src/libvlc.c

   1 /*****************************************************************************
   2  * libvlc.c: libvlc instances creation and deletion, interfaces handling
   3  *****************************************************************************
   4  * Copyright (C) 1998-2008 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Vincent Seguin <seguin@via.ecp.fr>
   8  *          Samuel Hocevar <sam@zoy.org>
   9  *          Gildas Bazin <gbazin@videolan.org>
  10  *          Derk-Jan Hartman <hartman at videolan dot org>
  11  *          Rémi Denis-Courmont <rem # videolan : org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU Lesser General Public License as published by
  15  * the Free Software Foundation; either version 2.1 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  21  * GNU Lesser General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU Lesser General Public License
  24  * along with this program; if not, write to the Free Software Foundation,
  25  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  26  *****************************************************************************/
  27
  28 /** \file
  29  * This file contains functions to create and destroy libvlc instances
  30  */
  31
  32 /*****************************************************************************
  33  * Preamble
  34  *****************************************************************************/
  35 #ifdef HAVE_CONFIG_H
  36 # include "config.h"
  37 #endif
  38
  39 #include <vlc_common.h>
  40 #include "../lib/libvlc_internal.h"
  41 #include <vlc_input.h>
  42
  43 #include "modules/modules.h"
  44 #include "config/configuration.h"
  45 #include "playlist/preparser.h"
  46
  47 #include <stdio.h>                                              /* sprintf() */
  48 #include <string.h>
  49 #include <stdlib.h>                                                /* free() */
  50 #include <errno.h>
  51
  52 #include "config/vlc_getopt.h"
  53
  54 #ifdef HAVE_DBUS
  55 /* used for one-instance mode */
  56 #   include <dbus/dbus.h>
  57 #endif
  58
  59
  60 #include <vlc_playlist.h>
  61 #include <vlc_interface.h>
  62
  63 #include <vlc_charset.h>
  64 #include <vlc_dialog.h>
  65 #include <vlc_keystore.h>
  66 #include <vlc_fs.h>
  67 #include <vlc_cpu.h>
  68 #include <vlc_url.h>
  69 #include <vlc_modules.h>
  70
  71 #include "libvlc.h"
  72 #include "playlist/playlist_internal.h"
  73 #include "misc/variables.h"
  74
  75 #include <vlc_vlm.h>
  76
  77 #ifdef __APPLE__
  78 # include <libkern/OSAtomic.h>
  79 #endif
  80
  81 #include <assert.h>
  82
  83 /*****************************************************************************
  84  * Local prototypes
  85  *****************************************************************************/
  86 static void GetFilenames  ( libvlc_int_t *, unsigned, const char *const [] );
  87
  88 /**
  89  * Allocate a blank libvlc instance, also setting the exit handler.
  90  * Vlc's threading system must have been initialized first
  91  */
  92 libvlc_int_t * libvlc_InternalCreate( void )
  93 {
  94     libvlc_int_t *p_libvlc;
  95     libvlc_priv_t *priv;
  96
  97     /* Allocate a libvlc instance object */
  98     p_libvlc = (vlc_custom_create)( NULL, sizeof (*priv), "libvlc" );
  99     if( p_libvlc == NULL )
 100         return NULL;
 101
 102     priv = libvlc_priv (p_libvlc);
 103     priv->playlist = NULL;
 104     priv->p_vlm = NULL;
 105
 106     vlc_ExitInit( &priv->exit );
 107
 108     return p_libvlc;
 109 }
 110
 111 /**
 112  * Initialize a libvlc instance
 113  * This function initializes a previously allocated libvlc instance:
 114  *  - CPU detection
 115  *  - gettext initialization
 116  *  - message queue, module bank and playlist initialization
 117  *  - configuration and commandline parsing
 118  */
 119 int libvlc_InternalInit( libvlc_int_t *p_libvlc, int i_argc,
 120                          const char *ppsz_argv[] )
 121 {
 122     libvlc_priv_t *priv = libvlc_priv (p_libvlc);
 123     char *       psz_modules = NULL;
 124     char *       psz_parser = NULL;
 125     char *       psz_control = NULL;
 126     char        *psz_val;
 127     int          i_ret = VLC_EGENERIC;
 128
 129     /* System specific initialization code */
 130     system_Init();
 131
 132     vlc_LogPreinit(p_libvlc);
 133
 134     /* Initialize the module bank and load the configuration of the
 135      * core module. We need to do this at this stage to be able to display
 136      * a short help if required by the user. (short help == core module
 137      * options) */
 138     module_InitBank ();
 139
 140     /* Get command line options that affect module loading. */
 141     if( config_LoadCmdLine( p_libvlc, i_argc, ppsz_argv, NULL ) )
 142     {
 143         module_EndBank (false);
 144         return VLC_EGENERIC;
 145     }
 146
 147     vlc_threads_setup (p_libvlc);
 148
 149     /* Load the builtins and plugins into the module_bank.
