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Phase 8 skeleton: public C API + first end-to-end smoke test

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include/daedalus.h: stable C API surface exposing the 5 cycles
(VP9 IDCT 8x8, LPF wd=4, MC 8h, LPF wd=8; AV1 CDEF). Per-kernel
recipe-dispatch helpers default to the cycle 1-5 verdict
substrate (QPU for cycles 1+2+4, CPU for cycles 3+5); explicit
override available for benchmarking and runtime-aware scheduling.

src/daedalus_core.c: NEON-path implementation of all 5 kernels
wrapped behind the public API. QPU path stubbed out (returns -1)
since wiring v3d_runner into daedalus_ctx is the next Phase 8
sub-step; with has_qpu=0 the recipe falls back to CPU cleanly.

tests/test_api_idct.c: 64-block IDCT through the public recipe
dispatch, bit-exact vs C ref. PASS 4096/4096 bytes — proves the
API surface compiles, library links, dispatch routing works, and
NEON fallback delivers correct results.

docs/phase8_scoping.md: architecture options (A=userspace V4L2,
B=kernel V4L2 shim, C=direct libva); pick A for v1; explicitly
out-of-scope work tracked.

Next Phase 8 sub-step: wire v3d_runner into daedalus_ctx so
has_qpu=1 and QPU dispatch goes through the API too. After that:
V4L2 ioctl glue, bitstream parser, superblock loop.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Markus Fritsche
2026-05-18 13:54:43 +00:00
parent 5223d3cb3f
commit 760f6a4060
5 changed files with 733 additions and 0 deletions
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CMakeLists.txt
+26
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@@ -276,6 +276,32 @@ if (DAEDALUS_BUILD_VULKAN)
add_dependencies(bench_v3d_cdef daedalus_shaders)
target_link_libraries(bench_v3d_cdef PRIVATE v3d_runner Vulkan::Vulkan)
target_compile_options(bench_v3d_cdef PRIVATE -O2)
endif()
# ---- Phase 8 — public C API library + smoke test ---------------------------
add_library(daedalus_core STATIC
src/daedalus_core.c
${FFASM_SOURCES}
${FFASM_LPF_SOURCES}
${FFASM_MC_SOURCES}
${FFC_MC_SOURCES}
${DAV1D_CDEF_ASM_SOURCES}
${DAV1D_CDEF_C_SOURCES}
)
target_include_directories(daedalus_core PUBLIC include)
target_compile_options(daedalus_core PRIVATE -O2)
add_executable(test_api_idct
tests/test_api_idct.c
tests/vp9_idct8_ref.c
)
target_link_libraries(test_api_idct PRIVATE daedalus_core)
target_compile_options(test_api_idct PRIVATE -O2)
if (DAEDALUS_BUILD_VULKAN)
# (re-open the conditional so the closing endif() below balances)
# M4 — concurrent CPU(NEON) + QPU bench. Links the FFmpeg NEON
# snapshot so we can run real NEON kernels on pinned CPU cores