/*! * \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 "mem_align.h" namespace WelsDec { static inline int32_t DecodeFrameConstruction (PWelsDecoderContext pCtx, uint8_t** ppDst, int32_t* pDstLen,    int32_t* pWidth, int32_t* pHeight, 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;   if (pPic->iTotalNumMbRec != kiTotalNumMbInCurLayer) {    WelsLog (pCtx, WELS_LOG_WARNING,             "DecodeFrameConstruction():::iTotalNumMbRec:%d, total_num_mb_sps:%d, cur_layer_mb_width:%d, cur_layer_mb_height:%d \n",             pPic->iTotalNumMbRec, kiTotalNumMbInCurLayer, pCurDq->iMbWidth, pCurDq->iMbHeight);    return -1;  }#ifdef NO_WAITING_AU  pPic->iTotalNumMbRec = 0;#endif   if (I_SLICE == pCurDq->sLayerInfo.sSliceInLayer.eSliceType) {    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 I_SLICE, 6/4/2010#endif //LONG_TERM_REF    WelsLog (pCtx, WELS_LOG_INFO,             "DecodeFrameConstruction()::::output good I frame, %d x %d, crop_left:%d, crop_right:%d, crop_top:%d, crop_bottom:%d.\n",             kiWidth, kiHeight, pCtx->sFrameCrop.iLeftOffset, pCtx->sFrameCrop.iRightOffset, pCtx->sFrameCrop.iTopOffset,             pCtx->sFrameCrop.iBottomOffset);  }   //////output:::normal path  ppDst[0]      = pPic->pData[0];  ppDst[1]      = pPic->pData[1];  ppDst[2]      = pPic->pData[2];  *pDstLen     = pPic->iLinesize[0];  * (pDstLen + 1) = pPic->iLinesize[1];  *pWidth      = kiWidth;  *pHeight     = kiHeight;   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;   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;  }#ifndef LONG_TERM_REF  if (pCtx->bReferenceLostAtT0Flag) {    ResetParameterSetsState (pCtx);  }#endif  pCtx->iErrorCode |= dsBitstreamError;} inline void    HandleReferenceLost (PWelsDecoderContext pCtx, PNalUnit pCurNal) {  if ((0 == pCurNal->sNalHeaderExt.uiTemporalId) || (1 == pCurNal->sNalHeaderExt.uiTemporalId)) {    pCtx->bReferenceLostAtT0Flag = true;  }#ifndef LONG_TERM_REF  if (pCtx->bReferenceLostAtT0Flag) {    ResetParameterSetsState (pCtx);  }#endif  pCtx->iErrorCode |= dsRefLost;} inline int32_t  WelsDecodeConstructSlice (PWelsDecoderContext pCtx, PNalUnit pCurNal) {  int32_t  iRet = WelsTargetSliceConstruction (pCtx);   if (iRet) {    HandleReferenceLostL0 (pCtx, pCurNal);  }   return iRet;} /* *	Predeclared function routines .. */int32_t ParseRefPicListReordering (PBitStringAux pBs, PSliceHeader pSh) {  int32_t iList = 0;  const ESliceType 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, (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;  PRefPic pRefPic = &pCtx->sRefPic;  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;} /* * WelsInitMemory * Memory request for new introduced data * Especially for: * rbsp_au_buffer, cur_dq_layer_ptr and ref_dq_layer_ptr in MB info cache. * return: *	0 - success; otherwise returned error_no defined in error_no.h.