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);
  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);
 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     (void)p_event; (void)p_user_data;
 351 }
 352
 353
 354 /**************************************************************************
 355  * install_playlist_observer (private)
 356  **************************************************************************/
 357 static void
 358 install_playlist_observer(libvlc_media_list_player_t * p_mlp)
 359 {
 360     assert_locked(p_mlp);
 361     libvlc_event_attach(mlist_em(p_mlp), libvlc_MediaListItemDeleted, mlist_item_deleted, p_mlp, NULL);
 362 }
 363
 364 /**************************************************************************
 365  * uninstall_playlist_observer (private)
 366  **************************************************************************/
 367 static void
 368 uninstall_playlist_observer(libvlc_media_list_player_t * p_mlp)
 369 {
 370     assert_locked(p_mlp);
 371     if (!p_mlp->p_mlist) return;
 372     libvlc_event_detach(mlist_em(p_mlp), libvlc_MediaListItemDeleted, mlist_item_deleted, p_mlp, NULL);
 373 }
 374
 375 /**************************************************************************
 376  * install_media_player_observer (private)
 377  **************************************************************************/
 378 static void
 379 install_media_player_observer(libvlc_media_list_player_t * p_mlp)
 380 {
 381     assert_locked(p_mlp);
 382     libvlc_event_attach_async(mplayer_em(p_mlp), libvlc_MediaPlayerEndReached, media_player_reached_end, p_mlp, NULL);
 383 }
 384
 385
 386 /**************************************************************************
 387  *       uninstall_media_player_observer (private)
 388  **************************************************************************/
 389 static void
 390 uninstall_media_player_observer(libvlc_media_list_player_t * p_mlp)
 391 {
 392     assert_locked(p_mlp);
 393     if (!p_mlp->p_mi) return;
 394
 395     // From now on, media_player callback won't be relevant.
 396     p_mlp->are_mp_callback_cancelled = true;
 397
 398     // Allow callbacks to run, because detach() will wait until all callbacks are processed.
 399     // This is safe because only callbacks are allowed, and there execution will be cancelled.
 400     vlc_mutex_unlock(&p_mlp->mp_callback_lock);
 401     libvlc_event_detach(mplayer_em(p_mlp), libvlc_MediaPlayerEndReached, media_player_reached_end, p_mlp, NULL);
 402
 403     // Now, lock back the callback lock. No more callback will be present from this point.
 404     vlc_mutex_lock(&p_mlp->mp_callback_lock);
 405     p_mlp->are_mp_callback_cancelled = false;
 406
 407     // What is here is safe, because we guarantee that we won't be able to anything concurrently,
 408     // - except (cancelled) callbacks - thanks to the object_lock.
 409 }
 410
 411 /**************************************************************************
 412  *       set_current_playing_item (private)
 413  *
 414  * Playlist lock should be held
 415  **************************************************************************/
 416 static void
 417 set_current_playing_item(libvlc_media_list_player_t * p_mlp, libvlc_media_list_path_t path)
 418 {
 419     assert_locked(p_mlp);
 420
 421     /* First, save the new path that we are going to play */
 422     if (p_mlp->current_playing_item_path != path)
 423     {
 424         free(p_mlp->current_playing_item_path);
 425         p_mlp->current_playing_item_path = path;
 426     }
 427
 428     if (!path)
 429         return;
 430
 431     libvlc_media_t * p_md;
 432     p_md = libvlc_media_list_item_at_path(p_mlp->p_mlist, path);
 433     if (!p_md)
 434         return;
 435
 436     /* Make sure media_player_reached_end() won't get called */
 437     uninstall_media_player_observer(p_mlp);
 438
 439     /* Create a new media_player if there is none */
 440     if (!p_mlp->p_mi)
 441         p_mlp->p_mi = libvlc_media_player_new_from_media(p_md, NULL);
 442
 443     libvlc_media_player_set_media(p_mlp->p_mi, p_md);
 444
 445     install_media_player_observer(p_mlp);
 446     libvlc_media_release(p_md); /* for libvlc_media_list_item_at_index */
 447 }
 448
 449 /*
 450  * Public libvlc functions
 451  */
 452
 453 /**************************************************************************
 454  *         new (Public)
