5 Jul
2010
5 Jul
'10
5:16 a.m.
On Sun, Jul 4, 2010 at 5:16 PM, Dan Mills <dmills(a)exponent.myzen.co.uk> wrote:
This sort of issue is what the ALSA midi sequencer is
really intended to
fix, by making midi timing a kernel problem rather then a user space
one.
the mistake there is that it makes the once-reasonable assumption that
the required timing could only be accomplished in the kernel. this was
once true, but its not anymore.
It sort of solves HALF the problem, in that it makes
getting midi
messages out on time more or less possible (at least on paper), but it
does nothing for reliably timestamping incoming midi using a clock that
can be related simply to the audio sample clock and which would thus be
useful when building software synths.
IIRC, you can set the clock source on an ALSA sequence queue to be the
clock based on a PCM device.