lib/media.c

   1 /*****************************************************************************
   2  * media.c: Libvlc API media descripor management
   3  *****************************************************************************
   4  * Copyright (C) 2007 VLC authors and VideoLAN
   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 it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * 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 #include <errno.h>
  30
  31 #include <vlc/libvlc.h>
  32 #include <vlc/libvlc_media.h>
  33 #include <vlc/libvlc_media_list.h> // For the subitems, here for convenience
  34 #include <vlc/libvlc_events.h>
  35
  36 #include <vlc_common.h>
  37 #include <vlc_input.h>
  38 #include <vlc_meta.h>
  39 #include <vlc_playlist.h> /* For the preparser */
  40 #include <vlc_url.h>
  41
  42 #include "../src/libvlc.h"
  43
  44 #include "libvlc_internal.h"
  45 #include "media_internal.h"
  46 #include "media_list_internal.h"
  47
  48 static const vlc_meta_type_t libvlc_to_vlc_meta[] =
  49 {
  50     [libvlc_meta_Title]        = vlc_meta_Title,
  51     [libvlc_meta_Artist]       = vlc_meta_Artist,
  52     [libvlc_meta_Genre]        = vlc_meta_Genre,
  53     [libvlc_meta_Copyright]    = vlc_meta_Copyright,
  54     [libvlc_meta_Album]        = vlc_meta_Album,
  55     [libvlc_meta_TrackNumber]  = vlc_meta_TrackNumber,
  56     [libvlc_meta_Description]  = vlc_meta_Description,
  57     [libvlc_meta_Rating]       = vlc_meta_Rating,
  58     [libvlc_meta_Date]         = vlc_meta_Date,
  59     [libvlc_meta_Setting]      = vlc_meta_Setting,
  60     [libvlc_meta_URL]          = vlc_meta_URL,
  61     [libvlc_meta_Language]     = vlc_meta_Language,
  62     [libvlc_meta_NowPlaying]   = vlc_meta_NowPlaying,
  63     [libvlc_meta_Publisher]    = vlc_meta_Publisher,
  64     [libvlc_meta_EncodedBy]    = vlc_meta_EncodedBy,
  65     [libvlc_meta_ArtworkURL]   = vlc_meta_ArtworkURL,
  66     [libvlc_meta_TrackID]      = vlc_meta_TrackID,
  67     [libvlc_meta_TrackTotal]   = vlc_meta_TrackTotal,
  68     [libvlc_meta_Director]     = vlc_meta_Director,
  69     [libvlc_meta_Season]       = vlc_meta_Season,
  70     [libvlc_meta_Episode]      = vlc_meta_Episode,
  71     [libvlc_meta_ShowName]     = vlc_meta_ShowName,
  72     [libvlc_meta_Actors]       = vlc_meta_Actors,
  73     [libvlc_meta_AlbumArtist]  = vlc_meta_AlbumArtist,
  74     [libvlc_meta_DiscNumber]   = vlc_meta_DiscNumber,
  75     [libvlc_meta_DiscTotal]    = vlc_meta_DiscTotal
  76 };
  77
  78 static const libvlc_meta_t vlc_to_libvlc_meta[] =
  79 {
  80     [vlc_meta_Title]        = libvlc_meta_Title,
  81     [vlc_meta_Artist]       = libvlc_meta_Artist,
  82     [vlc_meta_Genre]        = libvlc_meta_Genre,
  83     [vlc_meta_Copyright]    = libvlc_meta_Copyright,
  84     [vlc_meta_Album]        = libvlc_meta_Album,
  85     [vlc_meta_TrackNumber]  = libvlc_meta_TrackNumber,
  86     [vlc_meta_Description]  = libvlc_meta_Description,
  87     [vlc_meta_Rating]       = libvlc_meta_Rating,
  88     [vlc_meta_Date]         = libvlc_meta_Date,
  89     [vlc_meta_Setting]      = libvlc_meta_Setting,
  90     [vlc_meta_URL]          = libvlc_meta_URL,
  91     [vlc_meta_Language]     = libvlc_meta_Language,
  92     [vlc_meta_NowPlaying]   = libvlc_meta_NowPlaying,
  93     [vlc_meta_ESNowPlaying] = libvlc_meta_NowPlaying,
  94     [vlc_meta_Publisher]    = libvlc_meta_Publisher,
  95     [vlc_meta_EncodedBy]    = libvlc_meta_EncodedBy,
  96     [vlc_meta_ArtworkURL]   = libvlc_meta_ArtworkURL,
  97     [vlc_meta_TrackID]      = libvlc_meta_TrackID,
  98     [vlc_meta_TrackTotal]   = libvlc_meta_TrackTotal,
  99     [vlc_meta_Director]     = libvlc_meta_Director,
 100     [vlc_meta_Season]       = libvlc_meta_Season,
 101     [vlc_meta_Episode]      = libvlc_meta_Episode,
 102     [vlc_meta_ShowName]     = libvlc_meta_ShowName,
 103     [vlc_meta_Actors]       = libvlc_meta_Actors,
 104     [vlc_meta_AlbumArtist]  = libvlc_meta_AlbumArtist,
 105     [vlc_meta_DiscNumber]   = libvlc_meta_DiscNumber,
 106     [vlc_meta_DiscTotal]    = libvlc_meta_DiscTotal
 107 };
 108
 109 static_assert(
 110     ORIENT_TOP_LEFT     == (int) libvlc_video_orient_top_left &&
 111     ORIENT_TOP_RIGHT    == (int) libvlc_video_orient_top_right &&
 112     ORIENT_BOTTOM_LEFT  == (int) libvlc_video_orient_bottom_left &&
 113     ORIENT_BOTTOM_RIGHT == (int) libvlc_video_orient_bottom_right &&
 114     ORIENT_LEFT_TOP     == (int) libvlc_video_orient_left_top &&
 115     ORIENT_LEFT_BOTTOM  == (int) libvlc_video_orient_left_bottom &&
 116     ORIENT_RIGHT_TOP    == (int) libvlc_video_orient_right_top &&
 117     ORIENT_RIGHT_BOTTOM == (int) libvlc_video_orient_right_bottom,
 118     "Mismatch between libvlc_video_orient_t and video_orientation_t" );
 119
 120 static_assert(
 121     PROJECTION_MODE_RECTANGULAR             == (int) libvlc_video_projection_rectangular &&
 122     PROJECTION_MODE_EQUIRECTANGULAR         == (int) libvlc_video_projection_equirectangular &&
 123     PROJECTION_MODE_CUBEMAP_LAYOUT_STANDARD == (int) libvlc_video_projection_cubemap_layout_standard,
 124     "Mismatch between libvlc_video_projection_t and video_projection_mode_t" );
 125
 126 static_assert(
 127     MULTIVIEW_2D                    == (int) libvlc_video_multiview_2d &&
 128     MULTIVIEW_STEREO_SBS            == (int) libvlc_video_multiview_stereo_sbs &&
 129     MULTIVIEW_STEREO_TB             == (int) libvlc_video_multiview_stereo_tb &&
 130     MULTIVIEW_STEREO_ROW            == (int) libvlc_video_multiview_stereo_row &&
 131     MULTIVIEW_STEREO_COL            == (int) libvlc_video_multiview_stereo_col &&
 132     MULTIVIEW_STEREO_FRAME          == (int) libvlc_video_multiview_stereo_frame &&
 133     MULTIVIEW_STEREO_CHECKERBOARD   == (int) libvlc_video_multiview_stereo_checkerboard,
 134     "Mismatch between libvlc_video_multiview_t and video_multiview_mode_t");
 135
 136 static libvlc_media_list_t *media_get_subitems( libvlc_media_t * p_md,
 137                                                 bool b_create )
 138 {
 139     libvlc_media_list_t *p_subitems = NULL;
 140
 141     vlc_mutex_lock( &p_md->subitems_lock );
 142     if( p_md->p_subitems == NULL && b_create )
 143     {
 144         p_md->p_subitems = libvlc_media_list_new( p_md->p_libvlc_instance );
 145         if( p_md->p_subitems != NULL )
 146         {
 147             p_md->p_subitems->b_read_only = true;
 148             p_md->p_subitems->p_internal_md = p_md;
