예제 #1
0
/*!
  \brief     SBR decoder processing

 \return SBRDEC_OK if successfull, else error code
*/
SBR_ERROR
applySBR (SBRDECODER self,
          SBRBITSTREAM * Bitstr,
          float *timeData,
          float *workBufferCore,
		  int *numChannels,
          int SbrFrameOK,
          int bDownSample,
          int bBitstreamDownMix
          )
{
  unsigned char i;
  unsigned char dualMono = 0;
  int stereo = 0;
  int CRCLen = 0;
  int crcEnable = 0;
  int readHeader = 0;
  int err = 0;


  SBR_CHANNEL *SbrChannel = &self->SbrChannel[0];
  BIT_BUFFER bitBuf;
  HANDLE_SBR_HEADER_DATA_DEC hHeaderData = &self->sbr_header;
  SBR_HEADER_STATUS headerStatus = HEADER_NOT_INITIALIZED;
  int codecFrameSize = hHeaderData->codecFrameSize;
  SBR_SYNC_STATE initialSyncState = hHeaderData->syncState;
  HANDLE_SBR_CONCEAL_DATA hConcealData = &self->SbrConcealData;

  float * pWorkBuffer1 = &timeData[2*codecFrameSize];

  SBR_FRAME_DATA *hFrameDataLeft  = (SBR_FRAME_DATA*) pWorkBuffer1;
  SBR_FRAME_DATA *hFrameDataRight = (SBR_FRAME_DATA*) self->InterimResult;
  assert( sizeof(SBR_FRAME_DATA) <= MAX_FRAME_SIZE*sizeof(float));

  self->SbrChannel->SbrDec.workBuffer2 = workBufferCore;
  FLC_sub_start("applySBR");

  INDIRECT(5); MOVE(9); PTR_INIT(6); /* counting previous operations */

  PTR_INIT(1); FUNC(3);
  DelaySbrBitstr(hConcealData, Bitstr, &SbrFrameOK);


  INDIRECT(1); BRANCH(1);
  if (Bitstr->NrElements) {

    PTR_INIT(6); /* Bitstr->sbrElement[]
                    SbrChannel[]
                    hHeaderData
                    hFrameDataLeft
                    hFrameDataRight
                    bitBuf
                 */
    INDIRECT(1); LOOP(1);
    for (i=0; i<Bitstr->NrElements; i++) {

      /* Save last error flag */
      MOVE(1);
      hHeaderData->prevFrameErrorFlag = hHeaderData->frameErrorFlag;

      ADD(1); BRANCH(1);
      if (Bitstr->NrElements == 2) {
        MOVE(1);
        dualMono = 1;
      }
      else {
        BRANCH(2);
        switch (Bitstr->sbrElement[i].ElementID) {
          case SBR_ID_SCE:
            MOVE(1);
            stereo = 0;
            break;

          case SBR_ID_CPE:
            MOVE(1);
            stereo = 1;
            break;

          default:
            MOVE(1);
            SbrFrameOK = 0;
        }
      }

      MULT(1); FUNC(3);
      initBitBuffer (&bitBuf,
                     Bitstr->sbrElement[i].Data,
                     Bitstr->sbrElement[i].Payload * 8) ;

      FUNC(2);
      getbits (&bitBuf, LEN_NIBBLE);


      BRANCH(1);
      if (SbrFrameOK) {

        ADD(1); BRANCH(1);
        if (Bitstr->sbrElement[i].ExtensionType == SBR_EXTENSION_CRC) {

          MOVE(1);
          crcEnable = 1;

          ADD(2); MULT(1);
          CRCLen = 8*(Bitstr->sbrElement[i].Payload-1)+4 - SI_SBR_CRC_BITS;

          BRANCH(1);
          if (CRCLen < 0) {

            MOVE(2);
            crcEnable = 0;
            SbrFrameOK = 0;
          }
        }


        BRANCH(1);
        if (crcEnable)
        {
          FUNC(2);
          SbrFrameOK = SbrCrcCheck (&bitBuf,
                                    CRCLen);
        }

