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

                       (C) copyright Fraunhofer-IIS (2004)
                               All Rights Reserved

    Please be advised that this software and/or program delivery is
    Confidential Information of Fraunhofer and subject to and covered by the

    Fraunhofer IIS Software Evaluation Agreement
    between Google Inc. and  Fraunhofer
    effective and in full force since March 1, 2012.

    You may use this software and/or program only under the terms and
    conditions described in the above mentioned Fraunhofer IIS Software
    Evaluation Agreement. Any other and/or further use requires a separate agreement.


   This software and/or program is protected by copyright law and international
   treaties. Any reproduction or distribution of this software and/or program,
   or any portion of it, may result in severe civil and criminal penalties, and
   will be prosecuted to the maximum extent possible under law.

 $Id$

*******************************************************************************/
/*!
  \file
  \brief  SBR bit writing routines $Revision: 36867 $
*/


#include "bit_sbr.h"

#include "code_env.h"
#include "cmondata.h"
#include "sbr.h"

#include "ps_main.h"

typedef enum {
  SBR_ID_SCE = 1,
  SBR_ID_CPE
} SBR_ELEMENT_TYPE;


static INT encodeSbrData (HANDLE_SBR_ENV_DATA       sbrEnvDataLeft,
                          HANDLE_SBR_ENV_DATA       sbrEnvDataRight,
                          HANDLE_PARAMETRIC_STEREO  hParametricStereo,
                          HANDLE_COMMON_DATA        cmonData,
                          SBR_ELEMENT_TYPE          sbrElem,
                          INT                       coupling,
                          UINT                      sbrSyntaxFlags);

static INT encodeSbrHeader (HANDLE_SBR_HEADER_DATA     sbrHeaderData,
                            HANDLE_SBR_BITSTREAM_DATA  sbrBitstreamData,
                            HANDLE_COMMON_DATA         cmonData);


static INT encodeSbrHeaderData (HANDLE_SBR_HEADER_DATA sbrHeaderData,
                                HANDLE_FDK_BITSTREAM   hBitStream);

static INT encodeSbrSingleChannelElement (HANDLE_SBR_ENV_DATA      sbrEnvData,
                                          HANDLE_FDK_BITSTREAM     hBitStream
                                          ,HANDLE_PARAMETRIC_STEREO hParametricStereo
                                          ,UINT  sbrSyntaxFlags
                                          );



static INT encodeSbrChannelPairElement (HANDLE_SBR_ENV_DATA      sbrEnvDataLeft,
                                        HANDLE_SBR_ENV_DATA      sbrEnvDataRight,
                                        HANDLE_PARAMETRIC_STEREO hParametricStereo,
                                        HANDLE_FDK_BITSTREAM     hBitStream,
                                        INT                      coupling);


static INT encodeSbrGrid (HANDLE_SBR_ENV_DATA   sbrEnvData,
                          HANDLE_FDK_BITSTREAM  hBitStream);

static int encodeLowDelaySbrGrid ( HANDLE_SBR_ENV_DATA sbrEnvData,
                                   HANDLE_FDK_BITSTREAM hBitStream,
                                   int transmitFreqs);

static INT encodeSbrDtdf (HANDLE_SBR_ENV_DATA   sbrEnvData,
                          HANDLE_FDK_BITSTREAM  hBitStream);

static INT writeNoiseLevelData (HANDLE_SBR_ENV_DATA   sbrEnvData,
                                HANDLE_FDK_BITSTREAM  hBitStream,
                                INT                   coupling);

static INT writeEnvelopeData (HANDLE_SBR_ENV_DATA    sbrEnvData,
                              HANDLE_FDK_BITSTREAM   hBitStream,
                              INT                    coupling);

static INT writeSyntheticCodingData (HANDLE_SBR_ENV_DATA  sbrEnvData,
                                     HANDLE_FDK_BITSTREAM hBitStream);


static INT encodeExtendedData (HANDLE_PARAMETRIC_STEREO hParametricStereo,
                               HANDLE_FDK_BITSTREAM     hBitStream);



static INT getSbrExtendedDataSize (HANDLE_PARAMETRIC_STEREO  hParametricStereo);

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

    functionname: FDKsbrEnc_WriteEnvSingleChannelElement
    description:  writes pure SBR single channel data element
    returns:      number of bits written
    input:
    output:

*****************************************************************************/
INT
FDKsbrEnc_WriteEnvSingleChannelElement(
                                       HANDLE_SBR_HEADER_DATA sbrHeaderData,
                                       HANDLE_PARAMETRIC_STEREO         hParametricStereo,
                                       HANDLE_SBR_BITSTREAM_DATA        sbrBitstreamData,
                                       HANDLE_SBR_ENV_DATA              sbrEnvData,
                                       HANDLE_COMMON_DATA               cmonData,
                                       UINT                             sbrSyntaxFlags
                                      )

{
  INT payloadBits = 0;

  cmonData->sbrHdrBits  = 0;
  cmonData->sbrDataBits = 0;

  /* write pure sbr data */
  if (sbrEnvData != NULL) {

    /* write header */
    payloadBits += encodeSbrHeader (sbrHeaderData,
                                    sbrBitstreamData,
                                    cmonData);


    /* write data */
    payloadBits += encodeSbrData (sbrEnvData,
                                  NULL,
                                  hParametricStereo,
                                  cmonData,
                                  SBR_ID_SCE,
                                  0,
                                  sbrSyntaxFlags);