 149         }
 150     }
 151     p_subitems = p_md->p_subitems;
 152     vlc_mutex_unlock( &p_md->subitems_lock );
 153     return p_subitems;
 154 }
 155
 156 static libvlc_media_t *input_item_add_subitem( libvlc_media_t *p_md,
 157                                                input_item_t *item )
 158 {
 159     libvlc_media_t * p_md_child;
 160     libvlc_media_list_t *p_subitems;
 161     libvlc_event_t event;
 162
 163     p_md_child = libvlc_media_new_from_input_item( p_md->p_libvlc_instance,
 164                                                    item );
 165
 166     /* Add this to our media list */
 167     p_subitems = media_get_subitems( p_md, true );
 168     if( p_subitems != NULL )
 169     {
 170         libvlc_media_list_lock( p_subitems );
 171         libvlc_media_list_internal_add_media( p_subitems, p_md_child );
 172         libvlc_media_list_unlock( p_subitems );
 173     }
 174
 175     /* Construct the event */
 176     event.type = libvlc_MediaSubItemAdded;
 177     event.u.media_subitem_added.new_child = p_md_child;
 178
 179     /* Send the event */
 180     libvlc_event_send( &p_md->event_manager, &event );
 181     return p_md_child;
 182 }
 183
 184 static void input_item_add_subnode( libvlc_media_t *md,
 185                                     input_item_node_t *node )
 186 {
 187     for( int i = 0; i < node->i_children; i++ )
 188     {
 189         input_item_node_t *child = node->pp_children[i];
 190         libvlc_media_t *md_child = input_item_add_subitem( md, child->p_item );
 191
 192         if( md_child != NULL )
 193         {
 194             input_item_add_subnode( md_child, child );
 195             libvlc_media_release( md_child );
 196         }
 197     }
 198 }
 199
 200 /**************************************************************************
 201  * input_item_subitemtree_added (Private) (vlc event Callback)
 202  **************************************************************************/
 203 static void input_item_subtree_added(input_item_t *item,
 204                                      input_item_node_t *node,
 205                                      void *user_data)
 206 {
 207     VLC_UNUSED(item);
 208     libvlc_media_t * p_md = user_data;
 209     libvlc_media_add_subtree(p_md, node);
 210 }
 211
 212 void libvlc_media_add_subtree(libvlc_media_t *p_md, input_item_node_t *node)
 213 {
 214     /* FIXME FIXME FIXME
 215      * Recursive function calls seem much simpler for this. But playlists are
 216      * untrusted and can be arbitrarily deep (e.g. with XSPF). So recursion can
 217      * potentially lead to plain old stack overflow. */
 218     input_item_add_subnode( p_md, node );
 219
 220     /* Construct the event */
 221     libvlc_event_t event;
 222     event.type = libvlc_MediaSubItemTreeAdded;
 223     event.u.media_subitemtree_added.item = p_md;
 224
 225     /* Send the event */
 226     libvlc_event_send( &p_md->event_manager, &event );
 227 }
 228
 229 /**************************************************************************
 230  * input_item_meta_changed (Private) (vlc event Callback)
 231  **************************************************************************/
 232 static void input_item_meta_changed( const vlc_event_t *p_event,
 233                                      void * user_data )
 234 {
 235     libvlc_media_t * p_md = user_data;
 236     libvlc_event_t event;
 237
 238     /* Construct the event */
 239     event.type = libvlc_MediaMetaChanged;
 240     event.u.media_meta_changed.meta_type =
 241         vlc_to_libvlc_meta[p_event->u.input_item_meta_changed.meta_type];
 242
 243     /* Send the event */
 244     libvlc_event_send( &p_md->event_manager, &event );
 245 }
 246
 247 /**************************************************************************
 248  * input_item_duration_changed (Private) (vlc event Callback)
 249  **************************************************************************/
 250 static void input_item_duration_changed( const vlc_event_t *p_event,
 251                                          void * user_data )
 252 {
 253     libvlc_media_t * p_md = user_data;
 254     libvlc_event_t event;
 255
 256     /* Construct the event */
 257     event.type = libvlc_MediaDurationChanged;
 258     event.u.media_duration_changed.new_duration =
 259         from_mtime(p_event->u.input_item_duration_changed.new_duration);
 260
 261     /* Send the event */
 262     libvlc_event_send( &p_md->event_manager, &event );
 263 }
 264
 265 static void send_parsed_changed( libvlc_media_t *p_md,
 266                                  libvlc_media_parsed_status_t new_status )
 267 {
 268     libvlc_event_t event;
 269
 270     vlc_mutex_lock( &p_md->parsed_lock );
 271     if( p_md->parsed_status == new_status )
 272     {
 273         vlc_mutex_unlock( &p_md->parsed_lock );
 274         return;
 275     }
 276
 277     /* Legacy: notify libvlc_media_parse */
 278     if( !p_md->is_parsed )
 279     {
 280         p_md->is_parsed = true;
 281         vlc_cond_broadcast( &p_md->parsed_cond );
 282     }
 283
 284     p_md->parsed_status = new_status;
 285     if( p_md->parsed_status == libvlc_media_parsed_status_skipped )
 286         p_md->has_asked_preparse = false;
 287
 288     vlc_mutex_unlock( &p_md->parsed_lock );
 289
 290     if( new_status == libvlc_media_parsed_status_done )
 291     {
 292         libvlc_media_list_t *p_subitems = media_get_subitems( p_md, false );
 293         if( p_subitems != NULL )
 294         {
 295             /* notify the media list */
 296             libvlc_media_list_lock( p_subitems );
 297             libvlc_media_list_internal_end_reached( p_subitems );
 298             libvlc_media_list_unlock( p_subitems );
 299         }
 300     }
 301
 302     /* Construct the event */
 303     event.type = libvlc_MediaParsedChanged;
 304     event.u.media_parsed_changed.new_status = new_status;
 305
 306     /* Send the event */
 307     libvlc_event_send( &p_md->event_manager, &event );
 308 }
 309
 310 /**************************************************************************
 311  * input_item_preparse_ended (Private) (vlc event Callback)
 312  **************************************************************************/
 313 static void input_item_preparse_ended(input_item_t *item,
 314                                       enum input_item_preparse_status status,
 315                                       void *user_data)
