aacenc.cpp

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

© Copyright  1995 - 2015 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
----------------------------------------------------------------------------------------------------------- */

/***************************  Fast MPEG AAC Audio Encoder  **********************

   Initial author:       M. Schug / A. Groeschel
   contents/description: fast aac coder functions

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

#include "aacenc.h"

#include "bitenc.h"
#include "interface.h"
#include "psy_configuration.h"
#include "psy_main.h"
#include "qc_main.h"
#include "bandwidth.h"
#include "channel_map.h"
#include "tns_func.h"
#include "aacEnc_ram.h"

#include "genericStds.h"




#define MIN_BUFSIZE_PER_EFF_CHAN 6144

INT FDKaacEnc_CalcBitsPerFrame(
        const INT bitRate,
        const INT frameLength,
        const INT samplingRate
        )
{
    int shift = 0;
    while ((frameLength & ~((1 << (shift + 1)) - 1)) == frameLength
        && (samplingRate & ~((1 << (shift + 1)) - 1)) == samplingRate)
    {
      shift++;
    }

    return (bitRate*(frameLength>>shift)) / (samplingRate>>shift);
}

INT FDKaacEnc_CalcBitrate(
        const INT bitsPerFrame,
        const INT frameLength,
        const INT samplingRate
        )
{
    int shift = 0;
    while ((frameLength & ~((1 << (shift + 1)) - 1)) == frameLength
        && (samplingRate & ~((1 << (shift + 1)) - 1)) == samplingRate)
    {
      shift++;
    }

    return (bitsPerFrame * (samplingRate>>shift)) / ( frameLength>>shift) ;

}

static AAC_ENCODER_ERROR FDKaacEnc_InitCheckAncillary(INT bitRate,
                                                      INT framelength,
                                                      INT ancillaryRate,
                                                      INT *ancillaryBitsPerFrame,
                                                      INT sampleRate);

INT FDKaacEnc_LimitBitrate(
        HANDLE_TRANSPORTENC hTpEnc,
        INT coreSamplingRate,
        INT frameLength,
        INT nChannels,
        INT nChannelsEff,
        INT bitRate,
        INT averageBits,
        INT *pAverageBitsPerFrame,
        INT bitrateMode,
        INT nSubFrames
        )
{
  INT transportBits, prevBitRate, averageBitsPerFrame, shift = 0, iter=0;

  while ( (frameLength & ~((1<<(shift+1))-1)) == frameLength
    && (coreSamplingRate & ~((1<<(shift+1))-1)) == coreSamplingRate )
  {
    shift ++;
  }

  do {
    prevBitRate = bitRate;
     averageBitsPerFrame = (bitRate*(frameLength>>shift)) / (coreSamplingRate>>shift) / nSubFrames;

    if (pAverageBitsPerFrame != NULL) {
      *pAverageBitsPerFrame = averageBitsPerFrame;
    }

    if (hTpEnc != NULL) {
      transportBits = transportEnc_GetStaticBits(hTpEnc, averageBitsPerFrame);
    } else {
      /* Assume some worst case */
      transportBits = 208;
    }

    bitRate = FDKmax(bitRate, ((((40 * nChannels) + transportBits) * (coreSamplingRate)) / frameLength) );
    FDK_ASSERT(bitRate >= 0);

    bitRate = FDKmin(bitRate, ((nChannelsEff * MIN_BUFSIZE_PER_EFF_CHAN)*(coreSamplingRate>>shift)) / (frameLength>>shift)) ;
    FDK_ASSERT(bitRate >= 0);

  } while (prevBitRate != bitRate && iter++ < 3) ;

  return bitRate;
}


typedef struct
{
  AACENC_BITRATE_MODE bitrateMode;
  int chanBitrate[2]; /* mono/stereo settings */
} CONFIG_TAB_ENTRY_VBR;

static const CONFIG_TAB_ENTRY_VBR configTabVBR[] = {
  {AACENC_BR_MODE_CBR,   {     0,     0}} ,
  {AACENC_BR_MODE_VBR_1, { 32000, 20000}} ,
  {AACENC_BR_MODE_VBR_2, { 40000, 32000}} ,
  {AACENC_BR_MODE_VBR_3, { 56000, 48000}} ,
  {AACENC_BR_MODE_VBR_4, { 72000, 64000}} ,
  {AACENC_BR_MODE_VBR_5, {112000, 96000}}
};

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

     functionname: FDKaacEnc_GetVBRBitrate
     description:  Get VBR bitrate from vbr quality
     input params: int vbrQuality (VBR0, VBR1, VBR2)
                   channelMode
     returns:      vbr bitrate

