1 /*****************************************************************************
2 * tree.c : Playlist tree walking functions
3 *****************************************************************************
4 * Copyright (C) 1999-2004 the VideoLAN team
7 * Authors: Clément Stenac <zorglub@videolan.org>
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.
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.
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 *****************************************************************************/
25 #include <vlc/input.h>
26 #include "vlc_playlist.h"
28 /************************************************************************
30 ************************************************************************/
31 playlist_item_t *GetNextUncle( playlist_t *p_playlist, playlist_item_t *p_item,
32 playlist_item_t *p_root );
33 playlist_item_t *GetPrevUncle( playlist_t *p_playlist, playlist_item_t *p_item,
34 playlist_item_t *p_root );
36 playlist_item_t *GetNextItem( playlist_t *p_playlist,
37 playlist_item_t *p_root,
38 playlist_item_t *p_item );
39 playlist_item_t *GetPrevItem( playlist_t *p_playlist,
40 playlist_item_t *p_item,
41 playlist_item_t *p_root );
44 * Create a playlist node
46 * \param p_playlist the playlist
47 * \paam psz_name the name of the node
48 * \param p_parent the parent node to attach to or NULL if no attach
49 * \return the new node
51 playlist_item_t * playlist_NodeCreate( playlist_t *p_playlist, char *psz_name,
52 playlist_item_t *p_parent )
54 input_item_t *p_input;
55 playlist_item_t *p_item;
57 if( !psz_name ) psz_name = strdup( _("Undefined") );
58 p_input = input_ItemNewWithType( VLC_OBJECT(p_playlist), NULL, psz_name,
59 0, NULL, -1, ITEM_TYPE_NODE );
60 p_input->i_id = ++p_playlist->i_last_input_id;
61 p_item = playlist_ItemNewFromInput( VLC_OBJECT(p_playlist), p_input );
62 p_item->i_children = 0;
68 INSERT_ELEM( p_playlist->pp_all_items,
69 p_playlist->i_all_size,
70 p_playlist->i_all_size,
73 if( p_parent != NULL )
75 playlist_NodeAppend( p_playlist, p_item, p_parent );
78 playlist_SendAddNotify( p_playlist, p_item->i_id,
79 p_parent ? p_parent->i_id : -1 );
84 * Remove all the children of a node
86 * This function must be entered with the playlist lock
88 * \param p_playlist the playlist
89 * \param p_root the node
90 * \param b_delete_items do we have to delete the children items ?
91 * \return VLC_SUCCESS or an error
93 int playlist_NodeEmpty( playlist_t *p_playlist, playlist_item_t *p_root,
94 vlc_bool_t b_delete_items )
97 if( p_root->i_children == -1 )
102 /* Delete the children */
103 for( i = p_root->i_children-1 ; i >= 0 ;i-- )
105 if( p_root->pp_children[i]->i_children > -1 )
107 playlist_NodeDelete( p_playlist, p_root->pp_children[i],
108 b_delete_items , VLC_FALSE );
110 else if( b_delete_items )
112 /* Delete the item here */
113 playlist_DeleteFromItemId( p_playlist,
114 p_root->pp_children[i]->i_id );
121 * Remove all the children of a node and removes the node
123 * \param p_playlist the playlist
124 * \param p_root the node
125 * \param b_delete_items do we have to delete the children items ?
