Intra block copy scratch frame buffer

A method, the method comprising:

• reconstructing samples of a first block of a current picture of video data;
• storing both a compressed version of the reconstructed samples of the first block in a first frame buffer and an uncompressed version of the reconstructed samples of the first block in a second frame buffer such that, at a particular time, the first frame buffer stores the compressed version of the reconstructed samples and the second frame buffer stores the uncompressed version of the reconstructed samples;
• and
• responsive to determining to reconstruct a second block of the current picture using intra block copy:
• obtaining, from the second frame buffer, samples of a predictor block located in the current picture, the predictor block at least partially overlapping the first block;
• and
• predicting, based on the obtained samples of the predictor block, samples of the second block.

A computer readable storage medium storing instruction that, when executed, cause one or more processors to:

• reconstruct samples of a first block of a current picture of video data;
• store both a compressed version of the reconstructed samples of the first block in a first frame buffer and an uncompressed version of the reconstructed samples of the first block in a second frame buffer such that, at a particular time, the first frame buffer stores the compressed version of the reconstructed samples and the second frame buffer stores the uncompressed version of the reconstructed samples;
• and
• responsive to a determination to reconstruct a second block of the current picture using intra block copy:
• obtain, from the second frame buffer, samples of a predictor block located in the current picture, the predictor block at least partially overlapping the first block;
• and
• predict, based on the obtained samples of the predictor block, samples of the second block.