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livetrax/share/scripts/s_region_gain_curve.lua

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ardour { ["type"] = "Snippet", name = "Set Region Gain Curve" }
function factory () return function ()
-- get Editor GUI Selection
-- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:Selection
local sel = Editor:get_selection ()
-- prepare undo operation
Session:begin_reversible_command ("Lua Region Gain Curve")
-- iterate over selected regions
-- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:RegionSelection
for r in sel.regions:regionlist ():iter () do
-- test if it's an audio region
local ar = r:to_audioregion ();
if ar:isnil () then
goto next
end
-- get region-gain-curve is-a
-- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:AutomationList
local al = ar:envelope ()
-- get state for undo
local before = al:get_state ()
-- delete all current events
al:clear_list ()
-- add some new ones
for i=0,50 do
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al:add (r:length ():scale (Temporal:ratio (i, 50)),
1 - math.sqrt (i / 50),
false, true)
end
-- remove dense events
al:thin (20)
-- save undo
local after = al:get_state ()
Session:add_command (al:memento_command (before, after))
::next::
end
if not Session:abort_empty_reversible_command () then
Session:commit_reversible_command (nil)
end
end end