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

The copyright in this software is being made available under the Clear BSD

License, included below. No patent rights, trademark rights and/or 

other Intellectual Property Rights other than the copyrights concerning 

the Software are granted under this license.

The Clear BSD License

Copyright (c) 2018-2026, Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. & The VVdeC Authors.

All rights reserved.

Redistribution and use in source and binary forms, with or without modification,

are permitted (subject to the limitations in the disclaimer below) 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.

     * Neither the name of the copyright holder nor the names of its

     contributors may be used to endorse or promote products derived from this

     software without specific prior written permission.

NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY

THIS LICENSE. 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.

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

/** \file     DecLibRecon.cpp

    \brief    decoder class

*/

#include "DecLib.h"

#include "CommonLib/TrQuant.h"

#if ENABLE_SIMD_TCOEFF_OPS

#include "CommonLib/TrQuant_EMT.h"

#endif

#include "CommonLib/InterPrediction.h"

#include "CommonLib/IntraPrediction.h"

#include "CommonLib/Unit.h"

#include "CommonLib/Buffer.h"

#include "CommonLib/UnitTools.h"

#include "CommonLib/dtrace_next.h"

#include "CommonLib/dtrace_buffer.h"

namespace vvdec

{

#ifdef TRACE_ENABLE_ITT

extern __itt_domain*              itt_domain_dec;

extern std::vector<__itt_domain*> itt_domain_decInst;

extern __itt_string_handle* itt_handle_alf;

extern __itt_string_handle* itt_handle_presao;

extern __itt_string_handle* itt_handle_sao;

extern __itt_string_handle* itt_handle_lfl;

extern __itt_string_handle* itt_handle_intra;

extern __itt_string_handle* itt_handle_inter;

extern __itt_string_handle* itt_handle_mider;

extern __itt_string_handle* itt_handle_lfcl;

extern __itt_string_handle* itt_handle_ext;

extern __itt_string_handle* itt_handle_dmvr;

extern __itt_string_handle* itt_handle_rsp;

extern __itt_string_handle* itt_handle_schedTasks;

extern __itt_string_handle* itt_handle_waitTasks;

// create global domain for DecLib

extern __itt_domain* itt_domain_glb;

// create a global counter

extern __itt_counter itt_frame_counter;

#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

//! \{

void CommonTaskParam::reset( CodingStructure& cs, TaskType ctuStartState, int tasksPerLine, bool _doALF )

{

  this->cs = &cs;

  const int heightInCtus = cs.pcv->heightInCtus;

  CHECKD( !ctuStates.empty() && std::any_of( ctuStates.begin(), ctuStates.end(), []( CtuState& s ) { return s != DONE; } ), "some CTUs of previous pic not done" );

  ctuStates = std::vector<CtuState>( heightInCtus * tasksPerLine );

  for( auto& ctu: ctuStates )

  {

    ctu.store( ctuStartState );

  }

  perLineMiHist = std::vector<MotionHist>( heightInCtus );

  doALF         = _doALF;

}

DecLibRecon::DecLibRecon()

{

#if ENABLE_SIMD_OPT_BUFFER

#  if defined( TARGET_SIMD_X86 )

  g_pelBufOP.initPelBufOpsX86();

#  endif

#  if defined( TARGET_SIMD_ARM )

  g_pelBufOP.initPelBufOpsARM();

#  endif

#endif

#if ENABLE_SIMD_TCOEFF_OPS && defined( TARGET_SIMD_X86 )

  g_tCoeffOps.initTCoeffOpsX86();

#endif

#if ENABLE_SIMD_TCOEFF_OPS && defined( TARGET_SIMD_ARM )

  g_tCoeffOps.initTCoeffOpsARM();

#endif

}

void DecLibRecon::create( ThreadPool* threadPool, unsigned instanceId, bool upscaleOutputEnabled )

{

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

  this->~DecLibRecon();

  new( this ) DecLibRecon;

#if TRACE_ENABLE_ITT

  if( itt_domain_decInst.size() < instanceId + 1 )

  {

    std::string name( "DecLibRecon " + std::to_string( instanceId ) );

    itt_domain_decInst.push_back( __itt_domain_create( name.c_str() ) );

    itt_domain_decInst.back()->flags = 1;

    CHECK_FATAL( itt_domain_decInst.back() != itt_domain_decInst[instanceId], "current decLibRecon ITT-Domain is not the last in vector. Instances created in the wrong order?" );

  }

  m_itt_decInst = itt_domain_decInst[instanceId];

#endif

  m_decodeThreadPool = threadPool;

  m_numDecThreads    = std::max( 1, threadPool ? threadPool->numThreads() : 1 );

  m_upscaleOutputEnabled = upscaleOutputEnabled;

  m_predBufSize     = 0;

  m_dmvrMvCacheSize = 0;

  m_dmvrMvCache     = nullptr;

  m_num4x4Elements   = 0;

  m_loopFilterParam  = nullptr;

  m_motionInfo       = nullptr;

  m_pcThreadResource    = new PerThreadResource*[m_numDecThreads];

  m_pcThreadResource[0] = new PerThreadResource();

  for( int i = 1; i < m_numDecThreads; i++ )

