All classes that implement MediaSourceEntityConstraintsInterface in Drupal 8
- class \Drupal\media_entity_slideshow\Plugin\media\Source\Slideshow implements MediaSourceEntityConstraintsInterface
- class \Drupal\media_test_source\Plugin\media\Source\TestWithConstraints implements MediaSourceEntityConstraintsInterface, MediaSourceFieldConstraintsInterface
- class \Drupal\varbase_media\Plugin\media\Source\VarbaseMediaGallery implements MediaSourceEntityConstraintsInterface