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