control.c 18.8 KB
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/*****************************************************************************
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 * control.c : Handle control of the playlist & running through it
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 *****************************************************************************
 * Copyright (C) 1999-2004 the VideoLAN team
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 * $Id$
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 *
 * Authors: Samuel Hocevar <sam@zoy.org>
 *          Clément Stenac <zorglub@videolan.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/
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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

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#include <vlc_common.h>
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#include "vlc_playlist.h"
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#include "playlist_internal.h"
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#include <assert.h>
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/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
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static int PlaylistVAControl( playlist_t * p_playlist, int i_query, va_list args );
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static void PreparseEnqueueItemSub( playlist_t *, playlist_item_t * );
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/*****************************************************************************
 * Playlist control
 *****************************************************************************/

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playlist_t *__pl_Hold( vlc_object_t *p_this )
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{
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    playlist_t *pl;
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    barrier ();
    pl = libvlc_priv (p_this->p_libvlc)->p_playlist;
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    assert( VLC_OBJECT(pl) != p_this /* This does not make sense to hold the playlist
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    using pl_Hold. use vlc_object_hold in this case */ );
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    if (pl)
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        vlc_object_hold (pl);
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    return pl;
}

void __pl_Release( vlc_object_t *p_this )
{
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    playlist_t *pl = libvlc_priv (p_this->p_libvlc)->p_playlist;
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    assert( pl != NULL );
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    assert( VLC_OBJECT(pl) != p_this /* The rule is that pl_Release() should act on
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    the same object than pl_Hold() */ );
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    vlc_object_release( pl );
}

int playlist_Control( playlist_t * p_playlist, int i_query,
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                      bool b_locked, ... )
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{
    va_list args;
    int i_result;
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    va_start( args, b_locked );
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    PL_LOCK_IF( !b_locked );
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    i_result = PlaylistVAControl( p_playlist, i_query, args );
    va_end( args );
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    PL_UNLOCK_IF( !b_locked );
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    return i_result;
}

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static int PlaylistVAControl( playlist_t * p_playlist, int i_query, va_list args )
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{
    playlist_item_t *p_item, *p_node;
    vlc_value_t val;

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    PL_ASSERT_LOCKED;

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    if( !vlc_object_alive( p_playlist ) )
        return VLC_EGENERIC;

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    if( playlist_IsEmpty( p_playlist ) )
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        return VLC_EGENERIC;

    switch( i_query )
    {
    case PLAYLIST_STOP:
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        pl_priv(p_playlist)->request.i_status = PLAYLIST_STOPPED;
        pl_priv(p_playlist)->request.b_request = true;
        pl_priv(p_playlist)->request.p_item = NULL;
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        break;

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    // Node can be null, it will keep the same. Use with care ...
    // Item null = take the first child of node
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    case PLAYLIST_VIEWPLAY:
        p_node = (playlist_item_t *)va_arg( args, playlist_item_t * );
        p_item = (playlist_item_t *)va_arg( args, playlist_item_t * );
        if ( p_node == NULL )
        {
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            p_node = get_current_status_node( p_playlist );
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            assert( p_node );
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        }
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        pl_priv(p_playlist)->request.i_status = PLAYLIST_RUNNING;
        pl_priv(p_playlist)->request.i_skip = 0;
        pl_priv(p_playlist)->request.b_request = true;
        pl_priv(p_playlist)->request.p_node = p_node;
        pl_priv(p_playlist)->request.p_item = p_item;
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        if( p_item && var_GetBool( p_playlist, "random" ) )
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            p_playlist->b_reset_currently_playing = true;
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        break;

    case PLAYLIST_PLAY:
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        if( pl_priv(p_playlist)->p_input )
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        {
            val.i_int = PLAYING_S;
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            var_Set( pl_priv(p_playlist)->p_input, "state", val );
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            break;
        }
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        else
        {
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            pl_priv(p_playlist)->request.i_status = PLAYLIST_RUNNING;
            pl_priv(p_playlist)->request.b_request = true;
            pl_priv(p_playlist)->request.p_node = get_current_status_node( p_playlist );
            pl_priv(p_playlist)->request.p_item = get_current_status_item( p_playlist );
            pl_priv(p_playlist)->request.i_skip = 0;
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        }
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        break;

