AAC/SBR encoder improvements

* AAC-Encoder

  - AAC-ELD core encoder audio quality tuning. Update tuning tables, configure
    bitreservoir size and adapt afterburner iteration value.
     Modified file(s):
        libAACenc/src/aacenc.h
        libAACenc/src/aacenc_lib.cpp
        libAACenc/src/adj_thr.cpp
        libAACenc/src/adj_thr.h
        libAACenc/src/adj_thr_data.h
        libAACenc/src/bandwidth.cpp
        libAACenc/src/pnsparam.cpp
        libAACenc/src/qc_main.cpp

   - Introduze dead zone quantizer for ELD to improve audio quality at certain
     configurations.
     Modified file(s):
        libAACenc/src/aacenc_lib.cpp
        libAACenc/src/adj_thr.cpp
        libAACenc/src/adj_thr.h
        libAACenc/src/qc_data.h
        libAACenc/src/qc_main.cpp
        libAACenc/src/quantize.cpp
        libAACenc/src/quantize.h
        libAACenc/src/sf_estim.cpp
        libAACenc/src/sf_estim.h

   - Revise TNS module to improve ELD audio quality.
   - Use new window function and separate prediction gain according TNS filters.
   - Add missing memory initilization to TNS configuration.
     Modified file(s):
        libAACenc/src/aacenc_lib.cpp
        libAACenc/src/aacenc_tns.cpp
        libAACenc/src/aacenc_tns.h
        libAACenc/src/psy_main.cpp
        libAACenc/src/tns_func.h

* SBR-Encoder

   - Revise frequency resolution calculation and handle differently depending
     on number of envelopes and split frames decision.
   - Add and adjust ELD SBR tuning tables.
     Modified file(s):
        libSBRenc/include/sbr_encoder.h
        libSBRenc/src/bit_sbr.h
        libSBRenc/src/env_est.cpp
        libSBRenc/src/fram_gen.cpp
        libSBRenc/src/fram_gen.h
        libSBRenc/src/mh_det.cpp
        libSBRenc/src/sbr_def.h
        libSBRenc/src/sbr_encoder.cpp
        libSBRenc/src/sbr_rom.cpp
        libSBRenc/src/tran_det.cpp

   - Replace ELD transient detector with fast implementation.
     Modified file(s):
        libSBRenc/src/env_est.cpp
        libSBRenc/src/env_est.h
        libSBRenc/src/fram_gen.cpp
        libSBRenc/src/sbr_def.h
        libSBRenc/src/sbr_encoder.cpp
        libSBRenc/src/tran_det.cpp
        libSBRenc/src/tran_det.h

* FDK-Library
   - Introduce generic compare function in tools library.
     Modified file(s):
        libFDK/include/fixpoint_math.h
        libFDK/src/FDK_core.cpp

* SBR-Encoder

  -  Revise ELD frame splitter to improve bit distribution.
     Modified file(s):
        libSBRenc/include/sbr_encoder.h
        libSBRenc/src/bit_sbr.h
        libSBRenc/src/env_est.cpp
        libSBRenc/src/fram_gen.cpp
        libSBRenc/src/fram_gen.h
        libSBRenc/src/sbr_encoder.cpp
        libSBRenc/src/tran_det.cpp
        libSBRenc/src/tran_det.h

   - Configure amplitude resolution according the tonality of the audio signal.
     Modified file(s):
        libSBRenc/include/sbr_encoder.h
        libSBRenc/src/bit_sbr.h
        libSBRenc/src/env_est.cpp
        libSBRenc/src/nf_est.cpp
        libSBRenc/src/nf_est.h
        libSBRenc/src/sbr_def.h
        libSBRenc/src/sbr_encoder.cpp
        libSBRenc/src/ton_corr.cpp
        libSBRenc/src/ton_corr.h
        libSBRenc/src/tran_det.cpp
        libSBRenc/src/tran_det.h

Change-Id: Ie0672b989a06ee63b50240616b8d1d4b790b6cb2

17 files changed, 281 insertions, 168 deletions

diff --git a/libAACenc/src/aacenc.h b/libAACenc/src/aacenc.h
index 61520de..79524b5 100644
--- a/libAACenc/src/aacenc.h
+++ b/libAACenc/src/aacenc.h
@@ -98,6 +98,11 @@ amm-info@iis.fraunhofer.de
 
 #include "sbr_encoder.h"
 
+#define BITRES_MAX_LD   4000
+#define BITRES_MIN_LD    500
+#define BITRATE_MAX_LD 70000 /* Max assumed bitrate for bitres calculation */
+#define BITRATE_MIN_LD 12000 /* Min assumed bitrate for bitres calculation */
+
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/libAACenc/src/aacenc_lib.cpp b/libAACenc/src/aacenc_lib.cpp
index 9a3b214..2845177 100644
--- a/libAACenc/src/aacenc_lib.cpp
+++ b/libAACenc/src/aacenc_lib.cpp
@@ -98,7 +98,7 @@ amm-info@iis.fraunhofer.de
 /* Encoder library info */
 #define AACENCODER_LIB_VL0 3
 #define AACENCODER_LIB_VL1 4
-#define AACENCODER_LIB_VL2 19
+#define AACENCODER_LIB_VL2 22
 #define AACENCODER_LIB_TITLE "AAC Encoder"
 #ifdef __ANDROID__
 #define AACENCODER_LIB_BUILD_DATE ""
@@ -813,11 +813,16 @@ AACENC_ERROR FDKaacEnc_AdjustEncSettings(HANDLE_AACENCODER hAacEncoder,
     switch ( hAacConfig->audioObjectType ) {
       case AOT_ER_AAC_LD:
       case AOT_ER_AAC_ELD:
-        if (config->userBitrateMode==8) {
-          hAacConfig->bitrateMode = 0;
-        }
         if (config->userBitrateMode==0) {
-          hAacConfig->bitreservoir = 100*config->nChannels; /* default, reduced bitreservoir */
+          /* bitreservoir  = (maxBitRes-minBitRes)/(maxBitRate-minBitrate)*(bitRate-minBitrate)+minBitRes; */
+          if ( isLowDelay(hAacConfig->audioObjectType) ) {
+            INT bitreservoir;
+            INT brPerChannel = hAacConfig->bitRate/hAacConfig->nChannels;
+            brPerChannel     = fMin(BITRATE_MAX_LD, fMax(BITRATE_MIN_LD, brPerChannel));
+            FIXP_DBL slope   = fDivNorm((brPerChannel-BITRATE_MIN_LD), BITRATE_MAX_LD-BITRATE_MIN_LD); /* calc slope for interpolation */
+            bitreservoir     = fMultI(slope, (INT)(BITRES_MAX_LD-BITRES_MIN_LD)) + BITRES_MIN_LD; /* interpolate */
+            hAacConfig->bitreservoir = bitreservoir & ~7; /* align to bytes */
+          }
         }
         if (hAacConfig->bitrateMode!=0) {
           return AACENC_INVALID_CONFIG;
diff --git a/libAACenc/src/aacenc_tns.cpp b/libAACenc/src/aacenc_tns.cpp
index 85aea65..9a07e8f 100644
--- a/libAACenc/src/aacenc_tns.cpp
+++ b/libAACenc/src/aacenc_tns.cpp
@@ -2,7 +2,7 @@
 /* -----------------------------------------------------------------------------------------------------------
 Software License for The Fraunhofer FDK AAC Codec Library for Android
 
-© Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+© Copyright  1995 - 2015 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
   All rights reserved.
 
  1.    INTRODUCTION
@@ -95,13 +95,7 @@ amm-info@iis.fraunhofer.de
 #include "aacEnc_rom.h"
 #include "aacenc_tns.h"
 
-enum {
-    HIFILT = 0, /* index of higher filter */
-    LOFILT = 1 /* index of lower filter */
-};
-
-
-#define FILTER_DIRECTION 0
+#define FILTER_DIRECTION 0 /* 0 = up, 1 = down */
 
 static const FIXP_DBL acfWindowLong[12+3+1] = {
   0x7fffffff,0x7fb80000,0x7ee00000,0x7d780000,0x7b800000,0x78f80000,0x75e00000,0x72380000,
@@ -112,20 +106,6 @@ static const FIXP_DBL acfWindowShort[4+3+1] = {
   0x7fffffff,0x7e000000,0x78000000,0x6e000000,0x60000000,0x4e000000,0x38000000,0x1e000000
 };
 
-
-typedef struct {
-  INT      filterEnabled[MAX_NUM_OF_FILTERS];
-  INT      threshOn[MAX_NUM_OF_FILTERS];                /* min. prediction gain for using tns TABUL*/
-  INT      filterStartFreq[MAX_NUM_OF_FILTERS];         /* lowest freq for lpc TABUL*/
-  INT      tnsLimitOrder[MAX_NUM_OF_FILTERS];           /* Limit for TNS order TABUL*/
-  INT      tnsFilterDirection[MAX_NUM_OF_FILTERS];      /* Filtering direction, 0=up, 1=down TABUL */
-  INT      acfSplit[MAX_NUM_OF_FILTERS];
-  FIXP_DBL tnsTimeResolution[MAX_NUM_OF_FILTERS];       /* TNS max. time resolution TABUL. Should be fract but MSVC won't compile then */
-  INT      seperateFiltersAllowed;
-
-} TNS_PARAMETER_TABULATED;
-
-
 typedef struct{
   INT                      bitRateFrom[2];  /* noneSbr=0, useSbr=1 */
   INT                      bitRateTo[2];    /* noneSbr=0, useSbr=1 */
@@ -373,6 +353,7 @@ AAC_ENCODER_ERROR FDKaacEnc_InitTnsConfiguration(INT bitRate,
                                                  INT channels,
                                                  INT blockType,
                                                  INT granuleLength,
+                                                 INT isLowDelay,
                                                  INT ldSbrPresent,
                                                  TNS_CONFIG *tC,
                                                  PSY_CONFIGURATION *pC,
@@ -385,6 +366,8 @@ AAC_ENCODER_ERROR FDKaacEnc_InitTnsConfiguration(INT bitRate,
   if (channels <= 0)
     return (AAC_ENCODER_ERROR)1;
 
