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

   1 /*****************************************************************************
   2  * control.c : Handle control of the playlist & running through it
   3  *****************************************************************************
   4  * Copyright (C) 1999-2004 the VideoLAN team
   5  * $Id: /local/vlc/0.8.6-playlist-vlm/src/playlist/playlist.c 13741 2006-03-21T19:29:39.792444Z zorglub  $
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *          Clément Stenac <zorglub@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24 #include <vlc/vlc.h>
  25 #include <vlc/input.h>
  26 #include "vlc_playlist.h"
  27 #include "playlist_internal.h"
  28 #include <assert.h>
  29
  30 /*****************************************************************************
  31  * Local prototypes
  32  *****************************************************************************/
  33 int PlaylistVAControl( playlist_t * p_playlist, int i_query, va_list args );
  34
  35 void PreparseEnqueueItemSub( playlist_t *, playlist_item_t * );
  36
  37 playlist_item_t *playlist_RecursiveFindLast(playlist_t *p_playlist,
  38                                             playlist_item_t *p_node );
  39
  40 /*****************************************************************************
  41  * Playlist control
  42  *****************************************************************************/
  43
  44 /**
  45  * Do a playlist action. Should be entered without playlist lock
  46  * \see playlist_Control
  47  */
  48 int playlist_LockControl( playlist_t * p_playlist, int i_query, ... )
  49 {
  50     va_list args;
  51     int i_result;
  52     va_start( args, i_query );
  53     vlc_mutex_lock( &p_playlist->object_lock );
  54     i_result = PlaylistVAControl( p_playlist, i_query, args );
  55     va_end( args );
  56     vlc_mutex_unlock( &p_playlist->object_lock );
  57     return i_result;
  58 }
  59
  60 /**
  61  * Do a playlist action.
  62  * If there is something in the playlist then you can do playlist actions.
  63  * Should be entered with playlist lock. See include/vlc_playlist.h for
  64  * possible queries
  65  *
  66  * \param p_playlist the playlist to do the command on
  67  * \param i_query the command to do
  68  * \param variable number of arguments
  69  * \return VLC_SUCCESS or an error
  70  */
  71 int playlist_Control( playlist_t * p_playlist, int i_query, ... )
  72 {
  73     va_list args;
  74     int i_result;
  75     va_start( args, i_query );
  76     i_result = PlaylistVAControl( p_playlist, i_query, args );
  77     va_end( args );
  78
  79     return i_result;
  80 }
  81
  82 int PlaylistVAControl( playlist_t * p_playlist, int i_query, va_list args )
  83 {
  84     playlist_item_t *p_item, *p_node;
  85     vlc_value_t val;
  86
  87     if( p_playlist->i_size <= 0 )
  88     {
  89         return VLC_EGENERIC;
  90     }
  91
  92     switch( i_query )
  93     {
  94     case PLAYLIST_STOP:
  95         p_playlist->request.i_status = PLAYLIST_STOPPED;
  96         p_playlist->request.b_request = VLC_TRUE;
  97         p_playlist->request.p_item = NULL;
  98         break;
  99
 100     // Node can be null, it will keep the same. Use with care ...
 101     // Item null = take the first child of node
 102     case PLAYLIST_VIEWPLAY:
 103         p_playlist->b_reset_random = VLC_TRUE;
 104         p_node = (playlist_item_t *)va_arg( args, playlist_item_t * );
 105         p_item = (playlist_item_t *)va_arg( args, playlist_item_t * );
 106         if ( p_node == NULL )
 107         {
 108             p_node = p_playlist->status.p_node;
 109             assert( p_node );
 110         }
 111         p_playlist->request.i_status = PLAYLIST_RUNNING;
 112         p_playlist->request.i_skip = 0;
 113         p_playlist->request.b_request = VLC_TRUE;
 114         p_playlist->request.p_node = p_node;
 115         p_playlist->request.p_item = p_item;
 116         break;
 117
 118     case PLAYLIST_PLAY:
 119         if( p_playlist->p_input )
 120         {
 121             val.i_int = PLAYING_S;
 122             var_Set( p_playlist->p_input, "state", val );
 123             break;
 124         }
 125         else
 126         {
 127             p_playlist->request.i_status = PLAYLIST_RUNNING;
 128             p_playlist->request.b_request = VLC_TRUE;
 129             p_playlist->request.p_node = p_playlist->status.p_node;
 130             p_playlist->request.p_item = p_playlist->status.p_item;
 131             p_playlist->request.i_skip = 0;
 132         }
 133         break;
 134
 135     case PLAYLIST_AUTOPLAY:
 136         // AUTOPLAY is an ugly hack for initial status.
