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diff --git a/libAACdec/src/conceal.h b/libAACdec/src/conceal.h
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+/*****************************  MPEG-4 AAC Decoder  **************************
+
+                        (C) Copyright Fraunhofer IIS (2004)
+                               All Rights Reserved
+
+    Please be advised that this software and/or program delivery is
+    Confidential Information of Fraunhofer and subject to and covered by the
+
+    Fraunhofer IIS Software Evaluation Agreement
+    between Google Inc. and  Fraunhofer
+    effective and in full force since March 1, 2012.
+
+    You may use this software and/or program only under the terms and
+    conditions described in the above mentioned Fraunhofer IIS Software
+    Evaluation Agreement. Any other and/or further use requires a separate agreement.
+
+
+   $Id$
+   Author(s):   Josef Hoepfl
+   Description: independent channel concealment
+
+   This software and/or program is protected by copyright law and international
+   treaties. Any reproduction or distribution of this software and/or program,
+   or any portion of it, may result in severe civil and criminal penalties, and
+   will be prosecuted to the maximum extent possible under law.
+
+******************************************************************************/
+
+#ifndef _CONCEAL_H_
+#define _CONCEAL_H_
+
+#include "aacdecoder_lib.h"
+
+#include "channelinfo.h"
+
+#define AACDEC_CONCEAL_PARAM_NOT_SPECIFIED ( 0xFFFE )
+
+void CConcealment_InitCommonData  (CConcealParams   *pConcealCommonData);
+
+void CConcealment_InitChannelData (CConcealmentInfo *hConcealmentInfo,
+                                   CConcealParams   *pConcealCommonData,
+                                   int  samplesPerFrame);
+
+CConcealmentMethod
+     CConcealment_GetMethod       (CConcealParams *pConcealCommonData);
+
+UINT
+  CConcealment_GetDelay           (CConcealParams *pConcealCommonData);
+
+AAC_DECODER_ERROR
+     CConcealment_SetParams       (CConcealParams *concealParams,
+                                   int  method,
+                                   int  fadeOutSlope,
+                                   int  fadeInSlope,
+                                   int  muteRelease,
+                                   int  comfNoiseLevel);
+
+CConcealmentState
+     CConcealment_GetState        (CConcealmentInfo *hConcealmentInfo);
+
+AAC_DECODER_ERROR
+     CConcealment_SetAttenuation  (CConcealParams *concealParams,
+                                   SHORT *fadeOutAttenuationVector,
+                                   SHORT *fadeInAttenuationVector);
+
+void CConcealment_Store           (CConcealmentInfo *hConcealmentInfo,
+                                   CAacDecoderChannelInfo *pAacDecoderChannelInfo,
+                                   CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo );
+
+int  CConcealment_Apply           (CConcealmentInfo *hConcealmentInfo,
+                                   CAacDecoderChannelInfo *pAacDecoderChannelInfo,
+                                   CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo,
+                                   const SamplingRateInfo *pSamplingRateInfo,
+                                   const int samplesPerFrame,
+                                   const UCHAR lastLpdMode,
+                                   const int FrameOk,
+                                   const UINT flags);
+
+FIXP_DBL
+     CConcealment_GetFadeFactor   (CConcealmentInfo *hConcealmentInfo,
+                                   const int fPreviousFactor);
+
+int  CConcealment_GetLastFrameOk  (CConcealmentInfo *hConcealmentInfo,
+                                   const int fBeforeApply);
+
+#endif /* #ifndef _CONCEAL_H_ */