/* The copyright in this software is being made available under the BSD
 * License, included below. This software may be subject to other third party
 * and contributor rights, including patent rights, and no such rights are
 * granted under this license.
 *
 * Copyright (c) 2010-2023, ITU/ISO/IEC
 * 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.
 *  * Neither the name of the ITU/ISO/IEC nor the names of its contributors may
 *    be used to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * 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.
 */

#include "CommonDef.h"
#include "Unit.h"
#include "PictureParameterSet.h"
#include "Slice.h"

PPS::PPS()
  : m_ppsId(0)
  , m_spsId(0)
  , m_picInitQPMinus26(0)
  , m_useDQP(false)
  , m_usePPSChromaTool(false)
  , m_sliceChromaQpFlag(false)
  , m_chromaCbQpOffset(0)
  , m_chromaCrQpOffset(0)
  , m_chromaCbCrQpOffset(0)
  , m_chromaQpOffsetListLen(0)
  , m_numRefIdxDefaultActive{ 1, 1 }
  , m_rpl1IdxPresentFlag(false)
  , m_numSubPics(1)
  , m_subPicIdMappingInPpsFlag(0)
  , m_subPicIdLen(16)
  , m_noPicPartitionFlag(1)
  , m_log2CtuSize(0)
  , m_ctuSize(0)
  , m_picWidthInCtu(0)
  , m_picHeightInCtu(0)
  , m_numTileCols(1)
  , m_numTileRows(1)
  , m_rectSliceFlag(1)
  , m_singleSlicePerSubPicFlag(0)
  , m_numSlicesInPic(1)
  , m_tileIdxDeltaPresentFlag(0)
  , m_loopFilterAcrossTilesEnabledFlag(1)
  , m_loopFilterAcrossSlicesEnabledFlag(0)
  , m_cabacInitPresentFlag(false)
  , m_pictureHeaderExtensionPresentFlag(0)
  , m_sliceHeaderExtensionPresentFlag(false)
  , m_deblockingFilterControlPresentFlag(false)
  , m_deblockingFilterOverrideEnabledFlag(false)
  , m_ppsDeblockingFilterDisabledFlag(false)
  , m_deblockingFilterBetaOffsetDiv2(0)
  , m_deblockingFilterTcOffsetDiv2(0)
  , m_deblockingFilterCbBetaOffsetDiv2(0)
  , m_deblockingFilterCbTcOffsetDiv2(0)
  , m_deblockingFilterCrBetaOffsetDiv2(0)
  , m_deblockingFilterCrTcOffsetDiv2(0)
  , m_listsModificationPresentFlag(0)
  , m_rplInfoInPhFlag(0)
  , m_dbfInfoInPhFlag(0)
  , m_saoInfoInPhFlag(0)
  , m_alfInfoInPhFlag(0)
  , m_wpInfoInPhFlag(0)
  , m_qpDeltaInfoInPhFlag(0)
  , m_mixedNaluTypesInPicFlag(false)
  , m_conformanceWindowFlag(false)
  , m_picWidthInLumaSamples(352)
  , m_picHeightInLumaSamples(288)
  , m_explicitScalingWindowFlag(false)
  , m_wrapAroundEnabledFlag(false)
  , m_picWidthMinusWrapAroundOffset(0)
  , m_wrapAroundOffset(0)
  , pcv(nullptr)
{
  // Array includes entry [0] for the null offset used when cu_chroma_qp_offset_flag=0. This is initialised here
  // and never subsequently changed.
  m_chromaQpAdjTableIncludingNullEntry[0].u.comp.cbOffset        = 0;
  m_chromaQpAdjTableIncludingNullEntry[0].u.comp.crOffset        = 0;
  m_chromaQpAdjTableIncludingNullEntry[0].u.comp.jointCbCrOffset = 0;
}

