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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
+----------------------------------------------------------------------------- */
+
+/**************************** SBR encoder library ******************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+/*!
+  \file
+  \brief  Transient detector prototypes $Revision: 95111 $
+*/
+#ifndef TRAN_DET_H
+#define TRAN_DET_H
+
+#include "sbr_encoder.h"
+#include "sbr_def.h"
+
+typedef struct {
+  FIXP_DBL transients[32 + (32 / 2)];
+  FIXP_DBL thresholds[64];
+  FIXP_DBL tran_thr;    /* Master threshold for transient signals */
+  FIXP_DBL split_thr_m; /* Threshold for splitting FIXFIX-frames into 2 env */
+  INT split_thr_e;      /* Scale for splitting threshold */
+  FIXP_DBL prevLowBandEnergy;  /* Energy of low band */
+  FIXP_DBL prevHighBandEnergy; /* Energy of high band */
+  INT tran_fc;                 /* Number of lowband subbands to discard  */
+  INT no_cols;
+  INT no_rows;
+  INT mode;
+
+  int frameShift;
+  int tran_off; /* Offset for reading energy values. */
+} SBR_TRANSIENT_DETECTOR;
+
+typedef SBR_TRANSIENT_DETECTOR *HANDLE_SBR_TRANSIENT_DETECTOR;
+
+#define TRAN_DET_LOOKAHEAD 2
+#define TRAN_DET_START_FREQ 4500 /*start frequency for transient detection*/
+#define TRAN_DET_STOP_FREQ 13500 /*stop frequency for transient detection*/
+#define TRAN_DET_MIN_QMFBANDS                    \
+  4 /* minimum qmf bands for transient detection \
+     */
+#define QMF_HP_dBd_SLOPE_FIX \
+  FL2FXCONST_DBL(0.00075275f) /* 0.002266f/10 * log2(10) */
+#define TRAN_DET_THRSHLD FL2FXCONST_DBL(5.0f / 8.0f)
+#define TRAN_DET_THRSHLD_SCALE (3)
+
+typedef struct {
+  INT transientCandidates[32 + TRAN_DET_LOOKAHEAD];
+  INT nTimeSlots;
+  INT lookahead;
+  INT startBand;
+  INT stopBand;
+
+  FIXP_DBL dBf_m[64];
+  INT dBf_e[64];
+
+  FIXP_DBL energy_timeSlots[32 + TRAN_DET_LOOKAHEAD];
+  INT energy_timeSlots_scale[32 + TRAN_DET_LOOKAHEAD];
+
+  FIXP_DBL delta_energy[32 + TRAN_DET_LOOKAHEAD];
+  INT delta_energy_scale[32 + TRAN_DET_LOOKAHEAD];
+
+  FIXP_DBL lowpass_energy[32 + TRAN_DET_LOOKAHEAD];
+  INT lowpass_energy_scale[32 + TRAN_DET_LOOKAHEAD];
+} FAST_TRAN_DETECTOR;
+typedef FAST_TRAN_DETECTOR *HANDLE_FAST_TRAN_DET;
+
+INT FDKsbrEnc_InitSbrFastTransientDetector(
+    HANDLE_FAST_TRAN_DET h_sbrFastTransientDetector,
+    const INT time_slots_per_frame, const INT bandwidth_qmf_slot,
+    const INT no_qmf_channels, const INT sbr_qmf_1st_band);
+
+void FDKsbrEnc_fastTransientDetect(
+    const HANDLE_FAST_TRAN_DET h_sbrFastTransientDetector,
+    const FIXP_DBL *const *Energies, const int *const scaleEnergies,
+    const INT YBufferWriteOffset, UCHAR *const tran_vector);
+
+void FDKsbrEnc_transientDetect(
+    HANDLE_SBR_TRANSIENT_DETECTOR h_sbrTransientDetector, FIXP_DBL **Energies,
+    INT *scaleEnergies, UCHAR *tran_vector, int YBufferWriteOffset,
+    int YBufferSzShift, int timeStep, int frameMiddleBorder);
+
+int FDKsbrEnc_InitSbrTransientDetector(
+    HANDLE_SBR_TRANSIENT_DETECTOR h_sbrTransientDetector,
+    UINT sbrSyntaxFlags, /* SBR syntax flags derived from AOT. */
+    INT frameSize, INT sampleFreq, sbrConfigurationPtr params, int tran_fc,
+    int no_cols, int no_rows, int YBufferWriteOffset, int YBufferSzShift,
+    int frameShift, int tran_off);
+
+void FDKsbrEnc_frameSplitter(
+    FIXP_DBL **Energies, INT *scaleEnergies,
+    HANDLE_SBR_TRANSIENT_DETECTOR h_sbrTransientDetector, UCHAR *freqBandTable,
+    UCHAR *tran_vector, int YBufferWriteOffset, int YBufferSzShift, int nSfb,
+    int timeStep, int no_cols, FIXP_DBL *tonality);
+#endif