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( (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_vlm = NULL;
 106
 107     vlc_ExitInit( &priv->exit );
 108
 109     return p_libvlc;
 110 }
 111
 112 /**
 113  * Initialize a libvlc instance
 114  * This function initializes a previously allocated libvlc instance:
 115  *  - CPU detection
 116  *  - gettext initialization
 117  *  - message queue, module bank and playlist initialization
 118  *  - configuration and commandline parsing
 119  */
 120 int libvlc_InternalInit( libvlc_int_t *p_libvlc, int i_argc,
 121                          const char *ppsz_argv[] )
 122 {
 123     libvlc_priv_t *priv = libvlc_priv (p_libvlc);
 124     char *       psz_modules = NULL;
 125     char *       psz_parser = NULL;
 126     char *       psz_control = NULL;
 127     char        *psz_val;
 128     int          i_ret = VLC_EGENERIC;
 129
 130     /* System specific initialization code */
 131     system_Init();
 132
 133     vlc_LogPreinit(p_libvlc);
 134
 135     /* Initialize the module bank and load the configuration of the
 136      * core module. We need to do this at this stage to be able to display
 137      * a short help if required by the user. (short help == core module
 138      * options) */
 139     module_InitBank ();
 140
 141     /* Get command line options that affect module loading. */
 142     if( config_LoadCmdLine( p_libvlc, i_argc, ppsz_argv, NULL ) )
 143     {
 144         module_EndBank (false);
 145         return VLC_EGENERIC;
 146     }
 147
 148     vlc_threads_setup (p_libvlc);
 149
 150     /* Load the builtins and plugins into the module_bank.
 151      * We have to do it before config_Load*() because this also gets the
 152      * list of configuration options exported by each module and loads their
 153      * default values. */
 154     size_t module_count = module_LoadPlugins (p_libvlc);
 155
 156     /*
 157      * Override default configuration with config file settings
 158      */
 159     if( !var_InheritBool( p_libvlc, "ignore-config" ) )
 160     {
 161         if( var_InheritBool( p_libvlc, "reset-config" ) )
 162             config_SaveConfigFile( p_libvlc ); /* Save default config */
 163         else
 164             config_LoadConfigFile( p_libvlc );
 165     }
 166
 167     /*
 168      * Override configuration with command line settings
 169      */
 170     int vlc_optind;
 171     if( config_LoadCmdLine( p_libvlc, i_argc, ppsz_argv, &vlc_optind ) )
 172         goto error;
 173
 174     vlc_LogInit(p_libvlc);
 175
 176     /*
 177      * Support for gettext
 178      */
 179 #if defined( ENABLE_NLS ) \
 180      && ( defined( HAVE_GETTEXT ) || defined( HAVE_INCLUDED_GETTEXT ) )
 181     vlc_bindtextdomain (PACKAGE_NAME);
 182 #endif
 183     /*xgettext: Translate "C" to the language code: "fr", "en_GB", "nl", "ru"... */
 184     msg_Dbg( p_libvlc, "translation test: code is \"%s\"", _("C") );
 185
 186     if (config_PrintHelp (VLC_OBJECT(p_libvlc)))
 187     {
 188         libvlc_InternalCleanup (p_libvlc);
 189         exit(0);
 190     }
 191
 192     if( module_count <= 1 )
 193     {
 194         msg_Err( p_libvlc, "No plugins found! Check your VLC installation.");
 195         i_ret = VLC_ENOMOD;
 196         goto error;
 197     }
 198
 199 #ifdef HAVE_DAEMON
 200     /* Check for daemon mode */
 201     if( var_InheritBool( p_libvlc, "daemon" ) )
 202     {
 203         if( daemon( 1, 0) != 0 )
 204         {
 205             msg_Err( p_libvlc, "Unable to fork vlc to daemon mode" );
 206             goto error;
 207         }
 208
 209         /* lets check if we need to write the pidfile */
 210         char *pidfile = var_InheritString( p_libvlc, "pidfile" );
 211         if( pidfile != NULL )
 212         {
 213             FILE *stream = vlc_fopen( pidfile, "w" );
 214             if( stream != NULL )
 215             {
 216                 fprintf( stream, "%d", (int)getpid() );
 217                 fclose( stream );
 218                 msg_Dbg( p_libvlc, "written PID file %s", pidfile );
 219             }
 220             else
 221                 msg_Err( p_libvlc, "cannot write PID file %s: %s",
 222                          pidfile, vlc_strerror_c(errno) );
