1 /*****************************************************************************
2 * extension.c: Lua Extensions (meta data, web information, ...)
3 *****************************************************************************
4 * Copyright (C) 2009-2010 VideoLAN and authors
7 * Authors: Jean-Philippe André < jpeg # videolan.org >
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.
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.
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 *****************************************************************************/
26 #include "extension.h"
29 #include <vlc_input.h>
30 #include <vlc_events.h>
32 /* Functions to register */
33 static const luaL_Reg p_reg[] =
39 * Extensions capabilities
40 * Note: #define and ppsz_capabilities must be in sync
42 #define EXT_HAS_MENU (1 << 0) ///< Hook: menu
43 #define EXT_TRIGGER_ONLY (1 << 1) ///< Hook: trigger. Not activable
44 #define EXT_INPUT_LISTENER (1 << 2) ///< Hook: input_changed
45 #define EXT_META_LISTENER (1 << 3) ///< Hook: meta_changed
47 const char* const ppsz_capabilities[] = {
55 static int ScanExtensions( extensions_manager_t *p_this );
56 static int ScanLuaCallback( vlc_object_t *p_this, const char *psz_script,
57 lua_State *L, void *pb_continue );
58 static int Control( extensions_manager_t *, int, va_list );
59 static int GetMenuEntries( extensions_manager_t *p_mgr, extension_t *p_ext,
60 char ***pppsz_titles, uint16_t **ppi_ids );
61 static lua_State* GetLuaState( extensions_manager_t *p_mgr,
63 static int TriggerMenu( extension_t *p_ext, int id );
64 static int TriggerExtension( extensions_manager_t *p_mgr,
67 int vlclua_extension_deactivate( lua_State *L );
70 static int vlclua_extension_dialog_callback( vlc_object_t *p_this,
76 /* Input item callback: vlc_InputItemMetaChanged */
77 static void inputItemMetaChanged( const vlc_event_t *p_event,
84 int Open_Extension( vlc_object_t *p_this )
86 msg_Dbg( p_this, "Opening EXPERIMENTAL Lua Extension module" );
88 extensions_manager_t *p_mgr = ( extensions_manager_t* ) p_this;
90 p_mgr->pf_control = Control;
92 extensions_manager_sys_t *p_sys = ( extensions_manager_sys_t* )
93 calloc( 1, sizeof( extensions_manager_sys_t ) );
94 if( !p_sys ) return VLC_ENOMEM;
97 ARRAY_INIT( p_sys->activated_extensions );
98 ARRAY_INIT( p_mgr->extensions );
99 vlc_mutex_init( &p_mgr->lock );
100 vlc_mutex_init( &p_mgr->p_sys->lock );
102 /* Initialise Lua state structure */
103 lua_State *L = GetLuaState( p_mgr, NULL );
111 /* Scan available Lua Extensions */
112 if( ScanExtensions( p_mgr ) != VLC_SUCCESS )
114 msg_Err( p_mgr, "Can't load extensions modules" );
121 // Create the dialog-event variable
122 var_Create( p_this, "dialog-event", VLC_VAR_ADDRESS );
123 var_AddCallback( p_this, "dialog-event",
124 vlclua_extension_dialog_callback, NULL );
130 * Module unload function
132 void Close_Extension( vlc_object_t *p_this )
134 extensions_manager_t *p_mgr = ( extensions_manager_t* ) p_this;
135 msg_Dbg( p_mgr, "Deactivating all loaded extensions" );
137 vlc_mutex_lock( &p_mgr->lock );
138 p_mgr->p_sys->b_killed = true;
139 vlc_mutex_unlock( &p_mgr->lock );
141 var_Destroy( p_mgr, "dialog-event" );
143 extension_t *p_ext = NULL;
144 FOREACH_ARRAY( p_ext, p_mgr->p_sys->activated_extensions )
147 Deactivate( p_mgr, p_ext );
148 WaitForDeactivation( p_ext );
152 msg_Dbg( p_mgr, "All extensions are now deactivated" );