*/int32_t WelsInitMemory (PWelsDecoderContext pCtx) {  if (pCtx == NULL) {    return ERR_INFO_INVALID_PTR;  }   if (MemInitNalList (&pCtx->pAccessUnitList, MAX_NAL_UNIT_NUM_IN_AU) != 0)    return ERR_INFO_OUT_OF_MEMORY;   if ((pCtx->sRawData.pHead = static_cast<uint8_t*> (WelsMalloc (MAX_ACCESS_UNIT_CAPACITY,                              "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 + MAX_ACCESS_UNIT_CAPACITY;   pCtx->uiTargetDqId			= (uint8_t) - 1;  pCtx->bEndOfStreamFlag	= false;  pCtx->iImgWidthInPixel	= 0;  pCtx->iImgHeightInPixel	= 0;   return ERR_NONE;} /* * WelsFreeMemory * Free memory introduced in WelsInitMemory at destruction of decoder. * */void WelsFreeMemory (PWelsDecoderContext pCtx) {  if (pCtx == NULL)    return;   if (NULL != pCtx->pParam) {    WelsFree (pCtx->pParam, "pCtx->pParam");     pCtx->pParam = NULL;  }   MemFreeNalList (&pCtx->pAccessUnitList);   if (pCtx->sRawData.pHead) {    WelsFree (pCtx->sRawData.pHead, "pCtx->sRawData->pHead");  }  pCtx->sRawData.pHead                = NULL;  pCtx->sRawData.pEnd                 = NULL;  pCtx->sRawData.pStartPos	        = NULL;  pCtx->sRawData.pCurPos             = NULL;} /* *	DecodeNalHeaderExt *	Trigger condition: NAL_UNIT_TYPE = NAL_UNIT_PREFIX or NAL_UNIT_CODED_SLICE_EXT *	Parameter: *	pNal:	target NALUnit ptr *	pSrc:	NAL Unit bitstream */void DecodeNalHeaderExt (PNalUnit pNal, uint8_t* pSrc) {  PNalUnitHeaderExt pHeaderExt = &pNal->sNalHeaderExt;   uint8_t uiCurByte = *pSrc;  pHeaderExt->bIdrFlag				 = !! (uiCurByte & 0x40);  pHeaderExt->uiPriorityId			 = uiCurByte & 0x3F;   uiCurByte = * (++pSrc);  pHeaderExt->iNoInterLayerPredFlag = uiCurByte >> 7;  pHeaderExt->uiDependencyId			 = (uiCurByte & 0x70) >> 4;  pHeaderExt->uiQualityId				 = uiCurByte & 0x0F;  uiCurByte = * (++pSrc);  pHeaderExt->uiTemporalId			 = uiCurByte >> 5;  pHeaderExt->bUseRefBasePicFlag	     = !! (uiCurByte & 0x10);  pHeaderExt->bDiscardableFlag		 = !! (uiCurByte & 0x08);  pHeaderExt->bOutputFlag				 = !! (uiCurByte & 0x04);  pHeaderExt->uiReservedThree2Bits	 = uiCurByte & 0x03;  pHeaderExt->uiLayerDqId				 = (pHeaderExt->uiDependencyId << 4) | pHeaderExt->uiQualityId;}  #define SLICE_HEADER_IDR_PIC_ID_MAX 65535#define SLICE_HEADER_REDUNDANT_PIC_CNT_MAX 127#define SLICE_HEADER_ALPHAC0_BETA_OFFSET_MIN -12#define SLICE_HEADER_ALPHAC0_BETA_OFFSET_MAX 12#define SLICE_HEADER_INTER_LAYER_ALPHAC0_BETA_OFFSET_MIN -12#define SLICE_HEADER_INTER_LAYER_ALPHAC0_BETA_OFFSET_MAX 12#define MAX_NUM_REF_IDX_L0_ACTIVE_MINUS1 15/* *	decode_slice_header_avc *	Parse slice header of bitstream in avc for storing data structure */int32_t ParseSliceHeaderSyntaxs (PWelsDecoderContext pCtx, PBitStringAux pBs, const bool kbExtensionFlag) {  PNalUnit const kpCurNal				= pCtx->pAccessUnitList->pNalUnitsList[pCtx->pAccessUnitList->uiAvailUnitsNum - 1];   PNalUnitHeaderExt pNalHeaderExt	= NULL;  PSliceHeader pSliceHead			= NULL;  PSliceHeaderExt pSliceHeadExt	= NULL;  PSubsetSps pSubsetSps				= NULL;  PSps pSps							= NULL;  PPps pPps							= NULL;  ENalUnitType eNalType				= static_cast<ENalUnitType> (0);  int32_t iPpsId						= 0;  int32_t iRet						= ERR_NONE;  uint8_t uiSliceType				= 0;  uint8_t uiQualityId					= BASE_QUALITY_ID;  bool	bIdrFlag					= false;  bool	bSgChangeCycleInvolved	= false;	// involved slice group change cycle ?  