examples: playbin: show how to use debug_to_dot_file()

examples/src/bin/playbin.rs

@@ -121,6 +121,21 @@ fn example_main() {
                 );
                 break;
             }
+            MessageView::StateChanged(state_changed) =>
+            // We are only interested in state-changed messages from playbin
+            {
+                if state_changed
+                    .get_src()
+                    .map(|s| s == playbin)
+                    .unwrap_or(false)
+                    && state_changed.get_current() == gst::State::Playing
+                {
+                    // Generate a dot graph of the pipeline to GST_DEBUG_DUMP_DOT_DIR if defined
+                    let bin_ref = playbin.downcast_ref::<gst::Bin>().unwrap();
+                    bin_ref.debug_to_dot_file(gst::DebugGraphDetails::all(), "PLAYING");
+                }
+            }
+
             _ => (),
         }
     }