Logger: add logInFile

Clement Champetier · Clement Champetier · commit 5f1daf633fdc · 2015-03-03T17:05:33.000+01:00
diff --git a/src/AvTranscoder/common.cpp b/src/AvTranscoder/common.cpp
@@ -54,4 +54,30 @@ void Logger::log( int level, const std::string& msg )
 	av_log( NULL, level, avTranscoderMsg.c_str() );
 }
 
+void callbackToWriteInFile( void *ptr, int level, const char *fmt, va_list vl )
+{
+	// Format a line of log the same way as the default callback
+	char line[1024];
+	static int print_prefix = 1;
+	av_log_format_line(ptr, level, fmt, vl, line, sizeof(line), &print_prefix);
+
+	// Print line in log file
+	std::ofstream outputFile;
+	outputFile.open( Logger::getLogFileName().c_str(), std::ios::out | std::ios::app );
+	outputFile << line;
+	outputFile.close();
+}
+
+void Logger::logInFile()
+{
+	av_log_set_callback( callbackToWriteInFile );
+
+	// clean log file
+	std::ofstream outputFile;
+	outputFile.open( Logger::getLogFileName().c_str() );
+	outputFile.close();
+}
+
+std::string Logger::_logFileName( "avtranscoder.log" );
+
 }
diff --git a/src/AvTranscoder/common.hpp b/src/AvTranscoder/common.hpp
@@ -18,6 +18,7 @@ extern "C" {
 #include <string>
 #include <cstring>
 #include <sstream>
+#include <fstream>
 
 #ifdef SWIG
  #define AvExport
@@ -85,6 +86,23 @@ class AvExport Logger
 	 * @param msg: the message will be suffixed by '\n'
 	 */
 	static void log( int level, const std::string& msg );
+
+	/**
+	 * @brief Log ffmpeg/libav and avtranscoder informations in a text file.
+	 * @note Default log filename is avtranscoder.log
+	 * @see getLogFileName
+	 * @see setLogFileName
+	 */
+	static void logInFile();
+
+	///@{
+	/// @warning Need to set the expected log filename before calling logInFile
+	static std::string& getLogFileName() { return _logFileName; }
+	static void setLogFileName( const std::string& newLogFileName ) { _logFileName = newLogFileName; }
+	///@}
+
+private:
+	static std::string _logFileName;  ///< Name of the log file
 };
 
 }
