# Lotus fork of Element Call This fork is embedded by [Lotus Chat](https://code.lotusguild.org/LotusGuild/cinny) (cinny) as the in-app call frame. Everything it adds is opt-in: without the URL flags and widget actions below it behaves like upstream Element Call. The source of truth is `src/lotus/` (the `io.lotus.*` actions are declared in `src/lotus/lotusActions.ts`). Keep this file in step with it: when the host and the fork drift, features fail silently (element-call#43, cinny#260). ## URL flags The host sets these on the widget URL (cinny: `CallEmbed.getWidget`). | Flag | Effect | | ------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | `lotusCallState=true` | Stream call state to the host: `io.lotus.call_state` (participants, speaking, mute) and `io.lotus.mic_level`. | | `lotusTheme=true` | Apply the host theme; the frame's root `color-scheme` follows it. | | `lotusTransparent=true` | Transparent canvas so the host's wallpaper shows through. Only meaningful with `lotusTheme` (the fork applies it anyway and warns). | | `lotusHostControls=true` | The host draws the call bar: hide Element Call's footer and enable the host-control actions. | | `lotusFrameScreenshare=true` | With `lotusHostControls`: show the frame's own screenshare button, for engines without Capability Delegation (Firefox, Safari) where the host can't start a share. | | `lotusAudioInject=true` | Accept `io.lotus.inject_audio` (soundboard). | | `lotusDenoiseSource=true` | Run ML noise suppression in-source as a LiveKit audio TrackProcessor. | | `lotusModel=rnnoise\|speex\|dtln\|deepfilternet` | Denoise model (default `rnnoise`; falls back to `rnnoise` once if the chosen model fails). | | `lotusGate=true`, `lotusGateThreshold=` | Noise gate after denoise (default −45 dB). | | `lotusDenoiseFloor=<0..1>` | Denoise mix floor. | | `lotusDenoiseBase=` | Where the denoise worklets / wasm / models are served (same-origin by default: `./denoise/`). | | `sendNotificationType=none` | Upstream param, extended: `none` sends no call-start notification at all (cinny#295; voice channels shouldn't @room-ping). | ## Widget actions (`io.lotus.*`) "host → call" actions must be allow-listed in `LOTUS_TO_WIDGET_ACTIONS`. The table is generated from `src/lotus/lotusActions.ts`; the last column was checked against cinny's `lotus` branch. | Action | Direction | Payload / meaning | Handled by cinny (`lotus`) | | -------------------------------- | ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------- | | `io.lotus.call_state` | call → host | in-call per-participant speaking / mute state. NOTE: matrix-widget-api `transport.send` is request/response — the host MUST register a handler that replies/acks each one (cinny's `listenAction` does, replying `{}`). If the host has no handler, ClientWidgetApi immediately error-replies "unsupported from-widget action", so the data is silently dropped and each throttled send rejects (caught) — functional miss + log churn, not a hang. | yes | | `io.lotus.focus_participant` | host → call | pin/spotlight (or clear, with userId=null) a participant. | yes | | `io.lotus.inject_audio` | host → call | play an audio clip into the call as a separate published track. | yes | | `io.lotus.set_quality` | host → call | set audio/screenshare encoding quality (bitrate/framerate). | yes | | `io.lotus.decorations` | host → call | per-user avatar-decoration image URLs for in-call tiles. | yes | | `io.lotus.set_deafen` | host → call | deafen remote audio (and optionally mute screenshare audio). | yes | | `io.lotus.request_state` | call → host | sent on (re)registration of a lotus toWidget handler (e.g. decorations) so the host can re-push state that would otherwise only be sent on change (decorations roster, the current focus pin) after an EC-side reconnect/remount. cinny's `resendForkState()` should respond to this the same way it responds to a fresh join. | yes | | `io.lotus.denoise_state` | call → host | real state of the in-source denoise engine — `{ active: boolean, model: string, error?: string }` — sent once the processor attaches (or after the rnnoise fallback also fails), so the host toggle