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
27 #include "libavutil/intreadwrite.h"
28 #include "libavutil/opt.h"
30 static int id3v1_set_string(AVFormatContext *s, const char *key,
31 uint8_t *buf, int buf_size)
34 if ((tag = av_metadata_get(s->metadata, key, NULL, 0)))
35 strncpy(buf, tag->value, buf_size);
39 static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
44 memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
48 count += id3v1_set_string(s, "TIT2", buf + 3, 30); //title
49 count += id3v1_set_string(s, "TPE1", buf + 33, 30); //author|artist
50 count += id3v1_set_string(s, "TALB", buf + 63, 30); //album
51 count += id3v1_set_string(s, "TDRL", buf + 93, 4); //date
52 count += id3v1_set_string(s, "comment", buf + 97, 30);
53 if ((tag = av_metadata_get(s->metadata, "TRCK", NULL, 0))) { //track
55 buf[126] = atoi(tag->value);
58 buf[127] = 0xFF; /* default to unknown genre */
59 if ((tag = av_metadata_get(s->metadata, "TCON", NULL, 0))) { //genre
60 for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
61 if (!strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
73 static void id3v2_put_size(AVFormatContext *s, int size)
75 avio_w8(s->pb, size >> 21 & 0x7f);
76 avio_w8(s->pb, size >> 14 & 0x7f);
77 avio_w8(s->pb, size >> 7 & 0x7f);
78 avio_w8(s->pb, size & 0x7f);
81 static int string_is_ascii(const uint8_t *str)
83 while (*str && *str < 128) str++;
88 * Write a text frame with one (normal frames) or two (TXXX frames) strings
89 * according to encoding (only UTF-8 or UTF-16+BOM supported).
90 * @return number of bytes written or a negative error code.
92 static int id3v2_put_ttag(AVFormatContext *s, const char *str1, const char *str2,
93 uint32_t tag, enum ID3v2Encoding enc)
97 int (*put)(AVIOContext*, const char*);
99 if (url_open_dyn_buf(&dyn_buf) < 0)
100 return AVERROR(ENOMEM);
102 /* check if the strings are ASCII-only and use UTF16 only if
104 if (enc == ID3v2_ENCODING_UTF16BOM && string_is_ascii(str1) &&
105 (!str2 || string_is_ascii(str2)))
106 enc = ID3v2_ENCODING_ISO8859;
108 avio_w8(dyn_buf, enc);
109 if (enc == ID3v2_ENCODING_UTF16BOM) {
110 avio_wl16(dyn_buf, 0xFEFF); /* BOM */
111 put = avio_put_str16le;
118 len = url_close_dyn_buf(dyn_buf, &pb);
120 avio_wb32(s->pb, tag);
121 id3v2_put_size(s, len);
123 avio_write(s->pb, pb, len);
126 return len + ID3v2_HEADER_SIZE;
129 static int mp3_write_trailer(struct AVFormatContext *s)
131 uint8_t buf[ID3v1_TAG_SIZE];
133 /* write the id3v1 tag */
134 if (id3v1_create_tag(s, buf) > 0) {
135 avio_write(s->pb, buf, ID3v1_TAG_SIZE);
136 put_flush_packet(s->pb);
142 AVOutputFormat ff_mp2_muxer = {
144 NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
157 typedef struct MP3Context {
158 const AVClass *class;
162 static const AVOption options[] = {
163 { "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.",
164 offsetof(MP3Context, id3v2_version), FF_OPT_TYPE_INT, 4, 3, 4, AV_OPT_FLAG_ENCODING_PARAM},
168 static const AVClass mp3_muxer_class = {
170 av_default_item_name,
172 LIBAVUTIL_VERSION_INT,
175 static int id3v2_check_write_tag(AVFormatContext *s, AVMetadataTag *t, const char table[][4],
176 enum ID3v2Encoding enc)
181 if (t->key[0] != 'T' || strlen(t->key) != 4)
183 tag = AV_RB32(t->key);
184 for (i = 0; *table[i]; i++)
185 if (tag == AV_RB32(table[i]))
186 return id3v2_put_ttag(s, t->value, NULL, tag, enc);
191 * Write an ID3v2 header at beginning of stream
194 static int mp3_write_header(struct AVFormatContext *s)
196 MP3Context *mp3 = s->priv_data;
197 AVMetadataTag *t = NULL;
198 int totlen = 0, enc = mp3->id3v2_version == 3 ? ID3v2_ENCODING_UTF16BOM :
200 int64_t size_pos, cur_pos;
202 avio_wb32(s->pb, MKBETAG('I', 'D', '3', mp3->id3v2_version));
204 avio_w8(s->pb, 0); /* flags */
206 /* reserve space for size */
207 size_pos = avio_tell(s->pb);
210 ff_metadata_conv(&s->metadata, ff_id3v2_34_metadata_conv, NULL);
211 if (mp3->id3v2_version == 4)
212 ff_metadata_conv(&s->metadata, ff_id3v2_4_metadata_conv, NULL);
214 while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX))) {
217 if ((ret = id3v2_check_write_tag(s, t, ff_id3v2_tags, enc)) > 0) {
221 if ((ret = id3v2_check_write_tag(s, t, mp3->id3v2_version == 3 ?
222 ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) {
227 /* unknown tag, write as TXXX frame */
228 if ((ret = id3v2_put_ttag(s, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0)
233 cur_pos = avio_tell(s->pb);
234 avio_seek(s->pb, size_pos, SEEK_SET);
235 id3v2_put_size(s, totlen);
236 avio_seek(s->pb, cur_pos, SEEK_SET);
241 AVOutputFormat ff_mp3_muxer = {
243 NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
253 .priv_class = &mp3_muxer_class,