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_fs.h>
  65 #include <vlc_cpu.h>
  66 #include <vlc_url.h>
  67 #include <vlc_modules.h>
  68
  69 #include "libvlc.h"
  70 #include "playlist/playlist_internal.h"
  71 #include "misc/variables.h"
  72
  73 #include <vlc_vlm.h>
  74
  75 #ifdef __APPLE__
  76 # include <libkern/OSAtomic.h>
  77 #endif
  78
  79 #include <assert.h>
  80
  81 /*****************************************************************************
  82  * Local prototypes
  83  *****************************************************************************/
  84 static void GetFilenames  ( libvlc_int_t *, unsigned, const char *const [] );
  85
  86 /**
  87  * Allocate a libvlc instance, initialize global data if needed
  88  * It also initializes the threading system
  89  */
  90 libvlc_int_t * libvlc_InternalCreate( void )
  91 {
  92     libvlc_int_t *p_libvlc;
  93     libvlc_priv_t *priv;
  94
  95     /* Now that the thread system is initialized, we don't have much, but
  96      * at least we have variables */
  97     /* Allocate a libvlc instance object */
  98     p_libvlc = vlc_custom_create( (vlc_object_t *)NULL, sizeof (*priv),
  99                                   "libvlc" );
 100     if( p_libvlc == NULL )
 101         return NULL;
 102
 103     priv = libvlc_priv (p_libvlc);
 104     priv->playlist = NULL;
 105     priv->p_dialog_provider = NULL;
 106     priv->p_vlm = NULL;
 107
 108     vlc_ExitInit( &priv->exit );
 109
 110     return p_libvlc;
 111 }
 112
 113 /**
 114  * Initialize a libvlc instance
 115  * This function initializes a previously allocated libvlc instance:
 116  *  - CPU detection
 117  *  - gettext initialization
 118  *  - message queue, module bank and playlist initialization
 119  *  - configuration and commandline parsing
 120  */
 121 int libvlc_InternalInit( libvlc_int_t *p_libvlc, int i_argc,
 122                          const char *ppsz_argv[] )
 123 {
 124     libvlc_priv_t *priv = libvlc_priv (p_libvlc);
 125     char *       psz_modules = NULL;
 126     char *       psz_parser = NULL;
 127     char *       psz_control = NULL;
 128     char        *psz_val;
 129
 130     /* System specific initialization code */
 131     system_Init();
 132
 133     /* Initialize the module bank and load the configuration of the
 134      * core module. We need to do this at this stage to be able to display
 135      * a short help if required by the user. (short help == core module
 136      * options) */
 137     module_InitBank ();
 138
 139     /* Get command line options that affect module loading. */
 140     if( config_LoadCmdLine( p_libvlc, i_argc, ppsz_argv, NULL ) )
 141     {
 142         module_EndBank (false);
 143         return VLC_EGENERIC;
 144     }
 145
 146     vlc_LogInit (p_libvlc);
 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     {
 172         module_EndBank (true);
 173         vlc_LogDeinit (p_libvlc);
 174         return VLC_EGENERIC;
 175     }
 176
 177     /*
 178      * Support for gettext
 179      */
 180 #if defined( ENABLE_NLS ) \
 181      && ( defined( HAVE_GETTEXT ) || defined( HAVE_INCLUDED_GETTEXT ) )
 182     vlc_bindtextdomain (PACKAGE_NAME);
 183 #endif
 184     /*xgettext: Translate "C" to the language code: "fr", "en_GB", "nl", "ru"... */
 185     msg_Dbg( p_libvlc, "translation test: code is \"%s\"", _("C") );
 186
 187     if (config_PrintHelp (VLC_OBJECT(p_libvlc)))
 188     {
 189         module_EndBank (true);
 190         exit(0);
 191     }
 192
 193     if( module_count <= 1 )
 194     {
 195         msg_Err( p_libvlc, "No plugins found! Check your VLC installation.");
 196         module_EndBank (true);
 197         vlc_LogDeinit (p_libvlc);
 198         return VLC_ENOMOD;
 199     }
 200
 201 #ifdef HAVE_DAEMON
 202     /* Check for daemon mode */
 203     if( var_InheritBool( p_libvlc, "daemon" ) )
 204     {
 205         if( daemon( 1, 0) != 0 )
