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id3v1.c
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1 /*
2  * ID3v1 header parser
3  * Copyright (c) 2003 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "id3v1.h"
23 #include "libavcodec/avcodec.h"
24 #include "libavutil/dict.h"
25 
26 /* See Genre List at http://id3.org/id3v2.3.0 */
27 const char * const ff_id3v1_genre_str[ID3v1_GENRE_MAX + 1] = {
28  [0] = "Blues",
29  [1] = "Classic Rock",
30  [2] = "Country",
31  [3] = "Dance",
32  [4] = "Disco",
33  [5] = "Funk",
34  [6] = "Grunge",
35  [7] = "Hip-Hop",
36  [8] = "Jazz",
37  [9] = "Metal",
38  [10] = "New Age",
39  [11] = "Oldies",
40  [12] = "Other",
41  [13] = "Pop",
42  [14] = "R&B",
43  [15] = "Rap",
44  [16] = "Reggae",
45  [17] = "Rock",
46  [18] = "Techno",
47  [19] = "Industrial",
48  [20] = "Alternative",
49  [21] = "Ska",
50  [22] = "Death Metal",
51  [23] = "Pranks",
52  [24] = "Soundtrack",
53  [25] = "Euro-Techno",
54  [26] = "Ambient",
55  [27] = "Trip-Hop",
56  [28] = "Vocal",
57  [29] = "Jazz+Funk",
58  [30] = "Fusion",
59  [31] = "Trance",
60  [32] = "Classical",
61  [33] = "Instrumental",
62  [34] = "Acid",
63  [35] = "House",
64  [36] = "Game",
65  [37] = "Sound Clip",
66  [38] = "Gospel",
67  [39] = "Noise",
68  [40] = "AlternRock",
69  [41] = "Bass",
70  [42] = "Soul",
71  [43] = "Punk",
72  [44] = "Space",
73  [45] = "Meditative",
74  [46] = "Instrumental Pop",
75  [47] = "Instrumental Rock",
76  [48] = "Ethnic",
77  [49] = "Gothic",
78  [50] = "Darkwave",
79  [51] = "Techno-Industrial",
80  [52] = "Electronic",
81  [53] = "Pop-Folk",
82  [54] = "Eurodance",
83  [55] = "Dream",
84  [56] = "Southern Rock",
85  [57] = "Comedy",
86  [58] = "Cult",
87  [59] = "Gangsta",
88  [60] = "Top 40",
89  [61] = "Christian Rap",
90  [62] = "Pop/Funk",
91  [63] = "Jungle",
92  [64] = "Native American",
93  [65] = "Cabaret",
94  [66] = "New Wave",
95  [67] = "Psychadelic", /* sic, the misspelling is used in the specification */
96  [68] = "Rave",
97  [69] = "Showtunes",
98  [70] = "Trailer",
99  [71] = "Lo-Fi",
100  [72] = "Tribal",
101  [73] = "Acid Punk",
102  [74] = "Acid Jazz",
103  [75] = "Polka",
104  [76] = "Retro",
105  [77] = "Musical",
106  [78] = "Rock & Roll",
107  [79] = "Hard Rock",
108  [80] = "Folk",
109  [81] = "Folk-Rock",
110  [82] = "National Folk",
111  [83] = "Swing",
112  [84] = "Fast Fusion",
113  [85] = "Bebob",
114  [86] = "Latin",
115  [87] = "Revival",
116  [88] = "Celtic",
117  [89] = "Bluegrass",
118  [90] = "Avantgarde",
119  [91] = "Gothic Rock",
120  [92] = "Progressive Rock",
121  [93] = "Psychedelic Rock",
122  [94] = "Symphonic Rock",
123  [95] = "Slow Rock",
124  [96] = "Big Band",
125  [97] = "Chorus",
126  [98] = "Easy Listening",
127  [99] = "Acoustic",
128  [100] = "Humour",
129  [101] = "Speech",
130  [102] = "Chanson",
131  [103] = "Opera",
132  [104] = "Chamber Music",
133  [105] = "Sonata",
134  [106] = "Symphony",
135  [107] = "Booty Bass",
136  [108] = "Primus",
137  [109] = "Porn Groove",
138  [110] = "Satire",
139  [111] = "Slow Jam",
140  [112] = "Club",
141  [113] = "Tango",
142  [114] = "Samba",
143  [115] = "Folklore",
144  [116] = "Ballad",
145  [117] = "Power Ballad",
146  [118] = "Rhythmic Soul",
147  [119] = "Freestyle",
148  [120] = "Duet",
149  [121] = "Punk Rock",
150  [122] = "Drum Solo",
151  [123] = "A capella",
152  [124] = "Euro-House",
153  [125] = "Dance Hall",
154  [126] = "Goa",
155  [127] = "Drum & Bass",
156  [128] = "Club-House",
157  [129] = "Hardcore",
158  [130] = "Terror",
159  [131] = "Indie",
