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/*****************************************************************************
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 * thread.c : Playlist management functions
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 *****************************************************************************
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 * Copyright © 1999-2008 VLC authors and VideoLAN
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 * $Id$
 *
 * Authors: Samuel Hocevar <sam@zoy.org>
 *          Clément Stenac <zorglub@videolan.org>
 *
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 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
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 * (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
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser 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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 *****************************************************************************/
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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

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#include <assert.h>

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#include <vlc_common.h>
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#include <vlc_es.h>
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#include <vlc_input.h>
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#include <vlc_interface.h>
#include <vlc_playlist.h>
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#include <vlc_rand.h>
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#include "stream_output/stream_output.h"
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#include "playlist_internal.h"
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/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
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static void *Thread   ( void * );
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/*****************************************************************************
 * Main functions for the global thread
 *****************************************************************************/

/**
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 * Creates the main playlist thread.
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 */
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void playlist_Activate( playlist_t *p_playlist )
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{
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    playlist_private_t *p_sys = pl_priv(p_playlist);
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    if( vlc_clone( &p_sys->thread, Thread, p_playlist,
                   VLC_THREAD_PRIORITY_LOW ) )
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    {
        msg_Err( p_playlist, "cannot spawn playlist thread" );
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        abort();
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    }
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}

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/**
 * Stops the playlist forever (but do not destroy it yet).
 * Any input is stopped.
 * \return Nothing but waits for the playlist to be deactivated.
 */
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void playlist_Deactivate( playlist_t *p_playlist )
{
    playlist_private_t *p_sys = pl_priv(p_playlist);

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    PL_LOCK;
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    /* WARNING: There is a latent bug. It is assumed that only one thread will
     * be waiting for playlist deactivation at a time. So far, that works
     * as playlist_Deactivate() is only ever called while closing an
     * interface and interfaces are shut down serially by intf_DestroyAll(). */
    if( p_sys->killed )
    {
        PL_UNLOCK;
        return;
    }

    msg_Dbg( p_playlist, "deactivating the playlist" );
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    p_sys->killed = true;
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    vlc_cond_signal( &p_sys->signal );
    PL_UNLOCK;

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    vlc_join( p_sys->thread, NULL );
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}

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/* */

/* Input Callback */
static int InputEvent( vlc_object_t *p_this, char const *psz_cmd,
                       vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
    VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
    playlist_t *p_playlist = p_data;

    if( newval.i_int != INPUT_EVENT_STATE &&
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        newval.i_int != INPUT_EVENT_DEAD )
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        return VLC_SUCCESS;

    PL_LOCK;

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    /* XXX: signaling while not changing any parameter... suspicious... */
    vlc_cond_signal( &pl_priv(p_playlist)->signal );
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    PL_UNLOCK;
    return VLC_SUCCESS;
}

/**
 * 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
 */
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void ResyncCurrentIndex( playlist_t *p_playlist, playlist_item_t *p_cur )
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{
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    PL_ASSERT_LOCKED;

    PL_DEBUG( "resyncing on %s", PLI_NAME( p_cur ) );
    /* Simply resync index */
    int i;
    p_playlist->i_current_index = -1;
    for( i = 0 ; i< p_playlist->current.i_size; i++ )
    {
        if( ARRAY_VAL( p_playlist->current, i ) == p_cur )
        {
            p_playlist->i_current_index = i;
            break;
        }
    }
    PL_DEBUG( "%s is at %i", PLI_NAME( p_cur ), p_playlist->i_current_index );
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}

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/**
 * Reset the currently playing playlist.
 *
 * \param p_playlist the playlist structure
 * \param p_cur the current playlist item
 * \return nothing
 */
void ResetCurrentlyPlaying( playlist_t *p_playlist,
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                                   playlist_item_t *p_cur )
{
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    playlist_private_t *p_sys = pl_priv(p_playlist);