  {

    m_pcThreadResource[i] = new PerThreadResource( m_pcThreadResource[0]->m_cTrQuant );

  }

}

void DecLibRecon::destroy()

{

  m_decodeThreadPool = nullptr;

  if( m_predBuf )

  {

    m_predBuf.reset();

    m_predBufSize = 0;

  }

  if( m_dmvrMvCache )

  {

    free( m_dmvrMvCache );

    m_dmvrMvCache = nullptr;

    m_dmvrMvCacheSize = 0;

  }

  if( m_loopFilterParam )

  {

    free( m_loopFilterParam );

    m_loopFilterParam = nullptr;

  }

  if( m_motionInfo )

  {

    free( m_motionInfo );

    m_motionInfo = nullptr;

  }

  m_num4x4Elements = 0;

  for( int i = 0; i < m_numDecThreads; i++ ) delete m_pcThreadResource[i];

  delete[] m_pcThreadResource; m_pcThreadResource = nullptr;

}

static void getCompatibleBuffer( const CodingStructure& cs, const CPelUnitBuf& srcBuf, PelStorage& destBuf, const UserAllocator* userAllocator )

{

  if( !destBuf.bufs.empty() )

  {

    bool compat = false;

    if( destBuf.chromaFormat == srcBuf.chromaFormat )

    {

      compat = true;

      const uint32_t numCh = getNumberValidComponents( srcBuf.chromaFormat );

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

      {

        // check this otherwise it would turn out to get very weird

        compat &= destBuf.get( ComponentID( i ) )         == srcBuf.get( ComponentID( i ) );

        compat &= destBuf.get( ComponentID( i ) ).stride  == srcBuf.get( ComponentID( i ) ).stride;

        compat &= destBuf.get( ComponentID( i ) ).width   == srcBuf.get( ComponentID( i ) ).width;

        compat &= destBuf.get( ComponentID( i ) ).height  == srcBuf.get( ComponentID( i ) ).height;

      }

    }

    if( !compat )

    {

      destBuf.destroy();

    }

  }

  if( destBuf.bufs.empty() )

  {

    destBuf.create( cs.picture->chromaFormat, cs.picture->lumaSize(), cs.pcv->maxCUWidth, cs.picture->margin, MEMORY_ALIGN_DEF_SIZE, true, userAllocator );

  }

}

void DecLibRecon::borderExtPic( Picture* pic, const Picture* currPic )

{

  // we block and wait here, so the exceptions from the reference pic don't propagate to the current picture

  pic->waitForAllTasks();

  if( pic->progress < Picture::reconstructed )   // an exception must have happended in the picture, so we need to clean it up

  {

    CHECK_FATAL( pic->progress < Picture::parsing, "Slice parsing should have started, so all structures are there" );

    try

    {

      pic->reconDone.checkAndRethrowException();

      pic->parseDone.checkAndRethrowException();  // when the error happened in the slice parsing tasks, there might not be an exception in recon done, so check parseDone also

    }

    catch( ... )

    {

      pic->error = true;

      pic->reconDone.clearException();

      // TODO: for now we set it on parseDone, so we can handle it outside:

      if( !pic->parseDone.hasException() )

      {

        pic->parseDone.setException( std::current_exception() );

      }

      pic->fillGrey( currPic->cs->sps.get() );

    }

  }

  pic->borderExtStarted = true;

  const bool wrapAround = pic->cs->sps->getUseWrapAround();

  if( wrapAround )

  {

    // copy reconstruction buffer to wrapAround buffer. All other border-extension tasks depend on this task.

    static auto copyTask = []( int, void* task_param )

    {

      ITT_TASKSTART( itt_domain_dec, itt_handle_ext );

      Picture* picture = static_cast<Picture*>( task_param );

      picture->getRecoBuf( true ).copyFrom( picture->getRecoBuf() );

      ITT_TASKEND( itt_domain_dec, itt_handle_ext );

      return true;

    };

    pic->m_copyWrapBufDone.lock();

    m_decodeThreadPool->addBarrierTask( TP_TASK_NAME_ARG( "POC:" + std::to_string( currPic->poc ) + " copyTask Ref-POC:" + std::to_string( pic->poc ) )

                                        copyTask,

                                        pic,

                                        &pic->m_borderExtTaskCounter,

                                        &pic->m_copyWrapBufDone,

                                        { &pic->reconDone } );

  }

  // start actual border extension tasks

  {

    static auto task = []( int, void* task_param )

    {

      ITT_TASKSTART( itt_domain_dec, itt_handle_ext );

      Picture* picture = static_cast<Picture*>( task_param );

      picture->extendPicBorder( true, false, false, false );

      ITT_TASKEND( itt_domain_dec, itt_handle_ext );

      return true;

    };

    m_decodeThreadPool->addBarrierTask( TP_TASK_NAME_ARG( "POC:" + std::to_string(currPic->poc) + " borderExtTask T Ref-POC:" + std::to_string(pic->poc) )

