4 * This file is part of Libav.
6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/dict.h"
25 #include "libavutil/intreadwrite.h"
30 static void id3v2_put_size(AVIOContext *pb, int size)
32 avio_w8(pb, size >> 21 & 0x7f);
33 avio_w8(pb, size >> 14 & 0x7f);
34 avio_w8(pb, size >> 7 & 0x7f);
35 avio_w8(pb, size & 0x7f);
38 static int string_is_ascii(const uint8_t *str)
40 while (*str && *str < 128) str++;
44 static void id3v2_encode_string(AVIOContext *pb, const uint8_t *str,
45 enum ID3v2Encoding enc)
47 int (*put)(AVIOContext*, const char*);
49 if (enc == ID3v2_ENCODING_UTF16BOM) {
50 avio_wl16(pb, 0xFEFF); /* BOM */
51 put = avio_put_str16le;
59 * Write a text frame with one (normal frames) or two (TXXX frames) strings
60 * according to encoding (only UTF-8 or UTF-16+BOM supported).
61 * @return number of bytes written or a negative error code.
63 static int id3v2_put_ttag(ID3v2EncContext *id3, AVIOContext *avioc, const char *str1, const char *str2,
64 uint32_t tag, enum ID3v2Encoding enc)
69 if (avio_open_dyn_buf(&dyn_buf) < 0)
70 return AVERROR(ENOMEM);
72 /* check if the strings are ASCII-only and use UTF16 only if
74 if (enc == ID3v2_ENCODING_UTF16BOM && string_is_ascii(str1) &&
75 (!str2 || string_is_ascii(str2)))
76 enc = ID3v2_ENCODING_ISO8859;
78 avio_w8(dyn_buf, enc);
79 id3v2_encode_string(dyn_buf, str1, enc);
81 id3v2_encode_string(dyn_buf, str2, enc);
82 len = avio_close_dyn_buf(dyn_buf, &pb);
84 avio_wb32(avioc, tag);
85 /* ID3v2.3 frame size is not synchsafe */
86 if (id3->version == 3)
87 avio_wb32(avioc, len);
89 id3v2_put_size(avioc, len);
91 avio_write(avioc, pb, len);
94 return len + ID3v2_HEADER_SIZE;
97 static int id3v2_check_write_tag(ID3v2EncContext *id3, AVIOContext *pb, AVDictionaryEntry *t,
98 const char table[][4], enum ID3v2Encoding enc)
103 if (t->key[0] != 'T' || strlen(t->key) != 4)
105 tag = AV_RB32(t->key);
106 for (i = 0; *table[i]; i++)
107 if (tag == AV_RB32(table[i]))
108 return id3v2_put_ttag(id3, pb, t->value, NULL, tag, enc);
112 void ff_id3v2_start(ID3v2EncContext *id3, AVIOContext *pb, int id3v2_version,
115 id3->version = id3v2_version;
117 avio_wb32(pb, MKBETAG(magic[0], magic[1], magic[2], id3v2_version));
119 avio_w8(pb, 0); /* flags */
121 /* reserve space for size */
122 id3->size_pos = avio_tell(pb);
126 int ff_id3v2_write_metadata(AVFormatContext *s, ID3v2EncContext *id3)
128 AVDictionaryEntry *t = NULL;
129 int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM :
132 ff_metadata_conv(&s->metadata, ff_id3v2_34_metadata_conv, NULL);
133 if (id3->version == 4)
134 ff_metadata_conv(&s->metadata, ff_id3v2_4_metadata_conv, NULL);
136 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
139 if ((ret = id3v2_check_write_tag(id3, s->pb, t, ff_id3v2_tags, enc)) > 0) {
143 if ((ret = id3v2_check_write_tag(id3, s->pb, t, id3->version == 3 ?
144 ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) {
149 /* unknown tag, write as TXXX frame */
150 if ((ret = id3v2_put_ttag(id3, s->pb, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0)
158 int ff_id3v2_write_apic(AVFormatContext *s, ID3v2EncContext *id3, AVPacket *pkt)
160 AVStream *st = s->streams[pkt->stream_index];
161 AVDictionaryEntry *e;
163 AVIOContext *dyn_buf;
165 const CodecMime *mime = ff_id3v2_mime_tags;
166 const char *mimetype = NULL, *desc = "";
167 int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM :
169 int i, len, type = 0;
171 /* get the mimetype*/
172 while (mime->id != AV_CODEC_ID_NONE) {
173 if (mime->id == st->codec->codec_id) {
174 mimetype = mime->str;
180 av_log(s, AV_LOG_ERROR, "No mimetype is known for stream %d, cannot "
181 "write an attached picture.\n", st->index);
182 return AVERROR(EINVAL);
185 /* get the picture type */
186 e = av_dict_get(st->metadata, "comment", NULL, 0);
187 for (i = 0; e && i < FF_ARRAY_ELEMS(ff_id3v2_picture_types); i++) {
188 if (strstr(ff_id3v2_picture_types[i], e->value) == ff_id3v2_picture_types[i]) {
194 /* get the description */
195 if ((e = av_dict_get(st->metadata, "title", NULL, 0)))
199 if (avio_open_dyn_buf(&dyn_buf) < 0)
200 return AVERROR(ENOMEM);
202 avio_w8(dyn_buf, enc);
203 avio_put_str(dyn_buf, mimetype);
204 avio_w8(dyn_buf, type);
205 id3v2_encode_string(dyn_buf, desc, enc);
206 avio_write(dyn_buf, pkt->data, pkt->size);
207 len = avio_close_dyn_buf(dyn_buf, &buf);
209 avio_wb32(s->pb, MKBETAG('A', 'P', 'I', 'C'));
210 if (id3->version == 3)
211 avio_wb32(s->pb, len);
213 id3v2_put_size(s->pb, len);
215 avio_write(s->pb, buf, len);
218 id3->len += len + ID3v2_HEADER_SIZE;
223 void ff_id3v2_finish(ID3v2EncContext *id3, AVIOContext *pb)
225 int64_t cur_pos = avio_tell(pb);
226 avio_seek(pb, id3->size_pos, SEEK_SET);
227 id3v2_put_size(pb, id3->len);
228 avio_seek(pb, cur_pos, SEEK_SET);
231 int ff_id3v2_write_simple(struct AVFormatContext *s, int id3v2_version,
234 ID3v2EncContext id3 = { 0 };
237 ff_id3v2_start(&id3, s->pb, id3v2_version, magic);
238 if ((ret = ff_id3v2_write_metadata(s, &id3)) < 0)
240 ff_id3v2_finish(&id3, s->pb);