Code gen for avfoundation and what paths to use

I'm trying to generate code for the ios avfoundation headers.

I'm uncertain what paths to pass to the codegen tool:

The xcode project has a Frameworks directory with a large no. of frameworks many of which are dependant on each other.

Can I just pass a single framework directory?

e.g.

```
codegen -o ios_dart AVFoundation.framework
```

Do then just look at imports to see what other frameworks should be generated or am I better of just generating code for the entire set of frameworks?

Some guidance on the conversion process in the doco might be useful.