livekit/proto/rtc.proto

syntax = "proto3";

package livekit;
option go_package = "github.com/livekit/livekit-server/proto/livekit";

import "model.proto";

message SignalRequest {
  oneof message {
    // initial join exchange, for publisher
    SessionDescription offer = 1;
    // participant answering publisher offer
    SessionDescription answer = 2;
    TrickleRequest trickle = 3;
    AddTrackRequest add_track = 4;
    // mute the participant's own tracks
    MuteTrackRequest mute = 5;
    // mute a track client is subscribed to
    MuteTrackRequest mute_subscribed = 6;
  }
}

message SignalResponse {
  oneof message {
    // sent when join is accepted
    JoinResponse join = 1;
    // sent when server answers publisher
    SessionDescription answer = 2;
    // sent when server is sending subscriber an offer
    SessionDescription offer = 3;
    // sent when an ICE candidate is available
    TrickleRequest trickle = 4;
    // sent when participants in the room has changed
    ParticipantUpdate update = 5;
    // sent to the participant when their track has been published
    TrackPublishedResponse track_published = 6;
    // list of active speakers
    ActiveSpeakerUpdate speaker = 7;
  }
}

enum SignalTarget {
  PUBLISHER = 0;
  SUBSCRIBER = 1;
}

message AddTrackRequest {
  // client ID of track, to match it when RTC track is received
  string cid = 1;
  string name = 2;
  TrackType type = 3;
}

message TrickleRequest {
  string candidateInit = 1;
  SignalTarget target = 2;
}

message MuteTrackRequest {
  string sid = 1;
  bool muted = 2;
}

message NegotiationRequest {
  // empty
}

message JoinResponse {
  Room room = 1;
  ParticipantInfo participant = 2;
  repeated ParticipantInfo other_participants = 3;
  string server_version = 4;
}

message TrackPublishedResponse {
  string cid = 1;
  TrackInfo track = 2;
}

message SessionDescription {
  string type = 1; // "answer" | "offer" | "pranswer" | "rollback"
  string sdp = 2;
}

message ParticipantUpdate {
  repeated ParticipantInfo participants = 1;
}

message ActiveSpeakerUpdate {
  repeated SpeakerInfo speakers = 1;
}

message SpeakerInfo {
  string sid = 1;
  // audio level, 0-1.0, 1 is loudest
  float level = 2;
  // true if speaker is currently active
  bool active = 3;
}