feat(capture): implement Phase 3 PipeWire/portal desktop capture

Implement the xdg-desktop-portal ScreenCast backend via libportal: a
blocking portal handshake (interactive source picker), a PipeWire stream
on the portal's node enumerating BGRx/BGRA/RGBx/RGBA, and a latest-frame
slot handing frames to next_frame(). stop() is thread-safe; teardown
follows the order PipeWire requires. All proxy operations run under the
thread-loop lock to satisfy the protocol extension context checks
('impl_ext_end_proxy called from wrong context' otherwise).

The encoder now accepts padded strides for packed RGB inputs (real
PipeWire row pitches) and maps the new PixelFormat::Bgrx to
AV_PIX_FMT_BGRA.

Add tools/capture_smoke: a manual smoke tool (interactive, not in
meson test) that captures N frames, encodes them, and writes a
self-contained Annex-B elementary stream with prepended SPS/PPS.

Validated manually on Wayland/Hyprland: 2256x1504 H.264 elementary
stream, ffprobe clean. Phase 3 marked complete in docs/PHASES.md.

This commit is contained in:

Florian Egger

2026-09-07 10:37:14 +02:00

parent ac9dc02b51

commit ce52f64e52

11 changed files with 883 additions and 55 deletions

									
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				# Manual smoke tools. These are not registered with `meson test` because they

				# need an interactive desktop session (portal consent dialog).

				executable('capture_smoke',

				    'capture_smoke.cpp',

				    dependencies : [sc_capture_dep, sc_codec_dep])