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    PL_DEBUG( "rebuilding array of current - root %s",
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              PLI_NAME( p_sys->status.p_node ) );
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    ARRAY_RESET( p_playlist->current );
    p_playlist->i_current_index = -1;
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    for( playlist_item_t *p_next = NULL; ; )
    {
        /** FIXME: this is *slow* */
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        p_next = playlist_GetNextLeaf( p_playlist,
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                                       p_sys->status.p_node,
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                                       p_next, true, false );
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        if( !p_next )
            break;

        if( p_next == p_cur )
            p_playlist->i_current_index = p_playlist->current.i_size;
        ARRAY_APPEND( p_playlist->current, p_next);
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    }
    PL_DEBUG("rebuild done - %i items, index %i", p_playlist->current.i_size,
                                                  p_playlist->i_current_index);
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    if( var_GetBool( p_playlist, "random" ) && ( p_playlist->current.i_size > 0 ) )
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    {
        /* Shuffle the array */
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        for( unsigned j = p_playlist->current.i_size - 1; j > 0; j-- )
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        {
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            unsigned i = vlc_lrand48() % (j+1); /* between 0 and j */
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            playlist_item_t *p_tmp;
            /* swap the two items */
            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_sys->b_reset_currently_playing = false;
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}


/**
 * Start the input for an item
 *
 * \param p_playlist the playlist object
 * \param p_item the item to play
 * \return nothing
 */
static int PlayItem( playlist_t *p_playlist, playlist_item_t *p_item )
{
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    playlist_private_t *p_sys = pl_priv(p_playlist);
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    input_item_t *p_input = p_item->p_input;

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    PL_ASSERT_LOCKED;

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    msg_Dbg( p_playlist, "creating new input thread" );

    p_input->i_nb_played++;
    set_current_status_item( p_playlist, p_item );

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    p_sys->status.i_status = PLAYLIST_RUNNING;
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    assert( p_sys->p_input == NULL );
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    input_thread_t *p_input_thread = input_Create( p_playlist, p_input, NULL, p_sys->p_input_resource );
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    if( p_input_thread )
    {
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        p_sys->p_input = p_input_thread;
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        var_AddCallback( p_input_thread, "intf-event", InputEvent, p_playlist );
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        var_SetAddress( p_playlist, "input-current", p_input_thread );

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        if( input_Start( p_sys->p_input ) )
        {
            vlc_object_release( p_input_thread );
            p_sys->p_input = p_input_thread = NULL;
        }
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    }
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    bool b_find_art = var_GetInteger( p_playlist, "album-art" )
                                                      == ALBUM_ART_WHEN_PLAYED;
    if( b_find_art )
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    {
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        char *psz_uri = input_item_GetURI( p_item->p_input );
        if( psz_uri != NULL && (!strncmp( psz_uri, "directory:", 10 ) ||
                                !strncmp( psz_uri, "vlc:", 4 )) )
            b_find_art = false;
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        free( psz_uri );
    }

    /* TODO store art policy in playlist private data */
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    if( b_find_art )
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    {
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        char *psz_arturl = input_item_GetArtURL( p_input );
        char *psz_name = input_item_GetName( p_input );
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        /* p_input->p_meta should not be null after a successful CreateThread */
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        bool b_has_art = !EMPTY_STR( psz_arturl );
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        if( !b_has_art || strncmp( psz_arturl, "attachment://", 13 ) )
        {
            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 );
    }
    PL_UNLOCK;
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    var_TriggerCallback( p_playlist, "activity" );
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    PL_LOCK;

    return VLC_SUCCESS;
}

/**
 * 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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static playlist_item_t *NextItem( playlist_t *p_playlist )
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{
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    playlist_private_t *p_sys = pl_priv(p_playlist);
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    playlist_item_t *p_new = NULL;

    /* Handle quickly a few special cases */
    /* No items to play */
    if( p_playlist->items.i_size == 0 )
    {
        msg_Info( p_playlist, "playlist is empty" );
        return NULL;
    }

    /* Start the real work */
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    if( p_sys->request.b_request )
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    {
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        p_new = p_sys->request.p_item;
        int i_skip = p_sys->request.i_skip;
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        PL_DEBUG( "processing request item: %s, node: %s, skip: %i",
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                        PLI_NAME( p_sys->request.p_item ),
                        PLI_NAME( p_sys->request.p_node ), i_skip );
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        if( p_sys->request.p_node &&
            p_sys->request.p_node != get_current_status_node( p_playlist ) )
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        {

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            set_current_status_node( p_playlist, p_sys->request.p_node );
            p_sys->request.p_node = NULL;
            p_sys->b_reset_currently_playing = true;
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        }

