Residual coding constraint flag signaling

A method of video encoding, comprising:

• determining, by a processor, whether a residual coding tool is enabled for video data;
• encoding the video data in a bitstream using the residual coding tool based on whether the residual coding tool is enabled for the video data;
• when a total number of additional constraint syntax elements in a general constraint information (GCI) syntax structure for the video data in the bitstream is larger than zero, encoding a no transform skip residual coding Rice constraint flag in the GCI syntax structure for the video data in the bitstream, the no transform skip residual coding Rice constraint flag being associated with the residual coding tool;
• and
• encoding a first syntax element in the GCI syntax structure for the video data in the bitstream, the first syntax element indicating the total number of the additional constraint syntax elements in the GCI syntax structure, wherein
• the no transform skip residual coding Rice constraint flag in the GCI syntax structure is equal to 1 when the video data is encoded based on a default value of a transform skip residual coding Rice present in slice header flag that is associated with the residual coding tool.

A non-transitory computer-readable storage medium storing instructions which, when executed by a processor, cause the processor to perform an encoding method comprising:

• determining whether a residual coding tool is enabled for video data;
• encoding the video data in a bitstream using the residual coding tool based on whether the residual coding tool is enabled for the video data;
• when a total number of additional constraint syntax elements in a general constraint information (GCI) syntax structure for the video data in the bitstream is larger than zero, encoding a no transform skip residual coding Rice constraint flag in the GCI syntax structure for the video data in the bitstream, the no transform skip residual coding Rice constraint flag being associated with the residual coding tool;
• encoding a first syntax element in the GCI syntax structure for the video data in the bitstream, the first syntax element indicating the total number of the additional constraint syntax elements in the GCI syntax structure;
• and
• transmitting the encoded bitstream, wherein
• the no transform skip residual coding Rice constraint flag in the GCI syntax structure is equal to 1 when the video data is encoded based on a default value of a transform skip residual coding Rice present in slice header flag that is associated with the residual coding tool.