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

   1 /*****************************************************************************
   2  * media_list_player.c: libvlc new API media_list player functions
   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 <vlc/libvlc.h>
  29 #include <vlc/libvlc_media.h>
  30 #include <vlc/libvlc_media_list.h>
  31 #include <vlc/libvlc_media_player.h>
  32 #include <vlc/libvlc_media_list_player.h>
  33 #include <vlc/libvlc_events.h>
  34 #include <assert.h>
  35
  36 #include "libvlc_internal.h"
  37
  38 #include "media_internal.h" // Abuse, could and should be removed
  39 #include "media_list_path.h"
  40
  41 //#define DEBUG_MEDIA_LIST_PLAYER
  42
  43 /* This is a very dummy implementation of playlist on top of
  44  * media_list and media_player.
  45  *
  46  * All this code is doing is simply computing the next item
  47  * of a tree of media_list (see get_next_index()), and play
  48  * the next item when the current is over. This is happening
  49  * via the event callback media_player_reached_end().
  50  *
  51  * This is thread safe, and we use a two keys (locks) scheme
  52  * to discriminate between callbacks and regular uses.
  53  */
  54
  55 struct libvlc_media_list_player_t
  56 {
  57     libvlc_event_manager_t *    p_event_manager;
  58     libvlc_instance_t *         p_libvlc_instance;
  59     int                         i_refcount;
  60     /* Protect access to this structure. */
  61     vlc_mutex_t                 object_lock;
  62     /* Protect access to this structure and from callback execution. */
  63     vlc_mutex_t                 mp_callback_lock;
  64     /* Indicate to media player callbacks that they are cancelled. */
  65     bool                        are_mp_callback_cancelled;
  66     libvlc_media_list_path_t    current_playing_item_path;
  67     libvlc_media_t *            p_current_playing_item;
  68     libvlc_media_list_t *       p_mlist;
  69     libvlc_media_player_t *     p_mi;
  70     libvlc_playback_mode_t      e_playback_mode;
  71 };
  72
  73 /* This is not yet exported by libvlccore */
  74 static inline void vlc_assert_locked(vlc_mutex_t *mutex)
  75 {
  76     VLC_UNUSED(mutex);
  77 }
  78
  79 /*
  80  * Forward declaration
  81  */
  82
  83 static void set_relative_playlist_position_and_play(
  84                                             libvlc_media_list_player_t * p_mlp,
  85                                             int i_relative_position,
  86                                             libvlc_exception_t * p_e);
  87 static void stop(libvlc_media_list_player_t * p_mlp, libvlc_exception_t * p_e);
  88
  89 /*
  90  * Private functions
  91  */
  92
  93 /**************************************************************************
  94  * Shortcuts
  95  **************************************************************************/
  96 static inline void lock(libvlc_media_list_player_t * p_mlp)
  97 {
  98     // Obtain an access to this structure
  99     vlc_mutex_lock(&p_mlp->object_lock);
 100
 101     // Make sure no callback will occurs at the same time
 102     vlc_mutex_lock(&p_mlp->mp_callback_lock);
 103 }
 104
 105 static inline void unlock(libvlc_media_list_player_t * p_mlp)
 106 {
 107     vlc_mutex_unlock(&p_mlp->mp_callback_lock);
 108     vlc_mutex_unlock(&p_mlp->object_lock);
 109 }
 110
 111 static inline void assert_locked(libvlc_media_list_player_t * p_mlp)
 112 {
 113     vlc_assert_locked(&p_mlp->mp_callback_lock);
 114 }
 115
 116 static inline libvlc_event_manager_t * mlist_em(libvlc_media_list_player_t * p_mlp)
 117 {
 118     assert_locked(p_mlp);
 119     return libvlc_media_list_event_manager(p_mlp->p_mlist, NULL);
 120 }
 121
 122 static inline libvlc_event_manager_t * mplayer_em(libvlc_media_list_player_t * p_mlp)
 123 {
 124     assert_locked(p_mlp);
 125     return libvlc_media_player_event_manager(p_mlp->p_mi, NULL);
 126 }
 127
 128 /**************************************************************************
 129  *       get_next_path (private)
 130  *
 131  *  Returns the path to the next item in the list.
 132  *  If looping is specified and the current item is the last list item in
 133  *  the list it will return the first item in the list.
