3 files changed, 11 insertions, 26 deletions

diff --git a/tracker-pt/ftnoir_tracker_pt.cpp b/tracker-pt/ftnoir_tracker_pt.cpp
index f980c30d..b209a938 100644
--- a/tracker-pt/ftnoir_tracker_pt.cpp
+++ b/tracker-pt/ftnoir_tracker_pt.cpp
@@ -6,6 +6,7 @@
  * copyright notice and this permission notice appear in all copies.
  */
 
+#undef NDEBUG
 #include "ftnoir_tracker_pt.h"
 #include "pt-api.hpp"
 #include "cv/init.hpp"
@@ -15,6 +16,7 @@
 #include "compat/thread-name.hpp"
 #include "compat/qt-dpi.hpp"
 
+#include <cassert>
 #include <QHBoxLayout>
 #include <QDebug>
 #include <QFile>
@@ -40,7 +42,6 @@ Tracker_PT::~Tracker_PT()
     requestInterruption();
     wait();
 
-    QMutexLocker l(&camera_mtx);
     if (camera)
         camera->stop();
 }
@@ -50,22 +51,15 @@ bool Tracker_PT::check_camera()
     if (reopen_camera_flag)
     {
         reopen_camera_flag = false;
-        if (!camera || last_camera_name != s.camera_name)
-        {
-            // deadlock avoidance
 
-            decltype(camera) camera_;
-            {
-                QMutexLocker l(&camera_mtx);
-                camera_ = std::move(camera);
-            }
-            camera_ = traits->make_camera();
-            if (!camera_ || !camera_->start(s))
-                return false;
-            camera = std::move(camera_);
-            last_camera_name = s.camera_name;
-        }
+        camera = nullptr;
+        camera = traits->make_camera();
+        if (!camera || !camera->start(s))
+            return false;
     }
+    assert(camera);
+    if (progn(bool x = true; return open_camera_dialog_flag.compare_exchange_strong(x, false);))
+        camera->show_camera_settings();
     return true;
 }
 
@@ -82,7 +76,6 @@ void Tracker_PT::run()
         bool new_frame = false;
 
         {
-            QMutexLocker l(&camera_mtx);
             camera->set_fov(s.fov);
             std::tie(new_frame, info) = camera->get_frame(*frame);
         }
@@ -135,7 +128,6 @@ void Tracker_PT::run()
 module_status Tracker_PT::start_tracker(QFrame* video_frame)
 {
     {
-        QMutexLocker l(&camera_mtx);
         auto camera = traits->make_camera();
         if (!camera || !camera->start(s))
             return error(tr("Failed to open camera '%1'").arg(s.camera_name));
@@ -218,7 +210,6 @@ int Tracker_PT::get_n_points()
 
 bool Tracker_PT::get_cam_info(pt_camera_info& info)
 {
-    QMutexLocker l(&camera_mtx);
     bool ret = false;
 
     if (camera)
diff --git a/tracker-pt/ftnoir_tracker_pt.h b/tracker-pt/ftnoir_tracker_pt.h
index bb388d5c..416b0ebe 100644
--- a/tracker-pt/ftnoir_tracker_pt.h
+++ b/tracker-pt/ftnoir_tracker_pt.h
@@ -53,9 +53,6 @@ private:
 
     pointer<pt_runtime_traits> traits;
 
-    mutable QRecursiveMutex camera_mtx;
-    QString last_camera_name;
-
     PointTracker point_tracker;
 
     pt_settings s;
@@ -74,6 +71,7 @@ private:
     std::atomic<unsigned> point_count { 0 };
     std::atomic<bool> ever_success = false;
     std::atomic<bool> reopen_camera_flag = true;
+    std::atomic<bool> open_camera_dialog_flag = false;
     mutable QMutex center_lock, data_lock;
     point_filter filter{s};
 };
diff --git a/tracker-pt/ftnoir_tracker_pt_dialog.cpp b/tracker-pt/ftnoir_tracker_pt_dialog.cpp
index ce300e27..f71e13a5 100644
--- a/tracker-pt/ftnoir_tracker_pt_dialog.cpp
+++ b/tracker-pt/ftnoir_tracker_pt_dialog.cpp
@@ -235,11 +235,7 @@ void TrackerDialog_PT::set_camera_settings_available(const QString& /* camera_na
 void TrackerDialog_PT::show_camera_settings()
 {
     if (tracker)
-    {
-        QMutexLocker l(&tracker->camera_mtx);
-        if (tracker->camera)
-            tracker->camera->show_camera_settings();
-    }
+        tracker->open_camera_dialog_flag = true;
     else
         (void)video::show_dialog(s.camera_name);
 }