 455  **************************************************************************/
 456 libvlc_media_list_player_t *
 457 libvlc_media_list_player_new(libvlc_instance_t * p_instance, libvlc_exception_t * p_e)
 458 {
 459     (void)p_e;
 460     libvlc_media_list_player_t * p_mlp;
 461     p_mlp = calloc( 1, sizeof(libvlc_media_list_player_t) );
 462     if (!p_mlp)
 463         return NULL;
 464
 465     libvlc_retain(p_instance);
 466     p_mlp->p_libvlc_instance = p_instance;
 467     p_mlp->i_refcount = 1;
 468     vlc_mutex_init(&p_mlp->object_lock);
 469     vlc_mutex_init(&p_mlp->mp_callback_lock);
 470     p_mlp->p_event_manager = libvlc_event_manager_new(p_mlp, p_instance, p_e);
 471     libvlc_event_manager_register_event_type(p_mlp->p_event_manager, libvlc_MediaListPlayerNextItemSet, p_e);
 472     p_mlp->e_playback_mode = libvlc_playback_mode_default;
 473
 474     return p_mlp;
 475 }
 476
 477 /**************************************************************************
 478  *         release (Public)
 479  **************************************************************************/
 480 void libvlc_media_list_player_release(libvlc_media_list_player_t * p_mlp)
 481 {
 482     if (!p_mlp)
 483         return;
 484
 485     lock(p_mlp);
 486     p_mlp->i_refcount--;
 487     if (p_mlp->i_refcount > 0)
 488     {
 489         unlock(p_mlp);
 490         return;
 491     }
 492
 493     assert(p_mlp->i_refcount == 0);
 494
 495     /* Keep the lock(), because the uninstall functions
 496      * check for it. That's convenient. */
 497
 498     if (p_mlp->p_mi)
 499     {
 500         uninstall_media_player_observer(p_mlp);
 501         libvlc_media_player_release(p_mlp->p_mi);
 502     }
 503     if (p_mlp->p_mlist)
 504     {
 505         uninstall_playlist_observer(p_mlp);
 506         libvlc_media_list_release(p_mlp->p_mlist);
 507     }
 508
 509     unlock(p_mlp);
 510     vlc_mutex_destroy(&p_mlp->object_lock);
 511     vlc_mutex_destroy(&p_mlp->mp_callback_lock);
 512
 513     libvlc_event_manager_release(p_mlp->p_event_manager);
 514
 515     free(p_mlp->current_playing_item_path);
 516     libvlc_release(p_mlp->p_libvlc_instance);
 517     free(p_mlp);
 518 }
 519
 520 /**************************************************************************
 521  *        event_manager (Public)
 522  **************************************************************************/
 523 libvlc_event_manager_t *
 524 libvlc_media_list_player_event_manager(libvlc_media_list_player_t * p_mlp)
 525 {
 526     return p_mlp->p_event_manager;
 527 }
 528
 529 /**************************************************************************
 530  *        set_media_player (Public)
 531  **************************************************************************/
 532 void libvlc_media_list_player_set_media_player(libvlc_media_list_player_t * p_mlp, libvlc_media_player_t * p_mi)
 533 {
 534     lock(p_mlp);
 535
 536     if (p_mlp->p_mi)
 537     {
 538         uninstall_media_player_observer(p_mlp);
 539         libvlc_media_player_release(p_mlp->p_mi);
 540     }
 541     libvlc_media_player_retain(p_mi);
 542     p_mlp->p_mi = p_mi;
 543
 544     install_media_player_observer(p_mlp);
 545
 546     unlock(p_mlp);
 547 }
 548
 549 /**************************************************************************
 550  *       set_media_list (Public)
 551  **************************************************************************/
 552 void libvlc_media_list_player_set_media_list(libvlc_media_list_player_t * p_mlp, libvlc_media_list_t * p_mlist)
 553 {
 554     assert (p_mlist);
 555
 556     lock(p_mlp);
 557     if (p_mlp->p_mlist)
 558     {
 559         uninstall_playlist_observer(p_mlp);
 560         libvlc_media_list_release(p_mlp->p_mlist);
 561     }
 562     libvlc_media_list_retain(p_mlist);
 563     p_mlp->p_mlist = p_mlist;
 564
 565     install_playlist_observer(p_mlp);
 566
 567     unlock(p_mlp);
 568 }
 569
 570 /**************************************************************************
 571  *        Play (Public)
 572  **************************************************************************/
 573 void libvlc_media_list_player_play(libvlc_media_list_player_t * p_mlp, libvlc_exception_t * p_e)
 574 {
 575     lock(p_mlp);
 576     if (!p_mlp->current_playing_item_path)
 577     {
 578         set_relative_playlist_position_and_play(p_mlp, 1, p_e);
 579         unlock(p_mlp);
 580         return; /* Will set to play */
