vaapioverlay: inline sinkpad scaling support
Often, users will need to scale inputs (e.g. with vaapipostproc) before they are submitted to the vaapioverlay. However, this results in multiple VPP passes/operations in the pipeline which creates unnecessary process overhead. This change allows for inputs to be submitted at original scale to vaapioverlay with per-sinkpad scale dimensions specified so they can be scaled and blended/composited in a single VPP pass/operation to avoid the unnecessary process overhead.
!1380 with vaapioverlay-optimize in 51 seconds (queued for 2 seconds)18 jobs for