lib/media_list.c

   1 /*****************************************************************************
   2  * media_list.c: libvlc new API media list functions
   3  *****************************************************************************
   4  * Copyright (C) 2007 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Pierre d'Herbemont <pdherbemont # videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27
  28 #include <assert.h>
  29
  30 #include <vlc/libvlc.h>
  31 #include <vlc/libvlc_media.h>
  32 #include <vlc/libvlc_media_list.h>
  33 #include <vlc/libvlc_events.h>
  34
  35 #include <vlc_common.h>
  36 #include <vlc_input.h>
  37
  38 #include "libvlc_internal.h"
  39 #include "media_internal.h" // libvlc_media_new_from_input_item()
  40 #include "media_list_internal.h"
  41
  42 typedef enum EventPlaceInTime {
  43     EventWillHappen,
  44     EventDidHappen
  45 } EventPlaceInTime;
  46
  47 /*
  48  * Private functions
  49  */
  50
  51
  52
  53 /**************************************************************************
  54  *       notify_item_addition (private)
  55  *
  56  * Do the appropriate action when an item is deleted.
  57  **************************************************************************/
  58 static void
  59 notify_item_addition( libvlc_media_list_t * p_mlist,
  60                       libvlc_media_t * p_md,
  61                       int index,
  62                       EventPlaceInTime event_status )
  63 {
  64     libvlc_event_t event;
  65
  66     /* Construct the event */
  67     if( event_status == EventDidHappen )
  68     {
  69         event.type = libvlc_MediaListItemAdded;
  70         event.u.media_list_item_added.item = p_md;
  71         event.u.media_list_item_added.index = index;
  72     }
  73     else /* if( event_status == EventWillHappen ) */
  74     {
  75         event.type = libvlc_MediaListWillAddItem;
  76         event.u.media_list_will_add_item.item = p_md;
  77         event.u.media_list_will_add_item.index = index;
  78     }
  79
  80     /* Send the event */
  81     libvlc_event_send( &p_mlist->event_manager, &event );
  82 }
  83
  84 /**************************************************************************
  85  *       notify_item_deletion (private)
  86  *
  87  * Do the appropriate action when an item is added.
  88  **************************************************************************/
  89 static void
  90 notify_item_deletion( libvlc_media_list_t * p_mlist,
  91                       libvlc_media_t * p_md,
  92                       int index,
  93                       EventPlaceInTime event_status )
  94 {
  95     libvlc_event_t event;
  96
  97     /* Construct the event */
  98     if( event_status == EventDidHappen )
  99     {
 100         event.type = libvlc_MediaListItemDeleted;
 101         event.u.media_list_item_deleted.item = p_md;
 102         event.u.media_list_item_deleted.index = index;
 103     }
 104     else /* if( event_status == EventWillHappen ) */
 105     {
 106         event.type = libvlc_MediaListWillDeleteItem;
 107         event.u.media_list_will_delete_item.item = p_md;
 108         event.u.media_list_will_delete_item.index = index;
 109     }
 110
 111     /* Send the event */
 112     libvlc_event_send( &p_mlist->event_manager, &event );
 113 }
 114
 115 /* LibVLC internal */
 116 void libvlc_media_list_internal_end_reached( libvlc_media_list_t * p_mlist )
 117 {
 118     libvlc_event_t event;
 119
 120     event.type = libvlc_MediaListEndReached;
 121
 122     /* Send the event */
 123     libvlc_event_send( &p_mlist->event_manager, &event );
 124 }
 125
 126 /**************************************************************************
 127  *       static mlist_is_writable (private)
 128  **************************************************************************/
 129 static inline
 130 bool mlist_is_writable( libvlc_media_list_t *p_mlist )
 131 {
 132     if( !p_mlist||p_mlist->b_read_only )
 133     {
 134         /* We are read-only from user side */
 135         libvlc_printerr( "Attempt to write a read-only media list" );
 136         return false;
 137     }
 138     return true;
 139 }
 140
 141 /*
 142  * Public libvlc functions
 143  */
 144
 145 /**************************************************************************
 146  *       libvlc_media_list_new (Public)
 147  *
 148  * Init an object.