        /* If we are asked for a node, go to it's first child */
        if( i_skip == 0 && ( p_new == NULL || p_new->i_children != -1 ) )
        {
            i_skip++;
            if( p_new != NULL )
            {
                p_new = playlist_GetNextLeaf( p_playlist, p_new, NULL, true, false );
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                for( int i = 0; i < p_playlist->current.i_size; i++ )
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                {
                    if( p_new == ARRAY_VAL( p_playlist->current, i ) )
                    {
                        p_playlist->i_current_index = i;
                        i_skip = 0;
                    }
                }
            }
        }

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        if( p_sys->b_reset_currently_playing )
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            /* A bit too bad to reset twice ... */
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            ResetCurrentlyPlaying( p_playlist, p_new );
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        else if( p_new )
            ResyncCurrentIndex( p_playlist, p_new );
        else
            p_playlist->i_current_index = -1;

        if( p_playlist->current.i_size && (i_skip > 0) )
        {
            if( p_playlist->i_current_index < -1 )
                p_playlist->i_current_index = -1;
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            for( int i = i_skip; i > 0 ; i-- )
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            {
                p_playlist->i_current_index++;
                if( p_playlist->i_current_index >= p_playlist->current.i_size )
                {
                    PL_DEBUG( "looping - restarting at beginning of node" );
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                    /* reshuffle playlist when end is reached */
                    if( var_GetBool( p_playlist, "random" ) ) {
                        PL_DEBUG( "reshuffle playlist" );
                        ResetCurrentlyPlaying( p_playlist,
                                get_current_status_item( p_playlist ) );
                    }
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                    p_playlist->i_current_index = 0;
                }
            }
            p_new = ARRAY_VAL( p_playlist->current,
                               p_playlist->i_current_index );
        }
        else if( p_playlist->current.i_size && (i_skip < 0) )
        {
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            for( int i = i_skip; i < 0 ; i++ )
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            {
                p_playlist->i_current_index--;
                if( p_playlist->i_current_index <= -1 )
                {
                    PL_DEBUG( "looping - restarting at end of node" );
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                    /* reshuffle playlist when beginning is reached */
                    if( var_GetBool( p_playlist, "random" ) ) {
                        PL_DEBUG( "reshuffle playlist" );
                        ResetCurrentlyPlaying( p_playlist,
                                get_current_status_item( p_playlist ) );
                    }
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                    p_playlist->i_current_index = p_playlist->current.i_size-1;
                }
            }
            p_new = ARRAY_VAL( p_playlist->current,
                               p_playlist->i_current_index );
        }
        /* Clear the request */
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        p_sys->request.b_request = false;
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    }
    /* "Automatic" item change ( next ) */
    else
    {
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        bool b_loop = var_GetBool( p_playlist, "loop" );
        bool b_repeat = var_GetBool( p_playlist, "repeat" );
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        bool b_playstop = var_InheritBool( p_playlist, "play-and-stop" );
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        /* Repeat and play/stop */
        if( b_repeat && get_current_status_item( p_playlist ) )
        {
            msg_Dbg( p_playlist,"repeating item" );
            return get_current_status_item( p_playlist );
        }
        if( b_playstop )
        {
            msg_Dbg( p_playlist,"stopping (play and stop)" );
            return NULL;
        }

        /* */
        if( get_current_status_item( p_playlist ) )
        {
            playlist_item_t *p_parent = get_current_status_item( p_playlist );
            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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        PL_DEBUG( "changing item without a request (current %i/%i)",
                  p_playlist->i_current_index, p_playlist->current.i_size );
        /* Cant go to next from current item */
        if( get_current_status_item( p_playlist ) &&
            get_current_status_item( p_playlist )->i_flags & PLAYLIST_SKIP_FLAG )
            return NULL;

