- Protocol module: framed binary encoding for control requests/responses
(ENUM_DEVICES, ENUM_CONTROLS, GET/SET_CONTROL, STREAM_OPEN/CLOSE)
- video-node: scans /dev/media* and /dev/video*, serves V4L2 device
topology and controls over TCP; uses UDP discovery for peer announce
- query_cli: auto-discovers a node, queries devices and controls
- protocol_cli: low-level protocol frame decoder for debugging
- dev/web: Express 5 ESM web inspector — live SSE discovery picker,
REST bridge to video-node, controls UI with sliders/selects/checkboxes
- Makefile: sequential module builds before cli/node to fix make -j races
- common.mk: add DEPFLAGS (-MMD -MP) for automatic header dependencies
- All module Makefiles: split compile/link, generate .d dependency files
- discovery: replace 100ms poll loop with pthread_cond_timedwait;
respond to all announcements (not just new peers) for instant re-discovery
- ENUM_DEVICES response: carry device_caps (V4L2_CAP_*) per video node
so clients can distinguish capture nodes from metadata nodes
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Config_Def schema tables declare section/key/type/default per module.
Typed getters: config_get_str, _u16, _u32, _flags.
FLAGS type parses space/comma-separated tokens via a Config_Flag_Def table.
config_defaults() gives schema defaults without a file.
config_dump() prints effective values for diagnostics.
config_cli: load a file or --defaults and dump effective config.
dev/example.cfg: sample config covering node, discovery, transport.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Sends 6-byte framed announcements to 224.0.0.251:5353 on startup and
every interval_ms (default 5s). Receive thread maintains a peer table
(max 64 entries); fires on_peer_found for new peers, on_peer_lost when
a peer misses timeout_intervals (default 3) consecutive intervals.
Own announcements are filtered by name+site_id. SO_REUSEADDR+REUSEPORT
allows multiple processes on the same host for testing.
discovery_cli: announce <name> <tcp_port> [flags] — prints found/lost events.
Also notes future config module in planning.md.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Removes channel_id from the header. All message-specific identifiers
(stream_id, request_id, etc.) now live at the start of the payload,
interpreted by each message type handler. A relay seeing an unknown
type can skip or forward it using only payload_length, with no
knowledge of the payload structure.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
transport_server_create/start: binds TCP, spawns accept thread, closes
excess inbound connections when max_connections is reached.
transport_connect: outbound TCP, spawns read thread before returning.
transport_send_frame: packs 8-byte header with serial put_*, then writes
header + payload under a per-connection mutex (thread-safe).
Read thread: reads header, validates payload_length <= max_payload, mallocs
payload, calls on_frame (callback owns and must free payload). On error or
disconnect calls on_disconnect then frees conn.
transport_cli: server mode echoes received frames; client mode sends 3
test frames and prints echoes.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
CC, CFLAGS, and BUILD are now defined once in common.mk at the repo root.
Each module and CLI Makefile sets ROOT then includes common.mk, eliminating
the repeated definitions.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
architecture.md: replace JSON control payloads with binary serialization;
add Protocol Serialization section describing little-endian wire format,
put/get buffer layer, and write_*/read_* protocol layer.
planning.md: mark common/media_ctrl/v4l2_ctrl done; insert serial (#4)
and protocol (#6) modules with descriptions.
conventions.md: document -flto and its implication (no manual static for
inlining — compiler handles it at link time).
Makefiles: add -flto to CFLAGS in all four Makefiles.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
The CLI is a separate translation unit that doesn't include <linux/media.h>,
so the kernel flag constants were undefined there. Fix by defining our own
public constants in media_ctrl.h:
- MEDIA_LINK_FL_{ENABLED,IMMUTABLE,DYNAMIC} for link flags
- MEDIA_PAD_FLAG_{SINK,SOURCE} for pad flags (distinct names avoid
redefinition conflict with kernel's MEDIA_PAD_FL_* in media_ctrl.c)
media_ctrl.c now translates kernel flags to our constants on the way out.
Added fallback #defines for kernel constants that were missing them.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Modules (src/modules/):
- common/error: App_Error struct with structured detail union, error codes,
app_error_print(); designed for future upgrade to preprocessor-generated
location codes
- media_ctrl: media device enumeration, topology query (entities/pads/links),
link enable/disable via Media Controller API (/dev/media*)
- v4l2_ctrl: control enumeration (with menu item fetching), get/set via
V4L2 ext controls API, device discovery (/dev/video*)
All modules use -std=c11 -D_GNU_SOURCE, build artifacts go to build/ only.
Kernel-version-dependent constants guarded with #ifdef + #warning.
CLI drivers (dev/cli/):
- media_ctrl_cli: list, info, topology, set-link subcommands
- v4l2_ctrl_cli: list, controls, get, set subcommands
Docs (docs/cli/):
- media_ctrl_cli.md and v4l2_ctrl_cli.md with usage, examples, and
context within the video routing system
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