 134  **************************************************************************/
 135 static libvlc_media_list_path_t
 136 get_next_path(libvlc_media_list_player_t * p_mlp, bool b_loop)
 137 {
 138     assert_locked(p_mlp);
 139
 140     /* We are entered with libvlc_media_list_lock(p_mlp->p_list) */
 141     libvlc_media_list_path_t ret;
 142     libvlc_media_list_t * p_parent_of_playing_item;
 143     libvlc_media_list_t * p_sublist_of_playing_item;
 144
 145     if (!p_mlp->current_playing_item_path)
 146     {
 147         if (!libvlc_media_list_count(p_mlp->p_mlist, NULL))
 148             return NULL;
 149         return libvlc_media_list_path_with_root_index(0);
 150     }
 151
 152     p_sublist_of_playing_item = libvlc_media_list_sublist_at_path(
 153                             p_mlp->p_mlist,
 154                             p_mlp->current_playing_item_path);
 155
 156     /* If item just gained a sublist just play it */
 157     if (p_sublist_of_playing_item)
 158     {
 159         libvlc_media_list_release(p_sublist_of_playing_item);
 160         return libvlc_media_list_path_copy_by_appending(p_mlp->current_playing_item_path, 0);
 161     }
 162
 163     /* Try to catch parent element */
 164     p_parent_of_playing_item = libvlc_media_list_parentlist_at_path(p_mlp->p_mlist,
 165                             p_mlp->current_playing_item_path);
 166
 167     int depth = libvlc_media_list_path_depth(p_mlp->current_playing_item_path);
 168     if (depth < 1 || !p_parent_of_playing_item)
 169         return NULL;
 170
 171     ret = libvlc_media_list_path_copy(p_mlp->current_playing_item_path);
 172     ret[depth - 1]++; /* set to next element */
 173
 174     /* If this goes beyond the end of the list */
 175     while(ret[depth-1] >= libvlc_media_list_count(p_parent_of_playing_item, NULL))
 176     {
 177         depth--;
 178         if (depth <= 0)
 179         {
 180             if(b_loop)
 181             {
 182                 ret[0] = 0;
 183                 ret[1] = -1;
 184                 break;
 185             }
 186             else
 187             {
 188                 free(ret);
 189                 libvlc_media_list_release(p_parent_of_playing_item);
 190                 return NULL;
 191             }
 192         }
 193         ret[depth] = -1;
 194         ret[depth-1]++;
 195         p_parent_of_playing_item  = libvlc_media_list_parentlist_at_path(
 196                                         p_mlp->p_mlist,
 197                                         ret);
 198     }
 199
 200     libvlc_media_list_release(p_parent_of_playing_item);
 201     return ret;
 202 }
 203
 204 /**************************************************************************
 205  *       find_last_item (private)
 206  *
 207  *  Returns the path of the last descendant of a given item path.
 208  *  Note: Due to the recursive nature of the function and the need to free
 209  *        media list paths, paths passed in may be freed if they are replaced.
 210           Recommended usage is to set return value to the same path that was
 211           passed to the function (i.e. item = find_last_item(list, item); )
 212  **************************************************************************/
 213 static libvlc_media_list_path_t
 214 find_last_item( libvlc_media_list_t * p_mlist, libvlc_media_list_path_t current_item )
 215 {
 216     libvlc_media_list_t * p_sublist = libvlc_media_list_sublist_at_path(p_mlist, current_item);
 217     libvlc_media_list_path_t last_item_path = current_item;
 218
 219     if(p_sublist)
 220     {
 221         int i_count = libvlc_media_list_count(p_sublist, NULL);
 222         if(i_count > 0)
 223         {
 224             /* Add the last sublist item to the path. */
 225             last_item_path = libvlc_media_list_path_copy_by_appending(current_item, i_count - 1);
 226             free(current_item);
 227             /* Check that sublist item for more descendants. */
 228             last_item_path = find_last_item(p_mlist, last_item_path);
 229         }
 230
 231         libvlc_media_list_release(p_sublist);
 232     }
 233
 234     return last_item_path;
 235 }
 236
 237 /**************************************************************************
 238  *       get_previous_path (private)
 239  *
 240  *  Returns the path to the preceding item in the list.
 241  *  If looping is specified and the current item is the first list item in
 242  *  the list it will return the last descendant of the last item in the list.
