D12156: implement reading of rating tag

[Stefan Brüns]

bruns added inline comments.

INLINE COMMENTS

> astippich wrote in taglibextractor.cpp:222-234
> The thing here is that the most common implementation don't allow half star ratings. Only Mediamonkey does it and that diverges from the rest. Also, the values are not distributed equidistantly, but I'll look into a more flexible solution.

There is a "half interval" at the bottom and the top, every other interval is 64.

  rating = temp * 10 / 255 + 0.5;

should work reasonably well, or, if you prefer a smaller `0` interval:

  rating = temp * 9.5 / 255 + 0.99;

REPOSITORY
  R286 KFileMetaData

REVISION DETAIL
  https://phabricator.kde.org/D12156

To: astippich, mgallien, michaelh
Cc: bruns, #frameworks, ashaposhnikov, michaelh, astippich, spoorun
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