Debug

Session/Calls/CallVC.swift

@@ -19,6 +19,12 @@ final class CallVC : UIViewController, WebRTCSessionDelegate {
     }()
     
     // MARK: UI Components
+    private lazy var remoteVideoView: RTCMTLVideoView = {
+        let result = RTCMTLVideoView()
+        result.contentMode = .scaleAspectFill
+        return result
+    }()
+    
     private lazy var fadeView: UIView = {
         let result = UIView()
         let height: CGFloat = 64
@@ -100,8 +106,6 @@ final class CallVC : UIViewController, WebRTCSessionDelegate {
     
     func setUpViewHierarchy() {
         // Remote video view
-        let remoteVideoView = RTCMTLVideoView()
-        remoteVideoView.contentMode = .scaleAspectFill
         webRTCSession.attachRemoteRenderer(remoteVideoView)
         view.addSubview(remoteVideoView)
         remoteVideoView.translatesAutoresizingMaskIntoConstraints = false
@@ -148,9 +152,11 @@ final class CallVC : UIViewController, WebRTCSessionDelegate {
     
     // MARK: Interaction
     func handleEndCallMessage(_ message: CallMessage) {
+        print("[Calls] Ending call.")
         WebRTCSession.current?.dropConnection()
         WebRTCSession.current = nil
         UIView.animate(withDuration: 0.25) {
+            self.remoteVideoView.alpha = 0
             self.callEndedLabel.alpha = 1
         }
         Timer.scheduledTimer(withTimeInterval: 2, repeats: false) { _ in

SessionMessagingKit/Calls/WebRTCSession.swift

@@ -194,6 +194,7 @@ public final class WebRTCSession : NSObject, RTCPeerConnectionDelegate {
         guard let thread = TSContactThread.fetch(for: sessionID, using: transaction) else { return }
         let message = CallMessage()
         message.kind = .endCall
+        print("[Calls] Sending end call message.")
         MessageSender.sendNonDurably(message, in: thread, using: transaction).retainUntilComplete()
         dropConnection()
         WebRTCSession.current = nil

SessionMessagingKit/Messages/Control Messages/CallMessage.swift

@@ -40,7 +40,6 @@ public final class CallMessage : ControlMessage {
     // MARK: Validation
     public override var isValid: Bool {
         guard super.isValid else { return false }
-        guard let sdps = sdps, !sdps.isEmpty else { return false }
         return kind != nil
     }
     
@@ -97,7 +96,7 @@ public final class CallMessage : ControlMessage {
     }
 
     public override func toProto(using transaction: YapDatabaseReadWriteTransaction) -> SNProtoContent? {
-        guard let kind = kind, let sdps = sdps, !sdps.isEmpty else {
+        guard let kind = kind else {
             SNLog("Couldn't construct call message proto from: \(self).")
             return nil
         }
@@ -110,7 +109,9 @@ public final class CallMessage : ControlMessage {
         case .endCall: type = .endCall
         }
         let callMessageProto = SNProtoCallMessage.builder(type: type)
+        if let sdps = sdps, !sdps.isEmpty {
             callMessageProto.setSdps(sdps)
+        }
         if case let .iceCandidates(sdpMLineIndexes, sdpMids) = kind {
             callMessageProto.setSdpMlineIndexes(sdpMLineIndexes)
             callMessageProto.setSdpMids(sdpMids)

SessionMessagingKit/Sending & Receiving/MessageReceiver+Handling.swift

@@ -289,7 +289,9 @@ extension MessageReceiver {
                 candidates.append(candidate)
             }
             getWebRTCSession().handleICECandidates(candidates)
-        case .endCall: handleEndCallMessage?(message)
+        case .endCall:
+            print("[Calls] Received end call message.")
+            handleEndCallMessage?(message)
         }
     }