src/control/media.c

   1 /*****************************************************************************
   2  * media.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 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27
  28 #include <assert.h>
  29
  30 #include <vlc/libvlc.h>
  31 #include <vlc/libvlc_media.h>
  32 #include <vlc/libvlc_media_list.h> // For the subitems, here for convenience
  33 #include <vlc/libvlc_events.h>
  34
  35 #include <vlc_common.h>
  36 #include <vlc_input.h>
  37 #include <vlc_meta.h>
  38 #include <vlc_playlist.h> /* For the preparser */
  39 #include <vlc_url.h>
  40
  41 #include "libvlc.h"
  42
  43 #include "libvlc_internal.h"
  44 #include "media_internal.h"
  45
  46 static const vlc_meta_type_t libvlc_to_vlc_meta[] =
  47 {
  48     [libvlc_meta_Title]        = vlc_meta_Title,
  49     [libvlc_meta_Artist]       = vlc_meta_Artist,
  50     [libvlc_meta_Genre]        = vlc_meta_Genre,
  51     [libvlc_meta_Copyright]    = vlc_meta_Copyright,
  52     [libvlc_meta_Album]        = vlc_meta_Album,
  53     [libvlc_meta_TrackNumber]  = vlc_meta_TrackNumber,
  54     [libvlc_meta_Description]  = vlc_meta_Description,
  55     [libvlc_meta_Rating]       = vlc_meta_Rating,
  56     [libvlc_meta_Date]         = vlc_meta_Date,
  57     [libvlc_meta_Setting]      = vlc_meta_Setting,
  58     [libvlc_meta_URL]          = vlc_meta_URL,
  59     [libvlc_meta_Language]     = vlc_meta_Language,
  60     [libvlc_meta_NowPlaying]   = vlc_meta_NowPlaying,
  61     [libvlc_meta_Publisher]    = vlc_meta_Publisher,
  62     [libvlc_meta_EncodedBy]    = vlc_meta_EncodedBy,
  63     [libvlc_meta_ArtworkURL]   = vlc_meta_ArtworkURL,
  64     [libvlc_meta_TrackID]      = vlc_meta_TrackID
  65 };
  66
  67 static const libvlc_meta_t vlc_to_libvlc_meta[] =
  68 {
  69     [vlc_meta_Title]        = libvlc_meta_Title,
  70     [vlc_meta_Artist]       = libvlc_meta_Artist,
  71     [vlc_meta_Genre]        = libvlc_meta_Genre,
  72     [vlc_meta_Copyright]    = libvlc_meta_Copyright,
  73     [vlc_meta_Album]        = libvlc_meta_Album,
  74     [vlc_meta_TrackNumber]  = libvlc_meta_TrackNumber,
  75     [vlc_meta_Description]  = libvlc_meta_Description,
  76     [vlc_meta_Rating]       = libvlc_meta_Rating,
  77     [vlc_meta_Date]         = libvlc_meta_Date,
  78     [vlc_meta_Setting]      = libvlc_meta_Setting,
  79     [vlc_meta_URL]          = libvlc_meta_URL,
  80     [vlc_meta_Language]     = libvlc_meta_Language,
  81     [vlc_meta_NowPlaying]   = libvlc_meta_NowPlaying,
  82     [vlc_meta_Publisher]    = libvlc_meta_Publisher,
  83     [vlc_meta_EncodedBy]    = libvlc_meta_EncodedBy,
  84     [vlc_meta_ArtworkURL]   = libvlc_meta_ArtworkURL,
  85     [vlc_meta_TrackID]      = libvlc_meta_TrackID
  86 };
  87
  88 /**************************************************************************
  89  * input_item_subitem_added (Private) (vlc event Callback)
  90  **************************************************************************/
  91 static void input_item_subitem_added( const vlc_event_t *p_event,
  92                                        void * user_data )
  93 {
  94     libvlc_media_t * p_md = user_data;
  95     libvlc_media_t * p_md_child;
  96     libvlc_event_t event;
  97
  98     p_md_child = libvlc_media_new_from_input_item(
  99                 p_md->p_libvlc_instance,
 100                 p_event->u.input_item_subitem_added.p_new_child );
 101
 102     /* Add this to our media list */
 103     if( !p_md->p_subitems )
 104     {
 105         p_md->p_subitems = libvlc_media_list_new( p_md->p_libvlc_instance );
 106         libvlc_media_list_set_media( p_md->p_subitems, p_md );
 107     }
 108     if( p_md->p_subitems )
