How do you filter get_media_items by mime type in a custom media upload tab?

Question

I've gotten as far as creating my new tab and getting it to show up and I've taken a copy of the gallery screen (I'm making an audio plugin with a playlist feature). The list of media items shows up fine but I can only get it to show just the audio files when I don't pass a post ID into the get_media_items() function like in the media library tab.

How I can retrieve a media items list using get_media_items() where the post_parent field is set and the post_mime_type matches 'audio'?

Answer 1

The answer ended up being to copy that function and filter the results it returned. It's hacky but until there are more hooks/filters available in that section of the core there's no better way :(