libSBRdec/src/sbrdecoder.cpp

/* -----------------------------------------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android

 Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Frderung der angewandten Forschung e.V.
  All rights reserved.

 1.    INTRODUCTION
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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
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of the MPEG specifications.

Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
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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 (at) iis.fraunhofer.de
----------------------------------------------------------------------------------------------------------- */

/*!
  \file
  \brief  SBR decoder frontend
  This module provides a frontend to the SBR decoder. The function openSBR() is called for
  initialization. The function sbrDecoder_Apply() is called for each frame. sbr_Apply() will call the
  required functions to decode the raw SBR data (provided by env_extr.cpp), to decode the envelope data and noise floor levels [decodeSbrData()],
  and to finally apply SBR to the current frame [sbr_dec()].

  \sa sbrDecoder_Apply(), \ref documentationOverview
*/

/*!
  \page documentationOverview Overview of important information resources and source code documentation

  The primary source code documentation is based on generated and cross-referenced HTML files using
  <a HREF="http://www.doxygen.org">doxygen</a>. As part of this documentation
  you can find more extensive descriptions about key concepts and algorithms at the following locations:

  <h2>Programming</h2>

  \li Buffer management: sbrDecoder_Apply() and sbr_dec()
  \li Internal scale factors to maximize SNR on fixed point processors: #QMF_SCALE_FACTOR
  \li Special mantissa-exponent format: Created in requantizeEnvelopeData() and used in calculateSbrEnvelope()

  <h2>Algorithmic details</h2>
  \li About the SBR data format: \ref SBR_HEADER_ELEMENT and \ref SBR_STANDARD_ELEMENT
  \li Details about the bitstream decoder: env_extr.cpp
  \li Details about the QMF filterbank and the provided polyphase implementation: qmf_dec.cpp
  \li Details about the transposer: lpp_tran.cpp
  \li Details about the envelope adjuster: env_calc.cpp

*/

#include "sbrdecoder.h"

#include "FDK_bitstream.h"

#include "sbrdec_freq_sca.h"
#include "env_extr.h"
#include "sbr_dec.h"
#include "env_dec.h"
#include "sbr_crc.h"
#include "sbr_ram.h"
#include "sbr_rom.h"
#include "lpp_tran.h"
#include "transcendent.h"


#include "sbrdec_drc.h"

#include "psbitdec.h"


/* Decoder library info */
#define SBRDECODER_LIB_VL0 2
#define SBRDECODER_LIB_VL1 2
#define SBRDECODER_LIB_VL2 3
#define SBRDECODER_LIB_TITLE "SBR Decoder"
#define SBRDECODER_LIB_BUILD_DATE __DATE__
#define SBRDECODER_LIB_BUILD_TIME __TIME__


static UCHAR getHeaderSlot( UCHAR currentSlot, UCHAR hdrSlotUsage[(1)+1] )
{
  UINT  occupied = 0;
  int   s;
  UCHAR slot = hdrSlotUsage[currentSlot];

  FDK_ASSERT((1)+1 < 32);

  for (s = 0; s < (1)+1; s++) {
    if ( (hdrSlotUsage[s] == slot)
      && (s != slot) ) {
      occupied = 1;
      break;
    }
  }

  if (occupied) {
    occupied = 0;

    for (s = 0; s < (1)+1; s++) {
      occupied |= 1 << hdrSlotUsage[s];
    }
    for (s = 0; s < (1)+1; s++) {
      if ( !(occupied & 0x1) ) {
        slot = s;
        break;
      }
      occupied >>= 1;
    }
  }

  return slot;
}

static void copySbrHeader( HANDLE_SBR_HEADER_DATA hDst, const HANDLE_SBR_HEADER_DATA hSrc )
{
  /* copy the whole header memory (including pointers) */
  FDKmemcpy( hDst, hSrc, sizeof(SBR_HEADER_DATA) );

  /* update pointers */
  hDst->freqBandData.freqBandTable[0]  = hDst->freqBandData.freqBandTableLo;
  hDst->freqBandData.freqBandTable[1] = hDst->freqBandData.freqBandTableHi;
}


/*!
  \brief Reset SBR decoder.

  Reset should only be called if SBR has been sucessfully detected by
  an appropriate checkForPayload() function.

  \return Error code.
*/
static
SBR_ERROR sbrDecoder_ResetElement (
        HANDLE_SBRDECODER    self,
        int                  sampleRateIn,
        int                  sampleRateOut,
        int                  samplesPerFrame,
        const MP4_ELEMENT_ID elementID,
        const int            elementIndex,
        const int            overlap
        )
{
  SBR_ERROR sbrError = SBRDEC_OK;
  HANDLE_SBR_HEADER_DATA hSbrHeader;
  UINT qmfFlags = 0;

  int i, synDownsampleFac;

  /* Check in/out samplerates */
  if ( sampleRateIn < 6400
    || sampleRateIn > 48000
     )
  {
    sbrError = SBRDEC_UNSUPPORTED_CONFIG;
    goto bail;
  }

  if ( sampleRateOut > 96000 )
  {
    sbrError = SBRDEC_UNSUPPORTED_CONFIG;
    goto bail;
  }

  /* Set QMF mode flags */
  if (self->flags & SBRDEC_LOW_POWER)
    qmfFlags |= QMF_FLAG_LP;

  if (self->coreCodec == AOT_ER_AAC_ELD) {
    if (self->flags & SBRDEC_LD_MPS_QMF) {
      qmfFlags |=  QMF_FLAG_MPSLDFB;
    } else {
      qmfFlags |=  QMF_FLAG_CLDFB;
    }
  }

  /* Set downsampling factor for synthesis filter bank */
  if (sampleRateOut == 0)
  {
    /* no single rate mode */
      sampleRateOut = sampleRateIn<<1; /* In case of implicit signalling, assume dual rate SBR */
  }

  if ( sampleRateIn == sampleRateOut ) {
    synDownsampleFac = 2;
  } else {
    synDownsampleFac = 1;
  }

  self->synDownsampleFac = synDownsampleFac;
  self->sampleRateOut = sampleRateOut;

  {
    int i;

    for (i = 0; i < (1)+1; i++)
    {
      hSbrHeader = &(self->sbrHeader[elementIndex][i]);

