[pulseaudio-discuss] Controlling where module-rtp-send sends multicast packets?

[Jon Smirl]

On 2/20/08, Matt Patterson <matt at v8zman.com> wrote:
> How do you join rooms together dynamically? That is one of my primary requirements. It sounds like you have gone almost the exact same route as me.

They sell a $350 box for picking the source for each zone.
http://www.htd.com/s.nl/it.A/id.631/.f?sc=12&category=3658

I have my six rooms divided into four zones. I just change the play
list on mpd for the zone to change what it is playing. You can alter
the zone arrangement but it requires flipping switches on the amp
since I don't have a zone controller.

I'm not adding to my existing multiroom setup anymore now that we have
started work on Digispeaker. Digispeaker uses power line networking.
It also has an SD card slot. You copy your play list on the SD cards.
The nodes copy the songs into each other at 80Mb/sec before starting
to play. You just have to keep the clocks tightly synchronized and all
of the zones will stay synchronized by starting the play of each song
at a synchronized instant. The clock drift that occurs while a song is
playing never exceeds a audio sample period. Digispeaker is designed
to not need a central server (optional) or central wiring. It is very
easy to install into retro fit houses - cut a hole in the ceiling,
stick head in, locate some AC, install two speakers and you're done.

Digispeaker has far better THD number than traditional multiroom
systems since the 500ft cable runs are eliminated. The speakers are
digitally bi-amped and the DSP compensates for their flaws. It an open
source project, we should have the first round of hardware ready in a
couple of months.

>
>  Matt
>
>
>
>  -----Original Message-----
>  From: Jon Smirl <jonsmirl at gmail.com>
>  Sent: Wednesday, February 20, 2008 12:53 PM
>  To: General PulseAudio Discussion <pulseaudio-discuss at mail.0pointer.de>
>  Subject: Re: [pulseaudio-discuss] Controlling where module-rtp-send sends       multicast packets?
>
>
> On 2/20/08, Paul Fox <pgf at foxharp.boston.ma.us> wrote:
>  > matt wrote:
>  >  > In an effort to use more of the pc that I already have running
>  >  > 24 7 I have opted to keep the amps right next to the pc and
>  >  > run speaker wiring throughout the house.  Thus I have no need
>  >  > for remote nodes throughout the house.  All remote contrl will
>  >  > be done via web tablets in the rooms.
>  >
>  > i see.  that makes sense.
>  >
>  > well, i'm _not_ an audio nut :-), and my audio setup takes advantage of
>  > the thin clients already running 24/7 in various rooms of the house.
>  > so somewhat different design criteria, but the logical architecture
>  > of what we're doing ends up being pretty similar.
>
>  This is a very cost effective setup:
>  http://www.htd.com/amplifiers/12-Channel-Amplifier
>  Provides six rooms of stereo amps $649
>  NSLU as music source $80
>  USB disk $100
>  USB 1.0 hub and 4 USB audio cards $100 (USB 2.0 hub must be multi-TT)
>  I run four copies of mpd on the NSLU2.
>
>  Existing Nokia N800 with mpd client for remote control.
>
>  This setup has some drawbacks but it is very cost effective at
>  $150/room plus speakers.
>
>  My house had speakers with volume controls in each room installed by
>  the previous owner.
>
>  30W/channel amps are plenty for background music. HTD sells
>  60W/channel but you won't need it.
>
>
>  >
>  >  > I am also a bit of an audio nut and have not had a chance to
>  >  > listen carefully to the audio produced by this soution.  If
>  >  > pulse fails I can always build/buy a hardware audio matrix
>  >  > switch and put it with the amps.
>  >
>  > once you have it all working, don't forget all the other uses for
>  > whole-house digital audio -- caller-id announcement, on demand
>  > text-to-speech weather forecasts, custom wakeup alarms.  i even
>  > have some scripts that help with exercise and stretching routines --
>  > i hate counting sets and repeats for myself, so i think of the
>  > computer as my personal robotic trainer.  :-)
>  >
>  > paul
>  > =---------------------
>  >  paul fox, pgf at foxharp.boston.ma.us (arlington, ma, where it's 25.2 degrees)
>  > _______________________________________________
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>  >
>
>
>  --
>  Jon Smirl
>  jonsmirl at gmail.com
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-- 
Jon Smirl
jonsmirl at gmail.com