AAC_DECODER_ERROR CChannelElement_Read(HANDLE_FDK_BITSTREAM hBs,
                                       CAacDecoderChannelInfo *pAacDecoderChannelInfo[],
                                       CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[],
                                       const AUDIO_OBJECT_TYPE aot,
                                       const SamplingRateInfo *pSamplingRateInfo,
                                       const UINT  flags,
                                       const UINT  frame_length,
                                       const UCHAR numberOfChannels,
                                       const SCHAR epConfig,
                                       HANDLE_TRANSPORTDEC pTpDec
                                       )
{
  AAC_DECODER_ERROR error = AAC_DEC_OK;
  const element_list_t *list;
  int i, ch, decision_bit;
  int crcReg1 = -1, crcReg2 = -1;

  FDK_ASSERT( (numberOfChannels == 1) || (numberOfChannels == 2) );

  /* Get channel element sequence table */
  list = getBitstreamElementList(aot, epConfig, numberOfChannels, 0);
  if (list == NULL) {
    error = AAC_DEC_UNSUPPORTED_FORMAT;
    goto bail;
  }

  CTns_Reset(&pAacDecoderChannelInfo[0]->pDynData->TnsData);
  if (numberOfChannels == 2) {
    CTns_Reset(&pAacDecoderChannelInfo[1]->pDynData->TnsData);
  }

  if (flags & (AC_ELD|AC_SCALABLE)) {
    pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow = 1;
    if (numberOfChannels == 2) {
      pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow = pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow;
    }
    if (numberOfChannels == 2) {
      pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow = pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow;
    }
  }

  /* Iterate through sequence table */
  i = 0;
  ch = 0;
  decision_bit = 0;
  do {
    switch (list->id[i]) {
    case element_instance_tag:
      pAacDecoderChannelInfo[0]->ElementInstanceTag = FDKreadBits(hBs, 4);
      if (numberOfChannels == 2) {
        pAacDecoderChannelInfo[1]->ElementInstanceTag = pAacDecoderChannelInfo[0]->ElementInstanceTag;
      }
      break;
    case common_window:
      decision_bit = pAacDecoderChannelInfo[ch]->pDynData->RawDataInfo.CommonWindow = FDKreadBits(hBs, 1);
      if (numberOfChannels == 2) {
        pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow = pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow;
      }
      break;
    case ics_info:
      /* Read individual channel info */
      error = IcsRead( hBs,
                      &pAacDecoderChannelInfo[ch]->icsInfo,
                       pSamplingRateInfo,
                       flags );

      if (numberOfChannels == 2 && pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow) {
        pAacDecoderChannelInfo[1]->icsInfo = pAacDecoderChannelInfo[0]->icsInfo;
      }
      break;


    case ltp_data_present:
      if (FDKreadBits(hBs, 1) != 0) {
        error = AAC_DEC_UNSUPPORTED_PREDICTION;
      }
      break;

    case ms:
      if ( CJointStereo_Read(
              hBs,
             &pAacDecoderChannelInfo[0]->pComData->jointStereoData, 
              GetWindowGroups(&pAacDecoderChannelInfo[0]->icsInfo),
              GetScaleMaxFactorBandsTransmitted(&pAacDecoderChannelInfo[0]->icsInfo,
                                                &pAacDecoderChannelInfo[1]->icsInfo),
              flags) )
      {
        error = AAC_DEC_PARSE_ERROR;
      }
      break;

    case global_gain:
      pAacDecoderChannelInfo[ch]->pDynData->RawDataInfo.GlobalGain = (UCHAR) FDKreadBits(hBs,8);
      break;

    case section_data:
      error = CBlock_ReadSectionData( hBs,
                                      pAacDecoderChannelInfo[ch],
                                      pSamplingRateInfo,
                                      flags );
      break;


    case scale_factor_data:
      if (flags & AC_ER_RVLC) {
        /* read RVLC data from bitstream (error sens. cat. 1) */ 
        CRvlc_Read(pAacDecoderChannelInfo[ch], hBs);
      }
      else
      {
        error = CBlock_ReadScaleFactorData(pAacDecoderChannelInfo[ch], hBs, flags);
      }
      break;