    case PLAYLIST_PAUSE:
        val.i_int = 0;
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        if( pl_priv(p_playlist)->p_input )
            var_Get( pl_priv(p_playlist)->p_input, "state", &val );
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        if( val.i_int == PAUSE_S )
        {
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            pl_priv(p_playlist)->status.i_status = PLAYLIST_RUNNING;
            if( pl_priv(p_playlist)->p_input )
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            {
                val.i_int = PLAYING_S;
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                var_Set( pl_priv(p_playlist)->p_input, "state", val );
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            }
        }
        else
        {
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            pl_priv(p_playlist)->status.i_status = PLAYLIST_PAUSED;
            if( pl_priv(p_playlist)->p_input )
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            {
                val.i_int = PAUSE_S;
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                var_Set( pl_priv(p_playlist)->p_input, "state", val );
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            }
        }
        break;

    case PLAYLIST_SKIP:
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        pl_priv(p_playlist)->request.p_node = get_current_status_node( p_playlist );
        pl_priv(p_playlist)->request.p_item = get_current_status_item( p_playlist );
        pl_priv(p_playlist)->request.i_skip = (int) va_arg( args, int );
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        /* if already running, keep running */
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        if( pl_priv(p_playlist)->status.i_status != PLAYLIST_STOPPED )
            pl_priv(p_playlist)->request.i_status = pl_priv(p_playlist)->status.i_status;
        pl_priv(p_playlist)->request.b_request = true;
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        break;

    default:
        msg_Err( p_playlist, "unknown playlist query" );
        return VLC_EBADVAR;
    }
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    vlc_object_signal_unlocked( p_playlist );
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    return VLC_SUCCESS;
}

/*****************************************************************************
 * Preparse control
 *****************************************************************************/
/** Enqueue an item for preparsing */
int playlist_PreparseEnqueue( playlist_t *p_playlist,
                              input_item_t *p_item )
{
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    playlist_preparse_t *p_preparse = &pl_priv(p_playlist)->preparse;
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    vlc_gc_incref( p_item );
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    vlc_mutex_lock( &p_preparse->lock );
    INSERT_ELEM( p_preparse->pp_waiting, p_preparse->i_waiting,
                 p_preparse->i_waiting, p_item );
    vlc_cond_signal( &p_preparse->wait );
    vlc_mutex_unlock( &p_preparse->lock );
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    return VLC_SUCCESS;
}

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/** Enqueue a playlist item or a node for preparsing.
 *  This function shall be called without playlist and preparser locks */
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int playlist_PreparseEnqueueItem( playlist_t *p_playlist,
                                  playlist_item_t *p_item )
{
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    playlist_preparse_t *p_preparse = &pl_priv(p_playlist)->preparse;
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    vlc_object_lock( p_playlist );
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    vlc_mutex_lock( &p_preparse->lock );
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    PreparseEnqueueItemSub( p_playlist, p_item );
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    vlc_mutex_unlock( &p_preparse->lock );
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    vlc_object_unlock( p_playlist );
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    return VLC_SUCCESS;
}

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int playlist_AskForArtEnqueue( playlist_t *p_playlist,
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                               input_item_t *p_item )
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{
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    playlist_fetcher_t *p_fetcher = &pl_priv(p_playlist)->fetcher;
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    vlc_gc_incref( p_item );
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    vlc_mutex_lock( &p_fetcher->lock );
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    INSERT_ELEM( p_fetcher->pp_waiting, p_fetcher->i_waiting,
                 p_fetcher->i_waiting, p_item );
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    vlc_cond_signal( &p_fetcher->wait );
    vlc_mutex_unlock( &p_fetcher->lock );
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    return VLC_SUCCESS;
}

