Hi,
I'm the original author of the audio code. I've had a look at what's
there now, and the GPX reading code has changed quite a lot since I
looked at it, but it seems to me like it is not associating links with
trackpoints any more. But also trackpoints and waypoints are handled by
the same piece of code, so I'm rather puzzled that a link element would
work on one and not the other. I'd have to go in with a debugger to be
sure what's happening as I can't really follow my way round the code any
more without refamiliarising myself as it has changed so much.
Anyway, as you say, that's all rather unnecessary. Providing the
"Modified times of audio files" preference is on, when you Import Audio
by right clicking on a GPX layer you can select multiple files and it
will put audio buttons at the times for each clip selected.
Note that it uses the *modified* times of the files and these are
assumed to be the time at the end of the recording (because that is
presumably the last time the file was modified, for obvious reasons),
though the button is displayed in the GPX track at the start of the
recording.
Regarding time zones, if the GPX doesn't explicitly say its times are in
some time zone it appears to assume UTC (which is what the GPX spec
says; though strictly speaking it is invalid GPX without the explicit
'Z' in the ISO format date, but as lots of GPS units and software doen't
put the 'Z' in, it is sensible to assume it).
For file time stamps it shouldn't matter about time zone, as the time
stamp is stored in UTC in the operating system and time zone of the
machine is only used to display times, e.g. in a file properties dialog.
However, if you are using a recorder which doesn't understand time zones
at all, then you'd have to adjust for this before import to JOSM. But I
imagine this would be obvious as the times of the files would show up
wrongly in File Properties too, for the same reason JOSM would get it wrong.
David
On 23/10/2010 22:08, activityworkshop wrote:
Hi all,
First of all, thanks for JOSM, it's a great tool for contributing to OSM.
I have a few questions regarding the audio functionality of JOSM and the
various ways it can be used. I got these questions because I'm the
author of the "Prune" tool which is used by some people to prepare their
GPS tracks before importing into JOSM.
Prune can already figure out the locations of photos using their
timestamps and a corresponding gps track, and I received the following
feature request for Prune to do the same for audio files:
http://sourceforge.net/projects/prune-gps/forums/forum/682167/topic/3746079
I've now got the basics working (although it's not released yet), but I
wanted to run things past you josm-devs first. I noticed that if the
points attached to the audio files are track points, JOSM seems to
ignore the audio information. If I convert them to waypoints in Prune
and then re-export the gpx file, then JOSM shows the audio files
properly. So my first question is, is this intentional behaviour that
only audio files connected to waypoints are recognised? Is this likely
to change in the future? It's awkward for me because when Prune
associates the audio file with a point, it's almost 100% certain going
to be a track point (ie, a point without a name). Converting all the
audio points into waypoints is then a pain.
While looking around JOSM's help files, it then strikes me that you
josm-devs have already done a lot of work on this audio synchronization
problem, and maybe all this audio stuff doesn't even need to be in Prune
at all. If you can do all this in JOSM already, then there's no reason
to do the same in Prune only to load the files into JOSM anyway. What do
you think?
Unfortunately I wasn't able to figure out how to properly synchronize my
audio files within JOSM, because I couldn't work out how to apply my
timezone offset (GPS track in UTC, audio files in local time). Is this a
feature that's planned, or is the idea to always reset the audio
recorder (or camera) clock to UTC?
I'd be very interested to hear your thoughts on this!
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