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diff --git a/libAACdec/src/aacdec_drc.h b/libAACdec/src/aacdec_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 AAC
+
+   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 AACDEC_DRC_H
+#define AACDEC_DRC_H
+
+#include "tp_data.h"            /* for program config element support */
+
+
+#include "aacdec_drc_types.h"
+#include "channel.h"
+#include "FDK_bitstream.h"
+
+#define AACDEC_DRC_DEFAULT_REF_LEVEL  ( 108 )   /* -27 dB below full scale (typical for movies) */
+#define AACDEC_DRC_DFLT_EXPIRY_FRAMES (  40 )   /* Default DRC data expiry time in AAC frames   */
+#define MAX_SBR_SYN_CHAN              (  64 )
+#define MAX_SBR_COLS                  (  32 )
+
+
+/**
+ * \brief DRC module setting parameters
+ */
+typedef enum
+{
+  DRC_CUT_SCALE = 0,
+  DRC_BOOST_SCALE,
+  TARGET_REF_LEVEL,
+  DRC_BS_DELAY,
+  DRC_DATA_EXPIRY_FRAME,
+  APPLY_HEAVY_COMPRESSION
+
+} AACDEC_DRC_PARAM;
+
+
+/**
+ * \brief DRC module interface functions
+ */
+void aacDecoder_drcInit (
+        HANDLE_AAC_DRC  self );
+
+void aacDecoder_drcInitChannelData (
+        CDrcChannelData *pDrcChannel );
+
+AAC_DECODER_ERROR aacDecoder_drcSetParam (
+        HANDLE_AAC_DRC    self,
+        AACDEC_DRC_PARAM  param,
+        INT               value );
+
+int aacDecoder_drcMarkPayload (
+        HANDLE_AAC_DRC  self,
+        HANDLE_FDK_BITSTREAM  hBs,
+        AACDEC_DRC_PAYLOAD_TYPE  type );
+
+int aacDecoder_drcProlog (
+        HANDLE_AAC_DRC  self,
+        HANDLE_FDK_BITSTREAM hBs,
+        CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[],
+        UCHAR  pceInstanceTag,
+        UCHAR  channelMapping[],
+        int    numChannels );
+
+void aacDecoder_drcApply (
+        HANDLE_AAC_DRC          self,
+        void                   *pSbrDec,
+        CAacDecoderChannelInfo *pAacDecoderChannelInfo,
+        CDrcChannelData        *pDrcDat,
+        int  ch,
+        int  aacFrameSize,
+        int  bSbrPresent );
+
+int aacDecoder_drcEpilog (
+        HANDLE_AAC_DRC  self,
+        HANDLE_FDK_BITSTREAM hBs,
+        CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[],
+        UCHAR  pceInstanceTag,
+        UCHAR  channelMapping[],
+        int    validChannels );
+
+
+#endif  /* AACDEC_DRC_H */