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

   1 /*****************************************************************************
   2  * media_list.c: libvlc new API media list 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 #include "libvlc_internal.h"
  25 #include <vlc/libvlc.h>
  26 #include <assert.h>
  27 #include "vlc_arrays.h"
  28
  29 /*
  30  * Private functions
  31  */
  32
  33 /**************************************************************************
  34  *       notify_item_addition (private)
  35  *
  36  * Call parent playlist and send the appropriate event.
  37  **************************************************************************/
  38 static void
  39 notify_item_addition( libvlc_media_list_t * p_mlist,
  40                       libvlc_media_descriptor_t * p_md,
  41                       int index )
  42 {
  43     libvlc_event_t event;
  44
  45     event.type = libvlc_MediaListItemAdded;
  46     event.u.media_list_item_added.item = p_md;
  47     event.u.media_list_item_added.index = index;
  48
  49     libvlc_event_send( p_mlist->p_event_manager, &event );
  50 }
  51
  52 /**************************************************************************
  53  *       notify_item_deletion (private)
  54  *
  55  * Call parent playlist and send the appropriate event.
  56  **************************************************************************/
  57 static void
  58 notify_item_deletion( libvlc_media_list_t * p_mlist,
  59                       libvlc_media_descriptor_t * p_md,
  60                       int index )
  61 {
  62     libvlc_event_t event;
  63
  64     event.type = libvlc_MediaListItemDeleted;
  65     event.u.media_list_item_deleted.item = p_md;
  66     event.u.media_list_item_deleted.index = index;
  67
  68     libvlc_event_send( p_mlist->p_event_manager, &event );
  69 }
  70
  71 /**************************************************************************
  72  *       dynamic_list_propose_item (private) (Event Callback)
  73  *
  74  * This is called if the dynamic sublist's data provider adds a new item.
  75  **************************************************************************/
  76 static void
  77 dynamic_list_propose_item( const libvlc_event_t * p_event, void * p_user_data )
  78 {
  79     libvlc_media_list_t * p_submlist = p_user_data;
  80     libvlc_media_descriptor_t * p_md = p_event->u.media_list_item_added.item;
  81
  82     //libvlc_media_descriptor_lock( p_md );
  83     if( libvlc_tag_query_match( p_submlist->p_query, p_md, NULL ) )
  84     {
  85         libvlc_media_list_lock( p_submlist );
  86         libvlc_media_list_add_media_descriptor( p_submlist, p_md, NULL );
  87         libvlc_media_list_unlock( p_submlist );
  88     }
  89     //libvlc_media_descriptor_unlock( p_md );
  90 }
  91
  92 /**************************************************************************
  93  *       dynamic_list_remove_item (private) (Event Callback)
  94  *
  95  * This is called if the dynamic sublist's data provider adds a new item.
  96  **************************************************************************/
  97 static void
  98 dynamic_list_remove_item( const libvlc_event_t * p_event, void * p_user_data )
  99 {
 100     libvlc_media_list_t * p_submlist = p_user_data;
 101     libvlc_media_descriptor_t * p_md = p_event->u.media_list_item_deleted.item;
 102
 103     //libvlc_media_descriptor_lock( p_md );
 104     if( libvlc_tag_query_match( p_submlist->p_query, p_md, NULL ) )
 105     {
 106         int i;
 107         libvlc_media_list_lock( p_submlist );
 108         i = libvlc_media_list_index_of_item( p_submlist, p_md, NULL );
 109         if ( i < 0 )
 110         {
 111             /* We've missed one item addition, that could happen especially
 112              * if we add item in a threaded maner, so we just ignore */
 113             libvlc_media_list_unlock( p_submlist );
 114             //libvlc_media_descriptor_unlock( p_md );
 115             return;
 116         }
 117         libvlc_media_list_remove_index( p_submlist, i, NULL );
 118         libvlc_media_list_unlock( p_submlist );
 119     }
 120     //libvlc_media_descriptor_unlock( p_md );
 121 }
 122
 123 /**************************************************************************
 124  *       dynamic_list_change_item (private) (Event Callback)
 125  *
 126  * This is called if the dynamic sublist's data provider adds a new item.
