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diff --git a/libAACenc/src/sf_estim.h b/libAACenc/src/sf_estim.h
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+/******************************** MPEG Audio Encoder **************************
+
+                     (C) Copyright Fraunhofer IIS (1999)
+                               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. Werner
+   contents/description: Scale factor estimation
+
+******************************************************************************/
+#ifndef _SF_ESTIM_H
+#define _SF_ESTIM_H
+
+#include "common_fix.h"
+
+
+#include "psy_const.h"
+#include "qc_data.h"
+#include "interface.h"
+
+#define FORM_FAC_SHIFT  6
+
+
+void
+FDKaacEnc_CalcFormFactor(QC_OUT_CHANNEL   *qcOutChannel[(2)],
+               PSY_OUT_CHANNEL  *psyOutChannel[(2)],
+               const INT        nChannels);
+
+void
+FDKaacEnc_EstimateScaleFactors(PSY_OUT_CHANNEL *psyOutChannel[],
+                     QC_OUT_CHANNEL* qcOutChannel[],
+                     const int invQuant,
+                     const int nChannels);
+
+
+
+#endif