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static void PreparseEnqueueItemSub( playlist_t *p_playlist,
                                    playlist_item_t *p_item )
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{
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    playlist_preparse_t *p_preparse = &pl_priv(p_playlist)->preparse;
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    if( p_item->i_children == -1 )
    {
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        /* Leaf item */
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        vlc_gc_incref( p_item->p_input );
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        INSERT_ELEM( p_preparse->pp_waiting,
                     p_preparse->i_waiting,
                     p_preparse->i_waiting,
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                     p_item->p_input );
    }
    else
    {
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        /* Non-leaf item: recurse */
        for( int i = 0; i < p_item->i_children; i++)
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        {
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            PreparseEnqueueItemSub( p_playlist, p_item->pp_children[i] );
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        }
    }
}

/*****************************************************************************
 * Playback logic
 *****************************************************************************/

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/**
 * Synchronise the current index of the playlist
 * to match the index of the current item.
 *
 * \param p_playlist the playlist structure
 * \param p_cur the current playlist item
 * \return nothing
 */
static void ResyncCurrentIndex( playlist_t *p_playlist, playlist_item_t *p_cur )
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{
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     PL_DEBUG( "resyncing on %s", PLI_NAME( p_cur ) );
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     /* Simply resync index */
     int i;
     p_playlist->i_current_index = -1;
     for( i = 0 ; i< p_playlist->current.i_size; i++ )
     {
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          if( ARRAY_VAL( p_playlist->current, i ) == p_cur )
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          {
              p_playlist->i_current_index = i;
              break;
          }
     }
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     PL_DEBUG( "%s is at %i", PLI_NAME( p_cur ), p_playlist->i_current_index );
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}

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void ResetCurrentlyPlaying( playlist_t *p_playlist, bool b_random,
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                            playlist_item_t *p_cur )
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{
    playlist_item_t *p_next = NULL;
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    stats_TimerStart( p_playlist, "Items array build",
                      STATS_TIMER_PLAYLIST_BUILD );
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    PL_DEBUG( "rebuilding array of current - root %s",
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              PLI_NAME( pl_priv(p_playlist)->status.p_node ) );
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    ARRAY_RESET( p_playlist->current );
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    p_playlist->i_current_index = -1;
    while( 1 )
    {
        /** FIXME: this is *slow* */
        p_next = playlist_GetNextLeaf( p_playlist,
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                                       pl_priv(p_playlist)->status.p_node,
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                                       p_next, true, false );
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        if( p_next )
        {
            if( p_next == p_cur )
                p_playlist->i_current_index = p_playlist->current.i_size;
            ARRAY_APPEND( p_playlist->current, p_next);
        }
        else break;
    }
    PL_DEBUG("rebuild done - %i items, index %i", p_playlist->current.i_size,
                                                  p_playlist->i_current_index);
    if( b_random )
    {
        /* Shuffle the array */
        srand( (unsigned int)mdate() );
        int j;
        for( j = p_playlist->current.i_size - 1; j > 0; j-- )
        {
            int i = rand() % (j+1); /* between 0 and j */
            playlist_item_t *p_tmp;
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            /* swap the two items */
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            p_tmp = ARRAY_VAL(p_playlist->current, i);
            ARRAY_VAL(p_playlist->current,i) = ARRAY_VAL(p_playlist->current,j);
            ARRAY_VAL(p_playlist->current,j) = p_tmp;
        }
    }
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    p_playlist->b_reset_currently_playing = false;
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    stats_TimerStop( p_playlist, STATS_TIMER_PLAYLIST_BUILD );
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}

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/**
 * Compute the next playlist item depending on
 * the playlist course mode (forward, backward, random, view,...).
 *
 * \param p_playlist the playlist object
 * \return nothing
 */
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playlist_item_t * playlist_NextItem( playlist_t *p_playlist )
{
    playlist_item_t *p_new = NULL;
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    int i_skip = 0, i;
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    bool b_loop = var_GetBool( p_playlist, "loop" );
    bool b_random = var_GetBool( p_playlist, "random" );
    bool b_repeat = var_GetBool( p_playlist, "repeat" );
    bool b_playstop = var_GetBool( p_playlist, "play-and-stop" );
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    /* Handle quickly a few special cases */
    /* No items to play */
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    if( p_playlist->items.i_size == 0 )
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    {
        msg_Info( p_playlist, "playlist is empty" );
        return NULL;
    }