      /* init a default header such that we can at least do upsampling later */
      sbrError = initHeaderData(
              hSbrHeader,
              sampleRateIn,
              sampleRateOut,
              samplesPerFrame,
              self->flags
              );
    }
  }

  if (sbrError != SBRDEC_OK) {
    goto bail;
  }

  /* Init SBR channels going to be assigned to a SBR element */
  {
    int ch;

    for (ch=0; ch<self->pSbrElement[elementIndex]->nChannels; ch++)
    {
      /* and create sbrDec */
      sbrError = createSbrDec (self->pSbrElement[elementIndex]->pSbrChannel[ch],
                          hSbrHeader,
                         &self->pSbrElement[elementIndex]->transposerSettings,
                          synDownsampleFac,
                          qmfFlags,
                          self->flags,
                          overlap,
                          ch );

      if (sbrError != SBRDEC_OK) {
        goto bail;
      }
    }
  }

  //FDKmemclear(sbr_OverlapBuffer, sizeof(sbr_OverlapBuffer));

  if (self->numSbrElements == 1) {
    switch ( self->coreCodec ) {
    case AOT_AAC_LC:
    case AOT_SBR:
    case AOT_PS:
    case AOT_ER_AAC_SCAL:
    case AOT_DRM_AAC:
    case AOT_DRM_SURROUND:
      if (CreatePsDec ( &self->hParametricStereoDec, samplesPerFrame )) {
        sbrError = SBRDEC_CREATE_ERROR;
        goto bail;
      }
      break;
    default:
      break;
    }
  }

  /* Init frame delay slot handling */
  self->pSbrElement[elementIndex]->useFrameSlot = 0;
  for (i = 0; i < ((1)+1); i++) {
    self->pSbrElement[elementIndex]->useHeaderSlot[i] = i;
  }

bail:

  return sbrError;
}


SBR_ERROR sbrDecoder_Open ( HANDLE_SBRDECODER  * pSelf )
{
  HANDLE_SBRDECODER    self = NULL;
  SBR_ERROR sbrError = SBRDEC_OK;

  /* Get memory for this instance */
  self = GetRam_SbrDecoder();
  if (self == NULL) {
    sbrError = SBRDEC_MEM_ALLOC_FAILED;
    goto bail;
  }

  self->workBuffer1 = GetRam_SbrDecWorkBuffer1();
  self->workBuffer2 = GetRam_SbrDecWorkBuffer2();

  if (  self->workBuffer1 == NULL
     || self->workBuffer2 == NULL )
  {
    sbrError = SBRDEC_MEM_ALLOC_FAILED;
    goto bail;
  }

  /*
  Already zero because of calloc
  self->numSbrElements = 0;
  self->numSbrChannels = 0;
  self->codecFrameSize = 0;
  */

  self->numDelayFrames = (1);  /* set to the max value by default */

  *pSelf = self;

bail:
  return sbrError;
}

/**
 * \brief determine if the given core codec AOT can be processed or not.
 * \param coreCodec core codec audio object type.
 * \return 1 if SBR can be processed, 0 if SBR cannot be processed/applied.
 */
static
int sbrDecoder_isCoreCodecValid(AUDIO_OBJECT_TYPE coreCodec)
{
  switch (coreCodec) {
    case AOT_AAC_LC:
    case AOT_SBR:
    case AOT_PS:
    case AOT_ER_AAC_SCAL:
    case AOT_ER_AAC_ELD:
      return 1;
    default:
      return 0;
  }
}

static
void sbrDecoder_DestroyElement (
        HANDLE_SBRDECODER       self,
        const int               elementIndex
        )
{
  if (self->pSbrElement[elementIndex] != NULL) {
    int ch;

    for (ch=0; ch<SBRDEC_MAX_CH_PER_ELEMENT; ch++) {
      if (self->pSbrElement[elementIndex]->pSbrChannel[ch] != NULL) {
        deleteSbrDec( self->pSbrElement[elementIndex]->pSbrChannel[ch] );
        FreeRam_SbrDecChannel( &self->pSbrElement[elementIndex]->pSbrChannel[ch] );
        self->numSbrChannels -= 1;
      }
    }
    FreeRam_SbrDecElement( &self->pSbrElement[elementIndex] );
    self->numSbrElements -= 1;
  }
}


SBR_ERROR sbrDecoder_InitElement (
        HANDLE_SBRDECODER       self,
        const int               sampleRateIn,
        const int               sampleRateOut,
        const int               samplesPerFrame,
        const AUDIO_OBJECT_TYPE coreCodec,
        const MP4_ELEMENT_ID    elementID,
        const int               elementIndex
        )
{
  SBR_ERROR sbrError = SBRDEC_OK;
  int chCnt=0;
  int nSbrElementsStart = self->numSbrElements;

  /* Check core codec AOT */
  if (! sbrDecoder_isCoreCodecValid(coreCodec) || elementIndex >= (4)) {
    sbrError = SBRDEC_UNSUPPORTED_CONFIG;
    goto bail;
  }

  if ( elementID != ID_SCE && elementID != ID_CPE && elementID != ID_LFE )
  {
    sbrError = SBRDEC_UNSUPPORTED_CONFIG;
    goto bail;
  }

  if (  self->sampleRateIn == sampleRateIn
     && self->codecFrameSize == samplesPerFrame
     && self->coreCodec == coreCodec
     && self->pSbrElement[elementIndex] != NULL
     && self->pSbrElement[elementIndex]->elementID == elementID
     )
  {
     /* Nothing to do */
     return SBRDEC_OK;
  }

  self->sampleRateIn = sampleRateIn;
  self->codecFrameSize = samplesPerFrame;
  self->coreCodec = coreCodec;

  self->flags = 0;
  self->flags |= (coreCodec == AOT_ER_AAC_ELD) ? SBRDEC_ELD_GRID : 0;

  /* Init SBR elements */
  {
    int elChannels, ch;

    if (self->pSbrElement[elementIndex] == NULL) {
      self->pSbrElement[elementIndex] = GetRam_SbrDecElement(elementIndex);
      if (self->pSbrElement[elementIndex] == NULL) {
        sbrError = SBRDEC_MEM_ALLOC_FAILED;
        goto bail;
      }
      self->numSbrElements ++;
    } else {
      self->numSbrChannels -= self->pSbrElement[elementIndex]->nChannels;
    }