 149  **************************************************************************/
 150 libvlc_media_list_t *
 151 libvlc_media_list_new( libvlc_instance_t * p_inst )
 152 {
 153     libvlc_media_list_t * p_mlist;
 154
 155     p_mlist = malloc(sizeof(libvlc_media_list_t));
 156     if( unlikely(p_mlist == NULL) )
 157     {
 158         libvlc_printerr( "Not enough memory" );
 159         return NULL;
 160     }
 161
 162     p_mlist->p_libvlc_instance = p_inst;
 163     libvlc_event_manager_init( &p_mlist->event_manager, p_mlist );
 164     p_mlist->b_read_only = false;
 165
 166     vlc_mutex_init( &p_mlist->object_lock );
 167     vlc_mutex_init( &p_mlist->refcount_lock ); // FIXME: spinlock?
 168
 169     vlc_array_init( &p_mlist->items );
 170     assert( p_mlist->items.i_count == 0 );
 171     p_mlist->i_refcount = 1;
 172     p_mlist->p_md = NULL;
 173     p_mlist->p_internal_md = NULL;
 174
 175     libvlc_retain( p_inst );
 176     return p_mlist;
 177 }
 178
 179 /**************************************************************************
 180  *       libvlc_media_list_release (Public)
 181  *
 182  * Release an object.
 183  **************************************************************************/
 184 void libvlc_media_list_release( libvlc_media_list_t * p_mlist )
 185 {
 186     vlc_mutex_lock( &p_mlist->refcount_lock );
 187     p_mlist->i_refcount--;
 188     if( p_mlist->i_refcount > 0 )
 189     {
 190         vlc_mutex_unlock( &p_mlist->refcount_lock );
 191         return;
 192     }
 193     vlc_mutex_unlock( &p_mlist->refcount_lock );
 194
 195     /* Refcount null, time to free */
 196
 197     libvlc_event_manager_destroy( &p_mlist->event_manager );
 198     libvlc_media_release( p_mlist->p_md );
 199
 200     for( size_t i = 0; i < vlc_array_count( &p_mlist->items ); i++ )
 201     {
 202         libvlc_media_t* p_md = vlc_array_item_at_index( &p_mlist->items, i );
 203         libvlc_media_release( p_md );
 204     }
 205
 206     vlc_mutex_destroy( &p_mlist->object_lock );
 207     vlc_mutex_destroy( &p_mlist->refcount_lock );
 208     vlc_array_clear( &p_mlist->items );
 209
 210     libvlc_release( p_mlist->p_libvlc_instance );
 211     free( p_mlist );
 212 }
 213
 214 /**************************************************************************
 215  *       libvlc_media_list_retain (Public)
 216  *
 217  * Increase an object refcount.
 218  **************************************************************************/
 219 void libvlc_media_list_retain( libvlc_media_list_t * p_mlist )
 220 {
 221     vlc_mutex_lock( &p_mlist->refcount_lock );
 222     p_mlist->i_refcount++;
 223     vlc_mutex_unlock( &p_mlist->refcount_lock );
 224 }
 225
 226
 227 /**************************************************************************
 228  *       add_file_content (Public)
 229  **************************************************************************/
 230 int
 231 libvlc_media_list_add_file_content( libvlc_media_list_t * p_mlist,
 232                                     const char * psz_uri )
 233 {
 234     input_item_t * p_input_item;
 235     libvlc_media_t * p_md;
 236
 237     p_input_item = input_item_New( psz_uri, _("Media Library") );
 238
 239     if( !p_input_item )
 240     {
 241         libvlc_printerr( "Not enough memory" );
 242         return -1;
 243     }
 244
 245     p_md = libvlc_media_new_from_input_item( p_mlist->p_libvlc_instance,
 246                                              p_input_item );
 247     if( !p_md )
 248     {
 249         input_item_Release( p_input_item );
 250         return -1;
 251     }
 252
 253     if( libvlc_media_list_add_media( p_mlist, p_md ) )
 254     {
 255 #warning Missing error handling!
