src/playlist/art.c

   1 /*****************************************************************************
   2  * art.c : Art metadata handling
   3  *****************************************************************************
   4  * Copyright (C) 1998-2008 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Antoine Cellerier <dionoea@videolan.org>
   8  *          Clément Stenac <zorglub@videolan.org
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 #ifdef HAVE_CONFIG_H
  26 # include "config.h"
  27 #endif
  28
  29 #include <sys/stat.h>
  30 #include <errno.h>
  31
  32 #include <vlc_common.h>
  33 #include <vlc_input_item.h>
  34 #include <vlc_fs.h>
  35 #include <vlc_strings.h>
  36 #include <vlc_url.h>
  37 #include <vlc_md5.h>
  38
  39 #include "art.h"
  40
  41 static void ArtCacheCreateDir( const char *psz_dir )
  42 {
  43     char newdir[strlen( psz_dir ) + 1];
  44     strcpy( newdir, psz_dir );
  45     char * psz_newdir = newdir;
  46     char * psz = psz_newdir;
  47
  48     while( *psz )
  49     {
  50         while( *psz && *psz != DIR_SEP_CHAR) psz++;
  51         if( !*psz ) break;
  52         *psz = 0;
  53         if( !EMPTY_STR( psz_newdir ) )
  54             vlc_mkdir( psz_newdir, 0700 );
  55         *psz = DIR_SEP_CHAR;
  56         psz++;
  57     }
  58     vlc_mkdir( psz_dir, 0700 );
  59 }
  60
  61 static char* ArtCacheGetDirPath( const char *psz_arturl, const char *psz_artist,
  62                                  const char *psz_album,  const char *psz_title )
  63 {
  64     char *psz_dir;
  65     char *psz_cachedir = config_GetUserDir(VLC_CACHE_DIR);
  66
  67     if( !EMPTY_STR(psz_artist) && !EMPTY_STR(psz_album) )
  68     {
  69         char *psz_album_sanitized = strdup( psz_album );
  70         filename_sanitize( psz_album_sanitized );
  71         char *psz_artist_sanitized = strdup( psz_artist );
  72         filename_sanitize( psz_artist_sanitized );
  73         if( asprintf( &psz_dir, "%s" DIR_SEP "art" DIR_SEP "artistalbum"
  74                       DIR_SEP "%s" DIR_SEP "%s", psz_cachedir,
  75                       psz_artist_sanitized, psz_album_sanitized ) == -1 )
  76             psz_dir = NULL;
  77         free( psz_album_sanitized );
  78         free( psz_artist_sanitized );
  79     }
  80     else
  81     {
  82         /* If artist or album are missing, cache by art download URL.
  83          * If the URL is an attachment://, add the title to the cache name.
  84          * It will be md5 hashed to form a valid cache filename.
  85          * We assume that psz_arturl is always the download URL and not the
  86          * already hashed filename.
  87          * (We should never need to call this function if art has already been
  88          * downloaded anyway).
