Video coding using function-based scan order for transform coefficients

An apparatus for coding video data, the apparatus comprising:

• means for selecting, based at least in part on a predefined function and parameter values for the function, a scan order for transform coefficients associated with a block of residual video data, the parameter values including a size of the block of residual video data, an orientation of the scan order, and an orientation strength of the scan order, wherein the orientation of the scan order designates whether the scan order is mainly oriented horizontally or vertically in terms of scanning across rows or columns of a block of the transform coefficients, and wherein the orientation strength of the scan order indicates a degree to which the scan order is biased toward the orientation of the scan order;
• and
• means for scanning the transform coefficients according to the scan order for use in a video coding process for the video data.

A non-transitory computer-readable medium comprising instructions to cause a video coder to:

• select, based at least in part on a predefined function and parameter values for the function, a scan order for transform coefficients associated with a block of residual video data, the parameter values including a size of the block of residual video data, an orientation of the scan order, and an orientation strength of the scan order, wherein the orientation of the scan order designates whether the scan order is mainly oriented horizontally or vertically in terms of scanning across rows or columns of a block of the transform coefficients, and wherein the orientation strength of the scan order indicates a degree to which the scan order is biased toward the orientation of the scan order;
• and
• scan the transform coefficients according to the scan order for use in a video coding process for video data.