feat(src/components/camera/Camera): provide a protection to render in other thread

linphone-desktop/src/components/call/CallModel.cpp

@@ -143,7 +143,11 @@ void CallModel::acceptWithVideo () {
 }
 
 void CallModel::terminate () {
+  CoreManager *core = CoreManager::getInstance();
+
+  core->lockVideoRender();
   m_linphone_call->terminate();
+  core->unlockVideoRender();
 }
 
 void CallModel::transfer () {

linphone-desktop/src/components/camera/Camera.cpp

@@ -104,11 +104,23 @@ void CameraRenderer::render () {
   f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
   // Draw with ms filter.
-  MSFunctions *ms_functions = MSFunctions::getInstance();
+  {
+    QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
+
+    f->glClearColor(0.f, 0.f, 0.f, 0.f);
+    f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    CoreManager *core = CoreManager::getInstance();
+    MSFunctions *ms_functions = MSFunctions::getInstance();
 
-  ms_functions->bind(f);
-  m_camera->getCall()->getLinphoneCall()->oglRender(m_camera->m_is_preview);
-  ms_functions->bind(nullptr);
+    core->lockVideoRender();
+
+    ms_functions->bind(f);
+    m_camera->getCall()->getLinphoneCall()->oglRender(m_camera->m_is_preview);
+    ms_functions->bind(nullptr);
+
+    core->unlockVideoRender();
+  }
 
   // Synchronize opengl calls with QML.
   if (m_window)

linphone-desktop/src/components/core/CoreManager.cpp

@@ -68,7 +68,9 @@ void CoreManager::init (QObject *parent, const QString &config_path) {
 
     QObject::connect(
       timer, &QTimer::timeout, m_instance, []() {
+        m_instance->m_mutex_video_render.lock();
         m_instance->m_core->iterate();
+        m_instance->m_mutex_video_render.unlock();
       }
     );
   }

linphone-desktop/src/components/core/CoreManager.hpp

@@ -27,8 +27,11 @@
 #include "../contacts/ContactsListModel.hpp"
 #include "../settings/SettingsModel.hpp"
 #include "../sip-addresses/SipAddressesModel.hpp"
+
 #include "CoreHandlers.hpp"
 
+#include <QMutex>
+
 // =============================================================================
 
 class QTimer;
@@ -49,6 +52,18 @@ public:
     return m_handlers;
   }
 
+  // ---------------------------------------------------------------------------
+  // Video render lock.
+  // ---------------------------------------------------------------------------
+
+  void lockVideoRender () {
+    m_mutex_video_render.lock();
+  }
+
+  void unlockVideoRender () {
+    m_mutex_video_render.unlock();
+  }
+
   // ---------------------------------------------------------------------------
   // Singleton models.
   // ---------------------------------------------------------------------------
@@ -102,6 +117,8 @@ private:
 
   QTimer *m_cbs_timer;
 
+  QMutex m_mutex_video_render;
+
   static CoreManager *m_instance;
 };