libsaria: Give the audio separate position() and duration() functions

The UI can use these functions to set up an accurate progress bar based
on the number of nanoseconds each returns.

include/libsaria/audio.h

@@ -1,6 +1,10 @@
 #ifndef LIBSARIA_AUDIO_H
 #define LIBSARIA_AUDIO_H
 
+extern "C" {
+	#include <gst/gst.h>
+}
+
 #include <string>
 using namespace std;
 
@@ -20,7 +24,8 @@ namespace libsaria
 		/* Position related functions */
 		bool seek(int);
 		bool seek_to(double);
-		int get_progress();
+		gint64 duration();
+		gint64 position();
 
 		/* Volume functions */
 		double get_volume();

libsaria/audio/progress.cpp

@@ -57,15 +57,20 @@ namespace libsaria
 		return ret;
 	}
 
-	int audio::get_progress()
+	gint64 audio::duration()
 	{
-		gint64 progress;
 		gint64 duration;
-		if (!get_position(progress))
-			return 0;
 		if (!get_duration(duration))
 			return 0;
-		return (progress * 100) / duration;
+		return duration;
+	}
+
+	gint64 audio::position()
+	{
+		gint64 position;
+		if (!get_position(position))
+			return 0;
+		return position;
 	}
 
 };