claude-noether
7cbf4ce15b
All seven questions from the initial design draft decided in the
user's 2026-05-24 review:
1. Intra prediction: GPU wavefront in Phase 1, revisit if bottleneck
2. libavcodec intercept: macroblock-level for Phase 1
3. Shader parameterisation: measure both during Phase 2 MC, pick winner
4. DPB allocation: Vulkan-native VkImage with dma_buf export
5. Daemon integration: library link
6. daedalus-fourier dep: CMake find_package, pinned to tagged release
7. Codec scope: H.264 first; HEVC/10-bit/interlaced/FMO/ASO firmly out;
VP9 + AV1 deferred to Phase 5+ but NOT firmly out (scope expansion
vs the initial draft which had grouped them with HEVC)
Section heading renamed "Open questions" → "Phase 1 decisions" with
explicit user-confirmed annotations. Each item preserves the original
wording for traceability.
§8 Phasing extended with a Phase 5+ paragraph clarifying the VP9/AV1
deferral and reaffirming HEVC's firmly-out status.
No architecture changes; only decisions captured. Phase 1
implementation can now begin against this baseline.
daedalus-decoder
Frame-level GPU H.264 decoder for Raspberry Pi 5 / V3D7. Design phase — not implemented yet.
The objective: build the NVDEC-equivalent shape on Pi 5. One Vulkan submit per frame, one fence wait per frame, encoded H.264 bitstream in, NV12 frame out. Reuses daedalus-fourier's V3D compute primitives at the right granularity — not the per-block-call granularity that the kernel-substitution prototype exposed as architecturally wrong.
Sibling projects:
- daedalus-fourier — V3D + NEON kernel pack (IDCT, MC, deblock primitives). Stays as research/microbench artifact.
- daedalus-v4l2 — V4L2 stateless decoder shim + userspace daemon for Pi 5. The eventual consumer of this decoder.
- libva-v4l2-request-fourier — VAAPI ↔ V4L2 stateless bridge. End consumer.
See DESIGN.md for the architecture sketch.