Network abstraction layer unit header

A device for reconstructing a Network Abstraction Layer (NAL) unit for video decoding, the device comprising:

• at least one memory configured to store program code;
• and
• at least one processor configured to read the program code and operate as instructed by the program code, the program code including:
• first decoding code configured to cause the at least one processor to decode a first syntax element comprising a first fixed length, binary-coded NAL unit syntax element included in a NAL unit header;
• first determining code configured to cause the at least one processor to, based on the first syntax element, determine a NAL unit class comprising a plurality of NAL unit types;
• second decoding code configured to cause the at least one processor to decode a second syntax element comprising a second fixed length, binary-coded NAL unit syntax element included in the NAL unit header, the second syntax element being different from the first syntax element. second determining code configured to cause the at least one processor to, based on the NAL unit class being a first NAL unit class, determine a NAL unit type from among the NAL unit types using a combination of the NAL unit class and the second syntax element, and reconstruct the NAL unit based on the determined NAL unit type;
• and
• third determining code configured to cause the at least one processor to, based on the NAL unit class being a second NAL unit class, determine a temporal identifier (TID) based on the second syntax element, and reconstruct the NAL unit based on the determined TID.

A non-transitory computer-readable medium storing instructions, the instructions comprising:

• one or more instructions that, when executed by one or more processors of a device for reconstructing a Network Abstraction Layer (NAL) unit for video decoding, cause the one or more processors to:
• decode a first syntax element included in a NAL unit header;
• determine, based on the first syntax element, a NAL unit class comprising a plurality of NAL unit types;
• decode a second syntax element included in the NAL unit header, the second syntax element being different from the first syntax element;
• based on the NAL unit class being a first NAL unit class, determine a NAL unit type from among the NAL unit types using a combination of the NAL unit class and the second syntax element, and reconstruct the NAL unit based on the determined NAL unit type;
• and
• wherein based on the NAL unit class being a second NAL unit class, determine a temporal identifier (TID) based on the second syntax element and reconstruct the NAL unit based on the determined TID.