Method and apparatus for video coding

An apparatus for video decoding, comprising processing circuitry configured to:

• obtain a gate flag for each of at least one constraint information group in constraint information in a syntax structure signaled in a coded video bitstream, each gate flag indicating whether a constraint information group of the at least one constraint information group corresponding to the respective gate flag is present in the constraint information, the constraint information being for a subset of coding blocks in the coded video bitstream, and the constraint information group of the gate flag including a plurality of constraint flags for the subset of coding blocks, wherein the gate flag for each of the at least one constraint information group is signaled in the constraint information in the syntax structure and each gate flag indicates whether the plurality of constraint flags for the subset of coding blocks corresponding to the respective gate flag is signaled in the constraint information in the same syntax structure;
• determine, based on the gate flag of the constraint information group of the at least one constraint information group, whether the constraint information group of the gate flag is present in the constraint information;
• determine prediction information for the subset of coding blocks based on whether the constraint information group of the gate flag is present in the constraint information;
• and
• reconstruct the subset of coding blocks based on the prediction information.

A non-transitory computer-readable storage medium storing instructions executable by at least one processor to perform:

• obtaining a gate flag for each of at least one constraint information group in constraint information in a syntax structure signaled in a coded video bitstream, each gate flag indicating whether a constraint information group of the at least one constraint information group corresponding to the respective gate flag is present in the constraint information, the constraint information being for a subset of coding blocks in the coded video bitstream, and the constraint information group of the gate flag including a plurality of constraint flags for the subset of coding blocks, wherein the gate flag for each of the at least one constraint information group is signaled in the constraint information in the syntax structure and each gate flag indicates whether the plurality of constraint flags for the subset of coding blocks corresponding to the respective gate flag is signaled in the constraint information in the same syntax structure;
• determining, based on the gate flag of the constraint information group of the at least one constraint information group, whether the constraint information group of the gate flag is present in the constraint information;
• determining prediction information for the subset of coding blocks based on whether the constraint information group of the gate flag is present in the constraint information;
• and
• reconstructing the subset of coding blocks based on the prediction information.