  }
  return payloadBits;
}

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

    functionname: FDKsbrEnc_WriteEnvChannelPairElement
    description:  writes pure SBR channel pair data element
    returns:      number of bits written
    input:
    output:

*****************************************************************************/
INT
FDKsbrEnc_WriteEnvChannelPairElement (HANDLE_SBR_HEADER_DATA     sbrHeaderData,
                                      HANDLE_PARAMETRIC_STEREO   hParametricStereo,
                                      HANDLE_SBR_BITSTREAM_DATA  sbrBitstreamData,
                                      HANDLE_SBR_ENV_DATA        sbrEnvDataLeft,
                                      HANDLE_SBR_ENV_DATA        sbrEnvDataRight,
                                      HANDLE_COMMON_DATA         cmonData,
                                      UINT                       sbrSyntaxFlags)

{
  INT payloadBits = 0;
  cmonData->sbrHdrBits  = 0;
  cmonData->sbrDataBits = 0;

  /* write pure sbr data */
  if ((sbrEnvDataLeft != NULL) && (sbrEnvDataRight != NULL)) {

    /* write header */
    payloadBits += encodeSbrHeader (sbrHeaderData,
                                    sbrBitstreamData,
                                    cmonData);

    /* write data */
    payloadBits += encodeSbrData (sbrEnvDataLeft,
                                  sbrEnvDataRight,
                                  hParametricStereo,
                                  cmonData,
                                  SBR_ID_CPE,
                                  sbrHeaderData->coupling,
                                  sbrSyntaxFlags);

  }
  return payloadBits;
}

INT
FDKsbrEnc_CountSbrChannelPairElement (HANDLE_SBR_HEADER_DATA     sbrHeaderData,
                                      HANDLE_PARAMETRIC_STEREO   hParametricStereo,
                                      HANDLE_SBR_BITSTREAM_DATA  sbrBitstreamData,
                                      HANDLE_SBR_ENV_DATA        sbrEnvDataLeft,
                                      HANDLE_SBR_ENV_DATA        sbrEnvDataRight,
                                      HANDLE_COMMON_DATA         cmonData,
                                      UINT                       sbrSyntaxFlags)
{
  INT payloadBits;
  INT bitPos = FDKgetValidBits(&cmonData->sbrBitbuf);

  payloadBits = FDKsbrEnc_WriteEnvChannelPairElement(sbrHeaderData,
                                           hParametricStereo,
                                           sbrBitstreamData,
                                           sbrEnvDataLeft,
                                           sbrEnvDataRight,
                                           cmonData,
                                           sbrSyntaxFlags);

  FDKpushBack(&cmonData->sbrBitbuf, (FDKgetValidBits(&cmonData->sbrBitbuf) - bitPos) );

  return payloadBits;
}


void sbrEncoder_GetHeader(SBR_ENCODER   *sbrEncoder,
                          HANDLE_FDK_BITSTREAM hBs,
                          INT            element_index,
                          int            fSendHeaders)
{
  int bits;

  bits = encodeSbrHeaderData (&sbrEncoder->sbrElement[element_index]->sbrHeaderData, hBs);
    
  if (fSendHeaders == 0) {
    /* Prevent header being embedded into the SBR payload. */
    sbrEncoder->sbrElement[element_index]->sbrBitstreamData.NrSendHeaderData = -1;
    sbrEncoder->sbrElement[element_index]->sbrBitstreamData.HeaderActive = 0;
    sbrEncoder->sbrElement[element_index]->sbrBitstreamData.CountSendHeaderData = -1;
  }
}


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

    functionname: encodeSbrHeader
    description:  encodes SBR Header information
    returns:      number of bits written
    input:
    output:

*****************************************************************************/
static INT
encodeSbrHeader (HANDLE_SBR_HEADER_DATA     sbrHeaderData,
                 HANDLE_SBR_BITSTREAM_DATA  sbrBitstreamData,
                 HANDLE_COMMON_DATA         cmonData)
{
  INT payloadBits = 0;

  if (sbrBitstreamData->HeaderActive) {
    payloadBits += FDKwriteBits (&cmonData->sbrBitbuf, 1, 1);
    payloadBits += encodeSbrHeaderData (sbrHeaderData,
                                        &cmonData->sbrBitbuf);
  }
  else {
    payloadBits += FDKwriteBits (&cmonData->sbrBitbuf, 0, 1);
  }

  cmonData->sbrHdrBits = payloadBits;

  return payloadBits;
}



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

    functionname: encodeSbrHeaderData
    description:  writes sbr_header()
                  bs_protocol_version through bs_header_extra_2
    returns:      number of bits written
    input:
    output:

*****************************************************************************/
static INT
encodeSbrHeaderData (HANDLE_SBR_HEADER_DATA sbrHeaderData,
                     HANDLE_FDK_BITSTREAM hBitStream)

