Mark Morgan Lloyd wrote:
leledumbo wrote:
http://sourceforge.net/projects/fpalsa/
http://sourceforge.net/projects/humus/
Thanks for those. Also
http://perso.wanadoo.es/plcl/alsapas/alsapas-en.html so as I thought
there appears to be (at least) two sets of ALSA bindings: fpalsa and
alsapas.
Noted HuMuS, but that appears to be for PortAudio. However using that as
a seed I get to http://breakoutbox.de/pascal/pascal.html#PortAudio which
claims to include PortMidi support- this is supposedly cross-platform
but requires an additional library which might not be available on all
distreaux. Also MIDI is very much the "poor cousin" and operating
support is patchy, so since I've got ALSA working I'm reluctant to risk
breaking anything.
Since running on anything other than Linux is not a significant
priority, I think I'll probably start off with by doing a comparison of
fpalsa and alsapas, and writing code that will support either if
possible. If I could also code to support PortMidi that would be a
bonus, but by no means essential: I'm trying to knock together a MIDI
transposer for my own use, and testbed some techniques for another project.
To wrap this up, alsapas is a translation of the ALSA headers etc. as of
v0.9.7, and fpalsa is similar but corresponds to the slightly later
v1.0.24. They have a slightly different style in that alsapas uses
variable parameters while fpalsa uses pointers to be a bit closer to the
original (and possibly to allow null parameters); alsapas is attractive
in that it's got useful examples.
As far as MIDI is concerned, alsapas still works but there's a handful
of parameters named "out" that are no longer compatible with FPC, I've
followed the author's convention and renamed those to _out; basic
operation appears OK on Debian "Squeeze" x86 with a 3.2 kernel.
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
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