[alsa-devel] How to get correct midi timings from ALSA using the library only
cladisch at fastmail.net
Tue Jul 24 12:24:15 CEST 2007
Carlo Florendo wrote:
> (1) I've written a command line MIDI sequencer for lightweight systems and
> am successful in making it work using the ALSA queue API. However, one
> drawback of the API is its lack of callback functions. I wish to be able
> to track events as they are drained by the queue.
> (2) I know and have successfully worked on a work around whereby the
> application itself subscribes to the output port so as to see events as
> they are played.
You could also send special user-defined events just to yourself, but
the principle is the same.
> However, I wish to be able to make the sequencer or player work without the
> use of the ALSA queue nor the workaround in (2).
> How could I get the app to <u|nano>sleep() in the most accurate way in
> userspace without using the ALSA queue nor the extra subscription to an
> output port?
On newer kernels, you could try POSIX interval timers.
> Or, is there a drain or output routine that supports callbacks?
Why can't you simply call the callback when some event has been
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