git.sesse.net Git - vlc/blob - 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
  40 #include "libvlc.h"
  41
  42 #include "libvlc_internal.h"
  43 #include "media_internal.h"
  44
  45 static const vlc_meta_type_t libvlc_to_vlc_meta[] =
  46 {
  47     [libvlc_meta_Title]        = vlc_meta_Title,
  48     [libvlc_meta_Artist]       = vlc_meta_Artist,
  49     [libvlc_meta_Genre]        = vlc_meta_Genre,
  50     [libvlc_meta_Copyright]    = vlc_meta_Copyright,
  51     [libvlc_meta_Album]        = vlc_meta_Album,
  52     [libvlc_meta_TrackNumber]  = vlc_meta_TrackNumber,
  53     [libvlc_meta_Description]  = vlc_meta_Description,
  54     [libvlc_meta_Rating]       = vlc_meta_Rating,
  55     [libvlc_meta_Date]         = vlc_meta_Date,
  56     [libvlc_meta_Setting]      = vlc_meta_Setting,
  57     [libvlc_meta_URL]          = vlc_meta_URL,
  58     [libvlc_meta_Language]     = vlc_meta_Language,
  59     [libvlc_meta_NowPlaying]   = vlc_meta_NowPlaying,
  60     [libvlc_meta_Publisher]    = vlc_meta_Publisher,
  61     [libvlc_meta_EncodedBy]    = vlc_meta_EncodedBy,
  62     [libvlc_meta_ArtworkURL]   = vlc_meta_ArtworkURL,
  63     [libvlc_meta_TrackID]      = vlc_meta_TrackID
  64 };
  65
  66 static const libvlc_meta_t vlc_to_libvlc_meta[] =
  67 {
  68     [vlc_meta_Title]        = libvlc_meta_Title,
  69     [vlc_meta_Artist]       = libvlc_meta_Artist,
  70     [vlc_meta_Genre]        = libvlc_meta_Genre,
  71     [vlc_meta_Copyright]    = libvlc_meta_Copyright,
  72     [vlc_meta_Album]        = libvlc_meta_Album,
  73     [vlc_meta_TrackNumber]  = libvlc_meta_TrackNumber,
  74     [vlc_meta_Description]  = libvlc_meta_Description,
  75     [vlc_meta_Rating]       = libvlc_meta_Rating,
  76     [vlc_meta_Date]         = libvlc_meta_Date,
  77     [vlc_meta_Setting]      = libvlc_meta_Setting,
  78     [vlc_meta_URL]          = libvlc_meta_URL,
  79     [vlc_meta_Language]     = libvlc_meta_Language,
  80     [vlc_meta_NowPlaying]   = libvlc_meta_NowPlaying,
  81     [vlc_meta_Publisher]    = libvlc_meta_Publisher,
  82     [vlc_meta_EncodedBy]    = libvlc_meta_EncodedBy,
  83     [vlc_meta_ArtworkURL]   = libvlc_meta_ArtworkURL,
  84     [vlc_meta_TrackID]      = libvlc_meta_TrackID
  85 };
  86
  87 /**************************************************************************
  88  * input_item_subitem_added (Private) (vlc event Callback)
  89  **************************************************************************/
  90 static void input_item_subitem_added( const vlc_event_t *p_event,
  91                                        void * user_data )
  92 {
  93     libvlc_media_t * p_md = user_data;
  94     libvlc_media_t * p_md_child;
  95     libvlc_event_t event;
  96
  97     p_md_child = libvlc_media_new_from_input_item(
  98                 p_md->p_libvlc_instance,
  99                 p_event->u.input_item_subitem_added.p_new_child, NULL );
 100
 101     /* Add this to our media list */
 102     if( !p_md->p_subitems )
 103     {
 104         p_md->p_subitems = libvlc_media_list_new( p_md->p_libvlc_instance, NULL );
 105         libvlc_media_list_set_media( p_md->p_subitems, p_md );
 106     }
 107     if( p_md->p_subitems )
 108     {
 109         libvlc_media_list_add_media( p_md->p_subitems, p_md_child, NULL );
 110     }
 111
 112     /* Construct the event */
 113     event.type = libvlc_MediaSubItemAdded;
 114     event.u.media_subitem_added.new_child = p_md_child;
 115
 116     /* Send the event */
 117     libvlc_event_send( p_md->p_event_manager, &event );
 118     libvlc_media_release( p_md_child );
 119 }
 120
 121 /**************************************************************************
 122  * input_item_meta_changed (Private) (vlc event Callback)
 123  **************************************************************************/
 124 static void input_item_meta_changed( const vlc_event_t *p_event,
 125                                      void * user_data )
 126 {
 127     libvlc_media_t * p_md = user_data;
 128     libvlc_event_t event;
 129
 130     /* Construct the event */
 131     event.type = libvlc_MediaMetaChanged;
 132     event.u.media_meta_changed.meta_type =
 133         vlc_to_libvlc_meta[p_event->u.input_item_meta_changed.meta_type];
 134
 135     /* Send the event */
 136     libvlc_event_send( p_md->p_event_manager, &event );
 137 }
 138
 139 /**************************************************************************
 140  * input_item_duration_changed (Private) (vlc event Callback)
 141  **************************************************************************/
 142 static void input_item_duration_changed( const vlc_event_t *p_event,
