DecLib.cpp

      }

    case NAL_UNIT_EOB:
      return false;

#if JVET_O0179
    case NAL_UNIT_RESERVED_IRAP_VCL_12:
    case NAL_UNIT_RESERVED_IRAP_VCL_13:
#else
    case NAL_UNIT_RESERVED_VCL_12:
    case NAL_UNIT_RESERVED_VCL_13:
#endif
    case NAL_UNIT_RESERVED_VCL_14:
    case NAL_UNIT_RESERVED_VCL_15:
      msg( NOTICE, "Note: found reserved VCL NAL unit.\n");
      xParsePrefixSEIsForUnknownVCLNal();
      return false;
#if JVET_O0179
    case NAL_UNIT_RESERVED_VCL_4:
    case NAL_UNIT_RESERVED_VCL_5:
    case NAL_UNIT_RESERVED_VCL_6:
    case NAL_UNIT_RESERVED_VCL_7:
    case NAL_UNIT_RESERVED_NVCL_26:
    case NAL_UNIT_RESERVED_NVCL_27:
#else
    case NAL_UNIT_RESERVED_NVCL_5:
    case NAL_UNIT_RESERVED_NVCL_6:
    case NAL_UNIT_RESERVED_NVCL_7:
    case NAL_UNIT_RESERVED_NVCL_21:
    case NAL_UNIT_RESERVED_NVCL_22:
    case NAL_UNIT_RESERVED_NVCL_23:
#endif
      msg( NOTICE, "Note: found reserved NAL unit.\n");
      return false;
    case NAL_UNIT_UNSPECIFIED_28:
    case NAL_UNIT_UNSPECIFIED_29:
    case NAL_UNIT_UNSPECIFIED_30:
    case NAL_UNIT_UNSPECIFIED_31:
      msg( NOTICE, "Note: found unspecified NAL unit.\n");
      return false;
    default:
      THROW( "Invalid NAL unit type" );
      break;
  }

  return false;
}


/** Function for checking if picture should be skipped because of random access. This function checks the skipping of pictures in the case of -s option random access.
 *  All pictures prior to the random access point indicated by the counter iSkipFrame are skipped.
 *  It also checks the type of Nal unit type at the random access point.
 *  If the random access point is CRA/CRANT/BLA/BLANT, TFD pictures with POC less than the POC of the random access point are skipped.
 *  If the random access point is IDR all pictures after the random access point are decoded.
 *  If the random access point is none of the above, a warning is issues, and decoding of pictures with POC
 *  equal to or greater than the random access point POC is attempted. For non IDR/CRA/BLA random
 *  access point there is no guarantee that the decoder will not crash.
 */
bool DecLib::isRandomAccessSkipPicture( int& iSkipFrame, int& iPOCLastDisplay )
{
  if (iSkipFrame)
  {
    iSkipFrame--;   // decrement the counter
    return true;
  }
  else if (m_pocRandomAccess == MAX_INT) // start of random access point, m_pocRandomAccess has not been set yet.
  {
    if (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_CRA )
    {
      // set the POC random access since we need to skip the reordered pictures in the case of CRA/CRANT/BLA/BLANT.
      m_pocRandomAccess = m_apcSlicePilot->getPOC();
    }
    else if ( m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_IDR_W_RADL || m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_IDR_N_LP )
    {
      m_pocRandomAccess = -MAX_INT; // no need to skip the reordered pictures in IDR, they are decodable.
    }
    else
    {
      if(!m_warningMessageSkipPicture)
      {
        msg( WARNING, "\nWarning: this is not a valid random access point and the data is discarded until the first CRA picture");
        m_warningMessageSkipPicture = true;
      }
      return true;
    }
  }
  // skip the reordered pictures, if necessary
  else if (m_apcSlicePilot->getPOC() < m_pocRandomAccess && (m_apcSlicePilot->getNalUnitType() == NAL_UNIT_CODED_SLICE_RASL))
  {
    iPOCLastDisplay++;
    return true;
  }
  // if we reach here, then the picture is not skipped.
  return false;
}




//! \}