# sfxkeeb

Annotate keyboard key presses on a video timeline and preview/export mechanical switch sounds mixed with the video audio.

Keyboard sounds are sourced from [kbsim](https://github.com/tplai/kbsim) (MIT license) — recorded press and release samples with per-key variation.

## Requirements

- Node.js 18+ and npm
- **git** (to fetch kbsim sample assets)

## Setup

```bash
# Frontend dependencies
cd frontend && npm install
```

## Development

```bash
cd frontend && npm run dev
```

Open http://localhost:5173

## Production

```bash
cd frontend && npm run build && npm run preview
```

Or serve `frontend/dist` with any static file host.

## Usage

1. **Open Video** — load an MP4 file
2. Press keys while the playhead is at the desired time to add markers (works while playing or paused)
   - Press sound plays on keydown; release sound plays on keyup
   - Each physical key maps to a stable press variant (same key always sounds the same)
3. Select markers to override keys, nudge with arrow keys, or multi-select with marquee drag
4. Choose a mechanical switch sound from the dropdown (13 kbsim profiles)
5. Adjust preview speed (25–200%) for fast-paced content — preview only; export is always at 1×
6. **Save Project** / **Open Project** — JSON with version, markers, and switch setting (no video path)
7. **Export Audio** — download a WAV file of keyboard sounds only, full video length (rendered client-side)

### Keyboard shortcuts

| Shortcut           | Action                              |
| ------------------ | ----------------------------------- |
| Ctrl+Space         | Play / pause                        |
| Arrow keys         | Nudge selected marker(s) one frame  |
| Alt+Scroll         | Zoom timeline (centers on playhead) |
| Backspace / Delete | Delete selected marker(s)           |
| Ctrl+A             | Select all markers                  |

## Project file format

```json
{
  "version": 2,
  "switch": "mxbrown",
  "markers": [
    {
      "id": "m1",
      "time": 1.234,
      "key": "a",
      "code": "KeyA",
      "releaseTime": 1.312
    }
  ]
}
```

- `time` — press timestamp (seconds)
- `releaseTime` — keyup timestamp; omitted in v1 projects default to press + 80ms at playback/export
- `code` — `event.code` for stable per-key sound mapping (e.g. `KeyA`, `Digit1`)

v1 projects with `cherry-mx-blue` / `cherry-mx-red` / `cherry-mx-brown` switches are migrated automatically.

Re-open the video manually after loading a project file.

## Switch samples

Available profiles from [kbsim](https://github.com/tplai/kbsim):

NovelKeys Creams, Holy Pandas, Alpacas, Turquoise Tealios, Gateron Black Inks, Gateron Red Inks, Cherry MX Blacks, Cherry MX Browns, Cherry MX Blues, Kailh Box Navies, Buckling Spring, SKCM Blue Alps, Topre.

## Attribution

Keyboard sound samples from [tplai/kbsim](https://github.com/tplai/kbsim) by Thomas Lai (MIT license).

## Known limitations

- Frame stepping uses `video.currentTime` and may land on nearest keyframes for some MP4 encodings
- Project files do not reference the video file path
- Very long videos may take longer to export client-side via OfflineAudioContext
