Encoding Method and Apparatus

A video data decoding device, comprising:

• a non-transitory memory storage configured to store video data in a form of a bitstream;
• and
• one or more processor coupled to the non-transitory memory storage and configured to:
• obtain prediction information of a coding unit (CU);
• obtain, when the CU comprises only one residual transform unit (TU) and a size of the residual TU is less than a size of the CU, a TU partitioning mode of the CU and a residual position of the residual TU;
• select, based on the TU partitioning mode and the residual position, a transform type of the residual TU from a transform type set;
• apply, based on the transform type of the residual TU, an inverse transform to dequantized coefficients of the residual TU to obtain a residual block of the residual TU;
• obtain a prediction block of the CU based on the prediction information;
• and
• obtain a video block based on the residual block and the prediction block.

A non-transitory computer readable storage medium storing computer program code, which when executed by a processor of a video data decoding device, causes the video data decoding device to:

• obtain prediction information of a coding unit (CU);
• obtain, when the CU comprises only one residual transform unit (TU) and a size of the residual TU is less than a size of the CU, a TU partitioning mode of the CU and a residual position of the residual TU;
• select, based on the TU partitioning mode and the residual position, a transform type of the residual TU from a transform type set;
• apply, based on the transform type of the residual TU, an inverse transform to dequantized coefficients of the residual TU to obtain a residual block of the residual TU;
• obtain a prediction block of the CU based on the prediction information;
• and
• obtain a video block based on the residual block and the prediction block.