Add lazy piano transcription and optional leased server worker

scripts/piano/test_worker.py

@@ -0,0 +1,18 @@
+import unittest
+from worker import compact
+
+
+class CompactNotesTest(unittest.TestCase):
+    def test_hand_split_and_velocity(self):
+        notes = compact([{'midi_note': 48, 'onset_time': 1.23456, 'offset_time': 1.78, 'velocity': 85}, {'midi_note': 60, 'onset_time': 2, 'offset_time': 3, 'velocity': 200}])
+        self.assertEqual(notes[0], {'pitch': 48, 'start': 1.235, 'end': 1.78, 'velocity': 85, 'hand': 'left'})
+        self.assertEqual(notes[1]['hand'], 'right')
+        self.assertEqual(notes[1]['velocity'], 127)
+
+    def test_empty_or_zero_duration(self):
+        self.assertEqual(compact([]), [])
+        self.assertEqual(compact([{'midi_note': 60, 'onset_time': 2, 'offset_time': 2, 'velocity': 85}]), [])
+
+
+if __name__ == '__main__':
+    unittest.main()