    /* Repeat and play/stop */
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    if( !pl_priv(p_playlist)->request.b_request && b_repeat == true &&
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         get_current_status_item( p_playlist ) )
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    {
        msg_Dbg( p_playlist,"repeating item" );
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        return get_current_status_item( p_playlist );
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    }
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    if( !pl_priv(p_playlist)->request.b_request && b_playstop == true )
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    {
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        msg_Dbg( p_playlist,"stopping (play and stop)" );
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        return NULL;
    }

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    if( !pl_priv(p_playlist)->request.b_request &&
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        get_current_status_item( p_playlist ) )
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    {
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        playlist_item_t *p_parent = get_current_status_item( p_playlist );
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        while( p_parent )
        {
            if( p_parent->i_flags & PLAYLIST_SKIP_FLAG )
            {
                msg_Dbg( p_playlist, "blocking item, stopping") ;
                return NULL;
            }
            p_parent = p_parent->p_parent;
        }
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    }

    /* Start the real work */
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    if( pl_priv(p_playlist)->request.b_request )
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    {
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        p_new = pl_priv(p_playlist)->request.p_item;
        i_skip = pl_priv(p_playlist)->request.i_skip;
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        PL_DEBUG( "processing request item %s node %s skip %i",
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                        PLI_NAME( pl_priv(p_playlist)->request.p_item ),
                        PLI_NAME( pl_priv(p_playlist)->request.p_node ), i_skip );
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        if( pl_priv(p_playlist)->request.p_node &&
            pl_priv(p_playlist)->request.p_node != get_current_status_node( p_playlist ) )
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        {
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            set_current_status_node( p_playlist, pl_priv(p_playlist)->request.p_node );
            pl_priv(p_playlist)->request.p_node = NULL;
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            p_playlist->b_reset_currently_playing = true;
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        }
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        /* If we are asked for a node, go to it's first child */
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        if( i_skip == 0 && ( p_new == NULL || p_new->i_children != -1 ) )
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        {
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            i_skip++;
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            if( p_new != NULL )
            {
                p_new = playlist_GetNextLeaf( p_playlist, p_new, NULL, true, false );
                for( i = 0; i < p_playlist->current.i_size; i++ )
                {
                    if( p_new == ARRAY_VAL( p_playlist->current, i ) )
                    {
                        p_playlist->i_current_index = i;
                        i_skip = 0;
                    }
                }
            }
        }
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        if( p_playlist->b_reset_currently_playing )
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            /* A bit too bad to reset twice ... */
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            ResetCurrentlyPlaying( p_playlist, b_random, p_new );
        else if( p_new )
            ResyncCurrentIndex( p_playlist, p_new );
        else
            p_playlist->i_current_index = -1;

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        if( p_playlist->current.i_size && (i_skip > 0) )
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        {
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            if( p_playlist->i_current_index < -1 )
                p_playlist->i_current_index = -1;
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            for( i = i_skip; i > 0 ; i-- )
            {
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                p_playlist->i_current_index++;
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                if( p_playlist->i_current_index >= p_playlist->current.i_size )
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                {
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                    PL_DEBUG( "looping - restarting at beginning of node" );
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                    p_playlist->i_current_index = 0;
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                }
            }
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            p_new = ARRAY_VAL( p_playlist->current,
                               p_playlist->i_current_index );
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        }
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        else if( p_playlist->current.i_size && (i_skip < 0) )
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        {
            for( i = i_skip; i < 0 ; i++ )
            {
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                p_playlist->i_current_index--;
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                if( p_playlist->i_current_index <= -1 )
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                {
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                    PL_DEBUG( "looping - restarting at end of node" );
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                    p_playlist->i_current_index = p_playlist->current.i_size-1;
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                }
            }
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            p_new = ARRAY_VAL( p_playlist->current,
                               p_playlist->i_current_index );
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        }
        /* Clear the request */
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        pl_priv(p_playlist)->request.b_request = false;
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    }
    /* "Automatic" item change ( next ) */
    else
    {
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        PL_DEBUG( "changing item without a request (current %i/%i)",
                  p_playlist->i_current_index, p_playlist->current.i_size );
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        /* Cant go to next from current item */
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        if( get_current_status_item( p_playlist ) &&
            get_current_status_item( p_playlist )->i_flags & PLAYLIST_SKIP_FLAG )
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            return NULL;

