71 lines
2.9 KiB
C#
71 lines
2.9 KiB
C#
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using UnityEngine;
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using System.Collections;
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namespace Dreamteck.Splines.Examples
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{
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public class SpectrumVisualizer : MonoBehaviour
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{
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public int samples = 1024;
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[Tooltip("The starting percent of the spectrum. 0 is 20Hz and 1 is 20KHz")]
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[Range(0f, 1f)]
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public float minSpectrumRange = 0f;
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[Tooltip("The ending percent of the spectrum. 0 is 20Hz and 1 is 20KHz")]
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[Range(0f, 1f)]
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public float maxSpectrumRange = 1f;
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public float increaseSpeed = 50f;
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public float decreaseSpeed = 10f;
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public float maxOffset = 10f;
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public AudioSource source;
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private SplineComputer computer;
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private Vector3[] positions;
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public AnimationCurve spectrumMultiply; //lower frequencies have bigger values, this is used to even the values
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private float[] spectrumLerp;
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// Use this for initialization
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void Start()
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{
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if(source == null) source = GetComponent<AudioSource>();
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computer = GetComponent<SplineComputer>();
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SplinePoint[] points = computer.GetPoints();
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positions = new Vector3[points.Length];
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for (int i = 0; i < points.Length; i++)
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{
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positions[i] = points[i].position;
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}
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spectrumLerp = new float[points.Length];
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}
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// Update is called once per frame
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void Update()
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{
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float[] left = new float[samples];
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float[] right = new float[samples];
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source.GetSpectrumData(left, 0, FFTWindow.Hanning);
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source.GetSpectrumData(right, 1, FFTWindow.Hanning);
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float[] spectrum = new float[left.Length];
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for (int i = 0; i < spectrum.Length; i++)
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{
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spectrum[i] = (left[i] + right[i])/2f;
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}
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SplinePoint[] points = computer.GetPoints();
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int samplesPerPoint = Mathf.FloorToInt((spectrum.Length / points.Length) * (maxSpectrumRange-minSpectrumRange));
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int spectrumIndexStart = Mathf.FloorToInt((spectrum.Length - 1) * minSpectrumRange);
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for (int i = 0; i < points.Length; i++)
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{
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float avg = 0f;
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for (int n = 0; n < samplesPerPoint ; n++) avg += spectrum[spectrumIndexStart + samplesPerPoint * i + n];
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avg /= samplesPerPoint;
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if (avg > spectrumLerp[i]) spectrumLerp[i] = Mathf.Lerp(spectrumLerp[i], avg, Time.deltaTime * increaseSpeed);
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else spectrumLerp[i] = Mathf.Lerp(spectrumLerp[i], avg, Time.deltaTime * decreaseSpeed);
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float percent = (float)i / (points.Length - 1);
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points[i].position = positions[i] + Vector3.up * maxOffset * spectrumLerp[i] * spectrumMultiply.Evaluate(percent);
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}
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computer.SetPoints(points);
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}
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}
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}
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