Subject: Re: [linux-audio-dev] It's been more than a year... Have things improved?
From: jacob robbins (jrobbins_AT_newyorkmusicunion.com)
Date: Tue Jul 08 2003 - 01:50:45 EEST
>1- GUI programming, and interface/audio syncronization. As well as I can
>Is it accepted to lock in cases where a destructive operation is being
>performed?
As far as I am concerned it is never acceptable for a regular thread to
lock an rt thread for exactly the reason you mention: priority inversion
deadlock. You forgot to mention one other method for achieving this
communication; System V ipc messages, which i prefer because they don't
lock (if used right) and they are simple. See the man pages for msgget,
msgsnd, msgrcv.
>3-Host instruments. I remember some discussion on XAP a while ago,...
I think that LADSPA plugins can be used as softsynths to good effect.
LADSPA hint # 0x2C0 (LADSPA_HINT_DEFAULT_440) allows for a plugin to be
pitch controlled. This is not as fancy as other plugin api's but it
works and I think we will see more and more use of it. Using a LADSPA
plugin as a softsynth requires a decent amount of work on the part of
the host: each LADSPA plugin instance is only one voice and polyphony
must be handled by the host. However, there are now hosts out there that
have the framework to handle this.
>4-Interface abstraction for plugins.: We all know how our lovely X11..
>Steve Harris proposed the use of (rdf was it?),
Steve Harris' lib-rdf is available:
http://plugin.org.uk//lrdf/
but i have not used it and can not say anything useful about it. It is
used by ardour though.
-jacob robbins.....
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