Call func for each media in this.
The result value of func determines what happens to the media. func will be called with
this locked so no further actions on this can be performed from
func.
If func returns REMOVE, the media will be removed
from this.
If func returns KEEP, the media will remain in
this.
If func returns REF, the media will remain in
this but will also be added with an additional ref to the result List of this
function..
When func is null, REF
will be assumed for all media.
| this |
a Session |
| func |
a callback |
| user_data |
user data passed to |
|
a GList with all media for which |