/// <summary>
/// Returns a logarithmically scaled and proportionate array of spectrum data from the AudioListener.
/// </summary>
/// <param name="spectrumSize">The size of the returned array.</param>
/// <param name="sampleSize">The size of sample to take from the AudioListener. Must be a power of two. Will only be used in WebGL if no samples have been taken yet.</param>
/// <param name="windowUsed">The FFTWindow to use when sampling. Unused in WebGL.</param>
/// <param name="channelUsed">The audio channel to use when sampling. Unused in WebGL.</param>
/// <returns>A logarithmically scaled and proportionate array of spectrum data from the AudioListener.</returns>
public static float[] GetLogarithmicSpectrumData(int spectrumSize, int sampleSize, FFTWindow windowUsed = FFTWindow.BlackmanHarris, int channelUsed = 0)
{
#if WEB_MODE
sampleSize = SSWebInteract.SetFFTSize(sampleSize); //set the WebGL sampleSize if not already done, otherwise get the current sample size.
#endif
float[] spectrum = new float[spectrumSize];
channelUsed = Mathf.Clamp(channelUsed, 0, 1);
float[] samples = new float[Mathf.ClosestPowerOfTwo(sampleSize)];
#if WEB_MODE
SSWebInteract.GetSpectrumData(samples); //get the spectrum data from the JS lib
#else
AudioListener.GetSpectrumData(samples, channelUsed, windowUsed);
#endif
float highestLogSampleFreq = Mathf.Log(spectrum.Length + 1, 2); //gets the highest possible logged frequency, used to calculate which sample of the spectrum to use for a bar
float logSampleFreqMultiplier = sampleSize / highestLogSampleFreq;
for (int i = 0; i < spectrum.Length; i++) //for each float in the output
{
float trueSampleIndex = (highestLogSampleFreq - Mathf.Log(spectrum.Length + 1 - i, 2)) * logSampleFreqMultiplier; //gets the index equiv of the logified frequency
//the true sample is usually a decimal, so we need to lerp between the floor and ceiling of it.
int sampleIndexFloor = Mathf.FloorToInt(trueSampleIndex);
sampleIndexFloor = Mathf.Clamp(sampleIndexFloor, 0, samples.Length - 2); //just keeping it within the spectrum array's range
float value = Mathf.SmoothStep(spectrum[sampleIndexFloor], spectrum[sampleIndexFloor + 1], trueSampleIndex - sampleIndexFloor); //smoothly interpolate between the two samples using the true index's decimal.
#if WEB_MODE
value = value * (Mathf.Log(trueSampleIndex + 1) + 1); //different due to how the WebAudioAPI outputs spectrum data.
#else
value = value * (trueSampleIndex + 1); //multiply value by its position to make it proportionate
value = Mathf.Sqrt(value); //compress the amplitude values by sqrt(x)
#endif
spectrum[i] = value;
}
return(spectrum);
}
void Start()
{
if (outputType == OutputType.PrefabBar)
{
bar = Instantiate(prefab) as GameObject;
barT = bar.transform;
barT.SetParent(transform, false);
barT.localPosition = Vector3.zero;
Renderer rend = barT.GetChild(0).GetComponent <Renderer>();
if (rend != null)
{
mat = rend.material;
}
else
{
Image img = barT.GetChild(0).GetComponent <Image>();
if (img != null)
{
img.material = new Material(img.material);
mat = img.material;
}
else
{
Debug.LogWarning("Warning from OutputVolume: The Bar Prefab you're using doesn't have a Renderer or Image component as its first child. Dynamic colouring will not work.");
materialColourCanBeUsed = false;
}
}
mat_ValId = Shader.PropertyToID("_Val");
mat.SetColor("_Color1", MinColor);
mat.SetColor("_Color2", MaxColor);
}
#if WEB_MODE
sampleAmount = SSWebInteract.SetFFTSize(sampleAmount);
#endif
}
/// <summary>
/// Rebuilds this instance of Spectrum, applying any changes.
/// </summary>
public void RebuildSpectrum()
{
isEnabled = false; //just in case
//clear all the existing children
int childs = transform.childCount;
for (int i = 0; i < childs; i++)
{
Destroy(transform.GetChild(i).gameObject);
}
RestartMicrophone();
numSamples = Mathf.ClosestPowerOfTwo(numSamples);
#if WEB_MODE
numSamples = SSWebInteract.SetFFTSize(numSamples);
#endif
//initialise arrays
spectrum = new float[numSamples];
bars = new Transform[barAmount];
barMaterials = new Material[barAmount];
oldYScales = new float[barAmount];
oldColorValues = new float[barAmount];
materialColourCanBeUsed = true;
float spectrumLength = barAmount * (1 + barXSpacing);
float midPoint = spectrumLength / 2;
//spectrum bending calculations
float curveAngleRads = 0, curveRadius = 0, halfwayAngleR = 0, halfwayAngleD = 0;
Vector3 curveCentreVector = Vector3.zero;
if (barCurveAngle > 0)
{
curveAngleRads = (barCurveAngle / 360) * (2 * Mathf.PI);
curveRadius = spectrumLength / curveAngleRads;
halfwayAngleR = curveAngleRads / 2;
halfwayAngleD = barCurveAngle / 2;
curveCentreVector = new Vector3(0, 0, 1 * -curveRadius);
if (barCurveAngle == 360)
{
curveCentreVector = new Vector3(0, 0, 0);
}
}
//bar instantiation loop
for (int i = 0; i < barAmount; i++)
{
GameObject barClone = Instantiate(barPrefab, transform, false) as GameObject; //create the bars and assign the parent
//barClone.name = i.ToString();
barClone.transform.localScale = new Vector3(barXScale, barMinYScale, 1);
if (barCurveAngle > 0) //apply spectrum bending
{
float position = ((float)i / barAmount);
float thisBarAngleR = (position * curveAngleRads) - halfwayAngleR;
float thisBarAngleD = (position * barCurveAngle) - halfwayAngleD;
barClone.transform.localPosition = new Vector3(Mathf.Sin(thisBarAngleR) * curveRadius, 0, Mathf.Cos(thisBarAngleR) * curveRadius) + curveCentreVector;
barClone.transform.localRotation = Quaternion.Euler(barXRotation, thisBarAngleD, 0);
}
else //standard positioning
{
barClone.transform.localPosition = new Vector3(i * (1 + barXSpacing) - midPoint, 0, 0);
}
bars[i] = barClone.transform;
Renderer rend = barClone.transform.GetChild(0).GetComponent <Renderer>();
if (rend != null)
{
barMaterials[i] = rend.material;
}
else
{
Image img = barClone.transform.GetChild(0).GetComponent <Image>();
if (img != null)
{
img.material = new Material(img.material);
barMaterials[i] = img.material;
}
else
{
if (materialColourCanBeUsed)
{
Debug.LogWarning("Warning from SimpleSpectrum: The Bar Prefab you're using doesn't have a Renderer or Image component as its first child. Dynamic colouring will not work.");
materialColourCanBeUsed = false;
}
}
}
int color1Id = Shader.PropertyToID("_Color1"), color2Id = Shader.PropertyToID("_Color2");
barMaterials[i].SetColor(color1Id, colorMin);
barMaterials[i].SetColor(color2Id, colorMax);
}
materialValId = Shader.PropertyToID("_Val");
highestLogFreq = Mathf.Log(barAmount + 1, 2); //gets the highest possible logged frequency, used to calculate which sample of the spectrum to use for a bar
frequencyScaleFactor = 1.0f / (AudioSettings.outputSampleRate / 2) * numSamples;
isEnabled = true;
}
