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realFFT is somehow faster while everything else stays the same?

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minjaesong
2025-06-26 19:08:16 +09:00
parent fa56fc14bf
commit 6bdf585b49
1 changed files with 5 additions and 5 deletions
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10
src/net/torvald/terrarum/audio/FFT.kt
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@@ -92,26 +92,26 @@ object FFT: Disposable {
fun fft(signal0: FloatArray): ComplexArray { fun fft(signal0: FloatArray): ComplexArray {
val signal = FloatArray(signal0.size * 2) { if (it % 2 == 0) signal0[it / 2] else 0f } val signal = FloatArray(signal0.size * 2) { if (it % 2 == 0) signal0[it / 2] else 0f }
ffts[signal0.size]!!.complexForward(signal) ffts[signal0.size]!!.realForward(signal)
return ComplexArray(signal) return ComplexArray(signal)
} }
fun fft(signal0: ComplexArray) { fun fft(signal0: ComplexArray) {
ffts[signal0.size]!!.complexForward(signal0.reim) ffts[signal0.size]!!.realForward(signal0.reim)
} }
fun fftInto(signal0: ComplexArray, out: ComplexArray) { fun fftInto(signal0: ComplexArray, out: ComplexArray) {
System.arraycopy(signal0.reim, 0, out.reim, 0, signal0.reim.size) System.arraycopy(signal0.reim, 0, out.reim, 0, signal0.reim.size)
ffts[signal0.size]!!.complexForward(out.reim) ffts[signal0.size]!!.realForward(out.reim)
} }
fun ifftAndGetReal(signal0: ComplexArray): FloatArray { fun ifftAndGetReal(signal0: ComplexArray): FloatArray {
ffts[signal0.size]!!.complexInverse(signal0.reim, true) ffts[signal0.size]!!.realInverse(signal0.reim, true)
return signal0.getReal() return signal0.getReal()
} }
fun ifftAndGetReal(signal0: ComplexArray, output: FloatArray) { fun ifftAndGetReal(signal0: ComplexArray, output: FloatArray) {
ffts[signal0.size]!!.complexInverse(signal0.reim, true) ffts[signal0.size]!!.realInverse(signal0.reim, true)
for (i in 0 until signal0.size) { for (i in 0 until signal0.size) {
output[i] = signal0.reim[i * 2] output[i] = signal0.reim[i * 2]
} }