From 747053f1327083eaa20529b5e5d97458ddbf775e Mon Sep 17 00:00:00 2001
From: TimZnr <zeunerti74726@th-nuernberg.de>
Date: Wed, 4 Jan 2023 21:50:02 +0100
Subject: [PATCH] input threadsafe

---
 AutonomousMode/Input/input.cpp | 8 ++++++--
 AutonomousMode/Input/input.h   | 2 +-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/AutonomousMode/Input/input.cpp b/AutonomousMode/Input/input.cpp
index 7dd90cf..3005c0c 100644
--- a/AutonomousMode/Input/input.cpp
+++ b/AutonomousMode/Input/input.cpp
@@ -1,9 +1,10 @@
 #include "input.h"
 
 // TODO: Wenn ihr in die Zeile den Pfad zum Testvideo statt der 0 packt, benmutzt er das Testvideo.
-Input::Input(int videoHeight, int videoWidth) : cap("C:\\Line-Following-Robot\\AutonomousMode\\Test_data\\video1.h264"), videoHeight(videoHeight), videoWidth(videoWidth)
+Input::Input(int videoHeight, int videoWidth) : cap("C:\\Line-Following-Robot\\AutonomousMode\\Test_data\\video1.h264"), videoHeight(videoHeight), videoWidth(videoWidth)//Input::Input(int videoHeight, int videoWidth) : cap(0), videoHeight(videoHeight), videoWidth(videoWidth)
 //Input::Input(int videoHeight, int videoWidth) : cap(0), videoHeight(videoHeight), videoWidth(videoWidth)
 {
+    std::unique_lock<std::mutex> lock(mtx);
     this->cap.set(CAP_PROP_FRAME_HEIGHT, videoHeight);
     this->cap.set(CAP_PROP_FRAME_WIDTH, videoWidth);
 }
@@ -15,7 +16,8 @@ Input::~Input()
 
 Mat Input::readFile(String filePath)
 {
-    std::srand(std::time(0));
+    std::unique_lock<std::mutex> lock(mtx);
+    std::srand(static_cast<unsigned int>(std::time(0)));
     // Read all .jpg files from the specified folder
     cv::String folder = filePath;
     std::vector<cv::String> filenames;
@@ -40,6 +42,7 @@ Mat Input::readFile(String filePath)
 
 Mat Input::readWebcam()
 {
+    std::unique_lock<std::mutex> lock(mtx);
     Mat image;
 
     if(!cap.isOpened()) {
@@ -59,5 +62,6 @@ Mat Input::readWebcam()
 
 void Input::freeWebcam()
 {
+    std::unique_lock<std::mutex> lock(mtx);
     this->cap.release();
 }
diff --git a/AutonomousMode/Input/input.h b/AutonomousMode/Input/input.h
index c87191a..32b467a 100644
--- a/AutonomousMode/Input/input.h
+++ b/AutonomousMode/Input/input.h
@@ -16,7 +16,7 @@ class Input
 {
 private:
     VideoCapture cap;
-
+    mutable std::mutex mtx;
 public:
     int videoHeight;
     int videoWidth;