153 ARRAY_RESET( p_mgr->p_sys->activated_extensions );
155 if( p_mgr->p_sys && p_mgr->p_sys->L )
156 lua_close( p_mgr->p_sys->L );
158 vlc_mutex_destroy( &p_mgr->lock );
159 vlc_mutex_destroy( &p_mgr->p_sys->lock );
160 free( p_mgr->p_sys );
163 /* Free extensions' memory */
164 FOREACH_ARRAY( p_ext, p_mgr->extensions )
168 if( p_ext->p_sys->L )
169 lua_close( p_ext->p_sys->L );
170 free( p_ext->psz_name );
171 free( p_ext->psz_title );
173 vlc_mutex_destroy( &p_ext->p_sys->running_lock );
174 vlc_mutex_destroy( &p_ext->p_sys->command_lock );
175 vlc_cond_destroy( &p_ext->p_sys->wait );
177 free( p_ext->p_sys );
182 ARRAY_RESET( p_mgr->extensions );
186 * Batch scan all Lua files in folder "extensions"
187 * @param p_mgr This extensions_manager_t object
189 static int ScanExtensions( extensions_manager_t *p_mgr )
193 vlclua_scripts_batch_execute( VLC_OBJECT( p_mgr ),
196 p_mgr->p_sys->L, &b_true );
205 * Batch scan all Lua files in folder "extensions": callback
206 * @param p_this This extensions_manager_t object
207 * @param psz_script Name of the script to run
208 * @param L Lua State, common to all scripts here
209 * @param pb_continue bool* that indicates whether to continue batch or not
211 int ScanLuaCallback( vlc_object_t *p_this, const char *psz_script,
212 lua_State *L, void *pb_continue )
214 extensions_manager_t *p_mgr = ( extensions_manager_t* ) p_this;
217 msg_Dbg( p_mgr, "Scanning Lua script %s", psz_script );
219 vlc_mutex_lock( &p_mgr->lock );
221 /* Create new script descriptor */
222 extension_t *p_ext = ( extension_t* ) calloc( 1, sizeof( extension_t ) );
225 vlc_mutex_unlock( &p_mgr->lock );
229 p_ext->psz_name = strdup( psz_script );
230 p_ext->p_sys = (extension_sys_t*) calloc( 1, sizeof( extension_sys_t ) );
231 if( !p_ext->p_sys || !p_ext->psz_name )
233 free( p_ext->psz_name );
234 free( p_ext->p_sys );
236 vlc_mutex_unlock( &p_mgr->lock );
239 p_ext->p_sys->p_mgr = p_mgr;
241 /* Mutexes and conditions */
242 vlc_mutex_init( &p_ext->p_sys->command_lock );
243 vlc_mutex_init( &p_ext->p_sys->running_lock );
244 vlc_cond_init( &p_ext->p_sys->wait );
246 /* Load and run the script(s) */
247 if( luaL_dofile( L, psz_script ) )
249 msg_Warn( p_mgr, "Error loading script %s: %s", psz_script,
250 lua_tostring( L, lua_gettop( L ) ) );
255 /* Scan script for capabilities */
256 lua_getglobal( L, "descriptor" );
258 if( !lua_isfunction( L, -1 ) )
260 msg_Warn( p_mgr, "Error while runing script %s, "
261 "function descriptor() not found", psz_script );
265 if( lua_pcall( L, 0, 1, 0 ) )
267 msg_Warn( p_mgr, "Error while runing script %s, "
268 "function descriptor(): %s", psz_script,
269 lua_tostring( L, lua_gettop( L ) ) );
273 if( lua_gettop( L ) )
275 if( lua_istable( L, -1 ) )
278 lua_getfield( L, -1, "capabilities" );
279 if( lua_istable( L, -1 ) )
282 while( lua_next( L, -2 ) != 0 )
284 /* Key is at index -2 and value at index -1. Discard key */
285 const char *psz_cap = luaL_checkstring( L, -1 );
288 /* Find this capability's flag */
289 for( const char *iter = *ppsz_capabilities;
291 iter = ppsz_capabilities[ ++i_cap ])
293 if( !strcmp( iter, psz_cap ) )
296 p_ext->p_sys->i_capabilities |= 1 << i_cap;
303 msg_Warn( p_mgr, "Extension capability '%s' unknown in"
304 " script %s", psz_cap, psz_script );
306 /* Removes 'value'; keeps 'key' for next iteration */
312 msg_Warn( p_mgr, "In script %s, function descriptor() "
313 "did not return a table of capabilities.",