+  tC->isLowDelay = isLowDelay;
+
   /* initialize TNS filter flag, order, and coefficient resolution (in bits per coeff) */
   tC->tnsActive      = (active) ? TRUE : FALSE;
   tC->maxOrder       = (blockType == SHORT_WINDOW) ? 5 : 12;  /* maximum: 7, 20 */
@@ -450,27 +433,14 @@ AAC_ENCODER_ERROR FDKaacEnc_InitTnsConfiguration(INT bitRate,
         const TNS_PARAMETER_TABULATED* pCfg = FDKaacEnc_GetTnsParam(bitRate, channels, ldSbrPresent);
 
         if ( pCfg != NULL ) {
+
+          FDKmemcpy(&(tC->confTab), pCfg, sizeof(tC->confTab));
+
           tC->lpcStartBand[HIFILT]         = FDKaacEnc_FreqToBandWithRounding(pCfg->filterStartFreq[HIFILT], sampleRate, pC->sfbCnt, pC->sfbOffset);
           tC->lpcStartLine[HIFILT]         = pC->sfbOffset[tC->lpcStartBand[HIFILT]];
           tC->lpcStartBand[LOFILT]         = FDKaacEnc_FreqToBandWithRounding(pCfg->filterStartFreq[LOFILT], sampleRate, pC->sfbCnt, pC->sfbOffset);
           tC->lpcStartLine[LOFILT]         = pC->sfbOffset[tC->lpcStartBand[LOFILT]];
 
-          tC->confTab.threshOn[HIFILT] = pCfg->threshOn[HIFILT];
-          tC->confTab.threshOn[LOFILT] = pCfg->threshOn[LOFILT];
-
-          tC->confTab.tnsLimitOrder[HIFILT] = pCfg->tnsLimitOrder[HIFILT];
-          tC->confTab.tnsLimitOrder[LOFILT] = pCfg->tnsLimitOrder[LOFILT];
-
-          tC->confTab.tnsFilterDirection[HIFILT] = pCfg->tnsFilterDirection[HIFILT];
-          tC->confTab.tnsFilterDirection[LOFILT] = pCfg->tnsFilterDirection[LOFILT];
-
-          tC->confTab.acfSplit[HIFILT] = pCfg->acfSplit[HIFILT];
-          tC->confTab.acfSplit[LOFILT] = pCfg->acfSplit[LOFILT];
-
-          tC->confTab.filterEnabled[HIFILT] = pCfg->filterEnabled[HIFILT];
-          tC->confTab.filterEnabled[LOFILT] = pCfg->filterEnabled[LOFILT];
-          tC->confTab.seperateFiltersAllowed = pCfg->seperateFiltersAllowed;
-
           FDKaacEnc_CalcGaussWindow(tC->acfWindow[HIFILT], tC->maxOrder+1, sampleRate, granuleLength, pCfg->tnsTimeResolution[HIFILT], TNS_TIMERES_SCALE);
           FDKaacEnc_CalcGaussWindow(tC->acfWindow[LOFILT], tC->maxOrder+1, sampleRate, granuleLength, pCfg->tnsTimeResolution[LOFILT], TNS_TIMERES_SCALE);
         }
@@ -614,6 +584,7 @@ static inline FIXP_DBL FDKaacEnc_AutoCorrNormFac(
 
 static void FDKaacEnc_MergedAutoCorrelation(
         const FIXP_DBL           *spectrum,
+        const INT                 isLowDelay,
         const FIXP_DBL            acfWindow[MAX_NUM_OF_FILTERS][TNS_MAX_ORDER+3+1],
         const INT                 lpcStartLine[MAX_NUM_OF_FILTERS],
         const INT                 lpcStopLine,
@@ -633,6 +604,8 @@ static void FDKaacEnc_MergedAutoCorrelation(
     FDKmemclear(&_rxx1[0], sizeof(FIXP_DBL)*(maxOrder+1));
     FDKmemclear(&_rxx2[0], sizeof(FIXP_DBL)*(maxOrder+1));
 
+    idx0 = idx1 = idx2 = idx3 = idx4 = 0;
+
     /* MDCT line indices separating the 1st, 2nd, 3rd, and 4th analysis quarters */
     if ( (acfSplit[LOFILT]==-1) || (acfSplit[HIFILT]==-1) ) {
       /* autocorrelation function for 1st, 2nd, 3rd, and 4th quarter of the spectrum */
@@ -676,17 +649,27 @@ static void FDKaacEnc_MergedAutoCorrelation(
     /* compute energy normalization factors, i. e. 1/energy (saves some divisions) */
     if (rxx1_0 != FL2FXCONST_DBL(0.f))
     {
-        INT sc_fac1 = -1;
-        FIXP_DBL fac1 = FDKaacEnc_AutoCorrNormFac(rxx1_0, ((-2*sc1)+nsc1), &sc_fac1);
-        _rxx1[0] = scaleValue(fMult(rxx1_0,fac1),sc_fac1);
+      INT sc_fac1 = -1;
+      FIXP_DBL fac1 = FDKaacEnc_AutoCorrNormFac(rxx1_0, ((-2*sc1)+nsc1), &sc_fac1);
+      _rxx1[0] = scaleValue(fMult(rxx1_0,fac1),sc_fac1);
 
+      if (isLowDelay)
+      {
         for (lag = 1; lag <= maxOrder; lag++) {
           /* compute energy-normalized and windowed autocorrelation values at this lag */
+          FIXP_DBL x1 = FDKaacEnc_CalcAutoCorrValue(pSpectrum, idx0, idx1, lag, nsc1);
+          _rxx1[lag] = fMult(scaleValue(fMult(x1,fac1),sc_fac1), acfWindow[LOFILT][lag]);
+        }
+      }
+      else
+      {
+        for (lag = 1; lag <= maxOrder; lag++) {
           if ((3 * lag) <= maxOrder + 3) {
               FIXP_DBL x1 = FDKaacEnc_CalcAutoCorrValue(pSpectrum, idx0, idx1, lag, nsc1);
               _rxx1[lag] = fMult(scaleValue(fMult(x1,fac1),sc_fac1), acfWindow[LOFILT][3*lag]);
           }
         }
+      }
     }
 
     /* auto corr over upper 3/4 of spectrum */
@@ -762,8 +745,12 @@ INT FDKaacEnc_TnsDetect(
     : &tnsData->dataRaw.Long.subBlockInfo;
 
   tnsData->filtersMerged  = FALSE;
-  tsbi->tnsActive         = FALSE;
-  tsbi->predictionGain    = 1000;
+
+  tsbi->tnsActive[HIFILT]         = FALSE;
+  tsbi->predictionGain[HIFILT]    = 1000;
+  tsbi->tnsActive[LOFILT]         = FALSE;
+  tsbi->predictionGain[LOFILT]    = 1000;
+
   tnsInfo->numOfFilters[subBlockNumber] = 0;
   tnsInfo->coefRes[subBlockNumber]      = tC->coefRes;
   for (i = 0; i < tC->maxOrder; i++) {
@@ -779,6 +766,7 @@ INT FDKaacEnc_TnsDetect(
 
     FDKaacEnc_MergedAutoCorrelation(
           spectrum,
+          tC->isLowDelay,
           tC->acfWindow,
           tC->lpcStartLine,
           tC->lpcStopLine,
@@ -788,7 +776,7 @@ INT FDKaacEnc_TnsDetect(
           rxx2);
 
     /* compute higher TNS filter in lattice (ParCor) form with LeRoux-Gueguen algorithm */
-    tsbi->predictionGain = FDKaacEnc_AutoToParcor(rxx2, parcor_tmp, tC->confTab.tnsLimitOrder[HIFILT]);
+    tsbi->predictionGain[HIFILT] = FDKaacEnc_AutoToParcor(rxx2, parcor_tmp, tC->confTab.tnsLimitOrder[HIFILT]);
 
     /* non-linear quantization of TNS lattice coefficients with given resolution */
     FDKaacEnc_Parcor2Index(
@@ -815,9 +803,9 @@ INT FDKaacEnc_TnsDetect(
     tnsInfo->length[subBlockNumber][HIFILT] = sfbCnt - tC->lpcStartBand[HIFILT];
 
     /* disable TNS if predictionGain is less than 3dB or sumSqrCoef is too small */
-    if ((tsbi->predictionGain > tC->confTab.threshOn[HIFILT]) || (sumSqrCoef > (tC->confTab.tnsLimitOrder[HIFILT]/2 + 2)))
+    if ((tsbi->predictionGain[HIFILT] > tC->confTab.threshOn[HIFILT]) || (sumSqrCoef > (tC->confTab.tnsLimitOrder[HIFILT]/2 + 2)))
     {
-      tsbi->tnsActive = TRUE;
+      tsbi->tnsActive[HIFILT] = TRUE;
       tnsInfo->numOfFilters[subBlockNumber]++;
 
       /* compute second filter for lower quarter; only allowed for long windows! */
@@ -857,6 +845,7 @@ INT FDKaacEnc_TnsDetect(
           || ( (sumSqrCoef > 9)  && (sumSqrCoef < 22 * tC->confTab.tnsLimitOrder[LOFILT]) ) )
         {
           /* compare lower to upper filter; if they are very similar, merge them */
+          tsbi->tnsActive[LOFILT] = TRUE;
           sumSqrCoef = 0;
           for (i = 0; i < tC->confTab.tnsLimitOrder[LOFILT]; i++) {
             sumSqrCoef += FDKabs(tnsInfo->coef[subBlockNumber][HIFILT][i] - tnsInfo->coef[subBlockNumber][LOFILT][i]);
@@ -884,6 +873,8 @@ INT FDKaacEnc_TnsDetect(
             tnsInfo->numOfFilters[subBlockNumber]++;
           }
         } /* filter lower part */
+        tsbi->predictionGain[LOFILT]=predGain;
+
       } /* second filter allowed  */
     } /* if predictionGain > 1437 ... */
   } /* maxOrder > 0 && tnsActive */
@@ -944,7 +935,7 @@ void FDKaacEnc_TnsSync(
       INT doSync = 1, absDiffSum = 0;
 
