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audioengine: channel mixing multiple sources

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minjaesong
2023-11-20 18:31:29 +09:00
parent 1b2fdf38de
commit 91a24cae55
1 changed files with 27 additions and 36 deletions
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63
src/net/torvald/terrarum/audio/MixerTrackProcessor.kt
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@@ -2,7 +2,9 @@ package net.torvald.terrarum.audio
import com.badlogic.gdx.utils.Queue
import net.torvald.reflection.forceInvoke
import org.apache.commons.math3.special.Erf.erf
import kotlin.math.absoluteValue
import kotlin.math.tanh
/**
* Created by minjaesong on 2023-11-17.
@@ -78,12 +80,6 @@ class MixerTrackProcessor(val bufferSize: Int, val rate: Int, val track: Terraru
}
}
// also fetch samples from sidechainInputs
// TODO
// combine all the inputs
// TODO this code just uses streamBuf
var samplesL0: FloatArray? = null
var samplesR0: FloatArray? = null
var samplesL1: FloatArray? = null
@@ -93,41 +89,36 @@ class MixerTrackProcessor(val bufferSize: Int, val rate: Int, val track: Terraru
// get samples and apply the fader
if (track.isMaster || track.isBus) {
// TODO combine all the inputs
track.sidechainInputs[TerrarumAudioMixerTrack.INDEX_BGM]?.let { (side, mix) ->
// combine all the inputs
samplesL0 = FloatArray(bufferSize / 4)
samplesR0 = FloatArray(bufferSize / 4)
samplesL1 = FloatArray(bufferSize / 4)
samplesR1 = FloatArray(bufferSize / 4)
val sidechains = track.sidechainInputs.filterNotNull()
// add all up
sidechains.forEach { (side, mix) ->
for (i in samplesL0!!.indices) {
samplesL0!![i] += side.processor.fout0[0][i] * (mix * track.volume).toFloat()
samplesR0!![i] += side.processor.fout0[1][i] * (mix * track.volume).toFloat()
samplesL1!![i] += side.processor.fout1[0][i] * (mix * track.volume).toFloat()
samplesR1!![i] += side.processor.fout1[1][i] * (mix * track.volume).toFloat()
}
}
// de-clip using sigmoid function
for (i in samplesL0.indices) {
samplesL0[i] = erf(samplesL0[i].toDouble()).toFloat()
samplesR0[i] = erf(samplesR0[i].toDouble()).toFloat()
samplesL1[i] = erf(samplesL1[i].toDouble()).toFloat()
samplesR1[i] = erf(samplesR1[i].toDouble()).toFloat()
}
/*track.sidechainInputs[TerrarumAudioMixerTrack.INDEX_BGM]?.let { (side, mix) ->
samplesL0 = side.processor.fout0[0].applyVolume((mix * track.volume).toFloat()) // must not applyVolumeInline
samplesR0 = side.processor.fout0[1].applyVolume((mix * track.volume).toFloat())
samplesL1 = side.processor.fout1[0].applyVolume((mix * track.volume).toFloat())
samplesR1 = side.processor.fout1[1].applyVolume((mix * track.volume).toFloat())
}
/*track.sidechainInputs[0].let {
if (it != null) {
val f0 = it.first.pcmQueue.removeFirstOrElse {
bufEmpty = true
listOf(emptyBuf, emptyBuf)
}
samplesL0 = f0[0]
samplesR0 = f0[1]
val f1 = it.first.pcmQueue.removeFirstOrElse {
bufEmpty = true
listOf(emptyBuf, emptyBuf)
}
samplesL1 = f1[0]
samplesR1 = f1[1]
}
else {
samplesL0 = emptyBuf
samplesR0 = emptyBuf
samplesL1 = emptyBuf
samplesR1 = emptyBuf
bufEmpty = true
}
}*/
}
// source channel: skip processing if there's no active input
// else if (track.getSidechains().any { it != null && !it.isBus && !it.isMaster && !it.streamPlaying } && !track.streamPlaying) {