How can I get the name of stream in VLC framework

[systest]

I'm writing a codec module for VLC.
How can I get the stream name/path(URL) from argv in VLC framework?

Which member in which struct describe it ?

[zorglub]

p_input->p_item->psz_name and
p_input->p_item->psz_uri

[systest]

many thanks~~~~~~~~~~