Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5

1 files changed, 749 insertions, 0 deletions

diff --git a/libSBRdec/src/sbrdec_freq_sca.cpp b/libSBRdec/src/sbrdec_freq_sca.cpp
new file mode 100644
index 0000000..f48c7d0
--- /dev/null
+++ b/libSBRdec/src/sbrdec_freq_sca.cpp
@@ -0,0 +1,749 @@
+/****************************************************************************
+
+                     (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  Frequency scale calculation $Revision: 36841 $
+*/
+
+#include "sbrdec_freq_sca.h"
+
+#include "transcendent.h"
+#include "sbr_rom.h"
+#include "env_extr.h"
+
+#include "genericStds.h"      /* need log() for debug-code only */
+
+#define MAX_OCTAVE         29
+#define MAX_SECOND_REGION  50
+
+
+static int  numberOfBands(FIXP_SGL bpo_div16, int start, int stop, int warpFlag);
+static void CalcBands(UCHAR * diff, UCHAR start, UCHAR stop, UCHAR num_bands);
+static SBR_ERROR modifyBands(UCHAR max_band, UCHAR * diff, UCHAR length);
+static void cumSum(UCHAR start_value, UCHAR* diff, UCHAR length, UCHAR *start_adress);
+
+
+
+/*!
+  \brief     Retrieve QMF-band where the SBR range starts
+
+  Convert startFreq which was read from the bitstream into a
+  QMF-channel number.
+
+  \return  Number of start band
+*/
+static UCHAR
+getStartBand(UINT   fs,               /*!< Output sampling frequency */
+             UCHAR  startFreq,        /*!< Index to table of possible start bands */
+             UINT   headerDataFlags)  /*!< Info to SBR mode */
+{
+  INT  band;
+  UINT fsMapped;
+
+    fsMapped = fs;
+
+  switch (fsMapped) {
+    case 48000:
+      band = FDK_sbrDecoder_sbr_start_freq_48[startFreq];
+      break;
+    case 44100:
+      band = FDK_sbrDecoder_sbr_start_freq_44[startFreq];
+      break;
+    case 32000:
+      band = FDK_sbrDecoder_sbr_start_freq_32[startFreq];
+      break;
+    case 24000:
+      band = FDK_sbrDecoder_sbr_start_freq_24[startFreq];
+      break;
+    case 22050:
+      band = FDK_sbrDecoder_sbr_start_freq_22[startFreq];
+      break;
+    case 16000:
+      band = FDK_sbrDecoder_sbr_start_freq_16[startFreq];
+      break;
+    default:
+      band = 255;
+  }
+
+  return band;
+}
+
+
+/*!
+  \brief     Retrieve QMF-band where the SBR range starts
+
+  Convert startFreq which was read from the bitstream into a
+  QMF-channel number.
+
+  \return  Number of start band
+*/
+static UCHAR
+getStopBand(UINT   fs,               /*!< Output sampling frequency */
+            UCHAR  stopFreq,         /*!< Index to table of possible start bands */
+            UINT   headerDataFlags,  /*!< Info to SBR mode */
+            UCHAR  k0)               /*!< Start freq index */
+{
+  UCHAR k2;
+
+  if (stopFreq < 14) {
+    INT    stopMin;
+    UCHAR  diff_tot[MAX_OCTAVE + MAX_SECOND_REGION];
+    UCHAR *diff0 = diff_tot;
+    UCHAR *diff1 = diff_tot+MAX_OCTAVE;
+
+    if (fs < 32000) {
+      stopMin = (((2*6000*2*(64)) / fs) + 1) >> 1;
+    }
+    else {
+      if (fs < 64000) {
+        stopMin = (((2*8000*2*(64)) / fs) + 1) >> 1;
+      }
+      else {
+        stopMin = (((2*10000*2*(64)) / fs) + 1) >> 1;
+      }
+    }
+
+    /*
+      Choose a stop band between k1 and 64 depending on stopFreq (0..13),
+      based on a logarithmic scale.
+      The vectors diff0 and diff1 are used temporarily here.
