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diff --git a/media/libstagefright/codecs/aacenc/inc/block_switch.h b/media/libstagefright/codecs/aacenc/inc/block_switch.h
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+++ b/media/libstagefright/codecs/aacenc/inc/block_switch.h
@@ -0,0 +1,72 @@
+/*
+ ** Copyright 2003-2010, VisualOn, Inc.
+ **
+ ** Licensed under the Apache License, Version 2.0 (the "License");
+ ** you may not use this file except in compliance with the License.
+ ** You may obtain a copy of the License at
+ **
+ **     http://www.apache.org/licenses/LICENSE-2.0
+ **
+ ** Unless required by applicable law or agreed to in writing, software
+ ** distributed under the License is distributed on an "AS IS" BASIS,
+ ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ ** See the License for the specific language governing permissions and
+ ** limitations under the License.
+ */
+/*******************************************************************************
+	File:		block_switch.h
+
+	Content:	Block switching structure and functions
+
+*******************************************************************************/
+
+#ifndef _BLOCK_SWITCH_H
+#define _BLOCK_SWITCH_H
+
+#include "typedef.h"
+
+
+/****************** Defines ******************************/
+#define BLOCK_SWITCHING_IIR_LEN 2                                           /* Length of HighPass-FIR-Filter for Attack-Detection */
+#define BLOCK_SWITCH_WINDOWS TRANS_FAC                                      /* number of windows for energy calculation */
+#define BLOCK_SWITCH_WINDOW_LEN FRAME_LEN_SHORT                             /* minimal granularity of energy calculation */
+
+
+
+/****************** Structures ***************************/
+typedef struct{
+  Word32 invAttackRatio;
+  Word16 windowSequence;
+  Word16 nextwindowSequence;
+  Flag attack;
+  Flag lastattack;
+  Word16 attackIndex;
+  Word16 lastAttackIndex;
+  Word16 noOfGroups;
+  Word16 groupLen[TRANS_FAC];
+  Word32 windowNrg[2][BLOCK_SWITCH_WINDOWS];     /* time signal energy in Subwindows (last and current) */
+  Word32 windowNrgF[2][BLOCK_SWITCH_WINDOWS];    /* filtered time signal energy in segments (last and current) */
+  Word32 iirStates[BLOCK_SWITCHING_IIR_LEN];     /* filter delay-line */
+  Word32 maxWindowNrg;                           /* max energy in subwindows */
+  Word32 accWindowNrg;                           /* recursively accumulated windowNrgF */
+}BLOCK_SWITCHING_CONTROL;
+
+
+
+
+
+Word16 InitBlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControl,
+                          const Word32 bitRate, const Word16 nChannels);
+
+Word16 BlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControl,
+                      Word16 *timeSignal,
+					  Word32  sampleRate,
+                      Word16 chIncrement);
+
+Word16 SyncBlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControlLeft,
+                          BLOCK_SWITCHING_CONTROL *blockSwitchingControlRight,
+                          const Word16 noOfChannels);
+
+
+
+#endif  /* #ifndef _BLOCK_SWITCH_H */