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AudioSource.GetSpectrumData

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public void GetSpectrumData(float[] samples, int channel, FFTWindow window);

Parameters

samplesThe array to populate with audio samples. Its length must be a power of 2.
channelThe channel to sample from.
windowThe FFTWindow type to use when sampling.

Description

Provides a block of the currently playing audio source'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 provided) 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.

See Also: AudioSource.GetOutputData, AudioListener.GetSpectrumData, AudioListener.GetOutputData.

using UnityEngine;

[RequireComponent(typeof(AudioSource))] public class AudioSourceGetSpectrumDataExample : 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); } } }

Obsolete public float[] GetSpectrumData(int numSamples, int channel, FFTWindow window);

Parameters

numSamplesThe number of samples to retrieve. Must be a power of 2.
channelThe channel to sample from.
windowThe FFTWindow type to use when sampling.

Description

Deprecated Version. Returns a block of the currently playing source'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.

Number of values (numSamples) 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.

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