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

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):   M. Multrus

   Description: PS Wrapper, Downmix

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

#include "ps_main.h"

/* Includes ******************************************************************/

#include "ps_bitenc.h"

#include "sbrenc_ram.h"

/*--------------- function declarations --------------------*/

static void psFindBestScaling(

    HANDLE_PARAMETRIC_STEREO hParametricStereo,

    FIXP_DBL *hybridData[HYBRID_FRAMESIZE][MAX_PS_CHANNELS][2],

    UCHAR *dynBandScale, FIXP_DBL *maxBandValue, SCHAR *dmxScale);

/*------------- function definitions ----------------*/

FDK_PSENC_ERROR PSEnc_Create(HANDLE_PARAMETRIC_STEREO *phParametricStereo) {

  FDK_PSENC_ERROR error = PSENC_OK;

  HANDLE_PARAMETRIC_STEREO hParametricStereo = NULL;

  if (phParametricStereo == NULL) {

    error = PSENC_INVALID_HANDLE;

  } else {

    int i;

    if (NULL == (hParametricStereo = GetRam_ParamStereo())) {

      error = PSENC_MEMORY_ERROR;

      goto bail;

    }

    FDKmemclear(hParametricStereo, sizeof(PARAMETRIC_STEREO));

    if (PSENC_OK !=

        (error = FDKsbrEnc_CreatePSEncode(&hParametricStereo->hPsEncode))) {

      error = PSENC_MEMORY_ERROR;

      goto bail;

    }

    for (i = 0; i < MAX_PS_CHANNELS; i++) {

      if (FDKhybridAnalysisOpen(

              &hParametricStereo->fdkHybAnaFilter[i],

              hParametricStereo->__staticHybAnaStatesLF[i],

              sizeof(hParametricStereo->__staticHybAnaStatesLF[i]),

              hParametricStereo->__staticHybAnaStatesHF[i],

              sizeof(hParametricStereo->__staticHybAnaStatesHF[i])) != 0) {

        error = PSENC_MEMORY_ERROR;

        goto bail;

      }

    }

  }

bail:

  if (phParametricStereo != NULL) {

    *phParametricStereo = hParametricStereo; /* return allocated handle */

  }

  if (error != PSENC_OK) {

    PSEnc_Destroy(phParametricStereo);

  }

  return error;

}

FDK_PSENC_ERROR PSEnc_Init(HANDLE_PARAMETRIC_STEREO hParametricStereo,

                           const HANDLE_PSENC_CONFIG hPsEncConfig,

                           INT noQmfSlots, INT noQmfBands, UCHAR *dynamic_RAM) {

  FDK_PSENC_ERROR error = PSENC_OK;

  if ((NULL == hParametricStereo) || (NULL == hPsEncConfig)) {

    error = PSENC_INVALID_HANDLE;

  } else {

    int ch, i;

    hParametricStereo->initPS = 1;

    hParametricStereo->noQmfSlots = noQmfSlots;

    hParametricStereo->noQmfBands = noQmfBands;

    /* clear delay lines */

    FDKmemclear(hParametricStereo->qmfDelayLines,

                sizeof(hParametricStereo->qmfDelayLines));

    hParametricStereo->qmfDelayScale = FRACT_BITS - 1;

    /* create configuration for hybrid filter bank */

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

      FDKhybridAnalysisInit(&hParametricStereo->fdkHybAnaFilter[ch],

                            THREE_TO_TEN, 64, 64, 1);

    } /* ch */

    FDKhybridSynthesisInit(&hParametricStereo->fdkHybSynFilter, THREE_TO_TEN,

                           64, 64);

    /* determine average delay */

    hParametricStereo->psDelay =

        (HYBRID_FILTER_DELAY * hParametricStereo->noQmfBands);

    if ((hPsEncConfig->maxEnvelopes < PSENC_NENV_1) ||

        (hPsEncConfig->maxEnvelopes > PSENC_NENV_MAX)) {

      hPsEncConfig->maxEnvelopes = PSENC_NENV_DEFAULT;