 223             free( pidfile );
 224         }
 225     }
 226     else
 227     {
 228         var_Create( p_libvlc, "pidfile", VLC_VAR_STRING );
 229         var_SetString( p_libvlc, "pidfile", "" );
 230     }
 231 #endif
 232
 233     i_ret = VLC_ENOMEM;
 234
 235     if( libvlc_InternalDialogInit( p_libvlc ) != VLC_SUCCESS )
 236         goto error;
 237     if( libvlc_InternalKeystoreInit( p_libvlc ) != VLC_SUCCESS )
 238         msg_Warn( p_libvlc, "memory keystore init failed" );
 239
 240 /* FIXME: could be replaced by using Unix sockets */
 241 #ifdef HAVE_DBUS
 242
 243 #define MPRIS_APPEND "/org/mpris/MediaPlayer2/TrackList/Append"
 244 #define MPRIS_BUS_NAME "org.mpris.MediaPlayer2.vlc"
 245 #define MPRIS_OBJECT_PATH "/org/mpris/MediaPlayer2"
 246 #define MPRIS_TRACKLIST_INTERFACE "org.mpris.MediaPlayer2.TrackList"
 247
 248     if( var_InheritBool( p_libvlc, "one-instance" )
 249     || ( var_InheritBool( p_libvlc, "one-instance-when-started-from-file" )
 250       && var_InheritBool( p_libvlc, "started-from-file" ) ) )
 251     {
 252         for( int i = vlc_optind; i < i_argc; i++ )
 253             if( ppsz_argv[i][0] == ':' )
 254             {
 255                 msg_Err( p_libvlc, "item option %s incompatible with single instance",
 256                          ppsz_argv[i] );
 257                 goto dbus_out;
 258             }
 259
 260         /* Initialise D-Bus interface, check for other instances */
 261         dbus_threads_init_default();
 262
 263         DBusError err;
 264         dbus_error_init( &err );
 265
 266         /* connect to the session bus */
 267         DBusConnection  *conn = dbus_bus_get( DBUS_BUS_SESSION, &err );
 268         if( conn == NULL )
 269         {
 270             msg_Err( p_libvlc, "Failed to connect to D-Bus session daemon: %s",
 271                     err.message );
 272             dbus_error_free( &err );
 273             goto dbus_out;
 274         }
 275
 276         /* check if VLC is available on the bus
 277          * if not: D-Bus control is not enabled on the other
 278          * instance and we can't pass MRLs to it */
 279         /* FIXME: This check is totally brain-dead and buggy. */
 280         if( !dbus_bus_name_has_owner( conn, MPRIS_BUS_NAME, &err ) )
 281         {
 282             dbus_connection_unref( conn );
 283             if( dbus_error_is_set( &err ) )
 284             {
 285                 msg_Err( p_libvlc, "D-Bus error: %s", err.message );
 286             }
 287             else
 288                 msg_Dbg( p_libvlc, "No media player running. Continuing normally." );
 289             dbus_error_free( &err );
 290             goto dbus_out;
 291         }
 292
 293         const dbus_bool_t play = !var_InheritBool( p_libvlc, "playlist-enqueue" );
 294
 295         msg_Warn( p_libvlc, "media player running. Exiting...");
 296         for( int i = vlc_optind; i < i_argc; i++ )
 297         {
 298             DBusMessage *msg = dbus_message_new_method_call(
 299                MPRIS_BUS_NAME, MPRIS_OBJECT_PATH, MPRIS_TRACKLIST_INTERFACE, "AddTrack" );
 300             if( unlikely(msg == NULL) )
 301                 continue;
 302
 303             /* We need to resolve relative paths in this instance */
 304             char *mrl;
 305             if( strstr( ppsz_argv[i], "://" ) )
 306                 mrl = strdup( ppsz_argv[i] );
 307             else
 308                 mrl = vlc_path2uri( ppsz_argv[i], NULL );
 309             if( mrl == NULL )
 310             {
 311                 dbus_message_unref( msg );
 312                 continue;
 313             }
 314
 315             const char *after_track = MPRIS_APPEND;
 316
 317             /* append MRLs */
 318             if( !dbus_message_append_args( msg, DBUS_TYPE_STRING, &mrl,
 319                                                 DBUS_TYPE_OBJECT_PATH, &after_track,
 320                                                 DBUS_TYPE_BOOLEAN, &play,
 321                                                 DBUS_TYPE_INVALID ) )
 322             {
 323                  dbus_message_unref( msg );
 324                  msg = NULL;
 325                  free( mrl );
 326                  continue;
