I've taken peeks at threads related to hardware decoding (of H.264 and HEVC, mainly) on Allwinner and Rockchip platforms on and off, sometimes dabbled in trying and failing to implement solutions recommended there. Being a complete amateur, I find the topic very opaque and confusing, with various different components that need to interface with each other, be patched in sync, and sometimes change drastically between kernel versions, etc. Today I sat down and read up on these subjects, scouring w