/*! * \copy *     Copyright (c)  2013, Cisco Systems *     All rights reserved. * *     Redistribution and use in source and binary forms, with or without *     modification, are permitted provided that the following conditions *     are met: * *        * Redistributions of source code must retain the above copyright *          notice, this list of conditions and the following disclaimer. * *        * Redistributions in binary form must reproduce the above copyright *          notice, this list of conditions and the following disclaimer in *          the documentation and/or other materials provided with the *          distribution. * *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *     "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT *     LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS *     FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE *     COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, *     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, *     BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER *     CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT *     LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN *     ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE *     POSSIBILITY OF SUCH DAMAGE. * *      decoder_core.c: Wels decoder framework core implementation */ #include "decoder_core.h"#include "error_code.h"#include "memmgr_nal_unit.h"#include "au_parser.h"#include "decode_slice.h"#include "manage_dec_ref.h"#include "expand_pic.h"#include "decoder.h"#include "decode_mb_aux.h"#include "memory_align.h"#include "error_concealment.h" namespace WelsDec {static inline int32_t DecodeFrameConstruction (PWelsDecoderContext pCtx, uint8_t** ppDst, SBufferInfo* pDstInfo) {  PDqLayer pCurDq = pCtx->pCurDqLayer;  PPicture pPic = pCtx->pDec;   const int32_t kiWidth = pCurDq->iMbWidth << 4;  const int32_t kiHeight = pCurDq->iMbHeight << 4;   const int32_t kiTotalNumMbInCurLayer = pCurDq->iMbWidth * pCurDq->iMbHeight;  bool bFrameCompleteFlag = true;   if (pPic->bNewSeqBegin) {    memcpy (& (pCtx->sFrameCrop), & (pCurDq->sLayerInfo.sSliceInLayer.sSliceHeaderExt.sSliceHeader.pSps->sFrameCrop),            sizeof (SPosOffset)); //confirmed_safe_unsafe_usage#ifdef LONG_TERM_REF    pCtx->bParamSetsLostFlag      = false;#else    pCtx->bReferenceLostAtT0Flag = false;	// need initialize it due new seq, 6/4/2010#endif //LONG_TERM_REF    if (pCtx->iTotalNumMbRec == kiTotalNumMbInCurLayer) {      pCtx->bPrintFrameErrorTraceFlag = true;      WelsLog (& (pCtx->sLogCtx), WELS_LOG_INFO,               "DecodeFrameConstruction(): will output first frame of new sequence, %d x %d, crop_left:%d, crop_right:%d, crop_top:%d, crop_bottom:%d, ignored error packet:%d.",               kiWidth, kiHeight, pCtx->sFrameCrop.iLeftOffset, pCtx->sFrameCrop.iRightOffset, pCtx->sFrameCrop.iTopOffset,               pCtx->sFrameCrop.iBottomOffset, pCtx->iIgnoredErrorInfoPacketCount);      pCtx->iIgnoredErrorInfoPacketCount = 0;    }  }   if (pCtx->bParseOnly) { //should exit for parse only to prevent access NULL pDstInfo    PAccessUnit pCurAu = pCtx->pAccessUnitList;    if (dsErrorFree == pCtx->iErrorCode) { //correct decoding, add to data buffer      SParserBsInfo* pParser = pCtx->pParserBsInfo;      SNalUnit* pCurNal = NULL;      int32_t iTotalNalLen = 0;      int32_t iNalLen = 0;      int32_t iNum = 0;      while (iNum < pParser->iNalNum) {        iTotalNalLen += pParser->iNalLenInByte[iNum++];      }      uint8_t* pDstBuf = pParser->pDstBuff + iTotalNalLen;      int32_t iIdx = pCurAu->uiStartPos;      int32_t iEndIdx = pCurAu->uiEndPos;      uint8_t* pNalBs = NULL;      pParser->uiOutBsTimeStamp = (pCurAu->pNalUnitsList [iIdx]) ? pCurAu->pNalUnitsList [iIdx]->uiTimeStamp : 0;      //pParser->iNalNum = 0;      pParser->iSpsWidthInPixel = (pCtx->pSps->iMbWidth << 4);      pParser->iSpsHeightInPixel = (pCtx->pSps->iMbHeight << 4);       if (pCurAu->pNalUnitsList [iIdx]->sNalHeaderExt.bIdrFlag) { //IDR        if (pCtx->bFrameFinish) { //add required sps/pps          bool bSubSps = (NAL_UNIT_CODED_SLICE_EXT == pCurAu->pNalUnitsList [iIdx]->sNalHeaderExt.sNalUnitHeader.eNalUnitType);          SSpsBsInfo* pSpsBs = NULL;          SPpsBsInfo* pPpsBs = NULL;          int32_t iSpsId = pCtx->pSps->iSpsId;          int32_t iPpsId = pCtx->pPps->iPpsId;          pCtx->bParamSetsLostFlag = false;          //find required sps, pps and write into dst buff          pSpsBs = bSubSps ? &pCtx->sSubsetSpsBsInfo [iSpsId] : &pCtx->sSpsBsInfo [iSpsId];          memcpy (pDstBuf, pSpsBs->pSpsBsBuf, pSpsBs->uiSpsBsLen);          pParser->iNalLenInByte [pParser->iNalNum ++] = pSpsBs->uiSpsBsLen;          pCtx->iNalLenInByte[pCtx->iNalNum ++] = pSpsBs->uiSpsBsLen;          pDstBuf += pSpsBs->uiSpsBsLen;          pPpsBs = &pCtx->sPpsBsInfo [iPpsId];          memcpy (pDstBuf, pPpsBs->pPpsBsBuf, pPpsBs->uiPpsBsLen);          pParser->iNalLenInByte [pParser->iNalNum ++] = pPpsBs->uiPpsBsLen;          pDstBuf += pPpsBs->uiPpsBsLen;          pCtx->bFrameFinish = false;        }      }      //then VCL data re-write      while (iIdx <= iEndIdx) {        pCurNal = pCurAu->pNalUnitsList [iIdx ++];        iNalLen = pCurNal->sNalData.sVclNal.iNalLength;        pNalBs = pCurNal->sNalData.sVclNal.pNalPos;        pParser->iNalLenInByte [pParser->iNalNum ++] = iNalLen;        memcpy (pDstBuf, pNalBs, iNalLen);        pDstBuf += iNalLen;      }      if (pCtx->iTotalNumMbRec == kiTotalNumMbInCurLayer) { //frame complete        pCtx->iTotalNumMbRec = 0;        pCtx->bFramePending = false;        pCtx->bFrameFinish = true; //finish current frame and mark it      } else if (pCtx->iTotalNumMbRec != 0) { //frame incomplete        pCtx->bFramePending = true;        pCtx->pDec->bIsComplete = false;        pCtx->bFrameFinish = false; //current frame not finished        pCtx->iErrorCode |= dsFramePending;        return -1;        //pCtx->pParserBsInfo->iNalNum = 0;      }    } else { //error      pCtx->pParserBsInfo->uiOutBsTimeStamp = 0;      