What to do if the source name of a package changes

[Gregor Jasny <gjasny@googlemail.com>]

Hello,

I'm the maintainer of the libv4l package. It produces two binary
packages: libv4l-0 and libv4l-dev.

With the latest release upstream decided to rename it to v4l-utils and
add some utilities.

To be consistent with upstream I changes the package source name to v4l-utils.
But what actions do I have to take to take to replace libv4l with
v4l-utils in the archive?

Thanks,
Gregor