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

   1 /*****************************************************************************
   2  * media_player.c: Libvlc API Media Instance management functions
   3  *****************************************************************************
   4  * Copyright (C) 2005-2009 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Clément Stenac <zorglub@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_events.h>
  33
  34 #include <vlc_demux.h>
  35 #include <vlc_input.h>
  36 #include <vlc_vout.h>
  37 #include <vlc_keys.h>
  38
  39 #include "libvlc.h"
  40
  41 #include "libvlc_internal.h"
  42 #include "media_internal.h" // libvlc_media_set_state()
  43 #include "media_player_internal.h"
  44
  45 /*
  46  * mapping of libvlc_navigate_mode_t to vlc_action_t
  47  */
  48 static const vlc_action_t libvlc_navigate_to_action[] =
  49   {
  50     ACTIONID_NAV_ACTIVATE,
  51     ACTIONID_NAV_UP,
  52     ACTIONID_NAV_DOWN,
  53     ACTIONID_NAV_LEFT,
  54     ACTIONID_NAV_RIGHT
  55   };
  56
  57 static const uint32_t libvlc_navigate_to_action_size =                  \
  58   sizeof( libvlc_navigate_to_action ) / sizeof( libvlc_navigate_to_action[0] );
  59
  60
  61 static int
  62 input_seekable_changed( vlc_object_t * p_this, char const * psz_cmd,
  63                         vlc_value_t oldval, vlc_value_t newval,
  64                         void * p_userdata );
  65 static int
  66 input_pausable_changed( vlc_object_t * p_this, char const * psz_cmd,
  67                         vlc_value_t oldval, vlc_value_t newval,
  68                         void * p_userdata );
  69 static int
  70 input_event_changed( vlc_object_t * p_this, char const * psz_cmd,
  71                      vlc_value_t oldval, vlc_value_t newval,
  72                      void * p_userdata );
  73
  74 static int
  75 snapshot_was_taken( vlc_object_t *p_this, char const *psz_cmd,
  76                     vlc_value_t oldval, vlc_value_t newval, void *p_data );
  77
  78 static void libvlc_media_player_destroy( libvlc_media_player_t *p_mi );
  79
  80 /*
  81  * Shortcuts
  82  */
  83
  84 #define register_event(a, b) __register_event(a, libvlc_MediaPlayer ## b)
  85 static inline void __register_event(libvlc_media_player_t *mp, libvlc_event_type_t type)
  86 {
  87     libvlc_event_manager_register_event_type(mp->p_event_manager, type);
  88 }
  89
  90 /*
  91  * The input lock protects the input and input resource pointer.
  92  * It MUST NOT be used from callbacks.
  93  *
  94  * The object lock protects the reset, namely the media and the player state.
  95  * It can, and usually needs to be taken from callbacks.
  96  * The object lock can be acquired under the input lock... and consequently
  97  * the opposite order is STRICTLY PROHIBITED.
  98  */
  99 static inline void lock(libvlc_media_player_t *mp)
 100 {
 101     vlc_mutex_lock(&mp->object_lock);
 102 }
 103
 104 static inline void unlock(libvlc_media_player_t *mp)
 105 {
 106     vlc_mutex_unlock(&mp->object_lock);
 107 }
 108
 109 static inline void lock_input(libvlc_media_player_t *mp)
 110 {
 111     vlc_mutex_lock(&mp->input.lock);
 112 }
 113
 114 static inline void unlock_input(libvlc_media_player_t *mp)
 115 {
 116     vlc_mutex_unlock(&mp->input.lock);
 117 }
 118
 119 /*
 120  * Release the associated input thread.
 121  *
 122  * Object lock is NOT held.
 123  * Input lock is held or instance is being destroyed.
 124  */
 125 static void release_input_thread( libvlc_media_player_t *p_mi, bool b_input_abort )
 126 {
 127     assert( p_mi );
 128
 129     input_thread_t *p_input_thread = p_mi->input.p_thread;
 130     if( !p_input_thread )
 131         return;
 132
 133     var_DelCallback( p_input_thread, "can-seek",
 134                      input_seekable_changed, p_mi );
 135     var_DelCallback( p_input_thread, "can-pause",
 136                     input_pausable_changed, p_mi );
 137     var_DelCallback( p_input_thread, "intf-event",
 138                      input_event_changed, p_mi );
 139
 140     /* We owned this one */
 141     input_Stop( p_input_thread, b_input_abort );
 142
 143     vlc_thread_join( p_input_thread );
 144
 145     assert( p_input_thread->b_dead );
 146
 147     p_mi->input.p_thread = NULL;
 148     vlc_object_release( p_input_thread );
 149 }
 150
 151 /*
 152  * Retrieve the input thread. Be sure to release the object
 153  * once you are done with it. (libvlc Internal)
 154  */
 155 input_thread_t *libvlc_get_input_thread( libvlc_media_player_t *p_mi )
 156 {
 157     input_thread_t *p_input_thread;
 158
 159     assert( p_mi );
 160
 161     lock_input(p_mi);
 162     p_input_thread = p_mi->input.p_thread;
 163     if( p_input_thread )
 164         vlc_object_hold( p_input_thread );
 165     else
 166         libvlc_printerr( "No active input" );
 167     unlock_input(p_mi);
 168
 169     return p_input_thread;
 170 }
 171
 172 /*
 173  * Set the internal state of the media_player. (media player Internal)
 174  *
 175  * Function will lock the media_player.
 176  */
 177 static void set_state( libvlc_media_player_t *p_mi, libvlc_state_t state,
 178     bool b_locked )
 179 {
 180     if(!b_locked)
 181         lock(p_mi);
 182     p_mi->state = state;
 183
 184     libvlc_media_t *media = p_mi->p_md;
 185     if (media)
 186         libvlc_media_retain(media);
 187
 188     if(!b_locked)
 189         unlock(p_mi);
 190
 191     if (media)
 192     {
 193         // Also set the state of the corresponding media
 194         // This is strictly for convenience.