pCtx->pParserBsInfo->iNalNum = 0;      pCtx->pParserBsInfo->iSpsWidthInPixel = 0;      pCtx->pParserBsInfo->iSpsHeightInPixel = 0;      return -1;    }    return 0;  }   if (pCtx->iTotalNumMbRec != kiTotalNumMbInCurLayer) {    WelsLog (& (pCtx->sLogCtx), WELS_LOG_DEBUG,             "DecodeFrameConstruction(): iTotalNumMbRec:%d, total_num_mb_sps:%d, cur_layer_mb_width:%d, cur_layer_mb_height:%d ",             pCtx->iTotalNumMbRec, kiTotalNumMbInCurLayer, pCurDq->iMbWidth, pCurDq->iMbHeight);    bFrameCompleteFlag = false; //return later after output buffer is done    if (pCtx->bInstantDecFlag) //no-delay decoding, wait for new slice      return -1;  } else if (pCurDq->sLayerInfo.sNalHeaderExt.bIdrFlag             && (pCtx->iErrorCode == dsErrorFree)) { //complete non-ECed IDR frame done    pCtx->pDec->bIsComplete = true;    pCtx->bFreezeOutput = false;  }   pCtx->iTotalNumMbRec = 0;   //////output:::normal path  pDstInfo->uiOutYuvTimeStamp = pPic->uiTimeStamp;  ppDst[0]      = pPic->pData[0];  ppDst[1]      = pPic->pData[1];  ppDst[2]      = pPic->pData[2];   pDstInfo->UsrData.sSystemBuffer.iFormat = videoFormatI420;   pDstInfo->UsrData.sSystemBuffer.iWidth = kiWidth - (pCtx->sFrameCrop.iLeftOffset + pCtx->sFrameCrop.iRightOffset) * 2;  pDstInfo->UsrData.sSystemBuffer.iHeight = kiHeight - (pCtx->sFrameCrop.iTopOffset + pCtx->sFrameCrop.iBottomOffset) * 2;  pDstInfo->UsrData.sSystemBuffer.iStride[0] = pPic->iLinesize[0];  pDstInfo->UsrData.sSystemBuffer.iStride[1] = pPic->iLinesize[1];  ppDst[0] = ppDst[0] + pCtx->sFrameCrop.iTopOffset * 2 * pPic->iLinesize[0] + pCtx->sFrameCrop.iLeftOffset * 2;  ppDst[1] = ppDst[1] + pCtx->sFrameCrop.iTopOffset  * pPic->iLinesize[1] + pCtx->sFrameCrop.iLeftOffset;  ppDst[2] = ppDst[2] + pCtx->sFrameCrop.iTopOffset  * pPic->iLinesize[1] + pCtx->sFrameCrop.iLeftOffset;  pDstInfo->iBufferStatus = 1;   bool bOutResChange = (pCtx->iLastImgWidthInPixel != pDstInfo->UsrData.sSystemBuffer.iWidth)                       || (pCtx->iLastImgHeightInPixel != pDstInfo->UsrData.sSystemBuffer.iHeight);  pCtx->iLastImgWidthInPixel = pDstInfo->UsrData.sSystemBuffer.iWidth;  pCtx->iLastImgHeightInPixel = pDstInfo->UsrData.sSystemBuffer.iHeight;  if (pCtx->eErrorConMethod == ERROR_CON_DISABLE) //no buffer output if EC is disabled and frame incomplete    pDstInfo->iBufferStatus = (int32_t) (bFrameCompleteFlag                                         && pPic->bIsComplete); // When EC disable, ECed picture not output  else if ((pCtx->eErrorConMethod == ERROR_CON_SLICE_COPY_CROSS_IDR_FREEZE_RES_CHANGE            || pCtx->eErrorConMethod == ERROR_CON_SLICE_MV_COPY_CROSS_IDR_FREEZE_RES_CHANGE)           && pCtx->iErrorCode && bOutResChange)    pCtx->bFreezeOutput = true;   if (pDstInfo->iBufferStatus == 0) {    if (!bFrameCompleteFlag)      pCtx->iErrorCode |= dsBitstreamError;    return -1;  }  if (pCtx->bFreezeOutput) {    pDstInfo->iBufferStatus = 0;    if (pPic->bNewSeqBegin) {      WelsLog (& (pCtx->sLogCtx), WELS_LOG_INFO, "DecodeFrameConstruction():New sequence