                                        task,

                                        pic,

                                        &pic->m_borderExtTaskCounter,

                                        nullptr,

                                        { wrapAround ? &pic->m_copyWrapBufDone : &pic->reconDone } );

  }

  {

    static auto task = []( int, void* task_param )

    {

      ITT_TASKSTART( itt_domain_dec, itt_handle_ext );

      Picture* picture = static_cast<Picture*>( task_param );

      picture->extendPicBorder( false, true, false, false );

      ITT_TASKEND( itt_domain_dec, itt_handle_ext );

      return true;

    };

    m_decodeThreadPool->addBarrierTask( TP_TASK_NAME_ARG( "POC:" + std::to_string(currPic->poc) + " borderExtTask B Ref-POC:" + std::to_string(pic->poc) )

                                        task,

                                        pic,

                                        &pic->m_borderExtTaskCounter,

                                        nullptr,

                                        { wrapAround ? &pic->m_copyWrapBufDone : &pic->reconDone } );

  }

  {

    static auto task = []( int, void* task_param )

    {

      ITT_TASKSTART( itt_domain_dec, itt_handle_ext );

      Picture* picture = static_cast<Picture*>( task_param );

      picture->extendPicBorder( false, false, true, false, CH_L );

      ITT_TASKEND( itt_domain_dec, itt_handle_ext );

      return true;

    };

    m_decodeThreadPool->addBarrierTask( TP_TASK_NAME_ARG( "POC:" + std::to_string(currPic->poc) + " borderExtTask ltT Ref-POC:" + std::to_string(pic->poc) )

                                        task,

                                        pic,

                                        &pic->m_borderExtTaskCounter,

                                        nullptr,

                                        { wrapAround ? &pic->m_copyWrapBufDone : &pic->reconDone } );

  }

  {

    static auto task = []( int, void* task_param )

    {

      ITT_TASKSTART( itt_domain_dec, itt_handle_ext );

      Picture* picture = static_cast<Picture*>( task_param );

      picture->extendPicBorder( false, false, false, true, CH_L );

      ITT_TASKEND( itt_domain_dec, itt_handle_ext );

      return true;

    };

    m_decodeThreadPool->addBarrierTask( TP_TASK_NAME_ARG( "POC:" + std::to_string(currPic->poc) + " borderExtTask lrB Y Ref-POC:" + std::to_string(pic->poc) )

                                        task,

                                        pic,

                                        &pic->m_borderExtTaskCounter,

                                        nullptr,

                                        { wrapAround ? &pic->m_copyWrapBufDone : &pic->reconDone } );

  }

  {

    static auto task = []( int, void* task_param )

    {

      ITT_TASKSTART( itt_domain_dec, itt_handle_ext );

      Picture* picture = static_cast<Picture*>( task_param );

      picture->extendPicBorder( false, false, true, false, CH_C );

      ITT_TASKEND( itt_domain_dec, itt_handle_ext );

      return true;

    };

    m_decodeThreadPool->addBarrierTask( TP_TASK_NAME_ARG( "POC:" + std::to_string(currPic->poc) + " borderExtTask lrB UV Ref-POC:" + std::to_string(pic->poc) )

                                        task,

                                        pic,

                                        &pic->m_borderExtTaskCounter,

                                        nullptr,

                                        { wrapAround ? &pic->m_copyWrapBufDone : &pic->reconDone } );

  }

  {

    static auto task = []( int, void* task_param )

    {

      ITT_TASKSTART( itt_domain_dec, itt_handle_ext );

      Picture* picture = static_cast<Picture*>( task_param );

      picture->extendPicBorder( false, false, false, true, CH_C );

      ITT_TASKEND( itt_domain_dec, itt_handle_ext );

      return true;

    };

    m_decodeThreadPool->addBarrierTask( TP_TASK_NAME_ARG( "POC:" + std::to_string(currPic->poc) + " borderExtTask lrB UV Ref-POC:" + std::to_string(pic->poc) )

                                        task,

                                        pic,

                                        &pic->m_borderExtTaskCounter,

                                        nullptr,

                                        { wrapAround ? &pic->m_copyWrapBufDone : &pic->reconDone } );

  }

}

void DecLibRecon::createSubPicRefBufs( Picture* pic, const Picture* currPic )

{

  pic->subPicExtStarted = true;

  const PPS* pps       = pic->cs->pps.get();

  const SPS* sps       = pic->cs->sps.get();

  const int  numSubPic = pps->getNumSubPics();

  pic->m_subPicRefBufs.resize( numSubPic );

  for( int i = 0; i < numSubPic; ++i )

  {

    const SubPic& currSubPic = pps->getSubPic( i );

    const Area    subPicArea( currSubPic.getSubPicLeft(),

                              currSubPic.getSubPicTop(),

                              currSubPic.getSubPicWidthInLumaSample(),

                              currSubPic.getSubPicHeightInLumaSample() );

    pic->m_subPicRefBufs[i].create( pic->chromaFormat, Size( subPicArea ), sps->getMaxCUWidth(), pic->margin, MEMORY_ALIGN_DEF_SIZE );

    static auto task = []( int, void* task_param )