 316 {
 317     VLC_UNUSED(item);
 318     libvlc_media_t * p_md = user_data;
 319     libvlc_media_parsed_status_t new_status;
 320
 321     switch( status )
 322     {
 323         case ITEM_PREPARSE_SKIPPED:
 324             new_status = libvlc_media_parsed_status_skipped;
 325             break;
 326         case ITEM_PREPARSE_FAILED:
 327             new_status = libvlc_media_parsed_status_failed;
 328             break;
 329         case ITEM_PREPARSE_TIMEOUT:
 330             new_status = libvlc_media_parsed_status_timeout;
 331             break;
 332         case ITEM_PREPARSE_DONE:
 333             new_status = libvlc_media_parsed_status_done;
 334             break;
 335         default:
 336             return;
 337     }
 338     send_parsed_changed( p_md, new_status );
 339 }
 340
 341 /**************************************************************************
 342  * Install event handler (Private)
 343  **************************************************************************/
 344 static void install_input_item_observer( libvlc_media_t *p_md )
 345 {
 346     vlc_event_attach( &p_md->p_input_item->event_manager,
 347                       vlc_InputItemMetaChanged,
 348                       input_item_meta_changed,
 349                       p_md );
 350     vlc_event_attach( &p_md->p_input_item->event_manager,
 351                       vlc_InputItemDurationChanged,
 352                       input_item_duration_changed,
 353                       p_md );
 354 }
 355
 356 /**************************************************************************
 357  * Uninstall event handler (Private)
 358  **************************************************************************/
 359 static void uninstall_input_item_observer( libvlc_media_t *p_md )
 360 {
 361     vlc_event_detach( &p_md->p_input_item->event_manager,
 362                       vlc_InputItemMetaChanged,
 363                       input_item_meta_changed,
 364                       p_md );
 365     vlc_event_detach( &p_md->p_input_item->event_manager,
 366                       vlc_InputItemDurationChanged,
 367                       input_item_duration_changed,
 368                       p_md );
 369 }
 370
 371 /**************************************************************************
 372  * Create a new media descriptor object from an input_item
 373  * (libvlc internal)
 374  * That's the generic constructor
 375  **************************************************************************/
 376 libvlc_media_t * libvlc_media_new_from_input_item(
 377                                    libvlc_instance_t *p_instance,
 378                                    input_item_t *p_input_item )
 379 {
 380     libvlc_media_t * p_md;
 381
 382     if (!p_input_item)
 383     {
 384         libvlc_printerr( "No input item given" );
 385         return NULL;
 386     }
 387
 388     p_md = calloc( 1, sizeof(libvlc_media_t) );
 389     if( !p_md )
 390     {
 391         libvlc_printerr( "Not enough memory" );
 392         return NULL;
 393     }
 394
 395     p_md->p_libvlc_instance = p_instance;
 396     p_md->p_input_item      = p_input_item;
 397     p_md->i_refcount        = 1;
 398
 399     vlc_cond_init(&p_md->parsed_cond);
 400     vlc_mutex_init(&p_md->parsed_lock);
 401     vlc_mutex_init(&p_md->subitems_lock);
 402
 403     p_md->state = libvlc_NothingSpecial;
 404
 405     /* A media descriptor can be a playlist. When you open a playlist
 406      * It can give a bunch of item to read. */
 407     p_md->p_subitems        = NULL;
 408
 409     libvlc_event_manager_init( &p_md->event_manager, p_md );
 410
 411     input_item_Hold( p_md->p_input_item );
 412
 413     install_input_item_observer( p_md );
 414
 415     libvlc_retain( p_instance );
 416     return p_md;
 417 }
 418
 419 /**************************************************************************
 420  * Create a new media descriptor object
 421  **************************************************************************/
 422 libvlc_media_t *libvlc_media_new_location( libvlc_instance_t *p_instance,
 423                                            const char * psz_mrl )
 424 {
 425     input_item_t * p_input_item;
 426     libvlc_media_t * p_md;
 427
 428     p_input_item = input_item_New( psz_mrl, NULL );
 429
 430     if (!p_input_item)
 431     {
 432         libvlc_printerr( "Not enough memory" );
 433         return NULL;
 434     }
 435
 436     p_md = libvlc_media_new_from_input_item( p_instance, p_input_item );
 437
 438     /* The p_input_item is retained in libvlc_media_new_from_input_item */
 439     input_item_Release( p_input_item );
 440
 441     return p_md;
 442 }
 443
 444 libvlc_media_t *libvlc_media_new_path( libvlc_instance_t *p_instance,
 445                                        const char *path )
 446 {
 447     char *mrl = vlc_path2uri( path, NULL );
 448     if( unlikely(mrl == NULL) )
 449     {
 450         libvlc_printerr( "%s", vlc_strerror_c(errno) );
 451         return NULL;
 452     }
 453
 454     libvlc_media_t *m = libvlc_media_new_location( p_instance, mrl );
 455     free( mrl );
 456     return m;
 457 }
 458
 459 libvlc_media_t *libvlc_media_new_fd( libvlc_instance_t *p_instance, int fd )
 460 {
 461     char mrl[16];
 462     snprintf( mrl, sizeof(mrl), "fd://%d", fd );
 463
 464     return libvlc_media_new_location( p_instance, mrl );
 465 }
 466
 467 libvlc_media_t *libvlc_media_new_callbacks(libvlc_instance_t *p_instance,
 468                                            libvlc_media_open_cb open_cb,
 469                                            libvlc_media_read_cb read_cb,
 470                                            libvlc_media_seek_cb seek_cb,
 471                                            libvlc_media_close_cb close_cb,
 472                                            void *opaque)
 473 {
 474     libvlc_media_t *m = libvlc_media_new_location(p_instance, "imem://");
 475     if (unlikely(m == NULL))
 476         return NULL;
 477
 478     assert(read_cb != NULL);
 479     input_item_AddOpaque(m->p_input_item, "imem-data", opaque);
 480     input_item_AddOpaque(m->p_input_item, "imem-open", open_cb);
 481     input_item_AddOpaque(m->p_input_item, "imem-read", read_cb);
 482     input_item_AddOpaque(m->p_input_item, "imem-seek", seek_cb);
 483     input_item_AddOpaque(m->p_input_item, "imem-close", close_cb);
 484     return m;
 485 }
 486
 487 /**************************************************************************
