Signaling general constraints information for video coding

A non-transitory computer-readable medium having program code that is stored thereon, the program code executable by one or more processing devices for performing operations comprising:

• extracting a general constraints information (GCI) flag from a bitstream of a video;
• determining that one or more general constraints are imposed for the video based on a value of the GCI flag;
• in response to determining that one or more general constraints are imposed for the video, extracting, from the bitstream of the video, a value indicating a quantity of additional bits included in the bitstream of the video, the additional bits comprising flag bits indicating respective additional coding tools to be constrained for the video;
• determining whether the value is greater than five;
• in response to determining that the value is greater than five:
• setting a value numAdditionalBitsUsed indicating extracted additional bits to be 6;
• extracting a set of bits from the bitstream, wherein a number of bits in the set of bits equals to gci_num_additional_bits-numAdditionalBitsUsed, gci_num_additional_bits representing the value, and the set of bits comprises six flag bits representing six respective flags indicating respective constraints for six additional coding tools;
• and
• independent of the set of bits, decoding a remaining portion of the bitstream of the video into images based, at least in part, upon the constraints for the six additional coding tools indicated by the six flags;
• in response to determining that the value is not greater than five:
• setting a value numAdditionalBitsUsed indicating extracted additional bits to be 0;
• extracting a set of bits from the bitstream, wherein a number of bits in the set of bits equals to gci_num_additional_bits-numAdditionalBitsUsed, gci_num_additional_bits representing the value;
• and
• decoding the remaining portion of the bitstream of the video into images independent of the extracted set of bits.

A system comprising:

• a processing device;
• and
• a non-transitory computer-readable medium communicatively coupled to the processing device, wherein the processing device is configured to execute program code stored in the non-transitory computer-readable medium and thereby perform operations comprising:
• extracting a general constraints information (GCI) flag from a bitstream of a video;
• determining that one or more general constraints are imposed for the video based on a value of the GCI flag;
• in response to determining that one or more general constraints are imposed for the video, extracting, from the bitstream of the video, a value indicating a quantity of additional bits included in the bitstream of the video, the additional bits comprising flag bits indicating respective additional coding tools to be constrained for the video;
• determining whether the value is greater than five;
• in response to determining that the value is greater than five,
• setting a value numAdditionalBitsUsed indicating extracted additional bits to be 6;
• extracting a set of bits from the bitstream, wherein a number of bits in the set of bits equals to gci_num_additional_bits-numAdditionalBitsUsed, gci_num_additional_bits representing the value, and the set of bits comprises six flag bits representing six respective flags indicating respective constraints for six additional coding tools;
• and
• independent of the set of bits, decoding a remaining portion of the bitstream of the video into images based, at least in part, upon the constraints for the six additional coding tools indicated by the six flags;
• in response to determining that the value is not greater than five:
• setting a value numAdditionalBitsUsed indicating extracted additional bits to be 0;
• extracting a set of bits from the bitstream, wherein a number of bits in the set of bits equals to gci_num_additional_bits-numAdditionalBitsUsed, gci_num_additional_bits representing the value;
• and
• decoding the remaining portion of the bitstream of the video into images independent of the extracted set of bits.