 109     {
 110         libvlc_media_list_add_media( p_md->p_subitems, p_md_child );
 111     }
 112
 113     /* Construct the event */
 114     event.type = libvlc_MediaSubItemAdded;
 115     event.u.media_subitem_added.new_child = p_md_child;
 116
 117     /* Send the event */
 118     libvlc_event_send( p_md->p_event_manager, &event );
 119     libvlc_media_release( p_md_child );
 120 }
 121
 122 /**************************************************************************
 123  * input_item_meta_changed (Private) (vlc event Callback)
 124  **************************************************************************/
 125 static void input_item_meta_changed( const vlc_event_t *p_event,
 126                                      void * user_data )
 127 {
 128     libvlc_media_t * p_md = user_data;
 129     libvlc_event_t event;
 130
 131     /* Construct the event */
 132     event.type = libvlc_MediaMetaChanged;
 133     event.u.media_meta_changed.meta_type =
 134         vlc_to_libvlc_meta[p_event->u.input_item_meta_changed.meta_type];
 135
 136     /* Send the event */
 137     libvlc_event_send( p_md->p_event_manager, &event );
 138 }
 139
 140 /**************************************************************************
 141  * input_item_duration_changed (Private) (vlc event Callback)
 142  **************************************************************************/
 143 static void input_item_duration_changed( const vlc_event_t *p_event,
 144                                          void * user_data )
 145 {
 146     libvlc_media_t * p_md = user_data;
 147     libvlc_event_t event;
 148
 149     /* Construct the event */
 150     event.type = libvlc_MediaDurationChanged;
 151     event.u.media_duration_changed.new_duration =
 152         from_mtime(p_event->u.input_item_duration_changed.new_duration);
 153
 154     /* Send the event */
 155     libvlc_event_send( p_md->p_event_manager, &event );
 156 }
 157
 158 /**************************************************************************
 159  * input_item_preparsed_changed (Private) (vlc event Callback)
 160  **************************************************************************/
 161 static void input_item_preparsed_changed(const vlc_event_t *p_event,
 162                                          void * user_data)
 163 {
 164     libvlc_media_t *media = user_data;
 165     libvlc_event_t event;
 166
 167     /* Eventually notify libvlc_media_parse() */
 168     vlc_mutex_lock(&media->parsed_lock);
 169     media->is_parsed = true;
 170     vlc_cond_broadcast(&media->parsed_cond);
 171     vlc_mutex_unlock(&media->parsed_lock);
 172
 173
 174     /* Construct the event */
 175     event.type = libvlc_MediaParsedChanged;
 176     event.u.media_parsed_changed.new_status =
 177         p_event->u.input_item_preparsed_changed.new_status;
 178
 179     /* Send the event */
 180     libvlc_event_send(media->p_event_manager, &event);
 181 }
 182
 183 /**************************************************************************
 184  * Install event handler (Private)
 185  **************************************************************************/
 186 static void install_input_item_observer( libvlc_media_t *p_md )
 187 {
 188     vlc_event_attach( &p_md->p_input_item->event_manager,
 189                       vlc_InputItemSubItemAdded,
 190                       input_item_subitem_added,
 191                       p_md );
 192     vlc_event_attach( &p_md->p_input_item->event_manager,
 193                       vlc_InputItemMetaChanged,
 194                       input_item_meta_changed,
 195                       p_md );
 196     vlc_event_attach( &p_md->p_input_item->event_manager,