       /* if TNS is active in at least one channel, check if ParCor coefficients of higher filter are similar */
-      if (pSbInfoDestW->tnsActive || pSbInfoSrcW->tnsActive) {
+      if (pSbInfoDestW->tnsActive[HIFILT] || pSbInfoSrcW->tnsActive[HIFILT]) {
         for (i = 0; i < tC->maxOrder; i++) {
           absDiff = FDKabs(tnsInfoDest->coef[w][HIFILT][i] - tnsInfoSrc->coef[w][HIFILT][i]);
           absDiffSum += absDiff;
@@ -957,12 +948,12 @@ void FDKaacEnc_TnsSync(
 
         if (doSync) {
             /* if no significant difference was detected, synchronize coefficient sets */
-            if (pSbInfoSrcW->tnsActive) {
+            if (pSbInfoSrcW->tnsActive[HIFILT]) {
               /* no dest filter, or more dest than source filters: use one dest filter */
-              if ((!pSbInfoDestW->tnsActive) ||
-                  ((pSbInfoDestW->tnsActive) && (tnsInfoDest->numOfFilters[w] > tnsInfoSrc->numOfFilters[w])))
+              if ((!pSbInfoDestW->tnsActive[HIFILT]) ||
+                  ((pSbInfoDestW->tnsActive[HIFILT]) && (tnsInfoDest->numOfFilters[w] > tnsInfoSrc->numOfFilters[w])))
               {
-                pSbInfoDestW->tnsActive = tnsInfoDest->numOfFilters[w] = 1;
+                pSbInfoDestW->tnsActive[HIFILT] = tnsInfoDest->numOfFilters[w] = 1;
               }
               tnsDataDest->filtersMerged = tnsDataSrc->filtersMerged;
               tnsInfoDest->order       [w][HIFILT] = tnsInfoSrc->order       [w][HIFILT];
@@ -975,7 +966,7 @@ void FDKaacEnc_TnsSync(
               }
             }
             else
-              pSbInfoDestW->tnsActive = tnsInfoDest->numOfFilters[w] = 0;
+              pSbInfoDestW->tnsActive[HIFILT] = tnsInfoDest->numOfFilters[w] = 0;
             }
         }
 
@@ -1012,8 +1003,8 @@ INT FDKaacEnc_TnsEncode(
 {
     INT i, startLine, stopLine;
 
-    if ( ( (blockType == SHORT_WINDOW) && (!tnsData->dataRaw.Short.subBlockInfo[subBlockNumber].tnsActive) )
-      || ( (blockType != SHORT_WINDOW) && (!tnsData->dataRaw.Long.subBlockInfo.tnsActive) ) )
+    if ( ( (blockType == SHORT_WINDOW) && (!tnsData->dataRaw.Short.subBlockInfo[subBlockNumber].tnsActive[HIFILT]) )
+      || ( (blockType != SHORT_WINDOW) && (!tnsData->dataRaw.Long.subBlockInfo.tnsActive[HIFILT]) ) )
     {
       return 1;
     }
@@ -1129,8 +1120,9 @@ static INT FDKaacEnc_AutoToParcor(
   FIXP_DBL *RESTRICT workBuffer = parcorWorkBuffer;
   const FIXP_DBL  autoCorr_0 = input[0];
 
+  FDKmemclear(reflCoeff,numOfCoeff*sizeof(FIXP_DBL));
+
   if((FIXP_DBL)input[0] == FL2FXCONST_DBL(0.0)) {
-    FDKmemclear(reflCoeff,numOfCoeff*sizeof(FIXP_DBL));
     return(predictionGain);
   }
 
diff --git a/libAACenc/src/aacenc_tns.h b/libAACenc/src/aacenc_tns.h
index f2b731f..2824cbc 100644
--- a/libAACenc/src/aacenc_tns.h
+++ b/libAACenc/src/aacenc_tns.h
@@ -2,7 +2,7 @@
 /* -----------------------------------------------------------------------------------------------------------
 Software License for The Fraunhofer FDK AAC Codec Library for Android
 
-© Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+© Copyright  1995 - 2015 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
   All rights reserved.
 
  1.    INTRODUCTION
@@ -117,21 +117,25 @@ amm-info@iis.fraunhofer.de
 
 #define MAX_NUM_OF_FILTERS 2
 
+#define HIFILT 0           /* index of higher filter   */
+#define LOFILT 1           /* index of lower filter    */
 
-typedef struct{ /*stuff that is tabulated dependent on bitrate etc. */
-  INT     filterEnabled[MAX_NUM_OF_FILTERS];
-  INT     threshOn[MAX_NUM_OF_FILTERS];                /* min. prediction gain for using tns TABUL*/
-  INT     tnsLimitOrder[MAX_NUM_OF_FILTERS];           /* Limit for TNS order TABUL*/
-  INT     tnsFilterDirection[MAX_NUM_OF_FILTERS];      /* Filtering direction, 0=up, 1=down TABUL */
-  INT     acfSplit[MAX_NUM_OF_FILTERS];
-  INT     seperateFiltersAllowed;
-
-}TNS_CONFIG_TABULATED;
 
+typedef struct{ /* stuff that is tabulated dependent on bitrate etc. */
+  INT      filterEnabled[MAX_NUM_OF_FILTERS];
+  INT      threshOn[MAX_NUM_OF_FILTERS];                /* min. prediction gain for using tns TABUL*/
+  INT      filterStartFreq[MAX_NUM_OF_FILTERS];         /* lowest freq for lpc TABUL*/
+  INT      tnsLimitOrder[MAX_NUM_OF_FILTERS];           /* Limit for TNS order TABUL*/
+  INT      tnsFilterDirection[MAX_NUM_OF_FILTERS];      /* Filtering direction, 0=up, 1=down TABUL */
+  INT      acfSplit[MAX_NUM_OF_FILTERS];
+  FIXP_DBL tnsTimeResolution[MAX_NUM_OF_FILTERS];       /* TNS max. time resolution TABUL. Should be fract but MSVC won't compile then */
+  INT      seperateFiltersAllowed;
+} TNS_PARAMETER_TABULATED;
 
 
 typedef struct {   /*assigned at InitTime*/
-  TNS_CONFIG_TABULATED confTab;
+  TNS_PARAMETER_TABULATED confTab;
+  INT isLowDelay;
   INT tnsActive;
   INT maxOrder;                /* max. order of tns filter */
   INT coefRes;
@@ -148,8 +152,8 @@ typedef struct {   /*assigned at InitTime*/
 
 
 typedef struct {
-  INT   tnsActive;
-  INT   predictionGain;
+  INT   tnsActive[MAX_NUM_OF_FILTERS];
+  INT   predictionGain[MAX_NUM_OF_FILTERS];
 } TNS_SUBBLOCK_INFO;
 
 typedef struct{   /*changed at runTime*/
diff --git a/libAACenc/src/adj_thr.cpp b/libAACenc/src/adj_thr.cpp
index c318843..a79a9ae 100644
--- a/libAACenc/src/adj_thr.cpp
+++ b/libAACenc/src/adj_thr.cpp
@@ -153,10 +153,10 @@ static const BIT_PE_SFAC S_Bits2PeTab16000[] = {
   { 24000, 0x23D70A3D, 0x029F16B1, 0x2199999A, 0x07DD4413, 0x23D70A3D, 0x029F16B1, 0x2199999A, 0x07DD4413},
   { 32000, 0x247AE148, 0x11B1D92B, 0x23851EB8, 0x01F75105, 0x247AE148, 0x110A137F, 0x23851EB8, 0x01F75105},
   { 48000, 0x2D1EB852, 0x6833C600, 0x247AE148, 0x014F8B59, 0x2CCCCCCD, 0x68DB8BAC, 0x247AE148, 0x01F75105},
-  { 64000, 0x60000000, 0x00000000, 0x251EB852, 0x154C985F, 0x60000000, 0x00000000, 0x2570A3D7, 0x154C985F},
-  { 96000, 0x60000000, 0x00000000, 0x39EB851F, 0x088509C0, 0x60000000, 0x00000000, 0x3A3D70A4, 0x088509C0},
-  {128000, 0x60000000, 0x00000000, 0x423D70A4, 0x18A43BB4, 0x60000000, 0x00000000, 0x428F5C29, 0x181E03F7},
-  {148000, 0x60000000, 0x00000000, 0x5147AE14, 0x00000000, 0x60000000, 0x00000000, 0x5147AE14, 0x00000000}
+  { 64000, 0x25c28f40, 0x00000000, 0x251EB852, 0x01480000, 0x25c28f40, 0x00000000, 0x2570A3D7, 0x01480000},
+  { 96000, 0x25c28f40, 0x00000000, 0x26000000, 0x01000000, 0x25c28f40, 0x00000000, 0x26000000, 0x01000000},
+  {128000, 0x25c28f40, 0x00000000, 0x270a3d80, 0x01000000, 0x25c28f40, 0x00000000, 0x270a3d80, 0x01000000},
+  {148000, 0x25c28f40, 0x00000000, 0x28000000, 0x00000000, 0x25c28f40, 0x00000000, 0x28000000, 0x00000000}
 };
 
