Method readNS

YUViewLib/src/parser/common/SubByteReader.cpp:225–252

}

std::tuple<uint64_t, std::string> SubByteReader::readNS(uint64_t maxVal)
{
  if (maxVal == 0)
    return {};

  // FloorLog2
  uint64_t floorVal;
  {
    auto     x = maxVal;
    unsigned s = 0;
    while (x != 0)
    {
      x = x >> 1;
      s++;
    }
    floorVal = s - 1;
  }

  auto w = floorVal + 1;
  auto m = (uint64_t(1) << w) - maxVal;

  auto [v, coding] = this->readBits(w - 1);
  if (v < m)
    return {v, coding};

  auto [extra_bit, extra_bit_coding] = this->readBits(1);
  return {(v << 1) - m + extra_bit, coding + extra_bit_coding};
}

std::tuple<int64_t, std::string> SubByteReader::readSU(unsigned nrBits)
{