Allow sdpMLineIndex to be null when addCandidate.

`

Author: cloudwebrtc

android/src/main/java/com/cloudwebrtc/webrtc/MethodCallHandlerImpl.java

@@ -1523,11 +1523,14 @@ public void peerConnectionAddICECandidate(ConstraintsMap candidateMap, final Str
     boolean res = false;
     PeerConnection peerConnection = getPeerConnection(id);
     if (peerConnection != null) {
+      int sdpMLineIndex = 0;
+      if (!candidateMap.isNull("sdpMLineIndex")) {
+        sdpMLineIndex = candidateMap.getInt("sdpMLineIndex");
+      }
       IceCandidate candidate = new IceCandidate(
-              candidateMap.getString("sdpMid"),
-              candidateMap.getInt("sdpMLineIndex"),
-              candidateMap.getString("candidate")
-      );
+          candidateMap.getString("sdpMid"),
+          sdpMLineIndex,
+          candidateMap.getString("candidate"));
       res = peerConnection.addIceCandidate(candidate);
     } else {
       resultError("peerConnectionAddICECandidate", "peerConnection is null", result);

common/cpp/src/flutter_webrtc.cc

@@ -261,10 +261,11 @@ void FlutterWebRTC::HandleMethodCall(
     }
 
     SdpParseError error;
+    int sdpMLineIndex = findInt(constraints, "sdpMLineIndex");
     scoped_refptr<RTCIceCandidate> rtc_candidate =
         RTCIceCandidate::Create(findString(constraints, "candidate").c_str(),
                                 findString(constraints, "sdpMid").c_str(),
-                                findInt(constraints, "sdpMLineIndex"), &error);
+                                sdpMLineIndex == -1 ? 0 : sdpMLineIndex, &error);
 
     AddIceCandidate(rtc_candidate.get(), pc, std::move(result));
   } else if (method_call.method_name().compare("getStats") == 0) {