/* -----------------------------------------------------------------------------

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other Intellectual Property Rights other than the copyrights concerning 

the Software are granted under this license.

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/** \file     DecLib.cpp

    \brief    decoder wrapper class

*/

#include "DecLib.h"

#include "CommonLib/dtrace_next.h"

#include "CommonLib/dtrace_buffer.h"

#include "CommonLib/TimeProfiler.h"

#include "CommonLib/arm/CommonDefARM.h"

#include "CommonLib/x86/CommonDefX86.h"

#include "NALread.h"

namespace vvdec

{

#ifdef TRACE_ENABLE_ITT

std::vector<__itt_domain*> itt_domain_decInst;

__itt_domain* itt_domain_dec           = __itt_domain_create( "Decode" );

__itt_domain* itt_domain_prs           = __itt_domain_create( "Parse" );

__itt_domain* itt_domain_oth           = __itt_domain_create( "Other" );

__itt_string_handle* itt_handle_alf    = __itt_string_handle_create( "ALF_CTU" );

__itt_string_handle* itt_handle_presao = __itt_string_handle_create( "PreSAO_Line" );

__itt_string_handle* itt_handle_sao    = __itt_string_handle_create( "SAO_CTU" );

__itt_string_handle* itt_handle_lfl    = __itt_string_handle_create( "LFL_CTU" );

__itt_string_handle* itt_handle_intra  = __itt_string_handle_create( "Intra_CTU" );

__itt_string_handle* itt_handle_inter  = __itt_string_handle_create( "Inter_CTU" );

__itt_string_handle* itt_handle_mider  = __itt_string_handle_create( "MI-Der_CTU" );

__itt_string_handle* itt_handle_lfcl   = __itt_string_handle_create( "Prep_ClearLF" );

__itt_string_handle* itt_handle_ext    = __itt_string_handle_create( "Prep_ExtBrdr" );

__itt_string_handle* itt_handle_dmvr   = __itt_string_handle_create( "MI-DMVR" );

__itt_string_handle* itt_handle_rsp    = __itt_string_handle_create( "Reshape_CTU" );

__itt_string_handle* itt_handle_parse  = __itt_string_handle_create( "Parse_Slice" );

__itt_string_handle* itt_handle_start  = __itt_string_handle_create( "Start_Pic" );

__itt_string_handle* itt_handle_done   = __itt_string_handle_create( "Pic_Done" );

__itt_string_handle* itt_handle_finish = __itt_string_handle_create( "Finish_Pic" );

__itt_string_handle* itt_handle_schedTasks = __itt_string_handle_create( "Scheduling_Tasks" );

__itt_string_handle* itt_handle_waitTasks  = __itt_string_handle_create( "Wait_for_Dec_Tasks" );

// create global domain for DecLib

__itt_domain* itt_domain_glb    = __itt_domain_create ( "Global" );

// create a global counter

__itt_counter itt_frame_counter = __itt_counter_create( "FrameNumber", "Global" );

#define ITT_TASKSTART( d, t ) __itt_task_begin( ( d ), __itt_null, __itt_null, ( t ) )

#define ITT_TASKEND( d, t )   __itt_task_end  ( ( d ) )

#else

#define ITT_TASKSTART( d, t )

#define ITT_TASKEND( d, t )

#endif

//! \ingroup DecoderLib

//! \{

DecLib::DecLib()

{

#ifdef TRACE_ENABLE_ITT

  itt_domain_dec->flags = 1;

  itt_domain_prs->flags = 1;

  itt_domain_glb->flags = 1;

  itt_domain_oth->flags = 1;

#endif

}

void DecLib::create( int numDecThreads, int parserFrameDelay, const UserAllocator& userAllocator, ErrHandlingFlags errHandlingFlags )

{

  // run constructor again to ensure all variables, especially in DecLibParser have been reset

  this->~DecLib();

  new( this ) DecLib;

  if( numDecThreads < 0 )

