[linux-audio-dev] Audio synchronization, MIDI API

John Check j4strngs at bitless.net
Tue Aug 17 06:26:28 EDT 2004


On Tuesday 17 August 2004 03:48 am, Phil Kerr wrote:
> Thanks John,
>
> The mouse problem is caused by the kernel missing usbmouse, as I didn't
> have one to test it when I built the kernel (got one now so the next
> build should be ok).
>
> It's great news that it's working with Nvidia cards, this is a mixture
> of X.org's X11R6.7.0 and Jennifer Dillon's modeline XF86Config.
>
> Testing reports are always welcomed as getting feedback on how things
> work on different hardware configs is the best way to shake the bugs
> out.
>

I expect to be subscribing to your lists shortly.

> Regards
>
> Phil
>
> On Tuesday, August 17, 2004, at 12:19  am, John Check wrote:
> > On Sunday 15 August 2004 05:48 am, phil at plus24.com wrote:
> >> The current top Ethernet standard specifies max transmission speed of
> >> 10GBit/sec - 1394b is 800MBit/sec.
> >>
> >> You can also run Ethernet over Firewire.  IIRC the max. number of
> >> devices on a 1394 chain is 63 making Ethernet more suitable for large
> >> clusters of interconnected MIDI workstations.
> >>
> >> But to an extent arguing over which PHY layer is like a Vi / Emacs
> >> flamewar.
> >>
> >> [plug]
> >>
> >> For a working example of a MIDI over Ethernet (and UDP) have a look at
> >> IEEE P1639 (was called DMIDI):
> >>
> >> www.plus24.com/ieeep1639
> >>
> >> This acts as a bridge between ALSA and the network so all MIDI apps
> >> can
> >> bounce MIDI data between remote machines without any code changes.
> >>
> >> I'm also working on an embedded Linux for clustering audio
> >> workstations,
> >> Live CD available (USB mouse support broken just for now, PS/2 OK):
> >>
> >> www/plus24.com/m-dist
> >>
> >> This is also a call for participation in the final development of the
> >> standard as well as application development.
> >
> > I gave m-dist a whirl this afternoon and you my friend, are on the
> > right
> > track. I may be able to help with testing.
> > For some reason, my USB mouse wasn't autodetected (passing the
> > autoprobe
> > option seemed to help) but it locked up once I got a desktop.
> > I was impressed that it booted into X because I have an Nvidia card
> > and thats
> > always a hassle.
> >
> >> Regards
> >>
> >> Phil
> >>
> >>
> >> On Sunday, August 15, 2004, at 09:36  am, Steve Harris wrote:
> >>
> >> But if youre going to do that, why use ethernet? You'd need dedicated
> >> NICs
> >> and switches, so you may as well use firewire, which has dedicated
> >> realtime channels, more bandwidth and doesnt require switching. 400meg
> >> Firewire cards are down to about 7 or 8 euros in the UK now.
> >>
> >> The only disadvantage is that you can't (right now) cheaply run
> >> firewire
> >> over long distances, but taht will change once firewire over CAT5
> >> cards
> >> come down in price, and this is rarely an issue with clusters anyway.


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