enricobuehler
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Field follow-up to 6dc195f9 (the AMD host whose H265 encode sits at ~5 ms):
the remaining time is the VCN ASIC preset, and we never chose one.
1. Explicit encode quality level. RADV only emits a VCN preset op when the
app issues ENCODE_QUALITY_LEVEL — we never did, so every session ran the
firmware's default preset. Install the resolved level on the first
frame's RESET control (chained ahead of the CBR state, which satisfies
the spec's quality-change-carries-rate-control rule) and bake the same
level into the session-parameters object (the spec requires the match).
Default 0 = the fastest tier the driver exposes (RADV: SPEED, except
H265 on pre-RDNA4 which the driver pins to BALANCE); clamped to the
profile's maxQualityLevels. PUNKTFUNK_VULKAN_QUALITY=0..3 overrides for
quality-biased setups. Logged at open so field logs show the tier.
2. Persistent bitstream mapping. read_slot vkMapMemory/vkUnmapMemory'd the
host-visible bitstream buffer every frame; map each ring slot once at
build instead (coherent memory; vkFreeMemory implicitly unmaps).
3. PUNKTFUNK_PERF CSC split. GPU timestamps bracket the compute batch
(import barriers + cursor prep + CSC dispatch + plane copies) and a
sampled csc_us line logs every ~2 s — separating shader/copy time from
the ASIC encode inside the pump's wait_us, the VAAPI submit-split
analog for this backend. Off (and unrecorded) unless PUNKTFUNK_PERF.
Verified: cargo check + clippy + DPB/RPS unit tests green (Linux box).
The GPU smoke tests still need a RADV host (NVIDIA driver fails session
open on the build box, pre-existing).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>