SAO_MERGE_UP     1152 source/encoder/frameencoder.cpp                 int mergeUp = !ctu->m_bFirstRowInSlice && saoParam->ctuParam[0][cuAddr].mergeMode == SAO_MERGE_UP;
SAO_MERGE_UP     1347 source/encoder/sao.cpp                 SaoMergeMode mergeMode = mergeIdx ? SAO_MERGE_UP : SAO_MERGE_LEFT;