    case pulse:
      if ( CPulseData_Read( hBs,
                           &pAacDecoderChannelInfo[ch]->pDynData->specificTo.aac.PulseData,
                            pSamplingRateInfo->ScaleFactorBands_Long, /* pulse data is only allowed to be present in long blocks! */
                            (void*)&pAacDecoderChannelInfo[ch]->icsInfo,
                            frame_length
                          ) != 0 )
      {
        error = AAC_DEC_DECODE_FRAME_ERROR;
      }
      break;
    case tns_data_present:
      CTns_ReadDataPresentFlag(hBs, &pAacDecoderChannelInfo[ch]->pDynData->TnsData);
      break;
    case tns_data:
      /* tns_data_present is checked inside CTns_Read(). */
      error = CTns_Read(hBs, &pAacDecoderChannelInfo[ch]->pDynData->TnsData, &pAacDecoderChannelInfo[ch]->icsInfo, flags);
      break;

    case gain_control_data:
      break;
    
    case gain_control_data_present:
      if (FDKreadBits(hBs, 1)) {
        error = AAC_DEC_UNSUPPORTED_GAIN_CONTROL_DATA;
      }
      break;

    case esc2_rvlc:
      if (flags & AC_ER_RVLC) {
        CRvlc_Decode(
                pAacDecoderChannelInfo[ch],
                pAacDecoderStaticChannelInfo[ch],
                hBs
                );
      }
      break;

    case esc1_hcr:
      if (flags & AC_ER_HCR) {
        CHcr_Read(hBs, pAacDecoderChannelInfo[ch] );
      }
      break;

    case spectral_data:
      error = CBlock_ReadSpectralData( hBs,
                                       pAacDecoderChannelInfo[ch],
                                       pSamplingRateInfo,
                                       flags );
      if (flags & AC_ELD) {
        pAacDecoderChannelInfo[ch]->renderMode = AACDEC_RENDER_ELDFB;
      } else {
        pAacDecoderChannelInfo[ch]->renderMode = AACDEC_RENDER_IMDCT;
      }
      break;


      /* CRC handling */
    case adtscrc_start_reg1:
      if (pTpDec != NULL) {
        crcReg1 = transportDec_CrcStartReg(pTpDec, 192);
      }
      break;
    case adtscrc_start_reg2:
      if (pTpDec != NULL) {
        crcReg2 = transportDec_CrcStartReg(pTpDec, 128);
      }
      break;
    case adtscrc_end_reg1:
    case drmcrc_end_reg:
      if (pTpDec != NULL) {
        transportDec_CrcEndReg(pTpDec, crcReg1);
      }
      break;
    case adtscrc_end_reg2:
      if (pTpDec != NULL) {
        transportDec_CrcEndReg(pTpDec, crcReg2);
      }
      break;
    case drmcrc_start_reg:
      if (pTpDec != NULL) {
        crcReg1 = transportDec_CrcStartReg(pTpDec, 0);
      }
      break;

      /* Non data cases */
    case next_channel:
      ch = (ch + 1) % numberOfChannels;
      break;
    case link_sequence:
      list = list->next[decision_bit];
      i=-1;
      break;

    default:
      error = AAC_DEC_UNSUPPORTED_FORMAT;
      break;
    }

    if (error != AAC_DEC_OK) {
      goto bail;
    }

    i++;

  } while (list->id[i] != end_of_sequence);

bail:
  return error;
}
Beispiel #2
0
/*
 * Arbitrary order bitstream parser
 */
AAC_DECODER_ERROR CChannelElement_Read(
    HANDLE_FDK_BITSTREAM hBs, CAacDecoderChannelInfo *pAacDecoderChannelInfo[],
    CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[],
    const AUDIO_OBJECT_TYPE aot, SamplingRateInfo *pSamplingRateInfo,
    const UINT flags, const UINT elFlags, const UINT frame_length,
    const UCHAR numberOfChannels, const SCHAR epConfig,
    HANDLE_TRANSPORTDEC pTpDec) {
  AAC_DECODER_ERROR error = AAC_DEC_OK;
  const element_list_t *list;
  int i, ch, decision_bit;
  int crcReg1 = -1, crcReg2 = -1;
  int cplxPred;
  int ind_sw_cce_flag = 0, num_gain_element_lists = 0;

