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>
And while doing that, have all the cases where we already include
qthelper.h simply use a define in that header file - but keep the two
other instances of the define where the C++ source don't need qthelper.h
otherwise.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This function was not used anywhere. Moreover, remove a few
unused includes from qthelper.h. Surprisingly, a number of users
of qthelper.h depend on these, so readd them at the appropriate
places.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
ExifTools (and probably other meta-data editors) modifies the
mvhd creation date, but leaves the individual creation dates
in the tracks unchanged. Therefore, use the mvhd atom.
Reported-by: Eric Tanguy <erictanguy2@orange.fr>
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
In analogy to the timestamp -> QDateTime conversion, create a
common function.
1) For symmetry with the opposite conversion.
2) To remove numerous inconsistencies.
3) To remove use of the deprecated QDateTime::toTime_t() function.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
Instead of having people treat latitude and longitude as separate
things, just add a 'location_t' data structure that contains both.
Almost all cases want to always act on them together.
This is really just prep-work for adding a few more locations that we
track: I want to add a entry/exit location to each dive (independent of
the dive site) because of how the Garmin Descent gives us the
information (and hopefully, some day, other dive computers too).
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
XMP is a media-metadata standard based on XML which may be used
across a variety of media formats. Some video-processing software
writes XMP data without updating the native metadata fields.
Therefore, we should aim at reading XMP metadata and give priority
of XMP data over native fields.
Pros:
- Support for *all* common media formats.
Cons:
- XML (complex, verbose, chaotic).
- Does not even come close to fulfilling its promise of being
well defined (see below).
Implement a simple XMP-parser using libxml2. Connect the XMP-parser to
the existing Quicktime/MP4 parser.
First problem encountered: According to the spec, XMP data supposed
to be put in the 'XMP_' atom. But for example exiftools instead
writes an 'uuid' atom with a special 16-byte uid. Implement both,
more options will probably follow.
Second problem: two versions of recording the creation date were found
1) The content of a <exif:DateTimeOriginal> tag.
2) The xmp::CreateDate attribute of a <rdf:Description> tag.
Here too, more versions are expected to surface and will have
to be supported in due course (with an obvious priority problem).
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
In metadata.cpp, replace a silly
"if (!memcmp(...) != 0)"
by the intended
"if (!memcmp(...))"
Obviously, both have the same effect. Fixes a warning.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
Whereas extraction of the dive-duration is trivial, AVIs don't seem
to have a standardized way of saving the creation time. This commit
implements support for two versions randomly found on the internet.
Additional version will follow if need arises. AVI seems not to be
a particular popular format for either vacation or professional
videographers.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
We want the duration of videos for two reasons:
- To display the duration of the video in the profile plot.
- To be able to determine which dive a video is closer to if the
start is not during a dive.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
Parse MP4s and related video files and extract the creation timestamp
from the "mdhd" (media header) atom.
Introduce helper function templates to extract arbitrary-length
unsigned integers in big-endian format from file or memory.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
Thus, metadata has to be only read once and the picture_load_exif_data()
function can be removed.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
