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Draft: waylandsink: Detect output rotation and (optionally) pre-rotate buffers in decoders

Robert Mader requested to merge rmader/gstreamer:waylandsink-detect-output-rotation into main

On some hardware decoders are able to rotate buffers cheaply during e.g. post-processing. Especially on 90/270 degree rotated outputs this can have advantages compared to doing the rotation with display hardware.

Implement display rotation detection for GstWaylandSink and add plumbing to pass that info up to decoders.

TODOs:

  • waylandsink: offload rotate-method to display server (!2543 (merged))
  • waylandsink: offload output and rotate-method orientations to upstream via GstVideoOrientationMeta (or display server if not successful)
  • videoflip: support GstVideoOrientationMeta from downstream
  • videoflip: support GstVideoOrientationMeta from upstream (optional or follow-up)
  • videoflip: offload method and downstream GstVideoOrientationMeta orientations to upstream (optional or follow-up)
  • va: support GstVideoOrientationMeta from downstream (optional or follow-up)
  • Some more cleanups

cc @ndufresne, @ocrete, @gkiagia

Edited by Robert Mader

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