  {

    numDecThreads = std::thread::hardware_concurrency();

  }

  m_decodeThreadPool.reset( new ThreadPool( numDecThreads, "DecThread" ) );

  if( parserFrameDelay < 0 )

  {

    CHECK_FATAL( numDecThreads < 0, "invalid number of threads" );

    parserFrameDelay = std::min<int>( ( numDecThreads * DEFAULT_PARSE_DELAY_FACTOR ) >> 4, DEFAULT_PARSE_DELAY_MAX );

  }

  m_parseFrameDelay = parserFrameDelay;

  bool upscalingEnabled = false;

  m_picListManager.create( m_parseFrameDelay, (int) m_decLibRecon.size(), userAllocator );

  m_decLibParser.create  ( m_decodeThreadPool.get(), m_parseFrameDelay, (int) m_decLibRecon.size(), numDecThreads, errHandlingFlags );

  int id=0;

  for( auto &dec: m_decLibRecon )

  {

    dec.create( m_decodeThreadPool.get(), id++, upscalingEnabled );

  }

  std::stringstream cssCap;

  cssCap << "THREADS="     << numDecThreads << "; "

         << "PARSE_DELAY=" << parserFrameDelay << "; ";

#if ENABLE_SIMD_OPT

#  if defined( TARGET_SIMD_ARM )

  cssCap << "SIMD=" << read_arm_extension_name();

#  elif defined( TARGET_SIMD_X86 )

  cssCap << "SIMD=" << read_x86_extension_name();

#  else

  cssCap << "SIMD=SCALAR";

#  endif

#else

  cssCap << "SIMD=NONE";

#endif

  m_sDecoderCapabilities = cssCap.str();

  DTRACE_UPDATE( g_trace_ctx, std::make_pair( "final", 1 ) );

}

void DecLib::destroy()

{

  if( m_decodeThreadPool )

  {

    m_decodeThreadPool->shutdown( true );

    m_decodeThreadPool.reset();

  }

  m_decLibParser.destroy();

  for( auto &dec: m_decLibRecon )

  {

    dec.destroy();

  }

  m_picListManager.deleteBuffers();

}

Picture* DecLib::decode( InputNALUnit& nalu )

{

  PROFILER_SCOPE_AND_STAGE( 1, g_timeProfiler, P_NALU_SLICE_PIC_HL );

  bool newPic = false;

  if( m_iMaxTemporalLayer < 0 || nalu.m_temporalId <= m_iMaxTemporalLayer )

  {

    newPic = m_decLibParser.parse( nalu );

  }

  if( newPic )

  {

    Picture* pcParsedPic = m_decLibParser.getNextDecodablePicture();

    if( pcParsedPic )

    {

      while( pcParsedPic->error || pcParsedPic->wasLost || pcParsedPic->parseDone.hasException() )

      {

        CHECK_FATAL( pcParsedPic->progress >= Picture::reconstructing, "The error picture shouldn't be in reconstructing state yet." );

        std::exception_ptr parsing_exception = pcParsedPic->parseDone.hasException() ? pcParsedPic->parseDone.getException() : nullptr;

        if( parsing_exception )

        {   // the exception has not been thrown out of the library. Do that after preparing this picture for referencing

          pcParsedPic->error = true;

          pcParsedPic->waitForAllTasks();

          pcParsedPic->parseDone.clearException();

        }

        pcParsedPic->waitForAllTasks();

        if( pcParsedPic->progress < Picture::parsing )

        {

          // we don't know if all structures are there yet, so we init them

          pcParsedPic->ensureUsableAsRef();

        }

        pcParsedPic->fillGrey( m_decLibParser.getParameterSetManager().getFirstSPS() );

        // need to finish picture here, because it won't go through declibRecon

        finishPicture( pcParsedPic );

        // this exception has not been thrown outside (error must have happened in slice parsing task)

        if( parsing_exception )