 206         {
 207             msg_Err( p_libvlc, "Unable to fork vlc to daemon mode" );
 208             module_EndBank (true);
 209             vlc_LogDeinit (p_libvlc);
 210             return VLC_ENOMEM;
 211         }
 212
 213         /* lets check if we need to write the pidfile */
 214         char *pidfile = var_InheritString( p_libvlc, "pidfile" );
 215         if( pidfile != NULL )
 216         {
 217             FILE *stream = vlc_fopen( pidfile, "w" );
 218             if( stream != NULL )
 219             {
 220                 fprintf( stream, "%d", (int)getpid() );
 221                 fclose( stream );
 222                 msg_Dbg( p_libvlc, "written PID file %s", pidfile );
 223             }
 224             else
 225                 msg_Err( p_libvlc, "cannot write PID file %s: %s",
 226                          pidfile, vlc_strerror_c(errno) );
 227             free( pidfile );
 228         }
 229     }
 230     else
 231     {
 232         var_Create( p_libvlc, "pidfile", VLC_VAR_STRING );
 233         var_SetString( p_libvlc, "pidfile", "" );
 234     }
 235 #endif
 236
 237 /* FIXME: could be replaced by using Unix sockets */
 238 #ifdef HAVE_DBUS
 239
 240 #define MPRIS_APPEND "/org/mpris/MediaPlayer2/TrackList/Append"
 241 #define MPRIS_BUS_NAME "org.mpris.MediaPlayer2.vlc"
 242 #define MPRIS_OBJECT_PATH "/org/mpris/MediaPlayer2"
 243 #define MPRIS_TRACKLIST_INTERFACE "org.mpris.MediaPlayer2.TrackList"
 244
 245     if( var_InheritBool( p_libvlc, "one-instance" )
 246     || ( var_InheritBool( p_libvlc, "one-instance-when-started-from-file" )
 247       && var_InheritBool( p_libvlc, "started-from-file" ) ) )
 248     {
 249         for( int i = vlc_optind; i < i_argc; i++ )
 250             if( ppsz_argv[i][0] == ':' )
 251             {
 252                 msg_Err( p_libvlc, "item option %s incompatible with single instance",
 253                          ppsz_argv[i] );
 254                 goto dbus_out;
 255             }
 256
 257         /* Initialise D-Bus interface, check for other instances */
 258         dbus_threads_init_default();
 259
 260         DBusError err;
 261         dbus_error_init( &err );
 262
 263         /* connect to the session bus */
 264         DBusConnection  *conn = dbus_bus_get( DBUS_BUS_SESSION, &err );
 265         if( conn == NULL )
 266         {
 267             msg_Err( p_libvlc, "Failed to connect to D-Bus session daemon: %s",
 268                     err.message );
 269             dbus_error_free( &err );
 270             goto dbus_out;
 271         }
 272
 273         /* check if VLC is available on the bus
 274          * if not: D-Bus control is not enabled on the other
 275          * instance and we can't pass MRLs to it */
 276         /* FIXME: This check is totally brain-dead and buggy. */
 277         if( !dbus_bus_name_has_owner( conn, MPRIS_BUS_NAME, &err ) )
 278         {
 279             dbus_connection_unref( conn );
 280             if( dbus_error_is_set( &err ) )
 281             {
 282                 msg_Err( p_libvlc, "D-Bus error: %s", err.message );
 283             }
 284             else
 285                 msg_Dbg( p_libvlc, "No media player running. Continuing normally." );
 286             dbus_error_free( &err );
 287             goto dbus_out;
 288         }
 289
 290         const dbus_bool_t play = !var_InheritBool( p_libvlc, "playlist-enqueue" );
 291
 292         msg_Warn( p_libvlc, "media player running. Exiting...");
 293         for( int i = vlc_optind; i < i_argc; i++ )
 294         {
 295             DBusMessage *msg = dbus_message_new_method_call(
 296                MPRIS_BUS_NAME, MPRIS_OBJECT_PATH, MPRIS_TRACKLIST_INTERFACE, "AddTrack" );
 297             if( unlikely(msg == NULL) )
 298                 continue;
 299
 300             /* We need to resolve relative paths in this instance */
 301             char *mrl;