 137         // Hopefully it will disappear
 138         p_playlist->status.i_status = PLAYLIST_RUNNING;
 139         p_playlist->request.p_node = p_playlist->status.p_node;
 140         p_playlist->request.b_request = VLC_FALSE;
 141         break;
 142
 143     case PLAYLIST_PAUSE:
 144         val.i_int = 0;
 145         if( p_playlist->p_input )
 146             var_Get( p_playlist->p_input, "state", &val );
 147
 148         if( val.i_int == PAUSE_S )
 149         {
 150             p_playlist->status.i_status = PLAYLIST_RUNNING;
 151             if( p_playlist->p_input )
 152             {
 153                 val.i_int = PLAYING_S;
 154                 var_Set( p_playlist->p_input, "state", val );
 155             }
 156         }
 157         else
 158         {
 159             p_playlist->status.i_status = PLAYLIST_PAUSED;
 160             if( p_playlist->p_input )
 161             {
 162                 val.i_int = PAUSE_S;
 163                 var_Set( p_playlist->p_input, "state", val );
 164             }
 165         }
 166         break;
 167
 168     case PLAYLIST_SKIP:
 169         p_playlist->request.p_node = p_playlist->status.p_node;
 170         p_playlist->request.p_item = p_playlist->status.p_item;
 171         p_playlist->request.i_skip = (int) va_arg( args, int );
 172         /* if already running, keep running */
 173         if( p_playlist->status.i_status != PLAYLIST_STOPPED )
 174             p_playlist->request.i_status = p_playlist->status.i_status;
 175         p_playlist->request.b_request = VLC_TRUE;
 176         break;
 177
 178     default:
 179         msg_Err( p_playlist, "unknown playlist query" );
 180         return VLC_EBADVAR;
 181         break;
 182     }
 183
 184     return VLC_SUCCESS;
 185 }
 186
 187 /*****************************************************************************
 188  * Preparse control
 189  *****************************************************************************/
 190 /** Enqueue an item for preparsing */
 191 int playlist_PreparseEnqueue( playlist_t *p_playlist,
 192                               input_item_t *p_item )
 193 {
 194     vlc_mutex_lock( &p_playlist->p_preparse->object_lock );
 195     vlc_gc_incref( p_item );
 196     INSERT_ELEM( p_playlist->p_preparse->pp_waiting,
 197                  p_playlist->p_preparse->i_waiting,
 198                  p_playlist->p_preparse->i_waiting,
 199                  p_item );
 200     vlc_mutex_unlock( &p_playlist->p_preparse->object_lock );
 201     vlc_cond_signal( &p_playlist->p_preparse->object_wait );
 202     return VLC_SUCCESS;
 203 }
 204
 205 /** Enqueue a playlist item or a node for peparsing.