 488  * Create a new media descriptor object
 489  **************************************************************************/
 490 libvlc_media_t * libvlc_media_new_as_node( libvlc_instance_t *p_instance,
 491                                            const char * psz_name )
 492 {
 493     input_item_t * p_input_item;
 494     libvlc_media_t * p_md;
 495     libvlc_media_list_t * p_subitems;
 496
 497     p_input_item = input_item_New( INPUT_ITEM_URI_NOP, psz_name );
 498
 499     if (!p_input_item)
 500     {
 501         libvlc_printerr( "Not enough memory" );
 502         return NULL;
 503     }
 504
 505     p_md = libvlc_media_new_from_input_item( p_instance, p_input_item );
 506     input_item_Release( p_input_item );
 507
 508     p_subitems = media_get_subitems( p_md, true );
 509     if( p_subitems == NULL) {
 510         libvlc_media_release( p_md );
 511         return NULL;
 512     }
 513
 514     return p_md;
 515 }
 516
 517 /**************************************************************************
 518  * Add an option to the media descriptor,
 519  * that will be used to determine how the media_player will read the
 520  * media. This allow to use VLC advanced reading/streaming
 521  * options in a per-media basis
 522  *
 523  * The options are detailled in vlc --long-help, for instance "--sout-all"
 524  **************************************************************************/
 525 void libvlc_media_add_option( libvlc_media_t * p_md,
 526                               const char * psz_option )
 527 {
 528     libvlc_media_add_option_flag( p_md, psz_option,
 529                           VLC_INPUT_OPTION_UNIQUE|VLC_INPUT_OPTION_TRUSTED );
 530 }
 531
 532 /**************************************************************************
 533  * Same as libvlc_media_add_option but with configurable flags.
 534  **************************************************************************/
 535 void libvlc_media_add_option_flag( libvlc_media_t * p_md,
 536                                    const char * ppsz_option,
 537                                    unsigned i_flags )
 538 {
 539     input_item_AddOption( p_md->p_input_item, ppsz_option, i_flags );
 540 }
 541
 542 /**************************************************************************
 543  * Delete a media descriptor object
 544  **************************************************************************/
 545 void libvlc_media_release( libvlc_media_t *p_md )
 546 {
 547     if (!p_md)
 548         return;
 549
 550     p_md->i_refcount--;
 551
 552     if( p_md->i_refcount > 0 )
 553         return;
 554
 555     uninstall_input_item_observer( p_md );
 556
 557     /* Cancel asynchronous parsing (if any) */
 558     libvlc_MetadataCancel( p_md->p_libvlc_instance->p_libvlc_int, p_md );
 559
 560     if( p_md->p_subitems )
 561         libvlc_media_list_release( p_md->p_subitems );
 562
 563     input_item_Release( p_md->p_input_item );
 564
 565     vlc_cond_destroy( &p_md->parsed_cond );
 566     vlc_mutex_destroy( &p_md->parsed_lock );
 567     vlc_mutex_destroy( &p_md->subitems_lock );
 568
 569     /* Construct the event */
 570     libvlc_event_t event;
 571     event.type = libvlc_MediaFreed;
 572     event.u.media_freed.md = p_md;
 573
 574     /* Send the event */
 575     libvlc_event_send( &p_md->event_manager, &event );
 576
 577     libvlc_event_manager_destroy( &p_md->event_manager );
 578     libvlc_release( p_md->p_libvlc_instance );
 579     free( p_md );
 580 }
 581
 582 /**************************************************************************
 583  * Retain a media descriptor object
 584  **************************************************************************/
 585 void libvlc_media_retain( libvlc_media_t *p_md )
 586 {
 587     assert (p_md);
 588     p_md->i_refcount++;
 589 }
 590
 591 /**************************************************************************
 592  * Duplicate a media descriptor object
 593  **************************************************************************/
 594 libvlc_media_t *
 595 libvlc_media_duplicate( libvlc_media_t *p_md_orig )
 596 {
 597     return libvlc_media_new_from_input_item(
 598         p_md_orig->p_libvlc_instance, p_md_orig->p_input_item );
 599 }
 600
 601 /**************************************************************************
 602  * Get mrl from a media descriptor object
 603  **************************************************************************/
 604 char *
 605 libvlc_media_get_mrl( libvlc_media_t * p_md )
 606 {
 607     assert( p_md );
 608     return input_item_GetURI( p_md->p_input_item );
 609 }
 610
 611 /**************************************************************************
 612  * Getter for meta information
 613  **************************************************************************/
 614
 615 char *libvlc_media_get_meta( libvlc_media_t *p_md, libvlc_meta_t e_meta )
 616 {
 617     char *psz_meta = NULL;
 618
 619     if( e_meta == libvlc_meta_NowPlaying )
 620     {
 621         psz_meta = input_item_GetNowPlayingFb( p_md->p_input_item );
 622     }
 623     else
 624     {
 625         psz_meta = input_item_GetMeta( p_md->p_input_item,
 626                                              libvlc_to_vlc_meta[e_meta] );
 627         /* Should be integrated in core */
 628         if( psz_meta == NULL && e_meta == libvlc_meta_Title
 629          && p_md->p_input_item->psz_name != NULL )
 630             psz_meta = strdup( p_md->p_input_item->psz_name );
 631     }
 632     return psz_meta;
 633 }
 634
 635 /**************************************************************************
 636  * Setter for meta information
 637  **************************************************************************/
 638
 639 void libvlc_media_set_meta( libvlc_media_t *p_md, libvlc_meta_t e_meta, const char *psz_value )
 640 {
 641     assert( p_md );
 642     input_item_SetMeta( p_md->p_input_item, libvlc_to_vlc_meta[e_meta], psz_value );
 643 }
 644
 645 int libvlc_media_save_meta( libvlc_media_t *p_md )
 646 {
 647     assert( p_md );
 648     vlc_object_t *p_obj = VLC_OBJECT(p_md->p_libvlc_instance->p_libvlc_int);
 649     return input_item_WriteMeta( p_obj, p_md->p_input_item ) == VLC_SUCCESS;
 650 }
 651
 652 /**************************************************************************
 653  * Getter for state information
 654  * Can be error, playing, buffering, NothingSpecial.
