[arm-allstar] simultaneous asterisk and direwolf possible?

[David McGough]

Alan,

The nptee software is code that I wrote and is included in all updated 
HamVoIP systems. See this directory: /usr/src/utils/nptee/

Here is a list message explaining its operation:

http://lists.hamvoip.org/pipermail/arm-allstar/2019-October/013436.html


73, David KB4FXC


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

> Hi Tony,
> 
> Simultaneous reading of a sound card.
> 
> Care must be taken to not "thieve" audio packets from the application.
> eg. with additions to your ~/.asoundrc file.
> 
> Doug, google can't find "nptee", did you mean "nettee"?
> 
> From:
> https://superuser.com/questions/1248439/can-i-pipe-input-from-a-linux-
> soundcard-into-2-different-applications
> 
> I accepted dirkt's answer which got me most of the way there. Turns out I 
> needed to create a dsnoop interface:
> 
> /etc/asound.conf
> 
> pcm.custom_snoop_card {
>     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
>     }
> }
> Now I can specify device = custom_snoop_card in my darkice config, and 
> simultaneously make a WAV recording with arecord -D custom_snoop_card -f S16_LE 
> -c2 -r 44100 -vv myfile.wav
> 
> 
> 
> This has answered a question of mine for years as I'm playing with Codec2.
> 
> Low bitrate audio intelligent compression! Only for voice.
> 
> Another suggestion "emcast" (multicast).
> 
> Keep smiling
> 
> Alan VK2ZIW
> 
> On Sun, 5 Apr 2020 18:35:13 -0400, \"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
> 
> 
> ---------------------------------------------------
> Alan Beard
> 
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> 
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>