id3v2.c File Reference

ID3v2 header parser. More...

#include "config.h"
#include "libavutil/avstring.h"
#include "libavutil/dict.h"
#include "libavutil/intreadwrite.h"
#include "avio_internal.h"
#include "internal.h"
#include "id3v1.h"
#include "id3v2.h"

Go to the source code of this file.

Data Structures
struct	ID3v2EMFunc

Functions
int	ff_id3v2_match (const uint8_t *buf, const char *magic)
	Detect ID3v2 Header.
int	ff_id3v2_tag_len (const uint8_t *buf)
	Get the length of an ID3v2 tag.
static unsigned int	get_size (AVIOContext *s, int len)
static unsigned int	size_to_syncsafe (unsigned int size)
static int	is_tag (const char *buf, unsigned int len)
static int	check_tag (AVIOContext *s, int offset, unsigned int len)
	Return 1 if the tag of length len at the given offset is valid, 0 if not, -1 on error.
static void	free_geobtag (void *obj)
	Free GEOB type extra metadata.
static int	decode_str (AVFormatContext *s, AVIOContext *pb, int encoding, uint8_t **dst, int *maxread)
	Decode characters to UTF-8 according to encoding type.
static void	read_ttag (AVFormatContext *s, AVIOContext *pb, int taglen, AVDictionary **metadata, const char *key)
	Parse a text tag.
static void	read_geobtag (AVFormatContext *s, AVIOContext *pb, int taglen, char *tag, ID3v2ExtraMeta **extra_meta, int isv34)
	Parse GEOB tag into a ID3v2ExtraMetaGEOB struct.
static int	is_number (const char *str)
static AVDictionaryEntry *	get_date_tag (AVDictionary *m, const char *tag)
static void	merge_date (AVDictionary **m)
static void	free_apic (void *obj)
static void	read_apic (AVFormatContext *s, AVIOContext *pb, int taglen, char *tag, ID3v2ExtraMeta **extra_meta, int isv34)
static void	read_chapter (AVFormatContext *s, AVIOContext *pb, int len, char *ttag, ID3v2ExtraMeta **extra_meta, int isv34)
static void	free_priv (void *obj)
static void	read_priv (AVFormatContext *s, AVIOContext *pb, int taglen, char *tag, ID3v2ExtraMeta **extra_meta, int isv34)
static const ID3v2EMFunc *	get_extra_meta_func (const char *tag, int isv34)
	Get the corresponding ID3v2EMFunc struct for a tag.
static void	id3v2_parse (AVIOContext *pb, AVDictionary **metadata, AVFormatContext *s, int len, uint8_t version, uint8_t flags, ID3v2ExtraMeta **extra_meta)
static void	id3v2_read_internal (AVIOContext *pb, AVDictionary **metadata, AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta, int64_t max_search_size)
void	ff_id3v2_read_dict (AVIOContext *pb, AVDictionary **metadata, const char *magic, ID3v2ExtraMeta **extra_meta)
	Read an ID3v2 tag into specified dictionary and retrieve supported extra metadata.
void	ff_id3v2_read (AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta, unsigned int max_search_size)
	Read an ID3v2 tag, including supported extra metadata and chapters.
void	ff_id3v2_free_extra_meta (ID3v2ExtraMeta **extra_meta)
	Free memory allocated parsing special (non-text) metadata.
int	ff_id3v2_parse_apic (AVFormatContext *s, ID3v2ExtraMeta **extra_meta)
	Create a stream for each APIC (attached picture) extracted from the ID3v2 header.

Variables
const AVMetadataConv	ff_id3v2_34_metadata_conv []
const AVMetadataConv	ff_id3v2_4_metadata_conv []
static const AVMetadataConv	id3v2_2_metadata_conv []
const char	ff_id3v2_tags [][4]
	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.
const char	ff_id3v2_4_tags [][4]
	ID3v2.4-only text information frames.
const char	ff_id3v2_3_tags [][4]
	ID3v2.3-only text information frames.
const char *	ff_id3v2_picture_types [21]
const CodecMime	ff_id3v2_mime_tags []
static const ID3v2EMFunc	id3v2_extra_meta_funcs []

Detailed Description

ID3v2 header parser.