PPS::~PPS()
{
  delete pcv;
}

void PPS::setQpOffset(const ComponentID compID, const int i )
{
  if (compID == COMPONENT_Cb)
  {
    m_chromaCbQpOffset = i;
  }
  else if (compID==COMPONENT_Cr)
  {
    m_chromaCrQpOffset = i;
  }
  else if (compID==JOINT_CbCr)
  {
    m_chromaCbCrQpOffset = i;
  }
  else
  {
    THROW( "Invalid chroma QP offset" );
  }
}

const ChromaQpAdj& PPS::getChromaQpOffsetListEntry(const int cuChromaQpOffsetIdxPlus1) const
{
  CHECK(cuChromaQpOffsetIdxPlus1 >= m_chromaQpOffsetListLen+1, "Invalid chroma QP offset");
  // Array includes entry [0] for the null offset used when
  // cu_chroma_qp_offset_flag=0, and entries [cu_chroma_qp_offset_idx+1...] otherwise
  return m_chromaQpAdjTableIncludingNullEntry[cuChromaQpOffsetIdxPlus1];
}


void PPS::setChromaQpOffsetListEntry(const int cuChromaQpOffsetIdxPlus1,const int cbOffset,const int crOffset,const int jointCbCrOffset )
{
  // Array includes entry [0] for the null offset used when cu_chroma_qp_offset_flag=0, and entries
  // [cu_chroma_qp_offset_idx+1...] otherwise
  CHECK(cuChromaQpOffsetIdxPlus1 == 0 || cuChromaQpOffsetIdxPlus1 > MAX_QP_OFFSET_LIST_SIZE, "Invalid chroma QP offset");
  m_chromaQpAdjTableIncludingNullEntry[cuChromaQpOffsetIdxPlus1].u.comp.cbOffset        = cbOffset;
  m_chromaQpAdjTableIncludingNullEntry[cuChromaQpOffsetIdxPlus1].u.comp.crOffset        = crOffset;
  m_chromaQpAdjTableIncludingNullEntry[cuChromaQpOffsetIdxPlus1].u.comp.jointCbCrOffset = jointCbCrOffset;
  m_chromaQpOffsetListLen = std::max(m_chromaQpOffsetListLen, cuChromaQpOffsetIdxPlus1);
}

// reset tile and slice parameters and lists
void PPS::resetTileSliceInfo()
{
  m_numExpTileCols = 0;
  m_numExpTileRows = 0;
  m_numTileCols    = 0;
  m_numTileRows    = 0;
  m_numSlicesInPic = 0;
  m_tileColWidth.clear();
  m_tileRowHeight.clear();
  m_tileColBd.clear();
  m_tileRowBd.clear();
  m_ctuToTileCol.clear();
  m_ctuToTileRow.clear();
  m_ctuToSubPicIdx.clear();
  m_rectSlices.clear();
  m_sliceMap.clear();
}

// initialize tile row/column sizes and boundaries
void PPS::initTiles()
{
  int       colIdx, rowIdx;
  int       ctuX, ctuY;

  // check explicit tile column sizes
  uint32_t  remainingWidthInCtu  = m_picWidthInCtu;

  for( colIdx = 0; colIdx < m_numExpTileCols; colIdx++ )
  {
    CHECK(m_tileColWidth[colIdx] > remainingWidthInCtu,    "Tile column width exceeds picture width");
    remainingWidthInCtu -= m_tileColWidth[colIdx];
  }

  // divide remaining picture width into uniform tile columns
  uint32_t  uniformTileColWidth = m_tileColWidth[colIdx-1];
  while( remainingWidthInCtu > 0 )
  {
    CHECK(colIdx >= MAX_TILE_COLS, "Number of tile columns exceeds valid range");
    uniformTileColWidth = std::min(remainingWidthInCtu, uniformTileColWidth);
    m_tileColWidth.push_back( uniformTileColWidth );
    remainingWidthInCtu -= uniformTileColWidth;
    colIdx++;
  }
  m_numTileCols = colIdx;

  // check explicit tile row sizes
  uint32_t  remainingHeightInCtu  = m_picHeightInCtu;

  for( rowIdx = 0; rowIdx < m_numExpTileRows; rowIdx++ )
  {
    CHECK(m_tileRowHeight[rowIdx] > remainingHeightInCtu,     "Tile row height exceeds picture height");
    remainingHeightInCtu -= m_tileRowHeight[rowIdx];
  }

