vlc_playlist.h

/*****************************************************************************
 * vlc_playlist.h : Playlist functions
 *****************************************************************************
 * Copyright (C) 1999-2004 the VideoLAN team
 * $Id$
 *
 * Authors: Samuel Hocevar <sam@zoy.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.
 *****************************************************************************/

#ifndef _VLC_PLAYLIST_H_
#define _VLC_PLAYLIST_H_

/**
 *  \file
 *  This file contain structures and function prototypes related
 *  to the playlist in vlc
 */

/**
 * \defgroup vlc_playlist Playlist
 * @{
 */

/**
 * playlist export helper structure
 */
struct playlist_export_t
{
    char *psz_filename;
    FILE *p_file;
    playlist_item_t *p_root;
};

/**
 * playlist item / node
 * \see playlist_t
 */
struct playlist_item_t
{
    input_item_t           *p_input;    /**< input item descriptor */

    /* Tree specific fields */
    int                    i_children;  /**< Number of children
                                             -1 if not a node */
    playlist_item_t      **pp_children; /**< Children nodes/items */
    playlist_item_t       *p_parent;    /**< Item parent */

    int                    i_id;        /**< Playlist item specific id */

    uint8_t                i_flags;     /**< Flags */
};

#define PLAYLIST_SAVE_FLAG      0x0001    /**< Must it be saved */
#define PLAYLIST_SKIP_FLAG      0x0002    /**< Must playlist skip after it ? */
#define PLAYLIST_DBL_FLAG       0x0004    /**< Is it disabled ? */
#define PLAYLIST_RO_FLAG        0x0008    /**< Write-enabled ? */
#define PLAYLIST_REMOVE_FLAG    0x0010    /**< Remove this item at the end */
#define PLAYLIST_EXPANDED_FLAG  0x0020    /**< Expanded node */
#define PLAYLIST_PREFCAT_FLAG   0x0040    /**< Prefer category */

/**
 * Playlist status
 */
typedef enum
{ PLAYLIST_STOPPED,PLAYLIST_RUNNING,PLAYLIST_PAUSED } playlist_status_t;


struct services_discovery_t
{
    VLC_COMMON_MEMBERS
    char *psz_module;

    module_t *p_module;

    services_discovery_sys_t *p_sys;
    void (*pf_run) ( services_discovery_t *);
};

struct playlist_preparse_t
{
    VLC_COMMON_MEMBERS
    vlc_mutex_t     lock;
    int             i_waiting;
    input_item_t  **pp_waiting;
};


/** Structure containing information about the playlist */
struct playlist_t
{
    VLC_COMMON_MEMBERS
/**
   \name playlist_t
   These members are uniq to playlist_t
*/
/*@{*/
    int                   i_enabled; /**< How many items are enabled ? */

    /* Arrays of items */
    int                   i_size;   /**< total size of the list */
    playlist_item_t **    pp_items; /**< array of pointers to the
                                     * playlist items */
    int                   i_all_size; /**< size of list of items and nodes */
    playlist_item_t **    pp_all_items; /**< array of pointers to the
                                         * playlist items and nodes */
    int                   i_input_items;
    input_item_t **       pp_input_items;

    int                   i_random;     /**< Number of candidates for random */
    playlist_item_t **    pp_random;    /**< Random candidate items */
    int                   i_random_index; /**< Current random item */
    vlc_bool_t            b_reset_random; /**< Recreate random array ?*/

    int                   i_last_playlist_id; /**< Last id to an item */
    int                   i_last_input_id ; /**< Last id on an input */

    services_discovery_t **pp_sds;
    int                   i_sds;

    /* Predefined items */
    playlist_item_t *     p_root_category;
    playlist_item_t *     p_root_onelevel;
    playlist_item_t *     p_local_category; /** < "Playlist" in CATEGORY view */
    playlist_item_t *     p_ml_category; /** < "Library" in CATEGORY view */
    playlist_item_t *     p_local_onelevel; /** < "Playlist" in ONELEVEL view */
    playlist_item_t *     p_ml_onelevel; /** < "Library" in ONELEVEL iew */

    vlc_bool_t            b_always_tree;/**< Always display as tree */
    vlc_bool_t            b_never_tree;/**< Never display as tree */

