Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5

1 files changed, 1333 insertions, 0 deletions

diff --git a/libSBRdec/src/env_extr.cpp b/libSBRdec/src/env_extr.cpp
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+/****************************************************************************
+
+                     (C) Copyright Fraunhofer IIS (2005)
+                               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  Envelope extraction $Revision: 36841 $
+  The functions provided by this module are mostly called by applySBR(). After it is
+  determined that there is valid SBR data, sbrGetHeaderData() might be called if the current
+  SBR data contains an \ref SBR_HEADER_ELEMENT as opposed to a \ref SBR_STANDARD_ELEMENT. This function
+  may return various error codes as defined in #SBR_HEADER_STATUS . Most importantly it returns HEADER_RESET when decoder
+  settings need to be recalculated according to the SBR specifications. In that case applySBR()
+  will initiatite the required re-configuration.
+
+  The header data is stored in a #SBR_HEADER_DATA structure.
+
+  The actual SBR data for the current frame is decoded into SBR_FRAME_DATA stuctures by sbrGetChannelPairElement()
+  [for stereo streams] and sbrGetSingleChannelElement() [for mono streams]. There is no fractional arithmetic involved.
+
+  Once the information is extracted, the data needs to be further prepared before the actual decoding process.
+  This is done in decodeSbrData().
+
+  \sa Description of buffer management in applySBR(). \ref documentationOverview
+
+  <h1>About the SBR data format:</h1>
+
+  Each frame includes SBR data (side chain information), and can be either the \ref SBR_HEADER_ELEMENT or the \ref SBR_STANDARD_ELEMENT.
+  Parts of the data can be protected by a CRC checksum.
+
+  \anchor SBR_HEADER_ELEMENT <h2>The SBR_HEADER_ELEMENT</h2>
+
+  The SBR_HEADER_ELEMENT can be transmitted with every frame, however, it typically is send every second or so. It contains fundamental
+  information such as SBR sampling frequency and frequency range as well as control signals that do not require frequent changes. It also
+  includes the \ref SBR_STANDARD_ELEMENT.
+
+  Depending on the changes between the information in a current SBR_HEADER_ELEMENT and the previous SBR_HEADER_ELEMENT, the SBR decoder might need
+  to be reset and reconfigured (e.g. new tables need to be calculated).
+
+  \anchor SBR_STANDARD_ELEMENT <h2>The SBR_STANDARD_ELEMENT</h2>
+
+  This data can be subdivided into "side info" and "raw data", where side info is defined as signals needed to decode the raw data
+  and some decoder tuning signals. Raw data is referred to as PCM and Huffman coded envelope and noise floor estimates. The side info also
+  includes information about the time-frequency grid for the current frame.
+
+  \sa \ref documentationOverview
+*/
+
+#include "env_extr.h"
+
+#include "sbr_ram.h"
+#include "sbr_rom.h"
+#include "huff_dec.h"
+
+
+#include "psbitdec.h"
+
+#define DRM_PARAMETRIC_STEREO   0
+#define EXTENSION_ID_PS_CODING  2
+
+
+static int extractFrameInfo (HANDLE_FDK_BITSTREAM   hBs,
+                             HANDLE_SBR_HEADER_DATA hHeaderData,
+                             HANDLE_SBR_FRAME_DATA  h_frame_data,
+                             const UINT             nrOfChannels,
+                             const UINT             flags
+                            );
+
+
+static int sbrGetEnvelope (HANDLE_SBR_HEADER_DATA hHeaderData,
+                           HANDLE_SBR_FRAME_DATA  h_frame_data,
+                           HANDLE_FDK_BITSTREAM   hBs,
+                           const UINT flags);
+
+static void sbrGetDirectionControlData (HANDLE_SBR_FRAME_DATA hFrameData,
+                                        HANDLE_FDK_BITSTREAM hBs);
+
+static void sbrGetNoiseFloorData (HANDLE_SBR_HEADER_DATA hHeaderData,
+                                  HANDLE_SBR_FRAME_DATA  h_frame_data,
+                                  HANDLE_FDK_BITSTREAM   hBs);
+
+static int checkFrameInfo (FRAME_INFO *pFrameInfo, int numberOfTimeSlots, int overlap, int timeStep);
+
+SBR_ERROR
+initHeaderData (
+        HANDLE_SBR_HEADER_DATA  hHeaderData,
+        const int               sampleRateIn,
+        const int               sampleRateOut,
+        const int               samplesPerFrame,
+        const UINT              flags
+        )
+{
+  HANDLE_FREQ_BAND_DATA hFreq = &hHeaderData->freqBandData;
+  SBR_ERROR sbrError = SBRDEC_OK;
+  int numAnalysisBands;
+
+  if ( sampleRateIn == sampleRateOut ) {
+    hHeaderData->sbrProcSmplRate = sampleRateOut<<1;
+    numAnalysisBands = 32;
+  } else {
+    hHeaderData->sbrProcSmplRate = sampleRateOut;
+    if ( (sampleRateOut>>1) == sampleRateIn) {
+      /* 1:2 */
+      numAnalysisBands = 32;
+    } else if ( (sampleRateOut>>2) == sampleRateIn ) {
+      /* 1:4 */
+      numAnalysisBands = 32;
+    } else if ( (sampleRateOut*3)>>3 == (sampleRateIn*8)>>3 ) {
+      /* 3:8, 3/4 core frame length */
+      numAnalysisBands = 24;
+    } else {
+      sbrError = SBRDEC_UNSUPPORTED_CONFIG;
+      goto bail;
+    }
+  }
+
+  /* Fill in default values first */
+  hHeaderData->syncState          = SBR_NOT_INITIALIZED;
+  hHeaderData->status             = 0;
+  hHeaderData->frameErrorFlag     = 0;
+
+  hHeaderData->bs_info.ampResolution     = 1;
+  hHeaderData->bs_info.xover_band        = 0;
+  hHeaderData->bs_info.sbr_preprocessing = 0;
+
+  hHeaderData->bs_data.startFreq       = 5;
+  hHeaderData->bs_data.stopFreq        = 0;
+  hHeaderData->bs_data.freqScale       = 2;
+  hHeaderData->bs_data.alterScale      = 1;
+  hHeaderData->bs_data.noise_bands     = 2;
+  hHeaderData->bs_data.limiterBands    = 2;
+  hHeaderData->bs_data.limiterGains    = 2;
+  hHeaderData->bs_data.interpolFreq    = 1;
+  hHeaderData->bs_data.smoothingLength = 1;
+
+  hHeaderData->timeStep = (flags & SBRDEC_ELD_GRID) ? 1 : 2;
+
+  /* Setup pointers to frequency band tables */
+  hFreq->freqBandTable[0]  = hFreq->freqBandTableLo;
+  hFreq->freqBandTable[1] = hFreq->freqBandTableHi;
+
+  /* Patch some entries */
+  if (sampleRateOut > 24000) {    /* Trigger an error if SBR is going to be processed without     */
+    hHeaderData->bs_data.startFreq = 7;   /*   having read these frequency values from bit stream before. */
+    hHeaderData->bs_data.stopFreq  = 3;
+  }
+
+  /* One SBR timeslot corresponds to the amount of samples equal to the amount of analysis bands, divided by the timestep. */
+  hHeaderData->numberTimeSlots = (samplesPerFrame/numAnalysisBands) >> (hHeaderData->timeStep - 1);
+  hHeaderData->numberOfAnalysisBands = numAnalysisBands;
+
+bail:
+  return sbrError;
+}
+
+
+/*!
