| CPC H04N 19/126 (2014.11) [H04N 19/119 (2014.11); H04N 19/12 (2014.11); H04N 19/176 (2014.11); H04N 19/42 (2014.11); H04N 19/463 (2014.11); H04N 19/60 (2014.11)] | 18 Claims |
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1. An apparatus for decoding a current block of video, comprising:
a memory; and
a processor, the processor configured to execute instructions stored in the memory to:
decode, from a compressed bitstream, a flag indicating whether a residual block for the current block is encoded using vector quantization (VQ);
in response to the flag indicating that the residual block is encoded using VQ, execute instructions to:
decode a parameter indicating an entry in a codebook wherein to decode the parameter indicating the entry in the codebook comprises to:
decode a gain index identifying a gain scalar from a gain codebook, wherein the gain scalar represents a magnitude of the residual block;
decode a shape index identifying a unit-norm vector from a shape codebook, wherein the unit-norm vector represents a directional pattern of the residual block; and
decode a sign bit value; and
decode the residual block using the entry, wherein to decode the residual block comprises to: decode the residual block by multiplying the sign bit value, the gain scalar, and the unit-norm vector;
in response to the flag indicating that the residual block is not encoded using VQ, execute instructions to:
decode the residual block based on a skip flag indicating whether the current block is encoded using transform skip; and
reconstruct the current block using the residual block.
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