 581     }
 582     libvlc_media_player_play(p_mlp->p_mi, p_e);
 583     unlock(p_mlp);
 584 }
 585
 586
 587 /**************************************************************************
 588  *        Pause (Public)
 589  **************************************************************************/
 590 void libvlc_media_list_player_pause(libvlc_media_list_player_t * p_mlp, libvlc_exception_t * p_e)
 591 {
 592     lock(p_mlp);
 593     if (!p_mlp->p_mi)
 594     {
 595         unlock(p_mlp);
 596         return;
 597     }
 598     libvlc_media_player_pause(p_mlp->p_mi, p_e);
 599     unlock(p_mlp);
 600 }
 601
 602 /**************************************************************************
 603  *        is_playing (Public)
 604  **************************************************************************/
 605 int
 606 libvlc_media_list_player_is_playing(libvlc_media_list_player_t * p_mlp)
 607 {
 608     libvlc_state_t state = libvlc_media_player_get_state(p_mlp->p_mi);
 609     return (state == libvlc_Opening) || (state == libvlc_Buffering) ||
 610            (state == libvlc_Playing);
 611 }
 612
 613 /**************************************************************************
 614  *        State (Public)
 615  **************************************************************************/
 616 libvlc_state_t
 617 libvlc_media_list_player_get_state(libvlc_media_list_player_t * p_mlp)
 618 {
 619     if (!p_mlp->p_mi)
 620         return libvlc_Ended;
 621     return libvlc_media_player_get_state(p_mlp->p_mi);
 622 }
 623
 624 /**************************************************************************
 625  *        Play item at index (Public)
 626  **************************************************************************/
 627 void libvlc_media_list_player_play_item_at_index(libvlc_media_list_player_t * p_mlp, int i_index, libvlc_exception_t *p_e)
 628 {
 629     lock(p_mlp);
 630     set_current_playing_item(p_mlp, libvlc_media_list_path_with_root_index(i_index));
 631     libvlc_media_player_play(p_mlp->p_mi, p_e);
 632     unlock(p_mlp);
 633
 634     /* Send the next item event */
 635     libvlc_event_t event;
 636     event.type = libvlc_MediaListPlayerNextItemSet;
 637     libvlc_event_send(p_mlp->p_event_manager, &event);
 638 }
 639
 640 /**************************************************************************
 641  *        Play item (Public)
 642  **************************************************************************/
 643 void libvlc_media_list_player_play_item(libvlc_media_list_player_t * p_mlp, libvlc_media_t * p_md, libvlc_exception_t * p_e)
 644 {
 645     lock(p_mlp);
 646     libvlc_media_list_path_t path = libvlc_media_list_path_of_item(p_mlp->p_mlist, p_md);
 647     if (!path)
 648     {
 649         libvlc_exception_raise(p_e);
 650         libvlc_printerr("Item not found in media list");
 651         unlock(p_mlp);
 652         return;
 653     }
 654
 655     set_current_playing_item(p_mlp, path);
 656     libvlc_media_player_play(p_mlp->p_mi, p_e);
 657     unlock(p_mlp);
 658 }
 659
 660 /**************************************************************************
 661  *       Stop (Private)
 662  *
 663  * Lock must be held.
 664  **************************************************************************/
 665 static void stop(libvlc_media_list_player_t * p_mlp)
 666 {
 667     assert_locked(p_mlp);
 668
 669     if (p_mlp->p_mi)
 670     {
 671         /* We are not interested in getting media stop event now */
 672         uninstall_media_player_observer(p_mlp);
 673         libvlc_media_player_stop(p_mlp->p_mi);
 674         install_media_player_observer(p_mlp);
 675     }
 676
 677     free(p_mlp->current_playing_item_path);
 678     p_mlp->current_playing_item_path = NULL;
 679 }
 680
 681 /**************************************************************************
 682  *       Stop (Public)
 683  **************************************************************************/
 684 void libvlc_media_list_player_stop(libvlc_media_list_player_t * p_mlp)
 685 {
 686     lock(p_mlp);
 687     stop(p_mlp);
 688     unlock(p_mlp);
 689 }
 690
 691 /**************************************************************************
 692  *       Set relative playlist position and play (Private)
 693  *
 694  * Sets the currently played item to the given relative play item position
 695  * (based on the currently playing item) and then begins the new item playback.
