modules/demux/vorbis.h

   1 /*****************************************************************************
   2  * vorbis.h: Vorbis Comment parser
   3  *****************************************************************************
   4  * Copyright (C) 2008 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #include <vlc_charset.h>
  25
  26 static inline void vorbis_ParseComment( vlc_meta_t **pp_meta, const uint8_t *p_data, int i_data )
  27 {
  28     int n;
  29     int i_comment;
  30     if( i_data < 8 )
  31         return;
  32
  33 #define RM(x) do { i_data -= (x); p_data += (x); } while(0)
  34     n = GetDWLE(p_data); RM(4);
  35     if( n < 0 || n > i_data )
  36         return;
  37 #if 0
  38     if( n > 0 )
  39     {
  40         /* TODO report vendor string ? */
  41         char *psz_vendor = psz_vendor = strndup( p_data, n );
  42         free( psz_vendor );
  43     }
  44 #endif
  45     RM(n);
  46
  47     if( i_data < 4 )
  48         return;
  49
  50     i_comment = GetDWLE(p_data); RM(4);
  51     if( i_comment <= 0 )
  52         return;
  53
  54     /* */
  55     vlc_meta_t *p_meta = *pp_meta;
  56     if( !p_meta )
  57         *pp_meta = p_meta = vlc_meta_New();
  58     if( !p_meta )
  59         return;
  60
  61     for( ; i_comment > 0; i_comment-- )
  62     {
  63         char *psz;
  64         if( i_data < 4 )
  65             break;
  66         n = GetDWLE(p_data); RM(4);
  67         if( n > i_data )
  68             break;
  69         if( n <= 0 )
  70             continue;
  71
  72         psz = strndup( (const char*)p_data, n );
  73         RM(n);
  74
  75         EnsureUTF8( psz );
  76
  77 #define IF_EXTRACT(txt,var) \
  78     if( !strncasecmp(psz, txt, strlen(txt)) ) \
  79     { \
  80         const char *oldval = vlc_meta_Get( p_meta, vlc_meta_ ## var ); \
  81         if( oldval ) \
  82         { \
  83             char * newval; \
  84             if( asprintf( &newval, "%s,%s", oldval, &psz[strlen(txt)] ) == -1 ) \
  85                 newval = NULL; \
  86             vlc_meta_Set( p_meta, vlc_meta_ ## var, newval ); \
  87             free( newval ); \
  88         } \
  89         else \
  90             vlc_meta_Set( p_meta, vlc_meta_ ## var, &psz[strlen(txt)] ); \
  91     }
  92         IF_EXTRACT("TITLE=", Title )
  93         else IF_EXTRACT("ALBUM=", Album )
  94         else IF_EXTRACT("TRACKNUMBER=", TrackNumber )
  95         else IF_EXTRACT("ARTIST=", Artist )
  96         else IF_EXTRACT("COPYRIGHT=", Copyright )
  97         else IF_EXTRACT("DESCRIPTION=", Description )
  98         else IF_EXTRACT("GENRE=", Genre )
  99         else IF_EXTRACT("DATE=", Date )
 100         else if( strchr( psz, '=' ) )
 101         {
 102             /* generic (PERFORMER/LICENSE/ORGANIZATION/LOCATION/CONTACT/ISRC,
 103              * undocumented tags and replay gain ) */
 104             char *p = strchr( psz, '=' );
 105             *p++ = '\0';
 106             vlc_meta_AddExtra( p_meta, psz, p );
 107         }
 108 #undef IF_EXTRACT
 109         free( psz );
 110     }
 111 #undef RM
 112 }
 113