Residual coding for transform skipped blocks

An apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:

• determine, for a conversion between a current block of a video and a bitstream of the video, whether to enable a level mapping operation or a level remapping operation based on whether a combination of an absolute value of a coefficient level and a remaining absolute value of the coefficient level is equal to zero, and wherein the level mapping operation or the level remapping operation includes changing between a first representation of a residual coefficient and a second representation of the residual coefficient based on neighboring residual coefficients of the residual coefficient;
• and
• perform the conversion by selectively using the level mapping operation or the level remapping operation based on the determination.

A non-transitory computer-readable storage medium storing instructions that cause a processor to:

• determine, for a conversion between a current block of a video and a bitstream of the video, whether to enable a level mapping operation or a level remapping operation based on whether a combination of an absolute value of a coefficient level and a remaining absolute value of the coefficient level is equal to zero, and wherein the level mapping operation or the level remapping operation includes changing between a first representation of a residual coefficient and a second representation of the residual coefficient based on neighboring residual coefficients of the residual coefficient;
• and
• perform the conversion by selectively using the level mapping operation or the level remapping operation based on the determination.

A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises:

• determining, for current block of a video, whether to enable a level mapping operation or a level remapping operation based on whether a combination of an absolute value of a coefficient level and a remaining absolute value of the coefficient level is equal to zero, and wherein the level mapping operation or the level remapping operation includes changing between a first representation of a residual coefficient and a second representation of the residual coefficient based on neighboring residual coefficients of the residual coefficient;
• and
• generating the bitstream by selectively using the level mapping operation or the level remapping operation based on the determining.