Capturing Sound Card Audio with CSCore

Unity Engine
1

So, I’m about ready to call it and give up right here. I’m trying to make a sound visualizer, but in order to do that I need to capture the feed coming from the sound card, so whatever audio is being pushed to the speakers I can capture and visualize. Unfortunately, I don’t know how to do that even remotely. I found a couple things (namely CSCore and NAudio) and I am currently running experiments with CSCore. My current capture script looks like this:

using UnityEngine;
using System;
using CSCore;
using CSCore.SoundIn;
using CSCore.Codecs.WAV;

public class SoundCapture : MonoBehaviour {
    public WasapiCapture capture = new WasapiLoopbackCapture();
    public WaveWriter w;
   
    void Start() {
        w = new WaveWriter("dump.wav", capture.WaveFormat);
    }

    void Update() {
        capture.Initialize();
        capture.DataAvailable += (s, e) => {
                w.Write(e.Data, e.Offset, e.ByteCount);
            };
        capture.Start();
        Console.ReadKey();
        capture.Stop();
    }
}

but that returns a bunch of errors (like a NullReferenceException and NotImplementedException) so I don’t know what to do anymore. If you guys have any suggestions on changes I can make to the code, or other libraries I can use to better understand capturing sound from the sound card, let me know. Thank you.

2

Any luck with this? Struggling with the same thing.

3

This might help if anyone stumbles across this post:

https://www.reddit.com/r/Unity3D/comments/4xoshl/i_made_a_simple_visualization_example_using_the/

3 Likes