319 lua_getfield( L, -1, "title" );
320 if( lua_isstring( L, -1 ) )
322 p_ext->psz_title = strdup( luaL_checkstring( L, -1 ) );
326 msg_Dbg( p_mgr, "In script %s, function descriptor() "
327 "did not return a string as title.",
329 p_ext->psz_title = strdup( psz_script );
334 lua_getfield( L, -1, "author" );
335 if( lua_isstring( L, -1 ) )
337 p_ext->psz_author = strdup( luaL_checkstring( L, -1 ) );
341 p_ext->psz_author = NULL;
345 /* Get description */
346 lua_getfield( L, -1, "description" );
347 if( lua_isstring( L, -1 ) )
349 p_ext->psz_description = strdup( luaL_checkstring( L, -1 ) );
353 p_ext->psz_description = NULL;
358 lua_getfield( L, -1, "url" );
359 if( lua_isstring( L, -1 ) )
361 p_ext->psz_url = strdup( luaL_checkstring( L, -1 ) );
365 p_ext->psz_url = NULL;
370 lua_getfield( L, -1, "version" );
371 if( lua_isstring( L, -1 ) )
373 p_ext->psz_version = strdup( luaL_checkstring( L, -1 ) );
377 p_ext->psz_version = NULL;
383 msg_Warn( p_mgr, "In script %s, function descriptor() "
384 "did not return a table!", psz_script );
390 msg_Err( p_mgr, "Script %s went completely foobar", psz_script );
394 msg_Dbg( p_mgr, "Script %s has the following capability flags: 0x%x",
395 psz_script, p_ext->p_sys->i_capabilities );
401 free( p_ext->psz_name );
402 free( p_ext->psz_title );
403 free( p_ext->psz_url );
404 free( p_ext->psz_author );
405 free( p_ext->psz_description );
406 free( p_ext->psz_version );
407 vlc_mutex_destroy( &p_ext->p_sys->command_lock );
408 vlc_mutex_destroy( &p_ext->p_sys->running_lock );
409 vlc_cond_destroy( &p_ext->p_sys->wait );
410 free( p_ext->p_sys );
415 /* Add the extension to the list of known extensions */
416 ARRAY_APPEND( p_mgr->extensions, p_ext );
419 vlc_mutex_unlock( &p_mgr->lock );
420 /* Continue batch execution */
421 return pb_continue ? ( (* (bool*)pb_continue) ? -1 : 0 ) : -1;
424 static int Control( extensions_manager_t *p_mgr, int i_control, va_list args )
426 extension_t *p_ext = NULL;
428 uint16_t **ppus = NULL;
429 char ***pppsz = NULL;
434 case EXTENSION_ACTIVATE:
435 p_ext = ( extension_t* ) va_arg( args, extension_t* );
436 return Activate( p_mgr, p_ext );
438 case EXTENSION_DEACTIVATE:
439 p_ext = ( extension_t* ) va_arg( args, extension_t* );
440 return Deactivate( p_mgr, p_ext );
442 case EXTENSION_IS_ACTIVATED:
443 p_ext = ( extension_t* ) va_arg( args, extension_t* );
444 pb = ( bool* ) va_arg( args, bool* );
445 *pb = IsActivated( p_mgr, p_ext );
448 case EXTENSION_HAS_MENU:
449 p_ext = ( extension_t* ) va_arg( args, extension_t* );
450 pb = ( bool* ) va_arg( args, bool* );
451 *pb = ( p_ext->p_sys->i_capabilities & EXT_HAS_MENU ) ? 1 : 0;
454 case EXTENSION_GET_MENU:
455 p_ext = ( extension_t* ) va_arg( args, extension_t* );
456 pppsz = ( char*** ) va_arg( args, char*** );
457 ppus = ( uint16_t** ) va_arg( args, uint16_t** );
458 return GetMenuEntries( p_mgr, p_ext, pppsz, ppus );
460 case EXTENSION_TRIGGER_ONLY:
461 p_ext = ( extension_t* ) va_arg( args, extension_t* );
462 pb = ( bool* ) va_arg( args, bool* );
463 *pb = ( p_ext->p_sys->i_capabilities & EXT_TRIGGER_ONLY ) ? 1 : 0;
466 case EXTENSION_TRIGGER:
467 p_ext = ( extension_t* ) va_arg( args, extension_t* );
468 return TriggerExtension( p_mgr, p_ext );
470 case EXTENSION_TRIGGER_MENU:
471 p_ext = ( extension_t* ) va_arg( args, extension_t* );
472 // GCC: 'uint16_t' is promoted to 'int' when passed through '...'
