git.sesse.net Git - vlc/blob - src/playlist/sort.c

   1 /*****************************************************************************
   2  * sort.c : Playlist sorting functions
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 VideoLAN
   5  * $Id: sort.c,v 1.2 2003/11/26 10:45:21 zorglub Exp $
   6  *
   7  * Authors: Clément Stenac <zorglub@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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23 #include <stdlib.h>                                      /* free(), strtol() */
  24 #include <stdio.h>                                              /* sprintf() */
  25 #include <string.h>                                            /* strerror() */
  26
  27 #include <vlc/vlc.h>
  28 #include <vlc/vout.h>
  29 #include <vlc/sout.h>
  30
  31 #include "vlc_playlist.h"
  32
  33 /**
  34  * Sort the playlist
  35  * \param p_playlist the playlist
  36  * \param i_mode: SORT_TITLE, SORT_GROUP, SORT_AUTHOR, SORT_RANDOM
  37  * \param i_type: SORT_NORMAL or SORT_REVERSE (reversed order)
  38  * \return 0 on success
  39  */
  40 int playlist_Sort( playlist_t * p_playlist , int i_mode, int i_type )
  41 {
  42     int i , i_small , i_position;
  43     playlist_item_t *p_temp;
  44
  45     vlc_mutex_lock( &p_playlist->object_lock );
  46
  47     if( i_mode == SORT_RANDOM )
  48     {
  49         for( i_position = 0; i_position < p_playlist->i_size ; i_position ++ )
  50         {
  51             int i_new  = rand() % (p_playlist->i_size - 1);
  52
  53             /* Keep the correct current index */
  54             if( i_new == p_playlist->i_index )
  55                 p_playlist->i_index = i_position;
  56             else if( i_position == p_playlist->i_index )
  57                 p_playlist->i_index = i_new;
  58
  59             p_temp = p_playlist->pp_items[i_position];
  60             p_playlist->pp_items[i_position] = p_playlist->pp_items[i_new];
  61             p_playlist->pp_items[i_new] = p_temp;
  62         }
  63         vlc_mutex_unlock( &p_playlist->object_lock );
  64
  65         return 0;
  66     }
  67
  68     for( i_position = 0; i_position < p_playlist->i_size -1 ; i_position ++ )
  69     {
  70         i_small  = i_position;
  71         for( i = i_position + 1 ; i<  p_playlist->i_size ; i++)
  72         {
  73             int i_test = 0;
  74
  75             if( i_mode == SORT_TITLE )
  76             {
  77                 i_test = strcasecmp( p_playlist->pp_items[i]->psz_name,
  78                                  p_playlist->pp_items[i_small]->psz_name );
  79             }
  80             else if( i_mode == SORT_GROUP )
  81             {
  82                 i_test = p_playlist->pp_items[i]->i_group -
  83                                  p_playlist->pp_items[i_small]->i_group;
  84             }
  85             else if( i_mode == SORT_AUTHOR )
  86             {
  87                  i_test = strcasecmp( p_playlist->pp_items[i]->psz_author,
  88                                  p_playlist->pp_items[i_small]->psz_author );
  89             }
  90
  91             if( ( i_type == SORT_NORMAL  && i_test < 0 ) ||
  92                 ( i_type == SORT_REVERSE && i_test > 0 ) )
  93             {
  94                 i_small = i;
  95             }
  96         }
  97         /* Keep the correct current index */
  98         if( i_small == p_playlist->i_index )
  99             p_playlist->i_index = i_position;
 100         else if( i_position == p_playlist->i_index )
 101             p_playlist->i_index = i_small;
 102
 103         p_temp = p_playlist->pp_items[i_position];
 104         p_playlist->pp_items[i_position] = p_playlist->pp_items[i_small];
 105         p_playlist->pp_items[i_small] = p_temp;
 106     }
 107     vlc_mutex_unlock( &p_playlist->object_lock );
 108
 109     return 0;
 110 }