The detached helper thread that called pw_main_loop_quit() through a raw
pointer cast to usize could outlive the mainloop if run() returned on its
own (event loop error, panic in callback, etc.), causing use-after-free.
Replace with an eventfd registered on the PipeWire loop via add_io(). The
shutdown callback runs on the loop thread during mainloop.run(), where the
mainloop is guaranteed alive. Drop order (reverse declaration) ensures the
IO source is unregistered before mainloop is destroyed.
Fixes: #1 (Critical UAF)
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
scale_vaapi defaults to the input sw_format (RGBZ) when no output format
is specified. h264_vaapi encoder only supports NV12/YUV formats.
Adding format=nv12 ensures the filter outputs the correct color format
for hardware encoding.
- registry_queue_init consumes registry events during its internal
roundtrip without forwarding them to Dispatch<WlRegistry>. Added
bind_initial_globals() to manually iterate GlobalList and bind all
initial globals (wl_output, xdg_output_manager, dmabuf, screencopy,
wlr_output_manager) at State::new time.
- Fix av_freep segfault in build_filter_graph: av_buffersrc_parameters_alloc
returns a plain pointer, use av_free instead of av_freep (which expects
pointer-to-pointer).
- Fix filter graph format negotiation: remove software format filter that
broke scale_vaapi hardware pipeline. Chain is now src -> scale -> sink.
- Downgrade repeat_pps error to warning (not available in FFmpeg 6.x).