{
  INT payloadBits = 0;
  if (sbrHeaderData != NULL) {
    payloadBits += FDKwriteBits (hBitStream, sbrHeaderData->sbr_amp_res,
                              SI_SBR_AMP_RES_BITS);
    payloadBits += FDKwriteBits (hBitStream, sbrHeaderData->sbr_start_frequency,
                              SI_SBR_START_FREQ_BITS);
    payloadBits += FDKwriteBits (hBitStream, sbrHeaderData->sbr_stop_frequency,
                              SI_SBR_STOP_FREQ_BITS);
    payloadBits += FDKwriteBits (hBitStream, sbrHeaderData->sbr_xover_band,
                              SI_SBR_XOVER_BAND_BITS);

    payloadBits += FDKwriteBits (hBitStream, 0,
                              SI_SBR_RESERVED_BITS);

    payloadBits += FDKwriteBits (hBitStream, sbrHeaderData->header_extra_1,
                              SI_SBR_HEADER_EXTRA_1_BITS);
    payloadBits += FDKwriteBits (hBitStream, sbrHeaderData->header_extra_2,
                              SI_SBR_HEADER_EXTRA_2_BITS);


    if (sbrHeaderData->header_extra_1) {
      payloadBits += FDKwriteBits (hBitStream, sbrHeaderData->freqScale,
                                SI_SBR_FREQ_SCALE_BITS);
      payloadBits += FDKwriteBits (hBitStream, sbrHeaderData->alterScale,
                                SI_SBR_ALTER_SCALE_BITS);
      payloadBits += FDKwriteBits (hBitStream, sbrHeaderData->sbr_noise_bands,
                                SI_SBR_NOISE_BANDS_BITS);
    } /* sbrHeaderData->header_extra_1 */

    if (sbrHeaderData->header_extra_2) {
      payloadBits += FDKwriteBits (hBitStream, sbrHeaderData->sbr_limiter_bands,
                                SI_SBR_LIMITER_BANDS_BITS);
      payloadBits += FDKwriteBits (hBitStream, sbrHeaderData->sbr_limiter_gains,
                                SI_SBR_LIMITER_GAINS_BITS);
      payloadBits += FDKwriteBits (hBitStream, sbrHeaderData->sbr_interpol_freq,
                                SI_SBR_INTERPOL_FREQ_BITS);
      payloadBits += FDKwriteBits (hBitStream, sbrHeaderData->sbr_smoothing_length,
                                SI_SBR_SMOOTHING_LENGTH_BITS);

    } /* sbrHeaderData->header_extra_2 */
  } /* sbrHeaderData != NULL */

  return payloadBits;
}


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

    functionname: encodeSbrData
    description:  encodes sbr Data information
    returns:      number of bits written
    input:
    output:

*****************************************************************************/
static INT
encodeSbrData (HANDLE_SBR_ENV_DATA   sbrEnvDataLeft,
               HANDLE_SBR_ENV_DATA   sbrEnvDataRight,
               HANDLE_PARAMETRIC_STEREO   hParametricStereo,
               HANDLE_COMMON_DATA    cmonData,
               SBR_ELEMENT_TYPE      sbrElem,
               INT                   coupling,
               UINT                  sbrSyntaxFlags)
{
  INT payloadBits = 0;

  switch (sbrElem) {
  case SBR_ID_SCE:
    payloadBits += encodeSbrSingleChannelElement (sbrEnvDataLeft, &cmonData->sbrBitbuf, hParametricStereo, sbrSyntaxFlags);
    break;
  case SBR_ID_CPE:
    payloadBits += encodeSbrChannelPairElement (sbrEnvDataLeft, sbrEnvDataRight, hParametricStereo, &cmonData->sbrBitbuf, coupling);
    break;
  default:
    /* we never should apply SBR to any other element type */
    FDK_ASSERT (0);
  }

  cmonData->sbrDataBits = payloadBits;

  return payloadBits;
}

#define MODE_FREQ_TANS                          1
#define MODE_NO_FREQ_TRAN                       0
#define LD_TRANSMISSION                         MODE_FREQ_TANS
static int encodeFreqs (int mode) {
    return ((mode & MODE_FREQ_TANS) ? 1 : 0);
}


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

    functionname: encodeSbrSingleChannelElement
    description:  encodes sbr SCE information
    returns:      number of bits written
    input:
    output:

*****************************************************************************/
static INT
encodeSbrSingleChannelElement (HANDLE_SBR_ENV_DATA   sbrEnvData,
                               HANDLE_FDK_BITSTREAM  hBitStream
                               ,HANDLE_PARAMETRIC_STEREO hParametricStereo
                               ,UINT  sbrSyntaxFlags
                               )
{
  INT i, payloadBits = 0;

  payloadBits += FDKwriteBits (hBitStream, 0, SI_SBR_DATA_EXTRA_BITS); /* no reserved bits */

  if (sbrEnvData->ldGrid) {
      if ( sbrEnvData->hSbrBSGrid->frameClass != FIXFIXonly ) {
        /* encode normal SbrGrid */
        payloadBits += encodeSbrGrid (sbrEnvData, hBitStream);
      } else {
        /* use FIXFIXonly frame Grid */
        payloadBits += encodeLowDelaySbrGrid ( sbrEnvData, hBitStream, encodeFreqs(LD_TRANSMISSION));
      }
  }
  else
  {
    if (sbrSyntaxFlags & SBR_SYNTAX_SCALABLE) {
      payloadBits += FDKwriteBits (hBitStream, 1, SI_SBR_COUPLING_BITS);
    }
    payloadBits += encodeSbrGrid (sbrEnvData, hBitStream);
  }

  payloadBits += encodeSbrDtdf (sbrEnvData, hBitStream);

  for (i = 0; i < sbrEnvData->noOfnoisebands; i++) {
    payloadBits += FDKwriteBits (hBitStream, sbrEnvData->sbr_invf_mode_vec[i], SI_SBR_INVF_MODE_BITS);
  }

  payloadBits += writeEnvelopeData (sbrEnvData, hBitStream, 0);
  payloadBits += writeNoiseLevelData (sbrEnvData, hBitStream, 0);

  payloadBits += writeSyntheticCodingData (sbrEnvData,hBitStream);

  payloadBits += encodeExtendedData(hParametricStereo, hBitStream);

  return payloadBits;
}


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

    functionname: encodeSbrChannelPairElement
    description:  encodes sbr CPE information
    returns:
    input:
    output:

*****************************************************************************/
static INT
encodeSbrChannelPairElement (HANDLE_SBR_ENV_DATA   sbrEnvDataLeft,
                             HANDLE_SBR_ENV_DATA   sbrEnvDataRight,
                             HANDLE_PARAMETRIC_STEREO   hParametricStereo,
                             HANDLE_FDK_BITSTREAM  hBitStream,
                             INT                   coupling)
{
  INT payloadBits = 0;
  INT i = 0;

  payloadBits += FDKwriteBits (hBitStream, 0, SI_SBR_DATA_EXTRA_BITS); /* no reserved bits */

  payloadBits += FDKwriteBits (hBitStream, coupling, SI_SBR_COUPLING_BITS);

  if (coupling) {
    if (sbrEnvDataLeft->ldGrid) {
          if ( sbrEnvDataLeft->hSbrBSGrid->frameClass != FIXFIXonly ) {
            /* normal SbrGrid */
            payloadBits += encodeSbrGrid (sbrEnvDataLeft, hBitStream);

          } else {
              /* FIXFIXonly frame Grid */
              payloadBits += encodeLowDelaySbrGrid ( sbrEnvDataLeft, hBitStream, encodeFreqs(LD_TRANSMISSION));
          }
    } else
        payloadBits += encodeSbrGrid (sbrEnvDataLeft, hBitStream);

    payloadBits += encodeSbrDtdf (sbrEnvDataLeft, hBitStream);
    payloadBits += encodeSbrDtdf (sbrEnvDataRight, hBitStream);

    for (i = 0; i < sbrEnvDataLeft->noOfnoisebands; i++) {
      payloadBits += FDKwriteBits (hBitStream, sbrEnvDataLeft->sbr_invf_mode_vec[i], SI_SBR_INVF_MODE_BITS);
    }

    payloadBits += writeEnvelopeData  (sbrEnvDataLeft,  hBitStream,1);
    payloadBits += writeNoiseLevelData (sbrEnvDataLeft,  hBitStream,1);
    payloadBits += writeEnvelopeData  (sbrEnvDataRight, hBitStream,1);
    payloadBits += writeNoiseLevelData (sbrEnvDataRight, hBitStream,1);

    payloadBits += writeSyntheticCodingData (sbrEnvDataLeft,hBitStream);
    payloadBits += writeSyntheticCodingData (sbrEnvDataRight,hBitStream);

  } else { /* no coupling */
    FDK_ASSERT(sbrEnvDataLeft->ldGrid == sbrEnvDataRight->ldGrid);

    if (sbrEnvDataLeft->ldGrid || sbrEnvDataRight->ldGrid) {
    /* sbrEnvDataLeft (left channel) */
      if ( sbrEnvDataLeft->hSbrBSGrid->frameClass != FIXFIXonly) {
        /* no FIXFIXonly Frame so we dont need encodeLowDelaySbrGrid */
        /* normal SbrGrid */
        payloadBits += encodeSbrGrid (sbrEnvDataLeft,  hBitStream);

      } else {
        /* FIXFIXonly frame Grid */
          payloadBits += encodeLowDelaySbrGrid ( sbrEnvDataLeft, hBitStream, encodeFreqs(LD_TRANSMISSION));
      }

      /* sbrEnvDataRight (right channel) */
      if ( sbrEnvDataRight->hSbrBSGrid->frameClass != FIXFIXonly) {
        /* no FIXFIXonly Frame so we dont need encodeLowDelaySbrGrid */
        /* normal SbrGrid */
        payloadBits += encodeSbrGrid (sbrEnvDataRight, hBitStream);

      } else {
        /* FIXFIXonly frame Grid */
          payloadBits += encodeLowDelaySbrGrid ( sbrEnvDataRight, hBitStream, encodeFreqs(LD_TRANSMISSION));
      }
    } else
    {
        payloadBits += encodeSbrGrid (sbrEnvDataLeft,  hBitStream);
        payloadBits += encodeSbrGrid (sbrEnvDataRight, hBitStream);
    }
    payloadBits += encodeSbrDtdf (sbrEnvDataLeft,  hBitStream);
    payloadBits += encodeSbrDtdf (sbrEnvDataRight, hBitStream);

    for (i = 0; i < sbrEnvDataLeft->noOfnoisebands; i++) {
      payloadBits += FDKwriteBits (hBitStream, sbrEnvDataLeft->sbr_invf_mode_vec[i],
                                SI_SBR_INVF_MODE_BITS);
    }
    for (i = 0; i < sbrEnvDataRight->noOfnoisebands; i++) {
      payloadBits += FDKwriteBits (hBitStream, sbrEnvDataRight->sbr_invf_mode_vec[i],
                                SI_SBR_INVF_MODE_BITS);
    }

    payloadBits += writeEnvelopeData  (sbrEnvDataLeft,  hBitStream,0);
    payloadBits += writeEnvelopeData  (sbrEnvDataRight, hBitStream,0);
    payloadBits += writeNoiseLevelData (sbrEnvDataLeft,  hBitStream,0);
    payloadBits += writeNoiseLevelData (sbrEnvDataRight, hBitStream,0);

    payloadBits += writeSyntheticCodingData (sbrEnvDataLeft,hBitStream);
    payloadBits += writeSyntheticCodingData (sbrEnvDataRight,hBitStream);

