libsaria: Return the current audio position as a string

This returns it in mm:ss format for easy use by the UI

include/libsaria/audio.h

@@ -26,6 +26,7 @@ namespace libsaria
 		bool seek_to(double);
 		gint64 duration();
 		gint64 position();
+		string posstr();
 
 		/* Volume functions */
 		double get_volume();

libsaria/audio/progress.cpp

@@ -1,4 +1,7 @@
 
+#include <sstream>
+using namespace std;
+
 #include <libsaria/audio.h>
 #include "audio.h"
 
@@ -73,4 +76,19 @@ namespace libsaria
 		return position;
 	}
 
+	string audio::posstr()
+	{
+		stringstream stream;
+		int minutes, seconds, pos;
+
+		pos = position() / GST_SECOND;
+		minutes = pos / 60;
+		seconds = pos - (minutes * 60);
+		stream << minutes << ":";
+		if (seconds < 10)
+			stream << "0";
+		stream << seconds;
+		return stream.str();
+	}
+
 };