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more subtle optimisations

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This commit is contained in:
minjaesong
2023-11-28 19:43:42 +09:00
parent 6059ba92ac
commit 544024c282
2 changed files with 46 additions and 10 deletions
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18
src/net/torvald/terrarum/audio/dsp/Convolv.kt
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@@ -109,6 +109,10 @@ class Convolv(ir: File, val gain: Float = 1f / 256f): TerrarumAudioFilter() {
}
private val realtime = (BLOCKSIZE / TerrarumAudioMixerTrack.SAMPLING_RATEF * 1000000000L)
private val fftIn = ComplexArray(FloatArray(fftLen * 2))
private val fftMult = ComplexArray(FloatArray(fftLen * 2))
private val fftOut = FloatArray(fftLen)
/**
* https://thewolfsound.com/fast-convolution-fft-based-overlap-add-overlap-save-partitioned/
*/
@@ -119,10 +123,16 @@ class Convolv(ir: File, val gain: Float = 1f / 256f): TerrarumAudioFilter() {
for (ch in outbuf.indices) {
push(inbuf[ch].applyGain(gain), this.inbuf[ch])
val inputFFT = FFT.fft(this.inbuf[ch])
val Y = inputFFT * convFFT[ch]
val y = FFT.ifftAndGetReal(Y)
System.arraycopy(y, fftLen - BLOCKSIZE, outbuf[ch], 0, BLOCKSIZE)
for (i in 0 until fftLen) {
fftIn.reim[i * 2] = this.inbuf[ch][i]
fftIn.reim[i * 2 + 1] = 0f
}
FFT.fft(fftIn)
fftIn.mult(convFFT[ch], fftMult)
FFT.ifftAndGetReal(fftMult, fftOut)
System.arraycopy(fftOut, fftLen - BLOCKSIZE, outbuf[ch], 0, BLOCKSIZE)
}