 655  **************************************************************************/
 656
 657 libvlc_state_t
 658 libvlc_media_get_state( libvlc_media_t *p_md )
 659 {
 660     assert( p_md );
 661     return p_md->state;
 662 }
 663
 664 /**************************************************************************
 665  * Setter for state information (LibVLC Internal)
 666  **************************************************************************/
 667
 668 void
 669 libvlc_media_set_state( libvlc_media_t *p_md,
 670                                    libvlc_state_t state )
 671 {
 672     libvlc_event_t event;
 673
 674     p_md->state = state;
 675
 676     /* Construct the event */
 677     event.type = libvlc_MediaStateChanged;
 678     event.u.media_state_changed.new_state = state;
 679
 680     /* Send the event */
 681     libvlc_event_send( &p_md->event_manager, &event );
 682 }
 683
 684 /**************************************************************************
 685  * subitems
 686  **************************************************************************/
 687 libvlc_media_list_t *
 688 libvlc_media_subitems( libvlc_media_t * p_md )
 689 {
 690     libvlc_media_list_t *p_subitems = media_get_subitems( p_md, true );
 691     if( p_subitems )
 692         libvlc_media_list_retain( p_subitems );
 693     return p_subitems;
 694 }
 695
 696 /**************************************************************************
 697  * Getter for statistics information
 698  **************************************************************************/
 699 int libvlc_media_get_stats( libvlc_media_t *p_md,
 700                             libvlc_media_stats_t *p_stats )
 701 {
 702     input_item_t *item = p_md->p_input_item;
 703
 704     if( !p_md->p_input_item )
 705         return false;
 706
 707     vlc_mutex_lock( &item->lock );
 708
 709     input_stats_t *p_itm_stats = p_md->p_input_item->p_stats;
 710     if( p_itm_stats == NULL )
 711     {
 712         vlc_mutex_unlock( &item->lock );
 713         return false;
 714     }
 715
 716     p_stats->i_read_bytes = p_itm_stats->i_read_bytes;
 717     p_stats->f_input_bitrate = p_itm_stats->f_input_bitrate;
 718
 719     p_stats->i_demux_read_bytes = p_itm_stats->i_demux_read_bytes;
 720     p_stats->f_demux_bitrate = p_itm_stats->f_demux_bitrate;
 721     p_stats->i_demux_corrupted = p_itm_stats->i_demux_corrupted;
 722     p_stats->i_demux_discontinuity = p_itm_stats->i_demux_discontinuity;
 723
 724     p_stats->i_decoded_video = p_itm_stats->i_decoded_video;
 725     p_stats->i_decoded_audio = p_itm_stats->i_decoded_audio;
 726
 727     p_stats->i_displayed_pictures = p_itm_stats->i_displayed_pictures;
 728     p_stats->i_lost_pictures = p_itm_stats->i_lost_pictures;
 729
 730     p_stats->i_played_abuffers = p_itm_stats->i_played_abuffers;
 731     p_stats->i_lost_abuffers = p_itm_stats->i_lost_abuffers;
 732
 733     p_stats->i_sent_packets = 0;
 734     p_stats->i_sent_bytes = 0;
 735     p_stats->f_send_bitrate = 0.;
 736
 737     vlc_mutex_unlock( &item->lock );
 738     return true;
 739 }
 740
 741 /**************************************************************************
 742  * event_manager
 743  **************************************************************************/
 744 libvlc_event_manager_t *
 745 libvlc_media_event_manager( libvlc_media_t * p_md )
 746 {
 747     assert( p_md );
 748
 749     return &p_md->event_manager;
 750 }
 751
 752 /**************************************************************************
 753  * Get duration of media object (in ms)
 754  **************************************************************************/
 755 int64_t
 756 libvlc_media_get_duration( libvlc_media_t * p_md )
 757 {
 758     assert( p_md );
 759
 760     if( !p_md->p_input_item )
 761     {
 762         libvlc_printerr( "No input item" );
 763         return -1;
 764     }
 765
 766     if (!input_item_IsPreparsed( p_md->p_input_item ))
 767         return -1;
 768
 769     return from_mtime(input_item_GetDuration( p_md->p_input_item ));
 770 }
 771
 772 static const input_preparser_callbacks_t input_preparser_callbacks = {
 773     .on_preparse_ended = input_item_preparse_ended,
 774     .on_subtree_added = input_item_subtree_added,
 775 };
 776
 777 static int media_parse(libvlc_media_t *media, bool b_async,
 778                        libvlc_media_parse_flag_t parse_flag, int timeout)
 779 {
 780     bool needed;
 781
 782     vlc_mutex_lock(&media->parsed_lock);
 783     needed = !media->has_asked_preparse;
 784     media->has_asked_preparse = true;
 785     if (needed)
 786         media->is_parsed = false;
 787     vlc_mutex_unlock(&media->parsed_lock);
 788
 789     if (needed)
 790     {
 791         libvlc_int_t *libvlc = media->p_libvlc_instance->p_libvlc_int;
 792         input_item_t *item = media->p_input_item;
 793         input_item_meta_request_option_t parse_scope = META_REQUEST_OPTION_SCOPE_LOCAL;
 794         int ret;
 795
 796         /* Ignore libvlc_media_fetch_local flag since local art will be fetched
 797          * by libvlc_MetadataRequest */
 798         if (parse_flag & libvlc_media_fetch_network)
 799         {
 800             ret = libvlc_ArtRequest(libvlc, item,
 801                                     META_REQUEST_OPTION_SCOPE_NETWORK,
 802                                     NULL, NULL);
 803             if (ret != VLC_SUCCESS)
 804                 return ret;
 805         }
 806
 807         if (parse_flag & libvlc_media_parse_network)
 808             parse_scope |= META_REQUEST_OPTION_SCOPE_NETWORK;
