function:

def check(r)
 
  m = request.metadata(r)
  next := "Next: #{metadata.artist(m)} - #{metadata.title(m)}"
  true

end