 302             if( strstr( ppsz_argv[i], "://" ) )
 303                 mrl = strdup( ppsz_argv[i] );
 304             else
 305                 mrl = vlc_path2uri( ppsz_argv[i], NULL );
 306             if( mrl == NULL )
 307             {
 308                 dbus_message_unref( msg );
 309                 continue;
 310             }
 311
 312             const char *after_track = MPRIS_APPEND;
 313
 314             /* append MRLs */
 315             if( !dbus_message_append_args( msg, DBUS_TYPE_STRING, &mrl,
 316                                                 DBUS_TYPE_OBJECT_PATH, &after_track,
 317                                                 DBUS_TYPE_BOOLEAN, &play,
 318                                                 DBUS_TYPE_INVALID ) )
 319             {
 320                  dbus_message_unref( msg );
 321                  msg = NULL;
 322                  free( mrl );
 323                  continue;
 324             }
 325
 326             msg_Dbg( p_libvlc, "Adds %s to the running media player", mrl );
 327             free( mrl );
 328
 329             /* send message and get a handle for a reply */
 330             DBusMessage *reply = dbus_connection_send_with_reply_and_block( conn, msg, -1,
 331                                                                             &err );
 332             dbus_message_unref( msg );
 333             if( reply == NULL )
 334             {
 335                 msg_Err( p_libvlc, "D-Bus error: %s", err.message );
 336                 continue;
 337             }
 338             dbus_message_unref( reply );
 339         }
 340         /* we unreference the connection when we've finished with it */
 341         dbus_connection_unref( conn );
 342         exit( 1 );
 343     }
 344 #undef MPRIS_APPEND
 345 #undef MPRIS_BUS_NAME
 346 #undef MPRIS_OBJECT_PATH
 347 #undef MPRIS_TRACKLIST_INTERFACE
 348 dbus_out:
 349 #endif // HAVE_DBUS
 350
 351     vlc_CPU_dump( VLC_OBJECT(p_libvlc) );
 352
 353     priv->b_stats = var_InheritBool( p_libvlc, "stats" );
 354
 355     /*
 356      * Initialize hotkey handling
 357      */
 358     priv->actions = vlc_InitActions( p_libvlc );
 359
 360     /*
 361      * Meta data handling
 362      */
 363     priv->parser = playlist_preparser_New(VLC_OBJECT(p_libvlc));
 364
 365     /* Create a variable for showing the fullscreen interface */
 366     var_Create( p_libvlc, "intf-toggle-fscontrol", VLC_VAR_BOOL );
 367     var_SetBool( p_libvlc, "intf-toggle-fscontrol", true );
 368
 369     /* Create a variable for the Boss Key */
 370     var_Create( p_libvlc, "intf-boss", VLC_VAR_VOID );
 371
 372     /* Create a variable for showing the main interface */
 373     var_Create( p_libvlc, "intf-show", VLC_VAR_BOOL );
 374
 375     /* Create a variable for showing the right click menu */
 376     var_Create( p_libvlc, "intf-popupmenu", VLC_VAR_BOOL );
 377
 378     /* variables for signalling creation of new files */
 379     var_Create( p_libvlc, "snapshot-file", VLC_VAR_STRING );
 380     var_Create( p_libvlc, "record-file", VLC_VAR_STRING );
 381
 382     /* some default internal settings */
 383     var_Create( p_libvlc, "window", VLC_VAR_STRING );
 384     /* NOTE: Because the playlist and interfaces start before this function
 385      * returns control to the application (DESIGN BUG!), all these variables
 386      * must be created (in place of libvlc_new()) and set to VLC defaults
 387      * (in place of VLC main()) *here*. */
 388     var_Create( p_libvlc, "user-agent", VLC_VAR_STRING );
 389     var_SetString( p_libvlc, "user-agent",
 390                    "VLC media player (LibVLC "VERSION")" );
 391     var_Create( p_libvlc, "http-user-agent", VLC_VAR_STRING );
 392     var_SetString( p_libvlc, "http-user-agent",
 393                    "VLC/"PACKAGE_VERSION" LibVLC/"PACKAGE_VERSION );
 394     var_Create( p_libvlc, "app-icon-name", VLC_VAR_STRING );
