xref: /external/aac/libSBRenc/src/bit_sbr.cpp

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

� Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur F�rderung 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
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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."

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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
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or business interruption, however caused and on any theory of liability, whether in contract, strict
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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
----------------------------------------------------------------------------------------------------------- */

/*!
  \file
  \brief  SBR bit writing routines
*/


#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;
}