Ensure encryption transforms are set up as soon as sender is created (livekit#1561)

Author: lukasIO

.changeset/sixty-pianos-shout.md

@@ -0,0 +1,5 @@
+---
+"livekit-client": patch
+---
+
+Ensure encryption transforms are set up as soon as sender is created

src/e2ee/E2eeManager.ts

@@ -221,8 +221,9 @@ export class E2EEManager
           this.room.localParticipant.identity,
         );
       });
-    room.localParticipant.on(ParticipantEvent.LocalTrackPublished, async (publication) => {
-      this.setupE2EESender(publication.track!, publication.track!.sender!);
+
+    room.localParticipant.on(ParticipantEvent.LocalSenderCreated, async (sender, track) => {
+      this.setupE2EESender(track, sender);
     });
 
     keyProvider

src/room/events.ts

@@ -429,6 +429,11 @@ export enum ParticipantEvent {
    */
   LocalTrackUnpublished = 'localTrackUnpublished',
 
+  /**
+   * @internal
+   */
+  LocalSenderCreated = 'localSenderCreated',
+
   /**
    * Participant metadata is a simple way for app-specific state to be pushed to
    * all users.

src/room/participant/LocalParticipant.ts

@@ -1169,6 +1169,7 @@ export default class LocalParticipant extends Participant {
       }
 
       track.sender = await this.engine.createSender(track, opts, encodings);
+      this.emit(ParticipantEvent.LocalSenderCreated, track.sender, track);
 
       if (isLocalVideoTrack(track)) {
         opts.degradationPreference ??= getDefaultDegradationPreference(track);

src/room/participant/Participant.ts

@@ -403,6 +403,7 @@ export type ParticipantEventCallbacks = {
   trackUnmuted: (publication: TrackPublication) => void;
   localTrackPublished: (publication: LocalTrackPublication) => void;
   localTrackUnpublished: (publication: LocalTrackPublication) => void;
+  localSenderCreated: (sender: RTCRtpSender, track: Track) => void;
   participantMetadataChanged: (prevMetadata: string | undefined, participant?: any) => void;
   participantNameChanged: (name: string) => void;
   dataReceived: (payload: Uint8Array, kind: DataPacket_Kind) => void;