Per Romain’s advice, I am successfully using pulseaudio to receive music from a
virtual audio device. The virtual audio device is capturing (like Jack) audio
from a music player that can alternate between play and pause modes.
QUESTION: Is there a way to call a handler when the audio stream from the
virtual audio device starts after having been paused?
My attempts to use the on_connect & on_start callback functions in
input.pulseaudio and output.icecast were unsuccessful. In both cases each of
the functions was called as soon as liquidsoap launched, but were never called
again regardless of my switching the music player between pause and play modes.
The pause->play transition should have been detectable by liquidsoap because
icecast server did detect it. When the music player paused, icecast dropped
the connection to liquidsoap and its mountpoint, and then liquidsoap would log
the errors:
Error while sending data: could not write data to host: Broken pipe in
write()!
Closing connection...
Will try to reconnect in 3.00 seconds.
icecast promptly reinstated its connection to liquidsoap and its mountpoint
when the music player resumed play mode, but the on_connect & on_start
functions were not called.
Do I need to use on_blank() instead of on_start()? If so, can you please
provide the code? It’s unclear to me how the source argument and source result
of on_blank() should should be associated with input.pulseaudio() in the
following command:
output.icecast(%ogg(%flac(compression=5)),
input.pulseaudio(device="4", fallible=true, on_start=pulse_start(),
on_start=pulse_start()),
fallible=true, host="localhost", port=8000, password="sourcepwd",
mount="mystream", format="audio/ogg”,
on_connect=on_connect(), on_start=on_start())
Each callback function was as follows except for the function name and echo’d
text:
def pulse_start()
system ('echo "pulse" >>
/usr/local/hqp_liquidsoap/log/on_start_on_connect_LOG.log')
{()}
end
Thanks very much for your help,
Bob Stern
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