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more small optimisation of FFT

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minjaesong
2025-06-26 19:14:39 +09:00
parent 6bdf585b49
commit 3f787108b2
1 changed files with 10 additions and 25 deletions
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35
src/net/torvald/terrarum/audio/dsp/Convolv.kt
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@@ -14,7 +14,6 @@ import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.COL_METER_GRAD_YEL
import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.FILTER_NAME_ACTIVE
import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.STRIP_W
import net.torvald.terrarum.ui.Toolkit
import java.io.File
import kotlin.math.roundToInt
/**
@@ -63,7 +62,7 @@ class Convolv(irModule: String, irPath: String, val crossfeed: Float, gain: Floa
pushSum(gain, inbuf[0], inbuf[1], sumbuf)
pushSumCircular(gain, inbuf[0], inbuf[1], sumbuf)
convolve(sumbuf[0], convFFT[0], fftOutL)
convolve(sumbuf[1], convFFT[1], fftOutR)
@@ -80,30 +79,16 @@ class Convolv(irModule: String, irPath: String, val crossfeed: Float, gain: Floa
processingSpeed = realtime / ptime
}
private fun push(gain: Float, samples: FloatArray, buf: ComplexArray) {
// shift numbers
System.arraycopy(buf.reim, samples.size * 2, buf.reim, 0, buf.reim.size - samples.size * 2)
// fill in the shifted area
val baseI = buf.reim.size - samples.size * 2
samples.forEachIndexed { index, fl ->
buf.reim[baseI + index * 2 + 0] = fl * gain
buf.reim[baseI + index * 2 + 1] = 0f
}
}
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
for (i in sampleL.indices) {
sumbuf[0].reim[baseIdx + i * 2] = (sampleL[i] + sampleR[i] * crossfeed) * gain
sumbuf[0].reim[baseIdx + i * 2 + 1] = 0f
sumbuf[1].reim[baseIdx + i * 2] = (sampleL[i] * crossfeed + sampleR[i]) * gain
sumbuf[1].reim[baseIdx + i * 2 + 1] = 0f
}
bufferIndex = (bufferIndex + sampleL.size) % (fftLen - sampleL.size)
}
override fun drawDebugView(batch: SpriteBatch, x: Int, y: Int) {