midi

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Unix_Linux

search.c：源码内容
							/*****************************************************************************
 * search.c : Search functions
 *****************************************************************************
 * Copyright (C) 1999-2009 the VideoLAN team
 * $Id: 66bd3ad0929344f5861b4769eb48271362dc9b68 $
 *
 * Authors: 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.
 *****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <vlc_common.h>
#include "vlc_playlist.h"
#include "playlist_internal.h"
/***************************************************************************
 * Item search functions
 ***************************************************************************/
/**
 * Search a playlist item by its playlist_item id.
 * The playlist have to be locked
 * @param p_playlist: the playlist
 * @param i_id: the id to find
 * @return the item or NULL on failure
 */
playlist_item_t* playlist_ItemGetById( playlist_t * p_playlist , int i_id )
{
    int i;
    PL_ASSERT_LOCKED;
    ARRAY_BSEARCH( p_playlist->all_items,->i_id, int, i_id, i );
    if( i != -1 )
        return ARRAY_VAL( p_playlist->all_items, i );
    else
        return NULL;
}
/**
 * Search an item by its input_item_t
 * The playlist have to be locked
 * @param p_playlist: the playlist
 * @param p_item: the input_item_t to find
 * @return the item, or NULL on failure
 */
playlist_item_t* playlist_ItemGetByInput( playlist_t * p_playlist,
                                          input_item_t *p_item )
{
    int i;
    PL_ASSERT_LOCKED;
    if( get_current_status_item( p_playlist ) &&
        get_current_status_item( p_playlist )->p_input == p_item )
    {
        return get_current_status_item( p_playlist );
    }
    /** todo Check if this is always incremental and whether we can bsearch */
    for( i =  0 ; i < p_playlist->all_items.i_size; i++ )
    {
        if( ARRAY_VAL(p_playlist->all_items, i)->p_input->i_id == p_item->i_id )
        {
            return ARRAY_VAL(p_playlist->all_items, i);
        }
    }
    return NULL;
}
/**
 * Get input by item id
 *
 * Find the playlist item matching the input id under the given node
 * param p_playlist the playlist
 * param i_input_id the id of the input to find
 * param p_root the root node of the search
 * return the playlist item or NULL on failure
 */
playlist_item_t * playlist_ItemGetByInputId( playlist_t *p_playlist,
                                             int i_input_id,
                                             playlist_item_t *p_root )
{
    int i;
    PL_ASSERT_LOCKED;
    assert( p_root != NULL );
    for( i = 0 ; i< p_root->i_children ; i++ )
    {
        if( p_root->pp_children[i]->p_input &&
            p_root->pp_children[i]->p_input->i_id == i_input_id )
        {
            return p_root->pp_children[i];
        }
        else if( p_root->pp_children[i]->i_children >= 0 )
        {
            return playlist_ItemGetByInputId( p_playlist, i_input_id,
                                              p_root->pp_children[i] );
        }
    }
    return NULL;
}
/***************************************************************************
 * Live search handling
 ***************************************************************************/
/**
 * Enable all items in the playlist
 * @param p_root: the current root item
 */
static void playlist_LiveSearchClean( playlist_item_t *p_root )
{
    for( int i = 0; i < p_root->i_children; i++ )
    {
        playlist_item_t *p_item = p_root->pp_children[i];
        if( p_item->i_children >= 0 )
            playlist_LiveSearchClean( p_item );
        p_item->i_flags &= ~PLAYLIST_DBL_FLAG;
    }
}
/**
 * Enable/Disable items in the playlist according to the search argument
 * @param p_root: the current root item
 * @param psz_string: the string to search
 * @return true if an item match
 */
static bool playlist_LiveSearchUpdateInternal( playlist_item_t *p_root,
                                               const char *psz_string )
{
    int i;
    bool b_match = false;
    for( i = 0 ; i < p_root->i_children ; i ++ )
    {
        bool b_enable = false;
        playlist_item_t *p_item = p_root->pp_children[i];
        // Go recurssively if their is some children
        if( p_item->i_children >= 0 &&
            playlist_LiveSearchUpdateInternal( p_item, psz_string ) )
        {
            b_enable = true;
        }
        if( !b_enable )
        {
            vlc_mutex_lock( &p_item->p_input->lock );
            // Do we have some meta ?
            if( p_item->p_input->p_meta )
            {
                // Use Title or fall back to psz_name
                const char *psz_title = vlc_meta_Get( p_item->p_input->p_meta, vlc_meta_Title );
                if( !psz_title )
                    psz_title = p_item->p_input->psz_name;
                const char *psz_album = vlc_meta_Get( p_item->p_input->p_meta, vlc_meta_Album );
                const char *psz_artist = vlc_meta_Get( p_item->p_input->p_meta, vlc_meta_Artist );
                b_enable = ( psz_title && strcasestr( psz_title, psz_string ) ) ||
                           ( psz_album && strcasestr( psz_album, psz_string ) ) ||
                           ( psz_artist && strcasestr( psz_artist, psz_string ) );
            }
            else
                b_enable = p_item->p_input->psz_name && strcasestr( p_item->p_input->psz_name, psz_string );
            vlc_mutex_unlock( &p_item->p_input->lock );
        }
        if( b_enable )
            p_item->i_flags &= ~PLAYLIST_DBL_FLAG;
        else
            p_item->i_flags |= PLAYLIST_DBL_FLAG;
        b_match |= b_enable;
   }
   return b_match;
}
/**
 * Launch the recursive search in the playlist
 * @param p_playlist: the playlist
 * @param p_root: the current root item
 * @param psz_string: the string to find
 * @return VLC_SUCCESS
 */
int playlist_LiveSearchUpdate( playlist_t *p_playlist, playlist_item_t *p_root,
                               const char *psz_string )
{
    PL_ASSERT_LOCKED;
    pl_priv(p_playlist)->b_reset_currently_playing = true;
    if( *psz_string )
        playlist_LiveSearchUpdateInternal( p_root, psz_string );
    else
        playlist_LiveSearchClean( p_root );
    vlc_cond_signal( &pl_priv(p_playlist)->signal );
    return VLC_SUCCESS;
}

						