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# Non-App-Specific Media Source Identifiers

Identifiers for media sources which do not correspond to apps. Used with [Load Options Keys](/documentation/MediaLibrary/load-options-keys).

## Topics

### Constants

[`let MLMediaSourceMoviesFolderIdentifier: String`](/documentation/MediaLibrary/MLMediaSourceMoviesFolderIdentifier)

The media source for the user’s Movies folder. This source provides data when [`MLMediaLoadFoldersKey`](/documentation/MediaLibrary/MLMediaLoadFoldersKey) is provided with the [`MLMediaLoadMoviesFolder`](/documentation/MediaLibrary/MLMediaLoadMoviesFolder) value.

[`let MLMediaSourceCustomFoldersIdentifier: String`](/documentation/MediaLibrary/MLMediaSourceCustomFoldersIdentifier)

The media source for custom folders. Currently, the only custom folder is the folder containing audio loops from Apple. This source provides data when [`MLMediaLoadFoldersKey`](/documentation/MediaLibrary/MLMediaLoadFoldersKey) is provided with the [`MLMediaLoadAppleLoops`](/documentation/MediaLibrary/MLMediaLoadAppleLoops) value.

[`let MLMediaSourceAppDefinedFoldersIdentifier: String`](/documentation/MediaLibrary/MLMediaSourceAppDefinedFoldersIdentifier)

The media source for app-defined folders. This identifies a media source created from a relative path inside the caller’s app bundle. This source provides data when [`MLMediaLoadAppFoldersKey`](/documentation/MediaLibrary/MLMediaLoadAppFoldersKey) is provided in the options.


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