64 lines
1.7 KiB
Lua
64 lines
1.7 KiB
Lua
ardour { ["type"] = "Snippet", name = "Fader Automation" }
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function factory () return function ()
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local playhead = Session:transport_frame ()
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local samplerate = Session:nominal_frame_rate ()
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-- get selected tracks
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rl = Editor:get_selection ().tracks:routelist ()
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-- prepare undo operation
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Session:begin_reversible_command ("Fancy Fade Out")
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local add_undo = false -- keep track if something has changed
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-- iterate over selected tracks
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for r in rl:iter () do
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local ac = r:amp ():gain_control () -- ARDOUR:AutomationControl
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local al = ac:alist () -- ARDOUR:AutomationList (state, high-level)
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local cl = al:list () -- Evoral:ControlList (actual events)
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if cl:isnil () then
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goto out
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end
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-- set automation state to "Touch"
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ac:set_automation_state (ARDOUR.AutoState.Touch)
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-- query the value at the playhead position
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local g = cl:eval (playhead)
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-- get state for undo
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local before = al:get_state ()
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-- delete all events after the playhead...
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cl:truncate_end (playhead)
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-- ...and generate some new ones.
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for i=0,50 do
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-- use a sqrt fade-out (the shape is recognizable, and otherwise
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-- not be possible to achieve with existing ardour fade shapes)
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cl:add (playhead + i * samplerate / 50,
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g * (1 - math.sqrt (i / 50)),
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false, true)
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end
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-- remove dense events
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cl:thin (20)
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-- save undo
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local after = al:get_state ()
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Session:add_command (al:memento_command (before, after))
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add_undo = true
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::out::
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end
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-- all done, commit the combined Undo Operation
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if add_undo then
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-- the 'nil' Commend here mean to use the collected diffs added above
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Session:commit_reversible_command (nil)
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else
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Session:abort_reversible_command ()
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end
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end end
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