Add method to get source/sink type.

Also provide convenience method to enumerate all sinks connected to a source.

java/src/edu/wpi/cscore/VideoSink.java

@@ -11,6 +11,20 @@ package edu.wpi.cscore;
 /// consist of multiple images (e.g. from a stereo or depth camera); these
 /// are called channels.
 public class VideoSink {
+  public enum Type {
+    kUnknown(0), kMJPEG(2), kCv(4);
+    private int value;
+
+    private Type(int value) {
+      this.value = value;
+    }
+
+    public int getValue() {
+      return value;
+    }
+  }
+  static final Type[] m_typeValues = Type.values();
+
   protected VideoSink(int handle) {
     m_handle = handle;
   }
@@ -42,6 +56,11 @@ public class VideoSink {
     return m_handle;
   }
 
+  /// Get the type of the sink.
+  public Type getType() {
+    return m_typeValues[CameraServerJNI.getSinkType(m_handle)];
+  }
+
   /// Get the name of the sink.  The name is an arbitrary identifier
   /// provided when the sink is created, and should be unique.
   public String getName() {