uint32_t uiCode;  int32_t iCode;   if (kpCurNal == NULL) {    return ERR_INFO_OUT_OF_MEMORY;  }   pNalHeaderExt	= &kpCurNal->sNalHeaderExt;  pSliceHead		= &kpCurNal->sNalData.sVclNal.sSliceHeaderExt.sSliceHeader;  eNalType		= pNalHeaderExt->sNalUnitHeader.eNalUnitType;   pSliceHeadExt	= &kpCurNal->sNalData.sVclNal.sSliceHeaderExt;   if (pSliceHeadExt) {    SRefBasePicMarking sBaseMarking;    const bool kbStoreRefBaseFlag = pSliceHeadExt->bStoreRefBasePicFlag;    memcpy (&sBaseMarking, &pSliceHeadExt->sRefBasePicMarking, sizeof (SRefBasePicMarking)); //confirmed_safe_unsafe_usage    memset (pSliceHeadExt, 0, sizeof (SSliceHeaderExt));    pSliceHeadExt->bStoreRefBasePicFlag	= kbStoreRefBaseFlag;    memcpy (&pSliceHeadExt->sRefBasePicMarking, &sBaseMarking, sizeof (SRefBasePicMarking)); //confirmed_safe_unsafe_usage  }   kpCurNal->sNalData.sVclNal.bSliceHeaderExtFlag	= kbExtensionFlag;   // first_mb_in_slice  WELS_READ_VERIFY (BsGetUe (pBs, &uiCode)); //first_mb_in_slice  pSliceHead->iFirstMbInSlice	= uiCode;   WELS_READ_VERIFY (BsGetUe (pBs, &uiCode)); //slice_type  uiSliceType = uiCode;  if (uiSliceType > 9) {    WelsLog (pCtx, WELS_LOG_WARNING, "slice type too large (%d) at first_mb(%d)\n", uiSliceType,             pSliceHead->iFirstMbInSlice);    return GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_INVALID_SLICE_TYPE);  }  if (uiSliceType > 4)    uiSliceType -= 5;   if ((eNalType == NAL_UNIT_CODED_SLICE_IDR) && (uiSliceType != 2)) {    WelsLog (pCtx, WELS_LOG_WARNING, "Invalid slice type(%d) in IDR picture. \n", uiSliceType);    return GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_INVALID_SLICE_TYPE);  }   if (kbExtensionFlag) {    if (uiSliceType > 2) {      WelsLog (pCtx, WELS_LOG_WARNING, "Invalid slice type(%d).\n", uiSliceType);      return GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_INVALID_SLICE_TYPE);    }  }   pSliceHead->eSliceType	= static_cast <ESliceType> (uiSliceType);   WELS_READ_VERIFY (BsGetUe (pBs, &uiCode)); //pic_parameter_set_id  iPpsId = uiCode;   if (iPpsId >= MAX_PPS_COUNT) {    WelsLog (pCtx, WELS_LOG_WARNING, "iPpsId out of range\n");    return GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_PPS_ID_OVERFLOW);  }   //add check PPS available here   pPps    = &pCtx->sPpsBuffer[iPpsId];   if (pPps->uiNumSliceGroups == 0) {    WelsLog (pCtx, WELS_LOG_WARNING, "non existing PPS referenced\n");    return GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_NO_PARAM_SETS);  }   if (pPps->iSpsId >= MAX_SPS_COUNT) {    WelsLog (pCtx, WELS_LOG_WARNING, "iSpsId out of range\n");    return GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_SPS_ID_OVERFLOW);  }   //add check SPS available here   if (kbExtensionFlag) {    pSubsetSps	= &pCtx->sSubsetSpsBuffer[pPps->iSpsId];    pSps		= &pSubsetSps->sSps;  } else {    pSps		= &pCtx->sSpsBuffer[pPps->iSpsId];  }  pCtx->pSps			= pSps;  pSliceHead->iPpsId = iPpsId;  pSliceHead->iSpsId = pPps->iSpsId;  pSliceHead->pPps   = pPps;  pSliceHead->pSps   = pSps;   pSliceHeadExt->pSubsetSps = pSubsetSps;   bIdrFlag = (!kbExtensionFlag && eNalType == NAL_UNIT_CODED_SLICE_IDR) || (kbExtensionFlag && pNalHeaderExt->bIdrFlag);   if (pSps->uiLog2MaxFrameNum == 0) {    WelsLog (pCtx, WELS_LOG_WARNING, "non existing SPS referenced\n");    return GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_NO_PARAM_SETS);  }  // check first_mb_in_slice  WELS_CHECK_SE_UPPER_ERROR ((uint32_t) (pSliceHead->iFirstMbInSlice), pSps->uiTotalMbCount, "first_mb_in_slice",                             GENERATE_ERROR_NO (ERR_LEVEL_SLICE_HEADER, ERR_INFO_INVALID_FIRST_MB_IN_SLICE));  WELS_READ_VERIFY (BsGetBits (pBs, pSps->uiLog2MaxFrameNum, &uiCode)); //frame_num

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