        {

          CHECK_FATAL( pcParsedPic->exceptionThrownOut, "The exception shouldn't have been thrown out already." );

          pcParsedPic->exceptionThrownOut = true;

          std::rethrow_exception( parsing_exception );

        }

        // try again to get a picture, that we can reconstruct now

        pcParsedPic = m_decLibParser.getNextDecodablePicture();

      }

      reconPicture( pcParsedPic );

    }

  }

  if( newPic || nalu.m_nalUnitType == NAL_UNIT_EOS )

  {

    Picture* outPic = getNextOutputPic( false );

    if( outPic )

    {

      CHECK_WARN( outPic->progress < Picture::finished, "Picture should have been finished by now. Blocking and finishing..." );

      if( outPic->progress < Picture::finished )

      {

        blockAndFinishPictures( outPic );

        CHECK( outPic->progress < Picture::finished, "Picture still not finished. Something is really broken." );

      }

      m_checkMissingOutput = true;

    }

    // warn if we don't produce an output picture for every incoming picture

    CHECK_WARN( m_checkMissingOutput && !outPic, "missing output picture" ); // this CHECK_FATAL is not needed in flushPic(), because in flushPic() the nullptr signals the end of the bitstream

    return outPic;

  }

  return nullptr;

}

Picture* DecLib::flushPic()

{

  Picture* outPic = getNextOutputPic( false );

  try

  {

    // at end of file, fill the decompression queue and decode pictures until the next output-picture is finished

    while( Picture* pcParsedPic = m_decLibParser.getNextDecodablePicture() )

    {

      // reconPicture() blocks and finishes one picture on each call

      reconPicture( pcParsedPic );

      if( !outPic )

      {

        outPic = getNextOutputPic( false );

      }

      if( outPic && outPic->progress == Picture::finished )

      {

        return outPic;

      }

    }

    if( outPic && outPic->progress == Picture::finished )

    {

      return outPic;

    }

    // if all pictures have been parsed, but not finished, iteratively wait for and finish next pictures

    blockAndFinishPictures( outPic );

    if( !outPic )

    {

      outPic = getNextOutputPic( false );

    }

    if( outPic && outPic->progress == Picture::finished )

    {

      return outPic;

    }

    CHECK( outPic, "we shouldn't be holding an output picture here" );

    // flush remaining pictures without considering num reorder pics

    outPic = getNextOutputPic( true );

    if( outPic )

    {

      CHECK( outPic->progress != Picture::finished, "all pictures should have been finished by now" );

      // outPic->referenced = false;

      return outPic;

    }

  }

  catch( ... )

  {

    m_picListManager.releasePicture(outPic);

    throw;

  }

  // At the very end reset parser state

  InputNALUnit eosNAL;

  eosNAL.m_nalUnitType = NAL_UNIT_EOS;

  m_decLibParser.parse( eosNAL );

  m_checkMissingOutput = false;

  return nullptr;

}

#if JVET_R0270

int DecLib::finishPicture( Picture* pcPic, MsgLevel msgl, bool associatedWithNewClvs )

#else

int DecLib::finishPicture( Picture* pcPic, MsgLevel msgl )

#endif

{

#ifdef TRACE_ENABLE_ITT

  // increment Framecounter

  __itt_counter_inc( itt_frame_counter );

#endif

  Slice*  pcSlice = pcPic->slices[0];

  if( pcPic->wasLost || pcPic->error || pcPic->reconDone.hasException() || pcPic->parseDone.hasException() )

  {

    msg( msgl, "POC %4d LId: %2d TId: %1d %s\n", pcPic->poc, pcPic->layerId, pcSlice->getTLayer(), pcPic->wasLost ? "LOST" : "ERROR" );

    pcPic->progress = Picture::finished;

