Steven,
In addition to PortMidi, there is a PortSMF -- port standard midi
file -- in a parallel directory on sourceforge (under SVN, see the
PortMedia wiki on sourceforge for more info).
There's not much documentation yet, but you can use it to write midi
files in two steps. First, you need to build an in-memory sequence (an
instance of Alg_seq). It is possible to put in a tempo track, track
names and info, key signatures, etc., but you can also just put in
pitch, time, duration, and loudness. Then you can call a function to
write your sequence to a midi file (or an ascii representation is also
available).
If you go this route and need more details, let me know.
-Roger
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