        FUNC(2);
        readHeader = getbits (&bitBuf, 1);

        BRANCH(1);
        if (SbrFrameOK){
          int lr;

          FUNC(1);
          if (readHeader) {

            FUNC(3);
            headerStatus = sbrGetHeaderData (hHeaderData,
                                             &bitBuf,
                                             (SBR_ELEMENT_ID)Bitstr->sbrElement[i].ElementID);

            ADD(1); BRANCH(1);
            if (headerStatus == HEADER_NOT_INITIALIZED) {
              FLC_sub_end();
              return SBRDEC_NOT_INITIALIZED;
            }

            ADD(1); BRANCH(1);
            if (headerStatus == HEADER_RESET) {
              FUNC(1);
              err = resetFreqBandTables(hHeaderData);

              PTR_INIT(1); /* SbrChannel[] */
              LOOP(1);
              for (lr = 0 ; lr < MAXNRSBRCHANNELS; lr++) {
                INDIRECT(1); PTR_INIT(1); FUNC(1);
                resetSbrEnvelopeCalc (&(SbrChannel[lr].SbrDec.SbrCalculateEnvelope));
              }

 PTR_INIT(1); /* SbrChannel[] */
              LOOP(1);
              for (lr = 0 ; lr < MAXNRQMFCHANNELS; lr++) {
#ifdef NON_BE_BUGFIX
                PTR_INIT(1); FUNC(5);
#else
                PTR_INIT(1); FUNC(4);
#endif
                err |= resetSbrQMF (&(SbrChannel[lr].SbrDec),
                                    hHeaderData,
                                    lr,
#ifdef NON_BE_BUGFIX
                                    *numChannels,
#endif
                                    SbrChannel[lr].hPrevFrameData);
              }

              BRANCH(1);
              if (err==0) {

                MOVE(1);
                hHeaderData->syncState = SBR_ACTIVE;
              }
            }
          } // if (readHeader)

          ADD(1); LOGIC(1); BRANCH(1);
          if (err || hHeaderData->syncState == SBR_NOT_INITIALIZED) {

            ADD(1); LOGIC(1); BRANCH(1);
            if (err && hHeaderData->syncState == SBR_NOT_INITIALIZED) {
              FLC_sub_end();
              return SBRDEC_NOT_INITIALIZED;
            }

            SHIFT(1); FUNC(3);
            initHeaderData( hHeaderData,
                            hHeaderData->outSampleRate >> 1,
                            codecFrameSize);

            FUNC(1);
            err = resetFreqBandTables(hHeaderData);

            MOVE(2);
            hHeaderData->FreqBandData.lowSubband = NO_ANALYSIS_CHANNELS;
            hHeaderData->FreqBandData.highSubband = NO_ANALYSIS_CHANNELS;

            PTR_INIT(1); /* SbrChannel[lr] */
            LOOP(1);
            for (lr = 0 ; lr < MAXNRSBRCHANNELS; lr++) {
              INDIRECT(1); PTR_INIT(1); FUNC(1);
              resetSbrEnvelopeCalc (&(SbrChannel[lr].SbrDec.SbrCalculateEnvelope));
            }

            PTR_INIT(1); /* SbrChannel[lr] */
            LOOP(1);
            for (lr = 0 ; lr < MAXNRQMFCHANNELS; lr++) {
#ifdef NON_BE_BUGFIX
              PTR_INIT(1); FUNC(5);
#else
              PTR_INIT(1); FUNC(4);
#endif
              err |= resetSbrQMF (&(SbrChannel[lr].SbrDec),
                                  hHeaderData,
                                  lr,
#ifdef NON_BE_BUGFIX
                                  *numChannels,
#endif
                                  SbrChannel[lr].hPrevFrameData);
            }

            MOVE(1);
            hHeaderData->syncState = UPSAMPLING;
          }


          ADD(1); BRANCH(1);
          if (hHeaderData->syncState == SBR_ACTIVE) {


            BRANCH(1);
            if (dualMono) {

              BRANCH(1);
              if (i == 0) {

                BRANCH(1); MOVE(1);
                hFrameDataLeft->xposCtrl = max(0, SbrChannel[i].hPrevFrameData->xposCtrl);