  FDK_ASSERT((numberOfChannels == 1) || (numberOfChannels == 2));

  /* Get channel element sequence table */
  list = getBitstreamElementList(aot, epConfig, numberOfChannels, 0, elFlags);
  if (list == NULL) {
    error = AAC_DEC_UNSUPPORTED_FORMAT;
    goto bail;
  }

  CTns_Reset(&pAacDecoderChannelInfo[0]->pDynData->TnsData);
  /* Set common window to 0 by default. If signalized in the bit stream it will
   * be overwritten later explicitely */
  pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow = 0;
  if (flags & (AC_USAC | AC_RSVD50 | AC_RSV603DA)) {
    pAacDecoderChannelInfo[0]->pDynData->specificTo.usac.tns_active = 0;
    pAacDecoderChannelInfo[0]->pDynData->specificTo.usac.tns_on_lr = 0;
  }
  if (numberOfChannels == 2) {
    CTns_Reset(&pAacDecoderChannelInfo[1]->pDynData->TnsData);
    pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow = 0;
  }

  cplxPred = 0;
  if (pAacDecoderStaticChannelInfo != NULL) {
    if (elFlags & AC_EL_USAC_CP_POSSIBLE) {
      pAacDecoderChannelInfo[0]->pComData->jointStereoData.cplx_pred_flag = 0;
      cplxPred = 1;
    }
  }

  if (0 || (flags & (AC_ELD | AC_SCALABLE))) {
    pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow = 1;
    if (numberOfChannels == 2) {
      pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow =
          pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow;
    }
  }

  /* Iterate through sequence table */
  i = 0;
  ch = 0;
  decision_bit = 0;
  do {
    switch (list->id[i]) {
      case element_instance_tag:
        pAacDecoderChannelInfo[0]->ElementInstanceTag = FDKreadBits(hBs, 4);
        if (numberOfChannels == 2) {
          pAacDecoderChannelInfo[1]->ElementInstanceTag =
              pAacDecoderChannelInfo[0]->ElementInstanceTag;
        }
        break;
      case common_window:
        decision_bit =
            pAacDecoderChannelInfo[ch]->pDynData->RawDataInfo.CommonWindow =
                FDKreadBits(hBs, 1);
        if (numberOfChannels == 2) {
          pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow =
              pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow;
        }
        break;
      case ics_info:
        /* store last window sequence (utilized in complex stereo prediction)
         * before reading new channel-info */
        if (cplxPred) {
          if (pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow) {
            pAacDecoderStaticChannelInfo[0]
                ->pCpeStaticData->jointStereoPersistentData.winSeqPrev =
                pAacDecoderChannelInfo[0]->icsInfo.WindowSequence;
            pAacDecoderStaticChannelInfo[0]
                ->pCpeStaticData->jointStereoPersistentData.winShapePrev =
                pAacDecoderChannelInfo[0]->icsInfo.WindowShape;
          }
        }
        /* Read individual channel info */
        error = IcsRead(hBs, &pAacDecoderChannelInfo[ch]->icsInfo,
                        pSamplingRateInfo, flags);

        if (elFlags & AC_EL_LFE &&
            GetWindowSequence(&pAacDecoderChannelInfo[ch]->icsInfo) !=
                BLOCK_LONG) {
          error = AAC_DEC_PARSE_ERROR;
          break;
        }

        if (numberOfChannels == 2 &&
            pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow) {
          pAacDecoderChannelInfo[1]->icsInfo =
              pAacDecoderChannelInfo[0]->icsInfo;
        }
        break;

      case common_max_sfb:
        if (FDKreadBit(hBs) == 0) {
          error = IcsReadMaxSfb(hBs, &pAacDecoderChannelInfo[1]->icsInfo,
                                pSamplingRateInfo);
        }
        break;

      case ltp_data_present:
        if (FDKreadBits(hBs, 1) != 0) {
          error = AAC_DEC_UNSUPPORTED_PREDICTION;
        }
        break;

      case ms:

        INT max_sfb_ste;
        INT max_sfb_ste_clear;

        max_sfb_ste = GetScaleMaxFactorBandsTransmitted(
            &pAacDecoderChannelInfo[0]->icsInfo,
            &pAacDecoderChannelInfo[1]->icsInfo);

        max_sfb_ste_clear = 64;

        pAacDecoderChannelInfo[0]->icsInfo.max_sfb_ste = (UCHAR)max_sfb_ste;
        pAacDecoderChannelInfo[1]->icsInfo.max_sfb_ste = (UCHAR)max_sfb_ste;

        if (flags & (AC_USAC | AC_RSV603DA) &&
            pAacDecoderChannelInfo[ch]->pDynData->RawDataInfo.CommonWindow ==
                0) {
          Clean_Complex_Prediction_coefficients(
              &pAacDecoderStaticChannelInfo[0]
                   ->pCpeStaticData->jointStereoPersistentData,
              GetWindowGroups(&pAacDecoderChannelInfo[0]->icsInfo), 0, 64);
        }

        if (CJointStereo_Read(
                hBs, &pAacDecoderChannelInfo[0]->pComData->jointStereoData,
                GetWindowGroups(&pAacDecoderChannelInfo[0]->icsInfo),
                max_sfb_ste, max_sfb_ste_clear,
                /* jointStereoPersistentData and cplxPredictionData are only
                   available/allocated if cplxPred is active. */
                ((cplxPred == 0) || (pAacDecoderStaticChannelInfo == NULL))
                    ? NULL
                    : &pAacDecoderStaticChannelInfo[0]
                           ->pCpeStaticData->jointStereoPersistentData,
                ((cplxPred == 0) || (pAacDecoderChannelInfo[0] == NULL))
                    ? NULL
                    : pAacDecoderChannelInfo[0]
                          ->pComStaticData->cplxPredictionData,
                cplxPred,
                GetScaleFactorBandsTotal(&pAacDecoderChannelInfo[0]->icsInfo),
                GetWindowSequence(&pAacDecoderChannelInfo[0]->icsInfo),
                flags)) {
          error = AAC_DEC_PARSE_ERROR;
        }

        break;

      case global_gain:
        pAacDecoderChannelInfo[ch]->pDynData->RawDataInfo.GlobalGain =
            (UCHAR)FDKreadBits(hBs, 8);
        break;

      case section_data:
        error = CBlock_ReadSectionData(hBs, pAacDecoderChannelInfo[ch],
                                       pSamplingRateInfo, flags);
        break;

      case scale_factor_data_usac:
        pAacDecoderChannelInfo[ch]->currAliasingSymmetry = 0;
        /* Set active sfb codebook indexes to HCB_ESC to make them "active" */
        CChannel_CodebookTableInit(
            pAacDecoderChannelInfo[ch]); /*  equals ReadSectionData(self,
                                            bs) in float soft. block.c
                                            line: ~599 */
        /* Note: The missing "break" is intentional here, since we need to call
         * CBlock_ReadScaleFactorData(). */

      case scale_factor_data:
        if (flags & AC_ER_RVLC) {
          /* read RVLC data from bitstream (error sens. cat. 1) */
          CRvlc_Read(pAacDecoderChannelInfo[ch], hBs);
        } else {
          error = CBlock_ReadScaleFactorData(pAacDecoderChannelInfo[ch], hBs,
                                             flags);
        }
        break;

