void OnAudioFilterRead(float[] data, int channels)
{
Debug.Log(data.Length);
if (SourceSignal == null)
{
return;
}
if (m_outputBuffer == null || m_outputBuffer.Length != data.Length / channels)
{
m_outputBuffer = new float[data.Length / channels];
}
var fft = new NWaves.Transforms.Dct2(m_grainSizeFFT, data.Length);
int dataLen = data.Length;
double starttime = AudioSettings.dspTime;
fft.Inverse(m_grains[grainOffset].weights, m_outputBuffer);
for (int i = 0; i < dataLen - 2; i += 2)
{
data[i] = m_outputBuffer[i / 2];
data[i + 1] = m_outputBuffer[i / 2 + 1];
}
}
private void CollectGrains()
{
m_grains = new List <FrequencyGrain>();
int numsamples = SourceSignal.Length;
int grainSizeSamples = (int)(AudioSettings.outputSampleRate * grainSizeMS / 1000f);
int numGrains = numsamples / grainSizeSamples - 1;
m_grainSizeFFT = 2;
while (m_grainSizeFFT < grainSizeSamples)
{
m_grainSizeFFT *= 2;
}
Debug.Log($"numsamples {numsamples}");
Debug.Log($"grainSizeSamples {grainSizeSamples}");
Debug.Log($"grainSizeFFT {m_grainSizeFFT}");
Debug.Log($"numGrains {numGrains}");
var fft = new NWaves.Transforms.Dct2(m_grainSizeFFT, m_grainSizeFFT);
float[] source = new float[m_grainSizeFFT];
for (int i = 0; i < numsamples - m_grainSizeFFT; i += grainSizeSamples)
{
var grain = new FrequencyGrain();
grain.Start = i;
grain.Length = grainSizeSamples;
grain.samples = new float[m_grainSizeFFT];
grain.weights = new float[m_grainSizeFFT];
for (int j = 0; j < m_grainSizeFFT; j++)
{
grain.samples[j] = SourceSignal.Samples[j + i];
}
fft.Direct(grain.samples, grain.weights);
m_grains.Add(grain);
}
}