 static const BIT_PE_SFAC S_Bits2PeTab22050[] = {
@@ -166,8 +166,8 @@ static const BIT_PE_SFAC S_Bits2PeTab22050[] = {
   { 48000, 0x23d70a3d, 0x014f8b59, 0x2199999a, 0x03eea20a, 0x23d70a3d, 0x14f8b59,  0x2199999a, 0x03eea20a},
   { 64000, 0x247ae148, 0x08d8ec96, 0x23851eb8, 0x00fba882, 0x247ae148, 0x88509c0,  0x23851eb8, 0x00fba882},
   { 96000, 0x2d1eb852, 0x3419e300, 0x247ae148, 0x00a7c5ac, 0x2ccccccd, 0x346dc5d6, 0x247ae148, 0x00fba882},
-  {128000, 0x60000000, 0x00000000, 0x251eb852, 0x029f16b1, 0x60000000, 0x00000000, 0x2570a3d7, 0x009f16b1},
-  {148000, 0x60000000, 0x00000000, 0x26b851ec, 0x00000000, 0x60000000, 0x00000000, 0x270a3d71, 0x00000000}
+  {128000, 0x25c28f40, 0x00000000, 0x251eb852, 0x029f16b1, 0x60000000, 0x25c28f40, 0x2570a3d7, 0x009f16b1},
+  {148000, 0x25c28f40, 0x00000000, 0x26b851ec, 0x00000000, 0x60000000, 0x25c28f40, 0x270a3d71, 0x00000000}
 };
 
 static const BIT_PE_SFAC S_Bits2PeTab24000[] = {
@@ -178,21 +178,21 @@ static const BIT_PE_SFAC S_Bits2PeTab24000[] = {
   { 64000, 0x24cccccd, 0x05e5f30e, 0x22e147ae, 0x01a36e2f, 0x24cccccd, 0x05e5f30e, 0x23333333, 0x014f8b59},
   { 96000, 0x2a8f5c29, 0x24b33db0, 0x247ae148, 0x00fba882, 0x2a8f5c29, 0x26fe718b, 0x247ae148, 0x00fba882},
   {128000, 0x4e666666, 0x1cd5f99c, 0x2570a3d7, 0x010c6f7a, 0x50a3d70a, 0x192a7371, 0x2570a3d7, 0x010c6f7a},
-  {148000, 0x60000000, 0x00000000, 0x26147ae1, 0x00000000, 0x60000000, 0x00000000, 0x26147ae1, 0x00000000}
+  {148000, 0x25c28f40, 0x00000000, 0x26147ae1, 0x00000000, 0x25c28f40, 0x00000000, 0x26147ae1, 0x00000000}
 };
 
 static const BIT_PE_SFAC S_Bits2PeTab32000[] = {
-  { 16000, 0x1199999a, 0x20c49ba6, 0x00000000, 0x4577d955, 0x00000000, 0x60fe4799, 0x00000000, 0x00000000},
-  { 24000, 0x1999999a, 0x0fba8827, 0x10f5c28f, 0x1b866e44, 0x17ae147b, 0x0fba8827, 0x00000000, 0x4d551d69},
+  { 16000, 0x247ae140, 0xFFFFAC1E, 0x270a3d80, 0xFFFE9B7C, 0x14ccccc0, 0x000110A1, 0x15c28f60, 0xFFFEEF5F},
+  { 24000, 0x23333340, 0x0fba8827, 0x21999980, 0x1b866e44, 0x18f5c280, 0x0fba8827, 0x119999a0, 0x4d551d69},
   { 32000, 0x1d70a3d7, 0x07357e67, 0x17ae147b, 0x09d49518, 0x1b851eb8, 0x0a7c5ac4, 0x12e147ae, 0x110a137f},
   { 48000, 0x20f5c28f, 0x049667b6, 0x1c7ae148, 0x053e2d62, 0x20a3d70a, 0x053e2d62, 0x1b333333, 0x05e5f30e},
   { 64000, 0x23333333, 0x029f16b1, 0x1f0a3d71, 0x02f2f987, 0x23333333, 0x029f16b1, 0x1e147ae1, 0x03eea20a},
   { 96000, 0x25c28f5c, 0x2c3c9eed, 0x21eb851f, 0x01f75105, 0x25c28f5c, 0x0a7c5ac4, 0x21eb851f, 0x01a36e2f},
   {128000, 0x50f5c28f, 0x18a43bb4, 0x23d70a3d, 0x010c6f7a, 0x30000000, 0x168b5cc0, 0x23851eb8, 0x0192a737},
-  {148000, 0x60000000, 0x00000000, 0x247ae148, 0x00dfb23b, 0x3dc28f5c, 0x300f4aaf, 0x247ae148, 0x01bf6476},
-  {160000, 0x60000000, 0xb15b5740, 0x24cccccd, 0x053e2d62, 0x4f5c28f6, 0xbefd0072, 0x251eb852, 0x04fb1184},
-  {200000, 0x00000000, 0x00000000, 0x2b333333, 0x0836be91, 0x00000000, 0x00000000, 0x2b333333, 0x0890390f},
-  {320000, 0x00000000, 0x00000000, 0x4947ae14, 0x00000000, 0x00000000, 0x00000000, 0x4a8f5c29, 0x00000000}
+  {148000, 0x25c28f40, 0x00000000, 0x247ae148, 0x00dfb23b, 0x3dc28f5c, 0x300f4aaf, 0x247ae148, 0x01bf6476},
+  {160000, 0x25c28f40, 0xb15b5740, 0x24cccccd, 0x053e2d62, 0x4f5c28f6, 0xbefd0072, 0x251eb852, 0x04fb1184},
+  {200000, 0x25c28f40, 0x00000000, 0x2b333333, 0x0836be91, 0x25c28f40, 0x00000000, 0x2b333333, 0x0890390f},
+  {320000, 0x25c28f40, 0x00000000, 0x4947ae14, 0x00000000, 0x25c28f40, 0x00000000, 0x4a8f5c29, 0x00000000}
 };
 
 static const BIT_PE_SFAC S_Bits2PeTab44100[] = {
@@ -205,8 +205,8 @@ static const BIT_PE_SFAC S_Bits2PeTab44100[] = {
   {128000, 0x2ae147ae, 0x1b435265, 0x223d70a4, 0x0192a737, 0x2a3d70a4, 0x1040bfe4, 0x21eb851f, 0x0192a737},
   {148000, 0x3b851eb8, 0x2832069c, 0x23333333, 0x00dfb23b, 0x3428f5c3, 0x2054c288, 0x22e147ae, 0x00dfb23b},
   {160000, 0x4a3d70a4, 0xc32ebe5a, 0x23851eb8, 0x01d5c316, 0x40000000, 0xcb923a2b, 0x23333333, 0x01d5c316},
-  {200000, 0x00000000, 0x00000000, 0x25c28f5c, 0x0713f078, 0x00000000, 0x00000000, 0x2570a3d7, 0x072a4f17},
-  {320000, 0x00000000, 0x00000000, 0x3fae147b, 0x00000000, 0x00000000, 0x00000000, 0x3fae147b, 0x00000000}
+  {200000, 0x25c28f40, 0x00000000, 0x25c28f5c, 0x0713f078, 0x25c28f40, 0x00000000, 0x2570a3d7, 0x072a4f17},
+  {320000, 0x25c28f40, 0x00000000, 0x3fae147b, 0x00000000, 0x25c28f40, 0x00000000, 0x3fae147b, 0x00000000}
 };
 
 static const BIT_PE_SFAC S_Bits2PeTab48000[] = {
@@ -219,8 +219,8 @@ static const BIT_PE_SFAC S_Bits2PeTab48000[] = {
   {128000, 0x28f5c28f, 0x14727dcc, 0x2147ae14, 0x0218def4, 0x2851eb85, 0x0e27e0f0, 0x20f5c28f, 0x0218def4},
   {148000, 0x3570a3d7, 0x1cd5f99c, 0x228f5c29, 0x01bf6476, 0x30f5c28f, 0x18777e75, 0x223d70a4, 0x01bf6476},
   {160000, 0x40000000, 0xcb923a2b, 0x23333333, 0x0192a737, 0x39eb851f, 0xd08d4bae, 0x22e147ae, 0x0192a737},
-  {200000, 0x00000000, 0x00000000, 0x251eb852, 0x06775a1b, 0x00000000, 0x00000000, 0x24cccccd, 0x06a4175a},
-  {320000, 0x00000000, 0x00000000, 0x3ccccccd, 0x00000000, 0x00000000, 0x00000000, 0x3d1eb852, 0x00000000}
+  {200000, 0x25c28f40, 0x00000000, 0x251eb852, 0x06775a1b, 0x25c28f40, 0x00000000, 0x24cccccd, 0x06a4175a},
+  {320000, 0x25c28f40, 0x00000000, 0x3ccccccd, 0x00000000, 0x25c28f40, 0x00000000, 0x3d1eb852, 0x00000000}
 };
 
 static const BITS2PE_CFG_TAB bits2PeConfigTab[] = {
@@ -258,6 +258,7 @@ static void FDKaacEnc_InitBits2PeFactor(
         const INT nChannels,
         const INT sampleRate,
         const INT advancedBitsToPe,
+        const INT dZoneQuantEnable,
         const INT invQuant
         )
 {
@@ -329,7 +330,32 @@ static void FDKaacEnc_InitBits2PeFactor(
   } /* advancedBitsToPe */
 