                FUNC(4);
                SbrFrameOK = sbrGetSingleChannelElement(hHeaderData,
                                                        hFrameDataLeft,
                                                        NULL,
                                                        &bitBuf);
              }
              else {

                BRANCH(1); MOVE(1);
                hFrameDataRight->xposCtrl = max(0, SbrChannel[i].hPrevFrameData->xposCtrl);

                FUNC(4);
                SbrFrameOK = sbrGetSingleChannelElement(hHeaderData,
                                                        hFrameDataRight,
                                                        NULL,
                                                        &bitBuf);
              }
            }
            else {
              BRANCH(1); MOVE(1);
              hFrameDataLeft->xposCtrl = max(0, SbrChannel[i].hPrevFrameData->xposCtrl);

              BRANCH(1);
              if (stereo) {

                BRANCH(1); MOVE(1);
                hFrameDataRight->xposCtrl = max(0, SbrChannel[i+1].hPrevFrameData->xposCtrl);

                FUNC(4);
                SbrFrameOK = sbrGetChannelPairElement(hHeaderData,
                                                      hFrameDataLeft,
                                                      hFrameDataRight,
                                                      &bitBuf);
              }
              else
              {


                BRANCH(1);
                if (bBitstreamDownMix)
                {
                  MOVE(1);
                  self->ParametricStereoDec.bForceMono = 1;
                }
                else
                {
                  MOVE(1);
                  self->ParametricStereoDec.bForceMono = 0;
                }

                FUNC(4);
                SbrFrameOK = sbrGetSingleChannelElement(hHeaderData,
                                                        hFrameDataLeft,
                                                        &self->ParametricStereoDec,
                                                        &bitBuf);
              }
            }
            {
              int payloadbits = GetNrBitsRead (&bitBuf);
              int fillbits = (8 - (payloadbits & 7)) & 7;

              FUNC(1); ADD(1); LOGIC(2); /* counting previous operations */

              ADD(2); MULT(1); BRANCH(1);
              if ((payloadbits + fillbits) != 8 * Bitstr->sbrElement[i].Payload)
              {
                MOVE(1);
                SbrFrameOK = 0;
              }
            }
           }
        }
      }

      ADD(1); LOGIC(1); BRANCH(1);
      if (!SbrFrameOK || headerStatus == CONCEALMENT) {

        MOVE(1);
        hHeaderData->frameErrorFlag = 1;
      }
    }
예제 #2
0
SBR_ERROR sbrDecoder_Parse(
        HANDLE_SBRDECODER self,
        HANDLE_FDK_BITSTREAM  hBs,
        int *count,
        int  bsPayLen,
        int  crcFlag,
        MP4_ELEMENT_ID prevElement,
        int elementIndex,
        int fGlobalIndependencyFlag
        )
{
  SBR_DECODER_ELEMENT   *hSbrElement;
  HANDLE_SBR_HEADER_DATA hSbrHeader;
  HANDLE_SBR_CHANNEL    *pSbrChannel;

  SBR_FRAME_DATA *hFrameDataLeft;
  SBR_FRAME_DATA *hFrameDataRight;

  SBR_ERROR errorStatus = SBRDEC_OK;
  SBR_SYNC_STATE initialSyncState;
  SBR_HEADER_STATUS headerStatus = HEADER_NOT_PRESENT;

  INT  startPos;
  INT  CRCLen = 0;

  int  stereo;
  int  fDoDecodeSbrData = 1;

  int lastSlot, lastHdrSlot = 0, thisHdrSlot;

  /* Remember start position of  SBR element */
  startPos = FDKgetValidBits(hBs);

