Block sized based transform restrictions

An apparatus for decoding a block of video data, comprising:

• a memory, and
• a processor, configured to:
• decode a block comprising at least two rectangular sub-blocks;
• apply an inverse transform on coefficients of a first sub-block by applying a power-of-two sized inverse transform to generate residuals for the first sub-block;
• insert zeros for residuals in a second sub-block having a dimension that is not a power-of-two;
• reconstruct residuals of the first sub-block and second sub-block that comprise the block.

A method for coding a block of video data, comprising:

• encoding a block comprising at least two rectangular sub-blocks, wherein, said processing comprises:
• obtaining residuals for the block using interprediction;
• dividing said residuals for the block into at least two sub-blocks comprising at least one sub-block having a dimension that is not a power-of-two;
• replacing residuals for the at least one sub-block having a dimension that is not a power-of-two by zeros;
• transforming each remaining sub-block using power-of-two sized transforms to generate transform coefficients.

An apparatus for coding a block of video data, comprising:

• a memory, and
• a processor, configured to:
• encode a block comprising at least two rectangular sub-blocks, wherein, said processing comprises:
• obtaining residuals for the block using interprediction;
• dividing said residuals for the block into at least two sub-blocks comprising at least one sub-block having a dimension that is not a power-of-two;
• replacing residuals for the at least one sub-block having a dimension that is not a power-of-two by zeros;
• transforming each remaining sub-block using power-of-two sized transforms to generate transform coefficients.