git.sesse.net Git - vlc/blob - src/control/media_descriptor.c

   1 /*****************************************************************************
   2  * media_descriptor.c: Libvlc API media descripor management
   3  *****************************************************************************
   4  * Copyright (C) 2007 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Pierre d'Herbemont <pdherbemont@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #include <vlc/libvlc.h>
  25 #include <vlc_input.h>
  26 #include <vlc_meta.h>
  27
  28 /* For the preparser */
  29 #include <vlc_playlist.h>
  30
  31 #include "libvlc_internal.h"
  32
  33 static const vlc_meta_type_t libvlc_to_vlc_meta[] =
  34 {
  35     [libvlc_meta_Title]        = vlc_meta_Title,
  36     [libvlc_meta_Artist]       = vlc_meta_Artist,
  37     [libvlc_meta_Genre]        = vlc_meta_Genre,
  38     [libvlc_meta_Copyright]    = vlc_meta_Copyright,
  39     [libvlc_meta_Album]        = vlc_meta_Album,
  40     [libvlc_meta_TrackNumber]  = vlc_meta_TrackNumber,
  41     [libvlc_meta_Description]  = vlc_meta_Description,
  42     [libvlc_meta_Rating]       = vlc_meta_Rating,
  43     [libvlc_meta_Date]         = vlc_meta_Date,
  44     [libvlc_meta_Setting]      = vlc_meta_Setting,
  45     [libvlc_meta_URL]          = vlc_meta_URL,
  46     [libvlc_meta_Language]     = vlc_meta_Language,
  47     [libvlc_meta_NowPlaying]   = vlc_meta_NowPlaying,
  48     [libvlc_meta_Publisher]    = vlc_meta_Publisher,
  49     [libvlc_meta_EncodedBy]    = vlc_meta_EncodedBy,
  50     [libvlc_meta_ArtworkURL]   = vlc_meta_ArtworkURL,
  51     [libvlc_meta_TrackID]      = vlc_meta_TrackID
  52 };
  53
  54 static const libvlc_meta_t vlc_to_libvlc_meta[] =
  55 {
  56     [vlc_meta_Title]        = libvlc_meta_Title,
  57     [vlc_meta_Artist]       = libvlc_meta_Artist,
  58     [vlc_meta_Genre]        = libvlc_meta_Genre,
  59     [vlc_meta_Copyright]    = libvlc_meta_Copyright,
  60     [vlc_meta_Album]        = libvlc_meta_Album,
  61     [vlc_meta_TrackNumber]  = libvlc_meta_TrackNumber,
  62     [vlc_meta_Description]  = libvlc_meta_Description,
  63     [vlc_meta_Rating]       = libvlc_meta_Rating,
  64     [vlc_meta_Date]         = libvlc_meta_Date,
  65     [vlc_meta_Setting]      = libvlc_meta_Setting,
  66     [vlc_meta_URL]          = libvlc_meta_URL,
  67     [vlc_meta_Language]     = libvlc_meta_Language,
  68     [vlc_meta_NowPlaying]   = libvlc_meta_NowPlaying,
  69     [vlc_meta_Publisher]    = libvlc_meta_Publisher,
  70     [vlc_meta_EncodedBy]    = libvlc_meta_EncodedBy,
  71     [vlc_meta_ArtworkURL]   = libvlc_meta_ArtworkURL,
  72     [vlc_meta_TrackID]      = libvlc_meta_TrackID
  73 };
  74
  75 /**************************************************************************
  76  * input_item_subitem_added (Private) (vlc event Callback)
  77  **************************************************************************/
  78 static void input_item_subitem_added( const vlc_event_t *p_event,
  79                                        void * user_data )
  80 {
  81     libvlc_media_descriptor_t * p_md = user_data;
  82     libvlc_media_descriptor_t * p_md_child;
  83     libvlc_event_t event;
  84
  85     p_md_child = libvlc_media_descriptor_new_from_input_item(
  86                 p_md->p_libvlc_instance,
  87                 p_event->u.input_item_subitem_added.p_new_child, NULL );
  88
  89     /* Add this to our media list */
  90     if( !p_md->p_subitems )
  91     {
  92         p_md->p_subitems = libvlc_media_list_new( p_md->p_libvlc_instance, NULL );
  93         libvlc_media_list_set_media_descriptor( p_md->p_subitems, p_md, NULL );
  94     }
  95     if( p_md->p_subitems )
  96     {
  97         libvlc_media_list_add_media_descriptor( p_md->p_subitems, p_md_child, NULL );
  98     }
  99
 100     /* Construct the event */
 101     event.type = libvlc_MediaDescriptorSubItemAdded;
 102     event.u.media_descriptor_subitem_added.new_child = p_md_child;
 103
 104     /* Send the event */
 105     libvlc_event_send( p_md->p_event_manager, &event );
 106     libvlc_media_descriptor_release( p_md_child );
 107 }
 108
 109 /**************************************************************************
 110  * input_item_meta_changed (Private) (vlc event Callback)
 111  **************************************************************************/
 112 static void input_item_meta_changed( const vlc_event_t *p_event,
 113                                      void * user_data )
 114 {
 115     libvlc_media_descriptor_t * p_md = user_data;
 116     libvlc_event_t event;
 117
 118     /* Construct the event */
 119     event.type = libvlc_MediaDescriptorMetaChanged;
