Struct Stores 

pub struct Stores<'a> {
    pub manifest: &'a mut Manifest,
    pub albums: &'a mut BTreeMap<String, AlbumArt>,
    pub playlists: &'a mut BTreeMap<String, PlaylistState>,
}

The durable library state one run mutates: the per-clip manifest, plus the album and playlist art state that folder-level writes record against instead of the manifest.

Grouped for the same reason as Ports and ExecOptions: the three always travel together through the commit path, so one value threads them through rather than three adjacent &mut arguments.

Fields

manifest: &'a mut Manifest

albums: &'a mut BTreeMap<String, AlbumArt>

playlists: &'a mut BTreeMap<String, PlaylistState>