fix(studio): 消除 Finger 实时采集的帧排队

实时处理相机最新帧，并修复重复采样、数组快照和暂停恢复。通过共享模块及相关 Studio 测试。

shared/tests/test_finger_realtime.py

@@ -0,0 +1,135 @@
+"""Live Finger consumes current frames without a FIFO of pending work."""
+
+from types import SimpleNamespace
+
+import numpy as np
+import pytest
+
+from orisys_app_shared.acquisition import finger_worker as fw
+
+
+@pytest.mark.parametrize("is_file, expected", [(False, "serial"), (True, "stream")])
+def test_default_path_keeps_only_offline_processing_queued(
+    monkeypatch, is_file, expected
+):
+    worker = fw.FingerAcquisitionWorker()
+    paths = []
+    monkeypatch.setattr(worker, "_open_runtime", lambda *_: (None, None, None, is_file))
+    monkeypatch.setattr(worker, "_run_serial_loop", lambda *_: paths.append("serial"))
+    monkeypatch.setattr(
+        worker, "_run_stream_pipeline", lambda *_: paths.append("stream")
+    )
+    worker._run_session(1, None)
+    assert paths == [expected]
+
+
+def _live_loop(monkeypatch, *, sequences=None, compute_s=0.0, sink_s=0.0, pause=False):
+    clock = [10.0]
+    worker = fw.FingerAcquisitionWorker()
+    worker._session_id = 1
+    worker._mono_t0 = clock[0]
+    packets = []
+    resets = []
+    source = SimpleNamespace(
+        running=True, status=SimpleNamespace(last_seq=0, dropped_frames=7)
+    )
+    flow = np.zeros((8, 8, 2), np.float32)
+    depth = np.zeros((8, 8), np.float32)
+    tactile = SimpleNamespace(reset=lambda: resets.append(clock[0]))
+    runtime = SimpleNamespace(
+        tactile=tactile, capture_source=source, valid_mask=np.ones((8, 8), bool)
+    )
+    reads = [0]
+    paused_once = [False]
+
+    def read():
+        reads[0] += 1
+        if reads[0] > 40:
+            worker._stop.set()
+            return None
+        if sequences is not None:
+            seq = sequences[min(reads[0] - 1, len(sequences) - 1)]
+        else:
+            seq = 1 + int((clock[0] - 10.0) * 30 + 1e-6)
+        source.status.last_seq = seq
+        return SimpleNamespace(
+            image=np.full((8, 8, 3), seq, np.uint8),
+            sequence=seq,
+            host_mono_ns=int(clock[0] * 1e9),
+            host_utc_ns=int(clock[0] * 1e9),
+            media_time_ms=None,
+        )
+
+    def process(frame, **_):
+        flow.fill(frame[0, 0, 0])
+        depth.fill(frame[0, 0, 0])
+        return frame[:, :, 0]
+
+    def chain(_):
+        clock[0] += compute_s
+        if pause and not paused_once[0]:
+            paused_once[0] = True
+            worker.pause()
+        return depth, ""
+
+    def sleep(seconds):
+        clock[0] += max(seconds, 0.001)
+        if worker.paused:
+            worker.resume()
+
+    def sink(packet):
+        packets.append(packet)
+        clock[0] += sink_s
+        if len(packets) >= 3:
+            worker._stop.set()
+
+    runtime.read_source_stamped = read
+    runtime.process_frame = process
+    monkeypatch.setattr(
+        fw, "time", SimpleNamespace(perf_counter=lambda: clock[0], sleep=sleep)
+    )
+    monkeypatch.setattr(fw, "process_chain", chain)
+    monkeypatch.setattr(fw, "_contact_from_sensor", lambda *_, **__: None)
+    monkeypatch.setattr(
+        fw,
+        "read_forces_from_sensor",
+        lambda *_, **__: {
+            "normal_force": 1.0,
+            "shear_x": 2.0,
+            "shear_y": 3.0,
+            "normal_force_raw": 1.0,
+            "shear_x_raw": 2.0,
+            "shear_y_raw": 3.0,
+            "force_unit": "raw",
+            "force_calibrated": False,
+            "flow": flow,
+            "depth": depth,
+        },
+    )
+    worker.add_sink(sink)
+    worker._run_serial_loop(1, SimpleNamespace(config_ref=None), 0, runtime, False)
+    return packets, worker, resets
+
+
+def test_repeated_camera_frames_are_not_processed_or_recorded(monkeypatch):
+    packets, _, _ = _live_loop(monkeypatch, sequences=[1, 1, 2, 2, 3])
+    assert [p.source_frame_id for p in packets] == [1, 2, 3]
+    assert [p.frame_id for p in packets] == [0, 1, 2]
+
+
+def test_slow_compute_and_sink_take_current_input_without_a_backlog(monkeypatch):
+    packets, _, _ = _live_loop(monkeypatch, compute_s=0.07, sink_s=0.10)
+    assert [p.source_frame_id for p in packets] == [1, 6, 11]
+    for packet in packets:
+        assert packet.flow_frame_id == packet.depth_frame_id == packet.frame_id
+        assert np.all(packet.flow == packet.source_frame_id)
+        assert np.all(packet.depth == packet.source_frame_id)
+        assert packet.capture_dropped == 7
+
+
+def test_pause_during_compute_does_not_publish_and_resume_rebases(monkeypatch):
+    packets, _, resets = _live_loop(monkeypatch, compute_s=0.07, pause=True)
+    assert len(packets) == 3
+    assert packets[0].source_frame_id > 1
+    assert packets[0].frame_id == 0
+    assert len(resets) == 1