livetrax/scripts/_store_recall_mixer.lua

ardour {
	["type"] = "EditorAction",
	name = "Mixer Store",
	author = "Ardour Lua Taskforce",
	description = [[Stores the current Mixer state as a file that can be recalled arbitrarily. Supports: processor settings, gain, trim, pan and processor ordering.]]
}

function factory() return function()

	local path = ARDOUR.LuaAPI.build_filename(Session:path(), "export", "params.lua")
	function mark()
		local file = io.open(path, "w")
		file:write("") --empty current file from last run
		file:close()
		for r in Session:get_routes():iter() do
			if r:is_monitor () or r:is_auditioner () then goto nextroute end -- skip special routes

			local order = ARDOUR.ProcessorList()
			local x = 0
			repeat
				local proc = r:nth_processor(x)
				if not proc:isnil() then
					order:push_back(proc)
				end
				x = x + 1
			until proc:isnil()

			local route_str, proc_order_str, cache_str = "", "", ""
			local rid = r:to_stateful():id():to_s()
			local pan = r:pan_azimuth_control()
			if pan:isnil() then pan = false else pan = pan:get_value() end --sometimes a route doesn't have pan, like the master.

			local on = 0
			for p in order:iter() do
				local pid = p:to_stateful():id():to_s()
				proc_order_str = proc_order_str .. "[" .. on .. "] = " .. pid ..","
				cache_str = cache_str .. "[" .. pid .. "] = " .. "\"" .. p:display_name() .. "\"" ..","
				on = on + 1
			end

			route_str = "instance = {route_id = " .. rid .. ", gain_control = " .. r:gain_control():get_value() .. ", trim_control = " .. r:trim_control():get_value() .. ", pan_control = " .. tostring(pan) .. ", order = {" .. proc_order_str .."}, cache = {" .. cache_str .. "}" .. "}"
			file = io.open(path, "a")
			file:write(route_str, "\r\n")
			file:close()

			local i = 0
			while true do
				local params = {}
				local proc_str, params_str = "", ""
				local proc = r:nth_plugin (i)
				if proc:isnil () then break end
				local active = proc:active()
				local id = proc:to_stateful():id():to_s()
				local plug = proc:to_insert ():plugin (0)
				local n = 0 -- count control-ports
				for j = 0, plug:parameter_count () - 1 do -- iterate over all plugin parameters
					if plug:parameter_is_control (j) then
						local label = plug:parameter_label (j)
						if plug:parameter_is_input (j) and label ~= "hidden" and label:sub (1,1) ~= "#" then
							local _, _, pd = ARDOUR.LuaAPI.plugin_automation(proc, n)
							local val = ARDOUR.LuaAPI.get_processor_param(proc, j, true)
							if not(val == pd.normal) then
								params[n] = val
							end
						end
						n = n + 1
					end
				end
				i = i + 1
				for k, v in pairs(params) do
					params_str = params_str .. "[".. k .."] = " .. v .. ","
				end
				proc_str = "instance = {plugin_id = " .. id .. ", parameters = {" .. params_str .. "}, active = " .. tostring(active) .. "}"
				file = io.open(path, "a")
				file:write(proc_str, "\r\n")
				file:close()
			end
			::nextroute::
		end
	end
	local invalidate = {}
	function recall()
		local file = io.open(path, "r")
		assert(file, "File not found!")
		for l in file:lines() do
			--print(l)

			local plugin, route = false, false
			local f = load(l)
			f ()

			if instance["route_id"]  ~= nil then route = true end
			if instance["plugin_id"] ~= nil then plugin = true end

			function new_plugin(name)
				local plugin = nil
				for x = 0, 6 do
					plugin = ARDOUR.LuaAPI.new_plugin(Session, name, x, "")
					if not(plugin:isnil()) then break end
				end return plugin
			end

			if route then
				local old_order = ARDOUR.ProcessorList()
				local rid = PBD.ID(instance["route_id"])
				local rt = Session:route_by_id(rid)
				if rt:isnil() then goto nextline end
				local gc, tc, pc = instance["gain_control"], instance["trim_control"], instance["pan_control"]
				for k, v in pairs(instance["order"]) do
					local proc = Session:processor_by_id(PBD.ID(v))
					if proc:isnil() then
						for id, name in pairs(instance["cache"]) do
							if v == id then
								proc = new_plugin(name)
								invalidate[v] = proc:to_stateful():id():to_s()
							end
						end
					end
					if not(proc:isnil()) then old_order:push_back(proc) end
				end
				rt:gain_control():set_value(gc, 1)
				rt:trim_control():set_value(tc, 1)
				if pc ~= false then rt:pan_azimuth_control():set_value(pc, 1) end
				rt:reorder_processors(old_order, nil)
			end

			if plugin then
				for k, v in pairs(invalidate) do --invalidate deleted plugin id's
					if instance["plugin_id"] == k then
						instance["plugin_id"] = v
					end
				end
				local act = instance["active"]
				local id = PBD.ID(instance["plugin_id"])
				local proc = Session:processor_by_id(id)
				if proc:isnil() then goto nextline end
				for k, v in pairs(instance["parameters"]) do
					ARDOUR.LuaAPI.set_processor_param(proc, k, v)
				end
				if act then proc:activate() else proc:deactivate() end
			end
			::nextline::
		end
	end

	local dialog_options = {
		{ type = "label", colspan= 10, title = "" },
		{ type = "radio",  colspan= 10, key = "select", title = "", values ={ ["1. Mark"] = "mark", ["2. Recall"] = "recall" }, default = "1. Mark"},
		{ type = "label", colspan= 10, title = "" },
	}

	local rv = LuaDialog.Dialog("Mixer Store:", dialog_options):run()
	assert(rv, 'Dialog box was canceled or is ' .. type(rv))
	local c = rv["select"]
	if c == "mark" then mark() end
	if c == "recall" then recall() end

end end