D12156: implement reading of rating tag

[Alexander Stippich]

astippich added a comment.


  Those formulas didn't work with newly added tests with values from Winamp, Windows Media Player and MediaMonkey. I calculated a linear regression line and this one seems to work with some special case handling

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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