 195         libvlc_media_set_state(media, state);
 196
 197         libvlc_media_release(media);
 198     }
 199 }
 200
 201 static int
 202 input_seekable_changed( vlc_object_t * p_this, char const * psz_cmd,
 203                         vlc_value_t oldval, vlc_value_t newval,
 204                         void * p_userdata )
 205 {
 206     VLC_UNUSED(oldval);
 207     VLC_UNUSED(p_this);
 208     VLC_UNUSED(psz_cmd);
 209     libvlc_media_player_t * p_mi = p_userdata;
 210     libvlc_event_t event;
 211
 212     event.type = libvlc_MediaPlayerSeekableChanged;
 213     event.u.media_player_seekable_changed.new_seekable = newval.b_bool;
 214
 215     libvlc_event_send( p_mi->p_event_manager, &event );
 216     return VLC_SUCCESS;
 217 }
 218
 219 static int
 220 input_pausable_changed( vlc_object_t * p_this, char const * psz_cmd,
 221                         vlc_value_t oldval, vlc_value_t newval,
 222                         void * p_userdata )
 223 {
 224     VLC_UNUSED(oldval);
 225     VLC_UNUSED(p_this);
 226     VLC_UNUSED(psz_cmd);
 227     libvlc_media_player_t * p_mi = p_userdata;
 228     libvlc_event_t event;
 229
 230     event.type = libvlc_MediaPlayerPausableChanged;
 231     event.u.media_player_pausable_changed.new_pausable = newval.b_bool;
 232
 233     libvlc_event_send( p_mi->p_event_manager, &event );
 234     return VLC_SUCCESS;
 235 }
 236
 237 static int
 238 input_event_changed( vlc_object_t * p_this, char const * psz_cmd,
 239                      vlc_value_t oldval, vlc_value_t newval,
 240                      void * p_userdata )
 241 {
 242     VLC_UNUSED(oldval);
 243     input_thread_t * p_input = (input_thread_t *)p_this;
 244     libvlc_media_player_t * p_mi = p_userdata;
 245     libvlc_event_t event;
 246
 247     assert( !strcmp( psz_cmd, "intf-event" ) );
 248
 249     if( newval.i_int == INPUT_EVENT_STATE )
 250     {
 251         libvlc_state_t libvlc_state;
 252
 253         switch ( var_GetInteger( p_input, "state" ) )
 254         {
 255             case INIT_S:
 256                 libvlc_state = libvlc_NothingSpecial;
 257                 event.type = libvlc_MediaPlayerNothingSpecial;
 258                 break;
 259             case OPENING_S:
 260                 libvlc_state = libvlc_Opening;
 261                 event.type = libvlc_MediaPlayerOpening;
 262                 break;
 263             case PLAYING_S:
 264                 libvlc_state = libvlc_Playing;
 265                 event.type = libvlc_MediaPlayerPlaying;
 266                 break;
 267             case PAUSE_S:
 268                 libvlc_state = libvlc_Paused;
 269                 event.type = libvlc_MediaPlayerPaused;
 270                 break;
 271             case END_S:
 272                 libvlc_state = libvlc_Ended;
 273                 event.type = libvlc_MediaPlayerEndReached;
 274                 break;
 275             case ERROR_S:
 276                 libvlc_state = libvlc_Error;
 277                 event.type = libvlc_MediaPlayerEncounteredError;
 278                 break;
 279
 280             default:
 281                 return VLC_SUCCESS;
 282         }
 283
 284         set_state( p_mi, libvlc_state, false );
 285         libvlc_event_send( p_mi->p_event_manager, &event );
 286     }
 287     else if( newval.i_int == INPUT_EVENT_ABORT )
 288     {
 289         libvlc_state_t libvlc_state = libvlc_Stopped;
 290         event.type = libvlc_MediaPlayerStopped;
 291
 292         set_state( p_mi, libvlc_state, false );
 293         libvlc_event_send( p_mi->p_event_manager, &event );
 294     }
 295     else if( newval.i_int == INPUT_EVENT_POSITION )
 296     {
 297         if( var_GetInteger( p_input, "state" ) != PLAYING_S )
 298             return VLC_SUCCESS; /* Don't send the position while stopped */
 299
 300         /* */
 301         event.type = libvlc_MediaPlayerPositionChanged;
 302         event.u.media_player_position_changed.new_position =
 303                                           var_GetFloat( p_input, "position" );
 304         libvlc_event_send( p_mi->p_event_manager, &event );
 305
 306         /* */
 307         event.type = libvlc_MediaPlayerTimeChanged;
 308         event.u.media_player_time_changed.new_time =
 309            from_mtime(var_GetTime( p_input, "time" ));
 310         libvlc_event_send( p_mi->p_event_manager, &event );
 311     }
 312     else if( newval.i_int == INPUT_EVENT_LENGTH )
 313     {
 314         event.type = libvlc_MediaPlayerLengthChanged;
 315         event.u.media_player_length_changed.new_length =
 316            from_mtime(var_GetTime( p_input, "length" ));
 317         libvlc_event_send( p_mi->p_event_manager, &event );
 318     }
 319     else if( newval.i_int == INPUT_EVENT_CACHE )
 320     {
 321         event.type = libvlc_MediaPlayerBuffering;
 322         event.u.media_player_buffering.new_cache = (int)(100 *
 323             var_GetFloat( p_input, "cache" ));
 324         libvlc_event_send( p_mi->p_event_manager, &event );
 325     }
 326
 327     return VLC_SUCCESS;
 328 }
 329
 330 /**************************************************************************
 331  * Snapshot Taken Event.
 332  *
 333  * FIXME: This snapshot API interface makes no sense in media_player.
 334  *************************************************************************/
 335 static int snapshot_was_taken(vlc_object_t *p_this, char const *psz_cmd,
 336                               vlc_value_t oldval, vlc_value_t newval, void *p_data )
 337 {
 338     VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval); VLC_UNUSED(p_this);
 339
 340     libvlc_media_player_t *mp = p_data;
 341     libvlc_event_t event;
 342     event.type = libvlc_MediaPlayerSnapshotTaken;
 343     event.u.media_player_snapshot_taken.psz_filename = newval.psz_string;
 344     libvlc_event_send(mp->p_event_manager, &event);
 345
 346     return VLC_SUCCESS;
 347 }
 348
 349 static input_thread_t *find_input (vlc_object_t *obj)
 350 {
 351     libvlc_media_player_t *mp = (libvlc_media_player_t *)obj;
 352
 353     return libvlc_get_input_thread (mp);
 354 }
 355
 356 /* */
 357 static void libvlc_media_player_destroy( libvlc_media_player_t * );
 358
 359
 360 /**************************************************************************
 361  * Create a Media Instance object.