    /* Save element ID for sanity checks and to have a fallback for concealment. */
    self->pSbrElement[elementIndex]->elementID = elementID;

    /* Determine amount of channels for this element */
    switch (elementID) {
      case ID_NONE:
      case ID_CPE: elChannels=2;
        break;
      case ID_LFE:
      case ID_SCE: elChannels=1;
        break;
      default: elChannels=0;
        break;
    }

    /* Handle case of Parametric Stereo */
    if ( elementIndex == 0 && elementID == ID_SCE ) {
      switch (coreCodec) {
        case AOT_AAC_LC:
        case AOT_SBR:
        case AOT_PS:
        case AOT_ER_AAC_SCAL:
        case AOT_DRM_AAC:
        case AOT_DRM_SURROUND:
          elChannels = 2;
          break;
        default:
          break;
      }
    }

    self->pSbrElement[elementIndex]->nChannels = elChannels;

    for (ch=0; ch<elChannels; ch++)
    {
      if (self->pSbrElement[elementIndex]->pSbrChannel[ch] == NULL) {
        self->pSbrElement[elementIndex]->pSbrChannel[ch] = GetRam_SbrDecChannel(chCnt);
        if (self->pSbrElement[elementIndex]->pSbrChannel[ch] == NULL) {
          sbrError = SBRDEC_MEM_ALLOC_FAILED;
          goto bail;
        }
      }
      self->numSbrChannels ++;

      sbrDecoder_drcInitChannel( &self->pSbrElement[elementIndex]->pSbrChannel[ch]->SbrDec.sbrDrcChannel );

      /* Add reference pointer to workbuffers. */
      self->pSbrElement[elementIndex]->pSbrChannel[ch]->SbrDec.WorkBuffer1 = self->workBuffer1;
      self->pSbrElement[elementIndex]->pSbrChannel[ch]->SbrDec.WorkBuffer2 = self->workBuffer2;
      chCnt++;
    }
    if (elChannels == 1 && self->pSbrElement[elementIndex]->pSbrChannel[ch] != NULL) {
      deleteSbrDec( self->pSbrElement[elementIndex]->pSbrChannel[ch] );
      FreeRam_SbrDecChannel( &self->pSbrElement[elementIndex]->pSbrChannel[ch] );
    }
  }

  /* clear error flags for all delay slots */
  FDKmemclear(self->pSbrElement[elementIndex]->frameErrorFlag, ((1)+1)*sizeof(UCHAR));

  /* Initialize this instance */
  sbrError = sbrDecoder_ResetElement(
          self,
          sampleRateIn,
          sampleRateOut,
          samplesPerFrame,
          elementID,
          elementIndex,
          (coreCodec == AOT_ER_AAC_ELD) ? 0 : (6)
          );


bail:
  if (sbrError != SBRDEC_OK) {
    if (nSbrElementsStart < self->numSbrElements) {
      /* Free the memory allocated for this element */
      sbrDecoder_DestroyElement( self, elementIndex );
    } else if (self->pSbrElement[elementIndex] != NULL) {
      /* Set error flag to trigger concealment */
      self->pSbrElement[elementIndex]->frameErrorFlag[self->pSbrElement[elementIndex]->useFrameSlot] = 1;
    }
  }

  return sbrError;
}

/**
 * \brief Apply decoded SBR header for one element.
 * \param self SBR decoder instance handle
 * \param hSbrHeader SBR header handle to be processed.
 * \param hSbrChannel pointer array to the SBR element channels corresponding to the SBR header.
 * \param headerStatus header status value returned from SBR header parser.
 * \param numElementChannels amount of channels for the SBR element whos header is to be processed.
 */
static
SBR_ERROR sbrDecoder_HeaderUpdate(
        HANDLE_SBRDECODER self,
        HANDLE_SBR_HEADER_DATA hSbrHeader,
        SBR_HEADER_STATUS headerStatus,
        HANDLE_SBR_CHANNEL hSbrChannel[],
        const int numElementChannels
        )
{
  SBR_ERROR errorStatus = SBRDEC_OK;

  /*
    change of control data, reset decoder
  */
  errorStatus = resetFreqBandTables(hSbrHeader, self->flags);

  if (errorStatus == SBRDEC_OK) {
    if (hSbrHeader->syncState == UPSAMPLING && headerStatus != HEADER_RESET)
    {
      /* As the default header would limit the frequency range,
         lowSubband and highSubband must be patched. */
      hSbrHeader->freqBandData.lowSubband = hSbrHeader->numberOfAnalysisBands;
      hSbrHeader->freqBandData.highSubband = hSbrHeader->numberOfAnalysisBands;
    }

    /* Trigger a reset before processing this slot */
    hSbrHeader->status |= SBRDEC_HDR_STAT_RESET;
  }

  return errorStatus;
}

INT sbrDecoder_Header (
        HANDLE_SBRDECODER       self,
        HANDLE_FDK_BITSTREAM    hBs,
        const INT sampleRateIn,
        const INT sampleRateOut,
        const INT samplesPerFrame,
        const AUDIO_OBJECT_TYPE coreCodec,
        const MP4_ELEMENT_ID    elementID,
        const INT               elementIndex
        )
{
  SBR_HEADER_STATUS headerStatus;
  HANDLE_SBR_HEADER_DATA hSbrHeader;
  SBR_ERROR sbrError = SBRDEC_OK;
  int headerIndex;

  if ( self == NULL || elementIndex > (4) )
  {
    return SBRDEC_UNSUPPORTED_CONFIG;
  }

  if (! sbrDecoder_isCoreCodecValid(coreCodec)) {
    return SBRDEC_UNSUPPORTED_CONFIG;
  }

  sbrError = sbrDecoder_InitElement(
          self,
          sampleRateIn,
          sampleRateOut,
          samplesPerFrame,
          coreCodec,
          elementID,
          elementIndex
          );

  if (sbrError != SBRDEC_OK) {
    goto bail;
  }

  headerIndex = getHeaderSlot(self->pSbrElement[elementIndex]->useFrameSlot,
                              self->pSbrElement[elementIndex]->useHeaderSlot);
  hSbrHeader = &(self->sbrHeader[elementIndex][headerIndex]);

  headerStatus = sbrGetHeaderData ( hSbrHeader,
                                    hBs,
                                    self->flags,
                                    0);


