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# What does this implement/fix? <!-- Quick description and explanation of changes. --> New plugin provider `milkdrop_visualizer`: renders a MilkDrop (Butterchurn) music visualizer behind the web frontend's now-playing views, driven by the actual audio. - An in-process Sendspin bridge visualizer role (same pattern as Hue Lights Sync) taps the target player's group, computes a 1024-sample waveform tail per audio chunk, and relays the frames plus the beat schedule over an authenticated WebSocket route on the MA webserver. - One shared tap per target player, refcounted by viewers, with a linger window, a frame ring replayed to late joiners, and clock sync so frames render at their scheduled time. - Sendspin provider gets a small new API, `register_headless_client()`, so taps never surface as MA players (no group chips, no UI churn). Requires a WebGL2-capable browser to render. Google Cast receivers do not support WebGL ([Cast docs](https://developers.google.com/cast/docs/ux_guidelines)), so cast dashboards keep their normal background. **Related issue (if applicable):** - https://github.com/music-assistant/frontend/pull/2340 ## Types of changes <!-- Tick exactly one box. CI (.github/workflows/pr-labels.yaml) derives the label from the ticked box and applies it automatically; the release-notes generator uses that same label to slot this change into the next release notes. --> - [ ] Bugfix (non-breaking change which fixes an issue) — `bugfix` - [x] New feature (non-breaking change which adds functionality) — `new-feature` - [ ] Enhancement to an existing feature — `enhancement` - [ ] New music/player/metadata/plugin provider — `new-provider` - [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected) — `breaking-change` - [ ] Refactor (no behaviour change) — `refactor` - [ ] Documentation only — `documentation` - [ ] Maintenance / chore — `maintenance` - [ ] CI / workflow change — `ci` - [ ] Dependencies bump — `dependencies` ## Checklist - [x] The code change is tested and works locally. - [x] `pre-commit run --all-files` passes. - [x] `pytest` passes, and tests have been added/updated under `tests/` where applicable. - [ ] For changes to shared models, the companion PR in `music-assistant/models` is linked. - [x] For changes affecting the UI, the companion PR in `music-assistant/frontend` is linked. - [x] I have read and complied with the project's [AI Policy](https://github.com/music-assistant/.github/blob/main/AI_POLICY.md) for any AI-assisted contributions. - [ ] I have [raised a PR against the documentation repository](https://github.com/music-assistant/music-assistant.io/blob/main/CONTRIBUTING.md) targeting the main or beta branch as appropriate. --------- Co-authored-by: OzGav <[email protected]>