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livetrax/share/scripts/_midi_rec_start.lua

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ardour {
["type"] = "session",
name = "MIDI Record Enable",
category = "Example", -- "Utility"
license = "MIT",
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author = "Ardour Team",
description = [[An example script to start recording on note-on.]]
}
function factory ()
return function (n_samples)
if Session:actively_recording() then return end -- when recording already, do nothing
-- iterate over all MIDI ports
_, t = Session:engine ():get_ports (ARDOUR.DataType.midi (), ARDOUR.PortList ())
for p in t[2]:iter () do
-- skip output ports
if not p:receives_input () then goto next end
local midiport = p:to_midiport ()
-- and skip async event ports
if midiport:isnil () then goto next end
local mb = midiport:get_midi_buffer (n_samples) -- get the midi-data buffers
local events = mb:table () -- copy event list into lua table
for _,e in pairs (events) do -- iterate over all events in the midi-buffer
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if (e:buffer():array()[1] & 0xf0) == 0x90 then -- note on
Session:maybe_enable_record (true) -- global record-enable from rt-context
-- maybe-enable may fail if there are no tracks or step-entry is active
-- roll transport if record-enable suceeded:
if ARDOUR.Session.RecordState.Enabled == Session:record_status() then
Session:request_transport_speed (1.0, true, ARDOUR.TransportRequestSource.TRS_UI) -- ...and go.
end
return
end
end
::next::
end
end
end