    // if the picture has an exception set (originating from thread-pool tasks), don't return here, but rethrow the exception

    try

    {

      pcPic->parseDone.checkAndRethrowException();

      pcPic->reconDone.checkAndRethrowException();

    }

    catch( ... )

    {

      pcPic->waitForAllTasks();

      // need to clear exception so we can use it as reference picture

      pcPic->reconDone.clearException();

      pcPic->reconDone.unlock();

      pcPic->error = true;

      if( !pcPic->exceptionThrownOut )

      {

        pcPic->exceptionThrownOut = true;

        throw;

      }

    }

    return pcPic->poc;

  }

  ITT_TASKSTART( itt_domain_oth, itt_handle_finish );

  char c = ( pcSlice->isIntra() ? 'I' : pcSlice->isInterP() ? 'P' : 'B' );

  if( !pcPic->isReferencePic )

  {

    c += 32;  // tolower

  }

  //-- For time output for each slice

  msg( msgl, "POC %4d LId: %2d TId: %1d ( %c-SLICE, QP%3d ) ", pcPic->poc, pcPic->layerId,

         pcSlice->getTLayer(),

         c,

         pcSlice->getSliceQp() );

  msg( msgl, "[DT %6.3f] ", pcPic->getProcessingTime() );

  for (int iRefList = 0; iRefList < 2; iRefList++)

  {

    msg( msgl, "[L%d ", iRefList);

    for (int iRefIndex = 0; iRefIndex < pcSlice->getNumRefIdx(RefPicList(iRefList)); iRefIndex++)

    {

#if RPR_OUTPUT_MSG

      const std::pair<int, int>& scaleRatio = pcSlice->getScalingRatio( RefPicList( iRefList ), iRefIndex );

      if( pcSlice->getPicHeader()->getEnableTMVPFlag() && pcSlice->getColFromL0Flag() == bool(1 - iRefList) && pcSlice->getColRefIdx() == iRefIndex )

      {

        if( scaleRatio.first != 1 << SCALE_RATIO_BITS || scaleRatio.second != 1 << SCALE_RATIO_BITS )

        {

          msg( msgl, "%dc(%1.2lfx, %1.2lfx) ", pcSlice->getRefPOC( RefPicList( iRefList ), iRefIndex ), double( scaleRatio.first ) / ( 1 << SCALE_RATIO_BITS ), double( scaleRatio.second ) / ( 1 << SCALE_RATIO_BITS ) );

        }

        else

        {

          msg( msgl, "%dc ", pcSlice->getRefPOC( RefPicList( iRefList ), iRefIndex ) );

        }

      }

      else

      {

        if( scaleRatio.first != 1 << SCALE_RATIO_BITS || scaleRatio.second != 1 << SCALE_RATIO_BITS )

        {

          msg( msgl, "%d(%1.2lfx, %1.2lfx) ", pcSlice->getRefPOC( RefPicList( iRefList ), iRefIndex ), double( scaleRatio.first ) / ( 1 << SCALE_RATIO_BITS ), double( scaleRatio.second ) / ( 1 << SCALE_RATIO_BITS ) );

        }

        else

        {

      msg( msgl, "%d ", pcSlice->getRefPOC(RefPicList(iRefList), iRefIndex));

    }

      }

#else

      msg( msgl, "%d ", pcSlice->getRefPOC(RefPicList(iRefList), iRefIndex));

#endif

    }

    msg( msgl, "] ");

  }

  msg( msgl, "\n");

//  pcPic->neededForOutput = (pcSlice->getPicHeader()->getPicOutputFlag() ? true : false);

#if JVET_R0270

  if (associatedWithNewClvs && pcPic->neededForOutput)

  {

    if (!pcSlice->getPPS()->getMixedNaluTypesInPicFlag() && pcSlice->getNalUnitType() == NAL_UNIT_CODED_SLICE_RASL)

    {

      pcPic->neededForOutput = false;