 327             }
 328
 329             msg_Dbg( p_libvlc, "Adds %s to the running media player", mrl );
 330             free( mrl );
 331
 332             /* send message and get a handle for a reply */
 333             DBusMessage *reply = dbus_connection_send_with_reply_and_block( conn, msg, -1,
 334                                                                             &err );
 335             dbus_message_unref( msg );
 336             if( reply == NULL )
 337             {
 338                 msg_Err( p_libvlc, "D-Bus error: %s", err.message );
 339                 continue;
 340             }
 341             dbus_message_unref( reply );
 342         }
 343         /* we unreference the connection when we've finished with it */
 344         dbus_connection_unref( conn );
 345         exit( 0 );
 346     }
 347 #undef MPRIS_APPEND
 348 #undef MPRIS_BUS_NAME
 349 #undef MPRIS_OBJECT_PATH
 350 #undef MPRIS_TRACKLIST_INTERFACE
 351 dbus_out:
 352 #endif // HAVE_DBUS
 353
 354     vlc_CPU_dump( VLC_OBJECT(p_libvlc) );
 355
 356     priv->b_stats = var_InheritBool( p_libvlc, "stats" );
 357
 358     /*
 359      * Initialize hotkey handling
 360      */
 361     priv->actions = vlc_InitActions( p_libvlc );
 362     if( !priv->actions )
 363         goto error;
 364
 365     /*
 366      * Meta data handling
 367      */
 368     priv->parser = playlist_preparser_New(VLC_OBJECT(p_libvlc));
 369     if( !priv->parser )
 370         goto error;
 371
 372     /* Create a variable for showing the fullscreen interface */
 373     var_Create( p_libvlc, "intf-toggle-fscontrol", VLC_VAR_BOOL );
 374     var_SetBool( p_libvlc, "intf-toggle-fscontrol", true );
 375
 376     /* Create a variable for the Boss Key */
 377     var_Create( p_libvlc, "intf-boss", VLC_VAR_VOID );
 378
 379     /* Create a variable for showing the main interface */
 380     var_Create( p_libvlc, "intf-show", VLC_VAR_BOOL );
 381
 382     /* Create a variable for showing the right click menu */
 383     var_Create( p_libvlc, "intf-popupmenu", VLC_VAR_BOOL );
 384
 385     /* variables for signalling creation of new files */
 386     var_Create( p_libvlc, "snapshot-file", VLC_VAR_STRING );
 387     var_Create( p_libvlc, "record-file", VLC_VAR_STRING );
 388
 389     /* some default internal settings */
 390     var_Create( p_libvlc, "window", VLC_VAR_STRING );
 391     /* NOTE: Because the playlist and interfaces start before this function
 392      * returns control to the application (DESIGN BUG!), all these variables
 393      * must be created (in place of libvlc_new()) and set to VLC defaults
 394      * (in place of VLC main()) *here*. */
 395     var_Create( p_libvlc, "user-agent", VLC_VAR_STRING );
 396     var_SetString( p_libvlc, "user-agent",
 397                    "VLC media player (LibVLC "VERSION")" );
 398     var_Create( p_libvlc, "http-user-agent", VLC_VAR_STRING );
 399     var_SetString( p_libvlc, "http-user-agent",
 400                    "VLC/"PACKAGE_VERSION" LibVLC/"PACKAGE_VERSION );
 401     var_Create( p_libvlc, "app-icon-name", VLC_VAR_STRING );
 402     var_SetString( p_libvlc, "app-icon-name", PACKAGE_NAME );
 403     var_Create( p_libvlc, "app-id", VLC_VAR_STRING );
 404     var_SetString( p_libvlc, "app-id", "org.VideoLAN.VLC" );
 405     var_Create( p_libvlc, "app-version", VLC_VAR_STRING );
 406     var_SetString( p_libvlc, "app-version", PACKAGE_VERSION );
 407
 408     /* System specific configuration */
 409     system_Configure( p_libvlc, i_argc - vlc_optind, ppsz_argv + vlc_optind );
 410
 411 #ifdef ENABLE_VLM
 412     /* Initialize VLM if vlm-conf is specified */
 413     psz_parser = var_CreateGetNonEmptyString( p_libvlc, "vlm-conf" );
 414     if( psz_parser )
 415     {
 416         priv->p_vlm = vlm_New( p_libvlc );
 417         if( !priv->p_vlm )
 418             msg_Err( p_libvlc, "VLM initialization failed" );
 419     }
 420     free( psz_parser );
 421 #endif
 422
 423     /*
 424      * Load background interfaces
 425      */
 426     psz_modules = var_CreateGetNonEmptyString( p_libvlc, "extraintf" );
 427     psz_control = var_CreateGetNonEmptyString( p_libvlc, "control" );
 428
 429     if( psz_modules && psz_control )
 430     {
 431         char* psz_tmp;
