A method of video decoding for a decoder is provided. In the method, prediction information of a current block in a current picture is decoded from a coded video bitstream, where the prediction information is indicative of an inter prediction mode. Whether a filtering process is applied on the current block is determined, where the filtering process adjusts inter prediction samples of the current block based on neighboring reconstructed samples of the current block. A primary transform is thus performed for a transform block according to a pre-defined primary transform type based on that the filtering process is determined to be applied on the current block, where the transform block is partitioned from the current block.