+    */
+    CalcBands( diff0, stopMin, 64, 13);
+    shellsort( diff0, 13);
+    cumSum(stopMin, diff0, 13, diff1);
+    k2 = diff1[stopFreq];
+  }
+  else if (stopFreq==14)
+    k2 = 2*k0;
+  else
+    k2 = 3*k0;
+
+  /* Limit to Nyquist */
+  if (k2 > (64))
+    k2 = (64);
+
+
+  /* Range checks */
+  /* 1 <= difference <= 48; 1 <= fs <= 96000 */
+  if ( ((k2 - k0) > MAX_FREQ_COEFFS) || (k2 <= k0) ) {
+    return 255;
+  }
+  
+  if (headerDataFlags & (SBRDEC_SYNTAX_USAC|SBRDEC_SYNTAX_RSVD50)) {
+    /* 1 <= difference <= 35; 42000 <= fs <= 96000 */  
+    if ( (fs >= 42000) && ( (k2 - k0) > MAX_FREQ_COEFFS_FS44100 ) ) {     
+      return 255;
+    }
+    /* 1 <= difference <= 32; 46009 <= fs <= 96000 */    
+    if ( (fs >= 46009) && ( (k2 - k0) > MAX_FREQ_COEFFS_FS48000 ) ) {
+      return 255;
+    }
+  }
+  else {
+    /* 1 <= difference <= 35; fs == 44100 */  
+    if ( (fs == 44100) && ( (k2 - k0) > MAX_FREQ_COEFFS_FS44100 ) ) { 
+      return 255;
+    }
+    /* 1 <= difference <= 32; 48000 <= fs <= 96000 */        
+    if ( (fs >= 48000) && ( (k2 - k0) > MAX_FREQ_COEFFS_FS48000 ) ) {
+      return 255;
+    }
+  }  
+
+  return k2;
+}
+
+
+/*!
+  \brief     Generates master frequency tables
+
+  Frequency tables are calculated according to the selected domain
+  (linear/logarithmic) and granularity.
+  IEC 14496-3 4.6.18.3.2.1
+
+  \return  errorCode, 0 if successful
+*/
+SBR_ERROR
+sbrdecUpdateFreqScale(UCHAR * v_k_master,    /*!< Master table to be created */
+                      UCHAR *numMaster,      /*!< Number of entries in master table */
+                      UINT   fs,             /*!< SBR working sampling rate */
+                      HANDLE_SBR_HEADER_DATA hHeaderData, /*!< Control data from bitstream */
+                      UINT flags)
+{
+  FIXP_SGL bpo_div16;        /* bands_per_octave divided by 16 */
+  INT      dk=0;
+
+  /* Internal variables */
+  UCHAR  k0, k2, i;
+  UCHAR  num_bands0 = 0;
+  UCHAR  num_bands1 = 0;
+  UCHAR  diff_tot[MAX_OCTAVE + MAX_SECOND_REGION];
+  UCHAR *diff0 = diff_tot;
+  UCHAR *diff1 = diff_tot+MAX_OCTAVE;
+  INT    k2_achived;
+  INT    k2_diff;
+  INT    incr=0;
+
+  /*
+    Determine start band
+  */
+  k0 = getStartBand(fs, hHeaderData->bs_data.startFreq, flags);
+  if (k0 == 255) {
+    return SBRDEC_UNSUPPORTED_CONFIG;
+  }
+
+  /*
+    Determine stop band
+  */
+  k2 = getStopBand(fs, hHeaderData->bs_data.stopFreq, flags, k0);
+  if (k2 == 255) {
+    return SBRDEC_UNSUPPORTED_CONFIG;
+  }
+
+  if(hHeaderData->bs_data.freqScale>0) { /* Bark */
+    INT k1;
+
+    if(hHeaderData->bs_data.freqScale==1) {
+      bpo_div16 = FL2FXCONST_SGL(12.0f/16.0f);
+    }
+    else if(hHeaderData->bs_data.freqScale==2) {
+      bpo_div16 = FL2FXCONST_SGL(10.0f/16.0f);
+    }
+    else {
+      bpo_div16 =  FL2FXCONST_SGL(8.0f/16.0f);
+    }
+
+
+    if( 1000 * k2 > 2245 * k0 ) { /* Two or more regions */
+      k1 = 2*k0;
+
+      num_bands0 = numberOfBands(bpo_div16, k0, k1, 0);
+      num_bands1 = numberOfBands(bpo_div16, k1, k2, hHeaderData->bs_data.alterScale );