  // divide remaining picture height into uniform tile rows
  uint32_t  uniformTileRowHeight = m_tileRowHeight[rowIdx - 1];
  while( remainingHeightInCtu > 0 )
  {
    uniformTileRowHeight = std::min(remainingHeightInCtu, uniformTileRowHeight);
    m_tileRowHeight.push_back( uniformTileRowHeight );
    remainingHeightInCtu -= uniformTileRowHeight;
    rowIdx++;
  }
  m_numTileRows = rowIdx;

  // set left column bounaries
  m_tileColBd.push_back( 0 );
  for( colIdx = 0; colIdx < m_numTileCols; colIdx++ )
  {
    m_tileColBd.push_back( m_tileColBd[ colIdx ] + m_tileColWidth[ colIdx ] );
  }

  // set top row bounaries
  m_tileRowBd.push_back( 0 );
  for( rowIdx = 0; rowIdx < m_numTileRows; rowIdx++ )
  {
    m_tileRowBd.push_back( m_tileRowBd[ rowIdx ] + m_tileRowHeight[ rowIdx ] );
  }

  // set mapping between horizontal CTU address and tile column index
  colIdx = 0;
  for( ctuX = 0; ctuX <= m_picWidthInCtu; ctuX++ )
  {
    if( ctuX == m_tileColBd[ colIdx + 1 ] )
    {
      colIdx++;
    }
    m_ctuToTileCol.push_back( colIdx );
  }

  // set mapping between vertical CTU address and tile row index
  rowIdx = 0;
  for( ctuY = 0; ctuY <= m_picHeightInCtu; ctuY++ )
  {
    if( ctuY == m_tileRowBd[ rowIdx + 1 ] )
    {
      rowIdx++;
    }
    m_ctuToTileRow.push_back( rowIdx );
  }
}

// - initialize memory for rectangular slice parameters
void PPS::initRectSlices()
{
  CHECK(m_numSlicesInPic > MAX_SLICES, "Number of slices in picture exceeds valid range");
  m_rectSlices.resize(m_numSlicesInPic);
}

// initialize mapping between rectangular slices and CTUs
void PPS::initRectSliceMap(const SPS  *sps)
{
  uint32_t  ctuY;
  uint32_t  tileX, tileY;

  if (sps)
  {
    m_ctuToSubPicIdx.resize(getPicWidthInCtu() * getPicHeightInCtu());
    if (sps->getNumSubPics() > 1)
    {
      for (int i = 0; i <= sps->getNumSubPics() - 1; i++)
      {
        for (int y = sps->getSubPicCtuTopLeftY(i); y < sps->getSubPicCtuTopLeftY(i) + sps->getSubPicHeight(i); y++)
        {
          for (int x = sps->getSubPicCtuTopLeftX(i); x < sps->getSubPicCtuTopLeftX(i) + sps->getSubPicWidth(i); x++)
          {
            m_ctuToSubPicIdx[ x+ y * getPicWidthInCtu()] = i;
          }
        }
      }
    }
    else
    {
      for (int i = 0; i < getPicWidthInCtu() * getPicHeightInCtu(); i++)
      {
        m_ctuToSubPicIdx[i] = 0;
      }
    }
  }

  if( getSingleSlicePerSubPicFlag() )
  {
    CHECK (sps==nullptr, "RectSliceMap can only be initialized for slice_per_sub_pic_flag with a valid SPS");
    m_numSlicesInPic = sps->getNumSubPics();

    // allocate new memory for slice list
    CHECK(m_numSlicesInPic > MAX_SLICES, "Number of slices in picture exceeds valid range");
    m_sliceMap.resize( m_numSlicesInPic );

    if (sps->getNumSubPics() > 1)
    {
      // Q2001 v15 equation 29
      std::vector<uint32_t> subpicWidthInTiles;
      std::vector<uint32_t> subpicHeightInTiles;
      std::vector<uint32_t> subpicHeightLessThanOneTileFlag;
      subpicWidthInTiles.resize(sps->getNumSubPics());
      subpicHeightInTiles.resize(sps->getNumSubPics());
      subpicHeightLessThanOneTileFlag.resize(sps->getNumSubPics());
      for (uint32_t i = 0; i <sps->getNumSubPics(); i++)
      {
        uint32_t leftX = sps->getSubPicCtuTopLeftX(i);
        uint32_t rightX = leftX + sps->getSubPicWidth(i) - 1;
        subpicWidthInTiles[i] = m_ctuToTileCol[rightX] + 1 - m_ctuToTileCol[leftX];

