Deep-review round 1 on feature/plex-hdr-hw-tonemap:
- F1 (correctness): _select_encode gated tonemap on bit-depth alone, so a
10-bit *SDR* (bt709) source got the HDR hable tone curve applied, visibly
altering an SDR picture where only a 10->8-bit downconvert was needed. Split
the ffprobe gate into a 3-way classifier (_probe_video_kind: hwsafe / hdr /
sdr10); only true-HDR (PQ/HLG) takes the OpenCL tonemap graph, 10-bit SDR
drops to software libx264 (an exact downconvert). Applies to both auto and on.
- F2 (race): the runtime HW->SW fallback popped+killed _sessions[key] with no
identity check. Because wait_for blocks OUTSIDE _lock, a concurrent same-key
_spawn (rapid seek-restart) or _enforce_cap cull could kill this session; the
fallback then respawned software over the NEWER session and breached the
transcode cap. Guard the respawn: only fall back if _sessions[key] is still
this session, else yield the currently-registered one.
- tests: 3-way classifier (incl. HLG + empty-probe), real _opencl_present glob,
real wait_for proc fast-fail branch, tonemap-variant fallback, the F1
regressions (auto + on), the supersede/no-respawn race, and the on/opencl
matrix cell. Backend gate green (ruff + full pytest).
peter
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