 120     event.u.media_descriptor_meta_changed.meta_type =
 121         vlc_to_libvlc_meta[p_event->u.input_item_meta_changed.meta_type];
 122
 123     /* Send the event */
 124     libvlc_event_send( p_md->p_event_manager, &event );
 125 }
 126
 127 /**************************************************************************
 128  * input_item_duration_changed (Private) (vlc event Callback)
 129  **************************************************************************/
 130 static void input_item_duration_changed( const vlc_event_t *p_event,
 131                                          void * user_data )
 132 {
 133     libvlc_media_descriptor_t * p_md = user_data;
 134     libvlc_event_t event;
 135
 136     /* Construct the event */
 137     event.type = libvlc_MediaDescriptorDurationChanged;
 138     event.u.media_descriptor_duration_changed.new_duration =
 139         p_event->u.input_item_duration_changed.new_duration;
 140
 141     /* Send the event */
 142     libvlc_event_send( p_md->p_event_manager, &event );
 143 }
 144
 145 /**************************************************************************
 146  * input_item_preparsed_changed (Private) (vlc event Callback)
 147  **************************************************************************/
 148 static void input_item_preparsed_changed( const vlc_event_t *p_event,
 149                                           void * user_data )
 150 {
 151     libvlc_media_descriptor_t * p_md = user_data;
 152     libvlc_event_t event;
 153
 154     /* Construct the event */
 155     event.type = libvlc_MediaDescriptorPreparsedChanged;
 156     event.u.media_descriptor_preparsed_changed.new_status =
 157         p_event->u.input_item_preparsed_changed.new_status;
 158
 159     /* Send the event */
 160     libvlc_event_send( p_md->p_event_manager, &event );
 161 }
 162
 163 /**************************************************************************
 164  * Install event handler (Private)
 165  **************************************************************************/
 166 static void install_input_item_observer( libvlc_media_descriptor_t *p_md )
 167 {
 168     vlc_event_attach( &p_md->p_input_item->event_manager,
 169                       vlc_InputItemSubItemAdded,
 170                       input_item_subitem_added,
 171                       p_md );
 172     vlc_event_attach( &p_md->p_input_item->event_manager,
 173                       vlc_InputItemMetaChanged,
 174                       input_item_meta_changed,
 175                       p_md );
 176     vlc_event_attach( &p_md->p_input_item->event_manager,
 177                       vlc_InputItemDurationChanged,
 178                       input_item_duration_changed,
 179                       p_md );
 180     vlc_event_attach( &p_md->p_input_item->event_manager,
 181                       vlc_InputItemPreparsedChanged,
 182                       input_item_preparsed_changed,
 183                       p_md );
 184 }
 185
 186 /**************************************************************************
 187  * Uninstall event handler (Private)
 188  **************************************************************************/
 189 static void uninstall_input_item_observer( libvlc_media_descriptor_t *p_md )
 190 {
 191     vlc_event_detach( &p_md->p_input_item->event_manager,
 192                       vlc_InputItemSubItemAdded,
 193                       input_item_subitem_added,
 194                       p_md );
 195     vlc_event_detach( &p_md->p_input_item->event_manager,
 196                       vlc_InputItemMetaChanged,
 197                       input_item_meta_changed,
 198                       p_md );
 199     vlc_event_detach( &p_md->p_input_item->event_manager,
 200                       vlc_InputItemDurationChanged,
 201                       input_item_duration_changed,
 202                       p_md );
 203     vlc_event_detach( &p_md->p_input_item->event_manager,
 204                       vlc_InputItemPreparsedChanged,
 205                       input_item_preparsed_changed,
 206                       p_md );
 207 }
 208
 209 /**************************************************************************
 210  * Preparse if not already done (Private)
 211  **************************************************************************/
 212 static void preparse_if_needed( libvlc_media_descriptor_t *p_md )
 213 {
 214     /* XXX: need some locking here */
 215     if (!p_md->b_preparsed)
 216     {
 217         playlist_PreparseEnqueue(
 218                 p_md->p_libvlc_instance->p_libvlc_int->p_playlist,
 219                 p_md->p_input_item );
