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media: load metadata and thumbnails of raw pictures using libraw

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The distinguished photographer shoots raw images. There is a
comprehensive library that can extract metadata and thumbnails
from these images. Let's use it if available.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2023-09-04 07:22:31 +02:00 • committed by Michael Keller
parent 02638d7c3e
commit 13d1188c41
6 changed files with 98 additions and 10 deletions
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35
core/metadata.cpp
View file

@ -7,6 +7,9 @@
#include <QFile>
#include <QFileInfo>
#include <QDateTime>
#ifdef LIBRAW_SUPPORT
#include <libraw/libraw.h>
#endif
// Weirdly, android builds fail owing to undefined UINT64_MAX
#ifndef UINT64_MAX
@ -528,6 +531,33 @@ static bool parseASF(QFile &f, metadata *metadata)
return false;
}
// Transform a (deg, min, sec) float triple into microdegrees
degrees_t degminsec_to_udeg(float a[3])
{
if (a[0] == 0.0 && a[1] == 0.0 && a[2] == 0.0)
return { 0 };
return { static_cast<int>(round(a[0] * 1'000'000.0 +
a[1] * (1'000'000.0/60.0) +
a[2] * (1'000'000.0/3600.0))) };
}
#ifdef LIBRAW_SUPPORT
static bool parseRaw(const char *fn, metadata *metadata)
{
LibRaw raw; // Might think about reusing that
// TODO: Convert filename to UTF-16 for windows
if (raw.open_file(fn) != LIBRAW_SUCCESS)
return false;
metadata->timestamp = raw.imgdata.other.timestamp;
metadata->location.lat = degminsec_to_udeg(raw.imgdata.other.parsed_gps.latitude);
metadata->location.lon = degminsec_to_udeg(raw.imgdata.other.parsed_gps.longitude);
return true;
}
#endif
mediatype_t get_metadata(const char *filename_in, metadata *data)
{
data->timestamp = 0;
@ -535,6 +565,11 @@ mediatype_t get_metadata(const char *filename_in, metadata *data)
data->location.lat.udeg = 0;
data->location.lon.udeg = 0;
#ifdef LIBRAW_SUPPORT
if (parseRaw(filename_in, data))
return MEDIATYPE_PICTURE;
#endif
QString filename = localFilePath(QString(filename_in));
QFile f(filename);
if (!f.open(QIODevice::ReadOnly))