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livetrax/share/scripts/s_fader_automation.lua

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