fegger
fb6a1087d5
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.
120 lines
4.4 KiB
Bash
Executable File
120 lines
4.4 KiB
Bash
Executable File
#!/usr/bin/env bash
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#
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# install-receiver.sh — build and install the screencast RECEIVER on a
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# small ARM board (e.g. a Raspberry Pi Zero 2 W).
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#
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# Why a separate script: the sender pulls in PipeWire and the
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# xdg-desktop-portal capture stack, which a headless receiver board neither
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# has nor needs. This script configures the build with -Dsender=false so
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# only the receiver binary is compiled.
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#
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# Usage (from the repository root, on the target machine):
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#
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# sudo ./scripts/install-receiver.sh
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#
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# Environment overrides:
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# SC_RECEIVER_INSTALL_DIR install target (default /usr/local/bin)
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# SC_RECEIVER_SKIP_TESTS set to 1 to skip the test suite (faster install)
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#
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# Requirements:
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# - Debian/Raspberry Pi OS (apt) with GCC 13 or newer (the code uses
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# C++20 <format>; Raspberry Pi OS Trixie or newer ships a suitable GCC)
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# - a running avahi-daemon (installed and enabled by this script)
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# - a graphical session or KMS console for the receiver window
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set -euo pipefail
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REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
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BUILD_DIR="${REPO_ROOT}/build-receiver"
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INSTALL_DIR="${SC_RECEIVER_INSTALL_DIR:-/usr/local/bin}"
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SKIP_TESTS="${SC_RECEIVER_SKIP_TESTS:-0}"
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log() { printf '\n=== %s\n' "$*"; }
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die() { printf 'install-receiver: error: %s\n' "$*" >&2; exit 1; }
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[ "$(id -u)" = 0 ] || die "run with sudo (installs to ${INSTALL_DIR})"
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[ -f "${REPO_ROOT}/meson.build" ] || die "run from the screen_cast repository"
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command -v apt-get >/dev/null 2>&1 || die "this script supports apt-based systems only"
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export DEBIAN_FRONTEND=noninteractive
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# --- build and runtime dependencies -----------------------------------------
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log "installing build and runtime dependencies (this may take a while)"
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apt-get update -qq || apt-get update
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apt-get install -y --no-install-recommends \
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build-essential \
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meson \
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ninja-build \
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pkg-config \
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libavcodec-dev \
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libavutil-dev \
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libswscale-dev \
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nlohmann-json3-dev \
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libavahi-client-dev \
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avahi-daemon \
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ca-certificates
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# The receiver renders with SDL3. Older releases do not package it; build a
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# minimal SDL3 from source in that case.
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if ! apt-get install -y --no-install-recommends libsdl3-dev; then
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log "libsdl3-dev is not packaged; building SDL3 from source (15-30 min on small boards)"
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apt-get install -y --no-install-recommends cmake git
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SDL_DIR="$(mktemp -d)"
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trap 'rm -rf "${SDL_DIR}"' EXIT
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git clone --depth 1 --branch release-3.2.x \
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https://github.com/libsdl-org/SDL.git "${SDL_DIR}/SDL"
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cmake -S "${SDL_DIR}/SDL" -B "${SDL_DIR}/build" \
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-DCMAKE_BUILD_TYPE=Release \
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-DSDL_TESTS=OFF \
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-DSDL_INSTALL_DOCS=OFF \
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-DSDL_EXAMPLES=OFF
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cmake --build "${SDL_DIR}/build" --parallel "$(nproc)"
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cmake --install "${SDL_DIR}/build"
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fi
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# --- compiler sanity check ---------------------------------------------------
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log "checking the compiler for C++20 <format> support"
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if ! printf '#include <format>\nint main() { return 0; }\n' |
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g++ -std=c++20 -x c++ - -o /dev/null 2>/dev/null; then
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die "g++ lacks C++20 <format>; install GCC 13 or newer (Raspberry Pi OS \
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Trixie or newer ships one). Aborting before a long build."
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fi
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# --- build the receiver ------------------------------------------------------
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log "configuring a receiver-only build in ${BUILD_DIR}"
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rm -rf "${BUILD_DIR}"
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meson setup "${BUILD_DIR}" "${REPO_ROOT}" -Dsender=false
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log "compiling (this takes a few minutes on small boards)"
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meson compile -C "${BUILD_DIR}"
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if [ "${SKIP_TESTS}" != "1" ]; then
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log "running the test suite"
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meson test -C "${BUILD_DIR}" --print-errorlogs
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fi
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# --- install -----------------------------------------------------------------
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log "installing the receiver to ${INSTALL_DIR}"
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install -m 755 "${BUILD_DIR}/src/app/screencast" "${INSTALL_DIR}/screencast"
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systemctl enable --now avahi-daemon 2>/dev/null || true
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log "done."
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cat <<'EOF'
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The receiver is installed. On this machine run:
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screencast --receive
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and on the sending machine:
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screencast --send # discovers this receiver on the LAN
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Notes for small boards (e.g. Pi Zero 2 W):
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- Decoding is software H.264; expect smooth playback for small streams
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and a lower frame rate at high resolutions.
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- Stop the receiver with Ctrl-C; never kill -9 (it would leave stale
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mDNS records that break discovery for ~75 minutes).
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- The receiver needs avahi-daemon (enabled) and a graphical session or
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KMS console to open its window.
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EOF |