Low complexity history usage for rice parameter derivation for high bit-depth video coding

A method of decoding video data, the method comprising:

• obtaining a transform block;
• determining one or more non-zero decoded transform coefficients at least in part based on an analysis of the transform block;
• determining, based on at least a portion of the one or more non-zero decoded transform coefficients, a history update value for the transform block;
• updating an existing historic parameter value at least in part by combining the history update value for the transform block with the existing historic parameter value, the existing historic parameter value based at least in part on a series of non-zero decoded transform coefficients determined from a series of previously analyzed transform blocks;
• and
• decoding at least one sample of the transform block based on the existing historic parameter value or the updated existing historic parameter value.

An apparatus for decoding video data, comprising:

• at least one memory;
• and
• at least one processor coupled to the at least one memory, the at least one processor configured to:
• obtain a transform block, the transform block including a plurality of samples;
• determine one or more parameters for the plurality of samples at least in part by analyzing a local neighborhood of a current sample of the plurality of samples;
• determine, based at least in part on the analysis of the local neighborhood, that a number of neighboring transform coefficients of the current sample is less than a threshold amount;
• obtain a historic parameter value determined from one or more previously decoded transform blocks;
• based at least in part on the historic parameter value, determine a parameter for the current sample;
• and
• decode the current sample based on the determined parameter for the current sample.

An apparatus for decoding video data, comprising:

• at least one memory;
• and
• at least one processor coupled to the at least one memory, the at least one processor configured to:
• obtain a transform block;
• determine one or more non-zero decoded transform coefficients at least in part based on an analysis of the transform block;
• determine, based on at least a portion of the one or more non-zero decoded transform coefficients, a history update value for the transform block;
• and
• update an existing historic parameter value at least in part by combining the history update value for the transform block with the existing historic parameter value, the existing historic parameter value based at least in part on a series of non-zero decoded transform coefficients determined from a series of previously analyzed transform blocks;
• and
• decode at least one sample of the transform block based on the existing historic parameter value or the updated existing historic parameter value.