Requests: Add scene transition override requests

Adds these requests:
- `SetSceneTransitionOverride`
- `RemoveSceneTransitionOverride`
- `GetSceneTransitionOverride`

src/WSRequestHandler.cpp

@@ -46,6 +46,9 @@ const QHash<QString, RpcMethodHandler> WSRequestHandler::messageMap {
 	{ "SetCurrentScene", &WSRequestHandler::SetCurrentScene },
 	{ "GetCurrentScene", &WSRequestHandler::GetCurrentScene },
 	{ "GetSceneList", &WSRequestHandler::GetSceneList },
+	{ "SetSceneTransitionOverride", &WSRequestHandler::SetSceneTransitionOverride },
+	{ "RemoveSceneTransitionOverride", &WSRequestHandler::RemoveSceneTransitionOverride },
+	{ "GetSceneTransitionOverride", &WSRequestHandler::GetSceneTransitionOverride },
 
 	{ "SetSourceRender", &WSRequestHandler::SetSceneItemRender }, // Retrocompat
 	{ "SetSceneItemRender", &WSRequestHandler::SetSceneItemRender },

src/WSRequestHandler.h

@@ -64,6 +64,9 @@ class WSRequestHandler {
 		RpcResponse SetCurrentScene(const RpcRequest&);
 		RpcResponse GetCurrentScene(const RpcRequest&);
 		RpcResponse GetSceneList(const RpcRequest&);
+		RpcResponse SetSceneTransitionOverride(const RpcRequest&);
+		RpcResponse RemoveSceneTransitionOverride(const RpcRequest&);
+		RpcResponse GetSceneTransitionOverride(const RpcRequest&);
 
 		RpcResponse SetSceneItemRender(const RpcRequest&);
 		RpcResponse SetSceneItemPosition(const RpcRequest&);

src/WSRequestHandler_Scenes.cpp

@@ -148,3 +148,119 @@ RpcResponse WSRequestHandler::ReorderSceneItems(const RpcRequest& request) {
 
 	return request.success();
 }
+
+/**
+ * Set a scene to use a specific transition override.
+ *
+ * @param {String} `sceneName` Name of the scene to switch to.
+ * @param {String} `transitionName` Name of the transition to use.
+ * @param {int (Optional)} `transitionDuration` Duration in milliseconds of the transition if transition is not fixed. Defaults 300 if there is no current override and this value is not given.
+ *
+ * @api requests
+ * @name SetSceneTransitionOverride
+ * @category scenes
+ * @since 4.9.0
+ */
+RpcResponse WSRequestHandler::SetSceneTransitionOverride(const RpcRequest& request) {
+	if (!request.hasField("sceneName") || !request.hasField("transitionName")) {
+		return request.failed("missing request parameters");
+	}
+
+	QString sceneName = obs_data_get_string(request.parameters(), "sceneName");
+	OBSSourceAutoRelease source = obs_get_source_by_name(sceneName.toUtf8());
+	if (!source) {
+		return request.failed("requested scene does not exist");
+	} else if (!(obs_source_get_type(source) == OBS_SOURCE_TYPE_SCENE)) {
+		return request.failed("requested scene is invalid");
+	}
+	
+	QString transitionName = obs_data_get_string(request.parameters(), "transitionName");
+	if (!Utils::GetTransitionFromName(transitionName)) {
+		return request.failed("requested transition does not exist");
+	}
+
+	obs_data_t *sourceData = obs_source_get_private_settings(source);
+
+	int transitionDuration = obs_data_get_int(sourceData, "transition_duration");
+	if (request.hasField("transitionDuration")) {
+		transitionDuration = obs_data_get_int(request.parameters(), "transitionDuration");
+	} else if (!transitionDuration) {
+		transitionDuration = 300;
+	}
+
+	obs_data_set_string(sourceData, "transition", transitionName.toUtf8());
+	obs_data_set_int(sourceData, "transition_duration", transitionDuration);
+	obs_data_release(sourceData);
+
+	return request.success();
+}
+
+/**
+ * Remove any transition override on a scene.
+ *
+ * @param {String} `sceneName` Name of the scene to switch to.
+ *
+ * @api requests
+ * @name RemoveSceneTransitionOverride
+ * @category scenes
+ * @since 4.9.0
+ */
+RpcResponse WSRequestHandler::RemoveSceneTransitionOverride(const RpcRequest& request) {
+	if (!request.hasField("sceneName")) {
+		return request.failed("missing request parameters");
+	}
+
+	QString sceneName = obs_data_get_string(request.parameters(), "sceneName");
+	OBSSourceAutoRelease source = obs_get_source_by_name(sceneName.toUtf8());
+	if (!source) {
+		return request.failed("requested scene does not exist");
+	} else if (!(obs_source_get_type(source) == OBS_SOURCE_TYPE_SCENE)) {
+		return request.failed("requested scene is invalid");
+	}
+
+	obs_data_t *sourceData = obs_source_get_private_settings(source);
+	obs_data_erase(sourceData, "transition");
+	obs_data_erase(sourceData, "transition_duration");
+	obs_data_release(sourceData);
+
+	return request.success();
+}
+
+/**
+ * Get the current scene transition override.
+ *
+ * @param {String} `sceneName` Name of the scene to switch to.
+ *
+ * @return {String} `transitionName` Name of the current overriding transition. Empty string if no override is set.
+ * @return {int} `transitionDuration` Transition duration. `-1` if no override is set.
+ *
+ * @api requests
+ * @name GetSceneTransitionOverride
+ * @category scenes
+ * @since 4.9.0
+ */
+RpcResponse WSRequestHandler::GetSceneTransitionOverride(const RpcRequest& request) {
+	if (!request.hasField("sceneName")) {
+		return request.failed("missing request parameters");
+	}
+
+	QString sceneName = obs_data_get_string(request.parameters(), "sceneName");
+	OBSSourceAutoRelease source = obs_get_source_by_name(sceneName.toUtf8());
+	if (!source) {
+		return request.failed("requested scene does not exist");
+	} else if (!(obs_source_get_type(source) == OBS_SOURCE_TYPE_SCENE)) {
+		return request.failed("requested scene is invalid");
+	}
+
+	OBSDataAutoRelease data = obs_data_create();
+	obs_data_t *sourceData = obs_source_get_private_settings(source);
+	obs_data_set_string(data, "transitionName", obs_data_get_string(sourceData, "transition"));
+	if (!obs_data_get_int(sourceData, "transition_duration")) {
+		obs_data_set_int(data, "transitionDuration", -1);
+	} else {
+		obs_data_set_int(data, "transitionDuration", obs_data_get_int(sourceData, "transition_duration"));
+	}
+	obs_data_release(sourceData);
+
+	return request.success(data);
+}