 395     var_SetString( p_libvlc, "app-icon-name", PACKAGE_NAME );
 396     var_Create( p_libvlc, "app-id", VLC_VAR_STRING );
 397     var_SetString( p_libvlc, "app-id", "org.VideoLAN.VLC" );
 398     var_Create( p_libvlc, "app-version", VLC_VAR_STRING );
 399     var_SetString( p_libvlc, "app-version", PACKAGE_VERSION );
 400
 401     /* System specific configuration */
 402     system_Configure( p_libvlc, i_argc - vlc_optind, ppsz_argv + vlc_optind );
 403
 404 #ifdef ENABLE_VLM
 405     /* Initialize VLM if vlm-conf is specified */
 406     psz_parser = var_CreateGetNonEmptyString( p_libvlc, "vlm-conf" );
 407     if( psz_parser )
 408     {
 409         priv->p_vlm = vlm_New( p_libvlc );
 410         if( !priv->p_vlm )
 411             msg_Err( p_libvlc, "VLM initialization failed" );
 412     }
 413     free( psz_parser );
 414 #endif
 415
 416     /*
 417      * Load background interfaces
 418      */
 419     psz_modules = var_CreateGetNonEmptyString( p_libvlc, "extraintf" );
 420     psz_control = var_CreateGetNonEmptyString( p_libvlc, "control" );
 421
 422     if( psz_modules && psz_control )
 423     {
 424         char* psz_tmp;
 425         if( asprintf( &psz_tmp, "%s:%s", psz_modules, psz_control ) != -1 )
 426         {
 427             free( psz_modules );
 428             psz_modules = psz_tmp;
 429         }
 430     }
 431     else if( psz_control )
 432     {
 433         free( psz_modules );
 434         psz_modules = strdup( psz_control );
 435     }
 436
 437     psz_parser = psz_modules;
 438     while ( psz_parser && *psz_parser )
 439     {
 440         char *psz_module, *psz_temp;
 441         psz_module = psz_parser;
 442         psz_parser = strchr( psz_module, ':' );
 443         if ( psz_parser )
 444         {
 445             *psz_parser = '\0';
 446             psz_parser++;
 447         }
 448         if( asprintf( &psz_temp, "%s,none", psz_module ) != -1)
 449         {
 450             libvlc_InternalAddIntf( p_libvlc, psz_temp );
 451             free( psz_temp );
 452         }
 453     }
 454     free( psz_modules );
 455     free( psz_control );
 456
 457 #ifdef HAVE_SYSLOG_H
 458     if( var_InheritBool( p_libvlc, "syslog" ) )
 459     {
 460         char *logmode = var_CreateGetNonEmptyString( p_libvlc, "logmode" );
 461         var_SetString( p_libvlc, "logmode", "syslog" );
 462         libvlc_InternalAddIntf( p_libvlc, "logger,none" );
 463
 464         if( logmode )
 465         {
 466             var_SetString( p_libvlc, "logmode", logmode );
 467             free( logmode );
 468         }
 469         var_Destroy( p_libvlc, "logmode" );
 470     }
 471     else
 472 #endif
 473     if( var_InheritBool( p_libvlc, "file-logging" ) )
 474         libvlc_InternalAddIntf( p_libvlc, "logger,none" );
 475
 476     if( var_InheritBool( p_libvlc, "network-synchronisation") )
 477         libvlc_InternalAddIntf( p_libvlc, "netsync,none" );
 478
 479 #ifdef __APPLE__
 480     var_Create( p_libvlc, "drawable-view-top", VLC_VAR_INTEGER );
 481     var_Create( p_libvlc, "drawable-view-left", VLC_VAR_INTEGER );
 482     var_Create( p_libvlc, "drawable-view-bottom", VLC_VAR_INTEGER );
 483     var_Create( p_libvlc, "drawable-view-right", VLC_VAR_INTEGER );
 484     var_Create( p_libvlc, "drawable-clip-top", VLC_VAR_INTEGER );
 485     var_Create( p_libvlc, "drawable-clip-left", VLC_VAR_INTEGER );
 486     var_Create( p_libvlc, "drawable-clip-bottom", VLC_VAR_INTEGER );
 487     var_Create( p_libvlc, "drawable-clip-right", VLC_VAR_INTEGER );
 488     var_Create( p_libvlc, "drawable-nsobject", VLC_VAR_ADDRESS );
 489 #endif
 490 #if defined (_WIN32) || defined (__OS2__)
 491     var_Create( p_libvlc, "drawable-hwnd", VLC_VAR_INTEGER );
 492 #endif
 493
 494     /*
 495      * Get input filenames given as commandline arguments.
 496      * We assume that the remaining parameters are filenames
 497      * and their input options.
