Add MediaPlayer::getAudioStreamType.

Change-Id: I9cd8a718d2873543609aa651fd85749478f4f89f
diff --git a/include/media/mediaplayer.h b/include/media/mediaplayer.h
index f8e4e3b..3ca3095 100644
--- a/include/media/mediaplayer.h
+++ b/include/media/mediaplayer.h
@@ -223,6 +223,7 @@
             status_t        getDuration(int *msec);
             status_t        reset();
             status_t        setAudioStreamType(audio_stream_type_t type);
+            status_t        getAudioStreamType(audio_stream_type_t *type);
             status_t        setLooping(int loop);
             bool            isLooping();
             status_t        setVolume(float leftVolume, float rightVolume);