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diff --git a/media/libstagefright/codecs/aacenc/inc/bitbuffer.h b/media/libstagefright/codecs/aacenc/inc/bitbuffer.h
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+++ b/media/libstagefright/codecs/aacenc/inc/bitbuffer.h
@@ -0,0 +1,89 @@
+/*
+ ** 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:		bitbuffer.h
+
+	Content:	Bit Buffer Management structure and functions
+
+*******************************************************************************/
+
+#ifndef BITBUFFER_H
+#define BITBUFFER_H
+
+#include "typedef.h"
+
+
+enum direction
+{
+  forwardDirection,
+  backwardDirection
+};
+
+
+/*!
+   The pointer 'pReadNext' points to the next available word, where bits can be read from. The pointer
+   'pWriteNext' points to the next available word, where bits can be written to. The pointer pBitBufBase
+   points to the start of the bitstream buffer and the pointer pBitBufEnd points to the end of the bitstream
+   buffer. The two pointers are used as lower-bound respectively upper-bound address for the modulo addressing
+   mode.
+
+   The element cntBits contains the currently available bits in the bit buffer. It will be incremented when
+   bits are written to the bitstream buffer and decremented when bits are read from the bitstream buffer.
+*/
+struct BIT_BUF
+{
+  UWord8 *pBitBufBase;          /*!< pointer points to first position in bitstream buffer */
+  UWord8 *pBitBufEnd;           /*!< pointer points to last position in bitstream buffer */
+
+  UWord8 *pWriteNext;           /*!< pointer points to next available word in bitstream buffer to write */
+
+  UWord32 cache;
+
+  Word16  wBitPos;              /*!< 31<=wBitPos<=0*/
+  Word16  cntBits;              /*!< number of available bits in the bitstream buffer
+                                     write bits to bitstream buffer  => increment cntBits
+                                     read bits from bitstream buffer => decrement cntBits */
+  Word16  size;                 /*!< size of bitbuffer in bits */
+  Word16  isValid;              /*!< indicates whether the instance has been initialized */
+}; /* size Word16: 8 */
+
+/*! Define pointer to bit buffer structure */
+typedef struct BIT_BUF *HANDLE_BIT_BUF;
+
+
+HANDLE_BIT_BUF CreateBitBuffer(HANDLE_BIT_BUF hBitBuf,
+                               UWord8 *pBitBufBase,
+                               Word16  bitBufSize);
+
+
+void DeleteBitBuffer(HANDLE_BIT_BUF *hBitBuf);
+
+
+Word16 GetBitsAvail(HANDLE_BIT_BUF hBitBuf);
+
+
+Word16 WriteBits(HANDLE_BIT_BUF hBitBuf,
+                 Word32 writeValue,
+                 Word16 noBitsToWrite);
+
+void ResetBitBuf(HANDLE_BIT_BUF hBitBuf,
+                 UWord8 *pBitBufBase,
+                 Word16  bitBufSize);
+
+#define GetNrBitsAvailable(hBitBuf) ( (hBitBuf)->cntBits)
+#define GetNrBitsRead(hBitBuf)       ((hBitBuf)->size-(hBitBuf)->cntBits)
+
+#endif /* BITBUFFER_H */