    }

    else if (pcSlice->getPPS()->getMixedNaluTypesInPicFlag())

    {

      bool isRaslPic = true;

      for (int i = 0; isRaslPic && i < pcPic->numSlices; i++)

      {

        if (!(pcSlice->getNalUnitType() == NAL_UNIT_CODED_SLICE_RASL || pcSlice->getNalUnitType() == NAL_UNIT_CODED_SLICE_RADL))

        {

          isRaslPic = false;

        }

      }

      if (isRaslPic)

      {

        pcPic->neededForOutput = false;

      }

    }

  }

#endif

  m_picListManager.markUnusedPicturesReusable();

  if( m_parseFrameDelay > 0 )

  {

    checkPictureHashSEI( pcPic );

  }

  ITT_TASKEND( itt_domain_oth, itt_handle_finish );

  pcPic->progress = Picture::finished;

  return pcSlice->getPOC();

}

void DecLib::checkPictureHashSEI( Picture* pcPic )

{

  if( !m_decodedPictureHashSEIEnabled )

  {

    return;

  }

  if( !pcPic->neededForOutput || pcPic->picCheckedDPH )

  {

    return;

  }

  CHECK( pcPic->progress < Picture::reconstructed, "picture not reconstructed" );

  seiMessages pictureHashes = SEI_internal::getSeisByType( pcPic->seiMessageList, VVDEC_DECODED_PICTURE_HASH );

  if( !pictureHashes.empty() )

  {

    if( pictureHashes.size() > 1 )

    {

      msg( WARNING, "Warning: Got multiple decoded picture hash SEI messages. Using first." );

    }

    const vvdecSEIDecodedPictureHash* hash = (vvdecSEIDecodedPictureHash*)pictureHashes.front()->payload;

    msg( INFO, "         " );

    const int hashErrors              = calcAndPrintHashStatus( pcPic->getRecoBuf(), hash, pcPic->cs->sps->getBitDepths(), INFO );

    m_numberOfChecksumErrorsDetected += hashErrors;

    pcPic->dphMismatch                = !!hashErrors;

    pcPic->picCheckedDPH              = true;

    msg( INFO, "\n" );

  }

  else

  {

    if( pcPic->subPictures.empty() )

    {

      msg( WARNING, "Warning: missing decoded picture hash SEI message.\n" );

      return;

    }

    seiMessages scalableNestingSeis = SEI_internal::getSeisByType( pcPic->seiMessageList, VVDEC_SCALABLE_NESTING );

    for( auto* seiIt: scalableNestingSeis )

    {

      CHECK( seiIt->payloadType != VVDEC_SCALABLE_NESTING, "expected nesting SEI" );

      const vvdecSEIScalableNesting* nestingSei = (vvdecSEIScalableNesting*) seiIt->payload;

      if( !nestingSei->snSubpicFlag )

      {

        continue;

      }

      for( int i = 0; i < nestingSei->snNumSEIs; ++i )

      {

        auto& nestedSei = nestingSei->nestedSEIs[i];

        CHECK( nestedSei == nullptr, "missing nested sei" );

        if( nestedSei && nestedSei->payloadType != VVDEC_DECODED_PICTURE_HASH )

          continue;

        const vvdecSEIDecodedPictureHash* hash = (vvdecSEIDecodedPictureHash*) nestedSei->payload;

        if( pcPic->subpicsCheckedDPH.empty() )

        {

          pcPic->subpicsCheckedDPH.resize( pcPic->subPictures.size(), false );

        }

        else

        {

          CHECK( pcPic->subpicsCheckedDPH.size() != pcPic->subPictures.size(), "Picture::subpicsCheckedDPH not properly initialized" );

        }

        for( int j = 0; j < nestingSei->snNumSubpics; ++j )

        {

          uint32_t subpicId = nestingSei->snSubpicId[j];

          for( auto& subPic: pcPic->subPictures )