  89          */
  90         struct md5_s md5;
  91         InitMD5( &md5 );
  92         AddMD5( &md5, psz_arturl, strlen( psz_arturl ) );
  93         if( !strncmp( psz_arturl, "attachment://", 13 ) )
  94             AddMD5( &md5, psz_title, strlen( psz_title ) );
  95         EndMD5( &md5 );
  96         char * psz_arturl_sanitized = psz_md5_hash( &md5 );
  97         if( asprintf( &psz_dir, "%s" DIR_SEP "art" DIR_SEP "arturl" DIR_SEP
  98                       "%s", psz_cachedir, psz_arturl_sanitized ) == -1 )
  99             psz_dir = NULL;
 100         free( psz_arturl_sanitized );
 101     }
 102     free( psz_cachedir );
 103     return psz_dir;
 104 }
 105
 106 static char *ArtCachePath( input_item_t *p_item )
 107 {
 108     char* psz_path = NULL;
 109     const char *psz_artist;
 110     const char *psz_album;
 111     const char *psz_arturl;
 112     const char *psz_title;
 113
 114     vlc_mutex_lock( &p_item->lock );
 115
 116     if( !p_item->p_meta )
 117         p_item->p_meta = vlc_meta_New();
 118     if( !p_item->p_meta )
 119         goto end;
 120
 121     psz_artist = vlc_meta_Get( p_item->p_meta, vlc_meta_Artist );
 122     psz_album = vlc_meta_Get( p_item->p_meta, vlc_meta_Album );
 123     psz_arturl = vlc_meta_Get( p_item->p_meta, vlc_meta_ArtworkURL );
 124     psz_title = vlc_meta_Get( p_item->p_meta, vlc_meta_Title );
 125     if( !psz_title )
 126         psz_title = p_item->psz_name;
 127
 128
 129     if( (EMPTY_STR(psz_artist) || EMPTY_STR(psz_album) ) && !psz_arturl )
 130         goto end;
 131
 132     psz_path = ArtCacheGetDirPath( psz_arturl, psz_artist, psz_album, psz_title );
 133
 134 end:
 135     vlc_mutex_unlock( &p_item->lock );
 136     return psz_path;
 137 }
 138
 139 static char *ArtCacheName( input_item_t *p_item, const char *psz_type )
 140 {
 141     char *psz_path = ArtCachePath( p_item );
 142     if( !psz_path )
 143         return NULL;
 144
 145     ArtCacheCreateDir( psz_path );
 146
 147     char *psz_ext = strdup( psz_type ? psz_type : "" );
 148     filename_sanitize( psz_ext );
 149     char *psz_filename;
 150     if( asprintf( &psz_filename, "%s" DIR_SEP "art%s", psz_path, psz_ext ) < 0 )
 151         psz_filename = NULL;
 152
 153     free( psz_ext );
 154     free( psz_path );
 155
 156     return psz_filename;
 157 }
 158
 159 /* */
 160 int playlist_FindArtInCache( input_item_t *p_item )
 161 {
 162     char *psz_path = ArtCachePath( p_item );
 163
 164     if( !psz_path )
 165         return VLC_EGENERIC;
 166
 167     /* Check if file exists */
 168     DIR *p_dir = vlc_opendir( psz_path );
 169     if( !p_dir )
 170     {
 171         free( psz_path );
 172         return VLC_EGENERIC;
 173     }
 174
 175     bool b_found = false;
 176     const char *psz_filename;
 177     while( !b_found && (psz_filename = vlc_readdir( p_dir )) )
 178     {
 179         if( !strncmp( psz_filename, "art", 3 ) )
 180         {
 181             char *psz_file;
 182             if( asprintf( &psz_file, "%s" DIR_SEP "%s",
 183                           psz_path, psz_filename ) != -1 )
 184             {
 185                 char *psz_uri = vlc_path2uri( psz_file, "file" );
 186                 if( psz_uri )
 187                 {
 188                     input_item_SetArtURL( p_item, psz_uri );
 189                     free( psz_uri );
 190                 }
 191                 free( psz_file );
 192             }
 193
 194             b_found = true;
 195         }
 196     }
 197
 198     /* */
 199     closedir( p_dir );
 200     free( psz_path );
 201     return b_found ? VLC_SUCCESS : VLC_EGENERIC;
 202 }
 203
 204 static char * GetDirByItemUIDs( char *psz_uid )
 205 {
 206     char *psz_cachedir = config_GetUserDir(VLC_CACHE_DIR);
 207     char *psz_dir;
 208     if( asprintf( &psz_dir, "%s" DIR_SEP
 209                   "by-iiuid" DIR_SEP
