Hi Steve! I really like it! Also it opens up a lot of other possibilities in the future like GUI hints, etc.
Richard. On Tue, Jul 16, 2002 at 06:44:59PM +0100, Steve Harris wrote: > OK, I now have a minimal proof of concept for describing LADSPA plugins, > presets and defaults with RDF (http://w3c.org/RDF). > > At this point I'd like to get some feedback so I can decide wether to cut > my losses or finish it (a usable library for hosts would be about another > weeks work, on and off). > > My solution relys on the raptor RDF parser (GPL), which inturn links to > libxml or expat (though only libxml works ATM). An example code fragment > to find the defaults for a plugin, given its UID looks like: > > def_uri = lrdf_get_default_uri(uid); > if (def_uri == NULL) { > printf("(none known)\n"); > return 1; > } > > printf("Defaults for plugin %d: %s\n", uid, > lrdf_get_setting_metadata(def_uri, "title")); > > defs = lrdf_get_setting_values(def_uri); > for (i=0; i < defs->count; i++) { > printf("\tport %d (%s) = %f\n", defs->items[i].pid, > defs->items[i].label, defs->items[i].value); > } > lrdf_free_setting_values(defs); > > giving: > > [swh@dumuzi lrdf]$ ./showdefaults 1416 > Defaults for plugin 1416: Concert A sine (soft) > port 1 (wave) = 1.000000 > port 2 (freq) = 440.000000 > port 3 (warm) = 0.500000 > port 4 (instab) = 0.000000 > > You can see my work in progress at http://plugin.org.uk/lrdf/ , if you're > brave you could try building it, make sure you build raptor with > ./configure --with-xml-parser=libxml > > The bad news is that RDF is pretty verbose, a description of 61 plugins + > thier defaults comes in at 91k (all.rdf). This doesn't include scales, > units, metadata (see sample.rdf) or the type hierachy, but they won't add > much. > > Also in the directory above is a sample plugin description (sample.rdf) > and a sample defaults file (default-sample.rdf). > > Conclusion > > Advantages > > Its a unified way of describing everything* about plugins, it's standards > compliant, extensible, and generally good. > > Disadvantages > > Its not as efficient as a pure XML approach. > > Comments? > > - Steve > > * well... most things -- -- Richard Guenther <[EMAIL PROTECTED]> WWW: http://www.tat.physik.uni-tuebingen.de/~rguenth/ The GLAME Project: http://www.glame.de/
