First incremental step toward H.264 daemon-rewrite (daedalus-v4l2#11):
make the daedalus-fourier kernel library available to the daemon
process so subsequent patches can substitute its primitives
(IDCT 4×4, IDCT 8×8, luma vertical deblock, etc.) for libavcodec's
per-MB pixel math.
This patch does NOT yet dispatch any kernels. It only:
- Adds `pkg_check_modules(DAEDALUS_FOURIER REQUIRED daedalus-fourier)`
to the daemon's CMakeLists, with explicit link ordering
(libdaedalus_core.a must precede -lvulkan because the static
archive references vulkan symbols and the linker resolves
left-to-right). We bypass IMPORTED_TARGET because pkg-config's
Requires.private chain leaves CMake's dependency graph reordering
the archive after -lvulkan, breaking the static link.
- Calls daedalus_ctx_create_no_qpu() at daemon startup, logs the
substrate-availability line, destroys the context at exit.
no_qpu mode skips V3D Vulkan probe — proves linkage works
without depending on shader-path resolution (which is a
separate piece of work, since v3d_runner currently loads
.spv files from cwd-relative paths and consumer would need
a search path override).
Sample journal line:
[2026-05-21 17:59:35.271 INFO] daedalus-fourier: linked, ctx alive
(no_qpu mode; has_qpu=0)
Build-test verified on hertz (Pi 5 dev host) against an installed
copy of daedalus-fourier r35+gd87239d (from marfrit/daedalus-fourier
PR #1). Binary links cleanly, --help prints, daemon mode opens
chardev (fails predictably on hertz which has no daedalus_v4l2
kmod; on higgs this is the existing working path).
Follow-up patches per daedalus-v4l2#11:
1. Instrument the existing libavcodec decode path to count
per-frame IDCT blocks / deblock edges / MC tiles so we have
a baseline of what work the daemon dispatches for a typical
YouTube H.264 stream.
2. Substitute daedalus-fourier kernels one at a time, measuring
CPU saved per substitution.
3. Wire shader path resolution into daedalus_ctx_create() for
the QPU substrate (V3D opportunistic helper paths).
Wire protocol unchanged. DAEDALUS_PROTO_VERSION stays at 0.
claude-noether