Esposter
Overview
Architecture
Products
Packages
Proposals

Per-User Volume

Each remote call participant's action menu (the overflow button on their tile, or their avatar in the participant bar) carries a User Volume slider (0–200%) adjusting only that participant's audio locally — Discord's per-user volume.

How it works

Client-only, in-call state — there is no DB column and no procedure; Discord has no stored panel default for this either. State lives in call/media.ts and dies with the call.

flowchart LR
  slider["User Volume slider<br/>(participant action menu)"] -->|set| map["media.ts<br/>participantVolumePercentageMap"]
  settings[("userSettingsInMessage<br/>speakerVolumePercentage")] --> apply
  map -->|"liveKit.ts watcher"| apply["applyRemoteAudioVolume"]
  apply -->|"HTMLMediaElement.volume"| audio["that participant's<br/>remote audio elements"]
  leave["participant leaves"] -->|delete entry| map
  • participantVolumePercentageMap is keyed by participant id (the auth session id, which is also the LiveKit identity); an absent entry means the 100% default.
  • Effective element volume = min(1, (speakerVolumePercentage / 100) × (participantVolumePercentage / 100)) — HTMLMediaElement.volume caps at 1, so combined values above 100% clamp to full (same limitation as the master speaker volume).
  • The volume resets when the participant leaves (onLeaveCall deletes the map entry) and the whole map clears with the call (resetCallMedia).
  • The action menu keeps close-on-content-click off so dragging the slider doesn't dismiss it; moderation items close it explicitly.

Key files

FileRole
packages/app/app/store/message/room/call/media.tsparticipantVolumePercentageMap + set/delete mutations
packages/app/app/store/message/room/liveKit.tsapplies master × participant volume to remote audio elements
packages/app/app/components/Message/Content/Call/Participant/ActionMenu.vueshared menu: volume slider + moderation actions
packages/app/app/components/Message/Content/Call/Participant/VolumeSlider.vuethe slider bound to the store map
packages/app/app/composables/message/room/call/useCallJoinedSubscribables.tsdeletes the entry on participant leave

Notes

  • No persistence, no server involvement — deliberately the smallest possible feature. If users later ask for remembered per-friend volumes, that becomes a userSettingsInMessage-adjacent design decision, not an extension of this.