[arm-allstar] simultaneous asterisk and direwolf possible?

Sun Apr 5 23:06:16 EDT 2020

Alan,

The FIFO (AKA: named pipe) code I wrote only uses a small, static amount 
of memory. It won't fill up a filesystem and it also tolerates clients 
coming and going (opening and closing the pipe) transparently.  This has 
all been pretty well tested at this point. The C source code is included, 
have a look at it.

73, David KB4FXC

On Mon, 6 Apr 2020, "Al Beard via ARM-allstar" wrote:

> Hi,
> 
> I've added to /etc/asound.conf on my Pi4B here with HamVOIP and a
> SoundBlaster Play 3! USB device here and tested with:
> arecord -D custom_snoop_hw0
> successfully.
> 
> I'd be cautious about using FIFOs in case one reading process stopped
> and the filesystem filled up.
> 
> pcm.custom_snoop_hw0 {
>     type dsnoop
>     ipc_key 420042     
>     ipc_key_add_uid 1
>     slave {
>         pcm "hw:0,0"   # the actual device
>         format S16_LE
>         channels 2
>         rate 44100
>     }
> }
> 
> Alan VK2ZIW
> 
> On Sun, 5 Apr 2020 17:47:20 -0700, \"Tony via ARM-allstar\" wrote
> > Thanks Doug, the named pipe for direwolf usage was successfully 
> > created by placing "outstreamcmd=/usr/local/bin/nptee,dw" at the top 
> > of the main-node stanza in /etc/asterisk/rpt.conf and restarting asterisk:
> > 
> > [root at yellow ~]# ls -l /tmp/outsound/dw
> > prw-r--r-- 1 root root 0 Apr  5 16:38 /tmp/outsound/dw
> > 
> > I guess I'll have to study carefully both the lame and direwolf 
> > invocations to see what the next problems are:
> > 
> > [root at yellow ~]# lame --preset cbr 16 -r -m m -s 8 --bitwidth 16 
> > /tmp/outsound/dw - 2>/tmp/status | direwolf -t 0 -
> > Dire Wolf version 1.5
> > ...
> > Reading config file direwolf.conf
> > Audio input device for receive: stdin  (channel 0)
> > Audio out device for transmit: default  (channel 0)
> > ALSA lib pcm_dmix.c:1029:(snd_pcm_dmix_open) unable to open slave
> > Could not open audio device default for output
> > Device or resource busy
> > Pointless to continue without audio device.
> > 
> > On 4/5/20 3:35 PM, "Doug Crompton via ARM-allstar" wrote:
> > > A couple of thoughts....
> > >
> > > You could archive the audio and play it back to direwolf.... Don't archive
> > > to the SD card.  Use a USB stick or do it to RAM,
> > >
> > > archivedir=/media/MS1
> > > archiveaudio=1          ; Saving .wav files
> > >
> > > You could use nptee to stream the audio to the other device....
> > >
> > > https://www2.hamvoip.org/nptee_howto.pdf
> > >
> > > *73 Doug, WA3DSP*
> > > *http://wa3dsp.org <http://wa3dsp.org>*
> > >
> > >
> > > On Sun, Apr 5, 2020 at 6:25 PM "Tony via ARM-allstar" <
> > > arm-allstar at hamvoip.org> wrote:
> > >
> > >> My hamvoip node is often connected to an ASL hub node on a large network
> > >> of linked repeaters. Occasionally, we all hear what sound like APRS
> > >> beacons, as they occur regularly every 10 or 15 minutes. The idea occurs
> > >> to me to use "direwolf" to decode these beacons, so that the responsible
> > >> operator can be alerted to their error of beaconing on a linked network
> > >> of FM repeaters.
> > >>
> > >> The initial problem occurs as an inability to share the USB sound card
> > >> audio:
> > >>
> > >> [root at yellow ~]# aplay -l
> > >> **** List of PLAYBACK Hardware Devices ****
> > >> card 0: Device [USB Audio Device], device 0: USB Audio [USB Audio]
> > >>     Subdevices: 0/1
> > >>     Subdevice #0: subdevice #0
> > >>
> > >> [root at yellow ~]# grep -E "^ADEVICE|^ACHANNELS" direwolf.conf
> > >> ADEVICE plughw:0,0 -
> > >> ACHANNELS 1
> > >>
> > >> [root at yellow ~]# direwolf -t 0
> > >> Dire Wolf version 1.5
> > >> ...
> > >> Reading config file direwolf.conf
> > >> Audio device for both receive and transmit: plughw:0,0  (channel 0)
> > >> Could not open audio device plughw:0,0 for input
> > >> Device or resource busy
> > >> Pointless to continue without audio device.
> > >>
> > >> This occurs even if /run/lock/asound.state.lock and its symlink
> > >> /var/lock/asound.state.lock are rm'd. It runs properly if asterisk isn't
> > >> running, but then the ASL audio stream containing the APRS isn't 
> available:
> > >>
> > >> [root at yellow ~]# astdn.sh && direwolf -t 0
> > >> Stopping Asterisk...
> > >> Asterisk ended with exit status 0
> > >> Asterisk shutdown normally.
> > >> Dire Wolf version 1.5
> > >> ...
> > >> Reading config file direwolf.conf
> > >> Audio device for both receive and transmit: plughw:0,0  (channel 0)
> > >> Channel 0: 1200 baud, AFSK 1200 & 2200 Hz, E+, 44100 sample rate / 3,
> > >> DTMF decoder enabled.
> > >> Ready to accept AGW client application 0 on port 8000 ...
> > >> Ready to accept KISS TCP client application 0 on port 8001 ...
> > >>
> > >> Is there some way to get both asterisk and direwolf listening to the
> > >> same audio stream? Or must I use a USB RTL-SDR stream listening on the
> > >> simplex node radio frequency and decode the APRS from among that audio
> > >> stream?
> > >> _______________________________________________
> > >>
> > >> ARM-allstar mailing list
> > >> ARM-allstar at hamvoip.org
> > >> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> > >>
> > >> Visit the BBB and RPi2/3/4 web page - http://hamvoip.org
> > > _______________________________________________
> > >
> > > ARM-allstar mailing list
> > > ARM-allstar at hamvoip.org
> > > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> > >
> > > Visit the BBB and RPi2/3/4 web page - http://hamvoip.org
> > 
> > _______________________________________________
> > 
> > ARM-allstar mailing list
> > ARM-allstar at hamvoip.org
> > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> > 
> > Visit the BBB and RPi2/3/4 web page - http://hamvoip.org
> 
> 
> ---------------------------------------------------
> Alan Beard
> 
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> 