 206  *  This function should be entered without playlist and preparser locks */
 207 int playlist_PreparseEnqueueItem( playlist_t *p_playlist,
 208                                   playlist_item_t *p_item )
 209 {
 210     vlc_mutex_lock( &p_playlist->object_lock );
 211     vlc_mutex_lock( &p_playlist->p_preparse->object_lock );
 212     PreparseEnqueueItemSub( p_playlist, p_item );
 213     vlc_mutex_unlock( &p_playlist->p_preparse->object_lock );
 214     vlc_mutex_unlock( &p_playlist->object_lock );
 215     return VLC_SUCCESS;
 216 }
 217
 218 int playlist_AskForArtEnqueue( playlist_t *p_playlist,
 219                               input_item_t *p_item )
 220 {
 221     int i;
 222     preparse_item_t p;
 223     p.p_item = p_item;
 224     p.b_fetch_art = VLC_TRUE;
 225
 226     vlc_mutex_lock( &p_playlist->p_secondary_preparse->object_lock );
 227     for( i = 0; i < p_playlist->p_secondary_preparse->i_waiting &&
 228          p_playlist->p_secondary_preparse->p_waiting->b_fetch_art == VLC_TRUE;
 229          i++ );
 230     vlc_gc_incref( p_item );
 231     INSERT_ELEM( p_playlist->p_secondary_preparse->p_waiting,
 232                  p_playlist->p_secondary_preparse->i_waiting,
 233                  i, p );
 234     vlc_mutex_unlock( &p_playlist->p_secondary_preparse->object_lock );
 235     vlc_cond_signal( &p_playlist->p_secondary_preparse->object_wait );
 236     return VLC_SUCCESS;
 237 }
 238
 239 void PreparseEnqueueItemSub( playlist_t *p_playlist,
 240                              playlist_item_t *p_item )
 241 {
 242     int i;
 243     if( p_item->i_children == -1 )
 244     {
 245         vlc_gc_incref( p_item );
 246         INSERT_ELEM( p_playlist->p_preparse->pp_waiting,
 247                      p_playlist->p_preparse->i_waiting,
 248                      p_playlist->p_preparse->i_waiting,
 249                      p_item->p_input );
 250     }
 251     else
 252     {
 253         for( i = 0; i < p_item->i_children; i++)
 254         {
 255             PreparseEnqueueItemSub( p_playlist, p_item->pp_children[i] );
 256         }
 257     }
 258 }
 259
 260 /*****************************************************************************
 261  * Playback logic
 262  *****************************************************************************/
 263
 264 /** This function calculates the next playlist item, depending
 265  *  on the playlist course mode (forward, backward, random, view,...). */
 266 playlist_item_t * playlist_NextItem( playlist_t *p_playlist )
 267 {
 268     playlist_item_t *p_new = NULL;
 269     int i_skip = 0, i;
 270
 271     vlc_bool_t b_loop = var_GetBool( p_playlist, "loop" );
 272     vlc_bool_t b_random = var_GetBool( p_playlist, "random" );
 273     vlc_bool_t b_repeat = var_GetBool( p_playlist, "repeat" );
 274     vlc_bool_t b_playstop = var_GetBool( p_playlist, "play-and-stop" );
 275
 276     /* Handle quickly a few special cases */
 277     /* No items to play */
 278     if( p_playlist->i_size == 0 )
 279     {
 280         msg_Info( p_playlist, "playlist is empty" );
 281         return NULL;
 282     }
 283
 284     /* Repeat and play/stop */
 285     if( !p_playlist->request.b_request && b_repeat == VLC_TRUE &&
 286          p_playlist->status.p_item )
 287     {
 288         msg_Dbg( p_playlist,"repeating item" );
 289         return p_playlist->status.p_item;
 290     }
 291     if( !p_playlist->request.b_request && b_playstop == VLC_TRUE )
 292     {
 293         msg_Dbg( p_playlist,"stopping (play and stop)");
 294         return NULL;
 295     }
 296
 297     if( !p_playlist->request.b_request && p_playlist->status.p_item )
 298     {
 299         playlist_item_t *p_parent = p_playlist->status.p_item;
 300         while( p_parent )
 301         {
 302             if( p_parent->i_flags & PLAYLIST_SKIP_FLAG )
 303             {
 304                 msg_Dbg( p_playlist, "blocking item, stopping") ;
 305                 return NULL;
 306             }
 307             p_parent = p_parent->p_parent;