Specifications available at: http://id3.org/Developer_Information

Definition in file id3v2.c.

Function Documentation

int ff_id3v2_match	(	const uint8_t *	buf,
		const char *	magic
	)

Detect ID3v2 Header.

Parameters

buf	must be ID3v2_HEADER_SIZE byte long
magic	magic bytes to identify the header. If in doubt, use ID3v2_DEFAULT_MAGIC.

Definition at line 140 of file id3v2.c.

Referenced by av_probe_input_format3(), id3v2_read_internal(), intercept_id3(), mp3_read_probe(), and oma_read_probe().

int ff_id3v2_tag_len

(

const uint8_t *

buf

)

Get the length of an ID3v2 tag.

Parameters

buf	must be ID3v2_HEADER_SIZE bytes long and point to the start of an already detected ID3v2 tag

Definition at line 153 of file id3v2.c.

Referenced by av_probe_input_format3(), intercept_id3(), mp3_read_probe(), and oma_read_probe().

static unsigned int get_size ( AVIOContext *  s, int  len  )

static

Definition at line 165 of file id3v2.c.

Referenced by id3v2_parse().

static unsigned int size_to_syncsafe ( unsigned int  size )

static

Definition at line 173 of file id3v2.c.

Referenced by id3v2_parse().

static int is_tag ( const char *  buf, unsigned int  len  )

static

Definition at line 183 of file id3v2.c.

Referenced by check_tag().

static int check_tag ( AVIOContext *  s, int  offset, unsigned int  len  )

static

Return 1 if the tag of length len at the given offset is valid, 0 if not, -1 on error.

Definition at line 201 of file id3v2.c.

Referenced by id3v2_parse().

static void free_geobtag ( void *  obj )

static

Free GEOB type extra metadata.

Definition at line 218 of file id3v2.c.

Referenced by read_geobtag().

static int decode_str ( AVFormatContext *  s, AVIOContext *  pb, int  encoding, uint8_t **  dst, int *  maxread  )

static

Decode characters to UTF-8 according to encoding type.

The decoded buffer is always null terminated. Stop reading when either *maxread bytes are read from pb or U+0000 character is found.

Parameters

dst	Pointer where the address of the buffer with the decoded bytes is stored. Buffer must be freed by caller.
maxread	Pointer to maximum number of characters to read from the AVIOContext. After execution the value is decremented by the number of bytes actually read.

Returns

0 if no error occurred, dst is uninitialized on error

Definition at line 240 of file id3v2.c.

Referenced by read_apic(), read_chapter(), read_geobtag(), read_priv(), and read_ttag().

static void read_ttag ( AVFormatContext *  s, AVIOContext *  pb, int  taglen, AVDictionary **  metadata, const char *  key  )

static

Parse a text tag.

Definition at line 317 of file id3v2.c.

Referenced by id3v2_parse(), and read_chapter().

static void read_geobtag ( AVFormatContext *  s, AVIOContext *  pb, int  taglen, char *  tag, ID3v2ExtraMeta **  extra_meta, int  isv34  )

static

Parse GEOB tag into a ID3v2ExtraMetaGEOB struct.

Definition at line 359 of file id3v2.c.

static int is_number ( const char *  str )

static

Definition at line 435 of file id3v2.c.

Referenced by get_date_tag().

static AVDictionaryEntry* get_date_tag ( AVDictionary *  m, const char *  tag  )

static

Definition at line 442 of file id3v2.c.

Referenced by merge_date().

static void merge_date ( AVDictionary **  m )

static

Definition at line 451 of file id3v2.c.

Referenced by id3v2_read_internal().

static void free_apic ( void *  obj )

static

Definition at line 483 of file id3v2.c.

Referenced by read_apic().

static void read_apic ( AVFormatContext *  s, AVIOContext *  pb, int  taglen, char *  tag, ID3v2ExtraMeta **  extra_meta, int  isv34  )

static

Definition at line 491 of file id3v2.c.

static void read_chapter ( AVFormatContext *  s, AVIOContext *  pb, int  len, char *  ttag, ID3v2ExtraMeta **  extra_meta, int  isv34  )

static

Definition at line 570 of file id3v2.c.

static void free_priv ( void *  obj )

static

Definition at line 625 of file id3v2.c.