          {

            if( subPic.getSubPicID() != subpicId )

              continue;

            auto subPicIdx = subPic.getSubPicIdx();

            if( pcPic->subpicsCheckedDPH[subPicIdx] )

              continue;

            const UnitArea area                 = UnitArea( pcPic->chromaFormat, subPic.getLumaArea() );

            const int      hashErrors           = calcAndPrintHashStatus( pcPic->cs->getRecoBuf( area ), hash, pcPic->cs->sps->getBitDepths(), INFO );

            m_numberOfChecksumErrorsDetected   += hashErrors;

            pcPic->dphMismatch                 |= !!hashErrors;

            pcPic->subpicsCheckedDPH[subPicIdx] = true;

            msg( INFO, "\n" );

          }

        }

      }

    }

    size_t checkedSubpicCount = std::count( pcPic->subpicsCheckedDPH.cbegin(), pcPic->subpicsCheckedDPH.cend(), true );

    pcPic->picCheckedDPH      = ( checkedSubpicCount == pcPic->subPictures.size() );   // mark when all subpics have been checked

    if( m_parseFrameDelay )

    {

      // this warning is only enabled, when running with parse delay enabled, because otherwise we don't know here if the last DPH Suffix-SEI has already been

      // parsed

      if( checkedSubpicCount != pcPic->subPictures.size() )

      {

        msg( WARNING, "Warning: missing decoded picture hash SEI message for SubPics (%u/%u).\n", checkedSubpicCount, pcPic->subPictures.size() );

      }

    }

  }

}

Picture* DecLib::getNextOutputPic( bool bFlush )

{

  if( m_picListManager.getFrontPic() == nullptr )

  {

    return nullptr;

  }

  const SPS* activeSPS      = m_picListManager.getFrontPic()->cs->sps.get();

  const int  maxNrSublayers = activeSPS->getMaxTLayers();

  int numReorderPicsHighestTid;

  int maxDecPicBufferingHighestTid;

  if( m_iMaxTemporalLayer == -1 || m_iMaxTemporalLayer >= maxNrSublayers )

  {

    numReorderPicsHighestTid     = activeSPS->getNumReorderPics( maxNrSublayers - 1 );

    maxDecPicBufferingHighestTid = activeSPS->getMaxDecPicBuffering( maxNrSublayers - 1 );

  }

  else

  {

    numReorderPicsHighestTid     = activeSPS->getNumReorderPics( m_iMaxTemporalLayer );

    maxDecPicBufferingHighestTid = activeSPS->getMaxDecPicBuffering( m_iMaxTemporalLayer );

  }

  return m_picListManager.getNextOutputPic( numReorderPicsHighestTid, maxDecPicBufferingHighestTid, bFlush );

}

void DecLib::reconPicture( Picture* pcPic )

{

  CHECK_FATAL( std::any_of( m_decLibRecon.begin(), m_decLibRecon.end(), [=]( auto& rec ) { return rec.getCurrPic() == pcPic; } ),

         "(Reused) Picture structure is still in progress in decLibRecon." );

  DecLibRecon* reconInstance = &m_decLibRecon.front();

  move_to_end( m_decLibRecon.begin(), m_decLibRecon );

  Picture* donePic = reconInstance->waitForPrevDecompressedPic();

  try

  {

    reconInstance->decompressPicture( pcPic );

  }

  catch( ... )

  {

    pcPic->reconDone.setException( std::current_exception() );

    pcPic->error = true;

  }

  if( donePic )

  {

    finishPicture( donePic );

  }

}

void DecLib::blockAndFinishPictures( Picture* pcPic )

{

  // find Recon instance where current picture (if not null) is active and ensure the picture gets finished

  // otherwise all pictures get finished

  for( auto& recon: m_decLibRecon )

  {

    if( pcPic && recon.getCurrPic() != pcPic )

    {

      continue;

    }

    if( Picture* donePic = recon.waitForPrevDecompressedPic() )

