I want to build a reverb filter, using OnAudioFilterRead().
Here (Google Drive) is a link to a project file with a scene that uses my current code.
In my code I have a method which looks at the environment, and creates a list of delay values based on the positions of objects relative to the player. However, my current structure results in audio glitches, which I think might be caused by the fact that the methods Reflections() and OnAudioFilterRead() are not being called in sync.
I am currently using an InvokeRepeating() to call Reflections(), however I’d much rather be able to call the latter at a specific moment relative to OnAudioFilterRead(). But, because OnAudioFilterRead() apparantly runs on a seperate thread, I can’t call Reflections() from within OnAudioFilterRead().
If you know how to resolve my audio glitches, and perhaps can tell me something about their origin, I’d be very greatfull! :]
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class myReverb : MonoBehaviour
{
float[] myBuffer;
Collider[] myObjects;
List<int> myReflections = new List<int>();
Vector3 myPosition;
float myDistance;
int myDelay;
public float myRange;
public float myVolume;
void Start()
{
myBuffer = new float[40960];
for (int h = 0; h < 40960; h++)
{
myBuffer <mark>= 0f;</mark>
}
//InvokeRepeating results in audio glitches, because it will not run synchronously with OnAudioFilterRead()…
InvokeRepeating (“Reflections”, 0f, 0.01f);
}
public void Reflections()
{
//Clear List…
myReflections.Clear();
//Map environment based on current location…
myPosition = transform.position;
myObjects = Physics.OverlapSphere(myPosition, myRange);
foreach (Collider _Object in myObjects)
{
if (_Object.gameObject.GetComponent())
{
//Convert distance to time, expressed in a number of samples…
myReflections.Add((int)((Vector3.Distance(myPosition, _Object.gameObject.transform.position) / 340.29f) * 44100));
}
}
}
void OnAudioFilterRead(float data, int channels)
{
//Buffer actions…
for (int a = 0; a < 38912; a++)
{
myBuffer[a] = myBuffer[a + 2048];
}
for (int b = 0; b < 2048; b++)
{
myBuffer[38912 + b] = data**;
}
//I’m not allowed to call a method from within OnAudioFilterRead()… 
//Reflections();
//Insert reflections into audio…
for (int c = 0; c < myReflections.Count; c++)
{
myDelay = myReflections**
```c
**;
for (int d = 0; d < 2048; d++)
{
data[d] += myBuffer[38912 + d - myDelay] * myVolume;
}
}
}
}
```