Update Lua VAMP scripts to show a progress dialog

scripts/_vamp_note_example.lua

@@ -2,19 +2,6 @@ ardour { ["type"] = "Snippet", name = "Vamp Audio Transcription Example" }
 
 function factory () return function ()
 
-	-- simple progress information print()ing
-	--[[
-	local progress_total;
-	local progress_last;
-	function cb (_f, pos)
-		local progress = 100 * pos / progress_total;
-		if progress - progress_last > 5 then
-			progress_last = progress;
-			print ("Progress: ", progress)
-		end
-	end
-	--]]
-
 	-- get Editor selection
 	-- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:Editor
 	-- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:Selection
@@ -25,16 +12,33 @@ function factory () return function ()
 	-- see http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:LuaAPI:Vamp
 	local vamp = ARDOUR.LuaAPI.Vamp ("libardourvampplugins:qm-transcription", sr)
 
+	-- prepare progress dialog
+	local progress_total = 0;
+	local progress_part = 0
+	local pdialog = LuaDialog.LuaProgressWindow ("Audio to MIDI", true)
+	function cb (_, pos)
+		return pdialog:progress ((pos + progress_part) / progress_total, "Analyzing")
+	end
+
+	-- calculate max progress
+	for r in sel.regions:regionlist ():iter () do
+		progress_total = progress_total + r:to_readable ():readable_length ()
+	end
+
 	-- for each selected region
 	-- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:RegionSelection
 	for r in sel.regions:regionlist ():iter () do
 		-- "r" is-a http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:Region
 
-		--[[
-		progress_total = r:to_readable ():readable_length ()
-		progress_last = 0
-		--]]
-		vamp:analyze (r:to_readable (), 0, nil --[[cb--]])
+		vamp:analyze (r:to_readable (), 0, cb)
+
+		if pdialog:canceled () then
+			goto out
+		end
+
+		progress_part = progress_part + r:to_readable ():readable_length ()
+		pdialog:progress (progress_part / progress_total, "Post Processing")
+
 		print ("-- Post Processing: ", r:name ())
 
 		-- post-processing takes longer than actually parsing the data :(
@@ -54,4 +58,11 @@ function factory () return function ()
 		vamp:reset ()
 	end
 
+	::out::
+	-- hide modal progress dialog and destroy it
+	pdialog:done ();
+	pdialog = nil
+	vamp = nil;
+	collectgarbage ()
+
 end end

scripts/_vamp_onset_example.lua

@@ -43,6 +43,7 @@ function factory () return function ()
 					end
 				end
 			end
+			return false -- continue, !cancel
 		end
 
 		-- Configure Vamp plugin

scripts/_vamp_tempomap_example.lua

@@ -54,6 +54,7 @@ function factory () return function ()
 					end
 				end
 			end
+			return false -- continue, !cancel
 		end
 
 		vamp:plugin ():setParameter ("Beats Per Bar", 4); -- TODO ask

scripts/vamp_audio_to_midi.lua

@@ -22,6 +22,8 @@ function factory () return function ()
 	local audio_regions = {}
 	local start_time = Session:current_end_sample ()
 	local end_time = Session:current_start_sample ()
+	local max_pos = 0
+	local cur_pos = 0
 	for r in sel.regions:regionlist ():iter () do
 		if r:to_midiregion():isnil() then
 			local st = r:position()
@@ -34,6 +36,7 @@ function factory () return function ()
 				end_time = et
 			end
 			table.insert(audio_regions, r)
+			max_pos = max_pos + r:to_readable ():readable_length ()
 		else
 			midi_region = r:to_midiregion()
 		end
@@ -42,11 +45,24 @@ function factory () return function ()
 	midi_region:set_initial_position(start_time)
 	midi_region:set_length(end_time - start_time, 0)
 
+	local pdialog = LuaDialog.LuaProgressWindow ("Audio to MIDI", true)
+	function progress (_, pos)
+		return pdialog:progress ((cur_pos + pos) / max_pos, "Analyzing")
+	end
+
 	for i,ar in pairs(audio_regions) do
 		local a_off = ar:position ()
 		local b_off = midi_region:quarter_note () - midi_region:start_beats ()
 
-		vamp:analyze (ar:to_readable (), 0, nil)
+		vamp:analyze (ar:to_readable (), 0, progress)
+
+		if pdialog:canceled () then
+			goto out
+		end
+
+		cur_pos = cur_pos + ar:to_readable ():readable_length ()
+		pdialog:progress (cur_pos / max_pos, "Generating MIDI")
+
 		local fl = vamp:plugin ():getRemainingFeatures ():at (0)
 		if fl and fl:size() > 0 then
 			local mm = midi_region:midi_source(0):model()
@@ -66,7 +82,15 @@ function factory () return function ()
 			end
 			mm:apply_command (Session, midi_command)
 		end
+		-- reset the plugin (prepare for next iteration)
+		vamp:reset ()
 	end
+
+	::out::
+	pdialog:done ();
+	pdialog = nil
+	vamp = nil;
+	collectgarbage ()
 end end
 
 function icon (params) return function (ctx, width, height, fg)