You can do this if you have the development software, but Apple won't
approve an application that does this, and their official API wouldn't
support this usage.  They allow only a very limited set of uses for
video out.

This means you couldn't easily distribute such an application, but if
it was only for personal use then you'd probably be fine.

The graphics chip treats the displays seperately, so you can display
different things on them, and with the development software you can
display whatever you want on them.  I haven't fiddled with this much,
though, so it is likely to be more (or less) complex than that, but
this is what I've heard from those trying to do this.  They indicate
that if you want to go through the official API you have to navigate
quite a twisted route.  It only displays video through the apple
codec, and won't play video that is stored on the iphone itself - only
through an internet connection.  What they did was to create a simple
webserver in their iphone application, direct the video codec to
connect to their server, and they served the graphics as a movie.
They haven't attempted to pass it through the app store, though, and I
suspect it may receive extra scrutiy due to the way its circumventing
the no-video-from-onboard-storage-to-TV fence that appears to be in
place.  But they are generating the graphics in real time, not really
displaying video, so who knows.

Suffice to say, it's messy.

You can do it in a variety of other ways if you don't mind ignoring
Apple's rules and fences, and don't expect to be distributing the
application through the app store.

-Adam

On Fri, Apr 16, 2010 at 9:16 AM, Harold Hallikainen
<harold@hallikainen.org> wrote:
> Somewhat related to the iPad, iPhone, iPod discussion... I'm surprised
> that it appears that the video output on these (at least the iPod and
> iPhone) does not show screen video but, apparently, only video playback. I
> have an application where I'd like to drive an external display with an
> iPhone web browser. Does anyone know a way to do this? Is there maybe an
> application that redirects the main screen to external video?
>
> Thanks!
>
> Harold
>
>
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