 308         }
 309     }
 310
 311     /* Random case. This is an exception: if request, but request is skip +- 1
 312      * we don't go to next item but select a new random one. */
 313     if( b_random &&
 314         ( !p_playlist->request.b_request ||
 315         ( p_playlist->request.b_request &&
 316             ( p_playlist->request.p_item == NULL ||
 317               p_playlist->request.i_skip == 1    ||
 318               p_playlist->request.i_skip == -1 ) ) ) )
 319     {
 320        PL_DEBUG( "doing random, have %i items, currently at %i, reset %i\n",
 321                         p_playlist->i_random, p_playlist->i_random_index,
 322                         p_playlist->b_reset_random );
 323        if( p_playlist->b_reset_random )
 324         {
 325             int j;
 326             FREE( p_playlist->pp_random );
 327             if( !p_playlist->b_reset_random &&  !b_loop ) goto end;
 328             p_playlist->i_random = 0;
 329             p_playlist->i_random_index = 0;
 330             p_playlist->i_random = playlist_GetAllEnabledChildren(
 331                                                 p_playlist,
 332                                                 p_playlist->status.p_node,
 333                                                 &p_playlist->pp_random );
 334             /* Shuffle the array */
 335             srand( (unsigned int)mdate() );
 336             int swap = 0;
 337             for( j = p_playlist->i_random -1; j > 0; j-- )
 338             {
 339                 swap++;
 340                 int i = rand() % (j+1); /* between 0 and j */
 341                 playlist_item_t *p_tmp;
 342                 p_tmp = p_playlist->pp_random[i];
 343                 p_playlist->pp_random[i] = p_playlist->pp_random[j];
 344                 p_playlist->pp_random[j] = p_tmp;
 345             }
 346             p_playlist->b_reset_random = VLC_FALSE;
 347             PL_DEBUG( "random rebuilt, have %i items", p_playlist->i_random );
 348         }
 349         else
 350         {
 351             /* Go backward or forward */
 352             if( !p_playlist->request.b_request || !p_playlist->request.p_item ||
 353                                                p_playlist->request.i_skip == 1 )
 354                 p_playlist->i_random_index++;
 355             else
 356                 p_playlist->i_random_index--;
 357             /* Handle bounds situations */
 358             if( p_playlist->i_random_index == -1 )
 359             {
 360                 if( !b_loop || p_playlist->i_random == 0 ) goto end;
 361                 p_playlist->i_random_index = p_playlist->i_random - 1;
 362             }
 363             else if( p_playlist->i_random_index == p_playlist->i_random )
 364             {
 365                 if( !b_loop || p_playlist->i_random == 0 ) goto end;
 366                 p_playlist->i_random_index = 0;
 367             }
 368         }
 369         PL_DEBUG( "using random item %i", p_playlist->i_random_index );
 370         if ( p_playlist->i_random == 0 ) goto end; /* Can this happen ?? */
 371         p_new = p_playlist->pp_random[p_playlist->i_random_index];
 372 end:
 373         if( !p_new ) p_playlist->b_reset_random = VLC_TRUE;
 374         p_playlist->request.i_skip = 0;
 375         p_playlist->request.b_request = VLC_FALSE;
 376         return p_new;
 377     }
 378
 379     /* Start the real work */
 380     if( p_playlist->request.b_request )
 381     {
 382         p_new = p_playlist->request.p_item;
 383         i_skip = p_playlist->request.i_skip;
 384         PL_DEBUG( "processing request item %s node %s skip %i",
 385                         PLI_NAME( p_playlist->request.p_item ),
 386                         PLI_NAME( p_playlist->request.p_node ), i_skip );
 387
 388         if( p_playlist->request.p_node )
 389             p_playlist->status.p_node = p_playlist->request.p_node;
 390
 391         /* If we are asked for a node, dont take it */
 392         if( i_skip == 0 && ( p_new == NULL || p_new->i_children != -1 ) )