    }

    hParametricStereo->maxEnvelopes = hPsEncConfig->maxEnvelopes;

    if (PSENC_OK !=

        (error = FDKsbrEnc_InitPSEncode(

             hParametricStereo->hPsEncode, (PS_BANDS)hPsEncConfig->nStereoBands,

             hPsEncConfig->iidQuantErrorThreshold))) {

      goto bail;

    }

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

      FIXP_DBL *pDynReal = GetRam_Sbr_envRBuffer(ch, dynamic_RAM);

      FIXP_DBL *pDynImag = GetRam_Sbr_envIBuffer(ch, dynamic_RAM);

      for (i = 0; i < HYBRID_FRAMESIZE; i++) {

        hParametricStereo->pHybridData[i + HYBRID_READ_OFFSET][ch][0] =

            &pDynReal[i * MAX_HYBRID_BANDS];

        hParametricStereo->pHybridData[i + HYBRID_READ_OFFSET][ch][1] =

            &pDynImag[i * MAX_HYBRID_BANDS];

        ;

      }

      for (i = 0; i < HYBRID_READ_OFFSET; i++) {

        hParametricStereo->pHybridData[i][ch][0] =

            hParametricStereo->__staticHybridData[i][ch][0];

        hParametricStereo->pHybridData[i][ch][1] =

            hParametricStereo->__staticHybridData[i][ch][1];

      }

    } /* ch */

    /* clear static hybrid buffer */

    FDKmemclear(hParametricStereo->__staticHybridData,

                sizeof(hParametricStereo->__staticHybridData));

    /* clear bs buffer */

    FDKmemclear(hParametricStereo->psOut, sizeof(hParametricStereo->psOut));

    hParametricStereo->psOut[0].enablePSHeader =

        1; /* write ps header in first frame */

    /* clear scaling buffer */

    FDKmemclear(hParametricStereo->dynBandScale, sizeof(UCHAR) * PS_MAX_BANDS);

    FDKmemclear(hParametricStereo->maxBandValue,

                sizeof(FIXP_DBL) * PS_MAX_BANDS);

  } /* valid handle */

bail:

  return error;

}

FDK_PSENC_ERROR PSEnc_Destroy(HANDLE_PARAMETRIC_STEREO *phParametricStereo) {

  FDK_PSENC_ERROR error = PSENC_OK;

  if (NULL != phParametricStereo) {

    HANDLE_PARAMETRIC_STEREO hParametricStereo = *phParametricStereo;

    if (hParametricStereo != NULL) {

      FDKsbrEnc_DestroyPSEncode(&hParametricStereo->hPsEncode);

      FreeRam_ParamStereo(phParametricStereo);

    }

  }

  return error;

}

static FDK_PSENC_ERROR ExtractPSParameters(

    HANDLE_PARAMETRIC_STEREO hParametricStereo, const int sendHeader,

    FIXP_DBL *hybridData[HYBRID_FRAMESIZE][MAX_PS_CHANNELS][2]) {

  FDK_PSENC_ERROR error = PSENC_OK;

  if (hParametricStereo == NULL) {

    error = PSENC_INVALID_HANDLE;

  } else {

    /* call ps encode function */

    if (hParametricStereo->initPS) {

      hParametricStereo->psOut[1] = hParametricStereo->psOut[0];

    }

    hParametricStereo->psOut[0] = hParametricStereo->psOut[1];

    if (PSENC_OK !=

        (error = FDKsbrEnc_PSEncode(

             hParametricStereo->hPsEncode, &hParametricStereo->psOut[1],

             hParametricStereo->dynBandScale, hParametricStereo->maxEnvelopes,

             hybridData, hParametricStereo->noQmfSlots, sendHeader))) {

      goto bail;

    }

    if (hParametricStereo->initPS) {

      hParametricStereo->psOut[0] = hParametricStereo->psOut[1];

      hParametricStereo->initPS = 0;