 143                                          void * user_data )
 144 {
 145     libvlc_media_t * p_md = user_data;
 146     libvlc_event_t event;
 147
 148     /* Construct the event */
 149     event.type = libvlc_MediaDurationChanged;
 150     event.u.media_duration_changed.new_duration =
 151         from_mtime(p_event->u.input_item_duration_changed.new_duration);
 152
 153     /* Send the event */
 154     libvlc_event_send( p_md->p_event_manager, &event );
 155 }
 156
 157 /**************************************************************************
 158  * input_item_preparsed_changed (Private) (vlc event Callback)
 159  **************************************************************************/
 160 static void input_item_preparsed_changed( const vlc_event_t *p_event,
 161                                           void * user_data )
 162 {
 163     libvlc_media_t * p_md = user_data;
 164     libvlc_event_t event;
 165
 166     /* Construct the event */
 167     event.type = libvlc_MediaPreparsedChanged;
 168     event.u.media_preparsed_changed.new_status =
 169         p_event->u.input_item_preparsed_changed.new_status;
 170
 171     /* Send the event */
 172     libvlc_event_send( p_md->p_event_manager, &event );
 173 }
 174
 175 /**************************************************************************
 176  * Install event handler (Private)
 177  **************************************************************************/
 178 static void install_input_item_observer( libvlc_media_t *p_md )
 179 {
 180     vlc_event_attach( &p_md->p_input_item->event_manager,
 181                       vlc_InputItemSubItemAdded,
 182                       input_item_subitem_added,
 183                       p_md );
 184     vlc_event_attach( &p_md->p_input_item->event_manager,
 185                       vlc_InputItemMetaChanged,
 186                       input_item_meta_changed,
 187                       p_md );
 188     vlc_event_attach( &p_md->p_input_item->event_manager,
 189                       vlc_InputItemDurationChanged,
 190                       input_item_duration_changed,
 191                       p_md );
 192     vlc_event_attach( &p_md->p_input_item->event_manager,
 193                       vlc_InputItemPreparsedChanged,
 194                       input_item_preparsed_changed,
 195                       p_md );
 196 }
 197
 198 /**************************************************************************
 199  * Uninstall event handler (Private)
 200  **************************************************************************/
 201 static void uninstall_input_item_observer( libvlc_media_t *p_md )
 202 {
 203     vlc_event_detach( &p_md->p_input_item->event_manager,
 204                       vlc_InputItemSubItemAdded,
 205                       input_item_subitem_added,
 206                       p_md );
 207     vlc_event_detach( &p_md->p_input_item->event_manager,
 208                       vlc_InputItemMetaChanged,
 209                       input_item_meta_changed,
 210                       p_md );
 211     vlc_event_detach( &p_md->p_input_item->event_manager,
 212                       vlc_InputItemDurationChanged,
 213                       input_item_duration_changed,
 214                       p_md );
 215     vlc_event_detach( &p_md->p_input_item->event_manager,
 216                       vlc_InputItemPreparsedChanged,
 217                       input_item_preparsed_changed,
 218                       p_md );
 219 }
 220
 221 /**************************************************************************
 222  * Preparse if not already done (Private)
 223  **************************************************************************/
 224 static void preparse_if_needed( libvlc_media_t *p_md )
 225 {
 226     /* XXX: need some locking here */
 227     if (!p_md->b_preparsed)
 228     {
 229         playlist_PreparseEnqueue(
 230                 libvlc_priv (p_md->p_libvlc_instance->p_libvlc_int)->p_playlist,
 231                 p_md->p_input_item, pl_Unlocked );
 232         p_md->b_preparsed = true;
 233     }
 234 }
 235
 236 /**************************************************************************
 237  * Create a new media descriptor object from an input_item
 238  * (libvlc internal)
 239  * That's the generic constructor
 240  **************************************************************************/
 241 libvlc_media_t * libvlc_media_new_from_input_item(
 242                                    libvlc_instance_t *p_instance,
 243                                    input_item_t *p_input_item,
 244                                    libvlc_exception_t *p_e )
 245 {
 246     libvlc_media_t * p_md;
 247
 248     if (!p_input_item)
 249     {