+      if ( num_bands0 < 1) {
+        return SBRDEC_UNSUPPORTED_CONFIG;
+      }
+      if ( num_bands1 < 1 ) {
+        return SBRDEC_UNSUPPORTED_CONFIG;
+      }
+
+      CalcBands(diff0, k0, k1, num_bands0);
+      shellsort( diff0, num_bands0);
+      if (diff0[0] == 0) {
+#ifdef DEBUG_TOOLS
+#endif
+        return SBRDEC_UNSUPPORTED_CONFIG;
+      }
+
+      cumSum(k0, diff0, num_bands0, v_k_master);
+
+      CalcBands(diff1, k1, k2, num_bands1);
+      shellsort( diff1, num_bands1);
+      if(diff0[num_bands0-1] > diff1[0]) {
+        SBR_ERROR err;
+
+        err = modifyBands(diff0[num_bands0-1],diff1, num_bands1);
+        if (err)
+          return SBRDEC_UNSUPPORTED_CONFIG;
+      }
+
+      /* Add 2nd region */
+      cumSum(k1, diff1, num_bands1, &v_k_master[num_bands0]);
+      *numMaster = num_bands0 + num_bands1;     /* Output nr of bands */
+
+    }
+    else { /* Only one region */
+      k1=k2;
+
+      num_bands0 = numberOfBands(bpo_div16, k0, k1, 0);
+      if ( num_bands0 < 1) {
+        return SBRDEC_UNSUPPORTED_CONFIG;
+      }
+      CalcBands(diff0, k0, k1, num_bands0);
+      shellsort(diff0, num_bands0);
+      if (diff0[0] == 0) {
+#ifdef DEBUG_TOOLS
+#endif
+        return SBRDEC_UNSUPPORTED_CONFIG;
+      }
+
+      cumSum(k0, diff0, num_bands0, v_k_master);
+      *numMaster = num_bands0;        /* Output nr of bands */
+
+    }
+  }
+  else { /* Linear mode */
+     if (hHeaderData->bs_data.alterScale==0) {
+        dk = 1;
+        /* FLOOR to get to few number of bands (next lower even number) */
+        num_bands0 = (k2 - k0) & 254;
+      } else {
+        dk = 2;
+        num_bands0 = ( ((k2 - k0) >> 1) + 1 ) & 254; /* ROUND to the closest fit */
+      }
+
+      if (num_bands0 < 1) {
+        return SBRDEC_UNSUPPORTED_CONFIG;
+        /* We must return already here because 'i' can become negative below. */
+      }
+
+      k2_achived = k0 + num_bands0*dk;
+      k2_diff = k2 - k2_achived;
+
+      for(i=0;i<num_bands0;i++)
+        diff_tot[i] = dk;
+
+      /* If linear scale wasn't achieved */
+      /* and we got too wide SBR area */
+      if (k2_diff < 0) {
+          incr = 1;
+          i = 0;
+      }
+
+      /* If linear scale wasn't achieved */
+      /* and we got too small SBR area */
+      if (k2_diff > 0) {
+          incr = -1;
+          i = num_bands0-1;
+      }
+
+      /* Adjust diff vector to get sepc. SBR range */
+      while (k2_diff != 0) {
+        diff_tot[i] = diff_tot[i] - incr;
+        i = i + incr;
+        k2_diff = k2_diff + incr;
+      }
+
+      cumSum(k0, diff_tot, num_bands0, v_k_master);/* cumsum */
+    *numMaster = num_bands0;  /* Output nr of bands */
+  }
+
+  if (*numMaster < 1) {
+    return SBRDEC_UNSUPPORTED_CONFIG;
+  }
+
+
+  /*
+    Print out the calculated table
+  */
+
+  return SBRDEC_OK;
+}
+
+
+/*!
+  \brief     Calculate frequency ratio of one SBR band
+
+  All SBR bands should span a constant frequency range in the logarithmic
+  domain. This function calculates the ratio of any SBR band's upper and lower
+  frequency.
