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ardour { ["type"] = "Snippet", name = "VCA Slave Examples",
license = "MIT",
author = "Ardour Team",
}
function factory () return function ()
-- find possible masters & slave, allow selection in dropdown menu
local targets = {}
local sources = {}
local have_masters = false
local have_slaves = false
for v in Session:vca_manager ():vcas() :iter () do -- for each VCA
sources [v:name ()] = v
have_masters = true
end
for s in Session:get_stripables ():iter () do -- for every track/bus/vca
if s:is_monitor () or s:is_auditioner () then goto nextroute end -- skip special routes
targets [s:name ()] = s
have_slaves = true;
::nextroute::
end
-- bail out if there are no parameters
if not have_slaves then
LuaDialog.Message ("VCA Slave Example", "No Slavables found", LuaDialog.MessageType.Info, LuaDialog.ButtonType.Close):run ()
sources = nil
collectgarbage ()
return
end
if not have_masters then
LuaDialog.Message ("VCA Slave Example", "No VCA masters found", LuaDialog.MessageType.Info, LuaDialog.ButtonType.Close):run ()
targets = nil
collectgarbage ()
return
end
-- create a dialog, ask user which master to assign to which slave
local dialog_options = {
{ type = "dropdown", key = "master", title = "Control Master", values = sources },
{ type = "dropdown", key = "slave", title = "Control Slave", values = targets }
}
local rv = LuaDialog.Dialog ("Select VCA assignment", dialog_options):run ()
targets = nil -- drop references (the table holds shared-pointer references to all strips)
collectgarbage () -- and release the references immediately
if not rv then return end -- user canceled the operation
-- parse user response
local mst = rv["master"]
local slv = rv["slave"]
assert (not slv:to_slavable ():isnil ())
-- test if mst is already controlled by slv (directly or indirectly)
-- if so, don't allow the connection
if (not slv:to_slavable ():assigned_to (Session:vca_manager(), mst)) then
-- if slv is a VCA and is controlled by master, disconnect it
if (not slv:to_vca ():isnil () and slv:to_vca ():slaved_to (mst)) then
slv:to_slavable ():unassign (mst)
else
slv:to_slavable ():assign (mst)
end
else
LuaDialog.Message ("VCA Slave Example", "Recursive VCA assignment ignored", LuaDialog.MessageType.Info, LuaDialog.ButtonType.Close):run ()
end
-- drop references
mst = nil slv = nil
collectgarbage ()
end end
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