Method decodeMetaDataInternal

src/librawspeed/decoders/CrwDecoder.cpp:123–219

}

void CrwDecoder::decodeMetaDataInternal(const CameraMetaData* meta) {
  int iso = 0;
  mRaw->cfa.setCFA(iPoint2D(2,2), CFA_RED, CFA_GREEN, CFA_GREEN, CFA_BLUE);
  vector<const CiffIFD*> data = mRootIFD->getIFDsWithTag(CIFF_MAKEMODEL);
  if (data.empty())
    ThrowRDE("Model name not found");
  vector<string> makemodel = data[0]->getEntry(CIFF_MAKEMODEL)->getStrings();
  if (makemodel.size() < 2)
    ThrowRDE("wrong number of strings for make/model");
  string make = makemodel[0];
  string model = makemodel[1];
  string mode;

  if (mRootIFD->hasEntryRecursive(CIFF_SHOTINFO)) {
    const CiffEntry* shot_info = mRootIFD->getEntryRecursive(CIFF_SHOTINFO);
    if (shot_info->type == CIFF_SHORT && shot_info->count >= 2) {
      // os << exp(canonEv(value.toLong()) * log(2.0)) * 100.0 / 32.0;
      uint16_t iso_index = shot_info->getU16(2);
      iso = expf(canonEv(static_cast<int64_t>(iso_index)) * logf(2.0)) *
            100.0F / 32.0F;
    }
  }

  // Fetch the white balance
  try{
    if (mRootIFD->hasEntryRecursive(static_cast<CiffTag>(0x0032))) {
      const CiffEntry* wb =
          mRootIFD->getEntryRecursive(static_cast<CiffTag>(0x0032));
      if (wb->type == CIFF_BYTE && wb->count == 768) {
        // We're in a D30 file, values are RGGB
        // This, not 0x102c tag, should be used.
        std::array<uint16_t, 4> wbMuls{
            {wb->getU16(36), wb->getU16(37), wb->getU16(38), wb->getU16(39)}};
        for (const auto& mul : wbMuls) {
          if (0 == mul)
            ThrowRDE("WB coeffient is zero!");
        }

        mRaw->metadata.wbCoeffs[0] = static_cast<float>(1024.0 / wbMuls[0]);
        mRaw->metadata.wbCoeffs[1] =
            static_cast<float>((1024.0 / wbMuls[1]) + (1024.0 / wbMuls[2])) /
            2.0F;
        mRaw->metadata.wbCoeffs[2] = static_cast<float>(1024.0 / wbMuls[3]);
      } else if (wb->type == CIFF_BYTE && wb->count > 768) { // Other G series and S series cameras
        // correct offset for most cameras
        int offset = hints.get("wb_offset", 120);

        std::array<uint16_t, 2> key = {{0x410, 0x45f3}};
        if (! hints.has("wb_mangle"))
          key[0] = key[1] = 0;

        offset /= 2;
        mRaw->metadata.wbCoeffs[0] =
            static_cast<float>(wb->getU16(offset + 1) ^ key[1]);
        mRaw->metadata.wbCoeffs[1] =
            static_cast<float>(wb->getU16(offset + 0) ^ key[0]);
        mRaw->metadata.wbCoeffs[2] =
            static_cast<float>(wb->getU16(offset + 2) ^ key[0]);