Referenced by read_priv().

static void read_priv ( AVFormatContext *  s, AVIOContext *  pb, int  taglen, char *  tag, ID3v2ExtraMeta **  extra_meta, int  isv34  )

static

Definition at line 633 of file id3v2.c.

static const ID3v2EMFunc* get_extra_meta_func ( const char *  tag, int  isv34  )

static

Get the corresponding ID3v2EMFunc struct for a tag.

Parameters

isv34

Determines if v2.2 or v2.3/4 strings are used

Returns

A pointer to the ID3v2EMFunc struct if found, NULL otherwise.

Definition at line 691 of file id3v2.c.

Referenced by ff_id3v2_free_extra_meta(), and id3v2_parse().

static void id3v2_parse ( AVIOContext *  pb, AVDictionary **  metadata, AVFormatContext *  s, int  len, uint8_t  version, uint8_t  flags, ID3v2ExtraMeta **  extra_meta  )

static

Definition at line 705 of file id3v2.c.

Referenced by id3v2_read_internal().

static void id3v2_read_internal ( AVIOContext *  pb, AVDictionary **  metadata, AVFormatContext *  s, const char *  magic, ID3v2ExtraMeta **  extra_meta, int64_t  max_search_size  )

static

Definition at line 941 of file id3v2.c.

Referenced by ff_id3v2_read(), and ff_id3v2_read_dict().

void ff_id3v2_read_dict	(	AVIOContext *	pb,
		AVDictionary **	metadata,
		const char *	magic,
		ID3v2ExtraMeta **	extra_meta
	)

Read an ID3v2 tag into specified dictionary and retrieve supported extra metadata.

Chapters are not currently read by this variant.

Parameters

metadata	Parsed metadata is stored here
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

Definition at line 985 of file id3v2.c.

Referenced by parse_id3().

void ff_id3v2_read	(	AVFormatContext *	s,
		const char *	magic,
		ID3v2ExtraMeta **	extra_meta,
		unsigned int	max_search_size
	)

Read an ID3v2 tag, including supported extra metadata and chapters.

Data is read from and stored to AVFormatContext.

Parameters

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
opt]	max_search_search restrict ID3 magic number search (bytes from start)

Definition at line 991 of file id3v2.c.

Referenced by aiff_read_header(), avformat_open_input(), get_id3_tag(), oma_read_header(), parse_dsd_prop(), and read_id3().

void ff_id3v2_free_extra_meta

(

ID3v2ExtraMeta **

extra_meta

)

Free memory allocated parsing special (non-text) metadata.

Parameters

extra_meta

Pointer to a pointer to the head of a ID3v2ExtraMeta list, *extra_meta is set to NULL.

Definition at line 997 of file id3v2.c.

Referenced by aiff_read_header(), avformat_open_input(), free_playlist_list(), get_id3_tag(), handle_id3(), hls_read_header(), oma_read_header(), parse_dsd_prop(), and read_id3().

int ff_id3v2_parse_apic	(	AVFormatContext *	s,
		ID3v2ExtraMeta **	extra_meta
	)

Create a stream for each APIC (attached picture) extracted from the ID3v2 header.

Definition at line 1013 of file id3v2.c.

Referenced by aiff_read_header(), avformat_open_input(), get_id3_tag(), handle_id3(), hls_read_header(), parse_dsd_prop(), and read_id3().

Variable Documentation

const AVMetadataConv ff_id3v2_34_metadata_conv[]

Initial value:

= {
    { "TALB", "album"        },
    { "TCOM", "composer"     },
    { "TCON", "genre"        },
    { "TCOP", "copyright"    },
    { "TENC", "encoded_by"   },
    { "TIT2", "title"        },
    { "TLAN", "language"     },
    { "TPE1", "artist"       },
    { "TPE2", "album_artist" },
    { "TPE3", "performer"    },
    { "TPOS", "disc"         },
    { "TPUB", "publisher"    },
    { "TRCK", "track"        },
    { "TSSE", "encoder"      },
    { 0 }
}

Definition at line 43 of file id3v2.c.