 250         libvlc_exception_raise( p_e );
 251         libvlc_printerr( "No input item given" );
 252         return NULL;
 253     }
 254
 255     p_md = calloc( 1, sizeof(libvlc_media_t) );
 256     if( !p_md )
 257     {
 258         libvlc_exception_raise( p_e );
 259         libvlc_printerr( "Not enough memory" );
 260         return NULL;
 261     }
 262
 263     p_md->p_libvlc_instance = p_instance;
 264     p_md->p_input_item      = p_input_item;
 265     p_md->i_refcount        = 1;
 266
 267     p_md->state = libvlc_NothingSpecial;
 268
 269     /* A media descriptor can be a playlist. When you open a playlist
 270      * It can give a bunch of item to read. */
 271     p_md->p_subitems        = NULL;
 272
 273     p_md->p_event_manager = libvlc_event_manager_new( p_md, p_instance );
 274     if( unlikely(p_md->p_event_manager == NULL) )
 275     {
 276         free(p_md);
 277         return NULL;
 278     }
 279     libvlc_event_manager_register_event_type( p_md->p_event_manager,
 280         libvlc_MediaMetaChanged );
 281     libvlc_event_manager_register_event_type( p_md->p_event_manager,
 282         libvlc_MediaSubItemAdded );
 283     libvlc_event_manager_register_event_type( p_md->p_event_manager,
 284         libvlc_MediaFreed );
 285     libvlc_event_manager_register_event_type( p_md->p_event_manager,
 286         libvlc_MediaDurationChanged );
 287     libvlc_event_manager_register_event_type( p_md->p_event_manager,
 288         libvlc_MediaStateChanged );
 289
 290     vlc_gc_incref( p_md->p_input_item );
 291
 292     install_input_item_observer( p_md );
 293
 294     return p_md;
 295 }
 296
 297 /**************************************************************************
 298  * Create a new media descriptor object
 299  **************************************************************************/
 300 libvlc_media_t * libvlc_media_new(
 301                                    libvlc_instance_t *p_instance,
 302                                    const char * psz_mrl,
 303                                    libvlc_exception_t *p_e )
 304 {
 305     input_item_t * p_input_item;
 306     libvlc_media_t * p_md;
 307
 308     p_input_item = input_item_New( p_instance->p_libvlc_int, psz_mrl, NULL );
 309
 310     if (!p_input_item)
 311     {
 312         libvlc_exception_raise( p_e );
 313         libvlc_printerr( "Not enough memory" );
 314         return NULL;
 315     }
 316
 317     p_md = libvlc_media_new_from_input_item( p_instance,
 318                 p_input_item, p_e );
 319
 320     /* The p_input_item is retained in libvlc_media_new_from_input_item */
 321     vlc_gc_decref( p_input_item );
 322
 323     return p_md;
 324 }
 325
 326 /**************************************************************************
 327  * Create a new media descriptor object
 328  **************************************************************************/
 329 libvlc_media_t * libvlc_media_new_as_node(
 330                                    libvlc_instance_t *p_instance,
 331                                    const char * psz_name,
 332                                    libvlc_exception_t *p_e )
 333 {
 334     input_item_t * p_input_item;
 335     libvlc_media_t * p_md;
 336
 337     p_input_item = input_item_New( p_instance->p_libvlc_int, "vlc://nop", psz_name );
 338
 339     if (!p_input_item)
 340     {
 341         libvlc_exception_raise( p_e );
 342         libvlc_printerr( "Not enough memory" );
 343         return NULL;
 344     }
 345
 346     p_md = libvlc_media_new_from_input_item( p_instance,
 347                 p_input_item, p_e );
 348
 349     p_md->p_subitems = libvlc_media_list_new( p_md->p_libvlc_instance, NULL );
 350
 351     return p_md;
 352 }
 353
 354 /**************************************************************************
 355  * Add an option to the media descriptor,
 356  * that will be used to determine how the media_player will read the
 357  * media. This allow to use VLC advanced reading/streaming
 358  * options in a per-media basis
 359  *
 360  * The options are detailled in vlc --long-help, for instance "--sout-all"
 361  **************************************************************************/
 362 void libvlc_media_add_option(
 363                                    libvlc_media_t * p_md,
 364                                    const char * psz_option )
 365 {
 366     input_item_AddOption( p_md->p_input_item, psz_option,
 367                           VLC_INPUT_OPTION_UNIQUE|VLC_INPUT_OPTION_TRUSTED );
 368 }
 369
 370 /**************************************************************************
 371  * Same as libvlc_media_add_option but with configurable flags.