 197                       vlc_InputItemDurationChanged,
 198                       input_item_duration_changed,
 199                       p_md );
 200     vlc_event_attach( &p_md->p_input_item->event_manager,
 201                       vlc_InputItemPreparsedChanged,
 202                       input_item_preparsed_changed,
 203                       p_md );
 204 }
 205
 206 /**************************************************************************
 207  * Uninstall event handler (Private)
 208  **************************************************************************/
 209 static void uninstall_input_item_observer( libvlc_media_t *p_md )
 210 {
 211     vlc_event_detach( &p_md->p_input_item->event_manager,
 212                       vlc_InputItemSubItemAdded,
 213                       input_item_subitem_added,
 214                       p_md );
 215     vlc_event_detach( &p_md->p_input_item->event_manager,
 216                       vlc_InputItemMetaChanged,
 217                       input_item_meta_changed,
 218                       p_md );
 219     vlc_event_detach( &p_md->p_input_item->event_manager,
 220                       vlc_InputItemDurationChanged,
 221                       input_item_duration_changed,
 222                       p_md );
 223     vlc_event_detach( &p_md->p_input_item->event_manager,
 224                       vlc_InputItemPreparsedChanged,
 225                       input_item_preparsed_changed,
 226                       p_md );
 227 }
 228
 229 /**************************************************************************
 230  * Preparse if not already done (Private)
 231  **************************************************************************/
 232 static void preparse_if_needed( libvlc_media_t *p_md )
 233 {
 234     /* XXX: need some locking here */
 235     if (!p_md->has_asked_preparse)
 236     {
 237         playlist_PreparseEnqueue(
 238                 libvlc_priv (p_md->p_libvlc_instance->p_libvlc_int)->p_playlist,
 239                 p_md->p_input_item );
 240         p_md->has_asked_preparse = true;
 241     }
 242 }
 243
 244 /**************************************************************************
 245  * Create a new media descriptor object from an input_item
 246  * (libvlc internal)
 247  * That's the generic constructor
 248  **************************************************************************/
 249 libvlc_media_t * libvlc_media_new_from_input_item(
 250                                    libvlc_instance_t *p_instance,
 251                                    input_item_t *p_input_item )
 252 {
 253     libvlc_media_t * p_md;
 254
 255     if (!p_input_item)
 256     {
 257         libvlc_printerr( "No input item given" );
 258         return NULL;
 259     }
 260
 261     p_md = calloc( 1, sizeof(libvlc_media_t) );
 262     if( !p_md )
 263     {
 264         libvlc_printerr( "Not enough memory" );
 265         return NULL;
 266     }
 267
 268     p_md->p_libvlc_instance = p_instance;
 269     p_md->p_input_item      = p_input_item;
 270     p_md->i_refcount        = 1;
 271
 272     vlc_cond_init(&p_md->parsed_cond);
 273     vlc_mutex_init(&p_md->parsed_lock);
 274
 275     p_md->state = libvlc_NothingSpecial;
 276
 277     /* A media descriptor can be a playlist. When you open a playlist
 278      * It can give a bunch of item to read. */
 279     p_md->p_subitems        = NULL;
 280
 281     p_md->p_event_manager = libvlc_event_manager_new( p_md, p_instance );
 282     if( unlikely(p_md->p_event_manager == NULL) )
 283     {
 284         free(p_md);
 285         return NULL;
 286     }
 287
 288     libvlc_event_manager_t *em = p_md->p_event_manager;
 289     libvlc_event_manager_register_event_type(em, libvlc_MediaMetaChanged);