detected, but freezed.");    }  }  pCtx->iMbEcedNum = pPic->iMbEcedNum;  pCtx->iMbNum = pPic->iMbNum;  pCtx->iMbEcedPropNum = pPic->iMbEcedPropNum;  UpdateDecStat (pCtx, pDstInfo->iBufferStatus != 0);   return 0;} inline bool    CheckSliceNeedReconstruct (uint8_t uiLayerDqId, uint8_t uiTargetDqId) {  return (uiLayerDqId == uiTargetDqId); // target layer} inline uint8_t GetTargetDqId (uint8_t uiTargetDqId,  SDecodingParam* psParam) {  uint8_t  uiRequiredDqId = psParam ? psParam->uiTargetDqLayer : (uint8_t)255;   return WELS_MIN (uiTargetDqId, uiRequiredDqId);}  inline void    HandleReferenceLostL0 (PWelsDecoderContext pCtx, PNalUnit pCurNal) {  if (0 == pCurNal->sNalHeaderExt.uiTemporalId) {    pCtx->bReferenceLostAtT0Flag = true;  }  pCtx->iErrorCode |= dsBitstreamError;} inline void    HandleReferenceLost (PWelsDecoderContext pCtx, PNalUnit pCurNal) {  if ((0 == pCurNal->sNalHeaderExt.uiTemporalId) || (1 == pCurNal->sNalHeaderExt.uiTemporalId)) {    pCtx->bReferenceLostAtT0Flag = true;  }  pCtx->iErrorCode |= dsRefLost;} inline int32_t  WelsDecodeConstructSlice (PWelsDecoderContext pCtx, PNalUnit pCurNal) {  int32_t  iRet = WelsTargetSliceConstruction (pCtx);   if (iRet) {    HandleReferenceLostL0 (pCtx, pCurNal);  }   return iRet;} int32_t ParsePredWeightedTable (PBitStringAux pBs, PSliceHeader pSh) {  uint32_t uiCode;  int32_t iList = 0;  int32_t iCode;   WELS_READ_VERIFY (BsGetUe (pBs, &uiCode));  WELS_CHECK_SE_BOTH_ERROR_NOLOG (uiCode, 0, 7, "luma_log2_weight_denom",                                  GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_INVALID_LUMA_LOG2_WEIGHT_DENOM));  pSh->sPredWeightTable.uiLumaLog2WeightDenom = uiCode;  if (pSh->pSps->uiChromaArrayType != 0) {    WELS_READ_VERIFY (BsGetUe (pBs, &uiCode));    WELS_CHECK_SE_BOTH_ERROR_NOLOG (uiCode, 0, 7, "chroma_log2_weight_denom",                                    GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_INVALID_CHROMA_LOG2_WEIGHT_DENOM));    pSh->sPredWeightTable.uiChromaLog2WeightDenom = uiCode;  }    do {     for (int i = 0; i < pSh->uiRefCount[iList]; i++) {      //luma      WELS_READ_VERIFY (BsGetOneBit (pBs, &uiCode));      if (!!uiCode) {         WELS_READ_VERIFY (BsGetSe (pBs, &iCode));        WELS_CHECK_SE_BOTH_ERROR_NOLOG (iCode, -128, 127, "luma_weight",                                        GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_INVALID_LUMA_WEIGHT));        pSh->sPredWeightTable.sPredList[iList].iLumaWeight[i] = iCode;         WELS_READ_VERIFY (BsGetSe (pBs, &iCode));        WELS_CHECK_SE_BOTH_ERROR_NOLOG (iCode, -128, 127, "luma_offset",                                        GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_INVALID_LUMA_OFFSET));        pSh->sPredWeightTable.sPredList[iList].iLumaOffset[i] = iCode;      } else {        pSh->sPredWeightTable.sPredList[iList].iLumaWeight[i] = 1 << (pSh->sPredWeightTable.uiLumaLog2WeightDenom);        pSh->sPredWeightTable.sPredList[iList].iLumaOffset[i] = 0;       }      //chroma      if (pSh->pSps->uiChromaArrayType == 0)        continue;       WELS_READ_VERIFY (BsGetOneBit (pBs, &uiCode));      if (!!uiCode) {        for (int j = 0; j < 2; j++) {            WELS_READ_VERIFY (BsGetSe (pBs, &iCode));          WELS_CHECK_SE_BOTH_ERROR_NOLOG (iCode, -128, 127, "chroma_weight",                                          GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_INVALID_CHROMA_WEIGHT));          pSh->sPredWeightTable.sPredList[iList].iChromaWeight[i][j] = iCode;           WELS_READ_VERIFY (BsGetSe (pBs, &iCode));          WELS_CHECK_SE_BOTH_ERROR_NOLOG (iCode, -128, 127, "chroma_offset",                                          GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_INVALID_CHROMA_OFFSET));          pSh->sPredWeightTable.sPredList[iList].iChromaOffset[i][j] = iCode;        }      } else {        for (int j = 0; j < 2; j++) {            pSh->sPredWeightTable.sPredList[iList].iChromaWeight[i][j] = 1 << (pSh->sPredWeightTable.uiChromaLog2WeightDenom);          pSh->sPredWeightTable.sPredList[iList].iChromaOffset[i][j] = 0;        }      }     }    ++iList;  } while (iList < LIST_1);//TODO: SUPPORT LIST_A  return ERR_NONE;} /* *  Predeclared function routines .. */int32_t ParseRefPicListReordering (PBitStringAux pBs, PSliceHeader pSh) {  int32_t iList = 0;  const EWelsSliceType keSt = pSh->eSliceType;  PRefPicListReorderSyn pRefPicListReordering = &pSh->pRefPicListReordering;  PSps pSps = pSh->pSps;  uint32_t uiCode;  if (keSt == I_SLICE || keSt == SI_SLICE)    return ERR_NONE;   // Common syntaxs for P or B slices: list0, list1 followed if B slices used.  do {    WELS_READ_VERIFY (BsGetOneBit (pBs, &uiCode)); //ref_pic_list_modification_flag_l0    pRefPicListReordering->bRefPicListReorderingFlag[iList]	= !!uiCode;     if (pRefPicListReordering->bRefPicListReorderingFlag[iList]) {      int32_t iIdx = 0;      do {        WELS_READ_VERIFY (BsGetUe (pBs, &uiCode)); //modification_of_pic_nums_idc        const uint32_t kuiIdc = uiCode;         //Fixed the referrence list reordering crash issue.(fault kIdc value > 3 case)---        if ((iIdx >= MAX_REF_PIC_COUNT) || (kuiIdc > 3)) {          return GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_INVALID_REF_REORDERING);        }        pRefPicListReordering->sReorderingSyn[iList][iIdx].uiReorderingOfPicNumsIdc	= kuiIdc;        if (kuiIdc == 3)          break;         if (iIdx >= pSh->uiRefCount[iList] || iIdx >= MAX_REF_PIC_COUNT)          return GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_INVALID_REF_REORDERING);         if (kuiIdc == 0 || kuiIdc == 1) {          // abs_diff_pic_num_minus1 should be in range 0 to MaxPicNum-1, MaxPicNum is derived as          // 2^(4+log2_max_frame_num_minus4)          WELS_READ_VERIFY (BsGetUe (pBs, &uiCode)); //abs_diff_pic_num_minus1          WELS_CHECK_SE_UPPER_ERROR_NOLOG (uiCode, (uint32_t) (1 << pSps->uiLog2MaxFrameNum), "abs_diff_pic_num_minus1",                                           GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_INVALID_REF_REORDERING));          