get the local speed of character controller?

Hey, so i have the player moving and i have some animations, i just need to get the local or relative speeds of the player character controller (using the default fps controller) so when i press "a" the speed is local to the players moving left in any direction he is facing

heres my code

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class animation : MonoBehaviour {
5.  
6.     Animator anim;
7.     void Start ()
8.     {
9.         anim = GetComponent<Animator>();
10.     }
11.    
12.    
13.     void Update ()
14.     {
15.  
16.         CharacterController controller = GetComponentInParent<CharacterController>();
17.         Vector3 horizontalVelocity = controller.velocity;
18.         horizontalVelocity = new Vector3(controller.velocity.x, 0, controller.velocity.z);
19.         float horizontalSpeed = horizontalVelocity.magnitude;
20.         float verticalSpeed = controller.velocity.y;
21.         float overallSpeed = controller.velocity.magnitude;
22.  
23.         Vector3 horizontalVelocityX = controller.velocity;
24.         horizontalVelocityX = new Vector3(controller.velocity.x, 0, 0);
25.         float horizontalSpeedX = horizontalVelocityX.magnitude;
26.  
27.         Vector3 horizontalVelocityZ = controller.velocity;
28.         horizontalVelocityZ = new Vector3(0, 0, controller.velocity.z);
29.         float horizontalSpeedZ = horizontalVelocityZ.magnitude;
30.  
31.         anim.SetFloat("VelocityX", horizontalSpeedX);
32.         anim.SetFloat("VelocityZ", horizontalSpeedZ);
33.         anim.SetFloat("Speed", horizontalSpeed);
34. }}