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 typedef enum EventPlaceInTime {
  30     EventWillHappen,
  31     EventDidHappen
  32 } EventPlaceInTime;
  33
  34 //#define DEBUG_MEDIA_LIST
  35
  36 #ifdef DEBUG_MEDIA_LIST
  37 # define trace( fmt, ... ) printf( "%s(): " fmt, __FUNCTION__, ##__VA_ARGS__ )
  38 #else
  39 # define trace( ... )
  40 #endif
  41
  42 /*
  43  * Private functions
  44  */
  45
  46
  47
  48 /**************************************************************************
  49  *       notify_item_addition (private)
  50  *
  51  * Do the appropriate action when an item is deleted.
  52  **************************************************************************/
  53 static void
  54 notify_item_addition( libvlc_media_list_t * p_mlist,
  55                       libvlc_media_t * p_md,
  56                       int index,
  57                       EventPlaceInTime event_status )
  58 {
  59     libvlc_event_t event;
  60
  61     /* Construct the event */
  62     if( event_status == EventDidHappen )
  63     {
  64         trace("item was added at index %d\n", index);
  65         event.type = libvlc_MediaListItemAdded;
  66         event.u.media_list_item_added.item = p_md;
  67         event.u.media_list_item_added.index = index;
  68     }
  69     else /* if( event_status == EventWillHappen ) */
  70     {
  71         event.type = libvlc_MediaListWillAddItem;
  72         event.u.media_list_will_add_item.item = p_md;
  73         event.u.media_list_will_add_item.index = index;
  74     }
  75
  76     /* Send the event */
  77     libvlc_event_send( p_mlist->p_event_manager, &event );
  78 }
  79
  80 /**************************************************************************
  81  *       notify_item_deletion (private)
  82  *
  83  * Do the appropriate action when an item is added.
  84  **************************************************************************/
  85 static void
  86 notify_item_deletion( libvlc_media_list_t * p_mlist,
  87                       libvlc_media_t * p_md,
  88                       int index,
  89                       EventPlaceInTime event_status )
  90 {
  91     libvlc_event_t event;
  92
  93     /* Construct the event */
  94     if( event_status == EventDidHappen )
  95     {
  96         trace("item at index %d was deleted\n", index);
  97         event.type = libvlc_MediaListItemDeleted;
  98         event.u.media_list_item_deleted.item = p_md;
  99         event.u.media_list_item_deleted.index = index;
 100     }
 101     else /* if( event_status == EventWillHappen ) */
 102     {
 103         event.type = libvlc_MediaListWillDeleteItem;
 104         event.u.media_list_will_delete_item.item = p_md;
 105         event.u.media_list_will_delete_item.index = index;
 106     }
 107
 108     /* Send the event */
 109     libvlc_event_send( p_mlist->p_event_manager, &event );
 110 }
 111
 112 /**************************************************************************
 113  *       static mlist_is_writable (private)
 114  *
 115  * Raise exception and return 0 when the media_list instance is read-only,
 116  * or else return 1.
 117  **************************************************************************/
 118 static inline
 119 int mlist_is_writable( libvlc_media_list_t *p_mlist, libvlc_exception_t *p_e )
 120 {
 121     if( !p_mlist||p_mlist->b_read_only )
 122     {
 123         /* We are read-only from user side */
 124         libvlc_exception_raise( p_e, "Cannot write to read-only media list." );
 125         return 0;
 126     }
 127     return 1;
 128 }
 129
 130 /*
 131  * Public libvlc functions
 132  */
 133
 134 /**************************************************************************
 135  *       libvlc_media_list_new (Public)
 136  *
 137  * Init an object.