 220         playlist_AskForArtEnqueue(
 221                 p_md->p_libvlc_instance->p_libvlc_int->p_playlist,
 222                 p_md->p_input_item );
 223
 224         p_md->b_preparsed = VLC_TRUE;
 225     }
 226 }
 227
 228 /**************************************************************************
 229  * Create a new media descriptor object from an input_item
 230  * (libvlc internal)
 231  * That's the generic constructor
 232  **************************************************************************/
 233 libvlc_media_descriptor_t * libvlc_media_descriptor_new_from_input_item(
 234                                    libvlc_instance_t *p_instance,
 235                                    input_item_t *p_input_item,
 236                                    libvlc_exception_t *p_e )
 237 {
 238     libvlc_media_descriptor_t * p_md;
 239
 240     if (!p_input_item)
 241     {
 242         libvlc_exception_raise( p_e, "No input item given" );
 243         return NULL;
 244     }
 245
 246     p_md = malloc( sizeof(libvlc_media_descriptor_t) );
 247     p_md->p_libvlc_instance = p_instance;
 248     p_md->p_input_item      = p_input_item;
 249     p_md->b_preparsed       = VLC_FALSE;
 250     p_md->i_refcount        = 1;
 251     p_md->p_user_data       = NULL;
 252
 253     p_md->state = libvlc_NothingSpecial;
 254
 255     /* A media descriptor can be a playlist. When you open a playlist
 256      * It can give a bunch of item to read. */
 257     p_md->p_subitems        = NULL;
 258
 259     vlc_dictionary_init( &p_md->tags, 1 );
 260
 261     p_md->p_event_manager = libvlc_event_manager_new( p_md, p_instance, p_e );
 262     libvlc_event_manager_register_event_type( p_md->p_event_manager,
 263         libvlc_MediaDescriptorMetaChanged, p_e );
 264     libvlc_event_manager_register_event_type( p_md->p_event_manager,
 265         libvlc_MediaDescriptorSubItemAdded, p_e );
 266     libvlc_event_manager_register_event_type( p_md->p_event_manager,
 267         libvlc_MediaDescriptorFreed, p_e );
 268     libvlc_event_manager_register_event_type( p_md->p_event_manager,
 269         libvlc_MediaDescriptorDurationChanged, p_e );
 270     libvlc_event_manager_register_event_type( p_md->p_event_manager,
 271         libvlc_MediaDescriptorStateChanged, p_e );
 272
 273     vlc_gc_incref( p_md->p_input_item );
 274
 275     install_input_item_observer( p_md );
 276
 277     return p_md;
 278 }
 279
 280 /**************************************************************************
 281  * Create a new media descriptor object
 282  **************************************************************************/
 283 libvlc_media_descriptor_t * libvlc_media_descriptor_new(
 284                                    libvlc_instance_t *p_instance,
 285                                    const char * psz_mrl,
 286                                    libvlc_exception_t *p_e )
 287 {
 288     input_item_t * p_input_item;
 289     libvlc_media_descriptor_t * p_md;
 290
 291     p_input_item = input_ItemNew( p_instance->p_libvlc_int, psz_mrl, NULL );
 292
 293     if (!p_input_item)
 294     {
 295         libvlc_exception_raise( p_e, "Can't create md's input_item" );
 296         return NULL;
 297     }
 298
 299     p_md = libvlc_media_descriptor_new_from_input_item( p_instance,
 300                 p_input_item, p_e );
 301
 302     /* The p_input_item is retained in libvlc_media_descriptor_new_from_input_item */
 303     vlc_gc_decref( p_input_item );
 304
 305     return p_md;
 306 }
 307
 308 /**************************************************************************
 309  * Create a new media descriptor object
 310  **************************************************************************/
 311 libvlc_media_descriptor_t * libvlc_media_descriptor_new_as_node(
 312                                    libvlc_instance_t *p_instance,
 313                                    const char * psz_name,
 314                                    libvlc_exception_t *p_e )
 315 {
 316     input_item_t * p_input_item;
 317     libvlc_media_descriptor_t * p_md;
 318
 319     p_input_item = input_ItemNew( p_instance->p_libvlc_int, "vlc:nop", psz_name );
 320
 321     if (!p_input_item)
 322     {
 323         libvlc_exception_raise( p_e, "Can't create md's input_item" );
 324         return NULL;
 325     }
 326
 327     p_md = libvlc_media_descriptor_new_from_input_item( p_instance,
 328                 p_input_item, p_e );
 329
 330     p_md->p_subitems = libvlc_media_list_new( p_md->p_libvlc_instance, NULL );
 331
 332     return p_md;
 333 }
 334
 335 /**************************************************************************