 ------------------------------------------------------------------------------*/
INT FDKaacEnc_GetVBRBitrate(INT bitrateMode, CHANNEL_MODE channelMode)
{
  INT bitrate = 0;
  INT monoStereoMode = 0; /* default mono */

  if (FDKaacEnc_GetMonoStereoMode(channelMode)==EL_MODE_STEREO) {
      monoStereoMode = 1;
  }

  switch((AACENC_BITRATE_MODE)bitrateMode){
  case AACENC_BR_MODE_VBR_1:
  case AACENC_BR_MODE_VBR_2:
  case AACENC_BR_MODE_VBR_3:
  case AACENC_BR_MODE_VBR_4:
  case AACENC_BR_MODE_VBR_5:
    bitrate = configTabVBR[bitrateMode].chanBitrate[monoStereoMode];
    break;
  case AACENC_BR_MODE_INVALID:
  case AACENC_BR_MODE_CBR:
  case AACENC_BR_MODE_SFR:
  case AACENC_BR_MODE_FF:
  default:
    bitrate = 0;
    break;
  }

  /* convert channel bitrate to overall bitrate*/
  bitrate *= FDKaacEnc_GetChannelModeConfiguration(channelMode)->nChannelsEff;

  return bitrate;
}

/**
 * \brief  Convert encoder bitreservoir value for transport library.
 *
 * \param hAacEnc               Encoder handle
 *
 * \return  Corrected bitreservoir level used in transport library.
 */
static INT FDKaacEnc_EncBitresToTpBitres(
        const HANDLE_AAC_ENC      hAacEnc
        )
{
  INT transporBitreservoir = 0;

  switch (hAacEnc->bitrateMode) {
    case AACENC_BR_MODE_CBR:
      transporBitreservoir = hAacEnc->qcKernel->bitResTot; /* encoder bitreservoir level */
      break;
    case AACENC_BR_MODE_VBR_1:
    case AACENC_BR_MODE_VBR_2:
    case AACENC_BR_MODE_VBR_3:
    case AACENC_BR_MODE_VBR_4:
    case AACENC_BR_MODE_VBR_5:
      transporBitreservoir = FDK_INT_MAX; /* signal variable bitrate */
      break;
    case AACENC_BR_MODE_FF:
    case AACENC_BR_MODE_SFR:
      transporBitreservoir = 0;           /* super framing and fixed framing */
      break;                              /* without bitreservoir signaling */
    default:
    case AACENC_BR_MODE_INVALID:
      transporBitreservoir = 0;           /* invalid configuration*/
      FDK_ASSERT(0);
  }

  if (hAacEnc->config->audioMuxVersion==2) {
    transporBitreservoir = MIN_BUFSIZE_PER_EFF_CHAN * hAacEnc->channelMapping.nChannelsEff;
  }

  return transporBitreservoir;
}

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

     functionname: FDKaacEnc_AacInitDefaultConfig
     description:  gives reasonable default configuration
     returns:      ---

 ------------------------------------------------------------------------------*/
void FDKaacEnc_AacInitDefaultConfig(AACENC_CONFIG *config)
{
    /* make thepre initialization of the structs flexible */
    FDKmemclear(config, sizeof(AACENC_CONFIG));

    /* default ancillary */
    config->anc_Rate = 0;         /* no ancillary data */
    config->ancDataBitRate = 0;   /* no additional consumed bitrate */

    /* default configurations */
    config->bitRate         = -1;                   /* bitrate must be set*/
    config->averageBits     = -1;                   /* instead of bitrate/s we can configure bits/superframe */
    config->bitrateMode     = 0;
    config->bandWidth       = 0;                    /* get bandwidth from table */
    config->useTns          = TNS_ENABLE_MASK;      /* tns enabled completly */
    config->usePns          = 1;                    /* depending on channelBitrate this might be set to 0 later */
    config->useIS           = 1;                    /* Intensity Stereo Configuration */
    config->framelength     = -1;                   /* Framesize not configured */
    config->syntaxFlags     = 0;                    /* default syntax with no specialities */
    config->epConfig        = -1;                   /* no ER syntax -> no additional error protection */
    config->nSubFrames      = 1;                    /* default, no sub frames */
    config->channelOrder    = CH_ORDER_MPEG;        /* Use MPEG channel ordering. */
    config->channelMode     = MODE_UNKNOWN;
    config->minBitsPerFrame = -1;                   /* minum number of bits in each AU */
    config->maxBitsPerFrame = -1;                   /* minum number of bits in each AU */
    config->bitreservoir    = -1;                   /* default, uninitialized value */
    config->audioMuxVersion = -1;                   /* audio mux version not configured */

    /* init tabs in fixpoint_math */
    InitLdInt();
    InitInvSqrtTab();
}


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

    functionname: FDKaacEnc_Open
    description:  allocate and initialize a new encoder instance
    returns:      error code