    {

      finishPicture( donePic );

    }

  }

}

void DecLib::checkNalUnitConstraints( uint32_t naluType )

{

  const ConstraintInfo *cInfo = NULL;

  if (m_decLibParser.getParameterSetManager().getActiveSPS() != NULL && m_decLibParser.getParameterSetManager().getActiveSPS()->getProfileTierLevel() != NULL)

  {

    cInfo = m_decLibParser.getParameterSetManager().getActiveSPS()->getProfileTierLevel()->getConstraintInfo();

    if( cInfo != NULL )

    {

      xCheckNalUnitConstraintFlags( cInfo, naluType );

    }

  }

}

void DecLib::xCheckNalUnitConstraintFlags( const ConstraintInfo *cInfo, uint32_t naluType )

{

  if( cInfo != NULL )

  {

    CHECK( cInfo->getNoTrailConstraintFlag() && naluType == NAL_UNIT_CODED_SLICE_TRAIL,

           "Non-conforming bitstream. no_trail_constraint_flag is equal to 1 but bitstream contains NAL unit of type TRAIL_NUT." );

    CHECK( cInfo->getNoStsaConstraintFlag()  && naluType == NAL_UNIT_CODED_SLICE_STSA,

           "Non-conforming bitstream. no_stsa_constraint_flag is equal to 1 but bitstream contains NAL unit of type STSA_NUT." );

    CHECK( cInfo->getNoRaslConstraintFlag()  && naluType == NAL_UNIT_CODED_SLICE_RASL,

           "Non-conforming bitstream. no_rasl_constraint_flag is equal to 1 but bitstream contains NAL unit of type RASL_NUT." );

    CHECK( cInfo->getNoRadlConstraintFlag()  && naluType == NAL_UNIT_CODED_SLICE_RADL,

           "Non-conforming bitstream. no_radl_constraint_flag is equal to 1 but bitstream contains NAL unit of type RADL_NUT." );

    CHECK( cInfo->getNoIdrConstraintFlag()   && naluType == NAL_UNIT_CODED_SLICE_IDR_W_RADL,

           "Non-conforming bitstream. no_idr_constraint_flag is equal to 1 but bitstream contains NAL unit of type IDR_W_RADL." );

    CHECK( cInfo->getNoIdrConstraintFlag()   && naluType == NAL_UNIT_CODED_SLICE_IDR_N_LP,

           "Non-conforming bitstream. no_idr_constraint_flag is equal to 1 but bitstream contains NAL unit of type IDR_N_LP." );

    CHECK( cInfo->getNoCraConstraintFlag()   && naluType == NAL_UNIT_CODED_SLICE_CRA,

           "Non-conforming bitstream. no_cra_constraint_flag is equal to 1 but bitstream contains NAL unit of type CRA_NUT." );

    CHECK( cInfo->getNoGdrConstraintFlag()   && naluType == NAL_UNIT_CODED_SLICE_GDR,

           "Non-conforming bitstream. no_gdr_constraint_flag is equal to 1 but bitstream contains NAL unit of type GDR_NUT." );

    CHECK( cInfo->getNoApsConstraintFlag()   && naluType == NAL_UNIT_PREFIX_APS,

           "Non-conforming bitstream. no_aps_constraint_flag is equal to 1 but bitstream contains NAL unit of type APS_PREFIX_NUT." );

    CHECK( cInfo->getNoApsConstraintFlag()   && naluType == NAL_UNIT_SUFFIX_APS,

           "Non-conforming bitstream. no_aps_constraint_flag is equal to 1 but bitstream contains NAL unit of type APS_SUFFIX_NUT." );

  }

}

#define SEI_REPETITION_CONSTRAINT_LIST_SIZE  21

/**

 - Count the number of identical SEI messages in the current picture

 */

void DecLib::checkSeiInPictureUnit()