  } /* coupling */

  payloadBits += encodeExtendedData(hParametricStereo, hBitStream);

  return payloadBits;
}

static INT ceil_ln2(INT x)
{
  INT tmp=-1;
  while((1<<++tmp) < x);
  return(tmp);
}


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

    functionname: encodeSbrGrid
    description:  if hBitStream != NULL writes bits that describes the
                  time/frequency grouping of a frame; else counts them only
    returns:      number of bits written or counted
    input:
    output:

*****************************************************************************/
static INT
encodeSbrGrid (HANDLE_SBR_ENV_DATA sbrEnvData, HANDLE_FDK_BITSTREAM hBitStream)
{
  INT payloadBits = 0;
  INT i, temp;
  INT bufferFrameStart = sbrEnvData->hSbrBSGrid->bufferFrameStart;
  INT numberTimeSlots  = sbrEnvData->hSbrBSGrid->numberTimeSlots;

  if (sbrEnvData->ldGrid)
    payloadBits += FDKwriteBits (hBitStream,
                                 sbrEnvData->hSbrBSGrid->frameClass,
                                 SBR_CLA_BITS_LD);
  else
    payloadBits += FDKwriteBits (hBitStream,
                                 sbrEnvData->hSbrBSGrid->frameClass,
                                 SBR_CLA_BITS);

  switch (sbrEnvData->hSbrBSGrid->frameClass) {
  case FIXFIXonly:
    FDK_ASSERT(0 /* Fatal error in encodeSbrGrid! */);
    break;
  case FIXFIX:
    temp = ceil_ln2(sbrEnvData->hSbrBSGrid->bs_num_env);
    payloadBits += FDKwriteBits (hBitStream, temp, SBR_ENV_BITS);
    if ((sbrEnvData->ldGrid) && (sbrEnvData->hSbrBSGrid->bs_num_env==1))
      payloadBits += FDKwriteBits(hBitStream, sbrEnvData->currentAmpResFF, SI_SBR_AMP_RES_BITS);
    payloadBits += FDKwriteBits (hBitStream, sbrEnvData->hSbrBSGrid->v_f[0], SBR_RES_BITS);

    break;

  case FIXVAR:
  case VARFIX:
    if (sbrEnvData->hSbrBSGrid->frameClass == FIXVAR)
      temp = sbrEnvData->hSbrBSGrid->bs_abs_bord - (bufferFrameStart + numberTimeSlots);
    else
      temp = sbrEnvData->hSbrBSGrid->bs_abs_bord - bufferFrameStart;

    payloadBits += FDKwriteBits (hBitStream, temp, SBR_ABS_BITS);
    payloadBits += FDKwriteBits (hBitStream, sbrEnvData->hSbrBSGrid->n, SBR_NUM_BITS);

    for (i = 0; i < sbrEnvData->hSbrBSGrid->n; i++) {
      temp = (sbrEnvData->hSbrBSGrid->bs_rel_bord[i] - 2) >> 1;
      payloadBits += FDKwriteBits (hBitStream, temp, SBR_REL_BITS);
    }

    temp = ceil_ln2(sbrEnvData->hSbrBSGrid->n + 2);
    payloadBits += FDKwriteBits (hBitStream, sbrEnvData->hSbrBSGrid->p, temp);

    for (i = 0; i < sbrEnvData->hSbrBSGrid->n + 1; i++) {
      payloadBits += FDKwriteBits (hBitStream, sbrEnvData->hSbrBSGrid->v_f[i],
                                SBR_RES_BITS);
    }
    break;

  case VARVAR:
    temp = sbrEnvData->hSbrBSGrid->bs_abs_bord_0 - bufferFrameStart;
    payloadBits += FDKwriteBits (hBitStream, temp, SBR_ABS_BITS);
    temp = sbrEnvData->hSbrBSGrid->bs_abs_bord_1 - (bufferFrameStart + numberTimeSlots);
    payloadBits += FDKwriteBits (hBitStream, temp, SBR_ABS_BITS);

    payloadBits += FDKwriteBits (hBitStream, sbrEnvData->hSbrBSGrid->bs_num_rel_0, SBR_NUM_BITS);
    payloadBits += FDKwriteBits (hBitStream, sbrEnvData->hSbrBSGrid->bs_num_rel_1, SBR_NUM_BITS);

    for (i = 0; i < sbrEnvData->hSbrBSGrid->bs_num_rel_0; i++) {
      temp = (sbrEnvData->hSbrBSGrid->bs_rel_bord_0[i] - 2) >> 1;
      payloadBits += FDKwriteBits (hBitStream, temp, SBR_REL_BITS);
    }