 150      * We have to do it before config_Load*() because this also gets the
 151      * list of configuration options exported by each module and loads their
 152      * default values. */
 153     size_t module_count = module_LoadPlugins (p_libvlc);
 154
 155     /*
 156      * Override default configuration with config file settings
 157      */
 158     if( !var_InheritBool( p_libvlc, "ignore-config" ) )
 159     {
 160         if( var_InheritBool( p_libvlc, "reset-config" ) )
 161             config_SaveConfigFile( p_libvlc ); /* Save default config */
 162         else
 163             config_LoadConfigFile( p_libvlc );
 164     }
 165
 166     /*
 167      * Override configuration with command line settings
 168      */
 169     int vlc_optind;
 170     if( config_LoadCmdLine( p_libvlc, i_argc, ppsz_argv, &vlc_optind ) )
 171         goto error;
 172
 173     vlc_LogInit(p_libvlc);
 174
 175     /*
 176      * Support for gettext
 177      */
 178 #if defined( ENABLE_NLS ) \
 179      && ( defined( HAVE_GETTEXT ) || defined( HAVE_INCLUDED_GETTEXT ) )
 180     vlc_bindtextdomain (PACKAGE_NAME);
 181 #endif
 182     /*xgettext: Translate "C" to the language code: "fr", "en_GB", "nl", "ru"... */
 183     msg_Dbg( p_libvlc, "translation test: code is \"%s\"", _("C") );
 184
 185     if (config_PrintHelp (VLC_OBJECT(p_libvlc)))
 186     {
 187         libvlc_InternalCleanup (p_libvlc);
 188         exit(0);
 189     }
 190
 191     if( module_count <= 1 )
 192     {
 193         msg_Err( p_libvlc, "No plugins found! Check your VLC installation.");
 194         i_ret = VLC_ENOMOD;
 195         goto error;
 196     }
 197
 198 #ifdef HAVE_DAEMON
 199     /* Check for daemon mode */
 200     if( var_InheritBool( p_libvlc, "daemon" ) )
 201     {
 202         if( daemon( 1, 0) != 0 )
 203         {
 204             msg_Err( p_libvlc, "Unable to fork vlc to daemon mode" );
 205             goto error;
 206         }
 207
 208         /* lets check if we need to write the pidfile */
 209         char *pidfile = var_InheritString( p_libvlc, "pidfile" );
 210         if( pidfile != NULL )
 211         {
 212             FILE *stream = vlc_fopen( pidfile, "w" );
 213             if( stream != NULL )
 214             {
 215                 fprintf( stream, "%d", (int)getpid() );
 216                 fclose( stream );
 217                 msg_Dbg( p_libvlc, "written PID file %s", pidfile );
 218             }
 219             else
 220                 msg_Err( p_libvlc, "cannot write PID file %s: %s",
 221                          pidfile, vlc_strerror_c(errno) );
 222             free( pidfile );
 223         }
 224     }
 225     else
 226     {
 227         var_Create( p_libvlc, "pidfile", VLC_VAR_STRING );
 228         var_SetString( p_libvlc, "pidfile", "" );
 229     }
 230 #endif
 231
 232     i_ret = VLC_ENOMEM;
 233
 234     if( libvlc_InternalDialogInit( p_libvlc ) != VLC_SUCCESS )
 235         goto error;
 236     if( libvlc_InternalKeystoreInit( p_libvlc ) != VLC_SUCCESS )
 237         msg_Warn( p_libvlc, "memory keystore init failed" );
 238
 239 /* FIXME: could be replaced by using Unix sockets */
 240 #ifdef HAVE_DBUS
 241
 242 #define MPRIS_APPEND "/org/mpris/MediaPlayer2/TrackList/Append"
 243 #define MPRIS_BUS_NAME "org.mpris.MediaPlayer2.vlc"
 244 #define MPRIS_OBJECT_PATH "/org/mpris/MediaPlayer2"
 245 #define MPRIS_TRACKLIST_INTERFACE "org.mpris.MediaPlayer2.TrackList"
 246
 247     if( var_InheritBool( p_libvlc, "one-instance" )
 248     || ( var_InheritBool( p_libvlc, "one-instance-when-started-from-file" )
 249       && var_InheritBool( p_libvlc, "started-from-file" ) ) )
 250     {
 251         for( int i = vlc_optind; i < i_argc; i++ )
 252             if( ppsz_argv[i][0] == ':' )
 253             {
