Connected volume control GUI with Controller class, and made slider non-linear.

This should be reviewed, and a better algorith should be selected.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17375 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/mediaplayer/Controller.h

@@ -27,6 +27,7 @@
 class BBitmap;
 class BMediaFile;
 class BMediaTrack;
+class SoundOutput;
 class VideoView;
 
 class Controller
@@ -63,6 +64,8 @@ public:
 	
 	void					VolumeUp();
 	void					VolumeDown();
+	
+	void					SetVolume(float value);
 
 private:
 	static int32			audio_play_thread(void *self);
@@ -95,6 +98,7 @@ private:
 	thread_id				fVideoPlayThread;
 	volatile bool			fStopAudioPlayback;
 	volatile bool			fStopVideoPlayback;
+	SoundOutput	*			fSoundOutput;
 };