[linux-audio-dev] LV2 plugin porting experience

I thought it might be of interest to other plugin developers to learn what my experiences were of porting my LADSPA plugins to the LV2 draft. As some of you may know the primary source for my plugins is a wierd XML format, so porting that was fiddly, but didn't involve much manual effort, "just" coding a handful of XSLT sheets. However I ported a couple by hand to get a feel for it, and basically it comes down to deleting the constants and runAdding method from the ladspa .c file, sedding some struct names and replacing occurances of LADSPA_Data with float (except the last argument to connectPort, which is a void *). It may be possible to do it automatically with a cpp/m4 hack, or a perl script or something, but I doubt its worth the effort. Writing the turtle is a little more involved, but I'm sure some enterprising person can write a program to generate .ttl from existing LADSPA .so's, then it will be a case of adding any additional data you want to express by hand. Writing the Makefile was pretty tricky, as the plugin data and code all ends up in a plugin directory, but it wasn't too bad once I figured out how best to layout the source. I decided not to use automake/autoonf/ ibtool as I felt it caused more probems than it solved with LADSPA. The Makefile would have been less critical if I didn't have quite so many plugins; I didn't want to recurse into every plugin directory, which is the obvious thing to do. - Steve