13
0
livetrax/share/scripts/s_fader_automation.lua

59 lines
1.6 KiB
Lua
Raw Normal View History

2016-04-11 08:36:57 -04:00
ardour { ["type"] = "Snippet", name = "Fader Automation" }
2016-04-10 14:57:24 -04:00
function factory () return function ()
local playhead = Session:transport_sample ()
local samplerate = Session:nominal_sample_rate ()
2016-04-10 14:57:24 -04:00
-- get selected tracks
2016-04-11 08:36:57 -04:00
rl = Editor:get_selection ().tracks:routelist ()
2016-04-10 14:57:24 -04:00
-- prepare undo operation
Session:begin_reversible_command ("Fancy Fade Out")
local add_undo = false -- keep track if something has changed
2016-04-11 08:36:57 -04:00
-- 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)
2016-04-10 14:57:24 -04:00
2016-04-11 08:36:57 -04:00
-- set automation state to "Touch"
ac:set_automation_state (ARDOUR.AutoState.Touch)
2016-04-10 14:57:24 -04:00
-- query the value at the playhead position
local g = al:eval (playhead)
2016-04-10 14:57:24 -04:00
-- get state for undo
2016-04-11 08:36:57 -04:00
local before = al:get_state ()
2016-04-10 14:57:24 -04:00
-- delete all events after the playhead...
al:truncate_end (playhead)
2016-04-11 08:36:57 -04:00
2016-04-10 14:57:24 -04:00
-- ...and generate some new ones.
for i=0,50 do
2016-04-11 08:36:57 -04:00
-- use a sqrt fade-out (the shape is recognizable, and otherwise
-- not be possible to achieve with existing ardour fade shapes)
al:add (playhead + i * samplerate / 50,
2016-04-11 08:36:57 -04:00
g * (1 - math.sqrt (i / 50)),
false, true)
2016-04-10 14:57:24 -04:00
end
2016-04-11 08:36:57 -04:00
2016-04-10 14:57:24 -04:00
-- remove dense events
al:thin (20)
2016-04-10 14:57:24 -04:00
-- save undo
2016-04-11 08:36:57 -04:00
local after = al:get_state ()
Session:add_command (al:memento_command (before, after))
2016-04-10 14:57:24 -04:00
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
2016-04-10 14:57:24 -04:00
Session:commit_reversible_command (nil)
else
Session:abort_reversible_command ()
end
end end