    {

      SubPicExtTask* t = static_cast<SubPicExtTask*>( task_param );

      t->subPicBuf->copyFrom( t->picture->getRecoBuf().subBuf( t->subPicArea ) );

      t->picture->extendPicBorderBuf( *t->subPicBuf );

      return true;

    };

    m_subPicExtTasks.emplace_back( SubPicExtTask{ pic, &pic->m_subPicRefBufs[i], subPicArea } );

    m_decodeThreadPool->addBarrierTask( TP_TASK_NAME_ARG( "POC:" + std::to_string( currPic->poc ) + " subPicBorderExtTask refPOC:" + std::to_string( pic->poc ) )

                                        task,

                                        &m_subPicExtTasks.back(),

                                        &pic->m_borderExtTaskCounter,

                                        nullptr,

                                        { &pic->reconDone } );

  }

}

void DecLibRecon::swapBufs( CodingStructure& cs )

{

  cs.picture->m_bufs[PIC_RECONSTRUCTION].swap( m_fltBuf );

  cs.rebindPicBufs();   // ensure the recon buf in the coding structure points to the correct buffer

}

void DecLibRecon::decompressPicture( Picture* pcPic )

{

  m_currDecompPic = pcPic;

  CodingStructure& cs = *pcPic->cs;

  pcPic->progress = Picture::reconstructing;

#ifdef TRACE_ENABLE_ITT

  // mark start of frame

    pcPic->m_itt_decLibInst = m_itt_decInst;

  __itt_frame_begin_v3( pcPic->m_itt_decLibInst, nullptr );

#endif

  // Initialise the various objects for the new set of settings

  const SPS * sps = cs.sps.get();

  const PPS * pps = cs.pps.get();

  for( int i = 0; i < m_numDecThreads; i++ )

  {

    if( sps->getUseReshaper() )

    {

      m_pcThreadResource[i]->m_cReshaper.createDec( sps->getBitDepth() );

      m_pcThreadResource[i]->m_cReshaper.initSlice( pcPic->slices[0]->getNalUnitLayerId(), *pcPic->slices[0]->getPicHeader(), pcPic->slices[0]->getVPS_nothrow() );

    }

    m_pcThreadResource[i]->m_cIntraPred.init( sps->getChromaFormatIdc(), sps->getBitDepth() );

    m_pcThreadResource[i]->m_cInterPred.init( &m_cRdCost, sps->getChromaFormatIdc(), sps->getMaxCUHeight() );

    // Recursive structure

    m_pcThreadResource[i]->m_cTrQuant.init( pcPic );

    m_pcThreadResource[i]->m_cCuDecoder.init( &m_pcThreadResource[i]->m_cIntraPred, &m_pcThreadResource[i]->m_cInterPred, &m_pcThreadResource[i]->m_cReshaper, &m_pcThreadResource[i]->m_cTrQuant );

  }

  getCompatibleBuffer( *pcPic->cs, pcPic->cs->getRecoBuf(), m_fltBuf, pcPic->getUserAllocator() );

  const uint32_t  log2SaoOffsetScale = (uint32_t) std::max(0, sps->getBitDepth() - MAX_SAO_TRUNCATED_BITDEPTH);

  const int maxDepth = getLog2(sps->getMaxCUWidth()) - pps->pcv->minCUWidthLog2;

  m_cSAO.create( pps->getPicWidthInLumaSamples(),

                 pps->getPicHeightInLumaSamples(),

                 sps->getChromaFormatIdc(),

                 sps->getMaxCUWidth(),

                 sps->getMaxCUHeight(),

                 maxDepth,

                 log2SaoOffsetScale,

                 m_fltBuf

               );

  if( sps->getUseALF() )

  {

    m_cALF.create( cs.picHeader.get(), sps, pps, m_numDecThreads, m_fltBuf );

  }

  const PreCalcValues* pcv = cs.pcv;

  // set reconstruction buffers in CodingStructure

  const ptrdiff_t ctuSampleSizeL = pcv->maxCUHeight * pcv->maxCUWidth;

  const ptrdiff_t ctuSampleSizeC = isChromaEnabled( pcv->chrFormat ) ? ( ctuSampleSizeL >> ( getChannelTypeScaleX( CH_C, pcv->chrFormat ) + getChannelTypeScaleY( CH_C, pcv->chrFormat ) ) ) : 0;

  const ptrdiff_t ctuSampleSize  = ctuSampleSizeL + 2 * ctuSampleSizeC;

  const size_t    predBufSize    = ctuSampleSize * pcv->sizeInCtus;

  if( predBufSize != m_predBufSize )

  {

    m_predBuf.reset( ( Pel* ) xMalloc( Pel, predBufSize ) );

    m_predBufSize = predBufSize;

  }

  pcPic->cs->m_predBuf = m_predBuf.get();

  // for the worst case of all PUs being 8x8 and using DMVR

  const size_t _maxNumDmvrMvs = pcv->num8x8CtuBlks * pcv->sizeInCtus;

  if( _maxNumDmvrMvs != m_dmvrMvCacheSize )

