/* -----------------------------------------------------------------------------

Software License for The Fraunhofer FDK AAC Codec Library for Android

© Copyright  1995 - 2021 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

----------------------------------------------------------------------------- */

/*********************** MPEG surround decoder library *************************

   Author(s):

   Description: SAC Dec subband processing

*******************************************************************************/

#include "sac_stp.h"

#include "sac_calcM1andM2.h"

#include "sac_bitdec.h"

#include "FDK_matrixCalloc.h"

#include "sac_rom.h"

#define SF_FREQ_DOMAIN_HEADROOM (2 * (1))

#define BP_GF_START 6

#define BP_GF_SIZE 25

#define HP_SIZE 9

#define STP_UPDATE_ENERGY_RATE 32

#define SF_WET 5

#define SF_DRY \

  3 /* SF_DRY == 2 would produce good conformance test results as well */

#define SF_DRY_NRG                                                           \

  (4 - 1) /* 8.495f = sum(BP_GF__FDK[i])                                     \

             i=0,..,(sizeof(BP_GF__FDK)/sizeof(FIXP_CFG)-1) => energy        \

             calculation needs 4 bits headroom, headroom can be reduced by 1 \

             bit due to fPow2Div2() usage */

#define SF_WET_NRG                                                           \

  (4 - 1) /* 8.495f = sum(BP_GF__FDK[i])                                     \

             i=0,..,(sizeof(BP_GF__FDK)/sizeof(FIXP_CFG)-1) => energy        \

             calculation needs 4 bits headroom, headroom can be reduced by 1 \

             bit due to fPow2Div2() usage */

#define SF_PRODUCT_BP_GF 13

#define SF_PRODUCT_BP_GF_GF 26

#define SF_SCALE 2

#define SF_SCALE_LD64 FL2FXCONST_DBL(0.03125)      /* LD64((1<<SF_SCALE))*/

#define STP_LPF_COEFF1__FDK FL2FXCONST_DBL(0.950f) /* 0.95 */

#define ONE_MINUS_STP_LPF_COEFF1__FDK FL2FXCONST_DBL(0.05f) /* 1.0 - 0.95 */

#define STP_LPF_COEFF2__FDK FL2FXCONST_DBL(0.450f)          /* 0.45 */

#define ONE_MINUS_STP_LPF_COEFF2__FDK \

  FL2FXCONST_DBL(1.0f - 0.450f) /* 1.0 - 0.45 */

#define STP_SCALE_LIMIT__FDK \

  FL2FXCONST_DBL(2.82f / (float)(1 << SF_SCALE)) /* scaled by SF_SCALE */

#define ONE_DIV_STP_SCALE_LIMIT__FDK                                          \

  FL2FXCONST_DBL(1.0f / 2.82f / (float)(1 << SF_SCALE)) /* scaled by SF_SCALE \

                                                         */

#define ABS_THR__FDK       \

  FL2FXCONST_DBL(ABS_THR / \

                 ((float)(1 << (22 + 22 - 26)))) /* scaled by 18 bits */

#define ABS_THR2__FDK                      \

  FL2FXCONST_DBL(ABS_THR * 32.0f * 32.0f / \

                 ((float)(1 << (22 + 22 - 26)))) /* scaled by 10 bits */

#define STP_SCALE_LIMIT_HI \

  FL2FXCONST_DBL(3.02222222222 / (1 << SF_SCALE)) /* see 4. below */

#define STP_SCALE_LIMIT_LO \

  FL2FXCONST_DBL(0.28289992119 / (1 << SF_SCALE)) /* see 4. below */

#define STP_SCALE_LIMIT_HI_LD64                 \

  FL2FXCONST_DBL(0.04986280452) /* see 4. below \

                                 */

#define STP_SCALE_LIMIT_LO_LD64                 \

  FL2FXCONST_DBL(0.05692613500) /* see 4. below \

                                 */

/*  Scale factor calculation for the diffuse signal needs adapted thresholds

    for STP_SCALE_LIMIT and 1/STP_SCALE_LIMIT:

    1. scale = sqrt(DryNrg/WetNrg)

    2. Damping of scale factor

       scale2 = 0.1 + 0.9 * scale

    3. Limiting of scale factor

          STP_SCALE_LIMIT           >=        scale2        >= 1/STP_SCALE_LIMIT

       => STP_SCALE_LIMIT           >=  (0.1 + 0.9 * scale) >= 1/STP_SCALE_LIMIT

       => (STP_SCALE_LIMIT-0.1)/0.9 >=        scale         >=

   (1/STP_SCALE_LIMIT-0.1)/0.9

    3. Limiting of scale factor before sqrt calculation

       ((STP_SCALE_LIMIT-0.1)/0.9)^2 >= (scale^2) >=

   ((1/STP_SCALE_LIMIT-0.1)/0.9)^2 (STP_SCALE_LIMIT_HI)^2        >= (scale^2) >=

   (STP_SCALE_LIMIT_LO)^2

    4. Thresholds for limiting of scale factor

       STP_SCALE_LIMIT_HI      = ((2.82-0.1)/0.9)

       STP_SCALE_LIMIT_LO      = (((1.0/2.82)-0.1)/0.9)

       STP_SCALE_LIMIT_HI_LD64 = LD64(STP_SCALE_LIMIT_HI*STP_SCALE_LIMIT_HI)

       STP_SCALE_LIMIT_LO_LD64 = LD64(STP_SCALE_LIMIT_LO*STP_SCALE_LIMIT_LO)

*/

#define CALC_WET_SCALE(dryIdx, wetIdx)                                         \

  if ((DryEnerLD64[dryIdx] - STP_SCALE_LIMIT_HI_LD64) > WetEnerLD64[wetIdx]) { \

    scale[wetIdx] = STP_SCALE_LIMIT_HI;                                        \

  } else if (DryEnerLD64[dryIdx] <                                             \

             (WetEnerLD64[wetIdx] - STP_SCALE_LIMIT_LO_LD64)) {                \

    scale[wetIdx] = STP_SCALE_LIMIT_LO;                                        \

  } else {                                                                     \

    tmp = ((DryEnerLD64[dryIdx] - WetEnerLD64[wetIdx]) >> 1) - SF_SCALE_LD64;  \

    scale[wetIdx] = CalcInvLdData(tmp);                                        \

  }

struct STP_DEC {

  FIXP_DBL runDryEner[MAX_INPUT_CHANNELS];

  FIXP_DBL runWetEner[MAX_OUTPUT_CHANNELS];

  FIXP_DBL oldDryEnerLD64[MAX_INPUT_CHANNELS];

  FIXP_DBL oldWetEnerLD64[MAX_OUTPUT_CHANNELS];

  FIXP_DBL prev_tp_scale[MAX_OUTPUT_CHANNELS];

  const FIXP_CFG *BP;

  const FIXP_CFG *BP_GF;

  int update_old_ener;

};

inline void combineSignalCplx(FIXP_DBL *hybOutputRealDry,

                              FIXP_DBL *hybOutputImagDry,

                              FIXP_DBL *hybOutputRealWet,

                              FIXP_DBL *hybOutputImagWet, int bands) {

  int n;

  for (n = bands - 1; n >= 0; n--) {

    *hybOutputRealDry = fAddSaturate(*hybOutputRealDry, *hybOutputRealWet);

    *hybOutputImagDry = fAddSaturate(*hybOutputImagDry, *hybOutputImagWet);

    hybOutputRealDry++, hybOutputRealWet++;

    hybOutputImagDry++, hybOutputImagWet++;

  }

}

inline void combineSignalCplxScale1(FIXP_DBL *hybOutputRealDry,

                                    FIXP_DBL *hybOutputImagDry,

                                    FIXP_DBL *hybOutputRealWet,

                                    FIXP_DBL *hybOutputImagWet,

                                    const FIXP_CFG *pBP, FIXP_DBL scaleX,

                                    int bands) {

  int n;

  FIXP_DBL scaleY;

  for (n = bands - 1; n >= 0; n--) {

    scaleY = fMult(scaleX, *pBP);