 372  **************************************************************************/
 373 void libvlc_media_add_option_flag(
 374                                    libvlc_media_t * p_md,
 375                                    const char * ppsz_option,
 376                                    libvlc_media_option_t i_flags )
 377 {
 378     input_item_AddOption( p_md->p_input_item, ppsz_option,
 379                           i_flags );
 380 }
 381
 382 /**************************************************************************
 383  * Delete a media descriptor object
 384  **************************************************************************/
 385 void libvlc_media_release( libvlc_media_t *p_md )
 386 {
 387     if (!p_md)
 388         return;
 389
 390     p_md->i_refcount--;
 391
 392     if( p_md->i_refcount > 0 )
 393         return;
 394
 395     if( p_md->p_subitems )
 396         libvlc_media_list_release( p_md->p_subitems );
 397
 398     uninstall_input_item_observer( p_md );
 399     vlc_gc_decref( p_md->p_input_item );
 400
 401     /* Construct the event */
 402     libvlc_event_t event;
 403     event.type = libvlc_MediaFreed;
 404     event.u.media_freed.md = p_md;
 405
 406     /* Send the event */
 407     libvlc_event_send( p_md->p_event_manager, &event );
 408
 409     libvlc_event_manager_release( p_md->p_event_manager );
 410
 411     free( p_md );
 412 }
 413
 414 /**************************************************************************
 415  * Retain a media descriptor object
 416  **************************************************************************/
 417 void libvlc_media_retain( libvlc_media_t *p_md )
 418 {
 419     assert (p_md);
 420     p_md->i_refcount++;
 421 }
 422
 423 /**************************************************************************
 424  * Duplicate a media descriptor object
 425  **************************************************************************/
 426 libvlc_media_t *
 427 libvlc_media_duplicate( libvlc_media_t *p_md_orig )
 428 {
 429     return libvlc_media_new_from_input_item(
 430         p_md_orig->p_libvlc_instance, p_md_orig->p_input_item, NULL );
 431 }
 432
 433 /**************************************************************************
 434  * Get mrl from a media descriptor object
 435  **************************************************************************/
 436 char *
 437 libvlc_media_get_mrl( libvlc_media_t * p_md )
 438 {
 439     assert( p_md );
 440     return input_item_GetURI( p_md->p_input_item );
 441 }
 442
 443 /**************************************************************************
 444  * Getter for meta information
 445  **************************************************************************/
 446
 447 char *libvlc_media_get_meta( libvlc_media_t *p_md, libvlc_meta_t e_meta )
 448 {
 449     char * psz_meta;
 450
 451     assert( p_md );
 452     /* XXX: locking */
 453
 454     preparse_if_needed( p_md );
 455
 456     psz_meta = input_item_GetMeta( p_md->p_input_item,
 457                                    libvlc_to_vlc_meta[e_meta] );
 458
 459     if( e_meta == libvlc_meta_ArtworkURL && !psz_meta && !p_md->has_asked_art )
 460     {
 461         p_md->has_asked_art = true;
 462         playlist_AskForArtEnqueue(
 463                 libvlc_priv(p_md->p_libvlc_instance->p_libvlc_int)->p_playlist,
 464                 p_md->p_input_item, pl_Unlocked );
 465     }
 466
 467     /* Should be integrated in core */
 468     if( !psz_meta && e_meta == libvlc_meta_Title && p_md->p_input_item->psz_name )
 469     {
 470         free( psz_meta );
 471         return strdup( p_md->p_input_item->psz_name );
 472     }
 473
 474     return psz_meta;
 475 }
 476
 477 /**************************************************************************
 478  * Setter for meta information
 479  **************************************************************************/
 480
 481 void libvlc_media_set_meta( libvlc_media_t *p_md, libvlc_meta_t e_meta, const char *psz_value )
 482 {
 483     assert( p_md );
 484     input_item_SetMeta( p_md->p_input_item, libvlc_to_vlc_meta[e_meta], psz_value );
 485 }
 486
 487 int libvlc_media_save_meta( libvlc_media_t *p_md )
 488 {
 489     assert( p_md );
 490     vlc_object_t *p_obj = VLC_OBJECT(libvlc_priv(
 491                             p_md->p_libvlc_instance->p_libvlc_int)->p_playlist);
 492     return input_item_WriteMeta( p_obj, p_md->p_input_item ) == VLC_SUCCESS;
 493 }
 494
 495 /**************************************************************************
 496  * Getter for state information
 497  * Can be error, playing, buffering, NothingSpecial.