        uint32_t topY = sps->getSubPicCtuTopLeftY(i);
        uint32_t bottomY = topY + sps->getSubPicHeight(i) - 1;
        subpicHeightInTiles[i] = m_ctuToTileRow[bottomY] + 1 - m_ctuToTileRow[topY];

        if (subpicHeightInTiles[i] == 1 && sps->getSubPicHeight(i) < m_tileRowHeight[m_ctuToTileRow[topY]] )
        {
          subpicHeightLessThanOneTileFlag[i] = 1;
        }
        else
        {
          subpicHeightLessThanOneTileFlag[i] = 0;
        }
      }

      for( int i = 0; i < m_numSlicesInPic; i++ )
      {
        CHECK(m_numSlicesInPic != sps->getNumSubPics(), "in single slice per subpic mode, number of slice and subpic shall be equal");
        m_sliceMap[ i ].initSliceMap();
        if (subpicHeightLessThanOneTileFlag[i])
        {
          m_sliceMap[i].addCtusToSlice(sps->getSubPicCtuTopLeftX(i), sps->getSubPicCtuTopLeftX(i) + sps->getSubPicWidth(i),
                                       sps->getSubPicCtuTopLeftY(i), sps->getSubPicCtuTopLeftY(i) + sps->getSubPicHeight(i), m_picWidthInCtu);
        }
        else
        {
          tileX = m_ctuToTileCol[sps->getSubPicCtuTopLeftX(i)];
          tileY = m_ctuToTileRow[sps->getSubPicCtuTopLeftY(i)];
          for (uint32_t j = 0; j< subpicHeightInTiles[i]; j++)
          {
            for (uint32_t k = 0; k < subpicWidthInTiles[i]; k++)
            {
              m_sliceMap[i].addCtusToSlice(getTileColumnBd(tileX + k), getTileColumnBd(tileX + k + 1), getTileRowBd(tileY + j), getTileRowBd(tileY + j + 1), m_picWidthInCtu);
            }
          }
        }
      }
      subpicWidthInTiles.clear();
      subpicHeightInTiles.clear();
      subpicHeightLessThanOneTileFlag.clear();
    }
    else
    {
      m_sliceMap[0].initSliceMap();
      for (int tileY=0; tileY<m_numTileRows; tileY++)
      {
        for (int tileX=0; tileX<m_numTileCols; tileX++)
        {
          m_sliceMap[0].addCtusToSlice(getTileColumnBd(tileX), getTileColumnBd(tileX + 1),
                                       getTileRowBd(tileY), getTileRowBd(tileY + 1), m_picWidthInCtu);
        }
      }
      m_sliceMap[0].setSliceID(0);
    }
  }
  else
  {
    // allocate new memory for slice list
    CHECK(m_numSlicesInPic > MAX_SLICES, "Number of slices in picture exceeds valid range");
    m_sliceMap.resize( m_numSlicesInPic );
    // generate CTU maps for all rectangular slices in picture
    for( uint32_t i = 0; i < m_numSlicesInPic; i++ )
    {
      m_sliceMap[ i ].initSliceMap();

      // get position of first tile in slice
      tileX =  m_rectSlices[ i ].getTileIdx() % m_numTileCols;
      tileY =  m_rectSlices[ i ].getTileIdx() / m_numTileCols;

      // infer slice size for last slice in picture
      if( i == m_numSlicesInPic-1 )
      {
        m_rectSlices[ i ].setSliceWidthInTiles ( m_numTileCols - tileX );
        m_rectSlices[ i ].setSliceHeightInTiles( m_numTileRows - tileY );
        m_rectSlices[ i ].setNumSlicesInTile( 1 );
      }

      // set slice index
      m_sliceMap[ i ].setSliceID(i);

