Intra coded video using quantized residual differential pulse code modulation coding

An apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:

• determine, for a conversion between a current video block of a video and a bitstream of the video, a spatial neighboring block of the current video block, wherein the current video block is an intra block, and wherein a differential coding mode is applied to the spatial neighboring block, and in the differential coding mode, a residual of a sample of the spatial neighboring block is represented in the bitstream using a difference between a quantized residual of intra prediction of the spatial neighboring block and a predictor of the quantized residual;
• construct, based on a first intra prediction mode of the spatial neighboring block, a mode candidate list for the current video block;
• determine, based on the mode candidate list, a second intra prediction mode for the current video block;
• and
• perform the conversion based on the second intra prediction mode,
• wherein the first intra prediction mode for samples of the spatial neighboring block applied with the differential coding mode is aligned with a prediction direction used in the differential coding mode for the spatial neighboring block.

A non-transitory computer-readable storage medium storing instructions that cause a processor to:

• determine, for a conversion between a current video block of a video and a bitstream of the video, a spatial neighboring block of the current video block, wherein the current video block is an intra block, and wherein a differential coding mode is applied to the spatial neighboring block, and in the differential coding mode, a residual of a sample of the spatial neighboring block is represented in the bitstream using a difference between a quantized residual of intra prediction of the spatial neighboring block and a predictor of the quantized residual;
• construct, based on a first intra prediction mode of the spatial neighboring block, a mode candidate list for the current video block;
• determine, based on the mode candidate list, a second intra prediction mode for the current video block;
• and
• perform the conversion based on the second intra prediction mode,
• wherein the first intra prediction mode for samples of the spatial neighboring block applied with the differential coding mode is aligned with a prediction direction used in the differential coding mode for the spatial neighboring block.

A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises:

• determining a spatial neighboring block of a current video block, wherein the current video block is an intra block, and wherein a differential coding mode is applied to the spatial neighboring block, and in the differential coding mode, a residual of a sample of the spatial neighboring block is represented in the bitstream using a difference between a quantized residual of intra prediction of the spatial neighboring block and a predictor of the quantized residual;
• constructing, based on a first intra prediction mode of the spatial neighboring block, a mode candidate list for the current video block;
• determining, based on the mode candidate list, a second intra prediction mode for the current video block;
• and
• generating the bitstream based on the second intra prediction mode,
• wherein the first intra prediction mode for samples of the spatial neighboring block applied with the differential coding mode is aligned with a prediction direction used in the differential coding mode for the spatial neighboring block.