126 * \return VLC_SUCCESS or an error
128 int playlist_NodeDelete( playlist_t *p_playlist, playlist_item_t *p_root,
129 vlc_bool_t b_delete_items, vlc_bool_t b_force )
131 int i, i_top, i_bottom;
132 if( p_root->i_children == -1 )
137 /* Delete the children */
138 for( i = p_root->i_children - 1 ; i >= 0; i-- )
140 if( p_root->pp_children[i]->i_children > -1 )
142 playlist_NodeDelete( p_playlist, p_root->pp_children[i],
143 b_delete_items , b_force );
145 else if( b_delete_items )
147 playlist_DeleteFromItemId( p_playlist,
148 p_root->pp_children[i]->i_id );
151 /* Delete the node */
152 if( p_root->i_flags & PLAYLIST_RO_FLAG && !b_force )
157 var_SetInteger( p_playlist, "item-deleted", p_root->p_input->i_id );
159 i_bottom = 0; i_top = p_playlist->i_all_size - 1;
161 while( p_playlist->pp_all_items[i]->p_input->i_id !=
162 p_root->p_input->i_id && i_top > i_bottom )
164 if( p_playlist->pp_all_items[i]->p_input->i_id <
165 p_root->p_input->i_id )
173 i = i_bottom + ( i_top - i_bottom ) / 2;
175 if( p_playlist->pp_all_items[i]->p_input->i_id ==
176 p_root->p_input->i_id )
178 REMOVE_ELEM( p_playlist->pp_all_items, p_playlist->i_all_size, i );
181 /* Remove the item from its parent */
182 if( p_root->p_parent )
184 playlist_NodeRemoveItem( p_playlist, p_root, p_root->p_parent );
187 playlist_ItemDelete( p_root );
194 * Adds an item to the children of a node
196 * \param p_playlist the playlist
197 * \param p_item the item to append
198 * \param p_parent the parent node
199 * \return VLC_SUCCESS or an error
201 int playlist_NodeAppend( playlist_t *p_playlist,
202 playlist_item_t *p_item,
203 playlist_item_t *p_parent )
205 return playlist_NodeInsert( p_playlist, p_item, p_parent, -1 );
208 int playlist_NodeInsert( playlist_t *p_playlist,
209 playlist_item_t *p_item,
210 playlist_item_t *p_parent,
213 assert( p_parent && p_parent->i_children != -1 );
214 if( i_position == -1 ) i_position = p_parent->i_children ;
216 INSERT_ELEM( p_parent->pp_children,
217 p_parent->i_children,
220 p_item->p_parent = p_parent;
225 * Deletes an item from the children of a node
227 * \param p_playlist the playlist
228 * \param p_item the item to remove
229 * \param p_parent the parent node
230 * \return VLC_SUCCESS or an error
232 int playlist_NodeRemoveItem( playlist_t *p_playlist,
233 playlist_item_t *p_item,
234 playlist_item_t *p_parent )
237 for( i= 0; i< p_parent->i_children ; i++ )
239 if( p_parent->pp_children[i] == p_item )
241 REMOVE_ELEM( p_parent->pp_children, p_parent->i_children, i );
250 * Count the children of a node
252 * \param p_playlist the playlist
253 * \param p_node the node
254 * \return the number of children
256 int playlist_NodeChildrenCount( playlist_t *p_playlist, playlist_item_t*p_node)
260 if( p_node->i_children == -1 )
263 for( i=0 ; i< p_node->i_children;i++ )
265 if( p_node->pp_children[i]->i_children == -1 )
268 i_nb += playlist_NodeChildrenCount( p_playlist,
269 p_node->pp_children[i] );
275 * Search a child of a node by its name
277 * \param p_node the node
278 * \param psz_search the name of the child to search
279 * \return the child item or NULL if not found or error
281 playlist_item_t *playlist_ChildSearchName( playlist_item_t *p_node,
282 const char *psz_search )
286 if( p_node->i_children < 0 )
290 for( i = 0 ; i< p_node->i_children; i++ )
292 if( !strcmp( p_node->pp_children[i]->p_input->psz_name, psz_search ) )
294 return p_node->pp_children[i];
301 void playlist_NodesCreateForSD( playlist_t *p_playlist, char *psz_name,
302 playlist_item_t **pp_node_cat,
303 playlist_item_t **pp_node_one )
305 *pp_node_cat = playlist_NodeCreate( p_playlist, psz_name,
306 p_playlist->p_root_category );
307 (*pp_node_cat)->i_flags |= PLAYLIST_RO_FLAG;
308 (*pp_node_cat)->i_flags |= PLAYLIST_SKIP_FLAG;
