QString MetaEngine::Private::convertCommentValue(const Exiv2::Exifdatum& exifDatum) const
{
try
{
std::string comment;
std::string charset;
comment = exifDatum.toString();
// libexiv2 will prepend "charset=\"SomeCharset\" " if charset is specified
// Before conversion to QString, we must know the charset, so we stay with std::string for a while
if (comment.length() > 8 && comment.substr(0, 8) == "charset=")
{
// the prepended charset specification is followed by a blank
std::string::size_type pos = comment.find_first_of(' ');
if (pos != std::string::npos)
{
// extract string between the = and the blank
charset = comment.substr(8, pos-8);
// get the rest of the string after the charset specification
comment = comment.substr(pos+1);
}
}
if (charset == "\"Unicode\"")
{
return QString::fromUtf8(comment.data());
}
else if (charset == "\"Jis\"")
{
QTextCodec* const codec = QTextCodec::codecForName("JIS7");
return codec->toUnicode(comment.c_str());
}
else if (charset == "\"Ascii\"")
{
return QString::fromLatin1(comment.c_str());
}
else
{
return detectEncodingAndDecode(comment);
}
}
catch( Exiv2::Error& e )
{
printExiv2ExceptionError(QString::fromLatin1("Cannot convert Comment using Exiv2 "), e);
}
catch(...)
{
qCCritical(DIGIKAM_METAENGINE_LOG) << "Default exception from Exiv2";
}
return QString();
}
char* ReadExifData(const char* File, double* Lat, double* Long, double* Elev, int* IncludesGPS)
{
// This function varies in that it reads
// much more data than the last, specifically
// for display purposes. For the GUI version.
// Open and read the file.
Exiv2::Image::AutoPtr Image;
try {
Image = Exiv2::ImageFactory::open(File);
} catch (Exiv2::Error e) {
DEBUGLOG("Failed to open file %s.\n", File);
return NULL;
}
Image->readMetadata();
if (Image.get() == NULL)
{
DEBUGLOG("Failed to read file %s %s.\n",
File, Exiv2::strError().c_str());
return NULL;
}
Exiv2::ExifData &ExifRead = Image->exifData();
// Read the tag out.
Exiv2::Exifdatum& Tag = ExifRead["Exif.Photo.DateTimeOriginal"];
// Check that the tag is not blank.
std::string Value = Tag.toString();
if (Value.length() == 0)
{
// No date/time stamp.
// Not good.
// Just return - above us will handle it.
return NULL;
}
// Copy the tag and return that.
char* Copy = strdup(Value.c_str());
// Check if we have GPS tags.
Exiv2::Exifdatum GPSData = ExifRead["Exif.GPSInfo.GPSVersionID"];
Value = GPSData.toString();
if (Value.length() == 0)
{
// No GPS data.
// Just return.
*IncludesGPS = 0;
} else {
// Seems to include GPS data...
*IncludesGPS = 1;
// Read it out and send it up!
// What we are trying to do here is convert the
// three rationals:
// dd/v mm/v ss/v
// To a decimal
// dd.dddddd...
// dd/v is easy: result = dd/v.
// mm/v is harder:
// mm
// -- / 60 = result.
// v
// ss/v is sorta easy.
// ss
// -- / 3600 = result
// v
// Each part is added to the final number.
Exiv2::URational RatNum;
GPSData = ExifRead["Exif.GPSInfo.GPSLatitude"];
if (GPSData.count() < 3)
*Lat = nan("invalid");
else {
RatNum = GPSData.toRational(0);
*Lat = (double)RatNum.first / (double)RatNum.second;
RatNum = GPSData.toRational(1);
*Lat = *Lat + (((double)RatNum.first / (double)RatNum.second) / 60);
RatNum = GPSData.toRational(2);
*Lat = *Lat + (((double)RatNum.first / (double)RatNum.second) / 3600);
GPSData = ExifRead["Exif.GPSInfo.GPSLatitudeRef"];
if (strcmp(GPSData.toString().c_str(), "S") == 0)
{
// Negate the value - Western Hemisphere.
*Lat = -*Lat;
}
}
GPSData = ExifRead["Exif.GPSInfo.GPSLongitude"];
if (GPSData.count() < 3)
*Long = nan("invalid");
else {
RatNum = GPSData.toRational(0);
*Long = (double)RatNum.first / (double)RatNum.second;
RatNum = GPSData.toRational(1);
*Long = *Long + (((double)RatNum.first / (double)RatNum.second) / 60);
RatNum = GPSData.toRational(2);
*Long = *Long + (((double)RatNum.first / (double)RatNum.second) / 3600);
GPSData = ExifRead["Exif.GPSInfo.GPSLongitudeRef"];
if (strcmp(GPSData.toString().c_str(), "W") == 0)
{
// Negate the value - Western Hemisphere.
*Long = -*Long;
}
}
// Finally, read elevation out. This one is simple.
GPSData = ExifRead["Exif.GPSInfo.GPSAltitude"];
if (GPSData.count() < 1)
*Elev = nan("invalid");
else {
RatNum = GPSData.toRational(0);
*Elev = (double)RatNum.first / (double)RatNum.second;
}
// Is the altitude below sea level? If so, negate the value.
GPSData = ExifRead["Exif.GPSInfo.GPSAltitudeRef"];
if (GPSData.count() >= 1 && GPSData.toLong() == 1)
{
// Negate the elevation.
*Elev = -*Elev;
}
}
// Now return, passing a pointer to the date string.
return Copy; // It's up to the caller to free this.
}
//! Returns true if IFD id matches.
bool operator()(const Exiv2::Exifdatum& md) const { return ifdId_ == md.ifdId(); }