 696  * Lock must be held.
 697  **************************************************************************/
 698 static void set_relative_playlist_position_and_play(
 699                                       libvlc_media_list_player_t * p_mlp,
 700                                       int i_relative_position,
 701                                       libvlc_exception_t * p_e)
 702 {
 703     assert_locked(p_mlp);
 704
 705     if (!p_mlp->p_mlist)
 706     {
 707         libvlc_exception_raise(p_e);
 708         libvlc_printerr("No media list");
 709         return;
 710     }
 711
 712     libvlc_media_list_lock(p_mlp->p_mlist);
 713
 714     libvlc_media_list_path_t path = p_mlp->current_playing_item_path;
 715
 716     if(p_mlp->e_playback_mode != libvlc_playback_mode_repeat)
 717     {
 718         bool b_loop = (p_mlp->e_playback_mode == libvlc_playback_mode_loop);
 719
 720         if(i_relative_position > 0)
 721         {
 722             do
 723             {
 724                 path = get_next_path(p_mlp, b_loop);
 725                 set_current_playing_item(p_mlp, path);
 726                 --i_relative_position;
 727             }
 728             while(i_relative_position > 0);
 729         }
 730         else if(i_relative_position < 0)
 731         {
 732             do
 733             {
 734                 path = get_previous_path(p_mlp, b_loop);
 735                 set_current_playing_item(p_mlp, path);
 736                 ++i_relative_position;
 737             }
 738             while (i_relative_position < 0);
 739         }
 740     }
 741     else
 742     {
 743         set_current_playing_item(p_mlp, path);
 744     }
 745
 746 #ifdef DEBUG_MEDIA_LIST_PLAYER
 747     printf("Playing:");
 748     libvlc_media_list_path_dump(path);
 749 #endif
 750
 751     if (!path)
 752     {
 753         libvlc_media_list_unlock(p_mlp->p_mlist);
 754         return;
 755     }
 756
 757     libvlc_media_player_play(p_mlp->p_mi, p_e);
 758
 759     libvlc_media_list_unlock(p_mlp->p_mlist);
 760
 761     /* Send the next item event */
 762     libvlc_event_t event;
 763     event.type = libvlc_MediaListPlayerNextItemSet;
 764     libvlc_media_t * p_md = libvlc_media_list_item_at_path(p_mlp->p_mlist, path);
 765     event.u.media_list_player_next_item_set.item = p_md;
 766     libvlc_event_send(p_mlp->p_event_manager, &event);
 767     libvlc_media_release(p_md);
 768 }
 769
 770 /**************************************************************************
 771  *       Next (Public)
 772  **************************************************************************/
 773 void libvlc_media_list_player_next(libvlc_media_list_player_t * p_mlp,
 774                                    libvlc_exception_t * p_e)
 775 {
 776     lock(p_mlp);
 777     set_relative_playlist_position_and_play(p_mlp, 1, p_e);
 778     unlock(p_mlp);
 779 }
 780
 781 /**************************************************************************
 782  *       Previous (Public)
 783  **************************************************************************/
 784 void libvlc_media_list_player_previous(libvlc_media_list_player_t * p_mlp,
 785                                        libvlc_exception_t * p_e)
 786 {
 787     lock(p_mlp);
 788     set_relative_playlist_position_and_play(p_mlp, -1, p_e);
 789     unlock(p_mlp);
 790 }
 791
 792 /**************************************************************************
 793  *       Set Playback Mode (Public)
 794  **************************************************************************/
 795 void libvlc_media_list_player_set_playback_mode(
 796                                             libvlc_media_list_player_t * p_mlp,
 797                                             libvlc_playback_mode_t e_mode )
 798 {
 799     lock(p_mlp);
 800     p_mlp->e_playback_mode = e_mode;
 801     unlock(p_mlp);
 802 }