Add stub functions for plugin lv2-export in backend

source/backend/CarlaHost.h

@@ -534,6 +534,13 @@ CARLA_EXPORT bool carla_load_plugin_state(uint pluginId, const char* filename);
  */
 CARLA_EXPORT bool carla_save_plugin_state(uint pluginId, const char* filename);
 
+/*!
+ * Export plugin as LV2.
+ * @param pluginId Plugin
+ * @param lv2path Path to lv2 plugin folder
+ */
+CARLA_EXPORT bool carla_export_plugin_lv2(uint pluginId, const char* lv2path);
+
 /*!
  * Get information from a plugin.
  * @param pluginId Plugin

source/backend/CarlaPlugin.hpp

@@ -416,6 +416,11 @@ public:
      */
     bool loadStateFromFile(const char* const filename);
 
+    /*!
+     * Export this plugin as LV2.
+     */
+    bool exportAsLV2(const char* const lv2path);
+
     // -------------------------------------------------------------------
     // Set data (internal stuff)
 

source/backend/CarlaStandalone.cpp

@@ -940,6 +940,25 @@ bool carla_save_plugin_state(uint pluginId, const char* filename)
     return false;
 }
 
+bool carla_export_plugin_lv2(uint pluginId, const char* lv2path)
+{
+    CARLA_SAFE_ASSERT_RETURN(lv2path != nullptr && lv2path[0] != '\0', false);
+    carla_debug("carla_export_plugin_lv2(%i, \"%s\")", pluginId, lv2path);
+
+    if (gStandalone.engine == nullptr)
+    {
+        carla_stderr2("Engine is not running");
+        gStandalone.lastError = "Engine is not running";
+        return false;
+    }
+
+    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
+        return plugin->exportAsLV2(lv2path);
+
+    carla_stderr2("carla_export_plugin_lv2(%i, \"%s\") - could not find plugin", pluginId, lv2path);
+    return false;
+}
+
 // -------------------------------------------------------------------------------------------------------------------
 
 const CarlaPluginInfo* carla_get_plugin_info(uint pluginId)

source/backend/plugin/CarlaPlugin.cpp

@@ -917,6 +917,16 @@ bool CarlaPlugin::loadStateFromFile(const char* const filename)
     return false;
 }
 
+bool CarlaPlugin::exportAsLV2(const char* const lv2path)
+{
+    CARLA_SAFE_ASSERT_RETURN(lv2path != nullptr && lv2path[0] != '\0', false);
+    carla_debug("CarlaPlugin::exportAsLV2(\"%s\")", lv2path);
+
+    // TODO
+
+    return false;
+}
+
 // -------------------------------------------------------------------
 // Set data (internal stuff)
 

source/carla_backend.py

@@ -1474,6 +1474,12 @@ class CarlaHostMeta(object):
     def save_plugin_state(self, pluginId, filename):
         raise NotImplementedError
 
+    # Export plugin as LV2.
+    # @param pluginId Plugin
+    # @param lv2path Path to lv2 plugin folder
+    def export_plugin_lv2(self, pluginId, lv2path):
+        raise NotImplementedError
+
     # Get information from a plugin.
     # @param pluginId Plugin
     @abstractmethod
@@ -1959,6 +1965,9 @@ class CarlaHostNull(CarlaHostMeta):
     def save_plugin_state(self, pluginId, filename):
         return False
 
+    def export_plugin_lv2(self, pluginId, lv2path):
+        return False
+
     def get_plugin_info(self, pluginId):
         return PyCarlaPluginInfo
 
@@ -2235,6 +2244,9 @@ class CarlaHostDLL(CarlaHostMeta):
         self.lib.carla_save_plugin_state.argtypes = [c_uint, c_char_p]
         self.lib.carla_save_plugin_state.restype = c_bool
 
+        self.lib.carla_export_plugin_lv2.argtypes = [c_uint, c_char_p]
+        self.lib.carla_export_plugin_lv2.restype = c_bool
+
         self.lib.carla_get_plugin_info.argtypes = [c_uint]
         self.lib.carla_get_plugin_info.restype = POINTER(CarlaPluginInfo)
 
@@ -2506,6 +2518,9 @@ class CarlaHostDLL(CarlaHostMeta):
     def save_plugin_state(self, pluginId, filename):
         return bool(self.lib.carla_save_plugin_state(pluginId, filename.encode("utf-8")))
 
+    def export_plugin_lv2(self, pluginId, lv2path):
+        return bool(self.lib.carla_export_plugin_lv2(pluginId, lv2path.encode("utf-8")))
+
     def get_plugin_info(self, pluginId):
         return structToDict(self.lib.carla_get_plugin_info(pluginId).contents)
 
@@ -2839,6 +2854,10 @@ class CarlaHostPlugin(CarlaHostMeta):
     def save_plugin_state(self, pluginId, filename):
         return self.sendMsgAndSetError(["save_plugin_state", pluginId, filename])
 
+    def export_plugin_lv2(self, pluginId, lv2path):
+        self.fLastError = "Operation unavailable in plugin version"
+        return False
+
     def get_plugin_info(self, pluginId):
         return self.fPluginsInfo[pluginId].pluginInfo