  ---------------------------------------------------------------------------*/
AAC_ENCODER_ERROR FDKaacEnc_Open(HANDLE_AAC_ENC  *phAacEnc,
                                 const INT        nElements,
                                 const INT        nChannels,
                                 const INT        nSubFrames)
{
  AAC_ENCODER_ERROR ErrorStatus;
  AAC_ENC           *hAacEnc = NULL;
  UCHAR             *dynamicRAM = NULL;

  if (phAacEnc==NULL) {
    return AAC_ENC_INVALID_HANDLE;
  }

  /* allocate encoder structure */
  hAacEnc = GetRam_aacEnc_AacEncoder();
  if (hAacEnc == NULL) {
    ErrorStatus = AAC_ENC_NO_MEMORY;
    goto bail;
  }
  FDKmemclear(hAacEnc, sizeof(AAC_ENC));

  hAacEnc->dynamic_RAM = GetAACdynamic_RAM();
  dynamicRAM = (UCHAR*)hAacEnc->dynamic_RAM;

  /* allocate the Psy aud Psy Out structure */
   ErrorStatus = FDKaacEnc_PsyNew(&hAacEnc->psyKernel,
                                  nElements,
                                  nChannels
                                 ,dynamicRAM
                                 );
   if (ErrorStatus != AAC_ENC_OK)
     goto bail;

   ErrorStatus = FDKaacEnc_PsyOutNew(hAacEnc->psyOut,
                                     nElements,
                                     nChannels,
                                     nSubFrames
                                    ,dynamicRAM
                                    );
   if (ErrorStatus != AAC_ENC_OK)
     goto bail;

  /* allocate the Q&C Out structure */
  ErrorStatus = FDKaacEnc_QCOutNew(hAacEnc->qcOut,
                                   nElements,
                                   nChannels,
                                   nSubFrames
                                  ,dynamicRAM
                                   );
  if (ErrorStatus != AAC_ENC_OK)
    goto bail;

  /* allocate the Q&C kernel */
  ErrorStatus = FDKaacEnc_QCNew(&hAacEnc->qcKernel,
                                 nElements
                                ,dynamicRAM
                                );
  if (ErrorStatus != AAC_ENC_OK)
    goto bail;

  hAacEnc->maxChannels = nChannels;
  hAacEnc->maxElements = nElements;
  hAacEnc->maxFrames   = nSubFrames;

bail:
  *phAacEnc = hAacEnc;
  return ErrorStatus;
}


AAC_ENCODER_ERROR FDKaacEnc_Initialize(HANDLE_AAC_ENC      hAacEnc,
                                       AACENC_CONFIG      *config,     /* pre-initialized config struct */
                                       HANDLE_TRANSPORTENC hTpEnc,
                                       ULONG               initFlags)
{
  AAC_ENCODER_ERROR ErrorStatus;
  INT psyBitrate, tnsMask; //INT profile = 1;
  CHANNEL_MAPPING   *cm = NULL;

  INT qmbfac, qbw;
  FIXP_DBL mbfac, bw_ratio;
  QC_INIT qcInit;
  INT averageBitsPerFrame = 0;

  if (config==NULL)
    return AAC_ENC_INVALID_HANDLE;

  /******************* sanity checks *******************/

  /* check config structure */
  if (config->nChannels  < 1 || config->nChannels > (8)) {
    return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
  }

  /* check sample rate */
  switch (config->sampleRate)
  {
    case 8000:
    case 11025:
    case 12000:
    case 16000:
    case 22050:
    case 24000:
    case 32000:
    case 44100:
    case 48000:
    case 64000:
    case 88200:
    case 96000:
      break;
    default:
      return AAC_ENC_UNSUPPORTED_SAMPLINGRATE;
  }

  /* bitrate has to be set */
  if (config->bitRate==-1) {
      return AAC_ENC_UNSUPPORTED_BITRATE;
  }

  /* check bit rate */

  if (FDKaacEnc_LimitBitrate(
          hTpEnc,
          config->sampleRate,
          config->framelength,
          config->nChannels,
          FDKaacEnc_GetChannelModeConfiguration(config->channelMode)->nChannelsEff,
          config->bitRate,
          config->averageBits,
         &averageBitsPerFrame,
          config->bitrateMode,
          config->nSubFrames
          ) != config->bitRate
      && !((config->bitrateMode>=1) && (config->bitrateMode<=5))
     )
  {
    return AAC_ENC_UNSUPPORTED_BITRATE;
  }

  if (config->syntaxFlags & AC_ER_VCB11) {
      return AAC_ENC_UNSUPPORTED_ER_FORMAT;
  }
  if (config->syntaxFlags & AC_ER_HCR) {
      return AAC_ENC_UNSUPPORTED_ER_FORMAT;
  }

