diff --git a/include/media/mediametadataretriever.h b/include/media/mediametadataretriever.h
index 3e343e0..28f305d 100644
--- a/include/media/mediametadataretriever.h
+++ b/include/media/mediametadataretriever.h
@@ -52,6 +52,7 @@
     METADATA_KEY_VIDEO_WIDTH     = 18,
     METADATA_KEY_VIDEO_HEIGHT    = 19,
     METADATA_KEY_BITRATE         = 20,
+    METADATA_KEY_TIMED_TEXT_LANGUAGES      = 21,
 
     // Add more here...
 };
diff --git a/include/media/mediaplayer.h b/include/media/mediaplayer.h
index 241626c..cfa4cfd 100644
--- a/include/media/mediaplayer.h
+++ b/include/media/mediaplayer.h
@@ -125,6 +125,9 @@
     MEDIA_PLAYER_PLAYBACK_COMPLETE  = 1 << 7
 };
 
+enum media_set_parameter_keys {
+    KEY_PARAMETER_TIMED_TEXT_TRACK_INDEX = 1000,
+};
 // ----------------------------------------------------------------------------
 // ref-counted object for callbacks
 class MediaPlayerListener: virtual public RefBase
diff --git a/include/media/stagefright/MediaDefs.h b/include/media/stagefright/MediaDefs.h
index 6a21627..5e471c1 100644
--- a/include/media/stagefright/MediaDefs.h
+++ b/include/media/stagefright/MediaDefs.h
@@ -49,6 +49,8 @@
 
 extern const char *MEDIA_MIMETYPE_CONTAINER_WVM;
 
+extern const char *MEDIA_MIMETYPE_TEXT_3GPP;
+
 }  // namespace android
 
 #endif  // MEDIA_DEFS_H_
diff --git a/include/media/stagefright/MetaData.h b/include/media/stagefright/MetaData.h
index f7f2235..4044c5d 100644
--- a/include/media/stagefright/MetaData.h
+++ b/include/media/stagefright/MetaData.h
@@ -114,6 +114,9 @@
 
     // An indication that a video buffer has been rendered.
     kKeyRendered          = 'rend',  // bool (int32_t)
+
+    // The language code for this media
+    kKeyMediaLanguage     = 'lang',  // cstring
 };
 
 enum {