Re: LV2 Plugin Support

Hi,

On Wed, 10 Aug 2011, Jeremy Salwen wrote:

> 2. MIDI ports on LV2 plugins

and now the MIDI part:

> As for MIDI ports, I don't know if there is infrastructure in place for 
> plugins to handle MIDI or other events with Chain effects.  I could look 
> to the LADSPA plugin support for examples of handling audio and control 
> ports, but I'm not sure where to look for for an example of how to 
> implement MIDI, if at all possible.  To make matters complicated, it

This is indeed a more complicated task as there is much less MIDI infra in 
the existing code base.

So I think it might be easiest to start the MIDI support from some 
specific, limited use case and extend from there. In principle, the 
midi-server.h offers a simple handler interface (with just one method for 
feeding read MIDI bytes to the handlers). A LV2 plugin taking MIDI as 
input, could register via midi-server.h as a handler and feed the MIDI 
bytes to the LV2 plugin. This works with both rawmidi and ALSA sequencer 
interface (and if JACK MIDI support is added, it will then work 
transparently with that as well).

Another alternative is to just extend the midi-server.h interface to suite 
needs for LV2 MIDI support. midi-cc.cpp (-km implementation) is a good 
example of this approach (it uses MIDI_SERVER::add_controller_trace() and 
MIDI_SERVER::last_controller_value().

But yeah, some prototyping might be in order to figure out the easiest and 
sanest approach.

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