      // complete tiles within a single slice case
      if( m_rectSlices[ i ].getSliceWidthInTiles( ) > 1 || m_rectSlices[ i ].getSliceHeightInTiles( ) > 1)
      {
        for( uint32_t j = 0; j < m_rectSlices[ i ].getSliceHeightInTiles( ); j++ )
        {
          for( uint32_t k = 0; k < m_rectSlices[ i ].getSliceWidthInTiles( ); k++ )
          {
            m_sliceMap[ i ].addCtusToSlice( getTileColumnBd(tileX + k), getTileColumnBd(tileX + k +1),
                                            getTileRowBd(tileY + j), getTileRowBd(tileY + j +1), m_picWidthInCtu);
          }
        }
      }
      // multiple slices within a single tile case
      else
      {
        uint32_t  numSlicesInTile = m_rectSlices[ i ].getNumSlicesInTile( );

        ctuY = getTileRowBd( tileY );
        for( uint32_t j = 0; j < numSlicesInTile-1; j++ )
        {
          m_sliceMap[ i ].addCtusToSlice( getTileColumnBd(tileX), getTileColumnBd(tileX+1),
                                          ctuY, ctuY + m_rectSlices[ i ].getSliceHeightInCtu(), m_picWidthInCtu);
          ctuY += m_rectSlices[ i ].getSliceHeightInCtu();
          i++;
          m_sliceMap[ i ].initSliceMap();
          m_sliceMap[ i ].setSliceID(i);
        }

        // infer slice height for last slice in tile
        CHECK( ctuY >= getTileRowBd( tileY + 1 ), "Invalid rectangular slice signalling");
        m_rectSlices[ i ].setSliceHeightInCtu( getTileRowBd( tileY + 1 ) - ctuY );
        m_sliceMap[ i ].addCtusToSlice( getTileColumnBd(tileX), getTileColumnBd(tileX+1),
                                        ctuY, getTileRowBd( tileY + 1 ), m_picWidthInCtu);
      }
    }
  }
  // check for valid rectangular slice map
  checkSliceMap();
}

// initialize mapping between subpicture and CTUs
void PPS::initSubPic(const SPS &sps)
{
  if (getSubPicIdMappingInPpsFlag())
  {
    // When signalled, the number of subpictures has to match in PPS and SPS
    CHECK (getNumSubPics() != sps.getNumSubPics(), "pps_num_subpics_minus1 shall be equal to sps_num_subpics_minus1");
  }
  else
  {
    // When not signalled  set the numer equal for convenient access
    setNumSubPics(sps.getNumSubPics());
  }

  CHECK(getNumSubPics() > MAX_NUM_SUB_PICS, "Number of sub-pictures in picture exceeds valid range");
  m_subPics.resize(getNumSubPics());

  // Check that no subpicture is specified outside of the conformance cropping window
  for(int i = 0; i < sps.getNumSubPics(); i++)
  {
    CHECK( (sps.getSubPicCtuTopLeftX(i) * sps.getCTUSize()) >=
          (sps.getMaxPicWidthInLumaSamples() - sps.getConformanceWindow().getWindowRightOffset() * SPS::getWinUnitX(sps.getChromaFormatIdc())),
          "No subpicture can be located completely outside of the conformance cropping window");
    CHECK( ((sps.getSubPicCtuTopLeftX(i) + sps.getSubPicWidth(i)) * sps.getCTUSize()) <= (sps.getConformanceWindow().getWindowLeftOffset() * SPS::getWinUnitX(sps.getChromaFormatIdc())),
          "No subpicture can be located completely outside of the conformance cropping window" );
    CHECK( (sps.getSubPicCtuTopLeftY(i) * sps.getCTUSize()) >=
          (sps.getMaxPicHeightInLumaSamples()  - sps.getConformanceWindow().getWindowBottomOffset() * SPS::getWinUnitY(sps.getChromaFormatIdc())),
          "No subpicture can be located completely outside of the conformance cropping window");
    CHECK( ((sps.getSubPicCtuTopLeftY(i) + sps.getSubPicHeight(i)) * sps.getCTUSize()) <= (sps.getConformanceWindow().getWindowTopOffset() * SPS::getWinUnitY(sps.getChromaFormatIdc())),
          "No subpicture can be located completely outside of the conformance cropping window");
  }