 432         if( asprintf( &psz_tmp, "%s:%s", psz_modules, psz_control ) != -1 )
 433         {
 434             free( psz_modules );
 435             psz_modules = psz_tmp;
 436         }
 437     }
 438     else if( psz_control )
 439     {
 440         free( psz_modules );
 441         psz_modules = strdup( psz_control );
 442     }
 443
 444     psz_parser = psz_modules;
 445     while ( psz_parser && *psz_parser )
 446     {
 447         char *psz_module, *psz_temp;
 448         psz_module = psz_parser;
 449         psz_parser = strchr( psz_module, ':' );
 450         if ( psz_parser )
 451         {
 452             *psz_parser = '\0';
 453             psz_parser++;
 454         }
 455         if( asprintf( &psz_temp, "%s,none", psz_module ) != -1)
 456         {
 457             libvlc_InternalAddIntf( p_libvlc, psz_temp );
 458             free( psz_temp );
 459         }
 460     }
 461     free( psz_modules );
 462     free( psz_control );
 463
 464     if( var_InheritBool( p_libvlc, "network-synchronisation") )
 465         libvlc_InternalAddIntf( p_libvlc, "netsync,none" );
 466
 467 #ifdef __APPLE__
 468     var_Create( p_libvlc, "drawable-view-top", VLC_VAR_INTEGER );
 469     var_Create( p_libvlc, "drawable-view-left", VLC_VAR_INTEGER );
 470     var_Create( p_libvlc, "drawable-view-bottom", VLC_VAR_INTEGER );
 471     var_Create( p_libvlc, "drawable-view-right", VLC_VAR_INTEGER );
 472     var_Create( p_libvlc, "drawable-clip-top", VLC_VAR_INTEGER );
 473     var_Create( p_libvlc, "drawable-clip-left", VLC_VAR_INTEGER );
 474     var_Create( p_libvlc, "drawable-clip-bottom", VLC_VAR_INTEGER );
 475     var_Create( p_libvlc, "drawable-clip-right", VLC_VAR_INTEGER );
 476     var_Create( p_libvlc, "drawable-nsobject", VLC_VAR_ADDRESS );
 477 #endif
 478
 479     /*
 480      * Get input filenames given as commandline arguments.
 481      * We assume that the remaining parameters are filenames
 482      * and their input options.
 483      */
 484     GetFilenames( p_libvlc, i_argc - vlc_optind, ppsz_argv + vlc_optind );
 485
 486     /*
 487      * Get --open argument
 488      */
 489     psz_val = var_InheritString( p_libvlc, "open" );
 490     if ( psz_val != NULL )
 491     {
 492         intf_InsertItem( p_libvlc, psz_val, 0, NULL, 0 );
 493         free( psz_val );
 494     }
 495
 496     return VLC_SUCCESS;
 497
 498 error:
 499     libvlc_InternalCleanup( p_libvlc );
 500     return i_ret;
 501 }
 502
 503 /**
 504  * Cleanup a libvlc instance. The instance is not completely deallocated
 505  * \param p_libvlc the instance to clean
 506  */
 507 void libvlc_InternalCleanup( libvlc_int_t *p_libvlc )
 508 {
 509     libvlc_priv_t *priv = libvlc_priv (p_libvlc);
 510
 511     /* Ask the interfaces to stop and destroy them */
 512     msg_Dbg( p_libvlc, "removing all interfaces" );
 513     intf_DestroyAll( p_libvlc );
 514
 515     libvlc_InternalDialogClean( p_libvlc );
 516     libvlc_InternalKeystoreClean( p_libvlc );
 517
 518 #ifdef ENABLE_VLM
 519     /* Destroy VLM if created in libvlc_InternalInit */
 520     if( priv->p_vlm )
 521     {
 522         vlm_Delete( priv->p_vlm );
 523     }
 524 #endif
 525
 526 #if !defined( _WIN32 ) && !defined( __OS2__ )
 527     char *pidfile = var_InheritString( p_libvlc, "pidfile" );
 528     if( pidfile != NULL )
 529     {
 530         msg_Dbg( p_libvlc, "removing PID file %s", pidfile );
 531         if( unlink( pidfile ) )
 532             msg_Warn( p_libvlc, "cannot remove PID file %s: %s",
 533                       pidfile, vlc_strerror_c(errno) );
 534         free( pidfile );
 535     }
 536 #endif
 537
 538     if (priv->parser != NULL)
 539         playlist_preparser_Delete(priv->parser);
 540
 541     vlc_DeinitActions( p_libvlc, priv->actions );
 542
 543     /* Save the configuration */
 544     if( !var_InheritBool( p_libvlc, "ignore-config" ) )
 545         config_AutoSaveConfigFile( VLC_OBJECT(p_libvlc) );
 546
 547     /* Free module bank. It is refcounted, so we call this each time  */
 548     vlc_LogDeinit (p_libvlc);
 549     module_EndBank (true);
 550 #if defined(_WIN32) || defined(__OS2__)
 551     system_End( );
 552 #endif
 553 }
 554
 555 /**
 556  * Destroy everything.
