Sebastian, I'm not sure such extension would be very useful in the camera - the camera resources are limited, so "normal" Exif headers are appended to the outgoing frames at the very last moment when the frame is being sent out. Internally camera maintains just the frame-variable part of Exif data, combining it with the template like printf() fills variable fields in format string with the actual data.
( see also http://www.mail-archive.com/[email protected]/msg00281.html ) The camera handling of Exif data is built around that "condensed" data, so the standard Exif processing software would not be able to read it, such software is more useful on the host computer. As for cross-compiling additional modules - we do not have instructions and the process is not fully automatic. I can only suggest you to look how other extensions are cross-compiled and use those as examples. Andrey
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