310 *pp_node_one = playlist_NodeCreate( p_playlist, psz_name,
311 p_playlist->p_root_onelevel );
312 (*pp_node_one)->i_flags |= PLAYLIST_RO_FLAG;
313 (*pp_node_one)->i_flags |= PLAYLIST_SKIP_FLAG;
317 /**********************************************************************
318 * Tree walking functions
319 **********************************************************************/
321 playlist_item_t *playlist_GetLastLeaf(playlist_t *p_playlist,
322 playlist_item_t *p_root )
325 playlist_item_t *p_item;
326 for ( i = p_root->i_children - 1; i >= 0; i-- )
328 if( p_root->pp_children[i]->i_children == -1 )
329 return p_root->pp_children[i];
330 else if( p_root->pp_children[i]->i_children > 0)
332 p_item = playlist_GetLastLeaf( p_playlist,
333 p_root->pp_children[i] );
334 if ( p_item != NULL )
344 * Finds the next item to play
346 * \param p_playlist the playlist
347 * \param p_root the root node
348 * \param p_item the previous item (NULL if none )
349 * \return the next item to play, or NULL if none found
351 playlist_item_t *playlist_GetNextLeaf( playlist_t *p_playlist,
352 playlist_item_t *p_root,
353 playlist_item_t *p_item )
355 playlist_item_t *p_next;
357 #ifdef PLAYLIST_DEBUG
359 msg_Dbg( p_playlist, "finding next of %s within %s",
360 p_item->p_input->psz_name, p_root->p_input->psz_name );
362 msg_Dbg( p_playlist, "finding something to play within %s",
363 p_root->p_input->psz_name );
366 assert( p_root && p_root->i_children != -1 );
368 /* Now, walk the tree until we find a suitable next item */
372 p_next = GetNextItem( p_playlist, p_root, p_next );
373 } while ( p_next && p_next != p_root && p_next->i_children != -1 );
375 #ifdef PLAYLIST_DEBUG
377 msg_Dbg( p_playlist, "At end of node" );
382 playlist_item_t *playlist_GetNextEnabledLeaf( playlist_t *p_playlist,
383 playlist_item_t *p_root,
384 playlist_item_t *p_item )
386 playlist_item_t *p_next;
388 #ifdef PLAYLIST_DEBUG
390 msg_Dbg( p_playlist, "finding next of %s within %s",
391 p_item->p_input->psz_name, p_root->p_input->psz_name );
393 msg_Dbg( p_playlist, "finding something to play within %s",
394 p_root->p_input->psz_name );
397 assert( p_root && p_root->i_children != -1 );
399 /* Now, walk the tree until we find a suitable next item */
403 p_next = GetNextItem( p_playlist, p_root, p_next );
404 } while ( p_next && p_next != p_root &&
405 !( p_next->i_children == -1 &&
406 !(p_next->i_flags & PLAYLIST_DBL_FLAG) ) );
408 #ifdef PLAYLIST_DEBUG
410 msg_Dbg( p_playlist, "At end of node" );
416 * Finds the previous item to play
418 * \param p_playlist the playlist
419 * \param p_root the root node
420 * \param p_item the previous item (NULL if none )
421 * \return the next item to play, or NULL if none found
423 playlist_item_t *playlist_GetPrevLeaf( playlist_t *p_playlist,
424 playlist_item_t *p_root,
425 playlist_item_t *p_item )
427 playlist_item_t *p_prev;
429 #ifdef PLAYLIST_DEBUG
431 msg_Dbg( p_playlist, "finding previous of %s within %s",
432 p_item->p_input->psz_name, p_root->p_input->psz_name );
434 msg_Dbg( p_playlist, "finding previous to play within %s",
435 p_root->p_input->psz_name );
437 assert( p_root && p_root->i_children != -1 );
439 /* Now, walk the tree until we find a suitable previous item */
443 p_prev = GetPrevItem( p_playlist, p_root, p_prev );
444 } while ( p_prev && p_prev != p_root && p_prev->i_children != -1 );
446 #ifdef PLAYLIST_DEBUG
448 msg_Dbg( p_playlist, "At beginning of node" );
453 /************************************************************************
454 * Following functions are local
455 ***********************************************************************/
458 * Get the next item in the tree
459 * If p_item is NULL, return the first child of root
