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diff --git a/libAACenc/src/psy_data.h b/libAACenc/src/psy_data.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: Psychoaccoustic data
+
+******************************************************************************/
+#ifndef _PSY_DATA_H
+#define _PSY_DATA_H
+
+
+#include "block_switch.h"
+
+/* Be careful with MAX_SFB_LONG as length of the .Long arrays.
+ * sfbEnergy.Long and sfbEnergyMS.Long and sfbThreshold.Long are used as a temporary storage for the regrouped
+ * short energies and thresholds between FDKaacEnc_groupShortData() and BuildInterface() in FDKaacEnc_psyMain().
+ * The space required for this is MAX_GROUPED_SFB ( = MAX_NO_OF_GROUPS*MAX_SFB_SHORT ).
+ * However, this is not important if unions are used (which is not possible with pfloat). */
+
+typedef shouldBeUnion{
+  FIXP_DBL  Long[MAX_GROUPED_SFB];
+  FIXP_DBL  Short[TRANS_FAC][MAX_SFB_SHORT];
+}SFB_THRESHOLD;
+
+typedef shouldBeUnion{
+  FIXP_DBL  Long[MAX_GROUPED_SFB];
+  FIXP_DBL  Short[TRANS_FAC][MAX_SFB_SHORT];
+}SFB_ENERGY;
+
+typedef shouldBeUnion{
+  FIXP_DBL  Long[MAX_GROUPED_SFB];
+  FIXP_DBL  Short[TRANS_FAC][MAX_SFB_SHORT];
+}SFB_LD_ENERGY;
+
+typedef shouldBeUnion{
+  INT  Long[MAX_GROUPED_SFB];
+  INT  Short[TRANS_FAC][MAX_SFB_SHORT];
+}SFB_MAX_SCALE;
+
+
+typedef struct{
+  INT_PCM*                  psyInputBuffer;
+  FIXP_DBL  RESTRICT        overlapAddBuffer[1024];
+
+  BLOCK_SWITCHING_CONTROL   blockSwitchingControl;              /* block switching */
+  FIXP_DBL                  sfbThresholdnm1[MAX_SFB];           /* FDKaacEnc_PreEchoControl */
+  INT                       mdctScalenm1;                       /* scale of last block's mdct (FDKaacEnc_PreEchoControl) */
+  INT                       calcPreEcho;
+  INT                       isLFE;
+}PSY_STATIC;
+
+
+typedef struct{
+  FIXP_DBL                 *mdctSpectrum;
+  SFB_THRESHOLD             sfbThreshold;                       /* adapt                                  */
+  SFB_ENERGY                sfbEnergy;                          /* sfb energies                           */
+  SFB_LD_ENERGY             sfbEnergyLdData;                    /* sfb energies in ldData format          */
+  SFB_MAX_SCALE             sfbMaxScaleSpec;
+  SFB_ENERGY                sfbEnergyMS;                        /* mid/side sfb energies                  */
+  FIXP_DBL                  sfbEnergyMSLdData[MAX_GROUPED_SFB]; /* mid/side sfb energies in ldData format */
+  SFB_ENERGY                sfbSpreadEnergy;
+  INT                       mdctScale;                          /* exponent of data in mdctSpectrum       */
+  INT                       groupedSfbOffset[MAX_GROUPED_SFB+1];
+  INT                       sfbActive;
+  INT                       lowpassLine;
+}PSY_DATA;
+
+
+#endif /* _PSY_DATA_H */