+  \brief   Initialize the SBR_PREV_FRAME_DATA struct
+*/
+void
+initSbrPrevFrameData (HANDLE_SBR_PREV_FRAME_DATA h_prev_data, /*!< handle to struct SBR_PREV_FRAME_DATA */
+                      int timeSlots)                          /*!< Framelength in SBR-timeslots */
+{
+  int i;
+
+  /* Set previous energy and noise levels to 0 for the case
+     that decoding starts in the middle of a bitstream */
+  for (i=0; i < MAX_FREQ_COEFFS; i++)
+    h_prev_data->sfb_nrg_prev[i] = (FIXP_DBL)0;
+  for (i=0; i < MAX_NOISE_COEFFS; i++)
+    h_prev_data->prevNoiseLevel[i] = (FIXP_DBL)0;
+  for (i=0; i < MAX_INVF_BANDS; i++)
+    h_prev_data->sbr_invf_mode[i] = INVF_OFF;
+
+  h_prev_data->stopPos = timeSlots;
+  h_prev_data->coupling = COUPLING_OFF;
+  h_prev_data->ampRes = 0;
+}
+
+
+/*!
+  \brief   Read header data from bitstream
+
+  \return  error status - 0 if ok
+*/
+SBR_HEADER_STATUS
+sbrGetHeaderData (HANDLE_SBR_HEADER_DATA hHeaderData,
+                  HANDLE_FDK_BITSTREAM   hBs,
+                  const UINT             flags,
+                  const int              fIsSbrData)
+{
+  SBR_HEADER_DATA_BS *pBsData;
+  SBR_HEADER_DATA_BS lastHeader;
+  SBR_HEADER_DATA_BS_INFO lastInfo;
+  int headerExtra1=0, headerExtra2=0;
+
+  /* Copy SBR bit stream header to temporary header */
+  lastHeader = hHeaderData->bs_data;
+  lastInfo   = hHeaderData->bs_info;
+
+  /* Read new header from bitstream */
+  {
+    pBsData = &hHeaderData->bs_data;
+  }
+
+  {
+    hHeaderData->bs_info.ampResolution = FDKreadBits (hBs, 1);
+  }
+
+  pBsData->startFreq = FDKreadBits (hBs, 4);
+  pBsData->stopFreq = FDKreadBits (hBs, 4);
+
+  {
+    hHeaderData->bs_info.xover_band = FDKreadBits (hBs, 3);
+    FDKreadBits (hBs, 2);
+  }
+
+  headerExtra1 = FDKreadBits (hBs, 1);
+  headerExtra2 = FDKreadBits (hBs, 1);
+
+  /* Handle extra header information */
+  if( headerExtra1) 
+  {
+    pBsData->freqScale = FDKreadBits (hBs, 2);
+    pBsData->alterScale = FDKreadBits (hBs, 1);
+    pBsData->noise_bands = FDKreadBits (hBs, 2);
+  }
+  else {
+    pBsData->freqScale   = 2;
+    pBsData->alterScale  = 1;
+    pBsData->noise_bands = 2;
+  }
+
+  if (headerExtra2) {
+    pBsData->limiterBands = FDKreadBits (hBs, 2);
+    pBsData->limiterGains = FDKreadBits (hBs, 2);
+    pBsData->interpolFreq = FDKreadBits (hBs, 1);
+    pBsData->smoothingLength = FDKreadBits (hBs, 1);
+  }
+  else {
+    pBsData->limiterBands    = 2;
+    pBsData->limiterGains    = 2;
+    pBsData->interpolFreq    = 1;
+    pBsData->smoothingLength = 1;
+  }
+
+  /* Look for new settings. IEC 14496-3, 4.6.18.3.1 */
+  if(hHeaderData->syncState != SBR_ACTIVE ||
+     lastHeader.startFreq   != pBsData->startFreq   ||
+     lastHeader.stopFreq    != pBsData->stopFreq    ||
+     lastHeader.freqScale   != pBsData->freqScale   ||
+     lastHeader.alterScale  != pBsData->alterScale  ||
+     lastHeader.noise_bands != pBsData->noise_bands ||
+     lastInfo.xover_band    != hHeaderData->bs_info.xover_band) {
+    return HEADER_RESET; /* New settings */
+  }
+
+  return HEADER_OK;
+}
+
+/*!
+  \brief   Get missing harmonics parameters (only used for AAC+SBR)
+
+  \return  error status - 0 if ok
+*/
+int
+sbrGetSyntheticCodedData(HANDLE_SBR_HEADER_DATA hHeaderData,
+                         HANDLE_SBR_FRAME_DATA  hFrameData,
+                         HANDLE_FDK_BITSTREAM   hBs)
+{
+  int i, bitsRead = 0;
+
+  int flag = FDKreadBits(hBs,1);
+  bitsRead++;
+
+  if(flag){
+    for(i=0;i<hHeaderData->freqBandData.nSfb[1];i++){
+      hFrameData->addHarmonics[i]  = FDKreadBits (hBs, 1 );
+      bitsRead++;
+    }
+  }
+  else {
+    for(i=0; i<MAX_FREQ_COEFFS; i++)
+      hFrameData->addHarmonics[i]  = 0;
+  }
+  return(bitsRead);
+}
+
+/*!
