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HW5: Linux VA-API H.264 hardware decoding (#30)

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Stateless VA-API decoding with FilmCraft's own H.264 host side: the
software decoder's SPS/PPS/slice-header parsers and its DPB (now generic
over the picture type in filmcraft-h264) drive the GPU, so reference
marking, reference lists and output order are shared and the pictures are
bit-exact with the software decoder. libva is loaded at run time; no libva
or driver means software decoding as before. frame_num gaps (open-GOP
seeks) get the software decoder's stand-in frames. HybridDecoder keeps the
transparent software fallback.

Tests: hardware parity on 7 H.264 streams incl. 1080p/2160p, seeks,
flushes, forced failures, fuzzing, concurrency; front end against a
recording stand-in on every OS; ABI checks against va.h. Docs: platform
README, ADR 0001 addendum, architecture, performance (H.264 2160p CPU per
frame 417 -> 11 ms on Iris Xe), roadmap.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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JordyUSA
2026-10-09 08:35:57 +07:00
parent 5231852443
commit 3496e553e7
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docs/architecture.md
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@@ -72,7 +72,7 @@ and `filmcraft-cli`.
| `engine` | L4 | `Session`, command registry, undo history, media pool, jobs, interchange glue |
| `ui-egui` | L5 | the egui frontend: docking, panels, timeline, monitors, playback, control-channel handlers |
| `automation` | L5 | MCP server (`rmcp`, stdio), headless or bridged to the running app |
| `platform` | L5 | OS media FFI only: hardware video decoding (VideoToolbox H.264 / HEVC on macOS; Media Foundation / Direct3D 11 H.264 / HEVC on Windows; a no-op elsewhere) behind `codecs::VideoDecoder`, with transparent fallback to our decoders, and hardware H.264 encoding (VideoToolbox, opt-in) and H.265 encoding (VideoToolbox, the only H.265 encoder; the format exists only where a hardware encoder does) and NVIDIA NVENC H.264 encoding (Windows, opt-in) behind `export::VideoEncoder`; H.264 declines to the built-in encoder for what the hardware does not take. The one crate allowed `unsafe` ([ADR 0001](adr/0001-platform-ffi.md), [README](../crates/platform/README.md)) |
| `platform` | L5 | OS media FFI only: hardware video decoding (VideoToolbox H.264 / HEVC on macOS; Media Foundation / Direct3D 11 H.264 / HEVC / VP9 / AV1 on Windows; VA-API H.264 on Linux, with our own H.264 parsers and DPB driving the stateless hardware; a no-op elsewhere) behind `codecs::VideoDecoder`, with transparent fallback to our decoders, and hardware H.264 encoding (VideoToolbox, opt-in) and H.265 encoding (VideoToolbox, the only H.265 encoder; the format exists only where a hardware encoder does) and NVIDIA NVENC H.264 encoding (Windows, opt-in) behind `export::VideoEncoder`; H.264 declines to the built-in encoder for what the hardware does not take. The one crate allowed `unsafe` ([ADR 0001](adr/0001-platform-ffi.md), [README](../crates/platform/README.md)) |
| `filmcraft` | L6 | desktop binary: eframe/wgpu window, cpal audio output, file dialogs, native macOS menu, TCP control server |
| `filmcraft-cli` | L6 | headless CLI: `exec`, `run`, `inspect`, `describe`, `commands`, `import`, `export`, `render`, `probe`, `mcp`; `--bridge` targets the running app |
| `filmcraft-web` | L6 | the browser app (wasm32): eframe web runner on WebGPU/WebGL2, Blob-backed services, OPFS recovery, WebAudio, WebCodecs, `window.filmcraft` API ([web.md](web.md)) |