7786362972
Covers prerequisites (alsa-lib-devel on Fedora / libasound2-dev on Debian), default vs --no-default-features build, the three binaries with concrete invocations, the TUI keybindings and --preset CLI aliases, a sketch of the architecture, and beat-detector tuning notes. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
270 lines
11 KiB
Markdown
270 lines
11 KiB
Markdown
# lightcontrol
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Rust tooling for the **c-base mainhall** lighting rig. One TUI for animated
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presets driving the whole hall via `dmxbackend`, plus two focused one-shot
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binaries for the wall panels and the SonicPulse LED bars.
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Talks to:
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- **dmxbackend** at `dmx.cbrp3.c-base.org:8000` (REST + WebSocket) for the
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48 DMX-routed fixtures.
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- **matelight** at `matelight.cbrp3.c-base.org:8081` (`/monitor` WS,
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subprotocol `matemon`) for live pixel sync of the hall lights to whatever
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is playing on the Mate-crate display.
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- **ArtNet** node at `10.0.0.146:6454` (default) for the Stairville
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SonicPulse LED bars that aren't on `dmxbackend`.
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The local microphone, optionally, for beat-driven scenes.
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---
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## Quick start
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```bash
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# prerequisites (Fedora):
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sudo dnf install rustup alsa-lib-devel pkgconf-pkg-config
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rustup-init -y && source "$HOME/.cargo/env"
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# build everything
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cargo build --release
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# fire up the TUI against the live rig
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./target/release/lightcontrol
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```
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On Debian/Ubuntu the equivalent of `alsa-lib-devel` is
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`libasound2-dev`. If you don't want microphone support and can't or won't
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install ALSA dev libs, see [No-mic build](#no-mic-build) below.
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---
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## Build
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The default build enables the `mic` cargo feature, which pulls in
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[`cpal`](https://crates.io/crates/cpal) and through it the system ALSA
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library. The TUI's beat-detector and the `BeatPulse` preset rely on it.
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```bash
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cargo build --release # default: TUI + panels + bars + mic
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```
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### No-mic build
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```bash
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cargo build --release --no-default-features
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```
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Identical behaviour except the BeatPulse preset shows a slow cyan
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"waiting for mic" heartbeat instead of reacting to audio. Useful on
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build hosts that don't have ALSA dev headers, or on machines with no
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audio input.
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### Quick checks
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```bash
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cargo test # unit tests for presets + detector
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cargo clippy --all-targets -- -D warnings
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```
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---
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## Binaries
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### `lightcontrol` — main TUI
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Animated presets driving every fixture in the mainhall through
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`dmxbackend`'s `/api/v1/websocket_state/` at 25 fps.
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```bash
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./target/release/lightcontrol # interactive TUI
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./target/release/lightcontrol --preset rainbows # launch straight in
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./target/release/lightcontrol --check # dump fixture list
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./target/release/lightcontrol --host dmx.example:8000 # different backend
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./target/release/lightcontrol --matelight ws://.../monitor # custom mate
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```
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Environment variables:
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- `DMX_HOST` — overrides `--host`
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- `MATELIGHT_URL` — overrides `--matelight`
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The TUI shows a header (host, fixture count, FPS, matelight + mic status),
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a live **beat detector panel** (flash bar + BPM + envelope sparkline), and
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the preset list with the active preset highlighted.
