Crusher

BitCrusher.cs

public class BitCrusher : MonoBehaviour
{
	[Range (1f,16f)]
	public float bits = 16f;

	[Range (20f,48000f)]
	public float sampleRate = 48000f;

	private float phase = 0;
	private float last = 0;
	private float baseSampleRate; 

	public BitCrusher()
	{
		baseSampleRate = (float)AudioSettings.outputSampleRate;
	}

	public void OnAudioFilterRead(float[] data, int channels)
	{
		float freqDelta = sampleRate/baseSampleRate;
		float quantizeReso = Mathf.Pow(2f,bits);

		int length = data.Length;
		for(int d = 0; d<length; d++)
		{
			phase = phase + freqDelta;
			if(phase >= 1f)
			{
				phase = phase - 1f;
				last = Mathf.Floor((data[d]*quantizeReso) + 0.5f) / quantizeReso;
			}

			data[d] = last;
			data[++d] = last;
		}
	}
}