Can toggle local streams

lib/ui/screens/call_screen.dart

@@ -47,9 +47,18 @@ class _CallScreenState extends SafeState<CallScreen> {
   final _renderers = Map<int, RTCVideoRenderer>();
   MediaStream _localStream;
 
+  bool get isStreamingAudio =>
+      _localStream != null && _localStream.getAudioTracks().length > 0;
+
   bool get isStreamingVideo =>
       _localStream != null && _localStream.getVideoTracks().length > 0;
 
+  bool get isAudioMuted =>
+      isStreamingAudio && !_localStream.getAudioTracks()[0].enabled;
+
+  bool get isVideoMuted =>
+      isStreamingVideo && !_localStream.getVideoTracks()[0].enabled;
+
   @override
   void initState() {
     super.initState();
@@ -67,7 +76,8 @@ class _CallScreenState extends SafeState<CallScreen> {
       setState(() => _error = false);
 
       // First, load information about the conversation
-      _conversation = await ConversationsHelper().getSingleOrThrow(convID);
+      _conversation =
+          await ConversationsHelper().getSingleOrThrow(convID, force: true);
       _convName =
           await ConversationsHelper.getConversationNameAsync(_conversation);
       assert(_convName != null);
@@ -205,6 +215,31 @@ class _CallScreenState extends SafeState<CallScreen> {
     }
   }
 
+  /// Toggle local video streaming
+  Future<void> _toggleStreaming(bool isVideo) async {
+    if (isVideo && _conversation.callCapabilities != CallCapabilities.VIDEO) {
+      print("Attempting to switch video call on a non-capable video stream!");
+      return;
+    }
+
+    // Start streaming if required
+    if (!isStreamingAudio || (!isStreamingVideo && isVideo)) {
+      await _startStreaming(isVideo);
+    }
+
+    // Toggle appropriate mute
+    else {
+      if (!isVideo)
+        _localStream.getAudioTracks()[0].enabled =
+            !_localStream.getAudioTracks()[0].enabled;
+      else
+        _localStream.getVideoTracks()[0].enabled =
+            !_localStream.getVideoTracks()[0].enabled;
+    }
+
+    setState(() {});
+  }
+
   /// Call this when a user started to stream media
   Future<void> _memberReady(int memberID) async {
     try {
@@ -400,8 +435,10 @@ class _CallScreenState extends SafeState<CallScreen> {
           // Toggle audio button
           Expanded(
             child: IconButton(
-              icon: Icon(Icons.mic_off),
+              icon: Icon(isStreamingAudio && !isAudioMuted
-              onPressed: () => _startStreaming(false),
+                  ? Icons.mic
+                  : Icons.mic_off),
+              onPressed: () => _toggleStreaming(false),
             ),
           ),
 
@@ -416,8 +453,10 @@ class _CallScreenState extends SafeState<CallScreen> {
           // Toggle video button
           Expanded(
             child: IconButton(
-              icon: Icon(Icons.videocam_off),
+              icon: Icon(isStreamingVideo && !isVideoMuted
-              onPressed: () => _startStreaming(true),
+                  ? Icons.videocam
+                  : Icons.videocam_off),
+              onPressed: () => _toggleStreaming(true),
             ),
           ),
         ],