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+/* -----------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
+Forschung e.V. All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
+that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
+scheme for digital audio. This FDK AAC Codec software is intended to be used on
+a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
+general perceptual audio codecs. AAC-ELD is considered the best-performing
+full-bandwidth communications codec by independent studies and is widely
+deployed. AAC has been standardized by ISO and IEC as part of the MPEG
+specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including
+those of Fraunhofer) may be obtained through Via Licensing
+(www.vialicensing.com) or through the respective patent owners individually for
+the purpose of encoding or decoding bit streams in products that are compliant
+with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
+Android devices already license these patent claims through Via Licensing or
+directly from the patent owners, and therefore FDK AAC Codec software may
+already be covered under those patent licenses when it is used for those
+licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions
+with enhanced sound quality, are also available from Fraunhofer. Users are
+encouraged to check the Fraunhofer website for additional applications
+information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted without payment of copyright license fees provided that you
+satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of
+the FDK AAC Codec or your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. You must make available free of
+charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
+limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
+Fraunhofer provides no warranty of patent non-infringement with respect to this
+software.
+
+You may use this FDK AAC Codec software or modifications thereto only for
+purposes that are authorized by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
+holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
+including but not limited to the implied warranties of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------- */
+
+/**************************** AAC encoder library ******************************
+
+   Author(s):   M. Werner
+
+   Description: Block switching
+
+*******************************************************************************/
+
+#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 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,
+                             const INT_PCM *pTimeSignal);
+
+int FDKaacEnc_SyncBlockSwitching(
+    BLOCK_SWITCHING_CONTROL *blockSwitchingControlLeft,
+    BLOCK_SWITCHING_CONTROL *blockSwitchingControlRight, const INT noOfChannels,
+    const INT commonWindow);
+
+#endif /* #ifndef BLOCK_SWITCH_H */