Subject: [linux-audio-dev] LADSPA presets (again)
From: Taybin Rutkin (trutkin_AT_physics.clarku.edu)
Date: Sun Dec 02 2001 - 03:09:30 EET
On Fri, 30 Nov 2001, Lance Blisters wrote:
> an xml fragment. the Ladspa-Plugin-Settings
> is a named collection of port values for
> one or more plugins. we also use
> Ladspa-Plugin-Settings for the root node.
>
> <!-- various numbered presets for one ladspa filter. />
>
> <Ladspa-Plugin-Settings>
> <Ladspa-Plugin-Settings preset_name="0">
> <Plugin plugin_id="1186" name="Audio divider (suboctave generator)">
> <Control-Port index="0" name="Denominator" value="3.000000"/>
> </Plugin>
> </Ladspa-Plugin-Settings>
> <Ladspa-Plugin-Settings preset_name="1">
> <Plugin plugin_id="1186" name="Audio divider (suboctave generator)">
> <Control-Port index="0" name="Denominator" value="4.000000"/>
> </Plugin>
> </Ladspa-Plugin-Settings>
This is pretty much the same as the Ardour one except for a couple things.
One, the name of the control-port isn't saved; we can just ask the LADSPA
plugin for its value. Two, each preset goes in its own file. I think
this is important because it simplifes adding new presets that aren't
created internally. All the presets for a given plugin are in the same
directory which has the plugin_id as its name. The name of the preset is
the name of file plus ".xml". So for your example above, the equivilant
for Ardour would be:
<Ladspa-Plugin plugin_id="1186" name="Audio divider (suboctave
generator)">
<Control-Port index="0" name="Denominator" value="3.000000"/>
</Ladspa-Plugin>
The file would be saved as $LADSPA_PRESET/1186/denominator\ three.xml.
I left the names in because it helps with editing the file by hand. The
plugin_id should be in the header so that someone can look at the file and
know what plugin it is a preset for. The name I chose for the file is
meaningless and is assigned by the user.
I also think that there should be two or more directories in
$LADSPA_PRESET. Maybe a /usr/share/ladspa/preset/,
/usr/local/share/ladspa/preset/, and one for the users home directory.
I'm not sure how that would be defined.
Obviously, this doesn't support networks. But I think it shouldn't. That
should be defined in a different file. This is only for defining presets
for one level in the sound chain.
Comments?
Taybin
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