 362  *
 363  * Refcount strategy:
 364  * - All items created by _new start with a refcount set to 1.
 365  * - Accessor _release decrease the refcount by 1, if after that
 366  *   operation the refcount is 0, the object is destroyed.
 367  * - Accessor _retain increase the refcount by 1 (XXX: to implement)
 368  *
 369  * Object locking strategy:
 370  * - No lock held while in constructor.
 371  * - When accessing any member variable this lock is held. (XXX who locks?)
 372  * - When attempting to destroy the object the lock is also held.
 373  **************************************************************************/
 374 libvlc_media_player_t *
 375 libvlc_media_player_new( libvlc_instance_t *instance )
 376 {
 377     libvlc_media_player_t * mp;
 378
 379     assert(instance);
 380
 381     mp = vlc_object_create (instance->p_libvlc_int, sizeof(*mp));
 382     if (unlikely(mp == NULL))
 383     {
 384         libvlc_printerr("Not enough memory");
 385         return NULL;
 386     }
 387     vlc_object_attach (mp, mp->p_libvlc);
 388
 389     /* Input */
 390     var_Create (mp, "rate", VLC_VAR_FLOAT|VLC_VAR_DOINHERIT);
 391
 392     /* Video */
 393     var_Create (mp, "vout", VLC_VAR_STRING|VLC_VAR_DOINHERIT);
 394     var_Create (mp, "window", VLC_VAR_STRING);
 395     var_Create (mp, "vmem-lock", VLC_VAR_ADDRESS);
 396     var_Create (mp, "vmem-unlock", VLC_VAR_ADDRESS);
 397     var_Create (mp, "vmem-display", VLC_VAR_ADDRESS);
 398     var_Create (mp, "vmem-data", VLC_VAR_ADDRESS);
 399     var_Create (mp, "vmem-setup", VLC_VAR_ADDRESS);
 400     var_Create (mp, "vmem-cleanup", VLC_VAR_ADDRESS);
 401     var_Create (mp, "vmem-chroma", VLC_VAR_STRING | VLC_VAR_DOINHERIT);
 402     var_Create (mp, "vmem-width", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 403     var_Create (mp, "vmem-height", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 404     var_Create (mp, "vmem-pitch", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 405     var_Create (mp, "drawable-xid", VLC_VAR_INTEGER);
 406 #ifdef WIN32
 407     var_Create (mp, "drawable-hwnd", VLC_VAR_INTEGER);
 408 #endif
 409 #ifdef __APPLE__
 410     var_Create (mp, "drawable-agl", VLC_VAR_INTEGER);
 411     var_Create (mp, "drawable-nsobject", VLC_VAR_ADDRESS);
 412 #endif
 413
 414     var_Create (mp, "keyboard-events", VLC_VAR_BOOL);
 415     var_SetBool (mp, "keyboard-events", true);
 416     var_Create (mp, "mouse-events", VLC_VAR_BOOL);
 417     var_SetBool (mp, "mouse-events", true);
 418
 419     var_Create (mp, "fullscreen", VLC_VAR_BOOL);
 420     var_Create (mp, "autoscale", VLC_VAR_BOOL);
 421     var_SetBool (mp, "autoscale", true);
 422     var_Create (mp, "scale", VLC_VAR_FLOAT);
 423     var_SetFloat (mp, "scale", 1.);
 424     var_Create (mp, "aspect-ratio", VLC_VAR_STRING);
 425     var_Create (mp, "crop", VLC_VAR_STRING);
 426     var_Create (mp, "deinterlace", VLC_VAR_INTEGER);
 427     var_Create (mp, "deinterlace-mode", VLC_VAR_STRING);
 428
 429     var_Create (mp, "vbi-page", VLC_VAR_INTEGER);
 430
 431     var_Create (mp, "marq-marquee", VLC_VAR_STRING);
 432     var_Create (mp, "marq-color", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 433     var_Create (mp, "marq-opacity", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 434     var_Create (mp, "marq-position", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 435     var_Create (mp, "marq-refresh", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 436     var_Create (mp, "marq-size", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 437     var_Create (mp, "marq-timeout", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 438     var_Create (mp, "marq-x", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 439     var_Create (mp, "marq-y", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 440
 441     var_Create (mp, "logo-file", VLC_VAR_STRING);
 442     var_Create (mp, "logo-x", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 443     var_Create (mp, "logo-y", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 444     var_Create (mp, "logo-delay", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 445     var_Create (mp, "logo-repeat", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 446     var_Create (mp, "logo-opacity", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 447     var_Create (mp, "logo-position", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 448
 449     var_Create (mp, "contrast", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT);
 450     var_Create (mp, "brightness", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT);
 451     var_Create (mp, "hue", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 452     var_Create (mp, "saturation", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT);
 453     var_Create (mp, "gamma", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT);
 454
 455      /* Audio */
 456     var_Create (mp, "aout", VLC_VAR_STRING | VLC_VAR_DOINHERIT);
 457     var_Create (mp, "mute", VLC_VAR_BOOL);
 458     var_Create (mp, "volume", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
 459     var_Create (mp, "find-input-callback", VLC_VAR_ADDRESS);
 460     var_SetAddress (mp, "find-input-callback", find_input);
 461
 462     mp->p_md = NULL;
 463     mp->state = libvlc_NothingSpecial;
 464     mp->p_libvlc_instance = instance;
 465     mp->input.p_thread = NULL;
 466     mp->input.p_resource = NULL;
 467     vlc_mutex_init (&mp->input.lock);
 468     mp->i_refcount = 1;
 469     mp->p_event_manager = libvlc_event_manager_new(mp, instance);
 470     if (unlikely(mp->p_event_manager == NULL))
 471     {
 472         vlc_object_release(mp);
 473         return NULL;
 474     }
 475     vlc_mutex_init(&mp->object_lock);
 476
 477     register_event(mp, NothingSpecial);
 478     register_event(mp, Opening);
 479     register_event(mp, Buffering);
 480     register_event(mp, Playing);
 481     register_event(mp, Paused);
 482     register_event(mp, Stopped);
 483     register_event(mp, Forward);
 484     register_event(mp, Backward);
 485     register_event(mp, EndReached);
 486     register_event(mp, EncounteredError);
 487     register_event(mp, SeekableChanged);
 488
 489     register_event(mp, PositionChanged);
 490     register_event(mp, TimeChanged);
 491     register_event(mp, LengthChanged);
 492     register_event(mp, TitleChanged);
 493     register_event(mp, PausableChanged);
 494
 495     /* Snapshot initialization */
 496     register_event(mp, SnapshotTaken);
 497
 498     register_event(mp, MediaChanged);
 499
 500     /* Attach a var callback to the global object to provide the glue between
 501      * vout_thread that generates the event and media_player that re-emits it
 502      * with its own event manager
 503      *
 504      * FIXME: It's unclear why we want to put this in public API, and why we
 505      * want to expose it in such a limiting and ugly way.
