Constraining operational bit depth of adaptive loop filtering for coding of video data at different bit depth

A device for coding video data, the device comprising:

• memory configured to store the video data;
• and
• one or more processors implemented in circuitry and communicatively coupled to the memory, the one or more processors being configured to:
• adjust an input bit depth of reconstructed samples of video data to a fixed bit depth, wherein the fixed bit depth is different than the input bit depth and wherein as part of adjusting the input bit depth the one or more processors are configured to right bit shift a reconstructed sample value by a number of bits to generate a right-bit-shifted reconstructed sample value, wherein the number of bits is based on the input bit depth and an operational bit depth of a classifier;
• classify the reconstructed samples at the fixed bit depth;
• determine a filter based on the classification;
• adaptive loop filter the reconstructed samples at the input bit depth based on the determined filter;
• and
• process the adaptive loop filtered samples.

A non-transitory computer-readable storage medium storing instructions that, when executed, cause one or more processors to:

• adjust an input bit depth of reconstructed samples of video data to a fixed bit depth, wherein the fixed bit depth is different than the input bit depth and wherein as part of adjusting the input bit depth the one or more processors are configured to right bit shift a reconstructed sample value by a number of bits to generate a right-bit-shifted reconstructed sample value, wherein the number of bits is based on the input bit depth and an operational bit depth of a classifier;
• classify the reconstructed samples at the fixed bit depth;
• determine a filter based on the classification;
• adaptive loop filter the reconstructed samples at the input bit depth based on the determined filter;
• and
• process the adaptive loop filtered samples.

A device for coding video data, the device comprising:

• means for adjusting an input bit depth of reconstructed samples of video data to a fixed bit depth, wherein the fixed bit depth is different than the input bit depth and wherein adjusting the input bit depth comprises right bit shifting of a reconstructed sample value by a number of bits to generate a right-bit-shifted reconstructed sample value, wherein the number of bits is based on the input bit depth and an operational bit depth of a classifier;
• means for classifying the reconstructed samples at the fixed bit depth;
• means for determining a filter based on the classification;
• means for adaptive loop filtering the reconstructed samples at the input bit depth based on the determined filter;
• and
• means for processing the adaptive loop filtered samples.