    *hybOutputRealDry = SATURATE_LEFT_SHIFT(

        (*hybOutputRealDry >> SF_SCALE) + fMult(*hybOutputRealWet, scaleY),

        SF_SCALE, DFRACT_BITS);

    *hybOutputImagDry = SATURATE_LEFT_SHIFT(

        (*hybOutputImagDry >> SF_SCALE) + fMult(*hybOutputImagWet, scaleY),

        SF_SCALE, DFRACT_BITS);

    hybOutputRealDry++, hybOutputRealWet++;

    hybOutputImagDry++, hybOutputImagWet++;

    pBP++;

  }

}

inline void combineSignalCplxScale2(FIXP_DBL *hybOutputRealDry,

                                    FIXP_DBL *hybOutputImagDry,

                                    FIXP_DBL *hybOutputRealWet,

                                    FIXP_DBL *hybOutputImagWet, FIXP_DBL scaleX,

                                    int bands) {

  int n;

  for (n = bands - 1; n >= 0; n--) {

    *hybOutputRealDry = SATURATE_LEFT_SHIFT(

        (*hybOutputRealDry >> SF_SCALE) + fMult(*hybOutputRealWet, scaleX),

        SF_SCALE, DFRACT_BITS);

    *hybOutputImagDry = SATURATE_LEFT_SHIFT(

        (*hybOutputImagDry >> SF_SCALE) + fMult(*hybOutputImagWet, scaleX),

        SF_SCALE, DFRACT_BITS);

    hybOutputRealDry++, hybOutputRealWet++;

    hybOutputImagDry++, hybOutputImagWet++;

  }

}

/*******************************************************************************

 Functionname: subbandTPCreate

 ******************************************************************************/

SACDEC_ERROR subbandTPCreate(HANDLE_STP_DEC *hStpDec) {

  HANDLE_STP_DEC self = NULL;

  FDK_ALLOCATE_MEMORY_1D(self, 1, struct STP_DEC)

  if (hStpDec != NULL) {

    *hStpDec = self;

  }

  return MPS_OK;

bail:

  return MPS_OUTOFMEMORY;

}

SACDEC_ERROR subbandTPInit(HANDLE_STP_DEC self) {

  SACDEC_ERROR err = MPS_OK;

  int ch;

  for (ch = 0; ch < MAX_OUTPUT_CHANNELS; ch++) {

    self->prev_tp_scale[ch] = FL2FXCONST_DBL(1.0f / (1 << SF_SCALE));

    self->oldWetEnerLD64[ch] = FL2FXCONST_DBL(0.0);

  }

  for (ch = 0; ch < MAX_INPUT_CHANNELS; ch++) {

    self->oldDryEnerLD64[ch] = FL2FXCONST_DBL(0.0);

  }

  self->BP = BP__FDK;

  self->BP_GF = BP_GF__FDK;

  self->update_old_ener = 0;

  return err;

}

/*******************************************************************************

 Functionname: subbandTPDestroy

 ******************************************************************************/

void subbandTPDestroy(HANDLE_STP_DEC *hStpDec) {

  if (hStpDec != NULL) {

    FDK_FREE_MEMORY_1D(*hStpDec);

  }

}

/*******************************************************************************

 Functionname: subbandTPApply

 ******************************************************************************/

SACDEC_ERROR subbandTPApply(spatialDec *self, const SPATIAL_BS_FRAME *frame) {

  FIXP_DBL *qmfOutputRealDry[MAX_OUTPUT_CHANNELS];

  FIXP_DBL *qmfOutputImagDry[MAX_OUTPUT_CHANNELS];

  FIXP_DBL *qmfOutputRealWet[MAX_OUTPUT_CHANNELS];

  FIXP_DBL *qmfOutputImagWet[MAX_OUTPUT_CHANNELS];

  FIXP_DBL DryEner[MAX_INPUT_CHANNELS];

  FIXP_DBL scale[MAX_OUTPUT_CHANNELS];

