We only support equal MB/CTB per slice (with last slice possibly
smaller) and this is not possible to fully describe with libva slice
structure constraints.
Report that we support arbitrary macroblocks per slice, verify if the
slice structure requested by application can be used, otherwise
divide the slices equally to achieve the requested number of slices.
Also stop reporting power of two structure support, as that implies
different size for each slice which cannot be supported.
This fixes issue where slice encoding is not available at all with some
applications (only supporting arbitrary macroblocks) or the number of slices
being different from the requested number.
Reviewed-by: Ruijing Dong <ruijing.dong@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30363>
David Rosca
eb1f64a01e