 336  * Add an option to the media descriptor,
 337  * that will be used to determine how the media_instance will read the
 338  * media_descriptor. This allow to use VLC advanced reading/streaming
 339  * options in a per-media basis
 340  *
 341  * The options are detailled in vlc --long-help, for instance "--sout-all"
 342  **************************************************************************/
 343 void libvlc_media_descriptor_add_option(
 344                                    libvlc_media_descriptor_t * p_md,
 345                                    const char * ppsz_option,
 346                                    libvlc_exception_t *p_e )
 347 {
 348     (void)p_e;
 349     input_ItemAddOptionNoDup( p_md->p_input_item, ppsz_option );
 350 }
 351
 352 /**************************************************************************
 353  * Delete a media descriptor object
 354  **************************************************************************/
 355 void libvlc_media_descriptor_release( libvlc_media_descriptor_t *p_md )
 356 {
 357     int i;
 358     if (!p_md)
 359         return;
 360
 361     p_md->i_refcount--;
 362
 363     if( p_md->i_refcount > 0 )
 364         return;
 365
 366     if( p_md->p_subitems )
 367         libvlc_media_list_release( p_md->p_subitems );
 368
 369     uninstall_input_item_observer( p_md );
 370     vlc_gc_decref( p_md->p_input_item );
 371
 372     /* Construct the event */
 373     libvlc_event_t event;
 374     event.type = libvlc_MediaDescriptorFreed;
 375     event.u.media_descriptor_freed.md = p_md;
 376
 377     /* Send the event */
 378     libvlc_event_send( p_md->p_event_manager, &event );
 379
 380     libvlc_event_manager_release( p_md->p_event_manager );
 381
 382     char ** all_keys = vlc_dictionary_all_keys( &p_md->tags );
 383     for( i = 0; all_keys[i]; i++ )
 384     {
 385         int j;
 386         struct libvlc_tags_storage_t * p_ts = vlc_dictionary_value_for_key( &p_md->tags, all_keys[i] );
 387         for( j = 0; j < p_ts->i_count; j++ )
 388         {
 389             free( p_ts->ppsz_tags[j] );
 390             free( p_ts->ppsz_tags );
 391         }
 392         free( p_ts );
 393     }
 394     vlc_dictionary_clear( &p_md->tags );
 395     free( p_md );
 396 }
 397
 398 /**************************************************************************
 399  * Retain a media descriptor object
 400  **************************************************************************/
 401 void libvlc_media_descriptor_retain( libvlc_media_descriptor_t *p_md )
 402 {
 403     if (!p_md)
 404         return;
 405
 406     p_md->i_refcount++;
 407 }
 408
 409 /**************************************************************************
 410  * Duplicate a media descriptor object
 411  **************************************************************************/
 412 libvlc_media_descriptor_t *
 413 libvlc_media_descriptor_duplicate( libvlc_media_descriptor_t *p_md_orig )
 414 {
 415     return libvlc_media_descriptor_new_from_input_item(
 416         p_md_orig->p_libvlc_instance, p_md_orig->p_input_item, NULL );
 417 }
 418
 419 /**************************************************************************
 420  * Retain a media descriptor object
 421  **************************************************************************/
 422 char *
 423 libvlc_media_descriptor_get_mrl( libvlc_media_descriptor_t * p_md,
 424                                  libvlc_exception_t * p_e )
 425 {
 426     (void)p_e;
 427     return input_item_GetURI( p_md->p_input_item );
 428 }
 429
 430 /**************************************************************************
 431  * Getter for meta information
 432  **************************************************************************/
 433
 434 char * libvlc_media_descriptor_get_meta( libvlc_media_descriptor_t *p_md,
 435                                          libvlc_meta_t e_meta,
 436                                          libvlc_exception_t *p_e )
 437 {
 438     char * psz_meta;
 439
 440     /* XXX: locking */
 441
 442     preparse_if_needed( p_md );
 443
 444     psz_meta = input_item_GetMeta( p_md->p_input_item,
 445                                    libvlc_to_vlc_meta[e_meta] );
 446
 447     /* Should be integrated in core */
 448     if( !psz_meta && e_meta == libvlc_meta_Title && p_md->p_input_item->psz_name )
 449     {
 450         free( psz_meta );
 451         return strdup( p_md->p_input_item->psz_name );
 452     }
 453
 454     return psz_meta;
 455 }
 456
 457 /**************************************************************************
 458  * Getter for state information
 459  * Can be error, playing, buffering, NothingSpecial.