      case pulse:
        if (CPulseData_Read(
                hBs,
                &pAacDecoderChannelInfo[ch]->pDynData->specificTo.aac.PulseData,
                pSamplingRateInfo->ScaleFactorBands_Long, /* pulse data is only
                                                             allowed to be
                                                             present in long
                                                             blocks! */
                (void *)&pAacDecoderChannelInfo[ch]->icsInfo,
                frame_length) != 0) {
          error = AAC_DEC_DECODE_FRAME_ERROR;
        }
        break;
      case tns_data_present:
        CTns_ReadDataPresentFlag(
            hBs, &pAacDecoderChannelInfo[ch]->pDynData->TnsData);
        if (elFlags & AC_EL_LFE &&
            pAacDecoderChannelInfo[ch]->pDynData->TnsData.DataPresent) {
          error = AAC_DEC_PARSE_ERROR;
        }
        break;
      case tns_data:
        /* tns_data_present is checked inside CTns_Read(). */
        error = CTns_Read(hBs, &pAacDecoderChannelInfo[ch]->pDynData->TnsData,
                          &pAacDecoderChannelInfo[ch]->icsInfo, flags);

        break;

      case gain_control_data:
        break;

      case gain_control_data_present:
        if (FDKreadBits(hBs, 1)) {
          error = AAC_DEC_UNSUPPORTED_GAIN_CONTROL_DATA;
        }
        break;

      case tw_data:
        break;
      case common_tw:
        break;
      case tns_data_present_usac:
        if (pAacDecoderChannelInfo[0]->pDynData->specificTo.usac.tns_active) {
          CTns_ReadDataPresentUsac(
              hBs, &pAacDecoderChannelInfo[0]->pDynData->TnsData,
              &pAacDecoderChannelInfo[1]->pDynData->TnsData,
              &pAacDecoderChannelInfo[0]->pDynData->specificTo.usac.tns_on_lr,
              &pAacDecoderChannelInfo[0]->icsInfo, flags, elFlags,
              pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow);
        } else {
          pAacDecoderChannelInfo[0]->pDynData->specificTo.usac.tns_on_lr =
              (UCHAR)1;
        }
        break;
      case core_mode:
        decision_bit = FDKreadBits(hBs, 1);
        pAacDecoderChannelInfo[ch]->data.usac.core_mode = decision_bit;
        if ((ch == 1) && (pAacDecoderChannelInfo[0]->data.usac.core_mode !=
                          pAacDecoderChannelInfo[1]->data.usac.core_mode)) {
          /* StereoCoreToolInfo(core_mode[ch] ) */
          pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow = 0;
          pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow = 0;
        }
        break;
      case tns_active:
        pAacDecoderChannelInfo[0]->pDynData->specificTo.usac.tns_active =
            FDKreadBit(hBs);
        break;
      case noise:
        if (elFlags & AC_EL_USAC_NOISE) {
          pAacDecoderChannelInfo[ch]
              ->pDynData->specificTo.usac.fd_noise_level_and_offset =
              FDKreadBits(hBs, 3 + 5); /* Noise level */
        }
        break;
      case lpd_channel_stream:

      {
        error = CLpdChannelStream_Read(/* = lpd_channel_stream() */
                                       hBs, pAacDecoderChannelInfo[ch],
                                       pAacDecoderStaticChannelInfo[ch],
                                       pSamplingRateInfo, flags);
      }

        pAacDecoderChannelInfo[ch]->renderMode = AACDEC_RENDER_LPD;
        break;
      case fac_data: {
        int fFacDatPresent = FDKreadBit(hBs);

        /* Wee need a valid fac_data[0] even if no FAC data is present (as
         * temporal buffer) */
        pAacDecoderChannelInfo[ch]->data.usac.fac_data[0] =
            pAacDecoderChannelInfo[ch]->data.usac.fac_data0;

