| private GetSpectrumData ( int numSamples, int channel, FFTWindow window ) : float[] | ||
| numSamples | int | |
| channel | int | |
| window | FFTWindow | |
| return | float[] | |
System.Collections.IEnumerator updateViz()
{
while (true)
{
theAudioSource.GetSpectrumData(_SpectrumLeft, 0, myFFTWindow);
updateSectrumViz(_SpectrumLeft);
yield return(new WaitForFixedUpdate());
}
}
/**
* <summary>AudioSourceの高速フーリエ変換結果を返す。</summary>
* <param name="audio">解析対象のAudioSource</param>
* <returns>周波数 -> パワー のPairのList</returns>
*/
public static List<KeyValuePair<float, float>> GetSpectrumData(AudioSource audio)
{
float[] spectrum = new float[NumSamples];
audio.GetSpectrumData(spectrum, 0, Window);
List<KeyValuePair<float, float>> result = new List<KeyValuePair<float,float>>();
for (int i = 0; i < spectrum.Length; i++)
{
float frequency = ((float)AudioSettings.outputSampleRate * i) / (2.0f * spectrum.Length);
result.Add(new KeyValuePair<float, float>(frequency, spectrum[i]));
}
return result;
}
static int GetSpectrumData(IntPtr L)
{
try
{
ToLua.CheckArgsCount(L, 4);
UnityEngine.AudioSource obj = (UnityEngine.AudioSource)ToLua.CheckObject <UnityEngine.AudioSource>(L, 1);
float[] arg0 = ToLua.CheckNumberArray <float>(L, 2);
int arg1 = (int)LuaDLL.luaL_checkinteger(L, 3);
UnityEngine.FFTWindow arg2 = (UnityEngine.FFTWindow)ToLua.CheckObject(L, 4, TypeTraits <UnityEngine.FFTWindow> .type);
obj.GetSpectrumData(arg0, arg1, arg2);
return(0);
}
catch (Exception e)
{
return(LuaDLL.toluaL_exception(L, e));
}
}
static public int GetSpectrumData(IntPtr l)
{
try {
UnityEngine.AudioSource self = (UnityEngine.AudioSource)checkSelf(l);
System.Single[] a1;
checkType(l, 2, out a1);
System.Int32 a2;
checkType(l, 3, out a2);
UnityEngine.FFTWindow a3;
checkEnum(l, 4, out a3);
self.GetSpectrumData(a1, a2, a3);
return(0);
}
catch (Exception e) {
return(error(l, e));
}
}
public const FFTWindow Window = FFTWindow.BlackmanHarris; // フーリエ変換で用いる窓関数
#endregion Fields
#region Methods
/**
* <summary>AudioSourceの再生箇所の基本周波数を返す。</summary>
* <param name="audio">解析対象のAudioSource</param>
* <returns>基本周波数</returns>
*/
public static float GetFundamentalFrequency(AudioSource audio)
{
float[] spectrum = new float[NumSamples];
audio.GetSpectrumData(spectrum, 0, Window);
// 最大パワーを見つける
int maxIndex = Utility.ArrayArgmax<float>(spectrum);
// 基本周波数の候補とするパワー閾値を算出
float threshold = (float)System.Math.Log(spectrum[maxIndex] + 1.0f) / 10.0f;
// 低い周波数から、閾値を超えるパワーを持つピーク点を求める。
// それを基本周波数とする(いろいろ問題ありそうなアルゴリズムだ)。
int fundamentalIndex = maxIndex;
for (int i = 1; i < spectrum.Length - 1; i++)
{
if (spectrum[i - 1] <= spectrum[i] && spectrum[i] >= spectrum[i + 1])
{
float power = (float)System.Math.Log(spectrum[i] + 1.0f);
if (power > threshold)
{
fundamentalIndex = i;
break;
}
}
}
float freqIndex = (float)fundamentalIndex;
if (fundamentalIndex > 0 && fundamentalIndex < spectrum.Length - 1)
{
float dr = spectrum[fundamentalIndex + 1] / spectrum[fundamentalIndex];
float dl = spectrum[fundamentalIndex - 1] / spectrum[fundamentalIndex];
freqIndex += 0.5f * (dr * dr - dl * dl);
}
return freqIndex * AudioSettings.outputSampleRate / 2.0f / spectrum.Length;
}
/// <summary>
/// Gets the audio frequency.
/// </summary>
/// <returns>The audio frequency.</returns>
/// <param name="audio">Audio.</param>
public static float GetAudioFrequency(AudioSource audio)
{
float fundamentalFrequency = 0.0f;
float[] data = new float[1024];
audio.GetSpectrumData (data, 0, FFTWindow.BlackmanHarris);
float s = 0.0f;
int i = 0;
for (int j = 1; j < data.Length; j++) {
if (s < data [j]) {
s = data [j];
i = j;
}
}
fundamentalFrequency = i * _sampleRate / data.Length;
return fundamentalFrequency;
}
// Update is called once per frame
void BuildSend()
{
theAudioSource.GetSpectrumData(_Spectrum, 0, myFFTWindow);
send_data(_Spectrum);
}
public static float[] GetSpectrum(AudioSource audio, int samples, float[] spectrumArray) {
if(spectrumArray == null || spectrumArray.Length <= 0) spectrumArray = new float[samples];
audio.GetSpectrumData (spectrumArray, 0, FFTWindow.Rectangular);
return spectrumArray;
}
void Update()
{
if (spectrum == null || data.Length != windowSize)
{
data = new float[windowSize];
spectrum = new float[windowSize];
}
if (Buffer == null || Buffer.Length != bufferSize)
{
CreateBuffer();
}
if (audioSource != null)
{
//audioSource.GetOutputData(data, 0);
//// Get Wave
int offsetSamples = (audioSource.timeSamples > data.Length) ? audioSource.timeSamples - data.Length : 0;
audioSource.clip.GetData(data, offsetSamples);
//float[] real = new float[windowSize * 2];
//float[] imaginary = new float[windowSize * 2];
//for (int i = 0; i < windowSize; i++)
// real[i] = data[i];
//for (int i = windowSize; i < windowSize * 2; i++)
// if (!Buffer.IsEmpty)
// real[i] = data[i-windowSize];
// else
// real[i] = 0;
//for (int i = 0; i < real.Length; i++)
// real[i] *= 0.5f * (1f - Mathf.Cos(i / (float)windowSize / 2f));
//MathNet.Numerics.IntegralTransforms.Fourier.Forward(real,imaginary);
//for (int i = 0; i < windowSize * .012f; i++)
//{
// spectrum[i] = (float)real[i];
//}
audioSource.GetSpectrumData(spectrum, 0, FFTWindow.Rectangular);
Peak = Mathf.Max(Peak, data.Max(x => Mathf.Abs(x)));
FPeak = Mathf.Max(FPeak, spectrum.Max());
Buffer.Insert(SampleRate, Normalize(data, Peak), Normalize(spectrum, FPeak));
bufferEvent.Invoke(Buffer);
waveformEvent.Invoke(Buffer.Data().ToArray());
spectrumEvent.Invoke(Buffer.Current.spectrum);
for (int i = 0; i < Buffer.Current.spectrum.Length; i++)
{
float val = Buffer.Current.spectrum[i] * 255;
Color color = Color.HSVToRGB(1, 1, val);
color.a = val;
texture.SetPixel(i, index, color);
}
texture.Apply();
textureEvent.Invoke(texture, index);
index = (index + 1) % Buffer.Count;
}
else
{
Debug.LogWarning("No Audio Available!");
}
}