[linux-audio-user] Information on using LADSPA plugins

[Paul Berry]

Greetings all:

I am trying to learn about the LADSPA plugins. I have downloaded and
installed the ladspa_sdk, read the ladspa.h header file and read Dave
Phillips article on the O'Reilly network. I've also added the CMT plugin
library.

Okay, so I've got my plugins but I need some helping making them go. I don't
really understand how they work. I am trying to learn about them in a
console environment, that is to say just by themselves (if that is possible,
maybe that is part of the difficulty). I understand the basics of the C
language and the Linux operating system but most of the information I have
found seems to cover developing plugins and consequently goes right over my
head.

Lets say I wanted to use the sine.so plugin from the sample library to play
a continuos pitch from my sound card, how would I do that? I'm confused by
the need of an input file for this as I see the sine.so plugin as the
source. Can the output file be a dev file? How about using the ALSA hw
plugin hw:0,0 as the output, how would I do that? I've read the ALSA library
documentation about plugins and LADSPA but again it goes right over my head.

Anyway, I though I'd ask these questions to this list and see what came of
it. I'm using recent ALSA drivers, with a 2.2.20 kernel on a very old
computer (hence the desire to learn about the plugins from the console).

Thank you in advance for any consideration and advice.

Sincerely,
Paul