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reverting FFT changes

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This commit is contained in:
minjaesong
2025-06-29 19:29:02 +09:00
parent 3f787108b2
commit f11ea557be
2 changed files with 20 additions and 6 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 {
val signal = FloatArray(signal0.size * 2) { if (it % 2 == 0) signal0[it / 2] else 0f }
ffts[signal0.size]!!.realForward(signal)
ffts[signal0.size]!!.complexForward(signal)
return ComplexArray(signal)
}
fun fft(signal0: ComplexArray) {
ffts[signal0.size]!!.realForward(signal0.reim)
ffts[signal0.size]!!.complexForward(signal0.reim)
}
fun fftInto(signal0: ComplexArray, out: ComplexArray) {
System.arraycopy(signal0.reim, 0, out.reim, 0, signal0.reim.size)
ffts[signal0.size]!!.realForward(out.reim)
ffts[signal0.size]!!.complexForward(out.reim)
}
fun ifftAndGetReal(signal0: ComplexArray): FloatArray {
ffts[signal0.size]!!.realInverse(signal0.reim, true)
ffts[signal0.size]!!.complexInverse(signal0.reim, true)
return signal0.getReal()
}
fun ifftAndGetReal(signal0: ComplexArray, output: FloatArray) {
ffts[signal0.size]!!.realInverse(signal0.reim, true)
ffts[signal0.size]!!.complexInverse(signal0.reim, true)
for (i in 0 until signal0.size) {
output[i] = signal0.reim[i * 2]
}

16
src/net/torvald/terrarum/audio/dsp/Convolv.kt
View File

@@ -62,7 +62,7 @@ class Convolv(irModule: String, irPath: String, val crossfeed: Float, gain: Floa
pushSumCircular(gain, inbuf[0], inbuf[1], sumbuf)
pushSum(gain, inbuf[0], inbuf[1], sumbuf)
convolve(sumbuf[0], convFFT[0], fftOutL)
convolve(sumbuf[1], convFFT[1], fftOutR)
@@ -79,6 +79,20 @@ class Convolv(irModule: String, irPath: String, val crossfeed: Float, gain: Floa
processingSpeed = realtime / ptime
}
private fun pushSum(gain: Float, sampleL: FloatArray, sampleR: FloatArray, sumbuf: Array<ComplexArray>) {
// shift numbers
System.arraycopy(sumbuf[0].reim, sampleL.size * 2, sumbuf[0].reim, 0, sumbuf[0].reim.size - sampleL.size * 2)
System.arraycopy(sumbuf[1].reim, sampleL.size * 2, sumbuf[1].reim, 0, sumbuf[1].reim.size - sampleL.size * 2)
// fill in the shifted area
val baseI = sumbuf[0].reim.size - sampleL.size * 2
for (index in sampleL.indices) {
sumbuf[0].reim[baseI + index * 2 + 0] = (sampleL[index] * 1.000000f + sampleR[index] * crossfeed) * gain
sumbuf[0].reim[baseI + index * 2 + 1] = 0f
sumbuf[1].reim[baseI + index * 2 + 0] = (sampleL[index] * crossfeed + sampleR[index] * 1.000000f) * gain
sumbuf[1].reim[baseI + index * 2 + 1] = 0f
}
}
private var bufferIndex = 0
private fun pushSumCircular(gain: Float, sampleL: FloatArray, sampleR: FloatArray, sumbuf: Array<ComplexArray>) {
val baseIdx = bufferIndex * 2