Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5

1 files changed, 1001 insertions, 0 deletions

diff --git a/libSBRenc/src/bit_sbr.cpp b/libSBRenc/src/bit_sbr.cpp
new file mode 100644
index 0000000..4088c35
--- /dev/null
+++ b/libSBRenc/src/bit_sbr.cpp
@@ -0,0 +1,1001 @@
+/****************************************************************************
+
+                       (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;
+}
+
+
+
+
+