AudioListener.GetSpectrumData

Parameters

Description

Provides a block of the listener (master)'s spectrum data.

The array given in the samples parameter will be filled with the requested data.

Number of values (the length of the samples array) must be a power of 2. (ie 128/256/512 etc). Min = 64. Max = 8192. Use window to reduce leakage between frequency bins/bands. Note, the more complex window type, the better the quality, but reduced speed.

This function will use the sampling rate specified in AudioSettings.outputSampleRate, and NOT the sampling rate specified for the audio clip.

Additional resources: AudioListener.GetOutputData, AudioSource.GetSpectrumData, AudioSource.GetOutputData.

using UnityEngine;


[RequireComponent(typeof(AudioListener))]
public class GetSpectrumDataExample : MonoBehaviour
{
    void Update()
    {
        float[] spectrum = new float[256];

        AudioListener.GetSpectrumData(spectrum, 0, FFTWindow.Rectangular);

        for (int i = 1; i < spectrum.Length - 1; i++)
        {
            Debug.DrawLine(new Vector3(i - 1, spectrum[i] + 10, 0), new Vector3(i, spectrum[i + 1] + 10, 0), Color.red);
            Debug.DrawLine(new Vector3(i - 1, Mathf.Log(spectrum[i - 1]) + 10, 2), new Vector3(i, Mathf.Log(spectrum[i]) + 10, 2), Color.cyan);
            Debug.DrawLine(new Vector3(Mathf.Log(i - 1), spectrum[i - 1] - 10, 1), new Vector3(Mathf.Log(i), spectrum[i] - 10, 1), Color.green);
            Debug.DrawLine(new Vector3(Mathf.Log(i - 1), Mathf.Log(spectrum[i - 1]), 3), new Vector3(Mathf.Log(i), Mathf.Log(spectrum[i]), 3), Color.blue);
        }
    }
}

Parameters

Description

Deprecated Version. Returns a block of the listener (master)'s spectrum data.

This variation of the function allocates a new array each time it is called. Use the Non-alloc version instead for better performance.