        if (fFacDatPresent) {
          if (elFlags & AC_EL_LFE) {
            error = AAC_DEC_PARSE_ERROR;
            break;
          }
          /* FAC data present, this frame is FD, so the last mode had to be
           * ACELP. */
          if (pAacDecoderStaticChannelInfo[ch]->last_core_mode != LPD ||
              pAacDecoderStaticChannelInfo[ch]->last_lpd_mode != 0) {
            pAacDecoderChannelInfo[ch]->data.usac.core_mode_last = LPD;
            pAacDecoderChannelInfo[ch]->data.usac.lpd_mode_last = 0;
            /* We can't change the past! So look to the future and go ahead! */
          }
          CLpd_FAC_Read(hBs, pAacDecoderChannelInfo[ch]->data.usac.fac_data[0],
                        pAacDecoderChannelInfo[ch]->data.usac.fac_data_e,
                        CLpd_FAC_getLength(
                            IsLongBlock(&pAacDecoderChannelInfo[ch]->icsInfo),
                            pAacDecoderChannelInfo[ch]->granuleLength),
                        1, 0);
        } else {
          if (pAacDecoderStaticChannelInfo[ch]->last_core_mode == LPD &&
              pAacDecoderStaticChannelInfo[ch]->last_lpd_mode == 0) {
            /* ACELP to FD transitons without FAC are possible. That is why we
            zero it out (i.e FAC will not be considered in the subsequent
            calculations */
            FDKmemclear(pAacDecoderChannelInfo[ch]->data.usac.fac_data0,
                        LFAC * sizeof(FIXP_DBL));
          }
        }
      } break;
      case esc2_rvlc:
        if (flags & AC_ER_RVLC) {
          CRvlc_Decode(pAacDecoderChannelInfo[ch],
                       pAacDecoderStaticChannelInfo[ch], hBs);
        }
        break;

      case esc1_hcr:
        if (flags & AC_ER_HCR) {
          CHcr_Read(hBs, pAacDecoderChannelInfo[ch],
                    numberOfChannels == 2 ? ID_CPE : ID_SCE);
        }
        break;

      case spectral_data:
        error = CBlock_ReadSpectralData(hBs, pAacDecoderChannelInfo[ch],
                                        pSamplingRateInfo, flags);
        if (flags & AC_ELD) {
          pAacDecoderChannelInfo[ch]->renderMode = AACDEC_RENDER_ELDFB;
        } else {
          if (flags & AC_HDAAC) {
            pAacDecoderChannelInfo[ch]->renderMode = AACDEC_RENDER_INTIMDCT;
          } else {
            pAacDecoderChannelInfo[ch]->renderMode = AACDEC_RENDER_IMDCT;
          }
        }
        break;

      case ac_spectral_data:
        error = CBlock_ReadAcSpectralData(
            hBs, pAacDecoderChannelInfo[ch], pAacDecoderStaticChannelInfo[ch],
            pSamplingRateInfo, frame_length, flags);
        pAacDecoderChannelInfo[ch]->renderMode = AACDEC_RENDER_IMDCT;
        break;

      case coupled_elements: {
        int num_coupled_elements, c;

        ind_sw_cce_flag = FDKreadBit(hBs);
        num_coupled_elements = FDKreadBits(hBs, 3);

        for (c = 0; c < (num_coupled_elements + 1); c++) {
          int cc_target_is_cpe;

          num_gain_element_lists++;
          cc_target_is_cpe = FDKreadBit(hBs); /* cc_target_is_cpe[c] */
          FDKreadBits(hBs, 4);                /* cc_target_tag_select[c] */

          if (cc_target_is_cpe) {
            int cc_l, cc_r;

            cc_l = FDKreadBit(hBs); /* cc_l[c] */
            cc_r = FDKreadBit(hBs); /* cc_r[c] */

            if (cc_l && cc_r) {
              num_gain_element_lists++;
            }
          }
        }
        FDKreadBit(hBs);     /* cc_domain */
        FDKreadBit(hBs);     /* gain_element_sign  */
        FDKreadBits(hBs, 2); /* gain_element_scale */
      } break;

      case gain_element_lists: {
        const CodeBookDescription *hcb;
        UCHAR *pCodeBook;
        int c;

        hcb = &AACcodeBookDescriptionTable[BOOKSCL];
        pCodeBook = pAacDecoderChannelInfo[ch]->pDynData->aCodeBook;

