On Wed, 8 Apr 2020, Iain Mott wrote:
Another Asterisk PBX related question. I have the Asterisk service
periodically sending System commands on the host machine when particular
phone extensions are called. The Asterisk service is run by the user
asterisk. I made asterisk a member of the 'audio' group so that it can
use 'aplay' with the System command. eg.
System(aplay -c 1 -D pulse /home/iain/sounds/line1.wav)
This plays OK but plays on the laptop's internal hardware rather via
PulseAudio. Jack is running and is configured to use an external USB
sound card and the PulseAudio Jack Sink.
If I run the following as user iain, it plays correctly through the USB:
aplay -c 1 -D pulse /home/iain/sounds/line1.wav
two users is going to be a problem. Jack has to run as user and is not
system. pulse can be run as a system daemon but I don't know what that
does to a pulse->jack bridge.
Simple solution: use wires. Run the output of the onboard audio to a spare
input on the usb device and run a spare output on the usb device to the
onboard input.
Less simple: use networking. both pulse and jack are able to stream audio
over the network (local host is fine) so run two instances of either jack
or pulse and use networking to join them. I do not know pulse well
enough to give any hints what so ever on network streaming. Jack would be
easier. Just use netjack or zita-njbridge.
Also, ALSA has mixer plugins that may provide an extra phseudo device. I
don't know how that works.
Contrary to popular thought, pulse does not require a display, but it does
require access to a user dbus. Using dbuslaunch to run a screen session
works for this. (at least this has worked for me on a headless system)
--
Len Ovens
www.ovenwerks.net
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user@xxxxxxxxxxxxxxxxxxxx
https://lists.linuxaudio.org/listinfo/linux-audio-user