  {

    if( m_dmvrMvCache ) free( m_dmvrMvCache );

    m_dmvrMvCacheSize = _maxNumDmvrMvs;

    m_dmvrMvCache     = ( Mv* ) malloc( sizeof( Mv ) * _maxNumDmvrMvs );

  }

  pcPic->cs->m_dmvrMvCache = m_dmvrMvCache;

  if( m_num4x4Elements != cs.pcv->num4x4CtuBlks * cs.pcv->sizeInCtus )

  {

    if( m_loopFilterParam ) free( m_loopFilterParam );

    if( m_motionInfo      ) free( m_motionInfo );

    m_num4x4Elements = cs.pcv->num4x4CtuBlks * cs.pcv->sizeInCtus;

    m_loopFilterParam = ( LoopFilterParam* ) malloc( sizeof( LoopFilterParam ) * m_num4x4Elements * 2 );

    m_motionInfo      = ( MotionInfo* )      malloc( sizeof( MotionInfo      ) * m_num4x4Elements );

  }

  // finished

  const int widthInCtus  = cs.pcv->widthInCtus;

  const int heightInCtus = cs.pcv->heightInCtus;

  pcPic->startProcessingTimer();

  if( m_decodeThreadPool->numThreads() > 0 )

  {

    ITT_TASKSTART( itt_domain_dec, itt_handle_schedTasks );

  }

  picBarriers.clear();

#if ALLOW_MIDER_LF_DURING_PICEXT

  CBarrierVec  picExtBarriers;

#else

  CBarrierVec &picExtBarriers = picBarriers;

#endif

  const int numSubPic = cs.pps->getNumSubPics();

  if( numSubPic > 1 )

  {

    m_subPicExtTasks.clear();

    m_subPicExtTasks.reserve( pcPic->slices.size() * MAX_NUM_REF_PICS * numSubPic );

  }

  std::vector<Picture*> borderExtRefPics( pcPic->buildAllRefPicsVec() );

  for( Picture* refPic : borderExtRefPics )

  {

    if( !refPic->borderExtStarted )

    {

      // TODO: (GH) Can we bypass this border extension, when all subpics (>1) are treated as pics?

      borderExtPic( refPic, pcPic );

    }

    if( !refPic->subPicExtStarted && numSubPic > 1 && refPic->m_subPicRefBufs.size() != numSubPic )

    {

      CHECK( !refPic->m_subPicRefBufs.empty(), "Wrong number of subpics already present in reference picture" );

      CHECK( cs.sps->getUseWrapAround(), "Wraparound + subpics not implemented" );

      createSubPicRefBufs( refPic, pcPic );

    }

    if( refPic->m_borderExtTaskCounter.isBlocked() &&

        std::find( picExtBarriers.cbegin(), picExtBarriers.cend(), refPic->m_borderExtTaskCounter.donePtr() ) == picExtBarriers.cend() )

    {

      picExtBarriers.push_back( refPic->m_borderExtTaskCounter.donePtr() );

    }

  }

  if( m_decodeThreadPool->numThreads() == 0 && (

       std::any_of( picExtBarriers.cbegin(), picExtBarriers.cend(), []( const Barrier* b ) { return b->isBlocked(); } ) ||

       std::any_of( picBarriers   .cbegin(), picBarriers   .cend(), []( const Barrier* b ) { return b->isBlocked(); } ) ) )

  {

    m_decodeThreadPool->processTasksOnMainThread();

  }

  const bool isIntra = std::all_of( pcPic->slices.begin(), pcPic->slices.end(), []( const Slice* pcSlice ) { return pcSlice->isIntra(); } );

  const int numColPerTask = std::max( std::min( widthInCtus, ( widthInCtus / std::max( m_numDecThreads * ( isIntra ? 2 : 1 ), 1 ) ) + ( isIntra ? 0 : 1 ) ), 1 );

  const int numTasksPerLine = widthInCtus / numColPerTask + !!( widthInCtus % numColPerTask );

#if ALLOW_MIDER_LF_DURING_PICEXT

  pcPic->refPicExtDepBarriers = std::move( picExtBarriers );

#endif

#if !RECO_WHILE_PARSE

  picBarriers.push_back( &cs.picture->parseDone );

#endif

  const TaskType ctuStartState = MIDER;

  const bool     doALF         = cs.sps->getUseALF() && !AdaptiveLoopFilter::getAlfSkipPic( cs );

  commonTaskParam.reset( cs, ctuStartState, numTasksPerLine, doALF );

  tasksFinishMotion = std::vector<LineTaskParam>( heightInCtus, LineTaskParam{ commonTaskParam, -1 } );

  tasksCtu          = std::vector<CtuTaskParam >( heightInCtus * numTasksPerLine, CtuTaskParam{ commonTaskParam, -1, -1, {} } );

  pcPic->reconDone.lock();

#if 0

  // schedule in raster scan order

  for( int line = 0; line < heightInCtus; ++line )

