[arm-allstar] simultaneous asterisk and direwolf possible?

[Al Beard]

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
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> 
> Visit the BBB and RPi2/3/4 web page - http://hamvoip.org


---------------------------------------------------
Alan Beard

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