Loading media in a separate thread to retrieve sizeHEADmaster

An additional fix for tdf#170681. It loads media into QMediaPlayer in a separate
thread to retrieve the size in the getPreferredPlayerWindowSize() function.

The implementation is not the best - in the separate thread, the media
is reloaded, but alas, this is the best I could achieve.
Moving QMediaPlayer between threads does not move the
QMediaPlayer backend (ffmpeg), and after loading, the
player remains "dead." Creating two players in two different
threads and then transferring the loaded buffer between them
also didn't work. There is currently no way to read metadata
without loading the file into QMediaPlayer. At the moment,
I believe it's not possible to do better within Qt's
limitations. If the QMediaPlayer issues are resolved,
the solution can be improved.
https://qt-project.atlassian.net/browse/QTBUG-125865
https://qt-project.atlassian.net/browse/QTBUG-128853

Change-Id: I1d6efe0819b299427536be833ec7c4262e894f3d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/203390
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

0 files changed, 0 insertions, 0 deletions