 138  **************************************************************************/
 139 libvlc_media_list_t *
 140 libvlc_media_list_new( libvlc_instance_t * p_inst,
 141                        libvlc_exception_t * p_e )
 142 {
 143     libvlc_media_list_t * p_mlist;
 144
 145     p_mlist = malloc(sizeof(libvlc_media_list_t));
 146     if( !p_mlist )
 147         return NULL;
 148
 149     p_mlist->p_libvlc_instance = p_inst;
 150     p_mlist->p_event_manager = libvlc_event_manager_new( p_mlist, p_inst, p_e );
 151
 152     /* Code for that one should be handled in flat_media_list.c */
 153     p_mlist->p_flat_mlist = NULL;
 154     p_mlist->b_read_only = false;
 155
 156     libvlc_event_manager_register_event_type( p_mlist->p_event_manager,
 157             libvlc_MediaListItemAdded, p_e );
 158     libvlc_event_manager_register_event_type( p_mlist->p_event_manager,
 159             libvlc_MediaListWillAddItem, p_e );
 160     libvlc_event_manager_register_event_type( p_mlist->p_event_manager,
 161             libvlc_MediaListItemDeleted, p_e );
 162     libvlc_event_manager_register_event_type( p_mlist->p_event_manager,
 163             libvlc_MediaListWillDeleteItem, p_e );
 164
 165     if( libvlc_exception_raised( p_e ) )
 166     {
 167         libvlc_event_manager_release( p_mlist->p_event_manager );
 168         free( p_mlist );
 169         return NULL;
 170     }
 171
 172     vlc_mutex_init( &p_mlist->object_lock );
 173     vlc_mutex_init( &p_mlist->refcount_lock ); // FIXME: spinlock?
 174
 175     vlc_array_init( &p_mlist->items );
 176     p_mlist->i_refcount = 1;
 177     p_mlist->p_md = NULL;
 178
 179     return p_mlist;
 180 }
 181
 182 /**************************************************************************
 183  *       libvlc_media_list_release (Public)
 184  *
 185  * Release an object.
 186  **************************************************************************/
 187 void libvlc_media_list_release( libvlc_media_list_t * p_mlist )
 188 {
 189     libvlc_media_t * p_md;
 190     int i;
 191
 192     vlc_mutex_lock( &p_mlist->refcount_lock );
 193     p_mlist->i_refcount--;
 194     if( p_mlist->i_refcount > 0 )
 195     {
 196         vlc_mutex_unlock( &p_mlist->refcount_lock );
 197         return;
 198     }
 199     vlc_mutex_unlock( &p_mlist->refcount_lock );
 200
 201     /* Refcount null, time to free */
 202
 203     libvlc_event_manager_release( p_mlist->p_event_manager );
 204
 205     libvlc_media_release( p_mlist->p_md );
 206
 207     for ( i = 0; i < vlc_array_count( &p_mlist->items ); i++ )
 208     {
 209         p_md = vlc_array_item_at_index( &p_mlist->items, i );
 210         libvlc_media_release( p_md );
 211     }
 212
 213     vlc_mutex_destroy( &p_mlist->object_lock );
 214     vlc_array_clear( &p_mlist->items );
 215
 216     free( p_mlist );
 217 }
 218
 219 /**************************************************************************
 220  *       libvlc_media_list_retain (Public)
 221  *
 222  * Increase an object refcount.
 223  **************************************************************************/
 224 void libvlc_media_list_retain( libvlc_media_list_t * p_mlist )
 225 {
 226     vlc_mutex_lock( &p_mlist->refcount_lock );
 227     p_mlist->i_refcount++;
 228     vlc_mutex_unlock( &p_mlist->refcount_lock );
 229 }
 230
 231
 232 /**************************************************************************
 233  *       add_file_content (Public)
 234  **************************************************************************/
 235 void
 236 libvlc_media_list_add_file_content( libvlc_media_list_t * p_mlist,
 237                                     const char * psz_uri,
 238                                     libvlc_exception_t * p_e )
 239 {
 240     input_item_t * p_input_item;
 241     libvlc_media_t * p_md;
 242
 243     p_input_item = input_item_NewExt(
 244                            p_mlist->p_libvlc_instance->p_libvlc_int, psz_uri,
 245                                          _("Media Library"), 0, NULL, 0, -1 );
 246
 247     if( !p_input_item )
 248     {
 249         libvlc_exception_raise( p_e, "Can't create an input item" );
 250         return;
 251     }
 252
 253     p_md = libvlc_media_new_from_input_item(
 254             p_mlist->p_libvlc_instance,
 255             p_input_item, p_e );
 256
 257     if( !p_md )
 258     {
 259         vlc_gc_decref( p_input_item );
 260         return;
 261     }
 262
 263     libvlc_media_list_add_media( p_mlist, p_md, p_e );
 264     if( libvlc_exception_raised( p_e ) )
 265         return;
 266
 267     input_Read( p_mlist->p_libvlc_instance->p_libvlc_int, p_input_item, true );
 268
 269     return;
 270 }
 271
 272 /**************************************************************************
 273  *       set_media (Public)
 274  **************************************************************************/
 275 void libvlc_media_list_set_media( libvlc_media_list_t * p_mlist,
 276                                              libvlc_media_t * p_md,
 277                                              libvlc_exception_t * p_e)
 278
 279 {
 280     VLC_UNUSED(p_e);
 281     vlc_mutex_lock( &p_mlist->object_lock );
 282     libvlc_media_release( p_mlist->p_md );
 283     libvlc_media_retain( p_md );
 284     p_mlist->p_md = p_md;
 285     vlc_mutex_unlock( &p_mlist->object_lock );
 286 }
 287
 288 /**************************************************************************
 289  *       media (Public)
 290  *
 291  * If this media_list comes is a media's subitems,
 292  * This holds the corresponding media.
