Chroma slice-level qp offset and deblocking

An apparatus for processing video data, the apparatus comprising a video coder configured to:

• decode a first block of video data and a second block of video data, wherein the first block of video data and the second block of video data share a common edge;
• determine a first luminance quantization parameter for the first block of video data and a second luminance quantization parameter for the second block of video data;
• for each of one or more chrominance components, determine a chrominance quantization parameter offset value;
• for each of the one or more chrominance components, calculate a chrominance quantization parameter for the edge based on the first luminance quantization parameter for the first block of video data, the second luminance quantization parameter for the second block of video data, and the chrominance quantization parameter offset value for the chrominance component;
• for each of the one or more chrominance components, determine a strength for a deblocking filter for the common edge based on the chrominance quantization parameter for the chrominance component;
• and
• for each of the one or more chrominance components, apply the deblocking filter according to the determined strength to deblock the common edge.

An apparatus for processing video data, the apparatus comprising:

• means for decoding a first block of video data and a second block of video data, wherein the first block of video data and the second block of video data share a common edge;
• means for determining a first luminance quantization parameter for the first block of video data and a second luminance quantization parameter for the second block of video data;
• means for, for each of one or more chrominance components, determining a chrominance quantization parameter offset value;
• means for, for each of the one or more chrominance components, calculating a chrominance quantization parameter for the edge based on the first luminance quantization parameter for the first block of video data, the second luminance quantization parameter for the second block of video data, and the chrominance quantization parameter offset value for the chrominance component;
• means for, for each of the one or more chrominance components, determining a strength for a deblocking filter for the common edge based on the chrominance quantization parameter for the chrominance component;
• and
• means for, for each of the one or more chrominance components, applying the deblocking filter according to the determined strength to deblock the common edge.

A computer-readable storage medium comprising instructions stored thereon that, when executed, cause a processor of a video coder to:

• decode a first block of video data and a second block of video data, wherein the first block of video data and the second block of video data share a common edge;
• determine a first luminance quantization parameter for the first block of video data and a second luminance quantization parameter for the second block of video data;
• for each of one or more chrominance components, determine a chrominance quantization parameter offset value;
• for each of the one or more chrominance components, calculate a chrominance quantization parameter for the edge based on the first luminance quantization parameter for the first block of video data, the second luminance quantization parameter for the second block of video data, and the chrominance quantization parameter offset value for the chrominance component;
• for each of the one or more chrominance components, determine a strength for a deblocking filter for the common edge based on the chrominance quantization parameter for the chrominance component;
• and
• for each of the one or more chrominance components, apply the deblocking filter according to the determined strength to deblock the common edge.