[linux-audio-dev] Needing advice on implementing MIDI in my app (RTMix)

[Phil Kerr]

Hi Ivica,

On the website there's a number of applications for Linux  with sourcecode,
mostly in C/C++.  The code examples are released under GPL and other free
licenses.  The documentation covers the protocol reasonably well and I'm in the
middle of updating it now.  The Windows app will have it's sourcecode available
in a few day's (it was only written early this week so we are cleaning the code
of all the *really* hacked up bits).

If your MIDI apps are ALSA 0.9 compatable then you can aconnect them to dmidid
for transmission, reception at the moment passes straight to the MIDI device but
this just needs to be implemented the ALSA way (it's half done in the latest
version of dmidid).  Adding a native DMIDI interface to an existing app can be
fairly easy.  Have a look at the DMIDI'fied SpiralSynth as an example.  You can
have a number of DMIDI clients on a single machine, or have them distributed
over several machines.

All data transmission is done using UDP so yes, it uses TCP/IP.  On a private
LAN latencies and packet loss should not be a problem.  On my LAN at home I've
not had a dropped packet and at work with a very saturated 10mbit segment we've
only had problems when we start scp'ing Debian ISO's around the lab at the same
time.  DMIDI isn't meant for use over the Internet though.

Cheers

Phil

Quoting Ivica Bukvic <ico at fuse.net>:

> Thanks for a quick reply. One more question:
> 
> 1) Is there good documentation to be found, or even better, source code?
> 
> 2) Can I use DMIDI in combination with TCP/IP (I saw you mentioned UDP
> on your site)?
> 
> 3) Does application have to be DMIDI-aware in order to be able to
> send/receive MIDI via DMIDI server or does DMIDI server simply act
> transparently between sender and receiver (if they are presumably on the
> same machine)?
> 
> Again, thanks for your help! Sincerely,
> 
> Ivica Ico Bukvic
> 
> > -----Original Message-----
> > From: Phil Kerr [mailto:philkerr at elec.gla.ac.uk]
> > Sent: Thursday, October 10, 2002 9:49 PM
> > To: Ivica Bukvic
> > Subject: Re: [linux-audio-dev] Needing advice on implementing MIDI in
> my
> > app (RTMix)
> > 
> > Hi Ivica,
> > 
> > DMIDI may be of some use to you.  You can have one DMIDI server and
> your
> > MIDI
> > applications can broadcast DMIDI data.  You use the server to isolate
> you
> > from
> > hardware and MIDI API's
> > 
> > http://www.dmidi.org
> > 
> > Cheers
> > 
> > Phil
> > 
> 
> 
> 



 --   
Phil Kerr                                   Centre for Music Technology   
Researcher                                           Glasgow University  
philkerr at elec.gla.ac.uk                            T (+44) 141 330 5740  
Without music, life would be a mistake.             Friedrich Nietzsche