1 files changed, 130 insertions, 0 deletions
diff --git a/share/scripts/midi_cc_to_automation.lua b/share/scripts/midi_cc_to_automation.lua
new file mode 100644
index 0000000000..a1bab91a05
--- /dev/null
+++ b/share/scripts/midi_cc_to_automation.lua
@@ -0,0 +1,130 @@
+ardour { ["type"] = "EditorAction", name = "MIDI CC to Plugin Automation",
+	license     = "MIT",
+	author      = "Ardour Team",
+	description = [[Parse a given MIDI control changes (CC) from all selected MIDI regions and convert them into plugin parameter automation]]
+}
+
+function factory () return function ()
+	-- find possible target parameters, collect them in a nested table
+	--   [track-name] -> [plugin-name] -> [parameters]
+	-- to allow selection in a dropdown menu
+	local targets = {}
+	local have_entries = false
+	for r in Session:get_routes ():iter () do -- for every track/bus
+		if r:is_monitor () or r:is_auditioner () then goto nextroute end -- skip special routes
+		local i = 0
+		while true do -- iterate over all plugins on the route
+			local proc = r:nth_plugin (i)
+			if proc:isnil () then break end
+			local plug = proc:to_insert ():plugin (0) -- we know it's a plugin-insert (we asked for nth_plugin)
+			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 nn = n --local scope for return value function
+						-- create table parents only if needed (if there's at least one parameter)
+						if not targets [r:name ()] then targets [r:name ()] = {} end
+						-- TODO handle ambiguity if there are 2 plugins with the same name on the same track
+						if not targets [r:name ()][proc:display_name ()] then targets [r:name ()][proc:display_name ()] = {} end
+						-- we need 2 return values: the plugin-instance and the parameter-id, so we use a table (associative array)
+						-- however, we cannot directly use a table: the dropdown menu would expand it as another sub-menu.
+						-- so we produce a function that will return the table.
+						targets [r:name ()][proc:display_name ()][label] = function () return {["p"] = proc, ["n"] = nn} end
+						have_entries = true
+					end
+					n = n + 1
+				end
+			end
+			i = i + 1
+		end
+		::nextroute::
+	end
+
+	-- bail out if there are no parameters
+	if not have_entries then
+		LuaDialog.Message ("CC to Plugin Automation", "No Plugins found", LuaDialog.MessageType.Info, LuaDialog.ButtonType.Close):run ()
+		targets = nil
+		collectgarbage ()
+		return
+	end
+
+	-- create a dialog, ask user which MIDI-CC to map and to what parameter
+	local dialog_options = {
+		{ type = "heading", title = "MIDI CC Source", align = "left" },
+		{ type = "number", key = "channel", title = "Channel",  min = 1, max = 16, step = 1, digits = 0 },
+		{ type = "number", key = "ccparam", title = "CC Parameter",  min = 0, max = 127, step = 1, digits = 0 },
+		{ type = "heading", title = "Target Track and Plugin", align = "left"},
+		{ type = "dropdown", key = "param", title = "Target Parameter", values = targets }
+	}
+	local rv = LuaDialog.Dialog ("Select Taget", dialog_options):run ()
+
+	targets = nil -- drop references (the table holds shared-pointer references to all plugins)
+	collectgarbage () -- and release the references immediately
+
+	if not rv then return end -- user cancelled
+
+	-- parse user response
+
+	assert (type (rv["param"]) == "function")
+	local midi_channel = rv["channel"] - 1 -- MIDI channel 0..15
+	local cc_param = rv["ccparam"]
+	local pp = rv["param"]() -- evaluate function, retrieve table {["p"] = proc, ["n"] = nn}
+	local al, _, pd = ARDOUR.LuaAPI.plugin_automation (pp["p"], pp["n"])
+	rv = nil -- drop references
+	assert (not al:isnil ())
+	assert (midi_channel >= 0 and midi_channel < 16)
+	assert (cc_param >= 0 and cc_param < 128)
+
+	-- all systems go
+	local add_undo = false
+	Session:begin_reversible_command ("CC to Automation")
+	local before = al:get_state () -- save previous state (for undo)
+	al:clear_list () -- clear target automation-list
+
+	-- for all selected MIDI regions
+	local sel = Editor:get_selection ()
+	for r in sel.regions:regionlist ():iter () do
+		local mr = r:to_midiregion ()
+		if mr:isnil () then goto next end
+
+		-- get list of MIDI-CC events for the given channel and parameter
+		local ec = mr:control (Evoral.Parameter (ARDOUR.AutomationType.MidiCCAutomation, midi_channel, cc_param), false)
+		if ec:isnil () then goto next end
+		if ec:list ():events ():size () == 0 then goto next end
+
+		-- MIDI events are timestamped in "bar-beat" units, we need to convert those
+		-- using the tempo-map, relative to the region-start
+		local bfc = ARDOUR.DoubleBeatsSamplesConverter (Session:tempo_map (), r:start ())
+
+		-- iterate over CC-events
+		for av in ec:list ():events ():iter () do
+			-- re-scale event to target range
+			local val = pd.lower + (pd.upper - pd.lower) * av.value / 127
+			-- and add it to the target-parameter automation-list
+			al:add (r:position () - r:start () + bfc:to (av.when), val, false, true)
+			add_undo = true
+		end
+		::next::
+	end
+
+	-- save undo
+	if add_undo then
+		local after = al:get_state ()
+		Session:add_command (al:memento_command (before, after))
+		Session:commit_reversible_command (nil)
+	else
+		Session:abort_reversible_command ()
+		LuaDialog.Message ("CC to Plugin Automation", "No data was converted. Was a MIDI-region with CC-automation selected? ", LuaDialog.MessageType.Info, LuaDialog.ButtonType.Close):run ()
+	end
+	collectgarbage ()
+end end
+
+function icon (params) return function (ctx, width, height, fg)
+	local txt = Cairo.PangoLayout (ctx, "ArdourMono ".. math.ceil (height / 3) .. "px")
+	txt:set_text ("CC\nPA")
+	local tw, th = txt:get_pixel_size ()
+	ctx:set_source_rgba (ARDOUR.LuaAPI.color_to_rgba (fg))
+	ctx:move_to (.5 * (width - tw), .5 * (height - th))
+	txt:show_in_cairo_context (ctx)
+end end