summaryrefslogtreecommitdiff
path: root/libavformat/id3v2.h
blob: e893922133e1837d51077b07b6eb2ef3d5f269ec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
/*
 * 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
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * 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 "internal.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,
    ID3v2_ENCODING_UTF16BOM = 1,
    ID3v2_ENCODING_UTF16BE  = 2,
    ID3v2_ENCODING_UTF8     = 3,
};

typedef struct ID3v2EncContext {
    int      version;       ///< ID3v2 minor version, either 3 or 4
    int64_t size_pos;       ///< offset of the tag total size
    int          len;       ///< size of the tag written so far
} ID3v2EncContext;

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;

typedef struct ID3v2ExtraMetaAPIC {
    AVBufferRef *buf;
    const char  *type;
    uint8_t     *description;
    enum AVCodecID id;
} ID3v2ExtraMetaAPIC;

/**
 * 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, including supported extra metadata
 * @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(AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta);

/**
 * Initialize an ID3v2 tag.
 */
void ff_id3v2_start(ID3v2EncContext *id3, AVIOContext *pb, int id3v2_version,
                    const char *magic);

/**
 * Convert and write all global metadata from s into an ID3v2 tag.
 */
int ff_id3v2_write_metadata(AVFormatContext *s, ID3v2EncContext *id3);

/**
 * Write an attached picture from pkt into an ID3v2 tag.
 */
int ff_id3v2_write_apic(AVFormatContext *s, ID3v2EncContext *id3, AVPacket *pkt);

/**
 * Finalize an opened ID3v2 tag.
 */
void ff_id3v2_finish(ID3v2EncContext *id3, AVIOContext *pb);

/**
 * Write an ID3v2 tag containing all global metadata from s.
 * @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_simple(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);

/**
 * Create a stream for each APIC (attached picture) extracted from the
 * ID3v2 header.
 */
int ff_id3v2_parse_apic(AVFormatContext *s, 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
 * http://www.id3.org/id3v2.4.0-frames
 * http://www.id3.org/id3v2.4.0-changes
 */
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];

extern const CodecMime ff_id3v2_mime_tags[];

extern const char *ff_id3v2_picture_types[21];

#endif /* AVFORMAT_ID3V2_H */