 243  **************************************************************************/
 244 static libvlc_media_list_path_t
 245 get_previous_path(libvlc_media_list_player_t * p_mlp, bool b_loop)
 246 {
 247     assert_locked(p_mlp);
 248
 249     /* We are entered with libvlc_media_list_lock(p_mlp->p_list) */
 250     libvlc_media_list_path_t ret;
 251     libvlc_media_list_t * p_parent_of_playing_item;
 252
 253     if (!p_mlp->current_playing_item_path)
 254     {
 255         if (!libvlc_media_list_count(p_mlp->p_mlist, NULL))
 256             return NULL;
 257         return libvlc_media_list_path_with_root_index(0);
 258     }
 259
 260     /* Try to catch parent element */
 261     p_parent_of_playing_item = libvlc_media_list_parentlist_at_path(
 262                                             p_mlp->p_mlist,
 263                                             p_mlp->current_playing_item_path);
 264
 265     int depth = libvlc_media_list_path_depth(p_mlp->current_playing_item_path);
 266     if (depth < 1 || !p_parent_of_playing_item)
 267         return NULL;
 268
 269     /* Set the return path to the current path */
 270     ret = libvlc_media_list_path_copy(p_mlp->current_playing_item_path);
 271
 272     /* Change the return path to the previous list entry */
 273     ret[depth - 1]--; /* set to previous element */
 274     ret[depth] = -1;
 275
 276     /* Is the return path is beyond the start of the current list? */
 277     if(ret[depth - 1] < 0)
 278     {
 279         /* Move to parent of current item */
 280         depth--;
 281
 282         /* Are we at the root level of the tree? */
 283         if (depth <= 0)
 284         {
 285             // Is looping enabled?
 286             if(b_loop)
 287             {
 288                 int i_count = libvlc_media_list_count(p_parent_of_playing_item, NULL);
 289
 290                 /* Set current play item to the last element in the list */
 291                 ret[0] = i_count - 1;
 292                 ret[1] = -1;
 293
 294                 /* Set the return path to the last descendant item of the current item */
 295                 ret = find_last_item(p_mlp->p_mlist, ret);
 296             }
 297             else
 298             {
 299                 /* No looping so return empty path. */
 300                 free(ret);
 301                 ret = NULL;
 302             }
 303         }
 304         else
 305         {
 306             /* This is the case of moving backward from the beginning of the
 307             *  subitem list to its parent item.
 308             *  This ensures that current path is properly terminated to
 309             *  use that parent.
 310             */
 311             ret[depth] = -1;
 312         }
 313     }
 314     else
 315     {
 316         ret = find_last_item(p_mlp->p_mlist, ret);
 317     }
 318
 319     libvlc_media_list_release(p_parent_of_playing_item);
 320     return ret;
 321 }
 322
 323 /**************************************************************************
 324  *       media_player_reached_end (private) (Event Callback)
 325  **************************************************************************/
 326 static void
 327 media_player_reached_end(const libvlc_event_t * p_event, void * p_user_data)
 328 {
 329     VLC_UNUSED(p_event);
 330     libvlc_media_list_player_t * p_mlp = p_user_data;
 331     libvlc_exception_t e;
 332     libvlc_exception_init(&e);
 333
 334     vlc_mutex_lock(&p_mlp->mp_callback_lock);
 335     if (!p_mlp->are_mp_callback_cancelled)
 336         set_relative_playlist_position_and_play(p_mlp, 1, &e);
 337     vlc_mutex_unlock(&p_mlp->mp_callback_lock);
 338
 339     // There is no point in reporting an error from this callback
 340     libvlc_exception_clear(&e);
 341 }
 342
 343 /**************************************************************************
 344  *       playlist_item_deleted (private) (Event Callback)
 345  **************************************************************************/
 346 static void
 347 mlist_item_deleted(const libvlc_event_t * p_event, void * p_user_data)
 348 {
 349     // Nothing to do. For now.