pRefPicListReordering->sReorderingSyn[iList][iIdx].uiAbsDiffPicNumMinus1 = uiCode;	// uiAbsDiffPicNumMinus1        } else if (kuiIdc == 2) {          WELS_READ_VERIFY (BsGetUe (pBs, &uiCode)); //long_term_pic_num          pRefPicListReordering->sReorderingSyn[iList][iIdx].uiLongTermPicNum = uiCode;        }         ++ iIdx;      } while (true);    }    if (keSt != B_SLICE)      break;    ++ iList;  } while (iList < LIST_A);   return ERR_NONE;} int32_t ParseDecRefPicMarking (PWelsDecoderContext pCtx, PBitStringAux pBs, PSliceHeader pSh, PSps pSps,                               const bool kbIdrFlag) {  PRefPicMarking const kpRefMarking = &pSh->sRefMarking;  uint32_t uiCode;  if (kbIdrFlag) {    WELS_READ_VERIFY (BsGetOneBit (pBs, &uiCode)); //no_output_of_prior_pics_flag    kpRefMarking->bNoOutputOfPriorPicsFlag	= !!uiCode;    WELS_READ_VERIFY (BsGetOneBit (pBs, &uiCode)); //long_term_reference_flag    kpRefMarking->bLongTermRefFlag			= !!uiCode;  } else {    WELS_READ_VERIFY (BsGetOneBit (pBs, &uiCode)); //adaptive_ref_pic_marking_mode_flag    kpRefMarking->bAdaptiveRefPicMarkingModeFlag	= !!uiCode;    if (kpRefMarking->bAdaptiveRefPicMarkingModeFlag) {      int32_t iIdx = 0;      do {        WELS_READ_VERIFY (BsGetUe (pBs, &uiCode)); //memory_management_control_operation        const int32_t kiMmco = uiCode;         kpRefMarking->sMmcoRef[iIdx].uiMmcoType = kiMmco;        if (kiMmco == MMCO_END)          break;         if (kiMmco == MMCO_SHORT2UNUSED || kiMmco == MMCO_SHORT2LONG) {          WELS_READ_VERIFY (BsGetUe (pBs, &uiCode)); //difference_of_pic_nums_minus1          kpRefMarking->sMmcoRef[iIdx].iDiffOfPicNum = 1 + uiCode;          kpRefMarking->sMmcoRef[iIdx].iShortFrameNum = (pSh->iFrameNum - kpRefMarking->sMmcoRef[iIdx].iDiffOfPicNum) & ((                1 << pSps->uiLog2MaxFrameNum) - 1);        } else if (kiMmco == MMCO_LONG2UNUSED) {          WELS_READ_VERIFY (BsGetUe (pBs, &uiCode)); //long_term_pic_num          kpRefMarking->sMmcoRef[iIdx].uiLongTermPicNum = uiCode;        }        if (kiMmco == MMCO_SHORT2LONG || kiMmco == MMCO_LONG) {          WELS_READ_VERIFY (BsGetUe (pBs, &uiCode)); //long_term_frame_idx          kpRefMarking->sMmcoRef[iIdx].iLongTermFrameIdx = uiCode;        } else if (kiMmco == MMCO_SET_MAX_LONG) {          WELS_READ_VERIFY (BsGetUe (pBs, &uiCode)); //max_long_term_frame_idx_plus1          kpRefMarking->sMmcoRef[iIdx].iMaxLongTermFrameIdx = -1 + uiCode;        }        ++ iIdx;       } while (iIdx < MAX_MMCO_COUNT);    }  }   return ERR_NONE;} bool FillDefaultSliceHeaderExt (PSliceHeaderExt pShExt, PNalUnitHeaderExt pNalExt) {  if (pShExt == NULL || pNalExt == NULL)    return false;   if (pNalExt->iNoInterLayerPredFlag || pNalExt->uiQualityId > 0)    pShExt->bBasePredWeightTableFlag	= false;  else    pShExt->bBasePredWeightTableFlag	= true;  pShExt->uiRefLayerDqId = (uint8_t) - 1;  pShExt->uiDisableInterLayerDeblockingFilterIdc	= 0;  pShExt->iInterLayerSliceAlphaC0Offset			= 0;  