Example Lua script to add plugins and sends

share/scripts/_channelstrip.lua

@@ -0,0 +1,134 @@
+ardour {
+	["type"]    = "EditorAction",
+	name        = "Channel Strip Setup",
+	license     = "MIT",
+	author      = "Ardour Team",
+	description = [[Add Compressor and EQ plugin to every selected track and if a bus name 'Reverb' exists post-fader reverb send]]
+}
+
+function factory (params)
+	return function ()
+		-- helper functions
+		function plugin_uri (proc)
+			return proc:to_plugininsert():plugin(0):get_info().unique_id
+		end
+		function add_lv2_plugin (route, pluginname, position)
+			local p = ARDOUR.LuaAPI.new_plugin (Session, pluginname, ARDOUR.PluginType.LV2, "")
+			if not p:isnil () then
+				route:add_processor_by_index (p, position, nil, true)
+			end
+		end
+		function test_send_dest (send, route)
+			local intsend = send:to_internalsend()
+			if intsend:isnil () then return false end
+			return intsend:target_route () == route
+		end
+
+		-- Test if there is a Bus named "Reverb"
+		local reverb_bus = Session:route_by_name ("Reverb")
+		if reverb_bus:isnil () or not reverb_bus:to_track ():isnil () then
+			reverb_bus = nil;
+		end
+
+		-- Iterate over all selected Track/Bus
+		-- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:TrackSelection
+		local sel = Editor:get_selection ()
+		for route in sel.tracks:routelist ():iter () do
+			local have_eq   = false
+			local comp_pos  = 0
+			local add_send  = false
+
+			-- skip master-bus
+			if route:is_master() then goto next end
+
+			-- iterate over all plugins on the route,
+			-- check if a a-eq or a-comp is already present
+			local i = 0;
+			repeat
+				local proc = route:nth_plugin (i) -- get Nth Ardour::Processor
+				if (not proc:isnil()) and plugin_uri (proc) == "urn:ardour:a-eq" then
+					have_eq = true;
+				end
+				if (not proc:isnil()) and (plugin_uri (proc) == "urn:ardour:a-comp" or plugin_uri (proc) == "urn:ardour:a-comp#stereo") then
+					comp_pos = i + 1; -- remember position of compressor
+				end
+				i = i + 1
+			until proc:isnil()
+
+			-- check if there is a send to the reverb bus 
+			if reverb_bus then
+				add_send = true;
+				i = 0;
+				repeat
+					local send = route:nth_send (i) -- get Nth Ardour::Send
+					if not send:isnil() and test_send_dest (send, reverb_bus) then
+						add_send = false
+					end
+					i = i + 1
+				until send:isnil()
+			end
+
+			-- plugins are inserted at the top (pos = 0).
+			-- So they have to be added in reverse order:
+			-- If the compressor is not yet present (comp_pos == 0),
+			-- first add the EQ, and then the compressor before the EQ.
+			-- Otherwise add the EQ after the compressor.
+			if not have_eq then
+				add_lv2_plugin (route, "urn:ardour:a-eq", comp_pos)
+			end
+
+			if comp_pos == 0 then
+				if route:n_inputs ():n_audio () == 2 then
+					add_lv2_plugin (route, "urn:ardour:a-comp#stereo", 0)
+				else
+					add_lv2_plugin (route, "urn:ardour:a-comp", 0)
+				end
+			end
+	
+			--add send to reverb bus, post-fader, just before the track's mains output.
+			if add_send then
+				Session:add_internal_send (reverb_bus, route:main_outs (), route)
+			end
+
+			::next::
+
+		end
+	end
+end
+
+function icon (params) return function (ctx, width, height, fg)
+	function rnd (x) return math.floor (x + 0.5) end
+
+	local wc = rnd (width * 0.5) - 0.5
+	local wl = wc - math.floor (width * .25)
+	local wr = wc + math.floor (width * .25)
+
+	local h0 = height * 0.2
+	local h1 = height * 0.8
+
+	local fw = math.floor (width * .1)
+	local fl = rnd (height * .35) - 1
+	local fc = rnd (height * .65) - 1
+	local fr = rnd (height * .45) - 1
+
+	ctx:set_source_rgba (ARDOUR.LuaAPI.color_to_rgba (fg))
+	ctx:set_line_width (1)
+
+	ctx:move_to (wl, h0)
+	ctx:line_to (wl, h1)
+	ctx:move_to (wc, h0)
+	ctx:line_to (wc, h1)
+	ctx:move_to (wr, h0)
+	ctx:line_to (wr, h1)
+	ctx:stroke ()
+
+	ctx:set_line_width (2)
+
+	ctx:move_to (wl - fw, fl)
+	ctx:line_to (wl + fw, fl)
+	ctx:move_to (wc - fw, fc)
+	ctx:line_to (wc + fw, fc)
+	ctx:move_to (wr - fw, fr)
+	ctx:line_to (wr + fw, fr)
+	ctx:stroke ()
+end end