 290     libvlc_event_manager_register_event_type(em, libvlc_MediaSubItemAdded);
 291     libvlc_event_manager_register_event_type(em, libvlc_MediaFreed);
 292     libvlc_event_manager_register_event_type(em, libvlc_MediaDurationChanged);
 293     libvlc_event_manager_register_event_type(em, libvlc_MediaStateChanged);
 294     libvlc_event_manager_register_event_type(em, libvlc_MediaParsedChanged);
 295
 296     vlc_gc_incref( p_md->p_input_item );
 297
 298     install_input_item_observer( p_md );
 299
 300     return p_md;
 301 }
 302
 303 /**************************************************************************
 304  * Create a new media descriptor object
 305  **************************************************************************/
 306 libvlc_media_t *libvlc_media_new_location( libvlc_instance_t *p_instance,
 307                                            const char * psz_mrl )
 308 {
 309     input_item_t * p_input_item;
 310     libvlc_media_t * p_md;
 311
 312     p_input_item = input_item_New( p_instance->p_libvlc_int, psz_mrl, NULL );
 313
 314     if (!p_input_item)
 315     {
 316         libvlc_printerr( "Not enough memory" );
 317         return NULL;
 318     }
 319
 320     p_md = libvlc_media_new_from_input_item( p_instance, p_input_item );
 321
 322     /* The p_input_item is retained in libvlc_media_new_from_input_item */
 323     vlc_gc_decref( p_input_item );
 324
 325     return p_md;
 326 }
 327
 328 libvlc_media_t *libvlc_media_new_path( libvlc_instance_t *p_instance,
 329                                        const char *path )
 330 {
 331     char *mrl = make_URI( path, "file" );
 332     if( unlikely(mrl == NULL) )
 333     {
 334         libvlc_printerr( "Not enough memory" );
 335         return NULL;
 336     }
 337
 338     libvlc_media_t *m = libvlc_media_new_location( p_instance, mrl );
 339     free( mrl );
 340     return m;
 341 }
 342
 343 /**************************************************************************
 344  * Create a new media descriptor object
 345  **************************************************************************/
 346 libvlc_media_t * libvlc_media_new_as_node( libvlc_instance_t *p_instance,
 347                                            const char * psz_name )
 348 {
 349     input_item_t * p_input_item;
 350     libvlc_media_t * p_md;
 351
 352     p_input_item = input_item_New( p_instance->p_libvlc_int, "vlc://nop", psz_name );
 353
 354     if (!p_input_item)
 355     {
 356         libvlc_printerr( "Not enough memory" );
 357         return NULL;
 358     }
 359
 360     p_md = libvlc_media_new_from_input_item( p_instance, p_input_item );
 361
 362     p_md->p_subitems = libvlc_media_list_new( p_md->p_libvlc_instance );
 363
 364     return p_md;
 365 }
 366
 367 /**************************************************************************
 368  * Add an option to the media descriptor,
 369  * that will be used to determine how the media_player will read the
 370  * media. This allow to use VLC advanced reading/streaming
 371  * options in a per-media basis
 372  *
 373  * The options are detailled in vlc --long-help, for instance "--sout-all"
 374  **************************************************************************/
 375 void libvlc_media_add_option( libvlc_media_t * p_md,
 376                               const char * psz_option )
 377 {
 378     libvlc_media_add_option_flag( p_md, psz_option,
 379                           VLC_INPUT_OPTION_UNIQUE|VLC_INPUT_OPTION_TRUSTED );
 380 }
 381
 382 /**************************************************************************
 383  * Same as libvlc_media_add_option but with configurable flags.