 506      */
 507     var_AddCallback(mp->p_libvlc, "snapshot-file", snapshot_was_taken, mp);
 508
 509     libvlc_retain(instance);
 510     return mp;
 511 }
 512
 513 /**************************************************************************
 514  * Create a Media Instance object with a media descriptor.
 515  **************************************************************************/
 516 libvlc_media_player_t *
 517 libvlc_media_player_new_from_media( libvlc_media_t * p_md )
 518 {
 519     libvlc_media_player_t * p_mi;
 520
 521     p_mi = libvlc_media_player_new( p_md->p_libvlc_instance );
 522     if( !p_mi )
 523         return NULL;
 524
 525     libvlc_media_retain( p_md );
 526     p_mi->p_md = p_md;
 527
 528     return p_mi;
 529 }
 530
 531 /**************************************************************************
 532  * Destroy a Media Instance object (libvlc internal)
 533  *
 534  * Warning: No lock held here, but hey, this is internal. Caller must lock.
 535  **************************************************************************/
 536 static void libvlc_media_player_destroy( libvlc_media_player_t *p_mi )
 537 {
 538     assert( p_mi );
 539
 540     /* Detach Callback from the main libvlc object */
 541     var_DelCallback( p_mi->p_libvlc,
 542                      "snapshot-file", snapshot_was_taken, p_mi );
 543
 544     /* No need for lock_input() because no other threads knows us anymore */
 545     if( p_mi->input.p_thread )
 546         release_input_thread(p_mi, true);
 547     if( p_mi->input.p_resource )
 548     {
 549         input_resource_Terminate( p_mi->input.p_resource );
 550         input_resource_Release( p_mi->input.p_resource );
 551         p_mi->input.p_resource = NULL;
 552     }
 553     vlc_mutex_destroy( &p_mi->input.lock );
 554
 555     libvlc_event_manager_release( p_mi->p_event_manager );
 556     libvlc_media_release( p_mi->p_md );
 557     vlc_mutex_destroy( &p_mi->object_lock );
 558
 559     libvlc_instance_t *instance = p_mi->p_libvlc_instance;
 560     vlc_object_release( p_mi );
 561     libvlc_release(instance);
 562 }
 563
 564 /**************************************************************************
 565  * Release a Media Instance object.
 566  *
 567  * Function does the locking.
 568  **************************************************************************/
 569 void libvlc_media_player_release( libvlc_media_player_t *p_mi )
 570 {
 571     bool destroy;
 572
 573     assert( p_mi );
 574     lock(p_mi);
 575     destroy = !--p_mi->i_refcount;
 576     unlock(p_mi);
 577
 578     if( destroy )
 579         libvlc_media_player_destroy( p_mi );
 580 }
 581
 582 /**************************************************************************
 583  * Retain a Media Instance object.
 584  *
 585  * Caller must hold the lock.
 586  **************************************************************************/
 587 void libvlc_media_player_retain( libvlc_media_player_t *p_mi )
 588 {
 589     assert( p_mi );
 590
 591     lock(p_mi);
 592     p_mi->i_refcount++;
 593     unlock(p_mi);
 594 }
 595
 596 /**************************************************************************
 597  * Set the Media descriptor associated with the instance.
 598  *
 599  * Enter without lock -- function will lock the object.
 600  **************************************************************************/
 601 void libvlc_media_player_set_media(
 602                             libvlc_media_player_t *p_mi,
 603                             libvlc_media_t *p_md )
 604 {
 605     lock_input(p_mi);
 606
 607     /* FIXME I am not sure if it is a user request or on die(eof/error)
 608      * request here */
 609     release_input_thread( p_mi,
 610                           p_mi->input.p_thread &&
 611                           !p_mi->input.p_thread->b_eof &&
 612                           !p_mi->input.p_thread->b_error );
 613
 614     lock( p_mi );
 615     set_state( p_mi, libvlc_NothingSpecial, true );
 616     unlock_input( p_mi );
 617
 618     libvlc_media_release( p_mi->p_md );
 619
 620     if( !p_md )
 621     {
 622         p_mi->p_md = NULL;
 623         unlock(p_mi);
 624         return; /* It is ok to pass a NULL md */
 625     }
 626
 627     libvlc_media_retain( p_md );
 628     p_mi->p_md = p_md;
 629
 630     /* The policy here is to ignore that we were created using a different
 631      * libvlc_instance, because we don't really care */
 632     p_mi->p_libvlc_instance = p_md->p_libvlc_instance;
 633
 634     unlock(p_mi);
 635
 636     /* Send an event for the newly available media */
 637     libvlc_event_t event;
 638     event.type = libvlc_MediaPlayerMediaChanged;
 639     event.u.media_player_media_changed.new_media = p_md;
 640     libvlc_event_send( p_mi->p_event_manager, &event );
 641
 642 }
 643
 644 /**************************************************************************
 645  * Get the Media descriptor associated with the instance.
 646  **************************************************************************/
 647 libvlc_media_t *
 648 libvlc_media_player_get_media( libvlc_media_player_t *p_mi )
 649 {
 650     libvlc_media_t *p_m;
 651
 652     lock(p_mi);
 653     p_m = p_mi->p_md;
 654     if( p_m )
 655         libvlc_media_retain( p_mi->p_md );
 656     unlock(p_mi);
 657     return p_mi->p_md;
 658 }
 659
 660 /**************************************************************************
 661  * Get the event Manager.
