Wire the first end-to-end pipeline: capture -> encode -> packetize ->
UDP -> depacketize -> decode -> render.
- UdpRtpTransport: raw POSIX UDP sockets (IPv4 via getaddrinfo), a
receive jthread woken by socket close on stop; port 0 skips binding
so the sender uses an OS-assigned source port. ASIO stays deferred
to the signaling phase per ARCHITECTURE.md.
- SdlRenderer: SDL3 window/renderer with RGBA texture upload; the
texture is recreated on resolution change. RendererFactory now
returns RendererResult so SDL init failures carry a message,
mirroring the codec/capture error patterns.
- screencast binary: parse_cli plus SenderPipeline/ReceiverPipeline
per the app scaffolds; the sender creates its encoder once capture
reports real dimensions, the receiver keeps a bounded 3-frame queue
to hold latency down and renders on its own thread until the window
closes. cli argv signature fixed to 'const char* const*' so main's
argv converts implicitly.
- Encoder: drop AV_CODEC_FLAG_GLOBAL_HEADER so libx264 repeats SPS/PPS
in-band at each keyframe -- the receiver decodes from the bitstream
alone, which also makes mid-stream joins and later PLI recovery
work without out-of-band parameter negotiation. The round-trip test
now exercises exactly that path.
- tests: new udp-loopback integration test pushes synthetic frames
through a real localhost socket and decodes 10/10 frames with the
right dimensions; valgrind clean (loopback + codec). meson test 4/4.
Manual validation on the desktop (receiver window shows the captured
desktop) is documented in docs/RUNBOOK.md.
Add the sc_network library: RFC 3550 RtpHeader/RtpPacket serialize and
parse (the receiver tolerates CSRC lists, extension headers, and
padding by skipping/stripping them) and RFC 6184 H.264 payloading via
H264Packetizer/H264Depacketizer.
The packetizer splits Annex-B frames into NAL units (3- and 4-byte
start codes), emitting single-NAL packets or FU-A fragments within the
configured MTU, with the marker bit closing each frame and randomized
SSRC/sequence by default. The depacketizer reassembles access units
with 3-byte start codes, so both start-code widths round-trip
byte-exactly; frames damaged by sequence gaps or missing fragments
are dropped until the Phase 7 loss-recovery work.
test_rtp covers header and packet round-trips, malformed-input
rejections, splitter behavior, FU-A chunk bounds, full packetize ->
depacketize round-trip, gap dropping, marker-only frame separation,
sequence wrap, and empty inputs. meson test 3/3, valgrind clean.
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.
Replace the nullable unique_ptr returned by CaptureFactory::create()
with CaptureResult<std::unique_ptr<CaptureSession>> using the new
CaptureError/CaptureResult pattern, mirroring codec/error.h. The stub
now reports 'not implemented yet' as an error instead of returning
nullptr. Update handoff memory with the review outcome and
forward-looking notes for phases 3, 5, and 7.
Allocate packet payloads with av_new_packet so they are freed through the
owning AVBufferRef instead of leaking on every decode. Pad extradata with
AV_INPUT_BUFFER_PADDING_SIZE for FFmpeg's bitstream parsers. Reject
oversized frames before the int cast, handle unexpected EOF in the
EAGAIN-retry loops, and add the missing <limits> include. Document the
valgrind codec check in docs/RUNBOOK.md.
Validated with valgrind: 0 bytes definitely lost, 0 invalid reads.
Add a linkable CaptureFactory stub so the capture API can be consumed
without unresolved symbols. Change remaining config string_view fields to
std::string to prevent dangling references. Update handoff memory.
Add FFmpeg-based encoder/decoder with SPS/PPS extradata, Annex-B output
normalization, low-latency libx264 settings, and a round-trip unit test.
Includes review hardening: cached SwsContext, bitrate-only rate control,
std::byte/uin8_t cast helpers, and richer test assertions.
fegger