 557  * This function requests the running threads to finish, waits for their
 558  * termination, and destroys their structure.
 559  * It stops the thread systems: no instance can run after this has run
 560  * \param p_libvlc the instance to destroy
 561  */
 562 void libvlc_InternalDestroy( libvlc_int_t *p_libvlc )
 563 {
 564     libvlc_priv_t *priv = libvlc_priv( p_libvlc );
 565
 566     vlc_ExitDestroy( &priv->exit );
 567
 568     assert( atomic_load(&(vlc_internals(p_libvlc)->refs)) == 1 );
 569     vlc_object_release( p_libvlc );
 570 }
 571
 572 /*****************************************************************************
 573  * GetFilenames: parse command line options which are not flags
 574  *****************************************************************************
 575  * Parse command line for input files as well as their associated options.
 576  * An option always follows its associated input and begins with a ":".
 577  *****************************************************************************/
 578 static void GetFilenames( libvlc_int_t *p_vlc, unsigned n,
 579                           const char *const args[] )
 580 {
 581     while( n > 0 )
 582     {
 583         /* Count the input options */
 584         unsigned i_options = 0;
 585
 586         while( args[--n][0] == ':' )
 587         {
 588             i_options++;
 589             if( n == 0 )
 590             {
 591                 msg_Warn( p_vlc, "options %s without item", args[n] );
 592                 return; /* syntax!? */
 593             }
 594         }
 595
 596         char *mrl = NULL;
 597         if( strstr( args[n], "://" ) == NULL )
 598         {
 599             mrl = vlc_path2uri( args[n], NULL );
 600             if( !mrl )
 601                 continue;
 602         }
 603
 604         intf_InsertItem( p_vlc, (mrl != NULL) ? mrl : args[n], i_options,
 605                          ( i_options ? &args[n + 1] : NULL ),
 606                          VLC_INPUT_OPTION_TRUSTED );
 607         free( mrl );
 608     }
 609 }
 610
 611 /**
 612  * Requests extraction of the meta data for an input item (a.k.a. preparsing).
 613  * The actual extraction is asynchronous. It can be cancelled with
 614  * libvlc_MetadataCancel()
 615  */
 616 int libvlc_MetadataRequest(libvlc_int_t *libvlc, input_item_t *item,
 617                            input_item_meta_request_option_t i_options,
 618                            int timeout, void *id)
 619 {
 620     libvlc_priv_t *priv = libvlc_priv(libvlc);
 621
 622     if (unlikely(priv->parser == NULL))
 623         return VLC_ENOMEM;
 624
 625     vlc_mutex_lock( &item->lock );
 626     if( item->i_preparse_depth == 0 )
 627         item->i_preparse_depth = 1;
 628     if( i_options & META_REQUEST_OPTION_DO_INTERACT )
 629         item->b_preparse_interact = true;
 630     vlc_mutex_unlock( &item->lock );
 631     playlist_preparser_Push( priv->parser, item, i_options, timeout, id );
 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                       input_item_meta_request_option_t i_options)
 641 {
 642     libvlc_priv_t *priv = libvlc_priv(libvlc);
 643
 644     if (unlikely(priv->parser == NULL))
 645         return VLC_ENOMEM;
 646
 647     playlist_preparser_fetcher_Push(priv->parser, item, i_options);
 648     return VLC_SUCCESS;
 649 }
 650
 651 /**
 652  * Cancels extraction of the meta data for an input item.
 653  *
 654  * This does nothing if the input item is already processed or if it was not
 655  * added with libvlc_MetadataRequest()
 656  */
 657 void libvlc_MetadataCancel(libvlc_int_t *libvlc, void *id)
 658 {
 659     libvlc_priv_t *priv = libvlc_priv(libvlc);
 660
 661     if (unlikely(priv->parser == NULL))
 662         return;
 663
 664     playlist_preparser_Cancel(priv->parser, id);
 665 }