 662  **************************************************************************/
 663 libvlc_event_manager_t *
 664 libvlc_media_player_event_manager( libvlc_media_player_t *p_mi )
 665 {
 666     return p_mi->p_event_manager;
 667 }
 668
 669 /**************************************************************************
 670  * Tell media player to start playing.
 671  **************************************************************************/
 672 int libvlc_media_player_play( libvlc_media_player_t *p_mi )
 673 {
 674     lock_input( p_mi );
 675
 676     input_thread_t *p_input_thread = p_mi->input.p_thread;
 677     if( p_input_thread )
 678     {
 679         /* A thread already exists, send it a play message */
 680         input_Control( p_input_thread, INPUT_SET_STATE, PLAYING_S );
 681         unlock_input( p_mi );
 682         return 0;
 683     }
 684
 685     /* Ignore previous exception */
 686     lock(p_mi);
 687
 688     if( !p_mi->p_md )
 689     {
 690         unlock(p_mi);
 691         unlock_input( p_mi );
 692         libvlc_printerr( "No associated media descriptor" );
 693         return -1;
 694     }
 695
 696     if( !p_mi->input.p_resource )
 697         p_mi->input.p_resource = input_resource_New( VLC_OBJECT( p_mi ) );
 698     p_input_thread = input_Create( p_mi, p_mi->p_md->p_input_item, NULL,
 699                                    p_mi->input.p_resource );
 700     unlock(p_mi);
 701     if( !p_input_thread )
 702     {
 703         unlock_input(p_mi);
 704         libvlc_printerr( "Not enough memory" );
 705         return -1;
 706     }
 707
 708     var_AddCallback( p_input_thread, "can-seek", input_seekable_changed, p_mi );
 709     var_AddCallback( p_input_thread, "can-pause", input_pausable_changed, p_mi );
 710     var_AddCallback( p_input_thread, "intf-event", input_event_changed, p_mi );
 711
 712     if( input_Start( p_input_thread ) )
 713     {
 714         unlock_input(p_mi);
 715         var_DelCallback( p_input_thread, "intf-event", input_event_changed, p_mi );
 716         var_DelCallback( p_input_thread, "can-pause", input_pausable_changed, p_mi );
 717         var_DelCallback( p_input_thread, "can-seek", input_seekable_changed, p_mi );
 718         vlc_object_release( p_input_thread );
 719         libvlc_printerr( "Input initialization failure" );
 720         return -1;
 721     }
 722     p_mi->input.p_thread = p_input_thread;
 723     unlock_input(p_mi);
 724     return 0;
 725 }
 726
 727 void libvlc_media_player_set_pause( libvlc_media_player_t *p_mi, int paused )
 728 {
 729     input_thread_t * p_input_thread = libvlc_get_input_thread( p_mi );
 730     if( !p_input_thread )
 731         return;
 732
 733     libvlc_state_t state = libvlc_media_player_get_state( p_mi );
 734     if( state == libvlc_Playing || state == libvlc_Buffering )
 735     {
 736         if( paused )
 737         {
 738             if( libvlc_media_player_can_pause( p_mi ) )
 739                 input_Control( p_input_thread, INPUT_SET_STATE, PAUSE_S );
 740             else
 741                 libvlc_media_player_stop( p_mi );
 742         }
 743     }
 744     else
 745     {
 746         if( !paused )
 747             input_Control( p_input_thread, INPUT_SET_STATE, PLAYING_S );
 748     }
 749
 750     vlc_object_release( p_input_thread );
 751 }
 752
 753 /**************************************************************************
 754  * Toggle pause.
 755  **************************************************************************/
 756 void libvlc_media_player_pause( libvlc_media_player_t *p_mi )
 757 {
 758     libvlc_state_t state = libvlc_media_player_get_state( p_mi );
 759     bool playing = (state == libvlc_Playing || state == libvlc_Buffering);
 760
 761     libvlc_media_player_set_pause( p_mi, playing );
 762 }
 763
 764 /**************************************************************************
 765  * Tells whether the media player is currently playing.
 766  *
 767  * Enter with lock held.
 768  **************************************************************************/
 769 int libvlc_media_player_is_playing( libvlc_media_player_t *p_mi )
 770 {
 771     libvlc_state_t state = libvlc_media_player_get_state( p_mi );
 772     return (libvlc_Playing == state) || (libvlc_Buffering == state);
 773 }
 774
 775 /**************************************************************************
 776  * Stop playing.