    for (i = 0; i < sbrEnvData->hSbrBSGrid->bs_num_rel_1; i++) {
      temp = (sbrEnvData->hSbrBSGrid->bs_rel_bord_1[i] - 2) >> 1;
      payloadBits += FDKwriteBits (hBitStream, temp, SBR_REL_BITS);
    }

    temp = ceil_ln2(sbrEnvData->hSbrBSGrid->bs_num_rel_0 +
                             sbrEnvData->hSbrBSGrid->bs_num_rel_1 + 2);
    payloadBits +=  FDKwriteBits (hBitStream, sbrEnvData->hSbrBSGrid->p, temp);

    temp = sbrEnvData->hSbrBSGrid->bs_num_rel_0 +
           sbrEnvData->hSbrBSGrid->bs_num_rel_1 + 1;

    for (i = 0; i < temp; i++) {
      payloadBits += FDKwriteBits (hBitStream, sbrEnvData->hSbrBSGrid->v_fLR[i],
                                SBR_RES_BITS);
    }
    break;
  }

  return payloadBits;
}

#define SBR_CLA_BITS_LD 1
/*****************************************************************************

    functionname: encodeLowDelaySbrGrid
    description:  if hBitStream != NULL writes bits that describes the
                  time/frequency grouping of a frame;
                  else counts them only
                  (this function only write the FIXFIXonly Bitstream data)
    returns:      number of bits written or counted
    input:
    output:

*****************************************************************************/
static int
encodeLowDelaySbrGrid (  HANDLE_SBR_ENV_DATA sbrEnvData,
                         HANDLE_FDK_BITSTREAM hBitStream,
                         int transmitFreqs
                       )
{
  int payloadBits = 0;
  int i;

  /* write FIXFIXonly Grid */
  /* write frameClass [1 bit] for FIXFIXonly Grid */
  payloadBits += FDKwriteBits(hBitStream, 1, SBR_CLA_BITS_LD);

  /* absolute Borders are fix: 0,X,X,X,nTimeSlots; so we dont have to transmit them */
  /* only transmit the transient position! */
  /* with this info (b1) we can reconstruct the Frame on Decoder side : */
  /* border[0] = 0; border[1] = b1; border[2]=b1+2; border[3] = nrTimeSlots */

  /* use 3 or 4bits for transient border (border) */
  if (sbrEnvData->hSbrBSGrid->numberTimeSlots == 8)
    payloadBits += FDKwriteBits ( hBitStream, sbrEnvData->hSbrBSGrid->bs_abs_bord, 3);
  else
    payloadBits += FDKwriteBits ( hBitStream, sbrEnvData->hSbrBSGrid->bs_abs_bord, 4);

  if (transmitFreqs) {
    /* write FreqRes grid */
    for (i = 0; i < sbrEnvData->hSbrBSGrid->bs_num_env; i++) {
      payloadBits += FDKwriteBits (hBitStream, sbrEnvData->hSbrBSGrid->v_f[i], SBR_RES_BITS);
    }
  }

  return payloadBits;
}

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

    functionname: encodeSbrDtdf
    description:  writes bits that describes the direction of the envelopes of a frame
    returns:      number of bits written
    input:
    output:

*****************************************************************************/
static INT
encodeSbrDtdf (HANDLE_SBR_ENV_DATA sbrEnvData, HANDLE_FDK_BITSTREAM hBitStream)
{
  INT i, payloadBits = 0, noOfNoiseEnvelopes;

  noOfNoiseEnvelopes = sbrEnvData->noOfEnvelopes > 1 ? 2 : 1;

  for (i = 0; i < sbrEnvData->noOfEnvelopes; ++i) {
    payloadBits += FDKwriteBits (hBitStream, sbrEnvData->domain_vec[i], SBR_DIR_BITS);
  }
  for (i = 0; i < noOfNoiseEnvelopes; ++i) {
    payloadBits +=  FDKwriteBits (hBitStream, sbrEnvData->domain_vec_noise[i], SBR_DIR_BITS);
  }

  return payloadBits;
}


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

    functionname: writeNoiseLevelData
    description:  writes bits corresponding to the noise-floor-level
    returns:      number of bits written
    input:
    output:

*****************************************************************************/
static INT
writeNoiseLevelData (HANDLE_SBR_ENV_DATA sbrEnvData, HANDLE_FDK_BITSTREAM hBitStream, INT coupling)
{
  INT j, i, payloadBits = 0;
  INT nNoiseEnvelopes = sbrEnvData->noOfEnvelopes > 1 ? 2 : 1;

  for (i = 0; i < nNoiseEnvelopes; i++) {
    switch (sbrEnvData->domain_vec_noise[i]) {
    case FREQ:
      if (coupling && sbrEnvData->balance) {
        payloadBits += FDKwriteBits (hBitStream,
                                  sbrEnvData->sbr_noise_levels[i * sbrEnvData->noOfnoisebands],
                                  sbrEnvData->si_sbr_start_noise_bits_balance);
      } else {
        payloadBits += FDKwriteBits (hBitStream,
                                  sbrEnvData->sbr_noise_levels[i * sbrEnvData->noOfnoisebands],
                                  sbrEnvData->si_sbr_start_noise_bits);
      }