 256         /* printerr and leaks */
 257         return -1;
 258     }
 259
 260     input_Read( p_mlist->p_libvlc_instance->p_libvlc_int, p_input_item );
 261     return 0;
 262 }
 263
 264 /**************************************************************************
 265  *       set_media (Public)
 266  **************************************************************************/
 267 void libvlc_media_list_set_media( libvlc_media_list_t * p_mlist,
 268                                   libvlc_media_t * p_md )
 269
 270 {
 271     vlc_mutex_lock( &p_mlist->object_lock );
 272     if( p_mlist->p_internal_md || !mlist_is_writable(p_mlist) )
 273     {
 274         vlc_mutex_unlock( &p_mlist->object_lock );
 275         return;
 276     }
 277     libvlc_media_release( p_mlist->p_md );
 278     libvlc_media_retain( p_md );
 279     p_mlist->p_md = p_md;
 280     vlc_mutex_unlock( &p_mlist->object_lock );
 281 }
 282
 283 /**************************************************************************
 284  *       media (Public)
 285  *
 286  * If this media_list comes is a media's subitems,
 287  * This holds the corresponding media.
 288  * This md is also seen as the information holder for the media_list.
 289  * Indeed a media_list can have meta information through this
 290  * media.
 291  **************************************************************************/
 292 libvlc_media_t *
 293 libvlc_media_list_media( libvlc_media_list_t * p_mlist )
 294 {
 295     libvlc_media_t *p_md;
 296
 297     vlc_mutex_lock( &p_mlist->object_lock );
 298     p_md = p_mlist->p_internal_md ? p_mlist->p_internal_md : p_mlist->p_md;
 299     if( p_md )
 300         libvlc_media_retain( p_md );
 301     vlc_mutex_unlock( &p_mlist->object_lock );
 302
 303     return p_md;
 304 }
 305
 306 /**************************************************************************
 307  *       libvlc_media_list_count (Public)
 308  *
 309  * Lock should be held when entering.
 310  **************************************************************************/
 311 int libvlc_media_list_count( libvlc_media_list_t * p_mlist )
 312 {
 313     return vlc_array_count( &p_mlist->items );
 314 }
 315
 316 /**************************************************************************
 317  *       libvlc_media_list_add_media (Public)
 318  *
 319  * Lock should be held when entering.
 320  **************************************************************************/
 321 int libvlc_media_list_add_media( libvlc_media_list_t * p_mlist,
 322                                  libvlc_media_t * p_md )
 323 {
 324     if( !mlist_is_writable(p_mlist) )
 325         return -1;
 326     libvlc_media_list_internal_add_media( p_mlist, p_md );
 327     return 0;
 328 }
 329
 330 /* LibVLC internal version */
 331 void libvlc_media_list_internal_add_media( libvlc_media_list_t * p_mlist,
 332                                            libvlc_media_t * p_md )
 333 {
 334     libvlc_media_retain( p_md );
 335
 336     notify_item_addition( p_mlist, p_md, vlc_array_count( &p_mlist->items ),
 337                           EventWillHappen );
 338     vlc_array_append( &p_mlist->items, p_md );
 339     notify_item_addition( p_mlist, p_md, vlc_array_count( &p_mlist->items )-1,
 340                           EventDidHappen );
 341 }
 342
 343 /**************************************************************************
 344  *       libvlc_media_list_insert_media (Public)
 345  *
 346  * Lock should be hold when entering.
 347  **************************************************************************/
 348 int libvlc_media_list_insert_media( libvlc_media_list_t * p_mlist,
 349                                     libvlc_media_t * p_md,
 350                                     int index )
 351 {
 352     if( !mlist_is_writable(p_mlist) )
 353         return -1;
 354     libvlc_media_list_internal_insert_media( p_mlist, p_md, index );
 355     return 0;
 356 }
 357
 358 /* LibVLC internal version */
 359 void libvlc_media_list_internal_insert_media( libvlc_media_list_t * p_mlist,
 360                                               libvlc_media_t * p_md,
 361                                               int index )
 362 {
 363     libvlc_media_retain( p_md );
 364
 365     notify_item_addition( p_mlist, p_md, index, EventWillHappen );
 366     vlc_array_insert( &p_mlist->items, p_md, index );
 367     notify_item_addition( p_mlist, p_md, index, EventDidHappen );
 368 }
 369
 370 /**************************************************************************
 371  *       libvlc_media_list_remove_index (Public)
 372  *
 373  * Lock should be held when entering.