 777  **************************************************************************/
 778 void libvlc_media_player_stop( libvlc_media_player_t *p_mi )
 779 {
 780     libvlc_state_t state = libvlc_media_player_get_state( p_mi );
 781
 782     lock_input(p_mi);
 783     release_input_thread( p_mi, true ); /* This will stop the input thread */
 784
 785     /* Force to go to stopped state, in case we were in Ended, or Error
 786      * state. */
 787     if( state != libvlc_Stopped )
 788     {
 789         set_state( p_mi, libvlc_Stopped, false );
 790
 791         /* Construct and send the event */
 792         libvlc_event_t event;
 793         event.type = libvlc_MediaPlayerStopped;
 794         libvlc_event_send( p_mi->p_event_manager, &event );
 795     }
 796
 797     if( p_mi->input.p_resource != NULL )
 798         input_resource_Terminate( p_mi->input.p_resource );
 799     unlock_input(p_mi);
 800 }
 801
 802
 803 void libvlc_video_set_callbacks( libvlc_media_player_t *mp,
 804     void *(*lock_cb) (void *, void **),
 805     void (*unlock_cb) (void *, void *, void *const *),
 806     void (*display_cb) (void *, void *),
 807     void *opaque )
 808 {
 809     var_SetAddress( mp, "vmem-lock", lock_cb );
 810     var_SetAddress( mp, "vmem-unlock", unlock_cb );
 811     var_SetAddress( mp, "vmem-display", display_cb );
 812     var_SetAddress( mp, "vmem-data", opaque );
 813     var_SetString( mp, "vout", "vmem" );
 814 }
 815
 816 void libvlc_video_set_format_callbacks( libvlc_media_player_t *mp,
 817                                         libvlc_video_format_cb setup,
 818                                         libvlc_video_cleanup_cb cleanup )
 819 {
 820     var_SetAddress( mp, "vmem-setup", setup );
 821     var_SetAddress( mp, "vmem-cleanup", cleanup );
 822 }
 823
 824 void libvlc_video_set_format( libvlc_media_player_t *mp, const char *chroma,
 825                               unsigned width, unsigned height, unsigned pitch )
 826 {
 827     var_SetString( mp, "vmem-chroma", chroma );
 828     var_SetInteger( mp, "vmem-width", width );
 829     var_SetInteger( mp, "vmem-height", height );
 830     var_SetInteger( mp, "vmem-pitch", pitch );
 831 }
 832
 833 /**************************************************************************
 834  * set_nsobject
 835  **************************************************************************/
 836 void libvlc_media_player_set_nsobject( libvlc_media_player_t *p_mi,
 837                                         void * drawable )
 838 {
 839     assert (p_mi != NULL);
 840 #ifdef __APPLE__
 841     var_SetAddress (p_mi, "drawable-nsobject", drawable);
 842 #else
 843     (void) p_mi; (void)drawable;
 844 #endif
 845 }
 846
 847 /**************************************************************************
 848  * get_nsobject
 849  **************************************************************************/
 850 void * libvlc_media_player_get_nsobject( libvlc_media_player_t *p_mi )
 851 {
 852     assert (p_mi != NULL);
 853 #ifdef __APPLE__
 854     return var_GetAddress (p_mi, "drawable-nsobject");
 855 #else
 856     return NULL;
 857 #endif
 858 }
 859
 860 /**************************************************************************
 861  * set_agl
 862  **************************************************************************/
 863 void libvlc_media_player_set_agl( libvlc_media_player_t *p_mi,
 864                                   uint32_t drawable )
 865 {
 866 #ifdef __APPLE__
 867     var_SetInteger (p_mi, "drawable-agl", drawable);
 868 #else
 869     (void) p_mi; (void)drawable;
 870 #endif
 871 }
 872
 873 /**************************************************************************
 874  * get_agl
 875  **************************************************************************/
 876 uint32_t libvlc_media_player_get_agl( libvlc_media_player_t *p_mi )
 877 {
 878     assert (p_mi != NULL);
 879 #ifdef __APPLE__
 880     return var_GetInteger (p_mi, "drawable-agl");
 881 #else
 882     return 0;
 883 #endif
 884 }
 885
 886 /**************************************************************************
 887  * set_xwindow
 888  **************************************************************************/
 889 void libvlc_media_player_set_xwindow( libvlc_media_player_t *p_mi,
 890                                       uint32_t drawable )
 891 {
 892     assert (p_mi != NULL);
 893
 894     var_SetString (p_mi, "vout", drawable ? "xid" : "any");
 895     var_SetString (p_mi, "window", drawable ? "embed-xid,any" : "any");
 896     var_SetInteger (p_mi, "drawable-xid", drawable);
 897 }
 898
 899 /**************************************************************************
 900  * get_xwindow
 901  **************************************************************************/
 902 uint32_t libvlc_media_player_get_xwindow( libvlc_media_player_t *p_mi )
 903 {
 904     return var_GetInteger (p_mi, "drawable-xid");
 905 }
 906
 907 /**************************************************************************
 908  * set_hwnd
 909  **************************************************************************/
 910 void libvlc_media_player_set_hwnd( libvlc_media_player_t *p_mi,
 911                                    void *drawable )
 912 {
 913     assert (p_mi != NULL);
 914 #ifdef WIN32
 915     var_SetString (p_mi, "window",
 916                    (drawable != NULL) ? "embed-hwnd,any" : "");
 917     var_SetInteger (p_mi, "drawable-hwnd", (uintptr_t)drawable);
 918 #else
 919     (void) p_mi; (void) drawable;
 920 #endif
 921 }
 922
 923 /**************************************************************************
 924  * get_hwnd
 925  **************************************************************************/
 926 void *libvlc_media_player_get_hwnd( libvlc_media_player_t *p_mi )
 927 {
 928     assert (p_mi != NULL);
 929 #ifdef WIN32
 930     return (void *)(uintptr_t)var_GetInteger (p_mi, "drawable-hwnd");
 931 #else
 932     return NULL;
 933 #endif
 934 }
 935
 936 /**************************************************************************
 937  * Getters for stream information
 938  **************************************************************************/
 939 libvlc_time_t libvlc_media_player_get_length(
 940                              libvlc_media_player_t *p_mi )
 941 {
 942     input_thread_t *p_input_thread;
 943     libvlc_time_t i_time;
 944
 945     p_input_thread = libvlc_get_input_thread ( p_mi );