 350 }
 351
 352
 353 /**************************************************************************
 354  * install_playlist_observer (private)
 355  **************************************************************************/
 356 static void
 357 install_playlist_observer(libvlc_media_list_player_t * p_mlp)
 358 {
 359     assert_locked(p_mlp);
 360     libvlc_event_attach(mlist_em(p_mlp), libvlc_MediaListItemDeleted, mlist_item_deleted, p_mlp, NULL);
 361 }
 362
 363 /**************************************************************************
 364  * uninstall_playlist_observer (private)
 365  **************************************************************************/
 366 static void
 367 uninstall_playlist_observer(libvlc_media_list_player_t * p_mlp)
 368 {
 369     assert_locked(p_mlp);
 370     if (!p_mlp->p_mlist) return;
 371     libvlc_event_detach(mlist_em(p_mlp), libvlc_MediaListItemDeleted, mlist_item_deleted, p_mlp, NULL);
 372 }
 373
 374 /**************************************************************************
 375  * install_media_player_observer (private)
 376  **************************************************************************/
 377 static void
 378 install_media_player_observer(libvlc_media_list_player_t * p_mlp)
 379 {
 380     assert_locked(p_mlp);
 381     libvlc_event_attach_async(mplayer_em(p_mlp), libvlc_MediaPlayerEndReached, media_player_reached_end, p_mlp, NULL);
 382 }
 383
 384
 385 /**************************************************************************
 386  *       uninstall_media_player_observer (private)
 387  **************************************************************************/
 388 static void
 389 uninstall_media_player_observer(libvlc_media_list_player_t * p_mlp)
 390 {
 391     assert_locked(p_mlp);
 392     if (!p_mlp->p_mi) return;
 393
 394     // From now on, media_player callback won't be relevant.
 395     p_mlp->are_mp_callback_cancelled = true;
 396
 397     // Allow callbacks to run, because detach() will wait until all callbacks are processed.
 398     // This is safe because only callbacks are allowed, and there execution will be cancelled.
 399     vlc_mutex_unlock(&p_mlp->mp_callback_lock);
 400     libvlc_event_detach(mplayer_em(p_mlp), libvlc_MediaPlayerEndReached, media_player_reached_end, p_mlp, NULL);
 401
 402     // Now, lock back the callback lock. No more callback will be present from this point.
 403     vlc_mutex_lock(&p_mlp->mp_callback_lock);
 404     p_mlp->are_mp_callback_cancelled = false;
 405
 406     // What is here is safe, because we guarantee that we won't be able to anything concurrently,
 407     // - except (cancelled) callbacks - thanks to the object_lock.
 408 }
 409
 410 /**************************************************************************
 411  *       set_current_playing_item (private)
 412  *
 413  * Playlist lock should be held
 414  **************************************************************************/
 415 static void
 416 set_current_playing_item(libvlc_media_list_player_t * p_mlp, libvlc_media_list_path_t path)
 417 {
 418     assert_locked(p_mlp);
 419
 420     /* First, save the new path that we are going to play */
 421     if (p_mlp->current_playing_item_path != path)
 422     {
 423         free(p_mlp->current_playing_item_path);
 424         p_mlp->current_playing_item_path = path;
 425     }
 426
 427     if (!path)
 428         return;
 429
 430     libvlc_media_t * p_md;
 431     p_md = libvlc_media_list_item_at_path(p_mlp->p_mlist, path);
 432     if (!p_md)
 433         return;
 434
 435     /* Make sure media_player_reached_end() won't get called */
 436     uninstall_media_player_observer(p_mlp);
 437
 438     /* Create a new media_player if there is none */
 439     if (!p_mlp->p_mi)
 440         p_mlp->p_mi = libvlc_media_player_new_from_media(p_md, NULL);
 441
 442     libvlc_media_player_set_media(p_mlp->p_mi, p_md, NULL);
 443
 444     install_media_player_observer(p_mlp);
 445     libvlc_media_release(p_md); /* for libvlc_media_list_item_at_index */
 446 }
 447
 448 /*
 449  * Public libvlc functions
 450  */
 451
 452 /**************************************************************************
 453  *         new (Public)
 454  **************************************************************************/
 455 libvlc_media_list_player_t *
 456 libvlc_media_list_player_new(libvlc_instance_t * p_instance, libvlc_exception_t * p_e)
 457 {
 458     (void)p_e;
 459     libvlc_media_list_player_t * p_mlp;
