 marfrit
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4b36077b17
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iter4 Phase 4: plan locks 12 contract clauses + Mitigation B
5-commit plan (Z, A, B, C, optional D):
- Commit Z: src/request.c — walk /dev/video* + /dev/media*, match by
driver name in {rkvdec, hantro-vpu, cedrus, sun4i_csi}; restores
baseline functionality on 7.0 (where /dev/video0 is rockchip-rga).
- Commit A: src/config.c — VAProfileVP9Profile0 enumeration + dispatch
+ entrypoints (~16 LOC, 1 file).
- Commit B: NEW src/vp9.c + .h + meson — 12 contract clauses; ~580 LOC
vp9.c (50 infra + 80 VPX rac + 50 uncompressed-header partial parse +
180 compressed-header parser + ~200 frame-fill).
- Commit C: src/picture.c + surface.h — VP9 dispatch + 2 buffer-type
cases + union extension; NO BeginPicture reset (VP9 has no
iqmatrix_set-style flags).
- Commit D: optional fix-forward placeholder (predicted no-op per
feedback_runtime_enumerates_allowlists.md).
Total ~699 LOC, 7 files.
12 contract clauses include 2 NEW vs iter3:
- Clause 3: compile-time _Static_assert sizeof v4l2_ctrl_vp9_frame ==
168 && ..._compressed_hdr == 2040 (any UAPI shift fails loudly).
- Clause 6: uncompressed-header partial parse for lf_delta_* +
base_q_idx (VAAPI doesn't expose; BBB keyframe needs non-zero
ref_deltas={1,0,-1,-1} per Phase 3 anchor).
7 Phase 5 review questions queued, all empirical-leaning per
feedback_review_empirical_over_theoretical.md Direction 2:
parser-vs-bitstream cross-check, FFmpeg-XOR-remap validation,
struct-size stability, mitigation B regression risk.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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2026-05-09 23:10:47 +00:00 |
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