    /* Runtime */
    input_thread_t *      p_input;  /**< the input thread associated
                                     * with the current item */
    int                   i_sort; /**< Last sorting applied to the playlist */
    int                   i_order; /**< Last ordering applied to the playlist */
    mtime_t               i_vout_destroyed_date;
    mtime_t               i_sout_destroyed_date;
    playlist_preparse_t  *p_preparse; /**< Preparser object */

    vlc_mutex_t gc_lock;         /**< Lock to protect the garbage collection */

    struct {
        /* Current status. These fields are readonly, only the playlist
         * main loop can touch it*/
        playlist_status_t   i_status;  /**< Current status of playlist */
        playlist_item_t *   p_item; /**< Currently playing/active item */
        playlist_item_t *   p_node; /**< Current node to play from */
    } status;

    struct {
        /* Request. Use this to give orders to the playlist main loop  */
        int                 i_status; /**< requested playlist status */
        playlist_item_t *   p_node;   /**< requested node to play from */
        playlist_item_t *   p_item;   /**< requested item to play in the node */

        int                 i_skip;   /**< Number of items to skip */

        vlc_bool_t          b_request;/**< Set to true by the requester
                                           The playlist sets it back to false
                                           when processing the request */
        vlc_mutex_t         lock;     /**< Lock to protect request */
    } request;

    // Playlist-unrelated fields
    interaction_t       *p_interaction;       /**< Interaction manager */
    global_stats_t      *p_stats;             /**< Global statistics */
    /*@}*/
};

/* Helper to add an item */
struct playlist_add_t
{
    int i_node;
    int i_item;
    int i_position;
};

#define SORT_ID 0
#define SORT_TITLE 1
#define SORT_TITLE_NODES_FIRST 2
#define SORT_ARTIST 3
#define SORT_GENRE 4
#define SORT_RANDOM 5
#define SORT_DURATION 6
#define SORT_TITLE_NUMERIC 7
#define SORT_ALBUM 8

#define ORDER_NORMAL 0
#define ORDER_REVERSE 1

/*****************************************************************************
 * Prototypes
 *****************************************************************************/

/* Global thread */
#define playlist_ThreadCreate(a) __playlist_ThreadCreate(VLC_OBJECT(a))
playlist_t *__playlist_ThreadCreate   ( vlc_object_t * );
int           playlist_ThreadDestroy  ( playlist_t * );

/* Helpers */
#define PL_LOCK vlc_mutex_lock( &p_playlist->object_lock );
#define PL_UNLOCK vlc_mutex_unlock( &p_playlist->object_lock );

/* Creation/Deletion */
playlist_t *playlist_Create   ( vlc_object_t * );
void        playlist_Destroy  ( playlist_t * );

/* Engine */
void playlist_MainLoop( playlist_t * );
void playlist_LastLoop( playlist_t * );
void playlist_PreparseLoop( playlist_preparse_t * );

/* Control */
playlist_item_t * playlist_NextItem  ( playlist_t * );
int playlist_PlayItem  ( playlist_t *, playlist_item_t * );

/* Playlist control */
#define playlist_Play(p) playlist_LockControl(p,PLAYLIST_PLAY )
#define playlist_Pause(p) playlist_LockControl(p,PLAYLIST_PAUSE )
#define playlist_Stop(p) playlist_LockControl(p,PLAYLIST_STOP )
#define playlist_Next(p) playlist_LockControl(p,PLAYLIST_SKIP, 1)
#define playlist_Prev(p) playlist_LockControl(p,PLAYLIST_SKIP, -1)
#define playlist_Skip(p,i) playlist_LockControl(p,PLAYLIST_SKIP, i)

VLC_EXPORT( int, playlist_Control, ( playlist_t *, int, ...  ) );
VLC_EXPORT( int, playlist_LockControl, ( playlist_t *, int, ...  ) );

VLC_EXPORT( void,  playlist_Clear, ( playlist_t * ) );
VLC_EXPORT( void,  playlist_LockClear, ( playlist_t * ) );