 460     p_mlp = calloc( 1, sizeof(libvlc_media_list_player_t) );
 461     if (!p_mlp)
 462         return NULL;
 463
 464     libvlc_retain(p_instance);
 465     p_mlp->p_libvlc_instance = p_instance;
 466     p_mlp->i_refcount = 1;
 467     vlc_mutex_init(&p_mlp->object_lock);
 468     vlc_mutex_init(&p_mlp->mp_callback_lock);
 469     p_mlp->p_event_manager = libvlc_event_manager_new(p_mlp, p_instance, p_e);
 470     libvlc_event_manager_register_event_type(p_mlp->p_event_manager, libvlc_MediaListPlayerNextItemSet, p_e);
 471     p_mlp->e_playback_mode = libvlc_playback_mode_default;
 472
 473     return p_mlp;
 474 }
 475
 476 /**************************************************************************
 477  *         release (Public)
 478  **************************************************************************/
 479 void libvlc_media_list_player_release(libvlc_media_list_player_t * p_mlp)
 480 {
 481     if (!p_mlp)
 482         return;
 483
 484     lock(p_mlp);
 485     p_mlp->i_refcount--;
 486     if (p_mlp->i_refcount > 0)
 487     {
 488         unlock(p_mlp);
 489         return;
 490     }
 491
 492     assert(p_mlp->i_refcount == 0);
 493
 494     /* Keep the lock(), because the uninstall functions
 495      * check for it. That's convenient. */
 496
 497     if (p_mlp->p_mi)
 498     {
 499         uninstall_media_player_observer(p_mlp);
 500         libvlc_media_player_release(p_mlp->p_mi);
 501     }
 502     if (p_mlp->p_mlist)
 503     {
 504         uninstall_playlist_observer(p_mlp);
 505         libvlc_media_list_release(p_mlp->p_mlist);
 506     }
 507
 508     unlock(p_mlp);
 509     vlc_mutex_destroy(&p_mlp->object_lock);
 510     vlc_mutex_destroy(&p_mlp->mp_callback_lock);
 511
 512     libvlc_event_manager_release(p_mlp->p_event_manager);
 513
 514     free(p_mlp->current_playing_item_path);
 515     libvlc_release(p_mlp->p_libvlc_instance);
 516     free(p_mlp);
 517 }
 518
 519 /**************************************************************************
 520  *        event_manager (Public)
 521  **************************************************************************/
 522 libvlc_event_manager_t *
 523 libvlc_media_list_player_event_manager(libvlc_media_list_player_t * p_mlp)
 524 {
 525     return p_mlp->p_event_manager;
 526 }
 527
 528 /**************************************************************************
 529  *        set_media_player (Public)
 530  **************************************************************************/
 531 void libvlc_media_list_player_set_media_player(libvlc_media_list_player_t * p_mlp, libvlc_media_player_t * p_mi, libvlc_exception_t * p_e)
 532 {
 533     VLC_UNUSED(p_e);
 534
 535     lock(p_mlp);
 536
 537     if (p_mlp->p_mi)
 538     {
 539         uninstall_media_player_observer(p_mlp);
 540         libvlc_media_player_release(p_mlp->p_mi);
 541     }
 542     libvlc_media_player_retain(p_mi);
 543     p_mlp->p_mi = p_mi;
 544
 545     install_media_player_observer(p_mlp);
 546
 547     unlock(p_mlp);
 548 }
 549
 550 /**************************************************************************
 551  *       set_media_list (Public)
 552  **************************************************************************/
 553 void libvlc_media_list_player_set_media_list(libvlc_media_list_player_t * p_mlp, libvlc_media_list_t * p_mlist, libvlc_exception_t * p_e)
 554 {
 555     VLC_UNUSED( p_e );
 556     assert (p_mlist);
 557
 558     lock(p_mlp);
 559     if (p_mlp->p_mlist)
 560     {
 561         uninstall_playlist_observer(p_mlp);
 562         libvlc_media_list_release(p_mlp->p_mlist);
 563     }
 564     libvlc_media_list_retain(p_mlist);
 565     p_mlp->p_mlist = p_mlist;
 566
 567     install_playlist_observer(p_mlp);
 568
 569     unlock(p_mlp);
 570 }
 571
 572 /**************************************************************************
 573  *        Play (Public)
 574  **************************************************************************/
 575 void libvlc_media_list_player_play(libvlc_media_list_player_t * p_mlp, libvlc_exception_t * p_e)
 576 {
 577     lock(p_mlp);
 578     if (!p_mlp->current_playing_item_path)
 579     {
 580         set_relative_playlist_position_and_play(p_mlp, 1, p_e);
 581         unlock(p_mlp);
 582         return; /* Will set to play */
 583     }
 584     libvlc_media_player_play(p_mlp->p_mi, p_e);
 585     unlock(p_mlp);
 586 }
 587
 588
 589 /**************************************************************************
