modules/lua/extension.h

   1 /*****************************************************************************
   2  * extension.h: Lua Extensions (meta data, web information, ...)
   3  *****************************************************************************
   4  * Copyright (C) 2009-2010 VideoLAN and authors
   5  * $Id$
   6  *
   7  * Authors: Jean-Philippe André < jpeg # videolan.org >
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifndef LUA_EXTENSION_H
  25 #define LUA_EXTENSION_H
  26
  27 #include <vlc_extensions.h>
  28 #include <vlc_arrays.h>
  29 #include <vlc_dialog.h>
  30
  31 #define WATCH_TIMER_PERIOD    (10 * CLOCK_FREQ) ///< 10s period for the timer
  32
  33 /* List of available commands */
  34 typedef enum
  35 {
  36     CMD_ACTIVATE = 1,
  37     CMD_DEACTIVATE,
  38     CMD_TRIGGERMENU,    /* Arg1 = int*, pointing to id to trigger. free */
  39     CMD_CLICK,          /* Arg1 = extension_widget_t* */
  40     CMD_CLOSE,
  41     CMD_SET_INPUT,      /* No arg. Just signal current input changed */
  42     CMD_UPDATE_META,    /* No arg. Just signal current input item meta changed */
  43     CMD_PLAYING_CHANGED /* Arg1 = int*, New playing status  */
  44 } command_type_e;
  45
  46 //Data types
  47 typedef enum
  48 {
  49     LUA_END = 0,
  50     LUA_NUM,
  51     LUA_TEXT
  52 } lua_datatype_e;
  53
  54 struct extension_sys_t
  55 {
  56     /* Extension general */
  57     int i_capabilities;
  58
  59     /* Lua specific */
  60     lua_State *L;
  61
  62     vlclua_dtable_t dtable;
  63
  64     /* Thread data */
  65     vlc_thread_t thread;
  66     vlc_mutex_t command_lock;
  67     vlc_mutex_t running_lock;
  68     vlc_cond_t wait;
  69
  70     /* The input this extension should use for vlc.input
  71      * or NULL if it should use playlist's current input */
  72     struct input_thread_t *p_input;
  73
  74     extensions_manager_t *p_mgr;     ///< Parent
  75     /* Queue of commands to execute */
  76     struct command_t
  77     {
  78         command_type_e i_command;
  79         void *data[10];         ///< Optional void* arguments
  80         struct command_t *next; ///< Next command
  81     } *command;
  82
  83     // The two following booleans are protected by command_lock
  84     vlc_dialog_id *p_progress_id;
  85     vlc_timer_t timer; ///< This timer makes sure Lua never gets stuck >5s
  86
  87     bool b_exiting;
  88
  89     bool b_thread_running; //< Only accessed out of the extension thread.
  90     bool b_activated; ///< Protected by the command lock
  91 };
  92
  93 /* Extensions: manager functions */
  94 int Activate( extensions_manager_t *p_mgr, extension_t * );
  95 int Deactivate( extensions_manager_t *p_mgr, extension_t * );
  96 bool QueueDeactivateCommand( extension_t *p_ext );
  97 void KillExtension( extensions_manager_t *p_mgr, extension_t *p_ext );
  98 int PushCommand__( extension_t *ext, bool unique, command_type_e cmd, va_list options );
  99 static inline int PushCommand( extension_t *ext, int cmd, ... )
 100 {
 101     va_list args;
 102     va_start( args, cmd );
 103     int i_ret = PushCommand__( ext, false, cmd, args );
 104     va_end( args );
 105     return i_ret;
 106 }
 107 static inline int PushCommandUnique( extension_t *ext, int cmd, ... )
 108 {
 109     va_list args;
 110     va_start( args, cmd );
 111     int i_ret = PushCommand__( ext, true, cmd, args );
 112     va_end( args );
 113     return i_ret;
 114 }
 115
 116 /* Lua specific functions */
 117 void vlclua_extension_set( lua_State *L, extension_t * );
 118 extension_t *vlclua_extension_get( lua_State *L );
 119 int lua_ExtensionActivate( extensions_manager_t *, extension_t * );
 120 int lua_ExtensionDeactivate( extensions_manager_t *, extension_t * );
 121 int lua_ExecuteFunctionVa( extensions_manager_t *p_mgr, extension_t *p_ext,
 122                             const char *psz_function, va_list args );
 123 int lua_ExecuteFunction( extensions_manager_t *p_mgr, extension_t *p_ext,
 124                          const char *psz_function, ... );
 125 int lua_ExtensionWidgetClick( extensions_manager_t *p_mgr,
 126                               extension_t *p_ext,
 127                               extension_widget_t *p_widget );
 128 int lua_ExtensionTriggerMenu( extensions_manager_t *p_mgr,
 129                               extension_t *p_ext, int id );
 130
 131 /* Dialog specific */
 132 int lua_DialogFlush( lua_State *L );
 133
 134 #endif // LUA_EXTENSION_H