    }

  }

bail:

  return error;

}

static FDK_PSENC_ERROR DownmixPSQmfData(

    HANDLE_PARAMETRIC_STEREO hParametricStereo,

    HANDLE_QMF_FILTER_BANK sbrSynthQmf, FIXP_DBL **RESTRICT mixRealQmfData,

    FIXP_DBL **RESTRICT mixImagQmfData, INT_PCM *downsampledOutSignal,

    const UINT downsampledOutSignalBufSize,

    FIXP_DBL *hybridData[HYBRID_FRAMESIZE][MAX_PS_CHANNELS][2],

    const INT noQmfSlots, const INT psQmfScale[MAX_PS_CHANNELS],

    SCHAR *qmfScale) {

  FDK_PSENC_ERROR error = PSENC_OK;

  if (hParametricStereo == NULL) {

    error = PSENC_INVALID_HANDLE;

  } else {

    int n, k;

    C_AALLOC_SCRATCH_START(pWorkBuffer, FIXP_DBL, 2 * 64)

    /* define scalings */

    int dynQmfScale = fixMax(

        0, hParametricStereo->dmxScale -

               1); /* scale one bit more for addition of left and right */

    int downmixScale = psQmfScale[0] - dynQmfScale;

    const FIXP_DBL maxStereoScaleFactor = MAXVAL_DBL; /* 2.f/2.f */

    for (n = 0; n < noQmfSlots; n++) {

      FIXP_DBL tmpHybrid[2][MAX_HYBRID_BANDS];

      for (k = 0; k < 71; k++) {

        int dynScale, sc; /* scaling */

        FIXP_DBL tmpLeftReal, tmpRightReal, tmpLeftImag, tmpRightImag;

        FIXP_DBL tmpScaleFactor, stereoScaleFactor;

        tmpLeftReal = hybridData[n][0][0][k];

        tmpLeftImag = hybridData[n][0][1][k];

        tmpRightReal = hybridData[n][1][0][k];

        tmpRightImag = hybridData[n][1][1][k];

        sc = fixMax(

            0, CntLeadingZeros(fixMax(

                   fixMax(fixp_abs(tmpLeftReal), fixp_abs(tmpLeftImag)),

                   fixMax(fixp_abs(tmpRightReal), fixp_abs(tmpRightImag)))) -

                   2);

        tmpLeftReal <<= sc;

        tmpLeftImag <<= sc;

        tmpRightReal <<= sc;

        tmpRightImag <<= sc;

        dynScale = fixMin(sc - dynQmfScale, DFRACT_BITS - 1);

        /* calc stereo scale factor to avoid loss of energy in bands */

        /* stereo scale factor = min(2.0f, sqrt( (abs(l(k, n)^2 + abs(r(k, n)^2

         * )))/(0.5f*abs(l(k, n) + r(k, n))) )) */

        stereoScaleFactor = fPow2Div2(tmpLeftReal) + fPow2Div2(tmpLeftImag) +

                            fPow2Div2(tmpRightReal) + fPow2Div2(tmpRightImag);

        /* might be that tmpScaleFactor becomes negative, so fabs(.) */

        tmpScaleFactor =

            fixp_abs(stereoScaleFactor + fMult(tmpLeftReal, tmpRightReal) +

                     fMult(tmpLeftImag, tmpRightImag));

        /* min(2.0f, sqrt(stereoScaleFactor/(0.5f*tmpScaleFactor)))  */

        if ((stereoScaleFactor >> 1) <

            fMult(maxStereoScaleFactor, tmpScaleFactor)) {

          int sc_num = CountLeadingBits(stereoScaleFactor);

          int sc_denum = CountLeadingBits(tmpScaleFactor);

          sc = -(sc_num - sc_denum);

          tmpScaleFactor = schur_div((stereoScaleFactor << (sc_num)) >> 1,

                                     tmpScaleFactor << sc_denum, 16);