 809         if (parse_flag & libvlc_media_do_interact)
 810             parse_scope |= META_REQUEST_OPTION_DO_INTERACT;
 811         ret = libvlc_MetadataRequest(libvlc, item, parse_scope, &input_preparser_callbacks, media, timeout, media);
 812         if (ret != VLC_SUCCESS)
 813             return ret;
 814     }
 815     else
 816         return VLC_EGENERIC;
 817
 818     if (!b_async)
 819     {
 820         vlc_mutex_lock(&media->parsed_lock);
 821         while (!media->is_parsed)
 822             vlc_cond_wait(&media->parsed_cond, &media->parsed_lock);
 823         vlc_mutex_unlock(&media->parsed_lock);
 824     }
 825     return VLC_SUCCESS;
 826 }
 827
 828 /**************************************************************************
 829  * Parse the media and wait.
 830  **************************************************************************/
 831 void
 832 libvlc_media_parse(libvlc_media_t *media)
 833 {
 834     media_parse( media, false, libvlc_media_fetch_local, -1 );
 835 }
 836
 837 /**************************************************************************
 838  * Parse the media but do not wait.
 839  **************************************************************************/
 840 void
 841 libvlc_media_parse_async(libvlc_media_t *media)
 842 {
 843     media_parse( media, true, libvlc_media_fetch_local, -1 );
 844 }
 845
 846 /**************************************************************************
 847  * Parse the media asynchronously with options.
 848  **************************************************************************/
 849 int
 850 libvlc_media_parse_with_options( libvlc_media_t *media,
 851                                  libvlc_media_parse_flag_t parse_flag,
 852                                  int timeout )
 853 {
 854     return media_parse( media, true, parse_flag, timeout ) == VLC_SUCCESS ? 0 : -1;
 855 }
 856
 857 void
 858 libvlc_media_parse_stop( libvlc_media_t *media )
 859 {
 860     libvlc_MetadataCancel( media->p_libvlc_instance->p_libvlc_int, media );
 861 }
 862
 863 /**************************************************************************
 864  * Get parsed status for media object.
 865  **************************************************************************/
 866 int
 867 libvlc_media_is_parsed(libvlc_media_t *media)
 868 {
 869     bool parsed;
 870
 871     vlc_mutex_lock(&media->parsed_lock);
 872     parsed = media->is_parsed;
 873     vlc_mutex_unlock(&media->parsed_lock);
 874     return parsed;
 875 }
 876
 877 libvlc_media_parsed_status_t
 878 libvlc_media_get_parsed_status(libvlc_media_t *media)
 879 {
 880     libvlc_media_parsed_status_t status;
 881
 882     vlc_mutex_lock(&media->parsed_lock);
 883     status = media->parsed_status;
 884     vlc_mutex_unlock(&media->parsed_lock);
 885     return status;
 886 }
 887
 888 /**************************************************************************
 889  * Sets media descriptor's user_data. user_data is specialized data
 890  * accessed by the host application, VLC.framework uses it as a pointer to
 891  * an native object that references a libvlc_media_t pointer
 892  **************************************************************************/
 893 void
 894 libvlc_media_set_user_data( libvlc_media_t * p_md, void * p_new_user_data )
 895 {
 896     assert( p_md );
 897     p_md->p_user_data = p_new_user_data;
 898 }
 899
 900 /**************************************************************************
 901  * Get media descriptor's user_data. user_data is specialized data
 902  * accessed by the host application, VLC.framework uses it as a pointer to
 903  * an native object that references a libvlc_media_t pointer
 904  **************************************************************************/
 905 void *
 906 libvlc_media_get_user_data( libvlc_media_t * p_md )
 907 {
 908     assert( p_md );
 909     return p_md->p_user_data;
 910 }
 911
 912 unsigned
 913 libvlc_media_tracks_get( libvlc_media_t *p_md, libvlc_media_track_t *** pp_es )
 914 {
 915     assert( p_md );
 916
 917     input_item_t *p_input_item = p_md->p_input_item;
 918     vlc_mutex_lock( &p_input_item->lock );
 919
 920     const int i_es = p_input_item->i_es;
 921     *pp_es = (i_es > 0) ? calloc( i_es, sizeof(**pp_es) ) : NULL;
 922
 923     if( !*pp_es ) /* no ES, or OOM */
 924     {
 925         vlc_mutex_unlock( &p_input_item->lock );
 926         return 0;
 927     }
 928
 929     /* Fill array */
 930     for( int i = 0; i < i_es; i++ )
 931     {
 932         libvlc_media_track_t *p_mes = calloc( 1, sizeof(*p_mes) );
 933         if ( p_mes )
 934         {
 935             p_mes->audio = malloc( __MAX(__MAX(sizeof(*p_mes->audio),
 936                                                sizeof(*p_mes->video)),
 937                                                sizeof(*p_mes->subtitle)) );
 938         }
 939         if ( !p_mes || !p_mes->audio )
 940         {
 941             libvlc_media_tracks_release( *pp_es, i_es );
 942             *pp_es = NULL;
 943             free( p_mes );
 944             vlc_mutex_unlock( &p_input_item->lock );
 945             return 0;
 946         }
 947         (*pp_es)[i] = p_mes;
 948
 949         const es_format_t *p_es = p_input_item->es[i];
 950
 951         p_mes->i_codec = p_es->i_codec;
 952         p_mes->i_original_fourcc = p_es->i_original_fourcc;
 953         p_mes->i_id = p_es->i_id;
 954
 955         p_mes->i_profile = p_es->i_profile;
 956         p_mes->i_level = p_es->i_level;
 957
 958         p_mes->i_bitrate = p_es->i_bitrate;