  // m_ctuSize,  m_picWidthInCtu, and m_picHeightInCtu might not be initialized yet.
  if (m_ctuSize == 0 || m_picWidthInCtu == 0 || m_picHeightInCtu == 0)
  {
    m_ctuSize = sps.getCTUSize();
    m_picWidthInCtu = (m_picWidthInLumaSamples + m_ctuSize - 1) / m_ctuSize;
    m_picHeightInCtu = (m_picHeightInLumaSamples + m_ctuSize - 1) / m_ctuSize;
  }
  for (int i=0; i< getNumSubPics(); i++)
  {
    m_subPics[i].setSubPicIdx(i);
    if(sps.getSubPicIdMappingExplicitlySignalledFlag())
    {
      if(m_subPicIdMappingInPpsFlag)
      {
        m_subPics[i].setSubPicID(m_subPicId[i]);
      }
      else
      {
        m_subPics[i].setSubPicID(sps.getSubPicId(i));
      }
    }
    else
    {
      m_subPics[i].setSubPicID(i);
    }
    m_subPics[i].setSubPicCtuTopLeftX(sps.getSubPicCtuTopLeftX(i));
    m_subPics[i].setSubPicCtuTopLeftY(sps.getSubPicCtuTopLeftY(i));
    m_subPics[i].setSubPicWidthInCTUs(sps.getSubPicWidth(i));
    m_subPics[i].setSubPicHeightInCTUs(sps.getSubPicHeight(i));

    uint32_t firstCTU = sps.getSubPicCtuTopLeftY(i) * m_picWidthInCtu + sps.getSubPicCtuTopLeftX(i);
    m_subPics[i].setFirstCTUInSubPic(firstCTU);
    uint32_t lastCTU = (sps.getSubPicCtuTopLeftY(i) + sps.getSubPicHeight(i) - 1) * m_picWidthInCtu + sps.getSubPicCtuTopLeftX(i) + sps.getSubPicWidth(i) - 1;
    m_subPics[i].setLastCTUInSubPic(lastCTU);

    uint32_t left = sps.getSubPicCtuTopLeftX(i) * m_ctuSize;
    m_subPics[i].setSubPicLeft(left);

    uint32_t right = std::min(m_picWidthInLumaSamples - 1, (sps.getSubPicCtuTopLeftX(i) + sps.getSubPicWidth(i)) * m_ctuSize - 1);
    m_subPics[i].setSubPicRight(right);

    m_subPics[i].setSubPicWidthInLumaSample(right - left + 1);

    uint32_t top = sps.getSubPicCtuTopLeftY(i) * m_ctuSize;
    m_subPics[i].setSubPicTop(top);

    uint32_t bottom = std::min(m_picHeightInLumaSamples - 1, (sps.getSubPicCtuTopLeftY(i) + sps.getSubPicHeight(i)) * m_ctuSize - 1);

    m_subPics[i].setSubPicHeightInLumaSample(bottom - top + 1);

    m_subPics[i].setSubPicBottom(bottom);

    m_subPics[i].clearCTUAddrList();

    if (m_numSlicesInPic == 1)
    {
      CHECK(getNumSubPics() != 1, "only one slice in picture, but number of subpic is not one");
      m_subPics[i].addAllCtusInPicToSubPic(0, getPicWidthInCtu(), 0, getPicHeightInCtu(), getPicWidthInCtu());
      m_subPics[i].setNumSlicesInSubPic(1);
    }
    else
    {
      int numSlicesInSubPic = 0;
      int idxLastSliceInSubpic = -1;
      int idxFirstSliceAfterSubpic = m_numSlicesInPic;
      for (int j = 0; j < m_numSlicesInPic; j++)
      {
        uint32_t ctu = m_sliceMap[j].getCtuAddrInSlice(0);
        uint32_t ctu_x = ctu % m_picWidthInCtu;
        uint32_t ctu_y = ctu / m_picWidthInCtu;
        if (ctu_x >= sps.getSubPicCtuTopLeftX(i) &&
          ctu_x < (sps.getSubPicCtuTopLeftX(i) + sps.getSubPicWidth(i)) &&
          ctu_y >= sps.getSubPicCtuTopLeftY(i) &&
          ctu_y < (sps.getSubPicCtuTopLeftY(i) + sps.getSubPicHeight(i)))
        {
          // add ctus in a slice to the subpicture it belongs to
          m_subPics[i].addCTUsToSubPic(m_sliceMap[j].getCtuAddrList());
          numSlicesInSubPic++;
          idxLastSliceInSubpic = j;
        }
        else if (idxFirstSliceAfterSubpic == m_numSlicesInPic && idxLastSliceInSubpic != -1)
        {
          idxFirstSliceAfterSubpic = j;
        }
      }
      CHECK( idxFirstSliceAfterSubpic < idxLastSliceInSubpic, "The signalling order of slices shall follow the coding order" );
      m_subPics[i].setNumSlicesInSubPic(numSlicesInSubPic);
    }
    m_subPics[i].setTreatedAsPicFlag(sps.getSubPicTreatedAsPicFlag(i));
    m_subPics[i].setloopFilterAcrossEnabledFlag(sps.getLoopFilterAcrossSubpicEnabledFlag(i));
  }
}