 254                 msg_Err( p_libvlc, "item option %s incompatible with single instance",
 255                          ppsz_argv[i] );
 256                 goto dbus_out;
 257             }
 258
 259         /* Initialise D-Bus interface, check for other instances */
 260         dbus_threads_init_default();
 261
 262         DBusError err;
 263         dbus_error_init( &err );
 264
 265         /* connect to the session bus */
 266         DBusConnection  *conn = dbus_bus_get( DBUS_BUS_SESSION, &err );
 267         if( conn == NULL )
 268         {
 269             msg_Err( p_libvlc, "Failed to connect to D-Bus session daemon: %s",
 270                     err.message );
 271             dbus_error_free( &err );
 272             goto dbus_out;
 273         }
 274
 275         /* check if VLC is available on the bus
 276          * if not: D-Bus control is not enabled on the other
 277          * instance and we can't pass MRLs to it */
 278         /* FIXME: This check is totally brain-dead and buggy. */
 279         if( !dbus_bus_name_has_owner( conn, MPRIS_BUS_NAME, &err ) )
 280         {
 281             dbus_connection_unref( conn );
 282             if( dbus_error_is_set( &err ) )
 283             {
 284                 msg_Err( p_libvlc, "D-Bus error: %s", err.message );
 285             }
 286             else
 287                 msg_Dbg( p_libvlc, "No media player running. Continuing normally." );
 288             dbus_error_free( &err );
 289             goto dbus_out;
 290         }
 291
 292         const dbus_bool_t play = !var_InheritBool( p_libvlc, "playlist-enqueue" );
 293
 294         msg_Warn( p_libvlc, "media player running. Exiting...");
 295         for( int i = vlc_optind; i < i_argc; i++ )
 296         {
 297             DBusMessage *msg = dbus_message_new_method_call(
 298                MPRIS_BUS_NAME, MPRIS_OBJECT_PATH, MPRIS_TRACKLIST_INTERFACE, "AddTrack" );
 299             if( unlikely(msg == NULL) )
 300                 continue;
 301
 302             /* We need to resolve relative paths in this instance */
 303             char *mrl;
 304             if( strstr( ppsz_argv[i], "://" ) )
 305                 mrl = strdup( ppsz_argv[i] );
 306             else
 307                 mrl = vlc_path2uri( ppsz_argv[i], NULL );
 308             if( mrl == NULL )
 309             {
 310                 dbus_message_unref( msg );
 311                 continue;
 312             }
 313
 314             const char *after_track = MPRIS_APPEND;
 315
 316             /* append MRLs */
 317             if( !dbus_message_append_args( msg, DBUS_TYPE_STRING, &mrl,
 318                                                 DBUS_TYPE_OBJECT_PATH, &after_track,
 319                                                 DBUS_TYPE_BOOLEAN, &play,
 320                                                 DBUS_TYPE_INVALID ) )
 321             {
 322                  dbus_message_unref( msg );
 323                  msg = NULL;
 324                  free( mrl );
 325                  continue;
 326             }
 327
 328             msg_Dbg( p_libvlc, "Adds %s to the running media player", mrl );
 329             free( mrl );
 330
 331             /* send message and get a handle for a reply */
 332             DBusMessage *reply = dbus_connection_send_with_reply_and_block( conn, msg, -1,
 333                                                                             &err );
 334             dbus_message_unref( msg );
 335             if( reply == NULL )
 336             {
 337                 msg_Err( p_libvlc, "D-Bus error: %s", err.message );
 338                 continue;
 339             }
 340             dbus_message_unref( reply );
 341         }
 342         /* we unreference the connection when we've finished with it */
 343         dbus_connection_unref( conn );
 344         exit( 0 );
 345     }