 
-  /* return bits2pe factor */
+  if (dZoneQuantEnable)
+  {
+    if(bit2PE_m >= (FL2FXCONST_DBL(0.6f))>>bit2PE_e)
+    {
+      /* Additional headroom for addition */
+      bit2PE_m >>= 1;
+      bit2PE_e  += 1;
+    }
+
+    /* the quantTendencyCompensator compensates a lower bit consumption due to increasing the tendency to quantize low spectral values to the lower quantizer border for bitrates below a certain bitrate threshold --> see also function calcSfbDistLD in quantize.c */
+    if ((bitRate/nChannels > 32000) && (bitRate/nChannels <= 40000)) {
+      bit2PE_m += (FL2FXCONST_DBL(0.4f))>>bit2PE_e;
+    }
+    else if (bitRate/nChannels > 20000) {
+      bit2PE_m += (FL2FXCONST_DBL(0.3f))>>bit2PE_e;
+    }
+    else if (bitRate/nChannels >= 16000) {
+      bit2PE_m += (FL2FXCONST_DBL(0.3f))>>bit2PE_e;
+    }
+    else {
+      bit2PE_m += (FL2FXCONST_DBL(0.0f))>>bit2PE_e;
+    }
+  }
+
+
+  /***** 3.) Return bits2pe factor *****/
   *bits2PeFactor_m = bit2PE_m;
   *bits2PeFactor_e = bit2PE_e;
 }
@@ -1649,6 +1675,7 @@ static void FDKaacEnc_adaptThresholdsToPe(CHANNEL_MAPPING*  cm,
                                 QC_OUT_ELEMENT*   qcElement[(8)],
                                 PSY_OUT_ELEMENT*  psyOutElement[(8)],
                                 const INT         desiredPe,
+                                const INT         maxIter2ndGuess,
                                 const INT         processElements,
                                 const INT         elementOffset)
 {
@@ -1733,7 +1760,7 @@ static void FDKaacEnc_adaptThresholdsToPe(CHANNEL_MAPPING*  cm,
    /* Part III: Iterate until bit constraints are met */
    /* -------------------------------------------------- */
    iter = 0;
-   while ((fixp_abs(redPeGlobal - desiredPe) > fMultI(FL2FXCONST_DBL(0.05f),desiredPe)) && (iter < 1)) {
+   while ((fixp_abs(redPeGlobal - desiredPe) > fMultI(FL2FXCONST_DBL(0.05f),desiredPe)) && (iter < maxIter2ndGuess)) {
 
      INT desiredPeNoAHGlobal;
      INT redPeNoAHGlobal = 0;
@@ -2225,7 +2252,8 @@ void FDKaacEnc_AdjThrInit(
         INT             nChannelsEff,
         INT             sampleRate,
         INT             advancedBitsToPe,
-        FIXP_DBL        vbrQualFactor
+        FIXP_DBL        vbrQualFactor,
+        const INT       dZoneQuantEnable
         )
 {
   INT i;
@@ -2233,6 +2261,10 @@ void FDKaacEnc_AdjThrInit(
   FIXP_DBL POINT8 = FL2FXCONST_DBL(0.8f);
   FIXP_DBL POINT6 = FL2FXCONST_DBL(0.6f);
 
+  /* Max number of iterations in second guess is 3 for lowdelay aot and for configurations with
+     multiple audio elements in general, otherwise iteration value is always 1. */
+  hAdjThr->maxIter2ndGuess = (advancedBitsToPe!=0 || nElements>1) ? 3 : 1;
+
   /* common for all elements: */
   /* parameters for bitres control */
   hAdjThr->bresParamLong.clipSaveLow   = (FIXP_DBL)0x1999999a; /* FL2FXCONST_DBL(0.2f); */
@@ -2313,10 +2345,11 @@ void FDKaacEnc_AdjThrInit(
     FDKaacEnc_InitBits2PeFactor(
               &atsElem->bits2PeFactor_m,
               &atsElem->bits2PeFactor_e,
-              chBitrate,       /* bitrate/channel*/
+              chBitrate*nChannelsEff, /* overall bitrate */
               nChannelsEff,    /* number of channels */
               sampleRate,
               advancedBitsToPe,
+              dZoneQuantEnable,
               invQuant
               );
 
@@ -2545,6 +2578,7 @@ void FDKaacEnc_AdjustThresholds(ATS_ELEMENT*        AdjThrStateElement[(8)],
                                 QC_OUT*             qcOut,
                                 PSY_OUT_ELEMENT*    psyOutElement[(8)],
                                 INT                 CBRbitrateMode,
+                                INT                 maxIter2ndGuess,
                                 CHANNEL_MAPPING*    cm)
 {
     int i;
@@ -2570,6 +2604,7 @@ void FDKaacEnc_AdjustThresholds(ATS_ELEMENT*        AdjThrStateElement[(8)],
                                             qcElement,
                                             psyOutElement,
                                             qcElement[i]->grantedPeCorr,
+                                            maxIter2ndGuess,
                                             1,         /* Process only 1 element */
                                             i);        /* Process exactly THIS element */
 
diff --git a/libAACenc/src/adj_thr.h b/libAACenc/src/adj_thr.h
index 69b1dcc..be68c6e 100644
--- a/libAACenc/src/adj_thr.h
+++ b/libAACenc/src/adj_thr.h
@@ -2,7 +2,7 @@
 /* -----------------------------------------------------------------------------------------------------------
 Software License for The Fraunhofer FDK AAC Codec Library for Android
 
-© Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+© Copyright  1995 - 2015 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
   All rights reserved.
 
  1.    INTRODUCTION
@@ -118,7 +118,8 @@ void FDKaacEnc_AdjThrInit(ADJ_THR_STATE *hAdjThr,
                 INT nChannelsEff,
                 INT sampleRate,
                 INT advancedBitsToPe,
-                FIXP_DBL vbrQualFactor);
+                FIXP_DBL vbrQualFactor,
+                const INT dZoneQuantEnable);
  
 
 void FDKaacEnc_DistributeBits(ADJ_THR_STATE *adjThrState,
@@ -140,6 +141,7 @@ void FDKaacEnc_AdjustThresholds(ATS_ELEMENT* AdjThrStateElement[(8)],
     QC_OUT*           qcOut,
     PSY_OUT_ELEMENT*  psyOutElement[(8)],
     INT               CBRbitrateMode,
+    INT               maxIter2ndGuess,
     CHANNEL_MAPPING*  cm);
 
 void FDKaacEnc_AdjThrClose(ADJ_THR_STATE** hAdjThr);
diff --git a/libAACenc/src/adj_thr_data.h b/libAACenc/src/adj_thr_data.h
index 3eb7678..7c3a191 100644
--- a/libAACenc/src/adj_thr_data.h
+++ b/libAACenc/src/adj_thr_data.h
@@ -2,7 +2,7 @@
 /* -----------------------------------------------------------------------------------------------------------
 Software License for The Fraunhofer FDK AAC Codec Library for Android
 
-© Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+© Copyright  1995 - 2015 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
   All rights reserved.
 
  1.    INTRODUCTION
@@ -145,6 +145,7 @@ typedef struct {
 typedef struct {
   BRES_PARAM bresParamLong, bresParamShort;
   ATS_ELEMENT* adjThrStateElem[(8)];
+  INT maxIter2ndGuess;
 } ADJ_THR_STATE;
 
 #endif
diff --git a/libAACenc/src/bandwidth.cpp b/libAACenc/src/bandwidth.cpp
index 6fc7d87..6937362 100644
--- a/libAACenc/src/bandwidth.cpp
+++ b/libAACenc/src/bandwidth.cpp
@@ -2,7 +2,7 @@
 /* -----------------------------------------------------------------------------------------------------------
 Software License for The Fraunhofer FDK AAC Codec Library for Android
 
-© Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+© Copyright  1995 - 2015 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
   All rights reserved.
 
  1.    INTRODUCTION
@@ -127,7 +127,7 @@ static const BANDWIDTH_TAB bandWidthTable_LD_24000[] = {
   { 8000,  2000,  2000},
   {12000,  2000,  2300},
   {16000,  2200,  2500},
-  {24000,  5650,  6400},
+  {24000,  5650,  7200},
   {32000,  11600, 12000},
   {40000,  12000, 16000},
   {48000,  16000, 16000},
@@ -138,10 +138,10 @@ static const BANDWIDTH_TAB bandWidthTable_LD_24000[] = {
 static const BANDWIDTH_TAB bandWidthTable_LD_32000[] = {
   { 8000,  2000,  2000},
   {12000,  2000,  2000},
-  {24000,  4250,  5200},
+  {24000,  4250,  7200},
   {32000,  8400,  9000},
   {40000,  9400,  11300},
-  {48000,  11900, 13700},
+  {48000,  11900, 14700},
   {64000,  14800, 16000},
   {76000,  16000, 16000},
   {360001, 16000, 16000}
diff --git a/libAACenc/src/pnsparam.cpp b/libAACenc/src/pnsparam.cpp
index afc5bdd..9d59ddc 100644
--- a/libAACenc/src/pnsparam.cpp
+++ b/libAACenc/src/pnsparam.cpp
@@ -2,7 +2,7 @@
 /* -----------------------------------------------------------------------------------------------------------
 Software License for The Fraunhofer FDK AAC Codec Library for Android
 
-© Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+© Copyright  1995 - 2015 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
   All rights reserved.
 
  1.    INTRODUCTION
@@ -107,6 +107,7 @@ typedef struct {
 typedef struct {
   ULONG brFrom;
   ULONG brTo;
+  UCHAR S16000;
   UCHAR S22050;
   UCHAR S24000;
   UCHAR S32000;
@@ -115,25 +116,26 @@ typedef struct {
 } AUTO_PNS_TAB;
 
 static const AUTO_PNS_TAB levelTable_mono[]= {
-  {0,      11999, 1, 1, 1, 1, 1,},
-  {12000,  19999, 1, 1, 1, 1, 1,},
-  {20000,  28999, 2, 1, 1, 1, 1,},
-  {29000,  40999, 4, 4, 4, 2, 2,},
-  {41000,  55999, 9, 9, 7, 7, 7,},
-  {56000,  79999, 0, 0, 0, 9, 9,},
-  {80000,  99999, 0, 0, 0, 0, 0,},
-  {100000,999999, 0, 0, 0, 0, 0,},
+  {0,      11999, 0, 1, 1, 1, 1, 1,},
+  {12000,  19999, 0, 1, 1, 1, 1, 1,},
+  {20000,  28999, 0, 2, 1, 1, 1, 1,},
+  {29000,  40999, 0, 4, 4, 4, 2, 2,},
+  {41000,  55999, 0, 9, 9, 7, 7, 7,},
+  {56000,  61999, 0, 0, 0, 0, 9, 9,},
+  {62000,  75999, 0, 0, 0, 0, 0, 0,},
+  {76000,  92999, 0, 0, 0, 0, 0, 0,},
+  {93000, 999999, 0, 0, 0, 0, 0, 0,},
 };
 
 static const AUTO_PNS_TAB levelTable_stereo[]= {
-  {0,      11999, 1, 1, 1, 1, 1,},
-  {12000,  19999, 3, 1, 1, 1, 1,},
-  {20000,  28999, 3, 3, 3, 2, 2,},
-  {29000,  40999, 7, 6, 6, 5, 5,},
-  {41000,  55999, 9, 9, 7, 7, 7,},
-  {56000,  79999, 0, 0, 0, 0, 0,},
-  {80000,  99999, 0, 0, 0, 0, 0,},
-  {100000,999999, 0, 0, 0, 0, 0,},
+  {0,      11999, 0, 1, 1, 1, 1, 1,},
+  {12000,  19999, 0, 3, 1, 1, 1, 1,},
+  {20000,  28999, 0, 3, 3, 3, 2, 2,},
+  {29000,  40999, 0, 7, 6, 6, 5, 5,},
+  {41000,  55999, 0, 9, 9, 7, 7, 7,},
+  {56000,  79999, 0, 0, 0, 0, 0, 0,},
+  {80000,  99999, 0, 0, 0, 0, 0, 0,},
+  {100000,999999, 0, 0, 0, 0, 0, 0,},
 };
 