+  \brief      Reads extension data from the bitstream
+
+  The bitstream format allows up to 4 kinds of extended data element.
+  Extended data may contain several elements, each identified by a 2-bit-ID.
+  So far, no extended data elements are defined hence the first 2 parameters
+  are unused. The data should be skipped in order to update the number
+  of read bits for the consistency check in applySBR().
+*/
+static int  extractExtendedData(
+                                HANDLE_SBR_HEADER_DATA hHeaderData,    /*!< handle to SBR header */
+                                HANDLE_FDK_BITSTREAM   hBs             /*!< Handle to the bit buffer */
+                               ,HANDLE_PS_DEC hParametricStereoDec     /*!< Parametric Stereo Decoder */
+                                ) {
+  INT nBitsLeft;
+  int extended_data;
+  int i, frameOk = 1;
+
+
+  extended_data = FDKreadBits(hBs, 1);
+
+  if (extended_data) {
+    int cnt;
+    int bPsRead = 0;
+
+    cnt = FDKreadBits(hBs, 4);
+    if (cnt == (1<<4)-1)
+      cnt += FDKreadBits(hBs, 8);
+
+
+    nBitsLeft = 8 * cnt;
+
+    /* sanity check for cnt */
+    if (nBitsLeft > (INT)FDKgetValidBits(hBs)) {
+      /* limit nBitsLeft */
+      nBitsLeft = (INT)FDKgetValidBits(hBs);
+      /* set frame error */
+      frameOk = 0;
+    }
+
+    while (nBitsLeft > 7) {
+      int extension_id = FDKreadBits(hBs, 2);
+      nBitsLeft -= 2;
+
+      switch(extension_id) {
+
+
+
+        case EXTENSION_ID_PS_CODING:
+
+        /* Read PS data from bitstream */
+
+        if (hParametricStereoDec != NULL) {
+          if(bPsRead && !hParametricStereoDec->bsData[hParametricStereoDec->bsReadSlot].mpeg.bPsHeaderValid) {
+            cnt = nBitsLeft >> 3; /* number of remaining bytes */
+            for (i=0; i<cnt; i++)
+              FDKreadBits(hBs, 8);
+            nBitsLeft -= cnt * 8;
+          } else {
+            nBitsLeft -= ReadPsData(hParametricStereoDec, hBs, nBitsLeft);
+            bPsRead = 1;
+          }
+        }
+
+          /* parametric stereo detected, could set channelMode accordingly here  */
+          /*                                                                     */
+          /* "The usage of this parametric stereo extension to HE-AAC is         */
+          /* signalled implicitly in the bitstream. Hence, if an sbr_extension() */
+          /* with bs_extension_id==EXTENSION_ID_PS is found in the SBR part of   */
+          /* the bitstream, a decoder supporting the combination of SBR and PS   */
+          /* shall operate the PS tool to generate a stereo output signal."      */
+          /* source: ISO/IEC 14496-3:2001/FDAM 2:2004(E)                         */
+
+        break;
+
+
+      default:
+        cnt = nBitsLeft >> 3; /* number of remaining bytes */
+        for (i=0; i<cnt; i++)
+          FDKreadBits(hBs, 8);
+        nBitsLeft -= cnt * 8;
+        break;
+      }
+    }
+
+    if (nBitsLeft < 0) {
+      frameOk = 0;
+      goto bail;
+    }
+    else {
+      /* Read fill bits for byte alignment */
+      FDKreadBits(hBs, nBitsLeft);
+    }
+  }
+
+bail:
+  return (frameOk);
+}
+
+
+/*!
+  \brief   Read bitstream elements of one channel
+
+  \return  SbrFrameOK:  1=ok, 0=error
+*/
+int
+sbrGetSingleChannelElement (HANDLE_SBR_HEADER_DATA hHeaderData,          /*!< Static control data */
+                            HANDLE_SBR_FRAME_DATA  hFrameData,           /*!< Control data of current frame */
+                            HANDLE_FDK_BITSTREAM   hBs,                  /*!< Handle to struct BIT_BUF */
+                            HANDLE_PS_DEC          hParametricStereoDec, /*!< Handle to PS decoder */
+                            const UINT             flags,
+                            const int              overlap
+                           )
+{
+  int i;
+
+
+  hFrameData->coupling = COUPLING_OFF;
+
+  {
+    /* Reserved bits */
+    if (FDKreadBits(hBs, 1)) {  /* bs_data_extra */
+      FDKreadBits(hBs, 4);
+      if (flags & SBRDEC_SYNTAX_SCAL) {
+        FDKreadBits(hBs, 4);
+      }
+    }
+  }
+
+  if (flags & SBRDEC_SYNTAX_SCAL) {
+    FDKreadBits (hBs, 1);     /* bs_coupling */
+  }
+
+  /*
+    Grid control
+  */
+  if ( !extractFrameInfo ( hBs, hHeaderData, hFrameData, 1, flags) )
+   return 0;
+
+  if ( !checkFrameInfo (&hFrameData->frameInfo, hHeaderData->numberTimeSlots, overlap, hHeaderData->timeStep) )
+    return 0;
+
+
+  /*
+    Fetch domain vectors (time or frequency direction for delta-coding)
+  */
+  sbrGetDirectionControlData (hFrameData, hBs);
+
+  for (i=0; i<hHeaderData->freqBandData.nInvfBands; i++) {
+    hFrameData->sbr_invf_mode[i] =
+      (INVF_MODE) FDKreadBits (hBs, 2);
+  }
+
+
+
+  /* raw data */
+  if ( !sbrGetEnvelope (hHeaderData, hFrameData, hBs, flags) )
+    return 0;
+
+
+  sbrGetNoiseFloorData (hHeaderData, hFrameData, hBs);
+
+  sbrGetSyntheticCodedData(hHeaderData, hFrameData, hBs);
+
+  {
+    /* sbr extended data */
+    if (! extractExtendedData(
+                               hHeaderData,
+                               hBs
+                              ,hParametricStereoDec
+                               )) {
+      return 0;
+    }
+  }
+
+  return 1;
+}
+
+
+
+/*!
