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slightly faster fft using inline class

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minjaesong
2023-11-27 01:04:05 +09:00
parent 33f5461453
commit 659a159697
2 changed files with 17 additions and 9 deletions
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16
src/net/torvald/terrarum/audio/FFT.kt
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@@ -10,14 +10,14 @@ import org.bytedeco.javacpp.Loader
import org.jtransforms.fft.FloatFFT_1D
import java.util.concurrent.locks.ReentrantLock
private val RE0 = 0
private val IM0 = 1
class ComplexArray(val reim: FloatArray) {
private val RE1 = -1
private val IM1 = 0
private val RE0 = 0
private val IM0 = 1
@JvmInline value class ComplexArray(val reim: FloatArray) {
private val RE1 = -1
private val IM1 = 0
val indices: IntProgression
get() = 0 until size
@@ -40,6 +40,10 @@ class ComplexArray(val reim: FloatArray) {
return ComplexArray(out)
}
fun getReal(): FloatArray {
return FloatArray(size) { reim[it * 2] }
}
}
/**
@@ -138,7 +142,7 @@ object FFT: Disposable {
val signal = signal0.reim
val fft = FloatFFT_1D(signal0.size.toLong())
fft.complexInverse(signal, true)
return FloatArray(signal0.size) { signal[it * 2] }
return signal0.getReal()
}
// org.apache.commons.math3.transform.FastFouriesTransformer.java:214