4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/avstring.h"
23 #include "libavutil/dict.h"
24 #include "libavutil/intreadwrite.h"
29 static void id3v2_put_size(AVFormatContext *s, int size)
31 avio_w8(s->pb, size >> 21 & 0x7f);
32 avio_w8(s->pb, size >> 14 & 0x7f);
33 avio_w8(s->pb, size >> 7 & 0x7f);
34 avio_w8(s->pb, size & 0x7f);
37 static int string_is_ascii(const uint8_t *str)
39 while (*str && *str < 128) str++;
44 * Write a text frame with one (normal frames) or two (TXXX frames) strings
45 * according to encoding (only UTF-8 or UTF-16+BOM supported).
46 * @return number of bytes written or a negative error code.
48 static int id3v2_put_ttag(AVFormatContext *s, const char *str1, const char *str2,
49 uint32_t tag, enum ID3v2Encoding enc)
53 int (*put)(AVIOContext*, const char*);
55 if (avio_open_dyn_buf(&dyn_buf) < 0)
56 return AVERROR(ENOMEM);
58 /* check if the strings are ASCII-only and use UTF16 only if
60 if (enc == ID3v2_ENCODING_UTF16BOM && string_is_ascii(str1) &&
61 (!str2 || string_is_ascii(str2)))
62 enc = ID3v2_ENCODING_ISO8859;
64 avio_w8(dyn_buf, enc);
65 if (enc == ID3v2_ENCODING_UTF16BOM) {
66 avio_wl16(dyn_buf, 0xFEFF); /* BOM */
67 put = avio_put_str16le;
74 len = avio_close_dyn_buf(dyn_buf, &pb);
76 avio_wb32(s->pb, tag);
77 id3v2_put_size(s, len);
79 avio_write(s->pb, pb, len);
82 return len + ID3v2_HEADER_SIZE;
85 static int id3v2_check_write_tag(AVFormatContext *s, AVDictionaryEntry *t, const char table[][4],
86 enum ID3v2Encoding enc)
91 if (t->key[0] != 'T' || strlen(t->key) != 4)
93 tag = AV_RB32(t->key);
94 for (i = 0; *table[i]; i++)
95 if (tag == AV_RB32(table[i]))
96 return id3v2_put_ttag(s, t->value, NULL, tag, enc);
100 static void id3v2_3_metadata_split_date(AVDictionary **pm)
102 AVDictionaryEntry *mtag = NULL;
103 AVDictionary *dst = NULL;
104 const char *key, *value;
105 char year[5] = {0}, day_month[5] = {0};
108 while ((mtag = av_dict_get(*pm, "", mtag, AV_DICT_IGNORE_SUFFIX))) {
110 if (!av_strcasecmp(key, "date")) {
111 /* split date tag using "YYYY-MM-DD" format into year and month/day segments */
114 while (value[i] >= '0' && value[i] <= '9') i++;
115 if (value[i] == '\0' || value[i] == '-') {
116 av_strlcpy(year, value, sizeof(year));
117 av_dict_set(&dst, "TYER", year, 0);
119 if (value[i] == '-' &&
120 value[i+1] >= '0' && value[i+1] <= '1' &&
121 value[i+2] >= '0' && value[i+2] <= '9' &&
123 value[i+4] >= '0' && value[i+4] <= '3' &&
124 value[i+5] >= '0' && value[i+5] <= '9' &&
125 (value[i+6] == '\0' || value[i+6] == ' ')) {
126 snprintf(day_month, sizeof(day_month), "%.2s%.2s", value + i + 4, value + i + 1);
127 av_dict_set(&dst, "TDAT", day_month, 0);
130 av_dict_set(&dst, key, value, 0);
132 av_dict_set(&dst, key, mtag->value, 0);
138 int ff_id3v2_write(struct AVFormatContext *s, int id3v2_version,
141 int64_t size_pos, cur_pos;
142 AVDictionaryEntry *t = NULL;
144 int totlen = 0, enc = id3v2_version == 3 ? ID3v2_ENCODING_UTF16BOM :
148 avio_wb32(s->pb, MKBETAG(magic[0], magic[1], magic[2], id3v2_version));
150 avio_w8(s->pb, 0); /* flags */
152 /* reserve space for size */
153 size_pos = avio_tell(s->pb);
156 ff_metadata_conv(&s->metadata, ff_id3v2_34_metadata_conv, NULL);
157 if (id3v2_version == 3)
158 id3v2_3_metadata_split_date(&s->metadata);
159 else if (id3v2_version == 4)
160 ff_metadata_conv(&s->metadata, ff_id3v2_4_metadata_conv, NULL);
162 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
165 if ((ret = id3v2_check_write_tag(s, t, ff_id3v2_tags, enc)) > 0) {
169 if ((ret = id3v2_check_write_tag(s, t, id3v2_version == 3 ?
170 ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) {
175 /* unknown tag, write as TXXX frame */
176 if ((ret = id3v2_put_ttag(s, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0)
181 cur_pos = avio_tell(s->pb);
182 avio_seek(s->pb, size_pos, SEEK_SET);
183 id3v2_put_size(s, totlen);
184 avio_seek(s->pb, cur_pos, SEEK_SET);