  {

    for( int col = 0; col < widthInCtus;  ++col )

    {

#else

  // schedule in zig-zag scan order

  for( int i = 0; i < numTasksPerLine + heightInCtus; ++i )

  {

    int line = 0;

    for( int col = i; col >= 0; --col, ++line )

    {

#endif

      if( line < heightInCtus && col < numTasksPerLine )

      {

        CBarrierVec ctuBarriers = picBarriers;

        const int   ctuStart    = col * numColPerTask;

        const int   ctuEnd      = std::min( ctuStart + numColPerTask, widthInCtus );

#if RECO_WHILE_PARSE

        if( pcPic->parseDone.isBlocked() )

        {

          // wait for the last CTU in the current line to be parsed

          ctuBarriers.push_back( &pcPic->ctuParsedBarrier[( line + 1 ) * widthInCtus - 1] );

        }

#endif

        CtuTaskParam* param    = &tasksCtu[line * numTasksPerLine + col];

        param->taskLine        = line;

        param->taskCol         = col;

        param->ctuEnd          = ctuEnd;

        param->ctuStart        = ctuStart;

        param->numColPerTask   = numColPerTask;

        param->numTasksPerLine = numTasksPerLine;

        m_decodeThreadPool->addBarrierTask( TP_TASK_NAME_ARG( "POC:" + std::to_string(pcPic->poc) + " ctuTask:" + std::to_string( col ) + "," + std::to_string( line ) )

                                            ctuTask<false>,

                                            param,

                                            &pcPic->m_ctuTaskCounter,

                                            nullptr,

                                            std::move( ctuBarriers ),

                                            ctuTask<true> );

      }

    }

  }

  {

    static auto finishReconTask = []( int, void* task_param )

    {

      FinishPicTaskParam* param = static_cast<FinishPicTaskParam*>( task_param );

      CodingStructure& cs = *param->pic->cs;

      if( cs.sps->getUseALF() && !AdaptiveLoopFilter::getAlfSkipPic( cs ) )

      {

        param->decLib->swapBufs( cs );

      }

      cs.deallocTempInternals();

#ifdef TRACE_ENABLE_ITT

      // mark end of frame

      __itt_frame_end_v3( param->pic->m_itt_decLibInst, nullptr );

#endif

      param->pic->stopProcessingTimer();

      param->pic->progress = Picture::reconstructed;

      return true;

    };

    taskFinishPic = FinishPicTaskParam( this, pcPic );

    m_decodeThreadPool->addBarrierTask( TP_TASK_NAME_ARG( "POC:" + std::to_string( pcPic->poc ) + " finishPicTask" )

                                        finishReconTask,

                                        &taskFinishPic,

                                        &pcPic->m_divTasksCounter,

                                        &pcPic->reconDone,

                                        { pcPic->m_ctuTaskCounter.donePtr() } );

  }

  if( m_decodeThreadPool->numThreads() == 0 )

  {

  }

  else

  {

    ITT_TASKEND( itt_domain_dec, itt_handle_schedTasks );

  }

}

Picture* DecLibRecon::waitForPrevDecompressedPic()

{

  if( !m_currDecompPic )

    return nullptr;

  ITT_TASKSTART( itt_domain_dec, itt_handle_waitTasks );

  try

  {

    if( m_decodeThreadPool->numThreads() == 0 )

    {

      /*bool stillTasksWaiting = */ m_decodeThreadPool->processTasksOnMainThread();

      CHECK_FATAL( m_currDecompPic->reconDone.isBlocked(), "can't make progress. some dependecy has not been finished" );

    }

    const Slice*   lastSlice           = m_currDecompPic->slices.back();

    const unsigned lastSliceLastCtuIdx = lastSlice->getCtuAddrInSlice( lastSlice->getNumCtuInSlice() - 1 );

    CHECK( lastSliceLastCtuIdx != m_currDecompPic->cs->pcv->sizeInCtus - 1, "Picture incomplete. A slice was probably lost." );

    m_currDecompPic->reconDone.wait();

  }

  catch( ... )

  {

    m_currDecompPic->error = true;

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

  }

  // also check error flag, which can have been set earlier (e.g., when trying to use the picture as reference)

  if( m_currDecompPic->error || m_currDecompPic->reconDone.hasException() )

  {

    // ensure all tasks are cleared from declibRecon

    cleanupOnException();

  }

  ITT_TASKEND( itt_domain_dec, itt_handle_waitTasks );

  return std::exchange( m_currDecompPic, nullptr );

}

void DecLibRecon::cleanupOnException()

{

  // there was an exception anywhere in m_currDecompPic

  // => we need to wait for all tasks to be cleared from the thread pool

  m_currDecompPic->waitForAllTasks();

  commonTaskParam.ctuStates.clear();

}

template<bool onlyCheckReadyState>

bool DecLibRecon::ctuTask( int tid, void* task_param )