 590  *        Pause (Public)
 591  **************************************************************************/
 592 void libvlc_media_list_player_pause(libvlc_media_list_player_t * p_mlp, libvlc_exception_t * p_e)
 593 {
 594     lock(p_mlp);
 595     if (!p_mlp->p_mi)
 596     {
 597         unlock(p_mlp);
 598         return;
 599     }
 600     libvlc_media_player_pause(p_mlp->p_mi, p_e);
 601     unlock(p_mlp);
 602 }
 603
 604 /**************************************************************************
 605  *        is_playing (Public)
 606  **************************************************************************/
 607 int
 608 libvlc_media_list_player_is_playing(libvlc_media_list_player_t * p_mlp, libvlc_exception_t * p_e)
 609 {
 610     libvlc_state_t state = libvlc_media_player_get_state(p_mlp->p_mi, p_e);
 611     return (state == libvlc_Opening) || (state == libvlc_Buffering) ||
 612            (state == libvlc_Playing);
 613 }
 614
 615 /**************************************************************************
 616  *        State (Public)
 617  **************************************************************************/
 618 libvlc_state_t
 619 libvlc_media_list_player_get_state(libvlc_media_list_player_t * p_mlp, libvlc_exception_t * p_e)
 620 {
 621     if (!p_mlp->p_mi)
 622         return libvlc_Ended;
 623     return libvlc_media_player_get_state(p_mlp->p_mi, p_e);
 624 }
 625
 626 /**************************************************************************
 627  *        Play item at index (Public)
 628  **************************************************************************/
 629 void libvlc_media_list_player_play_item_at_index(libvlc_media_list_player_t * p_mlp, int i_index, libvlc_exception_t * p_e)
 630 {
 631     VLC_UNUSED(p_e);
 632
 633     lock(p_mlp);
 634     set_current_playing_item(p_mlp, libvlc_media_list_path_with_root_index(i_index));
 635     libvlc_media_player_play(p_mlp->p_mi, p_e);
 636     unlock(p_mlp);
 637
 638     /* Send the next item event */
 639     libvlc_event_t event;
 640     event.type = libvlc_MediaListPlayerNextItemSet;
 641     libvlc_event_send(p_mlp->p_event_manager, &event);
 642 }
 643
 644 /**************************************************************************
 645  *        Play item (Public)
 646  **************************************************************************/
 647 void libvlc_media_list_player_play_item(libvlc_media_list_player_t * p_mlp, libvlc_media_t * p_md, libvlc_exception_t * p_e)
 648 {
 649     lock(p_mlp);
 650     libvlc_media_list_path_t path = libvlc_media_list_path_of_item(p_mlp->p_mlist, p_md);
 651     if (!path)
 652     {
 653         libvlc_exception_raise(p_e);
 654         libvlc_printerr("Item not found in media list");
 655         unlock(p_mlp);
 656         return;
 657     }
 658
 659     set_current_playing_item(p_mlp, path);
 660     libvlc_media_player_play(p_mlp->p_mi, p_e);
 661     unlock(p_mlp);
 662 }
 663
 664 /**************************************************************************
 665  *       Stop (Private)
 666  *
 667  * Lock must be held.
 668  **************************************************************************/
 669 static void stop(libvlc_media_list_player_t * p_mlp, libvlc_exception_t * p_e)
 670 {
 671     assert_locked(p_mlp);
 672
 673     if (p_mlp->p_mi)
 674     {
 675         /* We are not interested in getting media stop event now */
 676         uninstall_media_player_observer(p_mlp);
 677         libvlc_media_player_stop(p_mlp->p_mi, p_e);
 678         install_media_player_observer(p_mlp);
 679     }
 680
 681     free(p_mlp->current_playing_item_path);
 682     p_mlp->current_playing_item_path = NULL;
 683 }
 684
 685 /**************************************************************************
 686  *       Stop (Public)
 687  **************************************************************************/
 688 void libvlc_media_list_player_stop(libvlc_media_list_player_t * p_mlp,
 689                                    libvlc_exception_t * p_e)
 690 {
 691     lock(p_mlp);
 692     stop(p_mlp, p_e);
 693     unlock(p_mlp);
 694 }
 695
 696 /**************************************************************************
 697  *       Set relative playlist position and play (Private)
 698  *
 699  * Sets the currently played item to the given relative play item position
 700  * (based on the currently playing item) and then begins the new item playback.
