--- a/src/pyams_media/interfaces/__init__.py	Mon Feb 18 16:12:44 2019 +0100
+++ b/src/pyams_media/interfaces/__init__.py	Mon Sep 28 15:24:32 2020 +0200
@@ -105,6 +105,9 @@
     def has_conversion(self, formats):
         """Check if one of given formats is available in conversions"""
 
+    def get_sources(self, request):
+        """Get media sources in JSON format"""
+
 
 class IMediaConversion(Interface):
     """Marker interface for already converted media files"""