+  \brief      Read bitstream elements of a channel pair
+  \return     SbrFrameOK
+*/
+int
+sbrGetChannelPairElement (HANDLE_SBR_HEADER_DATA hHeaderData,    /*!< Static control data */
+                          HANDLE_SBR_FRAME_DATA  hFrameDataLeft, /*!< Dynamic control data for first channel */
+                          HANDLE_SBR_FRAME_DATA  hFrameDataRight,/*!< Dynamic control data for second channel */
+                          HANDLE_FDK_BITSTREAM   hBs,            /*!< handle to struct BIT_BUF */
+                          const UINT flags,
+                          const int overlap )
+{
+  int i, bit;
+
+
+  /* Reserved bits */
+  if (FDKreadBits(hBs, 1)) {  /* bs_data_extra */
+    FDKreadBits(hBs, 4);
+    FDKreadBits(hBs, 4);
+  }
+
+  /* Read coupling flag */
+  bit = FDKreadBits (hBs, 1);
+
+  if (bit) {
+    hFrameDataLeft->coupling = COUPLING_LEVEL;
+    hFrameDataRight->coupling = COUPLING_BAL;
+  }
+  else {
+    hFrameDataLeft->coupling = COUPLING_OFF;
+    hFrameDataRight->coupling = COUPLING_OFF;
+  }
+
+
+  /*
+    Grid control
+  */
+  if ( !extractFrameInfo (hBs, hHeaderData, hFrameDataLeft, 2, flags) )
+    return 0;
+
+  if ( !checkFrameInfo (&hFrameDataLeft->frameInfo, hHeaderData->numberTimeSlots, overlap, hHeaderData->timeStep) )
+    return 0;
+
+  if (hFrameDataLeft->coupling) {
+    FDKmemcpy (&hFrameDataRight->frameInfo, &hFrameDataLeft->frameInfo, sizeof(FRAME_INFO));
+    hFrameDataRight->ampResolutionCurrentFrame = hFrameDataLeft->ampResolutionCurrentFrame;
+  }
+  else {
+    if ( !extractFrameInfo (hBs, hHeaderData, hFrameDataRight, 2, flags) )
+      return 0;
+
+    if ( !checkFrameInfo (&hFrameDataRight->frameInfo, hHeaderData->numberTimeSlots, overlap, hHeaderData->timeStep) )
+      return 0;
+  }
+
+  /*
+    Fetch domain vectors (time or frequency direction for delta-coding)
+  */
+  sbrGetDirectionControlData (hFrameDataLeft, hBs);
+  sbrGetDirectionControlData (hFrameDataRight, hBs);
+
+  for (i=0; i<hHeaderData->freqBandData.nInvfBands; i++) {
+    hFrameDataLeft->sbr_invf_mode[i] = (INVF_MODE) FDKreadBits (hBs, 2);
+  }
+
+  if (hFrameDataLeft->coupling) {
+    for (i=0; i<hHeaderData->freqBandData.nInvfBands; i++) {
+      hFrameDataRight->sbr_invf_mode[i] = hFrameDataLeft->sbr_invf_mode[i];
+    }
+
+
+    if ( !sbrGetEnvelope (hHeaderData, hFrameDataLeft, hBs, flags) ) {
+      return 0;
+    }
+
+    sbrGetNoiseFloorData (hHeaderData, hFrameDataLeft, hBs);
+
+    if ( !sbrGetEnvelope (hHeaderData, hFrameDataRight, hBs, flags) ) {
+      return 0;
+    }
+  }
+  else {
+
+    for (i=0; i<hHeaderData->freqBandData.nInvfBands; i++) {
+      hFrameDataRight->sbr_invf_mode[i] = (INVF_MODE) FDKreadBits (hBs, 2);
+    }
+
+
+
+    if ( !sbrGetEnvelope (hHeaderData, hFrameDataLeft, hBs, flags) )
+      return 0;
+
+    if ( !sbrGetEnvelope (hHeaderData, hFrameDataRight, hBs, flags) )
+      return 0;
+
+    sbrGetNoiseFloorData (hHeaderData, hFrameDataLeft, hBs);
+
+  }
+  sbrGetNoiseFloorData (hHeaderData, hFrameDataRight, hBs);
+
+  sbrGetSyntheticCodedData(hHeaderData, hFrameDataLeft, hBs);
+  sbrGetSyntheticCodedData(hHeaderData, hFrameDataRight, hBs);
+
+  {
+    if (! extractExtendedData(
+                               hHeaderData,
+                               hBs
+                              ,NULL
+                             ) ) {
+      return 0;
+    }
+  }
+
+  return 1;
+}
+
+
+
+
+/*!
+  \brief   Read direction control data from bitstream
+*/
+void
+sbrGetDirectionControlData (HANDLE_SBR_FRAME_DATA h_frame_data, /*!< handle to struct SBR_FRAME_DATA */
+                            HANDLE_FDK_BITSTREAM  hBs)          /*!< handle to struct BIT_BUF */
+{
+  int i;
+
+  for (i = 0; i < h_frame_data->frameInfo.nEnvelopes; i++) {
+    h_frame_data->domain_vec[i] = FDKreadBits (hBs, 1);
+  }
+
+  for (i = 0; i < h_frame_data->frameInfo.nNoiseEnvelopes; i++) {
+    h_frame_data->domain_vec_noise[i] = FDKreadBits (hBs, 1);
+  }
+}
+
+
+
+/*!