can reflect reality rather than the requested state. | yes | | `io.lotus.call_summary` | call → host | one-shot end-of-call readout for the local participant — `{ durationMs, reconnects, poorMs, verdict }` (#143) — sent on SFU disconnect or in-call teardown, whichever comes first. | yes | | `io.lotus.set_audio_output` | host → call | select the audio output device `{ deviceId }` (#119). | yes | | `io.lotus.audio_output_state` | call → host | the currently selected output `{ deviceId }` (#119). | cinny #417 | | `io.lotus.screenshare_notice` | call → host | local screenshare reminder `{ kind: "ended" \| "no-frames" \| "alone" }` — window closed, no frames for 15 s, or 30 min of sharing with nobody else in the call (#39). Each fires at most once per share. | yes | | `io.lotus.set_layout` | host → call | switch the call layout `{ layout: "grid" \| "spotlight" }` (cinny #43 — replaces the host clicking EC's hidden layout radio). | yes | | `io.lotus.open_settings` | host → call | open EC's settings modal, or close it with `{ open: false }`; omit `open` to toggle (cinny #43). | yes | | `io.lotus.toggle_reactions` | host → call | toggle the reactions / raise-hand menu (cinny #43). | yes | | `io.lotus.set_screenshare` | host → call | start/stop sharing `{ on?: boolean }` (omit to toggle; cinny #43). Starting calls getDisplayMedia, which needs the user's click: the host sends this with Capability Delegation (`delegate: "display-capture"`), and without it the browser rejects the share. | yes | | `io.lotus.set_hotkeys` | host → call | `{ codes: string[] }` — KeyboardEvent.code values (PTT, deafen) to report while focus is inside this frame (cinny #43). `[]` stops. | yes | | `io.lotus.set_frame_screenshare` | host → call | `{ visible: boolean }` — whether the in-frame screenshare button (`lotusFrameScreenshare`) may show, e.g. false while the room's call policy forbids screensharing (cinny #43). Defaults to visible. | yes | | `io.lotus.prompt_screenshare` | host → call | `{}` — show the "Share your screen?" prompt inside this frame (cinny #43). For hosts that can't delegate the user's click: the prompt's Share button is clicked here, so getDisplayMedia gets its activation. | yes | | `io.lotus.hotkey` | call → host | a watched key went down/up here, or this window's focus changed; see `LotusHotkeyReport` (cinny #43). | yes | | `io.lotus.controls_state` | call → host | `{ screensharing: boolean, layout: "grid" \| "spotlight" \| null, screenshareAction: true, hotkeys: true, frameScreenshare: false, screensharePrompt: boolean, screensharePromptOpen: boolean }` whenever either changes (cinny #43), so the host stops reading EC's DOM for them. Its arrival also tells the host this fork supports the actions above. | yes | | `io.lotus.mic_level` | call → host | local mic level `{ bars: 0 \| 1 \| 2 \| 3 }` (cinny #146), sent only when it changes (≤ 10 Hz); 0 while muted or with no mic. | yes | | `io.lotus.call_error` | call → host | the call's error page is up (`{ code, recoverable }`) or cleared (`{ code: null }`) (cinny #318), so the host stops showing the call as joined after "Connection lost". | cinny #418 | | `io.lotus.reconnect` | host → call | press the error page's Reconnect / Try again (cinny #318). | cinny #418 | Entries naming a cinny PR are handled once that PR merges. ## Fork-only behaviour (no flag needed) Per-person volume memory, screenshare notices (window closed / no frames / sharing alone), mono mic capture, an SFU refusal reason instead of "Something went wrong", "Try again" for failed connects, and support for running on its own origin (cinny#43). ## Releasing 1. Merge the change into `lotus`. 2. Bump `version` in `embedded/web/package.json` (`0.25.0-lotus.N`), commit `chore(lotus): 0.25.0-lotus.N` on `lotus`, and push a tag `v0.25.0-lotus.N`. 3. CI builds the embedded bundle and, for `v*` tags, publishes `@lotusguild/element-call-embedded` to the Gitea npm registry (`https://code.lotusguild.org/api/packages/LotusGuild/npm/`). 4. In cinny, pin the exact version in `package.json` (`npm install --save-exact @lotusguild/element-call-embedded@0.25.0-lotus.N`) and open a PR.