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diff --git a/libAACenc/src/pns_func.h b/libAACenc/src/pns_func.h
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+/******************************** MPEG Audio Encoder **************************
+
+                     (C) Copyright Fraunhofer IIS (2001)
+                               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.
+
+
+   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.
+
+   $Id$
+
+   Initial author:       M. Lohwasser
+   contents/description: pns_func.h
+
+******************************************************************************/
+
+#ifndef _PNS_FUNC_H
+#define _PNS_FUNC_H
+
+#include "common_fix.h"
+
+#include "aacenc_pns.h"
+#include "psy_data.h"
+
+
+
+AAC_ENCODER_ERROR FDKaacEnc_InitPnsConfiguration(PNS_CONFIG *pnsConf,
+                                                 INT        bitRate,
+                                                 INT        sampleRate,
+                                                 INT        usePns,
+                                                 INT        sfbCnt,
+                                                 const INT  *sfbOffset,
+                                                 const INT  numChan,
+                                                 const INT  isLC );
+
+void FDKaacEnc_PnsDetect( PNS_CONFIG  *pnsConf,
+                PNS_DATA    *pnsData,
+                const INT   lastWindowSequence,
+                const INT   sfbActive,
+                const INT   maxSfbPerGroup,
+                FIXP_DBL    *sfbThresholdLdData,
+                const INT   *sfbOffset,
+                FIXP_DBL    *mdctSpectrum,
+                INT         *sfbMaxScaleSpec,
+                FIXP_SGL    *sfbtonality,
+                int         tnsOrder,
+                INT         tnsPredictionGain,
+                INT         tnsActive,
+                FIXP_DBL    *sfbEnergyLdData,
+                INT         *noiseNrg );
+
+void FDKaacEnc_CodePnsChannel( const INT     sfbActive,
+                     PNS_CONFIG    *pnsConf,
+                     INT           *pnsFlag,
+                     FIXP_DBL      *sfbEnergy,
+                     INT           *noiseNrg,
+                     FIXP_DBL      *sfbThreshold );
+
+void FDKaacEnc_PreProcessPnsChannelPair( const INT  sfbActive,
+                               FIXP_DBL   *sfbEnergyLeft,
+                               FIXP_DBL   *sfbEnergyRight,
+                               FIXP_DBL   *sfbEnergyLeftLD,
+                               FIXP_DBL   *sfbEnergyRightLD,
+                               FIXP_DBL   *sfbEnergyMid,
+                               PNS_CONFIG *pnsConfLeft,
+                               PNS_DATA   *pnsDataLeft,
+                               PNS_DATA   *pnsDataRight );
+
+void FDKaacEnc_PostProcessPnsChannelPair( const INT   sfbActive,
+                                PNS_CONFIG  *pnsConf,
+                                PNS_DATA    *pnsDataLeft,
+                                PNS_DATA    *pnsDataRight,
+                                INT         *msMask,
+                                INT         *msDigest );
+
+#endif /* _PNS_FUNC_H */