[LAD] Finding ALSA sequencer client/port numbers

Lieven Moors lievenmoors at gmail.com
Fri Apr 22 23:18:55 UTC 2011


On Fri, Apr 22, 2011 at 07:09:24PM -0400, Paul Davis wrote:
> On Fri, Apr 22, 2011 at 7:05 PM, Lieven Moors <lievenmoors at gmail.com> wrote:
> 
> > I had a similar problem in my studio when I wanted to restore
> > connections with multiple ZynaddsubFX instances. All the port names
> > were the same, so I had no way of knowing which was which.
> > And the client ID is not much help either, because it completely
> > depends on the order in which you start the applications.
> > In the end, the only thing I could do was patch ZynaddsubFX so
> > it would make unique port names. It was very hard to code such
> > a simple thing, because like you, I couldn't find a way to get
> > an id from a name...
> 
> why would you use the name at all. the way we handle this in ardour2
> is to use only port IDs when storing MIDI connections. the names are
> not used at all. we use pair<int,int> as SequencerPortAddress (the
> first one is the client ID, the second is the port ID).
> 
> --p

But surely, the client IDs are a moving target. I want to connect
to a specific instance of ZynaddsubFX, not to the program that was
the second one to get an ALSA ID...

Am I missing something?

lieven



More information about the Linux-audio-dev mailing list