LimeSDR input: start and stop stream before and after the read loop. Use actual number of samples for callback

plugins/samplesource/limesdrinput/limesdrinputthread.cpp

@@ -70,6 +70,12 @@ void LimeSDRInputThread::run()
     m_running = true;
     m_startWaiter.wakeAll();
 
+    if (LMS_StartStream(m_stream) < 0) {
+        qCritical("LimeSDRInputThread::run: could not start stream");
+    } else {
+        qDebug("LimeSDRInputThread::run: stream started");
+    }
+
     while (m_running)
     {
         if ((res = LMS_RecvStream(m_stream, (void *) m_buf, LIMESDR_BLOCKSIZE, &metadata, 1000)) < 0)
@@ -78,7 +84,14 @@ void LimeSDRInputThread::run()
             break;
         }
 
-        callback(m_buf, 2 * LIMESDR_BLOCKSIZE);
+        callback(m_buf, 2 * res);
+    }
+
+
+    if (LMS_StopStream(m_stream) < 0) {
+        qCritical("LimeSDRInputThread::run: could not stop stream");
+    } else {
+        qDebug("LimeSDRInputThread::run: stream stopped");
     }
 
     m_running = false;