+  \brief   Read noise-floor-level data from bitstream
+*/
+void
+sbrGetNoiseFloorData (HANDLE_SBR_HEADER_DATA hHeaderData,  /*!< Static control data */
+                      HANDLE_SBR_FRAME_DATA  h_frame_data, /*!< handle to struct SBR_FRAME_DATA */
+                      HANDLE_FDK_BITSTREAM   hBs)          /*!< handle to struct BIT_BUF */
+{
+  int i,j;
+  int delta;
+  COUPLING_MODE coupling;
+  int noNoiseBands = hHeaderData->freqBandData.nNfb;
+
+  Huffman hcb_noiseF;
+  Huffman hcb_noise;
+  int envDataTableCompFactor;
+
+  coupling = h_frame_data->coupling;
+
+
+  /*
+    Select huffman codebook depending on coupling mode
+  */
+  if (coupling == COUPLING_BAL) {
+    hcb_noise = (Huffman)&FDK_sbrDecoder_sbr_huffBook_NoiseBalance11T;
+    hcb_noiseF = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvBalance11F;  /* "sbr_huffBook_NoiseBalance11F" */
+    envDataTableCompFactor = 1;
+  }
+  else {
+    hcb_noise = (Huffman)&FDK_sbrDecoder_sbr_huffBook_NoiseLevel11T;
+    hcb_noiseF = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvLevel11F;    /* "sbr_huffBook_NoiseLevel11F" */
+    envDataTableCompFactor = 0;
+  }
+
+  /*
+    Read raw noise-envelope data
+  */
+  for (i=0; i<h_frame_data->frameInfo.nNoiseEnvelopes; i++) {
+
+
+    if (h_frame_data->domain_vec_noise[i] == 0) {
+      if (coupling == COUPLING_BAL) {
+        h_frame_data->sbrNoiseFloorLevel[i*noNoiseBands] =
+          (FIXP_SGL) (((int)FDKreadBits (hBs, 5)) << envDataTableCompFactor);
+      }
+      else {
+        h_frame_data->sbrNoiseFloorLevel[i*noNoiseBands] =
+          (FIXP_SGL) (int)FDKreadBits (hBs, 5);
+      }
+
+      for (j = 1; j < noNoiseBands; j++) {
+        delta = DecodeHuffmanCW(hcb_noiseF, hBs);
+        h_frame_data->sbrNoiseFloorLevel[i*noNoiseBands+j] = (FIXP_SGL) (delta << envDataTableCompFactor);
+      }
+    }
+    else {
+      for (j = 0; j < noNoiseBands; j++) {
+        delta = DecodeHuffmanCW(hcb_noise, hBs);
+        h_frame_data->sbrNoiseFloorLevel[i*noNoiseBands+j] = (FIXP_SGL) (delta << envDataTableCompFactor);
+      }
+    }
+  }
+}
+
+
+/*!
+  \brief   Read envelope data from bitstream
+*/
+static int
+sbrGetEnvelope (HANDLE_SBR_HEADER_DATA hHeaderData,  /*!< Static control data */
+                HANDLE_SBR_FRAME_DATA  h_frame_data, /*!< handle to struct SBR_FRAME_DATA */
+                HANDLE_FDK_BITSTREAM   hBs,          /*!< handle to struct BIT_BUF */
+                const UINT             flags)
+{
+  int i, j;
+  UCHAR no_band[MAX_ENVELOPES];
+  int delta = 0;
+  int offset = 0;
+  COUPLING_MODE coupling = h_frame_data->coupling;
+  int ampRes = hHeaderData->bs_info.ampResolution;
+  int nEnvelopes = h_frame_data->frameInfo.nEnvelopes;
+  int envDataTableCompFactor;
+  int start_bits, start_bits_balance;
+  Huffman hcb_t, hcb_f;
+
+  h_frame_data->nScaleFactors = 0;
+
+  if ( (h_frame_data->frameInfo.frameClass == 0) && (nEnvelopes == 1) ) {
+    if (flags & SBRDEC_ELD_GRID)
+      ampRes = h_frame_data->ampResolutionCurrentFrame;
+    else
+      ampRes = 0;
+  }
+  h_frame_data->ampResolutionCurrentFrame = ampRes;
+
+  /*
+    Set number of bits for first value depending on amplitude resolution
+  */
+  if(ampRes == 1)
+  {
+    start_bits = 6;
+    start_bits_balance = 5;
+  }
+  else
+  {
+    start_bits = 7;
+    start_bits_balance = 6;
+  }
+
+  /*
+    Calculate number of values for each envelope and alltogether
+  */
+  for (i = 0; i < nEnvelopes; i++) {
+    no_band[i] = hHeaderData->freqBandData.nSfb[h_frame_data->frameInfo.freqRes[i]];
+    h_frame_data->nScaleFactors += no_band[i];
+  }
+  if (h_frame_data->nScaleFactors > MAX_NUM_ENVELOPE_VALUES)
+    return 0;
+
+  /*
+    Select Huffman codebook depending on coupling mode and amplitude resolution
+  */
+  if (coupling == COUPLING_BAL) {
+    envDataTableCompFactor = 1;
+    if (ampRes == 0) {
+      hcb_t = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvBalance10T;
+      hcb_f = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvBalance10F;
+    }
+    else {
+      hcb_t = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvBalance11T;
+      hcb_f = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvBalance11F;
+    }
+  }
+  else {
+    envDataTableCompFactor = 0;
+    if (ampRes == 0) {
+      hcb_t = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvLevel10T;
+      hcb_f = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvLevel10F;
+    }
+    else {
+      hcb_t = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvLevel11T;
+      hcb_f = (Huffman)&FDK_sbrDecoder_sbr_huffBook_EnvLevel11F;
+    }
+  }
+
+  /*
+    Now read raw envelope data
+  */
+  for (j = 0, offset = 0; j < nEnvelopes; j++) {
+
+
+    if (h_frame_data->domain_vec[j] == 0) {
+      if (coupling == COUPLING_BAL) {
+        h_frame_data->iEnvelope[offset] =
+          (FIXP_SGL) (( (int)FDKreadBits(hBs, start_bits_balance)) << envDataTableCompFactor);
+      }
+      else {
+        h_frame_data->iEnvelope[offset] =
+          (FIXP_SGL) (int)FDKreadBits (hBs, start_bits);
+      }
+    }
+
+    for (i = (1 - h_frame_data->domain_vec[j]); i < no_band[j]; i++) {
+
+      if (h_frame_data->domain_vec[j] == 0) {
+        delta = DecodeHuffmanCW(hcb_f, hBs);
+      }
+      else {
+        delta = DecodeHuffmanCW(hcb_t, hBs);
+      }
+
+      h_frame_data->iEnvelope[offset + i] = (FIXP_SGL) (delta << envDataTableCompFactor);
+    }
+    offset += no_band[j];
+  }
+
+#if ENV_EXP_FRACT
+  /* Convert from int to scaled fract (ENV_EXP_FRACT bits for the fractional part) */
+  for (i = 0; i < h_frame_data->nScaleFactors; i++) {
+    h_frame_data->iEnvelope[i] <<= ENV_EXP_FRACT;
+  }
+#endif
+
+  return 1;
+}
+
+
+//static const FRAME_INFO v_frame_info1_8 = { 0, 1, {0, 8}, {1}, -1, 1, {0, 8} };
+static const FRAME_INFO v_frame_info2_8 = { 0, 2, {0, 4, 8}, {1, 1}, -1, 2, {0, 4, 8} };
+static const FRAME_INFO v_frame_info4_8 = { 0, 4, {0, 2, 4, 6, 8}, {1, 1, 1, 1}, -1, 2, {0, 4, 8} };
+
+/***************************************************************************/
+/*!