 384  **************************************************************************/
 385 void libvlc_media_add_option_flag( libvlc_media_t * p_md,
 386                                    const char * ppsz_option,
 387                                    unsigned i_flags )
 388 {
 389     input_item_AddOption( p_md->p_input_item, ppsz_option, i_flags );
 390 }
 391
 392 /**************************************************************************
 393  * Delete a media descriptor object
 394  **************************************************************************/
 395 void libvlc_media_release( libvlc_media_t *p_md )
 396 {
 397     if (!p_md)
 398         return;
 399
 400     p_md->i_refcount--;
 401
 402     if( p_md->i_refcount > 0 )
 403         return;
 404
 405     if( p_md->p_subitems )
 406         libvlc_media_list_release( p_md->p_subitems );
 407
 408     uninstall_input_item_observer( p_md );
 409     vlc_gc_decref( p_md->p_input_item );
 410
 411     vlc_cond_destroy( &p_md->parsed_cond );
 412     vlc_mutex_destroy( &p_md->parsed_lock );
 413
 414     /* Construct the event */
 415     libvlc_event_t event;
 416     event.type = libvlc_MediaFreed;
 417     event.u.media_freed.md = p_md;
 418
 419     /* Send the event */
 420     libvlc_event_send( p_md->p_event_manager, &event );
 421
 422     libvlc_event_manager_release( p_md->p_event_manager );
 423
 424     free( p_md );
 425 }
 426
 427 /**************************************************************************
 428  * Retain a media descriptor object
 429  **************************************************************************/
 430 void libvlc_media_retain( libvlc_media_t *p_md )
 431 {
 432     assert (p_md);
 433     p_md->i_refcount++;
 434 }
 435
 436 /**************************************************************************
 437  * Duplicate a media descriptor object
 438  **************************************************************************/
 439 libvlc_media_t *
 440 libvlc_media_duplicate( libvlc_media_t *p_md_orig )
 441 {
 442     return libvlc_media_new_from_input_item(
 443         p_md_orig->p_libvlc_instance, p_md_orig->p_input_item );
 444 }
 445
 446 /**************************************************************************
 447  * Get mrl from a media descriptor object
 448  **************************************************************************/
 449 char *
 450 libvlc_media_get_mrl( libvlc_media_t * p_md )
 451 {
 452     assert( p_md );
 453     return input_item_GetURI( p_md->p_input_item );
 454 }
 455
 456 /**************************************************************************
 457  * Getter for meta information
 458  **************************************************************************/
 459
 460 char *libvlc_media_get_meta( libvlc_media_t *p_md, libvlc_meta_t e_meta )
 461 {
 462     char * psz_meta;
 463
 464     assert( p_md );
 465     /* XXX: locking */
 466
 467     preparse_if_needed( p_md );
 468
 469     psz_meta = input_item_GetMeta( p_md->p_input_item,
 470                                    libvlc_to_vlc_meta[e_meta] );
 471
 472     if( e_meta == libvlc_meta_ArtworkURL && !psz_meta && !p_md->has_asked_art )
 473     {
 474         p_md->has_asked_art = true;
 475         playlist_AskForArtEnqueue(
 476                 libvlc_priv(p_md->p_libvlc_instance->p_libvlc_int)->p_playlist,
 477                 p_md->p_input_item );
 478     }
 479
 480     /* Should be integrated in core */
 481     if( !psz_meta && e_meta == libvlc_meta_Title && p_md->p_input_item->psz_name )
 482     {
 483         free( psz_meta );
 484         return strdup( p_md->p_input_item->psz_name );
 485     }
 486
 487     return psz_meta;
 488 }
 489
 490 /**************************************************************************
 491  * Setter for meta information
 492  **************************************************************************/
 493
 494 void libvlc_media_set_meta( libvlc_media_t *p_md, libvlc_meta_t e_meta, const char *psz_value )
 495 {
 496     assert( p_md );
 497     input_item_SetMeta( p_md->p_input_item, libvlc_to_vlc_meta[e_meta], psz_value );
 498 }
 499
 500 int libvlc_media_save_meta( libvlc_media_t *p_md )
 501 {
 502     assert( p_md );
 503     vlc_object_t *p_obj = VLC_OBJECT(libvlc_priv(
 504                             p_md->p_libvlc_instance->p_libvlc_int)->p_playlist);
 505     return input_item_WriteMeta( p_obj, p_md->p_input_item ) == VLC_SUCCESS;
 506 }
 507
 508 /**************************************************************************
 509  * Getter for state information
 510  * Can be error, playing, buffering, NothingSpecial.