 498  **************************************************************************/
 499
 500 libvlc_state_t
 501 libvlc_media_get_state( libvlc_media_t *p_md )
 502 {
 503     assert( p_md );
 504     return p_md->state;
 505 }
 506
 507 /**************************************************************************
 508  * Setter for state information (LibVLC Internal)
 509  **************************************************************************/
 510
 511 void
 512 libvlc_media_set_state( libvlc_media_t *p_md,
 513                                    libvlc_state_t state )
 514 {
 515     libvlc_event_t event;
 516
 517     p_md->state = state;
 518
 519     /* Construct the event */
 520     event.type = libvlc_MediaStateChanged;
 521     event.u.media_state_changed.new_state = state;
 522
 523     /* Send the event */
 524     libvlc_event_send( p_md->p_event_manager, &event );
 525 }
 526
 527 /**************************************************************************
 528  * subitems
 529  **************************************************************************/
 530 libvlc_media_list_t *
 531 libvlc_media_subitems( libvlc_media_t * p_md )
 532 {
 533     if( p_md->p_subitems )
 534         libvlc_media_list_retain( p_md->p_subitems );
 535     return p_md->p_subitems;
 536 }
 537
 538 /**************************************************************************
 539  * Getter for statistics information
 540  **************************************************************************/
 541 int libvlc_media_get_stats( libvlc_media_t *p_md,
 542                             libvlc_media_stats_t *p_stats )
 543 {
 544     if( !p_md->p_input_item )
 545         return false;
 546
 547     input_stats_t *p_itm_stats = p_md->p_input_item->p_stats;
 548     vlc_mutex_lock( &p_itm_stats->lock );
 549     p_stats->i_read_bytes = p_itm_stats->i_read_bytes;
 550     p_stats->f_input_bitrate = p_itm_stats->f_input_bitrate;
 551
 552     p_stats->i_demux_read_bytes = p_itm_stats->i_demux_read_bytes;
 553     p_stats->f_demux_bitrate = p_itm_stats->f_demux_bitrate;
 554     p_stats->i_demux_corrupted = p_itm_stats->i_demux_corrupted;
 555     p_stats->i_demux_discontinuity = p_itm_stats->i_demux_discontinuity;
 556
 557     p_stats->i_decoded_video = p_itm_stats->i_decoded_video;
 558     p_stats->i_decoded_audio = p_itm_stats->i_decoded_audio;
 559
 560     p_stats->i_displayed_pictures = p_itm_stats->i_displayed_pictures;
 561     p_stats->i_lost_pictures = p_itm_stats->i_lost_pictures;
 562
 563     p_stats->i_played_abuffers = p_itm_stats->i_played_abuffers;
 564     p_stats->i_lost_abuffers = p_itm_stats->i_lost_abuffers;
 565
 566     p_stats->i_sent_packets = p_itm_stats->i_sent_packets;
 567     p_stats->i_sent_bytes = p_itm_stats->i_sent_bytes;
 568     p_stats->f_send_bitrate = p_itm_stats->f_send_bitrate;
 569     vlc_mutex_unlock( &p_itm_stats->lock );
 570     return true;
 571 }
 572
 573 /**************************************************************************
 574  * event_manager
 575  **************************************************************************/
 576 libvlc_event_manager_t *
 577 libvlc_media_event_manager( libvlc_media_t * p_md )
 578 {
 579     assert( p_md );
 580
 581     return p_md->p_event_manager;
 582 }
 583
 584 /**************************************************************************
 585  * Get duration of media object (in ms)
 586  **************************************************************************/
 587 int64_t
 588 libvlc_media_get_duration( libvlc_media_t * p_md, libvlc_exception_t *p_e )
 589 {
 590     assert( p_md );
 591
 592     if( !p_md->p_input_item )
 593     {
 594         libvlc_exception_raise( p_e );
 595         libvlc_printerr( "No input item" );
 596         return -1;
 597     }
 598
 599     preparse_if_needed( p_md );
 600
 601     if (!input_item_IsPreparsed( p_md->p_input_item ))
 602         return -1;
 603
 604     return from_mtime(input_item_GetDuration( p_md->p_input_item ));
 605 }
 606
 607 /**************************************************************************
 608  * Get preparsed status for media object.