        for (c = 1; c < num_gain_element_lists; c++) {
          int cge;
          if (ind_sw_cce_flag) {
            cge = 1;
          } else {
            cge = FDKreadBits(hBs, 1); /* common_gain_element_present[c] */
          }
          if (cge) {
            /* Huffman */
            CBlock_DecodeHuffmanWord(
                hBs, hcb); /* hcod_sf[common_gain_element[c]] 1..19 */
          } else {
            int g, sfb;
            for (g = 0;
                 g < GetWindowGroups(&pAacDecoderChannelInfo[ch]->icsInfo);
                 g++) {
              for (sfb = 0; sfb < GetScaleFactorBandsTransmitted(
                                      &pAacDecoderChannelInfo[ch]->icsInfo);
                   sfb++) {
                if (pCodeBook[sfb] != ZERO_HCB) {
                  /* Huffman */
                  CBlock_DecodeHuffmanWord(
                      hBs,
                      hcb); /* hcod_sf[dpcm_gain_element[c][g][sfb]] 1..19 */
                }
              }
            }
          }
        }
      } break;

        /* CRC handling */
      case adtscrc_start_reg1:
        if (pTpDec != NULL) {
          crcReg1 = transportDec_CrcStartReg(pTpDec, 192);
        }
        break;
      case adtscrc_start_reg2:
        if (pTpDec != NULL) {
          crcReg2 = transportDec_CrcStartReg(pTpDec, 128);
        }
        break;
      case adtscrc_end_reg1:
      case drmcrc_end_reg:
        if (pTpDec != NULL) {
          transportDec_CrcEndReg(pTpDec, crcReg1);
          crcReg1 = -1;
        }
        break;
      case adtscrc_end_reg2:
        if (crcReg1 != -1) {
          error = AAC_DEC_DECODE_FRAME_ERROR;
        } else if (pTpDec != NULL) {
          transportDec_CrcEndReg(pTpDec, crcReg2);
          crcReg2 = -1;
        }
        break;
      case drmcrc_start_reg:
        if (pTpDec != NULL) {
          crcReg1 = transportDec_CrcStartReg(pTpDec, 0);
        }
        break;

        /* Non data cases */
      case next_channel:
        ch = (ch + 1) % numberOfChannels;
        break;
      case link_sequence:
        list = list->next[decision_bit];
        i = -1;
        break;

      default:
        error = AAC_DEC_UNSUPPORTED_FORMAT;
        break;
    }

    if (error != AAC_DEC_OK) {
      goto bail;
    }

    i++;

  } while (list->id[i] != end_of_sequence);

  for (ch = 0; ch < numberOfChannels; ch++) {
    if (pAacDecoderChannelInfo[ch]->renderMode == AACDEC_RENDER_IMDCT ||
        pAacDecoderChannelInfo[ch]->renderMode == AACDEC_RENDER_ELDFB) {
      /* Shows which bands are empty. */
      UCHAR *band_is_noise =
          pAacDecoderChannelInfo[ch]->pDynData->band_is_noise;
      FDKmemset(band_is_noise, (UCHAR)1, sizeof(UCHAR) * (8 * 16));

      error = CBlock_InverseQuantizeSpectralData(
          pAacDecoderChannelInfo[ch], pSamplingRateInfo, band_is_noise, 1);
      if (error != AAC_DEC_OK) {
        return error;
      }

      if (elFlags & AC_EL_USAC_NOISE) {
        CBlock_ApplyNoise(pAacDecoderChannelInfo[ch], pSamplingRateInfo,
                          &pAacDecoderStaticChannelInfo[ch]->nfRandomSeed,
                          band_is_noise);

      } /* if (elFlags & AC_EL_USAC_NOISE) */
    }
  }

bail:
  if (crcReg1 != -1 || crcReg2 != -1) {
    if (error == AAC_DEC_OK) {
      error = AAC_DEC_DECODE_FRAME_ERROR;
    }
    if (crcReg1 != -1) {
      transportDec_CrcEndReg(pTpDec, crcReg1);
    }
    if (crcReg2 != -1) {
      transportDec_CrcEndReg(pTpDec, crcReg2);
    }
  }
  return error;
}