 511  **************************************************************************/
 512
 513 libvlc_state_t
 514 libvlc_media_get_state( libvlc_media_t *p_md )
 515 {
 516     assert( p_md );
 517     return p_md->state;
 518 }
 519
 520 /**************************************************************************
 521  * Setter for state information (LibVLC Internal)
 522  **************************************************************************/
 523
 524 void
 525 libvlc_media_set_state( libvlc_media_t *p_md,
 526                                    libvlc_state_t state )
 527 {
 528     libvlc_event_t event;
 529
 530     p_md->state = state;
 531
 532     /* Construct the event */
 533     event.type = libvlc_MediaStateChanged;
 534     event.u.media_state_changed.new_state = state;
 535
 536     /* Send the event */
 537     libvlc_event_send( p_md->p_event_manager, &event );
 538 }
 539
 540 /**************************************************************************
 541  * subitems
 542  **************************************************************************/
 543 libvlc_media_list_t *
 544 libvlc_media_subitems( libvlc_media_t * p_md )
 545 {
 546     if( p_md->p_subitems )
 547         libvlc_media_list_retain( p_md->p_subitems );
 548     return p_md->p_subitems;
 549 }
 550
 551 /**************************************************************************
 552  * Getter for statistics information
 553  **************************************************************************/
 554 int libvlc_media_get_stats( libvlc_media_t *p_md,
 555                             libvlc_media_stats_t *p_stats )
 556 {
 557     if( !p_md->p_input_item )
 558         return false;
 559
 560     input_stats_t *p_itm_stats = p_md->p_input_item->p_stats;
 561     vlc_mutex_lock( &p_itm_stats->lock );
 562     p_stats->i_read_bytes = p_itm_stats->i_read_bytes;
 563     p_stats->f_input_bitrate = p_itm_stats->f_input_bitrate;
 564
 565     p_stats->i_demux_read_bytes = p_itm_stats->i_demux_read_bytes;
 566     p_stats->f_demux_bitrate = p_itm_stats->f_demux_bitrate;
 567     p_stats->i_demux_corrupted = p_itm_stats->i_demux_corrupted;
 568     p_stats->i_demux_discontinuity = p_itm_stats->i_demux_discontinuity;
 569
 570     p_stats->i_decoded_video = p_itm_stats->i_decoded_video;
 571     p_stats->i_decoded_audio = p_itm_stats->i_decoded_audio;
 572
 573     p_stats->i_displayed_pictures = p_itm_stats->i_displayed_pictures;
 574     p_stats->i_lost_pictures = p_itm_stats->i_lost_pictures;
 575
 576     p_stats->i_played_abuffers = p_itm_stats->i_played_abuffers;
 577     p_stats->i_lost_abuffers = p_itm_stats->i_lost_abuffers;
 578
 579     p_stats->i_sent_packets = p_itm_stats->i_sent_packets;
 580     p_stats->i_sent_bytes = p_itm_stats->i_sent_bytes;
 581     p_stats->f_send_bitrate = p_itm_stats->f_send_bitrate;
 582     vlc_mutex_unlock( &p_itm_stats->lock );
 583     return true;
 584 }
 585
 586 /**************************************************************************
 587  * event_manager
 588  **************************************************************************/
 589 libvlc_event_manager_t *
 590 libvlc_media_event_manager( libvlc_media_t * p_md )
 591 {
 592     assert( p_md );
 593
 594     return p_md->p_event_manager;
 595 }
 596
 597 /**************************************************************************
 598  * Get duration of media object (in ms)
 599  **************************************************************************/
 600 int64_t
 601 libvlc_media_get_duration( libvlc_media_t * p_md )
 602 {
 603     assert( p_md );
 604
 605     if( !p_md->p_input_item )
 606     {
 607         libvlc_printerr( "No input item" );
 608         return -1;
 609     }
 610
 611     preparse_if_needed( p_md );
 612
 613     if (!input_item_IsPreparsed( p_md->p_input_item ))
 614         return -1;
 615
 616     return from_mtime(input_item_GetDuration( p_md->p_input_item ));
 617 }
 618
 619 /**************************************************************************
 620  * Parse the media.
