Hi Brandon!
Le 13 juillet 2011 23:09, Brandon Casci <[email protected]> a écrit :
> I've implemented a custom crossfade based from one of the examples. The
> crossfade works great, but metadata updates to icecast always stop after the
> second track is played. If I restart liquidsoap metadata updates will
> resume, but will stop after the second track is played. Metadata updates
> process as usual when I remove the crossfade code. I'm using a trunk version
> of liquidsoap that's about 2 or three weeks old. Any theories?
Sure!
> Here is a
> snippet of the code:
>
>
> def my_crossfade (~start_next=5.,~fade_in=3.,~fade_out=3.,
> ~default=(fun (a,b) -> sequence([a, b])),
> ~high=-15., ~medium=-32., ~margin=4.,
> ~width=2.,~conservative=false,s)
> fade.out = fade.out(type="sin",duration=fade_out)
> fade.in = fade.in(type="sin",duration=fade_in)
> add = fun (a,b) -> add(normalize=false,[b, a])
> log = log(label="smart_crossfade")
>
> def transition(a,b,ma,mb,sa,sb)
>
> list.iter(fun(x)-> log(level=4,"Before: #{x}"),ma)
> list.iter(fun(x)-> log(level=4,"After : #{x}"),mb)
> if ma["crossfade"] == "yes" and mb["crossfade"] == "yes" then
> add(fade.initial(type="sin", sb),fade.final(type="sin", sa))
This is your problem: add only relays metadata of the first stream.
Therefore, you should write:
add([fade.final(type="sin", sa),fade.initial(type="sin", sb)])
(BTW: it should be an array of sources I think..)
> else
> log("No transition defined: using default.")
> default(sa, sb)
> end
> end
>
> smart_cross(width=width, duration=start_next,
> conservative=conservative,transition,s)
> end
>
> live_broadcast = input.http(id="live_broadcast_url", buffer = 5.0,
> "http://#{live_server}:#{live_port}#{live_mount}";)
> live_broadcast = nrj(live_broadcast)
> local_playlist = playlist(id = "local_playlist", mode = "normal",
> "content.m3u")
> local_playlist =
> request.dynamic(id="local_playlist",{request.create(get_process_output("#{track_script}
> #{channel_id}"))})
> local_playlist = rewrite_metadata(
> [
> ("title", '$(if $(player_title),"$(player_title)","$(title)")'),
> ],
> local_playlist)
I have two minor remarks concerning this: I happen to think this
rewrite syntax is rather obscure. I personally prefer to use
map_metadata this way:
# This will only update by default so
# we only need to return the fields that
# need to be updated..
def update_meta(m) =
if m["player_title"] != "" then
[("title",m["player_title")]
else
[]
end
end
local_playlist = map_metadata(update_meta,local_playlist)
Romain
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