{

  CtuTaskParam* param = static_cast<CtuTaskParam*>( task_param );

  const int       taskCol      = param->taskCol;

  const int       line         = param->taskLine;

  const int       col          = taskCol;

  auto&           cs           = *param->common.cs;

  auto&           decLib       = param->common.decLib;

  const int       tasksPerLine = param->numTasksPerLine;

  const int       heightInCtus = cs.pcv->heightInCtus;

  CtuState&       thisCtuState =  param->common.ctuStates[line * tasksPerLine + taskCol];

  const CtuState* thisLine     = &param->common.ctuStates[line * tasksPerLine];

  const CtuState* lineAbove    = thisLine - tasksPerLine;

  const CtuState* lineBelow    = thisLine + tasksPerLine;

  const int       ctuStart     = param->ctuStart;

  const int       ctuEnd       = param->ctuEnd;

  if( cs.picture->m_ctuTaskCounter.hasException() )

  {

    std::rethrow_exception( cs.picture->m_ctuTaskCounter.getException() );

  }

  switch( thisCtuState.load() )

  {

    // all case statements fall through to continue with next task, unless they return false due to unsatisfied preconditions

  case MIDER:

  {

    if( col > 0 && thisLine[col - 1] <= MIDER_cont )

      return false;

    if( line > 0 )

    {

      if( col + 1 < tasksPerLine )

      {

        if( lineAbove[col + 1] <= MIDER )

          return false;

      }

      else

      {

        if( lineAbove[col] <= MIDER_cont )

          return false;

      }

    }

    if( onlyCheckReadyState )

      return true;

    ITT_TASKSTART( itt_domain_dec, itt_handle_mider );

    for( int ctu = ctuStart; ctu < ctuEnd; ctu++ )

    {

      const int ctuRsAddr = ctu + line * cs.pcv->widthInCtus;

      CtuData& ctuData    = cs.getCtuData( ctuRsAddr );

      ctuData.motion      = &decLib.m_motionInfo[cs.pcv->num4x4CtuBlks * ctuRsAddr];

      if( !ctuData.slice->isIntra() || cs.sps->getIBCFlag() )

      {

        const UnitArea ctuArea = getCtuArea( cs, ctu, line, true );

        decLib.m_pcThreadResource[tid]->m_cCuDecoder.TaskDeriveCtuMotionInfo( cs, ctuRsAddr, ctuArea, param->common.perLineMiHist[line] );

      }

      else

      {

        memset( NO_WARNING_class_memaccess( ctuData.motion ), MI_NOT_VALID, sizeof( MotionInfo ) * cs.pcv->num4x4CtuBlks );

      }

      thisCtuState = MIDER_cont;

    }

    thisCtuState = LF_INIT;

    ITT_TASKEND( itt_domain_dec, itt_handle_mider );

  }

  case LF_INIT:

  {

    if( onlyCheckReadyState )

      return true;

    ITT_TASKSTART( itt_domain_dec, itt_handle_lfcl );

    for( int ctu = ctuStart; ctu < ctuEnd; ctu++ )

    {

      const int ctuRsAddr = ctu + line * cs.pcv->widthInCtus;

      CtuData& ctuData    = cs.getCtuData( ctuRsAddr );

      ctuData.lfParam[0]  = &decLib.m_loopFilterParam[cs.pcv->num4x4CtuBlks * ( 2 * ctuRsAddr + 0 )];

      ctuData.lfParam[1]  = &decLib.m_loopFilterParam[cs.pcv->num4x4CtuBlks * ( 2 * ctuRsAddr + 1 )];

      memset( ctuData.lfParam[0], 0, sizeof( LoopFilterParam ) * 2 * cs.pcv->num4x4CtuBlks );

      decLib.m_cLoopFilter.calcFilterStrengthsCTU( cs, ctuRsAddr );

    }

    thisCtuState = INTER;

    ITT_TASKEND( itt_domain_dec, itt_handle_lfcl );

  }

  case INTER:

  {

    if( std::all_of( cs.picture->slices.begin(), cs.picture->slices.end(), []( const Slice* pcSlice ) { return pcSlice->isIntra(); } ) )

vvdec::DecLibRecon::ctuTask<false>(int, void*)::{lambda(vvdec::Slice const*)#1}::operator()(vvdec::Slice const*) const

Line

Count

Source

833

3.55k

    if( std::all_of( cs.picture->slices.begin(), cs.picture->slices.end(), []( const Slice* pcSlice ) { return pcSlice->isIntra(); } ) )

vvdec::DecLibRecon::ctuTask<true>(int, void*)::{lambda(vvdec::Slice const*)#1}::operator()(vvdec::Slice const*) const

Line

Count

Source

833

21.3k

    if( std::all_of( cs.picture->slices.begin(), cs.picture->slices.end(), []( const Slice* pcSlice ) { return pcSlice->isIntra(); } ) )

    {

      // not really necessary, but only for optimizing the wave-fronts

      if( col > 1 && thisLine[col - 2] <= INTER )

        return false;

      if( line > 0 && lineAbove[col] <= INTER )

        return false;

    }

    if( std::any_of( cs.picture->refPicExtDepBarriers.cbegin(), cs.picture->refPicExtDepBarriers.cend(), []( const Barrier* b ) { return b->isBlocked(); } ) )

