Re: [LAD] Re : Saving plugin presets

Sylvain HENRY schrieb:
>
>
>
> ----- Message d'origine ----
>> De : MarcO'Chapeau <marco@email-addr-hidden>
>> À : linux-audio-dev@email-addr-hidden
>> Envoyé le : Mercredi, 21 Janvier 2009, 16h04mn 47s
>> Objet : Re: [LAD] Saving plugin presets
>>
>> Luis Garrido schrieb:
>>> To be utterly pragmatic, I think at this moment the best approach for
>>> this problem would be an evolutionary one.
>>>
>>> Just implement whatever format you feel like and see if it takes. No
>>> one is going to sue you, although you are guaranteed to get your fair
>>> share of critics, no matter what.
>>>
>>> At the worst case, this particular situation is so utterly simple that
>>> it should be trivial to convert one format to another if the need
>>> arises.
>>>
>>> If it helps in the end I chose for my project INI files just because
>>> it was a Qt app and Qt provides a nifty INI parser (QSettings) with
>>> some merging capabilities (concurrent Qt processes can make changes
>>> without corrupting the file and those are easily synchronized.) But
>>> that was me just being lazy, I guess.
>> In fact, being lazy can be good. INI files nearly use a YAML syntax which
>> is also very easy to parse with C, C++, python and perl.
>
> Maybe you could use libconfig?
> http://www.hyperrealm.com/libconfig/
>
> It is really easy to use (no parsing, no type casting) and configuration files can have a very well structured syntax (array, list, comments...).
>
> Moreover you can use it directly from C or C++.

Seems to be a nice library, but it looks already too capable for the task at
hand. The idea is to agree on a simple format, so that we don't add a hidden
dependency for a certain library to parse it. Therefore no xml, rdf etc..

Take ladspa/aw.so
>analyseplugin /usr/lib/ladspa/aw.so | grep "control,"
Ports: "Frequency (Hz)" input, control, 0 to ...
        "Feedback" input, control, 0 to 1
        "Delay (samples)" input, control, 5 to 50, integer

So the preset could look like:
[ladspa preset]
plugin=alienwah_mono
preset="Angry Alien"

[parameters]
"Frequency (Hz)"=100
"Feedback"=0.7
"Delay (samples)"=40

Using the names as keys looks ugly, we could agree on using the port-numbers too.

Like Luis suggested the files could reside in:
Global: /usr/share/ladspa/presets/alienwah_mono/angry_alien.ini
Local: ~/.ladspa/presets/alienwah_mono/angry_alien.ini
or to go with xdg-user-dir spec (not clutter the homedirs even more)
Local: ~/.config/ladspa/presets/alienwah_mono/angry_alien.ini

Anything missing? Everyone agrees? How do we get it added to ladspa.h as a big
comment blob :)

ciao
Stefan

>
> Cheers,
> Sylvain
>
>> -- Marc-Olivier Barre --
>> --- MarcO'Chapeau ----
>> - www.marcochapeau.org -
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Received on Thu Jan 22 00:15:02 2009