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#### Keys
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| Key | Preset |
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|-----|--------|
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| `1` | Rainbows |
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| `2` | Blue House |
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| `3` | 70th Disco |
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| `4` | Jungle |
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| `5` | Lasertec |
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| `6` | Police |
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| `7` | Mirror Ball (blue fade) |
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| `8` | Morning Light (sunrise) |
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| `9` | Orange/Green Mirror Ball |
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| `m` | Matelight Sync (live) |
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| `s` | Gabba Strobe (white, fast) |
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| `r` | Red Strobe (fast) |
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| `L` | Blue Strobe (fast) — capital L; `b` is blackout |
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| `p` | Pink Strobe (fast) |
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| `k` | Beat Pulse (mic-driven) |
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| `0` / `b` | Blackout |
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| `↑` / `↓` + `Enter` | Navigate list |
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| `q` / `Esc` / `Ctrl-C` | Quit |
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#### `--preset` CLI aliases
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Lower-cased and matched verbatim — useful for shell scripting / OBS
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integration:
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| Preset | Aliases |
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|--------|---------|
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| Rainbows | `rainbow`, `rainbows`, `1` |
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| Blue House | `blue`, `bluehouse`, `blue-house`, `2` |
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| 70th Disco | `disco`, `disco70`, `70th`, `70th-disco`, `3` |
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| Jungle | `jungle`, `4` |
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| Lasertec | `lasertec`, `laser`, `5` |
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| Police | `police`, `polizei`, `6` |
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| Mirror Ball | `mirror`, `mirrorball`, `mirror-ball`, `discoball`, `kugel`, `7` |
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| Morning Light | `morning`, `sunrise`, `dawn`, `sonnenaufgang`, `morgen`, `8` |
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| Orange/Green Ball | `orangegreen`, `orange-green`, `orange`, `green`, `kürbis`, `9` |
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| Matelight Sync | `matelight`, `mate`, `sync`, `m` |
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| Gabba Strobe | `gabba`, `strobe`, `strobo`, `stroboscope`, `s` |
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| Red Strobe | `red`, `rot`, `redstrobe`, `r` |
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| Blue Strobe | `blau`, `bluestrobe`, `blue-strobe`, `l` |
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| Pink Strobe | `pink`, `magenta`, `pinkstrobe`, `p` |
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| Beat Pulse | `beat`, `beatpulse`, `kick`, `mic`, `audio`, `k` |
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| Blackout | `off`, `blackout`, `0` |
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#### Beat detector panel
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```
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┌─ beat detector ────────────────┬─ envelope (last ~4 s) ─────────────────┐
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│ BEAT █████████████ │ ▂▃▆▇▆▃▁▂▇▆▃▁▂▇▆▃▁▂▃▆▇▆▃▁▂▇▆▃▁▂▇▆▃▁▂ │
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│ level ████████████░░░░░░░░ │ │
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│ 128.4 BPM beats=47 last 0.08s ago │ │
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└────────────────────────────────┴────────────────────────────────────────┘
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```
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The flash bar fires on every detected beat in the current per-beat hue
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palette. The level bar is the live short-window envelope. The sparkline
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plots the last ~4 seconds of envelope at 20 Hz, scaled with a ×2.5
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boost so quiet rooms still show shape.
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**Pre-show diagnostic:** put on the playlist, look at the panel. Solid
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BPM + regular flashes → detector locked. No flashes → mic not picking
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up, check `pavucontrol` recording tab. Constant strobing → too much
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noise, raise `MIN_DELTA` in `src/beat.rs` (default `0.020`, try
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`0.035`).
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### `panels` — Showtec PAR 56 wall panels (one-shot)
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Hits the `LED Par 56` fixtures via `dmxbackend`'s WebSocket, sends one
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frame, exits. Useful for setup checks or quick scene calls from a
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script.
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```bash
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./target/release/panels --color red # red wash
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./target/release/panels --color "#1a3f8f" --dim 180 # custom hex + dimmer
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./target/release/panels --color off # blackout
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./target/release/panels --dry-run --color magenta # print, don't send
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```
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Colors: `red`, `green`, `blue`, `white`, `yellow`, `orange`, `magenta`,
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`cyan`, `off`, or any `#RRGGBB`.
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### `bars` — Stairville SonicPulse LED Bar 10 (ArtNet direct)
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The bars aren't routed through `dmxbackend`, so this one talks ArtNet
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UDP directly to the node at `10.0.0.146:6454` (4 bars × 39 channels =
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156 channels in universe 2).