 346 #undef MPRIS_APPEND
 347 #undef MPRIS_BUS_NAME
 348 #undef MPRIS_OBJECT_PATH
 349 #undef MPRIS_TRACKLIST_INTERFACE
 350 dbus_out:
 351 #endif // HAVE_DBUS
 352
 353     vlc_CPU_dump( VLC_OBJECT(p_libvlc) );
 354
 355     priv->b_stats = var_InheritBool( p_libvlc, "stats" );
 356
 357     /*
 358      * Initialize hotkey handling
 359      */
 360     priv->actions = vlc_InitActions( p_libvlc );
 361     if( !priv->actions )
 362         goto error;
 363
 364     /*
 365      * Meta data handling
 366      */
 367     priv->parser = playlist_preparser_New(VLC_OBJECT(p_libvlc));
 368     if( !priv->parser )
 369         goto error;
 370
 371     /* Create a variable for showing the fullscreen interface */
 372     var_Create( p_libvlc, "intf-toggle-fscontrol", VLC_VAR_BOOL );
 373     var_SetBool( p_libvlc, "intf-toggle-fscontrol", true );
 374
 375     /* Create a variable for the Boss Key */
 376     var_Create( p_libvlc, "intf-boss", VLC_VAR_VOID );
 377
 378     /* Create a variable for showing the main interface */
 379     var_Create( p_libvlc, "intf-show", VLC_VAR_BOOL );
 380
 381     /* Create a variable for showing the right click menu */
 382     var_Create( p_libvlc, "intf-popupmenu", VLC_VAR_BOOL );
 383
 384     /* variables for signalling creation of new files */
 385     var_Create( p_libvlc, "snapshot-file", VLC_VAR_STRING );
 386     var_Create( p_libvlc, "record-file", VLC_VAR_STRING );
 387
 388     /* some default internal settings */
 389     var_Create( p_libvlc, "window", VLC_VAR_STRING );
 390     /* NOTE: Because the playlist and interfaces start before this function
 391      * returns control to the application (DESIGN BUG!), all these variables
 392      * must be created (in place of libvlc_new()) and set to VLC defaults
 393      * (in place of VLC main()) *here*. */
 394     var_Create( p_libvlc, "user-agent", VLC_VAR_STRING );
 395     var_SetString( p_libvlc, "user-agent",
 396                    "VLC media player (LibVLC "VERSION")" );
 397     var_Create( p_libvlc, "http-user-agent", VLC_VAR_STRING );
 398     var_SetString( p_libvlc, "http-user-agent",
 399                    "VLC/"PACKAGE_VERSION" LibVLC/"PACKAGE_VERSION );
 400     var_Create( p_libvlc, "app-icon-name", VLC_VAR_STRING );
 401     var_SetString( p_libvlc, "app-icon-name", PACKAGE_NAME );
 402     var_Create( p_libvlc, "app-id", VLC_VAR_STRING );
 403     var_SetString( p_libvlc, "app-id", "org.VideoLAN.VLC" );
 404     var_Create( p_libvlc, "app-version", VLC_VAR_STRING );
 405     var_SetString( p_libvlc, "app-version", PACKAGE_VERSION );
 406
 407     /* System specific configuration */
 408     system_Configure( p_libvlc, i_argc - vlc_optind, ppsz_argv + vlc_optind );
 409
 410 #ifdef ENABLE_VLM
 411     /* Initialize VLM if vlm-conf is specified */
 412     psz_parser = var_CreateGetNonEmptyString( p_libvlc, "vlm-conf" );
 413     if( psz_parser )
 414     {
 415         priv->p_vlm = vlm_New( p_libvlc );
 416         if( !priv->p_vlm )
 417             msg_Err( p_libvlc, "VLM initialization failed" );
 418     }
 419     free( psz_parser );
 420 #endif
 421
 422     /*
 423      * Load background interfaces
 424      */
 425     psz_modules = var_CreateGetNonEmptyString( p_libvlc, "extraintf" );
 426     psz_control = var_CreateGetNonEmptyString( p_libvlc, "control" );
 427
 428     if( psz_modules && psz_control )
 429     {
 430         char* psz_tmp;
 431         if( asprintf( &psz_tmp, "%s:%s", psz_modules, psz_control ) != -1 )
 432         {
 433             free( psz_modules );
 434             psz_modules = psz_tmp;
 435         }
 436     }
 437     else if( psz_control )
 438     {
 439         free( psz_modules );
 440         psz_modules = strdup( psz_control );
 441     }
 442
 443     psz_parser = psz_modules;
 444     while ( psz_parser && *psz_parser )