+  \brief    Generates frame info for FIXFIXonly frame class used for low delay version
+
+  \return   nothing
+ ****************************************************************************/
+ static void generateFixFixOnly ( FRAME_INFO *hSbrFrameInfo,
+                                  int tranPosInternal,
+                                  int numberTimeSlots
+                                )
+{
+    int nEnv, i, tranIdx;
+    const int *pTable;
+
+    switch (numberTimeSlots) {
+        case 8:
+            pTable = FDK_sbrDecoder_envelopeTable_8[tranPosInternal];
+            break;
+        case 15:
+            pTable = FDK_sbrDecoder_envelopeTable_15[tranPosInternal];
+            break;
+        case 16:
+            pTable = FDK_sbrDecoder_envelopeTable_16[tranPosInternal];
+            break;
+        default:
+            FDK_ASSERT(0);
+    }
+
+    /* look number of envelopes in table */
+    nEnv = pTable[0];
+    /* look up envelope distribution in table */
+    for (i=1; i<nEnv; i++)
+        hSbrFrameInfo->borders[i] = pTable[i+2];
+    /* open and close frame border */
+    hSbrFrameInfo->borders[0]    = 0;
+    hSbrFrameInfo->borders[nEnv] = numberTimeSlots;
+    hSbrFrameInfo->nEnvelopes = nEnv;
+
+   /* transient idx */
+    tranIdx = hSbrFrameInfo->tranEnv = pTable[1];
+
+    /* add noise floors */
+    hSbrFrameInfo->bordersNoise[0] = 0;
+    hSbrFrameInfo->bordersNoise[1] = hSbrFrameInfo->borders[tranIdx?tranIdx:1];
+    hSbrFrameInfo->bordersNoise[2] = numberTimeSlots;
+    /* nEnv is always > 1, so nNoiseEnvelopes is always 2 (IEC 14496-3 4.6.19.3.2) */
+    hSbrFrameInfo->nNoiseEnvelopes = 2;
+}
+
+/*!
+  \brief  Extracts LowDelaySBR control data from the bitstream.
+
+  \return zero for bitstream error, one for correct.
+*/
+static int
+extractLowDelayGrid (HANDLE_FDK_BITSTREAM hBitBuf,          /*!< bitbuffer handle */
+                     HANDLE_SBR_HEADER_DATA hHeaderData,
+                     HANDLE_SBR_FRAME_DATA h_frame_data, /*!< contains the FRAME_INFO struct to be filled */
+                     int timeSlots
+                    )
+{
+  FRAME_INFO * pFrameInfo = &h_frame_data->frameInfo;
+  INT numberTimeSlots = hHeaderData->numberTimeSlots;
+  INT temp = 0, k;
+
+      /* FIXFIXonly framing case */
+      h_frame_data->frameInfo.frameClass = 0;
+
+      /* get the transient position from the bitstream */
+      switch (timeSlots){
+        case 8:
+          /* 3bit transient position (temp={0;..;7}) */
+          temp = FDKreadBits( hBitBuf, 3);
+          break;
+
+        case 16:
+        case 15:
+          /* 4bit transient position (temp={0;..;15}) */
+          temp = FDKreadBits( hBitBuf, 4);
+          break;
+
+        default:
+          return 0;
+      }
+
+      /* calculate borders according to the transient position */
+      generateFixFixOnly ( pFrameInfo,
+                           temp,
+                           numberTimeSlots
+                         );
+
+      /* decode freq res: */
+      for (k = 0; k < pFrameInfo->nEnvelopes; k++) {
+          pFrameInfo->freqRes[k] = (UCHAR) FDKreadBits (hBitBuf, 1); /* f = F [1 bits] */          
+      }
+
+
+  return 1;
+}
+
+/*!
+  \brief   Extract the frame information (structure FRAME_INFO) from the bitstream
+  \return  Zero for bitstream error, one for correct.
+*/
+int
+extractFrameInfo ( HANDLE_FDK_BITSTREAM   hBs,          /*!< bitbuffer handle */
+                   HANDLE_SBR_HEADER_DATA hHeaderData,  /*!< Static control data */
+                   HANDLE_SBR_FRAME_DATA  h_frame_data, /*!< pointer to memory where the frame-info will be stored */
+                   const UINT             nrOfChannels,
+                   const UINT             flags
+                 )
+{
+  FRAME_INFO * pFrameInfo = &h_frame_data->frameInfo;
+  int numberTimeSlots = hHeaderData->numberTimeSlots;
+  int pointer_bits = 0, nEnv = 0, b = 0, border, i, n = 0,
+    k, p, aL, aR, nL, nR,
+    temp = 0, staticFreqRes;
+  UCHAR frameClass;
+
+  if (flags & SBRDEC_ELD_GRID) {
+      /* CODEC_AACLD (LD+SBR) only uses the normal 0 Grid for non-transient Frames and the LowDelayGrid for transient Frames */
+      frameClass = FDKreadBits (hBs, 1); /* frameClass = [1 bit] */
+      if ( frameClass == 1 ) {
+        /* if frameClass == 1, extract LowDelaySbrGrid, otherwise extract normal SBR-Grid for FIXIFX */
+        /* extract the AACLD-Sbr-Grid */
+        pFrameInfo->frameClass = frameClass;
+        extractLowDelayGrid (hBs, hHeaderData, h_frame_data, numberTimeSlots);
+        return 1;
+      }
+  } else
+  {
+    frameClass = FDKreadBits (hBs, 2); /* frameClass = C [2 bits] */
+  }
+
+
+  switch (frameClass) {
+  case 0:
+    temp = FDKreadBits (hBs, 2);     /* E [2 bits ] */
+    nEnv = (int) (1 << temp);    /* E -> e */
+
+    if ((flags & SBRDEC_ELD_GRID) && (nEnv == 1))
+      h_frame_data->ampResolutionCurrentFrame = FDKreadBits( hBs, 1); /* new ELD Syntax 07-11-09 */
+
+    staticFreqRes = FDKreadBits (hBs, 1);
+
+    {
+      if (nEnv > MAX_ENVELOPES_HEAAC)
+        return 0;
+    }
+
+    b = nEnv + 1;
+    switch (nEnv) {
+    case 1:
+      switch (numberTimeSlots) {
+        case 15:
+          FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info1_15, sizeof(FRAME_INFO));
+          break;
+        case 16:
+          FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info1_16, sizeof(FRAME_INFO));
+          break;
+        default:
+          FDK_ASSERT(0);
+      }
+      break;
+    case 2:
+      switch (numberTimeSlots) {
+        case 15:
+          FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info2_15, sizeof(FRAME_INFO));
+          break;
+        case 16:
+          FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info2_16, sizeof(FRAME_INFO));
+          break;
+        default:
+          FDK_ASSERT(0);
+      }
+      break;
+    case 4:
+      switch (numberTimeSlots) {
+        case 15:
+          FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info4_15, sizeof(FRAME_INFO));
+          break;
+        case 16:
+          FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info4_16, sizeof(FRAME_INFO));
+          break;
+        default:
+          FDK_ASSERT(0);
+      }
+      break;
+    case 8:
+#if (MAX_ENVELOPES >= 8)
+      switch (numberTimeSlots) {
+        case 15:
+          FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info8_15, sizeof(FRAME_INFO));
+          break;
+        case 16:
+          FDKmemcpy (pFrameInfo, &FDK_sbrDecoder_sbr_frame_info8_16, sizeof(FRAME_INFO));
+          break;
+        default:
+          FDK_ASSERT(0);
+      }
+      break;
+#else
+      return 0;
+#endif
+    }
+    /* Apply correct freqRes (High is default) */
+    if (!staticFreqRes) {
+      for (i = 0; i < nEnv ; i++)
+        pFrameInfo->freqRes[i] = 0;
+    }
+
+    break;
+  case 1:
+  case 2:
+    temp = FDKreadBits (hBs, 2);  /* A [2 bits] */
+
+    n    = FDKreadBits (hBs, 2);  /* n = N [2 bits] */
+
+    nEnv = n + 1;                             /* # envelopes */
+    b = nEnv + 1;                             /* # borders   */
+
+    break;
+  }
+
+  switch (frameClass) {
+  case 1:
+    /* Decode borders: */
+    pFrameInfo->borders[0] = 0;               /* first border          */
+    border = temp + numberTimeSlots;          /* A -> aR               */
+    i = b-1;                                  /* frame info index for last border */
+    pFrameInfo->borders[i] = border;          /* last border                      */
+
+    for (k = 0; k < n; k++) {
+      temp = FDKreadBits (hBs, 2);/* R [2 bits] */
+      border -= (2 * temp + 2);               /* R -> r                */
+      pFrameInfo->borders[--i] = border;
+    }
+
+
+    /* Decode pointer: */
+    pointer_bits = DFRACT_BITS - 1 - CountLeadingBits((FIXP_DBL)(n+1));
+    p = FDKreadBits (hBs, pointer_bits);     /* p = P [pointer_bits bits] */
+
+    if (p > n+1)
+      return 0;
+
+    pFrameInfo->tranEnv = p ? n + 2 - p : -1;
+
+
+    /* Decode freq res: */
+    for (k = n; k >= 0; k--) {
+      pFrameInfo->freqRes[k] = FDKreadBits (hBs, 1); /* f = F [1 bits] */
+    }
+
+
+    /* Calculate noise floor middle border: */
+    if (p == 0 || p == 1)
+      pFrameInfo->bordersNoise[1] = pFrameInfo->borders[n];
+    else
+      pFrameInfo->bordersNoise[1] = pFrameInfo->borders[pFrameInfo->tranEnv];
+
+    break;
+
+  case 2:
+    /* Decode borders: */
+    border = temp;                            /* A -> aL */
+    pFrameInfo->borders[0] = border;          /* first border */
+
+    for (k = 1; k <= n; k++) {
+      temp = FDKreadBits (hBs, 2);/* R [2 bits] */
+      border += (2 * temp + 2);               /* R -> r                */
+      pFrameInfo->borders[k] = border;
+    }
+    pFrameInfo->borders[k] = numberTimeSlots; /* last border */
+
+
+    /* Decode pointer: */
+    pointer_bits = DFRACT_BITS - 1 - CountLeadingBits((FIXP_DBL)(n+1));
+    p = FDKreadBits (hBs, pointer_bits);     /* p = P [pointer_bits bits] */
+    if (p > n+1)
+      return 0;
+
+    if (p == 0 || p == 1)
+      pFrameInfo->tranEnv = -1;
+    else
+      pFrameInfo->tranEnv = p - 1;
+
+
+
+    /* Decode freq res: */
+    for (k = 0; k <= n; k++) {
+      pFrameInfo->freqRes[k] = FDKreadBits(hBs, 1); /* f = F [1 bits] */
+    }
+
+
+
+    /* Calculate noise floor middle border: */
+    switch (p) {
+    case 0:
+      pFrameInfo->bordersNoise[1] = pFrameInfo->borders[1];
+      break;
+    case 1:
+      pFrameInfo->bordersNoise[1] = pFrameInfo->borders[n];
+      break;
+    default:
+      pFrameInfo->bordersNoise[1] = pFrameInfo->borders[pFrameInfo->tranEnv];
+      break;
+    }
+
+    break;
+
+  case 3:
+    /* v_ctrlSignal = [frameClass,aL,aR,nL,nR,v_rL,v_rR,p,v_fLR]; */
+
+    aL = FDKreadBits (hBs, 2);       /* AL [2 bits], AL -> aL */
+
+    aR = FDKreadBits (hBs, 2) + numberTimeSlots;     /* AR [2 bits], AR -> aR */
+
+    nL = FDKreadBits (hBs, 2);       /* nL = NL [2 bits] */
+
+    nR = FDKreadBits (hBs, 2);       /* nR = NR [2 bits] */
+
+
+
+    /*-------------------------------------------------------------------------
+      Calculate help variables
+      --------------------------------------------------------------------------*/
+
+    /* general: */
+    nEnv = nL + nR + 1;            /* # envelopes */
+    if (nEnv > MAX_ENVELOPES)
+      return 0;
+    b = nEnv + 1;                  /* # borders   */
+
+
+
