Vuforia Audio Source

ImageTargetAudioSource.cs

using UnityEngine;
using Vuforia;

[RequireComponent(typeof(AudioSource))]
public class ImageTargetAudioSource : MonoBehaviour, ITrackableEventHandler
{
	[Tooltip("The AudioSource to be activated when the object becomes tracked.")]
	public AudioSource audioSource;
    private TrackableBehaviour mTrackableBehaviour;
 
	void Reset() 
	{
		//On Reset of the component (or when its first added), get the audioSource and prepare it.
		audioSource = GetComponent<AudioSource>();
		if (audioSource)  audioSource.playOnAwake = false;
	}
 
    void Start()
    {
		//Get the audio source and the trackable behaviour. If we manage to get a tracking behaviour, subscribe to its event handler.
		if (audioSource == null) audioSource = GetComponent<AudioSource>();
        mTrackableBehaviour = GetComponent<TrackableBehaviour>();
        if (mTrackableBehaviour)
        {
            mTrackableBehaviour.RegisterTrackableEventHandler(this);
        }
    }
     
    public void OnTrackableStateChanged(TrackableBehaviour.Status previousStatus, TrackableBehaviour.Status newStatus)
    {
		//This is called every time the tracking state changes. If we find the audio source and the track, we should play.
		if (audioSource == null) return;
        if (newStatus == TrackableBehaviour.Status.DETECTED ||
            newStatus == TrackableBehaviour.Status.TRACKED ||
            newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)
        {
            // Play audio when target is found
            audioSource.Play();
        }
        else
        {
            // Stop audio when target is lost
            audioSource.Stop();
        }
    }   
}