diff --git a/include/media/MediaPlayerInterface.h b/include/media/MediaPlayerInterface.h
index d1933f6..9102b40 100644
--- a/include/media/MediaPlayerInterface.h
+++ b/include/media/MediaPlayerInterface.h
@@ -19,8 +19,10 @@
 
 #ifdef __cplusplus
 
+#include <sys/types.h>
 #include <ui/ISurface.h>
 #include <utils/RefBase.h>
+#include <utils/Errors.h>
 
 #include <media/mediaplayer.h>
 #include <media/AudioSystem.h>
@@ -33,7 +35,11 @@
     PV_PLAYER = 1,
     SONIVOX_PLAYER = 2,
     VORBIS_PLAYER = 3,
-    STAGEFRIGHT_PLAYER = 4
+    STAGEFRIGHT_PLAYER = 4,
+    // Test players are available only in the 'test' and 'eng' builds.
+    // The shared library with the test player is passed passed as an
+    // argument to the 'test:' url in the setDataSource call.
+    TEST_PLAYER = 5,
 };