 
@@ -160,11 +162,11 @@ static const PNS_INFO_TAB pnsInfoTab[] = {
 };
 
 static const AUTO_PNS_TAB levelTable_lowComplexity[]= {
-  {0,      27999, 0, 0, 0, 0, 0,},
-  {28000,  31999, 2, 2, 2, 2, 2,},
-  {32000,  47999, 3, 3, 3, 3, 3,},
-  {48000,  48000, 4, 4, 4, 4, 4,},
-  {48001, 999999, 0, 0, 0, 0, 0,},
+  {0,      27999, 0, 0, 0, 0, 0, 0,},
+  {28000,  31999, 0, 2, 2, 2, 2, 2,},
+  {32000,  47999, 0, 3, 3, 3, 3, 3,},
+  {48000,  48000, 0, 4, 4, 4, 4, 4,},
+  {48001, 999999, 0, 0, 0, 0, 0, 0,},
 };
 
 /* conversion of old LC tuning tables to new (LD enc) structure (only entries which are actually used were converted) */
@@ -211,6 +213,7 @@ int FDKaacEnc_lookUpPnsUse (int bitRate, int sampleRate, int numChan, const int
   }
 
   switch (sampleRate) {
+  case 16000: hUsePns = levelTable[i].S16000; break;
   case 22050: hUsePns = levelTable[i].S22050; break;
   case 24000: hUsePns = levelTable[i].S24000; break;
   case 32000: hUsePns = levelTable[i].S32000; break;
diff --git a/libAACenc/src/psy_main.cpp b/libAACenc/src/psy_main.cpp
index 3cc9438..446c894 100644
--- a/libAACenc/src/psy_main.cpp
+++ b/libAACenc/src/psy_main.cpp
@@ -342,6 +342,7 @@ AAC_ENCODER_ERROR FDKaacEnc_psyMainInit(PSY_INTERNAL *hPsy,
         tnsChannels,
         LONG_WINDOW,
         hPsy->granuleLength,
+        isLowDelay(audioObjectType),
         (syntaxFlags&AC_SBR_PRESENT)?1:0,
        &(hPsy->psyConf[0].tnsConf),
        &hPsy->psyConf[0],
@@ -362,6 +363,7 @@ AAC_ENCODER_ERROR FDKaacEnc_psyMainInit(PSY_INTERNAL *hPsy,
             tnsChannels,
             SHORT_WINDOW,
             hPsy->granuleLength,
+            isLowDelay(audioObjectType),
             (syntaxFlags&AC_SBR_PRESENT)?1:0,
            &hPsy->psyConf[1].tnsConf,
            &hPsy->psyConf[1],
@@ -763,7 +765,8 @@ AAC_ENCODER_ERROR FDKaacEnc_psyMain(INT                 channels,
 
     /* Advance psychoacoustics: Tonality and TNS */
     if (psyStatic[0]->isLFE) {
-        tnsData[0]->dataRaw.Long.subBlockInfo.tnsActive = 0;
+        tnsData[0]->dataRaw.Long.subBlockInfo.tnsActive[HIFILT] = 0;
+        tnsData[0]->dataRaw.Long.subBlockInfo.tnsActive[LOFILT] = 0;
     }
     else
     {
@@ -819,11 +822,15 @@ AAC_ENCODER_ERROR FDKaacEnc_psyMain(INT                 channels,
             for(w = 0; w < nWindows[0]; w++)
             {
                 if (isShortWindow[0])
-                    tnsActive[w] = tnsData[0]->dataRaw.Short.subBlockInfo[w].tnsActive ||
-                    ((channels == 2) ? tnsData[1]->dataRaw.Short.subBlockInfo[w].tnsActive : 0);
+                    tnsActive[w] = tnsData[0]->dataRaw.Short.subBlockInfo[w].tnsActive[HIFILT] ||
+                    tnsData[0]->dataRaw.Short.subBlockInfo[w].tnsActive[LOFILT] ||
+                    tnsData[channels-1]->dataRaw.Short.subBlockInfo[w].tnsActive[HIFILT] ||
+                    tnsData[channels-1]->dataRaw.Short.subBlockInfo[w].tnsActive[LOFILT];
                 else
-                    tnsActive[w] = tnsData[0]->dataRaw.Long.subBlockInfo.tnsActive ||
-                    ((channels == 2) ? tnsData[1]->dataRaw.Long.subBlockInfo.tnsActive : 0);
+                    tnsActive[w] = tnsData[0]->dataRaw.Long.subBlockInfo.tnsActive[HIFILT] ||
+                    tnsData[0]->dataRaw.Long.subBlockInfo.tnsActive[LOFILT] ||
+                    tnsData[channels-1]->dataRaw.Long.subBlockInfo.tnsActive[HIFILT] ||
+                    tnsData[channels-1]->dataRaw.Long.subBlockInfo.tnsActive[LOFILT];
             }
 
             for(ch = 0; ch < channels; ch++) {
@@ -1150,8 +1157,8 @@ AAC_ENCODER_ERROR FDKaacEnc_psyMain(INT                 channels,
                        psyData[ch]->sfbMaxScaleSpec.Long,
                        sfbTonality[ch],
                        psyOutChannel[ch]->tnsInfo.order[0][0],
-                       tnsData[ch]->dataRaw.Long.subBlockInfo.predictionGain,
-                       tnsData[ch]->dataRaw.Long.subBlockInfo.tnsActive,
+                       tnsData[ch]->dataRaw.Long.subBlockInfo.predictionGain[HIFILT],
+                       tnsData[ch]->dataRaw.Long.subBlockInfo.tnsActive[HIFILT],
                        psyOutChannel[ch]->sfbEnergyLdData,
                        psyOutChannel[ch]->noiseNrg );
         } /* !isLFE */
diff --git a/libAACenc/src/qc_data.h b/libAACenc/src/qc_data.h
index a9309c8..00d6090 100644
--- a/libAACenc/src/qc_data.h
+++ b/libAACenc/src/qc_data.h
@@ -2,7 +2,7 @@
 /* -----------------------------------------------------------------------------------------------------------
 Software License for The Fraunhofer FDK AAC Codec Library for Android
 
-© Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+© Copyright  1995 - 2015 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
   All rights reserved.
 
  1.    INTRODUCTION
@@ -269,6 +269,8 @@ typedef struct
   BITCNTR_STATE *hBitCounter;
   ADJ_THR_STATE *hAdjThr;
 
+  INT dZoneQuantEnable;   /* enable dead zone quantizer */
+
 } QC_STATE;
 
 #endif /* _QC_DATA_H */
diff --git a/libAACenc/src/qc_main.cpp b/libAACenc/src/qc_main.cpp
index 7503309..9cd73f6 100644
--- a/libAACenc/src/qc_main.cpp
+++ b/libAACenc/src/qc_main.cpp
@@ -380,7 +380,7 @@ AAC_ENCODER_ERROR FDKaacEnc_QCInit(QC_STATE *hQC,
   if ( isConstantBitrateMode(hQC->bitrateMode) ) {
     INT bitresPerChannel = (hQC->bitResTotMax / init->channelMapping->nChannelsEff);
     /* 0: full bitreservoir, 1: reduced bitreservoir, 2: disabled bitreservoir */
-    hQC->bitDistributionMode = (bitresPerChannel>100) ? 0 : (bitresPerChannel>0) ? 1 : 2;
+    hQC->bitDistributionMode = (bitresPerChannel>BITRES_MIN_LD) ? 0 : (bitresPerChannel>0) ? 1 : 2;
   }
   else {
     hQC->bitDistributionMode = 0; /* full bitreservoir */
@@ -405,6 +405,16 @@ AAC_ENCODER_ERROR FDKaacEnc_QCInit(QC_STATE *hQC,
     }
   }
 
+  if (init->channelMapping->nChannelsEff == 1 &&
+     (init->bitrate / init->channelMapping->nChannelsEff) < 32000 &&
+     init->advancedBitsToPe != 0
+     )
+  {
+    hQC->dZoneQuantEnable = 1;
+  } else {
+    hQC->dZoneQuantEnable = 0;
+  }
+
   FDKaacEnc_AdjThrInit(
         hQC->hAdjThr,
         init->meanPe,
@@ -414,7 +424,8 @@ AAC_ENCODER_ERROR FDKaacEnc_QCInit(QC_STATE *hQC,
         init->channelMapping->nChannelsEff,
         init->sampleRate,                 /* output sample rate */
         init->advancedBitsToPe,           /* if set, calc bits2PE factor depending on samplerate */
-        hQC->vbrQualFactor
+        hQC->vbrQualFactor,
+        hQC->dZoneQuantEnable
         );
 
   return AAC_ENC_OK;
@@ -877,6 +888,7 @@ AAC_ENCODER_ERROR FDKaacEnc_QCMain(QC_STATE* RESTRICT         hQC,
                                      qcOut[c],
                                      psyOut[c]->psyOutElement,
                                      isConstantBitrateMode(hQC->bitrateMode),
+                                     hQC->hAdjThr->maxIter2ndGuess,
                                      cm);
 
