Method and apparatus for video coding

An apparatus for video decoding, comprising:

• processing circuitry configured to:
• decode prediction information of a current block in a current coding tree unit (CTU) from a coded video bitstream, the prediction information being indicative of an intra block copy mode, a size of the current CTU being smaller than a maximum size of a reference sample memory for storing reconstructed samples;
• determine a block vector that points to a reference block in a same picture as the current block, the reference block having reconstructed samples buffered in the reference sample memory;
• and
• reconstruct at least a sample of the current block based on the reconstructed samples of the reference block that are retrieved from the reference sample memory.

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

• decoding prediction information of a current block in a current coding tree unit (CTU) from a coded video bitstream, a size of the current CTU being smaller than a maximum size of a reference sample memory for storing reconstructed samples, the prediction information being indicative of an intra block copy mode;
• determining a block vector that points to a reference block in a same picture as the current block, the reference block having reconstructed samples buffered in the reference sample memory;
• and
• reconstructing at least a sample of the current block based on the reconstructed samples of the reference block that are retrieved from the reference sample memory.