160  [132] = "BritPop",
161  [133] = "Negerpunk",
162  [134] = "Polsk Punk",
163  [135] = "Beat",
164  [136] = "Christian Gangsta",
165  [137] = "Heavy Metal",
166  [138] = "Black Metal",
167  [139] = "Crossover",
168  [140] = "Contemporary Christian",
169  [141] = "Christian Rock",
170  [142] = "Merengue",
171  [143] = "Salsa",
172  [144] = "Thrash Metal",
173  [145] = "Anime",
174  [146] = "JPop",
175  [147] = "SynthPop",
176 };
177 
178 static void get_string(AVFormatContext *s, const char *key,
179  const uint8_t *buf, int buf_size)
180 {
181  int i, c;
182  char *q, str[512], *first_free_space = NULL;
183 
184  q = str;
185  for(i = 0; i < buf_size; i++) {
186  c = buf[i];
187  if (c == '\0')
188  break;
189  if ((q - str) >= sizeof(str) - 1)
190  break;
191  if (c == ' ') {
192  if (!first_free_space)
193  first_free_space = q;
194  } else {
195  first_free_space = NULL;
196  }
197  *q++ = c;
198  }
199  *q = '\0';
200 
201  if (first_free_space)
202  *first_free_space = '\0';
203 
204  if (*str)
205  av_dict_set(&s->metadata, key, str, 0);
206 }
207 
208 /**
209  * Parse an ID3v1 tag
210  *
211  * @param buf ID3v1_TAG_SIZE long buffer containing the tag
212  */
213 static int parse_tag(AVFormatContext *s, const uint8_t *buf)
214 {
215  int genre;
216 
217  if (!(buf[0] == 'T' &&
218  buf[1] == 'A' &&
219  buf[2] == 'G'))
220  return -1;
221  get_string(s, "title", buf + 3, 30);
222  get_string(s, "artist", buf + 33, 30);
223  get_string(s, "album", buf + 63, 30);
224  get_string(s, "date", buf + 93, 4);
225  get_string(s, "comment", buf + 97, 30);
226  if (buf[125] == 0 && buf[126] != 0) {
227  av_dict_set_int(&s->metadata, "track", buf[126], 0);
228  }
229  genre = buf[127];
230  if (genre <= ID3v1_GENRE_MAX)
231  av_dict_set(&s->metadata, "genre", ff_id3v1_genre_str[genre], 0);
232  return 0;
233 }
234 
236 {
237  int ret;
239  int64_t filesize, position = avio_tell(s->pb);
240 
241  if (s->pb->seekable) {
242  /* XXX: change that */
243  filesize = avio_size(s->pb);
244  if (filesize > 128) {
245  avio_seek(s->pb, filesize - 128, SEEK_SET);
246  ret = avio_read(s->pb, buf, ID3v1_TAG_SIZE);
247  if (ret == ID3v1_TAG_SIZE) {
248  parse_tag(s, buf);
249  }
250  avio_seek(s->pb, position, SEEK_SET);
251  }
252  }
253 }
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:309
void ff_id3v1_read(AVFormatContext *s)
Read an ID3v1 tag.
Definition: id3v1.c:235
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:230
Format I/O context.
Definition: avformat.h:1327
Public dictionary API.
uint8_t
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:511
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:604
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1541
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:243
static void get_string(AVFormatContext *s, const char *key, const uint8_t *buf, int buf_size)
Definition: id3v1.c:178
Libavcodec external API header.
AVIOContext * pb
I/O context.
Definition: avformat.h:1369
void * buf
Definition: avisynth_c.h:690
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
static int parse_tag(AVFormatContext *s, const uint8_t *buf)
Parse an ID3v1 tag.
Definition: id3v1.c:213
static double c[64]
int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value, int flags)
Convenience wrapper for av_dict_set that converts the value to a string and stores it...
Definition: dict.c:147
#define ID3v1_TAG_SIZE
Definition: id3v1.h:27
#define ID3v1_GENRE_MAX
Definition: id3v1.h:29
const char *const ff_id3v1_genre_str[ID3v1_GENRE_MAX+1]
ID3v1 genres.
Definition: id3v1.c:27