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Merge pull request #1685 from HaiboZhu/Debug_No_Deblocking_when_TotalMB_equals_to_0

Force NO deblocking when no MB decoded in current slice

--- a/codec/decoder/core/src/decode_slice.cpp

+++ b/codec/decoder/core/src/decode_slice.cpp

@@ -134,7 +134,8 @@

   pDeblockMb = WelsDeblockingMb;

-  if (1 == pSliceHeader->uiDisableDeblockingFilterIdc) {

+  if (1 == pSliceHeader->uiDisableDeblockingFilterIdc

+      || pCtx->pCurDqLayer->sLayerInfo.sSliceInLayer.iTotalMbInCurSlice <= 0) {

     return 0;//NO_SUPPORTED_FILTER_IDX

   } else {

     WelsDeblockingFilterSlice (pCtx, pDeblockMb);