 946     if( !p_input_thread )
 947         return -1;
 948
 949     i_time = from_mtime(var_GetTime( p_input_thread, "length" ));
 950     vlc_object_release( p_input_thread );
 951
 952     return i_time;
 953 }
 954
 955 libvlc_time_t libvlc_media_player_get_time( libvlc_media_player_t *p_mi )
 956 {
 957     input_thread_t *p_input_thread;
 958     libvlc_time_t i_time;
 959
 960     p_input_thread = libvlc_get_input_thread ( p_mi );
 961     if( !p_input_thread )
 962         return -1;
 963
 964     i_time = from_mtime(var_GetTime( p_input_thread , "time" ));
 965     vlc_object_release( p_input_thread );
 966     return i_time;
 967 }
 968
 969 void libvlc_media_player_set_time( libvlc_media_player_t *p_mi,
 970                                    libvlc_time_t i_time )
 971 {
 972     input_thread_t *p_input_thread;
 973
 974     p_input_thread = libvlc_get_input_thread ( p_mi );
 975     if( !p_input_thread )
 976         return;
 977
 978     var_SetTime( p_input_thread, "time", to_mtime(i_time) );
 979     vlc_object_release( p_input_thread );
 980 }
 981
 982 void libvlc_media_player_set_position( libvlc_media_player_t *p_mi,
 983                                        float position )
 984 {
 985     input_thread_t *p_input_thread;
 986
 987     p_input_thread = libvlc_get_input_thread ( p_mi );
 988     if( !p_input_thread )
 989         return;
 990
 991     var_SetFloat( p_input_thread, "position", position );
 992     vlc_object_release( p_input_thread );
 993 }
 994
 995 float libvlc_media_player_get_position( libvlc_media_player_t *p_mi )
 996 {
 997     input_thread_t *p_input_thread;
 998     float f_position;
 999
1000     p_input_thread = libvlc_get_input_thread ( p_mi );
1001     if( !p_input_thread )
1002         return -1.0;
1003
1004     f_position = var_GetFloat( p_input_thread, "position" );
1005     vlc_object_release( p_input_thread );
1006
1007     return f_position;
1008 }
1009
1010 void libvlc_media_player_set_chapter( libvlc_media_player_t *p_mi,
1011                                       int chapter )
1012 {
1013     input_thread_t *p_input_thread;
1014
1015     p_input_thread = libvlc_get_input_thread ( p_mi );
1016     if( !p_input_thread )
1017         return;
1018
1019     var_SetInteger( p_input_thread, "chapter", chapter );
1020     vlc_object_release( p_input_thread );
1021 }
1022
1023 int libvlc_media_player_get_chapter( libvlc_media_player_t *p_mi )
1024 {
1025     input_thread_t *p_input_thread;
1026     int i_chapter;
1027
1028     p_input_thread = libvlc_get_input_thread ( p_mi );
1029     if( !p_input_thread )
1030         return -1;
1031
1032     i_chapter = var_GetInteger( p_input_thread, "chapter" );
1033     vlc_object_release( p_input_thread );
1034
1035     return i_chapter;
1036 }
1037
1038 int libvlc_media_player_get_chapter_count( libvlc_media_player_t *p_mi )
1039 {
1040     input_thread_t *p_input_thread;
1041     vlc_value_t val;
1042
1043     p_input_thread = libvlc_get_input_thread ( p_mi );
1044     if( !p_input_thread )
1045         return -1;
1046
1047     var_Change( p_input_thread, "chapter", VLC_VAR_CHOICESCOUNT, &val, NULL );
1048     vlc_object_release( p_input_thread );
1049
1050     return val.i_int;
1051 }
1052
1053 int libvlc_media_player_get_chapter_count_for_title(
1054                                  libvlc_media_player_t *p_mi,
1055                                  int i_title )
1056 {
1057     input_thread_t *p_input_thread;
1058     vlc_value_t val;
1059
1060     p_input_thread = libvlc_get_input_thread ( p_mi );
1061     if( !p_input_thread )
1062         return -1;
1063
1064     char *psz_name;
1065     if( asprintf( &psz_name,  "title %2i", i_title ) == -1 )
1066     {
1067         vlc_object_release( p_input_thread );
1068         return -1;
1069     }
1070     var_Change( p_input_thread, psz_name, VLC_VAR_CHOICESCOUNT, &val, NULL );
1071     vlc_object_release( p_input_thread );
1072     free( psz_name );
1073
1074     return val.i_int;
1075 }
1076
1077 void libvlc_media_player_set_title( libvlc_media_player_t *p_mi,
1078                                     int i_title )
1079 {
1080     input_thread_t *p_input_thread;
1081
1082     p_input_thread = libvlc_get_input_thread ( p_mi );
1083     if( !p_input_thread )
1084         return;
1085
1086     var_SetInteger( p_input_thread, "title", i_title );
1087     vlc_object_release( p_input_thread );
1088
1089     //send event
1090     libvlc_event_t event;
1091     event.type = libvlc_MediaPlayerTitleChanged;
1092     event.u.media_player_title_changed.new_title = i_title;
1093     libvlc_event_send( p_mi->p_event_manager, &event );
1094 }
1095
1096 int libvlc_media_player_get_title( libvlc_media_player_t *p_mi )
1097 {
1098     input_thread_t *p_input_thread;
1099     int i_title;
1100
1101     p_input_thread = libvlc_get_input_thread ( p_mi );
1102     if( !p_input_thread )
1103         return -1;
1104
1105     i_title = var_GetInteger( p_input_thread, "title" );
1106     vlc_object_release( p_input_thread );
1107
1108     return i_title;
1109 }
1110
1111 int libvlc_media_player_get_title_count( libvlc_media_player_t *p_mi )
1112 {
1113     input_thread_t *p_input_thread;
1114     vlc_value_t val;
1115
1116     p_input_thread = libvlc_get_input_thread ( p_mi );
1117     if( !p_input_thread )
1118         return -1;
1119
1120     var_Change( p_input_thread, "title", VLC_VAR_CHOICESCOUNT, &val, NULL );
1121     vlc_object_release( p_input_thread );
1122
1123     return val.i_int;
1124 }
1125
1126 void libvlc_media_player_next_chapter( libvlc_media_player_t *p_mi )
1127 {
1128     input_thread_t *p_input_thread;
1129
1130     p_input_thread = libvlc_get_input_thread ( p_mi );
1131     if( !p_input_thread )
1132         return;
1133
1134     int i_type = var_Type( p_input_thread, "next-chapter" );
1135     var_TriggerCallback( p_input_thread, (i_type & VLC_VAR_TYPE) != 0 ?
1136                             "next-chapter":"next-title" );
1137
1138     vlc_object_release( p_input_thread );
1139 }
1140
1141 void libvlc_media_player_previous_chapter( libvlc_media_player_t *p_mi )
1142 {
1143     input_thread_t *p_input_thread;
1144
1145     p_input_thread = libvlc_get_input_thread ( p_mi );
1146     if( !p_input_thread )
1147         return;
1148
1149     int i_type = var_Type( p_input_thread, "next-chapter" );
1150     var_TriggerCallback( p_input_thread, (i_type & VLC_VAR_TYPE) != 0 ?
