deal with audio I/O change

Session/Calls/Call Management/SessionCall.swift

@@ -10,6 +10,7 @@ public final class SessionCall: NSObject, WebRTCSessionDelegate {
     let callID: UUID // This is for CallKit
     let sessionID: String
     let mode: Mode
+    var audioMode: AudioMode
     let webRTCSession: WebRTCSession
     let isOutgoing: Bool
     var remoteSDP: RTCSessionDescription? = nil
@@ -70,6 +71,14 @@ public final class SessionCall: NSObject, WebRTCSessionDelegate {
         case unanswered
     }
     
+    // MARK: Audio I/O mode
+    enum AudioMode {
+        case earpiece
+        case speaker
+        case headphone
+        case bluetooth
+    }
+    
     // MARK: Call State Properties
     var connectingDate: Date? {
         didSet {
@@ -141,6 +150,7 @@ public final class SessionCall: NSObject, WebRTCSessionDelegate {
         self.uuid = uuid
         self.callID = UUID()
         self.mode = mode
+        self.audioMode = .earpiece
         self.webRTCSession = WebRTCSession.current ?? WebRTCSession(for: sessionID, with: uuid)
         self.isOutgoing = outgoing
         WebRTCSession.current = self.webRTCSession
@@ -258,6 +268,16 @@ public final class SessionCall: NSObject, WebRTCSessionDelegate {
         webRTCSession.attachLocalRenderer(renderer)
     }
     
+    // MARK: Audio I/O swithcing
+    func switchAudioMode(mode: AudioMode) {
+        audioMode = mode
+        if mode == .speaker {
+            webRTCSession.configureAudioSession(outputAudioPort: .speaker)
+        } else {
+            webRTCSession.configureAudioSession()
+        }
+    }
+    
     // MARK: Delegate
     public func webRTCIsConnected() {
         guard !self.hasConnected else { return }

Session/Calls/CallVC.swift

@@ -3,6 +3,7 @@ import SessionUIKit
 import SessionMessagingKit
 import SessionUtilitiesKit
 import UIKit
+import MediaPlayer
 
 final class CallVC : UIViewController, VideoPreviewDelegate {
     let call: SessionCall
@@ -127,8 +128,21 @@ final class CallVC : UIViewController, VideoPreviewDelegate {
         return result
     }()
     
+    private lazy var volumeView: MPVolumeView = {
+        let result = MPVolumeView()
+        let image = UIImage(named: "Speaker")?.withRenderingMode(.alwaysTemplate)
+        result.showsRouteButton = true
+        result.setRouteButtonImage(image, for: UIControl.State.normal)
+        result.set(.width, to: 60)
+        result.set(.height, to: 60)
+        result.tintColor = .white
+        result.backgroundColor = UIColor(hex: 0x1F1F1F)
+        result.layer.cornerRadius = 30
+        return result
+    }()
+    
     private lazy var operationPanel: UIStackView = {
-        let result = UIStackView(arrangedSubviews: [switchCameraButton, videoButton, switchAudioButton])
+        let result = UIStackView(arrangedSubviews: [switchCameraButton, videoButton, switchAudioButton, volumeView])
         result.axis = .horizontal
         result.spacing = Values.veryLargeSpacing
         return result

Session/Meta/Images.xcassets/Session/Speaker.imageset/Contents.json

@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "filename" : "speaker.pdf",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

SessionMessagingKit/Calls/WebRTCSession.swift

@@ -261,7 +261,6 @@ public final class WebRTCSession : NSObject, RTCPeerConnectionDelegate {
         print("[Calls] ICE connection state changed to: \(state).")
         if state == .connected {
             delegate?.webRTCIsConnected()
-            configureAudioSession()
         }
     }
     
@@ -283,13 +282,13 @@ public final class WebRTCSession : NSObject, RTCPeerConnectionDelegate {
 }
 
 extension WebRTCSession {
-    private func configureAudioSession() {
+    public func configureAudioSession(outputAudioPort: AVAudioSession.PortOverride = .none) {
         let audioSession = RTCAudioSession.sharedInstance()
         audioSession.lockForConfiguration()
         do {
             try audioSession.setCategory(AVAudioSession.Category.playAndRecord.rawValue)
             try audioSession.setMode(AVAudioSession.Mode.voiceChat.rawValue)
-            try audioSession.overrideOutputAudioPort(.speaker)
+            try audioSession.overrideOutputAudioPort(outputAudioPort)
             try audioSession.setActive(true)
         } catch let error {
             SNLog("Couldn't set up WebRTC audio session due to error: \(error)")