libsaria: Created a seek_to() function

This function will seek to an absolute percentage of a song, rather than
by some displaced amount.

include/libsaria/audio.h

@@ -31,7 +31,11 @@ class Audio
 		/* Control functions */
 		bool play();
 		bool pause();
+
+		/* Functions related to position in the song */
 		void seek();
+		bool seek_to(double);
+		bool get_duration(gint64 &);
 };
 
 #endif /* LIBSARIA_AUDIO_H */

include/libsaria/libsaria.h

@@ -25,7 +25,10 @@ class Libsaria
 		void play();
 		void pause();
 		void stop();
-		void seek();
+
+		/* Functions related to position in the song */
+		void seek(int);
+		void seek_to(double);
 };
 
 class Libsaria *libsaria_get();

include/libsaria/progress.h

@@ -1,3 +1,3 @@
 
-void libsaria_seek();
+void libsaria_seek(int);
 

libsaria/audio/progress.cpp

@@ -1,6 +1,26 @@
 
 #include <libsaria/audio.h>
 
+bool Audio::get_duration(gint64 &duration)
+{
+	GstFormat format;
+	return gst_element_query_duration(GST_ELEMENT(player),
+				   &format,
+				   &duration);
+}
+
+bool Audio::seek_to(double prcnt)
+{
+	bool ret;
+	gint64 duration;
+	ret = get_duration(duration);
+	gst_element_seek_simple(GST_ELEMENT(player),
+				GST_FORMAT_TIME,
+				GST_SEEK_FLAG_FLUSH,
+				duration * prcnt);
+	return ret;
+}
+
 /*
  * Right now I just seek to the beginning of the song.
  * Eventually I should allow the user to seek anywhere.

libsaria/controls.cpp

@@ -21,7 +21,7 @@ void Libsaria::pause()
 void Libsaria::stop()
 {
 	pause();
-	seek();
+	seek_to(0);
 }
 
 /*

libsaria/progress.cpp

@@ -5,7 +5,12 @@
  * Implementations of functions defined in the libsaria class
  */
 
-void Libsaria::seek()
+void Libsaria::seek_to(double prcnt)
+{
+	audio.seek_to(prcnt);
+}
+
+void Libsaria::seek(int dt)
 {
 	audio.seek();
 }
@@ -14,8 +19,8 @@ void Libsaria::seek()
  * Convenience functions for accessing libsaria class functions
  */
 
-void libsaria_seek()
+void libsaria_seek(int dt)
 {
-	libsaria_get()->seek();
+	libsaria_get()->seek(dt);
 }