hawkeye camera support(not tested)

framework/Inspectron.HawkEye/RTSP/Sdp/ConnectionIP4.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Globalization;
+
+namespace Inspectron.HawkEye.RTSP.Sdp
+{
+    public class ConnectionIP4 : Connection
+    {
+
+        public int Ttl { get; set; }
+
+        internal new static ConnectionIP4 Parse(string ipAddress)
+        {
+            string[] parts = ipAddress.Split('/');
+
+            if (parts.Length > 3)
+                throw new FormatException("Too much address subpart in " + ipAddress);
+
+            ConnectionIP4 result = new ConnectionIP4();
+
+            result.Host = parts[0];
+
+            int ttl;
+            if (parts.Length > 1)
+            {
+                if (!int.TryParse(parts[1], NumberStyles.Integer, CultureInfo.InvariantCulture, out ttl))
+                    throw new FormatException("Invalid TTL format : " + parts[1]);
+                result.Ttl = ttl;
+            }
+            int numberOfAddress;
+            if (parts.Length > 2)
+            {
+                if (!int.TryParse(parts[2], NumberStyles.Integer, CultureInfo.InvariantCulture, out numberOfAddress))
+                    throw new FormatException("Invalid number of address : " + parts[2]);
+                result.NumberOfAddress = numberOfAddress;
+            }
+
+            return result;
+        }
+    }
+}