radio testing, press to talk hack

[Jim Gettys]

Heh: we have a network transparent window system: the audio should be
network transparent too.  If you google for "Gettys audiofile", you'll
see some interesting sound servers hits.  PulseAudio looks like it may
fill the bill (and AF is very dated and no one ported it to Linux), and
better than the alternatives.

We'd like the kids to be able to run applications on a school server and
have them "just work", sound and all.  And it isn't rocket science.
There's just been many really bad sound servers built over the years:
from what I can tell, PulseAudio is seriously interesting.
                                Regards,
                                       - Jim




On Tue, 2007-03-27 at 15:34 -0700, Brian Cavagnolo wrote:
> On 3/26/07, Jim Gettys <jg at laptop.org> wrote:
> > We've been thinking about switching over to base things on Pulseaudio at
> > some point.
> >
> > Keep us posted.
> 
> Indeed.
> 
> > If it goes well for you, we'll see about interfacing CSound to use it.
> 
> I think that would be pretty straightforward considering how modular
> Pulse Audio is.  Is there any vision for applications that would use
> multicast audio and/or CSound?  The wiki doesn't have much.
> 
> Thanks,
> Brian
> 
> > On Mon, 2007-03-26 at 12:49 -0700, Brian Cavagnolo wrote:
> > > Hello James,
> > >
> > > > I've set up a script that lets me "press to talk" into the microphone
> > > > of a unit and have the sound come out the speakers of all the other
> > > > units in the mesh.  Sort of like how a radio transceiver works.
> > >
> > > I'm working on a similar (okay, practically identical) application.
> > > The target is a mesh network very similar to the OLPC's.  The
> > > implementation depends on Pulse Audio, and is based on the RTP modules
> > > included therewith.  Pulse Audio handles all the mixing, so
> > > simultaneous talkers are supported.  I call the modules the PTT (i.e.,
> > > push-to-talk) modules.  I've posted the source code along with a
> > > README and a simple python script to control it.   The python script
> > > depends on pygtk to paint the push-to-talk button.  You can check it
> > > out at:
> > >
> > > http://www.cozybit.com/projects/pa_ptt/
> > >
> > > So far, I've played with it over two mesh nodes.  Performance is
> > > tolerable.  I expect to refine it over the next few weeks.  Thoughts,
> > > opinions, and patches are welcome.
> > >
> > > Ciao,
> > > Brian
> > > _______________________________________________
> > > Devel mailing list
> > > Devel at laptop.org
> > > http://mailman.laptop.org/mailman/listinfo/devel
> > --
> > Jim Gettys
> > One Laptop Per Child
> >
> >
> >
-- 
Jim Gettys
One Laptop Per Child