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 void ff_id3v2_read(AVFormatContext *s)
54 uint8_t buf[ID3v2_HEADER_SIZE];
56 ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
57 if (ret != ID3v2_HEADER_SIZE)
59 if (ff_id3v2_match(buf)) {
60 /* parse ID3v2 header */
61 len = ((buf[6] & 0x7f) << 21) |
62 ((buf[7] & 0x7f) << 14) |
63 ((buf[8] & 0x7f) << 7) |
65 ff_id3v2_parse(s, len, buf[3], buf[5]);
67 url_fseek(s->pb, 0, SEEK_SET);
71 static unsigned int get_size(ByteIOContext *s, int len)
75 v = (v << 7) + (get_byte(s) & 0x7F);
79 static void read_ttag(AVFormatContext *s, int taglen, const char *key)
82 int len, dstlen = sizeof(dst) - 1;
89 taglen--; /* account for encoding type byte */
91 switch (get_byte(s->pb)) { /* encoding type */
93 case 0: /* ISO-8859-1 (0 - 255 maps directly into unicode) */
97 PUT_UTF8(get_byte(s->pb), tmp, if (q - dst < dstlen - 1) *q++ = tmp;)
103 len = FFMIN(taglen, dstlen - 1);
104 get_buffer(s->pb, dst, len);
109 if (!strcmp(key, "genre")
110 && (sscanf(dst, "(%d)", &genre) == 1 || sscanf(dst, "%d", &genre) == 1)
111 && genre <= ID3v1_GENRE_MAX)
112 av_strlcpy(dst, ff_id3v1_genre_str[genre], sizeof(dst));
115 av_metadata_set(&s->metadata, key, dst);
118 void ff_id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
129 reason = "compression";
148 reason = "unsynchronization";
152 if (isv34 && flags & 0x40) /* Extended header present, just skip over it */
153 url_fskip(s->pb, get_size(s->pb, 4));
155 while (len >= taghdrlen) {
157 tag = get_be32(s->pb);
158 tlen = get_size(s->pb, 4);
159 get_be16(s->pb); /* flags */
161 tag = get_be24(s->pb);
162 tlen = get_size(s->pb, 3);
164 len -= taghdrlen + tlen;
169 next = url_ftell(s->pb) + tlen;
172 case MKBETAG('T', 'I', 'T', '2'):
173 case MKBETAG(0, 'T', 'T', '2'):
174 read_ttag(s, tlen, "title");
176 case MKBETAG('T', 'P', 'E', '1'):
177 case MKBETAG(0, 'T', 'P', '1'):
178 read_ttag(s, tlen, "author");
180 case MKBETAG('T', 'A', 'L', 'B'):
181 case MKBETAG(0, 'T', 'A', 'L'):
182 read_ttag(s, tlen, "album");
184 case MKBETAG('T', 'C', 'O', 'N'):
185 case MKBETAG(0, 'T', 'C', 'O'):
186 read_ttag(s, tlen, "genre");
188 case MKBETAG('T', 'C', 'O', 'P'):
189 case MKBETAG(0, 'T', 'C', 'R'):
190 read_ttag(s, tlen, "copyright");
192 case MKBETAG('T', 'R', 'C', 'K'):
193 case MKBETAG(0, 'T', 'R', 'K'):
194 read_ttag(s, tlen, "track");
197 /* padding, skip to end */
198 url_fskip(s->pb, len);
202 /* Skip to end of tag */
203 url_fseek(s->pb, next, SEEK_SET);
206 if (version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
207 url_fskip(s->pb, 10);
211 av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
212 url_fskip(s->pb, len);