       } /* -end- sub frame counter */
@@ -904,6 +916,7 @@ AAC_ENCODER_ERROR FDKaacEnc_QCMain(QC_STATE* RESTRICT         hQC,
                       FDKaacEnc_EstimateScaleFactors(psyOut[c]->psyOutElement[i]->psyOutChannel,
                                             qcElement[c][i]->qcOutChannel,
                                             hQC->invQuant,
+                                            hQC->dZoneQuantEnable,
                                             cm->elInfo[i].nChannelsInEl);
 
 
@@ -998,7 +1011,8 @@ AAC_ENCODER_ERROR FDKaacEnc_QCMain(QC_STATE* RESTRICT         hQC,
                                                              qcOutCh->mdctSpectrum,
                                                              qcOutCh->globalGain,
                                                              qcOutCh->scf,
-                                                             qcOutCh->quantSpec) ;
+                                                             qcOutCh->quantSpec,
+                                                             hQC->dZoneQuantEnable);
 
                                   /*-------------------------------------------- */
                                   if (FDKaacEnc_calcMaxValueInSfb(psyOutCh->sfbCnt,
diff --git a/libAACenc/src/quantize.cpp b/libAACenc/src/quantize.cpp
index 5380e35..a74da0e 100644
--- a/libAACenc/src/quantize.cpp
+++ b/libAACenc/src/quantize.cpp
@@ -2,7 +2,7 @@
 /* -----------------------------------------------------------------------------------------------------------
 Software License for The Fraunhofer FDK AAC Codec Library for Android
 
-© Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+© Copyright  1995 - 2015 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
   All rights reserved.
 
  1.    INTRODUCTION
@@ -104,13 +104,19 @@ amm-info@iis.fraunhofer.de
 static void FDKaacEnc_quantizeLines(INT      gain,
                           INT      noOfLines,
                           FIXP_DBL *mdctSpectrum,
-                          SHORT      *quaSpectrum)
+                          SHORT    *quaSpectrum,
+                          INT      dZoneQuantEnable)
 {
   int   line;
-  FIXP_DBL k = FL2FXCONST_DBL(-0.0946f + 0.5f)>>16;
+  FIXP_DBL k = FL2FXCONST_DBL(0.0f);
   FIXP_QTD quantizer = FDKaacEnc_quantTableQ[(-gain)&3];
   INT      quantizershift = ((-gain)>>2)+1;
+  const INT kShift=16;
 
+  if (dZoneQuantEnable)
+    k = FL2FXCONST_DBL(0.23f)>>kShift;
+  else
+    k = FL2FXCONST_DBL(-0.0946f + 0.5f)>>kShift;
 
   for (line = 0; line < noOfLines; line++)
   {
@@ -263,7 +269,8 @@ void FDKaacEnc_QuantizeSpectrum(INT sfbCnt,
                       FIXP_DBL *mdctSpectrum,
                       INT globalGain,
                       INT *scalefactors,
-                      SHORT *quantizedSpectrum)
+                      SHORT *quantizedSpectrum,
+                      INT dZoneQuantEnable)
 {
   INT sfbOffs,sfb;
 
@@ -280,7 +287,8 @@ void FDKaacEnc_QuantizeSpectrum(INT sfbCnt,
     FDKaacEnc_quantizeLines(globalGain - scalefactor, /* QSS */
                   sfbOffset[sfbOffs+sfb+1] - sfbOffset[sfbOffs+sfb],
                   mdctSpectrum + sfbOffset[sfbOffs+sfb],
-                  quantizedSpectrum + sfbOffset[sfbOffs+sfb]);
+                  quantizedSpectrum + sfbOffset[sfbOffs+sfb],
+                  dZoneQuantEnable);
   }
 }
 
@@ -296,7 +304,8 @@ void FDKaacEnc_QuantizeSpectrum(INT sfbCnt,
 FIXP_DBL FDKaacEnc_calcSfbDist(FIXP_DBL *mdctSpectrum,
                      SHORT *quantSpectrum,
                      INT noOfLines,
-                     INT gain
+                     INT gain,
+                     INT dZoneQuantEnable
                      )
 {
   INT i,scale;
@@ -311,7 +320,8 @@ FIXP_DBL FDKaacEnc_calcSfbDist(FIXP_DBL *mdctSpectrum,
     FDKaacEnc_quantizeLines(gain,
                   1,
                  &mdctSpectrum[i],
-                 &quantSpectrum[i]);
+                 &quantSpectrum[i],
+                  dZoneQuantEnable);
 
     if (fAbs(quantSpectrum[i])>MAX_QUANT) {
       return FL2FXCONST_DBL(0.0f);
diff --git a/libAACenc/src/quantize.h b/libAACenc/src/quantize.h
index 975b98e..16d3d4e 100644
--- a/libAACenc/src/quantize.h
+++ b/libAACenc/src/quantize.h
@@ -2,7 +2,7 @@
 /* -----------------------------------------------------------------------------------------------------------
 Software License for The Fraunhofer FDK AAC Codec Library for Android
 
-© Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+© Copyright  1995 - 2015 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
   All rights reserved.
 
  1.    INTRODUCTION
@@ -102,12 +102,14 @@ void FDKaacEnc_QuantizeSpectrum(INT sfbCnt,
                       INT sfbPerGroup,
                       INT *sfbOffset, FIXP_DBL *mdctSpectrum,
                       INT globalGain, INT *scalefactors,
-                      SHORT *quantizedSpectrum);
+                      SHORT *quantizedSpectrum,
+                      INT dZoneQuantEnable);
 
 FIXP_DBL FDKaacEnc_calcSfbDist(FIXP_DBL *mdctSpectrum,
                      SHORT *quantSpectrum,
                      INT noOfLines,
-                     INT gain);
+                     INT gain,
+                     INT dZoneQuantEnable);
 
 void FDKaacEnc_calcSfbQuantEnergyAndDist(FIXP_DBL *mdctSpectrum,
                                SHORT   *quantSpectrum,
diff --git a/libAACenc/src/sf_estim.cpp b/libAACenc/src/sf_estim.cpp
index 72b75a6..1cb243b 100644
--- a/libAACenc/src/sf_estim.cpp
+++ b/libAACenc/src/sf_estim.cpp
@@ -2,7 +2,7 @@
 /* -----------------------------------------------------------------------------------------------------------
 Software License for The Fraunhofer FDK AAC Codec Library for Android
 
-© Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+© Copyright  1995 - 2015 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
   All rights reserved.
 
  1.    INTRODUCTION
@@ -363,7 +363,8 @@ static INT FDKaacEnc_improveScf(FIXP_DBL *spec,
                       INT scf,
                       INT minScf,
                       FIXP_DBL  *distLdData,
-                      INT *minScfCalculated
+                      INT *minScfCalculated,
+                      INT dZoneQuantEnable
                       )
 {
    FIXP_DBL sfbDistLdData;
@@ -375,7 +376,8 @@ static INT FDKaacEnc_improveScf(FIXP_DBL *spec,
    sfbDistLdData = FDKaacEnc_calcSfbDist(spec,
                                          quantSpec,
                                          sfbWidth,
-                                         scf);
+                                         scf,
+                                         dZoneQuantEnable);
    *minScfCalculated = scf;
    /* nmr > 1.25 -> try to improve nmr */
    if (sfbDistLdData > (threshLdData-distFactorLdData)) {
@@ -390,7 +392,8 @@ static INT FDKaacEnc_improveScf(FIXP_DBL *spec,
          sfbDistLdData = FDKaacEnc_calcSfbDist(spec,
                                                quantSpecTmp,
                                                sfbWidth,
-                                               scf);
+                                               scf,
+                                               dZoneQuantEnable);
 
          if (sfbDistLdData < sfbDistBestLdData) {
             scfBest = scf;
@@ -408,7 +411,8 @@ static INT FDKaacEnc_improveScf(FIXP_DBL *spec,
          sfbDistLdData = FDKaacEnc_calcSfbDist(spec,
                                                quantSpecTmp,
                                                sfbWidth,
-                                               scf);
+                                               scf,
+                                               dZoneQuantEnable);
 
          if (sfbDistLdData < sfbDistBestLdData) {
             scfBest = scf;
@@ -429,7 +433,8 @@ static INT FDKaacEnc_improveScf(FIXP_DBL *spec,
          sfbDistLdData = FDKaacEnc_calcSfbDist(spec,
                                                quantSpecTmp,
                                                sfbWidth,
-                                               scf);
+                                               scf,
+                                               dZoneQuantEnable);
 
          if (sfbDistLdData < sfbDistAllowedLdData) {
            *minScfCalculated = scfBest+1;
@@ -454,6 +459,7 @@ static void FDKaacEnc_assimilateSingleScf(PSY_OUT_CHANNEL *psyOutChan,
                                 QC_OUT_CHANNEL   *qcOutChannel,
                                 SHORT *quantSpec,
                                 SHORT *quantSpecTmp,
+                                INT dZoneQuantEnable,
                                 INT *scf,
                                 INT *minScf,
                                 FIXP_DBL *sfbDist,
@@ -570,7 +576,8 @@ static void FDKaacEnc_assimilateSingleScf(PSY_OUT_CHANNEL *psyOutChan,
             sfbDistNew = FDKaacEnc_calcSfbDist(qcOutChannel->mdctSpectrum+sfbOffs,
                                                quantSpecTmp+sfbOffs,
                                                sfbWidth,
-                                               scfAct);
+                                               scfAct,
+                                               dZoneQuantEnable);
 
