Video decoding apparatus, computing system including the same, and video decoding method

A video decoding apparatus comprising:

• an entropy decoder configured to,
• obtain encoding information of a bitstream of an encoded video from a header of the bitstream, the encoding information including a bit depth of the bitstream, and
• convert a first quantization parameter of the bitstream into a second quantization parameter when the bit depth of the bitstream is greater than a reference bit depth;
• an adder configured to generate data of a spatial domain based on residue data, the residue data being restored using a quantization step size and data intra-predicted or inter-predicted from the bitstream, the quantization step size corresponding to the second quantization parameter when the bit depth of the bitstream is greater than the reference bit depth;
• and
• a sample adaptive offset (SAO) filter configured to generate a video output by performing SAO filtering on the data of the spatial domain based on the second quantization parameter and a decoding offset.

A video decoding method comprising:

• receiving a bitstream of an encoded video;
• obtaining a bit depth of the bitstream from encoding information included in a header of the bitstream;
• converting a first quantization parameter of the bitstream into a second quantization parameter based on the bit depth of the bitstream of the encoded video and a reference bit depth;
• and
• decoding the bitstream of the encoded video based on the second quantization parameter.