The sc_app_core static library was always compiled with SC_HAS_SENDER=1,
pulling CaptureFactory into receiver-only builds where the capture
backend does not exist. Three fixes:
- sc_app_core's cpp_args and capture dependency now follow the sender
meson option, so pipelines.cpp and sender_session.cpp compile their
sender code out on receiver-only targets.
- sender_session.cpp is fully guarded by SC_HAS_SENDER; its body is
sender pipeline orchestration and has no business in a receiver.
- address_preference moved from a SenderSession static to a free inline
function in sender_session.h — run_discover (available in every
build) uses it for address sorting.
Also: the root meson.build now errors early if gui=true without
sender=true (the GUI is a sender panel).
Verified: meson test 5/5 in both configurations; the receiver-only
binary refuses --send with a clear message; the full build's sender,
GUI, and tests are unchanged.
The receiver does not need the sender's PipeWire/xdg-desktop-portal
capture stack, which small ARM boards neither have nor want. Add a
-Dsender=false meson option that skips the capture backend and the
sender pipeline (SC_HAS_SENDER guards in main.cpp/pipelines.cpp);
receiver-only builds refuse --send with a clear message while
--receive and --discover work unchanged.
scripts/install-receiver.sh targets such boards (e.g. Raspberry Pi
Zero 2 W): installs build and runtime dependencies via apt, checks the
compiler for C++20 <format> support before the long build (GCC 13+,
i.e. Raspberry Pi OS Trixie), builds SDL3 from source when the distro
does not package it, compiles a receiver-only binary, runs the test
suite, installs to /usr/local/bin, and enables avahi-daemon.
Also refresh the stale README (phases, dependencies, current
roadmap, Pi receiver section).
Validated in both configurations: meson test 5/5 each; the
receiver-only build has no PipeWire/portal references, refuses --send
cleanly, and --discover works headlessly.
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.
fegger