 460  **************************************************************************/
 461
 462 libvlc_state_t
 463 libvlc_media_descriptor_get_state( libvlc_media_descriptor_t *p_md,
 464                                    libvlc_exception_t *p_e )
 465 {
 466     (void)p_e;
 467     return p_md->state;
 468 }
 469
 470 /**************************************************************************
 471  * Setter for state information (LibVLC Internal)
 472  **************************************************************************/
 473
 474 void
 475 libvlc_media_descriptor_set_state( libvlc_media_descriptor_t *p_md,
 476                                    libvlc_state_t state,
 477                                    libvlc_exception_t *p_e )
 478 {
 479     (void)p_e;
 480     libvlc_event_t event;
 481
 482     p_md->state = state;
 483
 484     /* Construct the event */
 485     event.type = libvlc_MediaDescriptorStateChanged;
 486     event.u.media_descriptor_state_changed.new_state = state;
 487
 488     /* Send the event */
 489     libvlc_event_send( p_md->p_event_manager, &event );
 490 }
 491
 492 /**************************************************************************
 493  * Add a tag
 494  **************************************************************************/
 495 void libvlc_media_descriptor_add_tag( libvlc_media_descriptor_t *p_md,
 496                                       const char * key,
 497                                       const libvlc_tag_t tag,
 498                                       libvlc_exception_t *p_e )
 499 {
 500     struct libvlc_tags_storage_t * p_ts;
 501
 502     if( !tag || !key )
 503         return;
 504
 505     p_ts = vlc_dictionary_value_for_key( &p_md->tags, key );
 506
 507     if( !p_ts )
 508     {
 509         p_ts = malloc(sizeof(struct libvlc_tags_storage_t));
 510         memset( p_ts, 0, sizeof(struct libvlc_tags_storage_t) );
 511     }
 512     p_ts->i_count++;
 513
 514     if( !p_ts->ppsz_tags )
 515         p_ts->ppsz_tags = malloc(sizeof(char*)*(p_ts->i_count));
 516     else
 517         p_ts->ppsz_tags = realloc(p_ts->ppsz_tags, sizeof(char*)*(p_ts->i_count));
 518
 519     p_ts->ppsz_tags[p_ts->i_count-1] = strdup( tag );
 520 }
 521
 522
 523 /**************************************************************************
 524  * Remove a tag
 525  **************************************************************************/
 526 void libvlc_media_descriptor_remove_tag( libvlc_media_descriptor_t *p_md,
 527                                          const char * key,
 528                                          const libvlc_tag_t tag,
 529                                          libvlc_exception_t *p_e )
 530 {
 531     struct libvlc_tags_storage_t * p_ts;
 532     int i;
 533
 534     if( !tag || !key )
 535         return;
 536
 537     p_ts = vlc_dictionary_value_for_key( &p_md->tags, key );
 538
 539     if( !p_ts )
 540         return;
 541
 542     for( i = 0; i < p_ts->i_count; i++ )
 543     {
 544         if( !strcmp( p_ts->ppsz_tags[i], tag ) )
 545         {
 546             free( p_ts->ppsz_tags[i] );
 547             memcpy( p_ts->ppsz_tags + i + 1, p_ts->ppsz_tags + i, (p_ts->i_count - i - 2)*sizeof(char*) );
 548             /* Don't dealloc, the memory will be regain if we add a new tag */
 549             p_ts->i_count--;
 550             return;
 551         }
 552     }
 553 }
 554
 555 /**************************************************************************
 556  * Get tags count
 557  **************************************************************************/
 558 int libvlc_media_descriptor_tags_count_for_key( libvlc_media_descriptor_t *p_md,
 559                                                  const char * key,
 560                                                  libvlc_exception_t *p_e )
 561 {
 562     struct libvlc_tags_storage_t * p_ts;
 563
 564     if( !key )
 565         return 0;
 566
 567     p_ts = vlc_dictionary_value_for_key( &p_md->tags, key );
 568
 569     if( !p_ts )
 570         return 0;
 571     return p_ts->i_count;
 572 }
 573
 574 /**************************************************************************
 575  * Get a tag
