3 * Copyright (c) 2003 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "libavutil/avstring.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/dict.h"
32 static int id3v1_set_string(AVFormatContext *s, const char *key,
33 uint8_t *buf, int buf_size)
35 AVDictionaryEntry *tag;
36 if ((tag = av_dict_get(s->metadata, key, NULL, 0)))
37 av_strlcpy(buf, tag->value, buf_size);
41 static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
43 AVDictionaryEntry *tag;
46 memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
50 count += id3v1_set_string(s, "TIT2", buf + 3, 30); //title
51 count += id3v1_set_string(s, "TPE1", buf + 33, 30); //author|artist
52 count += id3v1_set_string(s, "TALB", buf + 63, 30); //album
53 count += id3v1_set_string(s, "TDRL", buf + 93, 4); //date
54 count += id3v1_set_string(s, "comment", buf + 97, 30);
55 if ((tag = av_dict_get(s->metadata, "TRCK", NULL, 0))) { //track
57 buf[126] = atoi(tag->value);
60 buf[127] = 0xFF; /* default to unknown genre */
61 if ((tag = av_dict_get(s->metadata, "TCON", NULL, 0))) { //genre
62 for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
63 if (!strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
75 static void id3v2_put_size(AVFormatContext *s, int size)
77 avio_w8(s->pb, size >> 21 & 0x7f);
78 avio_w8(s->pb, size >> 14 & 0x7f);
79 avio_w8(s->pb, size >> 7 & 0x7f);
80 avio_w8(s->pb, size & 0x7f);
83 static int string_is_ascii(const uint8_t *str)
85 while (*str && *str < 128) str++;
90 * Write a text frame with one (normal frames) or two (TXXX frames) strings
91 * according to encoding (only UTF-8 or UTF-16+BOM supported).
92 * @return number of bytes written or a negative error code.
94 static int id3v2_put_ttag(AVFormatContext *s, const char *str1, const char *str2,
95 uint32_t tag, enum ID3v2Encoding enc)
99 int (*put)(AVIOContext*, const char*);
100 AVIOContext *dyn_buf;
101 if (avio_open_dyn_buf(&dyn_buf) < 0)
102 return AVERROR(ENOMEM);
104 /* check if the strings are ASCII-only and use UTF16 only if
106 if (enc == ID3v2_ENCODING_UTF16BOM && string_is_ascii(str1) &&
107 (!str2 || string_is_ascii(str2)))
108 enc = ID3v2_ENCODING_ISO8859;
110 avio_w8(dyn_buf, enc);
111 if (enc == ID3v2_ENCODING_UTF16BOM) {
112 avio_wl16(dyn_buf, 0xFEFF); /* BOM */
113 put = avio_put_str16le;
120 len = avio_close_dyn_buf(dyn_buf, &pb);
122 avio_wb32(s->pb, tag);
123 id3v2_put_size(s, len);
125 avio_write(s->pb, pb, len);
128 return len + ID3v2_HEADER_SIZE;
131 static int mp3_write_trailer(struct AVFormatContext *s)
133 uint8_t buf[ID3v1_TAG_SIZE];
135 /* write the id3v1 tag */
136 if (id3v1_create_tag(s, buf) > 0) {
137 avio_write(s->pb, buf, ID3v1_TAG_SIZE);
144 AVOutputFormat ff_mp2_muxer = {
146 NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
159 typedef struct MP3Context {
160 const AVClass *class;
164 static const AVOption options[] = {
165 { "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.",
166 offsetof(MP3Context, id3v2_version), FF_OPT_TYPE_INT, {.dbl = 4}, 3, 4, AV_OPT_FLAG_ENCODING_PARAM},
170 static const AVClass mp3_muxer_class = {
171 .class_name = "MP3 muxer",
172 .item_name = av_default_item_name,
174 .version = LIBAVUTIL_VERSION_INT,
177 static int id3v2_check_write_tag(AVFormatContext *s, AVDictionaryEntry *t, const char table[][4],
178 enum ID3v2Encoding enc)
183 if (t->key[0] != 'T' || strlen(t->key) != 4)
185 tag = AV_RB32(t->key);
186 for (i = 0; *table[i]; i++)
187 if (tag == AV_RB32(table[i]))
188 return id3v2_put_ttag(s, t->value, NULL, tag, enc);
193 * Write an ID3v2 header at beginning of stream
196 static int mp3_write_header(struct AVFormatContext *s)
198 MP3Context *mp3 = s->priv_data;
199 AVDictionaryEntry *t = NULL;
200 int totlen = 0, enc = mp3->id3v2_version == 3 ? ID3v2_ENCODING_UTF16BOM :
202 int64_t size_pos, cur_pos;
204 avio_wb32(s->pb, MKBETAG('I', 'D', '3', mp3->id3v2_version));
206 avio_w8(s->pb, 0); /* flags */
208 /* reserve space for size */
209 size_pos = avio_tell(s->pb);
212 ff_metadata_conv(&s->metadata, ff_id3v2_34_metadata_conv, NULL);
213 if (mp3->id3v2_version == 4)
214 ff_metadata_conv(&s->metadata, ff_id3v2_4_metadata_conv, NULL);
216 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
219 if ((ret = id3v2_check_write_tag(s, t, ff_id3v2_tags, enc)) > 0) {
223 if ((ret = id3v2_check_write_tag(s, t, mp3->id3v2_version == 3 ?
224 ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) {
229 /* unknown tag, write as TXXX frame */
230 if ((ret = id3v2_put_ttag(s, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0)
235 cur_pos = avio_tell(s->pb);
236 avio_seek(s->pb, size_pos, SEEK_SET);
237 id3v2_put_size(s, totlen);
238 avio_seek(s->pb, cur_pos, SEEK_SET);
243 AVOutputFormat ff_mp3_muxer = {
245 NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
255 .priv_class = &mp3_muxer_class,