 959         p_mes->psz_language = p_es->psz_language != NULL ? strdup(p_es->psz_language) : NULL;
 960         p_mes->psz_description = p_es->psz_description != NULL ? strdup(p_es->psz_description) : NULL;
 961
 962         switch(p_es->i_cat)
 963         {
 964         case UNKNOWN_ES:
 965         default:
 966             p_mes->i_type = libvlc_track_unknown;
 967             break;
 968         case VIDEO_ES:
 969             p_mes->i_type = libvlc_track_video;
 970             p_mes->video->i_height = p_es->video.i_visible_height;
 971             p_mes->video->i_width = p_es->video.i_visible_width;
 972             p_mes->video->i_sar_num = p_es->video.i_sar_num;
 973             p_mes->video->i_sar_den = p_es->video.i_sar_den;
 974             p_mes->video->i_frame_rate_num = p_es->video.i_frame_rate;
 975             p_mes->video->i_frame_rate_den = p_es->video.i_frame_rate_base;
 976
 977             assert( p_es->video.orientation >= ORIENT_TOP_LEFT &&
 978                     p_es->video.orientation <= ORIENT_RIGHT_BOTTOM );
 979             p_mes->video->i_orientation = (int) p_es->video.orientation;
 980
 981             assert( ( p_es->video.projection_mode >= PROJECTION_MODE_RECTANGULAR &&
 982                     p_es->video.projection_mode <= PROJECTION_MODE_EQUIRECTANGULAR ) ||
 983                     ( p_es->video.projection_mode == PROJECTION_MODE_CUBEMAP_LAYOUT_STANDARD ) );
 984             p_mes->video->i_projection = (int) p_es->video.projection_mode;
 985
 986             p_mes->video->pose.f_yaw = p_es->video.pose.yaw;
 987             p_mes->video->pose.f_pitch = p_es->video.pose.pitch;
 988             p_mes->video->pose.f_roll = p_es->video.pose.roll;
 989             p_mes->video->pose.f_field_of_view = p_es->video.pose.fov;
 990
 991             assert( p_es->video.multiview_mode >= MULTIVIEW_2D &&
 992                     p_es->video.multiview_mode <= MULTIVIEW_STEREO_CHECKERBOARD );
 993             p_mes->video->i_multiview = (int) p_es->video.multiview_mode;
 994             break;
 995         case AUDIO_ES:
 996             p_mes->i_type = libvlc_track_audio;
 997             p_mes->audio->i_channels = p_es->audio.i_channels;
 998             p_mes->audio->i_rate = p_es->audio.i_rate;
 999             break;
1000         case SPU_ES:
1001             p_mes->i_type = libvlc_track_text;
1002             p_mes->subtitle->psz_encoding = p_es->subs.psz_encoding != NULL ?
1003                                             strdup(p_es->subs.psz_encoding) : NULL;
1004             break;
1005         }
1006     }
1007
1008     vlc_mutex_unlock( &p_input_item->lock );
1009     return i_es;
1010 }
1011
1012 /**************************************************************************
1013  * Get codec description from media elementary stream
1014  **************************************************************************/
1015 const char *
1016 libvlc_media_get_codec_description( libvlc_track_type_t i_type,
1017                                     uint32_t i_codec )
1018 {
1019     switch( i_type )
1020     {
1021         case libvlc_track_audio:
1022             return vlc_fourcc_GetDescription( AUDIO_ES, i_codec );
1023         case libvlc_track_video:
1024             return vlc_fourcc_GetDescription( VIDEO_ES, i_codec );
1025         case libvlc_track_text:
1026             return vlc_fourcc_GetDescription( SPU_ES, i_codec );
1027         case libvlc_track_unknown:
1028         default:
1029             return vlc_fourcc_GetDescription( UNKNOWN_ES, i_codec );
1030     }
1031 }
1032
1033 /**************************************************************************
1034  * Release media descriptor's elementary streams description array
1035  **************************************************************************/
1036 void libvlc_media_tracks_release( libvlc_media_track_t **p_tracks, unsigned i_count )
1037 {
1038     for( unsigned i = 0; i < i_count; ++i )
1039     {
1040         if ( !p_tracks[i] )
1041             continue;
1042         free( p_tracks[i]->psz_language );
1043         free( p_tracks[i]->psz_description );
1044         switch( p_tracks[i]->i_type )
1045         {
1046         case libvlc_track_audio:
1047             break;
1048         case libvlc_track_video:
1049             break;
1050         case libvlc_track_text:
1051             free( p_tracks[i]->subtitle->psz_encoding );
1052             break;
1053         case libvlc_track_unknown:
1054         default:
1055             break;
1056         }
1057         free( p_tracks[i]->audio );
1058         free( p_tracks[i] );
1059     }
1060     free( p_tracks );
1061 }
1062
1063 /**************************************************************************
1064  * Get the media type of the media descriptor object
1065  **************************************************************************/
1066 libvlc_media_type_t libvlc_media_get_type( libvlc_media_t *p_md )
1067 {
1068     assert( p_md );
1069
1070     enum input_item_type_e i_type;
1071     input_item_t *p_input_item = p_md->p_input_item;
1072
1073     vlc_mutex_lock( &p_input_item->lock );
1074     i_type = p_md->p_input_item->i_type;
1075     vlc_mutex_unlock( &p_input_item->lock );
1076
1077     switch( i_type )
1078     {
1079     case ITEM_TYPE_FILE:
1080         return libvlc_media_type_file;
1081     case ITEM_TYPE_NODE:
1082     case ITEM_TYPE_DIRECTORY:
1083         return libvlc_media_type_directory;
1084     case ITEM_TYPE_DISC:
1085         return libvlc_media_type_disc;
1086     case ITEM_TYPE_STREAM:
