1 /*
2 ** Copyright (C) 2010-2017 Erik de Castro Lopo <erikd@mega-nerd.com>
3 **
4 ** This program is free software; you can redistribute it and/or modify
5 ** it under the terms of the GNU Lesser General Public License as published by
6 ** the Free Software Foundation; either version 2.1 of the License, or
7 ** (at your option) any later version.
8 **
9 ** This program is distributed in the hope that it will be useful,
10 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
11 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 ** GNU Lesser General Public License for more details.
13 **
14 ** You should have received a copy of the GNU Lesser General Public License
15 ** along with this program; if not, write to the Free Software
16 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #include "sfconfig.h"
20
21 #include <stdio.h>
22 #include <fcntl.h>
23 #include <string.h>
24 #include <ctype.h>
25
26 #include "sndfile.h"
27 #include "sfendian.h"
28 #include "common.h"
29 #include "id3.h"
30
31 #if HAVE_MPEG
32 #include <lame/lame.h>
33
34 struct id3v1_genre_handler_userdata
35 { int number ;
36 const char *ret ;
37 } ;
38
39 static void
id3v1_genre_handler(int number,const char * description,void * userdata)40 id3v1_genre_handler (int number, const char *description, void *userdata)
41 { struct id3v1_genre_handler_userdata *data = (struct id3v1_genre_handler_userdata *) userdata ;
42 if (data->number == number)
43 data->ret = description ;
44 }
45
46 const char *
id3_lookup_v1_genre(int number)47 id3_lookup_v1_genre (int number)
48 { struct id3v1_genre_handler_userdata data ;
49
50 data.number = number ;
51 data.ret = NULL ;
52 id3tag_genre_list (id3v1_genre_handler, &data) ;
53
54 return data.ret ;
55 }
56
57 #else /* HAVE_MPEG */
58
59 const char *
id3_lookup_v1_genre(int UNUSED (number))60 id3_lookup_v1_genre (int UNUSED (number))
61 { return NULL ;
62 }
63
64 #endif
65
66 int
id3_skip(SF_PRIVATE * psf)67 id3_skip (SF_PRIVATE * psf)
68 { unsigned char buf [10] ;
69 int offset ;
70
71 memset (buf, 0, sizeof (buf)) ;
72 psf_binheader_readf (psf, "pb", 0, buf, 10) ;
73
74 if (buf [0] == 'I' && buf [1] == 'D' && buf [2] == '3')
75 { psf->id3_header.minor_version = buf [3] ;
76 offset = buf [6] & 0x7f ;
77 offset = (offset << 7) | (buf [7] & 0x7f) ;
78 offset = (offset << 7) | (buf [8] & 0x7f) ;
79 offset = (offset << 7) | (buf [9] & 0x7f) ;
80
81 /*
82 ** ID3 count field is how many bytes of ID3v2 header FOLLOW the ten
83 ** bytes of header magic and offset, NOT the total ID3v2 header len.
84 */
85 psf->id3_header.len = offset + 10 ;
86 psf->id3_header.offset = psf->fileoffset ;
87
88 psf_log_printf (psf, " ID3v2.%d header length : %d\n----------------------------------------\n",
89 psf->id3_header.minor_version, psf->id3_header.len) ;
90
91 /* Never want to jump backwards in a file. */
92 if (offset < 0)
93 return 0 ;
94
95 /* Position ourselves at the new file offset. */
96 if (psf->fileoffset + psf->id3_header.len < psf->filelength)
97 { psf_binheader_readf (psf, "p!", psf->id3_header.len) ;
98 psf->fileoffset += psf->id3_header.len ;
99 return 1 ;
100 } ;
101 } ;
102
103 return 0 ;
104 } /* id3_skip */
105
106 const char *
id3_process_v2_genre(const char * genre)107 id3_process_v2_genre (const char *genre)
108 { int num = 0 ;
109 char c ;
110 const char *ptr ;
111
112 if (!genre)
113 return NULL ;
114
115 /*
116 ** Genre may require more processing.
117 **
118 ** It is allowed to have numeric references to the genre table from ID3v1.
119 ** We'll just convert the simple case here, strings of the format "(nnn)".
120 */
121 ptr = genre ;
122 if (ptr [0] == '(' && (c = *++ ptr) && isdigit (c))
123 { num = c - '0' ;
124 while ((c == *++ ptr) && isdigit (c))
125 num = num * 10 + (c - '0') ;
126 if (c == ')' && (c = *++ ptr) == '\0' && num < 256)
127 if ((ptr = id3_lookup_v1_genre (num)))
128 return ptr ;
129 } ;
130
131 return genre ;
132 } /* id3_process_v2_genre */
133