  /* check frame length */
  switch (config->framelength)
  {
    case 1024:
      if ( config->audioObjectType == AOT_ER_AAC_LD
        || config->audioObjectType == AOT_ER_AAC_ELD )
      {
        return AAC_ENC_INVALID_FRAME_LENGTH;
      }
      break;
    case 512:
    case 480:
      if ( config->audioObjectType != AOT_ER_AAC_LD
        && config->audioObjectType != AOT_ER_AAC_ELD )
      {
        return AAC_ENC_INVALID_FRAME_LENGTH;
      }
      break;
    default:
      return AAC_ENC_INVALID_FRAME_LENGTH;
  }

  if (config->anc_Rate != 0) {

     ErrorStatus = FDKaacEnc_InitCheckAncillary(config->bitRate,
                                                config->framelength,
                                                config->anc_Rate,
                                               &hAacEnc->ancillaryBitsPerFrame,
                                                config->sampleRate);
     if (ErrorStatus != AAC_ENC_OK)
       goto bail;


     /* update estimated consumed bitrate */
     config->ancDataBitRate += ( (hAacEnc->ancillaryBitsPerFrame * config->sampleRate) / config->framelength );

  }

  /* maximal allowed DSE bytes in frame */
  {
  /* fixpoint calculation*/
  INT q_res, encBitrate, sc;
  FIXP_DBL tmp = fDivNorm(config->framelength, config->sampleRate, &q_res);
  encBitrate = (config->bitRate/*-config->ancDataBitRate*/)- (INT)(config->nChannels*8000);
  sc = CountLeadingBits(encBitrate);
  config->maxAncBytesPerAU = FDKmin( (256), FDKmax(0,(INT)(fMultDiv2(tmp, (FIXP_DBL)(encBitrate<<sc))>>(-q_res+sc-1+3))) );
  }

  /* bind config to hAacEnc->config */
  hAacEnc->config = config;

  /* set hAacEnc->bitrateMode */
  hAacEnc->bitrateMode = (AACENC_BITRATE_MODE)config->bitrateMode;

  hAacEnc->encoderMode = config->channelMode;

  ErrorStatus = FDKaacEnc_InitChannelMapping(hAacEnc->encoderMode, config->channelOrder, &hAacEnc->channelMapping);
  if (ErrorStatus != AAC_ENC_OK)
    goto bail;

  cm = &hAacEnc->channelMapping;

  ErrorStatus = FDKaacEnc_DetermineBandWidth(&hAacEnc->config->bandWidth,
                                             config->bandWidth,
                                             config->bitRate - config->ancDataBitRate,
                                             hAacEnc->bitrateMode,
                                             config->sampleRate,
                                             config->framelength,
                                             cm,
                                             hAacEnc->encoderMode);
  if (ErrorStatus != AAC_ENC_OK)
    goto bail;

  hAacEnc->bandwidth90dB = (INT)hAacEnc->config->bandWidth;

  tnsMask = config->useTns ? TNS_ENABLE_MASK : 0x0;
  psyBitrate = config->bitRate - config->ancDataBitRate;

  ErrorStatus = FDKaacEnc_psyInit(hAacEnc->psyKernel,
                                  hAacEnc->psyOut,
                                  hAacEnc->maxFrames,
                                  hAacEnc->maxChannels,
                                  config->audioObjectType,
                                  cm);
  if (ErrorStatus != AAC_ENC_OK)
    goto bail;

  ErrorStatus = FDKaacEnc_psyMainInit(hAacEnc->psyKernel,
                                      config->audioObjectType,
                                      cm,
                                      config->sampleRate,
                                      config->framelength,
                                      psyBitrate,
                                      tnsMask,
                                      hAacEnc->bandwidth90dB,
                                      config->usePns,
                                      config->useIS,
                                      config->syntaxFlags,
                                      initFlags);
  if (ErrorStatus != AAC_ENC_OK)
    goto bail;

  ErrorStatus = FDKaacEnc_QCOutInit(hAacEnc->qcOut, hAacEnc->maxFrames, cm);
  if (ErrorStatus != AAC_ENC_OK)
    goto bail;



  qcInit.channelMapping      = &hAacEnc->channelMapping;
  qcInit.sceCpe              = 0;

  if ((config->bitrateMode>=1) && (config->bitrateMode<=5)) {
      qcInit.averageBits     = (averageBitsPerFrame+7)&~7;
      qcInit.bitRes          = MIN_BUFSIZE_PER_EFF_CHAN*cm->nChannelsEff;
      qcInit.maxBits         = MIN_BUFSIZE_PER_EFF_CHAN*cm->nChannelsEff;
      qcInit.maxBits         = (config->maxBitsPerFrame!=-1) ? fixMin(qcInit.maxBits, config->maxBitsPerFrame) : qcInit.maxBits;
      qcInit.maxBits         = fixMax(qcInit.maxBits, (averageBitsPerFrame+7)&~7);
      qcInit.minBits         = (config->minBitsPerFrame!=-1) ? config->minBitsPerFrame : 0;
      qcInit.minBits         = fixMin(qcInit.minBits, averageBitsPerFrame&~7);
  }
  else
  {
      int maxBitres;
      qcInit.averageBits     = (averageBitsPerFrame+7)&~7;
      maxBitres              = (MIN_BUFSIZE_PER_EFF_CHAN*cm->nChannelsEff) - qcInit.averageBits;
      qcInit.bitRes          = (config->bitreservoir!=-1) ? FDKmin(config->bitreservoir, maxBitres) : maxBitres;