  FIXP_DBL DryEnerLD64[MAX_INPUT_CHANNELS];

  FIXP_DBL WetEnerLD64[MAX_OUTPUT_CHANNELS];

  FIXP_DBL DryEner0 = FL2FXCONST_DBL(0.0f);

  FIXP_DBL WetEnerX, damp, tmp;

  FIXP_DBL dmxReal0, dmxImag0;

  int skipChannels[MAX_OUTPUT_CHANNELS];

  int n, ch, cplxBands, cplxHybBands;

  int dry_scale_dmx, wet_scale_dmx;

  int i_LF, i_RF;

  HANDLE_STP_DEC hStpDec;

  const FIXP_CFG *pBP;

  int nrgScale = (2 * self->clipProtectGainSF__FDK);

  hStpDec = self->hStpDec;

  /* set scalefactor and loop counter */

  FDK_ASSERT(SF_DRY >= 1);

  {

    cplxBands = BP_GF_SIZE;

    cplxHybBands = self->hybridBands;

    if (self->treeConfig == TREE_212) {

      dry_scale_dmx = 2; /* 2 bits to compensate fMultDiv2() and fPow2Div2()

                            used in energy calculation */

    } else {

      dry_scale_dmx = (2 * SF_DRY) - 2;

    }

    wet_scale_dmx = 2;

  }

  /* setup pointer for forming the direct downmix signal */

  for (ch = 0; ch < self->numOutputChannels; ch++) {

    qmfOutputRealDry[ch] = &self->hybOutputRealDry__FDK[ch][7];

    qmfOutputRealWet[ch] = &self->hybOutputRealWet__FDK[ch][7];

    qmfOutputImagDry[ch] = &self->hybOutputImagDry__FDK[ch][7];

    qmfOutputImagWet[ch] = &self->hybOutputImagWet__FDK[ch][7];

  }

  /* clear skipping flag for all output channels */

  FDKmemset(skipChannels, 0, self->numOutputChannels * sizeof(int));

  /* set scale values to zero */

  FDKmemset(scale, 0, self->numOutputChannels * sizeof(FIXP_DBL));

  /* update normalisation energy with latest smoothed energy */

  if (hStpDec->update_old_ener == STP_UPDATE_ENERGY_RATE) {

    hStpDec->update_old_ener = 1;

    for (ch = 0; ch < self->numInputChannels; ch++) {

      hStpDec->oldDryEnerLD64[ch] =

          CalcLdData(fAddSaturate(hStpDec->runDryEner[ch], ABS_THR__FDK));

    }

    for (ch = 0; ch < self->numOutputChannels; ch++) {

      if (self->treeConfig == TREE_212)

        hStpDec->oldWetEnerLD64[ch] =

            CalcLdData(fAddSaturate(hStpDec->runWetEner[ch], ABS_THR__FDK));

      else

        hStpDec->oldWetEnerLD64[ch] =

            CalcLdData(fAddSaturate(hStpDec->runWetEner[ch], ABS_THR2__FDK));

    }

  } else {

    hStpDec->update_old_ener++;

  }

  /* get channel configuration */

  switch (self->treeConfig) {

    case TREE_212:

      i_LF = 0;

      i_RF = 1;

      break;

    default:

      return MPS_WRONG_TREECONFIG;

  }

  /* form the 'direct' downmix signal */

  pBP = hStpDec->BP_GF - BP_GF_START;

  switch (self->treeConfig) {

    case TREE_212:

      INT sMin, sNorm, sReal, sImag;

      sReal = fMin(getScalefactor(&qmfOutputRealDry[i_LF][BP_GF_START],

                                  cplxBands - BP_GF_START),

                   getScalefactor(&qmfOutputRealDry[i_RF][BP_GF_START],

                                  cplxBands - BP_GF_START));

      sImag = fMin(getScalefactor(&qmfOutputImagDry[i_LF][BP_GF_START],

                                  cplxBands - BP_GF_START),

                   getScalefactor(&qmfOutputImagDry[i_RF][BP_GF_START],

                                  cplxBands - BP_GF_START));

      sMin = fMin(sReal, sImag) - 1;

      for (n = BP_GF_START; n < cplxBands; n++) {

        dmxReal0 = scaleValue(qmfOutputRealDry[i_LF][n], sMin) +

                   scaleValue(qmfOutputRealDry[i_RF][n], sMin);

        dmxImag0 = scaleValue(qmfOutputImagDry[i_LF][n], sMin) +

                   scaleValue(qmfOutputImagDry[i_RF][n], sMin);

