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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
/*
* 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
#define ID3v2_PRIV_METADATA_PREFIX "id3v2_priv."
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 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;
typedef struct ID3v2ExtraMetaPRIV {
uint8_t *owner;
uint8_t *data;
uint32_t datasize;
} ID3v2ExtraMetaPRIV;
typedef struct ID3v2ExtraMetaCHAP {
uint8_t *element_id;
uint32_t start, end;
AVDictionary *meta;
} ID3v2ExtraMetaCHAP;
typedef struct ID3v2ExtraMeta {
const char *tag;
struct ID3v2ExtraMeta *next;
union {
ID3v2ExtraMetaAPIC apic;
ID3v2ExtraMetaCHAP chap;
ID3v2ExtraMetaGEOB geob;
ID3v2ExtraMetaPRIV priv;
} data;
} ID3v2ExtraMeta;
/**
* 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 into specified dictionary and retrieve supported extra metadata.
*
* @param metadata Parsed metadata is stored here
* @param[out] 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_dict(AVIOContext *pb, AVDictionary **metadata, const char *magic, ID3v2ExtraMeta **extra_meta);
/**
* Read an ID3v2 tag, including supported extra metadata.
*
* Data is read from and stored to AVFormatContext.
*
* @param[out] 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
* @param[opt] max_search_search restrict ID3 magic number search (bytes from start)
*/
void ff_id3v2_read(AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta,
unsigned int max_search_size);
/**
* 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, int padding_bytes);
/**
* 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);
/**
* Create chapters for all CHAP tags found in the ID3v2 header.
*/
int ff_id3v2_parse_chapters(AVFormatContext *s, ID3v2ExtraMeta *extra_meta);
/**
* Parse PRIV tags into a dictionary. The PRIV owner is the metadata key. The
* PRIV data is the value, with non-printable characters escaped.
*/
int ff_id3v2_parse_priv_dict(AVDictionary **d, ID3v2ExtraMeta *extra_meta);
/**
* Add metadata for all PRIV tags in the ID3v2 header. The PRIV owner is the
* metadata key. The PRIV data is the value, with non-printable characters
* escaped.
*/
int ff_id3v2_parse_priv(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 * const ff_id3v2_picture_types[21];
#endif /* AVFORMAT_ID3V2_H */
|
