[Bug 225055] audio/mp3splt: the default encoding for ID3v2 tags should be UTF-16BE, not UTF-16LE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225055

--- Comment #9 from Anton Yuzhaninov <citrin+pr at citrin.ru> ---
(In reply to vas from comment #8)
text encoding description byte 0x01 mean UCS-2 (with BOM) in id3v2.3.0 and
UTF-16 with BOM in id3v2.4.0

For Basic Multilingual Plane (first 65536 code points) UTF-16 and UCS-2 have
the same byte representation. Symbols beyond BMP can't be represented in UCS-2
and hence in id3v2.3.0, but all popular languages are covered by BMP.

If some implementation supports only id3v2.3.0/UCS-2 then symbols outside BMP
(e.g. Unicode emoji) from id3v2.4.0 tags will be corrupted, but other symbols
should be decoded correctly. But I have no files with symbols outside BMP to
test it.

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