          /* prevent odd scaling for next sqrt calculation */

          if (sc & 0x1) {

            sc++;

            tmpScaleFactor >>= 1;

          }

          stereoScaleFactor = sqrtFixp(tmpScaleFactor);

          stereoScaleFactor <<= (sc >> 1);

        } else {

          stereoScaleFactor = maxStereoScaleFactor;

        }

        /* write data to hybrid output */

        tmpHybrid[0][k] = fMultDiv2(stereoScaleFactor,

                                    (FIXP_DBL)(tmpLeftReal + tmpRightReal)) >>

                          dynScale;

        tmpHybrid[1][k] = fMultDiv2(stereoScaleFactor,

                                    (FIXP_DBL)(tmpLeftImag + tmpRightImag)) >>

                          dynScale;

      } /* hybrid bands - k */

      FDKhybridSynthesisApply(&hParametricStereo->fdkHybSynFilter, tmpHybrid[0],

                              tmpHybrid[1], mixRealQmfData[n],

                              mixImagQmfData[n]);

      qmfSynthesisFilteringSlot(

          sbrSynthQmf, mixRealQmfData[n], mixImagQmfData[n], downmixScale - 7,

          downmixScale - 7,

          downsampledOutSignal + (n * sbrSynthQmf->no_channels), 1,

          pWorkBuffer);

    } /* slots */

    *qmfScale = -downmixScale + 7;

    C_AALLOC_SCRATCH_END(pWorkBuffer, FIXP_DBL, 2 * 64)

    {

      const INT noQmfSlots2 = hParametricStereo->noQmfSlots >> 1;

      const int noQmfBands = hParametricStereo->noQmfBands;

      INT scale, i, j, slotOffset;

      FIXP_DBL tmp[2][64];

      for (i = 0; i < noQmfSlots2; i++) {

        FDKmemcpy(tmp[0], hParametricStereo->qmfDelayLines[0][i],

                  noQmfBands * sizeof(FIXP_DBL));

        FDKmemcpy(tmp[1], hParametricStereo->qmfDelayLines[1][i],

                  noQmfBands * sizeof(FIXP_DBL));

        FDKmemcpy(hParametricStereo->qmfDelayLines[0][i],

                  mixRealQmfData[i + noQmfSlots2],

                  noQmfBands * sizeof(FIXP_DBL));

        FDKmemcpy(hParametricStereo->qmfDelayLines[1][i],

                  mixImagQmfData[i + noQmfSlots2],

                  noQmfBands * sizeof(FIXP_DBL));

        FDKmemcpy(mixRealQmfData[i + noQmfSlots2], mixRealQmfData[i],

                  noQmfBands * sizeof(FIXP_DBL));

        FDKmemcpy(mixImagQmfData[i + noQmfSlots2], mixImagQmfData[i],

                  noQmfBands * sizeof(FIXP_DBL));

        FDKmemcpy(mixRealQmfData[i], tmp[0], noQmfBands * sizeof(FIXP_DBL));

        FDKmemcpy(mixImagQmfData[i], tmp[1], noQmfBands * sizeof(FIXP_DBL));

      }

      if (hParametricStereo->qmfDelayScale > *qmfScale) {

        scale = hParametricStereo->qmfDelayScale - *qmfScale;

        slotOffset = 0;

      } else {

        scale = *qmfScale - hParametricStereo->qmfDelayScale;

        slotOffset = noQmfSlots2;

      }

      for (i = 0; i < noQmfSlots2; i++) {

        for (j = 0; j < noQmfBands; j++) {

          mixRealQmfData[i + slotOffset][j] >>= scale;

          mixImagQmfData[i + slotOffset][j] >>= scale;

        }

      }

      scale = *qmfScale;

      *qmfScale = fMin(*qmfScale, hParametricStereo->qmfDelayScale);

      hParametricStereo->qmfDelayScale = scale;

    }

  } /* valid handle */

  return error;