      qcInit.maxBits         = fixMin(MIN_BUFSIZE_PER_EFF_CHAN*cm->nChannelsEff, ((averageBitsPerFrame+7)&~7)+qcInit.bitRes);
      qcInit.maxBits         = (config->maxBitsPerFrame!=-1) ? fixMin(qcInit.maxBits, config->maxBitsPerFrame) : qcInit.maxBits;
      qcInit.maxBits         = fixMin(MIN_BUFSIZE_PER_EFF_CHAN*cm->nChannelsEff, fixMax(qcInit.maxBits, (averageBitsPerFrame+7+8)&~7));

      qcInit.minBits         = fixMax(0, ((averageBitsPerFrame-1)&~7)-qcInit.bitRes-transportEnc_GetStaticBits(hTpEnc, ((averageBitsPerFrame+7)&~7)+qcInit.bitRes));
      qcInit.minBits         = (config->minBitsPerFrame!=-1) ? fixMax(qcInit.minBits, config->minBitsPerFrame) : qcInit.minBits;
      qcInit.minBits         = fixMin(qcInit.minBits, (averageBitsPerFrame - transportEnc_GetStaticBits(hTpEnc, qcInit.maxBits))&~7);
  }

  qcInit.sampleRate          = config->sampleRate;
  qcInit.advancedBitsToPe    = isLowDelay(config->audioObjectType) ? 1 : 0 ;
  qcInit.nSubFrames          = config->nSubFrames;
  qcInit.padding.paddingRest = config->sampleRate;

  /* Calc meanPe: qcInit.meanPe = 10.0f * FRAME_LEN_LONG * hAacEnc->bandwidth90dB/(config->sampleRate/2.0f); */
  bw_ratio = fDivNorm((FIXP_DBL)(10*config->framelength*hAacEnc->bandwidth90dB), (FIXP_DBL)(config->sampleRate), &qbw);
  qcInit.meanPe = FDKmax((INT)scaleValue(bw_ratio, qbw+1-(DFRACT_BITS-1)), 1);

  /* Calc maxBitFac */
  mbfac = fDivNorm((MIN_BUFSIZE_PER_EFF_CHAN-744)*cm->nChannelsEff, qcInit.averageBits/qcInit.nSubFrames, &qmbfac);
  qmbfac = DFRACT_BITS-1-qmbfac;
  qcInit.maxBitFac = (qmbfac > 24) ? (mbfac >> (qmbfac - 24)):(mbfac << (24 - qmbfac));

  switch(config->bitrateMode){
  case AACENC_BR_MODE_CBR:
    qcInit.bitrateMode = QCDATA_BR_MODE_CBR;
    break;
  case AACENC_BR_MODE_VBR_1:
    qcInit.bitrateMode = QCDATA_BR_MODE_VBR_1;
    break;
  case AACENC_BR_MODE_VBR_2:
    qcInit.bitrateMode = QCDATA_BR_MODE_VBR_2;
    break;
  case AACENC_BR_MODE_VBR_3:
    qcInit.bitrateMode = QCDATA_BR_MODE_VBR_3;
    break;
  case AACENC_BR_MODE_VBR_4:
    qcInit.bitrateMode = QCDATA_BR_MODE_VBR_4;
    break;
  case AACENC_BR_MODE_VBR_5:
    qcInit.bitrateMode = QCDATA_BR_MODE_VBR_5;
    break;
  case AACENC_BR_MODE_SFR:
    qcInit.bitrateMode = QCDATA_BR_MODE_SFR;
    break;
  case AACENC_BR_MODE_FF:
    qcInit.bitrateMode = QCDATA_BR_MODE_FF;
    break;
  default:
    ErrorStatus = AAC_ENC_UNSUPPORTED_BITRATE_MODE;
    goto bail;
  }

  qcInit.invQuant = (config->useRequant)?2:0;

  /* maxIterations should be set to the maximum number of requantization iterations that are
   * allowed before the crash recovery functionality is activated. This setting should be adjusted
   * to the processing power available, i.e. to the processing power headroom in one frame that is
   * still left after normal encoding without requantization. Please note that if activated this
   * functionality is used most likely only in cases where the encoder is operating beyond
   * recommended settings, i.e. the audio quality is suboptimal anyway. Activating the crash
   * recovery does not further reduce audio quality significantly in these cases. */
  if ( (config->audioObjectType == AOT_ER_AAC_LD) || (config->audioObjectType == AOT_ER_AAC_ELD) ) {
    qcInit.maxIterations = 2;
  }
  else
  {
    qcInit.maxIterations = 5;
  }

  qcInit.bitrate = config->bitRate - config->ancDataBitRate;

  qcInit.staticBits = transportEnc_GetStaticBits(hTpEnc, qcInit.averageBits/qcInit.nSubFrames);