Unexecuted instantiation: vvdec::DecLibRecon::ctuTask<false>(int, void*)::{lambda(vvdec::Barrier const*)#1}::operator()(vvdec::Barrier const*) const

Unexecuted instantiation: vvdec::DecLibRecon::ctuTask<true>(int, void*)::{lambda(vvdec::Barrier const*)#1}::operator()(vvdec::Barrier const*) const

    {

      return false;

    }

    if( onlyCheckReadyState )

      return true;

    ITT_TASKSTART( itt_domain_dec, itt_handle_inter );

    for( int ctu = ctuStart; ctu < ctuEnd; ctu++ )

    {

      const int ctuRsAddr    = ctu + line * cs.pcv->widthInCtus;

      const UnitArea ctuArea = getCtuArea( cs, ctu, line, true );

      const CtuData& ctuData = cs.getCtuData( ctuRsAddr );

      decLib.m_pcThreadResource[tid]->m_cCuDecoder.TaskTrafoCtu( cs, ctuRsAddr, ctuArea );

      if( !ctuData.slice->isIntra() )

      {

        decLib.m_pcThreadResource[tid]->m_cCuDecoder.TaskInterCtu( cs, ctuRsAddr, ctuArea );

        if( cs.picture->stillReferenced )

        {

          decLib.m_pcThreadResource[tid]->m_cCuDecoder.TaskFinishMotionInfo( cs, ctuRsAddr, ctu, line );

        }

      }

    }

    thisCtuState = INTRA;

    ITT_TASKEND( itt_domain_dec, itt_handle_inter );

  }

  case INTRA:

  {

    if( col > 0 && thisLine[col - 1] <= INTRA_cont )

      return false;

    if( line > 0 )

    {

      if( col + 1 < tasksPerLine )

      {

        if( lineAbove[col + 1] <= INTRA )

          return false;

      }

      else

      {

        if( lineAbove[col] <= INTRA_cont )

          return false;

      }

    }

    if( onlyCheckReadyState )

      return true;

    ITT_TASKSTART( itt_domain_dec, itt_handle_intra );

    for( int ctu = ctuStart; ctu < ctuEnd; ctu++ )

    {

      const int ctuRsAddr    = ctu + line * cs.pcv->widthInCtus;

      const UnitArea ctuArea = getCtuArea( cs, ctu, line, true );

      decLib.m_pcThreadResource[tid]->m_cCuDecoder.TaskCriticalIntraKernel( cs, ctuRsAddr, ctuArea );

      thisCtuState = INTRA_cont;

    }

    thisCtuState = RSP;

    ITT_TASKEND( itt_domain_dec, itt_handle_intra );

  }

  case RSP:

  {

    // RIRZIIIII

    // IIIIIXXXX

    //

    // - Z can be reshaped when it is no more an intra prediction source for X in the next line

    if     ( line + 1 < heightInCtus && col + 1 < tasksPerLine && lineBelow[col + 1] < INTRA_cont )

      return false;

    else if( line + 1 < heightInCtus &&                           lineBelow[col]     < RSP )

      return false;

    else if(                            col + 1 < tasksPerLine && thisLine [col + 1] < INTRA_cont ) // need this for the last line

      return false;

    if( onlyCheckReadyState )

      return true;

    ITT_TASKSTART( itt_domain_dec, itt_handle_rsp );

    for( int ctu = ctuStart; ctu < ctuEnd; ctu++ )

    {

      decLib.m_pcThreadResource[tid]->m_cReshaper.rspCtuBcw( cs, ctu, line );

    }

    ITT_TASKEND( itt_domain_dec, itt_handle_rsp );

    thisCtuState = LF_V;

  }

  case LF_V:

  {

    if( col > 0 && thisLine[col - 1] < LF_V )

      return false;

    if( onlyCheckReadyState )

      return true;

    ITT_TASKSTART( itt_domain_dec, itt_handle_lfl );

    for( int ctu = ctuStart; ctu < ctuEnd; ctu++ )

    {

      decLib.m_cLoopFilter.loopFilterCTU( cs, MAX_NUM_CHANNEL_TYPE, ctu, line, EDGE_VER );

      thisCtuState = LF_V_cont;

    }

    thisCtuState = LF_H;

    ITT_TASKEND( itt_domain_dec, itt_handle_lfl );

  }

  case LF_H:

  {

    if( line > 0 && lineAbove[col] < LF_H )

      return false;

    if( line > 0 && col + 1 < tasksPerLine && lineAbove[col + 1] < LF_V_cont )

      return false;

    if(             col + 1 < tasksPerLine && thisLine[col + 1] < LF_V_cont )

      return false;

    if( onlyCheckReadyState )

      return true;

    ITT_TASKSTART( itt_domain_dec, itt_handle_lfl );

    for( int ctu = ctuStart; ctu < ctuEnd; ctu++ )

    {

      decLib.m_cLoopFilter.loopFilterCTU( cs, MAX_NUM_CHANNEL_TYPE, ctu, line, EDGE_HOR );