+
+ \return    num_band-th root of k_start/k_stop
+*/
+static FIXP_SGL calcFactorPerBand(int k_start, int k_stop, int num_bands)
+{
+/* Changes CT fract class -> IIS fract class:
+ * scaled bandfactor and step 1 bit right to avoid overflow
+ * use CTdbouble data type */
+  FIXP_DBL bandfactor = FL2FXCONST_DBL(0.25f); /* Start value */
+  FIXP_DBL step = FL2FXCONST_DBL(0.125f);      /* Initial increment for factor */
+
+  int    direction = 1;
+
+/* Changes CT fract class -> IIS fract class:
+ * because saturation can't be done in INT IIS,
+ * changed start and stop data type from FIXP_SGL to FIXP_DBL */
+  FIXP_DBL start = k_start << (DFRACT_BITS-8);
+  FIXP_DBL stop = k_stop << (DFRACT_BITS-8);
+
+  FIXP_DBL temp;
+
+  int   j, i=0;
+
+  while ( step > FL2FXCONST_DBL(0.0f)) {
+    i++;
+    temp = stop;
+
+    /* Calculate temp^num_bands: */
+    for (j=0; j<num_bands; j++)
+      //temp = fMult(temp,bandfactor);
+      temp = fMultDiv2(temp,bandfactor)<<2;
+
+    if (temp<start) { /* Factor too strong, make it weaker */
+      if (direction == 0)
+        /* Halfen step. Right shift is not done as fract because otherwise the
+           lowest bit cannot be cleared due to rounding */
+        step = (FIXP_DBL)((LONG)step >> 1);
+      direction = 1;
+      bandfactor = bandfactor + step;
+    }
+    else {  /* Factor is too weak: make it stronger */
+      if (direction == 1)
+        step = (FIXP_DBL)((LONG)step >> 1);
+      direction = 0;
+      bandfactor = bandfactor - step;
+    }
+
+    if (i>100) {
+      step = FL2FXCONST_DBL(0.0f);
+    }
+  }
+  return FX_DBL2FX_SGL(bandfactor<<1);
+}
+
+
+/*!
+  \brief     Calculate number of SBR bands between start and stop band
+
+  Given the number of bands per octave, this function calculates how many
+  bands fit in the given frequency range.
+  When the warpFlag is set, the 'band density' is decreased by a factor
+  of 1/1.3
+
+  \return    number of bands
+*/
+static int
+numberOfBands(FIXP_SGL bpo_div16, /*!< Input: number of bands per octave divided by 16 */
+              int    start,     /*!< First QMF band of SBR frequency range */
+              int    stop,      /*!< Last QMF band of SBR frequency range + 1 */
+              int    warpFlag)  /*!< Stretching flag */
+{
+  FIXP_SGL num_bands_div128;
+  int    num_bands;
+
+  num_bands_div128 = FX_DBL2FX_SGL(fMult(FDK_getNumOctavesDiv8(start,stop),bpo_div16));
+
+  if (warpFlag) {
+    /* Apply the warp factor of 1.3 to get wider bands.  We use a value
+       of 32768/25200 instead of the exact value to avoid critical cases
+       of rounding.
+    */
+    num_bands_div128 = FX_DBL2FX_SGL(fMult(num_bands_div128, FL2FXCONST_SGL(25200.0/32768.0)));
+  }
+
+  /* add scaled 1 for rounding to even numbers: */
+  num_bands_div128 = num_bands_div128 + FL2FXCONST_SGL( 1.0f/128.0f );
+  /* scale back to right aligned integer and double the value: */
+  num_bands = 2 * ((LONG)num_bands_div128 >> (FRACT_BITS - 7));
+
+  return(num_bands);
+}
+
+
+/*!
+  \brief     Calculate width of SBR bands
+
+  Given the desired number of bands within the SBR frequency range,
+  this function calculates the width of each SBR band in QMF channels.
+  The bands get wider from start to stop (bark scale).
+*/
+static void
+CalcBands(UCHAR * diff,    /*!< Vector of widths to be calculated */
+          UCHAR start,     /*!< Lower end of subband range */
+          UCHAR stop,      /*!< Upper end of subband range */
+          UCHAR num_bands) /*!< Desired number of bands */
+{
+  int i;
+  int previous;
+  int current;
+  FIXP_SGL exact, temp;
+  FIXP_SGL bandfactor = calcFactorPerBand(start, stop, num_bands);
+
+  previous = stop; /* Start with highest QMF channel */
+  exact = (FIXP_SGL)(stop << (FRACT_BITS-8)); /* Shift left to gain some accuracy */
+
+  for(i=num_bands-1; i>=0; i--) {
+    /* Calculate border of next lower sbr band */
+    exact = FX_DBL2FX_SGL(fMult(exact,bandfactor));
+
+    /* Add scaled 0.5 for rounding:
+       We use a value 128/256 instead of 0.5 to avoid some critical cases of rounding. */
+    temp = exact +  FL2FXCONST_SGL(128.0/32768.0);
+
+    /* scale back to right alinged integer: */
+    current = (LONG)temp >> (FRACT_BITS-8);
+
+    /* Save width of band i */
+    diff[i] = previous - current;
+    previous = current;
+  }
+}
+
+
+/*!