+    /*-------------------------------------------------------------------------
+      Decode envelopes
+      --------------------------------------------------------------------------*/
+
+
+    /* L-borders:   */
+    border            = aL;                   /* first border */
+    pFrameInfo->borders[0] = border;
+
+    for (k = 1; k <= nL; k++) {
+      temp = FDKreadBits (hBs, 2);/* R [2 bits] */
+      border += (2 * temp + 2);               /* R -> r                */
+      pFrameInfo->borders[k] = border;
+    }
+
+
+    /* R-borders:  */
+    border = aR;                              /* last border */
+    i      = nEnv;
+
+    pFrameInfo->borders[i] = border;
+
+    for (k = 0; k < nR; k++) {
+      temp = FDKreadBits (hBs, 2);/* R [2 bits] */
+      border -= (2 * temp + 2);               /* R -> r                */
+      pFrameInfo->borders[--i] = border;
+    }
+
+
+    /* decode pointer: */
+    pointer_bits = DFRACT_BITS - 1 - CountLeadingBits((FIXP_DBL)(nL+nR+1));
+    p = FDKreadBits (hBs, pointer_bits);     /* p = P [pointer_bits bits] */
+
+    if (p > nL+nR+1)
+      return 0;
+
+    pFrameInfo->tranEnv = p ? b - p : -1;
+
+
+
+    /* decode freq res: */
+    for (k = 0; k < nEnv; k++) {
+      pFrameInfo->freqRes[k] = FDKreadBits(hBs, 1); /* f = F [1 bits] */
+    }
+
+
+
+    /*-------------------------------------------------------------------------
+      Decode noise floors
+      --------------------------------------------------------------------------*/
+    pFrameInfo->bordersNoise[0] = aL;
+
+    if (nEnv == 1) {
+      /* 1 noise floor envelope: */
+      pFrameInfo->bordersNoise[1] = aR;
+    }
+    else {
+      /* 2 noise floor envelopes */
+      if (p == 0 || p == 1)
+        pFrameInfo->bordersNoise[1] = pFrameInfo->borders[nEnv - 1];
+      else
+        pFrameInfo->bordersNoise[1] = pFrameInfo->borders[pFrameInfo->tranEnv];
+      pFrameInfo->bordersNoise[2] = aR;
+    }
+    break;
+  }
+
+
+  /*
+    Store number of envelopes, noise floor envelopes and frame class
+  */
+  pFrameInfo->nEnvelopes = nEnv;
+
+  if (nEnv == 1)
+    pFrameInfo->nNoiseEnvelopes = 1;
+  else
+    pFrameInfo->nNoiseEnvelopes = 2;
+
+  pFrameInfo->frameClass = frameClass;
+
+  if (pFrameInfo->frameClass == 2 || pFrameInfo->frameClass == 1) {
+    /* calculate noise floor first and last borders: */
+    pFrameInfo->bordersNoise[0] = pFrameInfo->borders[0];
+    pFrameInfo->bordersNoise[pFrameInfo->nNoiseEnvelopes] = pFrameInfo->borders[nEnv];
+  }
+
+
+  return 1;
+}
+
+
+/*!
+  \brief   Check if the frameInfo vector has reasonable values.
+  \return  Zero for error, one for correct
+*/
+static int
+checkFrameInfo (FRAME_INFO * pFrameInfo, /*!< pointer to frameInfo */
+                int numberOfTimeSlots,   /*!< QMF time slots per frame */
+                int overlap,             /*!< Amount of overlap QMF time slots */
+                int timeStep)            /*!< QMF slots to SBR slots step factor */
+{
+  int maxPos,i,j;
+  int startPos;
+  int stopPos;
+  int tranEnv;
+  int startPosNoise;
+  int stopPosNoise;
+  int nEnvelopes = pFrameInfo->nEnvelopes;
+  int nNoiseEnvelopes = pFrameInfo->nNoiseEnvelopes;
+
+  if(nEnvelopes < 1 || nEnvelopes > MAX_ENVELOPES)
+    return 0;
+
+  if(nNoiseEnvelopes > MAX_NOISE_ENVELOPES)
+    return 0;
+
+  startPos        = pFrameInfo->borders[0];
+  stopPos         = pFrameInfo->borders[nEnvelopes];
+  tranEnv         = pFrameInfo->tranEnv;
+  startPosNoise   = pFrameInfo->bordersNoise[0];
+  stopPosNoise    = pFrameInfo->bordersNoise[nNoiseEnvelopes];
+
+  if (overlap < 0 || overlap > (6)) {
+    return 0;
+  }
+  if (timeStep < 1 || timeStep > 2) {
+    return 0;
+  }
+  maxPos = numberOfTimeSlots + (overlap/timeStep);
+
+  /* Check that the start and stop positions of the frame are reasonable values. */
+  if( (startPos < 0) || (startPos >= stopPos) )
+    return 0;
+  if( startPos > maxPos-numberOfTimeSlots ) /* First env. must start in or directly after the overlap buffer */
+    return 0;
+  if( stopPos < numberOfTimeSlots ) /* One complete frame must be ready for output after processing */
+    return 0;
+  if(stopPos > maxPos)
+    return 0;
+
+  /* Check that the  start border for every envelope is strictly later in time */
+  for(i=0;i<nEnvelopes;i++) {
+    if(pFrameInfo->borders[i] >= pFrameInfo->borders[i+1])
+      return 0;
+  }
+
+  /* Check that the envelope to be shortened is actually among the envelopes */
+  if(tranEnv>nEnvelopes)
+    return 0;
+
+
+  /* Check the noise borders */
+  if(nEnvelopes==1 && nNoiseEnvelopes>1)
+    return 0;
+
+  if(startPos != startPosNoise || stopPos != stopPosNoise)
+    return 0;
+
+
+  /* Check that the  start border for every noise-envelope is strictly later in time*/
+  for(i=0; i<nNoiseEnvelopes; i++) {
+    if(pFrameInfo->bordersNoise[i] >= pFrameInfo->bordersNoise[i+1])
+      return 0;
+  }
+
+  /* Check that every noise border is the same as an envelope border*/
+  for(i=0; i<nNoiseEnvelopes; i++) {
+    startPosNoise = pFrameInfo->bordersNoise[i];
+
+    for(j=0; j<nEnvelopes; j++) {
+      if(pFrameInfo->borders[j] == startPosNoise)
+        break;
+    }
+    if(j==nEnvelopes)
+      return 0;
+  }
+
+  return 1;
+}