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ardour { ["type"] = "Snippet", name = "plugin automation2" }
function factory () return function ()
local playhead = Session:transport_frame ()
local samplerate = Session:nominal_frame_rate ()
local r = Session:route_by_remote_id(3)
-- get AutomationControList, ControlList and ParameterDescriptor
local acl, cl, pd = ARDOUR.LuaAPI.plugin_automation (r:nth_plugin (0), 0)
if not acl:isnil() then
print ("Parameter Range", pd.lower, pd.upper)
print ("Current value", cl:eval(playhead))
-- prepare undo operation
Session:begin_reversible_command ("Automatix")
local before = acl:get_state()
-- remove future automation
cl:truncate_end (playhead)
-- add new data points after the playhead 1 sec min..max
-- without guard-points, but with initial (..., false, true)
for i=0,10 do
cl:add (playhead + i * samplerate / 10,
pd.lower + math.sqrt (i / 10) * (pd.upper - pd.lower),
false, true)
end
-- save undo
local after = acl:get_state()
Session:add_command (acl:memento_command(before, after))
Session:commit_reversible_command (nil)
end
end end
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