{

  std::vector<std::tuple<int, uint32_t, uint8_t*>> seiList;

  // payload types subject to constrained SEI repetition

  int picUnitRepConSeiList[SEI_REPETITION_CONSTRAINT_LIST_SIZE] = { 0, 1, 19, 45, 129, 132, 133, 137, 144, 145, 147, 148, 149, 150, 153, 154, 155, 156, 168, 203, 204};

  // extract SEI messages from NAL units

  for( auto &sei : m_pictureSeiNalus )

  {

    InputBitstream bs = sei.getBitstream();

    do

    {

      int payloadType = 0;

      uint32_t val = 0;

      do

      {

        val = bs.readByte();

        payloadType += val;

      } while (val==0xFF);

      uint32_t payloadSize = 0;

      do

      {

        val = bs.readByte();

        payloadSize += val;

      } while (val==0xFF);

      uint8_t *payload = new uint8_t[payloadSize];

      for( uint32_t i = 0; i < payloadSize; i++ )

      {

        val = bs.readByte();

        payload[i] = (uint8_t)val;

      }

      seiList.push_back(std::tuple<int, uint32_t, uint8_t*>(payloadType, payloadSize, payload));

    }

    while( bs.getNumBitsLeft() > 8 );

  }

  // count repeated messages in list

  for( uint32_t i = 0; i < seiList.size(); i++ )

  {

    int      k, count = 1;

    int      payloadType1 = std::get<0>(seiList[i]);

    uint32_t payloadSize1 = std::get<1>(seiList[i]);

    uint8_t  *payload1    = std::get<2>(seiList[i]);

    // only consider SEI payload types in the PicUnitRepConSeiList

    for( k=0; k<SEI_REPETITION_CONSTRAINT_LIST_SIZE; k++ )

    {

      if( payloadType1 == picUnitRepConSeiList[k] )

      {

        break;

      }

    }

    if( k >= SEI_REPETITION_CONSTRAINT_LIST_SIZE )

    {

      continue;

    }

    // compare current SEI message with remaining messages in the list

    for( uint32_t j = i+1; j < seiList.size(); j++ )

    {

      int      payloadType2 = std::get<0>(seiList[j]);

      uint32_t payloadSize2 = std::get<1>(seiList[j]);

      uint8_t  *payload2    = std::get<2>(seiList[j]);

      // check for identical SEI type, size, and payload

      if( payloadType1 == payloadType2 && payloadSize1 == payloadSize2 )

      {

        if( memcmp(payload1, payload2, payloadSize1*sizeof(uint8_t)) == 0 )

        {

          count++;

        }

      }

    }

    CHECK(count > 4, "There shall be less than or equal to 4 identical sei_payload( ) syntax structures within a picture unit.");

  }

  // free SEI message list memory

  for( uint32_t i = 0; i < seiList.size(); i++ )

  {

    uint8_t *payload = std::get<2>(seiList[i]);

    delete   payload;

  }

  seiList.clear();

}

/**

 - Reset list of SEI NAL units from the current picture

 */

void DecLib::resetPictureSeiNalus()

{

  m_pictureSeiNalus.clear();

}

void DecLib::checkAPSInPictureUnit()

{

  bool firstVCLFound = false;

  bool suffixAPSFound = false;

  for (auto &nalu : m_pictureUnitNals)

  {

    if (NALUnit::isVclNalUnitType(nalu))

    {

      firstVCLFound = true;

      CHECK( suffixAPSFound, "When any suffix APS NAL units are present in a PU, they shall follow the last VCL unit of the PU" );

    }

    else if (nalu == NAL_UNIT_PREFIX_APS)

    {

      CHECK( firstVCLFound, "When any prefix APS NAL units are present in a PU, they shall precede the first VCL unit of the PU");

    }

    else if (nalu == NAL_UNIT_SUFFIX_APS)

    {

      suffixAPSFound = true;

    }

  }

}

}