ROI (region of interest) feature implementation
in va.
It does not support ROI priority, and supports
qp delta, and the maximum number of supported
region is defined as 32, the region sequence implies
the priority, the lower the sequence number, the higher
the region priority, when region overlapping happened,
the higher priority region overwrites the lower
priority one.
And specifically for AV1, the adjust step will be
rounded by 5 when rate control is used, for example,
if qp_delta (q index) is 6, it will use 5, if
qp_delta is 8, it will use 10.
For AVC/HEVC (RC/CQP) and AV1 CQP mode, the
qp_delta granularity is 1.
Reviewed-by: Boyuan Zhang <boyuan.zhang@amd.com>
Signed-off-by: Ruijing Dong <ruijing.dong@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26659>