Method and apparatus for video coding

An apparatus for video encoding, comprising:

• processing circuitry configured to:
• generate a picture level initial quantization parameter (QP) value, an initial QP value for a slice in a picture being a sum of the picture level initial QP value and 32;
• generate an adjustment QP value for the slice in the picture;
• wherein
• an adjusted initial value for the slice being a sum of the initial QP value for the slice in the picture and the adjustment QP value,
• the initial QP value for the slice is in a range of [0, +63],
• the adjusted initial value for the slice is in a range of [−QpBdOffset, +63], and
• QpBdOffset represents a value of a luma quantization parameter range offset;
• perform a quantization on data of a block in the slice according to a QP value for the block, the QP value for the block being based on the adjusted initial value for the slice;
• and
• indicating the picture level initial QP value and the adjustment QP value for the slice in a coded video bitstream.

A non-transitory computer-readable medium storing instructions which when executed by a computer for video decoding cause the computer to perform:

• generating a picture level initial quantization parameter (QP) value, an initial QP value for a slice in a picture being a sum of the picture level initial QP value and 32;
• generating an adjustment QP value for the slice in the picture;
• wherein
• an adjusted initial value for the slice being a sum of the initial QP value for the slice in the picture and the adjustment QP value,
• the initial QP value for the slice is in a range of [0, +63],
• the adjusted initial value for the slice is in a range of [−QpBdOffset, +63], and
• QpBdOffset represents a value of a luma quantization parameter range offset;
• performing a quantization on data of a block in the slice according to a QP value for the block, the QP value for the block being based on the adjusted initial value for the slice;
• and
• indicating the picture level initial QP value and the adjustment QP value for the slice in a coded video bitstream.