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* ID3v2 header parser
* Copyright (c) 2003 Fabrice Bellard
* This file is part of FFmpeg.
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#ifndef AVFORMAT_ID3V2_H
#define AVFORMAT_ID3V2_H
#include <stdint.h>
#include "avformat.h"
#include "metadata.h"
#define ID3v2_HEADER_SIZE 10
* Default magic bytes for ID3v2 header: "ID3"
#define ID3v2_DEFAULT_MAGIC "ID3"
#define ID3v2_FLAG_DATALEN 0x0001
#define ID3v2_FLAG_UNSYNCH 0x0002
#define ID3v2_FLAG_ENCRYPTION 0x0004
#define ID3v2_FLAG_COMPRESSION 0x0008
enum ID3v2Encoding {
ID3v2_ENCODING_ISO8859 = 0,
typedef struct ID3v2ExtraMeta {
const char *tag;
void *data;
struct ID3v2ExtraMeta *next;
} ID3v2ExtraMeta;
typedef struct ID3v2ExtraMetaGEOB {
uint32_t datasize;
uint8_t *mime_type;
uint8_t *file_name;
uint8_t *description;
uint8_t *data;
} ID3v2ExtraMetaGEOB;
* Detect ID3v2 Header.
* @param buf must be ID3v2_HEADER_SIZE byte long
* @param magic magic bytes to identify the header.
* If in doubt, use ID3v2_DEFAULT_MAGIC.
int ff_id3v2_match(const uint8_t *buf, const char *magic);
* Get the length of an ID3v2 tag.
* @param buf must be ID3v2_HEADER_SIZE bytes long and point to the start of an
* already detected ID3v2 tag
int ff_id3v2_tag_len(const uint8_t *buf);
* Read an ID3v2 tag (text tags only)
void ff_id3v2_read(AVFormatContext *s, const char *magic);
* Read an ID3v2 tag, including supported extra metadata (currently only GEOB)
* @param extra_meta If not NULL, extra metadata is parsed into a list of
* ID3v2ExtraMeta structs and *extra_meta points to the head of the list
void ff_id3v2_read_all(AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta);
* Write an ID3v2 tag.
* @param id3v2_version Subversion of ID3v2; supported values are 3 and 4
* @param magic magic bytes to identify the header
* If in doubt, use ID3v2_DEFAULT_MAGIC.
int ff_id3v2_write(struct AVFormatContext *s, int id3v2_version, const char *magic);
* Free memory allocated parsing special (non-text) metadata.
* @param extra_meta Pointer to a pointer to the head of a ID3v2ExtraMeta list, *extra_meta is set to NULL.
void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta);
extern const AVMetadataConv ff_id3v2_34_metadata_conv[];
extern const AVMetadataConv ff_id3v2_4_metadata_conv[];
* A list of text information frames allowed in both ID3 v2.3 and v2.4
extern const char ff_id3v2_tags[][4];
* ID3v2.4-only text information frames.
extern const char ff_id3v2_4_tags[][4];
* ID3v2.3-only text information frames.
extern const char ff_id3v2_3_tags[][4];
#endif /* AVFORMAT_ID3V2_H */
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