  {
    SBR_DECODER_ELEMENT *pSbrElement;

    pSbrElement = self->pSbrElement[elementIndex];

    /* Sanity check */
    if (pSbrElement != NULL) {
      if ( (elementID == ID_CPE && pSbrElement->nChannels != 2)
        || (elementID != ID_CPE && pSbrElement->nChannels != 1) )
      {
        return SBRDEC_UNSUPPORTED_CONFIG;
      }
      if ( headerStatus == HEADER_RESET ) {

        sbrError = sbrDecoder_HeaderUpdate(
              self,
              hSbrHeader,
              headerStatus,
              pSbrElement->pSbrChannel,
              pSbrElement->nChannels
              );

        if (sbrError == SBRDEC_OK) {
          hSbrHeader->syncState = SBR_HEADER;
          hSbrHeader->status   |= SBRDEC_HDR_STAT_UPDATE;
        }
        /* else {
          Since we already have overwritten the old SBR header the only way out is UPSAMPLING!
          This will be prepared in the next step.
        } */
      }
    }
  }
bail:
  return sbrError;
}


SBR_ERROR sbrDecoder_SetParam (HANDLE_SBRDECODER   self,
                               const SBRDEC_PARAM  param,
                               const INT           value )
{
  SBR_ERROR errorStatus = SBRDEC_OK;

  /* configure the subsystems */
  switch (param)
  {
  case SBR_SYSTEM_BITSTREAM_DELAY:
    if (value < 0 || value > (1)) {
      errorStatus = SBRDEC_SET_PARAM_FAIL;
      break;
    }
    if (self == NULL) {
      errorStatus = SBRDEC_NOT_INITIALIZED;
    } else {
      self->numDelayFrames = (UCHAR)value;
    }
    break;
  case SBR_QMF_MODE:
    if (self == NULL) {
      errorStatus = SBRDEC_NOT_INITIALIZED;
    } else {
      if (value == 1) {
        self->flags |= SBRDEC_LOW_POWER;
      } else {
        self->flags &= ~SBRDEC_LOW_POWER;
      }
    }
    break;
  case SBR_LD_QMF_TIME_ALIGN:
    if (self == NULL) {
      errorStatus = SBRDEC_NOT_INITIALIZED;
    } else {
      if (value == 1) {
        self->flags |= SBRDEC_LD_MPS_QMF;
      } else {
        self->flags &= ~SBRDEC_LD_MPS_QMF;
      }
    }
    break;
  case SBR_BS_INTERRUPTION:
    {
      int elementIndex;

      if (self == NULL) {
        errorStatus = SBRDEC_NOT_INITIALIZED;
        break;
      }

      /* Loop over SBR elements */
      for (elementIndex = 0; elementIndex < self->numSbrElements; elementIndex++)
      {
        HANDLE_SBR_HEADER_DATA hSbrHeader;
        int headerIndex = getHeaderSlot(self->pSbrElement[elementIndex]->useFrameSlot,
                                        self->pSbrElement[elementIndex]->useHeaderSlot);

        hSbrHeader = &(self->sbrHeader[elementIndex][headerIndex]);

        /* Set sync state UPSAMPLING for the corresponding slot.
           This switches off bitstream parsing until a new header arrives. */
        hSbrHeader->syncState = UPSAMPLING;
        hSbrHeader->status   |= SBRDEC_HDR_STAT_UPDATE;
      }
    }
    break;
  default:
    errorStatus = SBRDEC_SET_PARAM_FAIL;
    break;
  }  /* switch(param) */

  return (errorStatus);
}

static
SBRDEC_DRC_CHANNEL * sbrDecoder_drcGetChannel( const HANDLE_SBRDECODER self, const INT channel )
{
  SBRDEC_DRC_CHANNEL *pSbrDrcChannelData = NULL;
  int elementIndex, elChanIdx=0, numCh=0;

  for (elementIndex = 0; (elementIndex < (4)) && (numCh <= channel); elementIndex++)
  {
    SBR_DECODER_ELEMENT *pSbrElement = self->pSbrElement[elementIndex];
    int c, elChannels;

    elChanIdx = 0;
    if (pSbrElement == NULL) break;

    /* Determine amount of channels for this element */
    switch (pSbrElement->elementID) {
      case ID_CPE: elChannels = 2;
        break;
      case ID_LFE:
      case ID_SCE: elChannels = 1;
        break;
      case ID_NONE:
      default: elChannels = 0;
        break;
    }

    /* Limit with actual allocated element channels */
    elChannels = FDKmin(elChannels, pSbrElement->nChannels);

    for (c = 0; (c < elChannels) && (numCh <= channel); c++) {
      if (pSbrElement->pSbrChannel[elChanIdx] != NULL) {
        numCh++;
        elChanIdx++;
      }
    }
  }
  elementIndex -= 1;
  elChanIdx -= 1;

  if (elChanIdx < 0 || elementIndex < 0) {
    return NULL;
  }

  if ( self->pSbrElement[elementIndex] != NULL ) {
    if ( self->pSbrElement[elementIndex]->pSbrChannel[elChanIdx] != NULL )
    {
      pSbrDrcChannelData = &self->pSbrElement[elementIndex]->pSbrChannel[elChanIdx]->SbrDec.sbrDrcChannel;
    }
  }

  return (pSbrDrcChannelData);
}

SBR_ERROR sbrDecoder_drcFeedChannel ( HANDLE_SBRDECODER  self,
                                      INT                ch,
                                      UINT               numBands,
                                      FIXP_DBL          *pNextFact_mag,
                                      INT                nextFact_exp,
                                      SHORT              drcInterpolationScheme,
                                      UCHAR              winSequence,
                                      USHORT            *pBandTop )
{
  SBRDEC_DRC_CHANNEL *pSbrDrcChannelData = NULL;
  int band, isValidData = 0;

  if (self == NULL) {
    return SBRDEC_NOT_INITIALIZED;
  }
  if (ch > (6) || pNextFact_mag == NULL) {
    return SBRDEC_SET_PARAM_FAIL;
  }

