[LAU] Service/user not using PulseAudio

[Iain Mott]

Hi,

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

However via the Aterisk service, or by running the command in a console 
as asterisk, it plays through the internal speakers. eg.

sudo -H -u asterisk bash -c 'aplay -c 1 -D pulse 
/home/iain/sounds/line1.wav'

I don't know if the "-D pulse" option is necessary, I'm trying lots of 
things...

As well as the audio group, I've tried adding asterisk to the pulse and 
pulse-access groups, but it doesn't help (and yes, I logged out and in 
again).

If i run the last code given above with aplay in verbose mode (-vvv), it 
throws the error:

xcb_connection_has_error() returned true

But this Is not error because adding "unset DISPLAY ; " to the start of 
the command removes the error but it continues to play through the 
external speakers. Here is the print for the command:

iain at samsung:~$ sudo -H -u asterisk bash -c 'unset DISPLAY ; aplay -vvvv 
-c 1 -D pulse /home/iain/sounds/line1.wav'
Tocando WAVE '/home/iain/sounds/line1.wav' : Signed 16 bit Little 
Endian, Taxa 48000 Hz, Mono
ALSA <-> PulseAudio PCM I/O Plugin
Its setup is:
   stream       : PLAYBACK
   access       : RW_INTERLEAVED
   format       : S16_LE
   subformat    : STD
   channels     : 1
   rate         : 48000
   exact rate   : 48000 (48000/1)
   msbits       : 16
   buffer_size  : 24000
   period_size  : 6000
   period_time  : 125000
   tstamp_mode  : NONE
   tstamp_type  : GETTIMEOFDAY
   period_step  : 1
   avail_min    : 6000
   period_event : 0
   start_threshold  : 24000
   stop_threshold   : 24000
   silence_threshold: 0
   silence_size : 0
   boundary     : 6755399441055744000
iain at samsung:~$

Any suggestions please?

Thanks,

Iain