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10.2.3.6. MP3 ID3 Tags Implementation

The program supports both v1 (1.0 & 1.1) and v2 (2.3 & 2.4) ID3 tags. When the program reads the ID3 tags, it first tries to find v2 tags, and if they are not found, then v1 tags are used. Note, it depends on an author of a file which ID3 tags are set.

10.2.3.6.1. ID3 v2 implementation

The program handles only ISO-8859-1 text strings, at the moment it skips UNICODE information. Compressed tags are not decoded.

If several values are encountered for the same tag type, then the last value is used, but there are some exceptions to this rule. Handling of some fields has its specifics:

• UFID. The program collects the first UFID present. UFIDs which have test "http://www.id3.org/dummy/ufid.html" identification string are skipped.
• TCON (Genre).
  • v 2.3. Only the first parenthesis with numbers are expanded and resolved via the predefined list of genres into id3Genre variable. Other information is put into id3StringGenre variable.
  • v 2.4. Only the first numeric value is handled.
  • The program doesn't handle v2 specific types: "RX" and "CR".
• WXXX (URL). The program gets the first valid URL present.

10.2.3.6.2. List of ID3 related variables

The following information can be extracted from ID3 tags by the program:

Please see the description of all tags at ID3 website: http://www.id3.org.