/*
  * 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 "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,
 };
 

 /**

  * Detect ID3v2 Header.

  * @param buf   must be ID3v2_HEADER_SIZE byte long
  * @param magic magic bytes to identify the header, machine byte order.

  * 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
  */

 void ff_id3v2_read(AVFormatContext *s, const char *magic);

 extern const AVMetadataConv ff_id3v2_34_metadata_conv[];
 extern const AVMetadataConv ff_id3v2_4_metadata_conv[];
 extern const AVMetadataConv ff_id3v2_2_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];
 

 #endif /* AVFORMAT_ID3V2_H */