Audit-driven follow-up after the SAFETY-debt commit (Oracle steps 6-7).
End state: cargo clippy --release --all-targets still 0 errors; private_interfaces
and type_complexity warnings cleared.
Design cleanups (Oracle step 6):
- cap_portal.rs: introduce PortalFormatInfo struct to replace the
Rc<Cell<Option<(u32,u32,u32,u64)>>> cross-callback hand-off. Self-
documenting struct fields replace positional tuple access at the
format-change and process callbacks.
- avhw.rs: import_dma_buf_to_vaapi signature collapses from 8 args
(fd/width/height/drm_format/modifier/stride/offset) to
(*mut AVBufferRef, &PwDmaBufFrame). Callers in avhw.rs,
state_portal.rs, and vaapi_import_bench.rs now pass the frame by
reference instead of unpacking 7 fields just to repack them. Drops
the unused width parameter and the too_many_arguments(8/7) warning.
- state.rs: visibility hygiene. EncConstructionStage and WlrHeadInfo
downgrade pub -> pub(crate); State.stage field downgrades to
pub(crate). These are internal state-machine types not exposed
across the crate boundary; making them pub(crate) clears all
private_interfaces warnings without leaking more types.
Dead-code purge (Oracle step 7):
- transform.rs: remove unused Rect struct, transform_basis,
screen_to_frame, fit_inside_bounds helpers and their 18 dedicated
tests. Transform enum and transpose_if_transform_transposed remain
(both are actively used by state.rs and avhw.rs). File shrinks
from 409 -> 109 lines.
Repository housekeeping (Oracle step 7):
- .gitignore: add review.json (stray review-tool output that
regenerates per run).
- README.md: refresh CLI table to match src/args.rs (now lists
--backend, --no-persist, --port-as-WebRTC-signaling, --max-bitrate,
--stats). Add capture-backend explainer + 4 new usage examples.
Note in README points readers at src/args.rs as the authoritative
source. Remove stale 'WebTransport, unused in MVP' description.
avhw.rs: AsRawFd import annotated with a rustc-quirk explanation — the
import triggers a false 'unused_imports' warning but E0599 if removed.
Left as-is with explanatory comment rather than chasing the lint.
All 79 remaining unit tests + 3 integration tests still pass. Cargo
build --release clean.
Add lightweight per-second pipeline statistics for stutter diagnosis:
- --stats CLI flag enables structured stats logging
- PipelineStats tracks capture/encode/send timing with p95/pmax
- FrameTimings records import/scale/transfer/sws/encode per-frame
- StatsSnapshot produces one structured log line per second
Add a second capture backend for compositors without wlr-screencopy
(KWin, GNOME, etc.) using the xdg-desktop-portal ScreenCast interface
and PipeWire DMA-BUF streaming.
New files:
- src/backend_detect.rs: auto-detect wlr-screencopy vs portal backend
- src/cap_portal.rs: Portal session setup + PipeWire DMA-BUF thread
- src/state_portal.rs: StatePortal encoder pipeline (DMA-BUF → VAAPI)
Changes:
- Cargo.toml: add ashpd 0.13, tokio 1, pipewire 0.9, libspa 0.9,
crossbeam-channel 0.5
- src/args.rs: add --backend CLI flag
- src/avhw.rs: extract create_encoder() from inline State code
- src/main.rs: route to portal or wlr-screencopy based on backend
- src/state.rs: fix params.destroy() on dup failure, cleanup
in_flight_surface on copy fail, use create_encoder()
- tests/integration_test.rs: add --backend flag tests
dailz