Add realtime and systemtime getters. Preserve flags with operators. #52
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The purpose of this MR is to add a mean to get the timestamps of a given SMPTE Timecode. Two timebases are considered:
to_systemtime()
to_realtime()
NTSC framerates will return different values as the system time is not aligned to the wall-clock time. All others should return the exact same value.
DF 29.97:
NDF 29.97:
PAL 50:
I did not implement setters as I don't think there's a meaningful usage or need to them.
Hopefully this may help others understand better Timecodes running at different rates and the relations to the wall-clock time.
The second commit is to preserve the drop frame flag on elementary operations.