viewer: re-render both video and audio if parameters change

app/render/videoparams.cpp

@@ -77,6 +77,26 @@ const RenderMode::Mode &VideoRenderingParams::mode() const
   return mode_;
 }
 
+bool VideoRenderingParams::operator==(const VideoRenderingParams &rhs) const
+{
+  return width() == rhs.width()
+      && height() == rhs.height()
+      && time_base() == rhs.time_base()
+      && format() == rhs.format()
+      && mode() == rhs.mode()
+      && divider() == rhs.divider();
+}
+
+bool VideoRenderingParams::operator!=(const VideoRenderingParams &rhs) const
+{
+  return width() != rhs.width()
+      || height() != rhs.height()
+      || time_base() != rhs.time_base()
+      || format() != rhs.format()
+      || mode() != rhs.mode()
+      || divider() != rhs.divider();
+}
+
 void VideoRenderingParams::calculate_effective_size()
 {
   effective_width_ = width() / divider_;

app/render/videoparams.h

@@ -36,6 +36,9 @@ public:
   const PixelFormat::Format& format() const;
   const RenderMode::Mode& mode() const;
 
+  bool operator==(const VideoRenderingParams& rhs) const;
+  bool operator!=(const VideoRenderingParams& rhs) const;
+
 private:
   void calculate_effective_size();
 

app/widget/viewer/viewer.cpp

@@ -295,14 +295,23 @@ void ViewerWidget::UpdateRendererParameters()
 
   RenderMode::Mode render_mode = RenderMode::kOffline;
 
-  video_renderer_->SetParameters(VideoRenderingParams(GetConnectedNode()->video_params(),
+  VideoRenderingParams vparam(GetConnectedNode()->video_params(),
                               PixelService::instance()->GetConfiguredFormatForMode(render_mode),
                               render_mode,
-                                                      divider_));
-  audio_renderer_->SetParameters(AudioRenderingParams(GetConnectedNode()->audio_params(),
-                                                      SampleFormat::GetConfiguredFormatForMode(render_mode)));
+                              divider_);
 
+  if (video_renderer_->params() != vparam) {
+    video_renderer_->SetParameters(vparam);
     video_renderer_->InvalidateCache(TimeRange(0, GetConnectedNode()->Length()));
+  }
+
+  AudioRenderingParams aparam(GetConnectedNode()->audio_params(),
+                              SampleFormat::GetConfiguredFormatForMode(render_mode));
+
+  if (audio_renderer_->params() != aparam) {
+    audio_renderer_->SetParameters(aparam);
+    audio_renderer_->InvalidateCache(TimeRange(0, GetConnectedNode()->Length()));
+  }
 }
 
 void ViewerWidget::ShowContextMenu(const QPoint &pos)