add support for previous scene on media tab

src/advanced-scene-switcher.cpp

@@ -90,6 +90,7 @@ SceneSwitcher::SceneSwitcher(QWidget *parent)
 
 	ui->sceneRoundTripScenes2->addItem(PREVIOUS_SCENE_NAME);
 	ui->idleScenes->addItem(PREVIOUS_SCENE_NAME);
+	ui->mediaScenes->addItem(PREVIOUS_SCENE_NAME);
 
 	obs_frontend_source_list *transitions = new obs_frontend_source_list();
 	obs_frontend_get_transitions(transitions);
@@ -291,7 +292,9 @@ SceneSwitcher::SceneSwitcher(QWidget *parent)
 
 	for (auto &s : switcher->mediaSwitches) {
 		string sourceName = GetWeakSourceName(s.source);
-		string sceneName = GetWeakSourceName(s.scene);
+		string sceneName = (s.usePreviousScene)
+					   ? PREVIOUS_SCENE_NAME
+					   : GetWeakSourceName(s.scene);
 		string transitionName = GetWeakSourceName(s.transition);
 		QString listText = MakeMediaSwitchName(
 			sourceName.c_str(), sceneName.c_str(),
@@ -723,7 +726,8 @@ static void SaveSceneSwitcher(obs_data_t *save_data, bool saving, void *)
 				obs_weak_source_get_source(s.scene);
 			obs_source_t *transition =
 				obs_weak_source_get_source(s.transition);
-			if (source && sceneSource && transition) {
+			if ((s.usePreviousScene || source) && sceneSource &&
+			    transition) {
 				const char *sourceName =
 					obs_source_get_name(source);
 				const char *sceneName =
@@ -732,8 +736,10 @@ static void SaveSceneSwitcher(obs_data_t *save_data, bool saving, void *)
 					obs_source_get_name(transition);
 				obs_data_set_string(array_obj, "source",
 						    sourceName);
-				obs_data_set_string(array_obj, "scene",
-						    sceneName);
+				obs_data_set_string(
+					array_obj, "scene",
+					s.usePreviousScene ? PREVIOUS_SCENE_NAME
+							   : sceneName);
 				obs_data_set_string(array_obj, "transition",
 						    transitionName);
 				obs_data_set_int(array_obj, "state", s.state);
@@ -1179,7 +1185,8 @@ static void SaveSceneSwitcher(obs_data_t *save_data, bool saving, void *)
 				GetWeakSourceByName(scene),
 				GetWeakSourceByName(source),
 				GetWeakTransitionByName(transition), state,
-				restriction, time);
+				restriction, time,
+				(strcmp(scene, PREVIOUS_SCENE_NAME) == 0));
 		}
 
 		string autoStopScene =

src/headers/switcher-data-structs.hpp

@@ -208,16 +208,19 @@ struct MediaSwitch {
 	uint64_t time;
 	time_restriction restriction;
 	bool matched;
+	bool usePreviousScene;
 
 	inline MediaSwitch(OBSWeakSource scene_, OBSWeakSource source_,
 			   OBSWeakSource transition_, obs_media_state state_,
-			   time_restriction restriction_, uint64_t time_)
+			   time_restriction restriction_, uint64_t time_,
+			   bool usePreviousScene_)
 		: scene(scene_),
 		  source(source_),
 		  transition(transition_),
 		  state(state_),
 		  restriction(restriction_),
-		  time(time_)
+		  time(time_),
+		  usePreviousScene(usePreviousScene_)
 	{
 	}
 };

src/media-switch.cpp

@@ -30,8 +30,9 @@ void SceneSwitcher::on_mediaAdd_clicked()
 	item->setData(Qt::UserRole, v);
 
 	lock_guard<mutex> lock(switcher->m);
-	switcher->mediaSwitches.emplace_back(scene, source, transition, state,
-					     restriction, time);
+	switcher->mediaSwitches.emplace_back(
+		scene, source, transition, state, restriction, time,
+		(sceneName == QString(PREVIOUS_SCENE_NAME)));
 }
 
 void SceneSwitcher::on_mediaRemove_clicked()
@@ -79,7 +80,9 @@ void SwitcherData::checkMediaSwitch(bool &match, OBSWeakSource &scene,
 			  duration - time > mediaSwitch.time));
 		if (matched && !mediaSwitch.matched) {
 			match = true;
-			scene = mediaSwitch.scene;
+			scene = (mediaSwitch.usePreviousScene)
+					? previousScene
+					: mediaSwitch.scene;
 			transition = mediaSwitch.transition;
 		}
 		mediaSwitch.matched = matched;