ardour { ["type"] = "dsp", name = "Midi Passthru", category = "Example", license = "MIT", author = "Robin Gareus", email = "robin@gareus.org", site = "http://gareus.org", description = [[An Example Midi Passthrough Plugin using raw buffers.]] } function dsp_ioconfig () return { { audio_in = 0, audio_out = 0}, } end function dsp_has_midi_input () return true end function dsp_has_midi_output () return true end -- "dsp_runmap" uses Ardour's internal processor API, eqivalent to -- 'connect_and_run()". There is no overhead (mapping, translating buffers). -- The lua implementation is responsible to map all the buffers directly. function dsp_runmap (bufs, in_map, out_map, n_samples, offset) -- see http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:ChanMapping local ib = in_map:get (ARDOUR.DataType ("midi"), 0); -- get index of the 1st mapped midi input buffer local ob = in_map:get (ARDOUR.DataType ("midi"), 0); -- get index of the 1st mapped midi output buffer assert (ib ~= ARDOUR.ChanMapping.Invalid); assert (ib == ob); -- require inplace, buffers are identical -- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:MidiBuffer local mb = bufs:get_midi (ib) -- get the mapped buffer events = mb:table () -- copy event list into a lua table -- iterate over all midi events for _,e in pairs (events) do -- e is-a http://manual.ardour.org/lua-scripting/class_reference/#Evoral:MidiEvent --print (e:channel()) end end