  /* Search for gain values different to 1.0f */
  for (band = 0; band < numBands; band += 1) {
    if ( !((pNextFact_mag[band] == FL2FXCONST_DBL(0.5))  && (nextFact_exp == 1))
      && !((pNextFact_mag[band] == (FIXP_DBL)MAXVAL_DBL) && (nextFact_exp == 0)) ) {
      isValidData = 1;
      break;
    }
  }

  /* Find the right SBR channel */
  pSbrDrcChannelData = sbrDecoder_drcGetChannel( self, ch );

  if ( pSbrDrcChannelData != NULL ) {
    if ( pSbrDrcChannelData->enable || isValidData )
  { /* Activate processing only with real and valid data */
    int i;

    pSbrDrcChannelData->enable   = 1;
    pSbrDrcChannelData->numBandsNext = numBands;

    pSbrDrcChannelData->winSequenceNext            = winSequence;
    pSbrDrcChannelData->drcInterpolationSchemeNext = drcInterpolationScheme;
    pSbrDrcChannelData->nextFact_exp               = nextFact_exp;

    for (i = 0; i < (int)numBands; i++) {
      pSbrDrcChannelData->bandTopNext[i]  = pBandTop[i];
      pSbrDrcChannelData->nextFact_mag[i] = pNextFact_mag[i];
    }
  }
  }

  return SBRDEC_OK;
}


void sbrDecoder_drcDisable ( HANDLE_SBRDECODER  self,
                             INT                ch )
{
  SBRDEC_DRC_CHANNEL *pSbrDrcChannelData = NULL;

  if ( (self == NULL)
    || (ch > (6))
    || (self->numSbrElements == 0)
    || (self->numSbrChannels == 0) ) {
    return;
  }

  /* Find the right SBR channel */
  pSbrDrcChannelData = sbrDecoder_drcGetChannel( self, ch );

  if ( pSbrDrcChannelData != NULL ) {
    sbrDecoder_drcInitChannel( pSbrDrcChannelData );
  }
}


SBR_ERROR sbrDecoder_Parse(
        HANDLE_SBRDECODER self,
        HANDLE_FDK_BITSTREAM  hBs,
        int *count,
        int  bsPayLen,
        int  crcFlag,
        MP4_ELEMENT_ID prevElement,
        int elementIndex,
        int fGlobalIndependencyFlag
        )
{
  SBR_DECODER_ELEMENT   *hSbrElement;
  HANDLE_SBR_HEADER_DATA hSbrHeader;
  HANDLE_SBR_CHANNEL    *pSbrChannel;

  SBR_FRAME_DATA *hFrameDataLeft;
  SBR_FRAME_DATA *hFrameDataRight;

  SBR_ERROR errorStatus = SBRDEC_OK;
  SBR_SYNC_STATE initialSyncState;
  SBR_HEADER_STATUS headerStatus = HEADER_NOT_PRESENT;

  INT  startPos;
  INT  CRCLen = 0;

  int  stereo;
  int  fDoDecodeSbrData = 1;

  int lastSlot, lastHdrSlot = 0, thisHdrSlot;

  /* Remember start position of  SBR element */
  startPos = FDKgetValidBits(hBs);

  /* SBR sanity checks */
  if ( self == NULL || self->pSbrElement[elementIndex] == NULL ) {
    errorStatus = SBRDEC_NOT_INITIALIZED;
    goto bail;
  }

  hSbrElement = self->pSbrElement[elementIndex];

  lastSlot    = (hSbrElement->useFrameSlot > 0) ? hSbrElement->useFrameSlot-1 : self->numDelayFrames;
  lastHdrSlot =  hSbrElement->useHeaderSlot[lastSlot];
  thisHdrSlot =  getHeaderSlot( hSbrElement->useFrameSlot, hSbrElement->useHeaderSlot );  /* Get a free header slot not used by frames not processed yet. */

  /* Assign the free slot to store a new header if there is one. */
  hSbrHeader = &self->sbrHeader[elementIndex][thisHdrSlot];

  pSbrChannel = hSbrElement->pSbrChannel;
  stereo = (hSbrElement->elementID == ID_CPE) ? 1 : 0;

  hFrameDataLeft  = &self->pSbrElement[elementIndex]->pSbrChannel[0]->frameData[hSbrElement->useFrameSlot];
  hFrameDataRight = &self->pSbrElement[elementIndex]->pSbrChannel[1]->frameData[hSbrElement->useFrameSlot];

  initialSyncState = hSbrHeader->syncState;

  /* reset PS flag; will be set after PS was found */
  self->flags &= ~SBRDEC_PS_DECODED;

  if (hSbrHeader->status & SBRDEC_HDR_STAT_UPDATE) {
    /* Got a new header from extern (e.g. from an ASC) */
    headerStatus = HEADER_OK;
    hSbrHeader->status &= ~SBRDEC_HDR_STAT_UPDATE;
  }
  else if (thisHdrSlot != lastHdrSlot) {
    /* Copy the last header into this slot otherwise the
       header compare will trigger more HEADER_RESETs than needed. */
    copySbrHeader( hSbrHeader, &self->sbrHeader[elementIndex][lastHdrSlot] );
  }

  /*
     Check if bit stream data is valid and matches the element context
  */
  if ( ((prevElement != ID_SCE) && (prevElement != ID_CPE)) || prevElement != hSbrElement->elementID) {
    /* In case of LFE we also land here, since there is no LFE SBR element (do upsampling only) */
    fDoDecodeSbrData = 0;
  }

  if (fDoDecodeSbrData)
  {
    if ((INT)FDKgetValidBits(hBs) <= 0) {
      fDoDecodeSbrData = 0;
    }
  }

  /*
     SBR CRC-check
  */
  if (fDoDecodeSbrData)
  {
    if (crcFlag == 1) {
      switch (self->coreCodec) {
      case AOT_ER_AAC_ELD:
        FDKpushFor (hBs, 10);
        /* check sbrcrc later: we don't know the payload length now */
        break;
      default:
        CRCLen = bsPayLen - 10;                     /* change: 0 => i */
        if (CRCLen < 0) {
          fDoDecodeSbrData = 0;
        } else {
          fDoDecodeSbrData = SbrCrcCheck (hBs, CRCLen);
        }
        break;
      }
    }
  } /* if (fDoDecodeSbrData) */