 621  **************************************************************************/
 622 void
 623 libvlc_media_parse(libvlc_media_t *media)
 624 {
 625     preparse_if_needed(media);
 626
 627     vlc_mutex_lock(&media->parsed_lock);
 628     while (!media->is_parsed)
 629         vlc_cond_wait(&media->parsed_cond, &media->parsed_lock);
 630     vlc_mutex_unlock(&media->parsed_lock);
 631 }
 632
 633 /**************************************************************************
 634  * Parse the media.
 635  **************************************************************************/
 636 void
 637 libvlc_media_parse_async(libvlc_media_t *media)
 638 {
 639     preparse_if_needed(media);
 640 }
 641
 642 /**************************************************************************
 643  * Get parsed status for media object.
 644  **************************************************************************/
 645 int
 646 libvlc_media_is_parsed( libvlc_media_t * p_md )
 647 {
 648     assert( p_md );
 649
 650     if( !p_md->p_input_item )
 651         return false;
 652
 653     return input_item_IsPreparsed( p_md->p_input_item );
 654 }
 655
 656 /**************************************************************************
 657  * Sets media descriptor's user_data. user_data is specialized data
 658  * accessed by the host application, VLC.framework uses it as a pointer to
 659  * an native object that references a libvlc_media_t pointer
 660  **************************************************************************/
 661 void
 662 libvlc_media_set_user_data( libvlc_media_t * p_md, void * p_new_user_data )
 663 {
 664     assert( p_md );
 665     p_md->p_user_data = p_new_user_data;
 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_t pointer
 672  **************************************************************************/
 673 void *
 674 libvlc_media_get_user_data( libvlc_media_t * p_md )
 675 {
 676     assert( p_md );
 677     return p_md->p_user_data;
 678 }
 679
 680 /**************************************************************************
 681  * Get media descriptor's elementary streams description
 682  **************************************************************************/
 683 int
 684 libvlc_media_get_tracks_info( libvlc_media_t *p_md, libvlc_media_track_info_t ** pp_es )
 685 {
 686     assert( p_md );
 687
 688     input_item_t *p_input_item = p_md->p_input_item;
 689     vlc_mutex_lock( &p_input_item->lock );
 690
 691     const int i_es = p_input_item->i_es;
 692     *pp_es = (i_es > 0) ? malloc( i_es * sizeof(libvlc_media_track_info_t) ) : NULL;
 693
 694     if( !pp_es ) /* no ES, or OOM */
 695     {
 696         vlc_mutex_unlock( &p_input_item->lock );
 697         return 0;
 698     }
 699
 700     /* Fill array */
 701     for( int i = 0; i < i_es; i++ )
 702     {
 703         libvlc_media_track_info_t *p_mes = *pp_es+i;
 704         const es_format_t *p_es = p_input_item->es[i];
 705
 706         p_mes->i_codec = p_es->i_codec;
 707         p_mes->i_id = p_es->i_id;
 708
 709         p_mes->i_profile = p_es->i_profile;
 710         p_mes->i_level = p_es->i_level;
 711
 712         switch(p_es->i_cat)
 713         {
 714         case UNKNOWN_ES:
 715         default:
 716             p_mes->i_type = libvlc_track_unknown;
 717             break;
 718         case VIDEO_ES:
 719             p_mes->i_type = libvlc_track_video;
 720             p_mes->u.video.i_height = p_es->video.i_height;
 721             p_mes->u.video.i_width = p_es->video.i_width;
 722             break;
 723         case AUDIO_ES:
 724             p_mes->i_type = libvlc_track_audio;
 725             p_mes->u.audio.i_channels = p_es->audio.i_channels;
 726             p_mes->u.audio.i_rate = p_es->audio.i_rate;
 727             break;
 728         case SPU_ES:
 729             p_mes->i_type = libvlc_track_text;
 730             break;
 731         }
 732     }
 733
 734     vlc_mutex_unlock( &p_input_item->lock );
 735     return i_es;
 736 }