Hello! I've been running into this issue a bit over the last few months, and I
recently attempted to fix it only to discover that I made it much worse.
The situation is a basic one: fading between the AutoDJ's music and an incoming
live broadcast. I've set up a `live_enabled` switch to prevent some issues
where intermittent connectivity caused DJs to fade constantly back and forth
between the AutoDJ and their stream; this replaces that with a quick 2-second
fallback silence for the duration they're connected:
```
live_enabled = ref false
def live_connected(header) =
live_enabled := true
end
def live_disconnected() =
live_enabled := false
end
# ...radio defined previously
# Live Broadcasting
live = audio_to_stereo(input.harbor("/", id="azuratest_radio_input_streamer",
port=8005, user="shoutcast", auth=dj_auth, icy=true, max=30., buffer=5.,
icy_metadata_charset="UTF-8", metadata_charset="UTF-8",
on_connect=live_connected, on_disconnect=live_disconnected))
ignore(output.dummy(live, fallible=true))
live = fallback(id="azuratest_radio_live_fallback", track_sensitive=false,
[live, blank(duration=2.)])
radio = switch(id="azuratest_radio_live_switch", track_sensitive=false,
[({!live_enabled}, live), ({true}, radio)])
```
This is causing an abrupt jump both when the DJ connects and when they
disconnect. When connecting, the AutoDJ stream immediately stops and the live
DJ stream immediately starts, with no transition. When stopping, the AutoDJ
starts back up again at full volume, with the live signal "fading" into the
full-volume AutoDJ. Neither of these are desirable effects.
To help resolve this, I tried assigning a custom transition to the live DJ
switch that performed a very simple fade:
```
def simple_crossfade(a,b) =
add([fade.initial(duration=3.,b),fade.final(duration=3.,a)])
end
radio = switch(id="azuratest_radio_live_switch", track_sensitive=false,
transitions=[simple_crossfade], [({!live_enabled}, live), ({true}, radio)])
```
...but this yields even more inconsistent results and still no smooth fading
between the two.
Am I doing something obviously wrong? I get the feeling I am, but despite years
of hammering away at the Liquidsoap internal language I sometimes don't feel as
though I understand it.
Any help would be appreciated.
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