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        if( p_playlist->b_reset_currently_playing )
            ResetCurrentlyPlaying( p_playlist, b_random,
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                                   get_current_status_item( p_playlist ) );
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        p_playlist->i_current_index++;
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        assert( p_playlist->i_current_index <= p_playlist->current.i_size );
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        if( p_playlist->i_current_index == p_playlist->current.i_size )
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        {
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            if( !b_loop || p_playlist->current.i_size == 0 ) return NULL;
            p_playlist->i_current_index = 0;
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        }
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        PL_DEBUG( "using item %i", p_playlist->i_current_index );
        if ( p_playlist->current.i_size == 0 ) return NULL;

        p_new = ARRAY_VAL( p_playlist->current, p_playlist->i_current_index );
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        /* The new item can't be autoselected  */
        if( p_new != NULL && p_new->i_flags & PLAYLIST_SKIP_FLAG )
            return NULL;
    }
    return p_new;
}

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/**
 * Start the input for an item
 *
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 * \param p_playlist the playlist object
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 * \param p_item the item to play
 * \return nothing
 */
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int playlist_PlayItem( playlist_t *p_playlist, playlist_item_t *p_item )
{
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    input_item_t *p_input = p_item->p_input;
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    sout_instance_t **pp_sout = &pl_priv(p_playlist)->p_sout;
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    int i_activity = var_GetInteger( p_playlist, "activity" ) ;
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    msg_Dbg( p_playlist, "creating new input thread" );

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    p_input->i_nb_played++;
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    set_current_status_item( p_playlist, p_item );
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    pl_priv(p_playlist)->status.i_status = PLAYLIST_RUNNING;
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    var_SetInteger( p_playlist, "activity", i_activity +
                    DEFAULT_INPUT_ACTIVITY );
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    input_thread_t * p_input_thread =
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        input_CreateThreadExtended( p_playlist, p_input, NULL, *pp_sout );
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    playlist_set_current_input( p_playlist, p_input_thread );
    vlc_object_release( p_input_thread );

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    *pp_sout = NULL;
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    char *psz_uri = input_item_GetURI( p_item->p_input );
    if( psz_uri && ( !strncmp( psz_uri, "directory:", 10 ) ||
                     !strncmp( psz_uri, "vlc:", 4 ) ) )
    {
        free( psz_uri );
        return VLC_SUCCESS;
    }
    free( psz_uri );

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    if( pl_priv(p_playlist)->fetcher.i_art_policy == ALBUM_ART_WHEN_PLAYED )
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    {
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        bool b_has_art;
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        char *psz_arturl, *psz_name;
        psz_arturl = input_item_GetArtURL( p_input );
        psz_name = input_item_GetName( p_input );

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        /* p_input->p_meta should not be null after a successfull CreateThread */
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        b_has_art = !EMPTY_STR( psz_arturl );
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        if( !b_has_art || strncmp( psz_arturl, "attachment://", 13 ) )
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        {
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            PL_DEBUG( "requesting art for %s", psz_name );
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            playlist_AskForArtEnqueue( p_playlist, p_input );
        }
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        free( psz_arturl );
        free( psz_name );
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    }
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    PL_UNLOCK;
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    var_SetInteger( p_playlist, "playlist-current", p_input->i_id );
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    PL_LOCK;
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    return VLC_SUCCESS;
}