VLC_EXPORT( int, playlist_PreparseEnqueue, (playlist_t *, input_item_t *) );
VLC_EXPORT( int, playlist_PreparseEnqueueItem, (playlist_t *, playlist_item_t *) );

/* Services discovery */

VLC_EXPORT( int, playlist_ServicesDiscoveryAdd, (playlist_t *, const char *));
VLC_EXPORT( int, playlist_ServicesDiscoveryRemove, (playlist_t *, const char *));
VLC_EXPORT( int, playlist_AddSDModules, (playlist_t *, char *));
VLC_EXPORT( vlc_bool_t, playlist_IsServicesDiscoveryLoaded, ( playlist_t *,const char *));

/* Playlist sorting */
VLC_EXPORT( int,  playlist_TreeMove, ( playlist_t *, playlist_item_t *, playlist_item_t *, int ) );
VLC_EXPORT( int,  playlist_NodeSort, ( playlist_t *, playlist_item_t *,int, int ) );
VLC_EXPORT( int,  playlist_RecursiveNodeSort, ( playlist_t *, playlist_item_t *,int, int ) );

/* Load/Save */
VLC_EXPORT( int,  playlist_Import, ( playlist_t *, const char *, playlist_item_t *, vlc_bool_t ) );
VLC_EXPORT( int,  playlist_Export, ( playlist_t *, const char *, playlist_item_t *, const char * ) );

/********************************************************
 * Item management
 ********************************************************/

/*************************** Item creation **************************/

VLC_EXPORT( playlist_item_t* , playlist_ItemNewWithType, ( vlc_object_t *,const char *,const char *, int , const char **, int, int) );

#define playlist_ItemNew( a , b, c ) __playlist_ItemNew(VLC_OBJECT(a) , b , c )
/** Create a new item, without adding it to the playlist
 * \param p_obj a vlc object (anyone will do)
 * \param psz_uri the mrl of the item
 * \param psz_name a text giving a name or description of the item
 * \return the new item or NULL on failure
 */
static inline playlist_item_t * __playlist_ItemNew( vlc_object_t *p_obj,
                                     const char *psz_uri, const char *psz_name )
{
    /* 0 = ITEM_TYPE_UNKNOWN */
    return playlist_ItemNewWithType( p_obj, psz_uri,  psz_name, 0, NULL, -1,0);
}

#define playlist_ItemNewFromInput(a,b) __playlist_ItemNewFromInput(VLC_OBJECT(a),b)
VLC_EXPORT( playlist_item_t *, __playlist_ItemNewFromInput, ( vlc_object_t *p_obj,input_item_t *p_input ) );

/*************************** Item deletion **************************/
VLC_EXPORT( int, playlist_ItemDelete, ( playlist_item_t * ) );
VLC_EXPORT( int,  playlist_DeleteAllFromInput, ( playlist_t *, int ) );
VLC_EXPORT( int,  playlist_DeleteFromInput, ( playlist_t *, int, playlist_item_t *, vlc_bool_t ) );
VLC_EXPORT( int,  playlist_DeleteFromItemId, ( playlist_t *, int ) );
VLC_EXPORT( int,  playlist_LockDelete, ( playlist_t *, int ) );
VLC_EXPORT( int,  playlist_LockDeleteAllFromInput, ( playlist_t *, int ) );

/*************************** Item fields accessors **************************/
VLC_EXPORT( int, playlist_ItemSetName, (playlist_item_t *,  char * ) );

/******************** Item addition ********************/
VLC_EXPORT( int,  playlist_Add,    ( playlist_t *, const char *, const char *, int, int, vlc_bool_t ) );
VLC_EXPORT( int,  playlist_AddExt, ( playlist_t *, const char *, const char *, int, int, mtime_t, const char **,int, vlc_bool_t ) );
VLC_EXPORT( int, playlist_AddInput, ( playlist_t *, input_item_t *,int , int, vlc_bool_t ) );
VLC_EXPORT( playlist_item_t *, playlist_NodeAddInput, ( playlist_t *, input_item_t *,playlist_item_t *,int , int ) );
VLC_EXPORT( void, playlist_NodeAddItem, ( playlist_t *, playlist_item_t *, playlist_item_t *,int , int ) );
VLC_EXPORT( int, playlist_BothAddInput, ( playlist_t *, input_item_t *,playlist_item_t *,int , int ) );
VLC_EXPORT( void, playlist_AddWhereverNeeded, (playlist_t* , input_item_t*, playlist_item_t*,playlist_item_t*,vlc_bool_t, int ) );

