VideoReceiver: call stop and cleanup teeProbe

This fixes regular segfaults on exit for me.

Signed-off-by: Julian Oes <julian@oes.ch>

src/VideoReceiver/GstVideoReceiver.cc

@@ -63,6 +63,7 @@ GstVideoReceiver::GstVideoReceiver(QObject* parent)
 
 GstVideoReceiver::~GstVideoReceiver(void)
 {
+    stop();
     _slotHandler.shutdown();
 }
 
@@ -122,7 +123,7 @@ GstVideoReceiver::start(const QString& uri, unsigned timeout, int buffer)
 
         _lastSourceFrameTime = 0;
 
-        gst_pad_add_probe(pad, GST_PAD_PROBE_TYPE_BUFFER, _teeProbe, this, nullptr);
+        _teeProbeId = gst_pad_add_probe(pad, GST_PAD_PROBE_TYPE_BUFFER, _teeProbe, this, nullptr);
         gst_object_unref(pad);
         pad = nullptr;
 
@@ -287,6 +288,15 @@ GstVideoReceiver::stop(void)
 
     qCDebug(VideoReceiverLog) << "Stopping" << _uri;
 
+    if (_teeProbeId != 0) {
+        GstPad* sinkpad;
+        if ((sinkpad = gst_element_get_static_pad(_tee, "sink")) != nullptr) {
+            gst_pad_remove_probe(sinkpad, _teeProbeId);
+            sinkpad = nullptr;
+        }
+        _teeProbeId = 0;
+    }
+
     if (_pipeline != nullptr) {
         GstBus* bus;
 

src/VideoReceiver/GstVideoReceiver.h

@@ -148,7 +148,9 @@ protected:
     qint64              _lastSourceFrameTime;
     qint64              _lastVideoFrameTime;
     bool                _resetVideoSink;
-    gulong              _videoSinkProbeId;
+    gulong              _videoSinkProbeId = 0;
+
+    gulong              _teeProbeId = 0;
 
     QTimer              _watchdogTimer;