 127  **************************************************************************/
 128 static void
 129 dynamic_list_change_item( const libvlc_event_t * p_event , void * p_user_data)
 130 {
 131     libvlc_media_list_t * p_submlist = p_user_data;
 132     libvlc_media_descriptor_t * p_md = p_event->u.media_list_item_changed.item;
 133     int index;
 134
 135     libvlc_media_list_lock( p_submlist );
 136
 137     index = libvlc_media_list_index_of_item( p_submlist, p_md, NULL );
 138     if( index < 0 )
 139     {
 140         libvlc_media_list_unlock( p_submlist );
 141         return; /* Not found, no prob, just ignore */
 142     }
 143
 144     //libvlc_media_descriptor_lock( p_md );
 145     if( !libvlc_tag_query_match( p_submlist->p_query, p_md, NULL ) )
 146         libvlc_media_list_remove_index( p_submlist, index, NULL );
 147     //libvlc_media_descriptor_unlock( p_md );
 148
 149     libvlc_media_list_unlock( p_submlist );
 150 }
 151
 152 /*
 153  * Public libvlc functions
 154  */
 155
 156 /**************************************************************************
 157  *       libvlc_media_list_new (Public)
 158  *
 159  * Init an object.
 160  **************************************************************************/
 161 libvlc_media_list_t *
 162 libvlc_media_list_new( libvlc_instance_t * p_inst,
 163                        libvlc_exception_t * p_e )
 164 {
 165     libvlc_media_list_t * p_mlist;
 166
 167     p_mlist = malloc(sizeof(libvlc_media_list_t));
 168
 169     if( !p_mlist )
 170         return NULL;
 171
 172     p_mlist->p_libvlc_instance = p_inst;
 173     p_mlist->p_event_manager = libvlc_event_manager_new( p_mlist, p_inst, p_e );
 174
 175     libvlc_event_manager_register_event_type( p_mlist->p_event_manager,
 176             libvlc_MediaListItemAdded, p_e );
 177     libvlc_event_manager_register_event_type( p_mlist->p_event_manager,
 178             libvlc_MediaListItemChanged, p_e );
 179     libvlc_event_manager_register_event_type( p_mlist->p_event_manager,
 180             libvlc_MediaListItemDeleted, p_e );
 181
 182     if( libvlc_exception_raised( p_e ) )
 183     {
 184         libvlc_event_manager_release( p_mlist->p_event_manager );
 185         free( p_mlist );
 186         return NULL;
 187     }
 188
 189     vlc_mutex_init( p_inst->p_libvlc_int, &p_mlist->object_lock );
 190
 191     ARRAY_INIT(p_mlist->items);
 192     p_mlist->i_refcount = 1;
 193     p_mlist->p_media_provider = NULL;
 194
 195     return p_mlist;
 196 }
 197
 198 /**************************************************************************
 199  *       libvlc_media_list_release (Public)
 200  *
 201  * Release an object.
 202  **************************************************************************/
 203 void libvlc_media_list_release( libvlc_media_list_t * p_mlist )
 204 {
 205     libvlc_media_descriptor_t * p_md;
 206
 207     vlc_mutex_lock( &p_mlist->object_lock );
 208     p_mlist->i_refcount--;
 209     if( p_mlist->i_refcount > 0 )
 210     {
 211         vlc_mutex_unlock( &p_mlist->object_lock );
 212         return;
 213     }
 214     vlc_mutex_unlock( &p_mlist->object_lock );
 215
 216     /* Refcount null, time to free */
 217     if( p_mlist->p_media_provider )
 218         libvlc_media_list_release( p_mlist->p_media_provider );
 219
 220     if( p_mlist->p_query )
 221         libvlc_tag_query_release( p_mlist->p_query );
 222
 223     libvlc_event_manager_release( p_mlist->p_event_manager );
 224
 225     FOREACH_ARRAY( p_md, p_mlist->items )
 226         libvlc_media_descriptor_release( p_md );
 227     FOREACH_END()
 228
 229     free( p_mlist );
 230 }
 231 /**************************************************************************
 232  *       libvlc_media_list_retain (Public)
 233  *
 234  * Increase an object refcount.
