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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 decoder library ******************************
+
+   Author(s):
+
+   Description:
+
+*******************************************************************************/
+
+/*!
+  \file
+  \brief  Sbr decoder
+*/
+#ifndef PSDEC_H
+#define PSDEC_H
+
+#include "sbrdecoder.h"
+#include "FDK_hybrid.h"
+
+#include "FDK_decorrelate.h"
+
+/* This PS decoder implements the baseline version. So it always uses the     */
+/* hybrid filter structure for 20 stereo bands and does not implemet IPD/OPD  */
+/* synthesis. The baseline version has to support the complete PS bitstream   */
+/* syntax. But IPD/OPD data is ignored and set to 0. If 34 stereo band config */
+/* is used in the bitstream for IIS/ICC the decoded parameters are mapped to  */
+/* 20 stereo bands.                                                           */
+
+#include "FDK_bitstream.h"
+
+#define SCAL_HEADROOM (2)
+
+#define PS_EXTENSION_SIZE_BITS (4)
+#define PS_EXTENSION_ESC_COUNT_BITS (8)
+
+#define NO_QMF_CHANNELS (64)
+#define MAX_NUM_COL (32)
+
+#define NO_QMF_BANDS_HYBRID20 (3)
+#define NO_SUB_QMF_CHANNELS (12)
+#define HYBRID_FILTER_DELAY (6)
+
+#define MAX_NO_PS_ENV (4 + 1) /* +1 needed for VAR_BORDER */
+
+#define NO_HI_RES_BINS (34)
+#define NO_MID_RES_BINS (20)
+#define NO_LOW_RES_BINS (10)
+
+#define NO_HI_RES_IID_BINS (NO_HI_RES_BINS)
+#define NO_HI_RES_ICC_BINS (NO_HI_RES_BINS)
+
+#define NO_MID_RES_IID_BINS (NO_MID_RES_BINS)
+#define NO_MID_RES_ICC_BINS (NO_MID_RES_BINS)
+
+#define NO_LOW_RES_IID_BINS (NO_LOW_RES_BINS)
+#define NO_LOW_RES_ICC_BINS (NO_LOW_RES_BINS)
+
+#define SUBQMF_GROUPS (10)
+#define QMF_GROUPS (12)
+
+//#define SUBQMF_GROUPS_HI_RES            ( 32 )
+//#define QMF_GROUPS_HI_RES               ( 18 )
+
+#define NO_IID_GROUPS (SUBQMF_GROUPS + QMF_GROUPS)
+//#define NO_IID_GROUPS_HI_RES            ( SUBQMF_GROUPS_HI_RES +
+// QMF_GROUPS_HI_RES )
+
+#define NO_IID_STEPS (7)       /* 1 .. + 7 */
+#define NO_IID_STEPS_FINE (15) /* 1 .. +15 */
+#define NO_ICC_STEPS (8)       /* 0 .. + 7 */
+
+#define NO_IID_LEVELS (2 * NO_IID_STEPS + 1)           /* - 7 ..  + 7 */
+#define NO_IID_LEVELS_FINE (2 * NO_IID_STEPS_FINE + 1) /* -15 ..  +15 */
+#define NO_ICC_LEVELS (NO_ICC_STEPS)                   /*   0 ..  + 7 */
+
+#define FIXP_SQRT05 ((FIXP_DBL)0x5a827980) /* 1/SQRT2 */
+
+struct PS_DEC_COEFFICIENTS {
+  FIXP_DBL H11r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
+  FIXP_DBL H12r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
+  FIXP_DBL H21r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
+  FIXP_DBL H22r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
+
+  FIXP_DBL
+  DeltaH11r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
+  FIXP_DBL
+  DeltaH12r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
+  FIXP_DBL
+  DeltaH21r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
+  FIXP_DBL
+  DeltaH22r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
+
+  SCHAR
+  aaIidIndexMapped[MAX_NO_PS_ENV]
+                  [NO_HI_RES_IID_BINS]; /*!< The mapped IID index for all
+                                           envelopes and all IID bins */
+  SCHAR
+  aaIccIndexMapped[MAX_NO_PS_ENV]
+                  [NO_HI_RES_ICC_BINS]; /*!< The mapped ICC index for all
+                                           envelopes and all ICC bins */
+};
+
+typedef enum { ppt_none = 0, ppt_mpeg = 1, ppt_drm = 2 } PS_PAYLOAD_TYPE;
+
+typedef struct {
+  UCHAR bPsHeaderValid; /*!< set if new header is available from bitstream */
+
+  UCHAR bEnableIid; /*!< One bit denoting the presence of IID parameters */
+  UCHAR bEnableIcc; /*!< One bit denoting the presence of ICC parameters */
+  UCHAR bEnableExt; /*!< The PS extension layer is enabled using the enable_ext
+                       bit. If it is set to %1 the IPD and OPD parameters are
+                       sent. If it is disabled, i.e. %0, the extension layer is
+                       skipped.   */
+
+  UCHAR
+  modeIid;       /*!< The configuration of IID parameters (number of bands and
+                      quantisation grid, iid_quant) is determined by iid_mode.   */
+  UCHAR modeIcc; /*!< The configuration of Inter-channel Coherence parameters
+                      (number of bands and quantisation grid) is determined by
+                      icc_mode. */
+
+  UCHAR freqResIid; /*!< 0=low, 1=mid or 2=high frequency resolution for iid */
+  UCHAR freqResIcc; /*!< 0=low, 1=mid or 2=high frequency resolution for icc */
+
+  UCHAR bFineIidQ; /*!< Use fine Iid quantisation. */
+
+  UCHAR bFrameClass; /*!< The frame_class bit determines whether the parameter
+                          positions of the current frame are uniformly spaced
+                          accross the frame or they are defined using the
+                        positions described by border_position.
