// Analyze the input buffer to calculate spectrum data.
public void Analyze()
{
Profiler.BeginSample("Spectrum Analyer FFT");
using (var X = TempJobMemory.New <float4>(_N / 2))
{
// Bit-reversal permutation and first DFT pass
new FirstPassJob {
I = _I, W = _W, P = _P, X = X
}.Run(_N / 2);
// 2nd and later DFT passes
for (var i = 0; i < _logN - 1; i++)
{
var T_slice = new NativeSlice <TFactor>(_T, _N / 4 * i);
new DftPassJob {
T = T_slice, X = X
}.Run(_N / 4);
}
// Postprocess (power spectrum calculation)
var O2 = _O.Reinterpret <float2>(sizeof(float));
new PostprocessJob {
X = X, O = O2, s = 2.0f / _N
}.Run(_N / 2);
}
Profiler.EndSample();
}
public void Transform(NativeArray <float> input)
{
var X = TempJobMemory.New <float4>(_N / 2);
// Bit-reversal permutation and first DFT pass
var handle = new FirstPassJob {
I = input, P = _P, X = X
}
.Schedule(_N / 2, 32);
// 2nd and later DFT passes
for (var i = 0; i < _logN - 1; i++)
{
var T_slice = new NativeSlice <TFactor>(_T, _N / 4 * i);
handle = new DftPassJob {
T = T_slice, X = X
}
.Schedule(_N / 4, 32, handle);
}
// Postprocess (power spectrum calculation)
var O2 = _O.Reinterpret <float2>(sizeof(float));
handle = new PostprocessJob {
X = X, O = O2, s = 2.0f / _N
}
.Schedule(_N / 2, 32, handle);
handle.Complete();
X.Dispose();
}
void Start()
{
using (var data = TempJobMemory.New <float>(TestData))
{
using (var ft = new NaiveDft(Width)) _dft1 = Benchmark(ft, data);
using (var ft = new BurstDft(Width)) _dft2 = Benchmark(ft, data);
using (var ft = new BurstFft(Width)) _fft = Benchmark(ft, data);
}
}