  /* SBR sanity checks */
  if ( self == NULL || self->pSbrElement[elementIndex] == NULL ) {
    errorStatus = SBRDEC_NOT_INITIALIZED;
    goto bail;
  } 

  hSbrElement = self->pSbrElement[elementIndex];

  lastSlot    = (hSbrElement->useFrameSlot > 0) ? hSbrElement->useFrameSlot-1 : self->numDelayFrames;
  lastHdrSlot =  hSbrElement->useHeaderSlot[lastSlot];
  thisHdrSlot =  getHeaderSlot( hSbrElement->useFrameSlot, hSbrElement->useHeaderSlot );  /* Get a free header slot not used by frames not processed yet. */

  /* Assign the free slot to store a new header if there is one. */
  hSbrHeader = &self->sbrHeader[elementIndex][thisHdrSlot];

  pSbrChannel = hSbrElement->pSbrChannel;
  stereo = (hSbrElement->elementID == ID_CPE) ? 1 : 0;

  hFrameDataLeft  = &self->pSbrElement[elementIndex]->pSbrChannel[0]->frameData[hSbrElement->useFrameSlot];
  hFrameDataRight = &self->pSbrElement[elementIndex]->pSbrChannel[1]->frameData[hSbrElement->useFrameSlot];

  initialSyncState = hSbrHeader->syncState;

  /* reset PS flag; will be set after PS was found */
  self->flags &= ~SBRDEC_PS_DECODED;

  if (hSbrHeader->status & SBRDEC_HDR_STAT_UPDATE) {
    /* Got a new header from extern (e.g. from an ASC) */
    headerStatus = HEADER_OK;
    hSbrHeader->status &= ~SBRDEC_HDR_STAT_UPDATE;
  }
  else if (thisHdrSlot != lastHdrSlot) {
    /* Copy the last header into this slot otherwise the
       header compare will trigger more HEADER_RESETs than needed. */
    copySbrHeader( hSbrHeader, &self->sbrHeader[elementIndex][lastHdrSlot] );
  }

  /*
     Check if bit stream data is valid and matches the element context
  */
  if ( ((prevElement != ID_SCE) && (prevElement != ID_CPE)) || prevElement != hSbrElement->elementID) {
    /* In case of LFE we also land here, since there is no LFE SBR element (do upsampling only) */
    fDoDecodeSbrData = 0;
  }

  if (fDoDecodeSbrData)
  {
    if ((INT)FDKgetValidBits(hBs) <= 0) {
      fDoDecodeSbrData = 0;
    }
  }

  /*
     SBR CRC-check
  */
  if (fDoDecodeSbrData)
  {
    if (crcFlag == 1) {
      switch (self->coreCodec) {
      case AOT_ER_AAC_ELD:
        FDKpushFor (hBs, 10);
        /* check sbrcrc later: we don't know the payload length now */
        break;
      default:
        CRCLen = bsPayLen - 10;                     /* change: 0 => i */
        if (CRCLen < 0) {
          fDoDecodeSbrData = 0;
        } else {
          fDoDecodeSbrData = SbrCrcCheck (hBs, CRCLen);
        }
        break;
      }
    }
  } /* if (fDoDecodeSbrData) */

  /*
     Read in the header data and issue a reset if change occured
  */
  if (fDoDecodeSbrData)
  {
    int sbrHeaderPresent;

    {
      sbrHeaderPresent = FDKreadBit(hBs);
    }

    if ( sbrHeaderPresent ) {
      headerStatus = sbrGetHeaderData (hSbrHeader,
                                       hBs,
                                       self->flags,
                                       1);
    }

    if (headerStatus == HEADER_RESET)
    {
      errorStatus = sbrDecoder_HeaderUpdate(
            self,
            hSbrHeader,
            headerStatus,
            pSbrChannel,
            hSbrElement->nChannels 
            );

      if (errorStatus == SBRDEC_OK) {
        hSbrHeader->syncState = SBR_HEADER;
      } else {
        hSbrHeader->syncState = SBR_NOT_INITIALIZED;
      }
    }

    if (errorStatus != SBRDEC_OK) {
      fDoDecodeSbrData = 0;
    }
  } /* if (fDoDecodeSbrData) */

