Pivoted from ampere-vp9-enablement (closed at structural impossibility
on rkvdec/vdpu381). Janet PIVOT verdict pointed at AV1 — verification
shows it works out-of-the-box on mainline 7.0.0-rc3:
- Kernel driver: drivers/media/platform/verisilicon/
rockchip_vpu981_hw_av1_dec.c (in-tree, loaded as hantro-vpu)
- Hardware: vpu981 dedicated AV1 IP at fdc70000 (separate from rkvdec)
- V4L2 node: /dev/video4 enumerates AV1F format
- Userspace: ffmpeg -hwaccel v4l2request kdirect path works
Verification: byte-compare HW (hantro-vpu) vs SW (libdav1d) on two
AOM test vectors:
- av1-1-b8-01-size-208x208.ivf (2 frames): 100.0000% exact match
- av1-1-b8-23-film_grain-50.ivf (10 frames): 100.0000% exact match
per frame, including AV1 film_grain post-processing
Pivot outcome:
- VP9 campaign: 10 iterations + 2 architect reviews → structural
impossibility (kernel-side gap that needs upstream/Collabora coord)
- AV1 verification: 0 iterations → bit-perfect first try
The "enablement campaign" framing is mostly inappropriate for AV1 —
this is a verification campaign. Real upstream work was done by
Verisilicon + Collabora; we just confirm it works on ampere.
Optional follow-ups (out of Phase 0 scope):
A. libva backend AV1 dispatch (enables VAAPI consumers)
B. Fluster AV1-TEST-VECTORS comprehensive validation
C. 1080p/4K real-world AV1 stress test
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
