Add ENGINE_CALLBACK_IDLE

source/backend/CarlaBackend.h

@@ -910,22 +910,29 @@ typedef enum {
      */
     ENGINE_CALLBACK_SAMPLE_RATE_CHANGED = 33,
 
+    /*!
+     * Idle frontend.\n
+     * This is used by the engine during long operations that might block the frontend,
+     * giving it the possibility to idle while the operation is still in place.
+     */
+    ENGINE_CALLBACK_IDLE = 34,
+
     /*!
      * Show a message as information.
      * @param valueStr The message
      */
-    ENGINE_CALLBACK_INFO = 34,
+    ENGINE_CALLBACK_INFO = 35,
 
     /*!
      * Show a message as an error.
      * @param valueStr The message
      */
-    ENGINE_CALLBACK_ERROR = 35,
+    ENGINE_CALLBACK_ERROR = 36,
 
     /*!
      * The engine has crashed or malfunctioned and will no longer work.
      */
-    ENGINE_CALLBACK_QUIT = 36
+    ENGINE_CALLBACK_QUIT = 37
 
 } EngineCallbackOpcode;
 

source/carla_backend.py

@@ -651,16 +651,21 @@ ENGINE_CALLBACK_BUFFER_SIZE_CHANGED = 32
 # @param value3 New sample rate
 ENGINE_CALLBACK_SAMPLE_RATE_CHANGED = 33
 
+# Idle frontend.
+# This is used by the engine during long operations that might block the frontend,
+# giving it the possibility to idle while the operation is still in place.
+ENGINE_CALLBACK_IDLE = 34
+
 # Show a message as information.
 # @param valueStr The message
-ENGINE_CALLBACK_INFO = 34
+ENGINE_CALLBACK_INFO = 35
 
 # Show a message as an error.
 # @param valueStr The message
-ENGINE_CALLBACK_ERROR = 35
+ENGINE_CALLBACK_ERROR = 36
 
 # The engine has crashed or malfunctioned and will no longer work.
-ENGINE_CALLBACK_QUIT = 36
+ENGINE_CALLBACK_QUIT = 37
 
 # ------------------------------------------------------------------------------------------------------------
 # Engine Option

source/utils/CarlaBackendUtils.hpp

@@ -271,6 +271,8 @@ const char* EngineCallbackOpcode2Str(const EngineCallbackOpcode opcode) noexcept
         return "ENGINE_CALLBACK_BUFFER_SIZE_CHANGED";
     case ENGINE_CALLBACK_SAMPLE_RATE_CHANGED:
         return "ENGINE_CALLBACK_SAMPLE_RATE_CHANGED";
+    case ENGINE_CALLBACK_IDLE:
+        return "ENGINE_CALLBACK_IDLE";
     case ENGINE_CALLBACK_INFO:
         return "ENGINE_CALLBACK_INFO";
     case ENGINE_CALLBACK_ERROR: