Backport of "d3d11h264dec: Reconfigure decoder object on DPB size change" and "d3d11h264dec: Keep track of actually configured DPB size" into 1.18
Backport of !1839 (merged) "d3d11h264dec: Reconfigure decoder object on DPB size change" and !2056 (merged) "d3d11h264dec: Keep track of actually configured DPB size"
Edited by Seungha Yang