  /*
     Read in the header data and issue a reset if change occured
  */
  if (fDoDecodeSbrData)
  {
    int sbrHeaderPresent;

    {
      sbrHeaderPresent = FDKreadBit(hBs);
    }

    if ( sbrHeaderPresent ) {
      headerStatus = sbrGetHeaderData (hSbrHeader,
                                       hBs,
                                       self->flags,
                                       1);
    }

    if (headerStatus == HEADER_RESET)
    {
      errorStatus = sbrDecoder_HeaderUpdate(
            self,
            hSbrHeader,
            headerStatus,
            pSbrChannel,
            hSbrElement->nChannels
            );

      if (errorStatus == SBRDEC_OK) {
        hSbrHeader->syncState = SBR_HEADER;
      } else {
        hSbrHeader->syncState = SBR_NOT_INITIALIZED;
      }
    }

    if (errorStatus != SBRDEC_OK) {
      fDoDecodeSbrData = 0;
    }
  } /* if (fDoDecodeSbrData) */

  /*
    Print debugging output only if state has changed
  */

  /* read frame data */
  if ((hSbrHeader->syncState >= SBR_HEADER) && fDoDecodeSbrData) {
    int sbrFrameOk;
    /* read the SBR element data */
    if (stereo) {
      sbrFrameOk = sbrGetChannelPairElement(hSbrHeader,
                                            hFrameDataLeft,
                                            hFrameDataRight,
                                            hBs,
                                            self->flags,
                                            self->pSbrElement[elementIndex]->transposerSettings.overlap);
    }
    else {
      if (self->hParametricStereoDec != NULL) {
        /* update slot index for PS bitstream parsing */
        self->hParametricStereoDec->bsLastSlot = self->hParametricStereoDec->bsReadSlot;
        self->hParametricStereoDec->bsReadSlot = hSbrElement->useFrameSlot;
      }
      sbrFrameOk = sbrGetSingleChannelElement(hSbrHeader,
                                              hFrameDataLeft,
                                              hBs,
                                              self->hParametricStereoDec,
                                              self->flags,
                                              self->pSbrElement[elementIndex]->transposerSettings.overlap);
    }
    if (!sbrFrameOk) {
      fDoDecodeSbrData = 0;
    }
    else {
      INT valBits;

      if (bsPayLen > 0) {
        valBits = bsPayLen - ((INT)startPos - (INT)FDKgetValidBits(hBs));
      } else {
        valBits = (INT)FDKgetValidBits(hBs);
      }

      if ( crcFlag == 1 ) {
        switch (self->coreCodec) {
        case AOT_ER_AAC_ELD:
          {
            /* late crc check for eld */
            INT payloadbits = (INT)startPos - (INT)FDKgetValidBits(hBs) - startPos;
            INT crcLen      = payloadbits - 10;
            FDKpushBack(hBs, payloadbits);
            fDoDecodeSbrData      = SbrCrcCheck (hBs, crcLen);
            FDKpushFor(hBs, crcLen);
          }
          break;
        default:
          break;
        }
      }

      /* sanity check of remaining bits */
      if (valBits < 0) {
        fDoDecodeSbrData = 0;
      } else {
        switch (self->coreCodec) {
        case AOT_SBR:
        case AOT_PS:
        case AOT_AAC_LC:
          {
            /* This sanity check is only meaningful with General Audio bitstreams */
            int alignBits = valBits & 0x7;

            if (valBits > alignBits) {
              fDoDecodeSbrData = 0;
            }
          }
          break;
        default:
          /* No sanity check available */
          break;
        }
      }
    }
  }

  if (!fDoDecodeSbrData) {
    /* Set error flag for this slot to trigger concealment */
    self->pSbrElement[elementIndex]->frameErrorFlag[hSbrElement->useFrameSlot] = 1;
    errorStatus = SBRDEC_PARSE_ERROR;
  } else {
    /* Everything seems to be ok so clear the error flag */
    self->pSbrElement[elementIndex]->frameErrorFlag[hSbrElement->useFrameSlot] = 0;
  }

  if (!stereo) {
    /* Turn coupling off explicitely to avoid access to absent right frame data
       that might occur with corrupt bitstreams. */
    hFrameDataLeft->coupling = COUPLING_OFF;
  }

bail:
  if (errorStatus == SBRDEC_OK) {
    if (headerStatus == HEADER_NOT_PRESENT) {
      /* Use the old header for this frame */
      hSbrElement->useHeaderSlot[hSbrElement->useFrameSlot] = lastHdrSlot;
    } else {
      /* Use the new header for this frame */
      hSbrElement->useHeaderSlot[hSbrElement->useFrameSlot] = thisHdrSlot;
    }

    /* Move frame pointer to the next slot which is up to be decoded/applied next */
    hSbrElement->useFrameSlot = (hSbrElement->useFrameSlot+1) % (self->numDelayFrames+1);
  }

  *count -= startPos - FDKgetValidBits(hBs);

  return errorStatus;
}


/**
 * \brief Render one SBR element into time domain signal.
 * \param self SBR decoder handle
 * \param timeData pointer to output buffer
 * \param interleaved flag indicating interleaved channel output
 * \param channelMapping pointer to UCHAR array where next 2 channel offsets are stored.
 * \param elementIndex enumerating index of the SBR element to render.
 * \param numInChannels number of channels from core coder (reading stride).
 * \param numOutChannels pointer to a location to return number of output channels.
 * \param psPossible flag indicating if PS is possible or not.
 * \return SBRDEC_OK if successfull, else error code
 */
static SBR_ERROR
sbrDecoder_DecodeElement (
        HANDLE_SBRDECODER    self,
        INT_PCM             *timeData,
        const int            interleaved,
        const UCHAR         *channelMapping,
        const int            elementIndex,
        const int            numInChannels,
        int                 *numOutChannels,
        const int            psPossible
        )
{
  SBR_DECODER_ELEMENT *hSbrElement = self->pSbrElement[elementIndex];
  HANDLE_SBR_CHANNEL    *pSbrChannel = self->pSbrElement[elementIndex]->pSbrChannel;
  HANDLE_SBR_HEADER_DATA hSbrHeader = &self->sbrHeader[elementIndex][hSbrElement->useHeaderSlot[hSbrElement->useFrameSlot]];
  HANDLE_PS_DEC h_ps_d = self->hParametricStereoDec;

