libsaria: Added a get_volume() function

I use this function to get the current volume levels.  I added and extra
variable to the Audio class to track what the current volume is.

include/libsaria/audio.h

@@ -13,6 +13,7 @@ class Audio
 	private:
 		GstElement *player;
 		string cur_file;
+		double cur_volume;
 
 		void reset();
 		bool change_state(GstState);
@@ -25,6 +26,7 @@ class Audio
 		void init(int, char **);
 		void load(string);
 		void set_volume(double);
+		double get_volume();
 
 		/* Control functions */
 		bool play();

include/libsaria/libsaria.h

@@ -18,6 +18,7 @@ class Libsaria
 		/* Other functions */
 		void load(string);
 		void set_volume(double);
+		double get_volume();
 		void register_callback(callback_t, void (*)());
 
 		/* Control functions */

libsaria/audio/audio.cpp

@@ -25,6 +25,7 @@ void Audio::init(int argc, char **argv)
 	print("Initializing gstreamer");
 	init_gstreamer(argc, argv);
 	player = gst_element_factory_make("playbin2", "player");
+	set_volume(1.0);
 }
 
 void Audio::reset()

libsaria/audio/volume.cpp

@@ -6,5 +6,12 @@ void Audio::set_volume(double volume)
 	GValue value = { 0, };
 	g_value_init(&value, G_TYPE_DOUBLE);
 	g_value_set_double(&value, volume);
+
 	g_object_set_property(G_OBJECT(player), "volume", &value);
+	cur_volume = volume;
+}
+
+double Audio::get_volume()
+{
+	return cur_volume;
 }

libsaria/libsaria.cpp

@@ -21,3 +21,8 @@ void Libsaria::set_volume(double volume)
 	audio.set_volume(volume);
 	trigger_callback(VOLUME);
 }
+
+double Libsaria::get_volume()
+{
+	return audio.get_volume();
+}