Snap Audio Emitter To Spline (Unity)

using UnityEngine;
using UnityEngine.Splines;

public class SnapAudioEmitterToSpline : MonoBehaviour
{
    public SplineContainer splineContainer;
    public AudioSource audioSource;

    private AudioListener audioListener;
    private float m_audioDistanceNormalized;

    private void Reset()
    {
        audioSource = GetComponentInParent<AudioSource>();
    }

    private void Update()
    {
        if (audioSource)
        {
            UpdateAudio();
        }
    }

    private void UpdateAudio()
    {
        if (!audioListener) audioListener = FindObjectOfType<AudioListener>();
        if (!audioListener) return;

        if (!splineContainer) return;

        Vector3 earPosition = audioListener.transform.position;

        //Ear position in the spline's local-space
        earPosition = splineContainer.transform.InverseTransformPoint(earPosition);

        SplineUtility.GetNearestPoint(splineContainer.Spline, earPosition, out var nearestPoint, out _, SplineUtility.PickResolutionMin, 1);

        audioSource.dopplerLevel = 0;
        audioSource.transform.position = splineContainer.transform.TransformPoint(nearestPoint);
    }

    private void OnDrawGizmosSelected()
    {
        if (audioSource)
        {
            Gizmos.DrawSphere(audioSource.transform.position, 1f);
            Gizmos.DrawWireSphere(audioSource.transform.position, audioSource.maxDistance);
        }
    }
}