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livetrax/scripts/midifilter.lua

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ardour {
["type"] = "dsp",
name = "Midi Filter",
category = "Utility",
license = "MIT",
author = "Robin Gareus",
email = "robin@gareus.org",
site = "http://gareus.org",
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