 393             i_skip++;
 394
 395         if( i_skip > 0 )
 396         {
 397             for( i = i_skip; i > 0 ; i-- )
 398             {
 399                 p_new = playlist_GetNextLeaf( p_playlist,
 400                                               p_playlist->request.p_node,
 401                                               p_new, VLC_TRUE, VLC_FALSE );
 402                 if( p_new == NULL )
 403                 {
 404                     PL_DEBUG( "looping - restarting at beginning of node" );
 405                     p_new = playlist_GetNextLeaf( p_playlist,
 406                                                   p_playlist->request.p_node,
 407                                                   NULL, VLC_TRUE, VLC_FALSE);
 408                     if( p_new == NULL ) break;
 409                 }
 410             }
 411         }
 412         else if( i_skip < 0 )
 413         {
 414             for( i = i_skip; i < 0 ; i++ )
 415             {
 416                 p_new = playlist_GetPrevLeaf( p_playlist,
 417                                               p_playlist->request.p_node,
 418                                               p_new, VLC_FALSE, VLC_FALSE );
 419                 if( p_new == NULL )
 420                 {
 421                     PL_DEBUG( "looping - restarting at end of node" );
 422                     /** \bug This is needed because GetPrevLeaf does not loop
 423                       * by itself */
 424                     p_new = playlist_GetLastLeaf( p_playlist,
 425                                                  p_playlist->request.p_node );
 426                 }
 427                 if( p_new == NULL ) break;
 428             }
 429         }
 430         /* Clear the request */
 431         p_playlist->request.b_request = VLC_FALSE;
 432     }
 433     /* "Automatic" item change ( next ) */
 434     else
 435     {
 436         PL_DEBUG( "changing item without a request" );
 437         /* Cant go to next from current item */
 438         if( p_playlist->status.p_item &&
 439             p_playlist->status.p_item->i_flags & PLAYLIST_SKIP_FLAG )
 440             return NULL;
 441
 442         p_new = playlist_GetNextLeaf( p_playlist,
 443                                       p_playlist->status.p_node,
 444                                       p_playlist->status.p_item,
 445                                       VLC_TRUE, VLC_FALSE );
 446         if( p_new == NULL && b_loop )
 447         {
 448             PL_DEBUG( "looping" );
 449             p_new = playlist_GetNextLeaf( p_playlist,
 450                                           p_playlist->status.p_node,
 451                                           NULL, VLC_TRUE, VLC_FALSE );
 452         }
 453         /* The new item can't be autoselected  */
 454         if( p_new != NULL && p_new->i_flags & PLAYLIST_SKIP_FLAG )
 455             return NULL;
 456     }
 457     if( p_new == NULL )
 458     {
 459         msg_Dbg( p_playlist, "did not find something to play" );
 460     }
 461     return p_new;
 462 }
 463
 464 /** Start the input for an item */
 465 int playlist_PlayItem( playlist_t *p_playlist, playlist_item_t *p_item )
 466 {
 467     vlc_value_t val;
 468     int i_activity = var_GetInteger( p_playlist, "activity") ;
 469
 470     msg_Dbg( p_playlist, "creating new input thread" );
 471
 472     p_item->p_input->i_nb_played++;
 473     p_playlist->status.p_item = p_item;
 474
 475     p_playlist->status.i_status = PLAYLIST_RUNNING;
 476
 477     var_SetInteger( p_playlist, "activity", i_activity +
 478                     DEFAULT_INPUT_ACTIVITY );
 479     p_playlist->p_input = input_CreateThread( p_playlist, p_item->p_input );
 480
 481     val.i_int = p_item->p_input->i_id;
 482     /* unlock the playlist to set the var...mmm */
 483     vlc_mutex_unlock( &p_playlist->object_lock);
 484     var_Set( p_playlist, "playlist-current", val);
 485     vlc_mutex_lock( &p_playlist->object_lock);
 486
 487     return VLC_SUCCESS;
 488 }