1151                             "prev-chapter":"prev-title" );
1152
1153     vlc_object_release( p_input_thread );
1154 }
1155
1156 float libvlc_media_player_get_fps( libvlc_media_player_t *p_mi )
1157 {
1158     input_thread_t *p_input_thread = libvlc_get_input_thread ( p_mi );
1159     double f_fps = 0.0;
1160
1161     if( p_input_thread )
1162     {
1163         if( input_Control( p_input_thread, INPUT_GET_VIDEO_FPS, &f_fps ) )
1164             f_fps = 0.0;
1165         vlc_object_release( p_input_thread );
1166     }
1167     return f_fps;
1168 }
1169
1170 int libvlc_media_player_will_play( libvlc_media_player_t *p_mi )
1171 {
1172     bool b_will_play;
1173     input_thread_t *p_input_thread =
1174                             libvlc_get_input_thread ( p_mi );
1175     if ( !p_input_thread )
1176         return false;
1177
1178     b_will_play = !p_input_thread->b_die && !p_input_thread->b_dead;
1179     vlc_object_release( p_input_thread );
1180
1181     return b_will_play;
1182 }
1183
1184 int libvlc_media_player_set_rate( libvlc_media_player_t *p_mi, float rate )
1185 {
1186     if (rate < 0.)
1187     {
1188         libvlc_printerr ("Playing backward not supported");
1189         return -1;
1190     }
1191
1192     var_SetFloat (p_mi, "rate", rate);
1193
1194     input_thread_t *p_input_thread = libvlc_get_input_thread ( p_mi );
1195     if( !p_input_thread )
1196         return 0;
1197     var_SetFloat( p_input_thread, "rate", rate );
1198     vlc_object_release( p_input_thread );
1199     return 0;
1200 }
1201
1202 float libvlc_media_player_get_rate( libvlc_media_player_t *p_mi )
1203 {
1204     return var_GetFloat (p_mi, "rate");
1205 }
1206
1207 libvlc_state_t libvlc_media_player_get_state( libvlc_media_player_t *p_mi )
1208 {
1209     lock(p_mi);
1210     libvlc_state_t state = p_mi->state;
1211     unlock(p_mi);
1212     return state;
1213 }
1214
1215 int libvlc_media_player_is_seekable( libvlc_media_player_t *p_mi )
1216 {
1217     input_thread_t *p_input_thread;
1218     bool b_seekable;
1219
1220     p_input_thread = libvlc_get_input_thread ( p_mi );
1221     if ( !p_input_thread )
1222         return false;
1223     b_seekable = var_GetBool( p_input_thread, "can-seek" );
1224     vlc_object_release( p_input_thread );
1225
1226     return b_seekable;
1227 }
1228
1229 void libvlc_media_player_navigate( libvlc_media_player_t* p_mi,
1230                                    unsigned navigate )
1231 {
1232     input_thread_t *p_input_thread;
1233
1234     if ( navigate > libvlc_navigate_to_action_size)
1235       return;
1236
1237     p_input_thread = libvlc_get_input_thread ( p_mi );
1238     if ( !p_input_thread )
1239       return;
1240
1241     var_SetInteger( p_mi->p_libvlc_instance->p_libvlc_int,
1242                     "key-action", libvlc_navigate_to_action[navigate] );
1243
1244     vlc_object_release( p_input_thread );
1245 }
1246
1247 /* internal function, used by audio, video */
1248 libvlc_track_description_t *
1249         libvlc_get_track_description( libvlc_media_player_t *p_mi,
1250                                       const char *psz_variable )
1251 {
1252     input_thread_t *p_input = libvlc_get_input_thread( p_mi );
1253     libvlc_track_description_t *p_track_description = NULL,
1254                                *p_actual, *p_previous;
1255
1256     if( !p_input )
1257         return NULL;
1258
1259     vlc_value_t val_list, text_list;
1260     var_Change( p_input, psz_variable, VLC_VAR_GETLIST, &val_list, &text_list);
1261
1262     /* no tracks */
1263     if( val_list.p_list->i_count <= 0 )
1264         goto end;
1265
1266     p_track_description = ( libvlc_track_description_t * )
1267         malloc( sizeof( libvlc_track_description_t ) );
1268     if ( !p_track_description )
1269     {
1270         libvlc_printerr( "Not enough memory" );
1271         goto end;
1272     }
1273     p_actual = p_track_description;
1274     p_previous = NULL;
1275     for( int i = 0; i < val_list.p_list->i_count; i++ )
1276     {
1277         if( !p_actual )
1278         {
1279             p_actual = ( libvlc_track_description_t * )
1280                 malloc( sizeof( libvlc_track_description_t ) );
1281             if ( !p_actual )
1282             {
1283                 libvlc_track_description_release( p_track_description );
1284                 libvlc_printerr( "Not enough memory" );
1285                 goto end;
1286             }
1287         }
1288         p_actual->i_id = val_list.p_list->p_values[i].i_int;
1289         p_actual->psz_name = strdup( text_list.p_list->p_values[i].psz_string );
1290         p_actual->p_next = NULL;
1291         if( p_previous )
1292             p_previous->p_next = p_actual;
1293         p_previous = p_actual;
1294         p_actual =  NULL;
1295     }
1296
1297 end:
1298     var_FreeList( &val_list, &text_list );
1299     vlc_object_release( p_input );
1300
1301     return p_track_description;
1302 }
1303
1304 void libvlc_track_description_release( libvlc_track_description_t *p_td )
1305 {
1306     libvlc_track_description_t *p_actual, *p_before;
1307     p_actual = p_td;
1308
1309     while ( p_actual )
1310     {
1311         free( p_actual->psz_name );
1312         p_before = p_actual;
1313         p_actual = p_before->p_next;
1314         free( p_before );
1315     }
1316 }
1317
1318 int libvlc_media_player_can_pause( libvlc_media_player_t *p_mi )
1319 {
1320     input_thread_t *p_input_thread;
1321     bool b_can_pause;
1322
1323     p_input_thread = libvlc_get_input_thread ( p_mi );
1324     if ( !p_input_thread )
1325         return false;
1326     b_can_pause = var_GetBool( p_input_thread, "can-pause" );
1327     vlc_object_release( p_input_thread );
1328
1329     return b_can_pause;
1330 }
1331
1332 void libvlc_media_player_next_frame( libvlc_media_player_t *p_mi )
1333 {
1334     input_thread_t *p_input_thread = libvlc_get_input_thread ( p_mi );
1335     if( p_input_thread != NULL )
1336     {
1337         var_TriggerCallback( p_input_thread, "frame-next" );
1338         vlc_object_release( p_input_thread );
1339     }
1340 }