      for (j = 1 + i * sbrEnvData->noOfnoisebands; j < (sbrEnvData->noOfnoisebands * (1 + i)); j++) {
        if (coupling) {
          if (sbrEnvData->balance) {
            /* coupling && balance */
            payloadBits += FDKwriteBits (hBitStream,
                                      sbrEnvData->hufftableNoiseBalanceFreqC[sbrEnvData->sbr_noise_levels[j] +
                                                                            CODE_BOOK_SCF_LAV_BALANCE11],
                                      sbrEnvData->hufftableNoiseBalanceFreqL[sbrEnvData->sbr_noise_levels[j] +
                                                                            CODE_BOOK_SCF_LAV_BALANCE11]);
          } else {
            /* coupling && !balance */
            payloadBits += FDKwriteBits (hBitStream,
                                      sbrEnvData->hufftableNoiseLevelFreqC[sbrEnvData->sbr_noise_levels[j] +
                                                                          CODE_BOOK_SCF_LAV11],
                                      sbrEnvData->hufftableNoiseLevelFreqL[sbrEnvData->sbr_noise_levels[j] +
                                                                          CODE_BOOK_SCF_LAV11]);
          }
        } else {
          /* !coupling */
          payloadBits += FDKwriteBits (hBitStream,
                                    sbrEnvData->hufftableNoiseFreqC[sbrEnvData->sbr_noise_levels[j] +
                                                                   CODE_BOOK_SCF_LAV11],
                                    sbrEnvData->hufftableNoiseFreqL[sbrEnvData->sbr_noise_levels[j] +
                                                                   CODE_BOOK_SCF_LAV11]);
        }
      }
      break;

    case TIME:
      for (j = i * sbrEnvData->noOfnoisebands; j < (sbrEnvData->noOfnoisebands * (1 + i)); j++) {
        if (coupling) {
          if (sbrEnvData->balance) {
            /* coupling && balance */
            payloadBits += FDKwriteBits (hBitStream,
                                      sbrEnvData->hufftableNoiseBalanceTimeC[sbrEnvData->sbr_noise_levels[j] +
                                                                            CODE_BOOK_SCF_LAV_BALANCE11],
                                      sbrEnvData->hufftableNoiseBalanceTimeL[sbrEnvData->sbr_noise_levels[j] +
                                                                            CODE_BOOK_SCF_LAV_BALANCE11]);
          } else {
            /* coupling && !balance */
            payloadBits += FDKwriteBits (hBitStream,
                                      sbrEnvData->hufftableNoiseLevelTimeC[sbrEnvData->sbr_noise_levels[j] +
                                                                          CODE_BOOK_SCF_LAV11],
                                      sbrEnvData->hufftableNoiseLevelTimeL[sbrEnvData->sbr_noise_levels[j] +
                                                                          CODE_BOOK_SCF_LAV11]);
          }
        } else {
          /* !coupling */
          payloadBits += FDKwriteBits (hBitStream,
                                    sbrEnvData->hufftableNoiseLevelTimeC[sbrEnvData->sbr_noise_levels[j] +
                                                                        CODE_BOOK_SCF_LAV11],
                                    sbrEnvData->hufftableNoiseLevelTimeL[sbrEnvData->sbr_noise_levels[j] +
                                                                        CODE_BOOK_SCF_LAV11]);
        }
      }
      break;
    }
  }
  return payloadBits;
}


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

    functionname: writeEnvelopeData
    description:  writes bits corresponding to the envelope
    returns:      number of bits written
    input:
    output:

*****************************************************************************/
static INT
writeEnvelopeData (HANDLE_SBR_ENV_DATA sbrEnvData, HANDLE_FDK_BITSTREAM hBitStream, INT coupling)
{
  INT payloadBits = 0, j, i, delta;

  for (j = 0; j < sbrEnvData->noOfEnvelopes; j++) { /* loop over all envelopes */
    if (sbrEnvData->domain_vec[j] == FREQ) {
      if (coupling && sbrEnvData->balance) {
        payloadBits += FDKwriteBits (hBitStream, sbrEnvData->ienvelope[j][0], sbrEnvData->si_sbr_start_env_bits_balance);
      } else {
        payloadBits += FDKwriteBits (hBitStream, sbrEnvData->ienvelope[j][0], sbrEnvData->si_sbr_start_env_bits);
      }
    }

