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diff --git a/libAACenc/src/aacenc_tns.h b/libAACenc/src/aacenc_tns.h
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+++ b/libAACenc/src/aacenc_tns.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:       Alex Groeschel
+   contents/description: Temporal noise shaping
+
+******************************************************************************/
+#ifndef _TNS_H
+#define _TNS_H
+
+#include "common_fix.h"
+
+#include "psy_const.h"
+
+
+#ifndef PI
+#define PI            3.1415926535897931f
+#endif
+
+/**
+ * TNS_ENABLE_MASK
+ * This bitfield defines which TNS features are enabled
+ *   The TNS mask is composed of 4 bits.
+ *   tnsMask |= 0x1; activate TNS short blocks
+ *   tnsMask |= 0x2; activate TNS for long blocks
+ *   tnsMask |= 0x4; activate TNS PEAK tool for short blocks
+ *   tnsMask |= 0x8; activate TNS PEAK tool for long blocks
+ */
+#define TNS_ENABLE_MASK 0xf
+
+/* TNS max filter order for Low Complexity MPEG4 profile */
+#define TNS_MAX_ORDER 12
+
+
+#define MAX_NUM_OF_FILTERS 2
+
+
+typedef struct{ /*stuff that is tabulated dependent on bitrate etc. */
+  INT     filterEnabled[MAX_NUM_OF_FILTERS];
+  INT     threshOn[MAX_NUM_OF_FILTERS];                /* min. prediction gain for using tns TABUL*/
+  INT     tnsLimitOrder[MAX_NUM_OF_FILTERS];           /* Limit for TNS order TABUL*/
+  INT     tnsFilterDirection[MAX_NUM_OF_FILTERS];      /* Filtering direction, 0=up, 1=down TABUL */
+  INT     acfSplit[MAX_NUM_OF_FILTERS];
+  INT     seperateFiltersAllowed;
+
+}TNS_CONFIG_TABULATED;
+
+
+
+typedef struct {   /*assigned at InitTime*/
+  TNS_CONFIG_TABULATED confTab;
+  INT tnsActive;
+  INT maxOrder;                /* max. order of tns filter */
+  INT coefRes;
+  FIXP_DBL acfWindow[MAX_NUM_OF_FILTERS][TNS_MAX_ORDER+3+1];
+  /* now some things that only probably can be done at Init time;
+     could be they have to be split up for each individual (short) window or
+     even filter.  */
+  INT lpcStartBand[MAX_NUM_OF_FILTERS];
+  INT lpcStartLine[MAX_NUM_OF_FILTERS];
+  INT lpcStopBand;
+  INT lpcStopLine;
+
+}TNS_CONFIG;
+
+
+typedef struct {
+  INT   tnsActive;
+  INT   predictionGain;
+} TNS_SUBBLOCK_INFO;
+
+typedef struct{   /*changed at runTime*/
+  TNS_SUBBLOCK_INFO subBlockInfo[TRANS_FAC];
+  FIXP_DBL ratioMultTable[TRANS_FAC][MAX_SFB_SHORT];
+} TNS_DATA_SHORT;
+
+typedef struct{   /*changed at runTime*/
+  TNS_SUBBLOCK_INFO subBlockInfo;
+  FIXP_DBL ratioMultTable[MAX_SFB_LONG];
+} TNS_DATA_LONG;
+
+/* can be implemented as union */
+typedef shouldBeUnion{
+  TNS_DATA_LONG Long;
+  TNS_DATA_SHORT Short;
+}TNS_DATA_RAW;
+
+typedef struct{
+  INT numOfSubblocks;
+  TNS_DATA_RAW dataRaw;
+  INT tnsMaxScaleSpec;
+  INT filtersMerged;
+}TNS_DATA;
+
+typedef struct{
+  INT numOfFilters[TRANS_FAC];
+  INT coefRes[TRANS_FAC];
+  INT length[TRANS_FAC][MAX_NUM_OF_FILTERS];
+  INT order[TRANS_FAC][MAX_NUM_OF_FILTERS];
+  INT direction[TRANS_FAC][MAX_NUM_OF_FILTERS];
+  INT coefCompress[TRANS_FAC][MAX_NUM_OF_FILTERS];
+    /* for Long: length TNS_MAX_ORDER (12 for LC) is required -> 12 */
+    /* for Short: length TRANS_FAC*TNS_MAX_ORDER (only 5 for short LC) is required -> 8*5=40 */
+    /* Currently TRANS_FAC*TNS_MAX_ORDER = 8*12 = 96 (for LC) is used (per channel)! Memory could be saved here! */
+  INT coef[TRANS_FAC][MAX_NUM_OF_FILTERS][TNS_MAX_ORDER];
+}TNS_INFO;
+
+INT FDKaacEnc_FreqToBandWithRounding(
+        const INT freq,
+        const INT fs,
+        const INT numOfBands,
+        const INT *bandStartOffset
+        );
+
+#endif /* _TNS_H */