From a747ab7af704de313a836b7ce2336aa3220b83b6 Mon Sep 17 00:00:00 2001
From: Alfred Neumayer <dev.beidl@gmail.com>
Date: Mon, 1 Apr 2019 19:00:40 +0200
Subject: [PATCH] avoid processing empty video frame buffers

---
 src/QZXingFilter.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/QZXingFilter.cpp b/src/QZXingFilter.cpp
index f60883d..8ec2998 100644
--- a/src/QZXingFilter.cpp
+++ b/src/QZXingFilter.cpp
@@ -191,6 +191,12 @@ static QImage* rgbDataToGrayscale(const uchar* data, const CaptureRect& captureR
 
 void QZXingFilterRunnable::processVideoFrameProbed(SimpleVideoFrame & videoFrame, const QRect& _captureRect)
 {
+    if (videoFrame.data.length() < 1) {
+        qDebug() << "QZXingFilterRunnable: Buffer is empty";
+        filter->decoding = false;
+        return;
+    }
+
     static unsigned int i = 0; i++;
 //    qDebug() << "Future: Going to process frame: " << i;