 235  **************************************************************************/
 236 void libvlc_media_list_retain( libvlc_media_list_t * p_mlist )
 237 {
 238     vlc_mutex_lock( &p_mlist->object_lock );
 239     p_mlist->i_refcount++;
 240     vlc_mutex_unlock( &p_mlist->object_lock );
 241 }
 242
 243 /**************************************************************************
 244  *       libvlc_media_list_count (Public)
 245  *
 246  * Lock should be hold when entering.
 247  **************************************************************************/
 248 int libvlc_media_list_count( libvlc_media_list_t * p_mlist,
 249                              libvlc_exception_t * p_e )
 250 {
 251     (void)p_e;
 252     return p_mlist->items.i_size;
 253 }
 254
 255 /**************************************************************************
 256  *       libvlc_media_list_add_media_descriptor (Public)
 257  *
 258  * Lock should be hold when entering.
 259  **************************************************************************/
 260 void libvlc_media_list_add_media_descriptor(
 261                                    libvlc_media_list_t * p_mlist,
 262                                    libvlc_media_descriptor_t * p_md,
 263                                    libvlc_exception_t * p_e )
 264 {
 265     (void)p_e;
 266     libvlc_media_descriptor_retain( p_md );
 267
 268     ARRAY_APPEND( p_mlist->items, p_md );
 269     notify_item_addition( p_mlist, p_md, p_mlist->items.i_size-1 );
 270 }
 271
 272 /**************************************************************************
 273  *       libvlc_media_list_insert_media_descriptor (Public)
 274  *
 275  * Lock should be hold when entering.
 276  **************************************************************************/
 277 void libvlc_media_list_insert_media_descriptor(
 278                                    libvlc_media_list_t * p_mlist,
 279                                    libvlc_media_descriptor_t * p_md,
 280                                    int index,
 281                                    libvlc_exception_t * p_e )
 282 {
 283     (void)p_e;
 284     libvlc_media_descriptor_retain( p_md );
 285
 286     ARRAY_INSERT( p_mlist->items, p_md, index);
 287     notify_item_addition( p_mlist, p_md, index );
 288 }
 289
 290 /**************************************************************************
 291  *       libvlc_media_list_remove_index (Public)
 292  *
 293  * Lock should be hold when entering.
 294  **************************************************************************/
 295 void libvlc_media_list_remove_index( libvlc_media_list_t * p_mlist,
 296                                      int index,
 297                                      libvlc_exception_t * p_e )
 298 {
 299     libvlc_media_descriptor_t * p_md;
 300
 301     p_md = ARRAY_VAL( p_mlist->items, index );
 302
 303     ARRAY_REMOVE( p_mlist->items, index )
 304     notify_item_deletion( p_mlist, p_md, index );
 305
 306     libvlc_media_descriptor_release( p_md );
 307 }
 308
 309 /**************************************************************************
 310  *       libvlc_media_list_item_at_index (Public)
 311  *
 312  * Lock should be hold when entering.
 313  **************************************************************************/
 314 libvlc_media_descriptor_t *
 315 libvlc_media_list_item_at_index( libvlc_media_list_t * p_mlist,
 316                                  int index,
 317                                  libvlc_exception_t * p_e )
 318 {
 319     return ARRAY_VAL( p_mlist->items, index );
 320 }
 321
 322 /**************************************************************************
 323  *       libvlc_media_list_index_of_item (Public)
 324  *
 325  * Lock should be hold when entering.
 326  * Warning: this function would return the first matching item
 327  **************************************************************************/
 328 int libvlc_media_list_index_of_item( libvlc_media_list_t * p_mlist,
 329                                      libvlc_media_descriptor_t * p_searched_md,
 330                                      libvlc_exception_t * p_e )
 331 {
 332     libvlc_media_descriptor_t * p_md;
 333     FOREACH_ARRAY( p_md, p_mlist->items )
 334         if( p_searched_md == p_md )
 335             return fe_idx; /* Once more, we hate macro for that */
 336     FOREACH_END()
 337     return -1;
 338 }
 339
 340 /**************************************************************************
 341  *       libvlc_media_list_lock (Public)
 342  *
 343  * The lock must be held in access operations. It is never used in the
 344  * Public method.