  /* get memory for frame data from scratch */
  SBR_FRAME_DATA *hFrameDataLeft  = &hSbrElement->pSbrChannel[0]->frameData[hSbrElement->useFrameSlot];
  SBR_FRAME_DATA *hFrameDataRight = &hSbrElement->pSbrChannel[1]->frameData[hSbrElement->useFrameSlot];

  SBR_ERROR errorStatus = SBRDEC_OK;


  INT  strideIn, strideOut, offset0, offset1;
  INT  codecFrameSize = self->codecFrameSize;

  int  stereo = (hSbrElement->elementID == ID_CPE) ? 1 : 0;
  int  numElementChannels = hSbrElement->nChannels; /* Number of channels of the current SBR element */

  /* Update the header error flag */
  hSbrHeader->frameErrorFlag = hSbrElement->frameErrorFlag[hSbrElement->useFrameSlot];

  /*
     Prepare filterbank for upsampling if no valid bit stream data is available.
   */
  if ( hSbrHeader->syncState == SBR_NOT_INITIALIZED )
  {
    errorStatus = initHeaderData(
            hSbrHeader,
            self->sampleRateIn,
            self->sampleRateOut,
            codecFrameSize,
            self->flags
            );

    if (errorStatus != SBRDEC_OK) {
      return errorStatus;
    }

    hSbrHeader->syncState = UPSAMPLING;

    errorStatus = sbrDecoder_HeaderUpdate(
            self,
            hSbrHeader,
            HEADER_NOT_PRESENT,
            pSbrChannel,
            hSbrElement->nChannels
            );

    if (errorStatus != SBRDEC_OK) {
      hSbrHeader->syncState = SBR_NOT_INITIALIZED;
      return errorStatus;
    }
  }

  /* reset */
  if (hSbrHeader->status & SBRDEC_HDR_STAT_RESET) {
    int ch;
    for (ch = 0 ; ch < numElementChannels; ch++) {
      SBR_ERROR errorStatusTmp = SBRDEC_OK;

      errorStatusTmp = resetSbrDec (
             &pSbrChannel[ch]->SbrDec,
              hSbrHeader,
             &pSbrChannel[ch]->prevFrameData,
              self->flags & SBRDEC_LOW_POWER,
              self->synDownsampleFac
              );

      if (errorStatusTmp != SBRDEC_OK) {
        errorStatus = errorStatusTmp;
      }
    }
    hSbrHeader->status &= ~SBRDEC_HDR_STAT_RESET;
  }

  /* decoding */
  if ( (hSbrHeader->syncState == SBR_ACTIVE)
    || ((hSbrHeader->syncState == SBR_HEADER) && (hSbrHeader->frameErrorFlag == 0)) )
  {
    errorStatus = SBRDEC_OK;

    decodeSbrData (hSbrHeader,
                   hFrameDataLeft,
                  &pSbrChannel[0]->prevFrameData,
                   (stereo) ? hFrameDataRight : NULL,
                   (stereo) ? &pSbrChannel[1]->prevFrameData : NULL);


    /* Now we have a full parameter set and can do parameter
       based concealment instead of plain upsampling. */
    hSbrHeader->syncState = SBR_ACTIVE;
  }

  /* decode PS data if available */
  if (h_ps_d != NULL && psPossible) {
    int applyPs = 1;

    /* define which frame delay line slot to process */
    h_ps_d->processSlot = hSbrElement->useFrameSlot;

    applyPs = DecodePs(h_ps_d, hSbrHeader->frameErrorFlag);
    self->flags |= (applyPs) ? SBRDEC_PS_DECODED : 0;
  }

  /* Set strides for reading and writing */
  if (interleaved) {
    strideIn = numInChannels;
    if ( psPossible )
      strideOut = (numInChannels < 2) ? 2 : numInChannels;
    else
      strideOut = numInChannels;
    offset0 = channelMapping[0];
    offset1 = channelMapping[1];
  } else {
    strideIn  = 1;
    strideOut = 1;
    offset0 = channelMapping[0]*2*codecFrameSize;
    offset1 = channelMapping[1]*2*codecFrameSize;
  }

  /* use same buffers for left and right channel and apply PS per timeslot */
  /* Process left channel */
//FDKprintf("self->codecFrameSize %d\t%d\n",self->codecFrameSize,self->sampleRateIn);
  sbr_dec (&pSbrChannel[0]->SbrDec,
            timeData + offset0,
            timeData + offset0,
           &pSbrChannel[1]->SbrDec,
            timeData + offset1,
            strideIn,
            strideOut,
            hSbrHeader,
            hFrameDataLeft,
           &pSbrChannel[0]->prevFrameData,
            (hSbrHeader->syncState == SBR_ACTIVE),
            h_ps_d,
            self->flags
          );

  if (stereo) {
    /* Process right channel */
    sbr_dec (&pSbrChannel[1]->SbrDec,
              timeData + offset1,
              timeData + offset1,
              NULL,
              NULL,
              strideIn,
              strideOut,
              hSbrHeader,
              hFrameDataRight,
             &pSbrChannel[1]->prevFrameData,
              (hSbrHeader->syncState == SBR_ACTIVE),
              NULL,
              self->flags
            );
  }

  if (h_ps_d != NULL) {
    /* save PS status for next run */
    h_ps_d->psDecodedPrv = (self->flags & SBRDEC_PS_DECODED) ? 1 : 0 ;
  }

  if ( psPossible
    )
  {
    FDK_ASSERT(strideOut > 1);
    if ( !(self->flags & SBRDEC_PS_DECODED) ) {
      /* A decoder which is able to decode PS has to produce a stereo output even if no PS data is availble. */
      /* So copy left channel to right channel.                                                              */
      if (interleaved) {
        INT_PCM *ptr;
        INT i;
        FDK_ASSERT(strideOut == 2);

