libmtp is an implementation of Microsoft's Media Transfer Protocol (MTP)
in the form of a library suitable primarily for POSIX compliant
operating systems. We implement MTP Basic, the stuff proposed for
standardization. MTP Enhanced is for Windows only, if we implement
it, well that depends...

It was initially based on (forked from) the great libptp2 library
by Mariusz Woloszyn but has since been moved over to follow Marcus
Meissners and Hubert Figuere's libgphoto2 fork of libptp2 (or is libptp2
a fork of libgphoto?). The core implementation is identical to
libgphoto2, there is just a different API adapted to portable media
players.