 345  **************************************************************************/
 346 void libvlc_media_list_lock( libvlc_media_list_t * p_mlist )
 347 {
 348     vlc_mutex_lock( &p_mlist->object_lock );
 349 }
 350
 351
 352 /**************************************************************************
 353  *       libvlc_media_list_unlock (Public)
 354  *
 355  * The lock must be held in access operations
 356  **************************************************************************/
 357 void libvlc_media_list_unlock( libvlc_media_list_t * p_mlist )
 358 {
 359     vlc_mutex_unlock( &p_mlist->object_lock );
 360 }
 361
 362
 363
 364 /**************************************************************************
 365  *       libvlc_media_list_p_event_manager (Public)
 366  *
 367  * The p_event_manager is immutable, so you don't have to hold the lock
 368  **************************************************************************/
 369 libvlc_event_manager_t *
 370 libvlc_media_list_event_manager( libvlc_media_list_t * p_mlist,
 371                                     libvlc_exception_t * p_e )
 372 {
 373     (void)p_e;
 374     return p_mlist->p_event_manager;
 375 }
 376
 377 /**************************************************************************
 378  *       libvlc_media_list_dynamic_sublist (Public)
 379  *
 380  * Lock should be hold when entering.
 381  **************************************************************************/
 382 libvlc_media_list_t *
 383 libvlc_media_list_dynamic_sublist( libvlc_media_list_t * p_mlist,
 384                                    libvlc_tag_query_t * p_query,
 385                                    libvlc_exception_t * p_e )
 386 {
 387     libvlc_media_list_t * p_submlist;
 388     libvlc_event_manager_t * p_em;
 389     int count, i;
 390
 391     (void)p_e;
 392
 393     p_submlist = libvlc_media_list_new( p_mlist->p_libvlc_instance, p_e );
 394     if( !p_submlist )
 395     {
 396         if( !libvlc_exception_raised( p_e ) )
 397             libvlc_exception_raise( p_e, "Can't get the new media_list" );
 398         return NULL;
 399     }
 400
 401     /* We have a query */
 402     libvlc_tag_query_retain( p_query );
 403     p_submlist->p_query = p_query;
 404
 405     /* We have a media provider */
 406     libvlc_media_list_retain( p_mlist );
 407     p_submlist->p_media_provider = p_mlist;
 408
 409
 410     libvlc_media_list_lock( p_submlist );
 411
 412     count = libvlc_media_list_count( p_mlist, p_e );
 413
 414     /* This should be running in a thread, a good plan to achieve that
 415      * move all the dynamic code to libvlc_tag_query. */
 416     for( i = 0; i < count; i++ )
 417     {
 418         libvlc_media_descriptor_t * p_md;
 419         p_md = libvlc_media_list_item_at_index( p_mlist, i, p_e );
 420         if( libvlc_tag_query_match( p_query, p_md, NULL ) )
 421             libvlc_media_list_add_media_descriptor( p_submlist, p_md, p_e );
 422     }
 423
 424     /* And we will listen to its event, so we can update p_submlist
 425      * accordingly */
 426     p_em = libvlc_media_list_event_manager( p_mlist, p_e );
 427     libvlc_event_attach( p_em, libvlc_MediaListItemAdded,
 428                          dynamic_list_propose_item, p_submlist, p_e );
 429     libvlc_event_attach( p_em, libvlc_MediaListItemDeleted,
 430                          dynamic_list_remove_item, p_submlist, p_e );
 431     libvlc_event_attach( p_em, libvlc_MediaListItemChanged,
 432                          dynamic_list_change_item, p_submlist, p_e );
 433
 434     libvlc_media_list_unlock( p_submlist );
 435
 436     return p_submlist;
 437 }
 438