/** Add a MRL into the playlist.
 * \see playlist_Add
 */
static inline int playlist_PlaylistAdd( playlist_t *p_playlist,
                          const char *psz_uri, const char *psz_name,
                          int i_mode, int i_pos )
{
    return playlist_Add( p_playlist, psz_uri, psz_name, i_mode, i_pos,
                         VLC_TRUE);
}

/** Add a MRL to the media library
 * \see playlist_Add
 */
static inline int playlist_MLAdd( playlist_t *p_playlist, const char *psz_uri,
                                  const char *psz_name, int i_mode, int i_pos )
{
    return playlist_Add( p_playlist, psz_uri, psz_name, i_mode, i_pos,
                         VLC_FALSE );
}

/** Add a MRL to the playlist, with duration and options given
 * \see playlist_AddExt
 */
static inline int playlist_PlaylistAddExt( playlist_t *p_playlist,
            const char * psz_uri, const char *psz_name, int i_mode, int i_pos,
            mtime_t i_duration, const char **ppsz_options, int i_options ) 
{
    return playlist_AddExt( p_playlist, psz_uri, psz_name, i_mode, i_pos,
                            i_duration, ppsz_options, i_options, VLC_TRUE );
}

/** Add a MRL to the media library, with duration and options given
 * \see playlist_AddExt
 */
static inline int playlist_MLAddExt( playlist_t *p_playlist,
            const char * psz_uri, const char *psz_name, int i_mode, int i_pos,
            mtime_t i_duration, const char **ppsz_options, int i_options ) 
{
    return playlist_AddExt( p_playlist, psz_uri, psz_name, i_mode, i_pos,
                            i_duration, ppsz_options, i_options, VLC_FALSE );
}

/** Add an input item to the playlist node 
 * \see playlist_AddInput
 */
static inline int playlist_PlaylistAddInput( playlist_t* p_playlist,
                                input_item_t *p_input, int i_mode, int i_pos )
{
    return playlist_AddInput( p_playlist, p_input, i_mode, i_pos, VLC_TRUE );
}

/** Add an input item to the media library 
 * \see playlist_AddInput
 */
static inline int playlist_MLAddInput( playlist_t* p_playlist,
                                input_item_t *p_input, int i_mode, int i_pos )
{
    return playlist_AddInput( p_playlist, p_input, i_mode, i_pos, VLC_FALSE );
}

void playlist_SendAddNotify( playlist_t *p_playlist, int i_item_id, int i_node_id );

/********************** Misc item operations **********************/
VLC_EXPORT( playlist_item_t*, playlist_ItemToNode, (playlist_t *,playlist_item_t *) );
VLC_EXPORT( playlist_item_t*, playlist_LockItemToNode, (playlist_t *,playlist_item_t *) );

playlist_item_t *playlist_ItemFindFromInputAndRoot( playlist_t *p_playlist,
                                   int i_input_id, playlist_item_t *p_root );

/********************************** Item search *************************/
VLC_EXPORT( playlist_item_t *, playlist_ItemGetById, (playlist_t *, int) );
VLC_EXPORT( playlist_item_t *, playlist_ItemGetByInput, (playlist_t *,input_item_t * ) );

static inline playlist_item_t *playlist_LockItemGetById( playlist_t *p_playlist,
                                                         int i_id)
{
    playlist_item_t *p_ret;
    vlc_mutex_lock( &p_playlist->object_lock );
    p_ret = playlist_ItemGetById( p_playlist, i_id );
    vlc_mutex_unlock( &p_playlist->object_lock );
    return p_ret;
}

static inline playlist_item_t *playlist_LockItemGetByInput(
                                playlist_t *p_playlist, input_item_t *p_item )
{
    playlist_item_t *p_ret;
    vlc_mutex_lock( &p_playlist->object_lock );
    p_ret = playlist_ItemGetByInput( p_playlist, p_item );
    vlc_mutex_unlock( &p_playlist->object_lock );
    return p_ret;
}

