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ardour { ["type"] = "Snippet", name = "MIDI CC to Plugin Automation" }
function factory () return function ()
-- target automation lane: a plugin parameter on a track
local tgt = Session:route_by_name('Audio') -- get track
assert (not tgt:isnil ())
-- get AutomationList, ControlList and ParameterDescriptor
-- of the first plugin's 2nd parameter
local al, _, pd = ARDOUR.LuaAPI.plugin_automation (tgt:nth_plugin (0), 1)
-- Source MIDI CC parameter
local midi_channel = 0 -- 0..15
local cc_param = 0x56
local add_undo = false
Session:begin_reversible_command ("CC to Automation")
local before = al:get_state()
al:clear_list ()
-- for all selected MIDI regions
local sel = Editor:get_selection ()
for r in sel.regions:regionlist ():iter () do
local mr = r:to_midiregion ()
if mr:isnil () then goto next end
local bfc = ARDOUR.DoubleBeatsFramesConverter (Session:tempo_map (), r:position ())
local ec = mr:control (Evoral.Parameter (ARDOUR.AutomationType.MidiCCAutomation, midi_channel, cc_param), false)
if ec:isnil () then goto next end
if ec:list ():events ():size() == 0 then goto next end
for av in ec:list ():events ():iter () do
local val = pd.lower + (pd.upper - pd.lower) * av.value / 127
al:add (bfc:to (av.when), val, false, true)
add_undo = true
end
::next::
end
-- save undo
if add_undo then
local after = al:get_state()
Session:add_command (al:memento_command(before, after))
Session:commit_reversible_command (nil)
else
Session:abort_reversible_command ()
end
end end
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