473 i = ( int ) va_arg( args, int );
474 return TriggerMenu( p_ext, i );
476 case EXTENSION_SET_INPUT:
478 p_ext = ( extension_t* ) va_arg( args, extension_t* );
479 input_thread_t *p_input = va_arg( args, struct input_thread_t * );
481 if( !LockExtension( p_ext ) )
485 input_thread_t *old = p_ext->p_sys->p_input;
486 input_item_t *p_item;
489 // Untrack meta fetched events
490 if( p_ext->p_sys->i_capabilities & EXT_META_LISTENER )
492 p_item = input_GetItem( old );
493 vlc_event_detach( &p_item->event_manager,
494 vlc_InputItemMetaChanged,
495 inputItemMetaChanged,
497 vlc_gc_decref( p_item );
499 vlc_object_release( old );
502 p_ext->p_sys->p_input = p_input ? vlc_object_hold( p_input )
505 // Tell the script the input changed
506 if( p_ext->p_sys->i_capabilities & EXT_INPUT_LISTENER )
508 PushCommandUnique( p_ext, CMD_SET_INPUT );
511 // Track meta fetched events
512 if( p_ext->p_sys->p_input &&
513 p_ext->p_sys->i_capabilities & EXT_META_LISTENER )
515 p_item = input_GetItem( p_ext->p_sys->p_input );
516 vlc_gc_incref( p_item );
517 vlc_event_attach( &p_item->event_manager,
518 vlc_InputItemMetaChanged,
519 inputItemMetaChanged,
523 UnlockExtension( p_ext );
528 msg_Warn( p_mgr, "Control '%d' not yet implemented in Extension",
536 int lua_ExtensionActivate( extensions_manager_t *p_mgr, extension_t *p_ext )
538 assert( p_mgr != NULL && p_ext != NULL );
539 return lua_ExecuteFunction( p_mgr, p_ext, "activate" );
542 int lua_ExtensionDeactivate( extensions_manager_t *p_mgr, extension_t *p_ext )
544 assert( p_mgr != NULL && p_ext != NULL );
546 if( !p_ext->p_sys->L )
549 // Unset and release input objects
550 if( p_ext->p_sys->p_input )
552 if( p_ext->p_sys->i_capabilities & EXT_META_LISTENER )
555 input_item_t *p_item = input_GetItem( p_ext->p_sys->p_input );
556 vlc_gc_decref( p_item );
558 vlc_object_release( p_ext->p_sys->p_input );
561 int i_ret = lua_ExecuteFunction( p_mgr, p_ext, "deactivate" );
563 /* Clear Lua State */
564 lua_close( p_ext->p_sys->L );
565 p_ext->p_sys->L = NULL;
570 int lua_ExtensionWidgetClick( extensions_manager_t *p_mgr,
572 extension_widget_t *p_widget )
574 if( !p_ext->p_sys->L )
577 return lua_ExecuteFunction( p_mgr, p_ext, (const char*) p_widget->p_sys );
582 * Get the list of menu entries from an extension script
585 * @param pppsz_titles Pointer to NULL. All strings must be freed by the caller
586 * @param ppi_ids Pointer to NULL. Must be feed by the caller.
587 * @note This function is allowed to run in the UI thread. This means
588 * that it MUST respond very fast.
