Support for UDP data source

library/core/src/main/java/com/google/android/exoplayer2/upstream/DefaultDataSource.java

@@ -55,6 +55,7 @@ public final class DefaultDataSource implements DataSource {
   private static final String SCHEME_ASSET = "asset";
   private static final String SCHEME_CONTENT = "content";
   private static final String SCHEME_RTMP = "rtmp";
+  private static final String SCHEME_UDP = "udp";
   private static final String SCHEME_RAW = RawResourceDataSource.RAW_RESOURCE_SCHEME;
 
   private final Context context;
@@ -66,6 +67,7 @@ public final class DefaultDataSource implements DataSource {
   @Nullable private DataSource assetDataSource;
   @Nullable private DataSource contentDataSource;
   @Nullable private DataSource rtmpDataSource;
+  @Nullable private DataSource udpDataSource;
   @Nullable private DataSource dataSchemeDataSource;
   @Nullable private DataSource rawResourceDataSource;
 
@@ -139,6 +141,7 @@ public final class DefaultDataSource implements DataSource {
     maybeAddListenerToDataSource(assetDataSource, transferListener);
     maybeAddListenerToDataSource(contentDataSource, transferListener);
     maybeAddListenerToDataSource(rtmpDataSource, transferListener);
+    maybeAddListenerToDataSource(udpDataSource, transferListener);
     maybeAddListenerToDataSource(dataSchemeDataSource, transferListener);
     maybeAddListenerToDataSource(rawResourceDataSource, transferListener);
   }
@@ -161,6 +164,8 @@ public final class DefaultDataSource implements DataSource {
       dataSource = getContentDataSource();
     } else if (SCHEME_RTMP.equals(scheme)) {
       dataSource = getRtmpDataSource();
+    } else if(SCHEME_UDP.equals(scheme)){
+      dataSource = getUdpDataSource();
     } else if (DataSchemeDataSource.SCHEME_DATA.equals(scheme)) {
       dataSource = getDataSchemeDataSource();
     } else if (SCHEME_RAW.equals(scheme)) {
@@ -199,6 +204,14 @@ public final class DefaultDataSource implements DataSource {
     }
   }
 
+  private DataSource getUdpDataSource(){
+    if (udpDataSource == null) {
+      udpDataSource = new UdpDataSource();
+      addListenersToDataSource(udpDataSource);
+    }
+    return udpDataSource;
+  }
+
   private DataSource getFileDataSource() {
     if (fileDataSource == null) {
       fileDataSource = new FileDataSource();