There is no update for sdk, but since you indicate interest I will prepare something.
Right now the best I can offer is rgb_levels source code, as it implements RGB64 mode
https://sourceforge.net/projects/vdf...s/version%202/
Quick summary
Unfortunately there was no chance to modify VDXPixmap without breaking compatibility (or I was not smart enough) so I had to do some workarounds to access new fields.
Basically yes, for RGB64
format = 57
pitch is doubled
data points to uint16 elements
The rules for memory layout (top or bottom) are valid only for input/output, not for filters.
In a filter you always use data+pitch*y (pitch may be positive or negative)
Also there are some metadata:
alpha_type: alpha may be flagged as present or absent per picture.
value range (ref_r etc): may be 0xFFFF for normalized 16-bit data, or something else.
For example it is 0xFF00 for P210,P216,Y416 sources and 0x03FF for Y3[10][10] sources.
These values are also variable per frame.
A filter may request normalized input for simplicity, to always deal with 0xFFFF.