You could take a look at gtkpod for Linux/Mac, and the libraries it uses. More specifically the libgpod that gtkpod(and other programs) use.
API to copy music to iPod [duplicate]
문제
Is there an API to copy music (files on disk) to an iPod?
Any language will do, but preferably Java or python.
해결책 2
다른 팁
I believe the transfer protocol between iTunes and ipod is a closed one..and hence dont think there is a publicly available protocol.
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