+  \brief     Calculate cumulated sum vector from delta vector
+*/
+static void
+cumSum(UCHAR start_value, UCHAR* diff, UCHAR length, UCHAR *start_adress)
+{
+  int i;
+  start_adress[0]=start_value;
+  for(i=1; i<=length; i++)
+    start_adress[i] = start_adress[i-1] + diff[i-1];
+}
+
+
+/*!
+  \brief     Adapt width of frequency bands in the second region
+
+  If SBR spans more than 2 octaves, the upper part of a bark-frequency-scale
+  is calculated separately. This function tries to avoid that the second region
+  starts with a band smaller than the highest band of the first region.
+*/
+static SBR_ERROR
+modifyBands(UCHAR max_band_previous, UCHAR * diff, UCHAR length)
+{
+  int change = max_band_previous - diff[0];
+
+  /* Limit the change so that the last band cannot get narrower than the first one */
+  if ( change > (diff[length-1]-diff[0])>>1 )
+    change = (diff[length-1]-diff[0])>>1;
+
+  diff[0] += change;
+  diff[length-1] -= change;
+  shellsort(diff, length);
+
+  return SBRDEC_OK;
+}
+
+
+/*!
+  \brief   Update high resolution frequency band table
+*/
+static void
+sbrdecUpdateHiRes(UCHAR * h_hires,
+                  UCHAR * num_hires,
+                  UCHAR * v_k_master,
+                  UCHAR num_bands,
+                  UCHAR xover_band)
+{
+  UCHAR i;
+
+  *num_hires = num_bands-xover_band;
+
+  for(i=xover_band; i<=num_bands; i++) {
+    h_hires[i-xover_band] = v_k_master[i];
+  }
+}
+
+
+/*!
+  \brief  Build low resolution table out of high resolution table
+*/
+static void
+sbrdecUpdateLoRes(UCHAR * h_lores,
+                  UCHAR * num_lores,
+                  UCHAR * h_hires,
+                  UCHAR num_hires)
+{
+  UCHAR i;
+
+  if( (num_hires & 1) == 0) {
+    /* If even number of hires bands */
+    *num_lores = num_hires >> 1;
+    /* Use every second lores=hires[0,2,4...] */
+    for(i=0; i<=*num_lores; i++)
+      h_lores[i] = h_hires[i*2];
+  }
+  else {
+    /* Odd number of hires, which means xover is odd */
+    *num_lores = (num_hires+1) >> 1;
+    /* Use lores=hires[0,1,3,5 ...] */
+    h_lores[0] = h_hires[0];
+    for(i=1; i<=*num_lores; i++) {
+      h_lores[i] = h_hires[i*2-1];
+    }
+  }
+}
+
+
+/*!
+  \brief   Derive a low-resolution frequency-table from the master frequency table
+*/
+void
+sbrdecDownSampleLoRes(UCHAR *v_result,
+                      UCHAR num_result,
+                      UCHAR *freqBandTableRef,
+                      UCHAR num_Ref)
+{
+  int step;
+  int i,j;
+  int org_length,result_length;
+  int v_index[MAX_FREQ_COEFFS>>1];
+
+  /* init */
+  org_length = num_Ref;
+  result_length = num_result;
+
+  v_index[0] = 0;   /* Always use left border */
+  i=0;
+  while(org_length > 0) {
+    /* Create downsample vector */
+    i++;
+    step = org_length / result_length;
+    org_length = org_length - step;
+    result_length--;
+    v_index[i] = v_index[i-1] + step;
+  }
+
+  for(j=0;j<=i;j++) {
+    /* Use downsample vector to index LoResolution vector */
+    v_result[j]=freqBandTableRef[v_index[j]];
+  }
+
+}
+
+
+/*!
+  \brief   Sorting routine
+*/
+void shellsort(UCHAR *in, UCHAR n)
+{
+
+  int i, j, v, w;
+  int inc = 1;
+
+  do
+    inc = 3 * inc + 1;
+  while (inc <= n);
+
+  do {
+    inc = inc / 3;
+    for (i = inc; i < n; i++) {
+      v = in[i];
+      j = i;
+      while ((w=in[j-inc]) > v) {
+        in[j] = w;
+        j -= inc;
+        if (j < inc)
+          break;
+      }
+      in[j] = v;
+    }
+  } while (inc > 1);
+
+}
+
+
+
+/*!