1087         return libvlc_media_type_stream;
1088     case ITEM_TYPE_PLAYLIST:
1089         return libvlc_media_type_playlist;
1090     default:
1091         return libvlc_media_type_unknown;
1092     }
1093 }
1094
1095 int libvlc_media_slaves_add( libvlc_media_t *p_md,
1096                              libvlc_media_slave_type_t i_type,
1097                              unsigned int i_priority,
1098                              const char *psz_uri )
1099 {
1100     assert( p_md && psz_uri );
1101     input_item_t *p_input_item = p_md->p_input_item;
1102
1103     enum slave_type i_input_slave_type;
1104     switch( i_type )
1105     {
1106     case libvlc_media_slave_type_subtitle:
1107         i_input_slave_type = SLAVE_TYPE_SPU;
1108         break;
1109     case libvlc_media_slave_type_audio:
1110         i_input_slave_type = SLAVE_TYPE_AUDIO;
1111         break;
1112     default:
1113         vlc_assert_unreachable();
1114         return -1;
1115     }
1116
1117     enum slave_priority i_input_slave_priority;
1118     switch( i_priority )
1119     {
1120     case 0:
1121         i_input_slave_priority = SLAVE_PRIORITY_MATCH_NONE;
1122         break;
1123     case 1:
1124         i_input_slave_priority = SLAVE_PRIORITY_MATCH_RIGHT;
1125         break;
1126     case 2:
1127         i_input_slave_priority = SLAVE_PRIORITY_MATCH_LEFT;
1128         break;
1129     case 3:
1130         i_input_slave_priority = SLAVE_PRIORITY_MATCH_ALL;
1131         break;
1132     default:
1133     case 4:
1134         i_input_slave_priority = SLAVE_PRIORITY_USER;
1135         break;
1136     }
1137
1138     input_item_slave_t *p_slave = input_item_slave_New( psz_uri,
1139                                                       i_input_slave_type,
1140                                                       i_input_slave_priority );
1141     if( p_slave == NULL )
1142         return -1;
1143     return input_item_AddSlave( p_input_item, p_slave ) == VLC_SUCCESS ? 0 : -1;
1144 }
1145
1146 void libvlc_media_slaves_clear( libvlc_media_t *p_md )
1147 {
1148     assert( p_md );
1149     input_item_t *p_input_item = p_md->p_input_item;
1150
1151     vlc_mutex_lock( &p_input_item->lock );
1152     for( int i = 0; i < p_input_item->i_slaves; i++ )
1153         input_item_slave_Delete( p_input_item->pp_slaves[i] );
1154     TAB_CLEAN( p_input_item->i_slaves, p_input_item->pp_slaves );
1155     vlc_mutex_unlock( &p_input_item->lock );
1156 }
1157
1158 unsigned int libvlc_media_slaves_get( libvlc_media_t *p_md,
1159                                       libvlc_media_slave_t ***ppp_slaves )
1160 {
1161     assert( p_md && ppp_slaves );
1162     input_item_t *p_input_item = p_md->p_input_item;
1163     *ppp_slaves = NULL;
1164
1165     vlc_mutex_lock( &p_input_item->lock );
1166
1167     int i_count = p_input_item->i_slaves;
1168     if( i_count <= 0 )
1169         return vlc_mutex_unlock( &p_input_item->lock ), 0;
1170
1171     libvlc_media_slave_t **pp_slaves = calloc( i_count, sizeof(*pp_slaves) );
1172     if( pp_slaves == NULL )
1173         return vlc_mutex_unlock( &p_input_item->lock ), 0;
1174
1175     for( int i = 0; i < i_count; ++i )
1176     {
1177         input_item_slave_t *p_item_slave = p_input_item->pp_slaves[i];
1178         assert( p_item_slave->i_priority >= SLAVE_PRIORITY_MATCH_NONE );
1179
1180         /* also allocate psz_uri buffer at the end of the struct */
1181         libvlc_media_slave_t *p_slave = malloc( sizeof(*p_slave) +
1182                                                 strlen( p_item_slave->psz_uri )
1183                                                 + 1 );
1184         if( p_slave == NULL )
1185         {
1186             libvlc_media_slaves_release(pp_slaves, i);
1187             return vlc_mutex_unlock( &p_input_item->lock ), 0;
1188         }
1189         p_slave->psz_uri = (char *) ((uint8_t *)p_slave) + sizeof(*p_slave);
1190         strcpy( p_slave->psz_uri, p_item_slave->psz_uri );
1191
1192         switch( p_item_slave->i_type )
1193         {
1194         case SLAVE_TYPE_SPU:
1195             p_slave->i_type = libvlc_media_slave_type_subtitle;
1196             break;
1197         case SLAVE_TYPE_AUDIO:
1198             p_slave->i_type = libvlc_media_slave_type_audio;
1199             break;
1200         default:
1201             vlc_assert_unreachable();
1202         }
1203
1204         switch( p_item_slave->i_priority )
1205         {
1206         case SLAVE_PRIORITY_MATCH_NONE:
1207             p_slave->i_priority = 0;
1208             break;
1209         case SLAVE_PRIORITY_MATCH_RIGHT:
1210             p_slave->i_priority = 1;
1211             break;
1212         case SLAVE_PRIORITY_MATCH_LEFT:
1213             p_slave->i_priority = 2;
1214             break;
1215         case SLAVE_PRIORITY_MATCH_ALL:
1216             p_slave->i_priority = 3;
1217             break;
1218         case SLAVE_PRIORITY_USER:
1219             p_slave->i_priority = 4;
1220             break;
1221         default:
1222             vlc_assert_unreachable();
1223         }
1224         pp_slaves[i] = p_slave;
1225     }
1226     vlc_mutex_unlock( &p_input_item->lock );
1227
1228     *ppp_slaves = pp_slaves;
1229     return i_count;
1230 }
1231
1232 void libvlc_media_slaves_release( libvlc_media_slave_t **pp_slaves,
1233                                   unsigned int i_count )
1234 {
1235     if( i_count > 0 )
1236     {
1237         assert( pp_slaves );
1238         for( unsigned int i = 0; i < i_count; ++i )
1239             free( pp_slaves[i] );
1240     }
1241     free( pp_slaves );
1242 }