}

INT FDKsbrEnc_PSEnc_WritePSData(HANDLE_PARAMETRIC_STEREO hParametricStereo,

                                HANDLE_FDK_BITSTREAM hBitstream) {

  return (

      (hParametricStereo != NULL)

          ? FDKsbrEnc_WritePSBitstream(&hParametricStereo->psOut[0], hBitstream)

          : 0);

}

FDK_PSENC_ERROR FDKsbrEnc_PSEnc_ParametricStereoProcessing(

    HANDLE_PARAMETRIC_STEREO hParametricStereo, INT_PCM *samples[2],

    UINT samplesBufSize, QMF_FILTER_BANK **hQmfAnalysis,

    FIXP_DBL **RESTRICT downmixedRealQmfData,

    FIXP_DBL **RESTRICT downmixedImagQmfData, INT_PCM *downsampledOutSignal,

    HANDLE_QMF_FILTER_BANK sbrSynthQmf, SCHAR *qmfScale, const int sendHeader) {

  FDK_PSENC_ERROR error = PSENC_OK;

  INT psQmfScale[MAX_PS_CHANNELS] = {0};

  int psCh, i;

  C_AALLOC_SCRATCH_START(pWorkBuffer, FIXP_DBL, 4 * 64)

  for (psCh = 0; psCh < MAX_PS_CHANNELS; psCh++) {

    for (i = 0; i < hQmfAnalysis[psCh]->no_col; i++) {

      qmfAnalysisFilteringSlot(

          hQmfAnalysis[psCh], &pWorkBuffer[2 * 64], /* qmfReal[64] */

          &pWorkBuffer[3 * 64],                     /* qmfImag[64] */

          samples[psCh] + i * hQmfAnalysis[psCh]->no_channels, 1,

          &pWorkBuffer[0 * 64] /* qmf workbuffer 2*64 */

      );

      FDKhybridAnalysisApply(

          &hParametricStereo->fdkHybAnaFilter[psCh],

          &pWorkBuffer[2 * 64], /* qmfReal[64] */

          &pWorkBuffer[3 * 64], /* qmfImag[64] */

          hParametricStereo->pHybridData[i + HYBRID_READ_OFFSET][psCh][0],

          hParametricStereo->pHybridData[i + HYBRID_READ_OFFSET][psCh][1]);

    } /* no_col loop  i  */

    psQmfScale[psCh] = hQmfAnalysis[psCh]->outScalefactor;

  } /* for psCh */

  C_AALLOC_SCRATCH_END(pWorkBuffer, FIXP_DBL, 4 * 64)

  /* find best scaling in new QMF and Hybrid data */

  psFindBestScaling(

      hParametricStereo, &hParametricStereo->pHybridData[HYBRID_READ_OFFSET],

      hParametricStereo->dynBandScale, hParametricStereo->maxBandValue,

      &hParametricStereo->dmxScale);

  /* extract the ps parameters */

  if (PSENC_OK !=

      (error = ExtractPSParameters(hParametricStereo, sendHeader,

                                   &hParametricStereo->pHybridData[0]))) {

    goto bail;