+  \brief   Reset frequency band tables
+  \return  errorCode, 0 if successful
+*/
+SBR_ERROR
+resetFreqBandTables(HANDLE_SBR_HEADER_DATA hHeaderData, const UINT flags)
+{
+  SBR_ERROR err = SBRDEC_OK;
+  int k2,kx, lsb, usb;
+  int     intTemp;
+  UCHAR    nBandsLo, nBandsHi;
+  HANDLE_FREQ_BAND_DATA hFreq = &hHeaderData->freqBandData;
+
+  /* Calculate master frequency function */
+  err = sbrdecUpdateFreqScale(hFreq->v_k_master,
+                              &hFreq->numMaster,
+                              hHeaderData->sbrProcSmplRate,
+                              hHeaderData,
+                              flags);
+
+  if ( err || (hHeaderData->bs_info.xover_band > hFreq->numMaster) ) {
+    return SBRDEC_UNSUPPORTED_CONFIG;
+  }
+
+  /* Derive Hiresolution from master frequency function */
+  sbrdecUpdateHiRes(hFreq->freqBandTable[1], &nBandsHi, hFreq->v_k_master, hFreq->numMaster, hHeaderData->bs_info.xover_band );
+  /* Derive Loresolution from Hiresolution */
+  sbrdecUpdateLoRes(hFreq->freqBandTable[0], &nBandsLo, hFreq->freqBandTable[1], nBandsHi);
+
+
+  hFreq->nSfb[0] = nBandsLo;
+  hFreq->nSfb[1] = nBandsHi;
+
+  /* Check index to freqBandTable[0] */
+  if ( !(nBandsLo > 0) || (nBandsLo > (MAX_FREQ_COEFFS>>1)) ) {
+    return SBRDEC_UNSUPPORTED_CONFIG;
+  }
+
+  lsb = hFreq->freqBandTable[0][0];
+  usb = hFreq->freqBandTable[0][nBandsLo];
+
+  /* Additional check for lsb */
+  if ( (lsb > (32)) || (lsb >= usb) ) {
+    return SBRDEC_UNSUPPORTED_CONFIG;
+  }
+
+
+  /* Calculate number of noise bands */
+
+  k2 = hFreq->freqBandTable[1][nBandsHi];
+  kx = hFreq->freqBandTable[1][0];
+
+  if (hHeaderData->bs_data.noise_bands == 0)
+  {
+    hFreq->nNfb = 1;
+  }
+  else /* Calculate no of noise bands 1,2 or 3 bands/octave */
+  {
+    /* Fetch number of octaves divided by 32 */
+    intTemp = (LONG)FDK_getNumOctavesDiv8(kx,k2) >> 2;
+
+    /* Integer-Multiplication with number of bands: */
+    intTemp = intTemp * hHeaderData->bs_data.noise_bands;
+
+    /* Add scaled 0.5 for rounding: */
+    intTemp = intTemp + (LONG)FL2FXCONST_SGL(0.5f/32.0f);
+
+    /* Convert to right-aligned integer: */
+    intTemp = intTemp >> (FRACT_BITS - 1 /*sign*/ - 5 /* rescale */);
+
+    /* Compare with float calculation */
+    FDK_ASSERT( intTemp ==  (int)((hHeaderData->bs_data.noise_bands * FDKlog( (float)k2/kx) / (float)(FDKlog(2.0)))+0.5) );
+
+    if( intTemp==0)
+      intTemp=1;
+
+    hFreq->nNfb = intTemp;
+  }
+
+  hFreq->nInvfBands = hFreq->nNfb;
+
+  if( hFreq->nNfb > MAX_NOISE_COEFFS ) {
+    return SBRDEC_UNSUPPORTED_CONFIG;
+  }
+
+  /* Get noise bands */
+  sbrdecDownSampleLoRes(hFreq->freqBandTableNoise,
+                        hFreq->nNfb,
+                        hFreq->freqBandTable[0],
+                        nBandsLo);
+
+
+
+
+  hFreq->lowSubband  = lsb;
+  hFreq->highSubband = usb;
+
+  return SBRDEC_OK;
+}