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```bash
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./target/release/bars --color magenta # paint all 4 bars
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./target/release/bars --color "#ff5500" --dim 200
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./target/release/bars --poll # ArtPoll discovery
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./target/release/bars --sweep 0-15 # walk universes 0-15 to find them
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./target/release/bars --broadcast --color blue # broadcast if unicast fails
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./target/release/bars --dry-run --color red # print the packet, don't send
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```
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If `--color` does nothing visible: try `--poll` first to confirm the
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node is on the LAN, then `--sweep` to find which universe the bars
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actually listen on. The factory default is 0; many nodes are set to
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different universes per harness.
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---
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## Architecture
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```
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┌──────────────────────────┐
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│ c-base mainhall lights │
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└──────────────────────────┘
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▲ ▲
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DMX over │ │ ArtNet (UDP/6454)
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│ │ → 10.0.0.146 → 4 SonicPulse bars
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│ │
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┌────────────────────┴──┐ │
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│ dmxbackend (aiohttp) │ │
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│ dmx.cbrp3:8000 │ │
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│ REST /api/v1/... │ │
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│ WS /api/v1/ │ │
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│ websocket_state │ │
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└────────┬──────────────┘ │
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│ │
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┌────────┴────────────────┴──┐
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│ lightcontrol (this repo) │
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│ │
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│ ┌─────────┐ ┌─────────┐ │ ws://matelight:8081
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│ │ engine │ │ matelight ─────────────/monitor (matemon)
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│ │ (presets│ │ feeder │ │ binary RGB frames →
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│ │ @25fps)│ │ │ │ drive hall via sample
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│ └────┬────┘ └─────────┘ │
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│ │ │ local microphone (cpal)
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│ │ ┌─────────┐ │ ←───────────────────────
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│ ├──────┤ beat │ │ energy-onset detector
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│ │ │ detector│ │ → BeatPulse preset
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│ │ └─────────┘ │
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│ ▼ │
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│ binaries: │
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│ lightcontrol (TUI) │
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│ panels (one-shot) │
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│ bars (ArtNet, ad-hoc) │
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└────────────────────────────┘
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```
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Source layout:
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- `src/lib.rs` — shared types (Fixture/Element/Channel), HTTP client,
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re-exports.
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- `src/presets.rs` — the 15 animated presets + render dispatch.
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- `src/matelight.rs` — matelight `/monitor` WebSocket feeder + frame
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sampler.
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- `src/beat.rs` — cpal capture + energy-onset beat detector (feature
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`mic`).
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- `src/main.rs` — TUI binary, engine loop, key handling.
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- `src/bin/panels.rs` — wall panels one-shot.
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- `src/bin/bars.rs` — SonicPulse ArtNet driver.
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---
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## Tuning notes
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- **Mic input device.** On laptops with both built-in mic and a desk
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feed, PulseAudio/PipeWire may pick the wrong one. Fix in
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`pavucontrol` → Recording tab while `lightcontrol` is running.
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- **Beat sensitivity.** `src/beat.rs` constants:
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- `THRESHOLD` (default `1.35`) — ratio of short to long envelope.
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Higher = stricter.
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- `MIN_DELTA` (default `0.020`) — absolute energy rise required.
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Suppresses warmup-window false triggers and quiet-room noise.
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- `MIN_INTERVAL_MS` (default `200`) — caps detected BPM at 300.
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- **Matelight unreachable.** TUI header will show
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`matelight: connecting…` or the last error. `lightcontrol` reconnects
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every 3 s. The Matelight preset falls back to a slow dim-white pulse
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meanwhile.
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- **Photosensitivity.** Gabba/Red/Blue/Pink strobes are hard 12.5 Hz
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square-wave alternations at the engine's Nyquist rate. Don't fire
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them at a crowd that hasn't been warned.
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