215 lines
6.3 KiB
C
215 lines
6.3 KiB
C
/*
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* ID3v2 header parser
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFORMAT_ID3V2_H
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#define AVFORMAT_ID3V2_H
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#include <stdint.h>
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#include "avformat.h"
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#include "internal.h"
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#include "metadata.h"
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#define ID3v2_HEADER_SIZE 10
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/**
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* Default magic bytes for ID3v2 header: "ID3"
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*/
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#define ID3v2_DEFAULT_MAGIC "ID3"
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#define ID3v2_FLAG_DATALEN 0x0001
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#define ID3v2_FLAG_UNSYNCH 0x0002
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#define ID3v2_FLAG_ENCRYPTION 0x0004
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#define ID3v2_FLAG_COMPRESSION 0x0008
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#define ID3v2_PRIV_METADATA_PREFIX "id3v2_priv."
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enum ID3v2Encoding {
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ID3v2_ENCODING_ISO8859 = 0,
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ID3v2_ENCODING_UTF16BOM = 1,
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ID3v2_ENCODING_UTF16BE = 2,
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ID3v2_ENCODING_UTF8 = 3,
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};
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typedef struct ID3v2EncContext {
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int version; ///< ID3v2 minor version, either 3 or 4
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int64_t size_pos; ///< offset of the tag total size
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int len; ///< size of the tag written so far
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} ID3v2EncContext;
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typedef struct ID3v2ExtraMetaGEOB {
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uint32_t datasize;
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uint8_t *mime_type;
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uint8_t *file_name;
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uint8_t *description;
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uint8_t *data;
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} ID3v2ExtraMetaGEOB;
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typedef struct ID3v2ExtraMetaAPIC {
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AVBufferRef *buf;
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const char *type;
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uint8_t *description;
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enum AVCodecID id;
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} ID3v2ExtraMetaAPIC;
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typedef struct ID3v2ExtraMetaPRIV {
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uint8_t *owner;
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uint8_t *data;
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uint32_t datasize;
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} ID3v2ExtraMetaPRIV;
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typedef struct ID3v2ExtraMetaCHAP {
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uint8_t *element_id;
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uint32_t start, end;
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AVDictionary *meta;
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} ID3v2ExtraMetaCHAP;
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typedef struct ID3v2ExtraMeta {
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const char *tag;
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struct ID3v2ExtraMeta *next;
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union {
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ID3v2ExtraMetaAPIC apic;
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ID3v2ExtraMetaCHAP chap;
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ID3v2ExtraMetaGEOB geob;
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ID3v2ExtraMetaPRIV priv;
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} data;
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} ID3v2ExtraMeta;
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/**
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* Detect ID3v2 Header.
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* @param buf must be ID3v2_HEADER_SIZE byte long
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* @param magic magic bytes to identify the header.
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* If in doubt, use ID3v2_DEFAULT_MAGIC.
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*/
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int ff_id3v2_match(const uint8_t *buf, const char *magic);
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/**
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* Get the length of an ID3v2 tag.
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* @param buf must be ID3v2_HEADER_SIZE bytes long and point to the start of an
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* already detected ID3v2 tag
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*/
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int ff_id3v2_tag_len(const uint8_t *buf);
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/**
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* Read an ID3v2 tag into specified dictionary and retrieve supported extra metadata.
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*
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* @param metadata Parsed metadata is stored here
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* @param extra_meta If not NULL, extra metadata is parsed into a list of
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* ID3v2ExtraMeta structs and *extra_meta points to the head of the list
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*/
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void ff_id3v2_read_dict(AVIOContext *pb, AVDictionary **metadata, const char *magic, ID3v2ExtraMeta **extra_meta);
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/**
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* Read an ID3v2 tag, including supported extra metadata.
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*
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* Data is read from and stored to AVFormatContext.
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*
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* @param extra_meta If not NULL, extra metadata is parsed into a list of
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* ID3v2ExtraMeta structs and *extra_meta points to the head of the list
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* @param[opt] max_search_search restrict ID3 magic number search (bytes from start)
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*/
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void ff_id3v2_read(AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta,
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unsigned int max_search_size);
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/**
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* Initialize an ID3v2 tag.
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*/
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void ff_id3v2_start(ID3v2EncContext *id3, AVIOContext *pb, int id3v2_version,
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const char *magic);
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/**
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* Convert and write all global metadata from s into an ID3v2 tag.
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*/
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int ff_id3v2_write_metadata(AVFormatContext *s, ID3v2EncContext *id3);
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/**
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* Write an attached picture from pkt into an ID3v2 tag.
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*/
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int ff_id3v2_write_apic(AVFormatContext *s, ID3v2EncContext *id3, AVPacket *pkt);
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/**
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* Finalize an opened ID3v2 tag.
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*/
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void ff_id3v2_finish(ID3v2EncContext *id3, AVIOContext *pb, int padding_bytes);
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/**
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* Write an ID3v2 tag containing all global metadata from s.
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* @param id3v2_version Subversion of ID3v2; supported values are 3 and 4
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* @param magic magic bytes to identify the header
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* If in doubt, use ID3v2_DEFAULT_MAGIC.
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*/
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int ff_id3v2_write_simple(struct AVFormatContext *s, int id3v2_version, const char *magic);
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/**
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* Free memory allocated parsing special (non-text) metadata.
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* @param extra_meta Pointer to a pointer to the head of a ID3v2ExtraMeta list, *extra_meta is set to NULL.
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*/
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void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta);
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/**
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* Create a stream for each APIC (attached picture) extracted from the
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* ID3v2 header.
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*/
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int ff_id3v2_parse_apic(AVFormatContext *s, ID3v2ExtraMeta *extra_meta);
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/**
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* Create chapters for all CHAP tags found in the ID3v2 header.
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*/
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int ff_id3v2_parse_chapters(AVFormatContext *s, ID3v2ExtraMeta *extra_meta);
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/**
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* Parse PRIV tags into a dictionary. The PRIV owner is the metadata key. The
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* PRIV data is the value, with non-printable characters escaped.
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*/
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int ff_id3v2_parse_priv_dict(AVDictionary **d, ID3v2ExtraMeta *extra_meta);
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/**
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* Add metadata for all PRIV tags in the ID3v2 header. The PRIV owner is the
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* metadata key. The PRIV data is the value, with non-printable characters
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* escaped.
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*/
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int ff_id3v2_parse_priv(AVFormatContext *s, ID3v2ExtraMeta *extra_meta);
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extern const AVMetadataConv ff_id3v2_34_metadata_conv[];
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extern const AVMetadataConv ff_id3v2_4_metadata_conv[];
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/**
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* A list of text information frames allowed in both ID3 v2.3 and v2.4
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* http://www.id3.org/id3v2.4.0-frames
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* http://www.id3.org/id3v2.4.0-changes
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*/
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extern const char ff_id3v2_tags[][4];
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/**
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* ID3v2.4-only text information frames.
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*/
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extern const char ff_id3v2_4_tags[][4];
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/**
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* ID3v2.3-only text information frames.
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*/
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extern const char ff_id3v2_3_tags[][4];
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extern const CodecMime ff_id3v2_mime_tags[];
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extern const char * const ff_id3v2_picture_types[21];
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#endif /* AVFORMAT_ID3V2_H */
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