[LAU] Routing Audio Around A Network

Ross Vandegrift ross at kallisti.us
Thu Apr 12 10:56:11 EDT 2007


On Thu, Apr 12, 2007 at 10:11:16AM -0400, Jim Eastman wrote:
> A friend of mine is having some issues moving audio around a network.
> Me being not all that good at this stuff myself was at a loss as to
> how to help him. I was hoping somebody here may be able to offer some
> advice.

While I see how netcat would be useful in this situation, I'd strongly
suggest he look into using esd to do it.  esd can listen on a network
socket and it has nice front ends, esdplay and esdcat to direct audio
around various sockets on whatever hosts.

Ross

> 
> Thanks!
> 
> 
> ---------- Forwarded message ----------
> Date: Apr 9, 2007 6:58 PM
> Subject: Linux audio troubles.
> To: vitruvius at notacon.org
> 
> 
> I'm trying to move audio (from radios) between a desktop, which will
> be on the roof, and my laptop, which will be in the consuite.  The
> idea is to take a signal coming in the desktop's mic jack and make it
> come out the laptop's speakers and vice versa.
> 
> A while back, I got this pretty much working (there was a bit of lag)
> with something like
> 
> bunsen at laptop# nc -l -p 4242 > /dev/dsp
> bunsen at desktop# nc -l -p 4243 > /dev/dsp
> bunsen at desktop# nc laptop.example.tld 4242 < /dev/dsp
> bunsen at laptop# nc desktop.example.tld 4243 < /dev/dsp
> 
> That worked with my Thinkpad T41 and an old small form factor K6/2-450
> desktop, both running Ubuntu.  That desktop turned out to have some
> flaky hardware, so I switched to an old, normal-sized Duron 850
> machine running Debian.  Now when I try that, *wierd* shit happens.
> 
> I had the two machines next to each other, network cards wired
> together.  I ran those commands, and started making sounds into the
> laptop's microphone, while listening to headphones plugged into the
> desktop.  I'd hear background noise, then a bit of whatever sound I'd
> recently made near the mic, looped a few times, then back to
> background noise.
> 
> I dunno if this has something to do with configuration, drivers,
> hardware, or waving the dead chicken over the computer in the wrong
> pattern.  If you know how to fix it, or know of a better way to move
> that sound across the network, I'd appreciate the advice.
> 
> Bunsen
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user at lists.linuxaudio.org
> http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-user

-- 
Ross Vandegrift
ross at kallisti.us

"The good Christian should beware of mathematicians, and all those who
make empty prophecies. The danger already exists that the mathematicians
have made a covenant with the devil to darken the spirit and to confine
man in the bonds of Hell."
	--St. Augustine, De Genesi ad Litteram, Book II, xviii, 37



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