 445     {
 446         char *psz_module, *psz_temp;
 447         psz_module = psz_parser;
 448         psz_parser = strchr( psz_module, ':' );
 449         if ( psz_parser )
 450         {
 451             *psz_parser = '\0';
 452             psz_parser++;
 453         }
 454         if( asprintf( &psz_temp, "%s,none", psz_module ) != -1)
 455         {
 456             libvlc_InternalAddIntf( p_libvlc, psz_temp );
 457             free( psz_temp );
 458         }
 459     }
 460     free( psz_modules );
 461     free( psz_control );
 462
 463     if( var_InheritBool( p_libvlc, "network-synchronisation") )
 464         libvlc_InternalAddIntf( p_libvlc, "netsync,none" );
 465
 466 #ifdef __APPLE__
 467     var_Create( p_libvlc, "drawable-view-top", VLC_VAR_INTEGER );
 468     var_Create( p_libvlc, "drawable-view-left", VLC_VAR_INTEGER );
 469     var_Create( p_libvlc, "drawable-view-bottom", VLC_VAR_INTEGER );
 470     var_Create( p_libvlc, "drawable-view-right", VLC_VAR_INTEGER );
 471     var_Create( p_libvlc, "drawable-clip-top", VLC_VAR_INTEGER );
 472     var_Create( p_libvlc, "drawable-clip-left", VLC_VAR_INTEGER );
 473     var_Create( p_libvlc, "drawable-clip-bottom", VLC_VAR_INTEGER );
 474     var_Create( p_libvlc, "drawable-clip-right", VLC_VAR_INTEGER );
 475     var_Create( p_libvlc, "drawable-nsobject", VLC_VAR_ADDRESS );
 476 #endif
 477
 478     /*
 479      * Get input filenames given as commandline arguments.
 480      * We assume that the remaining parameters are filenames
 481      * and their input options.
 482      */
 483     GetFilenames( p_libvlc, i_argc - vlc_optind, ppsz_argv + vlc_optind );
 484
 485     /*
 486      * Get --open argument
 487      */
 488     psz_val = var_InheritString( p_libvlc, "open" );
 489     if ( psz_val != NULL )
 490     {
 491         intf_InsertItem( p_libvlc, psz_val, 0, NULL, 0 );
 492         free( psz_val );
 493     }
 494
 495     return VLC_SUCCESS;
 496
 497 error:
 498     libvlc_InternalCleanup( p_libvlc );
 499     return i_ret;
 500 }
 501
 502 /**
 503  * Cleanup a libvlc instance. The instance is not completely deallocated
 504  * \param p_libvlc the instance to clean
 505  */
 506 void libvlc_InternalCleanup( libvlc_int_t *p_libvlc )
 507 {
 508     libvlc_priv_t *priv = libvlc_priv (p_libvlc);
 509
 510     /* Ask the interfaces to stop and destroy them */
 511     msg_Dbg( p_libvlc, "removing all interfaces" );
 512     intf_DestroyAll( p_libvlc );
 513
 514     libvlc_InternalDialogClean( p_libvlc );
 515     libvlc_InternalKeystoreClean( p_libvlc );
 516
 517 #ifdef ENABLE_VLM
 518     /* Destroy VLM if created in libvlc_InternalInit */
 519     if( priv->p_vlm )
 520     {
 521         vlm_Delete( priv->p_vlm );
 522     }
 523 #endif
 524
 525 #if !defined( _WIN32 ) && !defined( __OS2__ )
 526     char *pidfile = var_InheritString( p_libvlc, "pidfile" );
 527     if( pidfile != NULL )
 528     {
 529         msg_Dbg( p_libvlc, "removing PID file %s", pidfile );
 530         if( unlink( pidfile ) )
 531             msg_Warn( p_libvlc, "cannot remove PID file %s: %s",
 532                       pidfile, vlc_strerror_c(errno) );
 533         free( pidfile );
 534     }
 535 #endif
 536
 537     if (priv->parser != NULL)
 538         playlist_preparser_Delete(priv->parser);
 539
 540     vlc_DeinitActions( p_libvlc, priv->actions );
 541
 542     /* Save the configuration */
 543     if( !var_InheritBool( p_libvlc, "ignore-config" ) )
 544         config_AutoSaveConfigFile( VLC_OBJECT(p_libvlc) );
 545
 546     /* Free module bank. It is refcounted, so we call this each time  */
 547     vlc_LogDeinit (p_libvlc);
 548     module_EndBank (true);
 549 #if defined(_WIN32) || defined(__OS2__)
 550     system_End( );
 551 #endif
 552 }
 553
 554 /**
 555  * Destroy everything.
