modules/lua/libs/vlm.c

   1 /*****************************************************************************
   2  * vlm.c: Generic lua VLM wrapper
   3  *****************************************************************************
   4  * Copyright (C) 2007-2008 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Antoine Cellerier <dionoea at videolan tod 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 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #ifndef  _GNU_SOURCE
  28 #   define  _GNU_SOURCE
  29 #endif
  30
  31 #ifdef HAVE_CONFIG_H
  32 # include "config.h"
  33 #endif
  34
  35 #include <vlc_common.h>
  36 #include <vlc_vlm.h>
  37
  38 #include "../vlc.h"
  39 #include "../libs.h"
  40
  41 /*****************************************************************************
  42  *
  43  *****************************************************************************/
  44 #ifdef ENABLE_VLM
  45 static int vlclua_vlm_delete( lua_State * );
  46 static int vlclua_vlm_execute_command( lua_State * );
  47
  48 static const luaL_Reg vlclua_vlm_reg[] = {
  49     { "execute_command", vlclua_vlm_execute_command },
  50     { NULL, NULL }
  51 };
  52
  53 static int vlclua_vlm_new( lua_State *L )
  54 {
  55     vlc_object_t *p_this = vlclua_get_this( L );
  56     vlm_t *p_vlm = vlm_New( p_this->obj.libvlc, NULL );
  57     if( !p_vlm )
  58         return luaL_error( L, "Cannot start VLM." );
  59
  60     vlm_t **pp_vlm = lua_newuserdata( L, sizeof( vlm_t * ) );
  61     *pp_vlm = p_vlm;
  62
  63     if( luaL_newmetatable( L, "vlm" ) )
  64     {
  65         lua_newtable( L );
  66         luaL_register( L, NULL, vlclua_vlm_reg );
  67         lua_setfield( L, -2, "__index" );
  68         lua_pushcfunction( L, vlclua_vlm_delete );
  69         lua_setfield( L, -2, "__gc" );
  70     }
  71
  72     lua_setmetatable( L, -2 );
  73     return 1;
  74 }
  75
  76 static int vlclua_vlm_delete( lua_State *L )
  77 {
  78     vlm_t **pp_vlm = (vlm_t**)luaL_checkudata( L, 1, "vlm" );
  79     vlm_Delete( *pp_vlm );
  80     return 0;
  81 }
  82
  83 static void push_message( lua_State *L, vlm_message_t *message )
  84 {
  85     lua_createtable( L, 0, 2 );
  86     lua_pushstring( L, message->psz_name );
  87     lua_setfield( L, -2, "name" );
  88     if( message->i_child > 0 )
  89     {
  90         int i;
  91         lua_createtable( L, message->i_child, 0 );
  92         for( i = 0; i < message->i_child; i++ )
  93         {
  94             lua_pushinteger( L, i+1 );
  95             push_message( L, message->child[i] );
  96             lua_settable( L, -3 );
  97         }
  98         lua_setfield( L, -2, "children" );
  99     }
 100     if ( message->psz_value )
 101     {
 102         lua_pushstring( L, message->psz_value );
 103         lua_setfield( L, -2, "value" );
 104     }
 105 }
 106
 107 static int vlclua_vlm_execute_command( lua_State *L )
 108 {
 109     vlm_t **pp_vlm = (vlm_t**)luaL_checkudata( L, 1, "vlm" );
 110     const char *psz_command = luaL_checkstring( L, 2 );
 111     vlm_message_t *message;
 112     int i_ret;
 113     i_ret = vlm_ExecuteCommand( *pp_vlm, psz_command, &message );
 114     lua_settop( L, 0 );
 115     push_message( L, message );
 116     vlm_MessageDelete( message );
 117     return 1 + vlclua_push_ret( L, i_ret );
 118 }
 119
 120 #else
 121 static int vlclua_vlm_new( lua_State *L )
 122 {
 123     return luaL_error( L, "Cannot start VLM because it was disabled when compiling VLC." );
 124 }
 125 #endif
 126
 127 /*****************************************************************************
 128  *
 129  *****************************************************************************/
 130 void luaopen_vlm( lua_State *L )
 131 {
 132     lua_pushcfunction( L, vlclua_vlm_new );
 133     lua_setfield( L, -2, "vlm" );
 134 }