    for (i = 1 - sbrEnvData->domain_vec[j]; i < sbrEnvData->noScfBands[j]; i++) {
      delta = sbrEnvData->ienvelope[j][i];
      if (coupling && sbrEnvData->balance) {
        FDK_ASSERT (fixp_abs (delta) <= sbrEnvData->codeBookScfLavBalance);
      } else {
        FDK_ASSERT (fixp_abs (delta) <= sbrEnvData->codeBookScfLav);
      }
      if (coupling) {
        if (sbrEnvData->balance) {
          if (sbrEnvData->domain_vec[j]) {
            /* coupling && balance && TIME */
            payloadBits += FDKwriteBits (hBitStream,
                                      sbrEnvData->hufftableBalanceTimeC[delta + sbrEnvData->codeBookScfLavBalance],
                                      sbrEnvData->hufftableBalanceTimeL[delta + sbrEnvData->codeBookScfLavBalance]);
          } else {
            /* coupling && balance && FREQ */
            payloadBits += FDKwriteBits (hBitStream,
                                      sbrEnvData->hufftableBalanceFreqC[delta + sbrEnvData->codeBookScfLavBalance],
                                      sbrEnvData->hufftableBalanceFreqL[delta + sbrEnvData->codeBookScfLavBalance]);
          }
        } else {
          if (sbrEnvData->domain_vec[j]) {
            /* coupling && !balance && TIME */
            payloadBits += FDKwriteBits (hBitStream,
                                      sbrEnvData->hufftableLevelTimeC[delta + sbrEnvData->codeBookScfLav],
                                      sbrEnvData->hufftableLevelTimeL[delta + sbrEnvData->codeBookScfLav]);
          } else {
            /* coupling && !balance && FREQ */
            payloadBits += FDKwriteBits (hBitStream,
                                      sbrEnvData->hufftableLevelFreqC[delta + sbrEnvData->codeBookScfLav],
                                      sbrEnvData->hufftableLevelFreqL[delta + sbrEnvData->codeBookScfLav]);
          }
        }
      } else {
        if (sbrEnvData->domain_vec[j]) {
          /* !coupling && TIME */
          payloadBits += FDKwriteBits (hBitStream,
                                    sbrEnvData->hufftableTimeC[delta + sbrEnvData->codeBookScfLav],
                                    sbrEnvData->hufftableTimeL[delta + sbrEnvData->codeBookScfLav]);
        } else {
          /* !coupling && FREQ */
          payloadBits += FDKwriteBits (hBitStream,
                                    sbrEnvData->hufftableFreqC[delta + sbrEnvData->codeBookScfLav],
                                    sbrEnvData->hufftableFreqL[delta + sbrEnvData->codeBookScfLav]);
        }
      }
    }
  }
  return payloadBits;
}


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

    functionname: encodeExtendedData
    description:  writes bits corresponding to the extended data
    returns:      number of bits written
    input:
    output:

*****************************************************************************/
static INT encodeExtendedData (HANDLE_PARAMETRIC_STEREO  hParametricStereo,
                               HANDLE_FDK_BITSTREAM hBitStream)
{
  INT extDataSize;
  INT payloadBits = 0;

  extDataSize = getSbrExtendedDataSize(hParametricStereo);


  if (extDataSize != 0) {
    INT maxExtSize = (1<<SI_SBR_EXTENSION_SIZE_BITS) - 1;
    INT writtenNoBits = 0; /* needed to byte align the extended data */

    payloadBits += FDKwriteBits (hBitStream, 1, SI_SBR_EXTENDED_DATA_BITS);
    FDK_ASSERT(extDataSize <= SBR_EXTENDED_DATA_MAX_CNT);

    if (extDataSize < maxExtSize) {
      payloadBits += FDKwriteBits (hBitStream, extDataSize, SI_SBR_EXTENSION_SIZE_BITS);
    } else {
      payloadBits += FDKwriteBits (hBitStream, maxExtSize, SI_SBR_EXTENSION_SIZE_BITS);
      payloadBits += FDKwriteBits (hBitStream, extDataSize - maxExtSize, SI_SBR_EXTENSION_ESC_COUNT_BITS);
    }

    /* parametric coding signalled here? */
    if(hParametricStereo){
      writtenNoBits += FDKwriteBits (hBitStream, EXTENSION_ID_PS_CODING, SI_SBR_EXTENSION_ID_BITS);
      writtenNoBits += FDKsbrEnc_PSEnc_WritePSData(hParametricStereo, hBitStream);
    }

    payloadBits += writtenNoBits;

    /* byte alignment */
    writtenNoBits = writtenNoBits%8;
    if(writtenNoBits)
      payloadBits += FDKwriteBits(hBitStream, 0, (8 - writtenNoBits));
  } else {
    payloadBits += FDKwriteBits (hBitStream, 0, SI_SBR_EXTENDED_DATA_BITS);
  }

  return payloadBits;
}


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

    functionname: writeSyntheticCodingData
    description:  writes bits corresponding to the "synthetic-coding"-extension
    returns:      number of bits written
    input:
    output:

*****************************************************************************/
static INT writeSyntheticCodingData (HANDLE_SBR_ENV_DATA  sbrEnvData,
                                     HANDLE_FDK_BITSTREAM hBitStream)

{
  INT i;
  INT payloadBits = 0;

  payloadBits += FDKwriteBits (hBitStream, sbrEnvData->addHarmonicFlag, 1);

  if (sbrEnvData->addHarmonicFlag) {
    for (i = 0; i < sbrEnvData->noHarmonics; i++) {
      payloadBits += FDKwriteBits (hBitStream, sbrEnvData->addHarmonic[i], 1);
    }
  }

  return payloadBits;
}

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

    functionname: getSbrExtendedDataSize
    description:  counts the number of bits needed for encoding the
                  extended data (including extension id)

    returns:      number of bits needed for the extended data
    input:
    output:

*****************************************************************************/
static INT
getSbrExtendedDataSize (HANDLE_PARAMETRIC_STEREO  hParametricStereo)
{
  INT extDataBits = 0;

  /* add your new extended data counting methods here */

  /*
    no extended data
  */

  if(hParametricStereo){
    /* PS extended data */
    extDataBits += SI_SBR_EXTENSION_ID_BITS;
    extDataBits += FDKsbrEnc_PSEnc_WritePSData(hParametricStereo, NULL);
  }

  return (extDataBits+7) >> 3;
}