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Fix multilayer with fields

Nikolay Shostak requested to merge nikolay.shostak/VVCSoftware_VTM:fix-layers-with-fields into master

Decoder expects that 2 fields of one frame are stored in pcListPic next to each other.

But in case of Multilayer there will be some distance between field pictures. For example:

  • POC0 (TopField) Layer0
  • POC0 (TopField) Layer1
  • POC0 (TopField) Layer2
  • POC1 (BottomField) Layer0
  • POC1 (BottomField) Layer1
  • POC1 (BottomField) Layer2

Decoder needs to search for a second field picture. It should belong to the same layer as the first field picture.

Also, POCs of first and second field are not necessary differ by one. So, I removed those checks

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