Getting audio metadata
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You'll probably need to use an external library for that. There is a list for Id3 "here":http://id3.org/Implementations:
- "Id3lib":http://id3lib.sourceforge.net/
- "TagLib":http://taglib.github.io/
- "MAD Project":http://www.underbit.com/products/mad/
- "id3v2lib":https://github.com/larsbs/id3v2lib
- "libid3tag":http://cblfs.cross-lfs.org/index.php/Libid3tag