 576  **************************************************************************/
 577 libvlc_tag_t
 578 libvlc_media_descriptor_tag_at_index_for_key( libvlc_media_descriptor_t *p_md,
 579                                               int i,
 580                                               const char * key,
 581                                               libvlc_exception_t *p_e )
 582 {
 583     struct libvlc_tags_storage_t * p_ts;
 584
 585     if( !key )
 586         return NULL;
 587
 588     p_ts = vlc_dictionary_value_for_key( &p_md->tags, key );
 589
 590     if( !p_ts )
 591         return NULL;
 592
 593     return strdup( p_ts->ppsz_tags[i] );
 594 }
 595
 596 /**************************************************************************
 597  * subitems
 598  **************************************************************************/
 599 libvlc_media_list_t *
 600 libvlc_media_descriptor_subitems( libvlc_media_descriptor_t * p_md,
 601                                   libvlc_exception_t * p_e )
 602 {
 603     if( p_md->p_subitems )
 604         libvlc_media_list_retain( p_md->p_subitems );
 605     return p_md->p_subitems;
 606 }
 607
 608 /**************************************************************************
 609  * event_manager
 610  **************************************************************************/
 611 libvlc_event_manager_t *
 612 libvlc_media_descriptor_event_manager( libvlc_media_descriptor_t * p_md,
 613                                        libvlc_exception_t * p_e )
 614 {
 615     return p_md->p_event_manager;
 616 }
 617
 618 /**************************************************************************
 619  * Get duration of media_descriptor object.
 620  **************************************************************************/
 621 vlc_int64_t
 622 libvlc_media_descriptor_get_duration( libvlc_media_descriptor_t * p_md,
 623                                       libvlc_exception_t * p_e )
 624 {
 625     if( p_md && p_md->p_input_item)
 626     {
 627         return input_item_GetDuration( p_md->p_input_item );
 628     }
 629     else
 630     {
 631         return -1;
 632     }
 633 }
 634
 635 /**************************************************************************
 636  * Get preparsed status for media_descriptor object.
 637  **************************************************************************/
 638 vlc_bool_t
 639 libvlc_media_descriptor_is_preparsed( libvlc_media_descriptor_t * p_md,
 640                                        libvlc_exception_t * p_e )
 641 {
 642     if( p_md && p_md->p_input_item)
 643     {
 644         return input_item_IsPreparsed( p_md->p_input_item );
 645     }
 646     else
 647     {
 648         return VLC_FALSE;
 649     }
 650 }
 651
 652 /**************************************************************************
 653  * Sets media descriptor's user_data. user_data is specialized data
 654  * accessed by the host application, VLC.framework uses it as a pointer to
 655  * an native object that references a libvlc_media_descriptor_t pointer
 656  **************************************************************************/
 657 void
 658 libvlc_media_descriptor_set_user_data( libvlc_media_descriptor_t * p_md,
 659                                        void * p_new_user_data,
 660                                        libvlc_exception_t * p_e )
 661 {
 662     if( p_md )
 663     {
 664         p_md->p_user_data = p_new_user_data;
 665     }
 666 }
 667
 668 /**************************************************************************
 669  * Get media descriptor's user_data. user_data is specialized data
 670  * accessed by the host application, VLC.framework uses it as a pointer to
 671  * an native object that references a libvlc_media_descriptor_t pointer
 672  **************************************************************************/
 673 void *
 674 libvlc_media_descriptor_get_user_data( libvlc_media_descriptor_t * p_md,
 675                                        libvlc_exception_t * p_e )
 676 {
 677     if( p_md )
 678     {
 679         return p_md->p_user_data;
 680     }
 681     else
 682     {
 683         return NULL;
 684     }
 685 }
 686