  }

  /* save hybrid date for next frame */

  for (i = 0; i < HYBRID_READ_OFFSET; i++) {

    FDKmemcpy(

        hParametricStereo->pHybridData[i][0][0],

        hParametricStereo->pHybridData[hParametricStereo->noQmfSlots + i][0][0],

        MAX_HYBRID_BANDS * sizeof(FIXP_DBL)); /* left, real */

    FDKmemcpy(

        hParametricStereo->pHybridData[i][0][1],

        hParametricStereo->pHybridData[hParametricStereo->noQmfSlots + i][0][1],

        MAX_HYBRID_BANDS * sizeof(FIXP_DBL)); /* left, imag */

    FDKmemcpy(

        hParametricStereo->pHybridData[i][1][0],

        hParametricStereo->pHybridData[hParametricStereo->noQmfSlots + i][1][0],

        MAX_HYBRID_BANDS * sizeof(FIXP_DBL)); /* right, real */

    FDKmemcpy(

        hParametricStereo->pHybridData[i][1][1],

        hParametricStereo->pHybridData[hParametricStereo->noQmfSlots + i][1][1],

        MAX_HYBRID_BANDS * sizeof(FIXP_DBL)); /* right, imag */

  }

  /* downmix and hybrid synthesis */

  if (PSENC_OK !=

      (error = DownmixPSQmfData(

           hParametricStereo, sbrSynthQmf, downmixedRealQmfData,

           downmixedImagQmfData, downsampledOutSignal, samplesBufSize,

           &hParametricStereo->pHybridData[HYBRID_READ_OFFSET],

           hParametricStereo->noQmfSlots, psQmfScale, qmfScale))) {

    goto bail;

  }

bail:

  return error;

}

static void psFindBestScaling(

    HANDLE_PARAMETRIC_STEREO hParametricStereo,

    FIXP_DBL *hybridData[HYBRID_FRAMESIZE][MAX_PS_CHANNELS][2],

    UCHAR *dynBandScale, FIXP_DBL *maxBandValue, SCHAR *dmxScale) {

  HANDLE_PS_ENCODE hPsEncode = hParametricStereo->hPsEncode;

  INT group, bin, col, band;

  const INT frameSize = hParametricStereo->noQmfSlots;

  const INT psBands = (INT)hPsEncode->psEncMode;

  const INT nIidGroups = hPsEncode->nQmfIidGroups + hPsEncode->nSubQmfIidGroups;

  /* group wise scaling */

  FIXP_DBL maxVal[2][PS_MAX_BANDS];

  FIXP_DBL maxValue = FL2FXCONST_DBL(0.f);

  FDKmemclear(maxVal, sizeof(maxVal));

  /* start with hybrid data */

  for (group = 0; group < nIidGroups; group++) {

    /* Translate group to bin */

    bin = hPsEncode->subband2parameterIndex[group];

    /* Translate from 20 bins to 10 bins */

    if (hPsEncode->psEncMode == PS_BANDS_COARSE) {

      bin >>= 1;

    }

    /* QMF downmix scaling */

    for (col = 0; col < frameSize; col++) {

      int i, section = (col < frameSize - HYBRID_READ_OFFSET) ? 0 : 1;

      FIXP_DBL tmp = maxVal[section][bin];

      for (i = hPsEncode->iidGroupBorders[group];

           i < hPsEncode->iidGroupBorders[group + 1]; i++) {

        tmp = fixMax(tmp, (FIXP_DBL)fixp_abs(hybridData[col][0][0][i]));

        tmp = fixMax(tmp, (FIXP_DBL)fixp_abs(hybridData[col][0][1][i]));

        tmp = fixMax(tmp, (FIXP_DBL)fixp_abs(hybridData[col][1][0][i]));

        tmp = fixMax(tmp, (FIXP_DBL)fixp_abs(hybridData[col][1][1][i]));

      }

      maxVal[section][bin] = tmp;

    }

  } /* nIidGroups */

  /* convert maxSpec to maxScaling, find scaling space */

  for (band = 0; band < psBands; band++) {

#ifndef MULT_16x16

    dynBandScale[band] =

        CountLeadingBits(fixMax(maxVal[0][band], maxBandValue[band]));

#else

    dynBandScale[band] = fixMax(

        0, CountLeadingBits(fixMax(maxVal[0][band], maxBandValue[band])) -

               FRACT_BITS);

#endif

    maxValue = fixMax(maxValue, fixMax(maxVal[0][band], maxVal[1][band]));

    maxBandValue[band] = fixMax(maxVal[0][band], maxVal[1][band]);

  }

    /* calculate maximal scaling for QMF downmix */

#ifndef MULT_16x16

  *dmxScale = fixMin(DFRACT_BITS, CountLeadingBits(maxValue));

#else

  *dmxScale = fixMax(0, fixMin(FRACT_BITS, CountLeadingBits((maxValue))));

#endif

}