Added methods for controlling playback speed to playback controller

src/de/danoeh/antennapod/service/PlaybackService.java

@@ -1554,6 +1554,16 @@ public class PlaybackService extends Service {
 		}
 	}
 	
+	public double getCurrentPlaybackSpeed() {
+		if (media.getMediaType() == MediaType.AUDIO && player instanceof AudioPlayer) {
+			AudioPlayer audioPlayer = (AudioPlayer) player;
+			if (audioPlayer.canSetSpeed()) {
+				return audioPlayer.getCurrentSpeedMultiplier();
+			}
+		}
+		return -1;
+	}
+
 	/**
 	 * call getDuration() on mediaplayer or return INVALID_TIME if player is in
 	 * an invalid state. This method should be used instead of calling

src/de/danoeh/antennapod/util/playback/PlaybackController.java

@@ -654,6 +654,24 @@ public abstract class PlaybackController {
 		return false;
 	}
 
+	public boolean canSetPlaybackSpeed() {
+		return playbackService != null && playbackService.canSetSpeed();
+	}
+	
+	public void setPlaybackSpeed(double speed) {
+		if (playbackService != null) {
+			playbackService.setSpeed(speed);
+		}
+	}
+	
+	public double getCurrentPlaybackSpeedMultiplier() {
+		if (canSetPlaybackSpeed()) {
+			return playbackService.getCurrentPlaybackSpeed();
+		} else {
+			return -1;
+		}
+	}
+
 	/**
 	 * Returns true if PlaybackController can communicate with the playback
 	 * service.