TComChromaFormat.cpp

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/* 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) 2010-2017, 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.
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 *    be used to endorse or promote products derived from this software without
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 *
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 */


#include "TComChromaFormat.h"
#include "TComPic.h"
#include "TComDataCU.h"
#include "TComTrQuant.h"
#include "TComTU.h"




//----------------------------------------------------------------------------------------------------------------------

InputColourSpaceConversion stringToInputColourSpaceConvert(const std::string &value, const Bool bIsForward)
{
  if (value.empty() || value=="UNCHANGED")
  {
    return IPCOLOURSPACE_UNCHANGED;
  }
  if (bIsForward)
  {
    if (value=="YCbCrtoYYY")
    {
      return IPCOLOURSPACE_YCbCrtoYYY;
    }
    if (value=="YCbCrtoYCrCb")
    {
      return IPCOLOURSPACE_YCbCrtoYCrCb;
    }
    if (value=="RGBtoGBR")
    {
      return IPCOLOURSPACE_RGBtoGBR;
    }
  }
  else
  {
    if (value=="YCrCbtoYCbCr")
    {
      return IPCOLOURSPACE_YCbCrtoYCrCb;
    }
    if (value=="GBRtoRGB")
    {
      return IPCOLOURSPACE_RGBtoGBR;
    }
  }
  return NUMBER_INPUT_COLOUR_SPACE_CONVERSIONS;
}

std::string getListOfColourSpaceConverts(const Bool bIsForward)
{
  if (bIsForward)
  {
    return "UNCHANGED, YCbCrtoYCrCb, YCbCrtoYYY or RGBtoGBR";
  }
  else
  {
    return "UNCHANGED, YCrCbtoYCbCr or GBRtoRGB";
  }
}


//----------------------------------------------------------------------------------------------------------------------

Void getTUEntropyCodingParameters(      TUEntropyCodingParameters &result,
                                        TComTU                    &rTu,
                                  const ComponentID                component)
{
  //------------------------------------------------

  //set the local parameters

        TComDataCU    *const pcCU            = rTu.getCU();
  const TComRectangle &      area            = rTu.getRect(component);
  const UInt                 uiAbsPartIdx    = rTu.GetAbsPartIdxTU(component);
  const UInt                 log2BlockWidth  = g_aucConvertToBit[area.width]  + 2;
  const UInt                 log2BlockHeight = g_aucConvertToBit[area.height] + 2;
  const ChannelType          channelType     = toChannelType(component);

  result.scanType = COEFF_SCAN_TYPE(pcCU->getCoefScanIdx(uiAbsPartIdx, area.width, area.height, component));

  //------------------------------------------------

  //set the group layout

  result.widthInGroups  = area.width  >> MLS_CG_LOG2_WIDTH;
  result.heightInGroups = area.height >> MLS_CG_LOG2_HEIGHT;

  //------------------------------------------------

  //set the scan orders

  const UInt log2WidthInGroups  = g_aucConvertToBit[result.widthInGroups  * 4];
  const UInt log2HeightInGroups = g_aucConvertToBit[result.heightInGroups * 4];

  result.scan   = g_scanOrder[ SCAN_GROUPED_4x4 ][ result.scanType ][ log2BlockWidth    ][ log2BlockHeight    ];
  result.scanCG = g_scanOrder[ SCAN_UNGROUPED   ][ result.scanType ][ log2WidthInGroups ][ log2HeightInGroups ];

  //------------------------------------------------

  //set the significance map context selection parameters

  if (pcCU->getSlice()->getSPS()->getSpsRangeExtension().getTransformSkipContextEnabledFlag()
      && (pcCU->getCUTransquantBypass(uiAbsPartIdx) || (pcCU->getTransformSkip(uiAbsPartIdx, component) != 0)))
  {
    result.firstSignificanceMapContext = significanceMapContextSetStart[channelType][CONTEXT_TYPE_SINGLE];
  }
  else
  {
    if ((area.width == 4) && (area.height == 4))
    {
      result.firstSignificanceMapContext = significanceMapContextSetStart[channelType][CONTEXT_TYPE_4x4];
    }
    else if ((area.width == 8) && (area.height == 8))
    {
      result.firstSignificanceMapContext = significanceMapContextSetStart[channelType][CONTEXT_TYPE_8x8];
      if (result.scanType != SCAN_DIAG)
      {
        result.firstSignificanceMapContext += nonDiagonalScan8x8ContextOffset[channelType];
      }
    }
    else
    {
      result.firstSignificanceMapContext = significanceMapContextSetStart[channelType][CONTEXT_TYPE_NxN];
    }
  }

  //------------------------------------------------
}


//----------------------------------------------------------------------------------------------------------------------