589 * @todo Remove the menu() hook and provide a new function vlc.set_menu()
591 static int GetMenuEntries( extensions_manager_t *p_mgr, extension_t *p_ext,
592 char ***pppsz_titles, uint16_t **ppi_ids )
594 assert( *pppsz_titles == NULL );
595 assert( *ppi_ids == NULL );
597 if( !IsActivated( p_mgr, p_ext ) )
599 msg_Dbg( p_mgr, "Can't get menu before activating the extension!" );
603 if( !LockExtension( p_ext ) )
605 /* Dying extension, fail. */
609 int i_ret = VLC_EGENERIC;
610 lua_State *L = GetLuaState( p_mgr, p_ext );
612 if( ( p_ext->p_sys->i_capabilities & EXT_HAS_MENU ) == 0 )
614 msg_Dbg( p_mgr, "can't get a menu from an extension without menu!" );
618 lua_getglobal( L, "menu" );
620 if( !lua_isfunction( L, -1 ) )
622 msg_Warn( p_mgr, "Error while runing script %s, "
623 "function menu() not found", p_ext->psz_name );
627 if( lua_pcall( L, 0, 1, 0 ) )
629 msg_Warn( p_mgr, "Error while runing script %s, "
630 "function menu(): %s", p_ext->psz_name,
631 lua_tostring( L, lua_gettop( L ) ) );
635 if( lua_gettop( L ) )
637 if( lua_istable( L, -1 ) )
640 size_t i_size = lua_objlen( L, -1 );
641 *pppsz_titles = ( char** ) calloc( i_size+1, sizeof( char* ) );
642 *ppi_ids = ( uint16_t* ) calloc( i_size+1, sizeof( uint16_t ) );
647 while( lua_next( L, -2 ) != 0 )
649 assert( i_idx < i_size );
650 if( (!lua_isstring( L, -1 )) || (!lua_isnumber( L, -2 )) )
652 msg_Warn( p_mgr, "In script %s, an entry in "
653 "the menu table is invalid!", p_ext->psz_name );
656 (*pppsz_titles)[ i_idx ] = strdup( luaL_checkstring( L, -1 ) );
657 (*ppi_ids)[ i_idx ] = (uint16_t) ( luaL_checkinteger( L, -2 ) & 0xFFFF );
664 msg_Warn( p_mgr, "Function menu() in script %s "
665 "did not return a table", p_ext->psz_name );
671 msg_Warn( p_mgr, "Script %s went completely foobar", p_ext->psz_name );
678 UnlockExtension( p_ext );
679 if( i_ret != VLC_SUCCESS )
681 msg_Dbg( p_mgr, "Something went wrong in %s (%s:%d)",
682 __func__, __FILE__, __LINE__ );
687 /* Must be entered with the Lock on Extension */
688 static lua_State* GetLuaState( extensions_manager_t *p_mgr,
700 msg_Err( p_mgr, "Could not create new Lua State" );
704 luaL_register( L, "vlc", p_reg );
707 lua_pushlightuserdata( L, p_mgr );
708 lua_setfield( L, -2, "private" );
710 lua_pushlightuserdata( L, p_ext );
711 lua_setfield( L, -2, "extension" );
715 /* Load more libraries */
718 luaopen_dialog( L, p_ext );
725 luaopen_playlist( L );
728 luaopen_strings( L );
729 luaopen_variables( L );
734 /* Register extension specific functions */
735 lua_getglobal( L, "vlc" );
736 lua_pushcfunction( L, vlclua_extension_deactivate );
737 lua_setfield( L, -2, "deactivate" );
739 /* Load and run the script(s) */
740 if( luaL_dofile( L, p_ext->psz_name ) != 0 )
742 msg_Warn( p_mgr, "Error loading script %s: %s", p_ext->psz_name,
743 lua_tostring( L, lua_gettop( L ) ) );
754 msg_Dbg( p_mgr, "Reusing old Lua state for extension '%s'",
763 * Execute a function in a Lua script
764 * @return < 0 in case of failure, >= 0 in case of success
765 * @note It's better to call this function from a dedicated thread
766 * (see extension_thread.c)
768 int lua_ExecuteFunction( extensions_manager_t *p_mgr,
770 const char *psz_function )
772 int i_ret = VLC_EGENERIC;
773 assert( p_mgr != NULL );
774 assert( p_ext != NULL );
776 lua_State *L = GetLuaState( p_mgr, p_ext );
777 lua_getglobal( L, psz_function );
779 if( !lua_isfunction( L, -1 ) )
781 msg_Warn( p_mgr, "Error while runing script %s, "
782 "function %s() not found", p_ext->psz_name, psz_function );
786 if( lua_pcall( L, 0, 1, 0 ) )
788 msg_Warn( p_mgr, "Error while runing script %s, "
789 "function %s(): %s", p_ext->psz_name, psz_function,
790 lua_tostring( L, lua_gettop( L ) ) );
