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hopefully 'correct' binopan

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minjaesong
2024-01-11 17:46:30 +09:00
parent 5973327ed6
commit 28edba9bb3
2 changed files with 53 additions and 28 deletions
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68
src/net/torvald/terrarum/audio/dsp/BinoPan.kt
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@@ -3,6 +3,7 @@ package net.torvald.terrarum.audio.dsp
import com.badlogic.gdx.graphics.g2d.SpriteBatch
import com.jme3.math.FastMath
import net.torvald.terrarum.App
import net.torvald.terrarum.App.printdbg
import net.torvald.terrarum.audio.AudioMixer
import net.torvald.terrarum.audio.TerrarumAudioMixerTrack
import net.torvald.terrarum.audio.TerrarumAudioMixerTrack.Companion.AUDIO_BUFFER_SIZE
@@ -23,14 +24,10 @@ import kotlin.math.roundToInt
*/
class BinoPan(var pan: Float, var earDist: Float = 0.18f): TerrarumAudioFilter() {
private val PANNING_CONST = 3.0 // 3dB panning rule
private val panUp = decibelsToFullscale(PANNING_CONST / 2.0).toFloat()
private val panDn = decibelsToFullscale(-PANNING_CONST / 2.0).toFloat()
private val delayLineL = FloatArray(AUDIO_BUFFER_SIZE)
private val delayLineR = FloatArray(AUDIO_BUFFER_SIZE)
private fun getFrom(index: Float, buf0: FloatArray, buf1: FloatArray): Float {
val index = index.toInt() // TODO resampling
return if (index >= 0) buf1[index]
@@ -44,47 +41,64 @@ class BinoPan(var pan: Float, var earDist: Float = 0.18f): TerrarumAudioFilter()
private val outRs = Array(2) { FloatArray(AUDIO_BUFFER_SIZE) }
override fun thru(inbuf: List<FloatArray>, outbuf: List<FloatArray>) {
val angle = pan * 1.5707963f
companion object {
private val PANNING_CONST = 6.0
private const val L = 0
private const val R = 1
private val HALF_PI = (Math.PI / 2.0).toFloat()
}
private fun thru(sym: String, angleOffset: Float, inbuf: FloatArray, sumbuf: Array<FloatArray>, delayLine: FloatArray) {
val pan = (pan + angleOffset / 90f).coerceIn(-1f, 1f)
val angle = pan * HALF_PI
val timeDiffMax = earDist / AudioMixer.SPEED_OF_SOUND * TerrarumAudioMixerTrack.SAMPLING_RATEF
val delayInSamples = (timeDiffMax * FastMath.sin(angle)).absoluteValue
val volMultDbThis = PANNING_CONST * pan.absoluteValue
val volMultFsThis = decibelsToFullscale(volMultDbThis).toFloat()
val volMUltFsOther = 1f / volMultFsThis
val volMultFsOther = 1f / volMultFsThis
if (pan >= 0) {
delays[0] = delayInSamples
delays[1] = 0f
delays[L] = delayInSamples
delays[R] = 0f
}
else {
delays[0] = 0f
delays[1] = delayInSamples
delays[L] = 0f
delays[R] = delayInSamples
}
if (pan >= 0) {
mults[0] = volMUltFsOther
mults[1] = volMultFsThis
mults[L] = volMultFsOther
mults[R] = volMultFsThis
}
else {
mults[0] = volMultFsThis
mults[1] = volMUltFsOther
}
for (ch in 0..1) {
for (i in 0 until AUDIO_BUFFER_SIZE) {
outLs[ch][i] = getFrom(i - delays[ch], delayLineL, inbuf[0]) * mults[ch]
outRs[ch][i] = getFrom(i - delays[ch], delayLineR, inbuf[1]) * mults[ch]
}
mults[L] = volMultFsThis
mults[R] = volMultFsOther
}
for (i in 0 until AUDIO_BUFFER_SIZE) {
outbuf[0][i] = (outLs[0][i] * panUp + outLs[1][i] * panDn) / 2f
outbuf[1][i] = (outRs[0][i] * panDn + outRs[1][i] * panUp) / 2f
sumbuf[L][i] = mults[L] * getFrom(i - delays[L], delayLine, inbuf)
sumbuf[R][i] = mults[R] * getFrom(i - delays[R], delayLine, inbuf)
}
push(inbuf[0], delayLineL)
push(inbuf[1], delayLineR)
// printdbg(this, "$sym\tpan=$pan, mults=${mults[L]}\t${mults[R]}")
}
override fun thru(inbuf: List<FloatArray>, outbuf: List<FloatArray>) {
thru("L", -90f, inbuf[L], outLs, delayLineL)
thru("R", +90f, inbuf[R], outRs, delayLineR)
for (i in 0 until AUDIO_BUFFER_SIZE) {
val outL = (outLs[L][i] + outRs[L][i]) / 2f
val outR = (outLs[R][i] + outRs[R][i]) / 2f
outbuf[L][i] = outL
outbuf[R][i] = outR
}
push(inbuf[L], delayLineL)
push(inbuf[R], delayLineR)
}
override fun drawDebugView(batch: SpriteBatch, x: Int, y: Int) {