        DryEner0 += (fMultDiv2(fPow2Div2(dmxReal0), pBP[n]) +

                     fMultDiv2(fPow2Div2(dmxImag0), pBP[n])) >>

                    SF_DRY_NRG;

      }

      sNorm = SF_FREQ_DOMAIN_HEADROOM + SF_DRY_NRG + dry_scale_dmx -

              (2 * sMin) + nrgScale;

      DryEner0 = scaleValueSaturate(

          DryEner0, fMax(fMin(sNorm, DFRACT_BITS - 1), -(DFRACT_BITS - 1)));

      break;

    default:;

  }

  DryEner[0] = DryEner0;

  /* normalise the 'direct' signals */

  for (ch = 0; ch < self->numInputChannels; ch++) {

    if (self->treeConfig != TREE_212) DryEner[ch] = DryEner[ch] << nrgScale;

    hStpDec->runDryEner[ch] =

        fMult(STP_LPF_COEFF1__FDK, hStpDec->runDryEner[ch]) +

        fMult(ONE_MINUS_STP_LPF_COEFF1__FDK, DryEner[ch]);

    if (DryEner[ch] != FL2FXCONST_DBL(0.0f)) {

      DryEnerLD64[ch] =

          fixMax((CalcLdData(DryEner[ch]) - hStpDec->oldDryEnerLD64[ch]),

                 FL2FXCONST_DBL(-0.484375f));

    } else {

      DryEnerLD64[ch] = FL2FXCONST_DBL(-0.484375f);

    }

  }

  for (; ch < MAX_INPUT_CHANNELS; ch++) {

    DryEnerLD64[ch] = FL2FXCONST_DBL(-0.484375f);

  }

  /* normalise the 'diffuse' signals */

  pBP = hStpDec->BP_GF - BP_GF_START;

  for (ch = 0; ch < self->numOutputChannels; ch++) {

    if (skipChannels[ch]) {

      continue;

    }

    WetEnerX = FL2FXCONST_DBL(0.0f);

    if (self->treeConfig == TREE_212) {

      INT sMin, sNorm;

      sMin = fMin(getScalefactor(&qmfOutputRealWet[ch][BP_GF_START],

                                 cplxBands - BP_GF_START),

                  getScalefactor(&qmfOutputImagWet[ch][BP_GF_START],

                                 cplxBands - BP_GF_START));

      for (n = BP_GF_START; n < cplxBands; n++) {

        WetEnerX +=

            (fMultDiv2(fPow2Div2(scaleValue(qmfOutputRealWet[ch][n], sMin)),

                       pBP[n]) +

             fMultDiv2(fPow2Div2(scaleValue(qmfOutputImagWet[ch][n], sMin)),

                       pBP[n])) >>

            SF_WET_NRG;

      }

      sNorm = SF_FREQ_DOMAIN_HEADROOM + SF_WET_NRG + wet_scale_dmx -

              (2 * sMin) + nrgScale;

      WetEnerX = scaleValueSaturate(

          WetEnerX, fMax(fMin(sNorm, DFRACT_BITS - 1), -(DFRACT_BITS - 1)));

    } else

      FDK_ASSERT(self->treeConfig == TREE_212);

    hStpDec->runWetEner[ch] =

        fMult(STP_LPF_COEFF1__FDK, hStpDec->runWetEner[ch]) +

        fMult(ONE_MINUS_STP_LPF_COEFF1__FDK, WetEnerX);

    if (WetEnerX == FL2FXCONST_DBL(0.0f)) {

      WetEnerLD64[ch] = FL2FXCONST_DBL(-0.484375f);