        ptr = timeData;
        for (i = codecFrameSize; i--; )
        {
          INT_PCM tmp; /* This temporal variable is required because some compilers can't do *ptr++ = *ptr++ correctly. */
          tmp = *ptr++; *ptr++ = tmp;
          tmp = *ptr++; *ptr++ = tmp;
        }
      } else {
        FDKmemcpy( timeData+2*codecFrameSize, timeData, 2*codecFrameSize*sizeof(INT_PCM) );
      }
    }
    *numOutChannels = 2;  /* Output minimum two channels when PS is enabled. */
  }

  return errorStatus;
}


SBR_ERROR sbrDecoder_Apply ( HANDLE_SBRDECODER   self,
                             INT_PCM            *timeData,
                             int                *numChannels,
                             int                *sampleRate,
                             const UCHAR         channelMapping[(6)],
                             const int           interleaved,
                             const int           coreDecodedOk,
                             UCHAR              *psDecoded )
{
  SBR_ERROR errorStatus = SBRDEC_OK;

  int   psPossible = 0;
  int   sbrElementNum;
  int   numCoreChannels = *numChannels;
  int   numSbrChannels  = 0;

  psPossible = *psDecoded;

  if (self->numSbrElements < 1) {
    /* exit immediately to avoid access violations */
    return SBRDEC_CREATE_ERROR;
  }

  /* Sanity check of allocated SBR elements. */
  for (sbrElementNum=0; sbrElementNum<self->numSbrElements; sbrElementNum++) {
    if (self->pSbrElement[sbrElementNum] == NULL) {
      return SBRDEC_CREATE_ERROR;
    }
  }

  if (self->numSbrElements != 1 || self->pSbrElement[0]->elementID != ID_SCE) {
    psPossible = 0;
  }


  /* In case of non-interleaved time domain data and upsampling, make room for bigger SBR output. */
  if (self->synDownsampleFac == 1 && interleaved == 0) {
    int c, outputFrameSize;

    outputFrameSize =
            self->pSbrElement[0]->pSbrChannel[0]->SbrDec.SynthesisQMF.no_channels
            * self->pSbrElement[0]->pSbrChannel[0]->SbrDec.SynthesisQMF.no_col;

    for (c=numCoreChannels-1; c>0; c--) {
      FDKmemmove(timeData + c*outputFrameSize, timeData + c*self->codecFrameSize , self->codecFrameSize*sizeof(INT_PCM));
    }
  }


  /* Make sure that even if no SBR data was found/parsed *psDecoded is returned 1 if psPossible was 0. */
  if (psPossible == 0) {
    self->flags &= ~SBRDEC_PS_DECODED;
  }

  /* Loop over SBR elements */
  for (sbrElementNum = 0; sbrElementNum<self->numSbrElements; sbrElementNum++)
  {
    int numElementChan;

    if (psPossible && self->pSbrElement[sbrElementNum]->pSbrChannel[1] == NULL) {
      errorStatus = SBRDEC_UNSUPPORTED_CONFIG;
      goto bail;
    }

    numElementChan = (self->pSbrElement[sbrElementNum]->elementID == ID_CPE) ? 2 : 1;

    /* If core signal is bad then force upsampling */
    if ( ! coreDecodedOk ) {
      self->pSbrElement[sbrElementNum]->frameErrorFlag[self->pSbrElement[sbrElementNum]->useFrameSlot] = 1;
    }

    errorStatus = sbrDecoder_DecodeElement (
                                 self,
                                 timeData,
                                 interleaved,
                                 channelMapping,
                                 sbrElementNum,
                                 numCoreChannels,
                                &numElementChan,
                                 psPossible
                               );

    if (errorStatus != SBRDEC_OK) {
      goto bail;
    }

    numSbrChannels += numElementChan;
    channelMapping += numElementChan;

    if (numSbrChannels >= numCoreChannels) {
      break;
    }
  }

  /* Update numChannels and samplerate */
  *numChannels = numSbrChannels;
  *sampleRate = self->sampleRateOut;
  *psDecoded = (self->flags & SBRDEC_PS_DECODED) ? 1 : 0;


bail:

  return errorStatus;
}


SBR_ERROR sbrDecoder_Close ( HANDLE_SBRDECODER *pSelf )
{
  HANDLE_SBRDECODER self = *pSelf;
  int i;

  if (self != NULL)
  {
    if (self->hParametricStereoDec != NULL) {
      DeletePsDec ( &self->hParametricStereoDec );
    }

    if (self->workBuffer1 != NULL) {
      FreeRam_SbrDecWorkBuffer1(&self->workBuffer1);
    }
    if (self->workBuffer2 != NULL) {
      FreeRam_SbrDecWorkBuffer2(&self->workBuffer2);
    }

    for (i = 0; i < (4); i++) {
      sbrDecoder_DestroyElement( self, i );
    }

    FreeRam_SbrDecoder(pSelf);
  }

  return SBRDEC_OK;
}


INT sbrDecoder_GetLibInfo( LIB_INFO *info )
{
  int i;

  if (info == NULL) {
    return -1;
  }

  /* search for next free tab */
  for (i = 0; i < FDK_MODULE_LAST; i++) {
    if (info[i].module_id == FDK_NONE)
      break;
  }
  if (i == FDK_MODULE_LAST)
    return -1;
  info += i;

  info->module_id = FDK_SBRDEC;
  info->version = LIB_VERSION(SBRDECODER_LIB_VL0, SBRDECODER_LIB_VL1, SBRDECODER_LIB_VL2);
  LIB_VERSION_STRING(info);
  info->build_date = (char *)SBRDECODER_LIB_BUILD_DATE;
  info->build_time = (char *)SBRDECODER_LIB_BUILD_TIME;
  info->title      = (char *)SBRDECODER_LIB_TITLE;

  /* Set flags */
  info->flags = 0
    | CAPF_SBR_HQ
    | CAPF_SBR_LP
    | CAPF_SBR_PS_MPEG
    | CAPF_SBR_CONCEALMENT
    | CAPF_SBR_DRC
      ;
  /* End of flags */

  return 0;
}