Revert r19149 "Disable native Vorbis encoder"
[libav.git] / libavformat / id3v2.c
CommitLineData
2ea512a6
AC
1/*
2 * ID3v2 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 "id3v2.h"
75411182
PD
23#include "id3v1.h"
24#include "libavutil/avstring.h"
2ea512a6
AC
25
26int ff_id3v2_match(const uint8_t *buf)
27{
7d7b8c32
DB
28 return buf[0] == 'I' &&
29 buf[1] == 'D' &&
30 buf[2] == '3' &&
31 buf[3] != 0xff &&
32 buf[4] != 0xff &&
33 (buf[6] & 0x80) == 0 &&
34 (buf[7] & 0x80) == 0 &&
35 (buf[8] & 0x80) == 0 &&
1d4b1bf2 36 (buf[9] & 0x80) == 0;
2ea512a6 37}
ac3ef4a4
AC
38
39int ff_id3v2_tag_len(const uint8_t * buf)
40{
41 int len = ((buf[6] & 0x7f) << 21) +
7d7b8c32
DB
42 ((buf[7] & 0x7f) << 14) +
43 ((buf[8] & 0x7f) << 7) +
44 (buf[9] & 0x7f) +
45 ID3v2_HEADER_SIZE;
ac3ef4a4
AC
46 if (buf[5] & 0x10)
47 len += ID3v2_HEADER_SIZE;
48 return len;
49}
75411182 50
50fcd5be
PD
51void ff_id3v2_read(AVFormatContext *s)
52{
53 int len, ret;
54 uint8_t buf[ID3v2_HEADER_SIZE];
55
56 ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
57 if (ret != ID3v2_HEADER_SIZE)
58 return;
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) |
64 (buf[9] & 0x7f);
65 ff_id3v2_parse(s, len, buf[3], buf[5]);
66 } else {
67 url_fseek(s->pb, 0, SEEK_SET);
68 }
69}
70
75411182
PD
71static unsigned int get_size(ByteIOContext *s, int len)
72{
7d7b8c32
DB
73 int v = 0;
74 while (len--)
75 v = (v << 7) + (get_byte(s) & 0x7F);
75411182
PD
76 return v;
77}
78
79static void read_ttag(AVFormatContext *s, int taglen, const char *key)
80{
81 char *q, dst[512];
82 int len, dstlen = sizeof(dst) - 1;
83 unsigned genre;
84
7d7b8c32
DB
85 dst[0] = 0;
86 if (taglen < 1)
75411182
PD
87 return;
88
89 taglen--; /* account for encoding type byte */
90
7d7b8c32 91 switch (get_byte(s->pb)) { /* encoding type */
75411182
PD
92
93 case 0: /* ISO-8859-1 (0 - 255 maps directly into unicode) */
94 q = dst;
7d7b8c32 95 while (taglen--) {
75411182
PD
96 uint8_t tmp;
97 PUT_UTF8(get_byte(s->pb), tmp, if (q - dst < dstlen - 1) *q++ = tmp;)
98 }
99 *q = '\0';
100 break;
101
102 case 3: /* UTF-8 */
7d7b8c32 103 len = FFMIN(taglen, dstlen - 1);
75411182
PD
104 get_buffer(s->pb, dst, len);
105 dst[len] = 0;
106 break;
107 }
108
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));
113
114 if (*dst)
115 av_metadata_set(&s->metadata, key, dst);
116}
117
118void ff_id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
119{
120 int isv34, tlen;
121 uint32_t tag;
122 int64_t next;
123 int taghdrlen;
124 const char *reason;
125
7d7b8c32 126 switch (version) {
75411182 127 case 2:
7d7b8c32 128 if (flags & 0x40) {
75411182
PD
129 reason = "compression";
130 goto error;
131 }
132 isv34 = 0;
133 taghdrlen = 6;
134 break;
135
136 case 3:
137 case 4:
138 isv34 = 1;
139 taghdrlen = 10;
140 break;
141
142 default:
143 reason = "version";
144 goto error;
145 }
146
7d7b8c32 147 if (flags & 0x80) {
75411182
PD
148 reason = "unsynchronization";
149 goto error;
150 }
151
7d7b8c32 152 if (isv34 && flags & 0x40) /* Extended header present, just skip over it */
75411182
PD
153 url_fskip(s->pb, get_size(s->pb, 4));
154
7d7b8c32
DB
155 while (len >= taghdrlen) {
156 if (isv34) {
75411182 157 tag = get_be32(s->pb);
47f42aec 158 tlen = get_be32(s->pb);
75411182
PD
159 get_be16(s->pb); /* flags */
160 } else {
161 tag = get_be24(s->pb);
1cd44221 162 tlen = get_be24(s->pb);
75411182
PD
163 }
164 len -= taghdrlen + tlen;
165
7d7b8c32 166 if (len < 0)
75411182
PD
167 break;
168
169 next = url_ftell(s->pb) + tlen;
170
7d7b8c32 171 switch (tag) {
75411182
PD
172 case MKBETAG('T', 'I', 'T', '2'):
173 case MKBETAG(0, 'T', 'T', '2'):
174 read_ttag(s, tlen, "title");
175 break;
176 case MKBETAG('T', 'P', 'E', '1'):
177 case MKBETAG(0, 'T', 'P', '1'):
178 read_ttag(s, tlen, "author");
179 break;
180 case MKBETAG('T', 'A', 'L', 'B'):
181 case MKBETAG(0, 'T', 'A', 'L'):
182 read_ttag(s, tlen, "album");
183 break;
184 case MKBETAG('T', 'C', 'O', 'N'):
185 case MKBETAG(0, 'T', 'C', 'O'):
186 read_ttag(s, tlen, "genre");
187 break;
188 case MKBETAG('T', 'C', 'O', 'P'):
189 case MKBETAG(0, 'T', 'C', 'R'):
190 read_ttag(s, tlen, "copyright");
191 break;
192 case MKBETAG('T', 'R', 'C', 'K'):
193 case MKBETAG(0, 'T', 'R', 'K'):
194 read_ttag(s, tlen, "track");
195 break;
196 case 0:
197 /* padding, skip to end */
198 url_fskip(s->pb, len);
199 len = 0;
200 continue;
201 }
202 /* Skip to end of tag */
203 url_fseek(s->pb, next, SEEK_SET);
204 }
205
7d7b8c32 206 if (version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
75411182
PD
207 url_fskip(s->pb, 10);
208 return;
209
210 error:
211 av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
212 url_fskip(s->pb, len);
213}