On Tue, 2006-07-25 at 01:19 +0200, Jens M Andreasen wrote: > On Mon, 2006-07-24 at 17:55 -0400, Lee Revell wrote: > > > Ugh. All I need to do is snoop note on, note off, and the note number. > > But you're saying that 0x81 is sometimes part of a timestamp, and other > > times it means note off on channel 1? > > > > So you are saying my driver needs to have full knowledge of the MIDI > > state machine in order to snoop note on and note off? > > > Driver? This is a driver for a midi-port on a sound-card or a some kind > of midi-file player?
It's similar to a driver for a MIDI port on a sound card, except the driver additionally has to respond to note on and note off by twiddling some other bits in the hardware. It's equivalent to having to flash an LED for note on and another for note off. I wrote the driver as an ALSA rawmidi device, which was probably not the best idea - I did not realize at the time that I would have to interpret the MIDI stream. An ALSA kernel sequencer client would have been more appropriate. I think I can get away with always treating 0x90 as note on and 0x80 as note off regardless of the context. (I can't release source or give the hardware details now, as the hardware is still being developed) Lee