  ErrorStatus = FDKaacEnc_QCInit(hAacEnc->qcKernel, &qcInit);
  if (ErrorStatus != AAC_ENC_OK)
    goto bail;

  hAacEnc->aot = hAacEnc->config->audioObjectType;

  /* common things */

  return AAC_ENC_OK;

bail:

  return ErrorStatus;
}


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

    functionname: FDKaacEnc_EncodeFrame
    description:  encodes one frame
    returns:      error code

  ---------------------------------------------------------------------------*/
AAC_ENCODER_ERROR FDKaacEnc_EncodeFrame( HANDLE_AAC_ENC       hAacEnc,          /* encoder handle */
                                         HANDLE_TRANSPORTENC  hTpEnc,
                                         INT_PCM* RESTRICT    inputBuffer,
                                         INT*                 nOutBytes,
                                         AACENC_EXT_PAYLOAD   extPayload[MAX_TOTAL_EXT_PAYLOADS]
                                       )
{
    AAC_ENCODER_ERROR ErrorStatus;
    int    el, n, c=0;
    UCHAR  extPayloadUsed[MAX_TOTAL_EXT_PAYLOADS];

    CHANNEL_MAPPING *cm      = &hAacEnc->channelMapping;



    PSY_OUT *psyOut = hAacEnc->psyOut[c];
    QC_OUT  *qcOut  = hAacEnc->qcOut[c];

    FDKmemclear(extPayloadUsed, MAX_TOTAL_EXT_PAYLOADS * sizeof(UCHAR));

    qcOut->elementExtBits = 0; /* sum up all extended bit of each element */
    qcOut->staticBits     = 0; /* sum up side info bits of each element */
    qcOut->totalNoRedPe   = 0; /* sum up PE */

    /* advance psychoacoustics */
    for (el=0; el<cm->nElements; el++) {
        ELEMENT_INFO elInfo = cm->elInfo[el];

        if ( (elInfo.elType == ID_SCE)
          || (elInfo.elType == ID_CPE)
          || (elInfo.elType == ID_LFE) )
        {
            int ch;

            /* update pointer!*/
            for(ch=0;ch<elInfo.nChannelsInEl;ch++) {
                PSY_OUT_CHANNEL *psyOutChan = psyOut->psyOutElement[el]->psyOutChannel[ch];
                QC_OUT_CHANNEL  *qcOutChan = qcOut->qcElement[el]->qcOutChannel[ch];

                psyOutChan->mdctSpectrum       = qcOutChan->mdctSpectrum;
                psyOutChan->sfbSpreadEnergy  = qcOutChan->sfbSpreadEnergy;
                psyOutChan->sfbEnergy          = qcOutChan->sfbEnergy;
                psyOutChan->sfbEnergyLdData    = qcOutChan->sfbEnergyLdData;
                psyOutChan->sfbMinSnrLdData    = qcOutChan->sfbMinSnrLdData;
                psyOutChan->sfbThresholdLdData = qcOutChan->sfbThresholdLdData;

            }

            FDKaacEnc_psyMain(elInfo.nChannelsInEl,
                              hAacEnc->psyKernel->psyElement[el],
                              hAacEnc->psyKernel->psyDynamic,
                              hAacEnc->psyKernel->psyConf,
                              psyOut->psyOutElement[el],
                              inputBuffer,
                              cm->elInfo[el].ChannelIndex,
                              cm->nChannels

                    );

            /* FormFactor, Pe and staticBitDemand calculation */
            ErrorStatus = FDKaacEnc_QCMainPrepare(&elInfo,
                                                   hAacEnc->qcKernel->hAdjThr->adjThrStateElem[el],
                                                   psyOut->psyOutElement[el],
                                                   qcOut->qcElement[el],
                                                   hAacEnc->aot,
                                                   hAacEnc->config->syntaxFlags,
                                                   hAacEnc->config->epConfig);

            if (ErrorStatus != AAC_ENC_OK)
              return ErrorStatus;

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

            qcOut->qcElement[el]->extBitsUsed = 0;
            qcOut->qcElement[el]->nExtensions = 0;
            /* reset extension payload */
            FDKmemclear(&qcOut->qcElement[el]->extension, (1)*sizeof(QC_OUT_EXTENSION));

            for ( n = 0; n < MAX_TOTAL_EXT_PAYLOADS; n++ ) {
                if ( !extPayloadUsed[n]
                  && (extPayload[n].associatedChElement == el)
                  && (extPayload[n].dataSize > 0)
                  && (extPayload[n].pData != NULL) )
                {
                    int idx = qcOut->qcElement[el]->nExtensions++;

                    qcOut->qcElement[el]->extension[idx].type         = extPayload[n].dataType;   /* Perform a sanity check on the type? */
                    qcOut->qcElement[el]->extension[idx].nPayloadBits = extPayload[n].dataSize;
                    qcOut->qcElement[el]->extension[idx].pPayload = extPayload[n].pData;
                    /* Now ask the bitstream encoder how many bits we need to encode the data with the current bitstream syntax: */
                    qcOut->qcElement[el]->extBitsUsed +=
                          FDKaacEnc_writeExtensionData( NULL,
                                                       &qcOut->qcElement[el]->extension[idx],
                                                        0, 0,
                                                        hAacEnc->config->syntaxFlags,
                                                        hAacEnc->aot,
                                                        hAacEnc->config->epConfig );
                    extPayloadUsed[n] = 1;
                }
            }