 374  **************************************************************************/
 375 int libvlc_media_list_remove_index( libvlc_media_list_t * p_mlist,
 376                                      int index )
 377 {
 378     if( !mlist_is_writable(p_mlist) )
 379         return -1;
 380     return libvlc_media_list_internal_remove_index( p_mlist, index );
 381 }
 382
 383 /* LibVLC internal version */
 384 int libvlc_media_list_internal_remove_index( libvlc_media_list_t * p_mlist,
 385                                              int index )
 386 {
 387     libvlc_media_t * p_md;
 388
 389     if( (size_t) index >= vlc_array_count( &p_mlist->items ))
 390     {
 391         libvlc_printerr( "Index out of bounds" );
 392         return -1;
 393     }
 394
 395     p_md = vlc_array_item_at_index( &p_mlist->items, index );
 396
 397     notify_item_deletion( p_mlist, p_md, index, EventWillHappen );
 398     vlc_array_remove( &p_mlist->items, index );
 399     notify_item_deletion( p_mlist, p_md, index, EventDidHappen );
 400
 401     libvlc_media_release( p_md );
 402     return 0;
 403 }
 404
 405 /**************************************************************************
 406  *       libvlc_media_list_item_at_index (Public)
 407  *
 408  * Lock should be held when entering.
 409  **************************************************************************/
 410 libvlc_media_t *
 411 libvlc_media_list_item_at_index( libvlc_media_list_t * p_mlist,
 412                                  int index )
 413 {
 414     libvlc_media_t * p_md;
 415
 416     if( (size_t) index >= vlc_array_count( &p_mlist->items ))
 417     {
 418         libvlc_printerr( "Index out of bounds" );
 419         return NULL;
 420     }
 421
 422     p_md = vlc_array_item_at_index( &p_mlist->items, index );
 423     libvlc_media_retain( p_md );
 424     return p_md;
 425 }
 426
 427 /**************************************************************************
 428  *       libvlc_media_list_index_of_item (Public)
 429  *
 430  * Lock should be held when entering.
 431  * Warning: this function returns the first matching item.
 432  **************************************************************************/
 433 int libvlc_media_list_index_of_item( libvlc_media_list_t * p_mlist,
 434                                      libvlc_media_t * p_searched_md )
 435 {
 436     int idx = vlc_array_index_of_item( &p_mlist->items, p_searched_md );
 437     if( idx == -1 )
 438         libvlc_printerr( "Media not found" );
 439
 440     return idx;
 441 }
 442
 443 /**************************************************************************
 444  *       libvlc_media_list_is_readonly (Public)
 445  *
 446  * This indicates if this media list is read-only from a user point of view
 447  **************************************************************************/
 448 int libvlc_media_list_is_readonly( libvlc_media_list_t * p_mlist )
 449 {
 450     return p_mlist->b_read_only;
 451 }
 452
 453 /**************************************************************************
 454  *       libvlc_media_list_lock (Public)
 455  *
 456  * The lock must be held in access operations. It is never used in the
 457  * Public method.
 458  **************************************************************************/
 459 void libvlc_media_list_lock( libvlc_media_list_t * p_mlist )
 460 {
 461     vlc_mutex_lock( &p_mlist->object_lock );
 462 }
 463
 464
 465 /**************************************************************************
 466  *       libvlc_media_list_unlock (Public)
 467  *
 468  * The lock must be held in access operations
 469  **************************************************************************/
 470 void libvlc_media_list_unlock( libvlc_media_list_t * p_mlist )
 471 {
 472     vlc_mutex_unlock( &p_mlist->object_lock );
 473 }
 474
 475
 476 /**************************************************************************
 477  *       libvlc_media_list_event_manager (Public)
 478  *
 479  * The p_event_manager is immutable, so you don't have to hold the lock
 480  **************************************************************************/
 481 libvlc_event_manager_t *
 482 libvlc_media_list_event_manager( libvlc_media_list_t * p_mlist )
 483 {
 484     return &p_mlist->event_manager;
 485 }