Adaptive quantization step size in ccso filtering

An apparatus for video decoding, comprising:

• processing circuitry configured to determine reconstructed samples of a first color component in a filter support region of a current block;
• determine a quantization step size of a cross-component sample offset (CCSO) filter corresponding to the filter support region, wherein the quantization step size is separately set for each coding block, each video frame, or each video sequence;
• apply the CCSO filter to the reconstructed samples of the first color component in the filter support region, the CCSO filter having the determined quantization step size;
• and
• reconstruct samples of a second color component in the filter support region based on an output of the CCSO filter.

A method of processing visual media data, the method comprising:

• performing a conversion between a visual media file and a bitstream of visual media data according to a format rule, wherein
• the bitstream includes coded information of a current block,
• the format rule specifies that reconstructed samples of a first color component in a filter support region of the current block are determined;
• the format rule specifies that a quantization step size of a cross-component sample offset (CCSO) filter corresponding to the filter support region is determined, wherein the quantization step size is separately set for each coding block, each video frame, or each video sequence;
• the format rule specifies that the CCSO filter is applied to the reconstructed samples of the first color component in the filter support region, the CCSO filter having the determined quantization step size;
• and
• the format rule specifies that samples of a second color component in the filter support region are reconstructed from the bitstream based on an output of the CCSO filter.