             if (sfbDistNew < sfbDist[sfbAct]) {
               /* success, replace scf by new one */
@@ -629,6 +636,7 @@ static void FDKaacEnc_assimilateMultipleScf(PSY_OUT_CHANNEL *psyOutChan,
                                   QC_OUT_CHANNEL  *qcOutChannel,
                                   SHORT *quantSpec,
                                   SHORT *quantSpecTmp,
+                                  INT dZoneQuantEnable,
                                   INT *scf,
                                   INT *minScf,
                                   FIXP_DBL *sfbDist,
@@ -724,7 +732,8 @@ static void FDKaacEnc_assimilateMultipleScf(PSY_OUT_CHANNEL *psyOutChan,
                 sfbDistNew[sfb] = FDKaacEnc_calcSfbDist(qcOutChannel->mdctSpectrum+sfbOffs,
                                               quantSpecTmp+sfbOffs,
                                               sfbWidth,
-                                              scfAct);
+                                              scfAct,
+                                              dZoneQuantEnable);
 
                 if (sfbDistNew[sfb] >qcOutChannel->sfbThresholdLdData[sfb]) {
                   /* no improvement, skip further dist. calculations */
@@ -768,6 +777,7 @@ static void FDKaacEnc_FDKaacEnc_assimilateMultipleScf2(PSY_OUT_CHANNEL *psyOutCh
                                    QC_OUT_CHANNEL  *qcOutChannel,
                                    SHORT *quantSpec,
                                    SHORT *quantSpecTmp,
+                                   INT dZoneQuantEnable,
                                    INT *scf,
                                    INT *minScf,
                                    FIXP_DBL *sfbDist,
@@ -883,7 +893,8 @@ static void FDKaacEnc_FDKaacEnc_assimilateMultipleScf2(PSY_OUT_CHANNEL *psyOutCh
                 sfbDistNew[sfb] = FDKaacEnc_calcSfbDist(qcOutChannel->mdctSpectrum+sfbOffs[sfb],
                                               quantSpecTmp+sfbOffs[sfb],
                                               sfbOffs[sfb+1]-sfbOffs[sfb],
-                                              scfNew);
+                                              scfNew,
+                                              dZoneQuantEnable);
 
                 if (sfbDistNew[sfb] > sfbDistMax[sfb]) {
                   /* no improvement, skip further dist. calculations */
@@ -963,7 +974,8 @@ static void FDKaacEnc_FDKaacEnc_assimilateMultipleScf2(PSY_OUT_CHANNEL *psyOutCh
               sfbDistNew[sfb] = FDKaacEnc_calcSfbDist(qcOutChannel->mdctSpectrum+sfbOffs[sfb],
                                                       quantSpecTmp+sfbOffs[sfb],
                                                       sfbOffs[sfb+1]-sfbOffs[sfb],
-                                                      scfNew);
+                                                      scfNew,
+                                                      dZoneQuantEnable);
 
               if (sfbDistNew[sfb] > qcOutChannel->sfbThresholdLdData[sfb]) {
                 /* no improvement, skip further dist. calculations */
@@ -1058,7 +1070,8 @@ FDKaacEnc_FDKaacEnc_EstimateScaleFactorsChannel(QC_OUT_CHANNEL   *qcOutChannel,
                             INT *RESTRICT globalGain,
                             FIXP_DBL *RESTRICT sfbFormFactorLdData
                             ,const INT invQuant,
-                            SHORT *RESTRICT quantSpec
+                            SHORT *RESTRICT quantSpec,
+                            const INT dZoneQuantEnable
                             )
 {
   INT i, j, sfb, sfbOffs;
@@ -1160,7 +1173,8 @@ FDKaacEnc_FDKaacEnc_EstimateScaleFactorsChannel(QC_OUT_CHANNEL   *qcOutChannel,
                               quantSpecTmp+psyOutChannel->sfbOffsets[sfbOffs+sfb],
                               psyOutChannel->sfbOffsets[sfbOffs+sfb+1]-psyOutChannel->sfbOffsets[sfbOffs+sfb],
                               threshLdData, scfInt, minSfMaxQuant[sfbOffs+sfb],
-                              &sfbDistLdData[sfbOffs+sfb], &minScfCalculated[sfbOffs+sfb]
+                              &sfbDistLdData[sfbOffs+sfb], &minScfCalculated[sfbOffs+sfb],
+                              dZoneQuantEnable
                               );
         }
         scf[sfbOffs+sfb] = scfInt;
@@ -1187,20 +1201,32 @@ FDKaacEnc_FDKaacEnc_EstimateScaleFactorsChannel(QC_OUT_CHANNEL   *qcOutChannel,
                           sfbNRelevantLines);
 
 
-    FDKaacEnc_assimilateSingleScf(psyOutChannel, qcOutChannel, quantSpec, quantSpecTmp, scf,
+    FDKaacEnc_assimilateSingleScf(psyOutChannel, qcOutChannel, quantSpec, quantSpecTmp,
+                        dZoneQuantEnable,
+                        scf,
                         minSfMaxQuant, sfbDistLdData, sfbConstPePart,
                         sfbFormFactorLdData, sfbNRelevantLines, minScfCalculated, 1);
 
+    if(invQuant > 1) {
+      FDKaacEnc_assimilateMultipleScf(psyOutChannel, qcOutChannel, quantSpec, quantSpecTmp,
+                        dZoneQuantEnable,
+                        scf,
+                        minSfMaxQuant, sfbDistLdData, sfbConstPePart,
+                        sfbFormFactorLdData, sfbNRelevantLines);
 
-    FDKaacEnc_assimilateMultipleScf(psyOutChannel, qcOutChannel, quantSpec, quantSpecTmp, scf,
-                          minSfMaxQuant, sfbDistLdData, sfbConstPePart,
-                          sfbFormFactorLdData, sfbNRelevantLines);
-
+      FDKaacEnc_assimilateMultipleScf(psyOutChannel, qcOutChannel, quantSpec, quantSpecTmp,
+                        dZoneQuantEnable,
+                        scf,
+                        minSfMaxQuant, sfbDistLdData, sfbConstPePart,
+                        sfbFormFactorLdData, sfbNRelevantLines);
 
-    FDKaacEnc_FDKaacEnc_assimilateMultipleScf2(psyOutChannel, qcOutChannel, quantSpec, quantSpecTmp, scf,
-                           minSfMaxQuant, sfbDistLdData, sfbConstPePart,
-                           sfbFormFactorLdData, sfbNRelevantLines);
 
+      FDKaacEnc_FDKaacEnc_assimilateMultipleScf2(psyOutChannel, qcOutChannel, quantSpec, quantSpecTmp,
+                        dZoneQuantEnable,
+                        scf,
+                        minSfMaxQuant, sfbDistLdData, sfbConstPePart,
+                        sfbFormFactorLdData, sfbNRelevantLines);
+    }
   }
 
 
@@ -1223,7 +1249,8 @@ FDKaacEnc_FDKaacEnc_EstimateScaleFactorsChannel(QC_OUT_CHANNEL   *qcOutChannel,
                FDKaacEnc_calcSfbDist(qcOutChannel->mdctSpectrum+psyOutChannel->sfbOffsets[sfbOffs+sfb],
                                      quantSpec+psyOutChannel->sfbOffsets[sfbOffs+sfb],
                                      psyOutChannel->sfbOffsets[sfbOffs+sfb+1]-psyOutChannel->sfbOffsets[sfbOffs+sfb],
-                                     scf[sfbOffs+sfb]
+                                     scf[sfbOffs+sfb],
+                                     dZoneQuantEnable
                                      );
         }
       }
@@ -1281,6 +1308,7 @@ void
 FDKaacEnc_EstimateScaleFactors(PSY_OUT_CHANNEL *psyOutChannel[],
                      QC_OUT_CHANNEL* qcOutChannel[],
                      const int invQuant,
+                     const INT dZoneQuantEnable,
                      const int nChannels)
 {
   int ch;
@@ -1293,7 +1321,8 @@ FDKaacEnc_EstimateScaleFactors(PSY_OUT_CHANNEL *psyOutChannel[],
                                   &qcOutChannel[ch]->globalGain,
                                   qcOutChannel[ch]->sfbFormFactorLdData
                                   ,invQuant,
-                                  qcOutChannel[ch]->quantSpec
+                                  qcOutChannel[ch]->quantSpec,
+                                  dZoneQuantEnable
                                   );
   }
 
diff --git a/libAACenc/src/sf_estim.h b/libAACenc/src/sf_estim.h
index b5ac000..ef8d366 100644
--- a/libAACenc/src/sf_estim.h
+++ b/libAACenc/src/sf_estim.h
@@ -2,7 +2,7 @@
 /* -----------------------------------------------------------------------------------------------------------
 Software License for The Fraunhofer FDK AAC Codec Library for Android
 
-© Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+© Copyright  1995 - 2015 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
   All rights reserved.
 
  1.    INTRODUCTION
@@ -110,6 +110,7 @@ void
 FDKaacEnc_EstimateScaleFactors(PSY_OUT_CHANNEL *psyOutChannel[],
                      QC_OUT_CHANNEL* qcOutChannel[],
                      const int invQuant,
+                     const INT dZoneQuantEnable,
                      const int nChannels);
 
 
diff --git a/libAACenc/src/tns_func.h b/libAACenc/src/tns_func.h
index 6ee0edb..5e5265d 100644
--- a/libAACenc/src/tns_func.h
+++ b/libAACenc/src/tns_func.h
@@ -2,7 +2,7 @@
 /* -----------------------------------------------------------------------------------------------------------
 Software License for The Fraunhofer FDK AAC Codec Library for Android
 
-© Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+© Copyright  1995 - 2015 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
   All rights reserved.
 
  1.    INTRODUCTION
@@ -100,6 +100,7 @@ AAC_ENCODER_ERROR FDKaacEnc_InitTnsConfiguration(INT bitrate,
                          INT channels,
                          INT blocktype,
                          INT granuleLength,
+                         INT isLowDelay,
                          INT ldSbrPresent,
                          TNS_CONFIG *tnsConfig,
                          PSY_CONFIGURATION *psyConfig,