Referenced by write_metadata().

const AVMetadataConv ff_id3v2_4_metadata_conv[]

Initial value:

= {
    { "TCMP", "compilation"   },
    { "TDRC", "date"          },
    { "TDRL", "date"          },
    { "TDEN", "creation_time" },
    { "TSOA", "album-sort"    },
    { "TSOP", "artist-sort"   },
    { "TSOT", "title-sort"    },
    { 0 }
}

Definition at line 61 of file id3v2.c.

Referenced by write_metadata().

const AVMetadataConv id3v2_2_metadata_conv[]

static

Initial value:

= {
    { "TAL", "album"        },
    { "TCO", "genre"        },
    { "TCP", "compilation"  },
    { "TT2", "title"        },
    { "TEN", "encoded_by"   },
    { "TP1", "artist"       },
    { "TP2", "album_artist" },
    { "TP3", "performer"    },
    { "TRK", "track"        },
    { 0 }
}

Definition at line 72 of file id3v2.c.

const char ff_id3v2_tags[][4]

Initial value:

= {
    "TALB", "TBPM", "TCOM", "TCON", "TCOP", "TDLY", "TENC", "TEXT",
    "TFLT", "TIT1", "TIT2", "TIT3", "TKEY", "TLAN", "TLEN", "TMED",
    "TOAL", "TOFN", "TOLY", "TOPE", "TOWN", "TPE1", "TPE2", "TPE3",
    "TPE4", "TPOS", "TPUB", "TRCK", "TRSN", "TRSO", "TSRC", "TSSE",
    { 0 },
}

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.

Definition at line 85 of file id3v2.c.

Referenced by write_metadata().

const char ff_id3v2_4_tags[][4]

Initial value:

= {
    "TDEN", "TDOR", "TDRC", "TDRL", "TDTG", "TIPL", "TMCL", "TMOO",
    "TPRO", "TSOA", "TSOP", "TSOT", "TSST",
    { 0 },
}

ID3v2.4-only text information frames.

Definition at line 93 of file id3v2.c.

Referenced by write_metadata().

const char ff_id3v2_3_tags[][4]

Initial value:

= {
    "TDAT", "TIME", "TORY", "TRDA", "TSIZ", "TYER",
    { 0 },
}

ID3v2.3-only text information frames.

Definition at line 99 of file id3v2.c.

Referenced by write_metadata().

const char* ff_id3v2_picture_types[21]

Initial value:

= {
    "Other",
    "32x32 pixels 'file icon'",
    "Other file icon",
    "Cover (front)",
    "Cover (back)",
    "Leaflet page",
    "Media (e.g. label side of CD)",
    "Lead artist/lead performer/soloist",
    "Artist/performer",
    "Conductor",
    "Band/Orchestra",
    "Composer",
    "Lyricist/text writer",
    "Recording Location",
    "During recording",
    "During performance",
    "Movie/video screen capture",
    "A bright coloured fish",
    "Illustration",
    "Band/artist logotype",
    "Publisher/Studio logotype",
}

Definition at line 104 of file id3v2.c.

Referenced by asf_read_picture(), ff_flac_parse_picture(), ff_id3v2_write_apic(), and read_apic().

const CodecMime ff_id3v2_mime_tags[]

Initial value:

= {
    { "image/gif",  AV_CODEC_ID_GIF   },
    { "image/jpeg", AV_CODEC_ID_MJPEG },
    { "image/jpg",  AV_CODEC_ID_MJPEG },
    { "image/png",  AV_CODEC_ID_PNG   },
    { "image/tiff", AV_CODEC_ID_TIFF  },
    { "image/bmp",  AV_CODEC_ID_BMP   },
    { "JPG",        AV_CODEC_ID_MJPEG }, 
    { "PNG",        AV_CODEC_ID_PNG   }, 
    { "",           AV_CODEC_ID_NONE  },
}

Definition at line 128 of file id3v2.c.

Referenced by asf_read_picture(), ff_flac_parse_picture(), ff_id3v2_write_apic(), query_codec(), and read_apic().

const ID3v2EMFunc id3v2_extra_meta_funcs[]

static

Initial value:

= {
    { "GEO", "GEOB", read_geobtag, free_geobtag },
    { "PIC", "APIC", read_apic,    free_apic    },
    { "CHAP","CHAP", read_chapter, NULL         },
    { "PRIV","PRIV", read_priv,    free_priv    },
    { NULL }
}

Definition at line 678 of file id3v2.c.