Unhide the android.media.[Media]DataSource interface.

This allows apps to implement MediaDataSource, which is modeled on
stagefright's DataSource, to supply media data to the framework. This
was already implemented for MediaExtractor, but it was renamed from
DataSource.

MediaExtractor, MediaPlayer and MediaMetadataRetriever each have a new
overload: #setDataSource(android.media.MediaDataSource)

Only NuPlayer supports this new data source.

The change introduces:
 * IDataSource:        The binder interface for DataSource.
 * JMediaDataSource:   The native counterpart to the java interface. It
                       implements IDataSource.
 * CallbackDataSource: A stagefright DataSource that wraps an
                       IDataSource.

Change-Id: Ib3c944b49cc8a792c8eb9c85e5015c07f298ebc1
diff --git a/media/libmediaplayerservice/MediaPlayerFactory.cpp b/media/libmediaplayerservice/MediaPlayerFactory.cpp
index 48884b9..ca33aed 100644
--- a/media/libmediaplayerservice/MediaPlayerFactory.cpp
+++ b/media/libmediaplayerservice/MediaPlayerFactory.cpp
@@ -131,6 +131,11 @@
     GET_PLAYER_TYPE_IMPL(client, source);
 }
 
+player_type MediaPlayerFactory::getPlayerType(const sp<IMediaPlayer>& client,
+                                              const sp<DataSource> &source) {
+    GET_PLAYER_TYPE_IMPL(client, source);
+}
+
 #undef GET_PLAYER_TYPE_IMPL
 
 sp<MediaPlayerBase> MediaPlayerFactory::createPlayer(
@@ -273,6 +278,13 @@
         return 1.0;
     }
 
+    virtual float scoreFactory(const sp<IMediaPlayer>& /*client*/,
+                               const sp<DataSource>& /*source*/,
+                               float /*curScore*/) {
+        // Only NuPlayer supports setting a DataSource source directly.
+        return 1.0;
+    }
+
     virtual sp<MediaPlayerBase> createPlayer() {
         ALOGV(" create NuPlayer");
         return new NuPlayerDriver;