 293  * This md is also seen as the information holder for the media_list.
 294  * Indeed a media_list can have meta information through this
 295  * media.
 296  **************************************************************************/
 297 libvlc_media_t *
 298 libvlc_media_list_media( libvlc_media_list_t * p_mlist,
 299                                     libvlc_exception_t * p_e)
 300 {
 301     libvlc_media_t *p_md;
 302     VLC_UNUSED(p_e);
 303
 304     vlc_mutex_lock( &p_mlist->object_lock );
 305     p_md = p_mlist->p_md;
 306     if( p_md )
 307         libvlc_media_retain( p_md );
 308     vlc_mutex_unlock( &p_mlist->object_lock );
 309
 310     return p_md;
 311 }
 312
 313 /**************************************************************************
 314  *       libvlc_media_list_count (Public)
 315  *
 316  * Lock should be hold when entering.
 317  **************************************************************************/
 318 int libvlc_media_list_count( libvlc_media_list_t * p_mlist,
 319                              libvlc_exception_t * p_e )
 320 {
 321     VLC_UNUSED(p_e);
 322     return vlc_array_count( &p_mlist->items );
 323 }
 324
 325 /**************************************************************************
 326  *       libvlc_media_list_add_media (Public)
 327  *
 328  * Lock should be held when entering.
 329  **************************************************************************/
 330 void libvlc_media_list_add_media(
 331                                    libvlc_media_list_t * p_mlist,
 332                                    libvlc_media_t * p_md,
 333                                    libvlc_exception_t * p_e )
 334 {
 335     if( mlist_is_writable(p_mlist,p_e) )
 336         _libvlc_media_list_add_media( p_mlist, p_md, p_e );
 337 }
 338
 339 /* LibVLC internal version */
 340 void _libvlc_media_list_add_media(
 341                                    libvlc_media_list_t * p_mlist,
 342                                    libvlc_media_t * p_md,
 343                                    libvlc_exception_t * p_e )
 344 {
 345     VLC_UNUSED(p_e);
 346     libvlc_media_retain( p_md );
 347
 348     notify_item_addition( p_mlist, p_md, vlc_array_count( &p_mlist->items ),
 349                           EventWillHappen );
 350     vlc_array_append( &p_mlist->items, p_md );
 351     notify_item_addition( p_mlist, p_md, vlc_array_count( &p_mlist->items )-1,
 352                           EventDidHappen );
 353 }
 354
 355 /**************************************************************************
 356  *       libvlc_media_list_insert_media (Public)
 357  *
 358  * Lock should be hold when entering.
 359  **************************************************************************/
 360 void libvlc_media_list_insert_media(
 361                                    libvlc_media_list_t * p_mlist,
 362                                    libvlc_media_t * p_md,
 363                                    int index,
 364                                    libvlc_exception_t * p_e )
 365 {
 366     if( mlist_is_writable(p_mlist,p_e) )
 367         _libvlc_media_list_insert_media( p_mlist, p_md, index, p_e );
 368 }
 369
 370 /* LibVLC internal version */
 371 void _libvlc_media_list_insert_media(
 372                                    libvlc_media_list_t * p_mlist,
 373                                    libvlc_media_t * p_md,
 374                                    int index,
 375                                    libvlc_exception_t * p_e )
 376 {
 377     VLC_UNUSED(p_e);
 378     libvlc_media_retain( p_md );
 379
 380     notify_item_addition( p_mlist, p_md, index, EventWillHappen );
 381     vlc_array_insert( &p_mlist->items, p_md, index );
 382     notify_item_addition( p_mlist, p_md, index, EventDidHappen );
 383 }
 384
 385 /**************************************************************************
 386  *       libvlc_media_list_remove_index (Public)
 387  *
 388  * Lock should be held when entering.
