Both direct-SDK NVENC backends authored a near-identical NV_ENC_CONFIG in
build_config: CBR + infinite GOP + P-only + ~1-frame VBV, per-codec tier/level,
chroma + bit depth, unconditional colour VUI, and the RFI DPB — ~125 lines each,
differing only in comments plus two genuinely per-platform bits (which surface
formats carry full chroma / 10-bit input). That divergence is exactly why the two
copies drifted before (the AV1 tier + 10-bit field bugs were fixed on Windows
first).
Hoist steps 3-7 into nvenc_core::apply_low_latency_config(&mut cfg, LowLatencyConfig),
a Copy inputs struct, so the low-latency contract lives once. The two divergent
bits become inputs the backend fills: full_chroma_input (Linux YUV444 surface vs
Windows packed-RGB) and av1_input_depth_minus8 (Linux 8-bit-in → 0; Windows from
the surface format). Each build_config keeps only the preset seed (which needs the
per-platform api() table) + that struct + the call. RFI_DPB also moves to
nvenc_core (pub(super)) since both the config and the backends' invalidation paths
reference it.
Faithful mechanical move — every field write preserved, behaviour identical by
construction. Verified on BOTH platforms: Linux clippy 0/0 (nvenc,vulkan-encode,
pyrowave, RTX 5070 Ti) and Windows clippy 0/0 (nvenc,amf-qsv, RTX 4090 / .173).
Net -83 lines.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehler
2ae5cf98ee