+                      */
+
+  UCHAR noEnv; /*!< The number of envelopes per frame */
+  UCHAR aEnvStartStop[MAX_NO_PS_ENV + 1]; /*!< In case of variable parameter
+                                             spacing the parameter positions are
+                                             determined by border_position */
+
+  SCHAR abIidDtFlag[MAX_NO_PS_ENV]; /*!< Deltacoding time/freq flag for IID, 0
+                                       => freq           */
+  SCHAR abIccDtFlag[MAX_NO_PS_ENV]; /*!< Deltacoding time/freq flag for ICC, 0
+                                       => freq           */
+
+  SCHAR
+  aaIidIndex[MAX_NO_PS_ENV]
+            [NO_HI_RES_IID_BINS]; /*!< The IID index for all envelopes and
+                                     all IID bins        */
+  SCHAR
+  aaIccIndex[MAX_NO_PS_ENV]
+            [NO_HI_RES_ICC_BINS]; /*!< The ICC index for all envelopes and
+                                     all ICC bins        */
+
+} MPEG_PS_BS_DATA;
+
+struct PS_DEC {
+  SCHAR noSubSamples;
+  SCHAR noChannels;
+
+  SCHAR procFrameBased; /*!< Helper to detected switching from frame based to
+                           slot based processing
+                         */
+
+  PS_PAYLOAD_TYPE
+  bPsDataAvail[(1) + 1]; /*!< set if new data available from bitstream */
+  UCHAR psDecodedPrv;    /*!< set if PS has been processed in the last frame */
+
+  /* helpers for frame delay line */
+  UCHAR bsLastSlot;  /*!< Index of last read slot.  */
+  UCHAR bsReadSlot;  /*!< Index of current read slot for additional delay.  */
+  UCHAR processSlot; /*!< Index of current slot for processing (need for add.
+                        delay).   */
+
+  union { /* Bitstream data */
+    MPEG_PS_BS_DATA
+    mpeg; /*!< Struct containing all MPEG specific PS data from bitstream.
+           */
+  } bsData[(1) + 1];
+
+  shouldBeUnion { /* Static data */
+    struct {
+      SCHAR aIidPrevFrameIndex[NO_HI_RES_IID_BINS]; /*!< The IID index for
+                                                       previous frame */
+      SCHAR aIccPrevFrameIndex[NO_HI_RES_ICC_BINS]; /*!< The ICC index for
+                                                       previous frame */
+      UCHAR
+      bPrevFrameFineIidQ;   /*!< The IID quantization of the previous frame */
+      UCHAR prevFreqResIid; /*!< Frequency resolution for IID of the previous
+                               frame            */
+      UCHAR prevFreqResIcc; /*!< Frequency resolution for ICC of the previous
+                               frame            */
+      UCHAR lastUsb; /*!< uppermost WMF delay band of last frame          */
+
+      FIXP_DBL pHybridAnaStatesLFdmx
+          [2 * 13 * NO_QMF_BANDS_HYBRID20]; /*!< Memory used in hybrid analysis
+                                                 for filter states. */
+      FDK_ANA_HYB_FILTER hybridAnalysis;
+      FDK_SYN_HYB_FILTER hybridSynthesis[2];
+
+      DECORR_DEC apDecor; /*!< Decorrelator instance. */
+      FIXP_DBL decorrBufferCplx[(2 * ((825) + (373)))];
+
+      FIXP_DBL h11rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy)
+                                           coefficients */
+      FIXP_DBL h12rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy)
+                                           coefficients */
+      FIXP_DBL h21rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy)
+                                           coefficients */
+      FIXP_DBL h22rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy)
+                                           coefficients */
+
+      PS_DEC_COEFFICIENTS
+      *pCoef; /*!< temporal coefficients are on reusable scratch memory */
+
+    } mpeg;
+  }
+  specificTo;
+};
+
+typedef struct PS_DEC *HANDLE_PS_DEC;
+
+int CreatePsDec(HANDLE_PS_DEC *h_PS_DEC, int aacSamplesPerFrame);
+
+int DeletePsDec(HANDLE_PS_DEC *h_PS_DEC);
+
+void PreparePsProcessing(HANDLE_PS_DEC h_ps_d,
+                         const FIXP_DBL *const *const rIntBufferLeft,
+                         const FIXP_DBL *const *const iIntBufferLeft,
+                         const int scaleFactorLowBand);
+
+void initSlotBasedRotation(HANDLE_PS_DEC h_ps_d, int env, int usb);
+
+void ApplyPsSlot(
+    HANDLE_PS_DEC h_ps_d,      /* parametric stereo decoder handle    */
+    FIXP_DBL **rIntBufferLeft, /* real values of left qmf timeslot    */
+    FIXP_DBL **iIntBufferLeft, /* imag values of left qmf timeslot    */
+    FIXP_DBL *rIntBufferRight, /* real values of right qmf timeslot   */
+    FIXP_DBL *iIntBufferRight, /* imag values of right qmf timeslot   */
+    const int scaleFactorLowBand_no_ov, const int scaleFactorLowBand,
+    const int scaleFactorHighBand, const int lsb, const int usb);
+
+#endif /* PSDEC_H */