From 3d78a3cb97ed470f331c5cdf7a3f3b2714a92f78 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Mon, 20 Jul 2015 13:18:06 +0200
Subject: plug in race in camera release

We can crash if start/stop pressed fast eventually.
---
 ftnoir_tracker_aruco/ftnoir_tracker_aruco.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'ftnoir_tracker_aruco/ftnoir_tracker_aruco.cpp')

diff --git a/ftnoir_tracker_aruco/ftnoir_tracker_aruco.cpp b/ftnoir_tracker_aruco/ftnoir_tracker_aruco.cpp
index 786be62d..8acddc28 100644
--- a/ftnoir_tracker_aruco/ftnoir_tracker_aruco.cpp
+++ b/ftnoir_tracker_aruco/ftnoir_tracker_aruco.cpp
@@ -18,6 +18,7 @@
 #include <opencv2/videoio.hpp>
 #include "opentrack/camera-names.hpp"
 #include "opentrack/opencv-calibration.hpp"
+#include "opentrack/sleep.hpp"
 
 typedef struct {
     int width;
@@ -355,6 +356,9 @@ fail:
         if (frame.rows > 0)
             videoWidget->update_image(frame);
     }
+
+    // give opencv time to exit camera threads, etc.
+    portable::sleep(500);
 }
 
 void Tracker::data(double *data)
-- 
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