            /* sum up extension and static bits for all channel elements */
            qcOut->elementExtBits += qcOut->qcElement[el]->extBitsUsed;
            qcOut->staticBits   += qcOut->qcElement[el]->staticBitsUsed;

            /* sum up pe */
            qcOut->totalNoRedPe += qcOut->qcElement[el]->peData.pe;
        }
    }

    qcOut->nExtensions   = 0;
    qcOut->globalExtBits = 0;

    /* reset extension payload */
    FDKmemclear(&qcOut->extension, (2+2)*sizeof(QC_OUT_EXTENSION));

    /* Add extension payload not assigned to an channel element
      (Ancillary data is the only supported type up to now) */
    for ( n = 0; n < MAX_TOTAL_EXT_PAYLOADS; n++ ) {
        if ( !extPayloadUsed[n]
          && (extPayload[n].associatedChElement == -1)
          && (extPayload[n].pData != NULL) )
        {
            UINT payloadBits = 0;

            if (extPayload[n].dataType == EXT_DATA_ELEMENT) {
                if (hAacEnc->ancillaryBitsPerFrame) {
                    /* granted frame dse bitrate */
                    payloadBits = hAacEnc->ancillaryBitsPerFrame;
                }
                else {
                    /* write anc data if bitrate constraint fulfilled */
                    if ((extPayload[n].dataSize>>3) <= hAacEnc->config->maxAncBytesPerAU) {
                        payloadBits = extPayload[n].dataSize;
                    }
                }
                payloadBits = fixMin( extPayload[n].dataSize, payloadBits );
            } else {
                payloadBits = extPayload[n].dataSize;
            }

            if (payloadBits > 0)
            {
                int idx = qcOut->nExtensions++;

                qcOut->extension[idx].type         = extPayload[n].dataType;   /* Perform a sanity check on the type? */
                qcOut->extension[idx].nPayloadBits = payloadBits;
                qcOut->extension[idx].pPayload = extPayload[n].pData;
                /* Now ask the bitstream encoder how many bits we need to encode the data with the current bitstream syntax: */
                qcOut->globalExtBits += FDKaacEnc_writeExtensionData( NULL,
                                                                     &qcOut->extension[idx],
                                                                      0, 0,
                                                                      hAacEnc->config->syntaxFlags,
                                                                      hAacEnc->aot,
                                                                      hAacEnc->config->epConfig );
                if (extPayload[n].dataType == EXT_DATA_ELEMENT) {
                    /* substract the processed bits */
                    extPayload[n].dataSize -= payloadBits;
                }
                extPayloadUsed[n] = 1;
            }
        }
    }

    if (!(hAacEnc->config->syntaxFlags & (AC_SCALABLE|AC_ER))) {
      qcOut->globalExtBits += EL_ID_BITS;  /* add bits for ID_END */
    }

    /* build bitstream all nSubFrames */
    {
        INT totalBits    = 0;   /* Total AU bits */;
        INT avgTotalBits = 0;

        /*-------------------------------------------- */
        /* Get average total bits */
        /*-------------------------------------------- */
        {
            /* frame wise bitrate adaption */
            FDKaacEnc_AdjustBitrate(hAacEnc->qcKernel,
                                    cm,
                                   &avgTotalBits,
                                    hAacEnc->config->bitRate,
                                    hAacEnc->config->sampleRate,
                                    hAacEnc->config->framelength);

            /* adjust super frame bitrate */
            avgTotalBits *= hAacEnc->config->nSubFrames;
        }

        /* Make first estimate of transport header overhead.
           Take maximum possible frame size into account to prevent bitreservoir underrun. */
        hAacEnc->qcKernel->globHdrBits = transportEnc_GetStaticBits(hTpEnc, avgTotalBits + hAacEnc->qcKernel->bitResTot);


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

        ErrorStatus = FDKaacEnc_QCMain(hAacEnc->qcKernel,
                                       hAacEnc->psyOut,
                                       hAacEnc->qcOut,
                                       avgTotalBits,
                                       cm
                                      ,hAacEnc->aot,
                                       hAacEnc->config->syntaxFlags,
                                       hAacEnc->config->epConfig);

        if (ErrorStatus != AAC_ENC_OK)
            return ErrorStatus;
        /*-------------------------------------------- */

