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Fix checkCRA() for field pictures

Nikolay Shostak requested to merge nikolay.shostak/VVCSoftware_VTM:fix-check-cra-for-fields into master

For sequence of field pictures this is valid:

  • [...]
  • POC=9 (picture from previous GOP)
  • POC=10 (CRA) -> has POC 9 as INACTIVE ref
  • POC=11 (TRAIL) -> has POC 9 as INACTIVE ref
  • POC=12 (RASL) -> refer to POC 9
  • POC=13 (RASL) -> refer to POC 9

checkCRA() fails on POC=11 (TRAIL) because it has INACTIVE ref from previous GOP. This would be OK for frame pictures.

But for sequence of field pictures it is allowed to have 1 TRAIL field picture between IRAP and leading pictures.

So TRAIL picture should be able to preserve ref pictures from previous GOP for RASL pictures.

Edited by Nikolay Shostak

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