 210                   "%s",
 211                   psz_cachedir, psz_uid ) == -1 )
 212     {
 213         psz_dir = NULL;
 214     }
 215     free( psz_cachedir );
 216     return psz_dir;
 217 }
 218
 219 static char * GetFileByItemUID( char *psz_dir, const char *psz_type )
 220 {
 221     char *psz_file;
 222     if( asprintf( &psz_file, "%s" DIR_SEP "%s", psz_dir, psz_type ) == -1 )
 223     {
 224         psz_file = NULL;
 225     }
 226     return psz_file;
 227 }
 228
 229 int playlist_FindArtInCacheUsingItemUID( input_item_t *p_item )
 230 {
 231     char *uid = input_item_GetInfo( p_item, "uid", "md5" );
 232     if ( ! *uid )
 233     {
 234         free( uid );
 235         return VLC_EGENERIC;
 236     }
 237
 238     /* we have an input item uid set */
 239     bool b_done = false;
 240     char *psz_byuiddir = GetDirByItemUIDs( uid );
 241     char *psz_byuidfile = GetFileByItemUID( psz_byuiddir, "arturl" );
 242     free( psz_byuiddir );
 243     if( psz_byuidfile )
 244     {
 245         FILE *fd = vlc_fopen( psz_byuidfile, "rb" );
 246         if ( fd )
 247         {
 248             char sz_cachefile[2049];
 249             /* read the cache hash url */
 250             if ( fgets( sz_cachefile, 2048, fd ) != NULL )
 251             {
 252                 input_item_SetArtURL( p_item, sz_cachefile );
 253                 b_done = true;
 254             }
 255             fclose( fd );
 256         }
 257         free( psz_byuidfile );
 258     }
 259     free( uid );
 260     if ( b_done ) return VLC_SUCCESS;
 261
 262     return VLC_EGENERIC;
 263 }
 264
 265 /* */
 266 int playlist_SaveArt( vlc_object_t *obj, input_item_t *p_item,
 267                       const void *data, size_t length, const char *psz_type )
 268 {
 269     char *psz_filename = ArtCacheName( p_item, psz_type );
 270
 271     if( !psz_filename )
 272         return VLC_EGENERIC;
 273
 274     char *psz_uri = vlc_path2uri( psz_filename, "file" );
 275     if( !psz_uri )
 276     {
 277         free( psz_filename );
 278         return VLC_EGENERIC;
 279     }
 280
 281     /* Check if we already dumped it */
 282     struct stat s;
 283     if( !vlc_stat( psz_filename, &s ) )
 284     {
 285         input_item_SetArtURL( p_item, psz_uri );
 286         free( psz_filename );
 287         free( psz_uri );
 288         return VLC_SUCCESS;
 289     }
 290
 291     /* Dump it otherwise */
 292     FILE *f = vlc_fopen( psz_filename, "wb" );
 293     if( f )
 294     {
 295         if( fwrite( data, 1, length, f ) != length )
 296         {
 297             msg_Err( obj, "%s: %s", psz_filename, vlc_strerror_c(errno) );
 298         }
 299         else
 300         {
 301             msg_Dbg( obj, "album art saved to %s", psz_filename );
 302             input_item_SetArtURL( p_item, psz_uri );
 303         }
 304         fclose( f );
 305     }
 306     free( psz_uri );
 307
 308     /* save uid info */
 309     char *uid = input_item_GetInfo( p_item, "uid", "md5" );
 310     if ( ! *uid )
 311     {
 312         free( uid );
 313         goto end;
 314     }
 315
 316     char *psz_byuiddir = GetDirByItemUIDs( uid );
 317     char *psz_byuidfile = GetFileByItemUID( psz_byuiddir, "arturl" );
 318     ArtCacheCreateDir( psz_byuiddir );
 319     free( psz_byuiddir );
 320
 321     if ( psz_byuidfile )
 322     {
 323         f = vlc_fopen( psz_byuidfile, "wb" );
 324         if ( f )
 325         {
 326             if( fputs( "file://", f ) < 0 || fputs( psz_filename, f ) < 0 )
 327                 msg_Err( obj, "Error writing %s: %s", psz_byuidfile,
 328                          vlc_strerror_c(errno) );
 329             fclose( f );
 330         }
 331         free( psz_byuidfile );
 332     }
 333     free( uid );
 334     /* !save uid info */
 335 end:
 336     free( psz_filename );
 337     return VLC_SUCCESS;
 338 }
 339