 claude-noether
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bf52725ab3
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phase1_pi5_hevc: lock goal + situation + N=3 baseline + plan (iter40)
Phase 1 measurable goal: HEVC Main 8-bit bit-exact libva-vs-kdirect
on higgs for 640x360 / 1280x720 / 1920x1080 fixtures with HW path
engagement verified via lsof + ffmpeg-vaapi log signal.
Phase 2 surface-area audit: ~250 LoC backend + 100 LoC standalone
detile primitive. Reuses iter38 multi-device-probe pattern (now
3 slots: rkvdec + hantro + rpi-hevc-dec) + iter2 per-driver
gating shape. h265_set_controls + iter31 a-29 plumbing transfers
unchanged. iter25 SPS pre-seed gated off for rpi-hevc-dec.
Phase 3 baseline locked: N=3 bit-exact SW==kdirect for all three
fixtures on higgs. kdirect engagement signal:
Hwaccel V4L2 HEVC stateless V4; devices: /dev/media1,/dev/video19;
buffers: src DMABuf, dst DMABuf; swfmt=rpi4_8
Phase 4 plan: 7 sequenced steps (request.h -> request.c -> video.c
-> nv12_col128.c new -> image.c branch -> meson/Makefile -> build
on higgs). NC12 tile geometry locked from kernel hevc_d_video.c
math + ffmpeg/Kynesim av_rpi_sand_to_planar_y8 byte-offset formula.
Risks + mitigations enumerated.
Phase 5 sonnet review explicitly requested per CLAUDE.md
no-skip-reviews rule.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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2026-05-17 19:00:35 +00:00 |
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