Added source_id property.

src/apollon/audio.py

@@ -72,6 +72,12 @@ class AudioFile:
         """Return (n_frames, n_channels)."""
         return self.n_frames, self.n_channels
 
+    """
+    @property
+    def source_id(self) -> SourceId:
+        """"""
+        return SourceId(self._path.name.split('.')[0], self.hash)
+    """
     def close(self) -> None:
         """Close the file."""
         self._file.close()