 556  * This function requests the running threads to finish, waits for their
 557  * termination, and destroys their structure.
 558  * It stops the thread systems: no instance can run after this has run
 559  * \param p_libvlc the instance to destroy
 560  */
 561 void libvlc_InternalDestroy( libvlc_int_t *p_libvlc )
 562 {
 563     libvlc_priv_t *priv = libvlc_priv( p_libvlc );
 564
 565     vlc_ExitDestroy( &priv->exit );
 566
 567     assert( atomic_load(&(vlc_internals(p_libvlc)->refs)) == 1 );
 568     vlc_object_release( p_libvlc );
 569 }
 570
 571 /*****************************************************************************
 572  * GetFilenames: parse command line options which are not flags
 573  *****************************************************************************
 574  * Parse command line for input files as well as their associated options.
 575  * An option always follows its associated input and begins with a ":".
 576  *****************************************************************************/
 577 static void GetFilenames( libvlc_int_t *p_vlc, unsigned n,
 578                           const char *const args[] )
 579 {
 580     while( n > 0 )
 581     {
 582         /* Count the input options */
 583         unsigned i_options = 0;
 584
 585         while( args[--n][0] == ':' )
 586         {
 587             i_options++;
 588             if( n == 0 )
 589             {
 590                 msg_Warn( p_vlc, "options %s without item", args[n] );
 591                 return; /* syntax!? */
 592             }
 593         }
 594
 595         char *mrl = NULL;
 596         if( strstr( args[n], "://" ) == NULL )
 597         {
 598             mrl = vlc_path2uri( args[n], NULL );
 599             if( !mrl )
 600                 continue;
 601         }
 602
 603         intf_InsertItem( p_vlc, (mrl != NULL) ? mrl : args[n], i_options,
 604                          ( i_options ? &args[n + 1] : NULL ),
 605                          VLC_INPUT_OPTION_TRUSTED );
 606         free( mrl );
 607     }
 608 }
 609
 610 /**
 611  * Requests extraction of the meta data for an input item (a.k.a. preparsing).
 612  * The actual extraction is asynchronous. It can be cancelled with
 613  * libvlc_MetadataCancel()
 614  */
 615 int libvlc_MetadataRequest(libvlc_int_t *libvlc, input_item_t *item,
 616                            input_item_meta_request_option_t i_options,
 617                            int timeout, void *id)
 618 {
 619     libvlc_priv_t *priv = libvlc_priv(libvlc);
 620
 621     if (unlikely(priv->parser == NULL))
 622         return VLC_ENOMEM;
 623
 624     vlc_mutex_lock( &item->lock );
 625     if( item->i_preparse_depth == 0 )
 626         item->i_preparse_depth = 1;
 627     if( i_options & META_REQUEST_OPTION_DO_INTERACT )
 628         item->b_preparse_interact = true;
 629     vlc_mutex_unlock( &item->lock );
 630     playlist_preparser_Push( priv->parser, item, i_options, timeout, id );
 631     return VLC_SUCCESS;
 632 }
 633
 634 /**
 635  * Requests retrieving/downloading art for an input item.
 636  * The retrieval is performed asynchronously.
 637  */
 638 int libvlc_ArtRequest(libvlc_int_t *libvlc, input_item_t *item,
 639                       input_item_meta_request_option_t i_options)
 640 {
 641     libvlc_priv_t *priv = libvlc_priv(libvlc);
 642
 643     if (unlikely(priv->parser == NULL))
 644         return VLC_ENOMEM;
 645
 646     playlist_preparser_fetcher_Push(priv->parser, item, i_options);
 647     return VLC_SUCCESS;
 648 }
 649
 650 /**
 651  * Cancels extraction of the meta data for an input item.
 652  *
 653  * This does nothing if the input item is already processed or if it was not
 654  * added with libvlc_MetadataRequest()
 655  */
 656 void libvlc_MetadataCancel(libvlc_int_t *libvlc, void *id)
 657 {
 658     libvlc_priv_t *priv = libvlc_priv(libvlc);
 659
 660     if (unlikely(priv->parser == NULL))
 661         return;
 662
 663     playlist_preparser_Cancel(priv->parser, id);
 664 }