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update and cleanup lua example scripts

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This commit is contained in:
Robin Gareus 2016-04-11 14:36:57 +02:00
parent d21f202905
commit baf6319613
6 changed files with 101 additions and 43 deletions
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39
scripts/s_fader_automation.lua
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@ -1,46 +1,53 @@
ardour { ["type"] = "Snippet", name = "fader automation" }
ardour { ["type"] = "Snippet", name = "Fader Automation" }
function factory () return function ()
local playhead = Session:transport_frame ()
local samplerate = Session:nominal_frame_rate ()
-- get selected tracks
rl = Editor:get_selection().tracks:routelist()
rl = Editor:get_selection ().tracks:routelist ()
-- prepare undo operation
Session:begin_reversible_command ("Fancy Fade Out")
local add_undo = false -- keep track if something has changed
-- iterate over selected tracks
for r in rl:iter() do
local ac = r:amp():gain_control() -- ARDOUR:AutomationControl
local acl = ac:alist() -- ARDOUR:AutomationControlList (state, high-level)
local cl = acl:list() -- Evoral:ControlList (actual events)
for r in rl:iter () do
local ac = r:amp ():gain_control () -- ARDOUR:AutomationControl
local al = ac:alist () -- ARDOUR:AutomationList (state, high-level)
local cl = al:list () -- Evoral:ControlList (actual events)
ac:set_automation_state(ARDOUR.AutoState.Touch)
if cl:isnil() then
if cl:isnil () then
goto out
end
-- set automation state to "Touch"
ac:set_automation_state (ARDOUR.AutoState.Touch)
-- query the value at the playhead position
local g = cl:eval(playhead)
local g = cl:eval (playhead)
-- get state for undo
local before = acl:get_state()
local before = al:get_state ()
-- delete all events after the playhead...
cl:truncate_end (playhead)
-- ...and generate some new ones.
for i=0,50 do
-- use a sqrt fade-out (the shape is recognizable, and otherwise
-- not be possible to achieve with existing ardour fade shapes)
cl:add (playhead + i * samplerate / 50,
g * (1 - math.sqrt (i / 50)),
false, true)
g * (1 - math.sqrt (i / 50)),
false, true)
end
-- remove dense events
cl:thin(20)
cl:thin (20)
-- save undo
local after = acl:get_state()
Session:add_command (acl:memento_command(before, after))
local after = al:get_state ()
Session:add_command (al:memento_command (before, after))
add_undo = true
::out::