 701  * Lock must be held.
 702  **************************************************************************/
 703 static void set_relative_playlist_position_and_play(
 704                                       libvlc_media_list_player_t * p_mlp,
 705                                       int i_relative_position,
 706                                       libvlc_exception_t * p_e)
 707 {
 708     assert_locked(p_mlp);
 709
 710     if (!p_mlp->p_mlist)
 711     {
 712         libvlc_exception_raise(p_e);
 713         libvlc_printerr("No media list");
 714         return;
 715     }
 716
 717     libvlc_media_list_lock(p_mlp->p_mlist);
 718
 719     libvlc_media_list_path_t path = p_mlp->current_playing_item_path;
 720
 721     if(p_mlp->e_playback_mode != libvlc_playback_mode_repeat)
 722     {
 723         bool b_loop = (p_mlp->e_playback_mode == libvlc_playback_mode_loop);
 724
 725         if(i_relative_position > 0)
 726         {
 727             do
 728             {
 729                 path = get_next_path(p_mlp, b_loop);
 730                 set_current_playing_item(p_mlp, path);
 731                 --i_relative_position;
 732             }
 733             while(i_relative_position > 0);
 734         }
 735         else if(i_relative_position < 0)
 736         {
 737             do
 738             {
 739                 path = get_previous_path(p_mlp, b_loop);
 740                 set_current_playing_item(p_mlp, path);
 741                 ++i_relative_position;
 742             }
 743             while (i_relative_position < 0);
 744         }
 745     }
 746     else
 747     {
 748         set_current_playing_item(p_mlp, path);
 749     }
 750
 751 #ifdef DEBUG_MEDIA_LIST_PLAYER
 752     printf("Playing:");
 753     libvlc_media_list_path_dump(path);
 754 #endif
 755
 756     if (!path)
 757     {
 758         libvlc_media_list_unlock(p_mlp->p_mlist);
 759         return;
 760     }
 761
 762     libvlc_media_player_play(p_mlp->p_mi, p_e);
 763
 764     libvlc_media_list_unlock(p_mlp->p_mlist);
 765
 766     /* Send the next item event */
 767     libvlc_event_t event;
 768     event.type = libvlc_MediaListPlayerNextItemSet;
 769     libvlc_media_t * p_md = libvlc_media_list_item_at_path(p_mlp->p_mlist, path);
 770     event.u.media_list_player_next_item_set.item = p_md;
 771     libvlc_event_send(p_mlp->p_event_manager, &event);
 772     libvlc_media_release(p_md);
 773 }
 774
 775 /**************************************************************************
 776  *       Next (Public)
 777  **************************************************************************/
 778 void libvlc_media_list_player_next(libvlc_media_list_player_t * p_mlp,
 779                                    libvlc_exception_t * p_e)
 780 {
 781     lock(p_mlp);
 782     set_relative_playlist_position_and_play(p_mlp, 1, p_e);
 783     unlock(p_mlp);
 784 }
 785
 786 /**************************************************************************
 787  *       Previous (Public)
 788  **************************************************************************/
 789 void libvlc_media_list_player_previous(libvlc_media_list_player_t * p_mlp,
 790                                        libvlc_exception_t * p_e)
 791 {
 792     lock(p_mlp);
 793     set_relative_playlist_position_and_play(p_mlp, -1, p_e);
 794     unlock(p_mlp);
 795 }
 796
 797 /**************************************************************************
 798  *       Set Playback Mode (Public)
 799  **************************************************************************/
 800 void libvlc_media_list_player_set_playback_mode(
 801                                             libvlc_media_list_player_t * p_mlp,
 802                                             libvlc_playback_mode_t e_mode,
 803                                             libvlc_exception_t * p_e )
 804 {
 805     VLC_UNUSED(p_e);
 806
 807     lock(p_mlp);
 808     p_mlp->e_playback_mode = e_mode;
 809     unlock(p_mlp);
 810 }