461 playlist_item_t *GetNextItem( playlist_t *p_playlist,
462 playlist_item_t *p_root,
463 playlist_item_t *p_item )
465 playlist_item_t *p_parent;
468 /* Node with children, get the first one */
469 if( p_item && p_item->i_children > 0 )
470 return p_item->pp_children[0];
473 p_parent = p_item->p_parent;
477 for( i= 0 ; i < p_parent->i_children ; i++ )
479 if( p_item == NULL || p_parent->pp_children[i] == p_item )
484 if( i+1 >= p_parent->i_children )
486 /* Was already the last sibling. Look for uncles */
487 PL_DEBUG( "Current item is the last of the node,"
488 "looking for uncle from %s",
489 p_parent->p_input->psz_name );
491 if( p_parent == p_root )
493 PL_DEBUG( "already at root" );
496 return GetNextUncle( p_playlist, p_item, p_root );
500 return p_parent->pp_children[i+1];
504 msg_Err( p_playlist, "I should not be here" );
508 playlist_item_t *GetNextUncle( playlist_t *p_playlist, playlist_item_t *p_item,
509 playlist_item_t *p_root )
511 playlist_item_t *p_parent = p_item->p_parent;
512 playlist_item_t *p_grandparent;
513 vlc_bool_t b_found = VLC_FALSE;
515 if( p_parent != NULL )
517 p_grandparent = p_parent->p_parent;
521 for( i = 0 ; i< p_grandparent->i_children ; i++ )
523 if( p_parent == p_grandparent->pp_children[i] )
525 PL_DEBUG( "parent %s found as child %i of grandparent %s",
526 p_parent->p_input->psz_name, i,
527 p_grandparent->p_input->psz_name );
532 if( b_found && i + 1 < p_grandparent->i_children )
534 return p_grandparent->pp_children[i+1];
536 /* Not found at root */
537 if( p_grandparent == p_root )
543 p_parent = p_grandparent;
544 p_grandparent = p_parent->p_parent;
548 /* We reached root */
552 playlist_item_t *GetPrevUncle( playlist_t *p_playlist, playlist_item_t *p_item,
553 playlist_item_t *p_root )
555 playlist_item_t *p_parent = p_item->p_parent;
556 playlist_item_t *p_grandparent;
557 vlc_bool_t b_found = VLC_FALSE;
559 if( p_parent != NULL )
561 p_grandparent = p_parent->p_parent;
565 for( i = p_grandparent->i_children -1 ; i >= 0; i-- )
567 if( p_parent == p_grandparent->pp_children[i] )
573 if( b_found && i - 1 > 0 )
575 return p_grandparent->pp_children[i-1];
577 /* Not found at root */
578 if( p_grandparent == p_root )
584 p_parent = p_grandparent;
585 p_grandparent = p_parent->p_parent;
589 /* We reached root */
594 /* Recursively search the tree for previous item */
595 playlist_item_t *GetPrevItem( playlist_t *p_playlist,
596 playlist_item_t *p_root,
597 playlist_item_t *p_item )
599 playlist_item_t *p_parent;
602 /* Node with children, get the last one */
603 if( p_item && p_item->i_children > 0 )
604 return p_item->pp_children[p_item->i_children - 1];
606 /* Last child of its parent ? */
608 p_parent = p_item->p_parent;
611 msg_Err( p_playlist, "Get the last one" );
615 for( i = p_parent->i_children -1 ; i >= 0 ; i-- )
617 if( p_parent->pp_children[i] == p_item )
621 /* Was already the first sibling. Look for uncles */
622 PL_DEBUG( "Current item is the first of the node,"
623 "looking for uncle from %s",
624 p_parent->p_input->psz_name );
625 return GetPrevUncle( p_playlist, p_item, p_root );
629 return p_parent->pp_children[i-1];
633 msg_Err( p_playlist, "I should not be here" );
637 /* Dump the contents of a node */
638 void playlist_NodeDump( playlist_t *p_playlist, playlist_item_t *p_item,
646 msg_Dbg( p_playlist, "%s (%i)",
647 p_item->p_input->psz_name, p_item->i_children );
650 if( p_item->i_children == -1 )
655 for( i = 0; i< p_item->i_children; i++ )
657 memset( str, 32, 512 );
658 sprintf( str + 2 * i_level , "%s (%i)",
659 p_item->pp_children[i]->p_input->psz_name,
660 p_item->pp_children[i]->i_children );
661 msg_Dbg( p_playlist, "%s",str );
662 if( p_item->pp_children[i]->i_children >= 0 )
664 playlist_NodeDump( p_playlist, p_item->pp_children[i],