Re: ALSA kernel sequencer client

[Lee Revell <rlrevell@joe-job.com>]

On Mon, 2006-07-24 at 13:18 +0200, Clemens Ladisch wrote:
> Lee Revell wrote:
> > I'm developing a driver for a device that's like an MPU output port, but
> > some extra hardware registers need to be written to when note on/off
> > messages arrive.  Since the MIDI stream must be interpreted and hardware
> > needs to be accessed directly I think I need to develop an ALSA
> > sequencer kernel client.
> 
> Currently, a sequencer client is only used for devices where all MIDI
> messages must be interpreted by the driver and where the device doesn't
> ever see them.  The USB MIDI and serial MIDI drivers do their own
> parsing.
> 
> This doesn't mean that you shouldn't use a sequencer client.
> 

I think I'm going to use a rawmidi device and snoop the MIDI stream for
note on/note off.  It does not look too hard, and unlike the sequencer
is documented.

> > I remember seeing some docs for developing this kind of thing,
> 
> I'm sure there never were such docs.
> 
> > but can't find them - can someone point me in the right direction?
> 
> Use the Source, Luke^H^H^Hee: the USB MIDI driver was a sequencer client
> before October 2002.

Thanks for the info.

Lee


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