  /*
    Print debugging output only if state has changed
  */

  /* read frame data */
  if ((hSbrHeader->syncState >= SBR_HEADER) && fDoDecodeSbrData) {
    int sbrFrameOk;
    /* read the SBR element data */
    if (stereo) {
      sbrFrameOk = sbrGetChannelPairElement(hSbrHeader,
                                            hFrameDataLeft,
                                            hFrameDataRight,
                                            hBs,
                                            self->flags,
                                            self->pSbrElement[elementIndex]->transposerSettings.overlap);
    }
    else {
      if (self->hParametricStereoDec != NULL) {
        /* update slot index for PS bitstream parsing */
        self->hParametricStereoDec->bsLastSlot = self->hParametricStereoDec->bsReadSlot;
        self->hParametricStereoDec->bsReadSlot = hSbrElement->useFrameSlot;
      }
      sbrFrameOk = sbrGetSingleChannelElement(hSbrHeader,
                                              hFrameDataLeft,
                                              hBs,
                                              self->hParametricStereoDec,
                                              self->flags,
                                              self->pSbrElement[elementIndex]->transposerSettings.overlap);
    }
    if (!sbrFrameOk) {
      fDoDecodeSbrData = 0;
    }
    else {
      INT valBits;

      if (bsPayLen > 0) {
        valBits = bsPayLen - ((INT)startPos - (INT)FDKgetValidBits(hBs));
      } else {
        valBits = (INT)FDKgetValidBits(hBs);
      }

      if ( crcFlag == 1 ) {
        switch (self->coreCodec) {
        case AOT_ER_AAC_ELD:
          {
            /* late crc check for eld */
            INT payloadbits = (INT)startPos - (INT)FDKgetValidBits(hBs) - startPos;
            INT crcLen      = payloadbits - 10;
            FDKpushBack(hBs, payloadbits);
            fDoDecodeSbrData      = SbrCrcCheck (hBs, crcLen);
            FDKpushFor(hBs, crcLen);
          }
          break;
        default:
          break;
        }
      }

      /* sanity check of remaining bits */
      if (valBits < 0) {
        fDoDecodeSbrData = 0;
      } else {
        switch (self->coreCodec) {
        case AOT_SBR:
        case AOT_PS:
        case AOT_AAC_LC:
          {
            /* This sanity check is only meaningful with General Audio bitstreams */
            int alignBits = valBits & 0x7;

            if (valBits > alignBits) {
              fDoDecodeSbrData = 0;
            }
          }
          break;
        default:
          /* No sanity check available */
          break;
        }
      }
    }
  } else {
    /* The returned bit count will not be the actual payload size since we did not
       parse the frame data. Return an error so that the caller can react respectively. */
    errorStatus = SBRDEC_PARSE_ERROR;
  }

  if (!fDoDecodeSbrData) {
    /* Set error flag for this slot to trigger concealment */
    self->pSbrElement[elementIndex]->frameErrorFlag[hSbrElement->useFrameSlot] = 1;
    errorStatus = SBRDEC_PARSE_ERROR;
  } else {
    /* Everything seems to be ok so clear the error flag */
    self->pSbrElement[elementIndex]->frameErrorFlag[hSbrElement->useFrameSlot] = 0;
  }

  if (!stereo) {
    /* Turn coupling off explicitely to avoid access to absent right frame data
       that might occur with corrupt bitstreams. */
    hFrameDataLeft->coupling = COUPLING_OFF;
  }

bail:
  if (errorStatus == SBRDEC_OK) {
    if (headerStatus == HEADER_NOT_PRESENT) {
      /* Use the old header for this frame */
      hSbrElement->useHeaderSlot[hSbrElement->useFrameSlot] = lastHdrSlot;
    } else {
      /* Use the new header for this frame */
      hSbrElement->useHeaderSlot[hSbrElement->useFrameSlot] = thisHdrSlot;
    }

    /* Move frame pointer to the next slot which is up to be decoded/applied next */
    hSbrElement->useFrameSlot = (hSbrElement->useFrameSlot+1) % (self->numDelayFrames+1);
  }

  *count -= startPos - FDKgetValidBits(hBs);

  return errorStatus;
}