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+/*****************************  MPEG-4 AAC 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.
+
+
+   $Id$
+   Author(s):   M. Werner
+   Description: Block switching
+
+   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 _BLOCK_SWITCH_H
+#define _BLOCK_SWITCH_H
+
+#include "common_fix.h"
+
+#include "psy_const.h"
+
+/****************** Defines ******************************/
+  #define BLOCK_SWITCH_WINDOWS    8                   /* number of windows for energy calculation */
+
+#define BLOCK_SWITCHING_IIR_LEN    2                  /* Length of HighPass-IIR-Filter for Attack-Detection */
+#define BLOCK_SWITCH_ENERGY_SHIFT  7                  /* should be logDualis(BLOCK_SWITCH_WINDOW_LEN) to avoid overflow in windowNrgs. */
+
+#define LAST_WINDOW 0
+#define THIS_WINDOW 1
+
+
+/****************** Structures ***************************/
+typedef struct{
+  INT_PCM *timeSignal;
+  INT   lastWindowSequence;
+  INT   windowShape;
+  INT   lastWindowShape;
+  UINT  nBlockSwitchWindows;                       /* number of windows for energy calculation */
+  INT   attack;
+  INT   lastattack;
+  INT   attackIndex;
+  INT   lastAttackIndex;
+  INT   allowShortFrames;                          /* for Low Delay, don't allow short frames */
+  INT   allowLookAhead;                            /* for Low Delay, don't do look-ahead */
+  INT   noOfGroups;
+  INT   groupLen[MAX_NO_OF_GROUPS];
+  FIXP_DBL maxWindowNrg;                           /* max energy in subwindows */
+
+  FIXP_DBL windowNrg[2][BLOCK_SWITCH_WINDOWS];     /* time signal energy in Subwindows (last and current) */
+  FIXP_DBL windowNrgF[2][BLOCK_SWITCH_WINDOWS];    /* filtered time signal energy in segments (last and current) */
+  FIXP_DBL accWindowNrg;                           /* recursively accumulated windowNrgF */
+
+  FIXP_DBL iirStates[BLOCK_SWITCHING_IIR_LEN];     /* filter delay-line */
+
+} BLOCK_SWITCHING_CONTROL;
+
+
+
+
+
+void FDKaacEnc_InitBlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControl, INT isLowDelay);
+
+int FDKaacEnc_BlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControl, const INT granuleLength, const int isLFE);
+
+int FDKaacEnc_SyncBlockSwitching(
+      BLOCK_SWITCHING_CONTROL *blockSwitchingControlLeft,
+      BLOCK_SWITCHING_CONTROL *blockSwitchingControlRight,
+      const INT noOfChannels,
+      const INT commonWindow);
+
+#endif  /* #ifndef _BLOCK_SWITCH_H */