get a right capture time for logic with loop mode

DSView/pv/sigsession.cpp

@@ -104,6 +104,7 @@ namespace pv
         _is_triged = false;
         _dso_status_valid = false;
         _is_task_end = false;
+        _capture_work_time = 0;
 
         _data_list.push_back(new SessionData());
         _data_list.push_back(new SessionData());
@@ -1476,7 +1477,7 @@ namespace pv
                 if (mode == LOGIC){
                     auto logic_data = _capture_data->get_logic();
                     if (is_loop_mode() && logic_data->get_loop_offset() > 0){
-                        uint64_t milliseconds = logic_data->get_ring_sample_count() / 1000000;
+                        uint64_t milliseconds = _capture_work_time / 1000000;
                         QDateTime sessionTime = QDateTime::currentDateTime();
                         sessionTime = sessionTime.addMSecs(-milliseconds);
                         set_session_time(sessionTime);

DSView/pv/sigsession.h

@@ -455,6 +455,10 @@ public:
 
     void ProcessPowerEvent(bool bEnterSleep);
 
+    inline void set_capture_work_time(uint64_t tm){
+        _capture_work_time = tm;
+    }
+
 private:
     void set_cur_samplelimits(uint64_t samplelimits);
     void set_cur_snap_samplerate(uint64_t samplerate);
@@ -623,6 +627,7 @@ private:
     IDecoderPannel  *_decoder_pannel;
     sr_status       _dso_status;
     bool            _dso_status_valid;
+    uint64_t        _capture_work_time;
    
 private:
 	// TODO: This should not be necessary. Multiple concurrent

DSView/pv/toolbars/samplingbar.cpp

@@ -792,6 +792,8 @@ namespace pv
                                                              _sample_rate.currentIndex())
                                                  .value<uint64_t>();
 
+                _session->set_capture_work_time((uint64_t)sample_duration);
+
                 if (_device_agent->have_instance())
                 {
                     if (sample_rate != _device_agent->get_sample_rate())