        /*-------------------------------------------- */
        ErrorStatus = FDKaacEnc_updateFillBits(cm,
                                               hAacEnc->qcKernel,
                                               hAacEnc->qcKernel->elementBits,
                                               hAacEnc->qcOut);
        if (ErrorStatus != AAC_ENC_OK)
            return ErrorStatus;

            /*-------------------------------------------- */
            ErrorStatus = FDKaacEnc_FinalizeBitConsumption(cm,
                                                           hAacEnc->qcKernel,
                                                           qcOut,
                                                           qcOut->qcElement,
                                                           hTpEnc,
                                                           hAacEnc->aot,
                                                           hAacEnc->config->syntaxFlags,
                                                           hAacEnc->config->epConfig);
            if (ErrorStatus != AAC_ENC_OK)
                return ErrorStatus;
            /*-------------------------------------------- */
            totalBits += qcOut->totalBits;


        /*-------------------------------------------- */
        FDKaacEnc_updateBitres(cm,
                               hAacEnc->qcKernel,
                               hAacEnc->qcOut);

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

        /* for ( all sub frames ) ... */
              /* write bitstream header */
              transportEnc_WriteAccessUnit(
                    hTpEnc,
                    totalBits,
                    FDKaacEnc_EncBitresToTpBitres(hAacEnc),
                    cm->nChannelsEff);

              /* write bitstream */
              ErrorStatus = FDKaacEnc_WriteBitstream(
                    hTpEnc,
                    cm,
                    qcOut,
                    psyOut,
                    hAacEnc->qcKernel,
                    hAacEnc->aot,
                    hAacEnc->config->syntaxFlags,
                    hAacEnc->config->epConfig);

              if (ErrorStatus != AAC_ENC_OK)
                return ErrorStatus;

              /* transportEnc_EndAccessUnit() is being called inside FDKaacEnc_WriteBitstream() */
              transportEnc_GetFrame(hTpEnc, nOutBytes);

    } /* -end- if (curFrame==hAacEnc->qcKernel->nSubFrames) */


    /*-------------------------------------------- */
    return AAC_ENC_OK;
}

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

    functionname:FDKaacEnc_Close
    description: delete encoder instance
    returns:

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

void FDKaacEnc_Close( HANDLE_AAC_ENC*  phAacEnc)   /* encoder handle */
{
    if (*phAacEnc == NULL) {
      return;
    }
    AAC_ENC *hAacEnc = (AAC_ENC*)*phAacEnc;

   if (hAacEnc->dynamic_RAM != NULL)
       FreeAACdynamic_RAM(&hAacEnc->dynamic_RAM);

    FDKaacEnc_PsyClose(&hAacEnc->psyKernel,hAacEnc->psyOut);

    FDKaacEnc_QCClose(&hAacEnc->qcKernel, hAacEnc->qcOut);

    FreeRam_aacEnc_AacEncoder(phAacEnc);
}


/* The following functions are in this source file only for convenience and */
/* need not be visible outside of a possible encoder library. */

/* basic defines for ancillary data */
#define MAX_ANCRATE 19200            /* ancillary rate >= 19200 isn't valid */

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

    functionname:  FDKaacEnc_InitCheckAncillary
    description:   initialize and check ancillary data struct
    return:        if success or NULL if error

  ---------------------------------------------------------------------------*/
static AAC_ENCODER_ERROR FDKaacEnc_InitCheckAncillary(INT bitRate,
                                                      INT framelength,
                                                      INT ancillaryRate,
                                                      INT *ancillaryBitsPerFrame,
                                                      INT sampleRate)
{
  INT diffToByteAlign;

  /* don't use negative ancillary rates */
  if ( ancillaryRate < -1 )
    return AAC_ENC_UNSUPPORTED_ANC_BITRATE;

  /* check if ancillary rate is ok */
  if ( (ancillaryRate != (-1)) && (ancillaryRate != 0) ) {
    /* ancRate <= 15% of bitrate && ancRate < 19200 */
    if ( ( ancillaryRate >= MAX_ANCRATE ) ||
         ( (ancillaryRate * 20) > (bitRate * 3) ) ) {
      return AAC_ENC_UNSUPPORTED_ANC_BITRATE;
    }
  }
  else if (ancillaryRate == -1) {
    /* if no special ancRate is requested but a ancillary file is
       stated, then generate a ancillary rate matching to the bitrate */
    if (bitRate >= (MAX_ANCRATE * 10)) {
      /* ancillary rate is 19199 */
      ancillaryRate = (MAX_ANCRATE - 1);
    }
    else { /* 10% of bitrate */
      ancillaryRate = bitRate / 10;
    }
  }

  /* make ancillaryBitsPerFrame byte align */
  *ancillaryBitsPerFrame = (ancillaryRate * framelength ) / sampleRate;
  diffToByteAlign = *ancillaryBitsPerFrame % 8;
  *ancillaryBitsPerFrame = *ancillaryBitsPerFrame - diffToByteAlign;

  return AAC_ENC_OK;
}