fixed studio dd02 live cannot work problem

shared/tests/test_stream_pipeline_acquisition.py

@@ -416,3 +416,32 @@ def test_a_failed_chain_marks_the_frame_rather_than_claiming_its_forces():
         assert packet.contact.centroid_uv_xy is None
     finally:
         _restore(saved)
+
+
+def test_the_finger_producer_reports_the_camera_rate(monkeypatch):
+    """The first live frame asks the producer for ``capture_fps``.
+
+    That call is what ended a finger session with
+    ``'_FingerProducer' object has no attribute 'capture_fps'``. A file has no
+    delivered-frame counter, so it reports nothing; a live source reports the
+    frames its counter advanced over the wall-clock between two reads.
+    """
+    from orisys_app_shared.acquisition import finger_worker
+
+    clock = {"t": 1000.0}
+    monkeypatch.setattr(finger_worker.time, "perf_counter", lambda: clock["t"])
+
+    file_source = types.SimpleNamespace(running=False, status=types.SimpleNamespace(last_seq=0))
+    file_runtime = types.SimpleNamespace(capture_source=file_source)
+    file_producer = finger_worker._FingerProducer(file_runtime, is_file=True)
+    assert file_producer.capture_fps() == 0.0
+
+    status = types.SimpleNamespace(last_seq=10, dropped_frames=0)
+    live = types.SimpleNamespace(running=True, status=status)
+    producer = finger_worker._FingerProducer(
+        types.SimpleNamespace(capture_source=live), is_file=False
+    )
+    assert producer.capture_fps() == 0.0
+    clock["t"] = 1001.0
+    producer.capture_seq = 40
+    assert producer.capture_fps() == pytest.approx(30.0)