799 static inline int TriggerMenu( extension_t *p_ext, int i_id )
801 return PushCommand( p_ext, CMD_TRIGGERMENU, i_id );
804 int lua_ExtensionTriggerMenu( extensions_manager_t *p_mgr,
805 extension_t *p_ext, int id )
807 int i_ret = VLC_EGENERIC;
808 lua_State *L = GetLuaState( p_mgr, p_ext );
813 luaopen_dialog( L, p_ext );
815 lua_getglobal( L, "trigger_menu" );
816 if( !lua_isfunction( L, -1 ) )
818 msg_Warn( p_mgr, "Error while runing script %s, "
819 "function trigger_menu() not found", p_ext->psz_name );
823 /* Pass id as unique argument to the function */
824 lua_pushinteger( L, id );
826 if( lua_pcall( L, 1, 1, 0 ) != 0 )
828 msg_Warn( p_mgr, "Error while runing script %s, "
829 "function trigger_menu(): %s", p_ext->psz_name,
830 lua_tostring( L, lua_gettop( L ) ) );
834 if( i_ret < VLC_SUCCESS )
836 msg_Dbg( p_mgr, "Something went wrong in %s (%s:%d)",
837 __func__, __FILE__, __LINE__ );
842 /** Directly trigger an extension, without activating it
843 * This is NOT multithreaded, and this code runs in the UI thread
845 * @param p_ext Extension to trigger
846 * @return Value returned by the lua function "trigger"
848 static int TriggerExtension( extensions_manager_t *p_mgr,
851 int i_ret = lua_ExecuteFunction( p_mgr, p_ext, "trigger" );
853 /* Close lua state for trigger-only extensions */
854 if( p_ext->p_sys->L )
855 lua_close( p_ext->p_sys->L );
856 p_ext->p_sys->L = NULL;
861 /** Retrieve extension associated to the current script
862 * @param L current lua_State
863 * @return Lua userdata "vlc.extension"
865 extension_t *vlclua_extension_get( lua_State *L )
867 extension_t *p_ext = NULL;
868 lua_getglobal( L, "vlc" );
869 lua_getfield( L, -1, "extension" );
870 p_ext = (extension_t*) lua_topointer( L, lua_gettop( L ) );
875 /** Deactivate an extension by order from the extension itself
877 * @note This is an asynchronous call. A script calling vlc.deactivate() will
878 * be executed to the end before the last call to deactivate() is done.
880 int vlclua_extension_deactivate( lua_State *L )
882 extension_t *p_ext = vlclua_extension_get( L );
883 int i_ret = Deactivate( p_ext->p_sys->p_mgr, p_ext );
884 return ( i_ret == VLC_SUCCESS ) ? 1 : 0;
887 /** Callback for the variable "dialog-event"
888 * @param p_this Current object owner of the extension and the dialog
889 * @param psz_var "dialog-event"
890 * @param oldval Unused
891 * @param newval Address of the dialog
892 * @param p_data Unused
894 static int vlclua_extension_dialog_callback( vlc_object_t *p_this,
900 /* psz_var == "dialog-event" */
905 extension_dialog_command_t *command = newval.p_address;
906 assert( command != NULL );
907 assert( command->p_dlg != NULL);
909 extension_t *p_ext = command->p_dlg->p_sys;
910 assert( p_ext != NULL );
912 extension_widget_t *p_widget = command->p_data;
914 switch( command->event )
916 case EXTENSION_EVENT_CLICK:
917 assert( p_widget != NULL );
918 PushCommand( p_ext, CMD_CLICK, p_widget );
920 case EXTENSION_EVENT_CLOSE:
921 PushCommandUnique( p_ext, CMD_CLOSE );
924 msg_Dbg( p_this, "Received unknown UI event %d, discarded",
932 /** Callback on vlc_InputItemMetaChanged event
934 static void inputItemMetaChanged( const vlc_event_t *p_event,
937 assert( p_event && p_event->type == vlc_InputItemMetaChanged );
939 extension_t *p_ext = ( extension_t* ) data;
940 assert( p_ext != NULL );
942 PushCommandUnique( p_ext, CMD_UPDATE_META );
945 /* Lock this extension. Can fail. */
946 bool LockExtension( extension_t *p_ext )
948 if( p_ext->p_sys->b_exiting )
951 vlc_mutex_lock( &p_ext->p_sys->running_lock );
952 if( p_ext->p_sys->b_exiting )
954 vlc_mutex_unlock( &p_ext->p_sys->running_lock );
961 void UnlockExtension( extension_t *p_ext )
963 vlc_mutex_unlock( &p_ext->p_sys->running_lock );