Pure-C unit test for nv15_unpack_plane_to_p010, independent of any V4L2
hardware. Verifies bit layout against the spec at
Documentation/userspace-api/media/v4l/pixfmt-nv15.rst by packing known
10-bit pixel values, running the unpack, and asserting P010 output
matches pixel<<6.
Coverage:
- zero, all-max
- 8 known position/spread vectors
- widths {1, 2, 3, 7, 8} including remainder paths
- multi-row with stride padding
- chroma-shape (half-height)
Build + run:
cc -Wall -Werror -O2 -o test_nv15_unpack \
tests/test_nv15_unpack.c src/nv15.c
./test_nv15_unpack
Confirmed PASS on noether (x86_64 native). Catches the highest-risk
class of regression in iter39 — silent bit-shift errors in the unpack —
without requiring fresnel hardware.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
