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diff --git a/libSBRdec/src/sbrdec_drc.h b/libSBRdec/src/sbrdec_drc.h
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+++ b/libSBRdec/src/sbrdec_drc.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):   Christian Griebel
+   Description: Dynamic range control (DRC) decoder tool for SBR
+
+   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 _SBRDEC_DRC_H_
+#define _SBRDEC_DRC_H_
+
+#include "sbrdecoder.h"
+
+
+#define SBRDEC_MAX_DRC_CHANNELS  (6)
+#define SBRDEC_MAX_DRC_BANDS     ( 16 )
+
+typedef struct
+{
+  FIXP_DBL prevFact_mag[(64)];
+  INT      prevFact_exp;
+
+  FIXP_DBL currFact_mag[SBRDEC_MAX_DRC_BANDS];
+  FIXP_DBL nextFact_mag[SBRDEC_MAX_DRC_BANDS];
+  INT      currFact_exp;
+  INT      nextFact_exp;
+
+  UINT     numBandsCurr;
+  UINT     numBandsNext;
+  USHORT   bandTopCurr[SBRDEC_MAX_DRC_BANDS];
+  USHORT   bandTopNext[SBRDEC_MAX_DRC_BANDS];
+
+  SHORT    drcInterpolationSchemeCurr;
+  SHORT    drcInterpolationSchemeNext;
+
+  SHORT    enable;
+
+  UCHAR    winSequenceCurr;
+  UCHAR    winSequenceNext;
+
+} SBRDEC_DRC_CHANNEL;
+
+typedef SBRDEC_DRC_CHANNEL * HANDLE_SBR_DRC_CHANNEL;
+
+
+void sbrDecoder_drcInitChannel (
+    HANDLE_SBR_DRC_CHANNEL  hDrcData );
+
+void sbrDecoder_drcUpdateChannel (
+    HANDLE_SBR_DRC_CHANNEL  hDrcData );
+
+void sbrDecoder_drcApplySlot (
+    HANDLE_SBR_DRC_CHANNEL  hDrcData,
+    FIXP_DBL *qmfRealSlot,
+    FIXP_DBL *qmfImagSlot,
+    int  col,
+    int  numQmfSubSamples,
+    int  maxShift );
+
+void sbrDecoder_drcApply (
+    HANDLE_SBR_DRC_CHANNEL  hDrcData,
+    FIXP_DBL **QmfBufferReal,
+    FIXP_DBL **QmfBufferImag,
+    int  numQmfSubSamples,
+    int *scaleFactor );
+
+
+#endif  /* _SBRDEC_DRC_H_ */