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        if( p_sys->b_reset_currently_playing )
            ResetCurrentlyPlaying( p_playlist,
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                                   get_current_status_item( p_playlist ) );

        p_playlist->i_current_index++;
        assert( p_playlist->i_current_index <= p_playlist->current.i_size );
        if( p_playlist->i_current_index == p_playlist->current.i_size )
        {
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            if( !b_loop || p_playlist->current.i_size == 0 )
                return NULL;
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            /* reshuffle after last item has been played */
            if( var_GetBool( p_playlist, "random" ) ) {
                PL_DEBUG( "reshuffle playlist" );
                ResetCurrentlyPlaying( p_playlist,
                                       get_current_status_item( p_playlist ) );
            }
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            p_playlist->i_current_index = 0;
        }
        PL_DEBUG( "using item %i", p_playlist->i_current_index );
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        if ( p_playlist->current.i_size == 0 )
            return NULL;
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        p_new = ARRAY_VAL( p_playlist->current, p_playlist->i_current_index );
        /* 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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static void LoopInput( playlist_t *p_playlist )
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{
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    playlist_private_t *p_sys = pl_priv(p_playlist);
    input_thread_t *p_input = p_sys->p_input;
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    assert( p_input != NULL );
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    if( p_sys->request.b_request || p_sys->killed )
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    {
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        PL_DEBUG( "incoming request - stopping current input" );
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        input_Stop( p_input, true );
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    }

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#warning Unsynchronized access to *p_input flags...
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    /* This input is dead. Remove it ! */
    if( p_input->b_dead )
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    {
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        p_sys->p_input = NULL;
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        PL_DEBUG( "dead input" );
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        PL_UNLOCK;

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        /* WARNING: Input resource manipulation and callback deletion are
         * incompatible with the playlist lock. */
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        if( !var_InheritBool( p_input, "sout-keep" ) )
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            input_resource_TerminateSout( p_sys->p_input_resource );
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        var_DelCallback( p_input, "intf-event", InputEvent, p_playlist );
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        input_Close( p_input );
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        var_TriggerCallback( p_playlist, "activity" );
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        PL_LOCK;
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        return;
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    }
    /* This input has finished, ask it to die ! */
    else if( p_input->b_error || p_input->b_eof )
    {
        PL_DEBUG( "finished input" );
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        input_Stop( p_input, false );
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    }
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    vlc_cond_wait( &p_sys->signal, &p_sys->lock );
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}
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static void LoopRequest( playlist_t *p_playlist, int i_status )
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{
    playlist_private_t *p_sys = pl_priv(p_playlist);
    assert( !p_sys->p_input );
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    /* No input. Several cases
     *  - No request, running status -> start new item
     *  - No request, stopped status -> collect garbage
     *  - Request, running requested -> start new item
     *  - Request, stopped requested -> collect garbage
    */
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    if( i_status == PLAYLIST_STOPPED )
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    {
        p_sys->status.i_status = PLAYLIST_STOPPED;
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        vlc_cond_wait( &p_sys->signal, &p_sys->lock );
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        return;
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    }
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    playlist_item_t *p_item = NextItem( p_playlist );
    if( p_item )
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    {
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        msg_Dbg( p_playlist, "starting playback of the new playlist item" );
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        ResyncCurrentIndex( p_playlist, p_item );
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        PlayItem( p_playlist, p_item );
        return;
    }
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    msg_Dbg( p_playlist, "nothing to play" );
    p_sys->status.i_status = PLAYLIST_STOPPED;
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    if( var_GetBool( p_playlist, "play-and-exit" ) )
    {
        msg_Info( p_playlist, "end of playlist, exiting" );
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        libvlc_Quit( p_playlist->p_libvlc );
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    }
}

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/**
 * Run the main control thread itself
 */
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static void *Thread ( void *data )
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{
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    playlist_t *p_playlist = data;
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    playlist_private_t *p_sys = pl_priv(p_playlist);
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    playlist_Lock( p_playlist );
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    for( ;; )
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    {
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        while( p_sys->p_input != NULL )
            LoopInput( p_playlist );
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        if( p_sys->killed )
            break; /* THE END */

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        const int status = p_sys->request.b_request ?
                           p_sys->request.i_status : p_sys->status.i_status;

        /* Destroy any video display if the playlist is supposed to stop */
        if( status == PLAYLIST_STOPPED
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         && input_resource_HasVout( p_sys->p_input_resource ) )
        {
            PL_UNLOCK; /* Mind: NO LOCKS while manipulating input resources! */
            input_resource_TerminateVout( p_sys->p_input_resource );
            PL_LOCK;
            continue; /* lost lock = lost state */
        }
549

550
        LoopRequest( p_playlist, status );
551
    }
552
    p_sys->status.i_status = PLAYLIST_STOPPED;
553
    playlist_Unlock( p_playlist );
554

555
    input_resource_Terminate( p_sys->p_input_resource );
556
    return NULL;
557
}