pShExt->iInterLayerSliceBetaOffset				= 0;  pShExt->bConstrainedIntraResamplingFlag			= false;  pShExt->uiRefLayerChromaPhaseXPlus1Flag			= 0;  pShExt->uiRefLayerChromaPhaseYPlus1				= 1;  //memset(&pShExt->sScaledRefLayer, 0, sizeof(SPosOffset));   pShExt->iScaledRefLayerPicWidthInSampleLuma	= pShExt->sSliceHeader.iMbWidth << 4;  pShExt->iScaledRefLayerPicHeightInSampleLuma	= pShExt->sSliceHeader.iMbHeight << 4;   pShExt->bSliceSkipFlag	= false;  pShExt->bAdaptiveBaseModeFlag	= false;  pShExt->bDefaultBaseModeFlag	= false;  pShExt->bAdaptiveMotionPredFlag	= false;  pShExt->bDefaultMotionPredFlag	= false;  pShExt->bAdaptiveResidualPredFlag	= false;  pShExt->bDefaultResidualPredFlag	= false;  pShExt->bTCoeffLevelPredFlag		= false;  pShExt->uiScanIdxStart				= 0;  pShExt->uiScanIdxEnd				= 15;   return true;} int32_t InitBsBuffer (PWelsDecoderContext pCtx) {  if (pCtx == NULL)    return ERR_INFO_INVALID_PTR;   pCtx->iMaxBsBufferSizeInByte = MIN_ACCESS_UNIT_CAPACITY * MAX_BUFFERED_NUM;  if ((pCtx->sRawData.pHead = static_cast<uint8_t*> (WelsMallocz (pCtx->iMaxBsBufferSizeInByte,                              "pCtx->sRawData.pHead"))) == NULL) {    return ERR_INFO_OUT_OF_MEMORY;  }  pCtx->sRawData.pStartPos = pCtx->sRawData.pCurPos = pCtx->sRawData.pHead;  pCtx->sRawData.pEnd = pCtx->sRawData.pHead + pCtx->iMaxBsBufferSizeInByte;  if (pCtx->bParseOnly) {    pCtx->pParserBsInfo = static_cast<SParserBsInfo*> (WelsMallocz (sizeof (SParserBsInfo), "pCtx->pParserBsInfo"));    if (pCtx->pParserBsInfo == NULL) {      return ERR_INFO_OUT_OF_MEMORY;    }    memset (pCtx->pParserBsInfo, 0, sizeof (SParserBsInfo));    pCtx->pParserBsInfo->pDstBuff = static_cast<uint8_t*> (WelsMallocz (MAX_ACCESS_UNIT_CAPACITY * sizeof (uint8_t),                                    "pCtx->pParserBsInfo->pDstBuff"));    if (pCtx->pParserBsInfo->pDstBuff == NULL) {      return ERR_INFO_OUT_OF_MEMORY;    }    memset (pCtx->pParserBsInfo->pDstBuff, 0, MAX_ACCESS_UNIT_CAPACITY * sizeof (uint8_t));     if ((pCtx->sSavedData.pHead = static_cast<uint8_t*> (WelsMallocz (pCtx->iMaxBsBufferSizeInByte,                                  "pCtx->sSavedData.pHead"))) == NULL) {      return ERR_INFO_OUT_OF_MEMORY;    }    pCtx->sSavedData.pStartPos = pCtx->sSavedData.pCurPos = pCtx->sSavedData.pHead;    pCtx->sSavedData.pEnd = pCtx->sSavedData.pHead + pCtx->iMaxBsBufferSizeInByte;  }  return ERR_NONE;} int32_t ExpandBsBuffer (PWelsDecoderContext pCtx, const int kiSrcLen) {  if (pCtx == NULL)    return ERR_INFO_INVALID_PTR;  int32_t iExpandStepShift = 1;  int32_t iNewBuffLen = WELS_MAX ((kiSrcLen * MAX_BUFFERED_NUM), (pCtx->iMaxBsBufferSizeInByte << iExpandStepShift));  //allocate new bs buffer  uint8_t* pNewBsBuff = static_cast<uint8_t*> (WelsMallocz (iNewBuffLen, "pCtx->sRawData.pHead"));  if (pNewBsBuff == NULL)    return ERR_INFO_OUT_OF_MEMORY;   //Calculate and set the bs start and end position  for (uint32_t i = 0; i <= pCtx->pAccessUnitList->uiActualUnitsNum; i++) {

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