VLC_EXPORT( int, playlist_LiveSearchUpdate, (playlist_t *, playlist_item_t *, const char *) );

/********************************************************
 * Tree management
 ********************************************************/
VLC_EXPORT(void, playlist_NodeDump, ( playlist_t *p_playlist, playlist_item_t *p_item, int i_level ) );
VLC_EXPORT( int, playlist_NodeChildrenCount, (playlist_t *,playlist_item_t* ) );

/* Node management */
VLC_EXPORT( playlist_item_t *, playlist_NodeCreate, ( playlist_t *, char *, playlist_item_t * p_parent ) );
VLC_EXPORT( int, playlist_NodeAppend, (playlist_t *,playlist_item_t*,playlist_item_t *) );
VLC_EXPORT( int, playlist_NodeInsert, (playlist_t *,playlist_item_t*,playlist_item_t *, int) );
VLC_EXPORT( int, playlist_NodeRemoveItem, (playlist_t *,playlist_item_t*,playlist_item_t *) );
VLC_EXPORT( playlist_item_t *, playlist_ChildSearchName, (playlist_item_t*, const char* ) );
VLC_EXPORT( int, playlist_NodeDelete, ( playlist_t *, playlist_item_t *, vlc_bool_t , vlc_bool_t ) );
VLC_EXPORT( int, playlist_NodeEmpty, ( playlist_t *, playlist_item_t *, vlc_bool_t ) );
VLC_EXPORT( void, playlist_NodesCreateForSD, (playlist_t *, char *, playlist_item_t **, playlist_item_t ** ) );
VLC_EXPORT( playlist_item_t *, playlist_GetPreferredNode, ( playlist_t *p_playlist, playlist_item_t *p_node ) );

/* Tree walking - These functions are only for playlist, not plugins */
int playlist_GetAllEnabledChildren( playlist_t *p_playlist,
                                    playlist_item_t *p_node,
                                    playlist_item_t ***ppp_items );
playlist_item_t *playlist_GetNextLeaf( playlist_t *p_playlist,
                                    playlist_item_t *p_root,
                                    playlist_item_t *, vlc_bool_t, vlc_bool_t );
playlist_item_t *playlist_GetPrevLeaf( playlist_t *p_playlist,
                                    playlist_item_t *p_root,
                                    playlist_item_t *, vlc_bool_t, vlc_bool_t );
playlist_item_t *playlist_GetLastLeaf( playlist_t *p_playlist,
                                    playlist_item_t *p_root );

/***********************************************************************
 * Inline functions
 ***********************************************************************/

/** Tell if the playlist is currently running */
static inline vlc_bool_t playlist_IsPlaying( playlist_t * p_playlist )
{
    vlc_bool_t b_playing;
    vlc_mutex_lock( &p_playlist->object_lock );
    b_playing = p_playlist->status.i_status == PLAYLIST_RUNNING;
    vlc_mutex_unlock( &p_playlist->object_lock );
    return( b_playing );
}

/** Tell if the playlist is empty */
static inline vlc_bool_t playlist_IsEmpty( playlist_t * p_playlist )
{
    vlc_bool_t b_empty;
    vlc_mutex_lock( &p_playlist->object_lock );
    b_empty = p_playlist->i_size == 0;
    vlc_mutex_unlock( &p_playlist->object_lock );
    return( b_empty );
}

/**
 * @}
 */

#define PLAYLIST_DEBUG 1

#ifdef PLAYLIST_DEBUG
#define PL_DEBUG( msg, args... ) msg_Dbg( p_playlist, msg, ## args )
#else
#define PL_DEBUG( msg, args ... ) {}
#endif

#define PLI_NAME( p ) p ? p->p_input->psz_name : "null"

#endif