    } else {

      WetEnerLD64[ch] =

          fixMax((CalcLdData(WetEnerX) - hStpDec->oldWetEnerLD64[ch]),

                 FL2FXCONST_DBL(-0.484375f));

    }

  }

  /* compute scale factor for the 'diffuse' signals */

  switch (self->treeConfig) {

    case TREE_212:

      if (DryEner[0] != FL2FXCONST_DBL(0.0f)) {

        CALC_WET_SCALE(0, i_LF);

        CALC_WET_SCALE(0, i_RF);

      }

      break;

    default:;

  }

  damp = FL2FXCONST_DBL(0.1f / (1 << SF_SCALE));

  for (ch = 0; ch < self->numOutputChannels; ch++) {

    /* damp the scaling factor */

    scale[ch] = damp + fMult(FL2FXCONST_DBL(0.9f), scale[ch]);

    /* limiting the scale factor */

    if (scale[ch] > STP_SCALE_LIMIT__FDK) {

      scale[ch] = STP_SCALE_LIMIT__FDK;

    }

    if (scale[ch] < ONE_DIV_STP_SCALE_LIMIT__FDK) {

      scale[ch] = ONE_DIV_STP_SCALE_LIMIT__FDK;

    }

    /* low pass filter the scaling factor */

    scale[ch] =

        fMult(STP_LPF_COEFF2__FDK, scale[ch]) +

        fMult(ONE_MINUS_STP_LPF_COEFF2__FDK, hStpDec->prev_tp_scale[ch]);

    hStpDec->prev_tp_scale[ch] = scale[ch];

  }

  /* combine 'direct' and scaled 'diffuse' signal */

  FDK_ASSERT((HP_SIZE - 3 + 10 - 1) == PC_NUM_HYB_BANDS);

  const SCHAR *channlIndex = row2channelSTP[self->treeConfig];

  for (ch = 0; ch < self->numOutputChannels; ch++) {

    int no_scaling;

    no_scaling = !frame->tempShapeEnableChannelSTP[channlIndex[ch]];

    if (no_scaling) {

      combineSignalCplx(

          &self->hybOutputRealDry__FDK[ch][self->tp_hybBandBorder],

          &self->hybOutputImagDry__FDK[ch][self->tp_hybBandBorder],

          &self->hybOutputRealWet__FDK[ch][self->tp_hybBandBorder],

          &self->hybOutputImagWet__FDK[ch][self->tp_hybBandBorder],

          cplxHybBands - self->tp_hybBandBorder);

    } else {

      FIXP_DBL scaleX;

      scaleX = scale[ch];

      pBP = hStpDec->BP - self->tp_hybBandBorder;

      /* Band[HP_SIZE-3+10-1] needs not to be processed in

         combineSignalCplxScale1(), because pB[HP_SIZE-3+10-1] would be 1.0 */

      combineSignalCplxScale1(

          &self->hybOutputRealDry__FDK[ch][self->tp_hybBandBorder],

          &self->hybOutputImagDry__FDK[ch][self->tp_hybBandBorder],

          &self->hybOutputRealWet__FDK[ch][self->tp_hybBandBorder],

          &self->hybOutputImagWet__FDK[ch][self->tp_hybBandBorder],

          &pBP[self->tp_hybBandBorder], scaleX,

          (HP_SIZE - 3 + 10 - 1) - self->tp_hybBandBorder);

      {

        combineSignalCplxScale2(

            &self->hybOutputRealDry__FDK[ch][HP_SIZE - 3 + 10 - 1],

            &self->hybOutputImagDry__FDK[ch][HP_SIZE - 3 + 10 - 1],

            &self->hybOutputRealWet__FDK[ch][HP_SIZE - 3 + 10 - 1],

            &self->hybOutputImagWet__FDK[ch][HP_SIZE - 3 + 10 - 1], scaleX,

            cplxHybBands - (HP_SIZE - 3 + 10 - 1));

      }

    }

  }

  return (SACDEC_ERROR)MPS_OK;

  ;

}