Add handle end_engine message

Author: Rados13

assets/js/membraneWebRTC.ts

@@ -296,7 +296,7 @@ export class MembraneWebRTC {
 
       case "peerLeft":
         peer = this.idToPeer.get(deserializedMediaEvent.data.peerId)!;
-        if (peer.id === this.getPeerId()) return;
+        if (peer === undefined || peer.id === this.getPeerId()) return;
         Array.from(peer.trackIdToMetadata.keys()).forEach((trackId) =>
           this.callbacks.onTrackRemoved?.(this.trackIdToTrack.get(trackId)!)
         );

lib/membrane_rtc_engine/engine.ex

@@ -444,6 +444,19 @@ defmodule Membrane.RTC.Engine do
      }}
   end
 
+  @impl true
+  def handle_playing_to_prepared(ctx, state) do
+    {actions, state} =
+      state.peers
+      |> Map.keys()
+      |> Enum.reduce({[], state}, fn peer_id, {all_actions, state} ->
+        {actions, state} = remove_peer(peer_id, ctx, state)
+        {all_actions ++ actions, state}
+      end)
+
+    {{:ok, actions}, state}
+  end
+
   @impl true
   @decorate trace("engine.other.register", include: [[:state, :id]])
   def handle_other({:register, pid}, _ctx, state) do