const SubPic& PPS::getSubPicFromPos(const Position& pos)  const
{
  for (int i = 0; i< m_numSubPics; i++)
  {
    if (m_subPics[i].isContainingPos(pos))
    {
      return m_subPics[i];
    }
  }
  return m_subPics[0];
}

const SubPic&  PPS::getSubPicFromCU(const CodingUnit& cu) const
{
  const Position lumaPos = cu.Y().valid()
                             ? cu.Y().pos()
                             : recalcPosition(cu.chromaFormat, cu.chType, ChannelType::LUMA, cu.block(cu.chType).pos());
  return getSubPicFromPos(lumaPos);
}

uint32_t PPS::getSubPicIdxFromSubPicId(const uint32_t subPicId) const
{
  for (int i = 0; i < m_numSubPics; i++)
  {
    if(m_subPics[i].getSubPicID() == subPicId)
    {
      return i;
    }
  }
  return 0;
}

void PPS::initRasterSliceMap(const std::vector<uint32_t> &numTilesInSlice )
{
  uint32_t tileIdx = 0;
  setNumSlicesInPic( (uint32_t) numTilesInSlice.size() );

  // allocate new memory for slice list
  CHECK(m_numSlicesInPic > MAX_SLICES, "Number of slices in picture exceeds valid range");
  m_sliceMap.resize( m_numSlicesInPic );

  for( uint32_t sliceIdx = 0; sliceIdx < numTilesInSlice.size(); sliceIdx++ )
  {
    m_sliceMap[sliceIdx].initSliceMap();
    m_sliceMap[sliceIdx].setSliceID( tileIdx );
    m_sliceMap[sliceIdx].setNumTilesInSlice( numTilesInSlice[sliceIdx] );
    for( uint32_t idx = 0; idx < numTilesInSlice[sliceIdx]; idx++ )
    {
      uint32_t tileX = tileIdx % getNumTileColumns();
      uint32_t tileY = tileIdx / getNumTileColumns();
      CHECK(tileY >= getNumTileRows(), "Number of tiles in slice exceeds the remaining number of tiles in picture");

      m_sliceMap[sliceIdx].addCtusToSlice(getTileColumnBd(tileX), getTileColumnBd(tileX + 1),
                                          getTileRowBd(tileY), getTileRowBd(tileY + 1),
                                          getPicWidthInCtu());
      tileIdx++;
    }
  }

  // check for valid raster-scan slice map
  checkSliceMap();
}

// check if slice map covers the entire picture without skipping or duplicating any CTU positions
void PPS::checkSliceMap()
{
  uint32_t i;
  std::vector<uint32_t>  ctuList, sliceList;
  uint32_t picSizeInCtu = getPicWidthInCtu() * getPicHeightInCtu();
  for( i = 0; i < m_numSlicesInPic; i++ )
  {
    sliceList = m_sliceMap[ i ].getCtuAddrList();
    ctuList.insert( ctuList.end(), sliceList.begin(), sliceList.end() );
  }
  CHECK( ctuList.size() < picSizeInCtu, "Slice map contains too few CTUs");
  CHECK( ctuList.size() > picSizeInCtu, "Slice map contains too many CTUs");
  std::sort( ctuList.begin(), ctuList.end() );
  for( i = 1; i < ctuList.size(); i++ )
  {
    CHECK( ctuList[i] > ctuList[i-1]+1, "CTU missing in slice map");
    CHECK( ctuList[i] == ctuList[i-1],  "CTU duplicated in slice map");
  }
}