3 * Copyright (c) 2003 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
24 #include "libavutil/avstring.h"
26 int ff_id3v2_match(const uint8_t *buf)
28 return buf[0] == 'I' &&
33 (buf[6] & 0x80) == 0 &&
34 (buf[7] & 0x80) == 0 &&
35 (buf[8] & 0x80) == 0 &&
39 int ff_id3v2_tag_len(const uint8_t * buf)
41 int len = ((buf[6] & 0x7f) << 21) +
42 ((buf[7] & 0x7f) << 14) +
43 ((buf[8] & 0x7f) << 7) +
47 len += ID3v2_HEADER_SIZE;
51 static unsigned int get_size(ByteIOContext *s, int len)
55 v = (v << 7) + (get_byte(s) & 0x7F);
59 static void read_ttag(AVFormatContext *s, int taglen, const char *key)
62 int len, dstlen = sizeof(dst) - 1;
69 taglen--; /* account for encoding type byte */
71 switch (get_byte(s->pb)) { /* encoding type */
73 case 0: /* ISO-8859-1 (0 - 255 maps directly into unicode) */
77 PUT_UTF8(get_byte(s->pb), tmp, if (q - dst < dstlen - 1) *q++ = tmp;)
83 len = FFMIN(taglen, dstlen - 1);
84 get_buffer(s->pb, dst, len);
89 if (!strcmp(key, "genre")
90 && (sscanf(dst, "(%d)", &genre) == 1 || sscanf(dst, "%d", &genre) == 1)
91 && genre <= ID3v1_GENRE_MAX)
92 av_strlcpy(dst, ff_id3v1_genre_str[genre], sizeof(dst));
95 av_metadata_set(&s->metadata, key, dst);
98 void ff_id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
109 reason = "compression";
128 reason = "unsynchronization";
132 if (isv34 && flags & 0x40) /* Extended header present, just skip over it */
133 url_fskip(s->pb, get_size(s->pb, 4));
135 while (len >= taghdrlen) {
137 tag = get_be32(s->pb);
138 tlen = get_size(s->pb, 4);
139 get_be16(s->pb); /* flags */
141 tag = get_be24(s->pb);
142 tlen = get_size(s->pb, 3);
144 len -= taghdrlen + tlen;
149 next = url_ftell(s->pb) + tlen;
152 case MKBETAG('T', 'I', 'T', '2'):
153 case MKBETAG(0, 'T', 'T', '2'):
154 read_ttag(s, tlen, "title");
156 case MKBETAG('T', 'P', 'E', '1'):
157 case MKBETAG(0, 'T', 'P', '1'):
158 read_ttag(s, tlen, "author");
160 case MKBETAG('T', 'A', 'L', 'B'):
161 case MKBETAG(0, 'T', 'A', 'L'):
162 read_ttag(s, tlen, "album");
164 case MKBETAG('T', 'C', 'O', 'N'):
165 case MKBETAG(0, 'T', 'C', 'O'):
166 read_ttag(s, tlen, "genre");
168 case MKBETAG('T', 'C', 'O', 'P'):
169 case MKBETAG(0, 'T', 'C', 'R'):
170 read_ttag(s, tlen, "copyright");
172 case MKBETAG('T', 'R', 'C', 'K'):
173 case MKBETAG(0, 'T', 'R', 'K'):
174 read_ttag(s, tlen, "track");
177 /* padding, skip to end */
178 url_fskip(s->pb, len);
182 /* Skip to end of tag */
183 url_fseek(s->pb, next, SEEK_SET);
186 if (version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
187 url_fskip(s->pb, 10);
191 av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
192 url_fskip(s->pb, len);