Add mbtk_loopbuff and rtp support.

Change-Id: Idc80af4efb8ff76c4afc59fdf1d3896b453e6ff4
diff --git a/mbtk/libmbtk_lib/audio/mbtk_audio_internal.h b/mbtk/libmbtk_lib/audio/mbtk_audio_internal.h
index b4b3dc2..0f020b7 100755
--- a/mbtk/libmbtk_lib/audio/mbtk_audio_internal.h
+++ b/mbtk/libmbtk_lib/audio/mbtk_audio_internal.h
@@ -46,10 +46,9 @@
     audio_hw_device_t *audio_ahw_dev_ubus;
 
     mbtk_audio_direction_enum direction;
-    union {
-        audio_play_info_t play;
-        audio_recorder_info_t recorder;
-    }info;
+
+    audio_play_info_t play;
+    audio_recorder_info_t recorder;
 } audio_inter_info_t;
 
 #endif /* _MBTK_AUDIO_INTERNAL_H */