Extensions: core library

This contains:
- Extensions manager
- Extensions activation / deactivation functions
- Separate threads for each extension
- Lua specific functions for calling the script

modules/misc/lua/extension.h

+/*****************************************************************************
+ * extension.h: Lua Extensions (meta data, web information, ...)
+ *****************************************************************************
+ * Copyright (C) 2009-2010 VideoLAN and authors
+ * $Id$
+ *
+ * Authors: Jean-Philippe André < jpeg # videolan.org >
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifndef LUA_EXTENSION_H
+#define LUA_EXTENSION_H
+
+#include <vlc_extensions.h>
+#include <vlc_arrays.h>
+
+///< Array of extension_t
+TYPEDEF_ARRAY( extension_t, array_extension_t );
+
+/* List of available commands */
+#define CMD_ACTIVATE    1
+#define CMD_DEACTIVATE  2
+#define CMD_TRIGGERMENU 3    /* Arg1 = int*, pointing to id to trigger. free */
+#define CMD_CLICK       4    /* Arg1 = extension_widget_t* */
+#define CMD_CLOSE       5
+
+struct extensions_manager_sys_t
+{
+    /* List of activated extensions */
+    DECL_ARRAY( extension_t* ) activated_extensions;
+
+    /* Lua specific */
+    lua_State *L;
+
+    vlc_mutex_t lock;
+    bool b_killed;
+};
+
+struct extension_sys_t
+{
+    /* Extension general */
+    int i_capabilities;
+
+    /* Lua specific */
+    lua_State *L;
+
+    /* Thread data */
+    vlc_thread_t thread;
+    vlc_mutex_t command_lock;
+    vlc_mutex_t running_lock;
+    vlc_cond_t wait;
+    bool b_exiting;
+    extensions_manager_t *p_mgr;     ///< Parent
+    /* Queue of commands to execute */
+    struct command_t
+    {
+        int i_command;
+        void *data[10];         ///< Optional void* arguments
+        struct command_t *next; ///< Next command
+    } *command;
+};
+
+/* Extensions: manager functions */
+int Activate( extensions_manager_t *p_mgr, extension_t * );
+bool IsActivated( extensions_manager_t *p_mgr, extension_t * );
+int Deactivate( extensions_manager_t *p_mgr, extension_t * );
+void WaitForDeactivation( extension_t *p_ext );
+int PushCommand( extension_t *p_ext, int i_command, ... );
+bool LockExtension( extension_t *p_ext );
+void UnlockExtension( extension_t *p_ext );
+
+/* Lua specific functions */
+extension_t *vlclua_extension_get( lua_State *L );
+int lua_ExtensionActivate( extensions_manager_t *, extension_t * );
+int lua_ExtensionDeactivate( extensions_manager_t *, extension_t * );
+int lua_ExecuteFunction( extensions_manager_t *p_mgr, extension_t *p_ext,
+                         const char *psz_function );
+int lua_ExtensionWidgetClick( extensions_manager_t *p_mgr,
+                              extension_t *p_ext,
+                              extension_widget_t *p_widget );
+int lua_ExtensionTriggerMenu( extensions_manager_t *p_mgr,
+                              extension_t *p_ext, int id );
+
+#endif // LUA_EXTENSION_H