ardour { ["type"] = "dsp", name = "Midi Filter", category = "Example", -- "Utility" license = "MIT", author = "Ardour Lua Task Force", description = [[An Example Midi Filter for prototyping.]] } 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 function dsp_run (_, _, n_samples) assert (type(midiin) == "table") assert (type(midiout) == "table") local cnt = 1; function tx_midi (time, data) midiout[cnt] = {} midiout[cnt]["time"] = time; midiout[cnt]["data"] = data; cnt = cnt + 1; end -- for each incoming midi event for _,b in pairs (midiin) do local t = b["time"] -- t = [ 1 .. n_samples ] local d = b["data"] -- get midi-event if (#d == 3 and bit32.band (d[1], 240) == 144) then -- note on tx_midi (t, d) end if (#d == 3 and bit32.band (d[1], 240) == 128) then -- note off tx_midi (t, d) end end end