 498      */
 499     GetFilenames( p_libvlc, i_argc - vlc_optind, ppsz_argv + vlc_optind );
 500
 501     /*
 502      * Get --open argument
 503      */
 504     psz_val = var_InheritString( p_libvlc, "open" );
 505     if ( psz_val != NULL )
 506     {
 507         intf_InsertItem( p_libvlc, psz_val, 0, NULL, 0 );
 508         free( psz_val );
 509     }
 510
 511     return VLC_SUCCESS;
 512 }
 513
 514 /**
 515  * Cleanup a libvlc instance. The instance is not completely deallocated
 516  * \param p_libvlc the instance to clean
 517  */
 518 void libvlc_InternalCleanup( libvlc_int_t *p_libvlc )
 519 {
 520     libvlc_priv_t *priv = libvlc_priv (p_libvlc);
 521
 522     /* Ask the interfaces to stop and destroy them */
 523     msg_Dbg( p_libvlc, "removing all interfaces" );
 524     libvlc_Quit( p_libvlc );
 525     intf_DestroyAll( p_libvlc );
 526
 527 #ifdef ENABLE_VLM
 528     /* Destroy VLM if created in libvlc_InternalInit */
 529     if( priv->p_vlm )
 530     {
 531         vlm_Delete( priv->p_vlm );
 532     }
 533 #endif
 534
 535 #if !defined( _WIN32 ) && !defined( __OS2__ )
 536     char *pidfile = var_InheritString( p_libvlc, "pidfile" );
 537     if( pidfile != NULL )
 538     {
 539         msg_Dbg( p_libvlc, "removing PID file %s", pidfile );
 540         if( unlink( pidfile ) )
 541             msg_Warn( p_libvlc, "cannot remove PID file %s: %s",
 542                       pidfile, vlc_strerror_c(errno) );
 543         free( pidfile );
 544     }
 545 #endif
 546
 547     if (priv->parser != NULL)
 548         playlist_preparser_Delete(priv->parser);
 549
 550     vlc_DeinitActions( p_libvlc, priv->actions );
 551
 552     /* Save the configuration */
 553     if( !var_InheritBool( p_libvlc, "ignore-config" ) )
 554         config_AutoSaveConfigFile( VLC_OBJECT(p_libvlc) );
 555
 556     /* Free module bank. It is refcounted, so we call this each time  */
 557     module_EndBank (true);
 558     vlc_LogDeinit (p_libvlc);
 559 #if defined(_WIN32) || defined(__OS2__)
 560     system_End( );
 561 #endif
 562 }
 563
 564 /**
 565  * Destroy everything.
 566  * This function requests the running threads to finish, waits for their
 567  * termination, and destroys their structure.
 568  * It stops the thread systems: no instance can run after this has run
 569  * \param p_libvlc the instance to destroy
 570  */
 571 void libvlc_InternalDestroy( libvlc_int_t *p_libvlc )
 572 {
 573     libvlc_priv_t *priv = libvlc_priv( p_libvlc );
 574
 575     vlc_ExitDestroy( &priv->exit );
 576
 577     assert( atomic_load(&(vlc_internals(p_libvlc)->refs)) == 1 );
 578     vlc_object_release( p_libvlc );
 579 }
 580
 581 /*****************************************************************************
 582  * GetFilenames: parse command line options which are not flags
 583  *****************************************************************************
 584  * Parse command line for input files as well as their associated options.
 585  * An option always follows its associated input and begins with a ":".
 586  *****************************************************************************/
 587 static void GetFilenames( libvlc_int_t *p_vlc, unsigned n,
 588                           const char *const args[] )
 589 {
 590     while( n > 0 )
 591     {
 592         /* Count the input options */
 593         unsigned i_options = 0;
 594
 595         while( args[--n][0] == ':' )
 596         {
 597             i_options++;
 598             if( n == 0 )
 599             {
 600                 msg_Warn( p_vlc, "options %s without item", args[n] );
 601                 return; /* syntax!? */
 602             }
 603         }
 604
 605         char *mrl = NULL;
 606         if( strstr( args[n], "://" ) == NULL )
 607         {
 608             mrl = vlc_path2uri( args[n], NULL );
 609             if( !mrl )
 610                 continue;
 611         }
 612
 613         intf_InsertItem( p_vlc, (mrl != NULL) ? mrl : args[n], i_options,
 614                          ( i_options ? &args[n + 1] : NULL ),
 615                          VLC_INPUT_OPTION_TRUSTED );
 616         free( mrl );
 617     }
 618 }
 619
 620 /**
 621  * Requests extraction of the meta data for an input item (a.k.a. preparsing).
 622  * The actual extraction is asynchronous.
 623  */
 624 int libvlc_MetaRequest(libvlc_int_t *libvlc, input_item_t *item)
 625 {
 626     libvlc_priv_t *priv = libvlc_priv(libvlc);
 627
 628     if (unlikely(priv->parser == NULL))
 629         return VLC_ENOMEM;
 630
 631     playlist_preparser_Push(priv->parser, item);
 632     return VLC_SUCCESS;
 633 }
 634
 635 /**
 636  * Requests retrieving/downloading art for an input item.
 637  * The retrieval is performed asynchronously.
 638  */
 639 int libvlc_ArtRequest(libvlc_int_t *libvlc, input_item_t *item)
 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);
 647     return VLC_SUCCESS;
 648 }