 609  **************************************************************************/
 610 int
 611 libvlc_media_is_preparsed( libvlc_media_t * p_md )
 612 {
 613     assert( p_md );
 614
 615     if( !p_md->p_input_item )
 616         return false;
 617
 618     return input_item_IsPreparsed( p_md->p_input_item );
 619 }
 620
 621 /**************************************************************************
 622  * Sets media descriptor's user_data. user_data is specialized data
 623  * accessed by the host application, VLC.framework uses it as a pointer to
 624  * an native object that references a libvlc_media_t pointer
 625  **************************************************************************/
 626 void
 627 libvlc_media_set_user_data( libvlc_media_t * p_md, void * p_new_user_data )
 628 {
 629     assert( p_md );
 630     p_md->p_user_data = p_new_user_data;
 631 }
 632
 633 /**************************************************************************
 634  * Get media descriptor's user_data. user_data is specialized data
 635  * accessed by the host application, VLC.framework uses it as a pointer to
 636  * an native object that references a libvlc_media_t pointer
 637  **************************************************************************/
 638 void *
 639 libvlc_media_get_user_data( libvlc_media_t * p_md )
 640 {
 641     assert( p_md );
 642     return p_md->p_user_data;
 643 }
 644
 645 /**************************************************************************
 646  * Get media descriptor's elementary streams description
 647  **************************************************************************/
 648 int
 649 libvlc_media_get_es( libvlc_media_t *p_md, libvlc_media_es_t ** pp_es )
 650 {
 651     assert( p_md );
 652
 653     input_item_t *p_input_item = p_md->p_input_item;
 654     vlc_mutex_lock( &p_input_item->lock );
 655
 656     const int i_es = p_input_item->i_es;
 657     *pp_es = (i_es > 0) ? malloc( i_es * sizeof(libvlc_media_es_t) ) : NULL;
 658
 659     if( !pp_es ) /* no ES, or OOM */
 660     {
 661         vlc_mutex_unlock( &p_input_item->lock );
 662         return 0;
 663     }
 664
 665     /* Fill array */
 666     for( int i = 0; i < i_es; i++ )
 667     {
 668         libvlc_media_es_t *p_mes = *pp_es+i;
 669         const es_format_t *p_es = p_input_item->es[i];
 670
 671         p_mes->i_channels = p_mes->i_rate = 0;
 672         p_mes->i_width = p_mes->i_height = 0;
 673
 674
 675         p_mes->i_codec = p_es->i_codec;
 676
 677         p_mes->i_profile = p_es->i_profile;
 678         p_mes->i_level = p_es->i_level;
 679
 680         switch(p_es->i_cat)
 681         {
 682         case UNKNOWN_ES:
 683         default:
 684             p_mes->i_type = libvlc_es_unknown;
 685             break;
 686         case VIDEO_ES:
 687             p_mes->i_type = libvlc_es_video;
 688             p_mes->i_height = p_es->video.i_height;
 689             p_mes->i_width = p_es->video.i_width;
 690             break;
 691         case AUDIO_ES:
 692             p_mes->i_type = libvlc_es_audio;
 693             p_mes->i_channels = p_es->audio.i_channels;
 694             p_mes->i_rate = p_es->audio.i_rate;
 695             break;
 696         case SPU_ES:
 697             p_mes->i_type = libvlc_es_text;
 698             break;
 699         }
 700     }
 701
 702     vlc_mutex_unlock( &p_input_item->lock );
 703     return i_es;
 704 }