 389  **************************************************************************/
 390 void libvlc_media_list_remove_index( libvlc_media_list_t * p_mlist,
 391                                      int index,
 392                                      libvlc_exception_t * p_e )
 393 {
 394     if( mlist_is_writable(p_mlist,p_e) )
 395         _libvlc_media_list_remove_index( p_mlist, index, p_e );
 396 }
 397
 398 /* LibVLC internal version */
 399 void _libvlc_media_list_remove_index( libvlc_media_list_t * p_mlist,
 400                                      int index,
 401                                      libvlc_exception_t * p_e )
 402 {
 403     libvlc_media_t * p_md;
 404
 405     if( index < 0 || index >= vlc_array_count( &p_mlist->items ))
 406     {
 407         libvlc_exception_raise( p_e, "Index out of bounds");
 408         return;
 409     }
 410
 411     p_md = vlc_array_item_at_index( &p_mlist->items, index );
 412
 413     notify_item_deletion( p_mlist, p_md, index, EventWillHappen );
 414     vlc_array_remove( &p_mlist->items, index );
 415     notify_item_deletion( p_mlist, p_md, index, EventDidHappen );
 416
 417     libvlc_media_release( p_md );
 418 }
 419
 420 /**************************************************************************
 421  *       libvlc_media_list_item_at_index (Public)
 422  *
 423  * Lock should be held when entering.
 424  **************************************************************************/
 425 libvlc_media_t *
 426 libvlc_media_list_item_at_index( libvlc_media_list_t * p_mlist,
 427                                  int index,
 428                                  libvlc_exception_t * p_e )
 429 {
 430     libvlc_media_t * p_md;
 431
 432     if( index < 0 || index >= vlc_array_count( &p_mlist->items ))
 433     {
 434         libvlc_exception_raise( p_e, "Index out of bounds");
 435         return NULL;
 436     }
 437
 438     p_md = vlc_array_item_at_index( &p_mlist->items, index );
 439     libvlc_media_retain( p_md );
 440     return p_md;
 441 }
 442
 443 /**************************************************************************
 444  *       libvlc_media_list_index_of_item (Public)
 445  *
 446  * Lock should be held when entering.
 447  * Warning: this function returns the first matching item.
 448  **************************************************************************/
 449 int libvlc_media_list_index_of_item( libvlc_media_list_t * p_mlist,
 450                                      libvlc_media_t * p_searched_md,
 451                                      libvlc_exception_t * p_e )
 452 {
 453     VLC_UNUSED(p_e);
 454
 455     libvlc_media_t * p_md;
 456     int i;
 457     for ( i = 0; i < vlc_array_count( &p_mlist->items ); i++ )
 458     {
 459         p_md = vlc_array_item_at_index( &p_mlist->items, i );
 460         if( p_searched_md == p_md )
 461             return i;
 462     }
 463     return -1;
 464 }
 465
 466 /**************************************************************************
 467  *       libvlc_media_list_is_readonly (Public)
 468  *
 469  * This indicates if this media list is read-only from a user point of view
 470  **************************************************************************/
 471 int libvlc_media_list_is_readonly( libvlc_media_list_t * p_mlist )
 472 {
 473     return p_mlist->b_read_only;
 474 }
 475
 476 /**************************************************************************
 477  *       libvlc_media_list_lock (Public)
 478  *
 479  * The lock must be held in access operations. It is never used in the
 480  * Public method.
 481  **************************************************************************/
 482 void libvlc_media_list_lock( libvlc_media_list_t * p_mlist )
 483 {
 484     vlc_mutex_lock( &p_mlist->object_lock );
 485 }
 486
 487
 488 /**************************************************************************
 489  *       libvlc_media_list_unlock (Public)
 490  *
 491  * The lock must be held in access operations
 492  **************************************************************************/
 493 void libvlc_media_list_unlock( libvlc_media_list_t * p_mlist )
 494 {
 495     vlc_mutex_unlock( &p_mlist->object_lock );
 496 }
 497
 498
 499 /**************************************************************************
 500  *       libvlc_media_list_p_event_manager (Public)
 501  *
 502  * The p_event_manager is immutable, so you don't have to hold the lock
 503  **************************************************************************/
 504 libvlc_event_manager_t *
 505 libvlc_media_list_event_manager( libvlc_media_list_t * p_mlist,
 506                                     libvlc_exception_t * p_e )
 507 {
 508     VLC_UNUSED(p_e);
 509     return p_mlist->p_event_manager;
 510 }