From b8d99e1ffb1f16c295bdbf6b756c91cb59c304c0 Mon Sep 17 00:00:00 2001
From: umbraclet16 <448101470@qq.com>
Date: Sat, 25 Feb 2017 16:16:23 +0800
Subject: [PATCH] Solve issue #8264

Fix bug in camera_calibration.cpp that the program tries to
parse input of type VIDEO_FILE as IMAGE_LIST which causes the
program to crash.
---
 .../camera_calibration/camera_calibration.cpp        | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/samples/cpp/tutorial_code/calib3d/camera_calibration/camera_calibration.cpp b/samples/cpp/tutorial_code/calib3d/camera_calibration/camera_calibration.cpp
index 6df0c1677b..86d8892c19 100644
--- a/samples/cpp/tutorial_code/calib3d/camera_calibration/camera_calibration.cpp
+++ b/samples/cpp/tutorial_code/calib3d/camera_calibration/camera_calibration.cpp
@@ -101,7 +101,7 @@ public:
             }
             else
             {
-                if (readStringList(input, imageList))
+                if (isListOfImages(input) && readStringList(input, imageList))
                     {
                         inputType = IMAGE_LIST;
                         nrFrames = (nrFrames < (int)imageList.size()) ? nrFrames : (int)imageList.size();
@@ -169,6 +169,16 @@ public:
             l.push_back((string)*it);
         return true;
     }
+
+    static bool isListOfImages( const string& filename)
+    {
+        string s(filename);
+        // Look for file extension
+        if( s.find(".xml") == string::npos && s.find(".yaml") == string::npos && s.find(".yml") == string::npos )
+            return false;
+        else
+            return true;
+    }
 public:
     Size boardSize;            // The size of the board -> Number of items by width and height
     Pattern calibrationPattern;// One of the Chessboard, circles, or asymmetric circle pattern