Improve intermediate files exportation

- Thread-safe directory creation
- By default a time stamp is appended to dir path
- Previous behaviour (with file removing) is
  enable by intermediateFilesDirTimeStamp = false

Author: Louis Fréneau

src/lib/utils/fileExport.cpp

@@ -86,9 +86,16 @@ void createDirs(const std::string& filePath) {
         return;
     }
 
-    // Create all missing directories
-    if(!std::filesystem::create_directories(dir)) {
-       throw std::runtime_error("Error : failed to create directories : " + dir.string() + " for the intermediate file : " + filePath); 
+    // Thread-safe missing directory creation
+    static std::mutex fs_mutex;
+    {
+    std::lock_guard<std::mutex> lock(fs_mutex);
+    std::error_code ec;
+    if (!std::filesystem::create_directories(dir,ec)) {
+        if(ec) {
+            throw std::runtime_error("Error: failed to create directories: " + dir.string() + " for the intermediate file: " + filePath + ". " + ec.message());
+        }
+    }
     }
 }
 
@@ -199,7 +206,7 @@ namespace FileExport {
 
     void cleanIntermediateFiles() {
         // Remove all files within the intermediate files directory if it exists but keep the subdirectory structure intact.
-        Logger::log<LogLevel::TRACE>("EXPORT FILE","Clean intermediate files directory.\n");
+        Logger::log<LogLevel::INFO>("EXPORT FILE","Clean intermediate files directory.\n");
 
         const std::filesystem::path root(p_->intermediateFilesDir);
 

src/lib/utils/parameters.cpp

@@ -162,6 +162,7 @@ void initializeParameterMap(Parameters& param) {
 
         // ___ Debug parameters ___ //
         {"exportIntermediateFiles", {BOOL, "", &param.exportIntermediateFiles}},
+        {"intermediateFilesDirTimeStamp", {BOOL, "", &param.intermediateFilesDirTimeStamp}},
         {"timerLog", {BOOL, "", &param.timerLog}},
 
         // ___ Activate or not some features ___ //

src/lib/utils/parameters.hpp

@@ -56,10 +56,11 @@ struct Parameters {
     bool doubleLayer = true;
     std::string logLevel = "INFO";
     bool errorsAreFatal = true;
-    std::string intermediateFilesDir;
-
+    
     // ___ Debug parameters ___ //
     bool exportIntermediateFiles = false;
+    bool intermediateFilesDirTimeStamp = true;
+    std::string intermediateFilesDir;
     bool timerLog = false; // TODO(lf): remove and activate it if loglevel is profiling
 
     // ___ Activate or not some features ___ //

src/lib/uvgvpcc.cpp

@@ -389,7 +389,31 @@ void parseUvgvpccParameters() {
     if(p_->attributeEncodingNbThread == 0) {
         uvgvpcc_enc::Logger::log<uvgvpcc_enc::LogLevel::DEBUG>("API","'attributeEncodingNbThread' is set to 0. The number of thread used for the attribute video 2D encoding is then the detected number of threads: "+detectedThreadNumber + "\n");
         setParameterValue("attributeEncodingNbThread",detectedThreadNumber,false);
-    }       
+    }
+
+    if(p_->exportIntermediateFiles && p_->intermediateFilesDirTimeStamp) {
+        uvgvpcc_enc::Logger::log<uvgvpcc_enc::LogLevel::DEBUG>("API","'intermediateFilesDirTimeStamp' is true, so a time stamp is added to the 'intermediateFilesDir' path.\n");
+        
+        std::time_t now = std::time(nullptr);
+        std::tm* localTime = std::localtime(&now);
+
+        std::ostringstream oss;
+        oss << std::setfill('0') << std::setw(2) << (localTime->tm_year % 100)
+            << std::setw(2) << (localTime->tm_mon + 1)
+            << std::setw(2) << localTime->tm_mday
+            << std::setw(2) << localTime->tm_hour
+            << std::setw(2) << localTime->tm_min
+            << std::setw(2) << localTime->tm_sec;
+
+        std::string dir = p_->intermediateFilesDir;
+        if (!dir.empty() && dir.back() == '/') {
+            dir.pop_back(); // Remove trailing slash
+        }
+
+        setParameterValue("intermediateFilesDir",dir + oss.str(),false);        
+    }
+
+
 }
 
 static void initializeContext() {
@@ -427,7 +451,7 @@ void API::initializeEncoder() {
     initializeStaticParameters();
     initializeStaticFunctionPointers();
     initializeContext();
-    if(p_->exportIntermediateFiles) FileExport::cleanIntermediateFiles();
+    if(p_->exportIntermediateFiles && !p_->intermediateFilesDirTimeStamp) FileExport::cleanIntermediateFiles();
     initializationDone = true;
 }